Foundation pit supporting structure of building

Abstract

The invention relates to the technical field of foundation pit protection, in particular to a building foundation pit supporting structure which comprises a plurality of supporting baffles and a plurality of supporting columns. The supporting baffles are attached to a soil body around a foundation pit, the supporting baffles are sequentially connected, each supporting baffle comprises a fixing part and deformation parts located on the two sides of the fixing part, the deformation parts are bent towards one side of the soil body, an inserting groove is formed in the deformation part on one side, and an inserting block is arranged on the deformation part on the other side. The inserting blocks on the adjacent supporting baffles are inserted into the inserting grooves of the adjacent supporting baffles. The multiple supporting columns are installed among the multiple supporting baffles. The supporting baffles are supported through the supporting columns, mounting of the supporting structure is completed, the deformation parts at the two ends of the fixing part are opened towards the two sides when being extruded, so that the inserting blocks abut against the elastic sealing pieces more tightly, and sealing between the adjacent supporting baffles is better. The structure has the effects that leakage of fine particles in the enclosure is reduced, and the stability of the foundation pit is improved.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit protection, and in particular to a building foundation pit support structure. Background Art

[0002] Building foundation pit support structures refer to a series of reinforcement and support measures taken around the foundation pit to ensure the stability and safety of the foundation pit during the construction of the building. These structures can prevent the collapse of the foundation pit wall, ensure the safety of construction workers, and protect surrounding buildings and underground facilities from damage.

[0003] Common supporting structures include cement retaining wall structures, pile and slab wall structures, slope stabilization structures and reverse arch wall structures. In pile and slab wall structures, channel steel piles are often used for support. Simple retaining walls are formed by overlapping or arranging channel steels in reverse or side by side, making the supporting structure not only easy to construct but also capable of secondary use.

[0004] At present, when installing channel steel sheet piles, a pile driver is usually used to drive the channel steel piles vertically into the ground to form a retaining structure, and then the joints of adjacent channel steel piles are welded or locked with bolts. However, when the channel steel piles are subjected to pit soil pressure and water pressure, they are squeezed and deformed, which makes it easy for fine cracks to form at the joints of the channel steel piles, causing fine particles in the retaining to easily leak out from the fine cracks. The loss of fine particles may reduce the stability of the soil around the foundation pit and increase the risk of foundation pit collapse. Summary of the invention

[0005] In order to reduce the leakage of fine particles in the enclosure and improve the stability of the foundation pit, the present application provides a building foundation pit support structure.

[0006] The present application provides a building foundation pit support structure adopting the following technical solution: A building foundation pit support structure, comprising: A plurality of support baffles are fitted on the soil around the foundation pit, the support baffles are connected in sequence, the support baffles include a fixed part and a deformation part located on both sides of the fixed part, the deformation part is bent toward one side of the soil, a slot is provided on one side of the deformation part, and an insert block is provided on the other side of the deformation part, the insert block on the adjacent support baffle is inserted into the slot of the adjacent support baffle, an elastic seal is provided in the slot, and the elastic seal is pressed against the insert block; A plurality of support columns are installed between the plurality of support baffles, wherein the support columns include a telescopic portion and abutment portions fixedly connected to both ends of the telescopic portion, wherein the abutment portions abut against the fixed portion, and the telescopic portion is used to adjust the distance between the abutment portions at both ends.

[0007] By adopting the above technical scheme, the supporting baffles are sequentially arranged on the soil around the foundation pit, and the plug blocks on the adjacent supporting baffles are inserted into the slots. At this time, the elastic sealing member abuts against the plug blocks, thereby sealing the gaps on the adjacent supporting baffles. Then, the abutting part of the supporting column is used to abut the fixed part on the supporting baffle, and then the telescopic part is started to extend, so as to complete the reinforcement of the supporting baffle by abutting the supporting baffles at both ends of the supporting column.

