A top-down foundation pit supporting structure

Abstract

The utility model relates to the technical field of foundation pit support, concretely to a reverse construction method foundation pit support structure, including prefabricated straight wall and prefabricated corner wall, the surface of prefabricated straight wall and prefabricated corner wall is provided with splicing subassembly, splicing subassembly includes first lug, second lug, first grouting groove, first clamping groove, second clamping groove, reinforcing ring and second grouting groove, the inside of prefabricated straight wall and prefabricated corner wall all are provided with two groups of insertion slot, and the inside insertion slot is inserted with reinforcing component, a plurality of prefabricated straight wall and prefabricated corner wall interlock and cooperate, the construction of quick to underground continuous wall, improve construction progress, cooperate reinforcing component to further improve the structural strength of underground continuous wall, pour the inside of concrete from first grouting groove into second grouting groove, fill the gap between wall, improve the sealing of underground continuous wall, and the concrete of pouring and reinforcing ring cooperate further improve wall structure strength, and effectively reduce the concrete usage, improve environmental neatness.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, specifically to a reverse construction method foundation pit support structure. Background Technology

[0002] Foundation pit support is a crucial aspect of construction engineering, especially in deep foundation pit construction. The stability of the support structure directly affects the safety and construction efficiency of the project. Currently, foundation pit support technologies mainly include various forms such as pile support, diaphragm wall support, and soil nailing wall support. With the rapid development of urban construction, the development and utilization of underground space is increasing, leading to higher requirements for foundation pit support technology. The reverse construction method, as an advanced construction technique, has gradually become one of the mainstream methods for deep foundation pit construction due to its ability to effectively reduce the impact of construction on the surrounding environment and improve construction efficiency. Among foundation pit support technologies, diaphragm wall support is the most widely used. This involves pre-excavating a trench around the foundation pit, placing a reinforcing cage inside the trench, and then pouring concrete into the trench. After the concrete solidifies, a diaphragm wall is formed.

[0003] Although diaphragm wall support has high rigidity and low deformation, it has a long construction period, which affects the construction progress. In addition, it requires the transportation of a large amount of concrete to the construction site, and the spilled concrete causes significant environmental pollution.

[0004] Therefore, it is necessary to invent a reverse construction method for foundation pit support structure to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a reverse construction method foundation pit support structure to solve the problems of long construction cycles, which affect construction progress and cause significant environmental pollution.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a reverse construction method foundation pit support structure, including a precast straight wall and a precast corner wall. The surfaces of the precast straight wall and the precast corner wall are provided with splicing components. The splicing components include a first protrusion, a second protrusion, a first grouting groove, a first slot, a second slot, a reinforcing ring, and a second grouting groove. The interior of the precast straight wall and the precast corner wall are provided with two sets of insertion grooves, and a reinforcing component is inserted into the interior of the insertion groove.

[0007] By adopting the above technical solution, multiple sets of prefabricated straight walls and prefabricated corner walls are spliced ​​together to achieve rapid construction of diaphragm walls, effectively improving the construction progress. At the same time, reinforcement components are used to further improve the structural strength of the diaphragm walls.

[0008] Optionally, a first protrusion is provided at the upper end of both the precast straight wall and the precast corner wall, and a second protrusion is provided at the right end of the precast straight wall and the front end of the precast corner wall, with the first grouting groove opened inside the second protrusion.

[0009] Optionally, a first slot is provided at the lower end of both the precast straight wall and the precast corner wall, and a second slot is provided at the left end of both the precast straight wall and the precast corner wall.

[0010] By adopting the above technical solution, during the installation process, the first protrusion is stuck inside the first slot, and the second protrusion is stuck inside the second slot, which effectively improves the stability of the connection between the upper and lower sets and the left and right sets of prefabricated straight walls, as well as the stability of the connection between the prefabricated straight walls and the prefabricated corner walls.

[0011] Optionally, a steel ring is fixedly connected to the upper end of the first protrusion and the inner top wall of the first slot.

