CN108330997A - A kind of horizontal well construction and construction method of Landfill precipitation - Google Patents
A kind of horizontal well construction and construction method of Landfill precipitation Download PDFInfo
- Publication number
- CN108330997A CN108330997A CN201810012131.XA CN201810012131A CN108330997A CN 108330997 A CN108330997 A CN 108330997A CN 201810012131 A CN201810012131 A CN 201810012131A CN 108330997 A CN108330997 A CN 108330997A
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- China
- Prior art keywords
- casing
- well
- well casing
- construction
- trepanning
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
- E02D2250/0076—Drilling
Abstract
The invention discloses a kind of horizontal well construction of Landfill precipitation and construction methods.Well casing leading portion is the coating steel pipe of not trepanning, as negative pressure ventilation seal section；Stage casing is the coating steel pipe of upper semi-circle trepanning, lower half circle not trepanning, and upper semi-circle enters stream interface as percolate, and lower half circle is as percolate flow channel；Back segment is the coating steel pipe of not trepanning, and end is blocked using plug；Well casing has 3% 15% angle that raises up.Horizontal well construction uses guide rod to be crept into forward by the specified angle that raises up first, and casing uses to synchronize with pipe direct circulation drilling process forms wellbore with proceeding to design length, it is ensured that installation well casing space；Then it withdraws guide rod and well casing is stretched into casing section by section, finally withdrawing casing makes to realize draining in well casing implantation heap body.Horizontal well construction is completed to be drained by the way of gravity flow, if silting, which occurs, for follow-up longtime running can be used high pressure backwashing technology dredging.
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
Horizontal well construction and construction method.
Background technology
The existing municipal solid waste sanitary landfill in China, rubbish day amount of landfill and diafiltration output of fluid it is big, percolate is long
Phase guide is unsmooth, can not effectively guide percolate siltation it is internal in landfill, cause the universal harmony of junk-heap body leachate level high.
When percolate from garbage filling field water level is excessively high, part percolate is laterally oozed along the generation of junk-heap body side cladding layers weakness
Leakage, seriously pollutes surrounding enviroment, while causing various forms of landfill body slope instabilities.Excessively high leachate level can also inhibit
The generation of methane gas and Collection utilization are easy to form hyperbar band inside, cause security risk.
To ensure the safe operation of refuse landfill, leachate level need to be controlled under warning line.For guide
Layer gradually fails or the landfill yard without guide system, mostly set vertical shaft in junk-heap body in the past and carries out precipitation.However pump drainage is perpendicular
Well is commonly present the problems such as construction depth is inadequate, pump drainage efficiency is too low and operation and maintenance cost is excessively high, and single using vertical shaft precipitation
It is difficult to meet heap body water level control requirement.
Invention content
In order to overcome the problems, such as that single pump drainage vertical shaft is difficult to meet heap body water level control requirement, the present invention provides a kind of rubbish
The structure and construction method of the novel dewatering measure-horizontal well of landfill yard, horizontal well as a kind of artesian well have management it is convenient,
Being used in conjunction with for the advantages that flow section area is big and work efficiency is high, horizontal well and vertical shaft can realize three-dimensional guide, can be more preferable
Meet heap body water level control requirement.
To achieve the above object, the technical solution adopted in the present invention is as follows：A kind of water of Landfill precipitation
Horizontal well structure, well casing leading portion is the coating steel pipe of not trepanning, as negative pressure ventilation seal section；Stage casing is upper semi-circle trepanning, lower half
The coating steel pipe of circle not trepanning, upper semi-circle enter stream interface as percolate, and lower half circle is as percolate flow channel；Back segment is not open
The coating steel pipe in hole, end are blocked using plug, prevent rubbish from entering well casing；Well casing outer wall wraps up one layer of filtration material；Well casing
The angle that raises up with 3%-15%；After valve is installed in well casing front end, guide branch pipe is accessed.
Further, it to ensure that every well casing upper semi-circle is in top, is all made of and is bolted between each section well casing.
Further, the well casing outer diameter 100-150mm, wall thickness 5-10mm, upper semi-circle open pore size 8-15mm.
