Patent ID: 8448554

Claim:
A blast treatment method for blasting a treatment subject having a bursting charge and a shell for housing therein the bursting charge, the method comprising: an inside explosive disposing step of disposing an inside explosive to be used to initiate detonation of the bursting charge and to blast the treatment subject around the treatment subject; an outside explosive disposing step of disposing an outside explosive having a greater detonation velocity than the inside explosive and used to initiate detonation of the inside explosive at positions on an outer side of the inside explosive; and a blast step of simultaneously initiating detonation of the outside explosive at a plurality of positions spaced from each other at predetermined intervals along a particular direction to thereby simultaneously initiate detonation of the inside explosive at a plurality of positions along the particular direction by the detonation of the outside explosive so that detonation of the bursting charge is initiated by the detonations of the inside explosive, and thereby blasting the treatment subject in such a manner that the detonations of the inside explosive are completed before the detonation of the bursting charge initiated by the detonations of the inside explosive is completed.