CN109555528B - Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support - Google Patents
Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support Download PDFInfo
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- CN109555528B CN109555528B CN201811414034.XA CN201811414034A CN109555528B CN 109555528 B CN109555528 B CN 109555528B CN 201811414034 A CN201811414034 A CN 201811414034A CN 109555528 B CN109555528 B CN 109555528B
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 162
- 238000000034 method Methods 0.000 title claims abstract description 120
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- 239000004576 sand Substances 0.000 title claims abstract description 55
- 238000003325 tomography Methods 0.000 title claims abstract description 55
- 238000010276 construction Methods 0.000 claims abstract description 607
- 230000008093 supporting effect Effects 0.000 claims abstract description 301
- 230000005641 tunneling Effects 0.000 claims abstract description 54
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Structural Engineering (AREA)
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses one kind to pass through high angle against rich water richness sand tomography tunnel excavation and method for protecting support is rushed, and the same side of tunnel main tunnel is provided with detour base tunnel and drain cavern；When carrying out excavation and supporting construction to institute's construction tunnel, comprising steps of one, rear side tunnel construction sections tentatively excavate and supporting construction；Two, rear side tunnel construction sections excavation synchronous with drain cavern scupper body and supporting construction；Three, rear side tunnel construction sections, drain cavern scupper body and rear side detour base tunnel segment sync excavation and supporting construction；Four, front drain cavern body, front base tunnel section and middle part tunnel construction sections excavation and supporting construction: five, front side tunnel construction sections excavation and supporting construction.The method of the present invention step is simple, design is reasonable and easy construction, using effect are good, is excavated using three benching tunnelling methods to Tunnel, and uses the double-deck preliminary bracing structure to carry out tunneling boring supporting to Tunnel after excavating, and can ensure that later period tunnel structure is safe.
Description
Technical field
The invention belongs to technical field of tunnel construction, pass through that high angle is inverse to rush rich water richness sand tomography tunnel more particularly, to one kind
Road excavates and method for protecting support.
Background technique
Tunnel support include excavate before advance support and excavate after the completion of carry out preliminary bracing and later period supporting,
Its middle and later periods supporting is also referred to as Tunnel Second Lining.In order to guarantee that face soil body in digging process will not cave in or generate stream
Sand needs to take the ancillary measures such as advance support, grouting and reinforcing to the front soil body before excavation.Curtain-grouting is will with hydraulic or air pressure
The slurries that can be solidified are sent in defined rock-soil layer by ad hoc inlet well by the concentration of design and are filled up in Rock And Soil
Crack or hole are formed with being reinforced (or water blockoff) comprehensively to the soil body a certain range of in front of tunnel excavating area peripheral edge
Water seal curtain.Advance support (also referred to as leading pre-supporting) is to guarantee tunnel excavation face stabilizer and being ahead of for taking
A kind of ancillary measure that face excavates, it is therefore intended that the deformation of country rock is controlled, to reach the mesh for guaranteeing safety for tunnel engineering
, the mode of tunnel advanced support mainly has pipe canopy, ductule, horizontal jet grouting stake etc..
Fault belt refers to two disk relative motion of tomography, and mutual extrusion makes neighbouring catalase, formation and fault plane
Substantially parallel crushed zone, abbreviation fracture belt.At home, high angle reversed fault of the section dip angle greater than 45 ° or 30 ° is known as inverse punching
Tomography, the constructing tunnel difficulty for passing through high angle thrust is very big, and above-mentioned high angle thrust refers to that section dip angle is greater than
60 ° of thrust.Especially when locating stratum is rich water richness Flooding in Borehole, difficulty of construction is bigger.Rich water richness Flooding in Borehole is also referred to as
For rich water Flooding in Borehole, refers to and be rich in underground water in stratum and contain layer of sand, which is both water rich strata, is also rich Flooding in Borehole.
In rich water richness Flooding in Borehole, rock crushing provides more favorable condition for the preservation of underground water and enrichment, and difficulty of construction is very big,
In addition containing layer of sand in stratum, Sand easily occurs in construction, along with tomography section dip angle is greater than 60 °, easily causes calamity
Difficulty consequence, seriously affects construction safety and benefit.Thus, when being rich in underground water in Tunnel Passing tomography, rock mass is mostly broken
Consider rock to be worth doing, and the high angle rich in sandy soil, sandstone is inverse when rushing rich water richness sand tomography, existing construction risk is very big, wait open
When digging to high angle rich water thrust, under the effect of high hydraulic pressure, face easily broke-out diseases, gush the geological disasters such as sand, apply
Work risk is high, and difficulty of construction is big and construction speed is slow.Thus, it opens the inverse tunnel for rushing rich water richness sand tomography of high angle is passed through
Before digging, advance support construction is most important.
In addition, need to be opened using benching tunnelling method when passing through the inverse tunnel for rushing rich water richness sand tomography of high angle and excavating
It digs.Benching tunnelling method refers to first tunneling top section (top bar), starts to excavate lower part section after the advanced certain distance of top bar
(getting out of a predicament or an embarrassing situation, also referred to as tunnel top hole body), the construction method that up/down steps are gone forward side by side simultaneously.Wherein, three bench cut methods are (also referred to as
Three benching tunnelling methods) refer to that institute's tunneling, which is divided into the step of upper, middle and lower three, excavates.Using three benching tunnelling methods to passing through the angle of elevation
When the tunnel of degree rich water thrust is excavated, since excavated section piecemeal is more, difficulty of construction is big and construction risk is high, it is necessary to
Using reasonable excavation and method for protecting support, construction safety just can ensure that, and guarantee the construction period.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing one kind passes through the angle of elevation
Degree is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, and method and step is simple, designs reasonable and easy construction, uses effect
Fruit is good, is excavated using three benching tunnelling methods to Tunnel, and is carried out using the double-deck preliminary bracing structure to Tunnel after excavating
Tunneling boring supporting can ensure that later period tunnel structure safety.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: one kind passes through that high angle is inverse to rush rich water richness sand
Tomography tunnel excavation and method for protecting support, it is characterised in that: the tunnel main tunnel of institute's construction tunnel is divided into rear side tunnel construction sections, is located at rear side
It front side tunnel construction sections on front side of tunnel construction sections and is connected between rear side tunnel construction sections and front side tunnel construction sections and rushes rich water richness from high angle is inverse
The middle part tunnel construction sections that sand tomography passes through；The same side of institute's construction tunnel main tunnel is provided with detour base tunnel and drain cavern, the detour
Base tunnel and drain cavern are to pass through the inverse Tunnel for rushing rich water richness sand tomography of high angle from the front to the back；The detour base tunnel is rear
The detour base tunnel of formation is excavated between side tunnel construction sections and front side tunnel construction sections, the detour base tunnel and institute's construction tunnel main tunnel are laid
In in same level；The detour base tunnel is divided into rear side base tunnel section, middle part base tunnel section and front side base tunnel section from the front to the back, described
Front side base tunnel section is located on front side of the rear side base tunnel section, and the middle part base tunnel section is connected to the rear side base tunnel section and the front side
Between base tunnel section, the middle part base tunnel section is laid with institute's construction tunnel main tunnel in parallel, the rear side base tunnel section rear end and rear side
The intersection of tunnel construction sections intersection and the two is intersection after base tunnel, and the front side base tunnel section front end is intersected and two with front side tunnel construction sections
The intersection of person is the preceding intersection of base tunnel；The rear side base tunnel section is located on rear side of the tunnel construction sections of middle part；
The drain cavern includes rear side hole body and is located on front side of the body of the rear side hole and with institute's construction tunnel main tunnel in parallel
The front side hole body of laying, front side hole body be located at the upper side of institute's construction tunnel main tunnel and its be located at institute's construction tunnel main tunnel with
Between the middle part base tunnel section, rear side hole body is gradually acclivitous Tunnel body from the front to the back；Rear side hole body
Rear end is intersected with rear side tunnel construction sections and the intersection of the two is drain cavern intersection, intersection and the drain cavern after the base tunnel
Intersection is respectively positioned on middle part tunnel construction sections rear side, and the drain cavern intersection and rear side hole body intersect after being respectively positioned on the base tunnel
On rear side of mouthful；
Front side hole body is divided into rear portion hole body and on front side of the body of the rear portion hole and passes through that high angle is inverse to rush rich water richness
The front drain cavern body of sand tomography, the scupper of the rear portion hole body composition drain cavern in rear side hole body and front side hole body
Body；
The middle part base tunnel section is divided into rear portion base tunnel section and is located on front side of the rear portion base tunnel section and passes through the inverse punching of high angle
The rear portion base tunnel section composition detour of the front base tunnel section of rich water richness sand tomography, the rear side base tunnel section and the middle part base tunnel section is led
The rear side detour base tunnel section in hole；
When carrying out excavation and supporting construction to institute's construction tunnel, comprising the following steps:
Step 1: rear side tunnel construction sections tentatively excavate and supporting construction: along tunnel longitudinal extension from the front to the back to rear side
After tunnel construction sections in tunnel construction sections on rear side of the drain cavern intersection carry out excavation construction, and split digging is molding from the front to the back
Side tunnel construction sections carry out supporting；
Step 2: rear side tunnel construction sections excavation synchronous with drain cavern scupper body and supporting construction: being excavated to rear side tunnel construction sections
When at the present position of the drain cavern intersection, along tunnel longitudinal extension from the front to the back to being located at institute in rear side tunnel construction sections
It states the tunnel construction sections after drain cavern intersection and the base tunnel between intersection and carries out excavation construction, while intersecting from the drain cavern
Mouth starts to carry out excavation construction to the scupper body of drain cavern from the front to the back, and the split molding rear side tunnel construction sections of digging from the front to the back
Supporting is carried out respectively with drain cavern；
Step 3: rear side tunnel construction sections, drain cavern scupper body and rear side detour base tunnel segment sync are excavated and supporting construction: to
When rear side tunnel construction sections are excavated to after the base tunnel at the present position of intersection, along tunnel longitudinal extension from the front to the back to rear side
After tunnel construction sections in tunnel construction sections on front side of intersection after the base tunnel carry out excavation construction, and split digging is molding from the front to the back
Side tunnel construction sections carry out supporting；Meanwhile excavation construction continued to the scupper body of drain cavern, and from intersection after the base tunnel
Start to carry out excavation construction to the rear side detour base tunnel section of detour base tunnel from the front to the back, and the split molding sluicing of digging from the front to the back
Hole and detour base tunnel carry out supporting respectively；
Step 4: front drain cavern body, front base tunnel section and middle part tunnel construction sections excavate and supporting construction:
The front drain cavern body, the front base tunnel section are all the same with the length of middle part tunnel construction sections and three is in parallel cloth
If the front drain cavern body, the front base tunnel section and middle part tunnel construction sections are divided into multiple tunnel segments from the front to the back, multiple
The length of the tunnel segment is all the same；
When carrying out excavation and supporting construction to the front drain cavern body, from the front to the back to the more of the front drain cavern body
A tunnel segment carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are homogeneous
Together；
When carrying out excavation and supporting construction to the front base tunnel section, from the front to the back to the multiple of the front drain cavern body
The tunnel segment carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are homogeneous
Together；
When carrying out excavation and supporting construction to middle part tunnel construction sections, from the front to the back to multiple tunnel sections of middle part tunnel construction sections
Section carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are all the same；
The tunnel main tunnel of the middle part tunnel construction sections is from top to bottom divided into top hole body, middle part hole body and lower part hole body, described
Top hole body is divided into left side pilot tunnel and the right side pilot tunnel on the right side of the pilot tunnel of left side；
The preliminary bracing structure of the middle part tunnel construction sections is the double-deck preliminary bracing structure, the bilayer preliminary bracing structure packet
It includes spray-up, more Pin as at the beginning of one layer of injection in the concrete that the concrete on tunnel main tunnel inner wall is formed and supporting is carried out to tunnel main tunnel
And branch stands on shaped steel arch of the concrete just on the inside of spray-up, the concrete as at the beginning of one layer of injection in concrete on spray-up is formed mixes
Spray-up, more Pin carry out supporting to tunnel main tunnel to solidifying soil again and branch stands on concrete and answers the grid steel frame on the inside of spray-up and sprayed by one layer
It penetrates in spray-up in the concrete that the concrete that concrete is answered on spray-up is formed, the shaped steel arch and grid steel frame are to tunnel
Main tunnel carries out the supporting steelframe of tunneling boring supporting and the shape of the two is identical as the transverse shape of tunnel main tunnel；The coagulation
The transverse shape that native just spray-up, concrete answer spray-up in spray-up and concrete is identical as the transverse shape of tunnel main tunnel；
The structure of shaped steel arch described in more Pin is all the same and it is laid from the front to the back along tunnel longitudinal extension, type described in more Pin
Steel arch-shelf is fastenedly connected by longitudinal connection structure and is integrated；The structure of grid steel frame described in more Pin is all the same, the grid steel
The quantity of frame and the quantity of shaped steel arch are identical, are laid with grid steel frame described in a Pin on the inside of shaped steel arch described in every Pin, often
Shaped steel arch described in Pin and the grid steel frame being laid on the inside of it are laid on the same tunnel cross-section of tunnel main tunnel；More Pin institutes
It states shaped steel arch and is embedded in concrete and answer in spray-up, the thickness that the concrete answers spray-up is greater than the thickness of shaped steel arch；It is more
Grid steel frame described in Pin is embedded in concrete in spray-up, and the thickness of spray-up is greater than the thickness of grid steel frame in the concrete
Degree；For shaped steel arch described in more Pin in uniformly distributed, the spacing between shaped steel arch described in adjacent two Pin is the value range of d and d
For 0.8m~1.2m；
The first spray-up of concrete described in the bilayer preliminary bracing structure, shaped steel arch and concrete described in more Pin answer spray-up
Outer layer just branch structure is formed, grid steel frame composition described in spray-up and more Pin is located at outer layer just on the inside of branch structure in the concrete
The first branch structure of internal layer；
Shaped steel arch described in every Pin is right to the arch wall scaffold of tunnel main tunnel arch wall progress supporting and one by one
The tunnel inverted arch bracket that tunnel main tunnel bottom carries out supporting is spliced, and the tunnel inverted arch bracket is located at the arch wall supporting arch
The underface of frame and the two is located on same tunnel cross section, the tunnel inverted arch bracket and the arch wall scaffold form one
A closed tunneling boring bracket；The arch wall scaffold is by one to positioned at the intracorporal top arch in the top hole and two
The side bracket for being symmetrically laid in lower section at left and right sides of the arch of top is spliced, and two side brackets are respectively positioned on middle part hole
In vivo；The tunnel inverted arch bracket is located in the body of lower part hole, the left end of the tunnel inverted arch bracket and a side bracket
Bottom is fastenedly connected, and right end and the side bracket bottom described in another of the tunnel inverted arch bracket are fastenedly connected；The top
Left side arch of the arch by being located in the pilot tunnel of left side and the right side arch in the pilot tunnel of right side are spliced；
When carrying out excavation and supporting either one or two of the middle part tunnel construction sections tunnel segment, comprising the following steps:
Step F1, top hole body excavates and preliminary bracing, process are as follows:
Step F11, left side pilot drive and outer layer preliminary bracing: along tunnel longitudinal extension from the front to the back to current institute
The left side pilot tunnel of tunneling segment is excavated；
During the left side pilot drive, one layer of coagulation is sprayed on excavating molding left side pilot tunnel inner wall from the front to the back
Soil obtains the just spray-up of the concrete in the pilot tunnel of left side, and is excavating in molding left side pilot tunnel arch on the left of installation from the front to the back,
And left side arch branch is made to stand on concrete just spray-up inside；It is sprayed on the collateral vertical first spray-up of concrete for having left side arch inside simultaneously
It penetrates the concrete that a layer concrete obtains in the pilot tunnel of left side and answers spray-up, and so that left side arch is embedded in concrete and answer in spray-up, it is complete
At the work progress of branch structure at the beginning of the pilot tunnel ectonexine of left side；
Step F12, right side pilot drive and outer layer preliminary bracing: during left side pilot drive described in step F11, edge
Longitudinal extension synchronization in tunnel from the front to the back excavates the right side pilot tunnel to current institute's tunneling segment, is excavated
Molding top hole body；
During the right side pilot drive, one layer of coagulation is sprayed on excavating molding right side pilot tunnel inner wall from the front to the back
Soil obtains the just spray-up of the concrete in the pilot tunnel of right side, and is excavating in molding right side pilot tunnel arch on the right side of installation from the front to the back,
Arch branch is stood on the inside of the first spray-up of concrete and is fastenedly connected right side arch with left side arch and is integrated on the right side of making, and is constructed
The molding top arch；Layer concrete acquisition is sprayed on the collateral vertical first spray-up of concrete for having right side arch inside simultaneously
Concrete in the pilot tunnel of right side answers spray-up, and so that right side arch is embedded in concrete and answer in spray-up, completes in the body of the top hole
The work progress of the first branch structure of outer layer；
In this step in digging process, the face of the right side pilot tunnel is located on rear side of the face of left side pilot tunnel；
Step F2, it middle part hole body excavation and outer layer preliminary bracing: is carried out in the body digging process of top hole in step F1, along tunnel
Road longitudinal extension is being excavated below molding top hole body in current institute's tunneling segment from the front to the back
Portion hole body is excavated；
In the middle part hole body digging process, one layer of coagulation is sprayed on wall in excavation molding middle part hole body from the front to the back
Soil obtains the intracorporal concrete in middle part hole just spray-up, and installs respectively at left and right sides of excavation molding middle part hole body from the front to the back
Side bracket, make side bracket branch stand on concrete just on the inside of spray-up and make each side bracket with institute in step F12
It states top arch and is fastenedly connected and be integrated；One layer of coagulation is sprayed on the collateral first spray-up of the vertical concrete for having side bracket inside simultaneously
Soil obtains the intracorporal concrete in middle part hole and answers spray-up, and so that side bracket is embedded in concrete and answer in spray-up, completes middle part hole body
The work progress of the first branch structure of ectonexine；
Two side brackets in left and right connect composition arch wall with top arch described in step F12 in the body of the middle part hole
Arch；
In this step in digging process, the face of middle part hole body is located at the palm on right side pilot tunnel described in step F12
On rear side of sub- face；
Step F3, it lower part hole body excavation and outer layer preliminary bracing: is carried out in step F2 in the body digging process of middle part hole, along tunnel
Road longitudinal extension is being excavated below the body of molding middle part hole to the lower part hole of current institute's tunneling segment from the front to the back
Body is excavated, and is obtained and is excavated molding tunnel main tunnel；
In the lower part hole body digging process, one layer of coagulation is sprayed on wall in excavation molding lower part hole body from the front to the back
Soil obtains the intracorporal concrete in lower part hole just spray-up, and is excavating installation tunnel inverted arch branch in the body of molding lower part hole from the front to the back
Frame stands on tunnel inverted arch bracket branch on the inside of the first spray-up of concrete and makes arch wall arch described in tunnel inverted arch bracket and step F2
Connection forms shaped steel arch；A layer concrete is sprayed on the collateral first spray-up of the vertical concrete for having tunnel inverted arch bracket inside simultaneously to obtain
It obtains the intracorporal concrete in lower part hole and answers spray-up, and so that tunnel inverted arch bracket is embedded in concrete and answer in spray-up, complete tunnel main tunnel
The work progress of the first branch structure of ectonexine；
In this step in digging process, the face of lower part hole body is located at the area of the body of middle part hole described in step F2
On rear side of face；
Step F4, it internal layer preliminary bracing and two lining constructions: in step F3 in digging process, also needs constructing from the front to the back
Collateral vertical grid steel frame in the first branch structure of molding outer layer, while the collateral vertical outer layer for having grid steel frame just props up inside from the front to the back
A layer concrete is sprayed in structure and obtains spray-up in concrete, and is embedded in grid steel frame in concrete in spray-up, in completion
The work progress of branch structure at the beginning of layer obtains the double-deck preliminary bracing structure of construction molding；
During carrying out internal layer preliminary bracing in step F4, from the front to the back in the double-deck preliminary bracing of construction molding
Construction tunnel secondary lining on the inside of structure, completes the excavation and Bracing Process of the tunnel segment；
Step 5: front side tunnel construction sections excavate and supporting construction: the front side tunnel construction sections are divided into intersect before the base tunnel
Front tunnel construction sections on front side of mouthful and the rear portion tunnel construction sections on rear side of the preceding intersection of the base tunnel；
After the completion of the front base tunnel section described in the step 4 is excavated, the front side base tunnel section is excavated from the front to the back,
And the split molding detour base tunnel of digging carries out supporting from the front to the back, until completing detour base tunnel and Bracing Process；
After the completion of detour excavation with guide pit, along tunnel longitudinal extension from the front to the back to the front tunnel of front side tunnel construction sections
Duan Jinhang is excavated, and the molding front tunnel construction sections of split digging carry out supporting from the front to the back；Simultaneously along the longitudinal extension side in tunnel
It is excavated to the rear portion tunnel construction sections from the front to the back to front side tunnel construction sections, and the split molding rear portion tunnel of digging from the front to the back
Duan Jinhang supporting.
