Millisecond multilevel directional blasting dry ice fracturing method and exploding pipe

A technology of directional blasting and blasting pipe, which is applied in blasting, blasting cylinder, earth-moving drilling and mining, etc., to achieve the effects of easy implementation, simple method, novel and unique structure

Active Publication Date: 2017-07-07
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] , which can effectively solve the probl

Method used

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  • Millisecond multilevel directional blasting dry ice fracturing method and exploding pipe
  • Millisecond multilevel directional blasting dry ice fracturing method and exploding pipe
  • Millisecond multilevel directional blasting dry ice fracturing method and exploding pipe

Examples

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Effect test

Embodiment 1

[0034] 1. Drill the blast hole 9 and the drainage hole 10 on the coal seam working face, and the distance L between the blast hole 9 and the drainage hole 10 is 2000mm;

[0035] 2. Making blasting tubes;

[0036] The blasting tube includes a plurality of blasting units, which are separated by gun mud 7 between two blasting units, and each blasting unit includes an outer tube 1 and an inner tube 2 made of PVC material, and the outer tube 1 and the inner tube 2 Both are hollow tubular structures with one end open and one end sealed. The inner tube is set inside the outer tube. The outer wall of the inner tube, the inner wall of the outer tube, and the sealed end wall of the outer tube together form an outer filling cavity 1a for filling dry ice. The inner cavity of the inner tube An inner filling cavity 2a for filling explosives is formed, the outer filling cavity 1a is filled with dry ice 5, the inner filling cavity 2a is filled with explosives 6, and the explosives 6 are provi...

Embodiment 2

[0040] 1. Drill the blast hole 9 and the drainage hole 10 on the coal seam working face, and the distance L between the blast hole 9 and the drainage hole 10 is 2000mm;

[0041] 2. Making blasting tubes;

[0042] The blasting tube includes a plurality of blasting units, which are separated by gun mud 7 between two blasting units, and each blasting unit includes an outer tube 1 and an inner tube 2 made of PVC material, and the outer tube 1 and the inner tube 2 Both are hollow tubular structures with one end open and one end sealed. The inner tube is set inside the outer tube. The outer wall of the inner tube, the inner wall of the outer tube, and the sealed end wall of the outer tube together form an outer filling cavity 1a for filling dry ice. The inner cavity of the inner tube An inner filling cavity 2a for filling explosives is formed, the outer filling cavity 1a is filled with dry ice 5, the inner filling cavity 2a is filled with explosives 6, and the explosives 6 are provi...

Embodiment 3

[0046] 1. Drill the blasthole 9 and the drainage hole 10 on the coal seam working face, and the distance L between the drainage hole 10 and the blasthole 9 is 2000mm;

[0047] 2. Making the blasting tube

[0048] The blasting pipe includes a plurality of blasting units, and the two blasting units are separated by gun mud 7, and each blasting unit includes an outer tube 1 and an inner tube 2 made of PVC material, and the outer tube 1 and the inner tube 2 are both It is a hollow tubular structure with one end open and one end sealed. The inner tube is sleeved in the outer tube. The outer wall of the inner tube, the inner wall of the outer tube and the sealed end wall of the outer tube together form an outer filling cavity 1a for filling dry ice. The inner cavity of the inner tube constitutes The inner filling cavity 2a for filling explosives, the outer filling cavity 1a is filled with dry ice 5, the inner filling cavity 2a is filled with explosives 6, and the explosives 6 are pr...

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Abstract

The invention discloses a millisecond multilevel directional blasting dry ice fracturing method and an exploding pipe. The method comprises the following steps: 1) drilling a blast hole and a pumping hole in a coal seam working surface; 2) preparing the exploding pipe; 3) filling the exploding pipe into the blast hole, connecting the end part on the inner side of the exploding pipe with the hole bottom of the blast hole, sealing an opening part at the external end of the blast hole by using the sealing tamping plug and guiding a leg wire of a millisecond delay electric detonator of each exploding unit out of the blast hole; 4) gradually exploding each exploding unit at interval of 40 milliseconds by the millisecond delay electric detonator in the sequence from interior to exterior of the blast hole. According to the invention, the generated quantity of cracks can be effectively controlled, the extending distance of the cracks can be increased without serious damage to the hole wall, CO2 generated by dry ice subliming along with the extension of the cracks can effectively displace the coal-mine gas, the gas discharging efficiency can be increased, and meanwhile, in the subliming process of the dry ice, a large quantity of exploding heat can be absorbed, the exploding temperature can be reduced and the exploding process is more safe and reliable.

Description

technical field [0001] The invention relates to a millisecond multi-stage directional blasting dry ice fracturing method and a blasting pipe, which are used for pre-draining coal seam gas and preventing coal and gas outburst. Background technique [0002] The main power source of my country's national economic construction is coal, which accounts for more than 70% of my country's total energy structure. At present, there are 26,000 coal mines recorded in my country, all of which are gas mines, and more than half of them are high-gas mines. Coal mining is subject to certain conditions, including natural geological conditions, underground mining conditions, miners' skills and equipment, etc. Therefore, coal mining has problems such as poor safety and reliability, and a high incidence of safety accidents, the most serious of which is gas accidents. The frequent occurrence of gas accidents has hindered the development of the coal industry, brought great economic and psychologic...

Claims

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Application Information

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IPC IPC(8): E21B43/263E21F7/00F42B3/04F42B3/10F42B3/103F42B3/28F42D1/055F42D1/08F42D3/04
CPCE21B43/263E21F7/00F42B3/04F42B3/10F42B3/103F42B3/28F42D1/055F42D1/08F42D3/04Y02P90/70
Inventor 梁为民王以贤杨小林褚怀保吕小师龚健王金星王新生高洁如
Owner HENAN POLYTECHNIC UNIV
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