[0012] Optionally, the second grouting groove is disposed between the first protrusion and the first slot.

[0013] By adopting the above technical solution, after the precast straight wall and precast corner wall are spliced ​​together, concrete is injected from the first grouting tank into the interior of the second grouting tank to fill the gaps between the walls, improve the sealing performance of the underground continuous wall, and at the same time, the poured concrete and the steel rings work together to further improve the structural strength of the wall, effectively reduce the amount of concrete used, and improve the cleanliness of the environment.

[0014] Optionally, the reinforcement components include a first steel pipe column, a second steel pipe column, a mounting plate, a connecting groove, a connecting threaded rod, a straight steel beam, a corner steel beam, and connecting holes.

[0015] Optionally, the second steel pipe column is welded and fixed to the lower end of the first steel pipe column, and the mounting plate is welded and fixed to the upper end of the first steel pipe column. The first and second steel pipe columns are provided with connecting grooves inside, and connecting threaded rods are welded to both the left and right sides of the upper surface of the mounting plate.

[0016] By adopting the above technical solution, the second steel pipe is inserted into the internal connecting groove of the first steel pipe to connect and fix multiple sets of first steel pipes and second steel pipes. Multiple sets of first steel pipe columns and second steel pipe columns are inserted into the insertion groove to reinforce the upper and lower sets of precast straight walls or upper and lower sets of precast corner walls.

[0017] Optionally, the straight steel beam is set on the upper side of the precast straight wall, and the corner steel beam is set on the upper side of the precast corner wall. Both ends of the straight steel beam and the corner steel beam are provided with connection holes, and the connecting screw is inserted into the connection hole. The upper end of the connecting screw is threaded with a nut.

[0018] By adopting the above technical solution, the straight steel beam is fixed between the two sets of first steel pipe columns, and the corner steel beam is fixed on the upper side of the prefabricated corner wall, thereby improving the stability between the two sets of first steel pipe columns.

[0019] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. This utility model utilizes multiple sets of prefabricated straight walls and prefabricated corner walls to splice and cooperate with each other, thereby achieving rapid construction of underground continuous walls, effectively improving the construction progress, and at the same time, it is combined with reinforcement components to further improve the structural strength of the underground continuous walls; 2. This utility model fills the gaps between the walls by injecting concrete from the first grouting trench into the interior of the second grouting trench, thereby improving the sealing performance of the underground continuous wall. At the same time, the poured concrete, together with the reinforcing steel ring, further enhances the structural strength of the wall, effectively reduces the amount of concrete used, and improves environmental cleanliness. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the upper structure of the prefabricated straight wall and prefabricated corner wall of this utility model; Figure 3 This is a schematic diagram of the lower structure of the prefabricated straight wall and prefabricated corner wall of this utility model; Figure 4 This is a schematic diagram of the reinforcement component structure of this utility model; Figure 5 This is a schematic diagram of the mounting plate structure of this utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Precast straight wall; 11. Precast corner wall; 12. First protrusion; 13. Second protrusion; 14. First grouting groove; 15. First slot; 16. Second slot; 17. Reinforcing ring; 18. Insertion groove; 2. Second grouting groove; 3. Reinforcing component; 31. First steel pipe column; 32. Second steel pipe column; 33. Mounting plate; 34. Connecting groove; 35. Connecting threaded rod; 36. Straight steel beam; 37. Corner steel beam; 38. Connecting hole. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] This utility model provides, for example Figures 1 to 3The diagram illustrates a reverse-construction foundation pit support structure, comprising a precast straight wall 1 and a precast corner wall 11. The surfaces of the precast straight wall 1 and the precast corner wall 11 are provided with splicing components, including a first protrusion 12, a second protrusion 13, a first grouting groove 14, a first locking groove 15, a second locking groove 16, a reinforcing ring 17, and a second grouting groove 2. The upper ends of both the precast straight wall 1 and the precast corner wall 11 are provided with first protrusions 12, and the right end of the precast straight wall 1 and the front end of the precast corner wall 11 are provided with second protrusions 13. The first grouting... The groove 14 is opened inside the second protrusion 13. The lower end of the precast straight wall 1 and the precast corner wall 11 are both provided with a first slot 15. The left end of the precast straight wall 1 and the precast corner wall 11 are both provided with a second slot 16. The upper end of the first protrusion 12 and the inner top wall of the first slot 15 are both fixedly connected with a steel ring 17. The second grouting groove 2 is set between the first protrusion 12 and the first slot 15. The interior of the precast straight wall 1 and the precast corner wall 11 are both provided with two sets of insertion grooves 18. The inside of the insertion groove 18 is filled with a reinforcing component 3.

