CN111593771B - Construction method of anti-floating pressure-reducing system of basement bottom plate - Google Patents
Construction method of anti-floating pressure-reducing system of basement bottom plate Download PDFInfo
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- CN111593771B CN111593771B CN202010255255.8A CN202010255255A CN111593771B CN 111593771 B CN111593771 B CN 111593771B CN 202010255255 A CN202010255255 A CN 202010255255A CN 111593771 B CN111593771 B CN 111593771B
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- water
- steel sleeve
- steel
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- concrete
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- 238000007667 floating Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 92
- 239000010959 steel Substances 0.000 claims abstract description 92
- 230000006837 decompression Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000003673 groundwater Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 241001289721 Lethe Species 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 5
- 238000001556 precipitation Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 18
- 238000007599 discharging Methods 0.000 description 2
- 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
- 239000013049 sediment Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a construction method of a basement foundation raft anti-floating decompression system, which is characterized in that a steel sleeve (internally provided with a water stop ring and a double-layer perforated steel plate filled with tree palm water filtering system), a pressure gauge, a water stop valve, a drain pipe and the like are arranged at the position of a dewatering well, and underground water under the basement raft foundation is dredged and not blocked, so that the basement bottom plate anti-floating decompression drainage system with drainage function is formed. When the underground water pressure reaches a certain pressure, the system automatically drains water by starting the self-drainage system, so that the aim of reducing the water pressure born by the bottom plate of the ground reservoir is fulfilled. The water pressure is monitored through the water pressure gauge, and when the water pressure reaches the anti-floating design requirement, the lateral water stop valve is opened, so that the aim of pressure reduction and anti-floating is fulfilled. By utilizing the method, a precipitation pump is not required to be used for pumping water, and the engineering cost is reduced.
Description
Technical Field
The invention relates to a construction method of a raft foundation anti-floating and pressure-reducing system of a basement foundation, in particular to a construction method of a raft foundation anti-floating and pressure-reducing system in a region rich in underground water and with a small anti-floating design value.
Background
At present, in the field of on-site building construction, a structural building with a basement adopting a raft foundation can consider the anti-floating design of the basement in the design process. In the actual construction process, the retention and the blocking of the foundation pit dewatering well are weak links of the anti-floating design of the structure. When the conventional dewatering well is sealed, the underground water level should be reduced to 500mm below the elevation of the substrate generally in the foundation construction, and when the construction of the top of the first floor of the tower is finished and the earthing of the top and the bottom plate of the basement is finished, the dewatering can be stopped. For the group residence projects, the basement area is larger, the precipitation wells are more, particularly, the areas with abundant groundwater are more, so that the precipitation pumps in the precipitation wells continuously work, the precipitation time is longer, and the generated cost is more.
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 basement foundation raft is produced by sealing a well in advance and is influenced by buoyancy to produce potential quality safety hazards.
A construction method of a basement foundation raft anti-floating decompression system comprises the following steps:
Step one, processing a steel sleeve structure, which comprises the following specific steps:
The method comprises the steps of firstly, welding an outer water stop ring on a steel sleeve along the circumferential direction of the outer wall of the lower part of the steel sleeve, and welding an inner water stop ring on the inner wall of the steel sleeve above the outer water stop ring along the circumferential direction of the inner wall of the steel sleeve;
A second step, 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 layer steel plate provided with a water discharge hole and an upper layer steel plate arranged above the lower layer steel plate and provided with the water discharge hole, and tree palm is filled between the lower layer steel plate and the upper layer steel plate;
thirdly, fully welding and fixing the outer edges of an upper steel plate and a lower steel plate of the filter plate with the circumferential direction of the inner wall of the steel sleeve respectively;
welding a steel cover plate with a middle water pipe communicated with the top wall on the top wall of the steel sleeve in the horizontal direction, and welding a side water pipe to an opening of the side wall of the top of the steel sleeve so that a water inlet of the side water pipe is communicated with the opening of the top of the steel sleeve;
step two, hooping 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 the cushion layer concrete by adopting soil, and then pouring the cushion layer concrete at the lower part of the set basement raft plate position;
binding bottom plate steel bars on the cushion layer concrete and pouring raft concrete;
step four, after the raft concrete reaches 100% strength, 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 water outlets of the middle water pipe and the side water pipe with a drain pipe;
Step five, opening a second water stop valve, enabling underground water to enter the steel sleeve from the dewatering well under the action of underground water pressure, discharging discharged water to the on-site water collecting well through the water discharge pipe, filtering sand and impurities in the water by utilizing tree palm in the filter plate, and opening the first water stop valve to release pressure when the value of the pressure gauge reaches a designed anti-floating pressure value;
Cutting and removing the steel cover plate, the lateral water pipes and the filter plate after the well sealing condition is reached, and plugging the open holes on the side wall of the top of the steel sleeve;
Step seven, pumping the water level to 500mm below the bottom surface of the cushion concrete by using a water pump, and filling plugging materials into the steel sleeve to 200mm below the bottom surface of the cushion concrete; then pouring micro-expansion waterproof concrete on the upper part of the plugging material to the lower part of the inner water stop ring, and welding the micro-expansion waterproof concrete with the inner water stop ring by using a steel plate;
and step eight, pouring concrete into the steel sleeve at the upper part of the steel plate, and sealing the well.
