CN116024998A - Construction method for water-sealing blocking of deep foundation pit dewatering well - Google Patents
Construction method for water-sealing blocking of deep foundation pit dewatering well Download PDFInfo
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- CN116024998A CN116024998A CN202310250522.6A CN202310250522A CN116024998A CN 116024998 A CN116024998 A CN 116024998A CN 202310250522 A CN202310250522 A CN 202310250522A CN 116024998 A CN116024998 A CN 116024998A
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- water
- dewatering well
- grouting
- foundation pit
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- 238000010276 construction Methods 0.000 title claims abstract description 21
- 230000000903 blocking effect Effects 0.000 title claims abstract description 12
- 238000007789 sealing Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000004568 cement Substances 0.000 claims abstract description 43
- 239000010865 sewage Substances 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000004575 stone Substances 0.000 claims description 10
- 239000004677 Nylon Substances 0.000 claims description 9
- 229920001778 nylon Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a construction method for a deep foundation pit dewatering well with water blocking, which comprises the following steps: a water collecting tank is built at the wellhead of the dewatering well, and two sewage pumps for draining mud outwards are arranged in the water collecting tank; two grouting pipes for injecting cement slurry under high pressure are arranged, 2 sewage pumps are started, the concrete is injected under water to the elevation of 2.5m at the bottom of the cushion layer, and the cement slurry is injected under high pressure; after the concrete is finally set, a second water suction pump for pumping water outwards, a drain pipe and a third grouting pipe for injecting cement paste at high pressure are put down, the second water suction pump is started, the gravels are backfilled under water to the elevation position of 0.3m at the bottom of the raft, then the concrete is poured to the elevation of the wellhead of the dewatering well, and cement paste is injected at high pressure; cutting off the third grouting pipe and the drain pipe, welding a flange to seal the wellhead of the dewatering well, and pouring concrete at the flange to seal the wellhead of the dewatering well until the top of the raft board is high, thereby completing the plugging of the dewatering well. The invention solves the problem of plugging the dewatering well in a state that the underground water level of the deep foundation pit is higher than the elevation of the foundation raft and the water collecting pit.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a water-sealing and blocking construction method for a deep foundation pit dewatering well.
Background
In project construction, the situation that the ground water level generally tends to rise is often encountered. The foundation pit engineering is used for constructing a dewatering well before earth excavation. Because the situation that the dewatering well outside the foundation pit cannot meet the construction requirement is encountered in the year of water enlargement and the condition that the dewatering well is arranged next to the river, the dewatering well is required to be arranged in the foundation pit. The foundation pit belongs to a deep foundation pit, excavation of the foundation pit is completed, and a large amount of water gushes during plugging of a dewatering well in the foundation pit, so that difficulty is increased for plugging of the dewatering well.
Disclosure of Invention
The invention provides a construction method for plugging a deep foundation pit dewatering well with water, which can solve the problem of plugging the dewatering well in a dewatering well water state.
A construction method for a deep foundation pit dewatering well with water blocking comprises the following steps:
building a water collecting tank around the wellhead of the dewatering well, and arranging two sewage pumps in the water collecting tank, wherein the sewage pumps are communicated with a drainage main pipe through nylon plastic pipes;
pumping out a first water suction pump in the dewatering well, setting two grouting pipes, starting two sewage pumps simultaneously, pouring concrete under water to the elevation of 2.5m of the bottom of the cushion layer, and injecting cement slurry under high pressure through the grouting pipes before the concrete is finally solidified;
cutting off two grouting pipes, lowering a second water suction pump, a drain pipe and a third grouting pipe, communicating the water suction pump with a drain main pipe through the drain pipe, starting the second water suction pump, backfilling gravels under water to the elevation of 0.3m of the raft bottom, then pouring concrete to the elevation of the wellhead of the dewatering well, and injecting cement slurry under high pressure through the third grouting pipe before the concrete is finally solidified;
cutting off the third grouting pipe and the drain pipe, welding a flange to seal the wellhead of the dewatering well, and pouring concrete at the flange to seal the wellhead of the dewatering well until the top of the raft board is high, thereby completing the plugging of the dewatering well.
