A method for supporting a foundation pit of a construction project

Abstract

The application discloses a foundation pit supporting method for building engineering and relates to the technical field of foundation pit supporting.The foundation pit supporting method for building engineering comprises the following steps: 1, foundation pit surveying, performing engineering geological investigation on the foundation pit according to engineering geological and hydrogeological data of geotechnical engineering conditions, and entering an excavation stage after determining the engineering conditions of the site; 2, foundation pit excavation, excavating the engineering site after the foundation pit surveying, digging a pit groove in the foundation pit during the excavation process, and backfilling soil generated during pile driving in the foundation pit into the pit groove; 3, foundation pit supporting positioning, inserting positioning devices into the foundation pit in sequence after the completion of the foundation pit excavation, and positioning the foundation pit supporting through the positioning devices; and 4, foundation pit supporting, starting pile driving after determining the positions of the foundation pit pile driving through the positioning devices.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, and in particular to a foundation pit support method for building engineering. Background Technology

[0002] As is well known, foundation pit support in construction engineering is used to reinforce the side walls of the foundation pit and the surrounding environment. The main purpose of foundation pit support is to prevent destructive displacement of the slope. Foundation pit support is usually carried out by first excavating on the construction site. After the excavation is completed, piles are driven and the steel reinforcement support piles are placed into the pile holes before concrete is poured. However, because air bubbles exist in the concrete after pouring, it will affect the strength of the foundation pit support. In addition, protective pipes are used during pouring, and they need to be removed after pouring, which is quite troublesome. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the purpose of this invention is to provide a method for foundation pit support in building engineering.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0005] A method for supporting foundation pits in building construction includes the following steps:

[0006] S1. Foundation pit survey: Based on the geotechnical engineering conditions, engineering geological and hydrogeological data are used to conduct an engineering geological survey of the foundation pit. After determining the engineering conditions of the site, the excavation stage begins.

[0007] S2. Excavation of the foundation pit: After the foundation pit survey is completed, the project site is excavated. During the excavation process, an additional pit is dug in the foundation pit. The soil generated during the pile driving in the foundation pit is backfilled into the pit.

[0008] S3. Foundation pit support positioning: After the foundation pit is excavated, the positioning device is inserted into the foundation pit in sequence to perform foundation pit support positioning.

[0009] S4. Foundation pit support: After determining the location of the foundation pit piles using the positioning device, pile driving begins. After pile driving is completed, the pouring device is installed. After the pouring device is installed, the support piles are placed into the pile body. After placement, concrete is poured into the pile body using the pouring device. After the concrete is poured, the pile body is vacuumed.

[0010] The positioning device consists of positioning columns, connecting pipes, and connecting columns. The top of the pit is provided with positioning columns arranged at equal intervals. Each positioning column has a connecting pipe of the same length in the middle. The connecting pipe is provided with a connecting column. The outer circumference of the connecting column is provided with a connecting hole that communicates with the positioning column. The bottom of the connecting column is provided with a drainage hole that communicates with the connecting hole. One of the positioning columns is provided with a water inlet pipe.

[0011] The pouring device consists of a sealing device and a vacuuming device. The sealing device consists of a fixed ring, a movable ring, and a sealing bag. A support rod is provided at the top of the pile body. A fixed ring is provided on the support rod. A connecting block is provided on the fixed ring and connected to the support rod. A movable ring is snapped onto the fixed ring. A sealing bag connected to the fixed ring is provided on the movable ring. The diameter of the movable ring is the same as the diameter of the support pile. A vacuuming device is installed inside the fixed ring.

