CN105134129B - Based on radially strength expansion gas pumping method for sealing - Google Patents
Based on radially strength expansion gas pumping method for sealing Download PDFInfo
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- CN105134129B CN105134129B CN201510630482.3A CN201510630482A CN105134129B CN 105134129 B CN105134129 B CN 105134129B CN 201510630482 A CN201510630482 A CN 201510630482A CN 105134129 B CN105134129 B CN 105134129B
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Abstract
Based on radially strength expansion gas pumping method for sealing, comprise the following steps:（1）, determine sealing of hole position and hole sealing depth；（2）, determine have itself compactness is good, intensity is high, the sealing material of four features of high-expansion and strong permeability；（3）, install radially strength expansion extraction hole sealing device；（4）, will radially strength expansion extraction hole sealing device be inserted into drilling in expansion sealing of hole；（5）, treat polyurethane mixed liquor bag expansion finish, orifice tube is connected with gas pumping pipe, progress gas pumping.Apparatus structure that the present invention is used is simple, and sealing of hole speed is fast, easy to operate, can make workman's quickly skilled.The present invention improves effective sealed borehole length of extraction borehole well, and due to the compactness of sealing material, is fully able to undertake drilling and the pressure differential in extraneous tunnel, prevents that air is entered in drilling by sealing material itself crack that may be present in tunnel.
Description
Technical field
Taken out the present invention relates to a kind of coal bed gas extraction technical field, more particularly to a kind of radially strength expansion gas that is based on
Adopt method for sealing.
Background technology
Mine gas is one of principal element of serious threat Safety of Coal Mine Production.Gas explosion and Gas Outburst are current
The disaster in colliery most, cause every year many casualties and huge property loss.Therefore, prevention Gas Disaster is to drop
Low coal mining accident, coal industry healthy and sustainable development of guaranteeing the quality, it is significant.
Gas pumping is reduction mine gas emission rate, prevents gas explosion accident and preventing and treating coal and gas prominent disaster
Important measures.In addition, gas is the eco-friendly power source of high-quality, the gas of extraction can as fuel, for civilian and generate electricity, while
It is important industrial chemicals.Therefore gas pumping has great importance.
At present, the sealing of hole mode of China's mine gas extraction mainly has cement mortar sealing of hole and polyurethane sealing of hole.Cement bonded sand
Though the cost for starching sealing of hole is low, the cycle of cement mortar sealing of hole is longer, and sealing of hole speed is extremely slow.Change can be shunk after theing cement solidifies
Shape, can form crack between hole wall and extraction hole.And to fill up effect for the crack of rib bad for cement mortar, it is difficult to refill
Crack.Under negative pressure extraction, substantial amounts of air is caused to enter extraction pipeline.Sealing of hole effect is bad.Polyurethane sealing of hole, it has very
Good bonding force, expansion rate is fast, and coefficient of foaming is high, and its setting rate is fast, becomes hard material after expansion.Polyurethane
It is moistureproof after solidification, it is ageing-resistant.Current polyurethane sealing of hole is widely used on gas pumping.
Above-mentioned traditional method for sealing also has following defect:First, without network analysis and prediction roadway's sides with boring
Hole hole wall coal and rock fractured situation, scientifically determines sealed borehole length and hole sealing depth, but rule of thumb or relevant regulations
Determine sealed borehole length and hole sealing depth.Limited by hole-sealing technology, easily occur two extremely：By sealing material in aperture, envelope
Hole depth is shallow, has blocked coal body than relatively soft bore portions, it is impossible to ensure effective sealed borehole length, has caused hole sealing depth shallow, pre-
Gas pumping concentration is low；, hole sealing depth and sealed borehole length be excessive, causes sealing material to waste, and sealing of hole cost is improved, sealing of hole speed
Degree is slow.Secondly, the suitable standard of neither one judges the adaptability of sealing material nature, and most sealing materials are drilled
The influence of the factor such as the property of gas pressure, water-blocking effect, grouting pressure and material in itself, is difficult to penetrate into the fracture area of periphery
In the wall of a borehole crack, borehole circumference coal, rock mass still have air in various microfissures and hole, tunnel still can be by drilling
Surrounding cracked district is leaked with penetrating into extraction pipeline.Finally, traditional hole sealing technology, sealing material free wxpansion in drilling,
Do not constrained by borehole axial, without radial pressure, it is difficult to ensure the compactness of sealing material itself, cause sealing of hole not tight.
