A foundation pit support structure

Abstract

This application relates to a foundation pit support structure, specifically within the technical field of foundation pit support. It includes a plurality of adjacent and connected Larssen sheet piles, which abut against the inner wall of the foundation pit. A support mechanism is provided within the foundation pit. The support mechanism includes a support plate abutting against the inner wall of the Larssen sheet piles, and a top plate abutting at the connection points of adjacent Larssen sheet piles. The support mechanism also includes a support seat disposed within the foundation pit, with a top support assembly on the support seat. The support plate pushes the top plate against the Larssen sheet piles via the top support assembly. This application improves the support capacity of the sheet piles and reduces the potential for damage to the sheet piles.

Description

Technical Field

[0001] This application relates to the field of foundation pit support, and in particular to a foundation pit support structure. Background Technology

[0002] Foundation pit support refers to the measures taken to support, reinforce, and protect the sidewalls and surrounding environment to ensure the safety of underground structure construction and the surrounding environment. One type of foundation pit support is the use of steel sheet piles to support the inner sidewalls of the foundation pit.

[0003] Steel sheet piles are hot-rolled or cold-formed steel sections with interlocking or clamping jaws. After being driven into the ground, they interlock and interlock to form a continuous steel sheet pile retaining wall, used for soil and water retention. They are characterized by rapid construction, the ability to be removed and recycled after foundation pit construction, and good economic efficiency, and have been widely used in water conservancy, transportation, and other industries.

[0004] Due to the long-term pressure from the soil and water outside the foundation pit on the steel sheet piles, the steel sheet piles are prone to deformation and damage, which can cause the soil or water outside the foundation pit to enter the foundation pit and interfere with the construction. Summary of the Invention

[0005] The purpose of this application is to provide a foundation pit support structure to improve the support capacity of sheet piles and reduce the possibility of damage to sheet piles.

[0006] The technical solution for a foundation pit support structure provided in this application is as follows:

[0007] A foundation pit support structure includes a plurality of adjacent and connected Larssen sheet piles, which abut against the inner wall of the foundation pit. A support mechanism is provided in the foundation pit, the support mechanism including a support plate abutting against the inner wall of the Larssen sheet piles, and a top plate abutting against the connection of adjacent Larssen sheet piles. The support mechanism also includes a support seat disposed in the foundation pit, and a top support assembly is provided on the support seat. The support plate pushes the top plate against the Larssen sheet piles through the top support assembly.

[0008] By adopting the above technical solution, the support plate rests on the inner wall of the Larssen sheet piles, and the top plate rests at the connection point of two adjacent Larssen sheet piles. Supported by the support base, the support plate and top plate are connected by a top support assembly, applying support force to the Larssen sheet piles and adjacent Larssen sheet piles. The top plate, while supporting two adjacent Larssen sheet piles, also seals the connection gap between them, thereby reducing the inflow of water into the foundation pit through the gap between adjacent Larssen sheet piles. When the soil and water outside the foundation pit compress the Larssen sheet piles, the Larssen sheet piles push into the foundation pit. The section is tilted, and at the same time, the Larssen sheet piles exert a thrust on the support plate, the support seat provides support to the support plate, and the support plate exerts a thrust on the top plate through the top support assembly. The top plate thus exerts a thrust to support the Larssen sheet piles at the connection of adjacent Larssen sheet piles. By utilizing the compressive force of the Larssen sheet piles on the support plate, the support force of the top plate on the Larssen sheet piles is increased. Similarly, the top plate also provides support force to the support plate, thereby improving the support capacity of the Larssen sheet piles, reducing the possibility of damage to the Larssen sheet piles, and at the same time, because the contact between the top plate and the Larssen sheet is tighter, the possibility of water seepage is further reduced.

[0009] Optionally, the top support assembly includes a support rod, one end of which is hinged to the support plate, and the other end is rotatably and slidably connected to a slider. The slider is slidably connected within the support base, and the sliding direction is horizontally toward the Larssen sheet pile. The middle section of the support rod is rotatably connected to the support base, and the slider is provided with a drive component for driving the top plate to press against the Larssen sheet pile.

