CN108060677A - A kind of positive/negative-pressure of Landfill precipitation strengthens pump drainage shaft structure and construction method - Google Patents
A kind of positive/negative-pressure of Landfill precipitation strengthens pump drainage shaft structure and construction method Download PDFInfo
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- CN108060677A CN108060677A CN201711250830.XA CN201711250830A CN108060677A CN 108060677 A CN108060677 A CN 108060677A CN 201711250830 A CN201711250830 A CN 201711250830A CN 108060677 A CN108060677 A CN 108060677A
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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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- General Engineering & Computer Science (AREA)
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- Structures Of Non-Positive Displacement Pumps (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of positive/negative-pressure the invention discloses Landfill precipitation strengthens pump drainage shaft structure and construction method.The structure vertical shaft well casing is made of the become a mandarin sand setting section of section and hypomere not perforate of the negative pressure ventilation seal section of epimere not perforate, the percolate of stage casing perforate.Well casing material is coating steel pipe, has good corrosion-resistant and anti-deformation.Vertical shaft is completed by excavating pore-forming, decentralization well casing and steel reinforcement cage, filling sealing and filtration material, the processes construction of installation draw water pipeline and pumping/gas injection pipeline, wellhead sealing and well-flushing etc..When immersible pump is used to draw water, negative pressure ventilation is carried out at the same time vertical shaft, using high negative pressure effect increase percolate seepage flow gradient in well, while is weakened landfill gas to percolate seepage flow retardation, is achieved the purpose that improve vertical shaft working performance.Vertical shaft operation a period of time generate silting after, can by into well positive pressure gas injection wash away sieve pore dredging, recover its pump drainage performance.
Description
Technical field
The present invention relates to percolate from garbage filling field water level control fields, and in particular to a kind of Landfill precipitation
Positive/negative-pressure strengthen pump drainage shaft structure and construction method.
Background technology
Refuse landfill in the process of running, since rainfall infiltration and the effect of landfill waste auto-degradation can be generated and largely oozed
Filtrate.Compared with the low rubbish from cooking of the developed countries such as America and Europe, the high rubbish from cooking in China due to initial aqueous rate high (40-60%),
The reasons such as food waste content height (61.6%) cause percolate yield high (51%).In rubbish day amount of landfill larger (5000~10000
Ton day) on the basis of, landfill waste can generate a large amount of percolates (2500~5000 ton day).Due to bottom rubbish infiltration coefficient
The reasons such as relatively low and lead layer silting, a large amount of percolates of generation can not effectively guide and deposit in junk-heap body, cause rubbish
The universal harmony of rubbish heap body leachate level is high.Junk-heap body leachate level harmony height seriously affects landfill yard safe operation, easily lures
Send out the three overall situation disasters that fluent junk-heap body unstability, underground water and soil pollution and landfill gas can not be collected effectively.
To ensure the safe operation of refuse landfill, need to adopt an effective measure reduces junk-heap body water level.For percolate
The landfill yard of guide system silting mostly reduces leachate level using pump drainage vertical shaft.It was dropped in the past for junk-heap body
Traditional pump drainage vertical shaft of water does not have negative pressure ventilation and a positive pressure gas injection system, vertical shaft in the process of running, since silting occurs for well casing
And the liquid gas conduction mutually reasons such as retardance cause the smaller (only 20~30m of flow that draws water3/ day) and the radius of influence limited (about 20
~30m), it is difficult to meet heap body water level control requirement.
The content of the invention
In order to overcome the problems, such as that traditional percolate pump drainage vertical shaft pump drainage effect is poor, the present invention provides a kind of using high negative in well
Pressure effect increase percolate seepage flow gradient, while weaken reinforcing pump drainage shaft structure of the landfill gas to percolate seepage flow retardation
And construction method.If the structure vertical shaft washes away sieve pore dredging after operation a period of time generates silting by positive pressure gas injection, extend
Its service life can be widely used in the water level control of the excessively high landfill yard of leachate level.
