CN110939149B - Foundation pit water-resisting and water-reducing method - Google Patents
Foundation pit water-resisting and water-reducing method Download PDFInfo
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- CN110939149B CN110939149B CN201911282667.4A CN201911282667A CN110939149B CN 110939149 B CN110939149 B CN 110939149B CN 201911282667 A CN201911282667 A CN 201911282667A CN 110939149 B CN110939149 B CN 110939149B
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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
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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
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
Abstract
The invention relates to the technical field of building construction, in particular to a method for preventing water and water in a foundation pit, which comprises the following steps: determining a construction scheme; after well points are distributed, a pipe well is arranged at the well point; pumping water to the pipe well through a water pumping pipeline by a water pumping pump until the water level of the pipe well is lowered to meet the construction requirement; pumping out a water pumping pipeline in the pipe well, and inserting a refrigerating pipeline into the water pumping pipeline, wherein the refrigerating pipeline is used for refrigerating the pipe well; the freezing foundation pit dewatering structure is formed by freezing the pipe well and the periphery through the refrigeration pipeline, and water in soil is frozen through freezing, so that a seepage-proof structure is formed, the functions of supporting and water proofing are realized, and the foundation engineering operation is ensured.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a foundation pit water-resisting and water-reducing method.
Background
For a long time, most foundation pits adopt well points for dewatering, so that serious water resource waste is caused. In order to protect underground water resources, a curtain water-resisting method is adopted to prevent underground water from entering a construction area. Meanwhile, the urban construction land is short, the distance between surrounding buildings is compact, and a curtain water-proof mode is also commonly adopted for ensuring safety. Therefore, the curtain water-proof is the main mode of precipitation construction of future projects. However, when the curtain water-proof method is adopted for dewatering construction, the foundation pit range is affected by factors such as reverse osmosis water, construction dewatering in rainy period and the like due to excessive water storage and underground water pressure, and a large amount of water accumulation still exists at the bottom of the foundation pit and the foundation trench, so that a new problem is brought to construction.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the foundation pit water-resisting and water-reducing method can reduce water resource waste and improve foundation pit safety.
In order to solve the technical problems, the invention adopts the technical scheme that: a foundation pit water-resisting and water-reducing method comprises the following steps:
firstly, measuring and setting out, arranging well points, and determining the distance, the number and the depth of the well point arrangement according to a calculation and construction scheme;
step two, after well points are distributed, pipe wells are arranged at the well points;
thirdly, pumping water to the pipe well through a water pumping pipeline by a water pumping pump until the water level of the pipe well is lowered to meet the construction requirement;
step four, selecting a part of water pumping pipelines in the pipe well which meet the construction requirements to pump out, inserting a refrigeration pipeline into the water pumping pipelines, distributing the water pumping pipelines and the refrigeration pipelines in the pipe well at the well point position in a staggered manner, and setting the pipe well of the water pumping pipeline to continuously pump water; the refrigeration pipeline performs a first refrigeration action on the pipe well;
and fifthly, when the temperature of the lowest part of the pipe well provided with the water pumping pipeline is lower than 5 ℃, taking out the water pumping pipelines in the remaining pipe wells provided with the water pumping pipelines, replacing the water pumping pipelines with refrigeration pipelines, performing a second refrigeration action, forming a freezing foundation pit dewatering structure after freezing, and keeping the formed freezing foundation pit dewatering structure at the temperature of between 50 ℃ below zero and 18 ℃ below zero.
The invention has the beneficial effects that: the pipe well and the periphery of the pipe well are frozen through the refrigeration pipeline to form a refrigeration foundation pit dewatering structure, moisture in soil is frozen through refrigeration, so that a seepage-proof structure is formed, the functions of supporting and water proofing are achieved, the foundation engineering operation is guaranteed, meanwhile, the distribution arrangement of the refrigeration pipeline is realized in the four steps and the five steps, and the water level rising caused by the fact that the refrigeration pipeline is not timely cooled is avoided; meanwhile, more stable support can be realized through the increase of the volume of water during freezing; the foundation pit dewatering step is reasonable in design and simple to operate; the method is simple and convenient to construct; after the engineering is finished, the ice blocks can be melted into water through unfreezing, so that soil and a water layer cannot be polluted, no residue is generated, and the environment is protected.
