BLASTING METHODS USING ELECTRONIC DETONATOR, ELECTRIC DETONATOR, ELECTRONIC BLASTING MACHINE AND MULTIPLE STEP BLASTING MACHINE

摘要

PURPOSE: A blasting method using an electronic detonator, an electric detonator, an electronic blaster, and a sequential blaster is provided to minimize noise and vibration by applying the optimum delay time according to the characteristic of rock and ambient conditions. CONSTITUTION: A blasting method comprises the steps of: boring a cut hole on the breast of a tunnel, boring an expanded cut hole around the cut hole, respectively setting an explosive and a blasting cap in the cut hole and the expanded cut hole, electrically connecting the blasting cap to each circuit of a circuit terminal board, and electrically connecting the circuit to a sequential blaster. The breast of the tunnel is composed of a plurality of regions. An electronic blasting cap is installed in the cut hole and an electric blasting cap is installed in the expanded cut hole. The electronic blasting cap is continuously detonated at pre-inputted delay time and the electric blasting cap is detonated with its own delay time and circuit's delay time.