Foundation pit slope trestle structure
By designing a sloping trestle bridge structure for the foundation pit, and using components such as cast-in-place piles and trestle walers to form a stepped structure, the limitations of using horizontal trestle bridges without undulations and the large amount of construction work were solved, achieving efficient construction and stable foundation pit protection.
Patent Information
- Application Number
- CN202520158360.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-01-22
AI Technical Summary
The existing foundation pit retaining system has problems such as limited application scope of horizontal trestle bridges without undulations, damage to soil structure, and large construction volume.
Design a foundation pit trestle structure, including a first slope, a second slope and the bottom of the foundation pit. By constructing cast-in-place piles, trestle walers, column piles and trestle supports, a stepped structure is formed to avoid site flatness and maintain the stability of the soil structure.
Reduce construction time, improve construction efficiency, maintain soil properties, enhance the stability of foundation pit support, reduce environmental impact, and save project costs.
Smart Images
Figure CN223893385U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geotechnical engineering technology, and in particular to a trestle structure for a foundation pit slope. Background Technology
[0002] In the current foundation pit support system, the most commonly used is the horizontal trestle bridge without undulations, which has the following problems:
[0003] First, the use of level trestle bridges without undulations is limited; they are only suitable for flat areas.
[0004] Secondly, the original soil structure will be damaged during the site leveling process, affecting the stability of the foundation pit retaining structure.
[0005] In addition, in areas with significant site undulations, the amount of earthwork required for site leveling increases, leading to a greater workload. Utility Model Content
[0006] In view of the above-mentioned prior art, the present invention provides a foundation pit slope trestle structure that does not require damage to the original soil structure and has a small damage range.
[0007] To achieve the above objectives, the technical solution of this utility model embodiment is implemented as follows:
[0008] A trestle bridge structure for a foundation pit slope includes a first slope, a second slope, and a foundation pit bottom. Several first cast-in-place piles are cast along the edge of the first slope, and a first trestle bridge waler is cast on top of each first cast-in-place pile. Several second cast-in-place piles are cast along the edge of the second slope, and a second trestle bridge waler is cast on top of each second cast-in-place pile. Three rows of vertical column piles are installed at the bottom of the foundation pit. The three rows of column piles are arranged in a stepped pattern from high to low. Trestle bridge supports are cast between the tops of the three rows of column piles. The first and second trestle bridge walers are connected to the tops of adjacent column piles by identical trestle bridge supports. A trestle bridge slab is cast on the top surface of the trestle bridge supports.
[0009] Furthermore, boreholes are provided at the bottom of the foundation pit, and the column piles include a third cast-in-place pile and a steel lattice column. The third cast-in-place pile is poured into the borehole, and the bottom of the steel lattice column is poured together with the third cast-in-place pile. The top of the steel lattice column is poured together with the trestle support.
[0010] Furthermore, a concrete waler is poured on the side of the first cast-in-place pile away from the first slope. The concrete waler is at the same elevation as the second trestle waler. A waler support is poured between the concrete waler, the steel lattice column, and the second trestle waler. The waler support is poured and connected to the trestle support on one side of the second trestle waler.
[0011] Furthermore, the upper surface of the trestle deck is provided with anti-slip texture.
[0012] Furthermore, the cross-sectional shape of the first and second cast-in-place piles is circular.
[0013] Furthermore, the elevations of the first trestle waler and the first slope are level, and a cover plate is installed at the junction of the upper surfaces of the first trestle waler and the first slope. The elevations of the second trestle waler and the second slope are level, and the same cover plate is installed at the junction of the upper surfaces of the second trestle waler and the second slope.
[0014] Furthermore, the diameter of the steel lattice column is smaller than the width of the trestle support and the waler support. The trestle support wraps around the top of the steel lattice column during casting, and the steel lattice column passes through the waler support and is fixedly connected.
[0015] Furthermore, the trestle deck has a pouring thickness of 250mm and is equipped with a two-way steel reinforcement structure.
[0016] The beneficial effects of this utility model are as follows: by pouring a construction sloping trestle bridge in the middle of the foundation pit retaining structure at different heights, the leveling work of undulating sites is avoided, construction time is reduced, construction efficiency is improved, the original soil properties are maintained without leveling undulating sites, the stability of the foundation pit retaining structure is improved, the impact of earthwork excavation on the surrounding environment is reduced, the layout of site access roads is reduced, and project costs are saved. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the foundation pit slope trestle structure of this utility model;
[0018] Figure 2 This is a three-dimensional schematic diagram of the foundation pit slope trestle structure of this utility model.
[0019] Explanation of reference numerals in the attached drawings: 1. First cast-in-place pile; 2. Concrete waler; 3. Waler support; 4. First trestle waler; 5. Trestle support; 6. First slope; 7. Second slope; 8. Drill hole; 9. Pit bottom; 10. Column pile; 11. Second trestle waler; 12. Trestle deck; 13. Third cast-in-place pile; 14. Second cast-in-place pile; 15. Steel lattice column; 16. Cover plate. Detailed Implementation
[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in this specification of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.