To achieve the above object, the technical solution adopted in the present invention is as follows：A kind of Landfill precipitation is just
Negative pressure strengthens pump drainage shaft structure, and well casing epimere is the coating steel pipe of not perforate, as negative pressure ventilation seal section, with rubbish around
Sealing material is filled between heap body；Stage casing is the coating steel pipe of perforate, is become a mandarin section as percolate；Hypomere is zinc-plated for not perforate
Steel pipe, as sand setting section；Bottom blocks；It is sealed at the top of well casing by blocking blank flange；Well casing stage casing and hypomere coating steel pipe
Filtration material is filled between junk-heap body around, the filtration material is followed successively by from inside to outside：Earthwork water drain net, 25~40mm
Hard rubble or cobble, direction earthwork grille；It is connected between every section of well casing using bump joint；From upper in the packing material of well casing
Run through steel reinforcement cage to lower；Well casing percolate become a mandarin section bottom be equipped with immersible pump, outlet pipe one end connection immersible pump, the other end
It is pierced by from closure blank flange, outlet pipe is sequentially ingressed into filter, gate valve, flowmeter after being pierced by after, accesses guide branch pipe；Well casing
The side wall for stretching out heap body surface face is provided with blow vent, and blow vent connects vacuum pump assembly, air compressor by pipeline respectively.
Further, the sealing material of the well casing epimere filling is viscous to mix the bentonitic compactings of mass fraction 5%-20%
Soil.
Further, the earthwork water drain net is single side composite earthwork cloth.
Further, the immersible pump uses explosion-proof electric immersible pump or pneumatic diaphragm pump.
Further, a diameter of 200-500mm of the well casing, sealing segment length are no less than 8m；Percolate becomes a mandarin the opening of section
Bore dia 10-30mm, length 10-25m；Sand setting segment length is 1m.
Further, the vacuum pump assembly provides negative pressure into well, and using one auxiliary two sets of vacuum pumps of master, main pump uses
Water-jet pump, auxiliary pump start in main pump rate of air sucked in required deficiency or after working long hours.
Further, the air compressor provides positive pressure into well, using vortex air compressor machine, including fixed scroll, moves
Whirlpool disk, cross slip-ring, main shaft, rack.
A kind of positive/negative-pressure of Landfill precipitation strengthens the construction method of pump drainage shaft structure, including following step
Suddenly：
(1) it is drilled in designated position using cylinder and excavates pore-forming, depth of pore forming is than design Masaru Ibuka 1m；
(2) after the completion of pore-forming, the method that bottom is hung by steel cable transfers well casing section by section；
(3) put after well casing to shaft bottom, transfer steel reinforcement cage；
(4) righting well casing, well casing and around between junk-heap body layering be sequentially filled filtration material, sealing material；
(5) after immersible pump connection outlet pipe, transfer to designated depth, outlet pipe access guide branch pipe；
(6) blow vent connects vacuum pump assembly, air compressor respectively；
(7) well mouth seal structure is installed；
(8) vertical shaft is after installation is complete, using compressed air well-flushing.
The invention has the advantages that：
1) find to compare with traditional pump drainage vertical shaft through live prolonged application, positive/negative-pressure strengthens pump drainage vertical shaft in equal conditions
Under draw water flow bigger (80~100m3/ day), and the radius of influence is farther (30~50m)；
2) well casing epimere is not perforate coating steel pipe, and the bentonitic clay compactions of mass fraction 5%-20% are mixed in the filling of well week
Sealing, and seal segment length and be no less than 8m, it so can guarantee good air-tightness, ensure the realization of high negative pressure in well；
3) found through live prolonged application, it is rational in infrastructure that well casing stage casing and hypomere fill filtration material, can preferably prolong
The generation and development of slow silting, extend vertical shaft service life；
4) in the case where well casing generates part silting, by into well positive pressure gas injection wash away sieve pore dredging and can recover its pump drainage energy
Power；
5) well casing has good resistance to diafiltration corrosion and anti-heap body sliding deformation ability using coating steel pipe.
Description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the 1-1 sectional views in Fig. 1；
In figure：1st, the coating steel pipe of not perforate, 2, the coating steel pipe of perforate, 3, bump joint, 4, steel reinforcement cage, 5, compacting it is viscous
Soil, 6, earthwork water drain net, 7, hard rubble or cobble, 8, direction earthwork grille, 9, outlet pipe, 10, immersible pump, 11, antiseepage soil
Work film, 12, junk-heap body, 13, filter, 14, gate valve, 15, flowmeter, 16, guide branch pipe, 17, vacuum pump assembly, 18, empty
Air compressor, 19, closure blank flange.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, 2, positive/negative-pressure of the invention strengthens the coating steel pipe 1 that pump drainage vertical shaft well casing epimere is not perforate, makees
The bentonitic clay compactions 5 of mass fraction 5%-20% are mixed in filling between negative pressure ventilation seal section, with junk-heap body 12 around
Sealing；Stage casing is the coating steel pipe 2 of perforate, is become a mandarin section as percolate；Hypomere is the coating steel pipe of not perforate, as sand setting
Section；Bottom blocks；It is sealed at the top of well casing by blocking blank flange 19；Well casing stage casing and hypomere coating steel pipe and surrounding rubbish heap
Filtration material is filled between body 12, the filtration material is followed successively by from inside to outside：Earthwork water drain net 6,25~40mm hard rubbles
Or cobble 7, direction earthwork grille 8；It is connected between every section of well casing using bump joint 3；In the packing material of well casing from top to bottom
Through steel reinforcement cage 4；Well casing percolate become a mandarin section bottom be equipped with immersible pump 10,9 one end of outlet pipe connection immersible pump, the other end
It is pierced by from closure blank flange 19, outlet pipe is sequentially ingressed into filter 13, gate valve 14, flowmeter 15 after being pierced by after, into guide
Branch pipe 16；The side wall that well casing stretches out heap body surface face is provided with blow vent, and blow vent connects vacuum pump assembly 17, sky by pipeline respectively
Air compressor 18.
