CN110670613B - Foundation pit elevator shaft water seepage prevention structure and construction method thereof - Google Patents

Foundation pit elevator shaft water seepage prevention structure and construction method thereof Download PDF

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Publication number
CN110670613B
CN110670613B CN201910778427.7A CN201910778427A CN110670613B CN 110670613 B CN110670613 B CN 110670613B CN 201910778427 A CN201910778427 A CN 201910778427A CN 110670613 B CN110670613 B CN 110670613B
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water
pit
pipe
vertical groove
seepage
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CN110670613A (en
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王华林
周少华
陈军
李庆
刘卫
刘敬
王想红
纪银凤
万士锦
张爱国
刘彦彬
黄军锋
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Beijing Dongdi Geotechnical Engineering Co ltd
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Beijing Dongdi Geotechnical Engineering Co ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/08Restraining of underground water by employing open ditches arranged below the level of the water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)

Abstract

The invention relates to a water seepage prevention structure of a pit elevator shaft, which comprises a pit, wherein a pit body is arranged in the pit, a water collecting pit is arranged in the pit body, a horizontal groove is formed in a water seepage stratum of the pit body, a flower pipe is embedded in the horizontal groove, the horizontal groove extends downwards to form a vertical groove communicated with the water collecting pit, one end of the vertical groove is connected with the flower pipe, the other end of the vertical groove is communicated with a water conveying pipe of the water collecting pit, and cement mortar for sealing the water seepage stratum is filled in the horizontal groove and the vertical groove; a water pump is arranged in the water collecting pit, the water pump is connected with a drain pipe embedded into the inner wall of the pit body, and the drain pipe extends into a drain ditch of the foundation pit; the water-permeable filling material is arranged in the water collecting pit, the concrete cushion layer is arranged at the bottom of the pit body, the waterproof layer is arranged at the bottom of the pit body and on the peripheral wall, and the protective layer is arranged on the waterproof layer. Through buried flower pipe and drain pipe in the pit body in the secretly, can not influence the construction of concrete cushion and waterproof layer when discharging the infiltration, have saving construction cycle, improve the construction quality's of concrete cushion and waterproof layer advantage.

Description

Foundation pit elevator shaft water seepage prevention structure and construction method thereof
Technical Field
The invention relates to the technical field of elevator shaft seepage prevention, in particular to a foundation pit elevator shaft seepage prevention structure and a construction method thereof.
Background
When the building foundation is constructed, because the water is reflected by the underground water, excessive accumulated water often occurs in the elevator shaft, so that the elevator shaft cannot perform the construction of the concrete cushion layer and the waterproof coiled material paving process, and measures are needed to be taken to reduce the accumulated water height of the underground water in the elevator shaft foundation pit to below the construction height.
The traditional elevator shaft construction process generally adopts the method that the water level of the basement is wholly lowered below the bottommost part of the elevator shaft, and then the next construction is carried out, but the whole dewatering process of the method has long period, low efficiency, high construction period and dewatering cost, and is difficult to meet the strict requirements of fast rhythm and construction period on site.
The prior art, the application number CN201710093450.3 which can be referred to, is a method for dewatering in the waterproof construction of a pit body of a ground building under a water resource rich environment, which comprises the following steps:
step a, arranging a water drop pit at the bottom of the pit body, and arranging a water suction pump in the water drop pit;
b, arranging a cover plate above the water dropping pit, prefabricating a sleeve or a reserved hole in the center of the cover plate, and penetrating out a water suction pump cable and a water drain pipe from the sleeve or the hole; the waterproof layer at the bottom of the pit body is paved to the periphery of the sleeve or the hole for closing up;
step c, cutting off a drain pipe and a cable of the suction pump before pouring the underground building pit body;
step d, filling graded sand and stone into the water drop pit from the central sleeve or hole of the cover plate;
step e, pouring concrete from the central sleeve or hole of the cover plate into the dewatering pit until the bottom plane of the pit body, and then sealing the central sleeve or hole of the cover plate with quick setting cement to be level with the upper surface of the cover plate;
step f, paving a waterproof layer at the central sleeve or hole part of the cover plate and overlapping the waterproof layer at the bottom of the pit body;
and g, pouring pit structure concrete.
