A pressure-proof foundation pit support structure

Abstract

The present invention discloses a pressure-proof foundation pit support structure, including a support assembly, including a support plate, a baffle, a water seepage piece, a water level sensor, an extrusion piece, and a sealing piece. The baffle is fixed in the support plate, and its interior is divided into an upper first chamber and a lower second chamber. The water seepage piece is located in the second chamber, the water level sensor is fixed to the inner wall of the second chamber, the extrusion piece is arranged at the bottom of one side of the water seepage piece, and the sealing piece slides on the water seepage piece; and a support assembly is arranged between the two support plates, including a support pipe, a receiving piece, a flow guide piece, a mounting piece, and a connecting piece. The present invention makes the support structure more stable when in use through the arrangement of the support assembly and the support assembly, and can automatically adjust the compaction of the support according to the amount of water seepage from the inner wall of the foundation pit, greatly improving the convenience and efficiency of construction.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support, in particular to a pressure-proof foundation pit support structure. Background Art

[0002] Foundation pit support is a measure of support, reinforcement and protection for the side walls of the foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. The foundation pit support project is a temporary project, and the designed safety reserve can be relatively small, but it is also related to regionality. The geological conditions in different regions have different characteristics. The foundation pit support project is an interdisciplinary subject of geotechnical engineering, structural engineering and construction technology. It is a systematic project with the interaction of multiple complex factors. It is a comprehensive technical discipline that has yet to be developed in theory. The basement foundation pit support in existing technology is generally fixed directly, but the soil on the side of the foundation pit will infiltrate more water during the long-term squeezing process of the support. At this time, the soil on the side walls of the foundation pit will shrink inward, causing the support to loosen. At the same time, the downward flow of these seeped water will have a certain impact on the bottom of the foundation pit, causing the soil to loosen, which will have a certain impact on subsequent construction. Summary of the Invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0004] In view of the above problems and / or the problems existing in the existing basement foundation pit supporting structure, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is that the basement foundation pit support in the existing technology is generally directly fixed, but a lot of water will penetrate into the soil on the side of the foundation pit during the long-term squeezing process of the support. At this time, the soil on the side wall of the foundation pit will shrink inward, causing the support to loosen. At the same time, the downward flow of these seeped water will have a certain impact on the bottom of the foundation pit, causing the soil to loosen, which will have a certain impact on subsequent construction.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a pressure-proof foundation pit support structure, which includes a support assembly, including a support plate, a baffle, a seepage member, a water level sensor, an extrusion member and a sealing member, the baffle being fixed in the support plate and dividing its interior into an upper first chamber and a lower second chamber, the seepage member being located in the second chamber, the water level sensor being fixed to the inner wall of the second chamber, the extrusion member being arranged at the bottom of one side of the seepage member, and the sealing member sliding on the seepage member; and a support assembly being arranged between the two support plates, including a support pipe, a socket, a guide member, a mounting member and a connecting member, the support pipe being located between the two support plates, the socket being fixed on the support plate and located on both sides of the support pipe, the guide member being arranged in the support pipe, the mounting member being arranged in the guide member, and the connecting member being arranged on the top of the mounting member.

[0007] As a preferred solution of the basement foundation pit support structure described in the present invention, the water seepage component includes a first plate, a second plate and a wire mesh, the first plate is fixed to the bottom of the baffle, the second plate is fixed to the bottom wall of the second chamber, the wire mesh is fixed to one side of the support plate, a water seepage hole is opened on the outside of the support plate, and the wire mesh is located outside the water seepage hole.

[0008] As a preferred solution of the basement foundation pit support structure described in the present invention, the extruded part includes a hydraulic telescopic rod, a movable plate and a lifting plate, the hydraulic telescopic rod is fixed to the bottom wall of the second chamber, the movable plate is fixed to the top of the hydraulic telescopic rod and contacts the second plate, and the lifting plate is fixed to one side of the top of the movable plate.

