| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily execute the excavation along a scheduled excavation line in a smooth blasting method using a spacer. <P>SOLUTION: A spacer 1 for a blasting method is inserted in outermost explosive loading holes HI-HQ formed in a rock, and a loading space in which granular explosive BM is loaded and a non-loading space in which any granular explosive is not loaded are formed in an internal space of each explosive loading hole. The spacer is contracted by the external force when it is inserted in the explosive loading hole, and expanded by the elastic force when the external force is removed, and a contact part with an inner surface of the explosive loading hole is pressed against the inner surface of the explosive loading hole, and fixed to the explosive loading hole. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
