CN110847199A - Construction method for drainage of underground water of deep foundation pit - Google Patents

Construction method for drainage of underground water of deep foundation pit Download PDF

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Publication number
CN110847199A
CN110847199A CN201911103089.3A CN201911103089A CN110847199A CN 110847199 A CN110847199 A CN 110847199A CN 201911103089 A CN201911103089 A CN 201911103089A CN 110847199 A CN110847199 A CN 110847199A
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China
Prior art keywords
water
drainage
foundation pit
dry
pit
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CN201911103089.3A
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Chinese (zh)
Inventor
杨前
杨安琪
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China MCC20 Group Corp Ltd
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China MCC20 Group Corp Ltd
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Priority to CN201911103089.3A priority Critical patent/CN110847199A/en
Publication of CN110847199A publication Critical patent/CN110847199A/en
Pending legal-status Critical Current

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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
    • 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
    • E02D19/10Restraining of underground water by lowering level of ground water

Abstract

A construction method for underground water buried drainage of a deep foundation pit is characterized by comprising the following steps: a. pre-manufacturing an embedded dry well, b, installing a bottom plate structure embedded drain pipe, and c, draining the underground water of the deep foundation pit by drainage. The construction method for the drainage of the underground water of the deep foundation pit has the advantages that the drainage system for the underground water of the deep foundation pit is simple in structure, convenient to arrange and safe and controllable in engineering quality, the technical problem of precipitation of the water-containing deep foundation pit in a sand layer can be solved, the drainage system for the underground water of the deep foundation pit is wide in applicability, can be applied to drainage of the deep foundation pit of various underground engineering, is low in drainage engineering cost, and can be used for manufacturing dry wells in batches and forming industrialized patterns.

