BULLET PERFORATOR AND METHOD OF ITS USE Russian patent published in 1994 - IPC

FIELD: mining. SUBSTANCE: bullet perforator has a gun powder chamber with two powder charges and a blasting device with a fuse, located between the charges. One butt of the powder chamber joins a head section with a barrel and a joint of the barrel cutting sealing. Its other butt joins a bullets section, an ending section with a tip, bullets, pieces of ammunition and sealing, an electric igniter. Bullets sections of the perforator has two barrels, facing each other, with their barrels cuttings joined by vertical. The powder chambers with individual electric igniters are placed between the bullets sections and have individual connections with a combat electric circuit. The bullet perforator barrels cuttings of each bullets section are oriented in one direction. To make terms to create system of horizontal cracks the barrel cuttings of each bullet section are oriented in opposite directions. In case there is necessity to create terms for formation of mixed groups of the sections, mixed groups of bullets sections are used. Before perforator assembly one should take into consideration geological structure in zone of perforation and should determine main directions of cracks system development in stratum in relation to its footing and roof, frequency of perforation, required number and type of bullet sections, a step of motion, and after perforator is lowered, - take into consideration tasks to be settled, exercise firing of all bullet sections simultaneously or by paired charges sections. EFFECT: perforator and method are effective in opening productive beds of natural resources. 5 cl, 4 dwg