CN105780792B - A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well - Google Patents
A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well Download PDFInfo
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- CN105780792B CN105780792B CN201610225014.2A CN201610225014A CN105780792B CN 105780792 B CN105780792 B CN 105780792B CN 201610225014 A CN201610225014 A CN 201610225014A CN 105780792 B CN105780792 B CN 105780792B
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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
- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The present invention relates to a kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structures, drainage tube and lower part water-stopping steel ring flat-plate are inserted into dewatering well well casing interior design elevation location simultaneously first, secondly clay ball and microdilatancy plain concrete are up backfilled successively in lower part water-stopping steel ring flat-plate, then top water-stopping steel ring flat-plate is put at microdilatancy plain concrete top surface, and connect with lower part drainage steel pipe, plug and dewatering well well casing full weld, finally backfilled with bottom plate concrete in the upper surface of top water-stopping steel ring flat-plate.The problem of present invention efficiently solves last several mouthfuls of dewatering wells can not be shunt in a well due to the effect of artesian water by normal construction technique in the case of foundation pit high water head artesian water.The present invention has many advantages, such as that simple to operation, shut-in well is efficient, water-stagnating effect is good, safe and reliable, applied widely, can be that the shut-in well construction of similar base pit engineering high water head Dewatering by pressure reduction well is offered reference.
Description
Technical field
The present invention relates to a kind of Dewatering by pressure reduction well shut-in well method and shut-in well structures, and being particularly suitable for foundation pit, there are high water heads to hold
Press the plugging dewatering well of water.
Background technology
Under normal circumstances, base pit engineering is involved in the problems, such as that three aspects, including intensity, deformation and stability, stability are asked
Topic is the very important importance of base pit engineering, when base pit engineering is there are high water head artesian water, is tested by theoretical calculation method
It calculates, the anti-artesian water of foundation pit is prominent when gushing stability and being unsatisfactory for requiring, at this time, it may be necessary to Dewatering by pressure reduction well be arranged in foundation pit range, in base
It cheats and carries out on-demand pumping relief in entire digging process, ensure that the anti-artesian water at Foundation Pit bottom is prominent and gush stability and meet the requirements.When
Excavation of foundation pit is the bottom of to, before pouring basement bottom board, need by dewatering well water pump and pump line above propose recycling, carry out dewatering well
Shut-in well construction.Since surrounding also has a certain number of dewatering wells in operating status, artesian water head can for the shut-in well construction of early period
Control backfills absolute altitude hereinafter, can shunt in a well by normal construction technique in dewatering well, and the construction of the shut-in well in later stage is dropped due to majority
Well has stopped depressurizing work of drawing water, and causes several mouthfuls of last dewatering wells in the effect of high water head artesian water, can not be by just
Normal construction technology is shunt in a well.It is therefore proposed that the shut-in well measure of reliable, efficient foundation pit high water head Dewatering by pressure reduction well be currently there is an urgent need for
The engineering roadblock of solution.
Invention content
Problem to be solved by this invention is to provide a kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well,
The shut-in well method and shut-in well it is simple in structure it is easy to operate, shut-in well is efficient, water-stagnating effect is good, safe and reliable, applied widely.
Technical solution of the invention is：A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method, including drainage tube（On
Portion drains steel pipe, lower part drains steel pipe）, water-stopping steel ring flat-plate（Lower part water-stopping steel ring flat-plate, top water-stopping steel ring flat-plate）, plug, clay
Ball, microdilatancy plain concrete, with bottom plate concrete；Lower part water-stopping steel ring flat-plate and lower part drainage steel pipe full weld are connected first
It connects, top drainage steel pipe and lower part drainage steel pipe is flexibly connected obtained drainage tube by screw thread, and then by drainage tube（Contain
The side of lower part water-stopping steel ring flat-plate）It is inserted into inside dewatering well well casing, is pressed into designed elevation position down；Secondly by dewatering well
To backfill clay ball inside well casing to designed elevation position at the top of well casing, continue to well casing followed by dewatering well well casing top
For inside backfill microdilatancy plain concrete to designed elevation position, entire backfilling process underground high water head artesian water continues through drainage
Pipe is discharged；Then it after waiting for microdilatancy plain concrete initial set, removes top and drains steel pipe, run through plug and seal lower part drainage
Steel pipe top prevents underground high water head artesian water from draining steel pipe by lower part and emerges, and then in top water-stopping steel ring flat-plate upper surface
It is laid with leak stopping king with lower surface, and is put it into inside dewatering well well casing, at the upper surface location of microdilatancy plain concrete, is passed through
Top water-stopping steel ring flat-plate is connect by electric welding with lower part drainage steel pipe top, plug and dewatering well well casing full weld；Finally with same bottom
Plate mark concrete shuts dewatering well well casing.
