Medium-depth hole pre-charging method

Abstract

The invention provides a medium-depth hole pre-charging method. The medium-depth hole pre-charging method comprises the following steps that before a blast hole is blasted, a detonating structure is placed in the blast hole from a hole opening of the blast hole in the full-length direction of the blast hole, the upper end of the detonating structure is made to be located at the bottom of the blast hole, and the lower end of the detonating structure serves as a detonating end to be placed at the hole opening of the blast hole; according to the preset blasting position, explosive is filled into the blast hole where the detonating structure is placed; the blast hole filled with the explosive is blocked by a blocking material, and the detonating end of the detonating structure is placed outside the blocking material; and the hole opening of the blast hole is plugged with a flame-retardant material, and the detonating end of the detonating structure is made to be located between the plugging material and the flame-retardant material. By means of the medium-depth hole pre-charging method, the problem that in the prior art, due to the fact that under the condition that the blast hole is likely to be damaged, drilling needs to be conducted again to solve the problem that the damaged blast hole cannot be charged with the explosive, the construction progress is affected, the construction cost is increased, and safety risks exist can be solved.

Description

technical field [0001] The invention belongs to the technical field of mine blasting, and more specifically relates to a method for preloading explosives in medium and deep holes. Background technique [0002] In mine excavation work, medium and deep hole blasting is widely used in various mining methods. It has the advantages of good crushing quality, low explosive unit consumption, and mechanized charge. Some mines are affected by the geological conditions of the mine. The ore rock is broken and the stope is under pressure. After the blasthole drilling is completed, the blasthole is seriously damaged. Charging, or the blasting effect after charging is not ideal. Even if some blastholes can be successfully blasted, the impact of the blasting vibration on the rear row of blastholes will intensify the damage to the blastholes, and even damage the brow line of the roadway, and the charging operation conditions are dangerous. [0003] At present, the above problems are genera...

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a method for pre-charging medium and deep holes to solve the current problem in the prior art that when the blast hole is easily damaged, it is necessary to re-drill to solve the damaged blast hole. The problem of not being able to charge the powder will affect the construction progress, increase the construction cost, and have safety risks, etc.

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