Tunneling carbon dioxide phase change directional pressure relief cracker and application method thereof

Abstract

The invention provides a tunneling carbon dioxide phase change directional pressure relief cracker and an application method thereof. The cracker comprises a liquid storage pipe used for storing liquid-state carbon dioxide, a filling valve, a heater and an explosion venting head. The explosion venting head comprises an explosion venting pipeline of a Y-shaped structure, the explosion venting pipeline comprises a first pipeline, a second pipeline and a third pipeline, the first pipeline, the second pipeline and the third pipeline are in communication, one end of the first pipeline is connectedwith the liquid storage pipe, the other end of the first pipeline is obliquely connected with the head end of the second pipeline and the head end of the third pipeline, and the tail end of the secondpipeline and the tail end of the third pipeline face the free face of a to-be-tunneled roadway and are provided with an explosion venting opening. The explosion venting opening is used for carrying out explosion venting on carbon dioxide gas, and the included angle of the explosion venting opening and the axis of a drilled hole is smaller than 90 degrees. The cracker is fixed in the drilled holein an inverted manner and can impact on the hole wall along the oblique angle in the explosion venting direction in the exploding process, the advantage that impact waves are released towards an orifice along the reflection angle is achieved, and the problem about stability of existing crackers in drilled holes is solved. Energy losses are reduced, and the danger of counter impacting of the cracker is eliminated.

Description

technical field [0001] The invention belongs to the technical field of cracking and blasting devices, and in particular relates to a carbon dioxide phase change directional pressure relief cracker for excavation and a use method thereof. Background technique [0002] In the process of roadway excavation in coal mines, except for medium and large mines equipped with fully-mechanized excavators, most small mines are still dominated by explosive blasting. Due to the special environment of the excavation working face, explosive blasting will produce spark leakage and huge energy detonation waves. Once the gas in the excavation working face exceeds the limit, the leakage spark of the explosive will easily cause a gas explosion accident. Especially for outburst coal seams, explosives The generated detonation waves are also likely to induce major coal and gas outburst accidents. At the same time, there are certain risks in the gun inspection process after gunpowder blasting. [00...

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Problems solved by technology

[0006] The object of the present invention is to provide a directional pressure relief cracker for excavation and its use method, in order to overcome the problems of low gas energy utilization rate, poor blasting effect, low Problems such as large recovery resistance and long blasting engineering cycle

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