CN105544573B - Water pressure jetting type well completion construction method of dewatering tube well - Google Patents
Water pressure jetting type well completion construction method of dewatering tube well Download PDFInfo
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- CN105544573B CN105544573B CN201511024412.XA CN201511024412A CN105544573B CN 105544573 B CN105544573 B CN 105544573B CN 201511024412 A CN201511024412 A CN 201511024412A CN 105544573 B CN105544573 B CN 105544573B
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- 238000010276 construction Methods 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000005406 washing Methods 0.000 claims abstract description 47
- 238000001914 filtration Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims description 46
- 239000011148 porous material Substances 0.000 claims description 25
- 238000001556 precipitation Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000004677 Nylon Substances 0.000 claims description 8
- 238000002386 leaching Methods 0.000 claims description 8
- 229920001778 nylon Polymers 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 4
- 206010016825 Flushing Diseases 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012946 outsourcing Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract 3
- 238000005086 pumping Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Civil Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A water pressure jetting type well completion construction method of a dewatering tube well comprises steps as follows: S1, a well hole is positioned; S2, a protective barrel is produced, and jetting tubes are mounted; S3, a combined structure of the protective barrel and the jetting tubes is placed in the position of the well hole positioned in S1; S4, jetting hole forming operation is performed; S5, a water filtering well tube is mounted; S6, backfilling of an inverted filter material is performed; S7, the protective barrel and the two jetting tubes are pulled out of the well hole; S8, well washing is performed; S9, a submersible pump and a water outlet pipe are mounted, and test pumping is performed. The well completion construction method meets construction requirements of construction sites having various terrain conditions, the construction cost is reduced, and the construction efficiency is improved.
Description
Technical field
The invention belongs to precipitation tube well construction technical field, the hydraulic pressure spouting Cheng Jing of more particularly to a kind of precipitation pipe well is applied
Work method.
Background technology
Tube well dewatering is a kind of precipitation method the most frequently used in current engineering construction, and so-called tube well dewatering is referred to and planned to build
A number of pipe well is arranged around Deep Foundation Pit and at a certain distance in the middle of foundation ditch, water pump is installed in pipe well, uninterruptedly
Groundwater abstraction, makes the groundwater level in foundation ditch be consistently lower than a kind of precipitation method of foundation ditch operating surface.This kind of precipitation method
With well spacing it is big, drainage effect is good, separate many well points, precipitation apparatus and operating procedure are simple, the low feature of engineering cost,
It is widely used in all kinds of deep foundation pit precipitation engineerings, is particularly suited for larger infiltration coefficient, precipitation position relatively depth and contains with pressure-bearing
The deep-foundation pit engineering of water layer.
At present, the construction technology process that precipitation pipe well is generally adopted into well for：Surveying setting-out, determine pipe well position → rig
It is in place, impact into well → hang filtrate → well-flushing → installing submersible pump and outlet pipe backfilled around well casing → well casing, and tried
Draw water.After completing above-mentioned work, you can carry out tube well dewatering operation.
The construction technology of above-mentioned precipitation pipe well Cheng Jing is applied to general common base pit dewatering, but applies for some are special
Work project, for example：The foundation construction of works in farm irrigation facility construction is related to precipitation problem mostly, and tube well dewatering is required
Just there is certain flatness construction site when needing rig operation, but newly-built structure thing quantity is more in farmland water conservancy works and divides
Dissipate, terrain is mostly uneven, flatness is difficult to meet and requires.Solution be construction site is carried out it is smooth, fully
Meet the requirement of rig drilling well precipitation in place, this method economy is bad, and require machinery construction equipment turning round
Move, have a strong impact on the duration.Another kind of solution is to arrange bright ditch precipitation, i.e., dig four bright ditches deeper than foundation ditch in foundation ditch surrounding
Carry out precipitation.This methods engineering amount will be bigger, relatively more using main equipment, and for this scattered hydraulic engineering
Make in this way, either economy or dewatering effect are all poor.
The content of the invention
The present invention provides a kind of applying suitable for various orographic conditions to solve technical problem present in known technology
Workshop, the hydraulic pressure spouting for reducing construction cost with the precipitation pipe well for improving efficiency of construction is into well construction method.