[0008] When the supporting baffle is subjected to the pit soil pressure and water pressure, the pit soil and water will squeeze the deformed part, causing the deformed parts at both ends of the fixed part to open toward both sides, and the opened deformed part makes the adjacent plug blocks and elastic seals abut more tightly, thereby avoiding the possibility of gaps between adjacent supporting baffles caused by the deformation of the supporting baffle when the supporting baffle is subjected to the pit soil pressure and water pressure, thereby reducing the leakage of fine particles in the enclosure and improving the stability of the foundation pit.

[0009] Optionally, the elastic sealing member includes a sealing block and a sealing spring, the sealing block is slidably connected in the slot, and the sealing spring is located between the sealing block and the bottom of the slot to drive the sealing block away from the bottom of the slot.

[0010] By adopting the above technical solution, when the plug block is inserted into the slot, the sealing spring drives the sealing block to abut against the plug block, thereby sealing the sealing block and the plug block, reducing the outflow of water and fine sand from the gap between the sealing block and the plug block.

[0011] At the same time, when the supporting baffle is subjected to pit soil pressure and water pressure, the pit soil pressure and water pressure will squeeze the deformation part, so that the deformation part on the same fixed part will open toward both sides, and the sealing spring will drive the adjacent plug blocks and slots away from each other, that is, the adjacent deformation parts will move away from each other, and then the deformation parts on the same fixed part will approach each other, thereby sharing the pit soil pressure and water pressure on the supporting baffle, thereby improving the ability of the supporting baffle to withstand the pit soil pressure and water pressure.

[0012] Optionally, a display block is provided on a side of the sealing block away from the soil body, and an end of the display block away from the soil body passes through the deformation portion.

[0013] By adopting the above technical solution, the position of the display block shows the compression amount of the sealing spring, so that it is easy to observe the condition of the supporting baffle under the pit soil pressure and water pressure.

[0014] Optionally, an elastic contraction member is provided between the deformation portions located on both sides of the same fixing portion, and the elastic contraction member is used to drive the two deformation portions to approach each other.

[0015] By adopting the above technical solution, the setting of the elastic contraction part drives the deformation parts on both sides of the same fixed part to approach each other, thereby alleviating the soil pressure and water pressure borne by the supporting baffle, thereby improving the supporting baffle's ability to withstand the soil pressure and water pressure.

[0016] Optionally, the elastic shrinkage component includes an elastic plate and an elastic component, both ends of the elastic plate are respectively fixedly connected to the deformation part, and the elastic plate protrudes toward one side of the soil body. The elastic component is located between the elastic plate and the deformation part, and the elastic component is used to increase the protrusion degree of the elastic plate.

[0017] By adopting the above technical solution, the tension of the elastic plate on the two ends of the deformation part is utilized, and the convexity of the elastic plate is increased by utilizing the elastic member, thereby further increasing the tension of the elastic plate and improving the pressure bearing capacity of the deformation part.

[0018] At the same time, the elastic plate protects the elastic member located between the elastic plate and the deformation portion, thereby preventing the elastic member from being squeezed by the soil and causing failure of the elastic member.

[0019] Optionally, filtering holes are provided on the elastic plate.

[0020] By adopting the above technical solution, the filter holes are arranged to discharge the stagnant water in the soil, thereby reducing the water pressure.

[0021] Optionally, a water outlet pipe is provided at the bottom of the fixing portion, a drainage pipe is connected to the water outlet pipe, one end of the water outlet pipe is connected to a side of the fixing portion facing the soil, and the other end is connected to the drainage.

[0022] By adopting the above technical solution, the stagnant water filtered by the elastic plate in the supporting baffle is discharged by utilizing the cooperation of the water outlet pipe and the drainage pipe, thereby avoiding the accumulation of stagnant water in the supporting baffle.

[0023] Optionally, the elastic plate is arranged in an arc shape, the elastic member is a tension spring, and two ends of the tension spring are respectively connected to the connection between the two ends of the elastic plate and the deformation part.

