LENGTHENED CHARGE BY PIN-POINT DESTRUCTION OF ROCKS BY BLAST Russian patent published in 2003 - IPC

FIELD: mining industry, in particular drilling and blasting operations, applicable at driving of mine working or breaking of rock mass with the aid of a pin-point blast. SUBSTANCE: the lengthened charge consists of separate containers-cartridges made in the form of cylinder-shaped shell with a longitudinal cumulative recess, cover with an end cumulative recess that is opposite the cover of the end bulge of the shell repeating the shape of its end cumulative recess and positioned in the shell of the explosive charge, according to the invention, a recess is made in the cylindrical part of the cartridge shell in the form of a tapered cumulative cavity conjugate to the longitudinal cumulative recess and directed towards the cover with the end cumulative recess. EFFECT: produced a lengthened charge for pin-point destruction of rocks with a reliable blast of the charge over the entire length and improved completeness of breaking of the rock mass. 4 dwg