ANTI-BLOWN OUT INSTRUMENT FOR BLASTING TO PREVENT FLOATING OF A BLASTING MEMBER DUE TO SUBSURFACE WATER IN A CHARGE HOLE

摘要

PURPOSE: An anti-blown out instrument for blasting is provided to prevent blown-out resulting from the deviation of a blasting member and to simplify the construction process.;CONSTITUTION: An anti-blown out instrument for blasting comprises a weight plumb(10), a guide piece(40), and supporting members(92a,92b). The weight plumb prevents a blasting member from floating in a charge hole. The guide piece is projected on the outer surface of the weight plumb. The supporting members are formed in the radial direction on the guide piece to be supported on the interior surface of the charge hole. The supporting member comprises a post installed to ascend and descend on the lower part of the guide piece and one or more support pieces fixed by a hinge to the post.;COPYRIGHT KIPO 2010