[0012] The vacuuming device comprises a connector, a mounting column, a rotating column, a connecting rod, a rotating handle, a limiting block, a limiting rod, a movable block, and a connecting bag. The mounting column is cylindrical, with an integrally formed connector at its bottom. The connector is threadedly connected to a fixing ring. Inside the mounting column is a movable block, on which a connecting bag is attached. The connecting bag is connected to the inner wall of the mounting column. At the top of the movable block is an integrally formed limiting rod, with a limiting block at its top. Inside the mounting column is a threadedly connected rotating column, with a cavity inside which the limiting block at the top of the limiting rod is located. The limiting rod and the rotating column are rotatably connected, sharing the same central axis. At the top of the movable block is an integrally formed connecting rod, with equally spaced rotating handles on the outer circumference of the connecting rod.

[0013] The outer circumferential surface of the mounting column is provided with an auxiliary device to help the connecting rod rotate.

[0014] The auxiliary device consists of a mounting rod, a support block, a rotating shaft, a movable rod, a positioning pin, and a lever. The mounting rod is located on the outer circumference of the mounting column, and a support block is correspondingly located at the top of the mounting rod. A rotating shaft is mounted on the support block, and a movable rod is rotatably connected to the rotating shaft. The movable rod has a rotating hole, and the rotating shaft is inserted into the rotating hole. The movable rod is rotatably connected to the rotating shaft through the rotating hole. A slot is located at the top of the movable rod, and a locking block is located within the slot. A fixing hole is located on the side of the movable rod, penetrating the slot and the locking block. A fixing pin is fitted into the fixing hole, and the locking block is rotatably connected to the fixing pin through the fixing hole. A lever with an integrated structure is located on the locking block.

[0015] When installing the support pile, press the bottom of the support pile against the top of the movable ring. As the support pile enters the borehole body, it will move the movable ring along with it. During the movement of the movable ring, the sealing bag stored in the fixed ring will be brought out and moved down with it. When the support pile is at the bottom of the borehole body, the fixed ring will also enter the bottom of the borehole body. At this time, the inside of the fixed ring can be poured.

[0016] The mounting column and the fixing ring are connected by a connector. After the connection is completed, a vacuum is formed inside the mounting column and the sealing bag, and the vacuuming process can begin. By rotating the connecting rod, the rotating column can move the limiting block. When the limiting block moves the movable block, the connecting bag will draw air bubbles in the concrete into the connecting bag and the sealing bag.

[0017] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0018] By installing a pouring device inside the bored pile body to assist in the pouring of foundation pit support, and by pouring inside a sealed bag, the step of pouring with a protective pipe is eliminated. By setting up a vacuum device to evacuate the inside of the foundation pit support, air bubbles in the concrete are extracted, resulting in higher protective strength of the foundation pit support. The present invention has a simple and reasonable structure, which makes it easier to pour concrete into the bored pile body and results in higher strength concrete with fewer air bubbles. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pouring device structure of the present invention;

[0020] Figure 2 This is an enlarged schematic diagram of point A in the present invention;

[0021] Figure 3 This is a cross-sectional structural diagram of the casting device of the present invention;

[0022] Figure 4 A schematic diagram showing the structure of the fixing ring and sealing bag of the present invention;

[0023] Figure 5 This is a schematic diagram of the foundation pit construction of the present invention;

[0024] 1. Excavation pit; 2. Positioning column; 3. Connecting pipe; 4. Connecting column; 5. Pit pile body; 6. Support rod; 7. Connecting block; 8. Fixing ring; 9. Movable ring; 10. Sealing bag; 11. Connector; 12. Rotating column; 13. Connecting rod; 14. Rotating handle; 15. Limiting block; 16. Limiting rod; 17. Movable block; 18. Connecting bag; 19. Lever; 20. Locking block; 21. Mounting rod; 22. Supporting block; 23. Rotating shaft; 24. Movable rod; 25. Positioning pin; 26. Slot; 27. Mounting column. Detailed Implementation

[0025] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0026] Combined with appendix Figures 1-5 The aforementioned method for foundation pit support in building construction includes the following steps:

[0027] S1. Foundation pit survey: Based on the geotechnical engineering conditions, engineering geological and hydrogeological data are used to conduct an engineering geological survey of the foundation pit. After determining the engineering conditions of the site, the excavation stage begins.