Compared with the prior art, the invention has the advantages that: the construction method for draining the conventional dewatering well is canceled, the underground water is drained in a dredging and unblocking mode by utilizing the pressure of the underground water, and the risk of floating and even damaging the raft of the basement caused by overlarge underground water pressure is effectively avoided through the drainage outlet with the pressure gauge. The system has the functions of draining water, resisting floating and reducing pressure. When the underground water pressure reaches a certain pressure, the system automatically drains water by starting the drainage system, so that the aim of reducing the water pressure borne by the bottom plate of the ground reservoir and avoiding the floating of the basement and the bottom plate 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 will now be described in detail with reference to the drawings and to specific embodiments.
As shown in fig. 1-3, the invention discloses a construction method of a basement foundation raft anti-floating decompression system, which comprises the following steps:
Step one, processing a steel sleeve structure, which comprises the following specific steps:
The first step, an outer water stop ring 5 is welded on the steel sleeve 2 along the circumferential direction of the outer wall of the lower part of the steel sleeve 2, and an inner water stop ring 6 is welded on the inner wall of the steel sleeve 2 above the outer water stop ring 5 along the circumferential direction of the inner wall of the steel sleeve 2;
Secondly, arranging a filter plate 7 on the inner wall of the steel sleeve 2 above the inner water stop ring 6, wherein the filter plate comprises a lower layer steel plate 7-2 provided with a water discharge hole 7-1 and an upper layer steel plate 7-4 arranged above the lower layer steel plate 7-2 and provided with the water discharge hole, and a tree palm 7-3 is filled between the lower layer steel plate 7-2 and the upper layer steel plate 7-4; the lower layer steel plate 7-2 and the upper layer steel plate 7-4 are preferably conical, and the conical shapes can be utilized to enable sediment in water to move towards the pipe wall direction through water pressure, so that the filtering load of a filtering layer is reduced.
Thirdly, fully welding and fixing the outer edges of the upper layer steel plate 7-4 and the lower layer steel plate 7-2 of the filter plate 7 with the circumferential direction of the inner wall of the steel sleeve 2 respectively;
Fourth, the steel cover plate 10 with the middle water pipe 12-1 connected to the top wall is welded to the top wall of the steel sleeve 2 in the horizontal direction, and one side water pipe 12-2 is welded to the opening of the side wall of the top of the steel sleeve 2 so that the water inlet of the side water pipe 12-2 is connected to the opening of the top of the steel sleeve 2.
Step two, hooping the lower part of the steel sleeve 2 along the vertical direction (the lap joint length of the steel sleeve and the steel sleeve is 300mm in general) on the outer wall of the upper part of the basement dewatering well 1 which is already constructed, fixing the outer part of the steel sleeve at the position below the bottom surface of cushion concrete (the preset position according to the construction design) by adopting soil, and then pouring cushion concrete 3 at the lower part of the preset position of a raft plate of the basement;
Binding bottom plate steel bars on the cushion concrete 3 and pouring raft concrete 4.
