Construction method of energy cumulative presplitting and smoothsurface blasting and special device thereof

Abstract

It is a special-purpose device used for two-directional energy-focusing and smooth blasting, post standard knot of multisection energy-gathering pipe which is in the double ''V'' shaped energy-accumulating groove which is set on the pipewall full of detonator, each post standard knot is linked with connection casing on which there is energy-accumulating groove, centering ring in the hole is noosed on the standard joint of the binding energy tube so that the center lines of the upper and the lower energy-gathering groove like V shape are in the same surface in the blasthole. Orifice centering rings of the two V- shaped central whose orientation is the same with V- shaped energy-gathering groove are set on the noose annulus wall at the ground end of energy -gathering pipe at orifice of blasthole, which makes the center line of each energy-gathering groove like a V shape forms a surface of centering and coinciding with blasting surface in each blasthole and among. After detonating explosive, make shaped charge jet spark along initial small crack that forms while the crack begins to form, then forms presplitting or smooth blasting surface, and finish energy-gathering presplitting and smooth blasting. The invention can enhance utilization ratio of demolishing energy and debase quantity of drilled holes, the influence of destroying rock mass kept down is little and the blasting surface is more level.

Description

technical field [0001] The invention belongs to the field of blasting construction, and particularly relates to a construction method and device for pre-splitting and smooth blasting. Background technique [0002] In the late 1980s, those skilled in the art tried to use paper materials to process shaped charge tubes to form shaped charge coils, and did research on shaped charge pre-split blasting, but they could not be used for normal construction due to technical and technological limitations. For a long time, the research on shaped energy presplit blasting has been stagnant. After the 1990s, with the vigorous development of hydropower development and the large-scale development of national infrastructure, the need for engineering construction has made scholars have a strong interest in the experimental research of energy-gathering pre-split blasting, which has been in the ascendant in recent years. Numerous scientific and technical workers have designed various forms and ...

AI Technical Summary

Problems solved by technology

[0020] 1. Its biggest defect is that there is no "centering device", so the energy-gathering jet cannot be guaranteed to spray along the pre-split surface or the light-exploding surface, and the function of the energy-gathering jet cannot be fully exerted normally, and the energy-gathering jet cannot form a complete shaped jet surface

[0021] 2. The shaped charge rolls are generally circular, which does not change the force distribution of the explosive on the wall of the blast hole

[0022] 3. The structure is complex, the amount of drilling work in the construction is large, the cost is high, and the harmful effect on the retained rock mass is relatively large; it has no practical value and is difficult to be widely used in engineering

[0023] 4. Due to the above-mentioned problems, there are no reports of large-scale application of the above-mentioned pre-splitting and smooth blasting technologies

Images