Drawings
Fig. 1 is a schematic structural diagram of a foundation pit after water pumping action by a foundation pit water-resisting and water-reducing method according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a foundation pit after a second refrigeration action in a foundation pit water-resisting and water-reducing method according to an embodiment of the invention;
description of reference numerals: 1. a foundation pit; 2. a pipe well; 3. a sub pit; 4. a water pumping pipeline; 5. a refrigeration pipeline; 6. a ground surface; 7. an original water line; 8. a post precipitation waterline; 9. a post-freezing water line; 10. a water pump.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The most key concept of the invention is as follows: the freezing foundation pit dewatering structure formed by freezing the pipe well and the periphery through the refrigerating pipeline enables moisture in soil to freeze through freezing, so that a seepage-isolating structure is formed, the functions of supporting and water proofing are realized, and foundation engineering operation is guaranteed.
A foundation pit water-resisting and water-reducing method comprises the following steps:
firstly, measuring and setting out, arranging well points, and determining the distance, the number and the depth of the well point arrangement according to a calculation and construction scheme;
step two, after well points are distributed, pipe wells are arranged at the well points;
thirdly, pumping water to the pipe well through a water pumping pipeline by a water pumping pump until the water level of the pipe well is lowered to meet the construction requirement;
step four, selecting a part of water pumping pipelines in the pipe well which meet the construction requirements to pump out, inserting a refrigeration pipeline into the water pumping pipelines, distributing the water pumping pipelines and the refrigeration pipelines in the pipe well at the well point position in a staggered manner, and setting the pipe well of the water pumping pipeline to continuously pump water; the refrigeration pipeline performs a first refrigeration action on the pipe well;
and fifthly, when the temperature of the lowest part of the pipe well provided with the water pumping pipeline is lower than 5 ℃, taking out the water pumping pipelines in the remaining pipe wells provided with the water pumping pipelines, replacing the water pumping pipelines with refrigeration pipelines, performing a second refrigeration action, forming a freezing foundation pit dewatering structure after freezing, and keeping the formed freezing foundation pit dewatering structure at the temperature of between 50 ℃ below zero and 18 ℃ below zero.
From the above description, the beneficial effects of the present invention are: the pipe well and the periphery of the pipe well are frozen through the refrigeration pipeline to form a refrigeration foundation pit dewatering structure, moisture in soil is frozen through refrigeration, so that a seepage-proof structure is formed, the functions of supporting and water proofing are achieved, the foundation engineering operation is guaranteed, meanwhile, the distribution arrangement of the refrigeration pipeline is realized in the four steps and the five steps, and the water level rising caused by the fact that the refrigeration pipeline is not timely cooled is avoided; meanwhile, more stable support can be realized through the increase of the volume of water during freezing; the foundation pit dewatering step is reasonable in design and simple to operate; the method is simple and the construction is simple.
The lowest position of the pipe well provided with the water pumping pipeline is certainly a place containing water, the water has certain fluidity, the temperature of the lowest position, generally the lowest temperature position of the pipe well, of the adjacent pipe well begins to freeze, the freezing of a water pipe is avoided, and at the temperature of 5 ℃, the temperature of the pipe well of the water pumping pipeline is continuously reduced, so that the situation that the water pumping pipeline is frozen in the pipe well due to untimely replacement is avoided; the formed freezing foundation pit dewatering structure is kept below 18 ℃ below zero, so that the moisture of the surrounding soil is frozen and expanded, meanwhile, the structure formed by the gas in the soil and the gas in the water due to the ice crystal structure is more fragile, and when the freezing foundation pit dewatering structure expands to the surrounding soil, the surrounding soil and the underground water are extruded towards the ice direction, so that the ice density is higher, and the structure is more compact; in addition, the hydration of water fails through icing, so that the gas of the water is discharged, and the sufficient thickness and bearing capacity of the precipitation structure are ensured; meanwhile, the gas in water can be conveniently discharged by freezing in a sectional manner, so that the phenomenon that the gas is fixed in ice to form bubbles due to too rapid cooling is avoided, and the rigidity of an ice layer is improved; meanwhile, the temperature is reduced to be below-18 ℃, so that the biological activity can be reduced, the ice layer melting caused by psychrophilic biological activity is reduced, excessive cold sources are not needed for freezing, and the cost is saved.
Further, the second step includes:
after well points are distributed, a pipe well is arranged at the well point; an auxiliary pit is also arranged on one side, which is positioned between the adjacent pipe wells and is far away from the foundation pit; and reinforcing columns are filled in the auxiliary pits, are rigid columns and are connected with each other.
As can be seen from the above description, the auxiliary pit and two adjacent auxiliary pits form a triangular structure through the rigid reinforcing columns, so that the stability of the whole foundation pit can be improved; and the whole wave structure that forms for the resistance grow that the rivers around pass through, and then reduce the velocity of flow, reduce the speed of heat exchange then, guarantee the stability of structure, reduce the demand of cold source, practice thrift the cost.