Description

Construction method for drainage of underground water of deep foundation pit
Technical Field
The invention relates to a foundation pit dewatering method, in particular to a deep foundation pit underground water buried drainage construction method.
Background
When a deep foundation pit is constructed, a closed enclosure waterproof curtain is formed on the foundation pit by an enclosure structure, then earthwork excavation and structural construction are carried out in the foundation pit, when the construction excavation meets the influence of underground water at a sand layer part to the bottom of the foundation pit, the difficulty of hole forming is very high when a dewatering well completion construction is carried out on a sand layer aquifer, meanwhile, mud needs to be artificially manufactured to carry out well hole wall protection, and certain influence is also caused on the engineering environment.
Chinese patent CN 202202335U discloses an internal drainage structure in deep foundation pit in 2012, 4/25, which includes drainage blind ditches and water collection wells, wherein the drainage blind ditches are respectively arranged below the post-cast strip and around the inner periphery of the shear wall of the basement, and the junction of the drainage blind ditches is provided with the water collection wells. The drainage blind ditch is formed by filling 50-100mm third stone and laying a layer of dense mesh net on the blind ditch as a sand separation layer. And a hidden drainage channel is formed on the drainage blind well and above the backfilled soil. The blind well is convenient for pumping and draining underground water during foundation construction and water seepage during the period that a post-cast strip is not closed. Although this technical scheme can guarantee not to produce the ponding phenomenon during the foundation slab construction, the slow drainage mode that its drainage french drain and collector well combined together can't deal with the foundation ditch and gush water.
Chinese patent CN108951674A discloses a structure and a method for lowering water at the sump bottom in 2018, 12/7, wherein a blind ditch is arranged at the bottom of the sump and a water pump is arranged at the outer side of the pit, one end of the blind ditch extends from the sump to the edge of the pit, a through groove is arranged in the middle of the blind ditch along the longitudinal length of the blind ditch, a first layer of water-permeable geotextile, a first layer of rubble or cobble, a second layer of water-permeable geotextile, a steel pipe, a second layer of rubble or cobble, a third layer of water-permeable geotextile and a third layer of rubble or cobble are sequentially laid in the through groove from bottom to top, the steel pipe is connected with the water pump at the outer side of the pit, and the steel pipe is only fully provided with holes on the pipe wall of the pipe section located in the. According to the technical scheme, earthwork mechanical excavation is carried out along the position of the blind ditch, manual groove cleaning and pit wall repairing are carried out, three layers of water seepage geotextiles are matched through three stones or cobblestones, labor and labor are wasted in the forming process of the drainage structure for drainage by the blind ditch, the dewatering speed is slow, dewatering can be achieved only in a long and time-consuming mode, the underground water treatment of the bottom of the foundation pit in a sand layer position is not suitable, and the damage of the deep foundation underground water gushing to engineering and environment cannot be solved.
Therefore, the known manner of dewatering the sump at the bottom of the deep foundation pit has various inconveniences and problems.
Disclosure of Invention
The invention aims to provide a safe and reliable construction method for underground water buried drainage of a deep foundation pit.
In order to achieve the purpose, the technical solution of the invention is as follows:
a construction method for underground water buried drainage of a deep foundation pit is characterized by comprising the following steps:
a. prefabricated embedded dry well
Pre-manufacturing a pre-buried dry pit, wherein the dry pit comprises a drain pipe and a dry pit body, the drain pipe is pre-buried into a structural part of a concrete bottom plate to be constructed, the dry pit body collects the water permeating from the bottom of the dry pit, and a water pump is arranged at the bottom of the dry pit and discharges the water permeating out of a foundation pit through the drain pipe; the dry pit body is arranged at the center of the permeable section, when the dry pit body is excavated to the water gushing position at the bottom of the foundation pit, a drainage part is quickly excavated, the permeable part at the bottom of the dry pit is pressed at the water gushing position at the bottom of the foundation pit, then broken stones are filled in the periphery of the dry pit for water filtration, regularly arranged blind ditches are radially excavated, PE permeable pipes with full filter holes are buried in the blind ditches, broken stones are filled in the periphery of the permeable pipes to form mutually communicated permeable blind ditches, and concrete cushion layers are poured after water-resisting films are covered on the upper parts of the blind ditches;
b. pre-buried drain pipe of mounting base plate structure
The method comprises the following steps that a drain pipe is embedded in an installation bottom plate structure, the diameter of the drain pipe is slightly larger than the maximum diameter part of a water pump so that the water pump can be placed at the bottom of an upland well body through the drain pipe, a round steel plate matched with the top end of the upland well body and having the same inner diameter is arranged at the bottom end of the drain pipe, a reinforcing rib plate is arranged on the round steel plate to increase the rigidity of the round steel plate, a plurality of water stop rings are arranged on the length direction of a pipe body of the drain pipe to be used for structural waterproofing, the round steel plate is;
c. drainage and drainage of underground water buried dry well of deep foundation pit
Arrange the water pump from bottom plate structure drain pipe upper mouth department, water pump stay cord and cable are fixed respectively on the lantern ring of drain pipe upper mouth outer fringe, open the groundwater that the water pump upwelled in the foundation ditch bottom after carrying out the drainage can be discharged in the pre-buried drought well through rubble french drain, the orderly inflow of PE pipe of permeating water, carry out bottom plate structure reinforcement and concrete and pour after the drainage, carry out the whole seal of pre-buried well after bottom plate structure concrete strength is up to standard.
The construction method for the underground water buried drainage of the deep foundation pit can be further realized by adopting the following technical measures.
The method, wherein the blind ditch is arranged around the shaft body.
In the method, the blind ditches are annularly arranged by taking the dry well body as the center.
In the method, the blind ditches are arranged in a cross shape by taking the dry well body as the center.
The method of the foregoing, wherein the water pump is a submersible pump.
In the method, the whole embedded well is sealed after the strength of the bottom plate structure concrete reaches more than or equal to 75%.
In the method, the number of the pre-buried dry wells is determined according to the working condition requirement.
