| 摘要 |
PROBLEM TO BE SOLVED: To provide a drilling method obtaining the fracture along a line of dry holes when rock, concrete or the like is crushed by a tool gathering expansive force such as a crushing agent in the case of fracture of the rock/concrete to carry out demolition work of the rock/concrete at a low cost, and besides, a construction period can be shortened. SOLUTION: Drilling is made so as to arrange the dry holes 3 without charging any crushing agent so that a charging hole 2 of the crushing agent goes away from the neighborhood of a certain part in accordance with a shape or a size anxious to crush a system 1 of the rock/concrete, and a curing such as the spread of a sheet or the like is executed after the crushing agent has been charged. COPYRIGHT: (C)2003,JPO
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