The content of the invention
There is provided a kind of simple in construction, easy to operate, hole sealing depth in order to solve weak point of the prior art by the present invention
Deep, sealing of hole effect is good based on radially strength expansion gas pumping method for sealing.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：Based on radially strength expansion gas pumping envelope
Hole method, comprises the following steps：
（1）, using RFPA-3D numerical simulation softwares, analysis roadway's sides and borehole wall surrounding coalmass crevasse situation, in advance
Survey roadway's sides plastically deforming area and drilling annular unloads the scope of trim ring, and then according to the crack situation and envelope of hole wall surrounding coal body
Hole length should be not less than roadway's sides cranny development scope, determine sealing of hole position and hole sealing depth；
（2）, according to borehole wall fractured situation and hole wall crack feature, and original gas drainage borehole sealing of hole skill
Influence mash gas extraction concentration and effect factor that art and technique are present, it is determined that with itself compactness is good, intensity is high, high-expansion
With the sealing material of strong four features of permeability；
（3）, install radially strength expansion extraction hole sealing device：Radially strength expansion extraction hole sealing device includes gas pumping
Pipe and gas pumping floral tube, gas pumping floral tube rear end are connected with gas pumping pipe front end, outside gas pumping pipe from front to back
Be sequentially provided be annular preceding fixed dam, preceding moving stop, rear moving stop and rear fixed dam, preceding fixed dam position
Provided with preceding rubber deformation cylinder between preceding fixed dam and preceding moving stop outside gas pumping pipe front end, gas pumping pipe
It is provided with outside body, gas pumping pipe between rear moving stop and rear fixed dam after rear rubber deformation cylinder, preceding moving stop
Surface is provided with preceding rubber blanket, and the rear preceding surface of moving stop is provided with outside rear rubber blanket, gas pumping pipe in preceding rubber blanket and rear rubber
Polyurethane mixed liquor bag is provided between rubber cushion；Outside the discoid structure of outer edge bending folded back upon of preceding rubber blanket, rear rubber blanket
Bending forms disk-like structure forward at edge；
（4）, by radially strength expansion extraction hole sealing device be inserted into drilling in, gas pumping floral tube is at drilling orifice
Stop after 6-8m；Polyurethane mixed liquor bag with bulging, caking property is located between preceding rubber blanket and rear rubber blanket, treats poly- ammonia
Ester expands, and axially promotes preceding moving stop and rear moving stop forwardly and rearwardly to be moved along gas pumping pipe respectively, in preceding fixation
Under the stop of baffle plate and rear fixed dam, preceding moving stop and rear moving stop promote preceding rubber deformation cylinder and rear rubber respectively
Deform cylinder and produce radial deformation, preceding rubber deformation cylinder and rear rubber deformation cylinder are radially expanded closure slip casting section two ends；It is poly-
Urethane mixed liquor continues to expand, due to the closure of preceding fixed dam and rear fixed dam, and polyurethane fills, penetrates into coalmass crevasse
In, one section of polyurethane filling coal body is formed, reaches that sealing extraction borehole and surrounding hole wall coal body disturb the purpose in crack；
（5）, treat polyurethane mixed liquor bag expansion finish, orifice tube is connected with gas pumping pipe, progress gas pumping.
Step（3）In preceding fixed dam and rear fixed dam be respectively welded on gas pumping pipe, preceding moving stop and
Moving stop wears and is slidably connected on gas pumping pipe afterwards.
Step（3）Middle polyurethane mixed liquor bag is bundled on the gas pumping pipe between preceding rubber blanket and rear rubber blanket.
