Title:
METHOD FOR AUXILIARY TUNNELING BY MEANS OF FREEZING SHAFT-SINKING CARBON DIOXIDE PHASE CHANGE CRACKING AND DEVICE THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/174264
Kind Code:
A1
Abstract:
Disclosed is a directional CO2 cracker. Two rows of directional energy discharge openings (1, 1') are distributed at both sides of an energy discharge head thereof in the axial direction, and the phase angle of the two rows of directional energy discharge openings (1, 1') is less than 180 degrees; in a freezing shaft-sinking process, a plurality of directional CO2 crackers are arranged on the outer periphery of a working face, and a plurality of common CO2 crackers are arranged on the inner periphery of a wellbore; the directional energy discharge openings (1, 1') at the both sides of the energy discharge head of each of the directional CO2 crackers respectively face the directional CO2 crackers adjacent thereto; the directional CO2 crackers in an outer-ring borehole (3) are detonated first, and then, the common CO2 crackers in an inner-ring borehole (4) are detonated; the directional CO2 crackers in the outer-ring borehole (3) direct energy to be released along the directional energy discharge openings (1, 1'), and blasting cannot disturb a wall structure outside the wellbore; after the outer-ring borehole (3) is blasted, a communicating weak surface is formed among the outer-ring boreholes (3), and the entire outer-ring boreholes (3) form a protective ring; and when the inner-ring borehole (4) is blasted, the protective ring formed by the outer-ring boreholes (3) cuts off the propagation of blasting energy to the wellbore wall, and the disturbance thereof to the wellbore wall structure is reduced.
More Like This:
| WO/1979/000471 | METHOD FOR BLASTING ROCK |
| WO/2017/165988 | SEARCH METHOD OF ELECTRONIC DETONATORS FOR TUNNEL BLASTING |
Inventors:
HUANG BINGXIANG (CN)
ZHAO XINGLONG (CN)
CHEN SHULIANG (CN)
SHAO LUYING (CN)
ZHAO XINGLONG (CN)
CHEN SHULIANG (CN)
SHAO LUYING (CN)
Application Number:
PCT/CN2018/113603
Publication Date:
September 19, 2019
Filing Date:
November 02, 2018
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
XUZHOU USURE MINING TECH CO LTD (CN)
XUZHOU USURE MINING TECH CO LTD (CN)
International Classes:
F42D1/00
Foreign References:
| CN108625859A | 2018-10-09 | |||
| CN105066801A | 2015-11-18 | |||
| CN105888624A | 2016-08-24 | |||
| CN206787395U | 2017-12-22 | |||
| CA2618181C | 2011-03-15 | |||
| US20180195368A1 | 2018-07-12 |
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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