A foundation pit side wall seepage position treatment structure and construction method

Abstract

The present invention discloses a structure for treating water seepage on the side wall of a foundation pit and a construction method thereof. The treatment structure comprises a retaining wall structure, a water collecting structure, a backfill structure and a pumping structure. The retaining wall structure is arranged around the outer periphery of the water seepage side wall of the foundation pit and forms a water retaining pit structure with the side wall of the foundation pit. The backfill structure is located in the retaining wall structure. The water collecting structure and the pumping structure are arranged in the backfill structure, and the pumping structure is located in the water collecting structure. The present invention adopts a closed structure, which not only realizes waterproofing of the foundation pit, but also avoids the problems of structural stability and safety caused by water seepage on the scouring of the foundation pit. At the same time, it can also be used as a working surface for subsequent construction operations, reducing construction procedures and effectively shortening the construction period. The water seepage is collected together by the water collecting structure and then discharged uniformly, which will not damage the foundation pit structure and avoid the influence of water seepage on the foundation pit structure. At the same time, the closed structure has a strong waterproof effect and can effectively avoid the influence of water seepage on the building structure.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit construction, and in particular to a foundation pit side wall seepage position treatment structure and a construction method. Background Art

[0002] With the rapid development of underground buildings, there are more and more foundation pit projects. During the foundation pit construction process, waterproofing has always been an important construction content of the foundation pit construction. In response to water leakage from the side walls of the foundation pit, the general construction method is to set up a ditch at the bottom of the foundation pit and add a water pump to pump out the water. There is also a hanging board method disclosed in CN104947683A to prevent water seepage. However, on the one hand, the leakage water in the above construction method has a greater impact on the side walls of the foundation pit, affecting the overall safety of the foundation pit; on the other hand, the open drainage method occupies the foundation pit fertilizer trough, and to a certain extent occupies the working surface of the basement outer wall and the ground-type external scaffolding, which indirectly causes an increase in the construction period. The present invention provides a foundation pit side wall seepage position treatment structure and construction method to solve the above problems. Summary of the Invention

[0003] The present invention provides a foundation pit side wall seepage position treatment structure and a construction method, which adopts a closed waterproof structure, thereby ensuring the waterproof effect and enhancing the stability and safety of the foundation pit structure.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A structure for treating water seepage on the sidewall of a foundation pit, comprising a retaining wall structure, a water collection structure, a backfill structure, and a pumping structure. The retaining wall structure is arranged around the outer periphery of the water seepage sidewall of the foundation pit to form a water retaining pit structure with the sidewall of the foundation pit. The backfill structure is located in the retaining wall structure. The water collection structure and the pumping structure are arranged in the backfill structure. The pumping structure is located in the water collection structure.

[0006] The water collection structure includes a seepage channel and a water collection pipe. The seepage channel includes an upper seepage pit, a connecting channel and a lower seepage pit. The upper seepage pit is horizontally arranged at the upper part of the seepage area, and the lower seepage pit is horizontally arranged at the lower part of the seepage area, below the upper seepage pit. The water collection pipe is horizontally arranged at the bottom of the foundation pit, below the lower seepage pit. The connecting channel is arranged between the upper seepage pit and the lower seepage pit, and between the lower seepage pit and the water collection pipe to form mutually connected seepage channels. The water collection pipe is connected to the pumping structure.

[0007] Furthermore, the pumping structure includes a pumping system and a pumping channel. The pumping channel is vertically arranged in the backfill structure. The top of the pumping channel passes through the backfill structure and is exposed, and the bottom is located at the bottom of the foundation pit. One end of the water collection structure is located in the pumping channel, and the pumping port of the pumping system is arranged at the bottom of the pumping channel.

[0008] Furthermore, the backfill structure includes a reinforcement structure, a waterproof layer, backfill, a water-blocking tape and a closed structure. The reinforcement structure is arranged at the root of the foundation pit side wall at the seepage point, the waterproof layer is arranged at the bottom of the foundation pit between the retaining wall structure and the foundation pit side wall, the water-blocking tape is arranged on the inner side of the retaining wall structure, the backfill is arranged on the waterproof layer, and is located between the retaining wall structure and the foundation pit side wall. The closed structure is arranged at the top of the water-retaining pit structure, and the edge of the closed structure is connected to the foundation pit side wall, the water-blocking tape and the retaining wall structure.

