CN108150190B - Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure and construction method - Google Patents
Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure and construction method Download PDFInfo
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- CN108150190B CN108150190B CN201810015853.0A CN201810015853A CN108150190B CN 108150190 B CN108150190 B CN 108150190B CN 201810015853 A CN201810015853 A CN 201810015853A CN 108150190 B CN108150190 B CN 108150190B
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- 239000011435 rock Substances 0.000 title claims abstract description 50
- 238000010276 construction Methods 0.000 title claims abstract description 30
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 34
- 230000008878 coupling Effects 0.000 claims abstract description 28
- 238000010168 coupling process Methods 0.000 claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 238000009412 basement excavation Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000005641 tunneling Effects 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 135
- 239000010959 steel Substances 0.000 claims description 135
- 239000007787 solid Substances 0.000 claims description 14
- 239000002689 soil Substances 0.000 claims description 13
- 229920002472 Starch Polymers 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 11
- 235000019698 starch Nutrition 0.000 claims description 11
- 238000007569 slipcasting Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000009415 formwork Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000009955 starching Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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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
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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Abstract
Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure and construction method, belongs to Tunnel Engineering field.It includes friction pile, grouting and reinforcing coupling beam, cant beam and mini pile that Unevenly-pressured shallow tunnel rock crusher section, which excavates safeguard structure,；Friction pile is equally spaced along two lateral edge wiring direction of tunnel excavation profile；Grouting and reinforcing coupling beam sequentially passes through shallow embedding side friction pile and massif, and both ends are connected with the friction pile of tunnel two sides respectively；Cant beam is arranged along slope surface, and both ends are connected with buried side and shallow embedding side antiskid stake top respectively；The tunneling in the region that friction pile and grouting and reinforcing coupling beam surround applies mini pile and reinforces tunnel bottom, applies lining cutting.The present invention forms safeguard structure before tunnel excavation, can significantly improve the stability on tunnel side hillside, and balanced bias power effectively prevents sliding and vault slump of the Unevenly-pressured shallow tunnel in digging process.
Description
Technical field
The present invention relates to Unevenly-pressured shallow tunnel rock crusher sections to excavate safeguard structure, belongs to Tunnel Engineering technical field.
Background technique
With the high speed development of economic construction of China, traffic infrastructure investment is continued to increase, especially highway, height
After fast railway enters mountain area, Tunnel Engineering is largely built.These tunnels are most of along the river, are close to mountain wiring, often exist enclose along the line
The unfavorable operating conditions such as broken, the landform bias of rock, or even there is the possibility on landslide.Bias will cause the uneven stress in tunnel, gently then
Tunnel arch is caused to deform, it is heavy then destroy tunnel structure；Especially rock crushing, the serious Shallow Section of weathering, arching ability is poor,
Above rock easily causes the generation of the geological disasters such as landslide, collapsing after by excavation disturbance, tired so as to cause tunnel excavation driving
Difficulty influences tunnel normal construction and operation, threatens people life property safety.How to be ensured using more effective safeguard structure
Constructing tunnel operation security is the frequent problems faced of Unevenly-pressured shallow tunnel rock crusher section construction.
Safeguard procedures in existing Unevenly-pressured shallow tunnel rock crusher section construction mainly have: increasing lining thickness, add
Anchor pole and Guan Peng, steel arch-shelf rigidity is increased to reduce the sliding of the deformation of lining cutting and hole body in digging process；It is added in shallow embedding side
Gravity Retaining Wall is native in shallow embedding side backfill back-pressure, passes through Gravity Retaining Wall or back-pressure soil body balance portion biasing force.These
It is relatively low for the supporting intensity for being crushed loose Rock And Soil although method simple process, it is not directed to tunnel perimeter Rock And Soil
Reinforcing does not reinforce unstable massif fundamentally, only increases the rigidity or local stiffening of tunnel structure itself
Massif resists biasing force, it is difficult to meet the Shallow Tunnel Construction Operational requirements under the extremely unfavorable operating condition such as bias, rock crusher.Cause
This, being badly in need of one kind reinforcement and strengthening tunnel perimeter country rock body and can reduce or eliminate the novel protective structure of tunnel biasing force,
To ensure tunnel safety, high efficient driving.
