Hard stone drift composite reinforcing vertical wedge cutting method

A technology of wedge-shaped cutting and rock entry, which is applied in blasting and other directions, can solve the problems of urgent optimization research, low blast hole utilization rate, and high consumption of explosive detonators, so as to improve blast hole utilization rate, increase single-cycle footage, and good blasting effect Effect

Inactive Publication Date: 2015-08-26
周忠国
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Problems solved by technology

At present, wedge-shaped cutouts are widely used. A pair of cutout holes is used for relatively hard and large-section transportation lanes or return air lanes. The blasting effect is poor, the single-cycle footage is low, the utilization rate of blastholes is not high, and the consumption of explosive detonators is large. , it is urgent to study the optimization of cutting methods in hard rock roadways

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  • Hard stone drift composite reinforcing vertical wedge cutting method
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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the described embodiments.

[0014] In the excavation working face of the transport roadway that adopts hydraulic jumbo rock drilling, two center holes 1 are vertically arranged at a distance of 800 mm to 1200 mm from the bottom plate at the midpoint of the centerline groove cavity of the roadway, and three pairs of main cuts are symmetrically arranged on both sides of the center hole 1 Eye 2 and two pairs of auxiliary cutting eyes 3 form a composite reinforced vertical wedge-shaped cutting. The center eye 1 has a hole spacing of 400mm and a hole depth of 2.1m to 2.2m. The main cutting eyes 2 are adjacent to each other. The vertical hole distance between the two eyelets is 400mm, the eyehole depth is 2.13m~2.23m, the horizontal angle is 70°, the distance between the 2 holes of each pair of main cutout holes is 1660m...

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Abstract

The invention discloses a hard stone drift composite reinforcing vertical wedge cutting method. Two center eyes are formed at a center point of a tunneling roadway center line groove cavity. Three pairs of main cutting eyes and two pairs of auxiliary cutting eyes are symmetrically formed in the two sides of the center eyes. The hole space distance between the center eyes is 400 mm. The vertical hole distance between two adjacent eye holes of the main cutting eyes is 400 mm. The horizontal angle is 70 degrees. The hole distance between two adjacent eye holes of the auxiliary cutting eyes is 400 mm. The horizontal angle is 83 degrees. The main cutting eyes are subjected to detonation through a section of a detonator. The auxiliary cutting eyes and the center eyes are subjected to detonation through two sections of detonators. Center eye blast hole diameter is 42 mm. Large cartridges with the diameter of 40 mm are used for normal charging. Main cutting eye and auxiliary cutting eye blasting hole diameter is 42 mm. Large cartridges with the diameter of 40 mm are used for reverse charging. Normal cartridges are used for forward charging for other blasting holes. At morning shift, a medium-deep hole is used for one-cycle detonation; at noon shift and night shift, two cycles are carried out; detonation depth at each cycle is 1.6-1.7 m.

Description

technical field [0001] The invention relates to a wedge-shaped cutting method for a rock roadway, in particular to a method for compositely strengthening a vertical wedge-shaped cutting method for a hard rock (solidity coefficient f=10-12) roadway. Background technique [0002] Reasonable mining deployment is the basic guarantee for safe production, high output and high efficiency in coal mines. With the widespread use of fully mechanized excavators, the speed of coal roadway excavation has been greatly improved, and the speed of rock roadway excavation has become a prominent contradiction. Drilling and blasting method is the main method used in rock roadway excavation construction at present, especially for rock roadway with firmness coefficient f=10~12, it is very uneconomical to use fully mechanized excavator, the consumption and wear of picks is large, and the construction progress cannot be improved at all. stand up. Judging from the existing technology and field pract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D1/08
Inventor 周忠国
Owner 周忠国
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