Deep hole presplitting water coupling blasting explosive charging structure and construction method

Abstract

The invention discloses a deep hole presplitting water coupling blasting explosive charging structure and a construction method. The deep hole presplitting water coupling blasting explosive charging structure comprises a blocking section and an explosive charging section. The explosive charging section is formed by connecting a plurality of PVC explosive charging pipes. Explosives are bundled in the pipes in a staggered mode. Two bundles of explosives at the explosive charging bottom end are inserted into electric detonators correspondingly. A bundle of explosive is inserted into one electricdetonator at the explosive charging top end. The three electric detonators are connected in series. A flow limitation blocking device is arranged at the blocking section. The blocking device comprisesa flow limitation water pipe, an expansion waterstop strip, waterproof tin foil paper and a taper sleeve. The flow limitation water pipe is an L-shaped PVC slim pipe. When a hole outer port of the flow limitation water pipe faces downwards, the lower half portion of the expansion waterstop strip is wrapped by the waterproof tin foil paper. The taper sleeve is arranged on the outlet side of the expansion waterstop strip. During construction, during explosive charging, the PVC explosive charging pipes are connected and extended into a blast hole. The blocking method is adjusted according to a water-bearing stratum and a non-water-bearing stratum. The explosive charging structure is optimized by the aid of water pressure blasting advantages and is suitable for solving the blocking problem ofthe water-bearing stratum.

Description

technical field [0001] The invention relates to a charge structure for deep hole blasting, in particular to a charge structure for deep hole pre-split water coupled blasting. Background technique [0002] Deep hole pre-splitting blasting is widely used in geotechnical engineering, and its purpose is to fully increase the cracks in the rock mass to meet engineering requirements. The depth of the deep hole pre-splitting blasting blast hole can reach more than 10m. The traditional charging method is to use the blaster stick to push the bundled strip charge into the bottom of the blast hole, and then fill enough blasting mud. The main disadvantages are: (1) packing The mud section is long, and repeated filling of mud can easily damage the detonator connecting line; (2) It is difficult to deal with the explosive residue and residual explosives. Due to the deep placement of explosives and the large amount of mud sealing, it takes time and effort to flush out the explosives with a ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the current deep-hole pre-splitting blasting adopts the hydraulic blasting form, and it is difficult to charge and block, and proposes an optimized charge structure for deep-hole pre-splitting blasting, which is also suitable for solving the problem of plugging in water-bearing formations.

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