Further, the length of the seal section is no less than 10m, ensures the feasibility that follow-up negative pressure ventilation is safeguarded.
Further, the filtration material, which is the filtering of the nylon wire or aperture 0.3-1mm of aperture 1-2mm, spinning geotechnique
Cloth.
A kind of construction method of the horizontal well construction of Landfill precipitation, it is characterised in that：
(1) guide rod is used to be crept into forward by the specified angle that raises up, casing synchronizes follow-up, guide rod and casing drilling
Wellbore is formed to design length；
(2) guide rod is withdrawn after wellbore is formed, and is taken back drilling cuttings while withdrawing marginal not and entering flushing liquor, is ensured in casing without miscellaneous
Object；
(3) guide rod is all withdrawn out cleaned out in casing and casing after, the well casing of filtration material will be wrapped up section by section
It stretches into casing；
(4) after well casing all stretches into casing, withdrawing casing makes well casing implantation junk-heap body realize draining.
Further, in the step (1), the advanced 1-3m of guide rod controls boring direction；Described sleeve pipe is used with pipe
Direct circulation drilling process follows up, it is ensured that installation well casing space.
Further, in the step (1), a diameter of 50-80mm of guide rod, casing is not trepanning seamless steel pipe,
A diameter of 170-200mm；Guide rod and casing front end all have enlarged diameter type cut drill.
Further, in the step (2), flushing liquor is the mixing of clear water and saponification agent or high molecular polymer drag reducer
Liquid.
Further, it in the step (4), needs piece mandril of tripping in withstand well casing before withdrawing casing, prevents well casing
It synchronizes and takes out of, then steel wire rope is connected on casing, extract casing section by section.
The invention has the advantages that：
1) it is proved by live long-term practice, construction method using the present invention can successfully set water in refuse landfill
Horizontal well；
2) it is drawn water and is compared using immersible pump with pump drainage vertical shaft, horizontal well is drained by way of gravity flow, without special
Arrangement personnel carry out operation and maintenance, save operating cost；
3) it is compared with pump drainage vertical shaft construction depth 30m or so, it is longer that horizontal well sets length, can reach 100m；If need to reach
Same water level control effect, the quantity that need to be set using horizontal well is few, management easy to produce；
4) mesh portion of horizontal well can be entirely located in water level line hereinafter, flow section area is larger, and drain discharge is big, together
When can preferably reduce leachate level above horizontal well；
5) horizontal well front end not trepanning section has preferable air-tightness, it is ensured that the feasibility of follow-up negative pressure pump drainage, it can be further
It improves the standard well working performance；
6) well casing can play the role of good corrosion-resistant and resistance to deformation using coating steel pipe.
Description of the drawings
Fig. 1 is guide rod and casing drilling schematic diagram in the present invention；
Fig. 2 is that guide rod and borehole cleaning schematic diagram are withdrawn in the present invention；
Fig. 3 is to stretch into well casing schematic diagram in the present invention after borehole cleaning；
Fig. 4 is to withdraw casing in the present invention and be implanted into well casing schematic diagram；
In figure：1, horizontally-guided drilling machine, 2, fixed earth anchor, 3, casing, 4, guide rod, 5, pipe bit, 6, orientation drill
Rod bit, 7, drilling cuttings, 8, junk-heap body, 9, well casing.
Specific implementation mode
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Horizontal well the well casing 9 a diameter of 133mm, wall thickness 6mm of the present invention；Leading portion is the coating steel pipe of not trepanning, as negative
Press air extracting seal section, length 12m；Stage casing is the coating steel pipe of upper semi-circle trepanning, lower half circle not trepanning, and wherein upper semi-circle is opened
Hole, open pore size 12mm, percent opening 6% enter stream interface as percolate, and lower half circle not trepanning is long as percolate flow channel
Degree is 42m；Back segment is the coating steel pipe of not trepanning, and end is blocked using plug, prevents rubbish from entering well casing, length 3m；Well
Pipe joint length is 3m, to ensure that every well casing upper semi-circle is in top, is all made of and is bolted between each section well casing；Well casing
Outer wall wraps up the nylon wire of one layer of aperture 1-2mm, as loaded filter；To ensure that diafiltration liquid energy voluntarily flows out, well casing 9 has 5%
The angle that raises up.
