CN219261044U - Waterproof drainage system for seepage of side wall of foundation pit - Google Patents
Waterproof drainage system for seepage of side wall of foundation pit Download PDFInfo
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- CN219261044U CN219261044U CN202320866149.2U CN202320866149U CN219261044U CN 219261044 U CN219261044 U CN 219261044U CN 202320866149 U CN202320866149 U CN 202320866149U CN 219261044 U CN219261044 U CN 219261044U
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Abstract
The utility model discloses a waterproof drainage system for seepage of a side wall of a foundation pit, which comprises a retaining wall structure, a water collecting structure, a backfilling structure and a water pumping structure, wherein the retaining wall structure is arranged on the periphery of the seepage side wall of the foundation pit in a surrounding mode, a water retaining pit structure is formed between the retaining wall structure and the side wall of the foundation pit, the backfilling structure is arranged in the retaining wall structure, the water collecting structure and the water pumping structure are arranged in the backfilling structure, and the water pumping structure is arranged in the water collecting structure. The utility model adopts a closed structure, thereby not only realizing the waterproof of the foundation pit, but also avoiding the problems of structural stability and safety caused by water seepage to the foundation pit, and simultaneously being capable of being used as a working face for subsequent construction operation, reducing construction procedures and effectively reducing construction period; the water seepage is concentrated together through the water collecting structure and then uniformly discharged, the foundation pit structure cannot be damaged, the influence of water seepage on the foundation pit structure is avoided, meanwhile, the closed structure has a strong waterproof effect, and the influence of water seepage on the building structure can be effectively avoided.
Description
Technical Field
The utility model relates to the technical field of foundation pit waterproof construction, in particular to a waterproof drainage system for seepage of side walls of a foundation pit.
Background
With rapid development of underground buildings, foundation pit engineering is more and more, and in the foundation pit construction process, waterproof operation is always an important construction content of foundation pit construction. Aiming at the water leakage of the side wall of the foundation pit, the general construction mode adopts a mode of arranging a ditch open drainage water pump drainage mode at the bottom of the foundation pit and adopts a hanging plate mode as disclosed in CN104947683A to prevent water seepage, but the construction mode has the advantages that on one hand, the water leakage is larger to the side wall of the foundation pit, and the integral safety of the foundation pit is influenced; on the other hand, the exposed arrangement mode occupies the foundation pit fertilizer groove, occupies the working surfaces of the basement outer wall and the floor type outer scaffold to a certain extent, and indirectly causes the construction period to be prolonged. The present utility model provides a waterproof drainage system for foundation pit sidewall water seepage which solves the above problems.
Disclosure of Invention
The utility model provides a waterproof drainage system for seepage of a side wall of a foundation pit, which adopts a closed waterproof structure, so that the waterproof effect is ensured, and the stability and safety of the foundation pit structure are enhanced.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the waterproof drainage system for the side wall water seepage of the foundation pit comprises a retaining wall structure, a water collecting structure, a backfilling structure and a water pumping structure, wherein the retaining wall structure is arranged on the periphery of the side wall water seepage of the foundation pit in a surrounding mode, a water retaining pit structure is formed between the retaining wall structure and the side wall of the foundation pit, the backfilling structure is arranged in the retaining wall structure, the water collecting structure and the water pumping structure are arranged in the backfilling structure, and the water pumping structure is arranged in the water collecting structure;
the water collecting structure comprises a water seepage channel and a water collecting pipe, the water seepage channel comprises an upper water seepage pit, a communicating channel and a lower water seepage pit, the upper water seepage pit is horizontally arranged at the upper part of the water seepage area, the lower water seepage pit is horizontally arranged at the lower part of the water seepage area and is positioned below the upper water seepage pit, the water collecting pipe is horizontally arranged at the bottom of the foundation pit and is positioned below the lower water seepage pit, the communicating channel is arranged between the upper water seepage pit and the lower water seepage pit and between the lower water seepage pit and the water collecting pipe to form mutually communicated water seepage channels, and the water collecting pipe is communicated with the water pumping structure;