In the method, when the permeable part at the bottom of the dry well is pressed at the water gushing position at the bottom of the foundation pit, a temporary drainage pump is arranged for draining water according to the water gushing condition so as to control the basement underground water level.
In the method, when the bottom plate structure concrete is poured, a water-stop film should be laid below the concrete cushion layer.
After the technical scheme is adopted, the construction method for the underground water buried drainage of the deep foundation pit has the following advantages:
1. the underground water buried drainage system of the deep foundation pit has a simple structure and is convenient to arrange;
2. the engineering quality is safe and controllable, the technical problem of dewatering of the deep foundation pit containing water in the sand layer can be solved,
3. the underground water buried drainage system of the deep foundation pit has wide applicability and can be applied to drainage of deep foundation pits of various underground projects;
3. the drainage engineering cost is low, and the dry well can be manufactured in batches by installing modules, so that an industrialized pattern is formed.
Drawings
FIG. 1 is a schematic view of a deep foundation pit underground water buried drainage system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first step of installing a dry well according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second step of installing a dry well according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a third step of installing the dry well according to the embodiment of the invention.
In the figure: 1 dry well, 2 water pumps, 3 annular rubble french drains, 4 cross rubble french drains, 5 the 1 st strainer, 6 the 2 nd strainer, 7 foundation ditch bottom sand layers, 8 concrete bed course, 9 dog, 10 water-stop membrane, 11 reinforced rib plate, 12 seal ring, 13 drain pipes, 14 lantern rings, 15 bottom plate structure concrete.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
Referring to fig. 1, fig. 1 is a schematic view of a deep foundation pit underground water buried drainage system according to an embodiment of the present invention. As shown in the figure, the prefabricated pre-buried dry well 1 is taken as a center, and a cross-shaped gravel blind ditch 4 and a surrounding annular gravel blind ditch 3 which are communicated with the pre-buried dry well are arranged through the center. The water pump 2 is arranged at the bottom of the dry well 1 and is a submersible pump.
The construction method for the underground water buried drainage of the deep foundation pit comprises the following steps:
a. pre-manufacturing an embedded dry well: the dry pit comprises a drain pipe and a dry pit body, the drain pipe is embedded into a structural part of a concrete bottom plate to be constructed, the dry pit body collects the water permeating from the bottom of the dry pit, a water pump is arranged at the bottom of the dry pit, and the water permeating is discharged out of the foundation pit through the drain pipe by the water pump; the dry pit body is set as a permeable section center, when the dry pit body is excavated to the water gushing position at the bottom of the foundation pit, a drainage part is quickly excavated, the permeable part at the bottom of the dry pit is pressed at the water gushing position at the bottom of the foundation pit, then broken stones are filled in the periphery of the dry pit for water filtration, blind ditches which are regularly arranged are radially excavated, PE permeable pipes which are full of filter holes are buried in the blind ditches, the broken stones are filled in the periphery of the permeable pipes to form the permeable blind ditches which are communicated with each other, and a concrete cushion is poured after the upper parts of the blind ditc. Regular blind ditches are radially excavated along with the shape of the foundation pit, and the blind ditches can be round, square or the combination form of the blind ditches. Wherein the depth of the deep foundation pit reaches more than 10m, the length of the drain pipe is 1500-3000mm, the diameter of the dry well steel pipe is 800mm, and the diameter of the filter hole is 30 mm.
b. Pre-buried drain pipe of mounting plate structure: the diameter of the water drainage pipe is slightly larger than the maximum diameter part of the water pump so that the water pump can be placed at the bottom of the dry well body through the water drainage pipe, the bottom end of the water drainage pipe is provided with a round steel plate matched with the same inner diameter of the top end of the dry well body, the round steel plate is provided with a reinforcing rib plate to increase the rigidity of the round steel plate, the length of a pipe body of the water drainage pipe is used as a structure for preventing water, the round steel plate is welded on a stop block of the inner diameter of the top end of the dry well body which is.
The dry well comprises the following specific installation steps:
fig. 2 is a schematic diagram of a first step of installing a dry well, wherein the dry well 1 is pre-embedded in a sand layer 7 at the bottom of a foundation pit, a stop block 9 is welded on the periphery of the inner side of the top end of a circular pipe of the dry well, a cross-shaped gravel blind ditch 4 is communicated with the dry well, a No. 1 water filter pipe 5 is embedded in the blind ditch, and a water-resisting film 10 is laid on a concrete cushion layer 8 above the blind ditch. And when the bottom plate structure concrete is poured, a water-resisting film is paved below the concrete cushion layer.
Fig. 3 is a schematic diagram of a second step of installing the dry well according to the embodiment of the invention, two water stop rings 12 are arranged on the outer side of the circumference of the drain pipe 13, a lantern ring 14 is arranged on the outer side of the top end of the drain pipe, and a round steel plate arranged at the bottom end of the drain pipe 13 is arranged on the stop block 9.
Fig. 4 is a schematic diagram of a third step of installing the dry well according to the embodiment of the invention, and pouring bottom plate structure concrete 15 in the drain pipe 13; the water pump 2 is arranged at the bottom of the dry well 1 to finish the step of burying the dry well.
c. Drainage and drainage of a deep foundation pit underground water buried dry well: the water pump is arranged from the upper opening of the drainage pipe of the bottom plate structure, the water pump pull rope and the cable are respectively fixed on the lantern ring at the outer edge of the upper opening of the drainage pipe, the water pump is started to drain, underground water rushing up from the bottom of the foundation pit can flow into the pre-buried dry pit through the broken stone blind ditch and the PE permeable pipe in order to be discharged, the reinforcement of the bottom plate structure and the concrete pouring are carried out after the drainage, and the whole pre-buried pit is sealed after the concrete strength of the bottom plate.
The construction method for the underground water buried drainage of the deep foundation pit has the advantages of being scientific and reasonable in design steps and strong in operability, solving the technical problem of water lowering of the deep foundation pit with water in a sand layer and removing the harm of abundant underground water under the deep foundation pit to engineering.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.