Using above-mentioned technical proposal, the present invention is designed according to following principle：First, analyze and predict tunnel both sides with
The hole wall coalmass crevasse situation for the surrounding that drills, hole wall coalmass crevasse development is the result of crustal stress superposition.During earth history
Repeated tectonic movements are passed through in phase, coal seam, produce a large amount of initial fissures.The stress of primary rock is divided again in coal seam during tunnelling
There is stress concentration phenomenon in cloth, roadway surrounding rock.When surrouding rock stress is less than coal mass strength, coal seam is not destroyed and in elasticity
State；When surrouding rock stress is more than coal mass strength, roadway surrounding rock can produce plastic deformation, expand from tunnel-surrounding to country rock depths
, there is plastically deforming area to certain limit in exhibition.Secondly, sealing of hole main purpose is in the space for making extraction pipeline be formed with the wall of a borehole
Effective filling and sealing function can be played, and can be penetrated into the crack of drilling rib, tight closure effect is preferably played
Really, and according to hole wall coalmass crevasse feature, it can show that sealing material needs to meet several main nature and characteristics：1st, compactness
Good, material internal structure is tight, without Micro porosity and crack.2nd, intensity is high, be difficult when material is by larger stress by
Compression produces crack.3rd, high-expansion, can expand to high power, can be full of drilling under axial constraint, and produce radially pressure
Power.4th, strong permeability, easily against gas pressure in Fractured zone around drilling, the barrier effect of water-blocking effect in coal body, to
Drilling surrounding is gradually permeated in crack, realizes that closure crack effect is maximized.Finally, with the sealing of hole skill of radially strength expansion
Art, axial constraint device is devised at sealing material two ends, sealing material axial expansion is obstructed, and produces very big radial direction pressure
Power, makes sealing material occur strength and is radially expanded, be fully infiltrated into hole wall coalmass crevasse, reach good sealing of hole effect.
Preceding rubber deformation cylinder and rear rubber deformation cylinder in the present invention are soft rubber, are squeezed and are easily deformed.
Preceding moving stop and rear moving stop can be moved by axial compressive force.Preceding moving stop, rear moving stop, preceding fixed dam and after
Fixed dam is annular, gas pumping pipe therefrom between pass.And preceding moving stop, rear moving stop, preceding fixed dam
It is slightly less than bore diameter with the diameter of rear fixed dam.Annular is respectively fixed with preceding moving stop and rear moving stop
The diameter of preceding rubber blanket and rear rubber blanket, preceding rubber blanket and rear rubber blanket flows out slightly larger than the diameter of drilling to prevent polyurethane.
The present invention carries out sealing of hole as sealing material using polyurethane to coal mine gas drainage device.Because polyurethane has
Expansion rate is fast, viscosity is big, and has good compactness after solidification.The present invention can be good at constraining the axial direction of polyurethane
Expansion.Because polyurethane expansion effect is fairly obvious, polyurethane is in preceding fixed dam and rear fixed dam by under closure, and itself is swollen
It is swollen to enter splitting, extend coalmass crevasse in hole wall, filling hole and coal body male and fomale(M＆F).Treat that polyurethane is sufficiently radially expanded
Combined closely after solidification with drilling surrounding medium, final thoroughly closure gas crack passage.Under negative pressure extraction, due to polyurethane
Compactness, can be very good closure drilling useful effect radius region in coal seam formed a large amount of micro-cracks, hole lead to
Road, and will not further be developed with extraction crack.
Compared with used method of pore sealing before, the present invention has advantages below：
1st, according to coal and rock porous dehiscence gap structure and mechanical property, strata behaviors rule, coal extraction gas technology and
Technique, with reference to RFPA-3D results of numerical simulation, analysis and prediction tunnel both sides and the hole wall coalmass crevasse feelings of drilling surrounding
Condition, determines that tunnel both sides plastically deforming area and drilling annular unload the scope of trim ring.According to the crack situation and sealing of hole of hole wall coal body
Length should be not less than hole wall cranny development scope, determine its sealed borehole length and hole sealing depth.Cross the serious of tunnel both sides development
Coal petrography plastically deforming area scope, only in borehole wall fissure zone sealing of hole, can improve the effect of sealing of hole can save sealing material again.