[0028] S2. Excavation of the foundation pit: After the foundation pit survey is completed, the project site is excavated. During the excavation process, an additional pit is dug in the foundation pit. The soil generated during the pile driving in the foundation pit is backfilled into the pit.

[0029] S3. Foundation pit support positioning: After the foundation pit is excavated, the positioning device is inserted into the foundation pit in sequence to perform foundation pit support positioning.

[0030] S4. Foundation pit support: After determining the location of the foundation pit piles using the positioning device, pile driving begins. After pile driving is completed, the pouring device is installed. After the pouring device is installed, the support piles are placed into the pile body. After placement, concrete is poured into the pile body 5 using the pouring device. After the concrete is poured, the pile body 5 is vacuumed.

[0031] The positioning device consists of positioning posts 2, connecting pipes 3 and connecting posts 4. The top of the pit 1 is provided with positioning posts 2 arranged at equal intervals. Each positioning post 2 is provided with a connecting pipe 3 of the same length in the middle. The connecting pipe 3 is provided with a connecting post 4. The outer circumference of the connecting post 4 is provided with a connecting hole that communicates with the positioning post 2. The bottom of the connecting post 4 is provided with a drainage hole that communicates with the connecting hole. One of the positioning posts 2 is provided with a water inlet pipe.

[0032] The pouring device consists of a sealing device and a vacuum device. The sealing device consists of a fixed ring 8, a movable ring 9, and a sealing bag 10. A support rod 6 is provided at the top of the pile body 5. The support rod 6 is provided with a fixed ring 8. A connecting block 7 is provided on the fixed ring 8 and connected to the support rod 6. The movable ring 9 is snapped onto the fixed ring 8. The movable ring 9 is provided with a sealing bag 10 connected to the fixed ring 8. The diameter of the movable ring 9 is the same as the diameter of the support pile. A vacuum device is installed inside the fixed ring 8.

[0033] The vacuuming device comprises a connector 11, a mounting column 27, a rotating column 12, a connecting rod 13, a rotating handle 14, a limiting block 15, a limiting rod 16, a movable block 17, and a connecting bag 18. The mounting column 27 is cylindrical, and its bottom has an integrally formed connector 11. The connector 11 is threadedly connected to the fixing ring 8. The mounting column 27 has a movable block 17 inside, and the movable block 17 has a connecting bag 18 attached to it. The connecting bag 18 is connected to the inner wall of the mounting column 27. The top of the movable block 17 is provided with an integral limiting rod 16, and the top of the limiting rod 16 is provided with a limiting block 15. The interior of the mounting column 27 is provided with a threaded rotating column 12. The rotating column 12 has a cavity inside, and the limiting block 15 at the top of the limiting rod 16 is located inside the cavity. The limiting rod 16 and the rotating column 12 are rotatably connected and are on the same central axis. The top of the movable block 17 is provided with an integral connecting rod 13, and the outer circumferential surface of the connecting rod 13 is provided with equidistantly distributed rotating handles 14.

[0034] The outer circumferential surface of the mounting column 27 is provided with an auxiliary device to help the connecting rod 13 rotate. Since it is difficult to rotate the handle 14 manually, the auxiliary device is needed to rotate it.

[0035] The auxiliary device consists of a mounting rod 21, a support block 22, a rotating shaft 23, a movable rod 24, a positioning pin 25, and a lever 19. The mounting rod 21 is provided on the outer circumference of the mounting column 27. The support block 22 is provided on the top of the mounting rod 21. The rotating shaft 23 is provided on the support block 22. The movable rod 24 is rotatably connected to the rotating shaft 23. The movable rod 24 is provided with a rotating hole. The rotating shaft 23 is located in the rotating hole. The movable rod 24 is rotatably connected to the rotating shaft 23 through the rotating hole. The top of the movable rod 24 is provided with a slot 26. A locking block 20 is provided in the slot 26. The side of the movable rod 24 is provided with a fixing hole. The fixing hole passes through the slot 26 and the locking block 20. A fixing pin is installed in the fixing hole. The locking block 20 is rotatably connected to the fixing pin through the fixing hole. The locking block 20 is provided with an integral lever 19.

