CN114457828A - Construction method of open cut fabricated underground structure foundation pit dewatering well - Google Patents
Construction method of open cut fabricated underground structure foundation pit dewatering well Download PDFInfo
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- CN114457828A CN114457828A CN202210082268.9A CN202210082268A CN114457828A CN 114457828 A CN114457828 A CN 114457828A CN 202210082268 A CN202210082268 A CN 202210082268A CN 114457828 A CN114457828 A CN 114457828A
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- foundation pit
- dewatering well
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- plugging
- construction
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- 238000010276 construction Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000001556 precipitation Methods 0.000 claims description 31
- 238000005086 pumping Methods 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 8
- 238000007781 pre-processing Methods 0.000 claims description 6
- 239000003337 fertilizer Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
-
- 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)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a construction method of an open cut assembly type underground structure foundation pit dewatering well, which comprises the steps of completing the first plugging of the dewatering well after a base cushion layer and a leveling strip are constructed and before a station prefabricated bottom plate is assembled, and performing the second permanent plugging of the dewatering well after the prefabricated structure is assembled by arranging a dewatering well lateral water outlet device and a pre-arranged grouting secondary plugging device in the well. The assembly method has the advantages that conditions are provided for assembly of an assembly type underground structure, particularly an assembly type station structure, the dewatering well can normally drain the bottom of the foundation pit after first plugging, the anhydrous environment required by assembly construction in the assembly type structure foundation pit and the safety requirement of station anti-floating during construction can be met, the leakage risk caused by bottom plate hole reserving post-pouring is avoided, meanwhile, the construction efficiency is increased, the cost is saved, and the construction quality is reliable.
Description
Technical Field
The invention relates to construction of a subway station foundation pit dewatering well, in particular to a construction method of an open cut fabricated underground structure foundation pit dewatering well.
Background
In the construction of the open-cut underground deep foundation pit, in order to meet the requirements of the waterless construction environment in the foundation pit and the anti-floating safety during the construction of an underground station, particularly the construction of the underground foundation pit, a dewatering well is arranged in the foundation pit in the construction process to dry the soil in the foundation pit. When a base plate of a station is poured and constructed in the existing foundation pit dewatering well, a bottom plate dewatering well drainage hole needs to be reserved in a dewatering well position bottom plate, and dewatering is carried out through the drainage hole so as to meet the anti-floating safety requirement of the station during construction.
In the prior art, the main structure of a station is generally poured and constructed, and after earth covering above a top plate of the station is backfilled, a drain hole reserved in a dewatering well of a bottom plate of the station is plugged. The dewatering well at the position of the station bottom plate is plugged once, and is mainly plugged by directly pouring concrete into a preformed hole of the cast-in-place station bottom plate. However, the plugging of the station bottom plate dewatering well is often carried out in the water environment, the construction quality of the plugging structure is difficult to control, the outer package of the station bottom plate is waterproof and cannot be sealed, and the position of the station bottom plate dewatering well is easy to leak.
And the existing method for the open-cut cast-in-place subway station foundation pit dewatering well has the problem that the dewatering well conflicts with a prefabricated base plate of the station when the open-cut assembled subway station is assembled, and the requirement for dewatering and dewatering in the foundation pit in the assembling construction process of the assembled station cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the construction method of the open-cut fabricated underground structure foundation pit dewatering well, which is used for plugging twice at different construction periods to meet the requirements of fabricated processes and dewatering in the pit.
The technical scheme adopted by the invention for solving the technical problems is as follows: a construction method of open cut assembly type underground structure foundation pit dewatering well comprises the following steps:
the method comprises the following steps: constructing foundation pit enclosure;
step two: constructing a dewatering well, and excavating foundation pits in layers;
step three: performing first grouting plugging on a precipitation wellhead;
step four: arranging a lateral precipitation blocking structure for secondary precipitation;
step five: assembling an assembled underground structure;
step six: and performing secondary grouting plugging on the dewatering well by utilizing the lateral plugging structure.