[0009] As a preferred solution of the basement foundation pit support structure described in the present invention, the sealing member includes a first sealing plate, a push plate and a second sealing plate. The first sealing plate slides on the top of one side of the second plate, and a movable groove is opened at the bottom thereof. The push plate slides in the movable groove, and the bottom contacts the lifting plate. The second sealing plate is fixed to the bottom of one side of the push plate, and a drainage hole is opened on one side of the support plate. The second sealing plate is located inside the drainage hole.

[0010] As a preferred solution of the basement foundation pit supporting structure of the present invention, the blocking member further includes a first spring, two ends of which are respectively fixed to the inner wall of the movable groove and the top of the push plate.

[0011] As a preferred solution of the basement foundation pit support structure described in the present invention, the receiving part includes a receiving plate and a receiving rod, the receiving plate is fixed on the support plate and is located on both sides of the support tube, the receiving rod is fixed on both sides of the support tube, an inclined groove is opened in the receiving plate, and the receiving rod slides in the inclined groove.

[0012] As a preferred solution of the basement foundation pit support structure described in the present invention, the guide member includes a fixed ring and an inclined plate, the fixed ring is fixed on both sides of the inner wall of the support tube, and the inclined plate is fixed on the inner side of the fixed ring.

[0013] As a preferred solution of the basement foundation pit support structure described in the present invention, the mounting part includes a water baffle, a movable plate and a threaded rod, the water baffle is fixed in the fixed ring, a groove is provided on the top of the water baffle, the movable plate slides in the groove, the threaded rod is rotatably connected to the bottom of the movable plate, is threadedly connected to the water baffle, and the bottom end extends to the bottom of the support tube.

[0014] As a preferred solution of the basement foundation pit support structure described in the present invention, the connecting part includes a connecting pipe, a movable door and a block, one end of the connecting pipe is fixed to the outside of the drainage hole, and the other end is located on the top of the movable plate, the movable door is rotatably connected to the connecting pipe, and the block is fixed to the inner wall of the connecting pipe and is in contact with the movable door.

[0015] As a preferred solution of the basement foundation pit support structure described in the present invention, the connecting member further includes a fixed block and a second spring, the fixed block is fixed to the end of the connecting pipe, and the two ends of the second spring are respectively fixed to the movable door and the fixed block.

[0016] The beneficial effects of the present invention are as follows: the present invention makes the support structure more stable during use through the arrangement of the support assembly and the support assembly, and can automatically adjust the support compression according to the amount of water seepage on the inner wall of the foundation pit, thereby greatly improving the convenience and efficiency of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0018] Figure 1 This is the overall structural diagram of the basement foundation pit support structure.

[0019] Figure 2This is the overall cross-section of the basement foundation pit support structure.

[0020] Figure 3 This is the internal structure diagram of the second chamber of the basement foundation pit support structure.

[0021] Figure 4 Another perspective view of the sealing parts of the basement foundation pit support structure.

[0022] Figure 5 This is a side sectional view of the second chamber of the basement foundation pit support structure.

[0023] Figure 6 Another perspective view of the support components of the basement foundation pit support structure.

[0024] Figure 7 This is the structural diagram of the installation and connection parts of the basement foundation pit support structure. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0028] Example 1

[0029] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides a pressure-proof foundation pit support structure. The basement foundation pit support structure includes a support component 100 and a support component 200. A plurality of support components 100 are provided, evenly distributed on the side walls of the foundation pit, and then the support components 200 are used to support the symmetrical support components 100 to improve their stability.

[0030] Specifically, the support assembly 100 includes a support plate 101, a baffle 102, a water seepage part 103, a water level sensor 104, an extrusion part 105 and a sealing part 106. The baffle 102 is fixed in the support plate 101 and its interior is divided into an upper first chamber S1 and a lower second chamber S2. The water seepage part 103 is located in the second chamber S2, the water level sensor 104 is fixed to the inner wall of the second chamber S2, the extrusion part 105 is arranged at the bottom of one side of the water seepage part 103, and the sealing part 106 slides on the water seepage part 103.