[0036] When installing the support pile, press the bottom of the support pile against the top of the movable ring 9. When the support pile enters the pile body 5, it will drive the movable ring 9 to move together. During the movement of the movable ring 9, the sealing bag 10 stored in the fixed ring 8 will be brought out and moved down together. When the support pile is at the bottom of the pile body 5, the fixed ring 8 will also enter the bottom of the pile body 5. At this time, the inside of the fixed ring 8 can be poured.

[0037] The mounting column 27 and the fixing ring 8 are connected by the connector 11. After the connection is completed, a vacuum state is formed inside the mounting column 27 and the sealing bag 10, and the vacuuming can begin. By rotating the connecting rod 13, the rotating column 12 can drive the limiting block 15 to move. When the limiting block 15 drives the movable block 17 to move, the connecting bag 18 will draw the air bubbles in the concrete into the connecting bag 18 and the sealing bag 10.

[0038] In this embodiment, during foundation pit support, to reduce air bubbles in the concrete poured inside the bored pile body 5, it is necessary to vacuum the concrete. The position of the bored pile body 5 is located using a positioning device. The water inlet pipe on the positioning column 2 is connected to an external water pipe, and water flows through the connecting pipe 3 to the position of the bored pile body 5 to be piled. After the pile driving work of the empty body is completed, the support rod 6 is inserted into the ground near the empty body to start the installation of the support pile and the pouring of concrete. After the support pile is placed into the bored pile body 5 through the fixing ring 8, the vacuuming device can be used to vacuum the concrete. After the vacuuming is completed, the support rod 6 can be disassembled, and the fixing ring 8 can be separated from the sealing bag 10 to complete the foundation pit support. During vacuuming, an auxiliary device can be used to help rotate the handle 14. By using the lever 19, the handle 14 can be rotated more easily.

[0039] The parts of this invention not described in detail are prior art. Although the invention has been specifically shown and introduced in conjunction with preferred embodiments, there are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of the invention. However, those skilled in the art should understand that various changes in form and detail can be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the invention.

Claims

1. A method for supporting foundation pits in building construction, characterized by: Includes the following steps: S1. Foundation pit survey: Based on the geotechnical engineering conditions, engineering geological and hydrogeological data are used to conduct an engineering geological survey of the foundation pit. After determining the engineering conditions of the site, the excavation stage begins. S2. Excavation of the foundation pit: After the foundation pit survey is completed, the project site is excavated. During the excavation process, an additional pit is dug in the foundation pit. The soil generated during the pile driving in the foundation pit is backfilled into the pit. S3. Foundation pit support positioning: After the foundation pit is excavated, the positioning device is inserted into the foundation pit in sequence to perform foundation pit support positioning. S4. Foundation pit support: After determining the location of the foundation pit pile by the positioning device, the pile driving begins. After the pile driving is completed, the pouring device is installed. After the pouring device is installed, the support pile is placed into the hole pile body. After the placement is completed, the concrete is poured into the hole pile body (5) by the pouring device. After the concrete is poured, the hole pile body (5) is vacuumed. The casting device consists of a sealing device and a vacuum device. The sealing device consists of a fixed ring (8), a movable ring (9), and a sealing bag (10). A support rod (6) is provided on the top of the pile body (5). A fixed ring (8) is provided on the support rod (6). A connecting block (7) is provided on the fixed ring (8) and the connecting block (7) is connected to the support rod (6). A movable ring (9) is snapped onto the fixed ring (8). A sealing bag (10) connected to the fixed ring (8) is provided on the movable ring (9). The diameter of the movable ring (9) is the same as the diameter of the support pile. A vacuum device is installed inside the fixed ring (8). The vacuuming device consists of a connector (11), a mounting column (27), a rotating column (12), a connecting rod (13), a rotating handle (14), a limiting block (15), a limiting rod (16), a movable block (17), and a connecting bag (18). The mounting column (27) is cylindrical, and the bottom of the mounting column (27) is provided with an integrally structured connector (11). The connector (11) is threadedly connected to the fixing ring (8). The mounting column (27) has a movable block (17) inside, and the movable block (17) is provided with a connecting bag (18). The connecting bag is connected to the inner wall of the mounting column (27). The top of the movable block (17) is provided with an integrally structured limiting rod (16), and the top of the limiting rod (16) is provided with a limiting block (15). The interior of the mounting column (27) is provided with a threaded rotating column (12). The interior of the rotating column (12) is provided with a cavity, and the limiting block (15) at the top of the limiting rod (16) is located inside the cavity. The limiting rod (16) and the rotating column (12) are rotatably connected. The limiting rod (16) and the rotating column (12) are on the same central axis. The top of the movable block (17) is provided with an integrally structured connecting rod (13), and the outer circumferential surface of the connecting rod (13) is provided with equidistantly distributed rotating handles (14).