the backfill structure comprises a reinforcing structure, a waterproof layer, backfill, a water blocking belt and a sealing structure, wherein the reinforcing structure is arranged at the root of the side wall of the foundation pit at a water seepage point, the waterproof layer is arranged at the bottom of the foundation pit between the retaining wall structure and the side wall of the foundation pit, the water blocking belt is arranged at the inner side of the retaining wall structure, the backfill is arranged on the waterproof layer and is positioned between the retaining wall structure and the side wall of the foundation pit, the sealing structure is arranged at the top of the water blocking pit structure, and the edge of the sealing structure is connected with the side wall of the foundation pit, the water blocking belt and the retaining wall structure;
the water-blocking belt comprises a water-blocking plate and a water-blocking wall, the water-blocking wall is arranged on the inner side of the retaining wall structure and forms a step wall structure with the retaining wall structure, the water-blocking plate is of a U-shaped structure, the lower part of the water-blocking plate on the outer side of the water-blocking plate is positioned on the inner side of the water-blocking wall, and the upper part of the water-blocking plate on the outer side of the water-blocking plate is positioned on the inner side of the retaining wall structure;
the bottom of the water-blocking plate is positioned in the waterproof layer, and the top of the water-blocking plate is connected with the closed structure and the retaining wall structure.
Further, the structure of drawing water includes the system of drawing water and draws water the passageway, the passageway vertical setting of drawing water is in backfilling the structure, the top of passageway of drawing water wears out the backfilling structure and exposes, and its bottom is located the foundation ditch bottom, the one end of catchment structure is located the passageway of drawing water, the mouth of drawing water of the system of drawing water is established in the bottom of passageway of drawing water.
Further, the outer side plate of the water blocking plate is in a step type and is attached to the step wall structure, the inner side edge of the water blocking plate is connected to the side wall of the foundation pit, and the left side edge and the right side edge of the water blocking plate are located on the left side and the right side of the water blocking pit structure.
Further, the closed structure 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 a backfill, and the closed layer is connected with the retaining wall structure, the foundation pit and the water-blocking belt.
Further, the water blocking plate is a steel plate, the retaining wall structure and the sealing layer are of reinforced concrete structures, and the reinforcement cage of the sealing layer is connected with the water blocking plate and the reinforcement cage of the retaining wall structure.
Further, a water inlet hole is arranged on the water collecting pipe, and the bottom end of the communication channel between the lower water seepage pit and the water collecting pipe is connected in the water inlet hole.
Preferably, the upper water seepage pit, the communication channel, the lower water seepage pit and the water pumping channel are steel reinforcement cages, each steel reinforcement cage comprises a steel reinforcement framework and a steel reinforcement net, and the steel reinforcement net is laid on the outer side of the steel reinforcement framework.
The utility model has the following beneficial effects:
the closed structure is adopted, so that the waterproof of the foundation pit is realized, the problems of structural stability and safety caused by water seepage to the foundation pit are avoided, meanwhile, the closed structure can also be used as a working face for subsequent construction operation, the construction procedures are reduced, and the construction period is effectively shortened;
the water seepage is concentrated together through the water collecting structure and then uniformly discharged, the water collecting structure only allows water seepage to flow, the water seepage cannot carry soil, the foundation pit structure cannot be damaged, the influence of water seepage on the foundation pit structure is avoided, meanwhile, the closed structure has a strong waterproof effect, and the influence of water seepage on the building structure can be effectively avoided.
Drawings
FIG. 1 is a schematic top view of the present utility model;
FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view of B-B in FIG. 1;
FIG. 4 is a schematic cross-sectional view of C-C of FIG. 3;
fig. 5 is a schematic view of the structure of the water blocking tape of the present utility model.
