CN219772980U - Underground combined supporting structure of deep foundation pit adjacent building - Google Patents
Underground combined supporting structure of deep foundation pit adjacent building Download PDFInfo
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- CN219772980U CN219772980U CN202223293724.9U CN202223293724U CN219772980U CN 219772980 U CN219772980 U CN 219772980U CN 202223293724 U CN202223293724 U CN 202223293724U CN 219772980 U CN219772980 U CN 219772980U
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- piles
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- 238000002955 isolation Methods 0.000 claims abstract description 46
- 239000011150 reinforced concrete Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 23
- 239000002689 soil Substances 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 11
- 238000009412 basement excavation Methods 0.000 abstract description 7
- 230000002787 reinforcement Effects 0.000 description 8
- 239000004567 concrete Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
An underground combined supporting structure of a deep foundation pit adjacent building comprises an underground continuous wall, isolation piles, sleeve valve pipes, crown beams and pull beams. Sleeve valve pipes are pre-buried between the underground diaphragm wall and the isolation piles, crown beams are arranged at the tops of the underground diaphragm wall, the tops of adjacent isolation piles are connected by the crown beams, and pull beams are used for connecting the crown beams of the underground diaphragm wall and the crown beams of the isolation piles, so that the underground diaphragm wall-isolation pile combined supporting structure is formed. During construction, the isolation piles and the crown beams are firstly constructed, and then the underground diaphragm wall and the crown beams are constructed. By adopting the method, the deformation of soil bodies inside and outside the pit and the additional deformation of adjacent buildings can be effectively controlled, and the safety of the deep foundation pit adjacent to the buildings during excavation is protected.
Description
Technical Field
The utility model relates to the technical field of foundation pit support, in particular to an underground combined support structure of a deep foundation pit adjacent building.
Background
Subway stations are usually built in urban building dense areas, in the process of subway station construction, the disturbance effect of excavation of station foundation pits can influence surrounding buildings, and if a foundation pit supporting method is unreasonable, deformation and damage of the surrounding buildings can be possibly caused. The past accidents caused by the failure of a plurality of deep foundation pit supporting structures show that the reliability of the subway foundation pit supporting method is important to ensuring the stability of surrounding buildings. The search for effective deep foundation pit supporting structures to ensure the safety of surrounding buildings has become a focus of attention in the subway foundation pit engineering construction process.
Disclosure of Invention
In order to seek an effective deep foundation pit supporting structure to ensure the safety of surrounding buildings, the utility model combines the characteristic advantages of underground continuous walls and isolation piles to provide an underground combined supporting structure of a deep foundation pit adjacent to a building.
In order to achieve the above object, the present utility model has the technical scheme that: the underground combined supporting structure of the deep foundation pit adjacent building comprises the following components of an underground continuous wall, isolation piles, sleeve valve pipes, crown beams and pull beams, wherein the concrete structure and the connection relation of the components are as follows: sleeve valve pipes are pre-buried between the underground diaphragm wall and the isolation piles, the isolation piles are reinforced concrete bored piles, the type is round piles, crown beams are arranged at the tops of the underground diaphragm walls, the tops of adjacent isolation piles are connected through the crown beams, and then the crown beams of the underground diaphragm wall and the crown beams of the isolation piles are connected through the pull beams, so that an integral underground diaphragm wall-isolation pile combined supporting structure is formed.
The pile length of the isolation pile is 22.5m, the pile diameter and the distance between the isolation piles are 800mm and 1000mm respectively, and the isolation piles are arranged at the position 2m away from the underground diaphragm wall outside the foundation pit.
The underground diaphragm wall is made of reinforced concrete, the thickness of the wall body of the underground diaphragm wall is 800mm, and the insertion depth is 33m.
The beam material is reinforced concrete, the section size is 400 multiplied by 800mm, and the distance between adjacent beams is 6m.
The crown beam material is reinforced concrete, and the cross section size is 800 multiplied by 800mm.
And the sleeve valve pipe is filled with cement-water glass double-liquid slurry, and the length of the pipe body is 6m.
Compared with the prior art, the utility model has the advantages that:
1. the application range is wide, the construction of the isolation pile-underground continuous wall foundation pit combined supporting structure has small disturbance to the soil body of the foundation pit excavation site, and the combined supporting structure is suitable for various soil layers.