[0024] By adopting the above technical solution, tension springs are used to connect the connection points between the two ends of the elastic plate and the deformation part, so as to maximize the tension of the tension spring on the deformation part and the elastic plate, so that the deformation part and the elastic plate can withstand the pit soil pressure and water pressure to the maximum extent.

[0025] Optionally, the elastic plate is bent in three sections, the elastic member is a compression spring, one end of the compression spring is connected to a bent portion in the middle of the elastic plate, and the other end is connected to the fixing portion.

[0026] By adopting the above technical solution, the three-section bent elastic plate facilitates the connection of the compression spring. The compression spring abuts against the elastic plate to drive the elastic plate away from the fixed part, so that the elastic plate pulls the deformation parts on both sides, thereby driving the deformation parts on both sides of the same fixed part closer to each other.

[0027] Optionally, the telescopic portion includes a threaded rod and a threaded barrel, the two ends of the threaded rod are respectively provided with threads of opposite rotation directions, the threads of opposite rotation directions at the two ends are respectively connected to the threaded barrel, and the abutment portion is fixedly connected to the end of the threaded barrel away from the threaded rod. A rotating seat is fixedly connected to the middle part of the threaded rod, and a rotating rod is rotatably connected to the rotating seat, and the axis of rotation of the rotating rod around the rotating seat is perpendicular to the axis of the threaded rod; and / or A limiting groove is provided on the abutting portion, the fixing portion abuts against the bottom of the limiting groove, and the side wall of the limiting groove is attached to the deformation portion.

[0028] By adopting the above technical solution, the rotating seat is rotated by the rotating rod to drive the threaded rod to rotate, thereby controlling the total length of the threaded rod and the threaded tube, so that the telescopic part can be telescoped. After the adjustment of the telescopic part is completed, the rotating rod is rotated so that the rotating rod is parallel to the threaded rod, thereby storing the rotating rod.

[0029] The bottom of the limiting groove abuts against the fixing part to reduce the possibility of the fixing part detaching from the soil, while the side wall of the limiting groove abuts against the deformation part to avoid the possibility of the abutting part detaching from the fixing part, making the abutment of the abutting part more stable.

[0030] In summary, the present application includes at least one of the following beneficial technical effects: 1. By using the cooperation of multiple supporting baffles, fixed parts, deformed parts, slots, plugs, elastic seals, support columns, telescopic parts and abutting parts, when the supporting baffles are subjected to pit soil pressure and water pressure, the pit soil and water will squeeze the deformed parts, so that the deformed parts at both ends of the fixed parts are opened toward both sides, and the opened deformed parts make the adjacent plugs and elastic seals abut more closely, thereby avoiding the possibility of gaps between adjacent supporting baffles caused by the deformation of the supporting baffles when the supporting baffles are subjected to pit soil pressure and water pressure, thereby reducing the leakage of fine particles in the enclosure and improving the stability of the foundation pit; 2. Through the cooperation of the deformation part, the slot, the plug-in block, the sealing block and the sealing spring, when the plug-in block is inserted into the slot, the sealing spring drives the sealing block to abut against the plug-in block, so that the sealing block and the plug-in block are sealed, and the water and fine sand flow out from the gap between the sealing block and the plug-in block is reduced. At the same time, when the support baffle is subjected to the pit soil pressure and water pressure, the pit soil pressure and water pressure will squeeze the deformation part, so that the deformation part on the same fixed part will open toward both sides, and the sealing spring will drive the adjacent plug-in blocks and slots away from each other, that is, the adjacent deformation parts will move away from each other, and then the deformation parts on the same fixed part will approach each other, and then the support baffle will share the pit soil pressure and water pressure, thereby improving the ability of the support baffle to withstand the pit soil pressure and water pressure; 3. Through the coordination of the fixed part, the deformation part, the elastic plate and the elastic member, the elastic plate is used to exert tension on both ends of the deformation part, and the elastic member is used to increase the protrusion of the elastic plate, thereby further increasing the tension of the elastic plate and the pressure-bearing capacity of the deformation part. At the same time, the elastic plate protects the elastic member between the elastic plate and the deformation part, thereby avoiding squeezing of the elastic member by the soil and causing failure of the elastic member. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a building foundation pit support structure in Example 1 of the present application.

