Foundation pit supporting steel sheet pile and top beam connecting structure

Abstract

The utility model discloses a foundation pit supporting steel sheet pile and top beam connecting structure and belongs to the technical field of foundation pit supporting engineering. The structure is simple, operation is easy and convenient, the crown beam and steel sheet pile pulling construction efficiency can be improved, steel sheet pile loss is reduced, and waste is reduced. The anchoring steel plate and the steel plate pile are fixedly connected through the connecting steel plate by using the high-strength bolt, the anchoring steel plate is anchored into the crown beam reinforcement cage, the pile end of the steel plate pile is arranged at the position 50mm below the crown beam cushion layer, after a foundation pit fat groove is backfilled and before the steel plate pile is pulled out, the high-strength bolt for connecting the steel plate pile and the connecting plate is detached, and then the steel plate pile and the crown beam can be disconnected. After the crown beam is moved away, the procedure of pulling out the steel pile is carried out, in this way, construction of the crown beam and recycling of the steel sheet pile can be completed without a large amount of welding and cutting work or large-area breaking of the crown beam, the construction efficiency of pulling out the crown beam and the steel sheet pile is greatly improved, waste of reinforcing steel bars is reduced, and the anchoring steel plate can be recycled.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit support engineering technology, specifically relating to a connection structure between foundation pit support steel sheet piles and capping beams. Background Technology

[0002] Currently, sheet piles are widely used as retaining piles in foundation pit support engineering. However, in some projects, a capping beam needs to be installed on top of the sheet piles to reduce displacement at the top. In existing technologies, the upper part of the sheet pile is usually poured into the capping beam along with the sheet pile. This method requires large-scale demolition of the capping beam before the sheet pile is extracted, reducing construction efficiency and affecting the recovery rate of the sheet piles. Furthermore, the smooth surface of the sheet pile results in low friction when connected to the capping beam, making the connection prone to failure.

[0003] Chinese patent document publication number CN211948371U, entitled "A Steel Sheet Pile Crown Beam Connection Structure," includes steel sheet piles, reinforcing bars, and a crown beam reinforcing cage. The first end of the reinforcing bar is fixedly connected to the top of the steel sheet pile, and the second end of the reinforcing bar extends beyond the top of the steel sheet pile. The crown beam reinforcing cage is fixedly connected to the second end of the reinforcing bar, and a first gap exists between the crown beam reinforcing cage and the top of the steel sheet pile. This utility model patent solves the problem of low steel sheet pile recovery rate, but because multiple reinforcing bars need to be welded to the steel sheet pile to ensure the reinforcing bars anchored in the crown beam have a certain rigidity (see appendix of this patent). Figure 2 The diagram shows a method where two steel bars are connected to the sheet pile. The number of steel bars is relatively small and cannot meet the requirements for the stiffness of the capping beam. This results in limited improvement in construction efficiency. Welding the steel bars to the sheet pile also reduces the service life of the sheet pile. Furthermore, the steel bars welded to the sheet pile cannot be reused after being cut, resulting in waste. Utility Model Content

[0004] In order to solve the above problems, this utility model provides a connection structure between steel sheet piles and capping beams for foundation pit support. This structure is simple and easy to operate, which can improve the efficiency of capping beam and steel sheet pile extraction, reduce steel sheet pile loss, and reduce waste.

[0005] The technical solution adopted by this utility model is:

[0006] A structure for connecting sheet piles and capping beams in foundation pit support includes a capping beam reinforcement cage, a cushion layer, multiple sheet piles, multiple anchoring steel plates, and multiple connecting plates. Each of the multiple anchoring steel plates is connected to a corresponding sheet pile below it through a connecting plate. The multiple anchoring steel plates are anchored into the capping beam reinforcement cage. A cushion layer is provided at the bottom of the capping beam reinforcement cage, and the pile ends of the multiple sheet piles are located below the cushion layer.