Claims (9)

1. A construction method for underground water buried drainage of a deep foundation pit is characterized by comprising the following steps:
a. prefabricated embedded dry well
Pre-manufacturing an embedded dry pit, wherein the dry pit comprises a drain pipe and a dry pit body, the drain pipe is embedded into a structural part of a concrete bottom plate to be constructed, the dry pit body collects the water permeating from the bottom of the dry pit, and a water pump is arranged at the bottom of the dry pit and discharges the water permeating out of a foundation pit through the drain pipe; the dry pit body is arranged at the center of the permeable section, when the dry pit body is excavated to the water gushing position at the bottom of the foundation pit, a drainage part is quickly excavated, the permeable part at the bottom of the dry pit is pressed at the water gushing position at the bottom of the foundation pit, then broken stones are filled in the periphery of the dry pit for water filtration, regularly arranged blind ditches are radially excavated, PE permeable pipes with full filter holes are buried in the blind ditches, broken stones are filled in the periphery of the permeable pipes to form mutually communicated permeable blind ditches, and concrete cushion layers are poured after water-resisting films are covered on the upper parts of the blind ditches;
b. pre-buried drain pipe of mounting base plate structure
The method comprises the following steps that a drain pipe is embedded in an installation bottom plate structure, the diameter of the drain pipe is slightly larger than the maximum diameter part of a water pump so that the water pump can be placed at the bottom of an upland well body through the drain pipe, a round steel plate matched with the top end of the upland well body and having the same inner diameter is arranged at the bottom end of the drain pipe, a reinforcing rib plate is arranged on the round steel plate to increase the rigidity of the round steel plate, a plurality of water stop rings are arranged on the length direction of a pipe body of the drain pipe to be used for structural waterproofing, the round steel plate is;
c. drainage and drainage of underground water buried dry well of deep foundation pit
Arrange the water pump from bottom plate structure drain pipe upper mouth department, water pump stay cord and cable are fixed respectively on the lantern ring of drain pipe upper mouth outer fringe, open the groundwater that the water pump upwelled in the foundation ditch bottom after carrying out the drainage can be discharged in the pre-buried drought well through rubble french drain, the orderly inflow of PE pipe of permeating water, carry out bottom plate structure reinforcement and concrete and pour after the drainage, carry out the whole seal of pre-buried well after bottom plate structure concrete strength is up to standard.
2. The deep foundation pit underground water buried drainage construction method according to claim 1, wherein the blind ditches are arranged around the dry well body.
3. The deep foundation pit underground water buried drainage construction method according to claim 1 or 2, wherein the blind ditches are annularly arranged with the dry well body as a center.
4. The deep foundation pit underground water buried drainage construction method according to claim 1 or 2, wherein the blind ditch is arranged in a cross shape with the dry well body as the center.
5. The deep foundation pit underground water buried drainage construction method according to claim 1 or 2, wherein the water pump is a submersible pump.
6. The deep foundation pit underground water buried drainage construction method according to claim 1 or 2, wherein the whole embedded well is sealed after the concrete strength of the bottom plate structure reaches more than or equal to 75%.
7. The deep foundation pit underground water buried drainage construction method according to claim 1 or 2, wherein the number of the pre-buried dry wells is determined according to working condition requirements.
8. The construction method for the underground water burial drainage of the deep foundation pit according to the claim 1 or 2, wherein when the water permeable part at the bottom of the dry pit is pressed at the water gushing position at the bottom of the foundation pit, a temporary drainage pump is arranged for draining water according to the water gushing condition so as to control the water level of the basement underground.
9. The deep foundation pit underground water buried drainage construction method according to claim 1 or 2, wherein a water-resisting film is laid below the concrete cushion layer when the bottom plate structure concrete is poured.
CN201911103089.3A 2019-11-12 2019-11-12 Construction method for drainage of underground water of deep foundation pit Pending CN110847199A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111705820A (en) * 2020-05-25 2020-09-25 浙江明康工程咨询有限公司 Ultra-large type deep foundation pit drainage system
CN112281882A (en) * 2020-10-25 2021-01-29 中铁十二局集团有限公司 Method for treating water and sand gushing from substrate
CN113445525A (en) * 2021-09-01 2021-09-28 中铁十八局集团第五工程有限公司 Method and structure for controlling water pressure of bottom plate in construction of bottom plate of foundation pit of deep foundation pit