Reference numerals: 1-retaining wall structure, 2-water collecting structure, 21-water collecting pipe, 22-upper water seepage pit, 23-communicating channel, 24-lower water seepage pit, 3-backfill structure, 31-reinforcing structure, 32-waterproof layer, 33-water blocking belt, 331-water blocking plate, 332-water blocking wall, 34-closed structure, 35-backfill, 4-water pumping structure, 41-water pumping system and 42-water pumping channel.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of this patent, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the patent and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and are therefore not to be construed as limiting the patent.
As shown in fig. 1, 2, 3 and 4, a waterproof drainage system for seepage of a side wall of a foundation pit comprises a retaining wall structure 1, a water collecting structure 2, a backfilling structure 3 and a water pumping structure 4, wherein the retaining wall structure 1 is arranged on the periphery of the seepage side wall of the foundation pit in a surrounding mode, a water retaining pit structure is formed by the retaining wall structure 1 and the side wall of the foundation pit, the backfilling structure 3 is arranged in the retaining wall structure 1, the water collecting structure 2 and the water pumping structure 4 are arranged in the backfilling structure 3, and the water pumping structure 4 is arranged in the water collecting structure 2.
A water blocking area is formed between a retaining wall structure 1 and a foundation pit, a closed seepage prevention structure is formed after a backfilling structure 3 is filled, water seepage of the foundation pit is collected through a water collecting structure 2 arranged in the backfilling structure 3 and is pumped out through a water pumping structure 4, and continuous seepage of the water seepage into a building is avoided.
As shown in fig. 2, the water collecting structure 2 includes a water seepage channel and a water collecting pipe 21, the water seepage channel includes an upper water seepage pit 22, a communicating 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 positioned below the upper water seepage pit 22, the upper water seepage pit 22 and the lower water seepage pit 24 are used for collecting water seepage of the water seepage area, the upper water seepage pit 22 is used for directly collecting water seepage, most of water seepage is collected, the water seepage leaked below is collected by the lower water seepage pit 24 to realize the collection of water seepage as much as possible, the water seepage is prevented from flowing along the side wall of the foundation pit, and the damage of the foundation pit and the seepage-proof structure is prevented; the water collecting pipe 21 is horizontally arranged at the bottom of the foundation pit and is positioned below the lower water seepage pit 24, the communication 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 collecting pipe 21, so that water seepage channels communicated with each other are formed, and the water collecting pipe 21 is communicated with the water pumping structure 4. The upper and lower water seepage pits 22 and 24 are used for collecting water seepage, the communication channel 23 is used for conveying the collected water seepage, and the water collecting pipe 21 serves as a water seepage concentration and discharge structure.
The upper seepage pit 22, the lower seepage pit 24 and the water collecting pipe 21 form a complete seepage collecting structure from top to bottom, the upper seepage pit 22 directly collects seepage in a seepage area and discharges the collected seepage into the water collecting pipe 21 along the communicating channel 23, the lower seepage pit 24 collects seepage leaking along the side wall of the foundation pit and then discharges the collected seepage into the water collecting pipe 21 along the communicating channel 23, and the seepage in the water collecting pipe 21 is discharged through the water pumping structure 4.
As shown in fig. 3, further, the pumping structure 4 includes a pumping system 41 and a pumping channel 42, the pumping channel 42 is vertically disposed in the backfill structure 3, the top of the pumping channel 42 penetrates out of the backfill structure 3 and is exposed, so as to communicate with the outside, the bottom of the pumping channel is located at the bottom of the foundation pit, one end of the water collecting structure 2 is located in the pumping channel 42, and a pumping port of the pumping system 41 is disposed at the bottom of the pumping channel 42.
