| 摘要 |
PROBLEM TO BE SOLVED: To provide an economical blasting method for bedrock capable of efficiently blasting without the dangers of misfires with a small amount of charged explosives, few vibrations, little noise, and a small amount of occurrence of boulder stones by the effective explosion. SOLUTION: A hole of a predetermined depth and arrangement is bored in a bedrock to be cut. A detonator 12, a primer 13, and explosives are loaded in the bored hole. Air tubes 15 of a diameter smaller than that of the bored hole and an air layer inside are inserted in the hole, and its outside is wrapped with the explosives to embed the air tubes 15 inside explosive-charged layers 14a-14e. The air tubes 15 and the explosives are sequentially loaded to form an explosive-charged hole 11. The upper part of the explosives loaded in the explosive-charge hole 11 is tamped by a tamping material 18. The primer 13 is detonated by a blasting machine to expose the detonating charge 12 and the explosives in the explosive-charged hole 11. COPYRIGHT: (C)2003,JPO
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