[0010] By adopting the above technical solution, when the Larssen sheet piles apply thrust to the support plate, the support rod pushes the support rod, and the end of the support rod near the support plate rotates towards the support seat. The end of the support rod located in the support seat drives the slider to move towards the Larssen sheet piles. Thus, the slider, through the driving component, makes the top plate press against two adjacent Larssen sheet piles, thereby improving the support capacity of the Larssen sheet piles.

[0011] Optionally, the driving component includes a driving rod connected to the top plate. One end of the driving rod away from the top plate passes through and is slidably connected to the support base, and the other end of the driving rod located inside the support base abuts against the side wall of the slider. The contact surface between the driving rod and the slider is set as an inclined surface. When the slider approaches the support plate, the slider pushes the top plate against the Larssen sheet pile through the driving rod.

[0012] By adopting the above technical solution, when the slider moves toward the Larssen sheet pile, the slider applies a thrust to the drive rod through the inclined surface, the drive rod moves toward the direction of disengaging from the support seat, and presses the top plate against the connection of two adjacent Larssen sheet piles, thereby providing support for the Larssen sheet pile.

[0013] Optionally, the support base is provided with a support spring, and the two ends of the support spring are respectively connected to two drive rods.

[0014] By adopting the above technical solution, when the slider pushes the two drive rods to separate, the support spring is in a stretched state, so the drive rod always abuts against the slider. When the soil outside the foundation pit tilts away from the Larssen sheet pile, the two drive rods approach each other under the action of the support spring and push the slider to move away from the Larssen sheet pile. The sliding drives the support plate through the support rod to push the Larssen sheet pile, thereby making the Larssen sheet pile abut against the side wall of the soil outside the foundation pit, maintaining support for the outside of the foundation pit.

[0015] Optionally, the drive rod is inclined, and the end of the drive rod near the top plate gradually tilts upward.

[0016] By adopting the above technical solution, when the drive rod pushes the top plate against the Larssen sheet pile, the Larssen sheet pile applies a reaction force to the top plate and the drive rod. As a result, the drive rod applies a downward pressure to the slider and the support seat, thereby providing a downward vertical component force to the support seat, thus improving the stability of the support seat and enhancing the overall support performance of the foundation pit support structure.

[0017] Optionally, connecting rods are provided on both sides of the slider, and a pressure block is provided at the end of the connecting rod away from the support seat. The pressure block abuts against the outer wall of the Larssen sheet pile, and a connecting component is provided between the pressure blocks on the same Larssen sheet pile.

[0018] By adopting the above technical solution, when the support plate supports the Larssen sheet pile and drives the slider to move towards the Larssen sheet pile, the slider drives the pressure block to move synchronously, and the pressure block applies pressure to the adjacent Larssen sheet pile, so that the Larssen sheet pile is subjected to the same supporting force, thereby reducing the possibility of damage and deformation of the Larssen sheet pile. The connecting component connects the pressure blocks on different support seats, thereby forming an integral structure and improving the overall support capacity inside the foundation pit.

[0019] Optionally, the connecting assembly includes a positioning rod disposed on the pressure block, a limiting block disposed at the end of the positioning rod away from the pressure block, a positioning groove corresponding to the positioning rod disposed on the pressure block, the positioning rod being inserted into the positioning groove, and a limiting groove communicating with the positioning groove disposed inside the pressure block, the limiting block being engaged in the limiting groove and sliding along the limiting groove.

[0020] By adopting the above technical solution, the positioning rod and positioning groove are interlocked, allowing the pressure blocks to connect with each other and remain on the same straight line, thereby completing the overall support of the Larssen sheet pile. In addition, the cooperation between the limiting groove and the limiting block makes it difficult for the positioning rod to disengage from the positioning groove. At the same time, the limiting block slides along the limiting groove, allowing a certain sliding space between adjacent pressure blocks, thereby reducing the possibility of deformation and damage to the positioning rod due to the unbalanced force applied by the Larssen sheet pile to the pressure block.

