Anti-blockage method for bottom hole of mine stope and roadway driving working face

Abstract

The invention belongs to the field of mining and roadway driving, and relates to an anti-blockage method for a blasting bottom hole of mine stope and roadway driving. The method is characterized in that a mode that a bottom hole tube is inserted is adopted, wherein one end of a tube of a PVC (Polyvinyl Chloride) material or other tube materials is inserted into the bottom hole, and the other end of the tube is exposed in a driving working face; the length of the bottom hole tube in the hole is about 1.0-1.5 m, and the length of the tube exposed outside the hole is about 0.7 m; and the outer end is blocked by using a bottom hole tube cover. Because of the mounting of the bottom hole tube, charging of the bottom hole is not affected by loose gravels falling from the working face during chiseling of upper blast holes even the gravels cover the orifice of the bottom hole since explosive is charged into the bottom of the hole through the bottom hole tube; and the bottom hole tube in the blast hole has effects of supporting the hole wall, preventing the blast hole from collapse and avoiding the safety risk of hurting people by the gravels in a hole digging process. Though the bottom hole tube, the construction process is simplified, the construction efficiency is increased, the charging effect is improved, the blast depth is increased, and the compressive mining cost is reduced.

Description

technical field [0001] The invention relates to an anti-clogging method for bottom holes of mine stope and roadway excavation blasting, which realizes safe and efficient charging and blasting operations of excavation working faces under the condition of broken ore rocks. Background technique [0002] Mine stope and roadway excavation operations are generally divided into four stages: rock drilling, blasting, ventilation and ore (slag) extraction. Among them, rock drilling is a key link in the mining cycle, and the blasting effect directly affects the mine production efficiency. high and low. Generally speaking, stope blasting needs to excavate cut holes, auxiliary holes and peripheral holes on the excavation face, and the peripheral holes can be divided into top holes, bottom holes and auxiliary holes. The cut hole is used to blast out a new free surface to create favorable blasting conditions for other post-blast holes; the auxiliary hole uses the free surface created by...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the technical difficulties existing in excavating the bottom hole during stope and roadway excavation, the present invention provides a bottom hole anti-blocking method, which can prevent the upper Drilling slag will bury the bottom hole, which will make it difficult to drill rock or charge powder in the bottom hole. Cleaning up these falling gravels will prolong the construction time and reduce the construction efficiency; at the same time, the bottom hole pipe effectively solves the collapse of the bottom hole , blocking, speeding up the charging process, increasing the blasting footage, and reducing the comprehensive cost of roadway excavation

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