Internal throwing type bench blasting method

A step blasting and internal throwing technology, which is applied in blasting, earth-moving drilling, ground mining, etc., can solve the problems of easily destroying transportation channels, smashing workers and machines on the lower layers, and reducing throwing and the effect of explosive gas. , the effect of reducing the length of the blockage

Active Publication Date: 2021-12-24
ANHUI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary step blasting requires blasting holes on the working surface, and after the blasting, the rock throwing direction is the direction of the step surface, and the outside of the steps is the transportation channel. The rocks thrown during blasting can easily damage the transportation channel or damage the workers on the lower floor. and machines

Method used

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  • Internal throwing type bench blasting method
  • Internal throwing type bench blasting method
  • Internal throwing type bench blasting method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Based on the blasting process of the inner throwing type step in embodiment 1, the following steps are designed:

[0053] Step 1: Clean up the working surface 4 and prepare for hole layout;

[0054] Step 2: Calibrate the blasthole position of the inner throwing hole 1 on the working face 4;

[0055] Preferably, there are 7 internal blasting holes 1, the distance between adjacent internal blasting holes 1 is 4.5m, the diameter is 150mm, the wedge-shaped cutting method is adopted, the angle with the working face 4 is 80 degrees, and the depth of the blasting hole is 15m.

[0056] Step 3: Calibrate the blasthole position of the peripheral pre-splitting hole 2 on the working face, and the peripheral pre-splitting hole 2 is located on the top contour line of the earthwork to be blasted;

[0057] Preferably, the distance between the adjacent peripheral pre-splitting holes 2 is 4.5m, the row spacing of the peripheral pre-splitting holes 2 and the auxiliary holes 8 is 5m, the ...

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Abstract

The invention discloses an internal throwing type step blasting method. The method comprises the following steps that internal throwing holes, auxiliary holes, peripheral presplitting holes, bench presplitting holes and bench peripheral holes are sequentially formed in a working face; common cartridges are loaded into the inner throwing holes, the auxiliary holes, the peripheral pre-splitting holes, the bench pre-splitting holes and the bench peripheral holes; sealing is conducted; and millisecond detonation is performed. According to the method, the inner throwing holes are formed, the inner throwing holes are detonated firstly, the free faces of other blast holes are adjusted, and the throwing direction of rocks after blast hole explosion is changed.

Description

technical field [0001] The invention relates to the technical field of mining construction, in particular to an internal throwing step blasting method. Background technique [0002] In open-pit mining resource extraction, step blasting has become the main mining method. Nowadays, in order to improve the mining efficiency, many open-pit mines use multiple types of work at the same time, mining up and down at the same time, which requires good transportation channels. Ordinary step blasting requires blasting holes on the working surface, and after the blasting, the rock throwing direction is the direction of the step surface, and the outside of the steps is the transportation channel. The rocks thrown during blasting can easily damage the transportation channel or damage the workers on the lower floor. and machines. Therefore, it is necessary to design an internal throwing step blasting method to solve the above problems. Contents of the invention [0003] The object of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D1/08F42D1/18F42D3/04E21C41/30
CPCF42D1/00F42D1/08F42D1/18F42D3/04E21C41/30
Inventor 龚悦苏洪
Owner ANHUI UNIV OF SCI & TECH
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