[0009] Furthermore, the water-blocking belt includes a water-blocking plate and a water-blocking wall. The water-blocking wall is arranged on the inner side of the retaining wall structure to form a stepped wall structure with the retaining wall structure. The water-blocking plate is a U-shaped structure, with the lower part of its outer side located on the inner side of the water-blocking wall and the upper part of its outer side located on the inner side of the retaining wall structure. The top of the water-blocking plate is connected to the closed structure.

[0010] Furthermore, the outer plate of the water blocking plate is stepped and is arranged in close contact with the stepped wall structure. The inner side of the water blocking plate is connected to the side wall of the foundation pit, and the left and right sides of the water blocking plate are located on the left and right sides of the water retaining pit structure.

[0011] Furthermore, the closed structure includes a leveling layer, an adhesive layer and a sealing layer, and the leveling layer, adhesive layer and sealing layer are arranged layer by layer from bottom to top. The leveling layer is arranged on the backfill, and the sealing layer is connected to the retaining wall structure, foundation pit and water blocking tape.

[0012] Furthermore, the water blocking plate is a steel plate, the retaining wall structure and the enclosing layer are reinforced concrete structures, and the steel skeleton of the enclosing layer is connected to the steel skeleton of the water blocking plate and the retaining wall structure.

[0013] Furthermore, the water collecting pipe is provided with a water inlet hole, and the bottom end of the communication channel between the infiltration pit and the water collecting pipe is connected to the water inlet hole.

[0014] Preferably, the infiltration pit, the connecting channel, the infiltration pit and the pumping channel are all steel cages, and the steel cages include a steel skeleton and a steel mesh, and the steel mesh is laid on the outside of the steel skeleton.

[0015] A construction method for treating a seepage position on a foundation pit sidewall comprises the following construction steps:

[0016] S1, construction of retaining wall structure: carry out the construction of retaining wall structure according to the operations of steel bar binding, formwork setting and concrete pouring, and reserve the connection structure with the enclosed structure;

[0017] S2, reinforcement structure back to the top: Place the reinforcement structure at the root of the foundation pit side wall to support the foundation pit root, and at the same time make the seepage channel and pumping channel;

[0018] S3, backfill structure bottom construction: first lay the waterproof layer, lay the bottom backfill material to fix the waterproof layer, and then construct the water blocking tape;

[0019] S4, constructing the water collection structure: first place and fix the water collection pipe, then fill the backfill layer by layer. When filling, place and fix the upper and lower infiltration pits at the designed positions, and connect and fix the connecting channels at the same time;

[0020] S5, constructing the pumping structure; after the water collecting pipe is placed and fixed in step S4, the assembled pumping channel is placed vertically and connected to the water collecting pipe;

[0021] S6, backfill structure upper construction: backfill to the top, then carry out the construction of the closed structure, connect the closed structure with the retaining wall structure to form an integrated structure;

[0022] S7, pumping operation: carry out pumping operation according to the water seepage situation.

[0023] The beneficial effects of the present invention are as follows:

[0024] The closed structure not only achieves waterproofing of the foundation pit, but also avoids the problems of structural stability and safety caused by water seepage scouring the foundation pit. At the same time, it can also serve as a working surface for subsequent construction operations, reducing construction procedures and effectively shortening the construction period.

[0025] The seepage water is collected together through the water collection structure and then discharged uniformly. The water collection structure only allows the seepage water to flow. The seepage water cannot carry the soil and will not damage the foundation pit structure, thus avoiding the impact of the seepage water on the foundation pit structure. At the same time, the closed structure has a strong waterproof effect, which can effectively avoid the impact of the seepage water on the building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the top view of the structure of the present invention;

[0027] Figure 2 for Figure 1 Middle AA cross-sectional view;

[0028] Figure 3 for Figure 1 Schematic diagram of the BB cross section;

[0029] Figure 4 for Figure 3 Schematic diagram of CC cross section;

[0030] Figure 5 It is a schematic diagram of the structure of the water-blocking tape of the present invention.

