CN112095647A - Plugging method for quickly plugging leakage point of waterproof curtain - Google Patents
Plugging method for quickly plugging leakage point of waterproof curtain Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0023—Slurry
Abstract
The invention provides a plugging method for quickly plugging a leakage point of a waterproof curtain, which comprises the following steps: s1, leakage finding, S2, security inspection and equipment installation, S3, leakage point checking, S4, secondary leakage stoppage and S5, leakage stoppage effect checking. Through the mode, the problems of poor leakage stopping effect, low construction efficiency and energy saving of the existing chemical grouting and compaction grouting process are solved.
Description
Technical Field
The invention relates to the technical field of foundation pit leakage stoppage, in particular to a leakage stoppage method for quickly blocking leakage points of a waterproof curtain.
Background
Along with the continuous acceleration of the urbanization process in China, the reasonable development and utilization of underground space are the requirements of the sustainable development of cities, the scale of various foundation pits is continuously enlarged and deepened, and therefore the problem of foundation pit leakage is more and more. The leakage and piping of the foundation pit can bring great influence to the safety of the foundation pit.
At present, the enclosure forms of foundation pit water stop mainly comprise steel sheet piles, secant piles, stirring piles, high-pressure jet grouting piles, underground continuous walls and the like. The stirring pile is widely applied by the advantages of wide application range, convenient construction, good water stopping effect and lower cost. Due to the diversity and uncertainty of geological conditions and the difference of technical levels of the mixing pile construction team and group, the problem of water leakage often occurs after foundation pit excavation.
The conventional method for treating the foundation pit leakage at present comprises the following steps: firstly, a chemical grouting method; and secondly, a compaction grouting leakage stoppage method.
The conventional method for treating the foundation pit leakage mainly has the following problems: the chemical grouting method can utilize a chemical expanding agent to perform grouting treatment on small leakage and crack leakage, but cannot treat large leakage and even sand gushing water burst chemical grouting; the second, the pressure grouting leaking stoppage method mainly lies in that the leakage point is difficult to find, and meanwhile, because the injection amount pressure of the pressure grouting is small, the volume is small, and the effective large-area leaking stoppage body cannot be formed in time, so that the pressure grouting leaking stoppage efficiency is poor, and the large leakage point cannot be controlled effectively, and the leaking stoppage is failed.
Disclosure of Invention
In order to solve the problems, the invention provides a plugging method for quickly plugging a leakage point of a waterproof curtain, which can solve the problems of poor plugging effect, low construction efficiency and energy saving of the existing chemical grouting and compaction grouting processes.
The main content of the invention comprises: a plugging method for quickly plugging leakage points of a waterproof curtain comprises the following steps:
s1, leakage finding: when the waterproof curtain is found to have a leakage problem, the leakage position is stabilized by back pressure backfill;
s2, security inspection and equipment installation: installing leakage blocking equipment above a foundation pit leakage position, wherein the leakage blocking equipment comprises a drilling machine, a drilling rod and a pile machine background, the drilling machine is horizontally arranged, the drilling rod is vertically aligned with a drilling central line, the pile machine background comprises a slurry pipeline and a water channel which are arranged in parallel, and the slurry pipeline is used for providing cement slurry; the water path is used for providing water and water glass; a water conveying outer pipe for conveying water glass or water and a slurry conveying inner pipe for conveying cement slurry are arranged in the drill rod;
s3, troubleshooting missing points: drilling holes in the periphery of the waterproof curtain by adopting leakage stopping equipment, then injecting cement slurry with a water-cement ratio of 1.0-1.2 into the inner pipe, wherein the grouting pressure is 3-5 MPa, injecting clean water into the outer pipe at the same time, and determining a leakage point according to the leakage position of the cement slurry, wherein the water injection pressure value is 1 MPa;
s4, secondary plugging: drilling a drill rod to a position 2-3m below a leakage point of a foundation pit, performing secondary high-pressure double-liquid rotary spraying grouting by adopting a double-pipe method, wherein the grouting direction is from bottom to top, the grouting drilling speed is 5-10 cm/min, cement slurry with the water-cement ratio of 0.5-0.7 is injected into an inner pipe, water glass is simultaneously injected into an outer pipe, and the injection pressure of the water glass pipe is 5 MPa;
wherein, the process of the first grouting comprises the following steps: grouting under the pressure of 15-25 MPa, performing fixed spraying for 1-2 min when a grouting pipe reaches the leakage depth, stopping for 2-5 min after grouting, fully mixing grout with a peripheral soil body, and performing primary hardening molding to form a hardened plugging body;
the second grouting process comprises the following steps: after the first grouting pause is finished, performing second grouting at the grouting pressure of 25-35 MPa to densely fill small pores in the hardened plugging body to form a denser plugging body;
s5, checking the plugging effect: after grouting for 36-48 hours, soil body cut is inspected to stop water effect: when the original leakage point does not leak any more, the leakage stoppage is finished; and when micro-seepage exists at the original leakage point, repeating the steps S3 and S4 to perform secondary leakage stopping until the micro-seepage stops.