Further, the method also comprises the following steps:
and step six, taking out the reinforcing column from the auxiliary pit, injecting the original water taken out from the pipe well, inserting a refrigeration pipeline into the auxiliary pit, and refrigerating.
From the above description, through the water injection for this structure is in freezing back, and the freezing foundation ditch precipitation structure of formation is more stable, can make the original water of taking out realize cyclic utilization simultaneously, and the cockscomb structure border that forms can shunt to frozen tube well direction towards the extruded moisture of foundation ditch, makes the frozen layer more firm.
Further, an inflatable ball body is arranged between the bottom of the reinforcing column and the bottom of the auxiliary pit, and the diameter of the inflatable ball body is 8cm-24 cm.
From the above description, it can be known that, through the inflatable ball, when the reinforcing column is taken out, because the reinforcing column has the possibility of freezing, when freezing, the reinforcing column is knocked from the upper part of the reinforcing column, so that the side wall of the reinforcing column is separated from the inner side wall of the auxiliary pit, and the reinforcing column is taken out conveniently.
Further, the first cooling action includes:
firstly, precooling, wherein the temperature of a refrigerating pipeline is kept between-18 ℃ and-12 ℃ until the thickness of ice on the surface of the refrigerating pipeline exceeds 2 cm;
and step two, quenching, namely cooling at the speed of 10 ℃/min to reduce the temperature of the refrigeration pipeline to-100 ℃.
From the above description, it can be seen that the rapid rise of the water level is avoided by the first refrigeration action, and at the same time, when the water pumping is just finished, the water contains a large amount of air, the ice thickness of the frozen water exceeds 2cm through the surface of the refrigeration pipeline to avoid rapid freezing, so that the strength of the ice formed by the frozen water is insufficient, and the ice forming can be more stable by keeping the temperature of the refrigeration pipeline at-18 ℃ to-12 ℃ and the ice thickness of the frozen water exceeds 2cm to allow the water at the bottom to have enough time to be stood for precipitation and then rapidly frozen.
Further, the second cooling action includes:
the refrigeration pipeline is inserted into the pipe well at the temperature of 5 ℃, and then cooled at the speed of 5 ℃/min after being inserted, and the temperature of the refrigeration pipeline is reduced to-100 ℃ after being kept at 0 ℃ for 3 minutes.
From the above description, it can be known that, because the temperature of the pumping wells on both sides is already low, and after the first refrigeration action, the water is kept at 0 ℃ for 3 minutes, and in the three minutes, the water is in a three-phase state, and because the change of crystal lattices and the loss of hydration are weakened, the gas and impurities in the water can be discharged as much as possible, and because the content of the impurities is reduced, the further rapid cooling and icing can be facilitated.
After the first refrigeration and the second refrigeration are finished, the ice layer can be over-expanded and formed and then loses the outer layer part by firstly reducing the temperature to-100 ℃ and increasing the temperature to-18 ℃, the over-expanded and formed ice layer can extrude the inside of the ice layer, and further the density of the inside of the ice layer is improved, and the ice layer is expanded outwards by taking the refrigeration pipe as the center, so that the density of the ice layer closer to the refrigeration pipe is higher, the gas content is lower, and the stability of the structure is further facilitated; and the space flowing down after the portion outside the ice layer is lost is supplemented by the flow of water, thereby being more easily formed.
Furthermore, water needs to be pumped in a trial manner before the water pumping action.
Example one
Referring to fig. 1 and 2, a method for preventing water and water from falling in a foundation pit 1 comprises the following steps:
1-1, measuring and setting out, arranging well points, and determining the distance, the number and the depth of the well point arrangement according to a calculation and construction scheme;
1-2, after well points are distributed, arranging a pipe well 2 at the well point position around the foundation pit 1; a secondary pit 3 is also arranged on one side of the well, which is positioned between the adjacent pipe wells 2 and is far away from the foundation pit 1; reinforcing columns are filled in the auxiliary pit 3, the reinforcing columns are rigid columns, and the adjacent reinforcing columns are connected with each other; an inflatable ball body is arranged between the bottom of the reinforcing column and the bottom of the auxiliary pit 3, and the diameter of the inflatable ball body is 16 cm;
1-3, trial pumping water through a water pumping pipeline 4 by a water pumping pump;
1-4, pumping water to the pipe well 2 until the water level of the pipe well 2 is lowered from an original water level line 7 to a water level line 8 after precipitation, wherein the water level line 8 after precipitation meets the construction requirement;
1-5, selecting a part of water pumping pipelines 4 in the pipe well 2 which meets the construction requirements to pump out, inserting a refrigeration pipeline 5 into the water pumping pipelines 4, distributing the water pumping pipelines 4 and the refrigeration pipelines 5 in the pipe well 2 at the well point position in a staggered manner, and setting the pipe well 2 of the water pumping pipeline 4 to continuously pump water;
1-6, precooling, and keeping the temperature of the refrigerating pipeline 5 at-18 ℃ until the thickness of ice on the surface of the refrigerating pipeline 5 exceeds 2 cm;
1-7, quenching, cooling at 10 ℃/min, and reducing the temperature of the refrigeration pipeline 5 to-100 ℃.