[0021] Combined with reference to the appendix Figures 1 to 2 This utility model provides a foundation pit slope trestle structure, including a first slope 6, a second slope 7, and a foundation pit bottom 9. Several first cast-in-place piles 1 are cast at the edge of the first slope 6, and a first trestle waler 4 is cast at the top of the first cast-in-place piles 1. Several second cast-in-place piles 14 are cast at the edge of the second slope 7, and a second trestle waler 11 is cast at the top of the second cast-in-place piles 14. Three rows of vertical column piles 10 are provided at the foundation pit bottom 9. The three rows of column piles 10 are arranged in a stepped shape from high to low. Trestle supports 5 are cast between the tops of the three rows of column piles 10. The same trestle supports 5 are cast between the tops of the first trestle waler 4, the second trestle waler 11, and the adjacent column piles 10. A trestle plate 12 is cast on the top surface of the trestle support 5. Several first cast-in-place piles 1 are poured at the first slope 6 to block and intercept soil outside the foundation pit. The top of the first cast-in-place piles 1 is connected to the first trestle waler 4 by steel reinforcement binding and concrete pouring. Several second cast-in-place piles 14 are poured at the second slope 7 to block and intercept soil outside the foundation pit. The top of the second cast-in-place piles 14 is connected to the second trestle waler 11 by steel reinforcement binding and concrete pouring. Three rows of column piles 10 are vertically erected on the bottom 9 of the foundation pit, with the height of the column piles 10 gradually decreasing from the first cast-in-place piles 1 to the second cast-in-place piles 14. Trestle supports 5 are poured between the first trestle waler 4, the second trestle waler 11 and the column piles 10. Adjacent trestle supports 5 are connected by steel reinforcement binding and concrete pouring. Finally, trestle slabs 12 for vehicle passage are poured on the top surface of the trestle supports 5, connecting the first trestle waler 4 and the second trestle waler 11 to form a sloping trestle bridge.
[0022] Preferably, the bottom of the foundation pit 9 is provided with a borehole 8, and the column pile 10 includes a third cast-in-place pile 13 and a steel lattice column 15. The third cast-in-place pile 13 is cast into the borehole 8, and the bottom of the steel lattice column 15 is cast together with the third cast-in-place pile 13. The top of the steel lattice column 15 is cast together with the trestle support 5. The borehole 8 is excavated in the bottom of the foundation pit 9 along the direction of the column pile 10. The bottom of the steel lattice column 15 enters the borehole 8, and the third cast-in-place pile 13 is cast into the borehole 8, so that the steel lattice column 15 is firmly fixed to the bottom of the foundation pit 9. The top of the steel lattice column 15 is connected to the trestle support 5 by means of steel bar binding and concrete pouring, which provides stable support for the trestle support 5 above.
[0023] Preferably, a concrete waler 2 is poured on the side of the first cast-in-place pile 1 away from the first slope 6. The concrete waler 2 is at the same elevation as the second trestle waler 11. A waler support 3 is poured between the concrete waler 2, the steel lattice column 15, and the second trestle waler 11. The waler support 3 is poured and connected to the trestle support 5 on one side of the second trestle waler 11. The concrete waler 2 is poured on the first cast-in-place pile 1, and the concrete waler 2 is at the same elevation as the second trestle waler 11. The waler support 3 is poured between the concrete waler 2 and the second trestle waler 11. The waler support 3 is connected to the steel lattice column 15 by steel reinforcement binding and concrete pouring. The waler support 3 provides horizontal support and fixation for the steel lattice column 15.
[0024] Preferably, the upper surface of the trestle 12 is provided with anti-slip texture. The anti-slip texture is constructed on the upper surface of the trestle 12 during the pouring and construction process to prevent vehicles from slipping during passage.
[0025] Preferably, the cross-sectional shape of the first cast-in-place pile 1 and the second cast-in-place pile 14 is circular. They are formed by drilling, lowering the steel cage, and pouring concrete, which is convenient for construction and has a solid structure. They provide solid support for the first trestle waler 4 above the first cast-in-place pile 1 and the second trestle waler 11 above the second cast-in-place pile 14, and can prevent soil landslides.
[0026] Preferably, the elevations of the first trestle waler 4 and the first slope 6 are flush, and a cover plate 16 is provided at the junction of the upper surfaces of the first trestle waler 4 and the first slope 6. The elevations of the second trestle waler 11 and the second slope 7 are flush, and the same cover plate 16 is provided at the junction of the upper surfaces of the second trestle waler 11 and the second slope 7. With the elevations of the first trestle waler 4 and the first slope 6, and the elevations of the second trestle waler 11 and the second slope 7, no additional construction is required for leveling, saving materials. The cover plate 16 effectively prevents excessive pressure on the tires of passing vehicles at the edges of the first trestle waler 4 and the second trestle waler 11.
[0027] Preferably, the diameter of the steel lattice column 15 is smaller than the width of the trestle support 5 and the waler support 3. The trestle support 5 is poured to enclose the top of the steel lattice column 15, and the steel lattice column 15 passes through the waler support 3 and is fixedly connected. Through the connection formed by steel bar binding and concrete pouring, the trestle support 5 and the waler support 3 are firmly connected to the steel lattice column 15, effectively preventing the trestle support 5 and the waler support 3 from sliding downward.
