CN105649098B - Sand hole forming method is taken suitable for the Multi-stage sleeve of medium coarse sand geology Application of light well point precipitation - Google Patents
Sand hole forming method is taken suitable for the Multi-stage sleeve of medium coarse sand geology Application of light well point precipitation Download PDFInfo
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- CN105649098B CN105649098B CN201610040351.4A CN201610040351A CN105649098B CN 105649098 B CN105649098 B CN 105649098B CN 201610040351 A CN201610040351 A CN 201610040351A CN 105649098 B CN105649098 B CN 105649098B
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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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- Hydrology & Water Resources (AREA)
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- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Sand hole forming method is taken the present invention relates to the Multi-stage sleeve suitable for medium coarse sand geology Application of light well point precipitation, is comprised the following steps：1）One-level sleeve pore-forming, 2）Two grades of casing pipe hole formings, 3）Three-level casing pipe hole forming, 4）Well-point pipe is installed, and 5）Sleeve pipe is removed；The Multi-stage sleeve of the present invention takes sand hole forming method to preferably resolve medium coarse sand geology：Level of ground water is high, water is enriched, the big base pit dewatering problem of infiltration coefficient, sand is effectively prevented to backfill well point hole by the setting of Multi-stage sleeve, the Immersed tunnel of well-point pipe can be easily accomplished, a whole set of bushing installation compares existing bath inserting tube equipment or rig cost is lower, and peace tears simple, speed of application open faster, the duration is greatly shortened, economic benefit and social benefit are notable.
Description
Technical field
It is particularly a kind of suitable for many of medium coarse sand geology Application of light well point precipitation the present invention relates to Application of light well point precipitation field
Level sleeve pipe takes sand hole forming method.
Background technology
Light well point system is mainly made up of well-point pipe, connecting tube, water header and pumping equipment etc..In foundation ditch surrounding or
Many well-point pipes of certain depth are laid in person side, and well-point pipe passes through horizontal connection tube access set by horizontal connection tube UNICOM
Pumping equipment is installed, pumping equipment can use vavuum pump or centrifugal water pump on supply mains, water header.Start pumping equipment,
In the presence of suction, underground water enters well-point pipe, connecting tube and water header through treatment hole, is discharged by drainpipe, reaches drop
The purpose of phreatic low, makes level of ground water drop to below foundation ditch bottom, meets structure construction needs.
Traditional Application of light well point precipitation is adapted to apply in the soil layers such as clay, silty clay, and construction technology is generally using bath
Well-point pipe is inserted after inserting tube pore-forming, and currently for the soil that such as near shore surficial geology is medium coarse sand matter soil layer, underground water
Abundant, water level is higher, and infiltration coefficient is larger, in loose medium coarse sand matter soil layer, and bath inserting tube pore-forming extraction pipe metapore at once can
Backfilled by sand closely knit so that well-point pipe can not be inserted；And if coordinating mud off pore-forming by rig, operate excessively multiple
Miscellaneous, input cost is larger, and it is time-consuming take a lot of work, be inconvenient；How light well point is efficiently simply carried out in medium coarse sand geology
The problem of installation of the well-point pipe of precipitation turns into the urgent need to address.
The content of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art there is provided a kind of simply efficiently to exist
The well-point pipe that Application of light well point precipitation is carried out in medium coarse sand geology takes sand forming hole method.