[0031] The support plate 101 is rectangular, and a cover is fixed to its top by bolts. A water inlet hole is provided on the cover. After installation is completed, the staff can inject some water into the first chamber S1 through the hole to increase the mass of the support plate 101 and make it more stable during installation. The baffle 102 is used to separate the first chamber S1 and the second chamber S2. When the support is in use, water in the soil on the side wall of the foundation pit seeps into the water-permeable part 103 to prevent water from seeping into the bottom of the foundation pit. At the same time, the weight of the support plate 101 is increased by the water, making it more stable during installation. When the water level in the second chamber S2 reaches the water level sensor 104, the water inside it is squeezed out by the extrusion part 105, and then the water outlet position on the water-permeable part 103 is blocked by the blocking part 106 to prevent water from returning and affecting use.

[0032] An X-shaped reinforcement plate is fixed in the first chamber S1 to improve the stability of the device. Evenly distributed reinforcement plates are fixed on one side of the support plate 101 to further improve the strength of the device. Connecting buckles are fixed on both sides of the support plate 101, and the two sets of connecting buckles correspond to each other. One has a chamber inside, and the other is I-shaped and can be inserted into the chamber. A through hole is provided in the middle, and the staff can pre-embed steel pipes in the side wall of the foundation pit, which are located in the through hole to fix the support plate 101.

[0033] The support assembly 200 is arranged between the two support plates 101, and includes a support tube 201, a socket 202, a guide member 203, a mounting member 204 and a connecting member 205. The support tube 201 is located between the two support plates 101, the socket 202 is fixed on the support plate 101 and is located on both sides of the support tube 201, the guide member 203 is arranged in the support tube 201, the mounting member 204 is arranged in the guide member 203, and the connecting member 205 is arranged on the top of the mounting member 204.

[0034] The support tube 201 is located between two symmetrical support plates 101. The receiving member 202 is used to support and fix the support tube 201. The flow guide member 203 is used to guide the water inside the support tube 201 to the middle position, thereby preventing a large amount of water from gathering at both ends. The mounting member 204 is used to install and fix the connecting member 205 to prevent it from falling during use. The connecting member 205 is used to guide the water in the second chamber S2 into the support tube 201.

[0035] There are mounting holes on both sides of the top of the support tube 201, and an arc-shaped closing plate is fixed by screws. The setting of the mounting holes enables the staff to install the connecting piece 205 more conveniently. A drain hole can also be opened at the bottom to drain the water in the support tube 201.

[0036] Example 2

[0037] Reference Figures 2 to 5 , which is the second embodiment of the present invention, and is based on the previous embodiment.

[0038] Specifically, the water seepage component 103 includes a first plate 103a, a second plate 103b and a wire mesh 103c. The first plate 103a is fixed to the bottom of the baffle 102, the second plate 103b is fixed to the inner bottom wall of the second chamber S2, the wire mesh 103c is fixed to one side of the support plate 101, and a water seepage hole K is opened on the outside of the support plate 101. The wire mesh 103c is located outside the water seepage hole K.

[0039] The first plate 103a is close to the side of the inner wall of the second chamber S2, and a seepage hole is formed between it and the inner bottom wall of the second chamber S2. A cavity is formed between the second plate 103b and the first plate 103a, and an overflow hole is formed between it and the baffle 102. The pores of the wire mesh 103c are small, and it fits with the soil on the inner wall of the foundation pit, which can prevent soil from entering the second chamber S2.

[0040] When the support is in use, water seeping from the soil slowly seeps into the second chamber S2 and is located on the outside of the first plate 103a. During long-term use, more and more water will gather on the side of the first plate 103a, and then enter between the first plate 103a and the second plate 103b through the seepage holes, and finally flow to the other side of the second plate 103b through the overflow holes for storage. This part of water increases the overall weight of the support plate 101, making its installation more stable.

[0041] The extrusion member 105 includes a hydraulic telescopic rod 105a, a movable plate 105b and a lifting plate 105c. The hydraulic telescopic rod 105a is fixed to the inner bottom wall of the second chamber S2, the movable plate 105b is fixed to the top of the hydraulic telescopic rod 105a and contacts the second plate 103b, and the lifting plate 105c is fixed to one side of the top of the movable plate 105b.