Preferably, the mud line comprises: the slurry mixing device comprises a cement bin, a clear water tank A, a slurry mixer, a paddle barrel and a high-pressure slurry pump, wherein the cement bin and the clear water tank A are respectively connected to the slurry mixer, the slurry mixer is connected to the paddle barrel, and the high-pressure slurry pump is arranged between the paddle barrel and a drill rod; the waterway includes: the device comprises a clean water tank B and a water glass tank, wherein the clean water tank B is connected with the water glass tank in parallel, a three-way valve is arranged between the clean water tank B and the water glass tank, a first interface of the three-way valve is connected with the clean water tank B, a second interface of the three-way valve is connected with the water glass tank, and a third interface of the three-way valve is connected to a drill rod through a high-pressure water pump.
Preferably, the bottom of the inner slurry conveying pipe and the bottom of the outer water conveying pipe are both provided with nozzles, the nozzles of the inner slurry conveying pipe and the nozzles of the outer water conveying pipe are arranged in a staggered mode, and the diameter of each nozzle is 3.5-5 mm.
Preferably, the pile machine background is connected with the drill rod through a high-pressure hose, and the joints between the pile machine background and the high-pressure hose and the joints between the drill rod and the high-pressure hose are all bayonet joints.
Preferably, a sealing ring is arranged at the snap-in joint.
Preferably, the water glass is one or more of sodium water glass or potassium water glass.
Preferably, the cement slurry is ordinary portland cement.
The invention has the beneficial effects that:
1. the existing conventional leakage stopping measures are improved, so that the leakage stopping efficiency is greatly improved, and the safety problem of the enclosure structure caused by leakage is reduced;
2. the diameter of a drill nozzle is improved, so that the leaking stoppage area and efficiency are greatly improved, and the conditions of large leakage and water and sand gushing which cannot be treated by the conventional leaking stoppage technology can be effectively treated;
3. the diameter of the nozzle of the inner pipe and the outer pipe of the drill bit of the dual rotary jet pile machine is improved and is adjusted to 3.5-5 mm from the conventional 1.8mm, so that the problem that the nozzle is easy to block is solved, water glass and cement slurry can be mixed more quickly and effectively, a leaking stoppage body is formed quickly, a water outlet channel is sealed, and the leaking stoppage efficiency is improved remarkably;
4. the background of the dual rotary jet pile machine is integrated and improved, so that the background becomes an effective and unified background and a reliable and efficient plugging treatment template is provided for foundation pit plugging.