Following scheme is used for this present invention design：
Sand hole forming method is taken suitable for the Multi-stage sleeve of medium coarse sand geology Application of light well point precipitation, is comprised the following steps：
1) one-level casing pipe hole forming：One-level sleeve pipe is placed at well-point pipe immersed tube position, one-level sleeve pipe is in the artificial effect of rocking
Sink, it is ensured that one-level sleeve pipe is higher by the sand body of surrounding, while taking out the sand body in one-level sleeve pipe；
2) two grades of casing pipe hole formings：Two grades of sleeve pipes are inserted at the center of one-level sleeve pipe, the caliber of two grades of sleeve pipes is less than one
Level sleeve pipe caliber, and the length of two grades of sleeve pipes is more than one-level casing length；Sand equipment is taken to take out in two grades of sleeve pipes by punching
Sand body, while two grades of sleeve pipes sink under the artificial effect of rocking；
3) three-level casing pipe hole forming：When the top of two grades of sleeve pipes sinks down into one-level sleeve pipe bottom surface, stop two grades of sleeve pipe immersed tube,
Three-level sleeve pipe is inserted in two grades of sleeve pipes, the caliber of the three-level sleeve pipe is less than two grades of sleeve pipe calibers and more than well-point pipe caliber,
And the length of three-level sleeve pipe is more than two grades of casing lengths, recycling punching takes sand equipment to take out the sand body in three-level sleeve pipe, directly
Default elevation location is sunk down into three-level sleeve pipe；
4) well-point pipe is installed：Well-point pipe is inserted in three-level sleeve pipe, immersed tube to default elevation location.
5) sleeve pipe is removed：Three-level sleeve pipe, two grades of sleeve pipes and one-level sleeve pipe are extracted step by step from the inside to the outside, well-point pipe periphery sand
Well-point pipe is wrapped up closely knit by body automatically, is completed well-point pipe and is installed.
Further, the one-level sleeve pipe is length 0.5m DN300 UPVC pipes, and two grades of sleeve pipes are length 2m's
DN150 UPVC pipes, the three-level sleeve pipe is managed for long 4m DN100 UPVC.
Further, the three-level cannula tip by cord, line or silk perforate bundle, when sleeve pipe is removed by cord,
Line or silk extract three-level sleeve pipe out.
Further, in the step 4) well-point pipe install in, blocked in well-point pipe upper end.
Further, when step 1) to step 4) during when there is flour sand or silt phenomenon, in well point bottom of the tube and well
Filling grit filtering layer is filled out between point pipe and three-level sleeve pipe.
Further, after well-point pipe installation, it is compacted in being sealed below the mouth of pipe of well point at 1.0-1.5m with clay.
The beneficial effects of the present invention are：The Multi-stage sleeve of the present invention takes sand hole forming method with preferably resolving medium coarse sand
Matter：Level of ground water is high, and water is enriched, and the big base pit dewatering problem of infiltration coefficient is effectively prevented by the setting of Multi-stage sleeve
The backfill of sand, can be easily accomplished the Immersed tunnel of well-point pipe, and a whole set of bushing installation compares existing bath inserting tube equipment or brill
Hole equipment cost is lower, and peace tears simple, speed of application open faster, the duration is greatly shortened, economic benefit and social benefit are notable.
Brief description of the drawings
Just the embodiment of the present invention is described further below in conjunction with the accompanying drawings, wherein：
Fig. 1 is the FB(flow block) of the present invention；
Fig. 2 is the front view of punching sand extractor in the present invention；
Fig. 3 is the left view of punching sand extractor in the present invention；
Fig. 4 is the sectional view that sandpipe is taken in punching sand extractor.
Embodiment
The Multi-stage sleeve suitable for medium coarse sand geology Application of light well point precipitation shown in reference picture 1 takes sand hole forming method, including with
Lower step：
(1) one-level casing pipe hole forming：Make in the UPVC pipes for surveying at the well-point pipe immersed tube position set out the DN300 for placing long 0.5m
For one-level sleeve pipe, one-level sleeve pipe caliber is larger, and workmen can directly dig out the sand body in one-level sleeve pipe with spade, and sleeve pipe is in people
The work effect of rocking is sunk, and first order sleeve pipe, which should ensure that, is suitably higher by sand body around, it is to avoid surrounding sand body enters first order sleeve pipe
In cause repeat take sand.
(2) two grades of casing pipe hole formings：Two grades of sleeve pipes are inserted in one-level cannula center, two grades of sleeve pipes are long 2m DN150's
UPVC is managed, then two grades of sleeve pipes are higher by one-level box face 1.5m or so.Operating personnel insert two grades of sets using punching sand extractor is made by oneself
Sand is taken in pipe.