[0024] Among them, the first protrusion 12, the second protrusion 13, the first grouting groove 14, the first slot 15, the second slot 16, the steel ring 17, and the second grouting groove 2 on the surface of the precast straight wall 1 or the precast corner wall 11 are all integrally cast.

[0025] During installation, a trench is first excavated in the construction area, and precast straight walls 1 and precast corner walls 11 are installed sequentially inside the trench. During installation, the horizontal and verticality of precast straight walls 1 and precast corner walls 11 are maintained. After the bottom precast straight walls 1 and precast corner walls 11 are installed, crushed stone cushions are backfilled on both sides for reinforcement, burying them underground to support the upper precast straight walls 1 and precast corner walls 11. Then, multiple sets of precast straight walls 1 and precast corner walls 11 are sequentially spliced ​​on the upper side until they are installed to ground height. Then, the top is sealed. Finally, the foundation pit is excavated within the area enclosed by precast straight walls 1 and precast corner walls 11. Precast straight walls 1 and precast corner walls 11 support the foundation pit and can be used directly as the exterior walls of the building, avoiding the need for secondary pouring of the exterior walls.

[0026] In addition, after the precast straight wall 1 and the precast corner wall 11 are spliced ​​together, the conduit is inserted into the first grouting groove 14, and the concrete grout is injected into the interior of multiple sets of second grouting grooves 2 from bottom to top. Finally, the multiple sets of first grouting grooves 14 are filled. After the concrete grout solidifies, it seals the joints of the two sets of precast straight walls 1, the joints of the two sets of precast corner walls 11, and the joints of the precast straight wall 1 and the precast corner wall 11, thereby improving their sealing performance. After the concrete grout solidifies, it works with the reinforcing ring 17 to further improve the structural strength of the splicing of the precast straight wall 1 and the precast corner wall 11.

[0027] See Figure 1 , Figure 4 and Figure 5 The reinforcement component 3 includes a first steel pipe column 31, a second steel pipe column 32, a mounting plate 33, a connecting groove 34, a connecting threaded rod 35, a straight steel beam 36, a corner steel beam 37, and connecting holes 38. The second steel pipe column 32 is welded and fixed to the lower end of the first steel pipe column 31, and the mounting plate 33 is welded and fixed to the upper end of the first steel pipe column 31. The first steel pipe column 31 and the second steel pipe column 32 have connecting grooves 34 inside. The left and right sides of the upper surface of the mounting plate 33 are welded with connecting threaded rods 35. The straight steel beam 36 is set on the upper side of the precast straight wall 1, and the corner steel beam 37 is set on the upper side of the precast corner wall 11. The straight steel beam 36 and the corner steel beam 37 have connecting holes 38 at both ends. The connecting threaded rod 35 is inserted into the inside of the connecting hole 38, and the upper end of the connecting threaded rod 35 is threaded with a nut.

[0028] Meanwhile, during the splicing of the precast straight wall 1 and the precast corner wall 11, after the first layer is spliced, multiple sets of first steel pipe columns 31 and second steel pipe columns 32 are sequentially inserted into the interior of multiple sets of insertion slots 18. At this time, the second steel pipe column 32 will pass through the insertion slot 18 and insert into the interior of the foundation soil below the trench section, and the first steel pipe column 31 will be stuck inside the insertion slot 18, effectively improving the structural strength and stability of the bottommost layer of underground continuous wall and preventing the foundation from deforming during subsequent splicing.