2. The construction safety is improved, and the possibility of occurrence of construction accidents of the deep foundation pit is reduced. Because the foundation pit supporting and excavating technology is complex, the method has wide range of relation and multiple variation factors, and is the most challenging technical difficulty in the construction engineering. After the isolation pile-underground continuous wall foundation pit combined supporting structure is formed, the rigidity is high, and the integrity is good. During excavation of the foundation pit, the combined support is small in deformation, soil body bulge in the pit can be effectively reduced, soil body sedimentation and soil body lateral displacement after the pit are reduced, disturbance to adjacent buildings of the foundation pit can be further reduced, and additional deformation of the adjacent buildings caused by foundation pit construction is effectively reduced.
3. The construction efficiency is improved, and the construction period delay caused by improper construction method is avoided. By selecting a proper foundation pit support design method and construction technology, the problems of reworking and the like can be effectively avoided, the construction progress is ensured, and the economic loss caused by the problem of construction efficiency is avoided. During construction of the isolation pile, the underground diaphragm wall reinforcement cage can be manufactured, the site construction efficiency is improved, and the construction period is shortened.
4. The construction cost is saved, and the waste caused by improper design method and construction technology selection, improper control of construction process and improper treatment of reinforcement measures is reduced.
Drawings
Fig. 1 is a three-dimensional schematic perspective view of an underground joint support structure of a deep foundation pit adjacent building according to the present utility model.
Fig. 2 is a plan view of an underground joint support structure of a deep foundation pit adjacent to a building according to the present utility model.
Marked in the figure as: the building construction system comprises an isolation pile 1, an underground diaphragm wall 2, a pull beam 3, a sleeve valve pipe 4, an isolation pile crown beam 5, an underground diaphragm wall crown beam 6, an inner support 7 and an adjacent building 8.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1 and 2, the underground combined supporting structure of the deep foundation pit adjacent to a building comprises the following components: the top of the underground diaphragm wall 2 is provided with a crown beam, a sleeve valve pipe 4 is pre-buried between the underground diaphragm wall 2 and the isolation pile 1, the isolation pile 1 is a reinforced concrete bored pile, the type is a round pile, and a crown beam 5 of the isolation pile 1 and a crown beam 6 of the underground diaphragm wall 2 are connected through a pull beam 3 to form an integral underground diaphragm wall isolation pile combined supporting structure.
Example 2
The application example of the underground combined supporting structure of the deep foundation pit adjacent building is carried out according to the following construction steps:
(1) Arranging 1 row of isolation piles 1 phi 800@1000 at the position 2 meters outside the underground diaphragm wall 2 of the foundation pit, drilling and processing reinforcement cages by the isolation piles 1, arranging the reinforcement cages by the isolation piles, chiseling off pile heads of the isolation piles 1, binding reinforcement bars of isolation pile crown beams 5, and connecting adjacent isolation piles 1 by adopting 800X 800mm isolation pile crown beams 5 to form an integrated soil retaining structure as a reinforcing measure;
(2) Constructing underground diaphragm walls 2 with the thickness of 0.8m along the periphery of a foundation pit, pouring guide walls, processing reinforcement cages of the underground diaphragm walls 2, performing grooving construction, adopting C35 underwater concrete and water-stop curtains, constructing underground diaphragm wall crown beams 6, performing pile head slurry treatment on the underground diaphragm walls 2, manually breaking the wall heads of the underground diaphragm walls 2, straightening reserved reinforcement bars, and anchoring the reinforcement bars of the underground diaphragm walls 2 into the underground diaphragm wall crown beams 6;
(3) The sleeve valve pipe 4 is drilled, grouting is carried out on the sleeve valve pipe 4 of the 1 row is pre-buried between the underground diaphragm wall 2 and the isolation pile 1, cement-water glass double-oar liquid tracking grouting is adopted, the foundation is reinforced, the risk of lateral shifting caused by soil stress loss is further reduced, the lateral deformation of the soil is effectively prevented, and the safety of surrounding buildings is ensured;
(4) And the construction bracing beam is connected with the underground continuous wall crown beam 6 and the isolation pile crown beam 5 to form a combined supporting structure, so that the structural integrity is improved.
(5) Pavement concrete is broken, earthwork is excavated layer by layer, and the first, second and third inner supports 7 are constructed, so that the deformation resistance of the structure is improved.