The present invention is adopted the technical scheme that to solve technical problem present in known technology：
A kind of hydraulic pressure spouting of precipitation pipe well is into well construction method, it is characterised in that including following construction procedure：
S1 wellholes are positioned：Unwrapping wire positioning is carried out according to well location design；
S2 makes casing and installs spray washing pipe：
Casing is circumferentially closing and two ends are the structure of opening, setting is evenly distributed on the side wall of casing multigroup
Intercommunicating pore, every group of intercommunicating pore by up and down successively by spacing arrangement multiple intercommunicating pores constitute, positioned at foot intercommunicating pore with
The distance between bottom of casing is 0.15～0.20m；
Spray washing pipe is two, and two spray washing pipes are the right-angle elbow pipe structure of equivalent, and washing pipe is sprayed per root by vertical segment and transverse tube
Section is constituted, and two spray washing pipes are symmetrically fixed on casing inwall, and the lower end of the vertical segment of two spray washing pipes is located at casing bottom
Top and be 0.4～0.6m with the distance of casing bottom, the horizontal segment of two spray washing pipes is stretched out from the top of casing；
The combining structure of casing and two spray washing pipes is placed in S3 the wellbore locations being positioned in S1 using hanging device；
S4 carries out spraying punching perforation operation：
The horizontal segment of two spray washing pipes is connected respectively by rotary hose with the immersible pump put in channel, opens immersible pump,
Water carries out spray punching through rotary hose and two spray washing pipes towards the bottom of casing, makes the mud that is internally formed of casing, mud pass through casing
Top and barrel on intercommunicating pore outside arrange, with the outer row of mud, casing and two spray washing pipes be gradually reduced, formed wellhole；
S5 installs water-filtering well tube：
First prefabricated water-filtering well tube, water-filtering well tube is made up of body and nylon leaching net two parts, and body selects pvc pipe, body
Bottom is sealed, and on the hypomere of body permeable hole is distributed, and nylon leaching net outsourcing is arranged the pipeline section of permeable hole on body
On, form water-filtering well tube structure；Then water-filtering well tube is hoisted to into casing center by lifting appliance to be positioned, and under
Borehole bottom is put into, artificial school is aside carried out partially by workman in decentralization process, control water-filtering well tube steadily enters hole；
S6 backfills filter material：
Using 6～8mm particle diameter coarse sand filter materials, slowly it is uniformly filled in around water-filtering well tube, filter material thickness is not less than
100mm, filter material is backfilled to till the well head 0.5m；
S7 hanging devices extract casing and two spray washing pipes from wellhole；
S8 well-flushings：
Drawn water from neighbouring feed ditch well-flushing using water pump, it is desirable to be washed till out clear water, while measuring depth in well meets design
Require；
S9 installing submersible pumps and outlet pipe, and carry out examination and draw water：
Immersible pump is arranged on middle part position on the lower side in water-filtering well tube, and the pump housing is installed will be stablized, and pump shaft is vertical；Outlet pipe is adopted
With sebific duct, the upper end of outlet pipe is stretched out from the top of water-filtering well tube, and the lower end of outlet pipe is connected with the delivery port of immersible pump；Connect
Power supply and control circuit, it is qualified on inspection after carry out examination and draw water, determine the SEA LEVEL VARIATION in the flow and observation well casing of pumped well,
So far the whole work progress of precipitation pipe well Cheng Jing is completed.
The technical scheme that the present invention may also take on is：
By the steel sheet pile that four block lengths are 4m, circumferentially successively welding is constituted casing in S2, and the thickness of steel sheet pile is not less than
8.3mm, or casing is made up of 8～10mm, internal diameter of 4m, thickness of length of the steel cylinder of 1m；Spray washing pipe in S2 by
Caliber is made up of 50mm, wall thickness of the steel pipe of 3mm, and the length for spraying the vertical segment of washing pipe is 3.5m, and the length of horizontal segment is 0.5m.
A diameter of 0.4m of the PVC of well casing is made in S5, the length that the pipeline section of permeable hole is arranged on well casing is 3m.
The quantity of the intercommunicating pore of every group of intercommunicating pore in S2 on casing is 5, a diameter of 30mm of intercommunicating pore, adjacent connection
Spacing between hole is 0.75m.
The present invention has the advantages and positive effects that：
This construction method brings the shaping for realizing wellhole using hydraulic pressure spray, carries out compared to existing employing large type drill
The mode of wellhole shaping, on the one hand save main equipment uses the transhipment back and forth for putting into and avoiding main equipment, reduces
Construction cost and efficiency of construction is improve, on the other hand construction relatively flexibly, to the flatness of construction site does not have too high
Require, it therefore meets the construction requirement of the construction site of various orographic conditions.In addition, casing and spray washing pipe combining structure can
It is repeated multiple times to use, so, further reduce construction cost.
