A column structure for foundation pit protection

Abstract

This application discloses a column structure for foundation pit support, including at least one lower pile member disposed below the basement floor slab. When there are two lower pile members, they are divided into a first support member and a second support member. The first support member is located between the floor slab and the second support member. Both the first and second support members have mounting grooves at their respective ends facing each other. A connecting device is used to fix the first and second support members together. The connecting device includes a connecting component and at least two end plates. The two end plates are located between the first and second support members and are anchored to the first and second support members respectively. The connecting component is inserted into the two end plates, and both ends of the connecting component are respectively installed in the mounting grooves of the first and second support members. This application can improve the tensile, bending, and shear strength of the connection, ensuring the overall stability and safety of the foundation pit support structure.

Description

Technical Field

[0001] This application relates to the field of building engineering technology, specifically to a column structure for foundation pit protection. Background Technology

[0002] Existing foundation pit support systems (column structures) mainly consist of upper support components (lattice columns) and at least one lower pile component. The upper support component is positioned above the lower pile component. When there are two lower pile components, they can be divided into a first support component and a second support component, with the first support component located between the upper and second support components. The lower pile components primarily employ bored piles and precast piles. Traditional bored piles suffer from drawbacks such as long construction periods, high costs, and poor pile quality. Precast piles, due to their factory-prefabricated nature, allow for quality and performance testing through visual inspection and type testing, thus ensuring pile quality and mechanical properties to a greater extent. However, the length of precast piles presents significant disadvantages in production and transportation. For precast piles, the quality of the joints during pile driving directly affects the performance and quality of the pile foundation. If precast piles are used as the lower pile component of the column, the connection method between the upper support component and the lower pile component, as well as the connection method between two adjacent lower pile components, is particularly important.

[0003] Currently, the two most common connection methods are welding and mechanical connection.

[0004] Welding is a traditional construction technique that emerged alongside pipe piles. Due to its relatively simple construction and convenient operation, it remains the most widely used connection method. However, the quality of on-site welding is greatly affected by weather and human factors, and there is a lack of reliable means to verify the effectiveness of the connection on-site. Furthermore, welded connections have poor corrosion resistance and durability, leading to insufficient bearing capacity at the joints between adjacent lower pile components. Therefore, precast pile foundations using only welding are generally not chosen for important projects or tensile pile projects.

[0005] Mechanical connections primarily rely on the snap-fit ​​design of appropriate mechanical connectors to ensure the secure splicing of adjacent lower pile components. Currently, there are various mechanical connection methods in use, including pin-type, clamp-type, screw-lock, and spring-loaded mechanical connections. A well-designed mechanical connection can provide reliable tensile bearing capacity and is therefore widely used in many projects. However, mechanical connections also have significant drawbacks: ① Mechanical connections require relatively high precision from the ends (end plates) of the precast piles and the mechanical connectors, and also demand high-quality on-site construction, often resulting in improper installation; ② While the tensile strength of mechanical connection joints can generally reach the pile body strength, their bending and shear strengths are often lower; ③ When using only mechanical connections, the probability of encountering Class III piles during small-scale deformation testing is relatively high.

[0006] Therefore, the structure of the foundation pit support system in the existing technology has room for further improvement. Utility Model Content

[0007] In view of this, and in response to the technical problems of insufficient bearing capacity and poor quality of the joint between two adjacent lower pile components in the prior art, this application provides a column structure for foundation pit protection. By setting a connection device, the connection strength, reliability and effectiveness of the connection between two adjacent lower pile components can be improved. It can also effectively improve the tensile, bending and shear strength of the connection, making the overall structure more robust, easier to construct and extending its service life.