[0031] Figure numerals: 1-retaining wall structure, 2-water collection structure, 21-water collection pipe, 22-upper infiltration pit, 23-connecting channel, 24-lower infiltration pit, 3-backfill structure, 31-reinforcement structure, 32-waterproof layer, 33-water blocking belt, 331-water blocking board, 332-water blocking wall, 34-closed structure, 35-backfill, 4-pumping structure, 41-pumping system, 42-pumping channel. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this patent.

[0034] like Figure 1 、 2 As shown in Figures 3 and 4, a structure for processing the seepage position of the foundation pit side wall includes a retaining wall structure 1, a water collecting structure 2, a backfill structure 3 and a pumping structure 4. The retaining wall structure 1 is arranged around the outer periphery of the foundation pit seepage side wall to form a water retaining pit structure with the foundation pit side wall. The backfill structure 3 is located in the retaining wall structure 1, the water collecting structure 2 and the pumping structure 4 are arranged in the backfill structure 3, and the pumping structure 4 is located in the water collecting structure 2.

[0035] A water retaining area is formed between the retaining wall structure 1 of the present invention and the foundation pit, and a closed anti-seepage structure is formed after filling the backfill structure 3. The foundation pit seepage water is collected by the water collection structure 2 arranged in the backfill structure 3 and pumped out by the pumping structure 4 to prevent the seepage water from continuing to leak into the interior of the building.

[0036] like Figure 2As shown, the water collection structure 2 includes a seepage channel and a water collection pipe 21. The seepage channel includes an upper seepage pit 22, a connecting channel 23 and a lower seepage pit 24. The upper seepage pit 22 is horizontally arranged at the upper part of the seepage area, and the lower seepage pit 24 is horizontally arranged at the lower part of the seepage area, located below the upper seepage pit 22. The upper seepage pit 22 and the lower seepage pit 24 are used to collect water in the seepage area. The upper seepage pit 22 is used to directly collect seepage water, collect most of the seepage water, and the lower seepage pit 24 is used to collect water from the seepage area. The water pit 24 collects seepage water that leaks downward, collecting as much of it as possible to prevent it from flowing along the side walls of the foundation pit and damaging the foundation pit and anti-seepage structure. The water collecting pipe 21 is horizontally arranged at the bottom of the foundation pit, below the lower seepage pit 24. The connecting channel 23 is arranged between the upper seepage pit 22 and the lower seepage pit 24, and between the lower seepage pit 24 and the water collecting pipe 21, forming a mutually interconnected seepage channel. The water collecting pipe 21 is connected to the pumping structure 4. The upper seepage pit 22 and the lower seepage pit 24 are used to collect seepage water, the connecting channel 23 is used to transport the collected seepage water, and the water collecting pipe 21 serves as a structure for collecting and discharging the seepage water.

[0037] The upper infiltration pit 22, the lower infiltration pit 24 and the water collecting pipe 21 form a complete seepage collection structure from top to bottom. The upper infiltration pit 22 directly collects the seepage water in the seepage area and discharges the collected seepage water into the water collecting pipe 21 along the connecting channel 23, while the lower infiltration pit 24 collects the seepage water leaking along the side wall of the foundation pit, and then discharges the collected seepage water into the water collecting pipe 21 along the connecting channel 23. The seepage water in the water collecting pipe 21 is discharged through the pumping structure 4.

[0038] like Figure 3 As shown, further, the pumping structure 4 includes a pumping system 41 and a pumping channel 42. The pumping channel 42 is vertically arranged in the backfill structure 3. The top of the pumping channel 42 passes through the backfill structure 3 and is exposed to achieve communication with the outside. The bottom is located at the bottom of the foundation pit. One end of the water collection structure 2 is located in the pumping channel 42. The pumping port of the pumping system 41 is located at the bottom of the pumping channel 42.