Description of the drawings
Fig. 1 is the schematic diagram that spray is washed into that each several part coordinates during well；
Fig. 2 is the combination diagram of casing and spray washing pipe.
In figure：1st, casing；1-1, intercommunicating pore；2nd, washing pipe is sprayed；2-1, vertical segment；2-2, horizontal segment；3rd, water-filtering well tube；3-1、
Body；3-1-1, permeable hole；3-2, nylon leaching net；4th, filter material；5th, immersible pump；6th, outlet pipe.
Specific embodiment
For the content of the invention, feature and effect of the present invention can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing
Describe in detail as follows：
Refer to Fig. 1 and 2, a kind of hydraulic pressure spouting of precipitation pipe well is into well construction method, including following construction procedure：
S1 wellholes are positioned：Unwrapping wire positioning is carried out according to well location design.
S2 makes casing 1 and installs spray washing pipe 2：
The shape and structure of casing is：Circumferentially close and two ends are opening shape, be evenly distributed on the side wall of casing and set
Multigroup intercommunicating pore is put, every group of intercommunicating pore is made up of the multiple intercommunicating pore 1-1 for arranging by spacing successively up and down, positioned at the company of foot
The distance between bottom of through hole and casing is 0.15～0.20m；
Spray washing pipe is two, and two spray washing pipes are the right-angle elbow pipe structure of equivalent, and washing pipe is sprayed per root by vertical segment 2-1 and horizontal stroke
Pipeline section 2-2 is constituted, and wherein the length of vertical segment is more than the length of horizontal segment, and two spray washing pipes are symmetrically fixed by modes such as welding
On casing inwall, the lower end of the vertical segment of two spray washing pipes is located at the top of casing bottom and is with the distance of casing bottom
0.4～0.6m, so, rushes one section of spray of formation between lower end of duct and the bottom of casing and rushes working space in spray.Two spray washing pipes
Horizontal segment stretch out from the top of casing.
The combining structure of casing and two spray washing pipes is placed in S3 the wellbore locations being positioned in S1 using hanging device.
S4 carries out spraying punching perforation operation：
The horizontal segment end of two spray washing pipes is connected respectively by rotary hose with the immersible pump put in channel, opens diving
Pump, water carries out spray punching through rotary hose and two spray washing pipes towards the bottom of casing, makes the mud that is internally formed of casing, and mud is by shield
Arrange outside intercommunicating pore on the top of cylinder and barrel, with the outer row of mud, casing and two spray washing pipes are gradually reduced, and form well
Hole.It is to determine the speed that casing force declines by spraying stream and the speed of row outside mud in washing pipe that operation is rushed in this spray, under casing
During drop, need to ensure that casing vertically declines.
S5 installs water-filtering well tube：
First prefabricated water-filtering well tube 3：Water-filtering well tube is made up of body 3-1 and nylon leaching net 3-2 two parts, and body selects PVC
Pipe, its bottom is sealed, and permeable hole 3-1-1 is distributed on the hypomere of body, and nylon leaching net outsourcing is arranged on body
On the pipeline section of permeable hole, water-filtering well tube structure is formed；Then water-filtering well tube is hoisted to by casing center by lifting appliance
Positioned, and transferred to borehole bottom, artificial school is aside carried out partially by workman in decentralization process, control water-filtering well tube is put down
Surely enter hole.
S6 backfills filter material：
Using 6～8mm particle diameter coarse sand filter materials, slowly it is uniformly filled in around water-filtering well tube, the thickness of filter material 4 is not less than
100mm, filter material is backfilled to till the well head 0.5m.
S7 hanging devices extract casing and two spray washing pipes from wellhole；
S8 well-flushings：
Drawn water from neighbouring feed ditch well-flushing using water pump, it is desirable to be washed till out clear water, while measuring depth in well meets design
Require；
S9 installing submersible pumps 5 and outlet pipe 6, and carry out examination and draw water：
Immersible pump is arranged on middle part position on the lower side in water-filtering well tube, and the pump housing is installed will be stablized, and pump shaft is vertical；Outlet pipe is adopted
With sebific duct, the upper end of outlet pipe is stretched out from the top of water-filtering well tube, and the lower end of outlet pipe is connected with the delivery port of immersible pump；Connect
Power supply and control circuit, it is qualified on inspection after carry out examination and draw water, determine the SEA LEVEL VARIATION in the flow and observation well casing of pumped well,
So far the whole work progress of precipitation pipe well Cheng Jing is completed.