The lower part water-stopping steel ring flat-plate is connect with lower part drainage steel-pipe welding, and lower surface connects with underground high water head artesian water
It touches, upper surface is contacted with clay ball；Lower part water-stopping steel ring flat-plate outer diameter is equal with dewatering well well casing diameter, and internal diameter drains steel with lower part
Pipe outside diameter is equal.
The lower part drainage steel pipe is equal with top drainage pipe diameter, outer diameter and wall thickness, and the two is labored by screw thread
Dynamic connection, lower part drainage steel pipe is elongated, is located inside dewatering well well casing, and lower part drains steel duct and is full of underground high water head
Artesian water, top drainage steel pipe is L-shaped, is partly located inside dewatering well well casing.
The clay ball be located at lower part water-stopping steel ring flat-plate upper surface, microdilatancy plain concrete bottom surface, lower part drainage steel pipe outside
Surface and dewatering well well casing inner surface are formed by spatial dimension.
The microdilatancy plain concrete is located at clay ball upper surface, top water-stopping steel ring flat-plate lower surface, lower part drainage steel pipe
Outer surface and dewatering well well casing inner surface are formed by spatial dimension.
The top water-stopping steel ring flat-plate is connect with lower part drainage steel pipe top, plug and dewatering well well casing inner surface full weld,
Upper surface is contacted with same bottom plate concrete bottom, is contacted at the top of lower surface and microdilatancy plain concrete.
The top water-stopping steel ring flat-plate is equal with lower part water-stopping steel ring flat-plate outer diameter, internal diameter and plate thickness.
The plug is connect with lower part drainage steel pipe top by thread seal.
The same bottom plate concrete is located at top water-stopping steel ring flat-plate and plug upper surface, dewatering well well casing top surface and interior
Surface is formed by spatial dimension.
The present invention also provides a kind of foundation pit high water head Dewatering by pressure reduction well shut-in well structures, including stretch into dewatering well well casing
Drainage tube and the water-stopping steel ring flat-plate in dewatering well well casing；Drainage tube drains steel pipe by top and lower part drainage steel pipe forms,
Top drains steel pipe and lower part drainage steel pipe is flexibly connected by screw thread；Water-stopping steel ring flat-plate includes lower part water-stopping steel ring flat-plate and top
Water-stopping steel ring flat-plate, lower part water-stopping steel ring flat-plate drain steel pipe lower end with lower part by welding and connect, and top water-stopping steel ring flat-plate passes through weldering
It connects and is connect with lower part drainage steel pipe upper end；Lower part drains steel pipe top and is equipped with plug, and plug passes through with lower part drainage steel pipe top
Thread seal connects；It is equipped with clay layers of balls successively and mixes from the bottom up between lower part water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate
Solidifying soil layer one；Concrete layer two is equipped with above the seal ring steel plate of top.
Top drains steel pipe and lower part drainage pipe diameter, outer diameter and wall thickness is equal；Top drainage steel pipe is L-shaped, on
Portion stretches into inside dewatering well well casing drainage steel pipe one end.
Lower part water-stopping steel ring flat-plate and top water-stopping steel ring flat-plate internal diameter, outer diameter and plate thickness are equal；Top water-stopping steel ring flat-plate is also
It is connect with plug and dewatering well well casing inner wall full weld.
The concrete layer one is microdilatancy plain concrete layer；The concrete layer two is with bottom plate concrete layer.
Clay ball is located at lower part water-stopping steel ring flat-plate upper surface, one bottom surface of concrete layer, lower part drainage outer surface of steel tube and drop
Well well casing inner surface is formed by spatial dimension；Concrete layer one is located under clay ball upper surface, top water-stopping steel ring flat-plate
Surface, lower part drainage outer surface of steel tube and dewatering well well casing inner surface are formed by spatial dimension；Concrete layer two is located at upper
Portion water-stopping steel ring flat-plate upper surface, dewatering well well casing top surface and inner surface are formed by spatial dimension.
The beneficial effects of the invention are as follows：It is underground bearing water by the way that drainage steel pipe is arranged inside base pit dewatering well well casing
Discharge provide effective channel so that drainage steel pipe and water-stopping steel ring flat-plate can smoothly be pressed into designed elevation position, and
The water-stopping steel ring flat-plate with drainage steel-pipe welding creates condition for the backfill of clay ball and microdilatancy plain concrete in advance, and blocks up
Head is connected through a screw thread with lower part drainage steel pipe top, and compression strength is high, is effective against the effect of underground bearing water, second
Water-stopping steel ring flat-plate and first of water-stopping steel ring flat-plate are formed by dual sealing barrier, can effectively prevent groundwater seepage, finally use
Dewatering well well casing is shut with bottom plate concrete, further improves the shut-in well quality of dewatering well, it is ensured that partition ground completely
Lower artesian water.