[0042] When the accumulated water in the second chamber S2 reaches the position of the water level sensor 104, the hydraulic telescopic rod 105a is activated, driving the movable plate 105b to move upward and lifting the accumulated water inside the second plate 103b upward. A sealing ring is provided on the top of the movable plate 105b to play a sealing role to prevent the accumulated water in the second chamber S2 from flowing to the bottom of the movable plate 105b, and a vent is provided at the bottom inside the second chamber S2 to prevent the movable plate 105b from being in a negative pressure state below during the up and down movement, thereby affecting its movement. The side of the lifting plate 105c is curved, which is used to guide the accumulated water to a certain extent and improve the discharge efficiency of the accumulated water.

[0043] The sealing member 106 includes a first sealing plate 106a, a push plate 106b and a second sealing plate 106c. The first sealing plate 106a slides on the top of one side of the second plate 103b, and a movable groove M is opened at its bottom. The push plate 106b slides in the movable groove M, and the bottom contacts the lifting plate 105c. The second sealing plate 106c is fixed to the bottom of one side of the push plate 106b. A drainage hole V is opened on one side of the support plate 101, and the second sealing plate 106c is located inside the drainage hole V.

[0044] A sealing treatment is performed between the first blocking plate 106a and the second plate 103b. When the first blocking plate 106a moves upward, the top contacts and seals with the baffle 102 to prevent the accumulated water from flowing back between the first plate 103a and the second plate 103b. The push plate 106b is located in the moving groove M, and a hole is provided on the top of the inner wall of the moving groove M to discharge the water entering the moving groove M. When the hydraulic telescopic rod 105a drives the moving plate 105b to move upward, the push plate 106b is pushed upward by the lifting plate 105c, and the first blocking plate is driven by the push plate 106b. 106a moves upward until its top contacts the baffle 102, thereby blocking the overflow hole to prevent the accumulated water from flowing back from the overflow hole when the movable plate 105b continues to move upward. Limiting grooves are provided on both sides of the first sealing plate 106a, and a limiting rod is fixed on the side of the second plate 103b, which slides in the limiting groove. The first sealing plate 106a is limited by the limiting rod and the limiting groove to prevent it from shifting during the up and down movement, and when the limiting rod is at the top of the limiting groove, the first sealing plate 106a is located at the lowest point of the overflow hole.

[0045] The second blocking plate 106c is divided into two parts, one part is L-shaped, one end of which is fixed to the bottom side of the push plate 106b, and the other part is rectangular. In the initial state, it is located on the drainage hole V and is used to seal the drainage hole V. A sealing treatment is performed between the two to prevent water leakage, etc. When the lifting plate 105c pushes the push plate 106b upward, the second blocking plate 106c moves up together to open the drainage hole V. At this time, the overflow hole is closed, and the accumulated water is discharged outward from the drainage hole V due to the pressure of the moving plate 105b until the moving plate 105b moves to the bottom of the drainage hole V. At this time, a part of the water will remain in the second chamber S2 to prevent the weight of the support plate 101 from being too low, affecting its stability.

[0046] The blocking member 106 further includes a first spring 106d, two ends of which are respectively fixed to the inner wall of the moving groove M and the top of the push plate 106b.

[0047] The first spring 106d applies downward pressure to the push plate 106b. In the initial state, the push plate 106b is located in a lower position in the movable groove M. When the water in the second chamber S2 is full, the push plate 106b is pushed downward by the elastic force of the first spring 106d and the gravity of the first blocking plate 106a itself, preventing it from moving upward due to the buoyancy of the water. The elastic force of the first spring 106d is relatively large. When the movable plate 105b pushes the push plate 106b upward, due to the elastic force of the first spring 106d, the first blocking plate 106a will first move upward until its top contacts the baffle 102. The push plate 106b will continue to move into the movable groove M and slowly fully open the drainage hole V, greatly improving the discharge efficiency of the accumulated water.

[0048] Example 3

[0049] Reference Figures 1 to 7 , which is the third embodiment of the present invention, and is based on the first two embodiments.

