One-time well construction method for chute well and cutting well

Abstract

The invention provides a one-time well-forming construction method for sliding wells and cutting wells, comprising: step 1, using a down-the-hole drilling rig to drill rocks to obtain nine blastholes, each blasthole is arranged perpendicular to the working face; the blasthole layout adopts Blasting funnel method, including one cut hole, four auxiliary holes and four peripheral holes; step 2, charge the blastholes formed after rock drilling; among them, no charge is charged in each auxiliary hole, and the cutting Fill the preset explosives into the eye and each peripheral eye respectively; step 3, adopt the blasting sequence from bottom to top, and carry out multiple blasting in sections; and when blasting each time, use The way of half-second differential blasting is blasting one by one. The invention improves the construction environment of the chute and cutting well, improves the efficiency of rock drilling and blasting, has good blasting effect, low explosive unit consumption, reduces damage to surrounding rock during blasting, and has high safety.

Description

technical field [0001] The invention relates to the technical field of chute and cutting well construction, in particular to a one-time well-forming construction method for chute and cutting wells. Background technique [0002] In traditional tunneling and cutting wells, workers need to work in the well. The labor intensity of the workers is high, the dust concentration of the working flour is high, the working conditions are poor, and the safety is not high. It is easy to cause safety accidents such as falling from heights, gun smoke poisoning, and roof fall. . With the continuous development of mine technology, the one-time well construction technology has gradually been fully developed and applied. When excavating a raised shaft (or chute) in an underground mine, one-time well-forming excavation is often used. The traditional one-time excavation of wells still adopts the method of cutting first in ordinary roadway excavation. For example, the specification of the roadw...

AI Technical Summary

Problems solved by technology

For example, the specification of the roadway is 3m*3m, and there are 11 deep holes (diameter 130mm) in total, 8 charging holes for each blasting, 288kg for each blasting charge, 4m for each blasting height, and 67kg / m3 explosive charge per unit. This method consumes a lot of explosives per unit, high construction cost, great damage to the surrounding rock of the chute and cutting well, and the blast hole is easy to block after blasting

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