CN108756899A - A kind of control of large deformation tunnel becomes excavation method - Google Patents
A kind of control of large deformation tunnel becomes excavation method Download PDFInfo
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- CN108756899A CN108756899A CN201810595766.7A CN201810595766A CN108756899A CN 108756899 A CN108756899 A CN 108756899A CN 201810595766 A CN201810595766 A CN 201810595766A CN 108756899 A CN108756899 A CN 108756899A
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 32
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 11
- 235000009566 rice Nutrition 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 88
- 239000010959 steel Substances 0.000 claims description 88
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 210000003771 C cell Anatomy 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 13
- 241000209094 Oryza Species 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 7
- 238000003032 molecular docking Methods 0.000 claims description 7
- 238000005457 optimization Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000007363 ring formation reaction Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 230000005641 tunneling Effects 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 101100510615 Caenorhabditis elegans lag-2 gene Proteins 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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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
- 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
- E21D11/28—Longitudinal struts, i.e. longitudinal connections between adjoining arches
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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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention provides a kind of control of large deformation tunnel and becomes excavation method, optimizes section, adjusts structure outline curvature, uses arch to justify for holocentric, side wall is large radius arc, is connected with small-radius arc between inverted arch and side wall；Optimize steelframe combining form, Rational choice gradual change deformation allowance, especially first layer and the second layer are applied between excavating interface by deformation 25cm, increase linear curvature；Middle step replaces interim inverted arch using 6.5m long anchor poles, and passive bound is switched to active constraint；" rice " type I18 longerons are added between steelframe；For Special Geological Condition, length of bench, height are reasonably selected.To solve to carry out construction there are prodigious construction risk to the mountain tunnel of such geological condition using conventional construction method, construction risk is extremely uncontrollable, the problems such as also extending the construction period to a certain extent.The invention belongs to constructing tunnel fields.
Description
Technical field
The present invention relates to a kind of controls of large deformation tunnel to become method, tunnel underground structrue engineering technical field.
Background technology
With the quickening of domestic infrastructure construction, a large amount of constructions of Tunnel Engineering, will inevitably cope with various
Large deformation caused by special geology.And the topography and geomorphology where passing through the mountain tunnel of tomography weakness band is usually surface water easily converges
The area of collection, the beautiful fragrant railway ancestor currently to construct think tunnel excavation and are disclosed as carbonaceous shale, and resistance to compression shearing strength is low, meets water
Easily soften, without self-stable ability, also because of country rock large deformation, preliminary bracing is caused to change, these largely increase construction
Risk.
However, in the prior art, lacking the construction method that can become construction to the control of large deformation tunnel, and because pass through the mountain ridge
The geological condition in tunnel is very special, also seldom for the construction method of reference, and uses conventional construction method to such geology
The mountain tunnel of situation is constructed, and there are prodigious construction risks, and construction risk can also be made to become extremely uncontrollable, also
The construction period is extended to a certain extent.
Invention content
It is an object of the invention to：A kind of control of large deformation tunnel is provided and becomes excavation method, to solve using conventional construction
Method carries out construction there are prodigious construction risk to the mountain tunnel of such geological condition, and construction risk is extremely uncontrollable, also
The problems such as extending the construction period to a certain extent.
To solve the above problems, quasi- become excavation method using the control of such a large deformation tunnel,
1. optimizing section, structure outline curvature is adjusted, uses arch to justify for holocentric, side wall is large radius arc, diameter
It for 725-730cm, is connected with small-radius arc between inverted arch and side wall, a diameter of 290-300cm；
2. optimizing steelframe combining form, Rational choice gradual change deformation allowance, especially first layer and the second layer excavate interface
Between applied by deformation 25cm, increase linear curvature to 1.65-1.69 times of conventional curvature, it is ensured that steelframe connecting plate stress
Weakness is closely connected, and steelframe cyclization rear profile is smoother；
3. middle step replaces interim inverted arch using 6.5m long anchor poles, passive bound is switched into active constraint；
4. adding " rice " type I18 longerons between steelframe；
5. being directed to Special Geological Condition, length of bench, height are reasonably selected.