[0032] Figure 2 It is a structural schematic diagram of the support baffle in Example 1 of the present application.

[0033] Figure 3 It is a schematic diagram of the structure of the support column in Example 1 of the present application.

[0034] Figure 4 It is a structural schematic diagram of the support baffle in Example 2 of the present application.

[0035] Description of reference numerals: 1. Support baffle; 11. Fixed part; 12. Deformation part; 13. Slot; 14. Insert block; 15. Elastic sealing part; 151. Sealing block; 152. Sealing spring; 2. Support column; 21. Telescopic part; 211. Threaded rod; 212. Threaded cylinder; 22. Abutment part; 221. Limiting groove; 3. Rotating seat; 31. Rotating rod; 4. Display block; 5. Elastic contraction part; 51. Elastic plate; 52. Elastic part; 521. Tension spring; 522. Compression spring; 53. Filter hole; 6. Water outlet pipe; 7. Drain pipe. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The embodiment of the present application discloses a building foundation pit support structure.

[0038] Example 1 Reference Figure 1 and Figure 2 A building foundation pit support structure includes a plurality of support baffles 1 and a plurality of support columns 2. The plurality of support baffles 1 are attached to the soil around the foundation pit, and the support baffles 1 are connected in sequence. The support baffles 1 include a fixed portion 11 and a deformable portion 12 located on both sides of the fixed portion 11. The deformable portion 12 is bent toward one side of the soil. A slot 13 is provided on the deformable portion 12 on one side, and an insert block 14 is provided on the deformable portion 12 on the other side. The insert blocks 14 on adjacent support baffles 1 are inserted into the slots 13 of adjacent support baffles 1. An elastic seal 15 is provided in the slot 13, and the elastic seal 15 is tightly pressed against the insert block 14. A plurality of support columns 2 are installed between the plurality of support baffles 1. The support columns 2 include a telescopic portion 21 and an abutting portion 22 fixedly connected to both ends of the telescopic portion 21. The abutting portion 22 abuts against the fixed portion 11. The telescopic portion 21 is used to adjust the distance between the abutting portions 22 located at both ends. The support baffles 1 are supported by the support columns 2 to complete the installation of the support structure. The deformation parts 12 at both ends of the fixing part 11 are squeezed to open toward both sides, so that the plug block 14 is more tightly pressed against the elastic seal 15, so that the seal between adjacent support baffles 1 is better, thereby reducing the leakage of fine particles in the enclosure and improving the stability of the foundation pit.

[0039] The elastic seal 15 includes a sealing block 151 and a sealing spring 152. The sealing block 151 is in the shape of an elongated strip, and the length of the sealing block 151 is consistent with the length of the deformation portion 12. The sealing block 151 is slidably connected in the slot 13. The sealing spring 152 is located between the sealing block 151 and the bottom of the slot 13. A plurality of sealing springs 152 are arranged along the length direction of the sealing block 151. The plurality of sealing springs 152 are used to drive the sealing block 151 away from the bottom of the slot 13, so that the sealing block 151 can fit higher with the plug 14.

[0040] When the insert block 14 is inserted into the slot 13 , the sealing spring 152 drives the sealing block 151 to abut against the insert block 14 , thereby sealing the sealing block 151 and the insert block 14 , reducing the outflow of water and fine sand from the gap between the sealing block 151 and the insert block 14 .

[0041] At the same time, when the supporting baffle 1 is subjected to the pit soil pressure and water pressure, the pit soil pressure and water pressure will squeeze the deformation part 12, so that the deformation part 12 on the same fixed part 11 will open toward both sides, and the sealing spring 152 will drive the adjacent plug blocks 14 and slots 13 away from each other, that is, the adjacent deformation parts 12 will move away from each other, and then the deformation parts 12 on the same fixed part 11 will approach each other, thereby sharing the pit soil pressure and water pressure of the supporting baffle 1, thereby improving the ability of the supporting baffle 1 to withstand the pit soil pressure and water pressure.