Step four, after the raft concrete reaches 100% strength, respectively installing a pressure gauge 9 and a first water stop valve 8-1 at a position close to a water inlet of a side water pipe 12-2, installing a second water stop valve 11 on a middle water pipe 12-1, and respectively communicating water outlets of the middle water pipe 12-1 and the side water pipe 12-2 with a drain pipe 13;
step five, opening a second water stop valve 11, enabling groundwater to enter the steel sleeve 2 from the dewatering well under the action of groundwater pressure, discharging discharged water to a site water collecting well through a drain pipe 13, filtering sand and impurities in the water by utilizing a tree palm 7-3 in the filter plate 7, and opening a first water stop valve 8-1 to release 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 (the earth backfilling of the top plate of the basement is completed, the floor surface layer of the basement is completed, and the main structure is completed) is achieved, cutting and removing the steel cover plate 10, the side water pipe 12-2 and the filter plate 7, and plugging the opening of the side wall of the top of the steel sleeve 2;
And seventhly, pumping the water level to 500mm below the bottom surface of the cushion concrete by using a water pump, and filling plugging materials (clay balls) into the steel sleeve to 200mm below the bottom surface of the cushion concrete. Then, pouring micro-expansion waterproof concrete on the upper part of the plugging material to the lower part of 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 sealing the well.
Claims (1)
1. The construction method of the basement foundation raft anti-floating decompression system is characterized by comprising the following steps of:
Step one, processing a steel sleeve structure, which comprises the following specific steps:
The method comprises the steps that firstly, an outer water stop ring (5) is welded on a steel sleeve along the circumferential direction of the outer wall of the lower part of the steel sleeve (2), and an inner water stop ring is welded on the inner wall of the steel sleeve above the outer water stop ring along the circumferential direction of the inner wall of the steel sleeve;
secondly, arranging a filter plate (7) on the inner wall of the steel sleeve above the inner water stop ring (6), wherein the filter plate comprises a lower layer steel plate (7-2) provided with a water discharge hole (7-1) and an upper layer steel plate (7-4) arranged above the lower layer steel plate and provided with the water discharge hole, and a tree palm (7-3) is filled between the lower layer steel plate and the upper layer steel plate; the lower layer steel plate and the upper layer steel plate are conical;
thirdly, fully welding and fixing the outer edges of an upper steel plate and a lower steel plate of the filter plate with the circumferential direction of the inner wall of the steel sleeve respectively;
Welding a steel cover plate (10) with a middle water pipe (12-1) communicated with the top wall on the top wall of the steel sleeve in the horizontal direction, and welding a side water pipe (12-2) to an opening of the side wall of the top of the steel sleeve so that a water inlet of the side water pipe is communicated with the opening of the top of the steel sleeve;
Step two, hooping 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 the cushion layer concrete by adopting soil, and then pouring the cushion layer concrete (3) at the lower part of the set basement raft plate position;
binding bottom plate steel bars on the cushion layer concrete and pouring raft concrete (4);
Step four, after the raft concrete reaches 100% strength, respectively installing a pressure gauge (9) and a first water stop valve (8-1) at a water inlet close to the side water pipe, installing a second water stop valve (11) on the middle water pipe (12-1), and respectively communicating water outlets of the middle water pipe and the side water pipe with a water drain pipe (13);
Step five, a second water stop valve (11) is opened, groundwater enters a steel sleeve from a dewatering well under the action of groundwater pressure, discharged water is discharged to a field water collecting well through a water discharge pipe, sand and impurities in the water are filtered by tree brown in a filter plate, and when the numerical value of a pressure gauge (9) reaches a designed anti-floating pressure value, the first water stop valve (8-1) is opened for pressure relief;
Cutting and removing the steel cover plate, the lateral water pipes and the filter plate after the well sealing condition is reached, and plugging the open holes on the side wall of the top of the steel sleeve;
Step seven, pumping the water level to 500mm below the bottom surface of the cushion concrete by using a water pump, and filling plugging materials into the steel sleeve to 200mm below the bottom surface of the cushion concrete; then, pouring micro-expansion waterproof concrete on the upper part of the plugging material to the lower part of the inner water stop ring (6), and welding the micro-expansion waterproof concrete with the inner water stop ring by using a steel plate;
and step eight, pouring concrete into the steel sleeve at the upper part of the steel plate, and sealing the well.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111593771A CN111593771A (en) | 2020-08-28 |
| CN111593771B true CN111593771B (en) | 2024-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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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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| CN (1) | CN111593771B (en) |
Families Citing this family (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 |
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| CN111593771A (en) | 2020-08-28 |
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