Above-mentioned high angle of passing through is against rich water richness sand tomography tunnel excavation and method for protecting support is rushed, it is characterized in that: edge in step 4
When tunnel extending direction from the front to the back excavates the front base tunnel section, the face of the detour base tunnel be located at it is described before
On rear side of the face of portion's drain cavern body；
When being excavated from the front to the back to middle part tunnel construction sections in step 4 along tunnel extending direction, the middle part tunnel construction sections
Face is located on rear side of the face of detour base tunnel.
Above-mentioned high angle of passing through is against rich water richness sand tomography tunnel excavation and method for protecting support is rushed, it is characterized in that: the tunnel is just
Tunnel main tunnel supporting construction is provided in hole, the tunnel main tunnel supporting construction includes the split molding institute's construction tunnel main tunnel of digging
The first tunnel for carrying out the first Tunnel structure of preliminary bracing and being laid on the inside of the first Tunnel structure
Secondary lining, the first Tunnel structure and the first Tunnel Second Lining are to carry out entirely to institute's construction tunnel main tunnel
The supporting construction of section supporting；The first Tunnel Second Lining in the middle part tunnel construction sections is the double-deck preliminary bracing structure,
The first Tunnel Second Lining in the middle part tunnel construction sections is Tunnel Second Lining；
Drain cavern supporting construction is provided in the drain cavern, the drain cavern supporting construction, which includes that split digging is molding, lets out
Water hole carry out preliminary bracing the second Tunnel structure and be laid on the inside of the second Tunnel structure second
Tunnel Second Lining, the second Tunnel structure and the second Tunnel Second Lining are to carry out tunneling boring to drain cavern
The supporting construction of supporting；
In step 1, when carrying out excavation construction to rear side tunnel construction sections in step 2 and step 3, along the longitudinal extension side in tunnel
Molding rear side tunnel construction sections progress supporting is dug to split from the front to the back, and obtains the tunnel main tunnel supporting construction of construction molding；
When carrying out excavation construction to the scupper body of drain cavern in step 2 and step 3, along tunnel longitudinal extension by
It is split before backward to dig molding drain cavern progress supporting, and obtain the drain cavern supporting construction of construction molding；
It is vertical along tunnel when carrying out excavation construction to each of the front drain cavern body tunnel segment in step 4
Molding drain cavern progress supporting is dug to extending direction is split from the front to the back, and obtains the drain cavern supporting construction of construction molding.
It is above-mentioned to pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, it is characterized in that: in step 2 from
Before the drain cavern intersection starts to carry out excavation construction to the scupper body of drain cavern from the front to the back, first to the drain cavern
The first Tunnel structure in region locating for intersection and the first Tunnel Second Lining carry out aperture respectively, are constructed into
The drain cavern intersection of type；
The rear side detour base tunnel section of detour base tunnel is carried out from the front to the back intersection after the base tunnel in step 3
It is first secondary to the first Tunnel structure in region locating for intersection after the base tunnel and the first tunnel before excavation construction
Lining cutting carries out aperture respectively, obtains intersection after the base tunnel of construction molding.
Above-mentioned high angle of passing through is against rich water richness sand tomography tunnel excavation and method for protecting support is rushed, it is characterized in that: the drain cavern
It is the service gallery of tunnel main tunnel with detour base tunnel, intersection, the preceding intersection of the base tunnel and the sluicing after the base tunnel
Hole intersection is service gallery hole, and the service gallery hole intersects for what service gallery intersected with institute construction tunnel main tunnel
Mouthful；
To the first Tunnel structure in region locating for the drain cavern intersection and the first Tunnel Second Lining point
Not carry out aperture boring method and to the first Tunnel structure in region locating for intersection after the base tunnel and first
The boring method that Tunnel Second Lining carries out aperture respectively is identical and both for service gallery hole aperture method；
When carrying out aperture using the service gallery hole aperture method, to first of region locating for the service gallery hole
Tunnel structure and the first Tunnel Second Lining carry out aperture respectively, and process is as follows:
Step A1, the first Tunnel Second Lining aperture: secondary to first tunnel in region locating for the service gallery hole
Lining cutting carries out aperture, obtains two lining holes；
The structure at two lining hole is identical as the structure at the service gallery hole；
Step A2, the first Tunnel structure aperture: to first tunnel in region locating for the service gallery hole
Preliminary bracing structure carries out aperture, obtains just branch hole；
The structure at the just branch hole is identical as the structure at the service gallery hole；
Step A3, hole supporting: using circumferential steel arch-shelf to just branch hole carries out supporting, the circumferential direction described in step A2
Steel arch-shelf be to it is described just branch hole carry out tunneling boring supporting support bracket and its structure with it is described at the beginning of the structure at branch hole it is identical.
Above-mentioned high angle of passing through is against rich water richness sand tomography tunnel excavation and method for protecting support is rushed, it is characterized in that: type described in every Pin
Temporary support structure is provided on the inside of steel arch-shelf, the temporary support structure is laid in tunnel with the shaped steel arch for being laid in outside
On the same cross section of main tunnel；The temporary support structure includes the interim vertical supporting being supported in below the arch right end of left side
Column and the interim inverted arch bracket being connected between left side arch bottom and interim vertical supporting column bottom, the interim vertical supporting
Column and interim inverted arch bracket are respectively positioned in the body of the top hole；
During carrying out left side pilot drive and outer layer preliminary bracing in step F11, a molding left side is being excavated from the front to the back
In the pilot tunnel of side when the arch of installation left side, interim vertical supporting column need to be also installed below the arch right end of left side, and by temporarily facing upward
Left side arch is fastenedly connected with interim vertical supporting column and is integrated by arch trestle；The left side arch and interim vertical supporting column
Bottom, which is supported in, excavates molding left side pilot tunnel bottom, and the interim inverted arch support level is supported in left side pilot tunnel bottom；
It carries out from the front to the back removing the temporary support structure in the body digging process of middle part hole in step F2.
Above-mentioned high angle of passing through is against rich water richness sand tomography tunnel excavation and method for protecting support is rushed, it is characterized in that: type described in every Pin
The anchoring system that supporting is carried out to tunnel main tunnel, the anchoring system and fashioned iron on its inside are provided on the outside of steel arch-shelf
Arch is laid on same tunnel cross section；
The anchoring system include between left side arch and right side arch on the outside of junction arch lock foot anchor tube and
Two are symmetrically laid in the locking foot anchor tube of bottom outside at left and right sides of the arch of top, the middle part outside of two side brackets
It is provided with the middle lock foot anchor tube, the bottom outside of two side brackets is provided with the lower lock foot anchor
Pipe, two middle lock foot anchor tubes are symmetrically arranged, and two lower lock foot anchor tubes are symmetrically arranged；Lock foot anchor in the arch
Pipe, locking foot anchor tube, middle lock foot anchor tube and lower lock foot anchor tube are to enter in the rock stratum of tunnel main tunnel side from the inside to the outside
Lock foot anchor tube；
During carrying out right side pilot drive and outer layer preliminary bracing in step F11, also need along tunnel longitudinal extension
It constructs in the molding left side pilot tunnel of excavation to arch lock foot anchor tube from the front to the back；
During carrying out right side pilot drive and outer layer preliminary bracing in step F12, also need along tunnel longitudinal extension
It constructs respectively in the molding top hole body of excavation to two locking foot anchor tubes from the front to the back；
Carried out in step F2 in the hole body digging process of middle part, also need along tunnel longitudinal extension from the front to the back excavate at
It constructs respectively in the middle part hole body of type to two middle lock foot anchor tubes；
In step F3 carry out lower part hole body digging process in, also need along tunnel longitudinal extension from the front to the back excavate at
It constructs respectively in the lower part hole body of type to two lower lock foot anchor tubes.
It is above-mentioned to pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, it is characterized in that: in step F1 into
Before row top hole body excavation and preliminary bracing, need first to carry out advance support to current institute's construction tunnel segment, and obtain current
The tunnel segment advance support structure of constructed segment；The abutment wall of the tunnel main tunnel is divided into upper wall body and is located at the top
Lower wall body immediately below wall；
The tunnel segment advance support structure includes that the Shed-pipe Advanced Support branch of supporting is carried out to the same tunnel segment
The longitudinal length of protection structure and per-fore pouring liquid with small pipe supporting construction, the lead pipe-shed support structure is greater than the tunnel segment
Length；
The lead pipe-shed support structure includes more and is crept into tunnel main tunnel front of tunnel heading rock stratum from the front to the back
Pipe canopy pipe and a pipe canopy leading truck that the more pipe canopy pipes are oriented to, arch of the more pipe canopy pipes along tunnel main tunnel
Contouring line is laid from left to right；Multiple pipe canopy pipe mounting holes for the installation of pipe canopy pipe are provided on the pipe canopy leading truck,
The rear end of the more pipe canopy pipes is mounted on the pipe canopy leading truck；
The per-fore pouring liquid with small pipe supporting construction includes that multiple arch walls to the same tunnel segment carry out in advance
The arch wall per-fore pouring liquid with small pipe supporting construction of supporting, multiple arch wall per-fore pouring liquid with small pipe supporting construction are in uniformly distributed
And it lays from the front to the back along tunnel longitudinal extension, the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back
The lap of splice be not more than 3m；Spacing L=n between the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back ×
D, the value range that wherein n is positive integer and n is 3~6；The abutment wall of the tunnel main tunnel is divided into upper wall body and is located on described
Lower wall body immediately below portion's wall；
Each arch wall per-fore pouring liquid with small pipe supporting construction includes a ductule leading truck, one to the tunnel
The arch per-fore pouring liquid with small pipe supporting construction of the arch progress advance support of road segment and left and right two are respectively to the tunnel
The lower wall body of abutment wall carries out the abutment wall per-fore pouring liquid with small pipe supporting construction of advance support, two sides at left and right sides of segment
Wall per-fore pouring liquid with small pipe supporting construction is symmetrically arranged, two abutment wall per-fore pouring liquid with small pipe supporting construction and the arch
Portion's per-fore pouring liquid with small pipe supporting construction is laid on the same tunnel cross section and the longitudinal length of three is all the same；Each
The arch per-fore pouring liquid with small pipe supporting construction includes more and is crept into from the front to the back to tunnel main tunnel front of tunnel heading rock stratum
Interior arch slip casting ductule, the more arch slip casting ductules carry out cloth along the arch contour line of tunnel main tunnel from left to right
If；Each abutment wall per-fore pouring liquid with small pipe supporting construction includes more and is crept into tunnel main tunnel face from the front to the back
Abutment wall slip casting ductule in square rock stratum, the lower wall body contour line of the more abutment wall slip casting ductules along tunnel main tunnel
From top to bottom laid；All abutment wall slip casting ductules and all in each arch wall per-fore pouring liquid with small pipe supporting construction
The structure snd size of arch slip casting ductule are all the same and it is laid on the same tunnel cross section of tunnel main tunnel；
The ductule leading truck is to infuse to all abutment walls in the arch wall per-fore pouring liquid with small pipe supporting construction
The leading truck that slurry ductule and all arch slip casting ductules are oriented to respectively, the ductule leading truck are preliminary bracing arch
Frame；The arch of the ductule leading truck is provided with multiple arch mounting holes for the installation of arch slip casting ductule, institute from left to right
The left and right sides lower part for stating ductule leading truck is provided with multiple side mounting holes for the installation of abutment wall slip casting ductule, the arch
The rear end of abutment wall slip casting ductule and arch slip casting ductule is mounted on same in wall per-fore pouring liquid with small pipe supporting construction
On the ductule leading truck.
It is above-mentioned to pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, it is characterized in that: in step F1 into
Before row top hole body excavation and preliminary bracing, lead pipe-shed support first is carried out to current institute's construction tunnel segment, obtains the tunnel
The lead pipe-shed support structure of road segment；
The height of top hole body and middle part hole body composition middle and upper part hole body, top hole body and lower part hole body is big
It is not more than 10m in the height of 4m, middle part hole body；
It is being excavated below molding top hole body to current institute's tunneling segment from the front to the back in step F2
When middle part hole body is excavated, multiple excavation segments is divided to excavate the middle part hole body of the tunnel segment from the front to the back；
Before excavating any one described excavation segment, advanced tubule note first is carried out to the arch wall of the excavation segment
Slurry is reinforced, and obtains the per-fore pouring liquid with small pipe supporting construction；
It is each it is described excavate segment length with the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back
Between spacing L it is identical.
Above-mentioned high angle of passing through is against rich water richness sand tomography tunnel excavation and method for protecting support is rushed, it is characterized in that: the tunnel is just
Hole is divided into hole body and the hole body under the tunnel immediately below hole body on the tunnel on tunnel, and on the tunnel cross section of hole body
For semicircle；The upper wall body of the abutment wall is located on the tunnel in the body of hole and its underpart wall is located at hole body under the tunnel
It is interior；Two abutment wall per-fore pouring liquid with small pipe supporting construction are respectively positioned on the external side in hole under the tunnel；
The region that the arch mounting hole is opened up on the ductule leading truck is arch aperture area, the arch aperture area
Shape be arc and its central angle is 120 °；
The region that pipe canopy pipe mounting hole is opened up on the pipe canopy leading truck is top aperture area, the shape of the top aperture area
Shape is arc and its central angle is 180 °.
Compared with the prior art, the present invention has the following advantages:
1, method and step is simple, design is reasonable and easy construction, input cost are lower.
2, drain cavern installation position is reasonable, and high-order drain cavern is arranged between detour base tunnel and tunnel main tunnel, steep to clastic rock
Incline it is inverse rush rich water hanging wall hydrous fluids and sufficiently drained, realize that the inverse rich water hanging wall hydrous fluids that rush of clastic rock steep dip " divide
The purpose of water decompression ", can effectively ensure construction safety, and the pre-grouting of tunnel main tunnel and detour base tunnel can also be effectively reduced
Difficulty of construction can also accelerate construction progress while ensuring construction safety, constructing tunnel quality.
3, middle part tunnel construction sections are bypassed using detour base tunnel, be located on front side of the preceding intersection of base tunnel in institute's construction tunnel main tunnel
Tunnel construction sections are constructed.It is located at what the tunnel construction sections on front side of the preceding intersection of the base tunnel were constructed in institute's construction tunnel main tunnel
Meanwhile it can synchronize to the tunnel being located at after the base tunnel between intersection and the preceding intersection of the base tunnel in institute's construction tunnel main tunnel
Duan Jinhang construction, thus construction efficiency can be effectively improved, shorten the construction period.Also, it is deposited between detour base tunnel and tunnel main tunnel
It is independent of each other in larger spacing, thus with the construction of tunnel main tunnel, and detour base tunnel work progress is easily controllable, work progress peace
Entirely, reliably.
4, using effect is good and practical value is high, increases " high-order drain cavern " using in tunnel main tunnel side, while in tunnel
The ipsilateral detour base tunnel performed of the right way formed in drainability with drain cavern it is complementary, utmostly be discharged tomography in assign water, protect
Demonstrate,prove each face construction safety.Hydraulic pressure in tomography and displacement are reduced using high-order drain cavern, created conditions for grouting and reinforcing,
Guarantee fault enhancement effect, curtain-grouting sealing operation is rapidly completed.Meanwhile using detour base tunnel is increased, new construction is provided
Work surface improves Faults in Tunnels belt construction work efficiency, effectively save duration.