[0021] Optionally, the support base is further provided with a buffer spring, which is connected between the support base and the slider.

[0022] By adopting the above technical solution, the buffer spring can convert the force applied to the slider by the support rod or drive rod into elastic potential energy, thereby reducing the instantaneous impact force on the slider and playing a buffering role, further reducing the impact on the support seat and improving the stability of the support seat.

[0023] Optionally, the top plate is provided with a water-absorbing layer on the side near the connection of the adjacent Larssen sheet piles, and water-sealing strips are provided at the edges of both sides of the water-absorbing layer. The water-sealing strips and the water-absorbing layer are both pressed against the Larssen sheet piles.

[0024] By adopting the above technical solution, the water-absorbing layer and the water-sealing strip abut against the Larssen steel sheet pile, thereby sealing the gap at the connection of adjacent Larssen steel sheet piles. When water flows from the gap into the foundation pit, the water-absorbing layer first contacts and absorbs the water. Subsequently, the water-sealing strips on both sides of the water-absorbing layer block the water in the water-absorbing layer, making it difficult for the water to pass through and reducing the possibility of water entering the foundation pit.

[0025] Optionally, a connecting pipe is provided between the two opposing support seats. Each end of the connecting pipe is provided with a limiting component. The limiting component includes an upper pressure plate and a lower pressure plate that respectively clamp the upper and lower sides of the connecting pipe. A U-shaped nail is provided between the upper pressure plate and the lower pressure plate to connect the two. A support column is provided below the lower pressure plate. An upper pressure rod is hinged between the two upper pressure plates and a lower pressure rod is hinged between the two lower pressure plates. A fixing column is also provided inside the foundation pit, which is simultaneously hinged to the upper pressure rod and the lower pressure rod.

[0026] By adopting the above technical solution, when one of the connecting pipes tilts due to external force, one end of the connecting pipe presses down on the lower pressure plate. This lower pressure plate applies an upward thrust to the other lower pressure plate through the lower pressure rod. Since the lower pressure plate connects all the connecting pipes, the thrust can be dispersed, thereby maintaining the stability of the originally tilted connecting pipe. The other end of the connecting pipe pushes up on the upper pressure plate. Similarly, the other connecting pipes apply downward pressure to the tilted end of the connecting pipe through the upper pressure plate, thereby maintaining the overall stability of the connecting pipe and thus providing stable support to the side wall of the foundation pit.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By utilizing the pressure on the Larssen sheet piles from outside the foundation pit, the support mechanism applies support force to the Larssen sheet piles from inside the foundation pit, further improving the foundation pit support capacity and reducing the possibility of damage to the Larssen sheet piles;

[0029] 2. The top slab seals the gap between two adjacent Larssen sheet piles, reducing water inflow into the foundation pit, improving the cleanliness of the foundation pit interior, and thus improving the construction efficiency of the foundation pit;

[0030] 3. Connecting components link adjacent support structures, thereby providing overall support for Larssen sheet piles and improving support capacity. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0032] Figure 2 This is a schematic diagram of the support mechanism of Embodiment 1 of this application;

[0033] Figure 3 This is a schematic diagram of the top support component of Embodiment 1 of this application;

[0034] Figure 4 This is a schematic diagram of the support rod in Embodiment 1 of this application;

[0035] Figure 5 This is a schematic diagram of the overall structure of Embodiment 2 of this application;

[0036] Figure 6 This is a schematic diagram of the limiting component of Embodiment 2 of this application;