Summary of the invention
The object of the present invention is to provide a kind of Unevenly-pressured shallow tunnel rock crusher sections to excavate safeguard structure and construction method.
The present invention is that Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure and construction method, Unevenly-pressured shallow tunnel country rock
Reduction stage excavates safeguard structure, including friction pile 3, grouting and reinforcing coupling beam 4, cant beam 9 and mini pile 12；Friction pile 3 is set by inner wall
It sets insertion I-steel 5 in the rectangular steel pipe 6 of grouting nozzle 8 and casting concrete is constituted, be routed along 2 outline excavation of tunnel, two lateral edge
Direction is equally spaced；Grouting and reinforcing coupling beam 4 is the reinforcing body that casting concrete is formed in round steel pipe 7, is sequentially passed through shallow
Side friction pile 3 and massif 1 are buried, is finally protruded into buried side friction pile 3；Cant beam 9 is cast-in-place concrete structure, is arranged along slope surface,
Both ends are connected with buried side and 3 stake top of shallow embedding side friction pile respectively；In the region that friction pile 3 and grouting and reinforcing coupling beam 4 surround
Tunneling 2 applies mini pile 12 and reinforces tunnel bottom, applies lining cutting.
Unevenly-pressured shallow tunnel rock crusher section excavates the construction method of safeguard structure, construction procedure are as follows:
(1) prefabricated components: the rectangular steel pipe 6 that is prefabricated in the factory, round steel pipe 7, circular cover 11 and plugging plate 13；Rectangle steel
The elongated grouting nozzle 8 for being welded with blossom type arrangement of 6 inner wall of pipe, opens up circular hole in 6 short side two sidewalls of rectangular steel pipe；Round steel pipe 7
The elongated grouting nozzle 8 for being welded with blossom type arrangement of inner wall；The diameter of circular cover 11 is equal to the diameter of round steel pipe 7, center
Weld grouting nozzle 8；Plugging plate 13 is circular steel plate；
(2) stake side starches solid layer 10 and constructs: in tunnel, 2 outline excavation, two lateral edge wiring direction excavates rectangle stake holes, and side is excavated
Rectangular steel pipe 6 is inserted on side, until stake end stretch enters in slide surface stable rock stratum below, by being arranged on 6 inner wall of rectangular steel pipe
Grouting nozzle 8 to 6 outside pressure slip casting of rectangular steel pipe, formed on the outside of rectangular steel pipe 6 and starch solid layer 10；
(3) operation platform excavates: excavating Rock And Soil on the outside of shallow embedding side friction pile 3, it is flat to form a construction on the outside of stake
The absolute altitude of platform, operation platform is lower than 34 ~ 5m of stake top absolute altitude of shallow embedding side friction pile；
(4) grouting and reinforcing coupling beam 4 is constructed: circular hole is reserved along shallow embedding side rectangular steel pipe 6 to 1 inner excavation leveling peg of massif
Round steel pipe 7 is inserted into when excavating in hole, and round steel pipe 7 sequentially passes through shallow embedding side rectangular steel pipe 6, massif 1, and protrudes into same section
In interior buried side rectangular steel pipe 6, guarantee that 0.5 ~ 1.0m in rectangular steel pipe 6 is inserted at 7 both ends of round steel pipe respectively；By being arranged in circle
The grouting nozzle 8 of 7 inner wall of shape steel pipe is formed to 7 outside pressure slip casting of round steel pipe starches solid layer 10, welds and justifies at 7 both ends of round steel pipe
Shape cover board 11 injects concrete into steel pipe by the grouting nozzle 8 being arranged in circular cover 11 and forms grouting and reinforcing coupling beam 4；
(5) friction pile 3 pours: is welded at the circular hole in 6 outside of shallow embedding side rectangular steel pipe with plugging plate 13 and blocks rectangle steel
Pipe 6, rectangular steel pipe 6 is interior to be inserted into I-steel 5, and 5 edge of a wing of I-steel is apart from rectangular steel pipe 6 far from 2 20 ~ 30cm of side of tunnel, web
It moves towards vertical with tunnel 2 and is overlapped with 6 center line of rectangular steel pipe；Then casting concrete forms friction pile in rectangular steel pipe 6
3, stake top absolute altitude is above ground level；
(6) cant beam 9 applies: slope surface being flattened, along slope surface formwork and assembling reinforcement, casting concrete forms cant beam 9；
(7) tunnel excavation is constructed: friction pile 3 and grouting and reinforcing coupling beam 4 to all sections apply completion and meet design
After intensity requirement, the tunneling 2 in the closed area that friction pile 3 and grouting and reinforcing coupling beam 4 are formed；
(8) mini pile 12 and lining construction: high-pressure rotary spraying method is used to form mini pile in constructing tunnel in tunneling
12, after completing the construction that the section shallow unsymmetrial loading tunnel rock crusher section excavates safeguard structure, apply lining cutting；
(9) protection knot is excavated according to step (2) ~ step (8) construction next section Unevenly-pressured shallow tunnel rock crusher section
Structure.
