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Hollow hole burn cut three-time blasting method

A hollow, blasting area technology, applied in blasting, earth-moving, mining equipment, etc., can solve the problems of low utilization rate of blasting holes, limited number of detonator segments used, and small circulation footage, so as to ensure the utilization rate of blasting holes and improve the The utilization rate of the blast hole and the effect of ensuring the cycle footage

Active Publication Date: 2021-06-15
SHANDONG UNIV OF SCI & TECH +4
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The object of the present invention is to provide a three-time blasting method of hollow hole straight hole cutting, to solve the following problems encountered in tunnel excavation using straight hole cutting blasting method: (1) The number of available detonator sections is limited, especially the use of coal mine permits Under the condition of using electric detonator, the problem of too many blasting times in the lower section
(2) Rocks falling from multiple blasts on the lower section or the first blasting of the pilot tunnel are scattered on the lower part of the working face and both sides of the blasted section of the pilot tunnel, and the unexploded parts on both sides are buried, resulting in low construction efficiency.
(3) The utilization rate of the hollow hole straight hole cutting blast hole is low, which leads to the low utilization rate of the blast hole and the small cycle footage of the full-section blasting excavation

Method used

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Embodiment Construction

[0052] combine Figure 1 to Figure 6 As shown, the specific implementation of a three-time blasting method for hollow hole straight hole cut provided by the present invention will be described.

[0053] Taking the auxiliary transportation roadway of a certain coal mine as an example, a three-time blasting method of hollow hole straight hole cutting is described. The roadway is a straight wall semi-circular arch section, the excavation width is 5.40m, the height is 3.75m, and the section area is 15.53m 2 . Its working capacity is 220ml, the detonation velocity is 3000m / s, the force is 0.01m, the diameter of the drug roll is 0.035m, the length is 0.40m, and the mass is 400g / roll. Use the permissible electric detonator for coal mines in the 1st to 5th section. The hole diameter is 0.133m, and the charge hole diameter is 0.042m. Before the blasting, the drilling, loading and transporting integrated machine was withdrawn to a distance of 15.0m from the excavation working face, ...

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Abstract

The invention discloses a hollow hole burn cut three-time blasting method. Specifically, a pilot tunnel is excavated on one side of the center line of a tunneling section and faces the direction of a non-protection target of a working face, the tunneling section is divided into an advanced pilot tunnel area and a main blasting area through the pilot tunnel, the advanced pilot tunnel area is subjected to blasting twice, and then the main blasting area is subjected to blasting for the third time; and the drilling footage of the third blasting is equal to the drilling footage of the first blasting of the leading pilot tunnel area, and after one blasting cycle, a reserved pilot tunnel is formed in a new tunneling section, so that the blasting can be performed according to the normal circulating drilling footage from the second cycle, and the situation that rock slag covers the bottom of the main blasting area after the first circulating pilot tunnel blasting is avoided, so that a quicker way is provided for blasting implementation of all sections.

Description

technical field [0001] The invention relates to the technical field of engineering blasting, in particular to a three-time blasting method for hollow holes and straight holes. Background technique [0002] During the excavation and construction of traffic tunnels and mine roadways, in order to improve the blasting efficiency, it is often necessary to increase the amount of charge at the cutting part to achieve a good blasting effect. Flying rocks produced by conventional trenching and blasting methods can be thrown to an area 20m to 30m away from the working face, and individual flying rocks can even reach an area of ​​40m. Blasting flying rocks may damage the excavation equipment and support near the excavation face facility. [0003] At present, in the tunneling construction of coal mine rock roadway, in order to improve the mechanization level of drilling and blasting construction of rock roadway excavation, an integrated machine for drilling, loading and transporting is...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04E21D9/00
CPCF42D1/00F42D3/04E21D9/006
Inventor 王海亮谷志民姜世斌杨波赵军李占海周勇周明聪孟祥慧李建伟张文明王振彪
Owner SHANDONG UNIV OF SCI & TECH
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