[0037] In the diagram, 1. Excavation pit; 2. Larssen sheet piles; 3. Support mechanism; 31. Support plate; 32. Top plate; 321. Absorbent layer; 322. Water sealing strip; 33. Support base; 34. Top support assembly; 341. Slider; 3411. Slide groove; 342. Support rod; 3421. Moving rod; 3422. Rotating rod; 343. Drive rod; 344. Push plate; 345. Support spring; 346. Buffer spring; 35. Connecting rod; 36. Pressure block; 361. Positioning groove; 362. Limiting groove; 37. Connecting assembly; 371. Positioning rod; 372. Limiting block; 4. Limiting assembly; 41. Upper pressure plate; 42. Lower pressure plate; 43. U-shaped nail; 44. Stop block; 45. Positioning spring; 46. Support column; 47. Fixed column; 48. Upper pressure rod; 49. Lower pressure rod. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0039] Example 1: A foundation pit support structure, referring to Figure 1 and Figure 2 The structure includes a foundation pit 1, on both sides of which are inserted multiple Larssen sheet piles 2. Adjacent Larssen sheet piles 2 are interlocked and abut against the sidewalls of the foundation pit 1. The Larssen sheet piles 2 are U-shaped, with some protruding outwards from the foundation pit 1 and the remaining protruding inwards from the foundation pit 1.

[0040] Reference Figure 2 and Figure 3 The foundation pit 1 contains multiple support mechanisms 3, each corresponding to a Larssen sheet pile 2 protruding outwards from the foundation pit 1. Each support mechanism 3 includes two support plates 31, distributed vertically. One side of each support plate 31 abuts against the concave side wall of a Larssen sheet pile 2, and the other side of each support plate 31 has a support seat 33 installed at the bottom of the foundation pit 1. The support mechanism 3 also includes top plates 32 located on both sides of the support plates 31. The top plates 32 are at the same height as the Larssen sheet piles 2 inside the foundation pit 1, and abut against the connection point of two adjacent Larssen sheet piles 2, i.e., the top plates 32 simultaneously abut against two Larssen sheet piles 2, sealing the gap at the connection point. The support mechanism 3 also includes a top support assembly 34 mounted on the support seat 33, connecting the support plates 31 and the top plates 32.

[0041] The support base 33 has a cavity, and the top support assembly 34 includes two sliders 341 disposed in the cavity. The sliders 341 are distributed vertically and are slidably connected to the support base 33, with the sliding direction horizontally towards the Larssen sheet pile 2. The top support assembly 34 also includes support rods 342 corresponding to the support plates 31. One end of each support rod 342 is hinged to the corresponding support plate 31, and the other end passes through the cavity of the support base 33. Rotating rods 3422 are rotatably connected to the middle sections of both support rods 342. The rotating rods 3422 are fixedly connected to the support base 33, and the two support rods 342 are arranged crosswise to form an X shape.

[0042] Reference Figure 3 and Figure 4 The end of the support rod 342 away from the support plate 31 is fixedly connected to a horizontally perpendicular moving rod 3421. The slider 341 has a vertically arranged groove 3411. In the horizontal section of the slider 341, the groove 3411 is set in a cross shape. The moving rod 3421 is inserted into the groove 3411 and slides along the groove 3411. The support base 33 is provided with a driving component that connects the slider 341 and the top plate 32.

[0043] When the soil outside the pit 1 compresses the Larssen sheet pile 2, the upper and lower support plates 31 can provide effective support for the Larssen sheet pile 2. That is, when the upper part of the Larssen sheet pile 2 is compressed, the upper support plate 31 provides support for the Larssen sheet pile 2, and similarly, the lower support plate 31 supports the lower part of the Larssen sheet pile 2. The Larssen sheet pile 2 applies pressure to the support plate 31 toward the inside of the pit 1. The support plate 31 pushes the support rod 342 to rotate. When the support rod 342 rotates, it drives the moving rod 3421 to rotate and slide along the slide groove 3411, thereby driving the slider 341 to move toward the support plate 31. The slider 341 then pushes the top plate 32 through the driving component, so that the top plate 32 applies a supporting force to the Larssen sheet pile 2 toward the outside of the pit 1.