The work progress of the structure vertical shaft is as follows：
(1) it is drilled in designated position using cylinder and excavates pore-forming, depth of pore forming is than design Masaru Ibuka 1m；
(2) after the completion of pore-forming, the method that bottom is hung by steel cable transfers well casing section by section；
(3) put after well casing to shaft bottom, transfer steel reinforcement cage 4.4 a diameter of 750mm of steel reinforcement cage, the same depth of pore forming of length；It is main
The a diameter of 18mm of muscle, circumferentially uniformly 12；Tie hoop diameter 12mm, spacing 150mm；Hoop diameter 14mm is positioned,
Away from for 2000mm；
(4) righting well casing, well casing and around between junk-heap body 12 layering be sequentially filled sealing and filtration material；Wherein
It is swollen to mix mass fraction 5%-20% that sealing material is filled between well casing epimere not perforate coating steel pipe 1 and surrounding junk-heap body 12
Moisten soil compaction clay 5；Filtration material is filled between well casing stage casing and hypomere coating steel pipe and surrounding junk-heap body 12 by introversion
It is followed successively by outside：Earthwork water drain net 6,25~40mm hard rubble or cobble 7 and direction earthwork grille 8；
(5) after 10 connection diameter 63mm outlet pipes 9 of immersible pump, transfer to designated depth；Outlet pipe 9 from closure blank flange
19 are pierced by, aperture seal processing；Outlet pipe 9 is sequentially ingressed into filter 13, gate valve 14, flowmeter 15 after being pierced by after, guide is accessed
Branch pipe 16；Due to the presence of landfill gas in junk-heap body 12, immersible pump 10 should use explosion-proof electric immersible pump or pneumatic diaphragm
Pump；
(6) blow vent connects vacuum pump assembly 17, air compressor 18 respectively；Vacuum pump assembly 17 is using a master one auxiliary two
Vacuum pump assembly is covered, main pump uses water-jet pump, has favorable anti-corrosion effect, smokable particle media and gas-liquid mixed
The advantages that object, higher vacuum degree；Auxiliary unit starts in host groups rate of air sucked in required deficiency or after working long hours；Air compressor 18
It using vortex air compressor machine, is made of the key fitments such as fixed scroll and movable orbiting scroll, cross slip-ring, main shaft, rack, there is mechanism letter
The advantages that single, small, light-weight, few easy workout part, volumetric efficiency are higher, mechanical efficiency is higher；
(7) well mouth seal structure, side tight anti-seepage geomembrane 11 are installed；
(8) shaft structure is after installation is complete, using compressed air well-flushing.
Construction of Silo is drawn water in the following way after installation is complete：Opening immersible pump 10 switchs and gate valve 14, makes to ooze
Filtrate flows into percolate treatment plant after outlet pipe 9, filter 13, gate valve 14, flowmeter 15 and guide branch pipe 16.That draws water is same
When open vacuum pump assembly 17 its made to carry out negative pressure ventilation work, high negative pressure increase percolate seepage flow gradient is formed in well, together
When weaken landfill gas to percolate seepage flow retardation, achieve the purpose that increase is drawn water flow and the radius of influence, work negative pressure is suitable
It is arranged to -3~-7kPa.
If vertical shaft draws water, it is apparent to find that flow reduces afterwards for a period of time for work, may be fine grained invasion well week in rubbish
Generate silting.Immersible pump 10 and vacuum pump assembly 17 should be closed at this time, open air compressor 18, sieve is washed away by positive pressure gas injection
Hole dredging makes shaft recovery well draw water performance；After the completion of positive pressure gas injection dredging process, pump process is repeated.