And as an improvement of the technical scheme, in the second step, the dewatering well is positioned at the position, close to the side wall, of the bottom of the foundation pit during the layered excavation.
And as a further improvement of the technical scheme, in the second step, when the foundation pit is excavated in layers, the upper part of each layer of dewatering well casing is cut section by section and recovered, and the foundation pit is constructed after the foundation pit is excavated to the designed elevation of the pit bottom of the foundation pit.
As a further improvement of the above technical scheme, in the third step, the first plugging position of the precipitation port is located at the upper part of the precipitation well, and the lateral water outlet device and the second plugging structure are preset in the precipitation well.
As a further improvement of the technical scheme, the secondary plugging structure and the lateral water outlet device are respectively a grouting embedded pipe and a water pumping embedded pipe which extend out of the precipitation well, and the grouting embedded pipe and the water pumping embedded pipe extend to the ground through a fertilizer tank at the side edge of the foundation pit.
As a further improvement of the technical scheme, the foundation pit enclosure in the first step adopts a supporting mode of arranging an underground continuous wall and an inner support, and soil in the foundation pit is drained by adopting a dewatering well in the pit.
As a further improvement of the technical scheme, in the first step, the pre-processing of the grouting dewatering well structure and the pre-processing of the assembled underground structure are performed twice before the construction of the foundation pit enclosure.
As a further improvement of the above technical scheme, in the fifth step, the underground assembly structure is assembled after the foundation bed course construction, and is assembled under the first support, and the assembling process is as follows: the method comprises the steps of constructing a fine leveling strip of the assembled underground structure, assembling prefabricated bottom plates of the assembled underground structure, assembling prefabricated side walls and prefabricated top plates, and covering soil on the top plates after assembling.
The beneficial effects are that: according to the foundation pit dewatering well construction method, after the construction of the base cushion layer and the fine flat strip is completed, the first plugging of the dewatering well is completed before the assembly of the station prefabricated bottom plate, and the secondary permanent plugging of the dewatering well is performed after the assembly of the prefabricated structure is completed by arranging the dewatering well lateral water outlet device and the secondary grouting plugging device preset in the well. The assembly method has the advantages that conditions are provided for assembly of an assembly type underground structure, particularly an assembly type station structure, the dewatering well can normally drain the bottom of the foundation pit after first plugging, the anhydrous environment required by assembly construction in the assembly type structure foundation pit and the safety requirement of station anti-floating during construction can be met, the leakage risk caused by bottom plate hole reserving post-pouring is avoided, meanwhile, the construction efficiency is increased, the cost is saved, and the construction quality is reliable.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of the construction process of the present invention;
FIG. 2 is a schematic view of the construction dewatering well structure of the present invention;
FIG. 3 is a schematic view of a first occlusion configuration of the present invention;
FIG. 4 is a schematic bottom view of a construction assembly underground structure according to the present invention;
FIG. 5 is a schematic view of a construction assembly underground structure of the present invention;
fig. 6 is a schematic view of the second plugging completion structure of the present invention.
1. Plugging for the first time; 2. plugging for the second time; 3. grouting a pre-buried pipe; 4. pumping water to form a pre-buried pipe; 5. a base pad layer; 6. dewatering wells; 7. an assembled underground structure.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
When carrying out the foundation pit construction of assembled structure, especially when the foundation pit construction of underground station, the foundation pit is strutted and is adopted the support form that sets up underground continuous wall and strut and support in the three tracks, and the foundation ditch inner soil body adopts precipitation well 6 in the hole to dredge, assembles for the excavation of foundation ditch and assembled subway station and provides anhydrous operation environment, can satisfy the anti safe demand that floats of subway station structure simultaneously, and this precipitation well 6 specific way is as follows: referring to fig. 1, the construction method of the open cut assembly type underground structure 7 foundation pit dewatering well 6 comprises the following steps:
the method comprises the following steps: constructing foundation pit enclosure;
specifically, referring to fig. 2, before the construction of the foundation pit enclosure, the pre-processing of the structure of the grouting precipitation well 6 and the pre-processing of the assembled underground structure 7 are performed twice, and the construction materials and the sizes are measured and selected, for example, when the well pipe of the precipitation well 6 with the wellhead diameter of 1.0m and the well pipe diameter of 0.6m is constructed, the thickness of the drainage layer is selected to be 0.2m so as to prevent mud and sand from being taken away, and meanwhile, the material of the drainage layer is selected according to the construction regulations.
