CN111593771A - Construction method of anti-floating decompression system of basement bottom plate - Google Patents
Construction method of anti-floating decompression system of basement bottom plate Download PDFInfo
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- CN111593771A CN111593771A CN202010255255.8A CN202010255255A CN111593771A CN 111593771 A CN111593771 A CN 111593771A CN 202010255255 A CN202010255255 A CN 202010255255A CN 111593771 A CN111593771 A CN 111593771A
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- 238000007667 floating Methods 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 230000006837 decompression Effects 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 111
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 90
- 239000010959 steel Substances 0.000 claims description 90
- 238000003466 welding Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000003673 groundwater Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 4
- 241001289721 Lethe Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective 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 soil pressure or hydraulic pressure
- E02D31/12—Protective 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 soil pressure or hydraulic pressure against upward hydraulic pressure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a construction method of an anti-floating decompression system of a basement bottom plate, and discloses a construction method of an anti-floating decompression system of a raft of a basement foundation. When the underground water pressure reaches a certain pressure, the system starts the self drainage system to automatically drain water, so that the aim of reducing the water pressure borne by the bottom plate of the ground reservoir is fulfilled. The water pressure is monitored through the water pressure meter, and when the water pressure meets the anti-floating design requirement, the side water stop valve is opened, so that the aim of reducing pressure and resisting floating is fulfilled. By the method, a dewatering pump is not needed for pumping water, and the engineering cost is reduced.
Description
Technical Field
The invention relates to a construction method of a raft anti-floating decompression system of a basement foundation, in particular to a construction method of a raft foundation anti-floating decompression system in a region with abundant underground water and with a small anti-floating design value.
Background
At present, in the field of on-site building construction, the structural building with the basement adopting the raft foundation can consider the anti-floating design of the basement in the design process. In the actual construction process, the retention and the plugging of the foundation pit dewatering well are weak links of the anti-floating design of the structure. When the traditional dewatering well is sealed, the underground water level is lowered to 500mm below the elevation of a base generally during basic construction, and dewatering can be stopped after the construction of the top of the first floor of the tower is finished and the earth covering of the top and the bottom of an underground chamber is finished. For the group residence projects, the basement area is large, the number of precipitation wells is large, and particularly in the areas with abundant underground water, the precipitation pump in the precipitation well can work continuously, the precipitation time is long, and the cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a construction method of a basement bottom plate anti-floating decompression system, wherein the construction method of the basement bottom plate anti-floating decompression system is used for overcoming the potential quality safety hazard caused by the influence of buoyancy on a basement foundation raft plate generated by well sealing in advance.
A construction method of an anti-floating decompression system of a raft of a basement foundation comprises the following steps:
the method comprises the following steps of firstly, processing the steel sleeve structure, and specifically:
firstly, welding an external water stop ring on the steel sleeve along the circumferential direction of the outer wall of the lower part of the steel sleeve, and welding an internal water stop ring on the inner wall of the steel sleeve above the external water stop ring along the circumferential direction of the inner wall of the steel sleeve;
secondly, arranging a filter plate on the inner wall of the steel sleeve above the internal water stop ring, wherein the filter plate comprises a lower steel plate provided with a water drainage hole and an upper steel plate which is arranged above the lower steel plate and provided with the water drainage hole, and tree-brown is filled between the lower steel plate and the upper steel plate;
thirdly, the outer edges of the upper layer steel plate and the lower layer steel plate of the filter plate are respectively fixed with the inner wall of the steel sleeve in a full welding mode in the circumferential direction;
fourthly, welding a steel cover plate, which is communicated with a middle water pipe on the top wall, on the top wall of the steel sleeve along the horizontal direction, and welding a lateral water pipe to the position of the opening on the side wall of the top of the steel sleeve so that the water inlets of the lateral water pipes are communicated with the opening on the top of the steel sleeve;
step two, sleeving the lower part of the steel sleeve on the outer wall of the upper part of the constructed basement dewatering well along the vertical direction, fixing the outer part of the steel sleeve at the position below the bottom surface of bedding concrete by adopting soil, and then pouring the bedding concrete at the lower part of the set basement raft position;