1-8, when the temperature of the lowest part of the pipe well 2 provided with the water pumping pipeline 4 is lower than 5 ℃, the water pumping pipeline 4 in the pipe well 2 with the residual water pumping pipeline 4 is taken out and replaced by a refrigerating pipeline 5, the refrigerating pipeline 5 is inserted into the pipe well 2 in a state of 5 ℃ in temperature, after the insertion, the refrigerating pipeline is cooled at 5 ℃/min, the temperature of the refrigerating pipeline is reduced to-100 ℃ after the refrigerating pipeline is kept for 3 minutes at 0 ℃, a freezing foundation pit 1 precipitation structure and a freezing post-water level line 9 are formed after freezing, and the formed freezing foundation pit 1 precipitation structure keeps the temperature of-50 ℃.
1-9, taking out the reinforcing column in the auxiliary pit 3, injecting the original water taken out from the tube well 2, and simultaneously inserting the refrigeration pipeline 5 into the auxiliary pit 3 for refrigeration.
Example two
A foundation pit water-resisting and water-reducing method comprises the following steps:
2-1, measuring and setting out, arranging well points, and determining the distance, the number and the depth of the well point arrangement according to a calculation and construction scheme;
2-2, after well points are distributed, arranging a pipe well 2 at the well point position around the foundation pit 1;
2-3, trial pumping water through a water pumping pipeline 4 by a water pumping pump;
2-4, pumping water to the pipe well 2 until the water level of the pipe well 2 is lowered from the original water level line 7 to a water level line 8 after precipitation, wherein the water level line 8 after precipitation meets the construction requirement;
2-5, selecting a part of water pumping pipelines 4 in the pipe well 2 which meets the construction requirements to pump out, inserting a refrigeration pipeline 5 into the water pumping pipelines 4, distributing the water pumping pipelines 4 and the refrigeration pipelines 5 in the pipe well 2 at the well point position in a staggered manner, and setting the pipe well 2 of the water pumping pipeline 4 to continuously pump water;
2-6, precooling, and keeping the temperature of the refrigerating pipeline 5 at-18 ℃ until the thickness of ice on the surface of the refrigerating pipeline 5 exceeds 2 cm;
2-7, quenching, cooling at 10 ℃/min, and reducing the temperature of the refrigeration pipeline 5 to-100 ℃.
2-8, when the temperature of the lowest part of the pipe well 2 provided with the water pumping pipeline 4 is lower than 5 ℃, taking out the water pumping pipeline 4 in the pipe well 2 with the residual water pumping pipeline 4, replacing the water pumping pipeline 4 with a refrigerating pipeline 5, inserting the refrigerating pipeline 5 into the pipe well 2 in a state of 5 ℃, cooling the refrigerating pipeline 5 at a speed of 5 ℃/min after insertion, and lowering the temperature of the refrigerating pipeline 5 to-100 ℃, so that a precipitation structure of the freezing foundation pit 1 is formed after freezing, and the formed precipitation structure of the freezing foundation pit 1 is kept at a temperature of-18 ℃.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (7)
1. A foundation pit water-resisting and water-reducing method is characterized by comprising the following steps:
firstly, measuring and setting out, arranging well points, and determining the distance, the number and the depth of the well point arrangement according to a calculation and construction scheme;
step two, after well points are distributed, pipe wells are arranged at the well points;
thirdly, pumping water to the pipe well through a water pumping pipeline by a water pumping pump until the water level of the pipe well is lowered to meet the construction requirement;
step four, selecting a part of water pumping pipelines in the pipe well which meet the construction requirements to pump out, inserting a refrigeration pipeline into the water pumping pipelines, distributing the water pumping pipelines and the refrigeration pipelines in the pipe well at the well point position in a staggered manner, and setting the pipe well of the water pumping pipeline to continuously pump water; the refrigeration pipeline performs a first refrigeration action on the pipe well;
and fifthly, when the lowest temperature of the pipe well provided with the water pumping pipeline is lower than 5 ℃, taking out the water pumping pipelines in the remaining pipe wells provided with the water pumping pipelines and replacing the water pumping pipelines with refrigeration pipelines, performing a second refrigeration action, forming a freezing foundation pit dewatering structure after freezing, and keeping the formed freezing foundation pit dewatering structure at the temperature of-50 ℃ to-18 ℃.