[0050] Specifically, the receiving member 202 includes a receiving plate 202a and a receiving rod 202b. The receiving plate 202a is fixed on the support plate 101 and is located on both sides of the support tube 201. The receiving rod 202b is fixed on both sides of the support tube 201. An inclined groove J is opened in the receiving plate 202a, and the receiving rod 202b slides in the inclined groove J.

[0051] The receiving plate 202a is trapezoidal, and its side close to the outside is inclined. In the initial state, the end of the support pipe 201 does not contact the supporting plate 101. The chute J is divided into two parts, the bottom is vertical, and the lower part is inclined. When the water in the support pipe 201 increases and its weight increases, it means that the soil on the inner wall of the foundation pit has been compressed, and the supporting plate 101 will slowly move toward the soil. At this time, the support pipe 201 and the receiving rod 202b will move downward, and the receiving rod 202b will slide in the inclined part of the chute J and push the supporting plate 101 toward the soil, so that it can be in contact with the soil more firmly and the supporting effect is better.

[0052] The flow guide 203 includes a fixed ring 203a and an inclined plate 203b. The fixed ring 203a is fixed to both sides of the inner wall of the support tube 201, and the inclined plate 203b is fixed to the inner side of the fixed ring 203a.

[0053] The fixing ring 203a is fitted with the inner wall of the support tube 201, and a rectangular hole is opened in the middle. The inclined plate 203b is inclined from the outside to the inside, and its highest point is located at the lowest point of the rectangular hole in the fixing ring 203a. The setting of the inclined plate 203b allows the accumulated water to flow to the middle position of the support tube 201 more efficiently.

[0054] The mounting member 204 includes a water baffle 204a, a movable plate 204b and a threaded rod 204c. The water baffle 204a is fixed in the fixed ring 203a, and a groove P is provided on the top thereof. The movable plate 204b slides in the groove P. The threaded rod 204c is rotatably connected to the bottom of the movable plate 204b. It is threadedly connected to the water baffle 204a, and the bottom end extends to the bottom of the support tube 201.

[0055] The water retaining plate 204a is rectangular and fits into the rectangular hole in the fixed ring 203a. The movable plate 204b and the groove P are sealed to prevent the backflow of accumulated water. When installing the support, the staff manually rotates the threaded rod 204c to drive the movable plate 204b to move up and down through the threaded rod 204c.

[0056] The connecting member 205 includes a connecting tube 205a, a movable door 205b and a stopper 205c. One end of the connecting tube 205a is fixed to the outside of the drainage hole V, and the other end is located at the top of the movable plate 204b. The movable door 205b is rotatably connected to the connecting tube 205a. The stopper 205c is fixed to the inner wall of the connecting tube 205a and contacts the movable door 205b.

[0057] The two ends of the connecting tube 205a are metal frames, one end of which is fixed to the outside of the drainage hole V, and the other end is located in the rectangular hole in the fixing ring 203a. There are protrusions fixed on both sides of the top, and corresponding grooves are provided in the rectangular hole. The protrusions are inserted into the grooves, and protrusions are fixed on both sides of the top of the movable plate 204b. The bottom of the connecting tube 205a is provided with a groove, which corresponds to the protrusions. The middle part of the connecting tube 205a is made of flexible material and can change according to the up and down movement of the support tube 201 to prevent it from bending. During installation, the metal frame at one end of the connecting tube 205a is first installed in the rectangular hole in the fixing ring 203a so that the protrusion is inserted into the groove in the rectangular hole. Then, the threaded rod 204c is manually rotated to drive the movable plate 204b to move upward through the threaded rod 204c, so that the protrusion on its top is inserted into the groove at the bottom of the metal frame, thereby completing the fixation of the connecting tube 205a, and a sealing treatment is performed between the two to prevent water leakage.