A kind of punching sand extractor suitable for medium coarse sand geology Application of light well point precipitation shown in reference picture 2, including take sandpipe
1, it is connected to the shadoof fixed part 2 for taking the tail end of sandpipe 1, and the shadoof 3 in shadoof fixed part 2.
It is described to take the hollow steel tube that sandpipe 1 is both ends open, shown in reference picture 3, take the half of the head end opening of sandpipe 1 to lead to
Cross welding steel 6 to block, second half of head end opening is blocked by the movable steel plate 7 of Semi-folding, the movable steel plate 7 passes through hinge
Chain is connected with welding steel 6.Shown in reference picture 3, spacing is left (about between the welding steel 6 and the head end opening for taking sandpipe 1
40mm or so), and welding steel 6 dorsad takes the head end opening of sandpipe to tilt, the surface area of welding steel 6 is less than movable steel plate
7 surface area, is conducive to the inflow of sand and the folding of movable steel plate 7.
An osculum 8 is respectively equipped with welding steel 6 and movable steel plate 7, to accelerate the draining during sand is taken.
The shadoof fixed part 2 is the hollow sleeve of both ends open, and hollow sleeve is by three steel bars 4 with taking sandpipe 1 to be welded as a whole
In coniform, handrail ring 5 is welded between three steel bars 4, hand steered decentralization or stretching during convenient construction human users, while also rising
Strengthen the effect of the globality of steel bar 4, improve intensity, prevent steel bar 4 from bending.Shown shadoof 3 may be selected bamboo pole, rod etc. and conveniently take
The material of material, shadoof 3 is assigned in constituting gap cooperation in hollow sleeve, and dismounting assembling is convenient.
Punching sand extractor is inserted in two grades of sleeve pipes when workmen uses, float (sand under sand body percussion in water
Below level of ground water), articulate steel plate is poured and taken in sandpipe by water and sand jack-up, sand and water, by carrying when product is full
Bar lifts steel cylinder, and articulate steel plate is closed downwards under gravity and sand, the active force of water, and sand is stayed in steel cylinder, and water is from taking
The welding steel of sand cylinder and the osculum on movable steel plate and gap outflow.Pour out after sand body, so repeat to twitch and take out sand body,
Two grades of sleeve pipes are also rocked under effect manually, are gradually sunk.When two grades of sleeve pipes, which sink, reaches suitable height, operating personnel can stand
Constructed on two grades of sleeve pipes, utilize increased weight sleeve pipe subsidence velocity.
(3) three-level casing pipe hole forming：When the top of two grades of sleeve pipes sinks down into one-level sleeve pipe bottom surface, stop two grades of sleeve pipes and sink
Pipe, inserts three-level sleeve pipe in two grades of sleeve pipes, and three-level sleeve pipe is long 4m DN100 UPVC pipes, then three-level sleeve pipe is higher by one-level
Box face 1.5m or so, this section cannula tip is easy to well-point pipe to extract three-level set out after installing using cord, line or silk perforation binding
Pipe.The sand fetching construction process of above-mentioned two grades of sleeve pipes punching sand extractor is repeated, until three-level sleeve pipe sinks down into designed elevation.
(4) well-point pipe is installed：By in the DN50 made UPVC well-point pipes insertion three-level sleeve pipe, immersed tube is to designing mark
It is high.The upper end of well-point pipe is blocked during installation, is entered to prevent sandstone or other debris.
The length of above-mentioned sleeve pipe at different levels can need adjustment according to practical operation, and well point length of tube is determined according to precipitation depth,
Preferably 4-6m, pipe lower end 1m length is in quincunx drilling as chimney filter, at chimney filter wall, and aperture is preferably 10-18mm, and chimney filter tube wall (is wrapped
Include bottom) filter screen of double-baging outside, internal layer is fie screen, using mesh 30-50 holes/cm2Nylon yarn cloth, brass wire gauze or raw silk
Cloth, outer leaching net is coarse strainer, using mesh 3-10 holes/cm2Nylon yarn cloth or iron wire cloth, to avoid filter opening from silting up, in tube wall
Separated between filter screen with iron wire winding curl, outer filter encloses No. 8 iron wire of a floor and makees protective layer again.