Drawings
FIG. 1 is a schematic structural diagram of a jet grouting leakage detection process in a preferred embodiment of the method for rapidly plugging leakage points of a waterproof curtain of the present invention;
FIG. 2 is a schematic structural view of a fixed-flow plugging process according to the present invention;
FIG. 3 is an enlarged view of part A of FIG. 1;
reference numerals: 1. the device comprises a drilling machine 2, a drill rod 3, a pile machine background 4, a waterproof curtain 5, a hardened plugging body 21, a slurry conveying inner pipe 22, a water conveying outer pipe 23, an outer pipe nozzle 24, an inner pipe nozzle 31, a high-pressure slurry pump 32, a slurry barrel 33, a slurry stirrer 34, a clean water tank A, a clean water tank 35, a cement bin 36, a high-pressure water pump 37, a three-way pipe 38, a water glass tank 39 and a clean water tank B.
Detailed Description
The technical scheme protected by the invention is specifically explained in the following by combining the attached drawings.
Example 1
A plugging method for quickly plugging leakage points of a waterproof curtain comprises the following steps:
s1, leakage finding: when the waterproof curtain is found to have a leakage problem, the leakage position is stabilized by back pressure backfill;
s2, security inspection and equipment installation: installing leakage blocking equipment above a foundation pit leakage position, wherein the leakage blocking equipment comprises a drilling machine, a drilling rod and a pile machine background, the drilling machine is horizontally arranged, the drilling rod is vertically aligned with a drilling center line, the inclination of the drilling rod is not more than 1.5%, the pile machine background comprises a slurry pipeline and a water channel which are arranged in parallel, and the slurry pipeline is used for providing cement slurry; the water path is used for providing water and water glass; a water conveying outer pipe for conveying water glass or water and a slurry conveying inner pipe for conveying cement slurry are arranged in the drill rod; and (4) before construction, checking grouting equipment and a pipeline system, debugging, and adjusting according to the condition of a test pile during construction. The sealing ring of the pipeline system is required to be good, sundries cannot be left in each channel and each nozzle, the measuring instrument is qualified in inspection, and the slurry suction hose is required to be an armored rubber pipe in a verification period;
s3, troubleshooting missing points: drilling holes at the periphery of the waterproof curtain by adopting leakage stopping equipment, carefully measuring and recording actual hole positions, hole depths and stratum change conditions in the drilling process, then injecting cement slurry with a water-cement ratio of 1.0 into the inner pipe, wherein the grouting pressure is 3MPa, simultaneously injecting clear water into the outer pipe, the water injection pressure value is 1MPa, and determining a leakage point according to the leakage position of the cement slurry;
s4, secondary plugging: drilling a drill rod to a position 2m below a leakage point of a foundation pit, performing secondary high-pressure double-liquid rotary jet grouting by adopting a double-pipe method, wherein the grouting direction is from bottom to top, the grouting drilling speed is 5cm/min, cement slurry with the water-cement ratio of 0.5 is injected into an inner pipe, water glass is simultaneously injected into an outer pipe, and the injection pressure of a water glass pipe is 5 MPa;
wherein, the process of the first grouting comprises the following steps: grouting under the pressure of 15MPa, performing fixed spraying for 1min when a grouting pipe reaches the leakage depth, stopping for 2min after grouting is finished, fully mixing grout with a peripheral soil body, and performing primary hardening and forming to form a hardened plugging body;
the second grouting process comprises the following steps: after the first grouting pause is finished, performing second grouting at the grouting pressure of 25MPa to densely fill small pores in the hardened plugging body to form a denser plugging body;
s5, checking the plugging effect: after grouting for 36 hours, soil body cut is inspected to stop water effect: when the original leakage point does not leak any more, the leakage stoppage is finished; and when micro-seepage exists at the original leakage point, repeating the steps S3 and S4 to perform secondary leakage stopping until the micro-seepage stops.
Furthermore, the slurry must be stirred after various machines and tools run normally, measures should be taken in the slurry preparation process to prevent the slurry from precipitating, and meanwhile, the mixing ratio of the water glass and the cement slurry is prepared on site to meet the quick setting requirement, and the slurry is prepared for use immediately to prevent solidification.