5, tunnel main tunnel is excavated using three steps, four step excavating load, and construction is simple, speed of application is fast, and constructs
Journey is safe and reliable.
6, used tunnel advanced support structure is reasonable in design, easy construction, using effect are good and practical value
Barrel vault advanced support is combined with per-fore pouring liquid with small pipe supporting and integrally carries out supporting, energy to the arch in tunnel and abutment wall by height
Effectively improve Tunnel overall stability, reliability, it is ensured that construction safety, thus can reach tunneling boring curtain-grouting it is identical plus
Gu effect, but compared with tunneling boring curtain-grouting is reinforced, construction efficiency can be increased substantially, the construction period is reduced, reduces construction
Cost.
7, used lead pipe-shed support structure can carry out the upper wall body of entire tunnel segment arch and abutment wall whole
It reinforces, and is provided with the abutment wall per-fore pouring liquid with small pipe supporting knot reinforced to abutment wall lower wall body in tunnel segment rear end
Structure makes the arch of tunnel segment rear end and abutment wall can be carried out firm supporting, can effectively solve generated after by tunnel excavation
Horizontal pressure force influences the problems such as abutment wall lower part at left and right sides of the rear end of tunnel segment is easy to appear compressive deformation, sedimentation, can be to tunnel
Arch wall carries out firm supporting.
8, used per-fore pouring liquid with small pipe support structure design rationally, easy construction and using effect it is good, to tunnel
Hole arch and left and right sides abutment wall lower part carry out per-fore pouring liquid with small pipe reinforcing respectively and form a firm arch wall load-carrying ring,
The self-stable ability of hole body side rock stratum can be effectively improved, construction cost can be effectively saved, save the duration, while construction equipment letter
It is single, and preliminary bracing construction is carried out in time after tunnel construction, procedure connection is close.Also, to side in Bracing Process
The disturbance of rock stratum is small, and construction cost is lower, and can effectively solve generated horizontal pressure force after by tunnel excavation is influenced tunnel or so
Two sides abutment wall lower part is easy to appear the problems such as compressive deformation, sedimentation, and firm supporting can be carried out to tunnel arch wall.
9, used shaped steel arch simple structure and reasonable design and set up easy, construction efficiency is high, can to Tunnel into
Row tunneling boring supporting, supporting is firm, reliable, and energy simplicity is assembled when reality carries out tunnel excavation, meets Tunnel section point
Block supports demand, influences the preliminary bracing of top hole body by preliminary bracing construction in middle part hole body and lower part hole body, in
The preliminary bracing of portion hole body is not also influenced by lower part hole body preliminary bracing construction, and the initial stage of top hole body and middle part hole body
Supporting is constructed after the completion of excavation immediately, thus supporting is timely, firm, along with Tunnel is not yet opened at this time comprehensively
It digs, thus the firm performance of support of preliminary bracing structure is further guaranteed in tunnel top hole body and middle part hole body, and
The intracorporal preliminary bracing process of tunnel top hole body and middle part hole is easier to carry out, while supporting is stronger, is more advantageous to tunnel
Construction safety.
10, tunneling boring is carried out to Tunnel country rock using anchoring system to fix, further increase preliminary bracing stability.And
And anchoring system is connected as one with shaped steel arch, further increases overall stability, meanwhile, easy construction.Thus, it uses
Assembly type support bracket (i.e. shaped steel arch) is matched with the temporary support structure being dismounted easily excavates molding tunnel to benching tunnelling method
Hole carries out layering supporting, and can be carried out to large cross-section tunnel hole steady using anchoring system to integral reinforcing is carried out on the outside of Tunnel
Gu, it is ensured that construction safety.
11, the used double-deck preliminary bracing is reasonable in design and convenient, investment construction is laid in processing and fabricating and installation
Cost is relatively low.
12, the used double-deck preliminary bracing structure construction is easy, construction efficiency is higher and using effect is good, practical value
Height is able to satisfy and passes through the inverse preliminary bracing demand for rushing rich water tomography tunnel of clastic rock steep dip, with shaped steel arch support system dative
Grid steelframe support system is compared, and is had a clear superiority.Composition rigidity supporting structure is combined with grid steel frame using shaped steel arch
Preliminary bracing is carried out to Tunnel, shaped steel arch combines composition rigidity supporting structure with grid steel frame, in combination with concrete
First spray-up, concrete answer spray-up in spray-up and concrete, and shaped steel arch is embedded in concrete and answers that spray-up is interior and its branch stands on coagulation
On the inside of native just spray-up, grid steel frame is embedded in concrete in spray-up and branch is stood on concrete and answered on the inside of spray-up, passes through concrete
While first spray-up, concrete answer spray-up in spray-up and concrete and combine to rigidity supporting structure progress effective protection, can have
Effect improves the supporting intensity of rigidity supporting structure, and rigidity supporting structure is converted into the continuous support construction of longitudinal tunneling boring, really
Protect later period tunnel structure safety.Meanwhile just just branch structure was both mutually indepedent with internal layer for branch structure in outside, is independent of each other, respectively fills
The supporting role of itself is waved in distribution；Meanwhile just just branch structure complements one another branch structure outer layer again with internal layer, it can common stress deformation
Firm support is provided for Tunnel, the two mutually restricts, and outer layer just supports after branch structure plays excavation in time, and and anchoring system
Common stress together, it is ensured that Tunnel provides strong tunneling boring supporting after excavation, and just branch structure just props up outer layer to internal layer
The support action of structure is supplemented, it is ensured that the overall stability of later period Tunnel structure.
13, it excavates and method for protecting support designs reasonable, easy construction and using effect is good, three steps, four step excavating load is opened
Dig, the double-deck preliminary bracing structure of specific structure cooperated just to can ensure that the tunnel structure after excavating is firm, excavated section piecemeal compared with
It is few, difficulty of construction can be effectively reduced, and reduce construction risk.Meanwhile the design of used advanced support method is rationally, without pair
Tunnel carries out tunneling boring curtain-grouting, so as to which construction cost is greatly lowered, saves the construction period, and can ensure that construction peace
Entirely.
In conclusion the method for the present invention step is simple, design is reasonable and easy construction, using effect are good, using three steps
Method excavates Tunnel, and uses the double-deck preliminary bracing structure to carry out tunneling boring supporting to Tunnel after excavating, can be really
Protect later period tunnel structure safety.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is construction method flow diagram of the invention.
Fig. 2 is the Construction State schematic diagram before drain cavern body in front of the present invention is constructed.
Fig. 3 is the Construction State schematic diagram after the completion of drain cavern body construction in front of the present invention.
Fig. 4 is institute's construction tunnel main tunnel of the present invention, the layout position illustration of detour base tunnel and drain cavern.
Fig. 5 is the layout position illustration of grillage of the present invention.
Fig. 6 is the structural schematic diagram of first longitudinal direction steel bar connecting structure and second longitudinal direction steel bar connecting structure of the present invention.
Fig. 7 is cross-sectional configuration schematic diagram of the invention.
Fig. 8 is longitudinal plane structure schematic diagram of the invention.
Fig. 9 is the layout position illustration of pipe canopy leading truck upper tube canopy pipe mounting hole and side mounting hole of the present invention.
Figure 10 is the layout position illustration of arch mounting hole and side mounting hole on ductule leading truck of the present invention.
Figure 11 is the rear end layout position illustration of tunnel initial-stage structure upper tube canopy pipe and abutment wall slip casting ductule of the present invention.
Figure 12 is the rear end cloth of arch slip casting ductule and the abutment wall slip casting ductule in tunnel initial-stage structure of the present invention
If position view.
Figure 13 is the structural schematic diagram of shaped steel arch of the present invention and anchoring system.
Figure 14 is the structural schematic diagram of the medium-sized steel arch-shelf dative grid arch of preliminary bracing structure of the present invention.
Figure 15 is the structural schematic diagram of preliminary bracing structure and Tunnel Second Lining of the present invention.
Description of symbols:
1-detour base tunnel；1-11-left side pilot tunnel；1-12-right side pilot tunnel；
1-2-middle part hole body；1-3-lower part hole body；2-drain caverns；
3-rear side tunnel construction sections；4-front side tunnel construction sections；5-middle part tunnel construction sections；
6-high angles are inverse to rush rich water richness sand tomography；
Block wall in 10-holes；Block wall in 11-base tunnels；12-main tunnel block walls；
13-inclined shafts；14-1-the first Tunnel structure；
14-2-the second Tunnel structure；
14-3-third Tunnel structure；
The first Tunnel Second Lining of 15-1-；
The second Tunnel Second Lining of 15-2-；
15-3-third Tunnel Second Lining；21-Tunnels；
22-arch slip casting ductules；23-abutment wall slip casting ductules；
The interim vertical supporting column of 24-1-；The interim inverted arch bracket of 24-2-；
25-shaped steel archs；25-1-concrete answers spray-up；
The first spray-up of 25-2-concrete；25-3-grid steel frame；25-4-top arch；
25-41-left side arch；25-42-right side arch；
25-5-tunnel inverted arch bracket；25-6-first longitudinal direction steel bar connecting structure；
Spray-up in 25-8-concrete；25-9-side bracket；26-ductule mounting holes；
28-pipe canopy pipes；29-pipe canopy pipe mounting holes；30-concrete block walls；
31-rock stratum segment；Lock foot anchor tube in 32-arch；33-locking foot anchor tubes；
34-middle lock foot anchor tubes；35-lower lock foot anchor tubes；36-Tunnel Second Linings；
The first branch structure of 37-internal layers；The first branch structure of 38-outer layers；39-waterproof layers.
Specific embodiment
One kind as shown in Figure 1 passes through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, constructed tunnel
The tunnel main tunnel 21 in road divides for rear side tunnel construction sections 3, the front side tunnel construction sections 4 on front side of rear side tunnel construction sections 3 and is connected to rear side tunnel
Between road section 3 and front side tunnel construction sections 4 and from the inverse middle part tunnel construction sections 5 for rushing rich water richness sand tomography 6 and passing through of high angle, be detailed in Fig. 2,
Fig. 3 and Fig. 4；The same side of institute's construction tunnel main tunnel 21 is provided with detour base tunnel 1 and drain cavern 2, the detour base tunnel 1 and sluicing
Hole 2 is to pass through the inverse Tunnel for rushing rich water richness sand tomography 6 of high angle from the front to the back；The detour base tunnel 1 is in rear side tunnel
The detour base tunnel of formation is excavated between section 3 and front side tunnel construction sections 4, the detour base tunnel 1 is laid with institute's construction tunnel main tunnel 21
In in same level；The detour base tunnel 1 is divided into rear side base tunnel section, middle part base tunnel section and front side base tunnel section, institute from the front to the back
Front side base tunnel section is stated to be located on front side of the rear side base tunnel section, the middle part base tunnel section be connected to the rear side base tunnel section and it is described before
Between the base tunnel section of side, the middle part base tunnel section is laid with institute construction tunnel main tunnel 21 in parallel, the rear side base tunnel section rear end and
The intersection of the intersection of rear side tunnel construction sections 3 and the two is intersection, the front side base tunnel section front end and 4 phase of front side tunnel construction sections after base tunnel
It hands over and the intersection of the two is the preceding intersection of base tunnel；The rear side base tunnel section is located at 5 rear side of middle part tunnel construction sections；
The drain cavern 2 includes rear side hole body and is located on front side of the body of the rear side hole and with institute construction tunnel main tunnel 21 in flat
The front side hole body that row is laid, front side hole body is located at the upper side of institute's construction tunnel main tunnel 21 and it is being located at institute's construction tunnel just
Between hole 21 and the middle part base tunnel section, rear side hole body is gradually acclivitous Tunnel body from the front to the back；After described
The side rear end Dong Ti is intersected with rear side tunnel construction sections 3 and the intersection of the two is drain cavern intersection, intersection and institute after the base tunnel
It states drain cavern intersection and is respectively positioned on 5 rear side of middle part tunnel construction sections, the drain cavern intersection and rear side hole body are respectively positioned on described
After base tunnel on rear side of intersection；
Front side hole body is divided into rear portion hole body and on front side of the body of the rear portion hole and passes through that high angle is inverse to rush rich water richness
The front drain cavern body of sand tomography 6, the row of the rear portion hole body composition drain cavern 2 in rear side hole body and front side hole body
Water hole body；
The middle part base tunnel section is divided into rear portion base tunnel section and is located on front side of the rear portion base tunnel section and passes through the inverse punching of high angle
The rear portion base tunnel section of the front base tunnel section of rich water richness sand tomography 6, the rear side base tunnel section and the middle part base tunnel section forms detour
The rear side detour base tunnel section of base tunnel 1；
When carrying out excavation and supporting construction to institute's construction tunnel, comprising the following steps:
Step 1: rear side tunnel construction sections tentatively excavate and supporting construction: along tunnel longitudinal extension from the front to the back to rear side
It is located at the tunnel construction sections on rear side of the drain cavern intersection in tunnel construction sections 3 and carries out excavation construction, and split digging is molding from the front to the back
Rear side tunnel construction sections 3 carry out supporting；
Step 2: rear side tunnel construction sections excavation synchronous with drain cavern scupper body and supporting construction: being excavated to rear side tunnel construction sections 3
When at the present position of the drain cavern intersection, along tunnel longitudinal extension from the front to the back to being located in rear side tunnel construction sections 3
Tunnel construction sections behind the drain cavern intersection and the base tunnel between intersection carry out excavation construction, while handing over from the drain cavern
Prong starts to carry out excavation construction to the scupper body of drain cavern 2 from the front to the back, and the split molding rear side tunnel of digging from the front to the back
Road section 3 and drain cavern 2 carry out supporting respectively；
Step 3: rear side tunnel construction sections, drain cavern scupper body and rear side detour base tunnel segment sync are excavated and supporting construction: to
When rear side tunnel construction sections 3 are excavated to after the base tunnel at the present position of intersection, along tunnel longitudinal extension from the front to the back to rear
It is located at the tunnel construction sections after the base tunnel on front side of intersection in side tunnel construction sections 3 and carries out excavation construction, and split from the front to the back scrapes out type
Rear side tunnel construction sections 3 carry out supporting；Meanwhile excavation construction is continued to the scupper body of drain cavern 2, and after the base tunnel
Intersection starts to carry out excavation construction to the rear side detour base tunnel section of detour base tunnel 1 from the front to the back, and split from the front to the back scrapes out
The drain cavern 2 and detour base tunnel 1 of type carry out supporting respectively；
Step 4: front drain cavern body, front base tunnel section and middle part tunnel construction sections excavate and supporting construction:
The front drain cavern body, the front base tunnel section are all the same with the length of middle part tunnel construction sections 5 and three is in parallel
It lays, the front drain cavern body, the front base tunnel section and middle part tunnel construction sections 5 are divided into multiple tunnel segments from the front to the back,
The length of multiple tunnel segments is all the same；
When carrying out excavation and supporting construction to the front drain cavern body, from the front to the back to the more of the front drain cavern body
A tunnel segment carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are homogeneous
Together；
When carrying out excavation and supporting construction to the front base tunnel section, from the front to the back to the multiple of the front drain cavern body
The tunnel segment carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are homogeneous
Together；
When carrying out excavation and supporting construction to middle part tunnel construction sections 5, from the front to the back to multiple tunnels of middle part tunnel construction sections 5
Segment carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are all the same；
The tunnel main tunnel 21 of the middle part tunnel construction sections 5 is from top to bottom divided into top hole body, middle part hole body 1-2 and lower part hole body
1-3, top hole body are divided into the left side pilot tunnel 1-11 and right side pilot tunnel 1-12 on the right side of the pilot tunnel 1-11 of left side, are detailed in Fig. 7
And Figure 13；；
As shown in Figure 14, Figure 15 and Fig. 5, the preliminary bracing structure of the middle part tunnel construction sections 5 is the double-deck preliminary bracing structure,
The bilayer preliminary bracing structure includes just being sprayed by one layer of injection in the concrete that the concrete on 21 inner wall of tunnel main tunnel is formed
Layer 25-2, more Pin carry out supporting to tunnel main tunnel 21 and the shaped steel arch 25 at the beginning of branch stands on concrete on the inside of spray-up 25-2, by one
The concrete that concrete of the layer injection at the beginning of concrete on spray-up 25-2 is formed is answered spray-up 25-1, more Pin and is carried out to tunnel main tunnel 21
Supporting and branch stand on concrete and answer the grid steel frame 25-3 on the inside of spray-up 25-1 and answer spray-up 25-1 in concrete by one layer of injection
On concrete formed concrete in spray-up 25-8, the shaped steel arch 25 and grid steel frame 25-3 are to tunnel main tunnel
21 carry out tunneling boring supportings supporting steelframe and the two shape it is identical as the transverse shape of tunnel main tunnel 21；The coagulation
Native just spray-up 25-2, concrete answer cross of the transverse shape of spray-up 25-8 in spray-up 25-1 and concrete with tunnel main tunnel 21
Section configuration is identical；The structure of shaped steel arch 25 described in more Pin it is all the same and its along tunnel longitudinal extension from the front to the back into
Row is laid, and shaped steel arch 25 described in more Pin is fastenedly connected by longitudinal connection structure to be integrated；Grid steel frame 25-3 described in more Pin