If there is flour sand, silt in the sand removal pore forming process of step (1)-(4), well-point pipe and three-level sleeve pipe it
Between and well point bottom of the tube fill out filling grit filtering layer, the thickness of sandstone filtering layer, to improve water penetration, prevents soil between 30-55mm
Grain penetrates into chimney filter, blocks the mesh of chimney filter.The packed height hyperfiltration tube top portion 1.0-1.8m of filter sand, should typically be filled to underground water
More than bit line, it is ensured that unimpeded above and below current.
(5) sleeve pipe dismounting is carried out：Extract three-level sleeve pipe, two grades of sleeve pipes and one-level sleeve pipe step by step from inside to outside, gravel is immediately
Automatically well-point pipe is wrapped up closely knit.After well-point pipe back-up sand is installed, sealed below the mouth of pipe of well point at 1.0-1.5m with clay
Mouth compacting, prevents gas leakage effect dewatering effect.
The present invention, which is proven, can fully meet existing medium coarse sand geology light-duty well-points dewatering construction requirement, such as state's electricity sea
The deep foundation pit precipitations such as the circulating lode engineering of power plant of south-southwest portion one phase, 2 × 350MW units engineering apply this Multi-stage sleeve and taken
Sand hole forming method.Factory site is located at seashore, and circulating lode Deep Foundation Pit cutting depth is 7m, and ground is downwards in the range of 11.8m
Loose to arrive slightly close medium coarse sand matter soil layer, medium coarse sand infiltration coefficient is 10m/d, phreatic line 1.8m higher than substrate.Wherein 2#
Siphonic water-collecting well foundation ditch bottom width 11.4m, long 20.9m, well-point pipe is distributed in absolute altitude for -5.0m excavation slopes position, well point length of tube 4m,
1.5m annular equidistant placements, totally 60, totally four sets of systems.2 groups of personnel are constructed, and 2 days completion well-point pipes are heavy to be set, 1 group of personnel's construction 1
It completes collector pipe and drainpipe is installed.After precipitation system installation, 3 days precipitation depths of operation are to reach design requirement, and
Normal operation, it is ensured that foundation ditch is normally excavated and structure construction.
In summary, the input cost of the inventive method is low, and speed of application is fast, and dewatering effect is good, it is ensured that well-point system
The quality of technique, with significant economic benefit and social benefit.
It is described above, it is only the present invention preferably embodiment, but the scope of the present invention is not limited thereto, it is any
Those familiar with the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in, and all should
It is included within the scope of the present invention.Therefore the scope of the present invention is defined by the protection domain of claims.
Claims (6)
1. take sand hole forming method suitable for the Multi-stage sleeve of medium coarse sand geology Application of light well point precipitation, it is characterised in that including following step
Suddenly：
1）One-level casing pipe hole forming：One-level sleeve pipe is placed at well-point pipe immersed tube position, under one-level sleeve pipe is under the artificial effect of rocking
It is heavy, it is ensured that one-level sleeve pipe is higher by the sand body of surrounding, while taking out the sand body in one-level sleeve pipe；
2）Two grades of casing pipe hole formings：Two grades of sleeve pipes are inserted at the center of one-level sleeve pipe, the caliber of two grades of sleeve pipes is less than one-level set
Pipe caliber, and the length of two grades of sleeve pipes is more than one-level casing length；Sand equipment is taken to take out the sand body in two grades of sleeve pipes by punching,
Two grades of sleeve pipes sink under the artificial effect of rocking simultaneously；
3）Three-level casing pipe hole forming：When the top of two grades of sleeve pipes sinks down into one-level sleeve pipe bottom surface, stop two grades of sleeve pipe immersed tube, two
Insertion three-level sleeve pipe in level sleeve pipe, the caliber of the three-level sleeve pipe is less than two grades of sleeve pipe calibers and is more than well-point pipe caliber, and three
The length of level sleeve pipe is more than two grades of casing lengths, and recycling punching takes sand equipment to take out the sand body in three-level sleeve pipe, until three
Level sleeve pipe sinks down into default elevation location；
4）Well-point pipe is installed：Well-point pipe is inserted in three-level sleeve pipe, immersed tube to default elevation location；
5）Sleeve pipe is removed：Three-level sleeve pipe, two grades of sleeve pipes and one-level sleeve pipe are extracted step by step from the inside to the outside, well-point pipe periphery sand body is certainly
It is dynamic that well-point pipe is wrapped up closely knit, complete well-point pipe and install.