Further, the mud line includes: the slurry mixing device comprises a cement bin, a clear water tank A, a slurry mixer, a paddle barrel and a high-pressure slurry pump, wherein the cement bin and the clear water tank A are respectively connected to the slurry mixer, the slurry mixer is connected to the paddle barrel, and the high-pressure slurry pump is arranged between the paddle barrel and a drill rod; the waterway includes: the device comprises a clean water tank B and a water glass tank, wherein the clean water tank B is connected with the water glass tank in parallel, a three-way valve is arranged between the clean water tank B and the water glass tank, a first interface of the three-way valve is connected with the clean water tank B, a second interface of the three-way valve is connected with the water glass tank, and a third interface of the three-way valve is connected to a drill rod through a high-pressure water pump.
Furthermore, the nozzles are arranged at the bottoms of the inner slurry conveying pipe and the outer water conveying pipe, the nozzles of the inner slurry conveying pipe and the nozzles of the outer water conveying pipe are arranged in a staggered mode, the diameter of each nozzle is set to be 3.5mm, so that the nozzles are not prone to blockage, water glass and cement slurry can be mixed more quickly and effectively, a leakage blocking body is formed quickly, a water outlet channel is sealed, and leakage blocking efficiency is improved remarkably.
Further, be connected through high-pressure hose between stake machine backstage and the drilling rod, the joint between stake machine backstage and the high-pressure hose, the joint between drilling rod and the high-pressure hose all adopt bayonet joint, buckle formula joint department is provided with the sealing washer, has strengthened stability and the leakproofness of being connected between stake machine backstage and the high-pressure hose, between drilling rod and the high-pressure hose.
Furthermore, the water glass is sodium water glass, and the cement paste is ordinary portland cement. Because the water glass has better acid resistance and poorer alkali resistance, the cement paste matched with the water glass needs to adopt common portland cement with the cement mark PO 42.5.
Example 2
A plugging method for quickly plugging leakage points of a waterproof curtain comprises the following steps:
s1, leakage finding: when the waterproof curtain is found to have a leakage problem, the leakage position is stabilized by back pressure backfill;
s2, security inspection and equipment installation: installing leakage blocking equipment above a foundation pit leakage position, wherein the leakage blocking equipment comprises a drilling machine, a drilling rod and a pile machine background, the drilling machine is horizontally arranged, the drilling rod is vertically aligned with a drilling center line, the inclination of the drilling rod is not more than 1.5%, the pile machine background comprises a slurry pipeline and a water channel which are arranged in parallel, and the slurry pipeline is used for providing cement slurry; the water path is used for providing water and water glass; a water conveying outer pipe for conveying water glass or water and a slurry conveying inner pipe for conveying cement slurry are arranged in the drill rod; and (4) before construction, checking grouting equipment and a pipeline system, debugging, and adjusting according to the condition of a test pile during construction. The sealing ring of the pipeline system is required to be good, sundries cannot be left in each channel and each nozzle, the measuring instrument is qualified in inspection, and the slurry suction hose is required to be an armored rubber pipe in a verification period;
s3, troubleshooting missing points: drilling holes at the periphery of the waterproof curtain by adopting leakage stopping equipment, carefully measuring and recording actual hole positions, hole depths and stratum change conditions in the drilling process, then injecting cement slurry with a water-cement ratio of 1.2 into the inner pipe, wherein the grouting pressure is 5MPa, simultaneously injecting clear water into the outer pipe, the water injection pressure value is 1MPa, and determining a leakage point according to the leakage position of the cement slurry;
s4, secondary plugging: drilling a drill rod to a position 3m below a leakage point of a foundation pit, performing secondary high-pressure double-liquid rotary jet grouting by adopting a double-pipe method, wherein the grouting direction is from bottom to top, the grouting drilling speed is 10cm/min, cement slurry with the water-cement ratio of 0.7 is injected into an inner pipe, water glass is simultaneously injected into an outer pipe, and the injection pressure of a water glass pipe is 5 MPa;
wherein, the process of the first grouting comprises the following steps: grouting under 25MPa, performing fixed spraying for 2min when the grouting pipe reaches the leakage depth, stopping for 5min after grouting, fully mixing the grout with the surrounding soil body, and performing primary hardening and forming to form a hardened plugging body;
the second grouting process comprises the following steps: after the first grouting pause is finished, performing second grouting at the grouting pressure of 35MPa to densely fill small pores in the hardened plugging body to form a denser plugging body;
s5, checking the plugging effect: after grouting for 48 hours, soil body cut is inspected to stop water effect: when the original leakage point does not leak any more, the leakage stoppage is finished; and when micro-seepage exists at the original leakage point, repeating the steps S3 and S4 to perform secondary leakage stopping until the micro-seepage stops.