Above-described is only presently preferred embodiments of the present invention, is not intended to limit the invention, all in the scope of the present invention
Within, any modification for being made, equivalence replacement etc. should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of positive/negative-pressure of Landfill precipitation strengthens pump drainage shaft structure, which is characterized in that well casing epimere is not
The coating steel pipe of perforate fills sealing material as between negative pressure ventilation seal section, with junk-heap body around；Stage casing is perforate
Coating steel pipe becomes a mandarin section as percolate；Hypomere is the coating steel pipe of not perforate, as sand setting section；Bottom blocks；At the top of well casing
It is sealed by blocking blank flange；Filtration material, institute are filled between well casing stage casing and hypomere coating steel pipe and surrounding junk-heap body
Filtration material is stated to be followed successively by from inside to outside：Earthwork water drain net, 25~40mm hard rubble or cobble, direction earthwork grille；Well casing
It is connected between every section using bump joint；Run through steel reinforcement cage in the packing material of well casing from top to bottom；It becomes a mandarin in well casing percolate
The bottom of section is equipped with immersible pump, and outlet pipe one end connection immersible pump, the other end is pierced by from closure blank flange, after outlet pipe is pierced by
After being sequentially ingressed into filter, gate valve, flowmeter, guide branch pipe is accessed；The side wall that well casing stretches out heap body surface face is provided with blow vent, leads to
Gas port connects vacuum pump assembly, air compressor by pipeline respectively.
2. the positive/negative-pressure of Landfill precipitation according to claim 1 strengthens pump drainage shaft structure, feature exists
In the sealing material of the well casing epimere filling is to mix the bentonitic clay compactions of mass fraction 5%-20%.
3. the positive/negative-pressure of Landfill precipitation according to claim 1 strengthens pump drainage shaft structure, feature exists
In the earthwork water drain net is single side composite earthwork cloth.
4. the positive/negative-pressure of Landfill precipitation according to claim 1 strengthens pump drainage shaft structure, feature exists
In immersible pump uses explosion-proof electric immersible pump or pneumatic diaphragm pump.
5. the positive/negative-pressure of Landfill precipitation according to claim 1 strengthens pump drainage shaft structure, feature exists
In a diameter of 200-500mm of well casing, sealing segment length is no less than 8m；Percolate becomes a mandarin the opening diameter 10-30mm of section, length
For 10-25m；Sand setting segment length is 1m.
6. the positive/negative-pressure of Landfill precipitation according to claim 1 strengthens pump drainage shaft structure, feature exists
In vacuum pump assembly provides negative pressure into well, and using one auxiliary two sets of vacuum pumps of master, main pump uses water-jet pump, auxiliary
Pump starts in main pump rate of air sucked in required deficiency or after working long hours.
7. the positive/negative-pressure of Landfill precipitation according to claim 1 strengthens pump drainage shaft structure, feature exists
In, air compressor provides positive pressure into well, using vortex air compressor machine, including fixed scroll, movable orbiting scroll, cross slip-ring, main shaft,
Rack.
8. a kind of positive/negative-pressure of Landfill precipitation strengthens the construction method of pump drainage shaft structure, which is characterized in that bag
Include following steps：
(1) it is drilled in designated position using cylinder and excavates pore-forming, depth of pore forming is than design Masaru Ibuka 1m；
(2) after the completion of pore-forming, the method that bottom is hung by steel cable transfers well casing section by section；
(3) put after well casing to shaft bottom, transfer steel reinforcement cage；
(4) righting well casing, well casing and around between junk-heap body layering be sequentially filled filtration material, sealing material；
(5) after immersible pump connection outlet pipe, transfer to designated depth, outlet pipe access guide branch pipe；
(6) blow vent connects vacuum pump assembly, air compressor respectively；
(7) well mouth seal structure is installed；