step three, binding bottom plate steel bars on the cushion layer concrete and pouring raft plate concrete;
after the strength of the raft plate concrete reaches 100%, respectively installing a pressure gauge and a first water stop valve at a water inlet close to the side water pipe, installing a second water stop valve on the middle water pipe, and respectively communicating the water outlets of the middle water pipe and the side water pipe with a drain pipe;
step five, opening a second water stop valve, allowing groundwater to enter a steel sleeve from a dewatering well under the action of underground water pressure, discharging the discharged water to an on-site water collecting well through a water discharging pipe, filtering sand, stones and impurities in the water by using tree palm in a filter plate, and opening the first water stop valve to release pressure when the numerical value of a pressure gauge reaches a designed anti-floating pressure value;
sixthly, after the well sealing condition is achieved, cutting and removing the steel cover plate, the side water pipe and the filter plate, and sealing an opening on the side wall of the top of the steel sleeve;
pumping the water level to 500mm below the bottom surface of the bedding concrete by using a water pump, and filling a plugging material into the steel sleeve to 200mm below the bottom surface of the bedding concrete; pouring micro-expansion waterproof concrete on the upper part of the plugging material to the position below the inner water stop ring, and welding the inner water stop ring with a steel plate;
and step eight, pouring concrete into the steel sleeve at the upper part of the steel plate, and completing well sealing.
Compared with the prior art, the invention has the advantages that: the construction method of traditional dewatering well drainage is cancelled, underground water pressure is utilized, underground water is drained in a dredging and non-blocking mode, and the risk that the basement raft floats upwards or even is damaged due to the fact that underground water pressure is too high is effectively avoided through the drainage port with the pressure gauge. The system has the functions of drainage and anti-floating decompression. When the underground water pressure reaches a certain pressure, the system starts the self drainage system to automatically drain water, so that the aim of reducing the water pressure applied to the bottom plate of the basement and preventing the basement and the bottom plate from floating upwards is fulfilled.
Drawings
FIG. 1 is a cross-sectional view of an anti-floating system employing the present invention;
FIG. 2 is a top view of a filter plate in the system shown in FIG. 1;
fig. 3 is a cross-sectional view of a filter plate in the system shown in fig. 1.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in the attached drawings 1-3, the invention relates to a construction method of an anti-floating decompression system of a foundation raft of an underground chamber, which comprises the following steps:
the method comprises the following steps of firstly, processing the steel sleeve structure, and specifically:
firstly, welding an external water stop ring 5 on a steel sleeve 2 along the circumferential direction of the outer wall of the lower part of the steel sleeve 2, and welding an internal water stop ring 6 on the inner wall of the steel sleeve 2 above the external water stop ring 5 along the circumferential direction of the inner wall of the steel sleeve 2;
secondly, a filter plate 7 is arranged on the inner wall of the steel sleeve 2 above the internal water stop ring 6, the filter plate comprises a lower steel plate 7-2 provided with a water drainage hole 7-1 and an upper steel plate 7-4 which is arranged above the lower steel plate 7-2 and provided with the water drainage hole, and tree palm 7-3 is filled between the lower steel plate 7-2 and the upper steel plate 7-4; preferably, the lower steel plate 7-2 and the upper steel plate 7-4 are conical, and the conical shape can be used for enabling silt in water to move towards the direction of the pipe wall through water pressure, so that the filtering load of the filtering layer is reduced.
Thirdly, the outer edges of the upper steel plate 7-4 and the lower steel plate 7-2 of the filter plate 7 are respectively fixed with the inner wall of the steel sleeve 2 in a full welding mode in the circumferential direction;
fourthly, welding the steel cover plate 10 with the middle water pipe 12-1 communicated with the top wall on the top wall of the steel sleeve 2 along the horizontal direction, and welding a lateral water pipe 12-2 to the opening of the side wall of the top of the steel sleeve 2 to enable the water inlet of the lateral water pipe 12-2 to be communicated with the opening of the top of the steel sleeve 2.
Step two, sleeving a hoop at the lower part of the steel sleeve 2 on the outer wall of the upper part of the constructed basement dewatering well 1 along the vertical direction (usually, the lapping length of the steel sleeve and the lapping length of the steel sleeve are 300mm), fixing the outer part of the steel sleeve below the bottom surface of bedding concrete (the position is set according to the construction design in advance) by adopting soil, and then pouring bedding concrete 3 at the lower part of the set position of the basement raft;
and step three, binding bottom plate steel bars on the cushion layer concrete 3 and pouring raft plate concrete 4.