Further, the optimization steelframe combining form should meet design profile requirement, and ensure that each step curvature is linear
The interface connection of drop-over, especially first layer and the second layer excavation should connect smoother with form after deformation；
Further, the middle step 6.5m long anchor poles lag 2 and excavate cycle completion, and ensure drilling machine working space；
Further, " rice " type I18 longerons are synchronously completed with preliminary bracing system between the steelframe, and are welded with front and back steelframe
It connects securely；
Further, the reasonable selection length of bench, height, should combine actually has water section and anhydrous section of dynamic to adjust；
" rice " the type I18 longerons include I-steel, and I-steel is I18 I-steel, length of the steel arch-shelf along tunnel in tunnel
The setting of direction equidistantly distributed is spent, it is angularly disposed between two neighboring steel arch-shelf to have two sections of I-steel, between adjacent two steel arch-shelf
Distance be 50cm, length is 71cm, and the both ends of I-steel are processed as be mutually parallel 45 degree oblique angles, and the both ends of I-steel are pasted
The side wall for being welded in steel arch-shelf is closed, and distance is 50cm between the lower end of I-steel and steel arch-shelf arch springing, the arch springing is steel arch
The bottom of frame, with adjacent three steel arch-shelfs for one group, three steel arch-shelfs are fixed by four sections of I-steel at X-type distribution setting to be connected
It connects.
Further include having connection reinforcing bar, connection reinforcing bar is 25mm straight thread reinforced bars, length 85cm, between two neighboring steel arch-shelf
Angularly disposed to have two sections of connection reinforcing bars, the both ends for connecting reinforcing bar are individually fixed on adjacent two steel arch-shelf, with adjacent three steel arches
Frame be one group, three steel arch-shelfs by X-type distribution setting four sections connection reinforcing bars be fixedly connected, steel arch-shelf with connect reinforcing bar
Connection type is single-sided welding, and weld length is to be welded with steelframe connection with the steel arch-shelf lap of splice, the bottom of steel arch-shelf
Plate is located on steel arch-shelf on the upside of steelframe connecting plate and is fixed with lock foot anchor tube, and the I-steel is set to the upside of lock foot anchor tube,
Steel-bar arrangement is connected in the upside of I-steel.
2. optimizing in steelframe combining form, steps are as follows for the specific docking of steelframe connecting plate：
Step 1：Deformation rule is collected by construction site, determines preliminary bracing steel frame deformation amount, and then determines that steelframe connects
The pre- variate of connection member；
Step 2：Angle processing is carried out before construction to the steelframe of unit B steelframe and C cell steelframe junction, specific side
Method is：In steelframe connecting plate and steelframe ontology junction, angle is carried out to steelframe ontology using the outside of steelframe ontology as open end
Cutting, angle are cut to the inside of steelframe ontology, then weld steelframe connecting plate and the steelframe body end after cutting again
So that there are one new inclination angle, the unit B steelframe and C cell steelframes for the steelframe connecting plate tool of steelframe body end
It is two sections of steelframes that the A unit steelframes lower end in Tunnel steelframe as vault is docked successively；
Step 3：Tunnel excavation simultaneously carries out preliminary bracing to the top that tunnel has preferentially been dug, that is, installs A units steelframe and B
Unit steelframe；
Step 4：Continue tunneling, A units steelframe and unit B steelframe deform and gradually stablize, and then, work as tunnel
After the completion of being excavated in the middle part of road, C cell steelframe is docked in the lower end of unit B steelframe, at this point, due to A units steelframe and unit B
Steelframe deforms and stablizes, and when unit B steelframe and C cell steelframe dock, the circular arc that the two is formed is mellow and full smooth.
The specific docking structure of the steelframe connecting plate includes unit B steelframe, and unit B steelframe is and Tunnel steel
The unit steelframe being connected to each other as the both ends of the A unit steelframes of vault in frame, unit B steelframe include the steelframe ontology and steel of arc
Frame connecting plate, the end of steelframe ontology is oblique to be cut with angle, and the open end of the angle is opened in the outside of steelframe ontology, tiltedly
The end of mouth extends to the inside of steelframe ontology, and passing through opening up for angle has 1.5- inside and outside the end for making steelframe ontology
The length difference of 2.5cm, steelframe connecting plate and the end of the steelframe ontology after cutting angle are welded and fixed.
