METHOD FOR INITIATION OF BLAST UNIT DEEP-HOLE CHARGES Russian patent published in 2001 - IPC

FIELD: mining industry, applicable for blasting of rocks at exploitation of mineral resources or construction of objects of various designation. SUBSTANCE: the method consists in placement of a detonating cord of the main and duplicating networks in the charge hole and in the lines along series of charges of multi-row short-delay blasting with a subsequent feed of the initial impulse through the detonating cord, prior to placement, the detonating cord of the main and duplicating networks get twisted. The turning pitch of two threads of the detonating cord is within 0.5 to 0.25 m. EFFECT: enhanced power and reliability of transmission of the initiating impulse to the deep-hole charges, reduced quantity of their failures and enhanced efficiency of rock blasting. 1 tbl, 2 ex