The prior art solutions described above have the following drawbacks: when the stratum where the pit body is located has an interlayer which is easy to permeate water, such as a silt layer, underground water can permeate water continuously to the inside of the pit body along the silt layer from the inner wall of the pit body, and a water pump positioned in the dewatering pit cannot timely discharge water which is permeated from the silt layer, so that the concrete cushion layer and the waterproof layer in the pit body cannot be constructed.
Disclosure of Invention
The invention provides a seepage-proofing structure of a foundation pit elevator shaft, which can timely discharge seepage in a pit body and has the advantages of saving construction period and improving construction quality of a concrete cushion layer and a waterproof layer.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a foundation ditch elevator shaft prevention of seepage water structure, includes the foundation ditch, the foundation ditch sets up the position of elevator shaft and is provided with the hole body, the internal excavation in hole has the sump pit, its characterized in that: the water seepage stratum is characterized in that a horizontal groove is formed in the pit body along the circumferential direction of the water seepage stratum, a flower pipe is buried in the horizontal groove, the horizontal groove extends downwards to form a vertical groove communicated with the water collection pit, one end of the vertical groove is connected with the flower pipe, the other end of the vertical groove is communicated with a water pipe of the water collection pit, and cement mortar for sealing the water seepage stratum is filled in the horizontal groove and the vertical groove; a water pump is arranged in the water collecting pit, the water pump is connected with a drain pipe embedded into the inner wall of the pit body, and the drain pipe extends into a drain ditch of the foundation pit;
the water-permeable filling material is arranged in the water collecting pit, a concrete cushion layer is arranged at the bottom of the pit body, a waterproof layer is arranged on the bottom of the pit body and the peripheral wall, and a protective layer is arranged on the waterproof layer.
By adopting the technical scheme, the flower pipe is buried in the interlayer easy to permeate water, the horizontal groove and the vertical groove are sealed by cement mortar, so that water in the interlayer is discharged into the water collecting pit through the flower pipe and the water pipe, and then water is discharged into the foundation pit drainage ditch through the water pump in the water collecting pit, the water in the pit body can be discharged timely through the buried flower pipe and the water drain pipe, the influence on the subsequent construction of the concrete cushion layer and the waterproof layer is avoided, the water can be continuously pumped out of the pit body in the construction process of the subsequent concrete cushion layer and the waterproof layer and is drained into the foundation pit drainage ditch, and the water oozed in the water seepage interlayer is prevented from flowing to the bottom of the pit body, so that the concrete cushion layer cannot be constructed, or the concrete cushion layer is poured and the water seepage are mixed to cause quality problems such as segregation; the water-permeable filling material is filled in the water collecting pit, and the water collecting pit and the bottom surface of the pit body are filled and leveled, so that the construction of the concrete cushion layer and the waterproof layer is performed while the water in the pit body is reduced, the working efficiency is high, and the construction period is saved; meanwhile, the side wall of the pit body can be prevented from being leaked outwards, the waterproof layer is not paved stably under the action of the water seepage pressure, and the method has the advantages of saving the construction period and improving the construction quality of the concrete cushion layer and the waterproof layer.
The invention is further provided with: and a cover plate is arranged on the water collecting pit.
Through adopting above-mentioned technical scheme, can strengthen the bearing capacity of sump pit department, the pouring of later stage concrete cushion of being convenient for, simultaneously, the apron can prevent that the thick liquid in the concrete cushion from flowing to the sump pit in, when the initial setting, blocks up the water pump.
The invention is further provided with: the water-permeable filler is pebble or broken stone.
Through adopting above-mentioned technical scheme, the water permeability is good, and fills after accomplishing, and the bearing capacity is high, is convenient for carry out of later stage construction.
The invention is further provided with: the grain diameter of the water permeable filler is 10-30mm.
The invention is further provided with: the vertical groove extends upwards to the top of the pit body, and the drain pipe is communicated with the foundation pit drainage ditch through the vertical groove.
By adopting the technical scheme, the construction is convenient, the sealing is carried out, the construction time is saved, and the construction efficiency is improved.
The invention is further provided with: two water pumps are arranged in the water collecting pit and are respectively connected with a drain pipe.
