CN202756010U - Methane drawing out device for deep hole fracture blasting control - Google Patents
Methane drawing out device for deep hole fracture blasting control Download PDFInfo
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- CN202756010U CN202756010U CN 201220467708 CN201220467708U CN202756010U CN 202756010 U CN202756010 U CN 202756010U CN 201220467708 CN201220467708 CN 201220467708 CN 201220467708 U CN201220467708 U CN 201220467708U CN 202756010 U CN202756010 U CN 202756010U
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Abstract
The utility model relate to a methane drawing out device for deep hole fracture blasting control. The methane drawing out device for the deep hole fracture blasting control is composed of a plurality of steel pipe units with the length of 2-3m. Screw threads used for connection are arranged at the two ends of each steel pipe unit, rectangular kerf through holes are respectively formed in the symmetrical positions on a pipe body of each steel pipe unit, the length of the rectangular kerf through holes is smaller than the length of the steel pipe units, the width of the rectangular kerf through holes is 6mm, round through holes with the diameter of 6mm are formed in the pipe walls around the rectangular kerf through holes, and the distance between each two round through holes is 1-1.3mm. The methane drawing out device for the deep hole fracture blasting control intensively controls the shape of blasting pressure pulses imposed on the wall of a drilling hole, and thus the number of generated cracks is controlled, and the purposes that extending distance of the cracks increases and the wall of a hole is not severely broken and then collapses are achieved. Meanwhile, action time is prolonged, and gas produced by blasting can easily enter into the cracks, and the cracks are driven to spread farther, the scope of the cracks is enlarged, the cracks facilitates let-out of methane, and can effectively increase the drawing out rate of the methane in the coal bed.
Description
Technical field
the utility model relates to the device drawn out methane of a kind of deep hole crack controlled blasting.
Background technology
Along with the increase of the coal mining degree of depth, the amount of Gas also increases thereupon, and highly gassy mine increases, particularly the gas permeability in coal seam is poor, the colliery that gas adsorption is strong, and the gas that is is extracted out and is difficult to carry out, strengthen every slabbing gap, improve gas permeability, and then strengthen the free property of gas in coal seam.And hydraulic pressure presplitting is to increase a kind of coal seam presplitting mode of attempting recent years, but its shortcoming is that the permeability due to water in coal body is very poor, easily produces the crossfire phenomenon, be unfavorable for the discharge of gas, larger on the impact of adjacent hole, can't produce a desired effect at all, and crack generation effect that can only be relatively large to minority, and the crack scope is little, in half meter, therefore, hydraulic pressure presplitting is little to the thorough improvement effect of gas permeability, unsatisfactory to the extraction that improves gas in coal seam.
Summary of the invention
In order to address the above problem, the purpose of this utility model is to provide a kind of simple in structure, easy to operate, can greatly strengthen the gas permeability in coal seam, and the crack scope, than large several times of hydraulic pressure presplitting, after explosion, has steel pipe in boring, and boring is not subsided, and is conducive to the discharge of gas.Improve the free situation of gas in coal seam
the device drawn out methane of deep hole crack controlled blasting.
the technical solution of the utility model is: the device drawn out methane of deep hole crack controlled blasting, this device bythe steel pipe unit that some segment length are 2-3m forms,
at every sectionthe two ends of steel pipe unit are equipped with the screw thread for connecting,
at every sectionon the body of steel pipe unit, symmetric position is offered respectively the rectangle joint-cutting through hole that length is less than the steel pipe element length, described rectangle joint-cutting through hole width is 6mm, offer the manhole that diameter is 6mm on the tube wall of described rectangle joint-cutting bore periphery, between manhole and manhole, distance is 1-1.3m.
The beneficial effects of the utility model are: by adopting technique scheme, the utility model is implemented centralized Control to the blast pressure pulse shape be applied on drill hole wall, thereby reach the generation number of controlling crackle, the purpose that increases the distance of crack growth and do not cause the serious fragmentation of hole wall, subside. extended action time simultaneously and made blast generate the easy injection of gas in crackle, drive the farther of crack propagation, enlarge the scope of fracturing, be conducive to the discharge of gas.Joint-cutting pipe charge explosion can produce crack by the predetermined direction in coal seam, and the number in crack is relevant with the physical and mechanical property of number, blasting parameter and the coal of joint-cutting with the degree of depth.These cracks can be improved the extraction rate of gas in coal seam effectively.
The accompanying drawing explanation
The structural representation that Fig. 1 is device monomer of the present utility model.
Fig. 2 is the structural representation in concrete enforcement of the present utility model.
In figure:
1. boring, 2. steel pipe unit, 3. screw thread, 4. rectangle joint-cutting through hole, 5. manhole, 6. explosive, 7.
detonating fuse, 8. detonator, 9. detonator lead-in wire, 10. stemming.
The specific embodiment
Below in conjunction with specific embodiment, the technical solution of the utility model is described further.
As shown in Figure 1, the utility model
this device of the device drawn out methane of deep hole crack controlled blasting, this device bythe steel pipe unit 2 that some segment length are 2-3m forms,
at every sectionthe two ends of steel pipe unit 2 are equipped with the screw thread 3 for connecting,
at every sectionon the body of steel pipe unit 2, symmetric position is offered respectively the rectangle joint-cutting through hole 4 that length is less than the steel pipe element length, described rectangle joint-cutting through hole 4 width are 6mm, the manhole 5 that to offer diameter on the tube wall of described rectangle joint-cutting through hole 4 peripheries be 6mm, the spacing between manhole 5 and manhole 5 is 1-1.3m.