After the strength of the raft plate concrete reaches 100%, respectively installing a pressure gauge 9 and a first water stop valve 8-1 at a water inlet close to the side water pipe 12-2, installing a second water stop valve 11 on the middle water pipe 12-1, and respectively communicating the water outlets of the middle water pipe 12-1 and the side water pipe 12-2 with a water drainage pipe 13;
and step five, opening a second water stop valve 11, allowing groundwater to enter the steel sleeve 2 from the dewatering well under the action of the underground water pressure, discharging the discharged water to the field water collecting well through a water discharge pipe 13, filtering sand, stones and impurities in the water by using tree palm 7-3 in the filter plate 7, and opening the first water stop valve 8 to release the pressure when the numerical value of the pressure gauge 9 reaches a designed anti-floating pressure value so as to ensure the integral anti-floating effect of the basement.
Step six, after the well sealing condition (completion of earth backfilling of a top plate of the basement, completion of a ground surface layer of a basement floor and completion of a main structure) is achieved, cutting and removing the steel cover plate 10, the side water pipes 12-2 and the filter plate 7, and plugging the open holes in the side wall of the top of the steel sleeve 2;
and step seven, pumping the water level to 500mm below the bottom surface of the bedding concrete by using a water pump, and filling plugging materials (clay balls) into the steel sleeve to 200mm below the bottom surface of the bedding concrete. Pouring micro-expansion waterproof concrete on the upper part of the plugging material to the position below the inner water stop ring 6, and welding the micro-expansion waterproof concrete with the inner water stop ring 6 by using a steel plate;
and step eight, pouring concrete into the steel sleeve 2 at the upper part of the steel plate, and completing well sealing.
Claims (2)
1. A construction method of an anti-floating decompression system of a raft of an underground chamber foundation is characterized by comprising the following steps:
the method comprises the following steps of firstly, processing the steel sleeve structure, and specifically:
firstly, welding an external water stop ring (5) on the steel sleeve along the circumferential direction of the outer wall of the lower part of the steel sleeve (2), and welding an internal water stop ring on the inner wall of the steel sleeve above the external water stop ring along the circumferential direction of the inner wall of the steel sleeve;
secondly, a filter plate (7) is arranged on the inner wall of the steel sleeve above the internal water stop ring (6), the filter plate comprises a lower steel plate (7-2) provided with a water drainage hole (7-1) and an upper steel plate (7-4) which is arranged above the lower steel plate and provided with the water drainage hole, and tree palm (7-3) is filled between the lower steel plate and the upper steel plate;
thirdly, the outer edges of the upper layer steel plate and the lower layer steel plate of the filter plate are respectively fixed with the inner wall of the steel sleeve in a full welding mode in the circumferential direction;
fourthly, welding a steel cover plate (10) which is communicated with a middle water pipe (12-1) on the top wall of the steel sleeve along the horizontal direction, and welding a lateral water pipe (12-2) to the position of the opening on the lateral wall of the top of the steel sleeve so that the water inlet of the lateral water pipe is communicated with the opening on the top of the steel sleeve;
step two, sleeving the lower part of the steel sleeve on the outer wall of the upper part of the constructed basement dewatering well along the vertical direction, fixing the outer part of the steel sleeve at the position below the bottom surface of bedding concrete by adopting soil, and then pouring bedding concrete (3) at the lower part of the set basement raft position;
step three, binding bottom plate steel bars on the cushion layer concrete and pouring raft plate concrete (4);
after the strength of the raft plate concrete reaches 100%, a pressure gauge (9) and a first water stop valve (8-1) are respectively installed at a water inlet close to the side water pipe, a second water stop valve (11) is installed on the middle water pipe (12-1), and water outlets of the middle water pipe and the side water pipe are respectively communicated with a water discharge pipe (13);
step five, opening a second water stop valve (11), allowing groundwater to enter a steel sleeve from a dewatering well under the action of underground water pressure, discharging the discharged water to a field water collecting well through a water discharging pipe, filtering sand, stone and impurities in the water by using tree palm in a filter plate, and opening a first water stop valve (8) to release pressure when the numerical value of a pressure gauge (9) reaches a designed anti-floating pressure value;
sixthly, after the well sealing condition is achieved, cutting and removing the steel cover plate, the side water pipe and the filter plate, and sealing an opening on the side wall of the top of the steel sleeve;
pumping the water level to 500mm below the bottom surface of the bedding concrete by using a water pump, and filling a plugging material into the steel sleeve to 200mm below the bottom surface of the bedding concrete; then pouring micro-expansion waterproof concrete on the upper part of the plugging material to the position below the internal water stop ring (6), and welding the internal water stop ring with a steel plate;
and step eight, pouring concrete into the steel sleeve at the upper part of the steel plate, and completing well sealing.