Through adopting above-mentioned technical scheme, two water pumps, one drainage, one reserve, prevent at the in-process of precipitation, the water pump breaks down, influences the drainage function.
The invention is further provided with: the flower pipe is a hose.
By adopting the technical scheme, the pipe is convenient to bend and is placed in the horizontal groove.
The invention is further provided with: the protective layer is formed by casting fine stone concrete.
By adopting the technical scheme, the protection capability of the waterproof layer is improved.
The invention is further provided with: the water tank is sleeved with an iron barrel, a plurality of water filtering holes are formed in the side wall of the iron barrel, and through holes for a water supply and drainage pipe and a water delivery pipe to pass through are formed in the iron barrel.
Through adopting above-mentioned technical scheme, the iron bucket setting can prevent that the sump from collapsing in the sump pit, increases the bearing capacity of sump pit department.
The second object of the invention is to provide a construction method of a foundation pit elevator shaft water seepage prevention structure, which comprises the following steps:
s1, paying off the position of the pit body of the elevator after the foundation pit is excavated by dewatering, marking, and excavating;
s2, digging a water collecting pit deeper than the bottom surface of the pit body by 1-2m at the bottom of the pit body, and placing a water pump in the water collecting pit;
s3, horizontal grooves are formed in the position of the water seepage prone stratum in the stratum of the pit body along the circumferential direction of the pit body, the height of each horizontal groove is identical to the thickness of the water seepage stratum, vertical grooves communicated with the horizontal grooves are formed in the inner wall of the pit body, the tops of the vertical grooves are communicated with the top surface of the pit body, and the bottoms of the vertical grooves are communicated with the water collecting pit;
s4, arranging a circle of flower pipes along the horizontal groove, and arranging a water pipe with one end communicated with the flower pipes and the other end communicated with the water collecting pit in the vertical groove;
s5, connecting a drain pipe to the water pump, extending the drain pipe and a water pump cable to a foundation pit drainage ditch along the vertical groove, and filling cement mortar into the horizontal groove and the vertical groove for sealing;
s6, filling broken stone into the water collection pit, covering a cover plate, and draining the pit body;
and S7, sequentially constructing a concrete cushion layer, a waterproof layer and a protective layer, continuously discharging the water seepage in the pit body through a water pump during construction, cutting off a drain pipe and a cable after the construction of the protective layer is completed, and discarding the water pump in the water pit.
In summary, the beneficial technical effects of the invention are as follows:
the flower pipe is buried in the interlayer easy to permeate water in a hidden manner, the horizontal groove and the vertical groove are sealed by cement mortar, so that water in the interlayer is discharged into the water collecting pit through the flower pipe and the water pipe, and then water is discharged into the foundation pit drainage ditch through the water pump in the water collecting pit, so that the water in the pit body can be timely discharged, the influence on the subsequent construction of the concrete cushion layer and the waterproof layer is avoided, in the subsequent construction process of the concrete cushion layer and the waterproof layer, the water can be continuously pumped out of the pit body, and is drained into the foundation pit drainage ditch, the water seeping from the water seepage interlayer is prevented from flowing to the bottom of the pit body, and the quality problems of segregation and the like caused by the fact that the concrete cushion layer cannot be constructed or the concrete cushion layer is poured and the water seepage are mixed are avoided; the water-permeable filling material is filled in the water collecting pit, and the water collecting pit and the bottom surface of the pit body are filled and leveled, so that the construction of the concrete cushion layer and the waterproof layer is performed while the water in the pit body is reduced, the working efficiency is high, and the construction period is saved; meanwhile, the side wall of the pit body can be prevented from being leaked outwards, the waterproof layer is not paved stably under the action of the water seepage pressure, and the method has the advantages of saving the construction period and improving the construction quality of the concrete cushion layer and the waterproof layer.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1, pit body; 2. a water collecting pit; 3. a water pump; 4. a horizontal groove; 5. a flower tube; 6. a vertical groove; 7. a water pipe; 8. cement mortar; 9. a drain pipe; 10. a water permeable filler; 11. a concrete cushion layer; 12. a waterproof layer; 13. a protective layer; 14. a cover plate; 15. an iron barrel; 16. and (5) water seepage stratum.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Embodiment one:
referring to fig. 1, the invention discloses a water seepage prevention structure of a pit elevator shaft, which comprises a pit, wherein a pit body 1 is formed by excavating a position of the pit where the elevator shaft is arranged, a water collecting pit 2 is excavated at the bottom of the pit body 1, a water pump 3 is arranged in the water collecting pit 2, and the depth of the water collecting pit 2 is 1-2m and is larger than the height of the water pump 3. Horizontal grooves 4 are formed in the position of the silt layer of the pit body 1 along the circumferential direction of the pit body 1, and the width of each horizontal groove 4 is the same as the thickness of the silt layer. A circle of flower pipes 5 are buried in the horizontal groove 4, and the flower pipes 5 are flexible pipes, so that the flower pipes 5 are convenient to bend and placed in the horizontal groove 4. A vertical groove 6 is formed in the side wall of the pit body 1, one end of the vertical groove 6 is communicated with the horizontal groove 4, and the other end is communicated with the water collection pit 2. The vertical groove 6 is internally provided with a water pipe 7, one end of which is connected with the flower pipe 5, and the other end of which is communicated with the water collecting pit 2, and quick setting cement mortar 8 is filled in the horizontal groove 4 and the vertical groove 6 to seal the horizontal groove 4 and the vertical groove 6. The water pump 3 is arranged in the water collecting pit 2, the water pump 3 is connected with the drain pipe 9 embedded in the inner wall of the pit body 1, and the water outlet end of the drain pipe 9 extends out of the pit body 1 and extends into the drain ditch of the foundation pit. The water-permeable filling material 10 is filled in the water-collecting pit 2, the water-permeable filling material 10 is pebble or broken stone, the grain size is 10-30mm, the water permeability is good, and after filling, the bearing capacity is high, so that the later construction is convenient to carry out. The bottom of the pit body 1 is provided with a concrete cushion layer 11, the bottom and the peripheral wall of the pit body 1 are provided with a waterproof layer 12, the waterproof layer 12 is a waterproof coiled material, a protective layer 13 for protecting the waterproof layer 12 is poured on the waterproof layer 12, and the protective layer 13 is formed by fine stone concrete pouring. After the construction of the protective layer 13 is completed, the cable and the drain pipe 9 of the water pump 3 are cut off, and the water pump 3 is discarded in the water pit 2.
The water seepage in the interlayer is discharged into the water pit 2 through the flowtube 5 and the water pipe 7, and then is discharged into the foundation pit drainage ditch through the water pump 3 in the water pit 2, the water seepage in the pit 1 can be timely discharged through the buried flowtube 5 and the water pipe 9, the subsequent construction of the concrete cushion 11 and the waterproof layer 12 is avoided, the water seepage can be continuously pumped out of the pit 1 in the subsequent construction process of the concrete cushion 11 and the waterproof layer 12 and is drained into the foundation pit drainage ditch, and the problem that the concrete cushion 11 cannot be constructed or the concrete cushion 11 and the water seepage are mixed to cause segregation and other quality problems is prevented; the water-permeable filling material 10 is filled in the water collection pit 2, and the water collection pit 2 and the bottom surface of the pit body 1 are filled and leveled, so that the construction of the concrete cushion layer 11 and the waterproof layer 12 is performed while the water in the pit body 1 is reduced, the working efficiency is high, and the construction period is saved; meanwhile, the side wall of the pit body 1 can be prevented from being leaked outwards, and the waterproof layer 12 is not paved stably under the action of the water seepage pressure.
Set up on sump pit 2 with sump pit 2 upper end confined apron 14, apron 14 lid is established at sump pit 2 top, seals sump pit 2, can strengthen the bearing capacity of sump pit 2 department, and the pouring of later stage concrete cushion 11 of being convenient for, simultaneously, apron 14 can prevent that the thick liquid in the concrete cushion 11 from flowing to sump pit 2, when the initial setting, blocks up water pump 3.
Further, the vertical groove 6 upwards extends to the top of the pit body 1, the drain pipe 9 is communicated with the foundation pit drainage ditch through the vertical groove 6, the drain pipe 9 and the water conveying pipe 7 are connected with one vertical groove 6 in common, construction and sealing are facilitated, construction time is saved, and construction efficiency is improved.