[0044] Reference Figure 2 and Figure 3 The driving component includes driving rods 343 disposed on both sides of the sliders 341. One end of the driving rod 343 is fixedly connected to the top plate 32 and perpendicular to the side wall of the Larssen sheet pile 2 at that position. The other end passes through the cavity of the support base 33 and is fixedly connected to a push plate 344. The push plate 344 is located in the cavity and abuts against both sliders 341. The abutment surface between the push plate 344 and the sliders 341 is set as an inclined surface, which is perpendicular to the moving direction of the driving rod 343. A support spring 345 is provided between the two push plates 344 and fixedly connected to both. A buffer spring 346 is fixedly connected to the end of the slider 341 away from the support plate 31. The end of the buffer spring 346 away from the slider 341 is fixedly connected to the support base 33.

[0045] When the slider 341 moves closer to the support plate 31, the slider 341 pushes the two drive rods 343 to separate from each other and applies a thrust to the top plate 32. As a result, the top plate 32 supports two adjacent Larssen sheet piles 2. In this way, the top support assembly 34 converts the pressure on the support plate 31 into the supporting force of the top plate 32 on the Larssen sheet piles 2. At the same time, it uses the reaction force to maintain the supporting effect of the support plate 31 on the Larssen sheet piles 2, so that the Larssen sheet piles 2 are supported as a whole, thereby reducing the possibility of damage to the Larssen sheet piles 2.

[0046] The drive rod 343 is inclined in the vertical direction and gradually tilts upward towards the top plate 32. When the drive rod 343 supports the top plate 32, the reaction force of the top plate 32 on the drive rod 343 can be decomposed into a vertically downward pressure, thereby increasing the pressure of the support seat 33 on the bottom of the pit 1 and thus improving the stability of the pit support structure.

[0047] Additionally, a water-absorbing layer 321 is fixedly connected to the side of the top plate 32 near the Larssen sheet piles 2. The water-absorbing layer 321 abuts against the connection of two adjacent Larssen sheet piles 2 and is used to absorb the seeping water. Water-sealing strips 322 are fixed on both sides of the water-absorbing layer 321 and are set along the edge of the water-absorbing layer 321. The water-sealing strips 322 are fixedly connected to the top plate 32. One water-sealing strip 322 abuts against the side wall of one Larssen sheet pile 2 and the other water-sealing strip 322 abuts against the side wall of another Larssen sheet pile 2. Thus, the two water-sealing strips 322 seal the water in the water-absorbing layer 321.

[0048] Connecting rods 35 are fixedly connected to both ends of the slider 341. The end of the connecting rod 35 away from the slider 341 extends through the support base 33. The support base 33 has an oblong hole. The connecting rod 35 passes through the oblong hole and slides along the oblong hole in the same direction as the slider 341. A pressure block 36 is fixedly connected to the end of the connecting rod 35 away from the support base 33. The pressure block 36 abuts against the side of the Larssen sheet pile 2 protruding into the pit 1. The pressure blocks 36 on two adjacent support mechanisms 3 abut against each other and simultaneously support the same Larssen sheet pile 2 protruding into the pit 1. When the slider 341 moves closer to the support plate 31, the connecting rod 35 drives the pressure block 36 to move synchronously, thereby providing support for the adjacent Larssen sheet pile 2.

[0049] A connecting assembly 37 is provided between two pressure blocks 36 on the same Larssen sheet pile 2. The connecting assembly 37 includes three positioning rods 371 fixedly connected to the pressure blocks 36. At the same time, three positioning slots 361 are also provided on the pressure blocks 36. The positioning rods 371 and positioning slots 361 are evenly arranged around the center line of the pressure blocks 36, and a positioning slot 361 is provided between two adjacent positioning rods 371. When the pressure blocks 36 on the same Larssen sheet pile 2 abut against each other, the positioning slots on one pressure block 36 are... The rod 371 is inserted into the positioning groove 361 on another pressure block 36. The end of the positioning rod 371 away from the pressure block 36 is fixedly connected to the limiting block 372. The limiting block 372 is spherical and has a certain elasticity. The pressure block 36 has a limiting groove 362 inside, which is connected to the positioning groove 361. When the positioning rod 371 is inserted into the positioning groove 361, the limiting block 372 is inserted into the limiting groove 362, and the limiting block 372 can slide in the limiting groove 362.