The present invention has many advantages, such as that simple to operation, shut-in well is efficient, water-stagnating effect is good, safe and reliable, applied widely,
It can offer reference for the shut-in well construction of similar base pit engineering high water head Dewatering by pressure reduction well.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the A-A diagrammatic cross-sections of the present invention.
Fig. 3 is the B-B diagrammatic cross-sections of the present invention.
Fig. 4 is the C-C diagrammatic cross-sections of the present invention.
Fig. 5 is the D-D diagrammatic cross-sections of the present invention.
Fig. 6 is the E-E diagrammatic cross-sections of the present invention.
Fig. 7 is the F-F diagrammatic cross-sections of the present invention.
Fig. 8 is the G-G diagrammatic cross-sections of the present invention.
Specific implementation mode
Referring to Fig. 1-8, the present invention includes drainage tube 1.1,1.2（Top drains steel pipe 1.1, lower part drains steel pipe 1.2）, only
Water steel loop plate 2.1,2.2（Lower part water-stopping steel ring flat-plate 2.1, top water-stopping steel ring flat-plate 2.2）, plug 3, clay ball 4, microdilatancy element it is mixed
Solidifying native 5, with bottom plate concrete 6.
The present invention implementation steps be：It is that water pump and pump line are above proposed into recycling first；Secondly by lower part water-stopping steel ring flat-plate 2.1
It is connect with lower part drainage 1.2 full weld of steel pipe, top drainage steel pipe 1.1 is done into activity even with lower part drainage steel pipe 1.2 by screw thread
It connects, and then by drainage tube 1.1,1.2（Side containing lower part water-stopping steel ring flat-plate 2.1）It is inserted into inside dewatering well well casing 7, presses down
Enter to designed elevation position, at this point, due to underground water have pressure-bearing property, underground high water head artesian water 8 will by drainage tube 1.1,
1.2 discharges drain and create condition for the indentation of drainage tube 1.1,1.2 so that drainage tube 1.1,1.2 can smoothly reach design mark
High position needs to carry out at this time the work that intercepts water outside dewatering well well casing 7, prevents the underground water of discharge from pouring in down a chimney in dewatering well, hinders
The shut-in well construction of follow-up dewatering well；Then by the top of dewatering well well casing to backfill clay ball 4 inside well casing to designed elevation position
It sets, followed by continuing at the top of dewatering well well casing, the backfill microdilatancy plain concrete 5 to the inside of well casing is whole to designed elevation position
A backfilling process underground high water head artesian water 8 continues through the discharge of drainage tube 1.1,1.2, waits for microdilatancy plain concrete initial set
Afterwards, it removes top and drains steel pipe 1.1, run through plug 3 and seal 1.2 top of lower part drainage steel pipe, underground high water head is prevented to hold
Pressure water 8 drains steel pipe 1.2 by lower part and emerges, and then is laid with leak stopping king in 2.2 upper and lower surface of top water-stopping steel ring flat-plate,
It is put into inside dewatering well well casing, at the upper surface location of microdilatancy plain concrete 5, by being welded top water-stopping steel ring flat-plate 2.2
It is connect with 1.2 top of lower part drainage steel pipe, plug 3 and 7 full weld of dewatering well well casing；It finally will with same bottom plate concrete 6
Dewatering well well casing is shut, and so far, the shut-in well construction of dewatering well is fully completed.
The present invention has the following advantages：
（1）It is simple to operation：Dewatering by pressure reduction well shut-in well method and the used material of structure and component are simple, clay ball,
Microdilatancy plain concrete, water-stopping steel ring flat-plate and drainage steel pipe etc. are the common material of architectural engineering and component, while the shut-in well
Without complicated assembly and special construction machinery, construction is very easy for method and structure.
（2）It shunts in a well efficient：The Dewatering by pressure reduction well shunt in a well method and structure construction procedure connection it is reasonable, can be when shorter
Between in complete shut-in well construction, and not by adjacent Dewatering by pressure reduction well shut-in well construction influenced, shunt in a well ultrahigh in efficiency.
（3）Water-stagnating effect is good, safe and reliable：Dewatering by pressure reduction well shut-in well method and structure are equipped with the double-deck water-stopping steel ring flat-plate,
And have globality, safety can at one equipped with clay ball and microdilatancy plain concrete and with bottom plate with the coagulation local soil type of label
The water sealing structure leaned on forms multiple sealing barrier, it is ensured that separate underground bearing water completely.
（4）It is applied widely：Shut-in well construction for the Dewatering by pressure reduction well of foundation pit setting, no matter artesian water head height is equal
It is applicable, it is particularly suitable for the shut-in well construction of last several mouthfuls of high water head Dewatering by pressure reduction wells.