Two water pumps 3 are arranged in the water collecting pit 2, the two water pumps 3 are respectively connected with a drain pipe 9, the two water pumps 3 are used for draining water, and the water pump 3 is prevented from malfunctioning in the process of precipitation to influence the drainage function.
The water collection pit 2 is sleeved with an iron drum 15, a plurality of water filtering holes are formed in the side wall of the iron drum 15, water seepage from the outside stretches into the water collection pit 2, and through holes for the water drainage pipe 9 and the water conveying pipe 7 to penetrate are formed in the iron drum 15. The iron drum 15 is arranged in the water collection pit 2, so that collapse of the water collection pit 2 can be prevented, and the bearing capacity of the water collection pit 2 is increased.
Embodiment two:
referring to fig. 1, a construction method of a water seepage prevention structure of a foundation pit elevator shaft comprises the following steps:
s1, paying off the position of the pit body 1 of the elevator by using a total station after the foundation pit dewatering excavation is completed, marking, excavating the pit body 1 by using a digger according to the marking, and carrying out 45-60-degree slope release according to the on-site geological condition during excavation, thereby ensuring the stability of the side wall of the pit body 1 and preventing collapse.
S2, digging the bottom of the pit body 1 to form a water collecting pit 2, wherein the depth of the water collecting pit 2 is greater than the height of the water pump 3, preferably 1-2m, placing the iron drum 15 in the water collecting pit 2 for plasticity, placing the water pump 3 in the water collecting pit 2, and discharging water seepage in the pit body 1.
S3, horizontal grooves 4 are formed in positions, along the circumferential direction of the pit body 1, of water seepage formations 16 in the stratum of the pit body 1, the height of each horizontal groove 4 is identical to the thickness of each water seepage formation 16, vertical grooves 6 communicated with the corresponding horizontal grooves 4 are formed in the inner wall of the pit body 1, the tops of the vertical grooves 6 are communicated with the top surface of the pit body 1, and the bottoms of the vertical grooves horizontally extend towards the water collection pit 2 to be communicated with the water collection pit 2.
S4, arranging a circle of floral tubes 5 along the horizontal groove 4, and arranging a water pipe 7 with one end communicated with the floral tubes 5 and the other end communicated with the water collecting pit 2 in the vertical groove 6. The flower pipe 5 is used for collecting water in the water seepage stratum 16 and then is discharged into the water collecting pit 2 through the water conveying pipe 7.
S5, connecting a drain pipe 9 on the water pump 3, enabling the drain pipe 9 and a cable of the water pump 3 to extend to a foundation pit drainage ditch along the vertical groove 6, and then filling quick setting cement mortar 8 into the horizontal groove 4 and the vertical groove 6 for sealing so as to prevent water seepage from the horizontal groove 4 and the vertical groove 6.
S6, filling broken stone into the water collection pit 2, covering the broken stone with the cover plate 14, connecting a cable, and discharging water seepage in the water collection pit 2 into a drainage ditch in the foundation pit by the water pump 3.
And S7, sequentially constructing the concrete cushion layer 11, the waterproof layer 12 and the protective layer 13, continuously discharging water seepage in the pit body 1 through the water pump 3 during construction, cutting off the drain pipe 9 and the cable after the construction of the protective layer 13 is completed, and discarding the water pump 3 in the water pit 2.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims (8)

1. The utility model provides a foundation ditch elevator shaft prevention of seepage water structure, includes the foundation ditch, the foundation ditch sets up the position of elevator shaft and is provided with the hole body (1), the excavation has sump pit (2), its characterized in that in the hole body (1): the water seepage pit is characterized in that the pit body (1) is provided with a horizontal groove (4) at the water seepage stratum (16) along the circumferential direction of the pit body (1), a flower pipe (5) is buried in the horizontal groove (4), the horizontal groove (4) downwards extends to form a vertical groove (6) communicated with the water seepage stratum (2), one end of the vertical groove (6) is connected with the flower pipe (5), the other end of the vertical groove is communicated with a water delivery pipe (7) of the water seepage stratum (2), and cement mortar (8) for sealing the water seepage stratum (16) is filled in the horizontal groove (4) and the vertical groove (6); a water pump (3) is arranged in the water collecting pit (2), the water pump (3) is connected with a drain pipe (9) embedded into the inner wall of the pit body (1), and the drain pipe (9) extends into a drain ditch of the foundation pit; the water-permeable filling material (10) is arranged in the water collecting pit (2), a concrete cushion layer (11) is arranged at the bottom of the pit body (1), a waterproof layer (12) is arranged at the bottom and on the peripheral wall of the pit body (1), and a protective layer (13) is arranged on the waterproof layer (12);
the seepage in the pit body can be discharged timely through the buried flower pipe (5) and the drain pipe (9), the influence on the subsequent construction of the concrete cushion layer and the waterproof layer is avoided, and the seepage can be continuously extracted out of the pit body in the subsequent construction process of the concrete cushion layer and the waterproof layer;
a cover plate (14) is arranged on the water collecting pit (2);
the water-permeable filler (10) is pebble or broken stone.