Compared with prior art, advantage of the present invention is as follows：
1, section curvature is adjusted, optimizes steelframe combining form, makes its stress evenly, rationally, renitency ability is reinforced,
Deformation is reduced, security risk is reduced；
2, gradual change deformation allowance is chosen, it is made to deform at larger node (especially first layer and the second layer excavate interface)
Connecting plate is closely connected, promotes shear resistance, it is ensured that quality of connection；
3, middle step replaces interim inverted arch using 6.5m long anchor poles, and passive bound is switched to active constraint, relieves synchronization
The limitation of operation, increases working space, improves construction speed, controlled level convergent deformation, entire Soil Anchor Design is concise, by
Power is clear, easy to operate, saved the construction time, has particularly important realistic meaning for constructing tunnel.
Description of the drawings
Fig. 1 is the section optimization figure of the present invention；
Fig. 2 is the step constitutional diagram of the present invention；
Fig. 3 is the attachment structure schematic diagram of " rice " type I18 longerons；
Fig. 4 is present invention optimization steelframe combining form figure；
Fig. 5 is unit B steelframe after cutting angle, B, structural schematic diagram when C cell steelframe is directly docked before construction；
Fig. 6 is structural schematic diagram of the unit B steelframe before cutting angle；
Fig. 7 is structural schematic diagram of the unit B steelframe after cutting angle.
Wherein, reference numeral：1- top bars, step in 2-, step (left side) in 201-, step (right side) in 202-, 3- leave office
Rank, 301 get out of a predicament or an embarrassing situation on (left side), and 302- gets out of a predicament or an embarrassing situation on (right side), and 4- inverted arch just props up；
6- loopfuls just prop up, 7- deformation allowances, 8- composite linings, 9- internal rails top, 10- inverted arch lining cutting, 101- cable troughs
And ditch
11-A unit steelframes, 21-B unit steelframes, 211- steelframes ontology (unit B steelframe), (B is mono- for 221- steelframes connecting plate
First steelframe), 231- angles (unit B steelframe), 31-C unit steelframes, 41-D unit steelframes, 51-E unit steelframes, 61-F unit steel
Frame, the pre- allowance of 71- gradual changes, 81- composite linings；
501- I-steel, 502- steel arch-shelfs, 503- connection reinforcing bars, 504- lock foot anchor tube, 505- steelframe connecting plates.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
The detailed description of step, it should be understood that described herein specific examples are only used to explain the present invention, is not used to limit this hair
It is bright.
Embodiment：
With reference to attached drawing 1-5, the present embodiment provides a kind of controls of large deformation tunnel to become excavation method, specific as follows：
1. optimizing section, structure outline curvature is adjusted, uses arch to justify for holocentric, side wall is large radius arc
(R726cm), (R295cm) is connected with small-radius arc between inverted arch and side wall, there is the Reasonable Shape for adapting to stress flow and deformation,
So that structure stress and adjoining rock stability are in advantage, keep its stress more reasonable, to meet design Clearance requirement.
2. optimizing steelframe combining form, Rational choice gradual change deformation allowance, especially first layer and the second layer excavate interface
Between by deformation 25cm apply, increase linear curvature to 1.657 times of conventional curvature, conventional curvature is 438, which is
726, it is ensured that steelframe connecting plate stress weakness is closely connected, and steelframe cyclization rear profile is smoother, and balanced resistance to deformation pressure makes its stress
State is more reasonable, avoids local pressure uneven, and deformation aggravation, evagination, optimization steelframe combining form should meet design profile requirement,
And ensure each linear drop-over of step curvature, especially first layer and the second layer, which excavate interface connection, to connect circle with form after deformation
It is suitable；
The specific docking structure of steelframe connecting plate is with reference to attached drawing 2 to 5, and when construction constructs by Fig. 1, first construction A, unit B
Steelframe, construction are completed to wait for stable structure, are reduced in the both ends meeting of unit B steelframe and dock place with C cell steelframe upper end in Fig. 1, should
Structure includes unit B steelframe 21, and unit B steelframe 21 is and the A units steelframe 11 as vault in Tunnel steelframe
The unit steelframe that both ends are connected to each other, unit B steelframe 21 include the steelframe ontology 211 and steelframe connecting plate 221 of arc, steelframe ontology
211 end is oblique to be cut with angle 231 (pre- to become the outer angle of steelframe), and the open end of the angle 231 is opened in steelframe sheet
The outside of body 41, the end of angle 231 extend to the inside of steelframe ontology 41, make steelframe ontology 211 by opening up for angle 231
The end inside and outside with 1.5-2.5cm length difference, i.e. the open end of angle 231 is wider 1.5-2.5cm than tail end, steelframe
Connecting plate 221 and the end of the steelframe ontology 211 after cutting angle 231 are welded and fixed.