2nd, the main character feature that need to be met according to sealing material, can determine whether the sealing of hole effect of different sealing materials, helps
In selection more suitably sealing material, can preferably into and block hole wall coal, rock cranny, reach more preferable sealing of hole
Effect.
3rd, sealing material is constrained in drilling by borehole axial, produces radial pressure, sealing material is occurred strength radially
Expansion, can either ensure that sealing material is fully infiltrated into hole wall coal, in rock cranny, obtain good closure coal petrography crack effect,
The compactness of sealing material itself is can guarantee that again, reaches good sealing of hole effect.
In summary, preceding rubber deformation cylinder and rear rubber deformation the cylinder radial deformation after by axial force expand, energy
It is enough that the two ends that polyurethane fills coal body are blocked very well.Polyurethane is in preceding rubber deformation cylinder and rear rubber deformation cylinder
Axially under restriction, gas crack passage can be sufficiently filled.And ensure being radially expanded for polyurethane, thoroughly closure gas crack leads to
Road.The present invention can refill crack well.Under negative pressure extraction, the present invention will not be such that crack further sends out due to extraction
Educate.
Apparatus structure that the present invention is used is simple, and sealing of hole speed is fast, easy to operate, can make workman's quickly skilled.This hair
The bright effective sealed borehole length for improving extraction borehole well, and due to the compactness of sealing material, be fully able to undertake drilling
With the pressure differential in extraneous tunnel, prevent that air is entered in drilling by sealing material itself crack that may be present in tunnel.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 be in Fig. 1 A-A to sectional view；
Fig. 3 is that polyurethane of the present invention expands the schematic diagram after sealing of hole；
Fig. 4 is B-B direction sectional view in Fig. 3.
Embodiment
The present invention's expands gas pumping method for sealing based on radially strength, comprises the following steps：
（1）, this test site be selected in the northern wing auxiliary return airway of the level of three ore deposit of Hebi Coal Industry Group four.The region belong to coal with
Gas Outburst hazardous area, average coal thickness 6.8m, 23 °~26 ° of seam inclination；Drilling control seat earth absolute altitude is -580 and -620
Between m, ground elevation is+138.8m, buried depth 718.8m~758.8m.Vertical Permeability Coefficent in Coal Seam is 3.60~
7.15m2/MPa2 d, gas bearing capacity is 12~15m3/t.
First, the cranny development scope of live tunnel rib presence is analyzed to determine hole sealing depth, using RFPA-3D numerical value
Analogy method, according to live real data, analyzes the cranny development scope of tunnel rib.Model test piece is cuboid, and size is long
× wide × a height of 26 × 4 × 10m, cell 325 × 50 × 125, totally 2031250 cell.Poisson's ratio 0.27, average degree m=
2.5, compression strength takes 15MPa, modulus of elasticity=11000MPa, coal body density 1.41 × 10-5g/mm3.Model surrounding and bottom are adopted
With displacement constraint, displacement is 0（I.e. borderline unit is not moved）, top is free boundary, using uniform load plus
Carry, imposed load 10MPa simulation buried depths about 500m vertical crustal stress on vertical direction.It is initially complete country rock, stress equilibrium
Lower excavation tunnel（Meta is equipped with an arched tunnel run through, wide 2m, high 3m in a model）, after periphery release is stable, one
Extraction drilling is excavated in side, and release situation is calculated again.It can draw, due to the excavation and the drilling in extraction hole in tunnel, destruction
Stress will change in primary stress field, peripheral rock, and the change of minimum principal stress is particularly evident.Can from coloured picture
Going out tunnel surrounding has the scope of significant change general in 1-2m, and the excavation in extraction hole causes the lateral stress further to reduce, still
Country rock relief range does not expand significantly, hence it is evident that distressed zone is 2m or so.Meanwhile, in extraction hole, surrounding has obvious stress to drop
It is low, but coverage very little.Due to the excavation and the drilling in extraction hole in tunnel, significant change all occurs for 3 principal stresses, minimum
