CN219710364U - Pit-in-pit dewatering system in foundation pit - Google Patents
Pit-in-pit dewatering system in foundation pit Download PDFInfo
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- CN219710364U CN219710364U CN202321080973.1U CN202321080973U CN219710364U CN 219710364 U CN219710364 U CN 219710364U CN 202321080973 U CN202321080973 U CN 202321080973U CN 219710364 U CN219710364 U CN 219710364U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 175
- 239000010865 sewage Substances 0.000 claims abstract description 43
- 239000004575 stone Substances 0.000 claims abstract description 37
- 238000001914 filtration Methods 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 4
- 239000003673 groundwater Substances 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 239000002349 well water Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000004078 waterproofing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Abstract
The utility model provides a pit-in-pit dewatering system in a foundation pit, which belongs to the technical field of foundation pit dewatering and comprises a plurality of water collecting wells, a pipe-under-broken stone cushion layer, a drainage pipe network and a pipe-over-broken stone cushion layer, wherein the water collecting wells are all arranged at the end corners of the pit-in-pit, a sewage pump is arranged in the water collecting wells, the water outlet ends of the sewage pump are communicated with a sewage pipe, and the pipe-under-broken stone cushion layer is paved at the bottom of the pit-in-pit; the drainage pipe network is arranged on the upper end face of the under-pipe gravel cushion layer and used for collecting underground water in the pit, the drainage pipe network is communicated with the water collecting wells, and the under-pipe gravel cushion layer is paved on the upper end of the under-pipe gravel cushion layer. The pit-in-pit dewatering system provided by the utility model has the technical effects of improving the dewatering speed, ensuring that the construction is completed in a dry environment, not influencing the construction and ensuring the construction progress and quality.
Description
Technical Field
The utility model belongs to the technical field of foundation pit dewatering, and particularly relates to a pit-in-pit dewatering system in a foundation pit.
Background
The foundation slab of the large building is generally provided with structures such as an elevator shaft, a water collecting tank and the like, the areas of the structures are not large, but the elevation of the foundation bottom is more lower than that of the main body structure by about 1.0-3.0m, and a pit in pit is formed when a foundation pit is excavated. The water level drop depth of the foundation pit dewatering design is kept 0.5m below the elevation of the bottom of the main structure, and if the water level drop depth is extended to 0.5m below the bottom of the pit in the pit, the water level drop depth is increased by 1.0-3.0m, so that the dewatering cost is increased greatly.
At present, when a pit in pit is arranged in a foundation pit, the precipitation of the pit in pit mostly adopts methods such as open drainage at the bottom of the foundation pit or light well points, and the like, as in the prior art, the patent application number is 202211734613.9, and a deep foundation pit dewatering construction method is disclosed, wherein the precipitation in an open drainage mode is disclosed. However, in the foundation pit of the water-rich stratum, the underground water quantity is rich, the dewatering speed of the open-row or light well point method is low, the effect is poor, the completion of foundation waterproofing, reinforcement binding, concrete pouring and other works in the pit can not be ensured in a dry environment, hidden danger is brought to the construction quality, and the construction period is prolonged. Therefore, there is a need for improvement in precipitation of pits in pits to ensure construction progress and quality.
Disclosure of Invention
The utility model aims to provide a pit-in-pit dewatering system in a foundation pit, and aims to solve the technical problem that when the pit-in-pit is arranged in the foundation pit, the drainage speed is low by adopting an open drainage or light well point mode for enriching the underground water quantity, and the construction is influenced.
In order to achieve the above purpose, the utility model adopts the following technical scheme: provided is a pit-in-pit dewatering system in a foundation pit, comprising:
the water collecting wells are arranged at the end corners of the pits in the pits, a sewage pump is arranged in each water collecting well, the water outlet ends of the sewage pumps are communicated with sewage pipes, the water outlet ends of the sewage pipes are positioned outside the pits in the pits, and the sewage pump is used for sucking underground water flowing into the water collecting wells and discharging the underground water to the outside of the pits in the pits through the sewage pipes;
the under-pipe broken stone cushion layer is paved at the bottom of the pit;
the drainage pipe network is arranged on the upper end face of the under-pipe crushed stone cushion layer and used for collecting underground water in the pit, the drainage pipe network is communicated with the water collecting wells, a first water permeable hole is formed in the drainage pipe network, and the underground water is collected into the drainage pipe network through the first water permeable hole and flows into the water collecting wells;
and the pipe-mounted broken stone cushion layer is laid at the upper end of the pipe-mounted broken stone cushion layer and covers the drainage pipe network.
