Charge sealing method for deep hole roof pre-splitting blasting in coal mine

Abstract

The invention discloses a charge hole-sealing method for deep-hole roof presplitting blasting in an underground coal mine. The charge hole-sealing method comprises the following steps: step 1, prefabricating a plurality of explosive cartridges; step 2, assembling and connecting the plurality of explosive cartridges end to end to form an explosive cartridge group, embedding a detonator in explosiveat one end close to a reel at the rearmost end, of the reel, connecting the detonator with a detonation fuse and leading out the detonation fuse from one end of the reel, and assembling the pluralityof explosive cartridge groups in a flexible sleeve pipe; step 3, pushing the flexible sleeve pipe provided with the plurality of explosive cartridge groups to a part with a specified depth, of a blasting hole, by a push rod, and leading out and serially connecting detonation fuses of the plurality of explosive cartridge groups, and then connecting the detonation fuses with a blaster; step 4, pushing a backstop into the blasting hole by virtue of the push rod and locating the backstop at the outer sides of the explosive cartridge groups; and step 5, pushing the hole-sealing explosive cartridges into the blasting hole by virtue of the push rod and locating the hole-sealing explosive cartridges at the outer side of the backstop, and tamping and compacting the hole-sealing explosive cartridges by virtue of the push rod. The charge hole-sealing method disclosed by the invention has the following beneficial effects: rapid, fixed-point and accurate charge is realized for the blast hole in ahigh-position roof rock stratum in the underground coal mine, and rapid hole-sealing for the blast hole is realized.

Description

technical field [0001] The invention relates to the technical field of deep-hole roof pre-splitting blasting in underground coal mines, in particular to a charge sealing method for pre-splitting blasting of deep-hole roofs in underground coal mines. Background technique [0002] As my country's coal mines have turned to deep mining, the complexity of the deep mechanical environment and the change in the mechanical properties of coal and rock have significantly increased the intensity and frequency of coal mine roof dynamic disasters. According to the national coal mine accident statistics from 2014 to 2016, among all kinds of accidents in coal mines, the number of roof accidents and the death toll account for a relatively large proportion, and it is the key prevention and control object in coal mine accidents. [0003] With the increase of coal mine mining intensity and the increase of underground stope range, if the hard roof above the coal seam cannot collapse in time with...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for charging and sealing holes for deep-hole roof pre-splitting blasting in coal mines, so as to solve the problem of difficulty in charging and sealing holes in blasting holes in high-level roof rock formations in underground coal mines

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