The method docked to large deformation tunnel steelframe prearrangement of deformation amount unit using above structure is as follows：
Step 1：Deformation rule is collected by construction site, determines preliminary bracing steel frame deformation amount, and then determines that steelframe connects
The pre- variate of connection member；
Step 2：Angle processing is carried out before construction to the steelframe of 31 junction of unit B steelframe 21 and C cell steelframe, is had
Body method is：It is open end to steelframe using the outside of steelframe ontology 211 in steelframe connecting plate 221 and 211 junction of steelframe ontology
(outside of the steelframe ontology 211 is the side towards wall, and inside refers to towards channel for the cutting of the progress angle 231 of ontology 211
Side), angle 231 is cut to the inside of steelframe ontology, then, the steel cut away that fish steelframe connecting plate 221 is connected
211 part of frame ontology is cut away from steelframe connecting plate 221 again, then the steelframe ontology 211 by steelframe connecting plate 221 and after cutting
Again it welds end so that for the tool of steelframe connecting plate 221 of 211 end of steelframe ontology there are one new inclination angle, the B is mono-
First steelframe 21 and C cell steelframe 31 are that 11 lower end of A units steelframe in Tunnel steelframe as vault is docked successively
Two sections of steelframes, referred to as the units steelframe such as A, B, C are that (unit B steelframe 21 and C cell steelframe 31 are being applied for the usual call of this field
Before work, if being processed without step 2, when steelframe connecting plate 221 of the two at docking docks, the circular arc that the two is formed is mellow and full
Smoothly, meet the original fabrication design requirement of steelframe)；
Step 3：Tunnel excavation simultaneously carries out preliminary bracing to the top that tunnel has preferentially been dug, that is, installs 11 He of A units steelframe
Unit B steelframe 21；
Step 4：Continuing tunneling, A units steelframe 11 and unit B steelframe 21 deform and gradually stablize, then,
After the completion of tunnel middle part is excavated, the docking C cell steelframe 31 in the lower end of unit B steelframe 21, at this point, due to A unit steel
Frame 11 and unit B steelframe 21 deform and stablize, when unit B steelframe 21 and C cell steelframe 31 dock, circle that the two is formed
Arc is mellow and full smooth.
3. middle step replaces interim inverted arch using 6.5m long anchor poles, middle step 6.5m long anchor poles lag 2 excavations and have recycled
At, and ensure drilling machine working space, passive bound is switched into active constraint, the limitation of synchronization job is relieved, increases operation
Space improves construction speed, controlled level convergent deformation；
4. adding " rice " type I18 longerons between steelframe, " rice " type I18 longerons are synchronously completed with preliminary bracing system between steelframe,
And with front and back steelframe firm welding, so that it is mutually constrained, whole stress；
With reference to attached drawing 1, " rice " type I18 longerons include I-steel 501, and I-steel 501 is I18 I-steel, steel arch in tunnel
Length direction equidistantly distributed of the frame 502 along tunnel is arranged, angularly disposed between two neighboring steel arch-shelf 502 to have two sections of I-steel
501, the distance between adjacent two steel arch-shelf 502 is 50cm, and length is 71cm, and the both ends of I-steel 501 are processed as mutually putting down
45 degree of capable oblique angles, the both ends fitting of I-steel 501 are welded in the side wall of steel arch-shelf 502, and the lower end of I-steel 501 and steel arch
Distance is 50cm between 502 arch springing of frame, and the arch springing is the bottom of steel arch-shelf, with adjacent three steel arch-shelfs 502 for one group, three
Steel arch-shelf 502 is fixedly connected by four sections of I-steel 501 at X-type distribution setting.