Beneficial effects of the present invention: (1) friction pile is arranged in tunnel trunk two sides, and friction pile is mounted in good ground, puts down
Weighed biasing force caused by landform, improves the stability of massif side side slope；(2) by grouting nozzle slip casing by pressure, in antiskid
Formed in stake stake week and starch solid layer, that is, play the role of with the common antiskid of friction pile, also improve the physical force of fragmented rock body around
Property is learned, the globality that supporting construction periphery is crushed Rock And Soil is effectively enhanced, reduces the lateral pressure of supporting construction receiving；
(3) grouting and reinforcing coupling beam and cant beam increase the globality of tunnel two sides friction pile, help to enhance the steady of vault breaking surrounding rock
It is qualitative, vault slump occurs when can prevent from excavating；(4) rectangular steel pipe and round steel pipe retaining wall during pore digging act on,
There is template action again in the casting concrete stage, insertion I-steel and round steel pipe synergistic effect constitute entire in rectangular steel pipe
The skeleton of safeguard structure；(5) mini pile is set at tunnel bottom, improves the bearing capacity of tunnel foundation.
Detailed description of the invention
Fig. 1 is the A-A of safeguard structure in Fig. 2 to sectional view；Fig. 2 is the elevation of safeguard structure；Fig. 3 be rectangular steel pipe with
I-steel relative position schematic diagram；Fig. 4 is round steel pipe schematic diagram.Appended drawing reference and corresponding title are as follows: massif 1, resists tunnel 2
Sliding pile 3, I-steel 5, rectangular steel pipe 6, round steel pipe 7, grouting nozzle 8, cant beam 9, starches solid layer 10, circular lid at grouting and reinforcing coupling beam 4
Plate 11, mini pile 12, plugging plate 13.
Specific embodiment
The present invention is further described for several specific examples with reference to the accompanying drawing, and the given examples are served only to explain the present invention, and
It is non-to be only limitted to this example.All equivalent replacements made in the principle of the invention, modification belong to the present invention after reading the present invention
Protection scope.
The working principle of the invention is: (1) antiskid principle: the solid layer of friction pile and slurry, which plays, to be resisted side slope sliding force and adds
Gu the effect of periphery Rock And Soil；The power that grouting and reinforcing coupling beam and cant beam realize buried side friction pile is transmitted to the antiskid of shallow embedding side
Stake, and strengthen the Rock And Soil at the top of tunnel excavation profile；Mini pile strengthens the broken Rock And Soil at tunnel bottom, improves ground and holds
Carry power；Each component collective effect forms relatively stable tunnel excavation region, guarantees the safety of constructing tunnel.(2) initial lining cutting
Principle: by grouting nozzle to slip casting around friction pile and grouting and reinforcing coupling beam, foring the solid layer of slurry around tunnel excavation profile,
Play the role of initial lining cutting, improves the stability of breaking surrounding rock.(3) it is crushed the grouting and reinforcing principle of Rock And Soil: passing through
Grouting nozzle slip casing by pressure into massif in the grouting nozzle and round steel pipe of rectangular steel pipe inner wall connects in friction pile and grouting and reinforcing
It is formed around beam and starches solid layer, effectively enhanced the globality that Tunnel Design section periphery is crushed Rock And Soil, be obviously improved tunnel and open
Dig the stability and safety of section.(4) retaining wall principle: when excavating friction pile stake holes, it is inserted into rectangular steel pipe when excavating, is played
Retaining wall effect, effectively prevents loose rock blocks and falls.