As shown in fig. 2 and 3, further, the backfill structure 3 includes a reinforcing structure 31, a waterproof layer 32, a water blocking belt 33, a closed structure 34 and a backfill 35, the reinforcing structure 31 is arranged at the root of the side wall of the foundation pit at the water seepage point, the waterproof layer 32 is arranged at the bottom of the foundation pit between the retaining wall structure 1 and the side wall of the foundation pit, the water blocking belt 33 is arranged at the inner side of the retaining wall structure 1, the backfill 35 is arranged on the waterproof layer 32 and between the retaining wall structure 1 and the side wall of the foundation pit, the closed structure 34 is arranged at the top of the water blocking pit structure, and the edge of the closed structure 34 is connected with the side wall of the foundation pit, the water blocking belt 33 and the retaining wall structure 1.
The backfill structure 3 is used for filling and sealing the water blocking area, ensures that the water blocking area forms a stable sealing structure and can be used as a working surface for subsequent construction operation; and the waterproof and seepage-proofing and reinforcing functions are realized, and the whole water-proofing area is ensured to have enough structural stability and safety.
As shown in fig. 2, 3 and 4, the water blocking tape 33 further includes a water blocking plate 331 and a water blocking wall 332, the water blocking wall 332 is disposed 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, a lower portion of an outer side thereof is disposed on the inner side of the water blocking wall 332, an upper portion of an outer side thereof is disposed on the inner side of the retaining wall structure 1, and a top end of the water blocking plate 331 is connected with the closing structure 34 and the retaining wall structure 1.
The water blocking belt 33 is a vertically arranged U-shaped groove structure, seals the water blocking pit structure between the retaining wall structure 1 and the side wall of the foundation pit, plays a main water blocking role, prevents water seepage from penetrating into the building along the retaining wall structure 1, and supports the water blocking plate 331 by the water blocking wall 332 and the retaining wall structure 1, so that the water blocking plate 331 is kept stable.
As shown in fig. 5, further, the outer side plate of the water-blocking plate 331 is in a step shape and is attached to the step wall structure, the inner side edge of the water-blocking plate 331 is connected to the side wall of the foundation pit, and the left and right side edges of the water-blocking plate 331 are located at the left and right sides of the water-blocking pit structure.
As shown in fig. 2 and 3, the enclosed structure 34 further includes a leveling layer, an adhesive layer, and an enclosed layer, where the leveling layer, the adhesive layer, and the enclosed layer are disposed layer by layer from bottom to top, the leveling layer is disposed on the backfill 35, and the enclosed layer is connected with the retaining wall structure 1, the foundation pit, and the water blocking tape 33.
Further, the water-blocking plate 331 is a steel plate, the retaining wall structure 1 and the sealing layer are reinforced concrete structures, and the reinforcement cage of the sealing layer is connected with the water-blocking plate 331 and the reinforcement cage of the retaining wall structure 1.
Further, the water collecting pipe 21 is provided with a water inlet hole, and the bottom end of the communication channel 23 between the lower water seepage pit 24 and the water collecting pipe 21 is connected to the water inlet hole.
Preferably, the upper water seepage pit 22, the communication channel 23, the lower water seepage pit 24 and the water pumping channel 42 are all steel reinforcement cages, each steel reinforcement cage comprises a steel reinforcement framework and a steel reinforcement mesh, and the steel reinforcement mesh is laid on the outer side of the steel reinforcement framework.
Preferably, the reinforcement cages of the upper water seepage pit 22, the communication channel 23 and the lower water seepage pit 24 are welded into a cylindrical framework with the diameter of 200mm by adopting reinforcement bars with the diameter of 12mm, the reinforcement mesh is a reinforcement mesh with the aperture of not more than 1.5mm, the water pumping channel 42 is welded into a square reinforcement cage with the diameter of 500mm by adopting the diameter of 12mm, the length is determined according to the depth of a foundation pit, and the outside of the water pumping channel is wrapped with the reinforcement mesh with the aperture of not more than 1.5 mm.
