Presplit hole drilling method

A drilling method and pre-splitting technology, applied in directional drilling and other directions, can solve the problems of low precision, difficult construction, slow operation speed, etc., and achieve the effect of clear and smooth outline

Inactive Publication Date: 2017-03-22
CHINA GOLD INNER MONGOLIA MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a pre-splitting drilling method to solve the problem of difficult

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Embodiment Construction

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0016] see Figure 1~2 , the steps of pre-split hole drilling are as follows:

[0017] (1) Two vertical lines with a height of 1.7m are erected at 5m and 10m directly in front of the vertical direction of the designed pre-cracking line. The human eye can see the center of the drill pipe through the two vertical lines, and use the method of three points and one line to control Azimuth of the borehole;

[0018] (2) Level the site before drilling, drill two 3m ...

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Abstract

The invention discloses a presplit hole drilling method. The method comprises the steps that two vertical lines are erected right ahead of the vertical direction of a designed presplit line, the midpoint of a drill rod is aligned, and the azimuth angle of a drilling hole is controlled in a three-point one-line mode; and two shallow holes are drilled behind the presplit hole, supporting vertical columns are placed into the shallow holes, a transverse rod is transversely placed on the vertical columns to support a big arm of a drilling machine, and the big arm of the drilling machine is fixed to the transverse rod, so that the angle of the drill rod on the vertical line is measured and adjusted through a geological compass. By means of the presplit hole drilling method, the angle error of the presplit hole can be controlled within one degree, seismic explosive columns serve as explosives for presplitting, and a formed step is clean in slope surface and clear and flat in outline; the half-hole rate reaches 60% or above in a soft rock area and reaches 90% or above in a hard rock area; the slope surface unevenness degree is smaller than 15 cm; and the desired effect is achieved, and the side slope stability is ensured.

Description

technical field [0001] The invention relates to the field of open-pit mine blasting, in particular to a pre-split hole drilling method. Background technique [0002] Pre-splitting blasting is to arrange dense blastholes along the design excavation boundary, and initiate blasting before the main blasting area, so as to form a pre-crack between the blasting area and the reserved area, so as to reduce the damage of the main blasting to the retained rock mass and form a smooth profile surface. Blasting operations. Pre-splitting perforation is the most important part of pre-splitting blasting. At present, in terms of pre-splitting perforation, the types and models of drilling rigs used are different, and the drilling methods are also different; in 2004, the eighth project of China Water Resources and Hydropower Corporation Bureau Co., Ltd. modified the YQ-100B down-the-hole drilling rig. The method of pre-splitting and perforating by building the drilling rig bracket is the late...

Claims

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Application Information

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IPC IPC(8): E21B7/04
CPCE21B7/04
Inventor 李雪峰张海涛王泽军杨晓光王亚强刘思铨
Owner CHINA GOLD INNER MONGOLIA MINING
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