CN220791240U - Subway tunnel top excavation supporting construction - Google Patents
Subway tunnel top excavation supporting construction Download PDFInfo
- Publication number
- CN220791240U CN220791240U CN202322778571.5U CN202322778571U CN220791240U CN 220791240 U CN220791240 U CN 220791240U CN 202322778571 U CN202322778571 U CN 202322778571U CN 220791240 U CN220791240 U CN 220791240U
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- Prior art keywords
- peripheral frame
- reinforcing layer
- utility
- tunnel
- excavation supporting
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 33
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 32
- 230000002093 peripheral effect Effects 0.000 claims abstract description 22
- 239000002689 soil Substances 0.000 claims abstract description 19
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 abstract description 3
- 239000004568 cement Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model relates to an excavation supporting structure above a subway tunnel, which comprises a peripheral frame, a first reinforcing layer and a second reinforcing layer, wherein the peripheral frame is used for being vertically driven into soil around a position to be excavated, the first reinforcing layer is filled in the peripheral frame, the second reinforcing layer is filled in the peripheral frame and is positioned above the first reinforcing layer, the peripheral frame is formed by surrounding a plurality of vertically arranged guard piles, and two adjacent guard piles are mutually overlapped and fixed. The first reinforcement layer is formed by overlapping and fixing a plurality of first vertical piles which are arranged in a matrix manner. The utility model solves the technical problem that in the prior art, soil excavation is carried out above the existing tunnel to cause the uplift of the segment of the underground tunnel, so that the tunnel structure is damaged. The utility model adopts the MJS construction method pile to effectively control the internal stress of the soil body, reduce the extrusion of grouting reinforcement to the pipe piece and influence the deformation of the pipe piece; the section steel in the fender post can strengthen the integral rigidity of the MJS construction method post and has the capacity of cantilever supporting and retaining earth.
Description
Technical Field
The utility model relates to the field of civil engineering, in particular to an excavation supporting structure above a subway tunnel.
Background
Along with the development and promotion of urban areas, more and more cities start to develop underground spaces, subway tunnels are built, and mutually staggered underground transportation networks are formed. The construction is affected by the construction land, the construction such as building a ramp or installing a pipe culvert is required to excavate a shallow foundation pit with a certain depth (3-4 m) above the existing tunnel, and the soil unloading operation during excavation of a foundation pit can possibly cause the bulge of the underground tunnel segment, so that the tunnel structure is damaged and other risks are caused.
Disclosure of utility model
Aiming at the defects in the prior art, the utility model provides a supporting structure for excavating above a subway tunnel, which solves the technical problem that the tunnel structure is damaged because the underground tunnel segment is raised due to soil excavation above the existing tunnel in the prior art.
The utility model discloses an excavation supporting structure above a subway tunnel, which comprises a peripheral frame, a first reinforcing layer and a second reinforcing layer, wherein the peripheral frame is used for being vertically driven into soil around a position to be excavated, the first reinforcing layer is filled in the peripheral frame, the second reinforcing layer is filled in the peripheral frame and is positioned above the first reinforcing layer, the peripheral frame is formed by surrounding a plurality of vertically arranged guard piles, and two adjacent guard piles are mutually overlapped and fixed.
The utility model further improves the excavation supporting structure above the subway tunnel, wherein the first reinforcing layer is formed by a plurality of first vertical piles which are arranged in a matrix, and the adjacent first vertical piles are mutually overlapped and fixed.
The utility model discloses a further improvement of an excavation supporting structure above a subway tunnel, which is characterized in that the first vertical pile is an MJS construction method pile.
The utility model further improves the excavation supporting structure above the subway tunnel, wherein the second reinforcing layer is formed by a plurality of second vertical piles which are arranged in a matrix, and the adjacent second vertical piles are mutually overlapped and fixed.
The utility model further improves the excavation supporting structure above the subway tunnel in that the second vertical pile is an MJS construction method pile.
The utility model discloses a further improvement of an excavation supporting structure above a subway tunnel, which is characterized in that a fender pile is an MJS construction method pile, and section steel is arranged in the pile in a through length mode.
