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Safety technical requirements for deep hole pre-splitting blasting
Release time:
2019-09-21
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Source:
In order to prevent deflagration, water-containing type must be selected.coal minePermissibility of explosives, strictly limited single hole charge. Coal mine allowable millisecond detonator must be checked in advance before leaving the warehouse. Blast hole arrangement, hole depth, charge and initiation sequence must be strictly in accordance with the provisions of the blasting instructions. Due to the coal cinder in the blasthole and the influence of ground stress, when the drill pipe of the blasthole is pulled out, the blasthole is probed with the probing pipe, and the depth of the blasthole is recorded to determine the quantity and length of the charge. In order to ensure the reliability of the detonation of the slender coil with interval charge or continuous charge, the coal mine detonating cord must be laid along the whole length of the hole. The length of the hole sealing mud shall be in accordance 《ProceduresThe provisions of Article 359. Blasting strictly implement the "one gun three inspection system" and "three people chain blasting system". Before blasting, the blaster must check the full resistance of the electric blasting network. In order to prevent delayed protrusion, wait for at least 20min after blasting before entering the working face. There must be evacuation, power failure, warning, long-distance blasting, reverse air door, etc.SecurityProtectionMeasures. The mining face of the outburst mine shall be stopped for 4~8h after pre-splitting blasting. The distance between evacuation and blasting shall be determined according to the degree of outburst danger, generally not less than 200m, and the evacuation personnel shall be in fresh air flow.
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