METHOD FOR HOLE BLASTING Russian patent published in 2003 - IPC

FIELD: blasting operations, applicable for rock blasting in complicated conditions with employment both of electric and non- electric initiation. SUBSTANCE: the method consists in fulfilling of such operations as insulation of a blasting cartridge-detonator with elements of a hole blasting network in the bottom part of the hole charge, duplication of the hole blasting network, charging, wiring of the surface blasting network and blasting of the charges. The novelty in the method consists in operations of duplication and place of installation of the intermediate charge. Duplication is accomplished by connection of the cartridge-detonator to the surface blasting network with the aid of two signal conductors, whose primer means of initiation are placed in blind holes of one cartridge-detonator, and the cartridge-detonator is installed below the level of the bottom of the bench to be blasted - in the boring bit. EFFECT: enhanced efficiency of crushing of the body of rock at conducting of blasting operations in complicated conditions, enhanced safety of blasting operations, and reduced labor content in liquidation of failed hole charges, if any.