Structure it is all the same, the quantity of the grid steel frame 25-3 is identical as the quantity of shaped steel arch 25, shaped steel arch 25 described in every Pin
Inside is laid with grid steel frame 25-3 described in a Pin, shaped steel arch 25 described in every Pin and the grid steel frame being laid on the inside of it
25-3 is laid on the same tunnel cross-section of tunnel main tunnel 21；Shaped steel arch 25 described in more Pin is embedded in concrete and answers spray-up
In 25-1, the thickness that the concrete answers spray-up 25-1 is greater than the thickness of shaped steel arch 25；Grid steel frame 25-3 described in more Pin is equal
It is embedded in concrete in spray-up 25-8, the thickness of spray-up 25-8 is greater than the thickness of grid steel frame 25-3 in the concrete；It is more
Shaped steel arch 25 described in Pin is in uniformly distributed, and the spacing between shaped steel arch 25 described in adjacent two Pin is d and the value range of d is
0.8m~1.2m；
Shaped steel arch 25 and concrete described in the first spray-up 25-2 of concrete, more Pin described in the bilayer preliminary bracing structure
Multiple spray-up 25-1 forms outer layer just branch structure 18, grid steel frame 25-3 composition described in spray-up 25-8 and more Pin in the concrete
Positioned at branch structure 37 at the beginning of the internal layer of 38 inside of branch structure at the beginning of outer layer；
In conjunction with Figure 13, the arch wall that shaped steel arch 25 described in every Pin carries out supporting to 21 arch wall of tunnel main tunnel by one is supported
Arch and a tunnel inverted arch bracket 25-5 for carrying out supporting to 21 bottom of tunnel main tunnel are spliced, the tunnel inverted arch bracket
25-5 is located at the underface of the arch wall scaffold and the two is located on same tunnel cross section, the tunnel inverted arch bracket
25-5 and the arch wall scaffold form a closed tunneling boring bracket；The arch wall scaffold is by one to positioned at institute
State the intracorporal top arch 25-4 in top hole and two side brackets being symmetrically laid in below at left and right sides of the arch 25-4 of top
25-9 is spliced, and two side bracket 25-9 are respectively positioned in the hole body 1-2 of middle part；25-5, the tunnel inverted arch bracket
In in the body 1-3 of lower part hole, the left end of the tunnel inverted arch bracket 25-5 is fastenedly connected with a bottom the side bracket 25-9,
The right end of the tunnel inverted arch bracket 25-5 is fastenedly connected with the bottom side bracket 25-9 described in another；The top arch
The 25-4 left side arch 25-41 by being located in the left side pilot tunnel 1-11 and right side arch 25-42 in the pilot tunnel 1-12 of right side is spelled
It connects；
When carrying out excavation and supporting either one or two of the middle part tunnel construction sections 5 tunnel segment, comprising the following steps:
Step F1, top hole body excavates and preliminary bracing, process are as follows:
Step F11, left side pilot drive and outer layer preliminary bracing: along tunnel longitudinal extension from the front to the back to current institute
The left side pilot tunnel 1-11 of tunneling segment is excavated；
In the left side pilot tunnel 1-11 digging process, sprayed on excavating molding left side pilot tunnel 1-11 inner wall from the front to the back
One layer concrete obtains the just spray-up 25-2 of the concrete in the pilot tunnel 1-11 of left side, and is excavating molding left side pilot tunnel from the front to the back
Left side arch 25-41 is installed in 1-11, and left side arch 25-41 branch is made to stand on the concrete just inside spray-up 25-2；Including simultaneously
It is sprayed on the collateral vertical first spray-up 25-2 of concrete for having left side arch 25-41 mixed in layer concrete acquisition left side pilot tunnel 1-11
The solidifying multiple spray-up 25-1 of soil, and so that left side arch 25-41 is embedded in concrete and answer in spray-up 25-1, it completes inside and outside the pilot tunnel 1-11 of left side
The work progress of branch structure 38 at the beginning of layer；
Step F12, right side pilot drive and outer layer preliminary bracing: left side pilot tunnel 1-11 digging process described in step F11
In, the right side pilot tunnel 1-12 to current institute's tunneling segment is opened from the front to the back along the synchronization of tunnel longitudinal extension
It digs, obtains and excavate molding top hole body；
In the right side pilot tunnel 1-12 digging process, sprayed on excavating molding right side pilot tunnel 1-12 inner wall from the front to the back
One layer concrete obtains the just spray-up 25-2 of the concrete in the pilot tunnel 1-12 of right side, and is excavating molding right side pilot tunnel from the front to the back
The interior installation right side arch 25-42 of 1-12, stands on right side arch 25-42 branch on the inside of the first spray-up 25-2 of concrete and encircles right side
Frame 25-42 is fastenedly connected with left side arch 25-41 and is integrated, and obtains the top arch 25-4 of construction molding；Including simultaneously
It is sprayed on the collateral vertical first spray-up 25-2 of concrete for having right side arch 25-42 mixed in layer concrete acquisition right side pilot tunnel 1-12
The solidifying multiple spray-up 25-1 of soil, and so that right side arch 25-42 is embedded in concrete and answer in spray-up 25-1, complete top hole inside and outside
The work progress of branch structure 38 at the beginning of layer；
In this step in digging process, after the face of the right side pilot tunnel 1-12 is located at the face of left side pilot tunnel 1-11
Side；
Step F2, it middle part hole body excavation and outer layer preliminary bracing: is carried out in the body digging process of top hole in step F1, along tunnel
Road longitudinal extension is being excavated below molding top hole body in current institute's tunneling segment from the front to the back
Portion hole body 1-2 is excavated；
In the middle part hole body 1-2 digging process, one is sprayed on excavating molding middle part hole body 1-2 inner wall from the front to the back
Layer concrete obtains the just spray-up 25-2 of the concrete in the hole body 1-2 of middle part, and is excavating molding middle part hole body 1-2 from the front to the back
Side bracket 25-9 is installed in the left and right sides respectively, stands on side bracket 25-9 branch on the inside of the first spray-up 25-2 of concrete and makes every
A side bracket 25-9, which is fastenedly connected with top arch 25-4 described in step F12, to be integrated；It is collateral vertical inside simultaneously
There is the concrete sprayed in layer concrete acquisition middle part hole body 1-2 on the first spray-up 25-2 of the concrete of side bracket 25-9 to spray again
Layer 25-1, and so that side bracket 25-9 is embedded in concrete and answer in spray-up 25-1, complete middle part hole body 1-2 ectonexine just branch structure
38 work progress；
Top arch 25-4 described in the side bracket 25-9 of left and right two and step F12 in the middle part hole body 1-2
Connection composition arch wall arch；
In this step in digging process, the face of the middle part hole body 1-2 is located at right side pilot tunnel described in step F12
On rear side of the face of 1-12；
Step F3, it lower part hole body excavation and outer layer preliminary bracing: is carried out in step F2 in the body digging process of middle part hole, along tunnel
Road longitudinal extension is being excavated below molding middle part hole body 1-2 to the lower part of current institute's tunneling segment from the front to the back
Hole body 1-3 is excavated, and is obtained and is excavated molding tunnel main tunnel 21；
In the lower part hole body 1-3 digging process, one is sprayed on excavating molding lower part hole body 1-3 inner wall from the front to the back
Layer concrete obtains the just spray-up 25-2 of the concrete in the body 1-3 of lower part hole, and is excavating molding lower part hole body 1-3 from the front to the back
Interior installation tunnel inverted arch bracket 25-5 stands on inverted arch bracket 25-5 branch in tunnel on the inside of the first spray-up 25-2 of concrete and makes tunnel
Inverted arch bracket 25-5 connect to form shaped steel arch 25 with arch wall arch described in step F2；Collateral stand has tunnel inverted arch inside simultaneously
The concrete that a layer concrete obtains in the body 1-3 of lower part hole, which is sprayed, on the first spray-up 25-2 of the concrete of bracket 25-5 answers spray-up 25-
1, and so that tunnel inverted arch bracket 25-5 is embedded in concrete and answer in spray-up 25-1, complete 21 ectonexine of tunnel main tunnel just branch structure 38
Work progress；
In this step in digging process, the face of the lower part hole body 1-3 is located at middle part hole body 1- described in step F2
On rear side of 2 face；
Step F4, it internal layer preliminary bracing and two lining constructions: in step F3 in digging process, also needs constructing from the front to the back
Collateral vertical grid steel frame 25-3 in the first branch structure 38 of molding outer layer, while collateral stand has grid steel frame 25-3 inside from the front to the back
Outer layer just spraying a layer concrete in branch structure 38 obtains spray-up 25-8 in concrete, and it is mixed to be embedded in grid steel frame 25-3
In solidifying soil in spray-up 25-8, the work progress of the first branch structure 37 of internal layer is completed, obtains the double-deck preliminary bracing of construction molding
Structure；
During carrying out internal layer preliminary bracing in step F4, from the front to the back in the double-deck preliminary bracing of construction molding
Construction tunnel secondary lining 36, completes the excavation and Bracing Process of the tunnel segment on the inside of structure；
Step 5: front side tunnel construction sections excavate and supporting construction: the front side tunnel construction sections 4 divide to intersect before the base tunnel
Front tunnel construction sections on front side of mouthful and the rear portion tunnel construction sections on rear side of the preceding intersection of the base tunnel；
After the completion of the front base tunnel section described in the step 4 is excavated, the front side base tunnel section is excavated from the front to the back,
And the split molding detour base tunnel 1 of digging carries out supporting from the front to the back, until completing the excavation of detour base tunnel 1 and Bracing Process；
After the completion of the excavation of detour base tunnel 1, along tunnel longitudinal extension from the front to the back to the front tunnel of front side tunnel construction sections 4
Road section is excavated, and the molding front tunnel construction sections of split digging carry out supporting from the front to the back；Longitudinally extend along tunnel simultaneously
The rear portion tunnel construction sections of front side tunnel construction sections 4 are from the front to the back excavated in direction, and the split molding rear portion of digging from the front to the back
Tunnel construction sections carry out supporting.
In the present embodiment, the length of each tunnel segment is 20m.
As shown in figure 8, the length of the tunnel segment is denoted as L1, L1=20m.
When practice of construction, according to specific needs, the length of the tunnel segment is adjusted accordingly.
In the present embodiment, during carrying out internal layer preliminary bracing in step F4, also need from the front to the back in construction molding
Construction tunnel secondary lining 36 on the inside of the bilayer preliminary bracing structure, is detailed in Fig. 8.
Just just branch structure 37 forms the double-deck preliminary bracing structure to the outer layer for branch structure 38 and internal layer.The present embodiment
In, the clear distance between shaped steel arch 25 described in every Pin and grid steel frame 25-3 on its inside is not less than 5cm.Thus, every Pin
The thickness that concrete between the shaped steel arch 25 and grid steel frame 25-3 on its inside answers spray-up 25-1 is not less than
5cm, that is to say, that the concrete answers cladding thickness of the spray-up 25-1 on shaped steel arch 25 not less than 5cm.
In the present embodiment, in the concrete spray-up 25-8 include outside concrete layer and be located at the outside concrete layer
The inside concrete layer of inside, grid steel frame 25-3 described in more Pin are both secured in the outside concrete layer；The inside is mixed
The thickness of solidifying soil layer is not less than 5cm.
The thickness of the first spray-up 25-2 of the concrete is 3cm~5cm.In the present embodiment, the layer of the first spray-up 25-2 of concrete
Thickness is 4cm.
When practice of construction, according to specific needs, spray-up 25-1 and concrete are answered to spray-up 25-2, concrete at the beginning of concrete
The thickness of interior spray-up 25-8 adjusts accordingly respectively.
In conjunction with Fig. 6, in the present embodiment, the shaped steel arch 25 is the first steelframe or the second steelframe, first steelframe with
Second steelframe is laid staggeredly and the quantity of the two is identical, is provided with a Pin between the first steelframe described in adjacent two Pin in front and back
Second steelframe；The longitudinal connection structure includes that first longitudinal direction steel bar connecting structure 25-6 with second longitudinal direction reinforcing bar connects knot
Structure 25-7；
First steelframe described in more Pin is laid from the front to the back along tunnel longitudinal extension, and the second steelframe described in more Pin is along tunnel
Road longitudinal extension is laid from the front to the back；It is laid by multiple along tunnel longitudinal extension between first steelframe described in more Pin
First longitudinal direction steel bar connecting structure 25-6 be fastenedly connected and be integrated, it is vertical along tunnel by multiple between the second steelframe described in more Pin
The second longitudinal direction steel bar connecting structure 25-7 laid to extending direction, which is fastenedly connected, to be integrated；
The first longitudinal direction steel bar connecting structure 25-6 and second longitudinal direction steel bar connecting structure 25-7 is fold-line-shaped reinforcing bar
Connection structure；The first longitudinal direction steel bar connecting structure 25-6 is spliced from back to front by more first longitudinal direction reinforcing bars, and every
The first longitudinal direction reinforcing bar is all connected between the first steelframe bracket described in adjacent two Pin in front and back；The second longitudinal direction reinforcing bar connection
Structure 25-7 is spliced from back to front by more second longitudinal direction reinforcing bars, and the every second longitudinal direction reinforcing bar is all connected to front and back phase
Between second steelframe bracket described in two Pin of neighbour.
In the present embodiment, connected between grid steel frame 25-3 described in adjacent two Pin in front and back by the longitudinally connected reinforcing bar fastening of multiple tracks
It connects, longitudinally connected reinforcing bar described in multiple tracks is laid along the outer contour of grid steel frame 25-3, and longitudinally connected reinforcing bar described in multiple tracks is in
It lays in parallel and it is laid along tunnel longitudinal extension.
As shown in figure 13, temporary support structure, the temporary support structure are provided on the inside of shaped steel arch 25 described in every Pin
It is laid on the same cross section of Tunnel 1 with the shaped steel arch 25 for being laid in outside；The temporary support structure includes branch
It supports the interim vertical supporting column 25-41 below the arch 25-41 right end of left side and is connected to the left side bottom arch 25-41 and interim
Interim inverted arch bracket 24-2 between the bottom vertical supporting column 24-1, the interim vertical supporting column 24-1 and interim inverted arch bracket
24-2 is respectively positioned in the body of the top hole；
During carrying out left side pilot drive and outer layer preliminary bracing in step F11, a molding left side is being excavated from the front to the back
In the pilot tunnel 1-11 of side when the arch 25-41 of installation left side, also interim vertical supporting column need to be installed below the arch 25-41 right end of left side
24-1, and being fastenedly connected left side arch 25-41 and interim vertical supporting column 24-1 by interim inverted arch bracket 24-2 is one
Body；The bottom of the left side arch 25-41 and interim vertical supporting column 24-1, which are supported in, excavates molding left side pilot tunnel 1-11
Bottom, the interim inverted arch bracket 24-2 are supported horizontally on the left side bottom pilot tunnel 1-11；
It carries out from the front to the back removing the temporary support structure in the body digging process of middle part hole in step F2.
During carrying out left side pilot drive and outer layer preliminary bracing in step F11, pass through the temporary support structure energy
Effectively ensure the stability of left side pilot tunnel 1-11 and top hole body.
To enhance supporting effect, the anchoring that supporting is carried out to Tunnel 1 is provided on the outside of shaped steel arch 25 described in every Pin
System, the anchoring system and shaped steel arch 25 on its inside are laid on same tunnel cross section；
The anchoring system includes the arch between left side arch 25-41 and right side arch 25-42 on the outside of junction
Lock foot anchor tube 32 and two symmetrical locking foot anchor tubes 33 for being laid in bottom outside at left and right sides of the arch 25-4 of top, described in two
The middle lock foot anchor tube 34, the bottom of two side bracket 25-9 are provided on the outside of the middle part of side bracket 25-9
Outside is provided with the lower lock foot anchor tube 35, and two middle lock foot anchor tubes 34 are symmetrically arranged, two lower locks
Foot anchor tube 35 is symmetrically arranged；The arch lock foot anchor tube 32, locking foot anchor tube 33, middle lock foot anchor tube 34 and lower lock foot anchor tube 35
It is the lock foot anchor tube entered in the 1 side rock stratum of Tunnel from the inside to the outside；
During carrying out right side pilot drive and outer layer preliminary bracing in step F11, also need along tunnel longitudinal extension
It constructs in the molding left side pilot tunnel 1-11 of excavation to arch lock foot anchor tube 32 from the front to the back；
During carrying out right side pilot drive and outer layer preliminary bracing in step F12, also need along tunnel longitudinal extension
It constructs respectively in the molding top hole body of excavation to two locking foot anchor tubes 33 from the front to the back；
Carried out in step F2 in the hole body digging process of middle part, also need along tunnel longitudinal extension from the front to the back excavate at
It constructs respectively in the middle part hole body 1-2 of type to two middle lock foot anchor tubes 34；
In step F3 carry out lower part hole body digging process in, also need along tunnel longitudinal extension from the front to the back excavate at
It constructs respectively in the lower part hole body 1-3 of type to two lower lock foot anchor tubes 35.
In the present embodiment, the area of section of the Tunnel 1 is greater than 100m2.Top hole body, middle part hole body 1-2 and
The height of lower part hole body 1-3 is all larger than 3m.The Tunnel 1 is located at that high angle is inverse to rush in rich water richness sand tomography.
Stability is anchored to improve, foot anchor tube 32, each locking foot anchor tube 33, each middle lock are locked in the arch
It is in the parallel lock foot anchor tube laid that foot anchor tube 34, which includes two with each lower lock foot anchor tube 35,.
When actual installation, the arch lock foot anchor tube 32, locking foot anchor tube 33, middle lock foot anchor tube 34 and lower lock foot anchor tube 35
Inner end pass through anchor tube connecting plate and be fixed on the assembly type support bracket, the anchor tube connecting plate is fixed on the assembly type
On support bracket, thus connect easy, reliable；The arch lock foot anchor tube 32, locking foot anchor tube 33, middle lock foot anchor tube 34 and lower lock
The length of foot anchor tube 35 is not less than 5m.
In the present embodiment, the length of the lock foot anchor tube is 5m, outer diameter is φ 50mm and its wall thickness is 6mm.Meanwhile in institute
It states in lock foot anchor tube and injects mortar, the stability of Tunnel can be effectively ensured.
When practice of construction, according to specific needs, length, outer diameter and the wall thickness of the lock foot anchor tube are accordingly adjusted respectively
It is whole.
In the present embodiment, arch lock foot anchor tube 32 is gradually tilted to the right from the inside to the outside, the locking foot anchor tube 33, in
Lock foot anchor tube 34 and lower lock foot anchor tube 35 tilt gradually downward from the inside to the outside.
