Method and apparatus for small-charge blasting

E - Fixed Constructions – 21 – B

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E21B 7/00 (2006.01) E21C 37/12 (2006.01)

Patent

CA 2707341

The invention relates to a method of small-charge blasting as well as to a rock drilling unit and a front guide to be used therein. By means of a rock drill machine (6) provided in the rock drilling unit (4), a hole (15) is first drilled into a material to be excavated and, subsequently, a drilling tool (7) is pulled out of the hole. Next, one or more propellants (18) comprising a propellant charge are fed to the bottom of the hole through a propellant feed channel (13) provided in connection with a feed beam (5). Then, the hole is sealed and the propellant is ignited, whereupon a high gas pressure is generated, which causes fractioning in the material to be excavated. During the feeding and ignition of the propellant, the rock drill machine is kept in a parallel direction with respect to the hole.

Cette invention concerne un procédé d'abattage à petite charge ainsi qu'une unité de forage de roche et un guide frontal associé. Au moyen d'un perforateur mécanique (6) fourni dans l'unité de forage de roche (4), un trou (15) est d'abord foré dans un matériau à excaver et, par la suite, un outil de forage (7) est retiré du trou. Ensuite, au moins un gaz propulseur (18) comprenant une charge de propulsion est acheminé vers le fond du trou à travers un canal d'alimentation en gaz propulseur (13) agencé de manière à être raccordé à une poutre d'alimentation (5). Par la suite, le trou est scellé et le gaz propulseur est mis à feu, suite à quoi une pression gazeuse élevée est générée, ce qui entraîne le fractionnement du matériau à excaver. Pendant l'acheminement et la mise à feu du gaz propulsif, le perforateur mécanique est maintenu dans un sens parallèle par rapport au trou.

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