In one possible implementation, when pouring the bottom plate of the main body structure, a closed pit is arranged at the upper end face of the bottom plate, and the sewage pipe passes through the closed pit and is led out from the upper end of the closed pit.
In one possible implementation, the drainage pipe network includes:
four main drainage pipes which are mutually communicated to form a rectangle, are arranged at the bottom in the pit and are communicated with the water collecting well, and groundwater is collected into the main drainage pipes and flows into the water collecting well;
the drainage branch pipes are arranged in parallel inside a rectangular structure surrounded by the four drainage main pipes, two ends of each drainage branch pipe are communicated with the drainage main pipe, water flowing into the drainage branch pipe is collected into the drainage main pipe, water in the drainage main pipe is collected and flows into the water collecting well, the first water permeable holes are formed in the drainage main pipe and the drainage branch pipes, and water flows into the drainage main pipe and the drainage branch pipes through the first water permeable holes.
In one possible implementation manner, the number of the first water permeable holes is multiple, the first water permeable holes are arranged at intervals along the length direction of the main drainage pipe and the branch drainage pipe, the diameter of each first water permeable hole is 5-8mm, and the distance between the first water permeable holes is 20-30cm.
In one possible implementation, the drainage main pipe and the drainage branch pipe are both wrapped with a first water filtering net, and the first water filtering net is a 60-80 mesh nylon net.
In one possible implementation manner, the water collecting well is closed at the lower end and open at the upper end, a second water permeable hole is formed in the water collecting well and below the broken stone cushion layer on the pipe, and a second water filtering net is wrapped in the water collecting well, and water flows into the water collecting well through the second water filtering net and the second water permeable hole.
In one possible implementation, the water collection well bottom elevation is no less than 30cm below the pit bottom elevation of the pit in the pit.
In one possible implementation, the water collection well is made of steel tubing with an inner diameter that is larger than the outer diameter of the sewage pump.
In one possible implementation, the under-tube gravel cushion and the on-tube gravel cushion are both paved with gravel, which is 5-25mm continuous graded gravel.
In one possible implementation, the under-tube ballast bed is 10cm thick and the over-tube ballast bed is 20cm thick.
The pit-in-pit dewatering system in the foundation pit has the beneficial effects that: compared with the prior art, the pit-in-pit dewatering system in the foundation pit comprises a plurality of water collecting wells, a pipe-under-broken stone cushion layer, a drainage pipe network, a pipe-on-broken stone cushion layer and a concrete cushion layer, wherein the water collecting wells are arranged at the end corners of the pit-in-pit, a sewage pump is arranged in each water collecting well, the water outlet ends of the sewage pumps are communicated with a sewage pipe, the water outlet ends of the sewage pipes are positioned outside the pit-in-pit, and the sewage pump is used for sucking underground water flowing into the water collecting wells and discharging the underground water to the outside of the pit-in-pit through the sewage pipe; the under-pipe broken stone cushion layer is laid at the bottom of the pit; the drainage pipe network is arranged on the upper end surface of the under-pipe crushed stone cushion layer and is used for collecting underground water in the pit, the drainage pipe network is communicated with the plurality of water collecting wells, the drainage pipe network is provided with first water permeable holes, and the underground water is collected into the drainage pipe network through the first water permeable holes and flows into the plurality of water collecting wells; the pipe-mounted broken stone cushion layer is laid at the upper end of the pipe-mounted broken stone cushion layer and covers a drainage pipe network, so that the technical problem that construction is influenced due to the fact that pit dewatering in a pit adopts a clear drainage mode or a light well point mode is low in drainage speed is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a pit-in-pit dewatering system in a foundation pit according to an embodiment of the present utility model;
FIG. 2 is a plan view of a drainage pipe network layout structure of a pit-in-pit dewatering system in a foundation pit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a local structure of a drainage pipe network of a pit-in-pit dewatering system in a foundation pit according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a water collection well; 2. a rubble bedding layer under the pipe; 3. a drainage pipe network; 31. a first water permeable hole; 32. a drainage main pipe; 33. a water discharge branch pipe; 34. a first water filter screen; 4. a broken stone cushion layer is arranged on the pipe; 5. a concrete cushion layer; 6. pit in pit; 7. a sewage pump; 8. a sewage pipe; 9. a main body structure base plate; 91. closing the pit; 10. a base foundation soil; 11. pit-in-pit slope roof line; 12. pit-in-pit slope bottom line.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1 to 3, a description will now be given of a pit-in-pit dewatering system in a foundation pit according to the present utility model. The pit-in-pit dewatering system in the foundation pit comprises a plurality of water collecting wells 1, a lower crushed stone cushion layer 2, a drainage pipe network 3, an upper crushed stone cushion layer 4 and a concrete cushion layer 5, wherein the water collecting wells 1 are arranged at the end corners of the pit-in-pit 6, a sewage pump 7 is arranged in the water collecting well 1, the water outlet end of the sewage pump 7 is communicated with a sewage pipe 8, the water outlet end of the sewage pipe 8 is positioned outside the pit-in-pit 6, and the sewage pump 7 is used for sucking underground water flowing into the water collecting well 1 and discharging the underground water to the outside of the pit-in-pit 6 through the sewage pipe 8; the under-pipe crushed stone cushion layer 2 is paved at the bottom of the pit in the pit 6; the drainage pipe network 3 is arranged on the upper end surface of the under-pipe crushed stone cushion layer 2 and is used for collecting underground water in the pit 6 in the pit, the drainage pipe network 3 is communicated with the plurality of water collecting wells 1, the drainage pipe network 3 is provided with first water permeable holes 31, and the underground water is collected into the drainage pipe network 3 through the first water permeable holes 31 and flows into the plurality of water collecting wells 1; the upper pipe broken stone cushion layer 4 is laid on the upper end of the lower pipe broken stone cushion layer 2 and covers the drainage pipe network 3.