(8) vertical shaft is after installation is complete, using compressed air well-flushing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711250830.XA CN108060677A (en) | 2017-12-01 | 2017-12-01 | A kind of positive/negative-pressure of Landfill precipitation strengthens pump drainage shaft structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711250830.XA CN108060677A (en) | 2017-12-01 | 2017-12-01 | A kind of positive/negative-pressure of Landfill precipitation strengthens pump drainage shaft structure and construction method |
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| CN108060677A true CN108060677A (en) | 2018-05-22 |
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| CN201711250830.XA Pending CN108060677A (en) | 2017-12-01 | 2017-12-01 | A kind of positive/negative-pressure of Landfill precipitation strengthens pump drainage shaft structure and construction method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109025912A (en) * | 2018-09-13 | 2018-12-18 | 河南工程学院 | Coal bed gas water drainage gas production device |
| CN110219313A (en) * | 2019-06-05 | 2019-09-10 | 中国五冶集团有限公司 | A kind of underground construction blind shaft drainage system and construction method |
| CN110439015A (en) * | 2019-08-20 | 2019-11-12 | 中化明达(福建)地质勘测有限公司 | A kind of precipitation well construction with borehole cleaning function |
| CN111014225A (en) * | 2019-12-04 | 2020-04-17 | 中科鼎实环境工程有限公司 | Be used for aerobic bioreactor technology gas well device of taking out notes |
| CN111827324A (en) * | 2020-07-20 | 2020-10-27 | 浙江国丰集团有限公司 | Construction method of deep-layer dewatering pumping shaft of refuse landfill |
| CN113118172A (en) * | 2019-12-31 | 2021-07-16 | 上海浦东建筑设计研究院有限公司 | Percolate collecting well of domestic garbage landfill and installation method thereof |
| CN114134918A (en) * | 2021-11-10 | 2022-03-04 | 上海建工四建集团有限公司 | Use method of full-automatic control type vacuum deep well device |
| CN114602923A (en) * | 2021-09-10 | 2022-06-10 | 浙江大学 | Sectional type horizontal pumping and injecting system and method for accelerating degradation and stabilization of refuse landfill |
| CN114809123A (en) * | 2022-04-02 | 2022-07-29 | 中能建路桥工程有限公司 | Multi-stage support foundation pit monitoring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736804A (en) * | 2009-12-22 | 2010-06-16 | 浙江大学 | Refuse landfill percolate pump drainage minor-caliber shaft structure and silt prevention method |
-
2017
- 2017-12-01 CN CN201711250830.XA patent/CN108060677A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736804A (en) * | 2009-12-22 | 2010-06-16 | 浙江大学 | Refuse landfill percolate pump drainage minor-caliber shaft structure and silt prevention method |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109025912A (en) * | 2018-09-13 | 2018-12-18 | 河南工程学院 | Coal bed gas water drainage gas production device |
| CN109025912B (en) * | 2018-09-13 | 2020-10-09 | 河南工程学院 | Coal bed gas drainage and gas production device |
| CN110219313A (en) * | 2019-06-05 | 2019-09-10 | 中国五冶集团有限公司 | A kind of underground construction blind shaft drainage system and construction method |
| CN110219313B (en) * | 2019-06-05 | 2024-01-30 | 中国五冶集团有限公司 | Drainage system and construction method for underground construction blind well |
| CN110439015B (en) * | 2019-08-20 | 2021-01-12 | 中化明达(福建)地质勘测有限公司 | Precipitation well structure with clear hole function |
| CN110439015A (en) * | 2019-08-20 | 2019-11-12 | 中化明达(福建)地质勘测有限公司 | A kind of precipitation well construction with borehole cleaning function |
| CN111014225A (en) * | 2019-12-04 | 2020-04-17 | 中科鼎实环境工程有限公司 | Be used for aerobic bioreactor technology gas well device of taking out notes |
| CN113118172A (en) * | 2019-12-31 | 2021-07-16 | 上海浦东建筑设计研究院有限公司 | Percolate collecting well of domestic garbage landfill and installation method thereof |
| CN111827324B (en) * | 2020-07-20 | 2021-02-26 | 浙江国丰集团有限公司 | Construction method of deep-layer dewatering pumping shaft of refuse landfill |
| CN111827324A (en) * | 2020-07-20 | 2020-10-27 | 浙江国丰集团有限公司 | Construction method of deep-layer dewatering pumping shaft of refuse landfill |
| CN114602923A (en) * | 2021-09-10 | 2022-06-10 | 浙江大学 | Sectional type horizontal pumping and injecting system and method for accelerating degradation and stabilization of refuse landfill |
| CN114134918A (en) * | 2021-11-10 | 2022-03-04 | 上海建工四建集团有限公司 | Use method of full-automatic control type vacuum deep well device |
| CN114134918B (en) * | 2021-11-10 | 2023-08-08 | 上海建工四建集团有限公司 | Use method of full-automatic control type vacuum deep well device |
| CN114809123A (en) * | 2022-04-02 | 2022-07-29 | 中能建路桥工程有限公司 | Multi-stage support foundation pit monitoring method |
| CN114809123B (en) * | 2022-04-02 | 2024-05-24 | 中能建路桥工程有限公司 | Multistage support foundation pit monitoring method |
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Application publication date: 20180522 |