As shown in Fig. 1 ~ Fig. 4, Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure, including friction pile 3, grouting and reinforcing
Coupling beam 4, cant beam 9 and mini pile 12；Friction pile 3 is inserted into I-steel 5 in the rectangular steel pipe 6 by inner wall setting grouting nozzle 8 and pours
Concrete is constituted, and is equally spaced along 2 outline excavation of tunnel, two lateral edge wiring direction；Grouting and reinforcing coupling beam 4 is round steel pipe 7
The reinforcing body that interior casting concrete is formed, sequentially passes through shallow embedding side friction pile 3 and massif 1, both ends respectively with 2 two sides of tunnel
Friction pile 3 is connected；Cant beam 9 be cast-in-place concrete structure, along slope surface be arranged, both ends respectively with buried side and shallow embedding side friction pile 3
Stake top is connected；The tunneling 2 in the region that friction pile 3 and grouting and reinforcing coupling beam 4 surround applies mini pile 12 and reinforces tunnel bottom,
Apply lining cutting.
As shown in Fig. 1 ~ Fig. 3, the elongated grouting nozzle 8 for being welded with blossom type arrangement of 6 inner wall of rectangular steel pipe used in friction pile 3,
Rectangular steel pipe 6 also opens up circular hole perpendicular to the side wall of 2 wiring direction of tunnel, and circular hole is located at 3 stake top of shallow embedding side friction pile or less, applies
More than work platform, the circular hole on circular hole and shallow embedding side rectangular steel pipe 6 in same section on buried rectangular steel pipe 6 is located at same water
In plane.
As shown in Figure 1, Figure 3,5 model I56a ~ I63c of I-steel, the edge of a wing is apart from rectangular steel pipe 6 far from 2 side of tunnel
20 ~ 30cm, web move towards vertical with tunnel 2 and are overlapped with 6 center line of rectangular steel pipe.
As Figure 1 and Figure 4, open up that Circularhole diameter is identical, and both ends are welded on 7 outer diameter of round steel pipe and rectangular steel pipe 6
Circular cover 11, the elongated grouting nozzle 8 for being welded with blossom type arrangement of inner wall.
As shown in Figure 3, Figure 4, grouting nozzle 8 is arc-shaped round tube, and circular arc internal diameter is 10 ~ 20cm, and round tube diameter is 2 ~ 3cm.
As shown in Figure 1 and Figure 2,9 deck-molding of cant beam is equal to the height that friction pile 3 exceeds slope surface, wide equal with 3 width of friction pile.
As shown in figure 4,11 diameter of circular cover is equal to the diameter of round steel pipe 7, center weld has grouting nozzle 8.
Unevenly-pressured shallow tunnel rock crusher section excavates the construction method of safeguard structure, construction procedure are as follows:
(1) prefabricated components: the rectangular steel pipe 6 that is prefabricated in the factory, round steel pipe 7, circular cover 11 and plugging plate 13；Rectangle steel
A length of 1.5 ~ the 2m in 6 cross section of pipe, wide 1 ~ 1.5m, the elongated grouting nozzle 8 for being welded with blossom type arrangement of inner wall are short in rectangular steel pipe 6
Side two sidewalls open up the circular hole of 0.6 ~ 1m, and circular hole is located at 3 stake top of shallow embedding side friction pile or less, 3 ~ 4m；7 outer diameter of round steel pipe etc.