Preferably, the reinforcing structure 31 is a sand bag, the waterproof layer 32 is waterproof cloth, the water-blocking plate 331 is a steel plate, the water-blocking wall 332 is piled up by fine soil, the leveling layer, the bonding layer and the sealing layer are respectively a fine sand leveling layer, a non-woven fabric layer and a reinforced concrete layer, and the backfill 35 is crushed stone with the grain size of 30-50 mm.
Preferably, the top end of the water-blocking plate 331 is fixedly connected with the framework of the sealing layer to form a whole, the bottom end of the water-blocking plate 331 is bent and extends into the lower part of the waterproof layer 32, the edge of the waterproof layer 32 is folded upwards and adhered to the inner wall of the water-blocking plate 331, the water-blocking pit structure is sealed, and the water-blocking effect of the water-blocking plate 331 is enhanced.
The construction method of the waterproof drainage system for seepage of the side wall of the foundation pit comprises the following construction steps:
s1, constructing a retaining wall structure: constructing the retaining wall structure 1 according to the operations of binding steel bars, supporting templates and pouring concrete, and reserving a structure connected with the closed structure 34;
s2, returning the reinforcing structure to the top: placing a reinforcing structure at the root of the side wall of the foundation pit, supporting the root of the foundation pit, and simultaneously manufacturing a water seepage channel and a water pumping channel 42;
s3, backfilling the bottom construction of the structure: firstly, paving a waterproof layer 32, paving a backfill 35 of a bottom layer to fix the waterproof layer 32, and then constructing a water blocking belt 33;
s4, constructing a water collecting structure: firstly, placing and fixing the water collecting pipe 21, then filling backfill 35 layer by layer, placing and fixing the upper water seepage pit 22 and the lower water seepage pit 24 at the designed positions during filling, and simultaneously connecting and fixing the communication channels 23;
s5, constructing a water pumping structure; in step S4, after the water collecting pipe 21 is placed and fixed, the combined water pumping channel 42 is vertically placed and connected with the water collecting pipe 21;
s6, backfilling construction of the upper part of the structure: filling backfill 35 to the top, then constructing a closed structure 34, and connecting the closed structure 34 with the retaining wall structure 1 to form an integrated structure;
s7, pumping operation: and pumping water according to the water seepage condition.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The waterproof drainage system for the side wall water seepage of the foundation pit is characterized by comprising a retaining wall structure (1), a water collecting structure (2), a backfill structure (3) and a water pumping structure (4), wherein the retaining wall structure (1) is arranged on the periphery of the side wall of the water seepage of the foundation pit in a surrounding mode, a water retaining pit structure is formed between the retaining wall structure and the side wall of the foundation pit, the backfill structure (3) is arranged in the retaining wall structure (1), the water collecting structure (2) and the water pumping structure (4) are arranged in the backfill structure (3), and the water pumping structure (4) is arranged in the water collecting structure (2);
the water collecting structure (2) comprises a water seepage channel and a water collecting pipe (21), the water seepage channel comprises an upper water seepage pit (22), a communicating channel (23) and a lower water seepage pit (24), the upper water seepage pit (22) is horizontally arranged at the upper part of a water seepage area, the lower water seepage pit (24) is horizontally arranged at the lower part of the water seepage area and is positioned below the upper water seepage pit (22), the water collecting pipe (21) is horizontally arranged at the bottom of a foundation pit and is positioned below the lower water seepage pit (24), the communicating 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 collecting pipe (21) to form a mutually communicated water seepage channel, and the water collecting pipe (21) is communicated with the water pumping structure (4);
the backfill structure (3) comprises a reinforcing structure (31), a waterproof layer (32), a water blocking belt (33), a closed structure (34) and backfill materials (35), wherein the reinforcing structure (31) is arranged at the root of the side wall of a foundation pit at a water seepage point, the waterproof layer (32) is arranged at the bottom of the foundation pit between the retaining wall structure (1) and the side wall of the foundation pit, the water blocking belt (33) is arranged at the inner side of the retaining wall structure (1), the backfill materials (35) are arranged on the waterproof layer (32) and are positioned between the retaining wall structure (1) and the side wall of the foundation pit, the closed structure (34) is arranged at the top of the water blocking pit structure, and the edge of the closed structure (34) is connected with the side wall of the foundation pit, the water blocking belt (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 step wall structure with the retaining wall structure (1), the water blocking plate (331) is of a U-shaped structure, the lower part of the outer side of the water blocking plate is positioned on the inner side of the water blocking wall (332), and the upper part of the outer side of the water blocking plate is positioned on the inner side of the retaining wall structure (1);
the bottom end of the water blocking plate (331) is positioned in the waterproof layer (32), and the top end of the water blocking plate (331) is connected with the closed structure (34) and the retaining wall structure (1).