[0028] Preferably, the pouring thickness of the trestle deck 12 is 250mm, and the trestle deck 12 is equipped with a two-way steel reinforcement structure. This ensures that the load-bearing capacity of the trestle deck 12 meets the requirements and guarantees safety.
[0029] Working principle: Several first cast-in-place piles 1 are poured at the first slope 6 at the edge of the foundation pit. The elevation of the first cast-in-place piles 1 is lower than that of the first slope 6. Several second cast-in-place piles 14 are poured at the second slope 7 at the edge of the foundation pit. The elevation of the second cast-in-place piles 14 is lower than that of the second slope 7. The first trestle waler 4 is poured on the top surface of the first cast-in-place piles 1, and the second trestle waler 11 is poured on the top surface of the second cast-in-place piles 14 simultaneously. Several boreholes 8 are excavated on the bottom 9 of the foundation pit between the first cast-in-place piles 1 and the second cast-in-place piles 14. The third cast-in-place piles 13 are constructed in the boreholes 8, and the bottom of the steel lattice column 15 is poured into the third cast-in-place piles 13. The first trestle waler 4 and the second trestle waler 14 are then constructed. A trestle support 5 is poured between the purlins 11. The top of the steel lattice column 15 is poured inside the trestle support 5 and supported and fixed by steel bar binding and concrete pouring. A concrete waler 2 is poured inside the first cast-in-place pile 1. The concrete waler 2 is level with the elevation of the second trestle waler 11. A waler support 3 is poured between the concrete waler 2 and the second trestle waler 11. The trestle support 5 on the side closer to the second cast-in-place pile 14 is poured through the waler support 3 to horizontally support the column pile 10. The trestle support 5 is poured around the top of the steel lattice column 15 and is bound with steel bars. The steel lattice column 15 passes through the waler support 3 and is fixedly connected. Finally, a trestle slab 12 is poured on the trestle support 5.
[0030] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model should be determined by the protection scope of the stated claims.
Claims
1. A trestle bridge structure for a foundation pit slope, comprising a first slope (6), a second slope (7), and a foundation pit bottom (9), characterized in that: Several first cast-in-place piles (1) are poured at the edge of the first slope (6), and a first trestle waler (4) is poured at the top of the first cast-in-place piles (1). Several second cast-in-place piles (14) are poured at the edge of the second slope (7), and a second trestle waler (11) is poured at the top of the second cast-in-place piles (14). Three rows of vertical column piles (10) are set at the bottom of the foundation pit (9). The three rows of column piles (10) are arranged in a stepped manner from high to low. Trestle supports (5) are poured between the tops of the three rows of column piles (10). The same trestle supports (5) are poured between the tops of the first trestle waler (4) and the second trestle waler (11) and the tops of the adjacent column piles (10). Trestle slabs (12) are poured on the top surface of the trestle supports (5).
2. The foundation pit sloping trestle bridge structure according to claim 1, characterized in that: The bottom (9) of the foundation pit is provided with a borehole (8). The column pile (10) includes a third cast-in-place pile (13) and a steel lattice column (15). The third cast-in-place pile (13) is cast in the borehole (8). The bottom of the steel lattice column (15) is cast together with the third cast-in-place pile (13). The top of the steel lattice column (15) is cast together with the trestle support (5).
3. The foundation pit sloping trestle bridge structure according to claim 2, characterized in that: A concrete waler (2) is poured on the side of the first cast-in-place pile (1) away from the first slope (6). The concrete waler (2) is level with the second trestle waler (11). A waler support (3) is poured between the concrete waler (2), the steel lattice column (15), and the second trestle waler (11). The waler support (3) is poured through the trestle support (5) on one side of the second trestle waler (11).
4. The foundation pit sloping trestle bridge structure according to claim 1, characterized in that: The upper surface of the trestle plate (12) is provided with anti-slip texture.
5. The foundation pit sloping trestle bridge structure according to claim 1, characterized in that: The cross-sectional shape of the first cast-in-place pile (1) and the second cast-in-place pile (14) is circular.
6. The foundation pit sloping trestle bridge structure according to claim 1, characterized in that: The first trestle waler (4) and the first slope (6) are at the same elevation. A cover plate (16) is provided at the junction of the upper surfaces of the first trestle waler (4) and the first slope (6). The second trestle waler (11) and the second slope (7) are at the same elevation. The same cover plate (16) is provided at the junction of the upper surfaces of the second trestle waler (11) and the second slope (7).
7. The foundation pit sloping trestle bridge structure according to claim 3, characterized in that: The diameter of the steel lattice column (15) is smaller than the width of the trestle support (5) and the waler support (3). The trestle support (5) wraps around the top of the steel lattice column (15) for casting. The steel lattice column (15) passes through the waler support (3) and is fixedly connected.
8. The foundation pit sloping trestle bridge structure according to claim 1, characterized in that: The thickness of the trestle slab (12) is 250mm, and the trestle slab (12) is provided with a two-way steel reinforcement structure.