[0008] To achieve the above objectives, this application provides the following technical solution: a column structure for foundation pit support, comprising: At least one lower pile member is installed below the basement floor slab; When there are two lower pile components, they are divided into a first support component and a second support component. The first support component is located between the bottom plate and the second support component. Both the first support component and the second support component have mounting grooves at their ends facing each other. The connecting device can be used to fix the first support member and the second support member together; The connecting device includes a connecting assembly and at least two end plates, the two end plates being located between the first support member and the second support member, and being anchored to the first support member and the second support member respectively; The connecting component is connected to two end plates, and the two ends of the connecting component are respectively located in the mounting grooves of the first support member and the second support member.

[0009] Compared with existing technologies, by setting up connecting components and end plates, with the two ends of the connecting components installed in the mounting grooves of the first and second support components respectively, and the end plates welded to the first and second support components respectively, the area at the connection interface can be increased, thereby effectively improving the load-bearing capacity of the connection. Compared with the structural instability caused by traditional welding and mechanical connections, it can improve the tensile, bending and shear strength of the connection, ensuring the overall stability and safety of the foundation pit support structure. The construction process is also simpler, further improving construction efficiency.

[0010] Preferably, the connecting assembly includes a first filler, a second filler, and a connector, wherein the first filler and the second filler are respectively connected to both ends of the connector and are respectively located in the mounting grooves of the first support member and the second support member; The first filler is at least partially connected to the end plate and at least partially connected to the inner wall of the first support member; The second filler is at least partially connected to the end plate and at least partially connected to the inner wall of the second support member.

[0011] In this embodiment, by providing a first filler, a second filler, and a connector, the connecting assembly can be tightly installed in the mounting groove, effectively transferring the load and preventing loosening or slippage at the connection.

[0012] Preferably, both the first filler and the second filler are made of high-strength grouting material, and the strength of the high-strength grouting material is ≥C80.

[0013] In this embodiment, the high-strength grout is made of high-strength materials as aggregates, cement as binder, and supplemented with substances that promote high fluidity, micro-expansion, and anti-segregation. The grout is ready to use after adding a certain amount of water and stirring evenly at the construction site. It has the characteristics of good self-flowability, rapid hardening, early strength, high strength, no shrinkage, micro-expansion, non-toxicity, harmlessness, non-aging, no pollution to water quality and the surrounding environment, good self-sealing, and rust prevention.

[0014] Preferably, both the first support member and the second support member are precast concrete piles.

[0015] In this embodiment, compared with traditional bored piles, precast concrete piles need to be prefabricated in the factory and then transported to the site for assembly. This ensures the quality of the piles, greatly improves the bearing capacity of the pile body, and effectively overcomes the shortcomings of insufficient bearing capacity caused by pile collapse and displacement in areas with poor soil conditions. It also facilitates on-site construction.

[0016] Preferably, the two end plates are welded together, and the shapes of the two end plates are the same as the cross-sectional shapes of the first support member and the second support member, respectively.

[0017] In this embodiment, the two end plates are welded together, so that the end plates and the two supporting members can fit tightly together, and the welded connection can enhance the stability and load-bearing capacity of the connection between the two.

[0018] Preferably, both end plates are provided with a plurality of spaced-apart reinforcing bar holes, and at least part of the reinforcing bars in the first and second supporting members are located in the reinforcing bar holes to achieve a fixed connection between the end plates and the first and second supporting members.

[0019] In this embodiment, at least part of the reinforcing bars in the first and second supporting members are located in the reinforcing bar holes to achieve a fixed connection between the end plate and the first and second supporting members. This can improve the integrity and connection strength of the connection between the first and second supporting members, and also enhance the tensile and shear resistance of the connecting components.

[0020] Preferably, the connecting assembly further includes a plurality of anchoring steel bars, which are welded to the end plate and are spaced apart on the outside of the connector; One end of each of the anchoring steel bars is welded to an end plate, and the other end is cast into a first or second support member.

[0021] In this embodiment, the anchoring steel bars are connected to the end plate by welding to form a rigid connection point, which can effectively transfer and distribute the load and enhance the overall stiffness and stability between the connection components and the supporting components.