[0039] like Figure 2 、 3 As shown, further, the backfill structure 3 includes a reinforcement structure 31, a waterproof layer 32, a water-blocking tape 33, a closed structure 34 and a backfill 35. The reinforcement structure 31 is arranged at the root of the foundation pit side wall at the seepage point, the waterproof layer 32 is arranged at the bottom of the foundation pit between the retaining wall structure 1 and the foundation pit side wall, the water-blocking tape 33 is arranged on the inner side of the retaining wall structure 1, the backfill 35 is arranged on the waterproof layer 32, and is located between the retaining wall structure 1 and the foundation pit side wall. The closed structure 34 is arranged at the top of the water-retaining pit structure, and the edge of the closed structure 34 is connected to the foundation pit side wall, the water-blocking tape 33 and the retaining wall structure 1.

[0040] The backfill structure 3 is used to fill and close the water retaining area, ensuring that the water retaining area forms a stable closed structure, which can be used as a working surface for subsequent construction operations; and has water-blocking, anti-seepage and reinforcement functions, ensuring that the entire water retaining area has sufficient structural stability and safety.

[0041] like Figure 2 、 3 4, further, the water blocking strip 33 includes a water blocking plate 331 and a water blocking wall 332, the water blocking wall 332 is arranged on the inner side of the retaining wall structure 1, and forms a stepped wall structure with the retaining wall structure 1, the water blocking plate 331 is a U-shaped structure, the lower part of the outer side is located on the inner side of the water blocking wall 332, and the upper part of the outer side is located on the inner side of the retaining wall structure 1, and the top of the water blocking plate 331 is connected to the closed structure 34.

[0042] The water-blocking strip 33 is a vertically arranged U-shaped groove structure, which seals the water retaining pit structure between the retaining wall structure 1 and the side wall of the foundation pit, playing the main role of water blocking, preventing water from seeping into the building along the retaining wall structure 1. The water-blocking wall 332 and the retaining wall structure 1 support the water-blocking plate 331 to keep it stable.

[0043] like Figure 5 As shown, further, the outer plate of the water blocking plate 331 is stepped and is arranged in close contact with the stepped wall structure. The inner side of the water blocking plate 331 is connected to the side wall of the foundation pit, and the left and right sides of the water blocking plate 331 are located on the left and right sides of the water retaining pit structure.

[0044] like Figure 2 、 3 As shown, further, the closed structure 34 includes a leveling layer, an adhesive layer and a sealing layer, and the leveling layer, adhesive layer and sealing layer are arranged layer by layer from bottom to top, the leveling layer is arranged on the backfill 35, and the sealing layer is connected to the retaining wall structure 1, the foundation pit and the water-blocking tape 33.

[0045] Furthermore, the water blocking plate 331 is a steel plate, the retaining wall structure 1 and the enclosing layer are reinforced concrete structures, and the steel skeleton of the enclosing layer is connected to the steel skeletons of the water blocking plate 331 and the retaining wall structure 1 .

[0046] Furthermore, the water collecting pipe 21 is provided with a water inlet hole, and the bottom end of the communication channel 23 between the infiltration pit 24 and the water collecting pipe 21 is connected to the water inlet hole.

[0047] Preferably, the upper infiltration pit 22, the connecting channel 23, the lower infiltration pit 24 and the pumping channel 42 are all steel cages, and the steel cage includes a steel skeleton and a steel mesh, and the steel mesh is laid outside the steel skeleton.

[0048] Preferably, the steel skeleton of the upper infiltration pit 22, the connecting channel 23 and the lower infiltration pit 24 is welded with steel bars of 12 mm in diameter into a cylindrical skeleton of 200 mm in diameter, the steel mesh is a steel mesh with an aperture of not more than 1.5 mm, and the pumping channel 42 is welded with a diameter of 12 mm into a 500*500 mm square steel cage, the length of which is determined according to the depth of the foundation pit, and the outside of the cage is wrapped with a steel mesh with an aperture of not more than 1.5 mm.