When the foundation pit enclosure is constructed, the pit enclosure adopts a supporting mode of arranging the underground continuous wall and the inner support, and the soil body in the foundation pit is drained by adopting the dewatering well 6 in the pit, so that the waterless environment required by assembly construction in the foundation pit of the fabricated structure and the safety requirement of station anti-floating during construction can be met, and the leakage risk caused by the fact that the bottom plate is subjected to hole reserving and post-pouring is avoided.
In addition, when the dewatering well 6 is constructed, the construction process is as follows: preparing → drilling machine entering → positioning and installing → opening hole → lower well pipe → filling material → well washing → lower pump trying to pump out, and constructing according to the requirement of hole forming of the rotary digging cast-in-place pile.
Step two: constructing a dewatering well 6, and excavating foundation pits in layers;
referring to fig. 3, the dewatering well 6 is located at the bottom of the foundation pit near the side wall during layered excavation, so that the grouting embedded pipe 3 and the water pumping embedded pipe 4 which extend to the ground along the side wall of the foundation pit are conveniently arranged after the first plugging 1 is carried out, and later construction is facilitated.
And for the construction of the foundation pit similar to the fabricated station, the foundation pit is excavated in layers, the underground water in the foundation pit is lowered to 0.5-1 m below the excavation surface every time, the excavation of the next layer is facilitated, and the foundation bed course 5 is constructed after the designed elevation of the bottom of the foundation pit is excavated along with the layered excavation of the soil body in the foundation pit. And (3) cutting off the upper parts of well pipes of 6 dewatering wells one by one every time one layer is excavated, dividing and recovering exposed parts of the well pipes layer by layer along with the excavation progress, and constructing a base cushion layer 5 and an assembled station structure fine leveling strip after the foundation pit is excavated to the designed elevation of the bottom of the foundation pit.
Step three: performing first grouting plugging on the 6 th port of the dewatering well;
referring to fig. 4, after the foundation pit foundation bed course 5 is constructed, the assembly type underground structure 7 needs to be installed, and as the assembly type underground structure 7 is prefabricated in a factory, the wellhead of the precipitation well 6 is covered when the assembly type underground structure is installed, and the wellhead is interfered with each other, so that the assembly type structure cannot be installed on the precipitation well which is not plugged. Therefore, the first grouting plugging of the mouth of the dewatering well 6 is carried out before the assembly type underground structure 7 is installed, the first plugging 1 position of the dewatering well is positioned at the upper part of the dewatering well 6, and a lateral water outlet device and a second plugging 2 structure are preset in the dewatering well 6. After the foundation pit is excavated to the designed elevation of the pit bottom, a foundation bed 5 and an assembled station structure fine leveling strip are constructed, and the dewatering well 6 is plugged 1 for the first time before the prefabricated base plate of the station is assembled. For the first plugging 1 section of the assembly type station well pipe, the section of the dewatering well 6 with the length of 2m below the bottom of the foundation pit can be arranged, so that the stability of plugging can be ensured, a proper reserved space is reserved for the second plugging 2, and the second plugging 2 is facilitated. And the first section of plugging 1 is formed by capping reinforced concrete at a wellhead and pouring a first section of plugging section in a well in sequence from the base.