[0007] Compared with the prior art, the present invention has the following advantages:

[0008] This invention uses high-strength bolts to fix the anchoring steel plate to the sheet pile, anchoring the steel plate into the reinforcing cage of the capping beam. The end of the sheet pile is located 50mm below the capping beam cushion layer. After the foundation pit is backfilled, the high-strength bolts connecting the sheet pile to the connecting plate are removed before pulling out the sheet pile, thus disconnecting the sheet pile from the capping beam. After the capping beam is removed, the sheet pile can be pulled out. This eliminates the need for extensive welding and cutting work, as well as large-area destruction of the capping beam, allowing for the completion of the capping beam construction and the recycling of the sheet pile. This greatly improves the construction efficiency of capping beam and sheet pile removal, reduces the waste of reinforcing steel, and allows the anchoring steel plate to be recycled and reused.

[0009] The upper flange of the anchoring steel plate of this utility model is provided with an anti-slip groove, which increases the connection friction between the steel sheet pile and the capping beam and ensures the effective connection between the steel sheet pile and the capping beam.

[0010] This utility model has a simple structure, simple process, low production cost, wide range of applications, and broad market application prospects. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the connection between the steel sheet pile, anchoring steel plate, and connecting plate of this utility model;

[0013] Figure 3 This is a top view of the connecting plate of this utility model;

[0014] Figure 4 This is a front view of the connecting plate of this utility model;

[0015] The components include: 1. Steel sheet piles; 2. Anchor steel plates; 3. Connecting plates; 4. High-strength bolts; 5. Crown beam reinforcement cage; 6. Cushion layer; 7. Bolt holes; and 8. Anti-slip grooves. Detailed Implementation

[0016] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model will be provided below with reference to the accompanying drawings.

[0017] like Figures 1-4 As shown, this utility model provides a connection structure between sheet piles and capping beams for foundation pit support, including a capping beam reinforcement cage 5, a cushion layer 6, multiple sheet piles 1, multiple anchoring steel plates 2, and multiple connecting plates 3; each of the multiple anchoring steel plates 2 is connected to the corresponding sheet pile 1 below through a connecting plate 3, and the multiple anchoring steel plates 2 are anchored into the capping beam reinforcement cage 5. The bottom of the capping beam reinforcement cage 5 is provided with a 100mm thick concrete cushion layer 6, and the pile ends of the multiple sheet piles 1 are located below the cushion layer 6.

[0018] like Figures 1-4As shown, each of the connecting plates 3 has multiple bolt holes 7 for installing high-strength bolts 4. The connecting plates 3 connect the sheet pile 1 and the anchoring steel plate 2 through the bolt holes 7 and the high-strength bolts 4.

[0019] The connecting plate 3 is divided into upper and lower parts, each with bolt holes 7. The position, size, and number of bolt holes 7 in the upper part are the same as those in the anchoring steel plate 2, and the position, size, and number of bolt holes 7 in the lower part are the same as those in the steel sheet pile 1.

[0020] like Figure 1 , Figure 2 As shown, each of the anchoring steel plates 2 has anti-slip grooves 8 on its upper left and right sides. The anti-slip grooves 8 can be rectangular, trapezoidal, triangular, etc. The depth of the anti-slip grooves 8 is 20mm and the spacing is 30mm.

[0021] like Figure 3 As shown, each of the steel sheet piles 1 is made of I-beams or H-beams.

[0022] like Figure 3 As shown, each anchoring steel plate 2 is made of the same type of steel as the sheet pile 1; the length of the anchoring steel plate 2 is adjusted according to the height of the capping beam reinforcement cage 5.

[0023] like Figure 3 As shown, each of the connecting plates 3 is a steel plate with the same thickness as the flange of the sheet pile 1. The width of the connecting plate 3 is 2-4 cm less than the flange width of the sheet pile 1, and the length of the connecting plate 3 is 300-400 mm.

[0024] High-strength bolt 4 uses bolts of M12 or larger;

[0025] like Figure 1 As shown, the top of each sheet pile 1 is located 45-55mm below the cushion layer 6 of the capping beam reinforcement cage 5, preferably 50mm, and there is a 45-55mm gap between the top of the sheet pile 1 and the cushion layer 6, preferably 50mm. This gap is to prevent the top of the sheet pile 1 from connecting with the capping beam reinforcement cage 5 and to facilitate the separation of the sheet pile 1 from the capping beam reinforcement cage 5.