Before carrying out top hole body excavation and preliminary bracing in the present embodiment, in step F1, need first to current constructed tunnel
Road segment carries out advance support, and obtains the tunnel segment advance support structure of current constructed segment；The side of the Tunnel 1
Wall is divided into upper wall body and the lower wall body immediately below the upper wall body；
As shown in Fig. 8, Figure 11 and Figure 12, the tunnel segment advance support structure includes to the same tunnel segment
Carry out the lead pipe-shed support structure and per-fore pouring liquid with small pipe supporting construction of supporting, the longitudinal direction of the lead pipe-shed support structure
Length is greater than the length of the tunnel segment；
In conjunction with Fig. 9, the lead pipe-shed support structure includes more and is crept into from the front to the back to 1 front of tunnel heading rock of Tunnel
Pipe canopy pipe 28 and a pipe canopy leading truck that the more pipe canopy pipes 28 are oriented in layer, more 28 edges of pipe canopy pipe
The arch contour line of Tunnel 1 is laid from left to right；Be provided on the pipe canopy leading truck it is multiple for pipe canopy pipe 28 install
The rear end of pipe canopy pipe mounting hole 29, the more pipe canopy pipes 28 is mounted on the pipe canopy leading truck；
In conjunction with Figure 10, the per-fore pouring liquid with small pipe supporting construction includes multiple arch walls to the same tunnel segment
The arch wall per-fore pouring liquid with small pipe supporting construction of advance support is carried out, multiple arch wall per-fore pouring liquid with small pipe supporting construction are in
It is uniformly distributed and it lays from the front to the back along tunnel longitudinal extension, the two neighboring arch wall per-fore pouring liquid with small pipe in front and back
The lap of splice of supporting construction is not more than 3m；Between between the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back
Away from L=n × d, the value range that wherein n is positive integer and n is 3~6；The abutment wall of the Tunnel 1 is divided into upper wall body and position
Lower wall body immediately below the upper wall body；
Each arch wall per-fore pouring liquid with small pipe supporting construction includes a ductule leading truck, one to the tunnel
The arch per-fore pouring liquid with small pipe supporting construction of the arch progress advance support of road segment and left and right two are respectively to the tunnel
The lower wall body of abutment wall carries out the abutment wall per-fore pouring liquid with small pipe supporting construction of advance support, two sides at left and right sides of segment
Wall per-fore pouring liquid with small pipe supporting construction is symmetrically arranged, two abutment wall per-fore pouring liquid with small pipe supporting construction and the arch
Portion's per-fore pouring liquid with small pipe supporting construction is laid on the same tunnel cross section and the longitudinal length of three is all the same；Each
The arch per-fore pouring liquid with small pipe supporting construction includes more and is crept into 1 front of tunnel heading rock stratum of Tunnel from the front to the back
Arch slip casting ductule 22, the more arch slip casting ductules 22 carry out from left to right along the arch contour line of Tunnel 1
It lays；Each abutment wall per-fore pouring liquid with small pipe supporting construction includes more and is crept into from the front to the back to 1 face of Tunnel
Abutment wall slip casting ductule 23 in the rock stratum of front, the lower wall body of the more abutment wall slip casting ductules 23 along Tunnel 1
Contour line is from top to bottom laid；All abutment wall slip casting ductules in each arch wall per-fore pouring liquid with small pipe supporting construction
23 and all arch slip casting ductules 22 structure snd size it is all the same and its same tunnel for being laid in Tunnel 1 is cross-section
On face；
The ductule leading truck is to infuse to all abutment walls in the arch wall per-fore pouring liquid with small pipe supporting construction
The leading truck that slurry ductule 23 and all arch slip casting ductules 22 are oriented to respectively, the ductule leading truck are initial stage branch
Protect arch 25；The arch of the ductule leading truck is provided with multiple arch installed for arch slip casting ductule 22 from left to right
Mounting hole, the left and right sides lower part of the ductule leading truck are provided with multiple sides installed for abutment wall slip casting ductule 23
Mounting hole, in the arch wall per-fore pouring liquid with small pipe supporting construction after abutment wall slip casting ductule 23 and arch slip casting ductule 22
End is mounted on the same ductule leading truck.
Before carrying out top hole body excavation and preliminary bracing in the present embodiment, in step F1, first to current institute's construction tunnel
Segment carries out lead pipe-shed support, obtains the lead pipe-shed support structure of the tunnel segment；
Top hole body and middle part hole body 1-2 form middle and upper part hole body, the height of top hole body and lower part hole body 3
It is all larger than 4m, the height of the middle part hole body 1-2 is not more than 10m；
It is being excavated below molding top hole body to current institute's tunneling segment from the front to the back in step F2
When middle part hole body 1-2 is excavated, multiple excavation segments is divided to open the middle part hole body 1-2 of the tunnel segment from the front to the back
It digs；
Before excavating any one described excavation segment, advanced tubule note first is carried out to the arch wall of the excavation segment
Slurry is reinforced, and obtains the per-fore pouring liquid with small pipe supporting construction；
It is each it is described excavate segment length with the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back
Between spacing L it is identical.
In the present embodiment, the height of the middle part hole body 1-2 is not less than 8m, thus the height of middle part hole body 1-2 is larger.Cause
And it is divided to upper and lower two steps to excavate middle part hole body 1-2.Also, middle part hole body 1-2 carries out advanced immediately after the completion of excavating
Grouting with small pipe is reinforced, and the supporting construction of tunnel arch wall is very firm at this time, thus to institute in the body 1-2 digging process of middle part hole
It states temporary support structure and remove and tunnel structure will not be impacted.
Each lead pipe-shed support structure is that the supporting construction of advance support is carried out to a tunnel segment.
In the present embodiment, shaped steel arch 25 described in more Pin in uniformly distributed, the spacing between shaped steel arch 25 described in adjacent two Pin be d and
The value range of d is 0.8m~1.2m, the spacing L between the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back
=n × d, wherein n is positive integer and n=3~6.
In the present embodiment, n=5.
When practice of construction, according to specific needs, the value size of n is adjusted accordingly.
In the present embodiment, the lap of splice between the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back is not
Greater than 3m and the lap of splice between the two is not less than 0.5m.
In the present embodiment, d=1m.When practice of construction, according to specific needs, the value size of d is adjusted accordingly.
In the present embodiment, the pipe canopy leading truck is shaped steel arch 25.Also, the pipe canopy leading truck is described to be supported in
The shaped steel arch 25 of one of tunnel segment rear end.
In the present embodiment, each tunnel segment rear end is also set up there are two respectively to a left side for tunnel segment rear end
Right two sides lower wall body carries out the rear end per-fore pouring liquid with small pipe supporting construction of supporting, two rear end per-fore pouring liquid with small pipe
Supporting construction is symmetrically arranged,
In the present embodiment, the outer diameter of the pipe canopy pipe 28 is φ 108mm and its wall thickness is 6mm.
Also, the circumferential spacing on the pipe canopy leading truck between the two neighboring pipe canopy pipe mounting hole 29 be 18cm~
22cm；The outer limb of the pipe canopy pipe 28 is not less than 11 °.
In the present embodiment, the circumferential spacing on the pipe canopy leading truck between the two neighboring pipe canopy pipe mounting hole 29 is
20cm；The outer limb of the pipe canopy pipe 28 is 8 °.
When practice of construction, according to specific needs, to the pipe canopy pipe mounting hole two neighboring on the pipe canopy leading truck
The outer limb of circumferential spacing and pipe canopy pipe 28 between 29 adjusts accordingly.
The pipe canopy pipe 28 is steel floral tube, multiple round injected holes are provided on the steel floral tube and its aperture be φ 10mm~
φ 16mm, multiple round injected holes in uniformly distributed and it is in quincunx laying, the two neighboring round injected hole it
Between spacing be 12cm~18cm.In the present embodiment, the spacing between the two neighboring round injected hole is 15cm.It is practical
When construction, according to specific needs, the spacing between the two neighboring round injected hole is adjusted accordingly.
In the present embodiment, the longitudinal length of each arch wall per-fore pouring liquid with small pipe supporting construction is 3m.Actually apply
Working hour according to specific needs accordingly adjusts the longitudinal length of each arch wall per-fore pouring liquid with small pipe supporting construction
It is whole.
In each arch per-fore pouring liquid with small pipe supporting construction between adjacent two arch slip casting ductules 22
Circumferential spacing be 28cm~32cm, adjacent two abutment wall notes in each abutment wall per-fore pouring liquid with small pipe supporting construction
Starching the circumferential spacing between ductule 23 is 18cm~22cm.In the present embodiment, each arch per-fore pouring liquid with small pipe branch
Circumferential spacing in protection structure between adjacent two arch slip casting ductules 22 is 30cm, and each abutment wall is small in advance to lead
Circumferential spacing in pipe grouting support structure between adjacent two abutment wall slip casting ductules 23 is 20cm.When practice of construction,
According to specific needs, between the adjacent two arch slip casting ductules 22 circumferential spacing and adjacent two sides
Circumferential spacing between wall slip casting ductule 23 adjusts accordingly.
When practice of construction, the arch slip casting ductule 22 and the abutment wall slip casting ductule 23, which are that pre-grouting is small, is led
Pipe, the outer limb of the grouting small pilot pipe are 5 °~10 °；The length of the grouting small pilot pipe be 4.5m~5.5m,
Outer diameter is φ 45mm~φ 55mm and its wall thickness is 5mm~7mm；
The grouting small pilot pipe includes tube body and the drill bit for being coaxially mounted to the tube body front end, and the drill bit is circle
Taper bit, the tube body is seamless steel pipe and its outboard sidewalls is smooth side wall, and multiple injected holes are provided on the tube body,
Multiple injected holes are communicated with the tubular body；The aperture of multiple injected holes is all the same and its aperture is φ 8mm
~φ 12mm, multiple injected holes in uniformly distributed and it is in quincunx laying, between the two neighboring injected hole between
Away from for 12cm~18cm.
In the present embodiment, the length of the grouting small pilot pipe is 5m, outer diameter is φ 50mm and its wall thickness is 6mm；Institute
The aperture for stating injected hole is φ 10mm, and the spacing between the two neighboring injected hole is 10cm.It, can be according to tool when practice of construction
Body needs, and the aperture of size and the injected hole to the grouting small pilot pipe and laying spacing are accordingly adjusted respectively
It is whole.
Wherein, circumferential spacing refers to the camber line distance of the point-to-point transmission on rounded or elliptic cross-section.According to this field
Common knowledge, the circumferential spacing on the pipe canopy leading truck between the two neighboring pipe canopy pipe mounting hole 29 are that the pipe canopy is led
Arc distance on frame between the two neighboring pipe canopy pipe mounting hole 29, adjacent two arch slip casting ductules 22 it
Between circumferential spacing refer to the camber line on the ductule leading truck between adjacent two arch slip casting ductules 22 away from
From the circumferential spacing between adjacent two abutment wall slip casting ductules 23 refers on the ductule leading truck adjacent two
Camber line distance between the abutment wall slip casting ductule 23.
In the present embodiment, each arch wall per-fore pouring liquid with small pipe supporting construction further includes one small in advance to the arch wall
What all abutment wall slip casting ductules 23 and all arch slip casting ductules 22 in conduit grouting support structure were supported respectively
Ductule support frame；
The ductule support frame is shaped steel arch 25, and each ductule support frame is described small to lead positioned at one
Pipe leading truck front and the shaped steel arch 25 adjacent with the ductule leading truck；
All abutment wall slip casting ductules 23 and all arch slip castings are small in the arch wall per-fore pouring liquid with small pipe supporting construction
The rear portion of conduit 22 is supported on the ductule support frame.
It in actual use, can be to abutment wall slip casting ductule 23 by the ductule leading truck and the ductule support frame
It is effectively oriented to, and can be provided for abutment wall slip casting ductule 23 and arch slip casting ductule 22 with arch slip casting ductule 22
Firm support, while construction efficiency can be increased substantially, it is ensured that construction quality.
In conjunction with Figure 11, Figure 12, the Tunnel 1 divides for hole body on tunnel and the tunnel immediately below hole body on the tunnel
Hole body under road, the cross section of hole body is semicircle on the tunnel；The upper wall body of the abutment wall is located at hole body on the tunnel
Interior and its underpart wall is located under the tunnel in the body of hole；Two abutment wall per-fore pouring liquid with small pipe supporting construction are respectively positioned on institute
State the external side in hole under tunnel.
In the present embodiment, as shown in Figure 10, Figure 12, the region of the arch mounting hole is opened up on the ductule leading truck
For arch aperture area, the shape of the arch aperture area is arc and its central angle is 120 °.
Thus, the range that applies of each arch per-fore pouring liquid with small pipe supporting construction is 120 ° of Tunnel arch range
It is interior, effective support can be carried out to Tunnel 1.
In the present embodiment, the arch slip casting ductule 22 and the abutment wall slip casting ductule 23, which are that pre-grouting is small, is led
Pipe, the ductule leading truck are provided with multiple ductule mounting holes 26 for grouting small pilot pipe installation.
In the present embodiment, as shown in Fig. 9, Figure 11, the region that pipe canopy pipe mounting hole 29 is opened up on the pipe canopy leading truck is
Top aperture area, the shape of the top aperture area is arc and its central angle is 180 °.
As shown in Fig. 9, Figure 11, for the supporting stability for ensuring each tunnel segment rear end, each tunnel section
Section advance support structure further includes that left and right two surpasses the lower wall body to abutment wall at left and right sides of the rear end of the tunnel segment
The abutment wall per-fore pouring liquid with small pipe supporting construction of preceding supporting, two abutment wall per-fore pouring liquid with small pipe supporting construction are in pair
Claim to lay and the two is laid on the same tunnel cross section.Correspondingly, at left and right sides of the lower part of the pipe canopy leading truck respectively
It is provided with multiple side mounting holes installed for abutment wall slip casting ductule 23 in the abutment wall per-fore pouring liquid with small pipe supporting construction.
At this point, the structure snd size of the abutment wall per-fore pouring liquid with small pipe supporting construction with the arch wall per-fore pouring liquid with small pipe supporting
The structure snd size of the supporting construction of abutment wall per-fore pouring liquid with small pipe described in structure are identical.
In the present embodiment, shaped steel arch 25 described in every Pin is carried out the arch wall branch of supporting by an arch wall to Tunnel 1
Support arch and a tunnel inverted arch bracket for carrying out supporting to 1 bottom of Tunnel are spliced, and the tunnel inverted arch bracket is located at
The underface of the arch wall scaffold and the two is located on same tunnel cross section, the tunnel inverted arch bracket and the arch wall
Scaffold forms a closed tunneling boring bracket；The left end of the tunnel inverted arch bracket is fixed on the arch wall scaffold
Left bottom inner sidewall on, the right end of the tunnel inverted arch bracket is fixed on the inside of the bottom right side of the arch wall scaffold
On wall, fixation position of the left and right ends of the tunnel inverted arch bracket on the arch wall scaffold is that inverted arch bracket is fixed
Position.The abutment wall per-fore pouring liquid with small pipe supporting construction is located above the fixed position of the inverted arch bracket.
Since the side wall bottom of the Tunnel 1 is provided with lock foot anchor tube, while 1 side wall bottom of the Tunnel is described
The fixed position of the inverted arch bracket of arch wall scaffold, support strength at this time can be effectively ensured, thus the abutment wall is advanced
Grouting with small pipe supporting construction is located above the fixed position of the inverted arch bracket, can save construction cost, also ensure that
Supporting effect.
In the present embodiment, the shaped steel arch 25 is the arch support being formed by bending by an I-steel, the abutment wall note
The rear portion of slurry ductule 23 and arch slip casting ductule 22 is supported on the upper flange of the ductule support frame；The arch
Mounting hole and the side mounting hole are respectively positioned on the web of the ductule leading truck.
In the present embodiment, the arch mounting hole and the side mounting hole are ductule mounting hole 26.
Also, the pipe canopy pipe mounting hole 29 is on the web of the pipe canopy leading truck, while the pipe canopy leading truck
Ductule mounting hole 26 is also provided on web.
For easy construction, one is mounted on to super on each ductule mounting hole 26 on the ductule leading truck
The orifice tube that preceding slip casting ductule is oriented to, every grouting small pilot pipe, which is coaxially installed on, is oriented to it
In the orifice tube.In the present embodiment, the length of the orifice tube is not less than 0.5m.
Also, one is mounted on to pipe canopy pipe 28 on each pipe canopy pipe mounting hole 29 on the pipe canopy leading truck
The orifice tube being oriented to, and one is mounted on to super on each ductule mounting hole 26 on the pipe canopy leading truck
The orifice tube that preceding slip casting ductule is oriented to.
The longitudinal length of the lead pipe-shed support structure is 25m~26m.In the present embodiment, the lead pipe-shed support
The longitudinal length of structure is 25m, and the longitudinal length of the lead pipe-shed support structure is denoted as L2, L2=25m.When practice of construction,
According to specific needs, the value size of L1 and L2 is adjusted accordingly respectively.
In the present embodiment, as shown in figure 8, before carrying out lead pipe-shed support any one described tunnel segment, first at this
Wall for grouting is set on rear side of tunnel segment.Wherein, before constructing to a tunnel segment for being located at last side, first at this
The rear side of tunnel segment constructs a concrete block wall 30 as wall for grouting；After the completion of a tunnel segment is excavated,
Next tunnel segment rear end is located at the rock stratum segment on the inside of the lead pipe-shed support structure of the upper one tunnel segment
31 be reserved wall for grouting.Meanwhile waterproof layer 39 is laid between the double-deck preliminary bracing structure and Tunnel Second Lining 36.
The concrete block wall 30 and rock stratum segment 31 are main tunnel block wall 12.