Compared with the prior art, the pit-in-pit dewatering system in the foundation pit provided by the utility model has the advantages that the plurality of water collecting wells 1 are arranged, the underground water in the pit 6 can be collected and discharged into the water collecting wells 1 by arranging the drainage pipe network 3, the drainage speed of the underground water in the pit 6 is high, and the drainage speed is obviously superior to that of the foundation pit by using an open drainage or light well point method, so that the working such as foundation waterproofing, reinforcement binding and concrete pouring are not influenced, the technical problem that the drainage speed of the pit 6 in the pit is slow by adopting the open drainage or light well point method and the construction is influenced is solved, the dewatering speed can be improved, the construction is ensured to be completed in a dry environment, the construction progress and the quality are not influenced, and the technical effect of the construction progress and quality is ensured.
In the embodiment, a concrete cushion layer 5 is paved at the upper end of a broken stone cushion layer 4 on a pipe, and paved to the top of a slope along a slope of a pit 6 in a pit, wherein the elevation of the upper end surface of the concrete cushion layer 5 is lower than the elevation of the upper end of a water collecting well 1; the main structure bottom plate 9 is arranged at the upper end of the concrete cushion layer 5. The main body structure base plate 9 refers to a base plate of a main body structure in the related art. Neither the concrete cushion 5 nor the main structure floor 9 belongs to the precipitation system of the utility model.
In this embodiment, the upper and lower pipe breaker mats 4 and 2 are compacted and leveled by a suitable method. And when the underground water level in the pit 6 in the pit falls below the top surface of the pipe upper broken stone cushion layer 4, pouring the concrete cushion layer 5, wherein the strength grade and the thickness of the concrete cushion layer 5 are constructed according to the design requirements. In the construction process, the sewage pump 7 is in an operating state, so that the groundwater level in the pit 6 is kept below the top surface of the under-pipe gravel cushion layer 2. When the broken stone cushion layer 4 is paved on the pipe, the elevation of the top surface of the broken stone cushion layer is ensured to be the same as the elevation of the bottom surface of the concrete cushion layer 5. The bottom in fig. 1 is the base foundation soil 10. In fig. 2, the outer frame represents the pit-in-pit slope roof line 11, and the inner frame represents the pit-in-pit bottom line 12.
In the embodiment, the excavation depth of the pit in the pit 6 exceeds the designed bottom elevation of the pit in the pit 6 by not less than 30cm, the slope gradient is set according to the excavation depth by 1:0.75-1:1.5, and the excavation depth takes a large value when the excavation depth is large.
In some embodiments, referring to fig. 1 to 3, when the main body structure bottom plate 9 is cast, a closed pit 91 is provided at an upper end surface thereof, and the sewage pipe 8 passes through the closed pit 91 and is led out from an upper end of the closed pit 91. The function of the closed pit 91 is: after no water exists in the water collecting well 1, stopping pumping water by the sewage pump 7, injecting cement slurry into the water collecting well 1 through the sewage pipe 8, cutting off the sewage pipe 8 at the bottom of the closed pit 91, plugging the pipe orifice of the sewage pipe 8 by a wood plug, pouring the closed pit 91 by concrete with the same strength grade as the concrete used by the main structure bottom plate 9, and filling up to finish construction. This enables precipitation of pit 6 in the pit.