[0050] Thus, the pressure block 36 on the same Larssen sheet pile 2 is connected by the positioning rod 371 and the limiting block 372, so that all the support mechanisms 3 are connected as a whole, improving the stability of the support.

[0051] Reference Figure 1 and Figure 2To improve the overall support performance, a support pipe is fixedly connected to the side of the support base 33 away from the support plate 31. A flange is fixedly connected to the end of the support pipe away from the support base 33. A connecting pipe is provided between the two opposing support bases 33. The connecting pipe is connected to the two support pipes through the flange, thereby quickly completing the support work.

[0052] The implementation principle of Embodiment 1 of this application is as follows: the support plate 31 is supported on the inner side of the Larssen sheet pile 2, the top plate 32 is supported on the outer side of two adjacent Larssen sheet piles 2, and the pressure block 36 is supported on the outer side of the Larssen sheet pile 2 adjacent to the Larssen sheet pile 2 where the support plate 31 is located. When the Larssen sheet pile 2 is squeezed by the outside of the pit 1 and puts pressure on the support plate 31, the support plate 31 drives the slider 341 to move towards the support plate 31, thereby driving the top plate 32 and the pressure block 36 to support the Larssen sheet pile 2 at the same time, reducing the possibility of damage and deformation of the Larssen sheet pile 2.

[0053] Example 2: Refer to Figure 5 and Figure 6 The difference from Embodiment 1 is that both ends of the connecting pipe are provided with limiting components 4. The limiting components 4 include an upper pressure plate 41 located above the connecting pipe and a lower pressure plate 42 located below the connecting pipe. Both the upper pressure plate 41 and the lower pressure plate 42 simultaneously abut against the connecting pipe. A U-shaped nail 43 is provided above the upper pressure plate 41. Both ends of the U-shaped nail 43 simultaneously pass through the upper pressure plate 41 and the lower pressure plate 42. The middle of the U-shaped nail 43 abuts against the upper side of the upper pressure plate 41. A stop block 44 is threaded to one end of the U-shaped nail 43 that passes through the lower pressure plate 42. A positioning spring 45 is sleeved on the U-shaped nail 43. One end of the positioning spring 45 is fixed to the stop block 44, and the other end is fixed to the inclined side of the lower pressure plate 42.

[0054] Below the connecting pipe, there is a support column 46 corresponding to the lower pressure plate 42. One end of the support column 46 is inserted and fixed to the bottom of the foundation pit 1, and the other end is fixed to the lower side wall of the lower pressure plate 42. Between two adjacent connecting pipes, there is also a fixing column 47 fixed to the bottom of the foundation pit 1. The fixing column 47 is hinged with an upper pressure rod 48 and a lower pressure rod 49 distributed from top to bottom. The two ends of the upper pressure rod 48 are respectively hinged to the two upper pressure plates 41, and the two ends of the lower pressure rod 49 are respectively hinged to the two lower pressure plates 42. When one of the connecting pipes is subjected to pressure, the upper pressure rod 48 is fixed to the bottom of the foundation pit 1, and the lower pressure rod 49 is fixed to the bottom of the foundation pit 1 ... When the connecting pipe tilts due to external force, one end of the connecting pipe presses down on the lower pressure plate 42. This lower pressure plate 42 applies an upward thrust to another lower pressure plate 42 through the lower pressure rod 49. Since the lower pressure plate 42 connects all the connecting pipes, the thrust can be dispersed, thereby maintaining the stability of the originally tilted connecting pipe. The other end of the connecting pipe pushes up on the upper pressure plate 41. Similarly, other connecting pipes apply downward pressure to the tilted end of the connecting pipe through the upper pressure plate 41, thereby maintaining the overall stability of the connecting pipe and thus providing stable support to the side wall of the pit 1.