In the diameter for opening up circular hole on rectangular steel pipe 6, the elongated grouting nozzle 8 for being welded with blossom type arrangement of inner wall；Circular cover 11 it is straight
Diameter is equal to the diameter of round steel pipe 7, center weld grouting nozzle 8；Plugging plate 13 is the circular steel plate that diameter is 1 ~ 1.2m；
(2) stake side starches solid layer 10 and constructs: at 2 ~ 3 meters of 2 outline excavation two sides of tunnel place, along wiring direction excavation rectangular pile
Rectangular steel pipe 6 is inserted into when excavating in hole, until stake end stretch enters in slide surface stable rock stratum below, by being arranged in rectangle steel
Grouting nozzle 8 on 6 inner wall of pipe forms on the outside of rectangular steel pipe 6 to 6 outside pressure slip casting of rectangular steel pipe and starches solid layer 10；
(3) operation platform excavates: excavating Rock And Soil on the outside of shallow embedding side friction pile 3, it is flat to form a construction on the outside of stake
The absolute altitude of platform, operation platform is lower than 34 ~ 5m of stake top absolute altitude of shallow embedding side friction pile；
(4) grouting and reinforcing coupling beam 4 is constructed: circular hole is reserved along shallow embedding side rectangular steel pipe 6 to 1 inner excavation leveling peg of massif
Round steel pipe 7 is inserted into when excavating in hole, and round steel pipe 7 sequentially passes through shallow embedding side rectangular steel pipe 6, massif 1, and protrudes into same section
In interior buried side rectangular steel pipe 6, guarantee that 0.5 ~ 1.0m in rectangular steel pipe 6 is inserted at 7 both ends of round steel pipe respectively；By being arranged in circle
The grouting nozzle 8 of 7 inner wall of shape steel pipe is formed to 7 outside pressure slip casting of round steel pipe starches solid layer 10, welds and justifies at 7 both ends of round steel pipe
Shape cover board 11 injects concrete into steel pipe by the grouting nozzle 8 being arranged in circular cover 11 and forms grouting and reinforcing coupling beam 4；
(5) friction pile 3 pours: the circular hole in 6 outside of shallow embedding side rectangular steel pipe is welded on the plugging plate 13 of 1 ~ 1.2m of diameter
Place blocks rectangular steel pipe 6, is inserted into I-steel 5 in rectangular steel pipe 6,5 edge of a wing of I-steel is apart from rectangular steel pipe 6 far from 2 side of tunnel
20 ~ 30cm, web move towards vertical with tunnel 2 and are overlapped with 6 center line of rectangular steel pipe；Then coagulation is poured in rectangular steel pipe 6
Soil forms friction pile 3, stake top absolute altitude 0.5 ~ 1m above ground level；
(6) cant beam 9 applies: slope surface being flattened, along slope surface formwork and assembling reinforcement, casting concrete forms cant beam 9；
(7) tunnel excavation is constructed: friction pile 3 and grouting and reinforcing coupling beam 4 to all sections apply completion and meet design
After intensity requirement, the tunneling 2 in the closed area that friction pile 3 and grouting and reinforcing coupling beam 4 are formed；
(8) mini pile 12 and lining construction: high-pressure rotary spraying method is used to form mini pile in constructing tunnel in tunneling
12, after completing the construction that the section shallow unsymmetrial loading tunnel rock crusher section excavates safeguard structure, apply lining cutting；
(9) protection knot is excavated according to step (2) ~ step (8) construction next section Unevenly-pressured shallow tunnel rock crusher section
Structure.
Claims (8)
1. Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure, including friction pile (3), grouting and reinforcing coupling beam (4), cant beam
(9) and mini pile (12), which is characterized in that friction pile (3) is by being inserted into work in the rectangular steel pipe (6) of inner wall setting grouting nozzle (8)
Word steel (5) and casting concrete composition, are equally spaced along two lateral edge wiring direction of tunnel (2) outline excavation；Grouting and reinforcing
Coupling beam (4) is the reinforcing body that the interior casting concrete of round steel pipe (7) is formed, and sequentially passes through shallow embedding side friction pile (3) and massif
(1), it finally protrudes into buried side friction pile (3)；Cant beam (9) be cast-in-place concrete structure, along slope surface be arranged, both ends respectively with depth
Side is buried to be connected with shallow embedding side friction pile (3) stake top；Tunnel is excavated in the region that friction pile (3) and grouting and reinforcing coupling beam (4) surround
Road (2) applies mini pile (12) and reinforces tunnel bottom, applies lining cutting.
2. Unevenly-pressured shallow tunnel rock crusher section according to claim 1 excavates safeguard structure, it is characterised in that: described anti-
The elongated grouting nozzle (8) for being welded with blossom type arrangement of rectangular steel pipe (6) inner wall used in sliding pile (3), rectangular steel pipe (6) is perpendicular to tunnel
The side wall of road (2) wiring direction also opens up circular hole, and circular hole is located at shallow embedding side friction pile (3) stake top or less, more than operation platform, together
Circular hole in one section on buried rectangular steel pipe (6) is located in the same horizontal plane with the circular hole on shallow embedding side rectangular steel pipe (6).