Further, the cement paste is cement paste with a cement paste ratio of 1:0.5, and the cement paste injection amount of each grouting pipe is 2 tons.
Further, the grouting pipes are DN25 steel pipes, and grouting holes are arranged at intervals in the grouting pipes Guan Zhou.
Further, the crushed stone is crushed stone with the diameter of 5-10 mm.
Further, the flange thickness is 5mm.
Further, the sewage pump is a 100WQ80-45 type sewage pump.
Further, the nylon plastic tube is DN80 nylon plastic tube.
Further, the second water suction pump is a 200QJ63-60 type water suction pump.
The invention has the beneficial effects that: according to the invention, the drainage and the dewatering well sealing operation can be simultaneously carried out under the dewatering well water gushing state, so that the problem of the plugging of the dewatering well under the condition that the underground water level elevation of the deep foundation pit is higher than that of the foundation raft and the water collecting pit is solved.
Drawings
FIG. 1 is a sectional view of a plugging structure in a deep foundation pit dewatering well with water plugging construction method.
Symbol description in the drawings:
1. a first underwater concrete layer, a second gravel layer, a second water pump, a third concrete layer, a cushion layer, a flange, and 7, pouring a concrete layer for the fourth time, 8, a first grouting pipe, 9, a third grouting pipe, 10, a second grouting pipe, 11, a drain pipe 12 and a water collecting tank.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, rather than indicating or implying that the apparatus or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and should not be construed as limiting the present patent, and that the specific meaning of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances.
In the description of this patent, unless explicitly stated and limited otherwise, the term "coupled" or the like should be interpreted broadly, as referring to the connection between components, for example, either fixedly, detachably, or integrally; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two parts or interaction relationship between the two parts. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A construction method for a deep foundation pit dewatering well with water blocking comprises the following steps:
building a water collecting tank around the wellhead of the dewatering well, and installing two sewage pumps in the water collecting tank 12, wherein the sewage pumps are communicated with a drainage main pipe through nylon plastic pipes;
pumping out a first water suction pump in the dewatering well, setting two grouting pipes, starting two sewage pumps simultaneously, pouring concrete under water to the elevation of 2.5m of the bottom of the cushion layer, and injecting cement slurry under high pressure through the grouting pipes before the concrete is finally solidified;
cutting off two grouting pipes, lowering a second water suction pump, a drain pipe and a third grouting pipe, communicating the water suction pump with a drain main pipe through the drain pipe, starting the second water suction pump, backfilling gravels under water to the elevation of 0.3m of the raft bottom, then pouring concrete to the elevation of the wellhead of the dewatering well, and injecting cement slurry under high pressure through the third grouting pipe before the concrete is finally solidified;
cutting off the third grouting pipe and the drain pipe, welding a flange to seal the wellhead of the dewatering well, and pouring concrete at the flange to seal the wellhead of the dewatering well until the top of the raft board is high, thereby completing the plugging of the dewatering well.
As shown in figure 1, the underground water level elevation of the engineering is about-14 m and is higher than that of a foundation raft and a water collecting pit, so that the water pressure balance is kept as much as possible in the well sealing construction process, meanwhile, the water collecting tank 12 is built around the well mouth position for accumulating upward cement paste in the underwater pouring process, the net size of the water collecting tank 12 is 2m long by 2m wide by 1.5m high, standard brick building is adopted, waterproof mortar with the thickness of 20mm is smeared at the bottom and the periphery of the inner wall of the tank, and polypropylene fiber is pasted for waterproof. After the water collecting tank 12 is built, 2 100WQ80-45 sewage pumps are installed in the tank, and the sewage is discharged from the water collecting tank 12 into a main drainage pipe network outside the foundation pit through DN80 nylon plastic pipes.
