초록 ▼

The present invention includes a small diameter explosive cartridge and a two-stage large diameter explosive cartridge apparatus for presplitting rock can be axially detonated by detonating cord through a central detonation passageway in the explosive cartridge while keeping the detonating cord and

The present invention includes a small diameter explosive cartridge and a two-stage large diameter explosive cartridge apparatus for presplitting rock can be axially detonated by detonating cord through a central detonation passageway in the explosive cartridge while keeping the detonating cord and the explosive material in the explosive cartridge physically separate. The explosive cartridge includes an outer tube and an inner tube inside of the outer tube. The explosive cartridge includes two or more continuous webs extending radially between the outer surface of the inner tube and the inner surface of the outer tube. For the small diameter explosive cartridge, the space between the outer surface of the inner tube and the inner surface of the outer tube is filled with high explosive material such as water gel or emulsion explosive material. The inside of the inner tube forms a central detonation passageway axially through the small diameter explosive cartridge through which detonating cord can be strung to provide axial detonation and to provide effective detonation between each of the small diameter explosive cartridges when the small diameter explosive cartridges are assembled on a line of detonating cord in a borehole, while keeping the detonating cord and the emulsion explosive material in the small diameter explosive cartridge physically separate. The two-stage large diameter explosive cartridge apparatus includes a large diameter explosive cartridge and a small diameter explosive cartridge.

대표청구항 ▼

[ What is claimed is:] [1.] An explosive cartridge for presplitting rock that can be axially detonated by detonating cord through a central detonation passageway in said explosive cartridge while keeping the detonating cord and the explosive material in said explosive cartridge physically separate,

[ What is claimed is:] [1.] An explosive cartridge for presplitting rock that can be axially detonated by detonating cord through a central detonation passageway in said explosive cartridge while keeping the detonating cord and the explosive material in said explosive cartridge physically separate, said explosive cartridge comprising:an outer tube having an inner surface and an outer surface;an inner tube inside of said outer tube, said inner tube having an inner surface and an outer surface;two or more continuous webs extending radially between said outer surface of said inner tube and said inner surface of said outer tube, said radial webs extending longitudinally along said inner tube and said outer tube; andthe space between said outer surface of said inner tube and said inner surface of said outer tube filled with explosive material;wherein the inside of said inner tube forms a central detonation passageway axially through said explosive cartridge through which detonating cord can be strung to provide axial detonation and to ensure detonation between explosive cartridges while keeping the detonating cord and said explosive material in said explosive cartridge physically separate.