[0058] The bottom of the movable door 205b is hinged to the metal frame by a hinge, and the movable door 205b is limited by the block 205c to prevent the movable door 205b from deviating too much into the connecting pipe 205a and affecting its water-blocking effect. The movable door 205b can only rotate toward the outside of the connecting pipe 205a. When the accumulated water is discharged from the drainage hole V into the connecting pipe 205a, the water pressure pushes the movable door 205b open and passes into the support pipe 201. When the support pipe 201 moves downward due to its own gravity and the gravity of the water inside, the connecting pipe 205a can follow it and deviate to a certain extent without affecting its water delivery efficiency.

[0059] The connecting member 205 further includes a fixing block 205d and a second spring 205e. The fixing block 205d is fixed to the end of the connecting tube 205a. Both ends of the second spring 205e are fixed to the movable door 205b and the fixing block 205d respectively.

[0060] The fixed block 205d is rectangular and is used to limit the movable door 205b to prevent it from deviating too much to the outside and affecting its use. The second spring 205e applies a force to the movable door 205b to deviate toward the inside of the connecting pipe 205a. When the water flow decreases, the second spring 205e drives the movable door 205b to close to prevent water backflow, etc. Inspection holes are provided on both sides of the top of the support pipe 201. Under normal circumstances, the inspection hole is fixed with an arc plate by bolts to prevent excessive impurities from entering the support pipe 201.

[0061] During use, first install the support plate 101 at the designated position through the pre-buried steel pipe, and then install the support pipe 201 between the two symmetrical support plates 101. During long-term use, the water seeping out of the soil slowly seeps into the second chamber S2 and is located on the outside of the first plate 103a. During long-term use, more and more water will gather on the side of the first plate 103a, and then enter between the first plate 103a and the second plate 103b through the seepage hole, and finally flow to the other side of the second plate 103b through the overflow hole for storage. This part of water increases the overall weight of the support plate 101, making its installation more stable. When the accumulated water in the second chamber S2 reaches the position of the water level sensor 104, the hydraulic telescopic rod 105a is activated, driving the movable plate 105b to move upward, and The accumulated water on the inner side of the second plate 103b is pushed upward. At this time, the push plate 106b is pushed upward by the lifting plate 105c, and the first blocking plate 106a is driven to move upward by the push plate 106b until its top contacts the baffle 102, thereby blocking the overflow hole to prevent the accumulated water from flowing back from the overflow hole when the movable plate 105b continues to move upward. At the same time, the second blocking plate 106c moves upward together to open the drainage hole V. At this time, the overflow hole is closed, and the accumulated water is discharged from the drainage hole V to the connecting pipe 205a due to the pressure of the movable plate 105b. The water pressure pushes the movable door 205b open and passes into the support pipe 201. When the support pipe 201 moves downward due to its own gravity and the gravity of the internal water, the connecting pipe 205a can follow it to a certain extent without affecting its water supply efficiency.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pressure-proof foundation pit support structure, characterized by: include, A support assembly (100) comprises a support plate (101), a baffle (102), a water seepage member (103), a water level sensor (104), an extrusion member (105) and a blocking member (106); the baffle (102) is fixed in the support plate (101), and its interior is divided into an upper first chamber (S1) and a lower second chamber (S2); the water seepage member (103) is located in the second chamber (S2); the water level sensor (104) is fixed to the inner wall of the second chamber (S2); the extrusion member (105) is arranged at the bottom of one side of the water seepage member (103); and the blocking member (106) slides on the water seepage member (103); and A support assembly (200) is arranged between the two support plates (101), comprising a support tube (201), a receiving member (202), a flow guide member (203), a mounting member (204) and a connecting member (205); the support tube (201) is located between the two support plates (101); the receiving member (202) is fixed to the support plates (101) and is located on both sides of the support tube (201); the flow guide member (203) is arranged in the support tube (201); the mounting member (204) is arranged in the flow guide member (203); and the connecting member (205) is arranged on the top of the mounting member (204); The water seepage member (103) comprises a first plate (103a), a second plate (103b) and a wire mesh (103c), wherein the first plate (103a) is fixed to the bottom of the baffle (102), the second plate (103b) is fixed to the inner bottom wall of the second chamber (S2), the wire mesh (103c) is fixed to one side of the support plate (101), a water seepage hole (K) is provided on the outer side of the support plate (101), the wire mesh (103c) is located outside the water seepage hole (K), the first plate (103a) is close to the side of the inner wall of the second chamber (S2), a water seepage hole is formed between the first plate (103a) and the inner bottom wall of the second chamber (S2), a cavity is formed between the second plate (103b) and the first plate (103a), and an overflow hole is formed between the second plate (103b) and the baffle (102); The extrusion member (105) includes a hydraulic telescopic rod (105a), a movable plate (105b) and a lifting plate (105c), wherein the hydraulic telescopic rod (105a) is fixed to the inner bottom wall of the second chamber (S2), the movable plate (105b) is fixed to the top of the hydraulic telescopic rod (105a) and contacts the second plate (103b), and the lifting plate (105c) is fixed to one side of the top of the movable plate (105b); The blocking member (106) includes a first blocking plate (106a), a push plate (106b) and a second blocking plate (106c). The first blocking plate (106a) slides on the top of one side of the second plate (103b), and a movable groove (M) is provided at the bottom thereof. The push plate (106b) slides in the movable groove (M), and the bottom thereof contacts the lifting plate (105c). The second blocking plate (106c) is fixed to the bottom of one side of the push plate (106b). A drainage hole (V) is opened, and the second blocking plate (106c) is located inside the drainage hole (V). The second blocking plate (106c) is divided into two parts, one part is L-shaped, one end of which is fixed to the bottom of the side of the push plate (106b), and the other part is rectangular. In the initial state, it is located on the drainage hole (V). When the lifting plate (105c) pushes the push plate (106b) upward, the second blocking plate (106c) moves upward together to open the drainage hole (V), and the overflow hole is closed at this time.