As shown in fig. 1, a first water suction pump in the dewatering well is pulled out, 2 sewage pumps are started while two grouting pipes are started, the two grouting pipes are a first grouting pipe 8 and a second grouting pipe 10, and the first grouting pipe 8 and the first grouting pipe 10 are placed in symmetrical positions along the wall of the dewatering well. Then, pouring concrete into the water under the water in the pouring process, flushing the cement paste in the dewatering well to a water collecting pool along with the pouring, starting 2 sewage pumps to pump the flushed cement paste into a main drainage pipe through nylon plastic pipes, and continuously pouring until the elevation of the bottom 2.5m of the cushion layer, wherein the first pouring is completed. Curing for 3-7 days until the concrete is finally solidified to form the first underwater poured concrete layer 1. And (3) injecting cement slurry at high pressure through the grouting pipe before the concrete is finally set. Before the concrete is finally set, cement slurry is injected into the first grouting pipe 8 at high pressure, and the gap of the first underwater poured concrete layer 1 is sealed and plugged. Further, the cement paste is cement paste with a cement paste ratio of 1:0.5, and the cement paste injection amount of each grouting pipe is 2 tons. The net amount of cement injected into the first grouting pipe 8 at high pressure is 2 tons. The cement paste is cement paste with a water cement ratio of 1:0.5. The second grouting pipe 10 is a spare pipe for the first grouting pipe 8, and the second grouting pipe 10 is activated if the first grouting pipe 8 is blocked by sundries during construction.
As shown in fig. 1, after the first underwater concrete layer 1 is finally set, two grouting pipes are cut off, and a second suction pump, a drain pipe 11 and a third grouting pipe are lowered. And backfilling the crushed stone underwater, and continuously backfilling the crushed stone until the elevation of the raft bottom is 0.3m, so that a second crushed stone layer 2 is formed. After backfilling is completed, the water in the dewatering well is pumped out along with the start of the second water pump, and is pumped to a main drainage pipe through a drainage pipe 11 for drainage. And then concrete is poured for the second time. In the second concrete pouring process, the water in the dewatering well is pumped by a second water pump and is discharged from the water pump to the main water drainage pipe through the water drainage pipe, the second concrete pouring is continued until the elevation of the wellhead of the dewatering well, and the third concrete pouring layer 4 is formed after the concrete is finally solidified. And (3) injecting cement slurry at high pressure through a third grouting pipe before the concrete is finally set. The third grouting pipe 9 is used for injecting cement slurry under high pressure to seal and block the gap between the third grouting concrete layer 4 and the second crushed stone layer 2. Further, the cement paste is cement paste with a cement paste ratio of 1:0.5, and the amount of cement paste injected into each grouting pipe ranges from 2 tons to 2.5 tons. The amount of cement slurry injected into each grouting pipe is different according to the compactness of concrete pouring. In this embodiment, the amount of cement slurry injected at high pressure in the first grouting pipe 8 is 2 tons, and the amount of cement slurry injected at high pressure in the third grouting pipe 9 is 2 tons. The cement paste is cement paste with a water cement ratio of 1:0.5.
As shown in fig. 1, after the third poured concrete layer 4 and the second crushed stone layer 2 are finally solidified, the third grouting pipe and the drain pipe are cut off, the second water suction pump is abandoned and sealed into the well, and the welding flange seals the wellhead of the dewatering well. Further, the thickness of the flange is 5mm. The flange of this thickness is chosen through years of practical experience. The flange with the thickness can effectively stop water and has a sealing effect. And after the wellhead of the dewatering well is welded with the flange closed wellhead, casting concrete to the top of the raft plate for the third time at the wellhead of the flange closed dewatering well, and completing the plugging of the dewatering well.
The construction method of the dewatering well with the water seal well is completed by the first pouring concrete, the second pouring concrete, the third pouring concrete, the second backfilling broken stone and the total four pouring, backfilling and pouring.