Further include having connection reinforcing bar 503, connection reinforcing bar 503 is 25mm straight thread reinforced bars, length 85cm, two neighboring steel arch
It is angularly disposed between frame 502 to there are two sections of connection reinforcing bars 503, the both ends of connection reinforcing bar 503 to be individually fixed in adjacent two steel arch-shelf 502
On, with adjacent three steel arch-shelfs 502 for one group, three steel arch-shelfs 502 pass through four sections of connection reinforcing bars 503 at X-type distribution setting
It is fixedly connected, steel arch-shelf 502 is single-sided welding with the connection type for connecting reinforcing bar 503, and weld length is to be overlapped with steel arch-shelf 502
The bottom of length, steel arch-shelf 502 is welded with steelframe connecting plate 505, is located at the upper of steelframe connecting plate 505 on steel arch-shelf 502
Side is fixed with lock foot anchor tube 504, and the I-steel 501 is set to the upside of lock foot anchor tube 504, and connection reinforcing bar 503 is set to work
The upside of word steel 501.
5. being directed to Special Geological Condition, length of bench, height are reasonably selected, as early as possible just branch closing cyclization, it should be in conjunction with practical
There are water section and anhydrous section of dynamic to adjust.
Claims (7)
1. a kind of control of large deformation tunnel becomes excavation method, which is characterized in that the specific method is as follows：
1. optimizing section, structure outline curvature is adjusted, uses arch to justify for holocentric, side wall is large radius arc, a diameter of
725-730cm is connected between inverted arch and side wall with small-radius arc, a diameter of 290-300cm；
2. optimizing steelframe combining form, Rational choice gradual change deformation allowance, especially first layer and the second layer excavate between interface
It is applied by deformation 25cm, 1.65-1.69 times of increasing linear curvature to conventional curvature, it is ensured that steelframe connecting plate stress is weak
Locate closely connected, steelframe cyclization rear profile is smoother；
3. middle step replaces interim inverted arch using 6.5m long anchor poles, passive bound is switched into active constraint；
4. adding " rice " type I18 longerons between steelframe；
5. being directed to Special Geological Condition, length of bench, height are reasonably selected.
2. a kind of control of large deformation tunnel becomes excavation method according to claim 1, it is characterised in that：The middle step 6.5m long
Anchor pole lags 2 and excavates cycle completion, and ensures drilling machine working space.
3. a kind of control of large deformation tunnel becomes excavation method according to claim 1, it is characterised in that：" rice " type between the steelframe
I18 longerons are synchronously completed with preliminary bracing system, and with front and back steelframe firm welding.
4. a kind of control of large deformation tunnel becomes excavation method according to claim 1, it is characterised in that：" rice " the type I18 is vertical
Beam includes I-steel (501), and I-steel (501) is I18 I-steel, length direction etc. of the steel arch-shelf (502) along tunnel in tunnel
Spacing distribution is arranged, angularly disposed between two neighboring steel arch-shelf (502) to have two sections of I-steel (501), adjacent two steel arch-shelf
The distance between (502) it is 50cm, length is 71cm, and the both ends of I-steel (501) are processed as be mutually parallel 45 degree of oblique angles,
The both ends fitting of I-steel (501) is welded in the side wall of steel arch-shelf (502), and the lower end of I-steel (501) and steel arch-shelf (502)
Distance is 50cm between arch springing, and the arch springing is the bottom of steel arch-shelf, with adjacent three steel arch-shelfs (502) for one group, three steel
Arch (502) is fixedly connected by four sections of I-steel (501) at X-type distribution setting.
5. a kind of control of large deformation tunnel becomes excavation method according to claim 4, it is characterised in that：Further include having connection reinforcing bar
(503), connection reinforcing bar (503) is 25mm straight thread reinforced bars, and length 85cm is angularly disposed between two neighboring steel arch-shelf (502)
There are two sections of connection reinforcing bars (503), the both ends of connection reinforcing bar (503) are individually fixed on adjacent two steel arch-shelf (502), with adjacent three
A steel arch-shelf (502) is one group, and three steel arch-shelfs (502) connect by the way that four sections of connection reinforcing bars (503) at X-type distribution setting are fixed
It connects, steel arch-shelf (502) is single-sided welding with the connection type for connecting reinforcing bar (503), and weld length is to be overlapped with steel arch-shelf (502)
The bottom of length, steel arch-shelf (502) is welded with steelframe connecting plate (505), is located at steelframe connecting plate on steel arch-shelf (502)
(505) lock foot anchor tube (504) is fixed on the upside of, the I-steel (501) is set to the upside of lock foot anchor tube (504), connection
Reinforcing bar (503) is set to the upside of I-steel (501).
