Smooth blasting method based on phi 32 mm cartridges

Abstract

The invention provides a smooth blasting method based on phi 32 mm cartridges. The method includes the steps that punching, powder charging and the initiation process are conducted on a working face, and a smooth blasting layer is composed of a peripheral smooth blasting hole array located on the outer side and more close to the boundary of the top, and an outer ring spallation hole array located in the peripheral smooth blasting hole array. The density coefficient m of peripheral smooth blasting holes ranges from 1.25 to 1.43. Charged powder in the peripheral smooth blasting holes in the peripheral smooth blasting hole array comprises bottom charged powder located at the bottoms and multiple bags of middle charged powder located at different depths in the holes. The powder charging amount of the middle charged powder is smaller than that of the bottom charged powder. The intervals between the bottom charged powder and the middle charged powder and between the bags of the middle charged powder are the same, and the initiation time of the peripheral smooth blasting hole array is later than that of the outer ring spallation hole array. Smooth blasting powder string processing procedures and processing materials are reduced; smooth blasting powder string processing cost, and cost of materials such as bamboo chips and adhesive tape are saved, and over-excavation is effectively controlled, so that a large amount of concrete backfill caused by over-excavation is reduced, and construction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and relates to a smooth blasting technology, in particular to a smooth blasting method based on a φ32mm charge coil. Background technique [0002] At present, the tunnel excavation controls the excavation profile, mainly adopts smooth blasting, and uses bamboo strips to bind and make fine charge rolls, such as charge strings with a diameter of 25 mm, which are loaded into smooth blasting holes for detonation. [0003] With the strengthening of my country's national strength and the domestic hydropower market entering the post-hydropower era, domestic construction units have contracted more and more foreign hydropower and non-hydropower projects. In foreign engineering construction, especially in underdeveloped countries such as Africa, pyrotechnic materials and materials commonly used in blasting construction, such as bamboo chips and fine charges, are often in short supply or unavai...

AI Technical Summary

Problems solved by technology

In foreign engineering construction, especially in underdeveloped countries such as Africa, pyrotechnic materials and materials commonly used in blasting construction, such as bamboo chips and fine charges, are often in short supply or unavailable for various reasons. Due to the problem of material supply, it is impossible to achieve the photoexplosion effect that meets the requirements

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