Five-segment-type millisecond electric detonator secondary blasting construction method applied to blasting of high-gas large-section tunnel

A secondary blasting and construction method technology, applied in the field of blasting, can solve the problems that cannot be applied to the environment with methane and coal dust, and achieve the effect of improving construction efficiency and ensuring construction safety

Active Publication Date: 2015-11-04
THE FOURTH ENG CO LTD OF CTCE GRP
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantage that the existing nonel detonation construction method cannot be applied to the environment with methane and coal dust, and to provide a five-stage millisecond electric

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  • Five-segment-type millisecond electric detonator secondary blasting construction method applied to blasting of high-gas large-section tunnel
  • Five-segment-type millisecond electric detonator secondary blasting construction method applied to blasting of high-gas large-section tunnel
  • Five-segment-type millisecond electric detonator secondary blasting construction method applied to blasting of high-gas large-section tunnel

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Embodiment Construction

[0024] (1) blasting test: before the blasting construction of the present invention, prepare corresponding blasting test outline, after design approval, select different mileage sections, carry out blasting test, according to blasting test result, adjust blasting parameter, until obtaining best blasting effect, Take the adjusted blasting parameters as the basis for on-site blasting and excavation;

[0025] (2) Surface scum cleaning: In front of the construction gun, excavators are used to clean loose rocks or rock blocks on the excavation face to ensure the safety of the construction environment.

[0026] (3) Measurement: Before drilling, measuring technicians measure the section size of the tunnel face and the coordinates of the centerline (cross-line position), and provide the on-site pre-blasting conditions to the technicians and the drilling team.

[0027] (4) Design: The technicians carry out the blasting design according to the on-site measurement results, determine the ...

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Abstract

The invention discloses a five-segment-type millisecond electric detonator secondary blasting construction method capable of being applied to a high-gas large-section tunnel, and relates to selection of blasting construction electric detonators in the environment where gas or coal dust exists in a coal measure stratum passing segment of the tunnel or an excavation space or a blasting region. Blasting holes are designed according to tunnel surrounding rock and the outline of an excavated section, i.e., breaking-in holes, inner-circle auxiliary holes, outer-circle auxiliary holes, periphery holes and bottom-side holes are blasted in batches zone by zone; millisecond delay electric detonator segments are designed according to the blasting region; practical analysis is optimized constantly. The blasting construction method has great popularization significance in uncovering a coal seam safely and smoothly at a tunnel test mileage segment and achieving rapid and safe blasting and tunneling of the high-gas large-section tunnel.

Description

technical field [0001] The invention relates to the blasting technology in the coal seam gas environment, especially the blasting in the high-gas large-section tunnel environment. Background technique [0002] At present, with the rapid development of railways and highways, the ratio of tunnels increases, more and more tunnels pass through coal-measure strata, and the safety problems of gas tunnel blasting construction become more and more prominent. Tunnel blasting generally adopts high-section (15-19 section) nonel to detonate. After the nonel is excited, it propagates a detonation wave to trigger the detonator, and then detonates the explosive. [0003] Because the structural design of high-level nonel tubes and long delay time can easily cause gas or coal dust explosions, it has been determined that the gas concentration within 360ms after blasting in high-gas tunnels or mines will generally not exceed 1%, and the adjacent sections of millisecond blasting The interval t...

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
Inventor 罗彬刘文兵袁国马海贤张国亮李世甫赵仁超
Owner THE FOURTH ENG CO LTD OF CTCE GRP
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