Compared with the prior art, the utility model has positive and obvious effects. According to the utility model, the peripheral frame, the first reinforcing layer and the second reinforcing layer are used for reinforcing soil around and below the tunnel to be excavated, so that the technical problem that in the prior art, when soil is excavated above an existing tunnel, the tunnel segment is raised, and the tunnel structure is damaged is solved. The utility model adopts the MJS construction method pile to effectively control the internal stress of the soil body, reduce the extrusion of grouting reinforcement to the pipe piece and influence the deformation of the pipe piece; the section steel in the fender post can strengthen the integral rigidity of the MJS construction method post and has the capacity of cantilever supporting and retaining earth.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a top view of an excavation supporting structure above a subway tunnel of the present utility model.
Fig. 2 is a sectional view of an excavation supporting structure above a subway tunnel of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1 and 2, the utility model provides an excavation supporting structure above a subway tunnel 1, which comprises a peripheral frame, a first reinforcing layer 5 and a second reinforcing layer 6, wherein the peripheral frame is used for being vertically driven into soil around a position to be excavated, the first reinforcing layer 5 is filled in the peripheral frame, the second reinforcing layer 6 is filled in the peripheral frame and is positioned above the first reinforcing layer 5, the peripheral frame is formed by surrounding a plurality of vertically arranged fender posts 2, and two adjacent fender posts 2 are mutually overlapped and fixed. In this embodiment, the cement content of the second reinforcing layer 6 is lower, the excavation of the foundation pit is directly performed in the second reinforcing layer 6, and since the soil body in the excavation area of the foundation pit is reinforced, the soil body around the foundation pit is reinforced, and the tunnel 1 below the foundation pit will not deform or bulge in the process of excavation. When the open water pumping and draining mode is adopted in the process of excavation, the interior of a foundation pit is completely reinforced, the water content of earthwork in an excavated area is reduced, if a precipitation mode is adopted outside the pit, the pipe piece is easy to bulge or sink and deform, and the open water pumping and draining can solve the problem of excavation precipitation.
Preferably, the first reinforcement layer 5 is formed by a plurality of first vertical piles arranged in a matrix, and adjacent first vertical piles are overlapped and fixed with each other. The first vertical piles and the enclosure piles 2 are also mutually overlapped and fixed, so that the first reinforcing layer 5 and the enclosure frame form a whole, and further soil stress is resisted together.
Preferably, the first vertical pile is an MJS job pile. The MJS construction method pile (Metro Jet SystemMJS, omnibearing high-pressure injection construction method) has the advantages of high construction speed, simple process and high construction quality, can fully fill the gaps in the rock soil, and improves the bearing capacity and stability of the foundation.
Preferably, the second reinforcement layer 6 is formed by a plurality of second vertical piles 4 arranged in a matrix, and adjacent second vertical piles 4 are overlapped and fixed with each other. The second vertical piles 4 and the enclosure piles 2 are also mutually overlapped and fixed, and the bottoms of the second vertical piles 4 are fixed with the first vertical piles, so that the second reinforcing layer 6, the enclosure frame and the first reinforcing layer 5 form a whole, and further soil stress is resisted jointly.
Preferably, the second vertical pile 4 is an MJS process pile.
Preferably, the fender post 2 is an MJS construction method post, and the pile is internally provided with profile steel 3 in a penetrating way. The first vertical piles, the second vertical piles 4 and the guard piles 2 are all constructed and operated conveniently by adopting MJS construction method piles, and meanwhile, the structures can be mutually overlapped and fixed more firmly. The section steel 3 in the pile can enhance the integral rigidity of the MJS pile, and has the capacity of cantilever supporting earth retaining under the condition that the excavation depth is not more than 4 m.