[0022] Preferably, end sealing plates are welded to both ends of the connector, and the cross-sectional shape of the end sealing plates matches the cross-sectional shape of the central hole of the first support member and the second support member; The outer diameter of the end cap is larger than the outer diameter of the connector, but smaller than the inner diameter of the mounting groove.

[0023] In this embodiment, by setting an end cap, precise fit can be achieved, preventing the connector from shifting or loosening during installation. The matching cross-sectional shape maximizes the contact area between the connector and the first and second support components, which is conducive to uniform load transfer, reduces stress concentration, and improves the overall structure's load-bearing capacity and durability.

[0024] Preferably, it further includes a support beam and a grid member, wherein the support beam is disposed above the base plate and the grid member is located between the support beam and the first support member; A connecting device is also provided between the grid member and the first support member, and the connecting device is used to fix the grid member and the first support member in a fixed manner. A waterstop steel plate, which is horizontal and placed inside the base plate, is pre-welded to the middle of the grid component in the height direction.

[0025] In this embodiment, by setting up supporting beams and grid components, especially during the base slab construction stage, the grid components and waterstop steel plates are all manufactured in the factory and then transported to the construction site for assembly and finishing. This eliminates the need for on-site welding of the waterstop steel plates, ensuring welding quality, facilitating construction, and reducing on-site labor and time costs. When recycling the column structure, only a small amount of grid components above the base slab surface needs to be removed, thereby improving material utilization and reducing steel waste.

[0026] Preferably, the grid member and the first support member also have mounting grooves at their ends facing each other; The connecting device includes a connecting assembly and at least two end plates, the two end plates being located between the grid member and the first support member; One end plate is welded to the grid member, and the other end plate is anchored to the first support member; The connecting component is connected to two end plates, and the two ends of the connecting component are respectively located in the mounting slots of the grid member and the first support member.

[0027] In this embodiment, by setting a connecting component and an end plate, the two ends of the connecting component are respectively installed in the mounting grooves of the grid component and the first support component, which can increase the area at the connection interface between the two, thereby effectively improving the load-bearing capacity of the connection. Compared with the structural instability caused by traditional welding and mechanical connection, it can improve the tensile, bending and shear strength of the connection, ensuring the overall stability and safety of the foundation pit support structure, making the construction process simpler and further improving the construction efficiency. Attached Figure Description

[0028] Figure 1 A schematic diagram of a column structure for foundation pit protection provided in an embodiment of this application; Figure 2 A schematic diagram of the connection between the second supporting member and the connecting device in a column structure for foundation pit protection provided in an embodiment of this application; Figure 3 A partial structural schematic diagram of the connecting device in a column structure for foundation pit protection provided in an embodiment of this application; Figure 4 This is a top view of the connecting device in a column structure for foundation pit protection provided in an embodiment of this application; Figure 5 A structural schematic diagram of a steel grating member in a column structure for foundation pit protection provided in an embodiment of this application; Figure 6 This is a schematic diagram of the connecting components in a column structure for foundation pit protection provided in an embodiment of this application.

[0029] In the diagram: 1. Base plate; 2. First supporting member; 3. Second supporting member; 4. Connecting device; 5. Support beam; 6. Grid member; 7. Subbase; 41. Connecting component; 42. End plate; 61. Waterstop steel plate; 62. Angle steel; 63. Draping plate; 411. First filler; 412. Second filler; 413. Connector; 414. Anchoring reinforcement; 415. End cap; 421. Reinforcing bar hole. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0031] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0032] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0033] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 6 illustrate.