Working principle and process:
the unloading process of the excavation surface of the foundation pit can cause stress release of soil in the pit, the pressure difference between the inside and the outside of the pit is increased, the soil in the pit is raised, the soil outside the pit is settled to different degrees, the settlement of the long side of the foundation pit is larger than the settlement of the short side, an obvious constraint effect exists at the corner point of the foundation pit, and the soil settlement at the corner point is obviously smaller than other parts. Aiming at the soil body sliding deformation caused by excavation, the local underground diaphragm wall-isolation pile combined supporting structure penetrates through a soil body sliding surface to be embedded into a deep soil body, and the deformation of the soil body inside and outside the pit is restrained by improving the shearing resistance of the sliding surface and the pile side resistance provided by the pile body of the isolation pile. The soil body in the pit is removed, so that the soil pressure and the water pressure outside the combined supporting structure are obviously greater than the pressure inside the combined supporting structure, the combined supporting structure generates deformation, the lateral displacement of the combined supporting structure points to the pit, the deformation of the two ends of the underground diaphragm wall is small, the deformation of the middle part of the underground diaphragm wall is large, the distance between the isolation piles is further, and the deformation of the pile body is slightly smaller than that of the underground diaphragm wall. The integral deformation of the combined support is small and far smaller than the standard limit value, and the good stress system can reduce the interaction of soil bodies on two sides of the support structure, so that the influence of soil disturbance on the adjacent foundation pit building is reduced, and the safety of the adjacent building during excavation is ensured.
Although the utility model has been described above with reference to the accompanying drawings, the utility model is not limited to the above-described embodiments, which are given by way of illustration only and not by way of limitation, and other modifications can be made by those skilled in the art without departing from the scope of the utility model, which is intended to be included in the protection of the utility model.
Claims (6)
1. The underground combined supporting structure of the deep foundation pit adjacent building is characterized in that the component members comprise underground continuous walls, isolation piles, sleeve valve pipes, crown beams and pull beams, and the specific structure and the connection relation of the component members are as follows: sleeve valve pipes are pre-buried between the underground diaphragm wall and the isolation piles, the isolation piles are reinforced concrete bored piles, the type is round piles, crown beams are arranged at the tops of the underground diaphragm walls, the tops of adjacent isolation piles are connected through the crown beams, and then the crown beams of the underground diaphragm wall and the crown beams of the isolation piles are connected through the pull beams, so that an integral underground diaphragm wall-isolation pile combined supporting structure is formed.
2. The underground combined supporting structure of the deep foundation pit adjacent to the building according to claim 1, wherein the pile length of the isolation piles is 22.5m, the pile diameter and the distance between the isolation piles are 800mm and 1000mm respectively, and the isolation piles are arranged at the position 2m away from the underground continuous wall outside the foundation pit.
3. The underground joint support structure of the deep foundation pit adjacent building according to claim 1, wherein the underground diaphragm wall material is reinforced concrete, the thickness of the underground diaphragm wall is 800mm, and the insertion depth is 33m.
4. The underground joint support structure of a deep foundation pit adjacent to a building according to claim 1, wherein the tie beam material is reinforced concrete, the cross-sectional dimension is 400 x 800mm, and the spacing between adjacent tie beams is 6m.
5. The underground joint support structure of a deep foundation pit adjacent building according to claim 1, wherein the crown beam material is reinforced concrete, and the cross-sectional dimension is 800 x 800mm.
6. The underground combined support structure of the deep foundation pit adjacent building according to claim 1, wherein the sleeve valve pipe is filled with cement-water glass double slurry, and the length of the pipe body is 6m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223293724.9U CN219772980U (en) | 2022-12-08 | 2022-12-08 | Underground combined supporting structure of deep foundation pit adjacent building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223293724.9U CN219772980U (en) | 2022-12-08 | 2022-12-08 | Underground combined supporting structure of deep foundation pit adjacent building |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219772980U true CN219772980U (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223293724.9U Active CN219772980U (en) | 2022-12-08 | 2022-12-08 | Underground combined supporting structure of deep foundation pit adjacent building |
Country Status (1)
| Country | Link |
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| CN (1) | CN219772980U (en) |
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2022
- 2022-12-08 CN CN202223293724.9U patent/CN219772980U/en active Active
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