[0049] Preferably, the reinforcement structure 31 is a sandbag, the waterproof layer 32 is a waterproof cloth, the water blocking plate 331 is a steel plate, the water blocking wall 332 is a pile of fine-grained soil, the leveling layer, the bonding layer and the sealing layer are a fine sand leveling layer, a non-woven fabric layer and a reinforced concrete layer respectively, and the backfill 35 is gravel with a particle size of 30-50 mm.

[0050] Preferably, the top of the water blocking plate 331 is fixedly connected to the skeleton of the sealing layer as a whole, the bottom end of the water blocking plate 331 is bent and extends under the waterproof layer 32, and the edge of the waterproof layer 32 is folded upward and adhered to the inner wall of the water blocking plate 331, thereby sealing the water retaining pit structure and enhancing the water blocking effect of the water blocking plate 331.

[0051] A construction method for treating a seepage position on a foundation pit sidewall comprises the following construction steps:

[0052] S1, construction of retaining wall structure: construction of retaining wall structure 1 is carried out according to the operations of tying steel bars, setting up formwork and pouring concrete, and reservation of connection structure with enclosing structure 34;

[0053] S2, reinforcing the structure back to the top: placing the reinforcing structure at the base of the foundation pit sidewall to support the base of the foundation pit, and at the same time making the seepage channel and the pumping channel 42;

[0054] S3, backfill structure bottom construction: first lay the waterproof layer 32, lay the bottom backfill 35 to fix the waterproof layer 32, and then construct the water blocking tape 33;

[0055] S4, constructing the water collection structure: first, the water collection pipe 21 is placed and fixed, and then the backfill 35 is filled layer by layer. During the filling process, the upper infiltration pit 22 and the lower infiltration pit 24 are placed and fixed at the designed positions, and the connecting channel 23 is connected and fixed at the same time;

[0056] S5, construction of the pumping structure; in step S4, after the water collecting pipe 21 is placed and fixed, the assembled pumping channel 42 is placed vertically and connected to the water collecting pipe 21;

[0057] S6, backfill structure upper construction: backfill material 35 is filled to the top, and then the closed structure 34 is constructed, and the closed structure 34 is connected to the retaining wall structure 1 to form an integrated structure;

[0058] S7, pumping operation: carry out pumping operation according to the water seepage situation.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

Claims

1. A structure for treating water seepage on the sidewall of a foundation pit, characterized in that: The invention comprises a retaining wall structure (1), a water collection structure (2), a backfill structure (3) and a pumping structure (4), wherein the retaining wall structure (1) is arranged around the outer periphery of the seepage side wall of the foundation pit to form a water retaining pit structure with the foundation pit side wall, the backfill structure (3) is located in the retaining wall structure (1), the water collection structure (2) and the pumping structure (4) are arranged in the backfill structure (3), and the pumping structure (4) is located in the water collection structure (2); The water collection structure (2) includes a water seepage channel and a water collection pipe (21), the water seepage channel includes an upper water seepage pit (22), a connecting channel (23) and a lower water seepage pit (24), the upper water seepage pit (22) is horizontally arranged at the upper part of the water seepage area, the lower water seepage pit (24) is horizontally arranged at the lower part of the water seepage area, and is located below the upper water seepage pit (22), the water collection pipe (21) is horizontally arranged at the bottom of the foundation pit, and is located below the lower water seepage pit (24), the connecting channel (23) is arranged between the upper water seepage pit (22) and the lower water seepage pit (24), and between the lower water seepage pit (24) and the water collection pipe (21), forming mutually connected water seepage channels, and the water collection pipe (21) is connected to the pumping structure (4); The pumping structure (4) includes a pumping system (41) and a pumping channel (42). The pumping channel (42) is vertically arranged in the backfill structure (3). The top of the pumping channel (42) passes through the backfill structure (3) and is exposed. The bottom of the pumping channel (42) is located at the bottom of the foundation pit. One end of the water collection structure (2) is located in the pumping channel (42). The pumping port of the pumping system (41) is located at the bottom of the pumping channel (42). The backfill structure (3) comprises a reinforcement structure (31), a waterproof layer (32), a water blocking strip (33), a closed structure (34) and a backfill (35), wherein the reinforcement structure (31) is provided at the root of the foundation pit side wall at the water seepage point, the waterproof layer (32) is provided at the bottom of the foundation pit between the retaining wall structure (1) and the foundation pit side wall, the water blocking strip (33) is provided on the inner side of the retaining wall structure (1), the backfill (35) is provided on the waterproof layer (32) and is located between the retaining wall structure (1) and the foundation pit side wall, the closed structure (34) is provided at the top of the water retaining pit structure, and the edge of the closed structure (34) is connected to the foundation pit side wall, the water blocking strip (33) and the retaining wall structure (1); The water blocking strip (33) comprises a water blocking plate (331) and a water blocking wall (332); the water blocking wall (332) is arranged on the inner side of the retaining wall structure (1) and forms a stepped wall structure with the retaining wall structure (1); the water blocking plate (331) is a U-shaped structure, with the lower portion of the outer side thereof being located on the inner side of the water blocking wall (332) and the upper portion of the outer side being located on the inner side of the retaining wall structure (1); and the top end of the water blocking plate (331) is connected to the closed structure (34); The outer side of the water blocking plate (331) is stepped and is arranged in close contact with the stepped wall structure. The inner side of the water blocking plate (331) is connected to the side wall of the foundation pit. The left and right sides of the water blocking plate (331) are located on the left and right sides of the water retaining pit structure.