[0029] Furthermore, during the subsequent splicing process, after each side is spliced, the first steel pipe column 31 and the second steel pipe column 32 are inserted into the multiple sets of insertion slots 18 on that layer. At this time, the second steel pipe column 32 will penetrate through the insertion slot 18 and be inserted into the connecting slot 34 inside the first steel pipe column 31 on the lower side, splicing the upper and lower sets of steel pipe columns and improving the stability between the upper and lower sets of walls to avoid positional displacement.

[0030] The working principle of this utility model is as follows: By using multiple sets of prefabricated straight walls 1 and prefabricated corner walls 11 to splice and cooperate with each other, the construction of underground continuous walls can be carried out quickly, effectively improving the construction progress. At the same time, the reinforcement components 3 are used to further improve the structural strength of the underground continuous walls. Furthermore, by injecting concrete from the first grouting groove 14 into the interior of the second grouting groove 2, the gaps between the walls are filled, improving the sealing performance of the underground continuous walls. Meanwhile, the poured concrete, together with the steel reinforcement rings 17, further improves the structural strength of the walls and effectively reduces the amount of concrete used, thus improving environmental cleanliness.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A reverse-construction foundation pit support structure, comprising a precast straight wall (1) and a precast corner wall (11), characterized in that: The surfaces of the precast straight wall (1) and the precast corner wall (11) are provided with splicing components, which include a first protrusion (12), a second protrusion (13), a first grouting groove (14), a first slot (15), a second slot (16), a steel ring (17), and a second grouting groove (2). The interior of the precast straight wall (1) and the precast corner wall (11) are provided with two sets of insertion slots (18), and a reinforcing component (3) is inserted into the insertion slot (18).

2. The reverse construction method foundation pit support structure according to claim 1, characterized in that: The upper ends of the precast straight wall (1) and the precast corner wall (11) are provided with a first protrusion (12), and the right end of the precast straight wall (1) and the front end of the precast corner wall (11) are provided with a second protrusion (13). The first grouting groove (14) is opened inside the second protrusion (13).

3. The reverse construction method foundation pit support structure according to claim 2, characterized in that: The lower ends of the precast straight wall (1) and the precast corner wall (11) are provided with a first slot (15), and the left ends of the precast straight wall (1) and the precast corner wall (11) are provided with a second slot (16).

4. The reverse construction method foundation pit support structure according to claim 3, characterized in that: The upper end of the first protrusion (12) and the inner top wall of the first slot (15) are both fixedly connected with steel rings (17).

5. The reverse construction method foundation pit support structure according to claim 4, characterized in that: The second grouting groove (2) is disposed between the first protrusion (12) and the first slot (15).

6. The reverse construction method foundation pit support structure according to claim 1, characterized in that: The reinforcement component (3) includes a first steel pipe column (31), a second steel pipe column (32), a mounting plate (33), a connecting groove (34), a connecting threaded rod (35), a straight steel beam (36), a corner steel beam (37), and a connecting hole (38).

7. The reverse construction method foundation pit support structure according to claim 6, characterized in that: The second steel pipe column (32) is welded and fixed to the lower end of the first steel pipe column (31), and the mounting plate (33) is welded and fixed to the upper end of the first steel pipe column (31). The first steel pipe column (31) and the second steel pipe column (32) are provided with connecting grooves (34), and connecting screws (35) are welded to the left and right sides of the upper surface of the mounting plate (33).

8. The reverse construction method foundation pit support structure according to claim 7, characterized in that: The straight steel beam (36) is set on the upper side of the precast straight wall (1), and the corner steel beam (37) is set on the upper side of the precast corner wall (11). Both ends of the straight steel beam (36) and the corner steel beam (37) are provided with connecting holes (38). The connecting screw (35) is inserted into the inside of the connecting hole (38), and the upper end of the connecting screw (35) is threaded with a nut.

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