[0034] This embodiment provides a column structure for foundation pit support, which is applied in the field of building engineering technology. Specifically, for example... Figures 1 to 6As shown, it includes at least one lower pile component disposed below the basement floor slab 1. When there are two lower pile components, they are divided into a first support component 2 and at least one second support component 3. The first support component 2 is located between the floor slab 1 and the second support component 3. The first support component 2 and the second support component 3 are each provided with an installation groove at one end facing each other, and the installation groove is recessed in the direction away from the center of each other. A connecting device 4 is provided between the first support component 2 and the second support component 3. The connecting device 4 can be used to fix the first support component 2 and the second support component 3 to ensure the stability of the connection between the two. The connecting device 4 includes a connecting component 41 and at least two end plates 42. The two end plates 42 are located between the first supporting member 2 and the second supporting member 3, and are anchored to the first supporting member 2 and the second supporting member 3 respectively, which can increase the area at the connection interface and thus effectively improve the load-bearing capacity of the connection. The connecting component 41 is connected to the two end plates 42 and inserted into the two end plates 42. The two ends of the connecting component 41 are located in the mounting grooves of the first supporting member 2 and the second supporting member 3 respectively. Through the cooperation of the connecting component 41 with the mounting groove at least part, the connection strength of the two can be strengthened, so that the first supporting member 2 and the second supporting member 3 can work together better when under stress to resist external loads. Compared with the structural instability caused by traditional simple welding and mechanical connection, it can improve the tensile, bending and shear strength of the connection, ensure the overall stability and safety of the foundation pit support structure, simplify the construction process, and further improve the construction efficiency. By adopting the connection method of this connection device 4, it can be widely applied to other engineering structures, such as the connection between precast retaining piles and walls, as well as the connection between piles and other structural components. When the length of a component in a certain direction is large, multiple similar connection nodes can be set in the corresponding direction.

[0035] Among them, the first support component 2 and the second support component 3 are both precast concrete piles. Compared with traditional bored piles, precast concrete piles need to be prefabricated in the factory and then transported to the site for assembly. This ensures the quality of the piles and greatly improves the bearing capacity of the pile body. It also overcomes the shortcomings of insufficient bearing capacity caused by pile collapse and displacement in areas with poor soil quality, and facilitates on-site construction.

[0036] The two end plates 42 are welded together. The shapes of the two end plates 42 are the same as the cross-sectional shapes of the first support member 2 and the second support member 3, respectively, so that the end plates 42 can fit tightly with the two support members, and the welded connection can enhance the stability and load-bearing capacity of the connection between the two.

[0037] Furthermore, such as Figures 1 to 3As shown, the connecting assembly 41 includes a first filler 411, a second filler 412, and a connector 413. The first filler 411 and the second filler 412 are respectively connected to both ends of the connector 413 and are located in the mounting grooves of the first support member 2 and the second support member 3, respectively. The first filler 411 is located between the first support member 2 and the connector 413, and the second filler 412 is located between the second support member 3 and the connector 413, so that the connecting assembly 41 can be tightly installed in the mounting groove, effectively transferring loads and preventing loosening or slippage at the connection. The first filler 411 is at least partially connected to the end plate 42 and at least partially connected to the inner wall of the first support member 2. The second filler 412 is at least partially connected to the end plate 42 and at least partially connected to the inner wall of the second support member 3, which ensures the stability, reliability, effectiveness, and mechanical properties of the connection between the first support member 2 and the second support member 3.

[0038] The first filler 411 and the second filler 412 are both made of high-strength grouting material with a strength ≥ C80. The first filler 411 is cast together with the first support component 2 during factory processing, and the second filler 412 is cast and fixed during the assembly of the first support component 2 and the second support component 3. The high-strength grouting material is made of high-strength material as aggregate, cement as binder, and supplemented with substances that have high fluidity, micro-expansion, and anti-segregation properties. The grouting material can be used after adding a certain amount of water and stirring evenly at the construction site. It has the characteristics of good self-flowability, fast hardening, early strength, high strength, no shrinkage, micro-expansion, non-toxicity, harmlessness, non-aging, no pollution to water quality and the surrounding environment, good self-sealing, and rust prevention. The outside of the connector 413 is wrapped by the first filler 411 and the second filler 412, which can effectively isolate groundwater and ensure the durability and corrosion resistance of the connector 413.

