CN103334790B - Based on the roof Advance presplitting method of high pressure pneumatic component - Google Patents
Based on the roof Advance presplitting method of high pressure pneumatic component Download PDFInfo
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- CN103334790B CN103334790B CN201310309885.9A CN201310309885A CN103334790B CN 103334790 B CN103334790 B CN 103334790B CN 201310309885 A CN201310309885 A CN 201310309885A CN 103334790 B CN103334790 B CN 103334790B
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Abstract
Based on the roof Advance presplitting method of high pressure pneumatic component, belong to technical field of mine safety.Carry out according to the following steps: 1) perform one group of boring respectively to roof at a certain distance in work plane transport and track crossheading, and often organize boring in fan-shaped layout and towards goaf; 2) the gas explosion rifle be connected with gases at high pressure compressibility is placed in boring, adopts high-strength fast hardening concrete or resin glue sealing of hole; 3) start gases at high pressure compressibility, by the gases at high pressure in high pressure tank by the abrupt release explosion in boring of gas explosion rifle, the crack around boring is communicated with adjacent boring; 4) above-mentioned steps 2 is repeated successively to often organizing boring) and 3), complete the Advance presplitting of roof.The present invention not only eliminates the potential spark hazard of chemical explosive explosion, and because high-pressure gas pressure is controlled and can repeat to carry out concussion burst to rock mass, make the energetic disturbance in coal seam little, top board presplitting is effective, environmental protection, safety and reliable.
Description
Technical field
The present invention relates to technical field of mine safety, particularly relate to a kind of roof Advance presplitting method based on high pressure pneumatic component.
Background technology
For reducing goaf area of suspension roof, shorten first and periodic weighting step pitch, reduce first and periodic weighting intensity, China's roof mainly adopts the methods such as hydrofracturing method, circulating shallow blasting method, ground deep hole blasting method and advanced deep hole presplitting technique to weaken coal seam tight roof.Due to the geostatic stress sensitiveness of fracturing rock crack expansion, the potential spark hazard of chemical explosive explosion and peak value explosion wave, to the strong power disturbance in coal seam, make the effect of above-mentioned technical finesse coal seam tight roof undesirable.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of simple to operate, roof Advance presplitting method based on high pressure pneumatic component that presplitting is effective.
The present invention is based on the roof Advance presplitting method of high pressure pneumatic component, carry out according to following steps:
1) perform one group of boring respectively to roof at a certain distance in work plane transport and track crossheading, this distance can not be greater than first and periodic weighting step pitch, and often organizes boring in fan-shaped layout and towards goaf;
2) the gas explosion rifle be connected with gases at high pressure compressibility is placed in boring, adopts high-strength fast hardening concrete or resin glue sealing of hole;
3) start gases at high pressure compressibility, by the gases at high pressure in high pressure tank by the abrupt release explosion in boring of gas explosion rifle, can repeatedly circulate explosion, and the crack around boring is communicated with adjacent boring;
4) above-mentioned steps 2 is repeated successively to often organizing boring) and 3), complete the Advance presplitting of roof.
In step 1) in, each boring often in group boring is all with the different elevations angle
βand horizontal angle
αpierce roof, and make equal and along advance of the face direction the horizontal projection of the vertical projection of each boring also equal as far as possible.
In step 1) in, the minimum range of foot of hole and working face wall or tunnel sidewall is not less than 5m.
In step 1) in, the diameter of boring is 60 ~ 180mm.
In step 2) in, between drilling end and gas explosion rifle, the sealed borehole length in space is not less than 8m.
In step 3) in, the gas source of gases at high pressure can select air or industrial waste gas CO
2.
In step 4) in, often group boring can by the ascending order explosion successively of horizontal angle.
Compared with prior art, the invention has the beneficial effects as follows: 1) with air or industrial waste gas CO
2for the gas source of high pressure pneumatic component, not only eliminate the spark hazard that chemical explosive explosion is potential, and without chemical contamination, safe and reliable environmental protection again; 2) because high-pressure gas pressure is controlled and can repeat to carry out concussion burst to rock mass, make the energetic disturbance in coal seam little, top board presplitting is effective.
Accompanying drawing explanation
Fig. 1 is the horizontal projection schematic diagram of roof boring in the roof Advance presplitting method that the present invention is based on high pressure pneumatic component;
Fig. 2 is the vertical perspective view of roof boring in the roof Advance presplitting method that the present invention is based on high pressure pneumatic component;
Fig. 3 the present invention is based on roof Advance presplitting method mesohigh gas compression system, the gas explosion rifle of high pressure pneumatic component and schematic diagram of holing;
Be labeled as in figure: 1-10. holes; 11. haulage gates; 12. track crossheadings; 13. roofs; 14. air compressor machines; 15. high pressure tanks; 16. air delivering pipelines; 17. electrically-controlled valve pneumatic operated valve mechanical shearing valve; 18. gas explosion rifles; 19. sealing of hole fast hardening concretes; 20. Grouting Pipe.