3. Unevenly-pressured shallow tunnel rock crusher section according to claim 1 excavates safeguard structure, it is characterised in that: the work
Word steel (5) model I56a ~ I63c, the edge of a wing is apart from rectangular steel pipe (6) far from tunnel (2) 20 ~ 30cm of side, web and tunnel
(2) trend is vertical and is overlapped with rectangular steel pipe (6) center line.
4. Unevenly-pressured shallow tunnel rock crusher section according to claim 1 excavates safeguard structure, it is characterised in that: the circle
Open up that Circularhole diameter is identical, and both ends are welded with circular cover (11) on shape steel pipe (7) outer diameter and rectangular steel pipe (6), inner wall is logical
The long grouting nozzle (8) for being welded with blossom type arrangement.
5. Unevenly-pressured shallow tunnel rock crusher section according to claim 1 excavates safeguard structure, it is characterised in that: the note
Starching mouth (8) is arc-shaped round tube, and circular arc internal diameter is 10 ~ 20cm, and round tube diameter is 2 ~ 3cm.
6. Unevenly-pressured shallow tunnel rock crusher section according to claim 1 excavates safeguard structure, it is characterised in that: described oblique
Beam (9) deck-molding is equal to the height that friction pile (3) exceed slope surface, wide equal with friction pile (3) width.
7. Unevenly-pressured shallow tunnel rock crusher section according to claim 4 excavates safeguard structure, it is characterised in that: the circle
Shape cover board (11) diameter is equal to the diameter of round steel pipe (7), and center weld has grouting nozzle (8).
8. the construction method of Unevenly-pressured shallow tunnel rock crusher section excavation safeguard structure, which is characterized in that its construction procedure are as follows:
(1) prefabricated components: the rectangular steel pipe that is prefabricated in the factory (6), round steel pipe (7), circular cover (11) and plugging plate (13)；Square
The elongated grouting nozzle (8) for being welded with blossom type arrangement of shape steel pipe (6) inner wall, opens up circular hole in rectangular steel pipe (6) short side two sidewalls；
The elongated grouting nozzle (8) for being welded with blossom type arrangement of round steel pipe (7) inner wall；The diameter of circular cover (11) is equal to round steel pipe
(7) diameter, center weld grouting nozzle (8)；Plugging plate (13) is circular steel plate；
(2) solid layer (10) construction is starched in stake side: excavating rectangle stake holes in two lateral edge wiring direction of tunnel (2) outline excavation, side is excavated
Rectangular steel pipe (6) are inserted on side, until stake end stretch enters in slide surface stable rock stratum below, through setting in rectangular steel pipe (6)
Grouting nozzle (8) on wall forms on the outside of rectangular steel pipe (6) to rectangular steel pipe (6) outside pressure slip casting and starches solid layer (10)；
(3) operation platform excavates: Rock And Soil is excavated on the outside of shallow embedding side friction pile (3), and an operation platform is formed on the outside of stake,
The absolute altitude of operation platform is lower than shallow embedding side friction pile (3) 4 ~ 5m of stake top absolute altitude；
(4) grouting and reinforcing coupling beam (4) is constructed: circular hole is reserved along shallow embedding side rectangular steel pipe (6) to massif (1) inner excavation level
Stake holes is inserted into round steel pipe (7) when excavating, and round steel pipe (7) sequentially passes through shallow embedding side rectangular steel pipe (6), massif (1), and
Protrude into same section in buried side rectangular steel pipe (6), guarantee round steel pipe (7) both ends be inserted into 0.5 in rectangular steel pipe (6) respectively ~
1.0m；It is formed in the grouting nozzle (8) of round steel pipe (7) inner wall to round steel pipe (7) outside pressure slip casting by setting and starches solid layer
(10), circular cover (11) are welded at round steel pipe (7) both ends, by be arranged grouting nozzle (8) on circular cover (11) to
Injection concrete forms grouting and reinforcing coupling beam (4) in steel pipe；
(5) friction pile (3) pours: blocking rectangle at the circular hole being welded on the outside of shallow embedding side rectangular steel pipe (6) with plugging plate (13)