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CN207193996U (en) * 2017-08-31 2018-04-06 中国一冶集团有限公司 A kind of precipitation pipe well well-sealing device
CN109440775A (en) * 2018-12-27 2019-03-08 云南省建设投资控股集团有限公司 A kind of sunk type foundation pit Yield rainfall relation system, construction method and application method

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Publication number Priority date Publication date Assignee Title
JP2009263971A (en) * 2008-04-24 2009-11-12 Taisei Corp Construction method for temporary structure and underground structure
CN103046565A (en) * 2011-10-17 2013-04-17 五冶集团上海有限公司 Draining method for ultra-deep batholith deep foundation pit
CN104060622A (en) * 2014-07-14 2014-09-24 云南建工第四建设有限公司 Method for discharging water in pint through steel bucket in pit
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111705820A (en) * 2020-05-25 2020-09-25 浙江明康工程咨询有限公司 Ultra-large type deep foundation pit drainage system
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CN112281882A (en) * 2020-10-25 2021-01-29 中铁十二局集团有限公司 Method for treating water and sand gushing from substrate
CN113445525A (en) * 2021-09-01 2021-09-28 中铁十八局集团第五工程有限公司 Method and structure for controlling water pressure of bottom plate in construction of bottom plate of foundation pit of deep foundation pit

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