Detailed description of the invention
embodiment 1
Below in conjunction with the embodiment (accompanying drawing) of a long 150m work plane, the present invention is further described.
Enforcement based on the roof Advance presplitting method of high pressure pneumatic component comprises the following steps successively:
1) performing one group diameter every 20m respectively to roof 13 at work plane haulage gate 11 and track crossheading 12 is the boring of 90mm, and often group boring is in fan-shaped layout and towards goaf, the elevation angle of boring 1 and 6,2 and 7,3 and 8,4 and 9,5 and 10
βbe respectively 39.23 °, 42.74 °, 44.06 °, 44.5 °, 44.69 °, horizontal angle
αbe respectively 45 °, 24.44 °, 15.12 °, 10.89 °, 8.49 °, drillable length is respectively 17.32m, 26.15m, 39.61m, 53.89m, 68.48m, like this, often the adjacent foot of hole level interval of group boring is 10 ~ 15m, often organize the vertical projection of boring and be respectively 10m and 10m along the horizontal projection in advance of the face direction, and the distance of foot of hole and working face wall or tunnel sidewall is 10m(is not less than 5m);
2) be placed in boring 5 by the gas explosion rifle 18 be connected with gases at high pressure compressibility by air delivering pipeline 16, adopt the gap of high-strength fast hardening concrete 19 pairs of drilling end and gas explosion rifle to carry out sealing of hole, sealed borehole length is not less than 8m;
3) air compressor machine 14 of gases at high pressure compressibility is started, after the gas pressure in high pressure tank 16 reaches setting value, electrically-controlled valve pneumatic operated valve mechanical shearing valve 17 automatically open, gases at high pressure in high pressure tank pass through gas explosion rifle 18 abrupt release explosion in boring 5 through air delivering pipeline 16, repeatedly can to circulate explosion to boring 5, the crack around boring is communicated with adjacent boring; The gas source of gases at high pressure is industrial waste gas CO
2;
4) gas explosion rifle 18 is withdrawn from boring 5, successively above-mentioned steps 2 is repeated to other boring) and 3), complete the Advance presplitting of roof.
Embodiment 2
Embodiment 2 is substantially identical with the step of embodiment 1, and difference is in step 1) in, the diameter of each boring is 75mm.
Embodiment 3
Embodiment 3 is substantially identical with the step of embodiment 1, and difference is in step 3) in, the gas source of gases at high pressure is air.
Embodiment 4
Embodiment 4 is substantially identical with the step of embodiment 1, and difference is in step 1) in, perform one group boring every 30m respectively to roof 13 at work plane haulage gate 11 and track crossheading 12.The elevation angle β of boring 1 and 6,2 and 7,3 and 8,4 and 9,5 and 10 is respectively 41.17 °, 43.11 °, 44.13 °, 44.52 °, 44.70 °, horizontal angle α is respectively 56.31 °, 34.29 °, 22.07 °, 16.09 °, 12.62 °, drillable length is respectively 20.62m, 28.44m, 41.16m, 55.04m, 69.38m, and often group boring is 15m along the horizontal projection in advance of the face direction.
Claims (2)
1., based on a roof Advance presplitting method for high pressure pneumatic component, it is characterized in that carrying out according to following steps:
1) perform one group of boring respectively to roof at a certain distance in work plane transport and track crossheading, this distance can not be greater than first and periodic weighting step pitch, and often organizes boring in fan-shaped layout and towards goaf; Each boring often in group boring is all with the different elevations angle
βand horizontal angle
αpierce roof, and make equal and along advance of the face direction the horizontal projection of the vertical projection of each boring also equal as far as possible; The distance of foot of hole and working face wall or tunnel sidewall is not less than 5m; The diameter of boring is 60 ~ 180mm;
2) the gas explosion rifle be connected with gases at high pressure compressibility is placed in boring, adopts high-strength fast hardening concrete or resin glue sealing of hole; Between drilling end and gas explosion rifle, the sealed borehole length in space is not less than 8m;
3) start gases at high pressure compressibility, by the gases at high pressure in high pressure tank by the abrupt release explosion in boring of gas explosion rifle, can repeatedly circulate explosion, and the crack around boring is communicated with adjacent boring;
4) above-mentioned steps 2 is repeated successively to often organizing boring) and 3), complete the Advance presplitting of roof; Often the ascending order explosion successively of horizontal angle is pressed in group boring.
2. the roof Advance presplitting method based on high pressure pneumatic component according to claim 1, is characterized in that in step 3) in, the gas source of gases at high pressure can select air or industrial waste gas CO
2.
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