Claims (4)
- A kind of method 1. foundation pit high water head Dewatering by pressure reduction well is shunt in a well, drains steel pipe full weld by lower part water-stopping steel ring flat-plate and lower part first Top drainage steel pipe is drained steel pipe with lower part and is flexibly connected obtained drainage tube by screw thread, and then drainage tube is inserted by connection Enter inside dewatering well well casing, is pressed into designed elevation position down；Secondly by the top of dewatering well well casing to backfilling inside well casing Clay ball continues to backfill microdilatancy plain concrete to the inside of well casing to designed elevation position followed by dewatering well well casing top To designed elevation position, entire backfilling process underground high water head artesian water continues through drainage tube discharge；Then microdilatancy element is waited for It after concrete initial set, removes top and drains steel pipe, run through plug and seal lower part drainage steel pipe top, prevent underground Gao Shui Head artesian water drains steel pipe by lower part and emerges；Then it is laid with leak stopping king in top water-stopping steel ring flat-plate upper and lower surface, and The top water-stopping steel ring flat-plate for being laid with leak stopping king is put into the upper surface position inside dewatering well well casing and positioned at microdilatancy plain concrete Place is set, top water-stopping steel ring flat-plate is drained steel pipe top, plug and dewatering well well casing full weld with lower part by electric welding connect；Most Dewatering well well casing is shut with same bottom plate concrete afterwards.
- The method 2. foundation pit high water head Dewatering by pressure reduction well as described in claim 1 is shunt in a well, it is characterised in that：Top drain steel pipe and Lower part drainage pipe diameter, outer diameter and wall thickness are equal；Top drainage steel pipe is L-shaped, and partial-length range is located at dewatering well Inside well casing；Lower part drainage steel pipe is elongated, and length range is located inside dewatering well well casing.
- The method 3. foundation pit high water head Dewatering by pressure reduction well as described in claim 1 is shunt in a well, it is characterised in that：Lower part water-stopping steel ring flat-plate It is equal with top water-stopping steel ring flat-plate internal diameter, outer diameter and plate thickness.
- The method 4. foundation pit high water head Dewatering by pressure reduction well as described in claim 1 is shunt in a well, it is characterised in that：Clay ball is located at lower part Water-stopping steel ring flat-plate upper surface, microdilatancy plain concrete bottom surface, lower part drainage outer surface of steel tube and dewatering well well casing inner surface institute shape At spatial dimension in；Microdilatancy plain concrete is located at clay ball upper surface, top water-stopping steel ring flat-plate lower surface, lower part drainage steel Tube outer surface and dewatering well well casing inner surface are formed by spatial dimension；It is located at top sealing steel loop with bottom plate concrete Plate and plug upper surface, dewatering well well casing top surface and inner surface are formed by spatial dimension.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610225014.2A CN105780792B (en) | 2016-04-12 | 2016-04-12 | A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well |
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| CN201610225014.2A CN105780792B (en) | 2016-04-12 | 2016-04-12 | A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well |
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| CN105780792A CN105780792A (en) | 2016-07-20 |
| CN105780792B true CN105780792B (en) | 2018-11-02 |
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| CN108930279B (en) * | 2017-05-27 | 2021-01-15 | 中国二十冶集团有限公司 | Method for sealing deep foundation pit downcast pipe well after excavation |
| CN110359472A (en) * | 2019-06-19 | 2019-10-22 | 五冶集团上海有限公司 | A kind of base pit dewatering well plugging device and its application method |
| CN110616727B (en) * | 2019-09-20 | 2024-08-16 | 上海广联环境岩土工程股份有限公司 | Depressurization well in deep foundation pit |
| CN111305245A (en) * | 2019-12-05 | 2020-06-19 | 中冶天工集团有限公司 | Confined water dewatering well sealing device and construction method |
| CN114703878A (en) * | 2022-05-07 | 2022-07-05 | 中建八局第二建设有限公司 | Plugging and draining device for dewatering well and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101294393A (en) * | 2007-04-29 | 2008-10-29 | 上海市第七建筑有限公司 | Construction method with dewatering water well equipped outside of foundation pit |
| CN100480475C (en) * | 2007-06-04 | 2009-04-22 | 上海地矿工程勘察有限公司 | Controllable one-well lamina precipitation construction method |
| CN103343543B (en) * | 2013-07-09 | 2015-06-24 | 中国一冶集团有限公司 | Foundation pit dewatering well pressure-reduction-type plugging method |
| CN203429649U (en) * | 2013-07-09 | 2014-02-12 | 中国一冶集团有限公司 | Pressure reducing type blocking device of foundation pit dewatering well |
| CN103758144B (en) * | 2014-02-19 | 2015-07-22 | 中亿丰建设集团股份有限公司 | Tube well used for unwatering and pressure-reducing drainage and drainage method of tube well |
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