Further, the grouting pipes are DN25 steel pipes, and grouting holes are arranged at intervals in the grouting pipes Guan Zhou. The grouting pipes comprise a first grouting pipe 8, a second grouting pipe 10 and a third grouting pipe 9 are all DN25 steel pipes. Grouting holes are arranged at intervals around the DN25 steel pipe. The grouting holes are uniformly distributed at intervals from the bottom end to the position 13400mm on the first grouting pipe 8 and the second grouting pipe 10, and the third grouting pipe 9 is used for sealing the gaps between the first concrete layer 1, the second gravel layer and the third concrete layer by the grouting holes.
Further, the sewage pump is a 100WQ80-45 type sewage pump, and the second water suction pump is a 200QJ63-60 type water suction pump. In the above embodiment, the sewage pump and the second water pump are selected from the types, and through engineering practice, the sewage pump is most preferably a 100WQ80-45 type sewage pump, and the second water pump is most preferably a 200QJ63-60 type water pump.
It should be understood that the above description is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be apparent to those skilled in the art that various modifications, equivalents, variations, and the like can be made to the present invention. However, such modifications are intended to fall within the scope of the present invention without departing from the spirit of the present invention. In addition, some terms used in the specification and claims of the present application are not limiting, but are merely for convenience of description.
Claims (8)
1. The construction method for the water-sealing blocking of the deep foundation pit dewatering well belt is characterized by comprising the following steps of:
building a water collecting tank around the wellhead of the dewatering well, and arranging two sewage pumps in the water collecting tank, wherein the sewage pumps are communicated with a drainage main pipe through nylon plastic pipes;
pumping out a first water suction pump in the dewatering well, setting two grouting pipes, starting two sewage pumps simultaneously, pouring concrete under water to the elevation of 2.5m of the bottom of the cushion layer, and injecting cement slurry under high pressure through the grouting pipes before the concrete is finally solidified;
cutting off two grouting pipes after the concrete is finally set, lowering a second water suction pump, a drain pipe and a third grouting pipe, communicating the water suction pump with a drain main pipe through the drain pipe, starting the second water suction pump, backfilling gravels under water to the elevation of 0.3m of the raft bottom, then pouring concrete to the elevation of the wellhead of the dewatering well, and injecting cement slurry under high pressure through the third grouting pipe before the concrete is finally set;
cutting off the third grouting pipe and the drain pipe, welding a flange to seal the wellhead of the dewatering well, and pouring concrete at the flange to seal the wellhead of the dewatering well until the top of the raft board is high, thereby completing the plugging of the dewatering well.
2. The construction method for the water-sealing of the deep foundation pit dewatering well belt according to claim 1, wherein the cement slurry is cement slurry with a water cement ratio of 1:0.5, and the amount of cement slurry injected into each grouting pipe is 2-2.5 tons.
3. The construction method for the dewatering well with water blocking of the deep foundation pit according to claim 2, wherein the grouting pipes are DN25 steel pipes, and grouting holes are arranged at intervals on the grouting pipes Guan Zhou.
4. The construction method for the water-sealing blockage of the dewatering well of the deep foundation pit according to claim 3, wherein the broken stone is broken stone with the diameter of 5-10 mm.
5. The construction method for the water blocking of the deep foundation pit dewatering well belt according to claim 4, wherein the thickness of the flange is 5mm.
6. The construction method for the dewatering well with water blocking of the deep foundation pit according to claim 6, wherein the sewage pump is a 100WQ80-45 sewage pump.
7. The construction method for the dewatering well with water blocking of the deep foundation pit according to claim 7, wherein the nylon plastic pipe is DN80 nylon plastic pipe.