2. The foundation pit elevator shaft water seepage prevention structure according to claim 1, wherein: the particle size of the water-permeable filler (10) is 10-30mm.
3. The foundation pit elevator shaft water seepage prevention structure according to claim 1, wherein: the vertical groove (6) extends upwards to the top of the pit body (1), and the drain pipe (9) is communicated with the foundation pit drainage ditch through the vertical groove (6).
4. The foundation pit elevator shaft water seepage prevention structure according to claim 1, wherein: two water pumps (3) are arranged in the water collecting pit (2), and the two water pumps (3) are respectively connected with a drain pipe (9).
5. The foundation pit elevator shaft water seepage prevention structure according to claim 1, wherein: the flower pipe (5) is a hose.
6. The foundation pit elevator shaft water seepage prevention structure according to claim 1, wherein: the protective layer (13) is formed by casting fine stone concrete.
7. The foundation pit elevator shaft water seepage prevention structure according to claim 1, wherein: an iron drum (15) is sleeved in the water collecting pit (2), a plurality of water filtering holes are formed in the side wall of the iron drum (15), and through holes for the water supply and drainage pipe (9) and the water conveying pipe (7) to pass through are formed in the iron drum (15).
8. The construction method of the water seepage prevention structure of the foundation pit elevator shaft is characterized by comprising the following steps of
S1, paying off the position of an elevator pit body (1) after the foundation pit dewatering excavation is completed, marking, and excavating;
s2, digging a water collecting pit (2) deeper than the bottom surface 1-2m of the pit body (1) at the bottom of the pit body (1), and placing a water pump (3) in the water collecting pit (2);
s3, a horizontal groove (4) is formed in a position of a water seepage prone stratum (16) in a stratum of the pit body (1) along the circumferential direction of the pit body (1), the height of the horizontal groove (4) is identical to the thickness of the water seepage stratum (16), a vertical groove (6) communicated with the horizontal groove (4) is formed in the inner wall of the pit body (1), the top of the vertical groove (6) is communicated with the top surface of the pit body (1), and the bottom of the vertical groove is communicated with the water collecting pit (2);
s4, arranging a circle of flower pipes (5) along the horizontal groove (4), and arranging a water pipe (7) with one end communicated with the flower pipes (5) and the other end communicated with the water collecting pit (2) in the vertical groove (6);
s5, connecting a drain pipe (9) on the water pump (3), enabling the drain pipe (9) and a cable of the water pump (3) to extend to a foundation pit drainage ditch along the vertical groove (6), and then filling cement mortar (8) into the horizontal groove (4) and the vertical groove (6) for sealing;
s6, filling broken stone into the water collection pit (2) and covering a cover plate (14), and draining the pit body (1);
s7, sequentially constructing a concrete cushion layer (11), a waterproof layer (12) and a protective layer (13), continuously discharging water seepage in the pit body (1) through the water pump (3) during construction, cutting off the water drain pipe (9) and the cable after the construction of the protective layer (13) is completed, and discarding the water pump (3) in the water collecting pit (2).
CN201910778427.7A 2019-08-22 2019-08-22 Foundation pit elevator shaft water seepage prevention structure and construction method thereof Active CN110670613B (en)

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CN113136884A (en) * 2021-04-26 2021-07-20 中国二十二冶集团有限公司 Construction method of strongly weathered rock foundation pit well rich in low-pressure-bearing fracture water

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