[0039] Among them, such as Figure 6 As shown, the connector 413 is a steel component, which can be a circular steel pipe. End sealing plates 415 are welded to both ends of the connector 413. The cross-sectional shape of the end sealing plates 415 matches the cross-sectional shape of the central holes of the first support member 2 and the second support member 3, enabling precise fit and preventing the connector 413 from shifting or loosening during installation. The matching cross-sectional shape maximizes the contact area between the connector 413 and the first and second support members 3, facilitating uniform load transfer, reducing stress concentration, and improving the overall structural load-bearing capacity and durability. The outer diameter of the connector 413 is smaller than the inner diameter of the mounting groove, while the outer diameter of the end sealing plates 415 is larger than the outer diameter of the connector 413 but smaller than the inner diameter of the mounting groove, ensuring that the connector 413 can be accurately installed within the mounting cavity.

[0040] Furthermore, such as Figures 2 to 4 As shown, both end plates 42 are provided with a plurality of spaced rebar holes 421. At least part of the rebars in the first support member 2 and the second support member 3 are located in the rebar holes 421. The rebar holes 421 allow at least part of the rebars in the first support member 2 and the second support member 3 to pass through, so as to realize the fixed connection between the end plate 42 and the first support member 2 and the second support member 3. This can improve the integrity and connection strength of the connection between the first support member 2 and the second support member 3, and also enhance the tensile and shear resistance of the connecting assembly 41.

[0041] Furthermore, such as Figures 3 to 4 As shown, the connecting assembly 41 also includes multiple anchoring steel bars 414, which are welded to the end plate 42 and spaced apart on the outside of the connector 413, located between the connector 413 and the steel bar holes 421. The anchoring steel bars 414 are welded to the end plate 42 to form a rigid connection point, which can effectively transfer and distribute loads, and enhance the overall stiffness and stability between the connecting assembly 41 and the supporting member. One end of the multiple anchoring steel bars 414 is welded to the end plate 42, and the other end is cast into the first supporting member 2 or the second supporting member 3 to form bidirectional anchoring. This ensures that the first supporting member 2 and the second supporting member 3 have a strong resistance to horizontal and tensile forces, ensures the stability of the connector 413 under stress, enhances the load-bearing capacity and shear resistance of the connection area, and improves the safety and durability of the overall structure.

[0042] Furthermore, such as Figure 1 , Figure 5As shown, it also includes a support beam 5 and a grid member 6. The grid member 6 is a precast steel grid member. The support beam 5 is arranged parallel to the top of the base plate 1. The grid member 6 is located between the support beam 5 and the first support member 2. One end of the grid member 6 is at least partially connected to the support, and the other end of the grid member 6 is connected to the first support member 2. A connecting device 4 is also provided between the grid member 6 and the first support member 2. The connecting device 4 is used to fix the grid member 6 and the first support member 2. By setting the connecting device 4, the connection strength between the grid member 6 and the first support member 2 can be strengthened, the load-bearing capacity and shear resistance of the connection area can be enhanced, and the safety and durability of the overall structure can be improved. A water-stop steel plate 61 for placement inside the base plate 1 and in a horizontal direction is pre-welded to the middle of the grid member 6 in the height direction. The water-stop steel plate 61 basically blocks water in the soil below the base plate 1 from seeping upward into the basement above the base plate 1 through the four angle steels 62 of the grid member 6. Especially during the construction phase of the base slab 1, the grid components 6 and the waterstop steel plate 61 were manufactured in the factory and then transported to the construction site for assembly and finishing. This eliminated the need for on-site welding of the waterstop steel plate 61, ensuring welding quality, facilitating construction, and reducing on-site labor and time costs. During the recycling of the column structure, only a small amount of the grid components 6 above the base slab 1 needs to be removed, thereby improving material utilization and reducing steel waste.