6. a kind of control of large deformation tunnel becomes excavation method according to claim 1, which is characterized in that optimization steelframe combining form
In, steps are as follows for the specific docking of steelframe connecting plate：
Step 1：Deformation rule is collected by construction site, determines preliminary bracing steel frame deformation amount, and then determines that steelframe connects structure
The pre- variate of part；
Step 2：Angle processing is carried out before construction to the steelframe of unit B steelframe and C cell steelframe junction, specific method is：
In steelframe connecting plate and steelframe ontology junction, angle cutting is carried out to steelframe ontology using the outside of steelframe ontology as open end,
Angle is cut to the inside of steelframe ontology, then welds steelframe connecting plate and the steelframe body end after cutting again,
So that there are one new inclinations angle for the steelframe connecting plate tool of steelframe body end, the unit B steelframe and C cell steelframe are tunnels
The two sections of steelframes docked successively as the A unit steelframes lower end of vault in preliminary bracing steelframe；
Step 3：Tunnel excavation simultaneously carries out preliminary bracing to the top that tunnel has preferentially been dug, that is, installs A units steelframe and unit B
Steelframe；
Step 4：Continue tunneling, A units steelframe and unit B steelframe deform and gradually stablize, then, when in tunnel
After the completion of portion is excavated, C cell steelframe is docked in the lower end of unit B steelframe, at this point, due to A units steelframe and unit B steelframe
It deforms and stablizes, when unit B steelframe and C cell steelframe dock, the circular arc that the two is formed is mellow and full smooth.
7. a kind of control of large deformation tunnel becomes excavation method according to claim 1, it is characterised in that：The steelframe connecting plate
Specific docking structure includes unit B steelframe (21), and unit B steelframe (21) is and the A as vault in Tunnel steelframe
The unit steelframe that the both ends of unit steelframe (11) are connected to each other, unit B steelframe (21) include the steelframe ontology (211) and steelframe of arc
Connecting plate (221), the end of steelframe ontology (211) is oblique to be cut with angle (231), and the open end of the angle (231) opens up
The end in the outside in steelframe ontology (41), angle (231) extends to the inside of steelframe ontology (41), passes through angle (231)
Open up inside and outside the end for making steelframe ontology (211) with 1.5-2.5cm length difference, steelframe connecting plate (221) with cut
The end for cutting the steelframe ontology (211) after angle (231) is welded and fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595766.7A CN108756899B (en) | 2018-06-11 | 2018-06-11 | Variable control excavation method for large-deformation tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595766.7A CN108756899B (en) | 2018-06-11 | 2018-06-11 | Variable control excavation method for large-deformation tunnel |
Publications (2)
| Publication Number | Publication Date |
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| CN108756899A true CN108756899A (en) | 2018-11-06 |
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| CN112780287A (en) * | 2021-02-03 | 2021-05-11 | 中铁二局第一工程有限公司 | Violent-desertification dolomite small-section tunnel excavation system and method |
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Inventor after: Wan Fei Inventor after: Xue Yunke Inventor after: Qin Kai Inventor after: Gu Qi Hui Inventor after: Shen Ke Inventor after: Tian Libing Inventor after: Li Changsong Inventor after: Chen Lin Inventor after: Li Li Inventor after: Liang Enhua Inventor after: Cai Chenglin Inventor after: Tang Zhongquan Inventor after: Pu Tongti Inventor after: He Fusheng Inventor after: Wang Guowei Inventor after: Zeng Jun Inventor before: Wan Fei Inventor before: Qin Kai Inventor before: Gu Qi Hui Inventor before: Shen Ke Inventor before: Tian Libing Inventor before: Li Changsong Inventor before: Chen Lin Inventor before: Li Li Inventor before: Liang Enhua Inventor before: Tang Zhongquan Inventor before: Pu Tongti Inventor before: He Fusheng Inventor before: Wang Guowei Inventor before: Zeng Jun Inventor before: Xue Yunke |