When practice of construction, according to formulaIt is calculated described double-deck first
Vertical spacing h of the neutral axis of phase supporting construction to contact surface between the first branch structure 38 of outer layer and the first branch structure 37 of internal layer0, in formula
B represents unit length and b=1m, y are integration variable and y is indicated in the middle part of the double-deck preliminary bracing structure in the position of vertical direction
It moves, h1For the thickness of branch structure 38 at the beginning of outer layer and its unit is m, h2For the thickness of branch structure 37 at the beginning of internal layer and its unit is m, E1
For the elasticity modulus of branch structure 38 at the beginning of outer layer and its unit is Pa, E2For the elasticity modulus of branch structure 37 at the beginning of internal layer and its unit is
Pa, ρ are the thickness of the double-deck preliminary bracing structure.According to the maximum allowable deflection of branch structure 38 at the beginning of the outer layer being pre-designed
ε1, and combine identified h0, obtain the maximum allowable deflection ε of the first branch structure 37 of internal layer2≥(h0-ε1)。
Wherein, the detour base tunnel 1 is laid in same level with tunnel main tunnel 21 refers to: the detour base tunnel 1
Maximum excavation width at be laid in same level at the maximum excavation width of tunnel main tunnel 21.Front side hole body with
Clear distance between tunnel main tunnel 21 is 5m~10m.In the present embodiment, the clear distance between front side hole body and tunnel main tunnel 21 is
7m.It is according to specific needs, corresponding to the clear distance progress between front side hole body and tunnel main tunnel 21 to adjust when practice of construction
It is whole.Wherein, the clear distance between front side hole body and tunnel main tunnel 21 refers to the front side hole body bottom and tunnel main tunnel 21
Vertical spacing between top, the front side hole body bottom are located at the upper side at 21 top of tunnel main tunnel.
In the present embodiment, as shown in Fig. 2, a hole is arranged in each tunnel segment rear end in the front drain cavern body
Interior block wall 10, in the hole block wall 10 and the perpendicular laying of front side hole body and its to be sealed to front side hole body
Stifled vertical block wall；
In the present embodiment, the front end face of the front base tunnel section, the front drain cavern body and the middle part tunnel construction sections 5 is equal
It is in the same plane.
To before any one described tunnel segment carries out advance support in the front drain cavern body, it is both needed in the tunnel section
Duan Houduan constructs block wall 10 in hole, in the hole constructed block wall 10 be located at the tunnel segment face rear side and itself and this
The face of tunnel segment abuts.
In the present embodiment, the middle part tunnel construction sections 5 are respectively multiple main tunnel sections along tunnel longitudinal extension from the front to the back
Section, the length of each main tunnel segment are identical as the length of the tunnel segment；
As shown in Fig. 2, the rear end of each tunnel segment (also referred to as base tunnel segment) is all provided in the front base tunnel section
Block wall 11 in a base tunnel is set, block wall 11 is with the perpendicular laying of the front base tunnel section in the base tunnel and it is to described
The vertical block wall that front base tunnel section is blocked.
Before carrying out advance support any one described base tunnel segment, it is both needed to seal in base tunnel segment rear end construction base tunnel
Wall 11, block wall 11 is located on rear side of the face of the base tunnel segment and the area of itself and the base tunnel segment in the base tunnel constructed
Face abuts.
3 front of rear side tunnel construction sections is provided with main tunnel block wall 12, the main tunnel block wall 12 and rear side tunnel construction sections 3
It is perpendicular laying and its be the vertical block wall that rear side tunnel construction sections 3 are blocked；The main tunnel block wall 12 and tunnel main tunnel
The inverse rear end face for rushing rich water richness sand tomography 6 of high angle abuts in 21, in the hole in block wall 10 and base tunnel block wall 11 with
Main tunnel block wall 12 is laid in parallel.
Block wall 10 is block wall in the hole of rear end in the hole of the last one tunnel segment rear end in the body of the front side hole,
Block wall 11 is rear end base tunnel block wall in the base tunnel of the last one base tunnel segment rear end of front base tunnel section, after described
Block wall and the rear end base tunnel block wall are laid on same vertical plane and after the two is respectively positioned on main tunnel block wall 12 in the hole of end
Side, the clear distance in the rear end hole between block wall and main tunnel block wall 12 are 2m~5m.Wherein, block wall in the rear end hole
Clear distance between main tunnel block wall 12 refers to the rear side of the front side wall of block wall and main tunnel block wall 12 in the rear end hole
Horizontal space between wall.
In the present embodiment, block wall 10 in the hole, in base tunnel block wall 11 and main tunnel block wall 12 be with a thickness of
The concrete walls of 20cm.When practice of construction, according to specific needs, to block wall 11 and main tunnel in block wall 10 in hole, base tunnel
The wall thickness of block wall 12 adjusts accordingly respectively.
In the present embodiment, the front end face and institute's construction tunnel main tunnel (21) interior high angle of front side hole body are inverse to rush rich water richness
The front end face of sand tomography 6 is located on same vertical plane.
To improve speed of application, and to ensure construction safety, intersection and 5 rear end face of middle part tunnel construction sections after the base tunnel
Between spacing be 50m~100m.Spacing between 5 rear end face of the drain cavern intersection and middle part tunnel construction sections be 120m~
180m.Spacing between the preceding intersection of the base tunnel and 5 front end face of middle part tunnel construction sections is 20m~60m.It is described in the present embodiment
Spacing after base tunnel between 5 rear end face of intersection and middle part tunnel construction sections is 70m, the drain cavern intersection and middle part tunnel construction sections 5
Spacing between rear end face is 150m, and the spacing between the preceding intersection of the base tunnel and 5 front end face of middle part tunnel construction sections is 40m.Its
In, the rear end face of middle part tunnel construction sections 5 is the front end face of main tunnel block wall 12, and the front end face of middle part tunnel construction sections 5 is institute's construction tunnel
The inverse front end face for rushing rich water richness sand tomography 6 of high angle in main tunnel 21.
When practice of construction, according to specific needs, between 5 rear end face of intersection after the base tunnel and middle part tunnel construction sections
Spacing and the preceding intersection of base tunnel and middle part tunnel between 5 rear end face of spacing, the drain cavern intersection and middle part tunnel construction sections
Spacing between 5 front end faces of section adjusts accordingly respectively.
To ensure construction safety, block wall 10 is located in drain cavern 2 that high angle is inverse to rush rich water richness sand tomography 6 in the hole
Rear end face on rear side of.
In the present embodiment, inclined shaft 13,13 front end of inclined shaft and institute's construction tunnel main tunnel are provided on rear side of the drain cavern 2
The intersection of 21 intersections and the two is inclined shaft intersection, and the inclined shaft intersection is located on rear side of the drain cavern intersection；
When carrying out the rear side preliminary excavation construction of tunnel construction sections in step 1, first along tunnel longitudinal extension from the front to the back to rear
It is located at the tunnel construction sections on rear side of the inclined shaft intersection in side tunnel construction sections 3 and carries out excavation construction；It is excavated to rear side tunnel construction sections 3 described
Behind the present position of inclined shaft intersection, then along tunnel longitudinal extension from the front to the back in rear side tunnel construction sections 3 be located at the inclined shaft
Tunnel construction sections between intersection and the drain cavern intersection carry out excavation construction, while to oblique since the inclined shaft intersection
Well 13 carries out excavation construction.
The rear side base tunnel section is the tunnel construction sections being gradually inclined outwardly from the front to the back, and the front side base tunnel section is from the front to the back
Gradually intilted tunnel construction sections.In the present embodiment, the rear side base tunnel section, the front side base tunnel section and rear side hole body with
Horizontal sextant angle between institute's construction tunnel main tunnel 21 is 60 °.Water between rear side hole body and institute's construction tunnel main tunnel 21
Flat angle is 60 °.
When practice of construction, the clear distance between front side hole body and institute's construction tunnel main tunnel 21 is 8m~9m, the middle part
Clear distance between base tunnel section and institute's construction tunnel main tunnel 21 is 26m~30m.
The excavated section of the detour base tunnel 1 and drain cavern 2 is respectively less than the excavated section of institute's construction tunnel main tunnel 21.This reality
It applies in example, the detour base tunnel 1 and drain cavern 2 are the service gallery of institute's construction tunnel main tunnel 21.
According to general knowledge known in this field, tunnel main tunnel 21 is with respect to for service gallery, and tunnel main tunnel 21 is to need to construct
Molding Tunnel, when constructing to tunnel main tunnel 21, need to usually construct service gallery, such as inclined shaft, tunnel Heng Dong, base tunnel
Deng.The detour base tunnel 1 and drain cavern 2 are bicycle road service gallery type section, the excavation of the detour base tunnel 1 and drain cavern 2
Section width (i.e. excavation width, the maximum excavation width of outline excavation) is 3.8m~6m and the excavation height of the two is
3.5m~5m.Thus, the detour base tunnel 1 and drain cavern 2 are narrow-bore tunnel, although the detour base tunnel 1 and drain cavern 2 are equal
Rich water richness sand tomography 6 is rushed across high angle is inverse, but compared to for institute's construction tunnel main tunnel 21, the detour base tunnel 1 and drain cavern 2
Difficulty of construction be greatly reduced, and the construction risk of the two is also greatly reduced.
In addition, the detour base tunnel 1 apart from institute's construction tunnel main tunnel 21 farther out, and detour base tunnel 1 select high angle it is inverse
The 6 relatively good position of earth formation of rich water richness sand tomography is rushed, thus its difficulty of construction and construction risk further decrease.Due to
From high angle against rushing, 5 difficulty of construction of middle part tunnel construction sections that rich water richness sand tomography 6 passes through is very big and very time-consuming, and use is circuitous
Middle part tunnel construction sections 5 can be bypassed after returning base tunnel 1, to the tunnel being located on front side of the preceding intersection of the base tunnel in institute's construction tunnel main tunnel 21
Duan Jinhang construction.Tunnel construction sections in institute's construction tunnel main tunnel 21 on front side of the preceding intersection of the base tunnel are constructed same
When, it can synchronize to the tunnel being located at after the base tunnel between intersection and the preceding intersection of the base tunnel in institute's construction tunnel main tunnel 21
Duan Jinhang construction, thus construction efficiency can be effectively improved, shorten the construction period；Also, it can be from intersection after the base tunnel and institute
It states the base tunnel position preceding intersection Liang Ge and hands over to being located at after the base tunnel in institute's construction tunnel main tunnel 21 before intersection and the base tunnel
Tunnel construction sections between prong are constructed in opposite directions, thus can further save the time, further shorten the construction period.
In the present embodiment, the clear distance between front side hole body and institute's construction tunnel main tunnel 21 is 8.4m, and the middle part is led
Cheating the clear distance between section and institute's construction tunnel main tunnel 21 is 28.4m.
When practice of construction, according to specific needs, to the clear distance between front side hole body and institute's construction tunnel main tunnel 21
And the clear distance between the middle part base tunnel section and institute's construction tunnel main tunnel 21 adjusts accordingly respectively.
In the present embodiment, front side hole body is gradually acclivitous inclination hole body from the front to the back, front side hole body
The gradient be 8%~11%.
In the present embodiment, the inclined shaft 13 for institute's construction tunnel main tunnel 21 service gallery.
When practice of construction, subsequent excavation construction is carried out to detour base tunnel 1 from the front to the back along tunnel extending direction in step 4
When, the face of the detour base tunnel 1 is located at the face rear of the front drain cavern body；
The middle part tunnel construction sections 5 of institute's construction tunnel main tunnel 21 are excavated from the front to the back along tunnel extending direction in step 4
When construction, the face of the middle part tunnel construction sections 5 is located at the face rear of the front drain cavern body.In this way, can effectively really
Protect the working security of detour base tunnel 1 and middle part tunnel construction sections 5.
In the present embodiment, the front side tunnel construction sections 4 divide on front side of the preceding intersection of the base tunnel front tunnel construction sections and
Rear portion tunnel construction sections on rear side of the preceding intersection of the base tunnel；
When carrying out front drain cavern body construction and detour base tunnel and tunnel main tunnel (21) synchronous construction in step 4, to circuitous
It returns after the completion of the construction of base tunnel 1, the front tunnel construction sections of front side tunnel construction sections 4 is excavated from the front to the back along tunnel longitudinal extension
Construction, while excavation construction is carried out to the rear portion tunnel construction sections of front side tunnel construction sections 4 from the front to the back along tunnel longitudinal extension, thus
Construction speed can be effectively improved, the construction period is shortened.Also, it in 5 work progress of middle part tunnel, can synchronize to front side tunnel
Road section 4 is constructed.
In the present embodiment, tunnel main tunnel supporting construction, the tunnel main tunnel supporting are provided in institute's construction tunnel main tunnel 21
Structure include it is split dig molding institute's construction tunnel main tunnel 21 carry out preliminary bracing the first Tunnel structure 14-1 and
The first Tunnel Second Lining 15-1 being laid on the inside of the first Tunnel structure 14-1, first Tunnel
Structure 14-1 and the first Tunnel Second Lining 15-1 is the supporting construction that tunneling boring supporting is carried out to institute's construction tunnel main tunnel 21；
Drain cavern supporting construction is provided in the drain cavern 2, the drain cavern supporting construction includes that split digging is molding
Drain cavern 2 carries out the second Tunnel structure 14-2 of preliminary bracing and is laid in the second Tunnel structure 14-2
Second Tunnel Second Lining 15-2, the second Tunnel structure 14-2 and the second Tunnel Second Lining 15-2 of inside
It is the supporting construction that tunneling boring supporting is carried out to drain cavern 2；
In step 1, when carrying out excavation construction to rear side tunnel construction sections 3 in step 2 and step 3, along the longitudinal extension side in tunnel
The molding progress of rear side tunnel construction sections 3 supporting is dug to split from the front to the back, and obtains the tunnel main tunnel supporting construction of construction molding；
When carrying out excavation construction to the scupper body of drain cavern 2 in step 2 and step 3, along tunnel longitudinal extension
It is split from the front to the back to dig the molding progress of drain cavern 2 supporting, and obtain the drain cavern supporting construction of construction molding；
Excavation construction is carried out to the scupper body of drain cavern 2 from the front to the back since the drain cavern intersection in step 2
Before, first to the first Tunnel structure 14-1 in region locating for the drain cavern intersection and the first Tunnel Second Lining
15-1 carries out aperture respectively, obtains the drain cavern intersection of construction molding；
The rear side detour base tunnel section of detour base tunnel 1 is carried out from the front to the back intersection after the base tunnel in step 3
Before excavation construction, first to the first Tunnel structure 14-1 in region locating for intersection after the base tunnel and the first tunnel
Secondary lining 15-1 carries out aperture respectively, obtains intersection after the base tunnel of construction molding.
In the present embodiment, the drain cavern 2 and detour base tunnel 1 are the service gallery of institute's construction tunnel main tunnel 21, described
Intersection, the preceding intersection of the base tunnel and the drain cavern intersection are service gallery hole, the service gallery after base tunnel
The intersection that hole is intersected for service gallery with institute construction tunnel main tunnel 21；
To the secondary lining of the first Tunnel structure 14-1 and the first tunnel in region locating for the drain cavern intersection
It builds 15-1 and carries out the boring method of aperture and the first Tunnel knot to region locating for intersection after the base tunnel respectively
The boring method that structure 14-1 and the first Tunnel Second Lining 15-1 carries out aperture respectively is identical and both for service gallery hole
Aperture method；
When carrying out aperture using the service gallery hole aperture method, to first of region locating for the service gallery hole
Tunnel structure 14-1 and the first Tunnel Second Lining 15-1 carry out aperture respectively, and process is as follows:
Step A1, the first Tunnel Second Lining aperture: secondary to first tunnel in region locating for the service gallery hole
Lining cutting 15-1 carries out aperture, obtains two lining holes；
The structure at two lining hole is identical as the structure at the service gallery hole；
Step A2, the first Tunnel structure aperture: to first tunnel in region locating for the service gallery hole
Preliminary bracing structure 14-1 carries out aperture, obtains just branch hole；
The structure at the just branch hole is identical as the structure at the service gallery hole；
Step A3, hole supporting: using circumferential steel arch-shelf to just branch hole carries out supporting, the circumferential direction described in step A2
Steel arch-shelf be to it is described just branch hole carry out tunneling boring supporting support bracket and its structure with it is described at the beginning of the structure at branch hole it is identical.
In the present embodiment, the inclined shaft intersection is the service gallery hole, to oblique since the inclined shaft intersection
Before well 13 carries out excavation construction, first to the first Tunnel structure 14-1 in region locating for the inclined shaft intersection and
First Tunnel Second Lining 15-1 carries out aperture respectively, obtains the inclined shaft intersection of construction molding.
To the first Tunnel structure 14-1 in region locating for the inclined shaft intersection and the first Tunnel Second Lining
The boring method that 15-1 carries out aperture respectively is service gallery hole aperture method.
To ensure stabilized structure, base tunnel supporting construction is provided in the detour base tunnel 1, the base tunnel supporting construction includes
At the beginning of the split molding detour base tunnel 1 of digging carries out the third Tunnel structure 14-3 of preliminary bracing and is laid in third tunnel
Third Tunnel Second Lining 15-3, the third Tunnel structure 14-3 and third tunnel on the inside of phase supporting construction 14-3
Road secondary lining 15-3 is the supporting construction that tunneling boring supporting is carried out to detour base tunnel 1.It is practical that detour base tunnel 1 is excavated
It is split from the front to the back to dig the molding progress of detour base tunnel 1 supporting when construction, and obtain the base tunnel supporting knot of construction molding
Structure.
Wherein, the tunnel main tunnel supporting construction in the front side tunnel construction sections 4 and rear side tunnel construction sections 3 is routine
Tunnel support structure, the first Tunnel Second Lining 15-1 be reinforced concrete lining layer.To the front side tunnel construction sections 4 with after
It when side tunnel construction sections 3 are excavated, is all made of full face tunneling method and is excavated, and excavated using drilling and blasting method.It is described to let out
Water hole supporting construction is conventional tunnel support structure, and the second Tunnel Second Lining 15-2 is reinforced concrete lining layer.It is described to lead
Pit supporting construction is conventional tunnel support structure, and third Tunnel Second Lining 15-3 is reinforced concrete lining layer.Detour is led
When hole 1 and drain cavern 2 are excavated, it is all made of drilling and blasting method and is excavated.When being excavated to middle part tunnel construction sections 5, also using brill
Quick-fried method is excavated.Thus, excavation and the supporting of the detour base tunnel 1, drain cavern 2, front side tunnel construction sections 4 and rear side tunnel construction sections 3
What method was all made of is conventional excavation and method for protecting support.
