CONTINUOUS EXPLOSIVE CHARGE ASSEMBLY AND METHOD FOR LOADING SAME IN AN ELONGATED CAVITY

摘要

A method and apparatus for placement of continuous pre-split, gelexplosive in an elongated borehole or cavity. An anchor is attached to one endof aselected length of continuous -gel explosive. A suitable anchor is a flexible,plastic"pilgrim's hat" with a hole in the narrow, closed end. The size of the anchordepends onthe width of the borehole; the flared skirt should be narrow enough to permitinsertion ofthe anchor into the hole but wide enough to resist removal. One end of theexplosivecharge is pressed through the hole in the anchor. The remainder of the lengthofexplosive is placed inside a tubular member, such as PVC pipe. The loaded pipethen isinserted into the borehole or cavity with the anchor leading. The pipe is usedto push theanchor back into the hole to the desired depth. Then, the pipe is withdrawn.The flexibleskirt on the anchor engages the sidewall of the borehole and thus resistsremoval with thepipe. As the pipe is pulled out of the borehole, the explosive charge is leftbehind in asubstantially linear arrangement. The explosive is detonated in a conventionalmanner.