Step four: arranging a lateral precipitation blocking structure for secondary precipitation;
referring to fig. 5, the concrete structure of the second precipitation blocking may be determined according to the precipitation requirement and other construction conditions in the construction process, for example, the basic precipitation blocking structure, the structure of the second precipitation blocking 2 and the lateral water outlet device are a grouting embedded pipe 3 and a pumping embedded pipe 4 respectively extending from the precipitation well 6, and the grouting embedded pipe 3 and the pumping embedded pipe 4 extend to the ground through a fertilizer tank at the side of the foundation pit, the pumping embedded pipe 4 may pump water in the following construction process, so as to dry the precipitation well 6 in the station, and the grouting embedded pipe 3 may perform grouting during the second blocking, thereby ensuring smooth performance of the second blocking.
Step five: assembling an assembled underground structure 7;
and in the fifth step, the underground assembly type structure is assembled after the base cushion layer construction, and is assembled under the first support, and the assembling process is as follows: the method comprises the steps of constructing a fine leveling strip of the assembled underground structure 7, assembling a prefabricated bottom plate of the assembled underground structure 7, and assembling prefabricated side walls and a prefabricated top plate.
Precipitation well 6 sets up side direction water outlet device and predetermines slip casting secondary plugging device in the well, can normally carry out precipitation in the foundation ditch after 1 shutoff for the first time, can accomplish the bed course and the construction of level strip of 6 positions in the precipitation well after the shutoff for one time, provide the condition of assembling for assembly station structure bottom plate, avoided reserving the outlet on station bottom plate prefabricated component and watering the shutoff after simultaneously, can normally drench precipitation to the foundation ditch bottom behind 6 shutoff for the first time of precipitation well 1, it resists superficial safety requirement to assemble the required anhydrous environment of construction and station during the construction in the assembled subway station foundation ditch.
Step six: and performing secondary grouting plugging on the dewatering well 6 by utilizing the lateral plugging structure.
Referring to fig. 6, after the construction of the assembly type underground structure 7 is completed, the pre-buried grouting pipes extend to the ground from the side edges of the foundation pit, the pre-buried grouting pipes are reserved outside, grouting can be directly performed through the extended grouting pipes, secondary thorough plugging of the dewatering well 6 is not performed under the condition that the dewatering well 6 is needed after the construction is completed, top plate earthing is performed after the plugging is completed, a grouting opening and the assembly type underground structure 7 are covered, and the whole ground is paved.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A construction method of open cut assembly type underground structure foundation pit dewatering well is characterized in that: the method comprises the following steps:
the method comprises the following steps: constructing foundation pit enclosure;
step two: constructing a dewatering well, and excavating foundation pits in layers;
step three: performing first grouting plugging on a precipitation wellhead;
step four: arranging a lateral precipitation blocking structure for secondary precipitation;
step five: assembling an assembled underground structure;
step six: and performing secondary grouting plugging on the dewatering well by utilizing the lateral plugging structure.
2. The open cut fabricated underground structure foundation pit dewatering well construction method according to claim 1, characterized in that: and in the second step, the dewatering well is positioned at the position, close to the side wall, of the bottom of the foundation pit during the layered excavation.
3. The open cut fabricated underground structure foundation pit dewatering well construction method according to claim 2, characterized in that: and step two, when the foundation pit is excavated in layers, the upper part of the dewatering well casing of each layer is cut section by section and recovered, and the foundation pit is constructed after the foundation pit is excavated to the designed elevation of the pit bottom of the foundation pit.
4. The open cut fabricated underground structure foundation pit dewatering well construction method according to claim 1, characterized in that: and in the third step, the first plugging position of the water reducing port is positioned at the upper part of the precipitation well, and a lateral water outlet device and a second plugging structure are preset in the precipitation well.
5. The open cut fabricated underground structure foundation pit dewatering well construction method according to claim 4, characterized in that: the secondary plugging structure and the lateral water outlet device are respectively a grouting embedded pipe and a water pumping embedded pipe which extend out of the dewatering well, and the grouting embedded pipe and the water pumping embedded pipe extend to the ground through a fertilizer tank at the side edge of the foundation pit.
