Charging device for presplitting blasting of peripheral holes of roadway

Abstract

The invention belongs to the field of blasting, and particularly discloses a charging device for presplitting blasting of surrounding holes of a roadway, the middle of a shock-insulation energy-gathering pipe is recessed inwards to form an energy-gathering groove, a top cover plate is arranged at the upper end of the shock-insulation energy-gathering pipe, a bottom cover plate is arranged at the lower end of the shock-insulation energy-gathering pipe, and blasting charges and air columns in the shock-insulation energy-gathering pipe are designed at intervals. A circle of pressure-bearing water medium is arranged on the periphery of the explosive bag, and a wood chip spacing bag is arranged between the explosive bag and the air column. On the basis of the confined water blasting action principle, the presplitting blasting method adopting confined water and air column spaced charging is provided, and the presplitting blasting method has positive significance in guaranteeing smooth blasting of peripheral holes, improving the forming effect of a hard rock roadway, controlling the charging cost and guaranteeing safe production.

Description

technical field [0001] The invention belongs to the field of blasting, and in particular relates to blasting methods for underground rock roadways and tunnels in coal mines. Background technique [0002] At present, the drilling and blasting method is still the main method for excavating underground rock roadways in coal mines, which has the advantages of strong adaptability, high reliability, and controllable costs. The layout of blastholes in drilling and blasting blasting is mainly divided into cutting holes, auxiliary holes and peripheral holes. The peripheral holes are arranged around the excavation section, and the bottoms of the holes all fall on the same plane. The blastholes are mainly used to control the excavation contour and roadway section. forming. The surrounding holes of rock roadway excavation generally adopt a straight hole bottom charge structure, and technologies such as directional slit pre-splitting blasting can be used in soft rock roadways to realize...

AI Technical Summary

Problems solved by technology

The charge structure can make the energy of the explosive propagate in the direction of pre-cracking, and reduce the impact pressure of the explosion on the surrounding rock. However, for extra-hard rock (Platinian coefficient above 10), the explosive charge is significantly increased. , the blasting vibration is more severe, causing serious damage to the surrounding rock

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