2. The construction method of the anti-floating decompression system of the basement foundation raft of claim 1, wherein: the lower layer steel plate and the upper layer steel plate are both conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010255255.8A CN111593771B (en) | 2020-04-02 | 2020-04-02 | Construction method of anti-floating pressure-reducing system of basement bottom plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010255255.8A CN111593771B (en) | 2020-04-02 | 2020-04-02 | Construction method of anti-floating pressure-reducing system of basement bottom plate |
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| Publication Number | Publication Date |
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| CN111593771A true CN111593771A (en) | 2020-08-28 |
| CN111593771B CN111593771B (en) | 2024-04-23 |
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| CN202010255255.8A Active CN111593771B (en) | 2020-04-02 | 2020-04-02 | Construction method of anti-floating pressure-reducing system of basement bottom plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032936A (en) * | 2021-11-01 | 2022-02-11 | 中天建设集团有限公司 | Two-stage plugging construction method for large-water-yield dewatering well |
| CN115217163A (en) * | 2022-06-06 | 2022-10-21 | 上海建工七建集团有限公司 | Water drainage structure of basement bottom plate and construction method of basement bottom plate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04102633A (en) * | 1990-08-17 | 1992-04-03 | Takenaka Komuten Co Ltd | Floating preventive method and device of building |
| BE1011470A3 (en) * | 1997-09-23 | 1999-10-05 | Smet F & C | Method and apparatus for stabilizing a lock or comparable structure |
| CN205530386U (en) * | 2016-03-21 | 2016-08-31 | 上海长凯岩土工程有限公司 | Water pressure control system for underground works with outlet pipe |
| CN110258660A (en) * | 2019-06-18 | 2019-09-20 | 广东龙越建筑工程有限公司 | The manufacture craft and shut-in well technique of the decompression drainage sump of basement anti-floating |
| CN210002453U (en) * | 2019-04-16 | 2020-01-31 | 中国建筑第四工程局有限公司 | pressure relief device for basement in water-rich underground river area |
-
2020
- 2020-04-02 CN CN202010255255.8A patent/CN111593771B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04102633A (en) * | 1990-08-17 | 1992-04-03 | Takenaka Komuten Co Ltd | Floating preventive method and device of building |
| BE1011470A3 (en) * | 1997-09-23 | 1999-10-05 | Smet F & C | Method and apparatus for stabilizing a lock or comparable structure |
| CN205530386U (en) * | 2016-03-21 | 2016-08-31 | 上海长凯岩土工程有限公司 | Water pressure control system for underground works with outlet pipe |
| CN210002453U (en) * | 2019-04-16 | 2020-01-31 | 中国建筑第四工程局有限公司 | pressure relief device for basement in water-rich underground river area |
| CN110258660A (en) * | 2019-06-18 | 2019-09-20 | 广东龙越建筑工程有限公司 | The manufacture craft and shut-in well technique of the decompression drainage sump of basement anti-floating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032936A (en) * | 2021-11-01 | 2022-02-11 | 中天建设集团有限公司 | Two-stage plugging construction method for large-water-yield dewatering well |
| CN115217163A (en) * | 2022-06-06 | 2022-10-21 | 上海建工七建集团有限公司 | Water drainage structure of basement bottom plate and construction method of basement bottom plate |
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| CN111593771B (en) | 2024-04-23 |
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