2. A water resistant drainage system for use in foundation pit sidewall infiltration as claimed in claim 1, wherein: the water pumping structure (4) comprises a water pumping system (41) and a water pumping channel (42), the water pumping channel (42) is vertically arranged in the backfill structure (3), the top of the water pumping channel (42) penetrates out of the backfill structure (3) and is exposed, the bottom of the water pumping channel is positioned at the bottom of a foundation pit, one end of the water collecting structure (2) is positioned in the water pumping channel (42), and a water pumping port of the water pumping system (41) is arranged at the bottom of the water pumping channel (42).
3. A water resistant drainage system for use in foundation pit sidewall infiltration as claimed in claim 1, wherein: the outer side plate of the water blocking plate (331) is in a step-shaped structure and is attached to the step wall structure, the inner side edge of the water blocking plate (331) is connected to the side wall of the foundation pit, and the left side edge and the right side edge of the water blocking plate (331) are located on the left side and the right side of the water blocking pit structure.
4. A water resistant drainage system for use in foundation pit sidewall infiltration as claimed in claim 1, wherein: the sealing structure (34) comprises a leveling layer, an adhesive layer and a sealing layer, wherein the leveling layer, the adhesive layer and the sealing layer are arranged layer by layer from bottom to top, the leveling layer is arranged on a backfill (35), and the sealing layer is connected with the retaining wall structure (1), the foundation pit and the water blocking belt (33).
5. A water resistant drainage system for use in foundation pit sidewall infiltration as claimed in claim 4, wherein: the water blocking plate (331) is a steel plate, the retaining wall structure (1) and the sealing layer are of reinforced concrete structures, and the reinforcement cage of the sealing layer is connected with the water blocking plate (331) and the reinforcement cage of the retaining wall structure (1).
6. A water resistant drainage system for use in foundation pit sidewall infiltration as claimed in claim 4, wherein: the water collecting pipe (21) is provided with a water inlet hole, and the bottom end of a communication channel (23) positioned between the lower water seepage pit (24) and the water collecting pipe (21) is connected in the water inlet hole.
7. A water resistant drainage system for use in foundation pit sidewall infiltration as claimed in claim 2, wherein: the upper water seepage pit (22), the communication channel (23), the lower water seepage pit (24) and the water pumping channel (42) are steel reinforcement cages, each steel reinforcement cage comprises a steel reinforcement framework and a steel reinforcement mesh, and the steel reinforcement mesh is laid on the outer side of the steel reinforcement framework.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320866149.2U CN219261044U (en) | 2023-04-18 | 2023-04-18 | Waterproof drainage system for seepage of side wall of foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320866149.2U CN219261044U (en) | 2023-04-18 | 2023-04-18 | Waterproof drainage system for seepage of side wall of foundation pit |
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| CN219261044U true CN219261044U (en) | 2023-06-27 |
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| CN202320866149.2U Active CN219261044U (en) | 2023-04-18 | 2023-04-18 | Waterproof drainage system for seepage of side wall of foundation pit |
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| CN (1) | CN219261044U (en) |
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2023
- 2023-04-18 CN CN202320866149.2U patent/CN219261044U/en active Active
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