2. the Multi-stage sleeve according to claim 1 suitable for medium coarse sand geology Application of light well point precipitation takes sand hole forming method, its
It is characterised by, the one-level sleeve pipe is managed for DN300 UPVC, two grades of sleeve pipes are managed for DN150 UPVC, the three-level sleeve pipe
Managed for DN100 UPVC.
3. the Multi-stage sleeve according to claim 1 suitable for medium coarse sand geology Application of light well point precipitation takes sand hole forming method, its
It is characterised by, the three-level cannula tip is perforated by cord, line or silk and bundled, and cord, line or silk are passed through when sleeve pipe is removed
Extract three-level sleeve pipe out.
4. the Multi-stage sleeve according to claim 1 suitable for medium coarse sand geology Application of light well point precipitation takes sand hole forming method, its
It is characterised by, in the step 4）During well-point pipe is installed, blocked in well-point pipe upper end.
5. the Multi-stage sleeve according to claim 1 suitable for medium coarse sand geology Application of light well point precipitation takes sand hole forming method, its
It is characterised by, when step 1）To step 4）During when there is flour sand or silt phenomenon, in well point bottom of the tube and well-point pipe with
Filling grit filtering layer is filled out between three-level sleeve pipe.
6. the Multi-stage sleeve according to claim 1 suitable for medium coarse sand geology Application of light well point precipitation takes sand hole forming method, its
It is characterised by, after well-point pipe installation, is compacted in being sealed below the mouth of pipe of well point at 1.0-1.5m with clay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610040351.4A CN105649098B (en) | 2016-01-21 | 2016-01-21 | Sand hole forming method is taken suitable for the Multi-stage sleeve of medium coarse sand geology Application of light well point precipitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610040351.4A CN105649098B (en) | 2016-01-21 | 2016-01-21 | Sand hole forming method is taken suitable for the Multi-stage sleeve of medium coarse sand geology Application of light well point precipitation |
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| CN105649098A CN105649098A (en) | 2016-06-08 |
| CN105649098B true CN105649098B (en) | 2017-10-10 |
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| CN201610040351.4A Active CN105649098B (en) | 2016-01-21 | 2016-01-21 | Sand hole forming method is taken suitable for the Multi-stage sleeve of medium coarse sand geology Application of light well point precipitation |
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| CN106759411A (en) * | 2017-03-14 | 2017-05-31 | 安徽水利开发股份有限公司 | Dry construction well point pipe's dmbeding method and special well point tube assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1074504A (en) * | 1992-09-25 | 1993-07-21 | 河北华兴基础公司 | Turriform awl, hand basket method pore-forming technique in boulder bed |
| CN1259606A (en) * | 1999-01-01 | 2000-07-12 | 中国有色第十五冶金建设公司第一工程公司 | Deep base pit sand pebble layer casing pipe hole forming technique |
| US6401407B1 (en) * | 1999-05-26 | 2002-06-11 | Stay-Put Safety Plate Distribution, Inc. | Cover plate ground anchor |
| CN202659205U (en) * | 2012-07-02 | 2013-01-09 | 中国石油集团西部钻探工程有限公司 | Multistage casing device |
| CN105155518A (en) * | 2015-09-01 | 2015-12-16 | 中国十七冶集团有限公司 | Safe pile-forming construction method for manual hole digging pile in quicksand lot |
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Address after: 230000 no.218, Xiangzhang Avenue, hi tech Development Zone, Hefei City, Anhui Province Patentee after: China Energy Construction Group Co.,Ltd. Address before: No. 218, Xiangzhang Avenue, high tech Zone, Hefei City, Anhui Province, 230088 Patentee before: China Energy Engineering Group Anhui No.1 Electric Power Construction Co.,Ltd. |
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