Method for processing suspension top by medium-deep hole blasting on upper and lower shoes

Abstract

The invention relates to a method for processing suspension top by medium-deep hole blasting on upper and lower shoes, comprising the steps of: simultaneously tunneling two drilling connection tunnels, on a tunnel upper shoe and a tunnel lower shoe of an electric shovel discharging tunnel, perpendicularly passing through a mineral vein; after the drilling connection tunnels pass through the mineral vein, tunneling two medium-deep hole drilling tunnels which is in parallel with the electric shovel discharging tunnel, faces towards the direction of the suspension top part, and is perpendicularly connected with the drilling connection tunnel, wherein the medium-deep hole drilling tunnels are tunneled exceed the suspension top part; performing construction of medium-deep holes in the two drilling tunnels towards the suspension top part according to the data for ore bring-down through blasting, such as row distance of 1-1.5m and hole bottom distance of 1-1.5m; drilling holes in each row; loading explosive in the medium-deep holes by a explosive loading machine; performing millisecond blasting by a millisecond detonator; and thereby breaking the suspension top by one-time blasting. Themethod for processing suspension top by medium-deep hole blasting on upper and lower shoes has the advantages that the deslagging is performed by the electric shovel, so that the labor intensity is small and the construction efficiency is high; operation is not performed on the tops of gobs so that the operation is ensured to be absolutely safe.

Description

Technical field [0001] The invention belongs to the field of mining technology, and particularly relates to a method for treating suspended roofs by blasting in upper and lower sides with medium and deep holes. Background technique [0002] At present, the main mining method for steep ore bodies is the pillarless sublevel caving method. This mining method is to dig a mining roadway in the ore body and use upward fan-shaped holes to blast the ore for mining. However, this kind of mining method is sometimes due to inaccurate drawings or inaccurate construction positions, resulting in improper hole depth design, hole not punching in place, or charging is not in place, resulting in poor blasting effect and the top not being lowered. It is the suspended ceiling. After the roof is suspended, it not only affects the output, but also becomes a safety hazard if it is handled properly. Once it is down, it is very dangerous. The original suspended roof treatment method is to dig a flat la...

AI Technical Summary

Problems solved by technology

However, sometimes due to inaccurate drawings or inaccurate construction positions of this mining method, the hole depth design is not in place, the hole is not drilled in place, or the charge is not in place, resulting in poor blasting effect and the top is not put down. is the hanging roof

After the roof is suspended, it not only affects the output, but also becomes a safety hazard if it is handled improperly. Once it is down, it is very dangerous

The original method of overhanging the roof is to dig a level road to the upper or lower side of the forklift out of the mine, and then dig a patio upwards. After reaching the overhanging top, dig the main roadway of the chamber. Carry out chamber construction, such as figure 1 As shown, manual slag extraction is required, the excavation volume is very large, the labor intensity is high, the construction period is long, and it is very dangerous for workers to construct in the suspended roof entity

The suspended roof not only causes the loss of mineral resources and increases the mining cost, but more importantly, it leaves hidden safety hazards and directly threatens the lives of mining workers. Therefore, no matter from the actual needs of production or from the perspective of safety, suspended Top must be well resolved, figure 1 1 is the suspended roof, 2 is the main roadway of the chamber, 3 is the patio, and 4 is the forklift exit roadway

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