2. The method for resisting water and lowering water in the foundation pit according to claim 1, wherein the second step comprises the following steps:
after well points are distributed, a pipe well is arranged at the well point; an auxiliary pit is also arranged on one side, which is positioned between the adjacent pipe wells and is far away from the foundation pit; and reinforcing columns are filled in the auxiliary pits, are rigid columns and are connected with each other.
3. The method for resisting water and lowering water in the foundation pit according to claim 2, further comprising:
and step six, taking out the reinforcing column from the auxiliary pit, injecting the original water taken out from the pipe well, inserting a refrigeration pipeline into the auxiliary pit, and refrigerating.
4. The foundation pit water-resisting and water-reducing method according to claim 2, wherein an inflatable sphere is arranged between the bottom of the reinforcing column and the bottom of the auxiliary pit, and the diameter of the inflatable sphere is 8cm-24 cm.
5. The method of claim 1, wherein the first cooling action comprises:
firstly, precooling, wherein the temperature of a refrigeration pipeline is kept between-18 ℃ and-12 ℃;
and step two, quenching, namely cooling at the speed of 10 ℃/min to reduce the temperature of the refrigeration pipeline to-100 ℃.
6. The method of claim 1, wherein the second cooling action comprises:
the refrigeration pipeline is inserted into the pipe well at the temperature of 5 ℃, and then cooled at the speed of 5 ℃/min after being inserted, and the temperature of the refrigeration pipeline is reduced to-100 ℃ after being kept at 0 ℃ for 3 minutes.
7. The method for resisting water and lowering water in the foundation pit according to claim 1, wherein water is required to be pumped in a trial manner before the water pumping action.
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| CN202610820U (en) * | 2012-02-24 | 2012-12-19 | 中国科学院寒区旱区环境与工程研究所 | Structure for preventing water in permafrost from gathering at foundation pit by using water shield boxes |
| CN105951861A (en) * | 2016-06-24 | 2016-09-21 | 北京城建集团有限责任公司 | Lateral freezing bottom-making water stop structure for underground excavated foundation pit of urban sensitive area and method |
| CN207794115U (en) * | 2018-01-30 | 2018-08-31 | 青岛瑞源工程集团有限公司 | A kind of recyclable water sealing structure of foundation pit freezing supporting |
| CN108797617A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of piled anchor and liquid nitrogen frozen soil wall composite support implementation and its supporting construction |
| CN108797604A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of protection network and liquid nitrogen frozen soil wall composite support implementation and its supporting construction |
| JP2019108766A (en) * | 2017-12-20 | 2019-07-04 | 東京電力ホールディングス株式会社 | Maintenance method of frozen soil and construction method of frozen soil |
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2019
- 2019-12-13 CN CN201911282667.4A patent/CN110939149B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202610820U (en) * | 2012-02-24 | 2012-12-19 | 中国科学院寒区旱区环境与工程研究所 | Structure for preventing water in permafrost from gathering at foundation pit by using water shield boxes |
| CN105951861A (en) * | 2016-06-24 | 2016-09-21 | 北京城建集团有限责任公司 | Lateral freezing bottom-making water stop structure for underground excavated foundation pit of urban sensitive area and method |
| JP2019108766A (en) * | 2017-12-20 | 2019-07-04 | 東京電力ホールディングス株式会社 | Maintenance method of frozen soil and construction method of frozen soil |
| CN207794115U (en) * | 2018-01-30 | 2018-08-31 | 青岛瑞源工程集团有限公司 | A kind of recyclable water sealing structure of foundation pit freezing supporting |
| CN108797617A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of piled anchor and liquid nitrogen frozen soil wall composite support implementation and its supporting construction |
| CN108797604A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of protection network and liquid nitrogen frozen soil wall composite support implementation and its supporting construction |
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Effective date of registration: 20221221 Address after: 241000 Building 91, Chengdong New City, Anhui Xinwu Economic Development Zone, Wanlu District, Wuhu City, Anhui Province Patentee after: China Construction Fourth Engineering Bureau Wuhu Construction Investment Co.,Ltd. Address before: 350206 No.82, Laobo District, Shimen village, Jiangtian Town, Changle City, Fuzhou City, Fujian Province Patentee before: Chen Zhongxiang |
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