[0055] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A foundation pit support structure, comprising a plurality of adjacent and connected Larssen sheet piles (2), wherein the Larssen sheet piles (2) abut against the inner wall of the foundation pit (1), characterized in that, The foundation pit (1) is provided with a support mechanism (3). The support mechanism (3) includes a support plate (31) that abuts against the inner side wall of the Larssen sheet pile (2). A top plate (32) abuts against the connection of adjacent Larssen sheet piles (2). The support mechanism (3) also includes a support seat (33) set in the foundation pit (1). A top support assembly (34) is provided on the support seat (33). The support plate (31) pushes the top plate (32) against the Larssen sheet pile (2) through the top support assembly (34). The top support assembly (34) includes a support rod (342), one end of which is hinged to the support plate (31), and the other end is rotatably and slidably connected to a slider (341). The slider (341) is slidably connected inside the support base (33), and the sliding direction is horizontally toward the Larssen sheet pile (2). The middle section of the support rod (342) is rotatably connected to the support base (33). The slider (341) is provided with a driving component that drives the top plate (32) to press against the Larssen sheet pile (2). The driving component includes a driving rod (343) connected to the top plate (32). One end of the driving rod (343) away from the top plate (32) passes through and is slidably connected to the support base (33). The end of the driving rod (343) located inside the support base (33) abuts against the side wall of the slider (341). The contact surface between the driving rod (343) and the slider (341) is set as an inclined surface. When the slider (341) approaches the support plate (31), the slider (341) pushes the top plate (32) against the Larssen sheet pile (2) through the driving rod (343).

2. The foundation pit support structure according to claim 1, characterized in that, The support base (33) is provided with a support spring (345), and the two ends of the support spring (345) are respectively connected to two drive rods (343).

3. The foundation pit support structure according to claim 1, characterized in that, The drive rod (343) is inclined, and the end of the drive rod (343) near the top plate (32) gradually tilts upward.

4. The foundation pit support structure according to claim 1, characterized in that, The slider (341) is provided with connecting rods (35) on both sides. The end of the connecting rod (35) away from the support seat (33) is provided with a pressure block (36). The pressure block (36) abuts against the outer wall of the Larssen sheet pile (2). A connecting component (37) is provided between the pressure blocks (36) on the same Larssen sheet pile (2).

5. The foundation pit support structure according to claim 4, characterized in that, The connecting component (37) includes a positioning rod (371) disposed on the pressure block (36). A limiting block (372) is provided at one end of the positioning rod (371) away from the pressure block (36). The pressure block (36) is provided with a positioning groove (361) corresponding to the positioning rod (371). The positioning rod (371) is inserted into the positioning groove (361). The pressure block (36) is also provided with a limiting groove (362) communicating with the positioning groove (361). The limiting block (372) is engaged in the limiting groove (362) and slides along the limiting groove (362).

6. The foundation pit support structure according to claim 2, characterized in that, The support base (33) is also provided with a buffer spring (346), which is connected between the support base (33) and the slider (341).

7. The foundation pit support structure according to claim 1, characterized in that, The top plate (32) is provided with a water-absorbing layer (321) on the side near the connection of the adjacent Larssen sheet pile (2), and a water-sealing strip (322) is provided on both sides of the water-absorbing layer (321). The water-sealing strip (322) and the water-absorbing layer (321) are both pressed against the Larssen sheet pile (2).

8. The foundation pit support structure according to claim 1, characterized in that, A connecting pipe is provided between the two opposing support seats (33), and a limiting component (4) is provided at both ends of the connecting pipe. The limiting component (4) includes an upper pressure plate (41) and a lower pressure plate (42) that respectively clamp the upper and lower sides of the connecting pipe. A U-shaped nail (43) is provided between the upper pressure plate (41) and the lower pressure plate (42) to connect the two. A support column (46) is provided below the lower pressure plate (42). An upper pressure rod (48) is hinged between the two upper pressure plates (41), and a lower pressure rod (49) is hinged between the two lower pressure plates (42). A fixed column (47) is also provided inside the pit (1) and is hinged to both the upper pressure rod (48) and the lower pressure rod (49).

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