Example one, certain ore deposit, work plane moves towards long 171 meters, tilts long 1253 meters, and working seam is single compound seam, 1.5 meters of coal seam average thickness, the Protodyakonov coefficient f=0.5-1.0 of coal, be high Coal Seam Prone To Outburst after measured, coal-bed gas pressure
coal seam gas-bearing capacity
permeability Coefficent in Coal Seam
belong to the gas drainage under suction mode in .Gai ore deposit, low-permeable hard-pumped coal seam for adopting advance borehole, beat the method that extraction is carried out in the concordant hole along coal seam at air way, the boring of coal-face machine air way concordant is arranged along coal seam, 80 1 100 meters of boring length, 5 meters of the spacings of wells, 115 millimeters, perforate aperture, aperture, whole hole 85-65 millimeter, by a segment length, being the steel pipe unit that 2m, diameter are less than described bore diameter, is 1.2 according to coupling coefficient not, and linear charging density is 1.07
dosage by explosive cartridge
pack in every section steel pipe, detonating fuse in colligation on explosive cartridge, repeat aforesaid operations, after the steel pipe unit total length that installs explosive, detonating fuse reaches the requirement of engineering design, the steel pipe unit is chained together one by one, and detonating fuse in connection, load onto using detonator as apparatus to cause bursting at the explosive cartridge of the steel pipe unit that approaches hell, and detonator is caused outside boring, good with the yellow mud shutoffboring
;
in b, ignition boring, explosive carries out the crack explosion, the boring radius that the length that the shock wave pressure that blast produces makes borehole circumference produce a large amount of ，Bao Sheng cracks, crack is greater than 15～100 times.
After tested, the gas of holes is on average 0.22 from discharge capacity
it is contrast 5 one 12 times of hole, at the extraction initial stage, shot hole than the drawing-off gas of adjacent bores apparently higher than the contrast hole away from burst region, after extraction after a while, shot hole increases apart from further with hundred meters, contrast hole boring difference in flow, but finally can progressively decay and approach.During gas hole explosion, the gas emission effect of adjacent holes is also very remarkable, even surpass the gas emission of shot hole at the cranny development section, adopt the controlled blasting technology can improve the gas drainage under suction effect, the controlled blasting method reduces the extraction time 1/2nd to 1/3rd.
Example two, the working seam in a colliery of Xingtai mineral bureau belongs to high gas layer, and its gas emission of producing coal per ton daily is greater than 10m
3, traditional drill mash gas method can not guarantee the extraction rate effectively.Carry out the crack explosion for this reason, improve the gas drainage efficiency ore deposit, big gun hole and other parameter are close with example one, from explosion Hou Bao district excavation result, the predetermined direction around hole wall has obvious crack to produce, and crack length is 800～1200mm, aperture, big gun hole slightly swells, due to the impact of geostatic stress, there is the part crack to occur closed, but still improved significantly gas drainage efficiency.According to Site Detection, blast cracking after gas drawing and deflating flux has improved more than 1 times, and the duration is longer.In addition, cause vibration during explosion in coal seam, make the gas of ADSORPTION STATE separate and become free state, also be conducive to gas drainage under suction.
For high fiery colliery, method commonly used is to carry out gas pre-drainage to put, the gas emission while reducing seam mining.The general drilling-draining method that adopts, i.e. directly boring in coal seam, make on hole wall and near gas is overflowed along boring.The effect of this method is unsatisfactory, is mainly because between Kong Yukong, coal-bed gas can't extraction.The common explosion technology that draws out methane is that the coal mine safety explosive of directly packing in the big gun hole carries out explosion.Compressibility due to coal, often form the explosion cavity enlarged after this method explosion in coal seam, on hole wall, be difficult to form darker crack, and after explosion, coal body is soft, the intensity of coal itself is very low, the big gun hole tends to by the coal dust compacting after explosion, and methane gas can't get out, and adopts this patent----joint-cutting steel pipe cartridge bag crack blasting method, produce more and sufficiently long crack around boring, just can increase substantially gas drainage efficiency.
Claims (1)
1.
the device drawn out methane of deep hole crack controlled blasting, is characterized in that, this device bythe steel pipe unit (2) that some segment length are 2-3m forms,
at every sectionthe two ends of steel pipe unit (2) are equipped with the screw thread (3) for connecting,
at every sectionon the body of steel pipe unit (2), symmetric position is offered respectively the rectangle joint-cutting through hole (4) that length is less than the steel pipe element length, the width of described rectangle joint-cutting through hole (4) is 6mm, offer the manhole (5) that diameter is 6mm on the tube wall of described rectangle joint-cutting through hole (4) periphery, between described manhole (5) and manhole (5), distance is 1-1.3m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220467708 CN202756010U (en) | 2012-09-13 | 2012-09-13 | Methane drawing out device for deep hole fracture blasting control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220467708 CN202756010U (en) | 2012-09-13 | 2012-09-13 | Methane drawing out device for deep hole fracture blasting control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202756010U true CN202756010U (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220467708 Expired - Fee Related CN202756010U (en) | 2012-09-13 | 2012-09-13 | Methane drawing out device for deep hole fracture blasting control |
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| Country | Link |
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| CN (1) | CN202756010U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817633A (en) * | 2012-09-13 | 2012-12-12 | 广东宏大爆破股份有限公司 | Device for draining gas by deep hole crack control blasting and precracking method |
-
2012
- 2012-09-13 CN CN 201220467708 patent/CN202756010U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817633A (en) * | 2012-09-13 | 2012-12-12 | 广东宏大爆破股份有限公司 | Device for draining gas by deep hole crack control blasting and precracking method |
| CN102817633B (en) * | 2012-09-13 | 2016-05-11 | 广东宏大爆破股份有限公司 | The device drawing out methane and the pre-splitting method of the controlled blasting of deep hole crack |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130227 Termination date: 20170913 |
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| CF01 | Termination of patent right due to non-payment of annual fee |