In particular, the closed pit 91 has a cubic shape, facilitating the passage of the sewer pipe 8 from the bottom thereof. In this embodiment, the main body structure bottom plate 9 is made by concrete casting, and one or more closed pits 91 are reserved when casting the concrete.
In some embodiments, referring to fig. 1 to 3, the drainage pipe network 3 includes four drainage main pipes 32 and a plurality of drainage branch pipes 33, the four drainage main pipes 32 are mutually communicated to form a rectangle, and are placed at the bottom in the pit 6 and are communicated with the water collecting well 1, and groundwater flows into the water collecting well 1 after entering the drainage main pipes 32; the drainage branch pipes 33 are all arranged in parallel inside a rectangular structure surrounded by the drainage main pipes 32, two ends of each drainage branch pipe 33 are all communicated with the drainage main pipe 32, water flowing into the drainage branch pipe 33 is collected into the drainage main pipe 32, water in the drainage main pipe 32 is collected into the water collecting well 1, the first water permeable holes 31 are all formed in the drainage main pipe 32 and the drainage branch pipes 33, and water flows into the drainage main pipe 32 and the drainage branch pipes 33 through the first water permeable holes 31. The water discharge branch pipes 33 are distributed at intervals of 1.0-2.0m, the diameter of the water discharge main pipe 32 is larger than that of the water discharge branch pipes 33, and the end part of the water discharge main pipe 32 extends into the water collecting well 1. The main drainage pipe 32 and the branch drainage pipe 33 are made of PE, PVC and other pipes.
In some embodiments, referring to fig. 1 to 3, the plurality of first water permeable holes 31 are arranged at intervals along the length direction of the main drain pipe 32 and the branch drain pipe 33, the diameter of the first water permeable holes 31 is 5-8mm, and the interval between the first water permeable holes 31 is 20-30cm.
In some embodiments, referring to fig. 1 to 3, the drain main pipe 32 and the drain branch pipe 33 are both wrapped with a first water filtering net 34, and the first water filtering net 34 is a 60-80 mesh nylon net.
In some embodiments, referring to fig. 1 to 3, the water collecting well 1 has a closed lower end and an open upper end, and a second water filtering net (not shown in the drawings, the structure of which is similar to the first water filtering net 34 and the first water filtering net 31) is wrapped around the water collecting well 1 and disposed on the water collecting well 1 and below the on-pipe crushed stone cushion layer 4, and water flows into the water collecting well 1 through the second water filtering net and the second water filtering net. The reason why the bottom of the water collection well 1 is closed is to prevent the bottom sediment from flowing into the well. Before pouring the concrete of the main structure bottom plate 9, an annular steel plate (not shown in the figure) is used for sealing the upper end of the water collecting well 1, the middle part of the annular steel plate is a circular hole, the sewage pipe 8 can pass through, and the annular steel plate is arranged to prevent the concrete from falling into the water collecting well 1.
In some embodiments, referring to fig. 1 to 3, the bottom level of the water collection well 1 is not less than 30cm below the bottom level of the pit 6.
In some embodiments, referring to fig. 1 to 3, the water collection well 1 is made of steel pipe, and the inner diameter of the water collection well is larger than the outer diameter of the sewage pump 7.
In some embodiments, referring to fig. 1-3, the under-pipe gravel bed 2 and the on-pipe gravel bed 4 are each paved with gravel, which is 5-25mm continuous graded gravel. The graded broken stone is good, permeable, convenient and compact.
In some embodiments, referring to fig. 1-3, the under-tube ballast bed 2 is 10cm thick and the on-tube ballast bed 4 is 20cm thick.
The sewage pump 7 in this embodiment is in a state of continuously pumping water, specifically, in a period from the completion of the on-pipe gravel cushion layer 4 to the design strength of the concrete strength of the main structure bottom plate 9, the sewage pump 7 is required to keep continuous pumping water continuously, and the underground water level in the pit is kept below the top surface of the under-pipe gravel cushion layer 2, so as to prevent the concrete cushion layer 5 from being damaged by the underground water pressure.