In above-mentioned construction method, the casing in S2 preferably adopts two kinds of structures：The first structure is：Casing is by four block lengths
For the steel sheet pile of 4m, circumferentially successively welding is constituted, and the thickness of steel sheet pile is not less than 8.3mm；Second structure：Casing is by length
It is made up of the steel cylinder of 1m of 8～10mm, internal diameter of 4m, thickness.Each spray washing pipe in S2 is 50mm, wall preferably by caliber
Thickness is made up of the steel pipe of 3mm, and the length for spraying the vertical segment of washing pipe is 3.5m, and the length of horizontal segment is 0.5m.
In above-mentioned construction method, the diameter that the PVC of body is made in S5 is preferably 0.4m, and the pipe of permeable hole is arranged on body
The length of section is preferably 3m, and so, the packages length to body of nylon leaching net is also 3m.
In above-mentioned construction method, the quantity of the intercommunicating pore of every group of intercommunicating pore being arranged in S2 on casing is 5, intercommunicating pore
A diameter of 30mm, the spacing between adjacent intercommunicating pore be 0.75m.
The foregoing is only the present invention better embodiment, not for limit the present invention practical range.It is i.e. all according to
The equivalence changes that the content of scope of the present invention patent is done and modification, each fall within the technical scope of the present invention.
Claims (4)
1. a kind of hydraulic pressure spouting of precipitation pipe well is into well construction method, it is characterised in that including following construction procedure：
S1 wellholes are positioned：Unwrapping wire positioning is carried out according to well location design；
S2 makes casing and installs spray washing pipe：
Casing is circumferentially closing and two ends are the structure of opening, and the multigroup connection of setting is evenly distributed on the side wall of casing
Hole, every group of intercommunicating pore is constituted by the multiple intercommunicating pores arranged by spacing successively up and down, positioned at the intercommunicating pore and casing of foot
The distance between bottom be 0.15～0.20m；
Spray washing pipe is two, and two spray washing pipes are the right-angle elbow pipe structure of equivalent, and washing pipe is sprayed per root by vertical segment and horizontal segment structure
Into, two spray washing pipes are symmetrically fixed on casing inwall, the lower end of the vertical segment of two spray washing pipes be located at casing bottom top,
And with the distance of casing bottom be 0.4～0.6m, the horizontal segment of two spray washing pipes is stretched out from the top of casing；
The combining structure of casing and two spray washing pipes is placed in S3 the wellbore locations being positioned in S1 using hanging device；
S4 carries out spraying punching perforation operation：
The horizontal segment of two spray washing pipes is connected respectively by rotary hose with the immersible pump put in channel, opens immersible pump, water Jing
Cross rotary hose and two spray washing pipes carries out spray punching towards the bottom of casing, makes the mud that is internally formed of casing, the top that mud passes through casing
Arrange outside intercommunicating pore in portion and barrel, with the outer row of mud, casing and two spray washing pipes are gradually reduced, and form wellhole；
S5 installs water-filtering well tube：
First prefabricated water-filtering well tube, water-filtering well tube is made up of body and nylon leaching net two parts, and body selects pvc pipe, its bottom
Sealed, on the hypomere of body permeable hole is distributed, on the pipeline section that nylon leaching net outsourcing is arranged into permeable hole on body, shape
Into water-filtering well tube structure；Then water-filtering well tube is hoisted to into casing center by lifting appliance to be positioned, and is transferred to
Borehole bottom, artificial school is aside carried out partially in decentralization process by workman, and control water-filtering well tube steadily enters hole；
S6 backfills filter material：
Using 6～8mm particle diameter coarse sand filter materials, slowly it is uniformly filled in around water-filtering well tube, filter material thickness is not less than
100mm, filter material is backfilled to till the well head 0.5m；
S7 hanging devices extract casing and two spray washing pipes from wellhole；
S8 well-flushings：
Drawn water from neighbouring feed ditch well-flushing using water pump, it is desirable to be washed till out clear water, while measuring depth in well meets design requirement；
S9 installing submersible pumps and outlet pipe, and carry out examination and draw water：
Immersible pump is arranged on middle part position on the lower side in water-filtering well tube, and the pump housing is installed will be stablized, and pump shaft is vertical；Outlet pipe adopts glue
Pipe, the upper end of outlet pipe is stretched out from the top of water-filtering well tube, and the lower end of outlet pipe is connected with the delivery port of immersible pump；Connect power supply
And control circuit, it is qualified on inspection after carry out examination and draw water, determine the SEA LEVEL VARIATION in the flow and observation well casing of pumped well, so far
Complete the whole work progress of precipitation pipe well Cheng Jing.