[0042] In an optional embodiment, a display block 4 is provided on the side of the sealing block 151 away from the soil, and the end of the display block away from the soil passes through the deformation part 12. The position of the display block 4 displays the compression amount of the sealing spring 152, so as to facilitate observation of the support baffle 1 under the pit soil pressure and water pressure, and facilitate operators to adjust the support structure according to the position of the display block 4.

[0043] An elastic contraction member 5 is provided between the deformation portions 12 on both sides of the same fixed portion 11, and the elastic contraction member 5 is used to drive the two deformation portions 12 to approach each other. The elastic contraction member 5 is used to drive the deformation portions 12 on both sides of the same fixed portion 11 to approach each other, thereby relieving the pit soil pressure and water pressure of the support baffle 1, thereby improving the support baffle 1 to withstand the pit soil pressure and water pressure.

[0044] The elastic shrinkage member 5 includes an elastic plate 51 and an elastic member 52. Both ends of the elastic plate 51 are fixedly connected to the deformation part 12, and the elastic plate 51 protrudes toward one side of the soil body. The protruding elastic plate 51 is also convenient for withstanding the pit soil pressure and water pressure. When the elastic plate 51 is not subjected to the pit soil pressure and water pressure, the elastic plate 51 exerts a pulling force on both ends of the deformation part 12. At this time, the pulling force of the elastic plate 51 on both ends of the deformation part 12 improves the pressure-bearing capacity of the deformation part 12.

[0045] The elastic plate 51 is provided with filter holes 53, and the stagnant water in the soil is discharged through the filter holes 53, thereby reducing the water pressure.

[0046] The elastic plate 51 in this embodiment is arranged in an arc shape, and the elastic member 52 is located between the elastic plate 51 and the deformation portion 12. The elastic plate 51 is used to protect the elastic member 52 located between the elastic plate 51 and the deformation portion 12, thereby preventing the elastic member 52 from being squeezed by the soil and causing failure of the elastic member 52. The elastic member 52 is a tension spring 521, and the two ends of the tension spring 521 are respectively connected to the connection between the two ends of the elastic plate 51 and the deformation portion 12.

[0047] The tension spring 521 is used to connect the connection points between the two ends of the elastic plate 51 and the deformation part 12, so as to maximize the tension of the tension spring 521 on the deformation part 12 and the elastic plate 51, so that the deformation part 12 and the elastic plate 51 can withstand the pit soil pressure and water pressure to the maximum extent.

[0048] The bottom of the fixed part 11 is provided with a water outlet pipe 6, to which a drainage pipe 7 is connected, one end of the water outlet pipe 6 is connected to the side of the fixed part facing the soil, and the other end is connected to the drainage. The cooperation of the water outlet pipes 6 and the drainage pipes 7 on the multiple supporting baffles 1 is used to discharge the stagnant water filtered by the elastic plate 51 in the supporting baffle 1, thereby avoiding the accumulation of stagnant water in the supporting baffle 1.

[0049] Reference Figure 2 and Figure 3The telescopic portion 21 in this embodiment includes a threaded rod 211 and a threaded barrel 212. The two ends of the threaded rod 211 are respectively provided with threads with opposite rotation directions, and the threads with opposite rotation directions at the two ends are respectively connected to the threaded barrel 212. The abutment portion 22 is fixedly connected to one end of the threaded barrel 212 away from the threaded rod 211. The threads with opposite rotation directions at the two ends of the threaded rod 211 rotate with the threaded barrel 212, and the threaded barrels 212 on both sides are driven to move closer to or away from each other, so as to facilitate the adjustment of the length of the telescopic portion 21.