According to the utility model, the drainage pipe network 3, the upper broken stone cushion layer 4, the lower broken stone cushion layer 2 and the collector well 1 are arranged at the bottom of the pit 6 in the foundation pit, so that the underground water of the pit 6 in the pit is discharged out of the pit, the completion of the works such as foundation waterproofing, steel bar binding and concrete pouring in a dry environment is ensured, the difficult problem of precipitation of the pit 6 in the foundation pit in the water-rich stratum is solved, and the precipitation effect is effectively ensured. When the foundation slab is waterproof, steel bar binding and concrete pouring work are carried out, the sewage pump 7 in the water collecting well 1 is used for pumping water continuously, the underground water level in the pit 6 is kept below the concrete cushion layer 5, the concrete cushion layer 5 and the foundation waterproof layer are effectively prevented from being damaged due to the pressure of the underground water, and the construction quality is effectively guaranteed.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. Pit-in-pit dewatering system in foundation pit, characterized by comprising:
the water collecting wells are arranged at the end corners of the pits in the pits, a sewage pump is arranged in each water collecting well, the water outlet ends of the sewage pumps are communicated with sewage pipes, the water outlet ends of the sewage pipes are positioned outside the pits in the pits, and the sewage pump is used for sucking underground water flowing into the water collecting wells and discharging the underground water to the outside of the pits in the pits through the sewage pipes;
the under-pipe broken stone cushion layer is paved at the bottom of the pit;
the drainage pipe network is arranged on the upper end face of the under-pipe crushed stone cushion layer and used for collecting underground water in the pit, the drainage pipe network is communicated with the water collecting wells, a first water permeable hole is formed in the drainage pipe network, and the underground water is collected into the drainage pipe network through the first water permeable hole and flows into the water collecting wells;
and the pipe-mounted broken stone cushion layer is laid at the upper end of the pipe-mounted broken stone cushion layer and covers the drainage pipe network.
2. A pit-in-pit dewatering system according to claim 1, wherein the upper end surface of the foundation pit is provided with a closed pit when the bottom plate of the main structure is poured, and the sewer pipe passes through the closed pit and is led out from the upper end of the closed pit.
3. The pit-in-pit dewatering system of claim 1, wherein the drainage network comprises:
four main drainage pipes which are mutually communicated to form a rectangle, are arranged at the bottom in the pit and are communicated with the water collecting well, and groundwater is collected into the main drainage pipes and flows into the water collecting well;
the drainage branch pipes are arranged in parallel inside a rectangular structure surrounded by the four drainage main pipes, two ends of each drainage branch pipe are communicated with the drainage main pipe, water flowing into the drainage branch pipe is collected into the drainage main pipe, water in the drainage main pipe is collected and flows into the water collecting well, the first water permeable holes are formed in the drainage main pipe and the drainage branch pipes, and water flows into the drainage main pipe and the drainage branch pipes through the first water permeable holes.
4. A pit-in-pit dewatering system according to claim 3, wherein the number of first water permeable holes is plural, the first water permeable holes are arranged at intervals along the length direction of the main drainage pipe and the branch drainage pipe, the diameter of the first water permeable holes is 5-8mm, and the distance between the first water permeable holes is 20-30cm.
5. A pit-in-pit dewatering system according to claim 3, wherein the outer parts of the main drainage pipe and the branch drainage pipe are respectively wrapped with a first water filtering net, and the first water filtering net is a 60-80 mesh nylon net.
6. The pit-in-pit dewatering system of claim 1, wherein the water collecting well has a closed lower end and an open upper end, a second water permeable hole is formed in the water collecting well and below the crushed stone bedding layer on the pipe, and a second water filtering net is wrapped around the water collecting well, and water flows into the water collecting well through the second water filtering net and the second water permeable hole.
7. A pit-in-pit dewatering system according to claim 1, wherein the pit bottom elevation of the water collection well is no less than 30cm below the pit bottom elevation of the pit-in-pit.
8. A pit-in-pit dewatering system according to claim 1, wherein the water collection well is made of steel pipe having an inner diameter greater than the outer diameter of the sewage pump.
9. The pit-in-pit dewatering system of claim 1, wherein the under-pipe gravel cushion layer and the on-pipe gravel cushion layer are formed by paving broken stones, and the broken stones are continuous graded broken stones of 5-25 mm.
10. A pit-in-pit dewatering system according to claim 1, wherein the undermine ballast bed is 10cm thick and the overhead ballast bed is 20cm thick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321080973.1U CN219710364U (en) | 2023-05-08 | 2023-05-08 | Pit-in-pit dewatering system in foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321080973.1U CN219710364U (en) | 2023-05-08 | 2023-05-08 | Pit-in-pit dewatering system in foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219710364U true CN219710364U (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321080973.1U Active CN219710364U (en) | 2023-05-08 | 2023-05-08 | Pit-in-pit dewatering system in foundation pit |
Country Status (1)
| Country | Link |
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| CN (1) | CN219710364U (en) |
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2023
- 2023-05-08 CN CN202321080973.1U patent/CN219710364U/en active Active
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