Blast hole inner multi-point energy-gathered micro perforation type blasting method and installation structure thereof

Abstract

The invention discloses a blast hole inner multi-point energy-gathered micro perforation type blasting method and an installation structure thereof. The method includes the steps that firstly, explosive column plasticity is utilized, 1-6 energy-gathered covers with pointed-cone-shaped tops and bottom pressing edges are inserted into an explosive column from the side face of the explosive column through the pointed-cone-shaped structures on the tops till the bottom pressing edges of the energy-gathered covers face outwards and are attached to the surface of the explosive column, then the energy-gathered covers are fixed to the explosive column, manufacturing of an energy-gathered blasting cartridge is completed, and it is ensured that all the energy-gathered covers are arranged on the sameside of the explosive column; secondly, multiple energy-gathered blasting cartridges manufactured according to the first step are input into a blast hole, during inputting, it is ensured that the energy-gathered hole directions of the energy-gathered covers on the energy-gathered blasting cartridges face the free face in the radial direction, and the energy-gathered blasting cartridges are in clearance fit with the blast hole; and thirdly, blasting is conducted according to the blasting networking step of conventional deep hole blasting. By means of the blast hole inner multi-point energy-gathered micro perforation type blasting method and the installation structure thereof, the drilling number and the explosive unit consumption are reduced, the blasting efficiency is improved, and the drilling and blasting cost is obviously saved.

Description

technical field [0001] The invention belongs to the field of blasting construction, and in particular relates to a method for multi-point energy-gathering micro-perforation blasting in a blast hole and an installation structure thereof, and is especially suitable for blasting construction in medium and deep holes. Background technique [0002] The energy released when the explosive explodes in the rock mass is transmitted to the rock through the blasting stress wave and the expansion pressure of the detonation gas, causing the rock to break. But the energy actually used to break the rock is only a tiny fraction of the energy released by the explosives. Most of the energy is consumed in useless work, such as heat conduction, heat radiation, and excessive crushing and plastic deformation of the medium during the explosion, and part of the useless mechanical work is consumed in the vibration, throwing of rocks and the formation of air shock waves in the air. . When throwing b...

AI Technical Summary

Problems solved by technology

Trace it to its cause, mainly contain the following points: First, this method mainly has some effects in reducing the blasting dust, and the effect in reducing the unit consumption of explosives is not obvious

The 2nd, the water medium that adds in this method is segmentally isolated from the explosive, and the area of ​​direct contact is very small. After the explosive explodes, the energy-absorbing chemical bond of the water medium breaks and decomposes into H 2 and O 2 lack of basis

Third, if the water bag is placed at the bottom of the blasthole, it will inevitably increase the rate of large blocks at the bottom. If the water bag is placed on the upper part of the blasthole, it is equivalent to increasing the length of the blockage, which will inevitably increase the rate of large blocks at the upper part. If the water bag is placed in the middle of the blasthole, It is inevitable to form a segmented charge, which requires an increase in the number of detonators or the use of detonating cords, increasing the cost of blasting

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