[0043] The grid member 6 and the first support member 2 are also provided with mounting grooves at their respective ends, which are recessed away from each other's centers. The connecting device 4 includes a connecting component 41 and at least two end plates 42. The two end plates 42 are located between the grid member 6 and the first support member 2. One end plate 42 is welded to the grid member 6, and the other end plate 42 is anchored to the first support member 2, which can increase the area at the connection interface and thus effectively improve the load-bearing capacity at the connection. The bottom of the base plate 1 is provided with a pad 7. The end plate 42 welded to the grid member 6 is at least partially in contact with the pad 7. The two end plates 42 are welded to each other, and the shape of the two end plates 42 is similar to that of the first support member 2. The cross-sectional shape of the components 2 is the same. The connecting component 41 is connected to the two end plates 42 and inserted into the two end plates 42. The two ends of the connecting component 41 are respectively located in the mounting grooves of the grid component 6 and the first support component 2. By cooperating with the mounting groove at least partially, the connection strength between the two can be strengthened, so that the first support component 2 and the grid component 6 can work together better when under stress to resist external loads. Compared with the structural instability caused by traditional simple welding and mechanical connection, it can improve the tensile, bending and shear strength of the connection, ensure the overall stability and safety of the foundation pit support structure, and make the construction process simpler, further improving the construction efficiency.

[0044] The connecting component 41 includes a first filler 411, a second filler 412, and a connector 413. Each leg of the grid component 6 is an angle steel 62. For example, if there are four angle steels 62, a water-stop steel plate 61 needs to be welded to both the concave and convex parts of the angle steel 62. The two water-stop steel plates 61 together form a rectangular water-stop steel plate 61. Multiple connecting plates 63 (also called transverse connecting plates) are also welded to the four angle steels 62 of the grid component 6. The connecting plates 63 facing the first supporting component 2 are raised and their bottoms are parallel to the bottoms of the angle steels 62. The angle steels 62 are used for bearing and transmitting force, and the connecting plates 63 are used to ensure the integrity of the grid component 6. The connection between the grid component 6 and the first support component 2 is a grout anchor connection. The grid component 6 is pre-embedded with the connector 413 during factory prefabrication, and an end plate 42 is welded to the bottom end of the angle steel 62 of the grid component 6 (the end closest to the first support component 2). The prefabricated grid component 6 is inserted into the installation groove of the first support component 2 and grout is injected. At the same time, the end plates 42 of the first support component 2 and the grid component 6 are welded.

[0045] It should be noted that the connecting device 4 located between the grid member 6 and the first support member 2 is the same as the connecting device 4 located between the first support member 2 and the second support member 3, and their assembly methods are also the same. The rest will not be described in detail.

[0046] The construction method of this application is as follows: Step S1: According to the needs of the foundation pit project, complete the prefabrication of the first support component 2, the second support component 3, and the grid component 6; Step S2: Sink the second support member 3 until its top (pile head) is 0.5m to 1.0m above the ground. Grout the installation groove of the second support member 3. Insert the first support member 2 into the second support member 3 according to the design requirements. Weld the second support member 3 to the end plate 42. Step S3: Continue to lower the first support member 2 to the design elevation (the number of pile sections is determined according to the actual situation). Step S4: Insert the connector 413 at one end of the grid member 6 into the mounting groove of the first support member 2 as required, and weld the end plate 42 of the grid member 6 and the first support member 2. In step S5, the other end of the grid member 6 is fixedly connected to the support beam 5; Step S6: After excavating to the bottom elevation of the foundation layer 7, tie the reinforcing bars of the bottom slab 1 and pour the reinforced concrete of the bottom slab 1. When pouring the concrete, the waterstop steel plate 61 pre-welded to the grid member 6 is poured together with the bottom slab 1. Step S7: Once the base plate 1 reaches the required strength, remove the support beam 5 and cut off the portion of the grid member 6 above the top surface of the base plate 1 one by one.

[0047] The above construction steps clarify the coordination between various components during construction, making it easier for construction workers to operate, saving time, reducing costs, and reducing errors, thus greatly improving construction efficiency.