Horizontal well construction is crept into forward using guide rod 4 by the specified angle that raises up, and casing 3 synchronizes follow-up, guide rod 4
And the drilling of casing 3 to design length forms wellbore；Wellbore withdraws guide rod 4 after being formed, taken back while withdrawing marginal not and entering flushing liquor
Drilling cuttings 7 ensures no-sundries in casing 3；Guide rod 4 is all withdrawn out cleaned out in casing 3 and casing 3 after, will package it is anti-
The well casing 9 of filter material material is stretched into section by section in casing 3；After well casing 9 all stretches into casing 3, withdrawing casing 3 makes well casing 9 be implanted into rubbish heap
Body 8 realizes draining；Specific construction process is as follows：
(1) drilling machine is installed：Horizontally-guided drilling machine 1 is placed in the concrete foundation of thick 500mm, it is solid by fixed earth anchor 2
Determine rig substructure；After adjusting horizontal hole site and drilling extending direction, using being welded to connect rig substructure；
(2) horizontal well positions：According to horizontal well design floor plan, Horizontal Well is discharged with reference to well casing center line control point
Position and determine drilling extending direction, under normal circumstances well location deviation≤30mm；
(3) horizontal well pore-forming：After the completion of positioning, if Fig. 1 shows, first use guide rod 4 synchronous by specified angle with casing 3
Drilling to design length forms wellbore, and pipe bit 5 and guide rod drill bit 6 are all made of enlarged diameter type cut drill.Drilling process
In need to inject flushing liquor to play cooling drill bit and lubrication drag reduction, flushing liquor be preferably that clear water subtracts with saponification agent or high molecular polymer
The mixed liquor of resist.Then, guide rod 4 is withdrawn as Fig. 2 shows, takes back drilling cuttings 7 while withdrawing marginal not and entering flushing liquor, ensures casing 3
Interior no-sundries；
(4) well casing is stretched into：If Fig. 3 shows, after being cleaned out in casing 3, the well casing 9 for wrapping up filtration material is slowly advanced into
In casing 3.9 interface position of well casing to connect it is smooth securely, avoid scratch casing, 9 outlet section of well casing that valve to be installed；
(5) casing is withdrawn：If Fig. 4 shows, after well casing 9 all stretches into casing 3, start to withdraw casing 3；It is needed before withdrawing casing 3
Piece mandril of tripping in withstands well casing 9, prevents from synchronizing well casing 9 and take out of；Then using steel wire rope be connected on casing 3 recession by
Section extraction casing 3；After casing 3 is extracted completely, well casing 9 has been implanted into junk-heap body 8, and so far horizontal well construction is completed.
After the completion of horizontal well construction, connect after corresponding discharge pipe line can self-draining, if follow-up longtime running occurs
High pressure backwashing technology dredging can be used in silting.
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, equivalence replacement for being made etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of horizontal well construction of Landfill precipitation, it is characterised in that：Well casing leading portion is the galvanized steel of not trepanning
Pipe, as negative pressure ventilation seal section；Stage casing is the coating steel pipe of upper semi-circle trepanning, lower half circle not trepanning, and upper semi-circle is as diafiltration
Liquid enters stream interface, and lower half circle is as percolate flow channel；Back segment is the coating steel pipe of not trepanning, and end is blocked using plug, is prevented
Only rubbish enters well casing；Well casing outer wall wraps up one layer of filtration material；Well casing has the angle that raises up of 3%-15%；Pacify well casing front end
After filling valve, guide branch pipe is accessed.
2. the horizontal well construction of Landfill precipitation according to claim 1, it is characterised in that：To ensure every
Well casing upper semi-circle is in top, is all made of and is bolted between each section well casing.
3. the horizontal well construction of Landfill precipitation according to claim 1, it is characterised in that：Outside the well casing
Diameter 100-150mm, wall thickness 5-10mm, upper semi-circle open pore size 8-15mm.
