METHOD FOR INSTALLATION OF BLASTING NETWORK FOR CRUSHING OF DIFFICULTY EXPLOITABLE ROCKS Russian patent published in 2000 - IPC

FIELD: blasting operations, in particular, methods for blasting, applicable for crushing of rocks at extraction of mineral resources, construction, digging of trenches and foundation ditches. SUBSTANCE: method consists in drilling of bore-holes with the use of a multiple grid, installation of the blasting network with the use of detonating cord, detonation by detonating cap. The difference is in the fact that the live primers of deep-hole charges are connected by detonating cord in groups of four pieces with detonation from one central point formed by the group detonating cords, and the group central points are connected in pairs by detonating cord into subgroups, and detonating cap is connected to the middle of the detonating cord between the subgroups, the network is installed in such a manner that the overall length of the detonating cord sections of each live primer to the detonating cap would be the same, with the allowable error not exceeding 50 mm. Besides, the subgroup blasting network may be connected via a retarder to the main detonating cord with the detonating cap. EFFECT: enhanced degree of crushing. 2 cl, 3 dwg