2. The foundation pit support method for building construction according to claim 1, characterized in that: The positioning device consists of a positioning column (2), a connecting pipe (3) and a connecting column (4). The top of the pit (1) is provided with positioning columns (2) arranged at equal intervals. Each positioning column (2) is provided with a connecting pipe (3) of the same length in the middle. The connecting pipe (3) is provided with a connecting column (4). The outer circumference of the connecting column (4) is provided with a connecting hole that communicates with the positioning column (2). The bottom of the connecting column (4) is provided with a drainage hole that communicates with the connecting hole. One of the positioning columns (2) is provided with a water inlet pipe.

3. The foundation pit support method for building construction according to claim 1, characterized in that: The outer circumferential surface of the mounting post (27) is provided with an auxiliary device to help the connecting rod (13) rotate.

4. The foundation pit support method for building construction according to claim 3, characterized in that: The auxiliary device consists of a mounting rod (21), a support block (22), a rotating shaft (23), a movable rod (24), a positioning pin (25), and a lever (19). The mounting rod (21) is provided on the outer circumferential surface of the mounting column (27). The top of the mounting rod (21) is provided with a support block (22). The support block (22) is provided with a rotating shaft (23). The rotating shaft (23) is provided with a movable rod (24) rotatably connected to it. The movable rod (24) is provided with a rotating hole. The rotating shaft (25) is connected to the lever (19). 3) Located in the rotating hole, the movable rod (24) is rotatably connected to the rotating shaft (23) through the rotating hole. The top of the movable rod (24) is provided with a slot (26), and a locking block (20) is provided in the slot (26). The side of the movable rod (24) is provided with a fixing hole, which passes through the slot (26) and the locking block (20). A positioning pin is installed in the fixing hole. The locking block (20) is rotatably connected to the positioning pin through the fixing hole. The locking block (20) is provided with an integral lever (19).

5. The foundation pit support method for building construction according to claim 1, characterized in that: When installing the support pile, press the bottom of the support pile against the top of the movable ring (9). When the support pile enters the pile body (5), it will drive the movable ring (9) to move together. During the movement of the movable ring (9), the sealing bag (10) stored in the fixed ring (8) will be brought out and moved together. When the support pile is at the bottom of the pile body (5), the fixed ring (8) will also enter the bottom of the pile body (5). At this time, the inside of the fixed ring (8) is poured.

6. The foundation pit support method for building construction according to claim 1, characterized in that: The mounting column (27) and the fixing ring (8) are connected by the connector (11). After the connection is completed, the vacuum is started. The mounting column (27) and the sealing bag (10) are in a vacuum state. The rotating column (12) is driven by the rotating connecting rod (13) to move the limiting block (15). When the limiting block (15) drives the moving block (17) to move, the connecting bag (18) will draw the air bubbles in the concrete into the connecting bag (18) and the sealing bag (10).

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