Blasting device

E - Fixed Constructions – 21 – C

Patent

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Details

E21C 37/14 (2006.01)

Patent

CA 2264812

A compressed air blasting device (1), insertable in a pre-prepared bore, has a cylindrical housing or tube (2) containing a number of air guns (4). Apertures (3) in the housing (2) direct the flow of compressed air exhausted by the air guns (4) so as to produce a build-up of pressure sufficient to weaken and displace material from the area surrounding the bore. The further enhance the effect of the device (1), the bore may be filled with water and sealed with a packer (11) mounted on the device (1) prior to blasting.

Dispositif d'abattage à air comprimé (1) pouvant être inséré dans un trou déjà préparé et constitué d'un corps cylindrique ou tube (2) renfermant un certain nombre de canons pneumatiques (4). Des ouvertures (3) ménagées dans le corps (2) dirigent l'écoulement d'air comprimé provenant des canons pneumatiques (4) de façon à établir une pression suffisante pour amollir et déplacer le matériau de la surface entourant le trou. Afin d'accroître également l'effet du dispositif (1), le trou peut être rempli d'eau et fermé hermétiquement par une garniture d'étanchéité (11) fixée sur le dispositif avant l'abattage.

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