BREAKING OR SPLITTING OR FRACTURING OF ROCK

摘要

A rock breaking cartridge 10 holds liquid 42 in s fore tube 40 plugged bya plug 46 held by a pin 52. A rear tube 16 holds a propellant 18 behinda cap 30 checked by a pin 34. A gland 20, having an elongate passageand a diametrical hole, closes a rear of the tube 16. An initiatorassembly 58 has a fore plug body 24 and an initiator mounted behind theplug body. A pin 26.1 in the diametrical hole checks the plug body andseparates the initiator from the propellant. The pins 26.1, 34 and 52 areremoved and the cartridge is inserted in a hole in rock to be broken. Theinitiator is pushed into proximity to the propellent and the cartridge isforced down the hole. The liquid is forced out to surround the tube 16.The initiator is triggered electrically to initiate the propellant whichbreaksthe rock by sound waves propagated by the liquid. Prior to use, the plugbody checked in the gland renders the cartridge safe.