Steel pipe (6), rectangular steel pipe (6) is interior to be inserted into I-steel (5), and I-steel (5) edge of a wing is apart from rectangular steel pipe (6) far from tunnel (2) one
20 ~ 30cm of side, web is vertical with tunnel (2) trend and is overlapped with rectangular steel pipe (6) center line；Then in rectangular steel pipe (6)
Casting concrete forms friction pile (3), and stake top absolute altitude is above ground level；
(6) cant beam (9) applies: slope surface being flattened, along slope surface formwork and assembling reinforcement, casting concrete forms cant beam (9)；
(7) tunnel excavation is constructed: friction pile (3) and grouting and reinforcing coupling beam (4) to all sections apply completion and meet design
After intensity requirement, the tunneling (2) in the closed area that friction pile (3) and grouting and reinforcing coupling beam (4) are formed；
(8) mini pile (12) and lining construction: high-pressure rotary spraying method is used to form mini pile in constructing tunnel in tunneling
(12), after completing the construction that the section shallow unsymmetrial loading tunnel rock crusher section excavates safeguard structure, lining cutting is applied；
(9) safeguard structure is excavated according to step (2) ~ step (8) construction next section Unevenly-pressured shallow tunnel rock crusher section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015853.0A CN108150190B (en) | 2018-01-08 | 2018-01-08 | Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015853.0A CN108150190B (en) | 2018-01-08 | 2018-01-08 | Unevenly-pressured shallow tunnel rock crusher section excavates safeguard structure and construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108150190A CN108150190A (en) | 2018-06-12 |
| CN108150190B true CN108150190B (en) | 2019-08-13 |
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| CN109296385A (en) * | 2018-10-23 | 2019-02-01 | 杭州市市政工程集团有限公司 | A kind of reinforcement means of the large span mountain tunnel hole top soil body |
| CN109811773B (en) * | 2019-03-01 | 2023-12-26 | 中铁十九局集团第五工程有限公司 | Bias tunnel portal excavation protection structure and construction method thereof |
| CN110043271A (en) * | 2019-05-21 | 2019-07-23 | 福建工程学院 | A kind of hole Shallow-buried section spaces union supporting construction and its construction method |
| CN110258536B (en) * | 2019-06-19 | 2024-07-23 | 山东省地矿工程勘察院(山东省地质矿产勘查开发局八〇一水文地质工程地质大队) | Opposite-pulling anchor cable structure for reducing bias load and construction method |
| CN114320405B (en) * | 2022-01-06 | 2024-05-14 | 重庆交通大学 | Tunnel ultra-shallow buried broken surrounding rock artificial arching supporting system and method |
| CN115478565B (en) * | 2022-10-11 | 2024-01-23 | 中铁四局集团有限公司 | Excavation construction process for fully weathered V-level rock shallow tunnel |
| CN117052421B (en) * | 2023-10-13 | 2024-01-09 | 湖南省通盛工程有限公司 | Tunnel portal supporting structure in deep slippage and large bias state and construction method |
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| GB190813189A (en) * | 1908-06-20 | 1909-02-11 | Jens Knudsen | Improved Method of Tunnelling Under Streets, Roads, Squares, Tracks and the like Surfaces of the Ground. |
| CN105840207B (en) * | 2016-03-24 | 2020-04-28 | 杭州江润科技有限公司 | Construction method for comprehensive tunnel entering structure of large-span tunnel penetrating shallow-buried bias-pressure loose accumulation body |
| CN106193082A (en) * | 2016-07-14 | 2016-12-07 | 中铁五局集团有限公司 | Stake raft construction technology in a kind of Shallow-buried soft plastomer Karst Tunnel |
| CN106223989B (en) * | 2016-08-10 | 2018-01-16 | 兰州理工大学 | Excavate safeguard structure and construction method in unsymmetrial loading tunnel hole |
| CN106499413B (en) * | 2016-11-19 | 2018-09-21 | 中铁十二局集团有限公司 | A kind of Shallow-buried section tunnel stratum consolidation construction method |
| KR101750908B1 (en) * | 2017-02-01 | 2017-06-29 | 한국건설기술연구원 | System of the shotcrete lining reinforced the adhesion/tension by wire mesh and assembly structure thereof and method setting up the wire mesh to the steel rib for tunnel |
| CN206785409U (en) * | 2017-06-13 | 2017-12-22 | 中交三公局桥梁隧道工程有限公司 | A kind of unsymmetrial loading tunnel |
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