The change of principal stress is maximum.In the range of the 4-6m of tunnel, stress has significant change；With the increase of distance, country rock
Stress gradually reverts to primitive stress.Excavate the coverage disturbed to surrouding rock stress maximum up to 8-10m.In stress envelope
Region beyond 8m, surrouding rock stress value and primitive stress value are substantially overlapping.Effective release model of the roadway excavation for surrouding rock stress
Enclose for 4-6m, release effect is the most notable in 2m, change the most it is apparent that minimum principal stress value（Near tunnel
Position）.Found from above figure, roadway excavation has control action for relief range, the size of relief range is determined substantially,
And the excavation in extraction hole can further reduce the stress in country rock, play a part of an overall range of decrease for stress, for unloading
The increase of scope is pressed without obvious effect.The above analysis, the size of relief range is main by roadway excavation process control, extraction
The influence that the excavation in hole changes for relief range is little, but the entire lowering of stress can be caused in the range of extraction hole,
Tunnel rib relief range is general in 4-6m, and stress disturbance scope is up to 8m or so.It is possible thereby to determine that sealed borehole length should not be low
In 8m hole wall cranny development scope；
（2）, according to borehole wall fractured situation and hole wall crack feature, and original gas drainage borehole sealing of hole skill
Influence mash gas extraction concentration and effect factor that art and technique are present, it is determined that with itself compactness is good, intensity is high, high-expansion
With the sealing material of strong four features of permeability；
（3）, install radially strength expansion extraction hole sealing device：As Figure 1-Figure 4, radially strength expansion extraction sealing of hole is filled
Put including gas pumping pipe 1 and gas pumping floral tube 2, the rear end of gas pumping floral tube 2 is connected with the front end of gas pumping pipe 1, gas
Be sequentially provided with from front to back outside drainage tube 1 be annular preceding fixed dam 3, preceding moving stop 4, the and of rear moving stop 5
Fixed dam 6 afterwards, preceding fixed dam 3 is located at outside the front end of gas pumping pipe 1, gas pumping pipe 1 in preceding fixed dam 3 and reach
It is provided between dynamic baffle plate 4 outside preceding rubber deformation cylinder 7, gas pumping pipe 1 between rear moving stop 5 and rear fixed dam 6
Provided with rear rubber deformation cylinder 8, surface is provided with preceding rubber blanket 9 after preceding moving stop 4, and the preceding surface of rear moving stop 5 is provided with rear rubber
Polyurethane mixed liquor bag 11 is provided with outside rubber cushion 10, gas pumping pipe 1 between preceding rubber blanket 9 and rear rubber blanket 10；Preceding rubber
Pad 9, the discoid structure of outer edge bending folded back upon of preceding rubber blanket 9, bending forms plate-like to the outer edge of rear rubber blanket 10 forward
Structure；
（4）, by radially strength expansion extraction hole sealing device be inserted into drilling in, gas pumping floral tube 2 is apart from drilling orifice
Locate to stop after 6-8m；Polyurethane mixed liquor bag 11 with bulging, caking property be located at preceding rubber blanket 9 and rear rubber blanket 10 it
Between, treat that polyurethane expands, axially promote preceding moving stop 4 and rear moving stop 5 forwardly and rearwardly to be moved along gas pumping pipe 1 respectively
Dynamic, under the stop of preceding fixed dam 3 and rear fixed dam 6, preceding moving stop 4 and rear moving stop 5 promote preceding rubber respectively
Deform cylinder 7 and rear rubber deformation cylinder 8 produces radial deformation, preceding rubber deformation cylinder 7 and rear rubber deformation cylinder 8 are radially swollen
Swollen closure slip casting section two ends；Polyurethane mixed liquor continues to expand, due to the closure of preceding fixed dam 3 and rear fixed dam 6, poly- ammonia
Ester is filled, penetrated into coalmass crevasse, is formed one section of polyurethane filling coal body, is reached sealing extraction borehole and surrounding hole wall coal body
Disturb the purpose in crack；
（5）, treat polyurethane mixed liquor bag 11 expansion finish, orifice tube is connected with gas pumping pipe 1, progress gas take out
Adopt.