In the construction process, the excavation depth of the fender post 2 is designed according to the pipe piece burial depth of the subway tunnel 1 and the excavation depth needed above, and the elevation distance between the bottom of the fender post 2 and the upper surface of the tunnel 1 is not smaller than 8m. The fender post 2 adopts an MJS omnibearing high-pressure jet grouting pile and is internally provided with a section steel 3 as an earthwork retaining structure. The depth of the section steel 3 is the same as that of the fender post 2, the bottom end of the fender post 2 is 1.5-2 times of the depth of the excavation required downwards from the ground, the diameter of the fender post 2 is 2500mm, the cement mixing amount is 40%, and the lap joint length of two adjacent fender posts 2 is not less than 60cm.
After the construction of the fender post 2 is completed, the foundation is reinforced by adopting an MJS omnibearing high-pressure jet grouting pile in the pit, the cement doping amount of the second reinforcing layer 6 in the excavation surface area is 20%, the cement doping amount of the first reinforcing layer 5 in the area below the excavation surface is 40%. The overlap length is not less than 60cm and the diameter is 2500mm when the MJS construction method pile is constructed.
After the foundation is reinforced, the foundation can be excavated after the foundation is qualified in coring detection, the foundation pit is excavated in a clear water pumping and draining mode, no dewatering well is arranged, a drainage ditch 7 is arranged outside the pit, the foundation pit is excavated in the area of the second reinforcing layer 6, and the foundation pit is excavated and then is subjected to structural construction by sealing the bottom in time.
According to the utility model, the peripheral frame, the first reinforcing layer and the second reinforcing layer are used for reinforcing soil bodies in the surrounding area to be excavated and the area below the peripheral frame, so that the technical problem that in the prior art, when soil bodies are excavated above an existing tunnel, the segment of the underground tunnel is raised, and the tunnel structure is damaged is solved. The utility model adopts the MJS construction method pile to effectively control the internal stress of the soil body, reduce the extrusion of grouting reinforcement to the pipe piece and influence the deformation of the pipe piece; the section steel in the fender post can strengthen the integral rigidity of the MJS construction method post and has the capacity of cantilever supporting and retaining earth.
None of the utility models are related to the same or are capable of being practiced in the prior art. The present utility model is not limited to the above embodiments, but is capable of modification and variation in all aspects, including those of ordinary skill in the art, without departing from the spirit and scope of the present utility model.
Claims (6)
1. The utility model provides a subway tunnel top excavation supporting construction, its characterized in that is used for being around waiting to excavate the position and vertically driving the internal peripheral frame of soil, pack in the first reinforcement layer in the peripheral frame, and pack in the peripheral frame and be located the second reinforcement layer of first reinforcement layer top, the peripheral frame is enclosed by the vertical many fender posts that set up and is established and form, and two are adjacent overlap joint each other and fix between the fender post.
2. The underground tunnel top excavation supporting structure of claim 1, wherein the first reinforcement layer is formed by a plurality of first vertical piles arranged in a matrix, and adjacent first vertical piles are mutually overlapped and fixed.
3. The above-subway tunnel excavation supporting structure of claim 2, wherein the first vertical pile is an MJS method pile.
4. The underground tunnel top excavation supporting structure of claim 1, wherein the second reinforcing layer is formed by a plurality of second vertical piles arranged in a matrix, and adjacent second vertical piles are mutually overlapped and fixed.
5. The above-subway tunnel excavation supporting structure of claim 4, wherein the second vertical pile is an MJS method pile.
6. The underground tunnel top excavation supporting structure of claim 1, wherein the fender post is an MJS method post, and the through length of the post is provided with a section steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322778571.5U CN220791240U (en) | 2023-10-17 | 2023-10-17 | Subway tunnel top excavation supporting construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322778571.5U CN220791240U (en) | 2023-10-17 | 2023-10-17 | Subway tunnel top excavation supporting construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220791240U true CN220791240U (en) | 2024-04-16 |
Family
ID=90661815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322778571.5U Active CN220791240U (en) | 2023-10-17 | 2023-10-17 | Subway tunnel top excavation supporting construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220791240U (en) |
-
2023
- 2023-10-17 CN CN202322778571.5U patent/CN220791240U/en active Active
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