[0048] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A column structure for foundation pit support, characterized in that, include: At least one lower pile member is installed below the basement floor slab (1); When there are two lower pile components, they are divided into a first support component (2) and a second support component (3). The first support component (2) is located between the bottom plate (1) and the second support component (3). The first support component (2) and the second support component (3) are provided with mounting grooves at their ends facing each other. The connecting device (4) can be used to fix the first support member (2) and the second support member (3); The connecting device (4) includes a connecting component (41) and at least two end plates (42). The two end plates (42) are located between the first support member (2) and the second support member (3) and are anchored to the first support member (2) and the second support member (3) respectively. The connecting component (41) is connected to two end plates (42), and the two ends of the connecting component (41) are respectively located in the mounting grooves of the first support member (2) and the second support member (3).

2. The column structure for foundation pit protection according to claim 1, characterized in that, The connecting assembly (41) includes a first filler (411), a second filler (412), and a connector (413). The first filler (411) and the second filler (412) are respectively connected to the two ends of the connector (413) and are respectively located in the mounting grooves of the first support member (2) and the second support member (3). The first filler (411) is at least partially connected to the end plate (42) and at least partially connected to the inner wall of the first support member (2); The second filler (412) is at least partially connected to the end plate (42) and at least partially connected to the inner wall of the second support member (3).

3. The column structure for foundation pit protection according to claim 2, characterized in that, Both the first filler (411) and the second filler (412) are made of high-strength grouting material, and the strength of the high-strength grouting material is ≥C80.

4. The column structure for foundation pit protection according to claim 1, characterized in that, Both the first support member (2) and the second support member (3) are precast concrete piles.

5. The column structure for foundation pit protection according to claim 1, characterized in that, The two end plates (42) are welded together, and the shapes of the two end plates (42) are the same as the cross-sectional shapes of the first support member (2) and the second support member (3), respectively.

6. The column structure for foundation pit protection according to claim 1, characterized in that, Both end plates (42) are provided with a plurality of spaced steel bar holes (421), and the steel bars in the first support member (2) and the second support member (3) are at least partially located in the steel bar holes (421) to achieve a fixed connection between the end plate (42) and the first support member (2) and the second support member (3).

7. The column structure for foundation pit protection according to claim 1, characterized in that, The connecting assembly (41) also includes a plurality of anchoring steel bars (414), which are welded to the end plate (42) and are spaced apart on the outside of the connector (413); One end of each of the anchoring steel bars (414) is welded to the end plate (42), and the other end is cast into the first support member (2) or the second support member (3).

8. The column structure for foundation pit protection according to claim 2, characterized in that, The connector (413) has end sealing plates (415) welded to both ends respectively, and the cross-sectional shape of the end sealing plates (415) matches the cross-sectional shape of the center hole of the first support member (2) and the second support member (3). The outer diameter of the end cap (415) is larger than the outer diameter of the connector (413) and smaller than the inner diameter of the mounting groove.

9. The column structure for foundation pit protection according to claim 1, characterized in that, It also includes a support beam (5) and a grid member (6), wherein the support beam (5) is disposed above the base plate (1) and the grid member (6) is located between the support beam (5) and the first support member (2); A connecting device (4) is also provided between the grid member (6) and the first support member (2). The connecting device (4) is used to fix the grid member (6) and the first support member (2). A waterstop steel plate (61) for placement inside the base plate (1) and in a horizontal direction is pre-welded to the middle of the grid member (6) in the height direction.

10. The column structure for foundation pit protection according to claim 9, characterized in that, The grid member (6) and the first support member (2) are also provided with mounting grooves at their ends facing each other; The connecting device (4) includes a connecting assembly (41) and at least two end plates (42), the two end plates (42) being located between the grid member (6) and the first support member (2); One end plate (42) is welded to the grid member (6), and the other end plate (42) is anchored to the first support member (2); The connecting component (41) is connected to two end plates (42), and the two ends of the connecting component (41) are located in the mounting slots of the grid member (6) and the first support member (2), respectively.

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