| 摘要 |
PROBLEM TO BE SOLVED: To provide a disassembling method capable of suitably disassembling a concrete member by a small quantity of charge.SOLUTION: A concrete member 1a is bored toward the inside from an outer surface 11, and a plurality of charge holes 3 are formed. An explosive 5 is intensively arranged at a charge point 14 present in a position of a predetermined charge depth 13 by the respective charge holes 3. Blasting in the respective charge holes 3 is simultaneously executed, and a conical divided surface 4 expanding toward the outer surface 11 from the respective charge points 14 is serially continued, and concrete is divided by a continuous dividing surface 21 of continuing the divided surface 4. A charge quantity is calculated based on an effective horizontal projected area &Sgr;Ac on the outer surface 11 of the continuing divided surface 4. |