6. The open cut fabricated underground structure foundation pit dewatering well construction method according to claim 1, characterized in that: the foundation pit enclosure in the first step adopts a supporting mode of arranging an underground continuous wall and an inner support, and soil in the foundation pit is drained by adopting a dewatering well in the pit.
7. The open cut fabricated underground structure foundation pit dewatering well construction method according to claim 1, characterized in that: and in the first step, the pre-processing of the grouting dewatering well structure and the pre-processing of the assembled underground structure are carried out twice before the foundation pit enclosure is constructed.
8. The open cut fabricated underground structure foundation pit dewatering well construction method according to claim 1, characterized in that: and in the fifth step, the underground assembly type structure is assembled after the base cushion layer construction, and is assembled under the first support, and the assembling process is as follows: the method comprises the steps of constructing a fine leveling strip of the assembled underground structure, assembling prefabricated bottom plates of the assembled underground structure, assembling prefabricated side walls and prefabricated top plates, and covering soil on the top plates after assembling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210082268.9A CN114457828B (en) | 2022-01-24 | 2022-01-24 | Construction method for open cut assembled underground structure foundation pit dewatering well |
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| CN202210082268.9A CN114457828B (en) | 2022-01-24 | 2022-01-24 | Construction method for open cut assembled underground structure foundation pit dewatering well |
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| CN114457828B CN114457828B (en) | 2024-02-23 |
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| CN110144918A (en) * | 2019-05-22 | 2019-08-20 | 四川童燊防水工程有限公司 | Hypogee dewatering well antiseepage plugging construction method |
| CN110468862A (en) * | 2019-09-06 | 2019-11-19 | 广州地铁设计研究院股份有限公司 | A kind of plugging structure for subway station precipitation well head |
| CN110761291A (en) * | 2019-11-15 | 2020-02-07 | 中铁一局集团第二工程有限公司 | Anti-floating waterproof system and method applied to deep foundation pit in karst water-rich area |
| CN210104771U (en) * | 2019-03-29 | 2020-02-21 | 中国水利水电第十四工程局有限公司 | Be arranged in rich water stratum precipitation well plugging device |
| CN211849526U (en) * | 2019-11-12 | 2020-11-03 | 中国二十冶集团有限公司 | Deep basal pit secretly buries drainage well slip casting block structure |
| CN214574063U (en) * | 2020-11-24 | 2021-11-02 | 山西三建集团有限公司 | Closed structure of high water level large area foundation pit dewatering well |
-
2022
- 2022-01-24 CN CN202210082268.9A patent/CN114457828B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008223434A (en) * | 2007-03-15 | 2008-09-25 | Ohbayashi Corp | Construction method for underground structure and underground structure constructed by the construction method |
| CN107386307A (en) * | 2017-07-24 | 2017-11-24 | 中国建筑第八工程局有限公司 | Foundation ditch inner structure anti-floating system and its construction method |
| CN210104771U (en) * | 2019-03-29 | 2020-02-21 | 中国水利水电第十四工程局有限公司 | Be arranged in rich water stratum precipitation well plugging device |
| CN110144918A (en) * | 2019-05-22 | 2019-08-20 | 四川童燊防水工程有限公司 | Hypogee dewatering well antiseepage plugging construction method |
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| CN211849526U (en) * | 2019-11-12 | 2020-11-03 | 中国二十冶集团有限公司 | Deep basal pit secretly buries drainage well slip casting block structure |
| CN110761291A (en) * | 2019-11-15 | 2020-02-07 | 中铁一局集团第二工程有限公司 | Anti-floating waterproof system and method applied to deep foundation pit in karst water-rich area |
| CN214574063U (en) * | 2020-11-24 | 2021-11-02 | 山西三建集团有限公司 | Closed structure of high water level large area foundation pit dewatering well |
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| CN114457828B (en) | 2024-02-23 |
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