[0026] The end of the sheet pile 1, the anchoring steel plate 2, the connecting plate 3, and the high-strength bolt 4 are all coated with a release agent.

[0027] Before driving sheet pile 1, bolt holes are drilled at its top, and the pile is driven until the bottom row of bolt holes is 50mm above the ground.

[0028] Before the construction of the cap beam, bolt holes 7 are drilled in the anchoring steel plate 2 and the connecting plate 3, and the steel sheet pile 1, anchoring steel plate 2, connecting plate 3 and high-strength bolt 4 exposed on the bottom surface are coated with release agent;

[0029] After the anchoring steel plate 2 is connected and fixed to the top of the steel sheet pile 1 one by one with high-strength bolts 4 through the connecting plate 3, 50mm of soil is backfilled, and then the cap beam construction is carried out: laying the cushion layer 6, setting up the formwork, tying the steel cage, and pouring concrete.

[0030] Before construction, calculations showed that when the change in the displacement of the top of the pile needs to be controlled by the capping beam, the steel sheet pile 1 on the outside of the foundation pit and the connecting plate 3 do not need to be connected by high-strength bolts 4.

[0031] When the foundation pit is backfilled to 50-100mm above the ground of the cap beam cushion layer 6, the high-strength bolts 4 at the end of the steel sheet pile 1 are removed, the cap beam is cut in sections, the cap beam is removed, and then the steel sheet pile 1 is pulled out.

[0032] The crown beam can be broken up in an open space or landfill to separate the anchoring steel plate 2, which can then be leveled and repaired for reuse.

[0033] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A connection structure between steel sheet piles and capping beams for foundation pit support, characterized in that: It includes a cap beam reinforcement cage (5), a cushion layer (6), multiple sheet piles (1), multiple anchor plates (2) and multiple connecting plates (3); each of the multiple anchor plates (2) is connected to the corresponding sheet pile (1) below through a connecting plate (3), and the multiple anchor plates (2) are anchored into the cap beam reinforcement cage (5). The bottom of the cap beam reinforcement cage (5) is provided with a cushion layer (6), and the pile ends of the multiple sheet piles (1) are located below the cushion layer (6).

2. The connection structure between steel sheet piles and capping beams for foundation pit support according to claim 1, characterized in that: Each of the connecting plates (3) has multiple bolt holes (7) for installing high-strength bolts (4). The connecting plates (3) connect the sheet piles (1) and the anchor plates (2) through the bolt holes (7) and the high-strength bolts (4).

3. The connection structure between steel sheet piles and capping beams for foundation pit support according to claim 1, characterized in that: Each of the anchoring steel plates (2) has anti-slip grooves (8) on the upper left and right sides.

4. The connection structure between steel sheet piles and capping beams for foundation pit support according to claim 1, characterized in that: Each of the sheet piles (1) is made of I-beams or H-beams.

5. The connection structure between steel sheet piles and capping beams for foundation pit support according to claim 4, characterized in that: Each anchoring steel plate (2) is made of the same type of steel as the sheet pile (1).

6. The connection structure between steel sheet piles and capping beams for foundation pit support according to claim 5, characterized in that: Each of the connecting plates (3) is a steel plate with the same flange thickness as the sheet pile (1), the width of the connecting plate (3) is 2-4cm less than the flange width of the sheet pile (1), and the length of the connecting plate (3) is 300-400mm.

7. The connection structure between steel sheet piles and capping beams for foundation pit support according to claim 1, characterized in that: The top of each sheet pile (1) is located 45-55mm below the cushion layer (6) of the capping beam reinforcement cage (5), and there is a 45-55mm gap between the top of the sheet pile (1) and the cushion layer (6).

8. The connection structure between steel sheet piles and capping beams for foundation pit support according to claim 2, characterized in that: The ends of the sheet piles (1), the anchoring steel plates (2), the connecting plates (3), and the high-strength bolts (4) are all coated with a release agent.

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