[0050] In order to facilitate driving the threaded rod 211 to rotate, a rotating seat 3 is fixedly connected to the middle of the threaded rod 211 , and a rotating rod 31 is rotatably connected to the rotating seat 3 , and the axis of rotation of the rotating rod 31 around the rotating seat 3 is perpendicular to the axis of the threaded rod 211 .

[0051] When the rotating rod 31 is needed to drive the threaded rod 211 to rotate, the rotating rod 31 is rotated to make the axis of the rotating rod 31 perpendicular to the axis of the threaded rod 211, and then the rotating rod 31 is moved to make the threaded rod 211 rotate, and the rotating rod 31 is convenient for driving the threaded rod 211 to rotate. After use, the rotating rod 31 is rotated again to make the axis of the rotating rod 31 parallel to the axis of the threaded rod 211, and the rotating rod 31 is convenient for storage.

[0052] In order to prevent the abutting portion 22 from rotating with the threaded rod 211, a limiting groove 221 is provided on the abutting portion 22 in this embodiment, the fixing portion 11 abuts against the bottom of the limiting groove 221, and the side wall of the limiting groove 221 fits on the deformable portion 12. By limiting the limiting groove 221, when the threaded rod 211 rotates, the threaded barrel 212 is limited by the limiting groove 221 on the abutting portion 22 and fixed, so that the threaded rod 211 can better adjust the length of the telescopic portion 21.

[0053] At the same time, the bottom of the limiting groove 221 abuts against the fixing part 11 to reduce the possibility of the fixing part 11 being separated from the soil, and the side wall of the limiting groove 221 abuts against the deformable part 12 to avoid the possibility of the abutting part 22 being separated from the fixing part 11, making the abutment of the abutting part 22 more stable.

[0054] The implementation principle of a building foundation pit support structure in an embodiment of the present application is: the supporting baffles 1 are sequentially arranged on the soil around the foundation pit, and the plug blocks 14 on adjacent supporting baffles 1 are inserted into the slots 13. At this time, the elastic sealing member 15 abuts against the plug blocks 14, thereby sealing the gaps on the adjacent supporting baffles 1.

[0055] Then, the abutting portion 22 of the support column 2 is placed on the support baffle 1 so that the fixing portion 11 is located in the limiting groove 221 , and then the threaded rod 211 is rotated to drive the telescopic portion 21 to extend, so that the support column 2 supports the support baffle 1 .

[0056] When the supporting baffle 1 is subjected to pit soil pressure and water pressure, the pit soil and water will squeeze the deformed portion 12, causing the deformed portions 12 at both ends of the fixed portion 11 to open toward both sides, and the opened deformed portions 12 make the adjacent plug blocks 14 and elastic seals 15 abut more tightly, thereby avoiding the possibility of gaps between adjacent supporting baffles 1 caused by the deformation of the supporting baffle 1 when the supporting baffle 1 is subjected to pit soil pressure and water pressure, thereby reducing the leakage of fine particles in the enclosure and improving the stability of the foundation pit.

[0057] Example 2 Reference Figure 4 The difference between Example 2 and Example 1 is that the elastic plate 51 is bent into three sections, the elastic member 52 is a compression spring 522, one end of the compression spring 522 is connected to a bent portion in the middle of the elastic plate 51, and the other end is connected to the fixed portion. A plurality of compression springs 522 are arranged along the length direction of the supporting baffle 1, and the elastic plate 51 is driven away from the fixed portion by abutting against the multiple compression springs 522.