Furthermore, the slurry must be stirred after various machines and tools run normally, measures should be taken in the slurry preparation process to prevent the slurry from precipitating, and meanwhile, the mixing ratio of the water glass and the cement slurry is prepared on site to meet the quick setting requirement, and the slurry is prepared for use immediately to prevent solidification.
Further, the mud line includes: the slurry mixing device comprises a cement bin, a clear water tank A, a slurry mixer, a paddle barrel and a high-pressure slurry pump, wherein the cement bin and the clear water tank A are respectively connected to the slurry mixer, the slurry mixer is connected to the paddle barrel, and the high-pressure slurry pump is arranged between the paddle barrel and a drill rod; the waterway includes: the device comprises a clean water tank B and a water glass tank, wherein the clean water tank B is connected with the water glass tank in parallel, a three-way valve is arranged between the clean water tank B and the water glass tank, a first interface of the three-way valve is connected with the clean water tank B, a second interface of the three-way valve is connected with the water glass tank, and a third interface of the three-way valve is connected to a drill rod through a high-pressure water pump.
Furthermore, the nozzles are arranged at the bottoms of the inner slurry conveying pipe and the outer water conveying pipe, the nozzles of the inner slurry conveying pipe and the nozzles of the outer water conveying pipe are arranged in a staggered mode, the diameter of each nozzle is set to be 5mm, so that the nozzles are not prone to blockage, water glass and cement slurry can be mixed more quickly and effectively, a leakage blocking body is formed quickly, a water outlet channel is sealed, and leakage blocking efficiency is improved remarkably.
Further, be connected through high-pressure hose between stake machine backstage and the drilling rod, the joint between stake machine backstage and the high-pressure hose, the joint between drilling rod and the high-pressure hose all adopt bayonet joint, buckle formula joint department is provided with the sealing washer, has strengthened stability and the leakproofness of being connected between stake machine backstage and the high-pressure hose, between drilling rod and the high-pressure hose.
Furthermore, the water glass is potassium water glass, and the cement paste is ordinary portland cement. Because the water glass has better acid resistance and poorer alkali resistance, the cement paste matched with the water glass needs to adopt common portland cement with the cement mark PO 42.5.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A plugging method for quickly plugging leakage points of a waterproof curtain is characterized by comprising the following steps:
s1, leakage finding: when the waterproof curtain is found to have a leakage problem, the leakage position is stabilized by back pressure backfill;
s2, security inspection and equipment installation: installing leakage blocking equipment above a leakage position of a foundation pit, wherein the leakage blocking equipment comprises a drilling machine, a drilling rod and a pile machine background, the drilling machine is horizontally arranged, the drilling rod is vertically aligned with a central line of a drilling hole, the pile machine background comprises a slurry pipeline and a water pipeline which are arranged in parallel, and the slurry pipeline is used for providing cement slurry; the water pipeline is used for providing water and water glass; a water conveying outer pipe for conveying water glass or water and a slurry conveying inner pipe for conveying cement slurry are arranged in the drill rod;
s3, troubleshooting missing points: drilling holes in the periphery of the waterproof curtain by adopting leakage stopping equipment, then injecting cement slurry with a water-cement ratio of 1.0-1.2 into the inner pipe, wherein the grouting pressure is 3-5 MPa, injecting clean water into the outer pipe at the same time, and determining a leakage point according to the leakage position of the cement slurry, wherein the water injection pressure value is 1 MPa;