2. The pressure-proof foundation pit support structure according to claim 1, characterized in that: The blocking member (106) further includes a first spring (106d), both ends of which are respectively fixed to the inner wall of the movable groove (M) and the top of the push plate (106b).

3. The pressure-proof foundation pit support structure according to claim 2, characterized in that: The receiving member (202) comprises a receiving plate (202a) and a receiving rod (202b); the receiving plate (202a) is fixed on the supporting plate (101) and is located on both sides of the support tube (201); the receiving rod (202b) is fixed on both sides of the support tube (201); an inclined groove (J) is provided in the receiving plate (202a), and the receiving rod (202b) slides in the inclined groove (J).

4. The pressure-proof foundation pit support structure according to claim 3, characterized in that: The flow guide (203) comprises a fixed ring (203a) and an inclined plate (203b), wherein the fixed ring (203a) is fixed to both sides of the inner wall of the support tube (201), and the inclined plate (203b) is fixed to the inner side of the fixed ring (203a).

5. The pressure-proof foundation pit support structure according to claim 4, characterized in that: The mounting member (204) includes a water baffle (204a), a movable plate (204b) and a threaded rod (204c); the water baffle (204a) is fixed in the fixing ring (203a), a groove (P) is provided on the top of the water baffle, the movable plate (204b) slides in the groove (P), and the threaded rod (204c) is rotatably connected to the bottom of the movable plate (204b), is threadedly connected to the water baffle (204a), and the bottom end extends to the bottom of the support tube (201).

6. The pressure-proof foundation pit support structure according to claim 5, characterized in that: The connecting member (205) includes a connecting tube (205a), a movable door (205b) and a stopper (205c), one end of the connecting tube (205a) is fixed to the outside of the drainage hole (V), and the other end is located at the top of the movable plate (204b), the movable door (205b) is rotatably connected to the inside of the connecting tube (205a), and the stopper (205c) is fixed to the inner wall of the connecting tube (205a) and contacts the movable door (205b).

7. The pressure-proof foundation pit support structure according to claim 6, characterized in that: The connecting member (205) further comprises a fixed block (205d) and a second spring (205e), wherein the fixed block (205d) is fixed to the end of the connecting pipe (205a), and the two ends of the second spring (205e) are respectively fixed to the movable door (205b) and the fixed block (205d).

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