2. the hydraulic pressure spouting of precipitation pipe well according to claim 1 is into well construction method, it is characterised in that：Shield in S2
By four block lengths, for the steel sheet pile of 4m, circumferentially successively welding is constituted cylinder, and the thickness of steel sheet pile is not less than 8.3mm, or casing by
Length is made up of 8～10mm, internal diameter of 4m, thickness of the steel cylinder of 1m；Spray washing pipe in S2 is that 50mm, wall thickness are by caliber
The steel pipe of 3mm is made, and the length for spraying the vertical segment of washing pipe is 3.5m, and the length of horizontal segment is 0.5m.
3. the hydraulic pressure spouting of precipitation pipe well according to claim 2 is into well construction method, it is characterised in that：Make in S5
A diameter of 0.4m of the PVC of body, the length that the pipeline section of permeable hole is arranged on body is 3m.
4. the hydraulic pressure spouting of precipitation pipe well according to claim 2 is into well construction method, it is characterised in that：Casing in S2
On the quantity of intercommunicating pore of every group of intercommunicating pore be 5, a diameter of 30mm of intercommunicating pore, the spacing between adjacent intercommunicating pore is
0.75m。
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| CN201511024412.XA CN105544573B (en) | 2015-12-29 | 2015-12-29 | Water pressure jetting type well completion construction method of dewatering tube well |
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| CN201511024412.XA CN105544573B (en) | 2015-12-29 | 2015-12-29 | Water pressure jetting type well completion construction method of dewatering tube well |
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| CN105544573B true CN105544573B (en) | 2017-05-10 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759409B (en) * | 2016-11-07 | 2019-02-26 | 中铁三局集团广东建设工程有限公司 | A kind of water-rich sand layer regional precipitation well construction method |
| CN109441355A (en) * | 2019-01-03 | 2019-03-08 | 上海市水利工程集团有限公司 | Silt or sand bed pipe well high pressure water flushing fast pore-creating construction method |
| CN110093941A (en) * | 2019-04-25 | 2019-08-06 | 中铁十二局集团有限公司 | Deep foundation pit precipitation construction method |
| CN112983428B (en) * | 2021-02-20 | 2023-03-14 | 上海市政工程设计研究总院（集团）有限公司 | Method for building underground water environment monitoring well |
| CN114319403A (en) * | 2022-01-21 | 2022-04-12 | 中水华通工程有限公司 | Construction method for quick well formation of quicksand geological formations |
| CN115064049A (en) * | 2022-05-17 | 2022-09-16 | 山东省地质矿产勘查开发局八〇一水文地质工程地质大队(山东省地矿工程勘察院) | Physical model test system and method for simulation of dewatering well construction process |
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|---|---|---|---|---|
| CN202031102U (en) * | 2011-03-25 | 2011-11-09 | 中国二十冶集团有限公司 | Manual punching device for dewatering well point |
| CN104762981A (en) * | 2015-02-16 | 2015-07-08 | 中交一航局第一工程有限公司 | Hole forming method of precipitation well |
| CN104975611A (en) * | 2015-07-17 | 2015-10-14 | 河北二十冶建设有限公司 | Sinking device and method for well point drawdown pipe of liquid soil layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6245499B2 (en) * | 2013-06-04 | 2017-12-13 | 株式会社大林組 | Groundwater level lowering system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202031102U (en) * | 2011-03-25 | 2011-11-09 | 中国二十冶集团有限公司 | Manual punching device for dewatering well point |
| CN104762981A (en) * | 2015-02-16 | 2015-07-08 | 中交一航局第一工程有限公司 | Hole forming method of precipitation well |
| CN104975611A (en) * | 2015-07-17 | 2015-10-14 | 河北二十冶建设有限公司 | Sinking device and method for well point drawdown pipe of liquid soil layer |
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