4. the horizontal well construction of Landfill precipitation according to claim 1, it is characterised in that：The seal section
Length be no less than 10m, ensure the feasibility that follow-up negative pressure ventilation is safeguarded.
5. the horizontal well construction of Landfill precipitation according to claim 1, it is characterised in that：The anti-filter material
Material is the nylon wire of aperture 1-2mm or the filtering Woven geofabric of aperture 0.3-1mm.
6. a kind of construction method of the horizontal well construction of Landfill precipitation, it is characterised in that：Include the following steps：
(1) guide rod is used to be crept into forward by the specified angle that raises up, casing synchronizes follow-up, guide rod and casing drilling to setting
It counts length and forms wellbore；
(2) guide rod is withdrawn after wellbore is formed, and is taken back drilling cuttings while withdrawing marginal not and entering flushing liquor, is ensured no-sundries in casing；
(3) guide rod is all withdrawn out cleaned out in casing and casing after, the well casing for wrapping up filtration material is stretched into section by section
In casing；
(4) after well casing all stretches into casing, withdrawing casing makes well casing implantation junk-heap body realize draining.
7. construction method according to claim 6, it is characterised in that：In the step (1), the advanced 1-3m of guide rod,
Control boring direction；Described sleeve pipe is used to follow up with pipe direct circulation drilling process, it is ensured that installation well casing space.
8. construction method according to claim 6, it is characterised in that：In the step (1), guide rod it is a diameter of
50-80mm, casing are not trepanning seamless steel pipe, a diameter of 170-200mm；Guide rod and casing front end all have enlarged diameter type and cut
Cut drill bit.
9. construction method according to claim 6, it is characterised in that：In the step (2), flushing liquor is clear water and saponification
The mixed liquor of agent or high molecular polymer drag reducer.
10. construction method according to claim 6, it is characterised in that：In the step (4), tripping in is needed before withdrawing casing
A piece mandril withstands well casing, prevents from synchronizing well casing and take out of, then steel wire rope is connected on casing, extracts casing section by section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810012131.XA CN108330997A (en) | 2018-01-05 | 2018-01-05 | A kind of horizontal well construction and construction method of Landfill precipitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810012131.XA CN108330997A (en) | 2018-01-05 | 2018-01-05 | A kind of horizontal well construction and construction method of Landfill precipitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108330997A true CN108330997A (en) | 2018-07-27 |
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ID=62924760
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810012131.XA Pending CN108330997A (en) | 2018-01-05 | 2018-01-05 | A kind of horizontal well construction and construction method of Landfill precipitation |
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| Country | Link |
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| CN (1) | CN108330997A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113546953A (en) * | 2021-08-05 | 2021-10-26 | 山东中海新科环境技术有限公司 | Process for repairing sewage and soil of refuse landfill |
| CN115288609A (en) * | 2022-07-28 | 2022-11-04 | 河南盛邦环境工程有限公司 | Construction method of landfill body horizontal well and perforated pipe connecting device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106436776A (en) * | 2016-09-18 | 2017-02-22 | 上海胜义环境科技有限公司 | Method for applying horizontal directional drilling to refuse landfill leachate drainage |
-
2018
- 2018-01-05 CN CN201810012131.XA patent/CN108330997A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106436776A (en) * | 2016-09-18 | 2017-02-22 | 上海胜义环境科技有限公司 | Method for applying horizontal directional drilling to refuse landfill leachate drainage |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113546953A (en) * | 2021-08-05 | 2021-10-26 | 山东中海新科环境技术有限公司 | Process for repairing sewage and soil of refuse landfill |
| CN115288609A (en) * | 2022-07-28 | 2022-11-04 | 河南盛邦环境工程有限公司 | Construction method of landfill body horizontal well and perforated pipe connecting device |
| CN115288609B (en) * | 2022-07-28 | 2023-11-14 | 河南盛邦环境工程有限公司 | Construction method for horizontal well of landfill pile body and perforated pipe connecting device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180727 |
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| RJ01 | Rejection of invention patent application after publication |