| 摘要 |
PROBLEM TO BE SOLVED: To enhance efficiency of blasting operation while suppressing cost.SOLUTION: In a blasting method, a cutting face is set to form a core cut part 4 and a plurality of divided easer-shot parts. The core cut part 4 is blasted through single-hole and single-stage blasting, by using electronic detonators 14 whose time setting of delay time is set at the site. The plurality of divided easer-shot parts are blasted through single-hole and single-stage blasting by using detonators 20 with fuse tubes. The delay time of the plurality of electronic detonators 14, the delay time of a plurality of ignition detonators 16, the delay time of a plurality of connection detonators 18, and the delay time of the plurality of detonators 20 with fuse tubes are set so as to satisfy the conditions such that: after finishing ignition of all of the plurality of detonators 20 with fuse tubes, priming of the plurality of electronic detonators 14 are started; after finishing blasting of the core cut part 4, blasting of each of the divided easer-shot parts 6A to 6E is started; and all of the plurality of detonators 20 with fuse tubes are ignited at different time from each other.SELECTED DRAWING: Figure 4 |