2. The structure for treating water seepage on the sidewall of a foundation pit according to claim 1, wherein: The closed structure (34) comprises a leveling layer, an adhesive layer and a closed layer, wherein the leveling layer, the adhesive layer and the closed layer are arranged layer by layer from bottom to top, the leveling layer is arranged on the backfill (35), and the closed layer is connected to the retaining wall structure (1), the foundation pit and the water blocking tape (33).

3. The structure for treating water seepage on the sidewall of a foundation pit according to claim 2, wherein: The water blocking plate (331) is a steel plate, the retaining wall structure (1) and the enclosing layer are reinforced concrete structures, and the steel skeleton of the enclosing layer is connected to the steel skeletons of the water blocking plate (331) and the retaining wall structure (1).

4. The structure for treating water seepage on the sidewall of a foundation pit according to claim 2, wherein: The water collecting pipe (21) is provided with a water inlet hole, and the bottom end of the communication channel (23) between the infiltration pit (24) and the water collecting pipe (21) is connected to the water inlet hole.

5. The structure for treating water seepage on the sidewall of a foundation pit according to claim 1, wherein: The upper infiltration pit (22), the connecting channel (23), the lower infiltration pit (24) and the pumping channel (42) are all steel cages, and the steel cages include a steel skeleton and a steel mesh, and the steel mesh is laid outside the steel skeleton.

6. The construction method of a foundation pit side wall seepage position treatment structure according to claim 1, characterized in that: The construction steps include: S1, construction of retaining wall structure: the retaining wall structure (1) is constructed according to the operations of tying steel bars, setting up formwork and pouring concrete, and a connection structure with the enclosing structure (34) is reserved; S2, reinforcement structure back to the top: placing reinforcement structure at the base of the foundation pit side wall to support the base of the foundation pit, and at the same time making seepage channels and pumping channels (42); S3, backfill structure bottom construction: first lay the waterproof layer (32), lay the bottom backfill (35) to fix the waterproof layer (32), and then construct the water blocking tape (33); S4, constructing the water collection structure: first, the water collection pipe (21) is placed and fixed, and then the backfill (35) is filled layer by layer. When filling, the upper seepage pit (22) and the lower seepage pit (24) are placed and fixed at the designed position, and the connecting channel (23) is connected and fixed at the same time; S5, constructing the pumping structure; in step S4, after the water collecting pipe (21) is placed and fixed, the assembled pumping channel (42) is placed vertically and connected to the water collecting pipe (21); S6, backfill structure upper construction: backfill material (35) is filled to the top, and then the closed structure (34) is constructed, and the closed structure (34) is connected to the retaining wall structure (1) to form an integrated structure; S7, pumping operation: carry out pumping operation according to the water seepage situation.

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