8. The construction method for the deep foundation pit dewatering well with water blocking according to claim 8, wherein the second water suction pump is a 200QJ63-60 type water suction pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310250522.6A CN116024998A (en) | 2023-03-16 | 2023-03-16 | Construction method for water-sealing blocking of deep foundation pit dewatering well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310250522.6A CN116024998A (en) | 2023-03-16 | 2023-03-16 | Construction method for water-sealing blocking of deep foundation pit dewatering well |
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| CN116024998A true CN116024998A (en) | 2023-04-28 |
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| CN202310250522.6A Pending CN116024998A (en) | 2023-03-16 | 2023-03-16 | Construction method for water-sealing blocking of deep foundation pit dewatering well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117684592A (en) * | 2024-02-02 | 2024-03-12 | 中国冶金地质总局第三地质勘查院 | Method for treating serial layer polluted water well |
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| CN103334444A (en) * | 2013-07-09 | 2013-10-02 | 中国一冶集团有限公司 | Decompression type blocking method for foundation pit dewatering well |
| CN104929143A (en) * | 2015-04-27 | 2015-09-23 | 华东交通大学 | Well sealing method of dewatering well at bottom of foundation pit |
| CN106351240A (en) * | 2015-07-16 | 2017-01-25 | 中勘冶金勘察设计研究院有限责任公司 | Shut-in method for dewatering well arranged below building or structure foundation |
| CN106894428A (en) * | 2015-12-21 | 2017-06-27 | 中冶天工集团有限公司 | Multi-channel waterproof plugging method for dewatering well of thick and large raft foundation |
| CN108166517A (en) * | 2018-02-10 | 2018-06-15 | 中国建筑第五工程局有限公司 | For the shut-in well method and well-sealing device of superelevation floor height hydraulic pressure dewatering well of deep well |
| CN109881694A (en) * | 2019-04-04 | 2019-06-14 | 中铁十一局集团城市轨道工程有限公司 | A kind of constructing structure blocked for foundation pit substrate Sand and method |
| CN217998129U (en) * | 2022-06-21 | 2022-12-09 | 中国建筑第七工程局有限公司 | Precipitation well block structure |
| CN115787691A (en) * | 2022-12-01 | 2023-03-14 | 中建八局第二建设有限公司 | Construction method of well plugging device for dewatering well in underground water rich area |
-
2023
- 2023-03-16 CN CN202310250522.6A patent/CN116024998A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334444A (en) * | 2013-07-09 | 2013-10-02 | 中国一冶集团有限公司 | Decompression type blocking method for foundation pit dewatering well |
| CN104929143A (en) * | 2015-04-27 | 2015-09-23 | 华东交通大学 | Well sealing method of dewatering well at bottom of foundation pit |
| CN106351240A (en) * | 2015-07-16 | 2017-01-25 | 中勘冶金勘察设计研究院有限责任公司 | Shut-in method for dewatering well arranged below building or structure foundation |
| CN106894428A (en) * | 2015-12-21 | 2017-06-27 | 中冶天工集团有限公司 | Multi-channel waterproof plugging method for dewatering well of thick and large raft foundation |
| CN108166517A (en) * | 2018-02-10 | 2018-06-15 | 中国建筑第五工程局有限公司 | For the shut-in well method and well-sealing device of superelevation floor height hydraulic pressure dewatering well of deep well |
| CN109881694A (en) * | 2019-04-04 | 2019-06-14 | 中铁十一局集团城市轨道工程有限公司 | A kind of constructing structure blocked for foundation pit substrate Sand and method |
| CN217998129U (en) * | 2022-06-21 | 2022-12-09 | 中国建筑第七工程局有限公司 | Precipitation well block structure |
| CN115787691A (en) * | 2022-12-01 | 2023-03-14 | 中建八局第二建设有限公司 | Construction method of well plugging device for dewatering well in underground water rich area |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117684592A (en) * | 2024-02-02 | 2024-03-12 | 中国冶金地质总局第三地质勘查院 | Method for treating serial layer polluted water well |
| CN117684592B (en) * | 2024-02-02 | 2024-04-19 | 中国冶金地质总局第三地质勘查院 | Method for treating serial layer polluted water well |
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Application publication date: 20230428 |