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Deep-hole and shallow-hole combined bench blasting method capable of reducing blasting boulder rate

A technology of step blasting and large block rate, which is applied in blasting and other directions, can solve the problems of increasing secondary blasting workload, increasing blasting cost, and accelerating equipment wear, so as to improve blasting effect, reduce project cost and accelerate project progress.

Inactive Publication Date: 2012-06-20
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large pieces in the blasting ballast not only affect the efficiency of shoveling and accelerate the wear of equipment, but also increase the workload of secondary blasting, which seriously affects the progress of the project and increases the cost of blasting

Method used

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  • Deep-hole and shallow-hole combined bench blasting method capable of reducing blasting boulder rate
  • Deep-hole and shallow-hole combined bench blasting method capable of reducing blasting boulder rate
  • Deep-hole and shallow-hole combined bench blasting method capable of reducing blasting boulder rate

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Such as Figure 1~3 As shown, the deep and shallow holes combined with the stepped blasting method to reduce the blasting large block rate include the following steps:

[0018] (1) According to the triangular (or quincunx) arrangement of holes on the step 3 of the blasting area, and according to the design and requirements of open-air deep hole step blasting, deep blast holes are drilled to obtain the deep hole 1.

[0019] (2) Drill a shallow blast hole with a diameter Φ≤50mm at the center position between every two deep holes 1 in the same row to obtain shallow holes 2.

[0020] (3) Charge the deep hole 1 and the shallow hole 2 respectively, and arrange the priming charges to block the openings of the deep hole 1 and the shallow hole 2 .

[0021] (4) According to the detonation sequence 5 in the design requirements, the sequential detonation between rows is performed with a slight difference, and one blasting is enough.

[0022] The depth of the shallow hole 2 is gre...

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Abstract

The invention relates to a deep-hole and shallow-hole combined bench blasting method capable of reducing blasting boulder rate. The method comprises the following steps of: 1) drilling boreholes on the bench of a blasting area through a triangular or quincunx-shaped hole arrangement method according to open deep-hole bench blasting design and requirements to obtain deep holes; 2) drilling a shallow borehole with hole diameter being less than or equal to 50mm in the middle between every two deep holes in the same row to obtain shallow holes; 3) respectively charging the deep holes and the shallow holes, laying initiating explosive cartridges and blocking the mouths of the deep holes and the shallow holes; and 4) conducting row-to-row sequential short-delay initiation according to initiation sequence in design requirements and blasting in one step. The deep-hole and shallow-hole combined bench blasting method capable of reducing blasting boulder rate has the advantages that the problem of high boulder rate of blocked sections in a deep-hole bench blasting method is solved, the blasting effect is improved, the subsequent excavating and loading efficiency is improved, the engineering progress is accelerated and the engineering cost is reduced.

Description

technical field [0001] The invention relates to an engineering blasting method, in particular to a step blasting method in which deep and shallow holes are combined to reduce the blasting large block rate. Background technique [0002] With the continuous improvement of drilling rigs and shipping equipment, the continuous improvement of blasting technology and the increasing development of blasting equipment, the superiority of deep hole step blasting has become more obvious, and its application fields have been continuously expanded. It has been widely used in mining, During the rock blasting construction of railway and road construction, water conservancy and hydropower projects, and civil construction leveling, but due to the influence of geological conditions, types of explosives, construction technology, etc., especially because the explosives are mainly placed in the middle and bottom of the blast hole, the The impact of uneven distribution of explosion energy on the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/08F42D3/04
Inventor 言志信
Owner LANZHOU UNIVERSITY
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