Step（3）In preceding fixed dam 3 and rear fixed dam 6 be respectively welded on gas pumping pipe 1, preceding moving stop
4 and rear moving stop 5 wear and be slidably connected on gas pumping pipe 1.
Step（3）Middle polyurethane mixed liquor bag 11 is bundled in the gas pumping pipe 1 between preceding rubber blanket 9 and rear rubber blanket 10
On.
Preceding rubber deformation cylinder 7 and rear rubber deformation cylinder 8 are soft rubber, are squeezed and are easily deformed.Preceding mobile gear
Plate 4 and rear moving stop 5 can be moved by axial compressive force.Preceding moving stop 4, rear moving stop 5, preceding fixed dam 3 and rear solid
It is annular to determine baffle plate 6, gas pumping pipe 1 therefrom between pass.And preceding moving stop 4, rear moving stop 5, preceding fixed gear
The diameter of plate 3 and rear fixed dam 6 is slightly less than bore diameter.Circle is respectively fixed with preceding moving stop 4 and rear moving stop 5
The preceding rubber blanket 9 and rear rubber blanket 10 of annular, diameter of the diameter slightly larger than drilling of preceding rubber blanket 9 and rear rubber blanket 10, to prevent
Polyurethane flows out.
The present invention carries out sealing of hole as sealing material using polyurethane to coal mine gas drainage device.Because polyurethane has
Expansion rate is fast, viscosity is big, and has good compactness after solidification.The present invention can be good at constraining the axial direction of polyurethane
Expansion.Because polyurethane expansion effect is fairly obvious, polyurethane in preceding fixed dam 3 and rear fixed dam 6 by under closure, itself
Expansion can enter splitting, extend coalmass crevasse in hole wall, filling hole and coal body male and fomale(M＆F).Treat that polyurethane is sufficiently radially swollen
Combined closely after swollen solidification with drilling surrounding medium, final thoroughly closure gas crack passage.Under negative pressure extraction, due to poly- ammonia
The compactness of ester, can be very good coal seam of the closure in drilling useful effect radius region and forms a large amount of micro-cracks, hole
Passage, and will not further be developed with extraction crack.
The sealing of hole course of work of the present invention is as follows：Step（1）：By appropriate polyurethane mixed liquor bag 11, preceding rubber is bundled in
Glue is deformed on the gas pumping pipe 1 between cylinder 7 and rear rubber deformation cylinder 8.Step（2）：The present invention is put into from the front to the back
In the drilling 14 of issured coall 13, about go deep into after 6~8m stopping.Step（3）：Treat that the expansion of polyurethane mixed liquor bag 11 is finished,
Orifice tube is connected with gas pumping pipe 1, gas pumping is carried out.
The present embodiment not makees any formal limitation to shape, material, structure of the present invention etc., every according to this hair
Any simple modification, equivalent variations and modification that bright technical spirit is made to above example, belong to the technology of the present invention side
The protection domain of case.