[0058] The elastic plate 51 with three bent sections facilitates the connection of the compression spring 522. The compression spring 522 abuts against the elastic plate 51 to drive the elastic plate 51 away from the fixed portion, so that the elastic plate 51 pulls the deformation portions 12 on both sides, thereby driving the deformation portions 12 on both sides of the same fixed portion 11 closer to each other.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A building foundation pit support structure, characterized in that: include: A plurality of support baffles (1) are attached to the soil around the foundation pit, the support baffles (1) are connected in sequence, the support baffles (1) include a fixed portion (11) and a deformable portion (12) located on both sides of the fixed portion (11), the deformable portion (12) is bent toward one side of the soil, a slot (13) is provided on one side of the deformable portion (12), and an insert block (14) is provided on the other side of the deformable portion (12), the insert block (14) on the adjacent support baffle (1) is inserted into the slot (13) of the adjacent support baffle (1), an elastic sealing member (15) is provided in the slot (13), and the elastic sealing member (15) is pressed against the insert block (14); A plurality of support columns (2) are installed between the plurality of support baffles (1), the support columns (2) comprising a telescopic portion (21) and abutment portions (22) fixedly connected to both ends of the telescopic portion (21), the abutment portions (22) abutting against the fixed portion (11), and the telescopic portion (21) is used to adjust the distance between the abutment portions (22) located at both ends.

2. The building foundation pit support structure according to claim 1, characterized in that: The elastic sealing member (15) comprises a sealing block (151) and a sealing spring (152); the sealing block (151) is slidably connected in the slot (13); and the sealing spring (152) is located between the sealing block (151) and the bottom of the slot (13) to drive the sealing block (151) away from the bottom of the slot (13).

3. The building foundation pit support structure according to claim 2, characterized in that: A display block (4) is provided on a side of the sealing block (151) away from the soil body, and an end of the display block (4) away from the soil body passes through the deformation portion (12).

4. The building foundation pit support structure according to claim 1, characterized in that: An elastic contraction member (5) is provided between the deformation portions (12) located on both sides of the same fixed portion (11), and the elastic contraction member (5) is used to drive the two deformation portions (12) to move closer to each other.

5. The building foundation pit support structure according to claim 4, characterized in that: The elastic contraction member (5) includes an elastic plate (51) and an elastic member (52); both ends of the elastic plate (51) are respectively fixedly connected to the deformation portion (12); the elastic plate (51) protrudes toward one side of the soil; the elastic member (52) is located between the elastic plate (51) and the deformation portion (12); and the elastic member (52) is used to increase the protrusion of the elastic plate (51).

6. The building foundation pit support structure according to claim 5, characterized in that: The elastic plate (51) is provided with a filtering hole (53).

7. The building foundation pit support structure according to claim 6, characterized in that: A water outlet pipe (6) is provided at the bottom of the fixing portion (11), and a drainage pipe (7) is connected to the water outlet pipe (6). One end of the water outlet pipe (6) is connected to a side of the fixing portion (11) facing the soil, and the other end is connected to the drainage pipe (7).

8. The building foundation pit support structure according to claim 5, characterized in that: The elastic plate (51) is arranged in an arc shape, the elastic member (52) is a tension spring (521), and two ends of the tension spring (521) are respectively connected to the connection points between the two ends of the elastic plate (51) and the deformation portion (12).

9. The building foundation pit support structure according to claim 5, characterized in that: The elastic plate (51) is bent in three sections, the elastic member (52) is a compression spring (522), one end of the compression spring (522) is connected to a bent portion in the middle of the elastic plate (51), and the other end is connected to the fixing portion (11).

10. The building foundation pit support structure according to any one of claims 1 to 9, characterized in that: The telescopic portion (21) comprises a threaded rod (211) and a threaded barrel (212); threads of opposite rotation directions are respectively provided at both ends of the threaded rod (211); the threads of opposite rotation directions at both ends are respectively connected to the threaded barrel (212); the abutment portion (22) is fixedly connected to an end of the threaded barrel (212) away from the threaded rod (211); a rotating seat (3) is fixedly connected to the middle of the threaded rod (211); a rotating rod (31) is rotatably connected to the rotating seat (3); and an axis of rotation of the rotating rod (31) around the rotating seat (3) is perpendicular to the axis of the threaded rod (211); and / or A limiting groove (221) is provided on the abutting portion (22), the fixing portion (11) abuts against the bottom of the limiting groove (221), and the side wall of the limiting groove (221) is attached to the deformation portion (12).

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