In the present embodiment, the first Tunnel Second Lining 15-1 is reinforced concrete structure, first tunnel initial-stage
Supporting construction 14-1 includes multiple tunneling boring branch laid from the front to the back and tunneling boring supporting is carried out to institute's construction tunnel main tunnel 21
Support and the Bolt net and jet preliminary bracing structure that tunneling boring supporting is carried out to institute's construction tunnel main tunnel 21, multiple tunneling boring supports
The structure snd size of frame are all the same and it is in uniformly distributed, shape and the institute's construction tunnel main tunnel 21 of the tunneling boring support frame
Transverse shape is identical；The Bolt net and jet preliminary bracing structure is the preliminary bracing knot using net spray method for protecting support construction molding
Structure, net spray preliminary bracing structure include the steel mesh being mounted in institute's construction tunnel main tunnel 21 and by one layer of injection in being applied
The concrete ejection layer that concrete on 21 inner wall of work tunnel main tunnel is formed, the steel mesh and the tunneling boring support frame bury
In the concrete ejection layer.Between the two neighboring tunneling boring support frame in front and back by multiple longitudinal connecting members into
Row is fastenedly connected.
When carrying out the first Tunnel Second Lining aperture in the present embodiment, in step A1, first in the first Tunnel Second Lining
Surveying and locating on the arch wall of 15-1, and mark out the excavation contour line at the service gallery hole；Meanwhile marking out two lining
The excavated section of the excavation contour line at hole, two lining hole amplifies 20cm than the excavated section at the service gallery hole
(i.e. the excavation contour line at two lining hole is located on the outside of the excavation contour line at the service gallery hole and between the two
Away from the reinforcing bar (hereinafter referred to as two lined steel muscle) of the first Tunnel Second Lining 15-1 and the overlap joint of splash guard for 20cm), is guaranteed, adopt
Ring cutting, joint-cutting depth are carried out with concrete (hereinafter referred to as two lining concrete) of the hand-held cutting machine to the first Tunnel Second Lining 15-1
5cm, it is ensured that do not damage two lined steel muscle, use quartering hammer to abolish two lining concretes after the completion of ring cutting, first cut intermediate position, two lining
20cm is reserved at the excavation contour line at hole manually uses pneumatic pick to be cut, it is ensured that the excavation contour line concrete at two lining hole
Neat and splash guard is not destroyed.After the completion of two lining concretes are abolished, cuts two lined steel muscle and splash guard, two lined steel muscle and splash guard are equal
It is cut using cutting machine, two lined steel muscle and splash guard reserve enough laps of splice, and two lined steel muscle reserve the lap of splice
70cm, splash guard reserve lap of splice 60cm.
When carrying out the first Tunnel structure aperture in step A2, the excavated section at the just branch hole is more auxiliary than described
Helping the excavated section at tunnel hole to amplify 10cm, (excavation contour line at the just branch hole is located at opening for the service gallery hole
Dig on the outside of contour line and spacing between the two be 10cm), the first Tunnel structure 14-1 is first cut using quartering hammer
Concrete ejection layer, the protection of two lining reserved steel bars and splash guard is carried out during cutting.
After the concrete ejection layer of the first Tunnel structure 14-1 is cut, the first Tunnel knot is cut
The tunneling boring support frame (i.e. just branch steel arch-shelf) in structure 14-1, uses 3m long lock foot anchor tube to original before cutting just branch steel arch-shelf
First branch steel arch-shelf is reinforced, while being reinforced using the circumferential steel arch-shelf, and the circumferential direction steel arch-shelf and the auxiliary are cheated
The tunneling boring support frame (the tunneling boring support frame after cutting) in region locating for road hole is fastenedly connected, after making cutting
The tunneling boring support frame arch springing it is not hanging.
In the present embodiment, the first Tunnel Second Lining 15-1 in the middle part tunnel construction sections 5 is the double-deck preliminary bracing
Structure, the first Tunnel Second Lining 15-1 in the middle part tunnel construction sections 5 are Tunnel Second Lining 16；
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (10)
1. one kind is passed through, high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, and the high angle refers to section dip angle
Greater than 60 °, it is characterised in that: the tunnel main tunnel (21) of institute's construction tunnel is divided into rear side tunnel construction sections (3), is located at rear side tunnel construction sections
(3) it front side tunnel construction sections (4) on front side of and is connected between rear side tunnel construction sections (3) and front side tunnel construction sections (4) and is rushed from high angle is inverse
The middle part tunnel construction sections (5) that rich water richness sand tomography (6) passes through；The same side of institute's construction tunnel main tunnel (21) is provided with detour base tunnel
(1) and drain cavern (2), the detour base tunnel (1) and drain cavern (2) are to pass through high angle from the front to the back inverse to rush rich water richness sand disconnected
The Tunnel of layer (6)；The detour base tunnel (1) be between rear side tunnel construction sections (3) and front side tunnel construction sections (4) excavate formation around
Capable base tunnel, the detour base tunnel (1) and institute's construction tunnel main tunnel (21) are laid in same level；The detour base tunnel
(1) it is divided into rear side base tunnel section, middle part base tunnel section and front side base tunnel section, the front side base tunnel section from the front to the back to be located at the rear side and lead
It cheats on front side of section, the middle part base tunnel section is connected between the rear side base tunnel section and the front side base tunnel section, the middle part base tunnel
Section is laid with institute's construction tunnel main tunnel (21) in parallel, and the rear side base tunnel section rear end is intersected with rear side tunnel construction sections (3) and the two
Intersection be base tunnel after intersection, the front side base tunnel section front end is intersected with front side tunnel construction sections (4) and the intersection of the two is
The preceding intersection of base tunnel；The rear side base tunnel section is located on rear side of middle part tunnel construction sections (5)；
The drain cavern (2) includes rear side hole body and is located on front side of the body of the rear side hole and with institute's construction tunnel main tunnel (21) in flat
The front side hole body that row is laid, front side hole body is located at the upper side of institute's construction tunnel main tunnel (21) and it is located at institute's construction tunnel
Between main tunnel (21) and the middle part base tunnel section, rear side hole body is gradually acclivitous Tunnel body from the front to the back；Institute
Hole body rear end is intersected with rear side tunnel construction sections (3) on rear side of stating and the intersection of the two is drain cavern intersection, is intersected after the base tunnel
Mouth and the drain cavern intersection are respectively positioned on rear side of middle part tunnel construction sections (5), and the drain cavern intersection and rear side hole body are equal
After the base tunnel on rear side of intersection；
Front side hole body is divided into rear portion hole body and breaks on front side of the body of the rear portion hole and across the inverse rich water richness sand that rushes of high angle
The front drain cavern body of layer (6), the draining of rear portion hole body composition drain cavern (2) in rear side hole body and front side hole body
Hole body；
The middle part base tunnel section is divided into rear portion base tunnel section and on front side of the rear portion base tunnel section and passes through that high angle is inverse to rush rich water
The rear portion base tunnel section composition detour of the front base tunnel section of rich sand tomography (6), the rear side base tunnel section and the middle part base tunnel section is led
Cheat the rear side detour base tunnel section of (1)；
When carrying out excavation and supporting construction to institute's construction tunnel, comprising the following steps:
Step 1: rear side tunnel construction sections tentatively excavate and supporting construction: along tunnel longitudinal extension from the front to the back to rear side tunnel
After tunnel construction sections in section (3) on rear side of the drain cavern intersection carry out excavation construction, and split digging is molding from the front to the back
Side tunnel construction sections (3) carry out supporting；
Step 2: rear side tunnel construction sections excavation synchronous with drain cavern scupper body and supporting construction: being excavated to rear side tunnel construction sections (3)
When at the present position of the drain cavern intersection, along tunnel longitudinal extension from the front to the back to being located in rear side tunnel construction sections (3)
Tunnel construction sections behind the drain cavern intersection and the base tunnel between intersection carry out excavation construction, while handing over from the drain cavern
Prong starts to carry out excavation construction to the scupper body of drain cavern (2) from the front to the back, and the split molding rear side of digging from the front to the back
Tunnel construction sections (3) and drain cavern (2) carry out supporting respectively；
Step 3: rear side tunnel construction sections, drain cavern scupper body and rear side detour base tunnel segment sync are excavated and supporting construction: to rear side
When tunnel construction sections (3) are excavated to after the base tunnel at the present position of intersection, along tunnel longitudinal extension from the front to the back to rear side
It is located at the tunnel construction sections after the base tunnel on front side of intersection in tunnel construction sections (3) and carries out excavation construction, and split from the front to the back scrapes out type
Rear side tunnel construction sections (3) carry out supporting；Meanwhile excavation construction is continued to the scupper body of drain cavern (2), and lead from described
Intersection starts to carry out excavation construction to the rear side detour base tunnel section of detour base tunnel (1) from the front to the back behind hole, and right from the front to the back
It excavates molding drain cavern (2) and detour base tunnel (1) carries out supporting respectively；
Step 4: front drain cavern body, front base tunnel section and middle part tunnel construction sections excavate and supporting construction:
The front drain cavern body, the front base tunnel section are all the same with the length of middle part tunnel construction sections (5) and three is in parallel cloth
If the front drain cavern body, the front base tunnel section and middle part tunnel construction sections (5) are divided into multiple tunnel segments from the front to the back,
The length of multiple tunnel segments is all the same；
When carrying out excavation and supporting construction to the front drain cavern body, from the front to the back to multiple institutes of the front drain cavern body
State tunnel segment carry out respectively excavate and supporting construction, the excavation and construction method for supporting of multiple tunnel segments it is all the same；
When carrying out excavation and supporting construction to the front base tunnel section, from the front to the back to the multiple described of the front drain cavern body
Tunnel segment carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are all the same；
When carrying out excavation and supporting construction to middle part tunnel construction sections (5), from the front to the back to multiple tunnels of middle part tunnel construction sections (5)
Segment carries out excavating respectively and supporting construction, the excavation and construction method for supporting of multiple tunnel segments are all the same；
The middle part tunnel construction sections (5) are from top to bottom divided into top hole body, middle part hole body (1-2) and lower part hole body (1-3), it is described on
The right side pilot tunnel (1-12) that portion hole body is divided into left side pilot tunnel (1-11) and is located on the right side of left side pilot tunnel (1-11)；
The preliminary bracing structure of the middle part tunnel construction sections (5) is the double-deck preliminary bracing structure, the bilayer preliminary bracing structure packet
Spray-up (25-2), more Pin at the beginning of including the concrete formed by one layer of injection in the concrete on tunnel main tunnel (21) inner wall to tunnel just
Hole (21) carries out supporting and props up the shaped steel arch (25) stood on the inside of the first spray-up (25-2) of concrete, sprayed by one layer in concrete
The concrete that concrete on first spray-up (25-2) is formed answers spray-up (25-1), more Pin and carries out supporting and branch to tunnel main tunnel (21)
Concrete is stood on to answer the grid steel frame (25-3) on the inside of spray-up (25-1) and answered on spray-up (25-1) by one layer of injection in concrete
The concrete that is formed of concrete in spray-up (25-8), the shaped steel arch (25) and grid steel frame (25-3) be to tunnel just
Hole (21) carries out the supporting steelframe of tunneling boring supporting and the shape of the two is identical as the transverse shape of tunnel main tunnel (21)；Institute
Stating concrete, just spray-up (25-2), concrete answer the transverse shape of spray-up (25-8) in spray-up (25-1) and concrete and tunnel
The transverse shape of road main tunnel (21) is identical；The structure of shaped steel arch described in more Pin (25) is all the same and it longitudinally extends along tunnel
Direction is laid from the front to the back, and shaped steel arch described in more Pin (25) is fastenedly connected by longitudinal connection structure to be integrated；More Pin
The structure of the grid steel frame (25-3) is all the same, the quantity and the quantity phase of shaped steel arch (25) of the grid steel frame (25-3)
Together, it is laid with grid steel frame described in a Pin (25-3) on the inside of shaped steel arch (25) described in every Pin, shaped steel arch described in every Pin
(25) it is laid on the same tunnel cross-section of tunnel main tunnel (21) with the grid steel frame (25-3) being laid on the inside of it；More Pin institutes
It states shaped steel arch (25) and is embedded in concrete and answer in spray-up (25-1), the concrete answer the thickness of spray-up (25-1) greater than type
The thickness of steel arch-shelf (25)；Grid steel frame described in more Pin (25-3) is embedded in spray-up in concrete (25-8), the coagulation
The thickness of spray-up (25-8) is greater than the thickness of grid steel frame (25-3) in soil；Shaped steel arch described in more Pin (25) in uniformly distributed,
Spacing between shaped steel arch (25) described in adjacent two Pin is d and the value range of d is 0.8m~1.2m；
The first spray-up (25-2) of concrete described in the bilayer preliminary bracing structure, shaped steel arch (25) and concrete described in more Pin
The first branch structure (18) of multiple spray-up (25-1) composition outer layer, grid steel frame (25- described in spray-up (25-8) and more Pin in the concrete
3) composition is located at the just branch structure (37) of the internal layer on the inside of the first branch structure (38) of outer layer；
Shaped steel arch described in every Pin (25) carries out the arch wall scaffold and one of supporting by one to tunnel main tunnel (21) arch wall
A tunnel inverted arch bracket (25-5) for carrying out supporting to tunnel main tunnel (21) bottom is spliced, the tunnel inverted arch bracket (25-
5) it is located at the underface of the arch wall scaffold and the two is located on same tunnel cross section, the tunnel inverted arch bracket (25-
5) a closed tunneling boring bracket is formed with the arch wall scaffold；The arch wall scaffold is described to being located at by one
The intracorporal top arch (25-4) in top hole and two side branch being symmetrically laid in below at left and right sides of top arch (25-4)
Frame (25-9) is spliced, and two side brackets (25-9) are respectively positioned in middle part hole body (1-2)；The tunnel inverted arch bracket
(25-5) is located in lower part hole body (1-3), the left end of the tunnel inverted arch bracket (25-5) and a side bracket (25-
9) bottom is fastenedly connected, and the right end of the tunnel inverted arch bracket (25-5) and another described side bracket bottom (25-9) fasten
Connection；The top arch (25-4) is by the left side arch (25-41) in left side pilot tunnel (1-11) and is located at right side pilot tunnel
Right side arch (25-42) in (1-12) is spliced；
When carrying out excavation and supporting either one or two of middle part tunnel construction sections (5) the tunnel segment, comprising the following steps:
Step F1, top hole body excavates and preliminary bracing, process are as follows:
Step F11, it left side pilot drive and outer layer preliminary bracing: is excavated from the front to the back to current along tunnel longitudinal extension
The left side pilot tunnel (1-11) of tunnel segment is excavated；
In left side pilot tunnel (1-11) digging process, sprayed on excavating molding left side pilot tunnel (1-11) inner wall from the front to the back
One layer concrete obtains the just spray-up (25-2) of the concrete in left side pilot tunnel (1-11), and is excavating molding left side from the front to the back
The interior installation left side arch (25-41) of pilot tunnel (1-11), and stand on left side arch (25-41) branch in the first spray-up (25-2) of concrete
Side；A layer concrete, which is sprayed, on the collateral vertical first spray-up (25-2) of the concrete for having left side arch (25-41) including simultaneously obtains a left side
Concrete in side pilot tunnel (1-11) answers spray-up (25-1), and so that left side arch (25-41) is embedded in concrete and answer spray-up (25-
1) in, the work progress of the first branch structure (38) of left side pilot tunnel (1-11) ectonexine is completed；
Step F12, right side pilot drive and outer layer preliminary bracing: in left side pilot tunnel (1-11) digging process described in step F11,
The right side pilot tunnel (1-12) to current institute's tunneling segment is excavated from the front to the back along the synchronization of tunnel longitudinal extension,
It obtains and excavates molding top hole body；
In right side pilot tunnel (1-12) digging process, sprayed on excavating molding right side pilot tunnel (1-12) inner wall from the front to the back
One layer concrete obtains the just spray-up (25-2) of the concrete in right side pilot tunnel (1-12), and is excavating molding right side from the front to the back
Right side arch (25-42) is installed in pilot tunnel (1-12), right side arch (25-42) branch is made to stand on concrete just spray-up (25-2) inside
And be fastenedly connected right side arch (25-42) with left side arch (25-41) and be integrated, obtain the top arch of construction molding
(25-4)；A layer concrete is sprayed on the collateral first spray-up (25-2) of the vertical concrete for having right side arch (25-42) inside simultaneously to obtain
The concrete obtained in right side pilot tunnel (1-12) answers spray-up (25-1), and so that right side arch (25-42) is embedded in concrete and answer spray-up
In (25-1), the work progress of the first branch structure (38) of outer layer in the body of the top hole is completed；
In this step in digging process, after the face of the right side pilot tunnel (1-12) is located at the face of left side pilot tunnel (1-11)
Side；
Step F2, middle part hole body excavation and outer layer preliminary bracing: carrying out in the body digging process of top hole in step F1, vertical along tunnel
It is being excavated below molding top hole body to the middle part hole of current institute's tunneling segment from the front to the back to extending direction
Body (1-2) is excavated；
In the middle part hole body (1-2) digging process, one is sprayed on excavating molding middle part hole body (1-2) inner wall from the front to the back
Layer concrete obtains the just spray-up (25-2) of the concrete in middle part hole body (1-2), and is excavating molding middle part hole from the front to the back
Side bracket (25-9) is installed respectively at left and right sides of body (1-2), side bracket (25-9) branch is made to stand on concrete just spray-up (25-
2) inside and to be fastenedly connected each side bracket (25-9) with top arch (25-4) described in step F12 be one
Body；A layer concrete, which is sprayed, on the collateral first spray-up (25-2) of the vertical concrete for having side bracket (25-9) inside simultaneously obtains middle part
Concrete in hole body (1-2) answers spray-up (25-1), and so that side bracket (25-9) is embedded in concrete and answer in spray-up (25-1),
Complete the work progress of the first branch structure (38) of middle part hole body (1-2) ectonexine；
The side bracket (25-9) of left and right two and top arch (25- described in step F12 in middle part hole body (1-2)
4) connection composition arch wall arch；
In this step in digging process, the face of middle part hole body (1-2) is located at right side pilot tunnel (1- described in step F12
12) on rear side of face；
Step F3, lower part hole body excavation and outer layer preliminary bracing: carrying out in step F2 in the body digging process of middle part hole, vertical along tunnel
The lower part hole below molding middle part hole body (1-2) to current institute's tunneling segment is being excavated from the front to the back to extending direction
Body (1-3) is excavated, and is obtained and is excavated molding tunnel main tunnel (21)；
In the lower part hole body (1-3) digging process, one is sprayed on excavating molding lower part hole body (1-3) inner wall from the front to the back
Layer concrete obtains the just spray-up (25-2) of the concrete in lower part hole body (1-3), and is excavating molding lower part hole from the front to the back
Tunnel inverted arch bracket (25-5) is installed in body (1-3), tunnel inverted arch bracket (25-5) branch is made to stand on concrete just spray-up (25-2)
Inside and tunnel inverted arch bracket (25-5) is made to connect to form shaped steel arch (25) with arch wall arch described in step F2；Including simultaneously
A layer concrete, which is sprayed, on the collateral first spray-up (25-2) of the vertical concrete for having tunnel inverted arch bracket (25-5) obtains lower part hole body (1-
3) concrete in answers spray-up (25-1), and so that tunnel inverted arch bracket (25-5) is embedded in concrete and answer in spray-up (25-1), complete
At the work progress of the first branch structure (38) of tunnel main tunnel (21) ectonexine；
In this step in digging process, the face of lower part hole body (1-3) is located at middle part hole body (1-2) described in step F2
Face on rear side of；
Step F4, it internal layer preliminary bracing and two lining constructions: in step F3 in digging process, also needs from the front to the back in construction molding
The first collateral vertical grid steel frame (25-3) in branch structure (38) of outer layer, while collateral inside from the front to the back vertical having grid steel frame (25-
3) layer concrete is sprayed in the first branch structure (38) of outer layer and obtains spray-up (25-8) in concrete, and makes grid steel frame (25-3)
It is embedded in spray-up in concrete (25-8), completes the work progress of the first branch structure (37) of internal layer, obtain the described of construction molding
The double-deck preliminary bracing structure；
During carrying out internal layer preliminary bracing in step F4, from the front to the back in the double-deck preliminary bracing structure of construction molding
Inside construction tunnel secondary lining (36) completes the excavation and Bracing Process of the tunnel segment；
Step 5: front side tunnel construction sections excavate and supporting construction: the front side tunnel construction sections (4) are divided into positioned at the preceding intersection of the base tunnel
The front tunnel construction sections of front side and the rear portion tunnel construction sections on rear side of the preceding intersection of the base tunnel；
After the completion of the front base tunnel section described in the step 4 is excavated, the front side base tunnel section is excavated from the front to the back, and by
The backward preceding split molding detour base tunnel (1) of digging carries out supporting, until completing detour base tunnel (1) excavation and Bracing Process；
After the completion of detour base tunnel (1) is excavated, along tunnel longitudinal extension from the front to the back to the front tunnel of front side tunnel construction sections (4)
Road section is excavated, and the molding front tunnel construction sections of split digging carry out supporting from the front to the back；Longitudinally extend along tunnel simultaneously
The rear portion tunnel construction sections of front side tunnel construction sections (4) are from the front to the back excavated in direction, and from the front to the back it is split dig it is molding it is described after
Portion's tunnel construction sections carry out supporting.
Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, feature 2. described in accordance with the claim 1
It is: when being excavated from the front to the back to the front base tunnel section in step 4 along tunnel extending direction, the detour base tunnel (1)
Face be located on rear side of the face of the front drain cavern body；
When being excavated from the front to the back to middle part tunnel construction sections (5) in step 4 along tunnel extending direction, the middle part tunnel construction sections (5)
Face be located on rear side of the face of detour base tunnel (1).
Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support 3. according to claim 1 or 2, it is special
Sign is: being provided with tunnel main tunnel supporting construction in the tunnel main tunnel (21), the tunnel main tunnel supporting construction includes split
Molding institute's construction tunnel main tunnel (21) is dug to carry out the first Tunnel structure (14-1) of preliminary bracing and be laid in the
The first Tunnel Second Lining (15-1) on the inside of one Tunnel structure (14-1), the first Tunnel structure
(14-1) and the first Tunnel Second Lining (15-1) are the supporting knot that tunneling boring supporting is carried out to institute's construction tunnel main tunnel (21)
Structure；The first Tunnel Second Lining (15-1) in the middle part tunnel construction sections (5) is the double-deck preliminary bracing structure, the middle part
The first Tunnel Second Lining (15-1) in tunnel construction sections (5) is Tunnel Second Lining (16)；
Drain cavern supporting construction is provided in the drain cavern (2), the drain cavern supporting construction, which includes that split digging is molding, lets out
Water hole (2) carries out the second Tunnel structure (14-2) of preliminary bracing and is laid in the second Tunnel structure
The second Tunnel Second Lining (15-2) on the inside of (14-2), the second Tunnel structure (14-2) and the second tunnel two
Secondary lining cutting (15-2) is the supporting construction that drain cavern (2) are carried out with tunneling boring supporting；
In step 1, when carrying out excavation construction to rear side tunnel construction sections (3) in step 2 and step 3, along tunnel longitudinal extension
It is split from the front to the back to dig molding rear side tunnel construction sections (3) progress supporting, and obtain the tunnel main tunnel supporting construction of construction molding；
When carrying out excavation construction to the scupper body of drain cavern (2) in step 2 and step 3, along tunnel longitudinal extension by
It is split before backward to dig molding drain cavern (2) progress supporting, and obtain the drain cavern supporting construction of construction molding；
When carrying out excavation construction to each of the front drain cavern body tunnel segment in step 4, longitudinally prolong along tunnel
Stretching direction, the split molding drain cavern (2) of digging carries out supporting from the front to the back, and obtains the drain cavern supporting construction of construction molding.
Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, feature 4. described in accordance with the claim 3
It is: excavation construction is carried out to the scupper body of drain cavern (2) from the front to the back since the drain cavern intersection in step 2
Before, first to the first secondary lining of Tunnel structure (14-1) and the first tunnel in region locating for the drain cavern intersection
It builds (15-1) and carries out aperture respectively, obtain the drain cavern intersection of construction molding；
The rear side detour base tunnel section of detour base tunnel (1) is opened from the front to the back intersection after the base tunnel in step 3
Before excavation construction, first to the first Tunnel structure (14-1) in region locating for intersection after the base tunnel and the first tunnel
Secondary lining (15-1) carries out aperture respectively, obtains intersection after the base tunnel of construction molding.
5. passing through according to claim 4, high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, feature
Be: the drain cavern (2) and detour base tunnel (1) are the service gallery of tunnel main tunnel (21), intersection, institute after the base tunnel
Stating the preceding intersection of base tunnel and the drain cavern intersection is service gallery hole, the service gallery hole be service gallery with
The intersection of institute's construction tunnel main tunnel (21) intersection；
To the first Tunnel structure (14-1) in region locating for the drain cavern intersection and the first Tunnel Second Lining
(15-1) carries out the boring method of aperture and the first Tunnel knot to region locating for intersection after the base tunnel respectively
It is identical and both for service gallery that structure (14-1) carries out the boring method of aperture with the first Tunnel Second Lining (15-1) respectively
Hole aperture method；
When carrying out aperture using the service gallery hole aperture method, to first tunnel in region locating for the service gallery hole
Preliminary bracing structure (14-1) and the first Tunnel Second Lining (15-1) carry out aperture respectively, and process is as follows:
Step A1, the first Tunnel Second Lining aperture: to first Tunnel Second Lining in region locating for the service gallery hole
(15-1) carries out aperture, obtains two lining holes；
The structure at two lining hole is identical as the structure at the service gallery hole；
Step A2, the first Tunnel structure aperture: to first tunnel initial-stage in region locating for the service gallery hole
Supporting construction (14-1) carries out aperture, obtains just branch hole；
The structure at the just branch hole is identical as the structure at the service gallery hole；
Step A3, hole supporting: using circumferential steel arch-shelf to just branch hole carries out supporting, the circumferential direction steel arch described in step A2
Frame be to it is described just branch hole carry out tunneling boring supporting support bracket and its structure with it is described at the beginning of the structure at branch hole it is identical.
Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support 6. according to claim 1 or 2, it is special
Sign is: being provided with temporary support structure on the inside of shaped steel arch described in every Pin (25), the temporary support structure and is laid in outer
The shaped steel arch (25) of side is laid on the same cross section of tunnel main tunnel (21)；The temporary support structure includes being supported in
It interim vertical supporting column (25-41) below left side arch (25-41) right end and is connected to the left side arch bottom (25-41) and faces
When the bottom vertical supporting column (24-1) between interim inverted arch bracket (24-2), the interim vertical supporting column (24-1) and interim
Inverted arch bracket (24-2) is respectively positioned in the body of the top hole；
During carrying out left side pilot drive and outer layer preliminary bracing in step F11, led from the front to the back in the molding left side of excavation
In hole (1-11) when arch (25-41) of installation left side, interim vertical supporting need to be also installed below left side arch (25-41) right end
Column (24-1), and fastened left side arch (25-41) and interim vertical supporting column (24-1) by interim inverted arch bracket (24-2)
It is connected as one；It is molding that the bottom of the left side arch (25-41) and interim vertical supporting column (24-1) is supported in excavation
The bottom left side pilot tunnel (1-11), the interim inverted arch bracket (24-2) are supported horizontally on left side bottom pilot tunnel (1-11)；
It carries out from the front to the back removing the temporary support structure in the body digging process of middle part hole in step F2.
Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support 7. according to claim 1 or 2, it is special
Sign is: the anchoring system that tunnel main tunnel (21) are carried out with supporting is provided on the outside of shaped steel arch described in every Pin (25), it is described
Anchoring system and shaped steel arch (25) on its inside are laid on same tunnel cross section；
The anchoring system includes the arch between left side arch (25-41) and right side arch (25-42) on the outside of junction
Lock foot anchor tube (32) and two symmetrical locking foot anchor tubes (33) for being laid in bottom outside at left and right sides of top arch (25-4), two
Lock foot anchor tube (34), two side bracket (25- in one are provided on the outside of the middle part of a side bracket (25-9)
9) bottom outside is provided with lock foot anchor tube (35), two middle lock foot anchor tubes (34) under one and is symmetrically arranged, and two
The lower lock foot anchor tube (35) is symmetrically arranged；Arch lock foot anchor tube (32), locking foot anchor tube (33), middle lock foot anchor tube
(34) He Xiasuo foot anchor tube (35) is the lock foot anchor tube entered in tunnel main tunnel (21) the side rock stratum from the inside to the outside；
During carrying out right side pilot drive and outer layer preliminary bracing in step F11, also need along tunnel longitudinal extension by rear
It constructs in the molding left side pilot tunnel (1-11) of excavation to arch lock foot anchor tube (32) forward；
During carrying out right side pilot drive and outer layer preliminary bracing in step F12, also need along tunnel longitudinal extension by rear
It constructs respectively in the molding top hole body of excavation to two locking foot anchor tubes (33) forward；
It carries out also needing molding in excavation from the front to the back along tunnel longitudinal extension in the body digging process of middle part hole in step F2
It constructs respectively in middle part hole body (1-2) to two middle lock foot anchor tubes (34)；
It carries out in the body digging process of lower part hole, also needs molding in excavation from the front to the back along tunnel longitudinal extension in step F3
It constructs respectively in lower part hole body (1-3) to two lower lock foot anchor tubes (35).
Pass through that high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support 8. according to claim 1 or 2, it is special
Sign is: before carrying out top hole body excavation and preliminary bracing in step F1, needing first surpass current institute's construction tunnel segment
Preceding supporting, and obtain the tunnel segment advance support structure of current constructed segment；The abutment wall of the tunnel main tunnel (21) is divided into
Upper wall body and the lower wall body immediately below the upper wall body；
The tunnel segment advance support structure includes the lead pipe-shed support knot that supporting is carried out to the same tunnel segment
Structure and per-fore pouring liquid with small pipe supporting construction, the longitudinal length of the lead pipe-shed support structure are greater than the length of the tunnel segment
Degree；
The lead pipe-shed support structure includes more and is crept into tunnel main tunnel (21) front of tunnel heading rock stratum from the front to the back
Pipe canopy pipe (28) and a pipe canopy leading truck that the more pipe canopy pipes (28) are oriented to, more pipe canopy pipe (28) edges
The arch contour line of tunnel main tunnel (21) is laid from left to right；It is provided on the pipe canopy leading truck multiple for pipe canopy pipe (28)
The rear end of the pipe canopy pipe mounting hole (29) of installation, the more pipe canopy pipes (28) is mounted on the pipe canopy leading truck；
The per-fore pouring liquid with small pipe supporting construction includes that multiple arch walls to the same tunnel segment carry out advance support
Arch wall per-fore pouring liquid with small pipe supporting construction, multiple arch wall per-fore pouring liquid with small pipe supporting construction in it is uniformly distributed and its
It is laid from the front to the back along tunnel longitudinal extension, the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back is taken
Spreading degree is not more than 3m；Spacing L=n × d between the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back,
In, it be 3~6, d is taking for spacing between shaped steel arch (25) described in adjacent two Pin and d that n, which is the value range of positive integer and n,
Value range is 0.8m~1.2m；The abutment wall of the tunnel main tunnel (21) is divided into upper wall body and is located at immediately below the upper wall body
Lower wall body；
Each arch wall per-fore pouring liquid with small pipe supporting construction includes a ductule leading truck, one to the tunnel section
The arch per-fore pouring liquid with small pipe supporting construction of the arch progress advance support of section and left and right two are respectively to the tunnel segment
The lower wall body of left and right sides abutment wall carries out the abutment wall per-fore pouring liquid with small pipe supporting construction of advance support, and two abutment walls are super
Preceding grouting with small pipe supporting construction is symmetrically arranged, and two abutment wall per-fore pouring liquid with small pipe supporting construction and the arch are super
Preceding grouting with small pipe supporting construction is laid on the same tunnel cross section and the longitudinal length of three is all the same；It is each described
Arch per-fore pouring liquid with small pipe supporting construction includes more and is crept into from the front to the back to tunnel main tunnel (21) front of tunnel heading rock stratum
Interior arch slip casting ductule (22), the more arch slip casting ductules (22) along tunnel main tunnel (21) arch contour line by
Left-to-right is laid；Each abutment wall per-fore pouring liquid with small pipe supporting construction includes more and is crept into from the front to the back to tunnel
Abutment wall slip casting ductule (23) in main tunnel (21) front of tunnel heading rock stratum, the more abutment wall slip casting ductules (23) are along tunnel
The lower wall body contour line of main tunnel (21) is from top to bottom laid；Each arch wall per-fore pouring liquid with small pipe supporting knot
The structure snd size of all abutment wall slip casting ductules (23) and all arch slip casting ductules (22) are all the same in structure and it is uniformly distributed
On the same tunnel cross section of tunnel main tunnel (21)；
The ductule leading truck is small to all abutment wall slip castings in the arch wall per-fore pouring liquid with small pipe supporting construction
The leading truck that conduit (23) and all arch slip casting ductules (22) are oriented to respectively, the ductule leading truck are initial stage branch
It protects arch (25)；The arch of the ductule leading truck is provided with multiple arches for arch slip casting ductule (22) installation from left to right
Portion's mounting hole, the left and right sides lower part of the ductule leading truck are provided with multiple sides for abutment wall slip casting ductule (23) installation
Portion's mounting hole, abutment wall slip casting ductule (23) and arch slip casting ductule in the arch wall per-fore pouring liquid with small pipe supporting construction
(22) rear end is mounted on the same ductule leading truck.
9. passing through according to claim 8, high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, feature
It is: before carrying out top hole body excavation and preliminary bracing in step F1, advance pipe first is carried out to current institute's construction tunnel segment
Canopy supporting obtains the lead pipe-shed support structure of the tunnel segment；
Top hole body and middle part hole body (1-2) form middle and upper part hole body, the height of top hole body and lower part hole body (23)
Degree is all larger than 4m, and the height of middle part hole body (1-2) is not more than 10m；
It is being excavated below molding top hole body to the middle part of current institute's tunneling segment from the front to the back in step F2
When hole body (1-2) is excavated, multiple excavation segments is divided to open middle part hole body (1-2) of the tunnel segment from the front to the back
It digs；
Before being excavated any one described excavation segment, per-fore pouring liquid with small pipe first is carried out to the arch wall of the excavation segment and is added
Gu and obtaining the per-fore pouring liquid with small pipe supporting construction；
Each length for excavating segment is between the two neighboring arch wall per-fore pouring liquid with small pipe supporting construction in front and back
Spacing L it is identical.
10. passing through according to claim 8, high angle is inverse to rush rich water richness sand tomography tunnel excavation and method for protecting support, feature
Be: the tunnel main tunnel (21) is divided into hole body and the hole body under the tunnel immediately below hole body on the tunnel, institute on tunnel
The cross section of hole body on tunnel is stated as semicircle；The upper wall body of the abutment wall is located on the tunnel in the body of hole and its underpart wall
Body is located under the tunnel in the body of hole；Two abutment wall per-fore pouring liquid with small pipe supporting construction are respectively positioned on hole body under the tunnel
Outside；
The region that the arch mounting hole is opened up on the ductule leading truck is arch aperture area, the shape of the arch aperture area
Shape is arc and its central angle is 120 °；
The region that pipe canopy pipe mounting hole (29) is opened up on the pipe canopy leading truck is top aperture area, the shape of the top aperture area
Shape is arc and its central angle is 180 °.
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| CN114109421B (en) * | 2021-12-03 | 2024-01-30 | 中铁隧道局集团有限公司 | Construction method for open TBM through long fault fracture zone |
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