Claims (3)
1. based on radially strength expansion gas pumping method for sealing, this method is using radially strength expansion extraction hole sealing device, footpath
It is annular to include being sequentially provided with from front to back outside gas pumping pipe, gas pumping pipe to strength expansion extraction hole sealing device
Preceding fixed dam, preceding moving stop, rear moving stop and rear fixed dam, preceding fixed dam be located at gas pumping pipe front end,
Preceding rubber deformation cylinder is provided with outside gas pumping pipe between preceding fixed dam and preceding moving stop, outside gas pumping pipe
Rear rubber deformation cylinder is provided between moving stop and rear fixed dam afterwards, it is characterised in that：Comprise the following steps：
（1）, using RFPA-3D numerical simulation softwares, analysis roadway's sides and borehole wall surrounding coalmass crevasse situation predict lane
Road Liang Bang plastically deforming areas and drilling annular unload the scope of trim ring, and then long according to the crack situation and sealing of hole of hole wall surrounding coal body
Degree should be not less than roadway's sides cranny development scope, determine sealing of hole position and hole sealing depth；
（2）, according to borehole wall fractured situation and hole wall crack feature, and original gas drainage borehole hole sealing technology and
Influence mash gas extraction concentration and effect factor that technique is present, it is determined that with itself compactness is good, intensity is high, high-expansion and strong
The sealing material of four features of permeability；
（3）, install radially strength expansion extraction hole sealing device：Radially strength expansion extraction hole sealing device also includes gas pumping flower
Pipe, gas pumping floral tube rear end is connected with gas pumping pipe front end, and surface is provided with preceding rubber blanket, rear mobile gear after preceding moving stop
The preceding surface of plate is provided with outside rear rubber blanket, gas pumping pipe is provided with polyurethane mixed liquor between preceding rubber blanket and rear rubber blanket
Bag；The discoid structure of outer edge bending folded back upon of preceding rubber blanket, bending forms disk-like structure to the outer edge of rear rubber blanket forward；
（4）, by radially strength expansion extraction hole sealing device be inserted into drilling in, gas pumping floral tube 6-8m at drilling orifice
After stop；Polyurethane mixed liquor bag with bulging, caking property is located between preceding rubber blanket and rear rubber blanket, treats that polyurethane is swollen
It is swollen, axially promote preceding moving stop and rear moving stop forwardly and rearwardly to be moved along gas pumping pipe respectively, in preceding fixed dam
Under stop with rear fixed dam, preceding moving stop and rear moving stop promote preceding rubber deformation cylinder and rear rubber deformation respectively
Cylinder produces radial deformation, and preceding rubber deformation cylinder and rear rubber deformation cylinder are radially expanded closure slip casting section two ends；Polyurethane
Mixed liquor continues to expand, due to the closure of preceding fixed dam and rear fixed dam, and polyurethane is filled, penetrated into coalmass crevasse,
One section of polyurethane filling coal body is formed, reaches that sealing extraction borehole and surrounding hole wall coal body disturb the purpose in crack；
（5）, treat polyurethane mixed liquor bag expansion finish, orifice tube is connected with gas pumping pipe, progress gas pumping.
2. it is according to claim 1 based on radially strength expansion gas pumping method for sealing, it is characterised in that：Step（3）
In preceding fixed dam and rear fixed dam be respectively welded on gas pumping pipe, preceding moving stop and rear moving stop are worn simultaneously
It is slidably connected on gas pumping pipe.
3. it is according to claim 1 based on radially strength expansion gas pumping method for sealing, it is characterised in that：Step（3）
Middle polyurethane mixed liquor bag is bundled on the gas pumping pipe between preceding rubber blanket and rear rubber blanket.
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| CN201510630482.3A CN105134129B (en) | 2015-05-29 | 2015-09-29 | Based on radially strength expansion gas pumping method for sealing |
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| CN108060903B (en) * | 2017-11-24 | 2019-01-08 | 山东科技大学 | Coal-bed gas pressure measures dynamic self-balance pressurization hole sealing device and method |
| CN108593174B (en) * | 2018-05-08 | 2024-01-02 | 安徽理工大学 | Coal rock mass mining stress monitoring inclusion |
| CN108468529A (en) * | 2018-05-23 | 2018-08-31 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of coal mine gas extraction drill hole pressure wind sealing method and device |
| CN110529173A (en) * | 2019-08-26 | 2019-12-03 | 河南工程学院 | A kind of straight plug integration gas drainage device and pumping method |
| CN111561291B (en) * | 2020-05-06 | 2022-04-08 | 太原理工大学 | Double-layer extrusion type hole sealing device and method for gas extraction drill hole |
| CN112196498B (en) * | 2020-09-28 | 2022-09-02 | 河南理工大学 | Cross-layer drilling separated type whole-course gas extraction hole sealing device |
| CN113719255B (en) * | 2021-09-17 | 2023-03-24 | 河南理工大学 | Gas extraction and hole sealing method for directional long-drilled-hole fractured zone at top |
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