s4, secondary plugging: drilling a drill rod to a position 2-3m below a leakage point of a foundation pit, performing secondary high-pressure double-liquid rotary spraying grouting by adopting a double-pipe method, wherein the grouting direction is from bottom to top, the grouting drilling speed is 5-10 cm/min, cement slurry with the water-cement ratio of 0.5-0.7 is injected into an inner pipe, water glass is simultaneously injected into an outer pipe, and the injection pressure of the water glass pipe is 5 MPa;
wherein, the process of the first grouting comprises the following steps: grouting under the pressure of 15-25 MPa, performing fixed spraying for 1-2 min when a grouting pipe reaches the leakage depth, stopping for 2-5 min after grouting, fully mixing grout with a peripheral soil body, and performing primary hardening molding to form a hardened plugging body;
the second grouting process comprises the following steps: after the first grouting pause is finished, performing second grouting at the grouting pressure of 25-35 MPa to densely fill small pores in the hardened plugging body to form a denser plugging body;
s5, checking the plugging effect: after grouting for 36-48 hours, soil body cut is inspected to stop water effect: when the original leakage point does not leak any more, the leakage stoppage is finished; and when micro-seepage exists at the original leakage point, repeating the steps S3 and S4 to perform secondary leakage stopping until the micro-seepage stops.
2. The plugging method for quickly plugging a leak point of a waterproof curtain according to claim 1, wherein the slurry pipeline comprises: the slurry mixing device comprises a cement bin, a clear water tank A, a slurry mixer, a paddle barrel and a high-pressure slurry pump, wherein the cement bin and the clear water tank A are respectively connected to the slurry mixer, the slurry mixer is connected to the paddle barrel, and the high-pressure slurry pump is arranged between the paddle barrel and a drill rod; the waterway includes: the device comprises a clean water tank B and a water glass tank, wherein the clean water tank B is connected with the water glass tank in parallel, a three-way valve is arranged between the clean water tank B and the water glass tank, a first interface of the three-way valve is connected with the clean water tank B, a second interface of the three-way valve is connected with the water glass tank, and a third interface of the three-way valve is connected to a drill rod through a high-pressure water pump.
3. The plugging method for rapidly plugging a leakage point of a waterproof curtain as claimed in claim 1, wherein a plurality of nozzles are respectively arranged at the bottom of the inner slurry conveying pipe and the bottom of the outer water conveying pipe, the nozzles of the inner slurry conveying pipe and the nozzles of the outer water conveying pipe are arranged in a staggered manner, and the diameters of the nozzles are 3.5-5 mm.
4. The method for quickly plugging the leakage point of the waterproof curtain as claimed in claim 1, wherein the background of the pile machine is connected with the drill rod through a high-pressure hose, and the joints between the background of the pile machine and the high-pressure hose and the joints between the drill rod and the high-pressure hose are all bayonet joints.
5. The method for rapidly plugging a leak of a waterproof curtain as claimed in claim 4, wherein a sealing ring is provided at the snap-in joint.
6. The method for rapidly plugging a leak of a waterproof curtain as claimed in claim 1, wherein the water glass is one or more of sodium water glass or potassium water glass.
7. The method for rapidly plugging a leakage point of a waterproof curtain as claimed in claim 1, wherein the cement paste is ordinary portland cement.
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| CN115387391A (en) * | 2022-07-29 | 2022-11-25 | 中铁建设集团南方工程有限公司 | Ultra-deep foundation pit diaphragm wall plugging construction method |
| CN115710922A (en) * | 2022-10-13 | 2023-02-24 | 广东一新长城建筑集团有限公司 | Leakage point plugging method for mixing pile waterproof curtain of foundation pit |
| CN115710922B (en) * | 2022-10-13 | 2023-09-12 | 广东一新长城建筑集团有限公司 | Leakage point plugging method for stirring pile waterproof curtain of foundation pit |
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