Small charge blasting apparatus including device for sealing...

F - Mech Eng,Light,Heat,Weapons – 42 – D

Patent

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Details

F42D 1/22 (2006.01) E21C 37/12 (2006.01) E21C 37/14 (2006.01) F42B 3/22 (2006.01) F42D 3/00 (2006.01) F42D 3/04 (2006.01)

Patent

CA 2365680

A small charge blasting system provides relief volume (6) for a pressurized working fluid in bore (12) of barrel (4) that is inserted into hole (8) in the material to be broken. The working fluid is generated by cartridge (9) located in combustion chamber (3) of gas generator (1) and expands down bore (12) to exit muzzle (5) and pressurise hole bottom (10) to initiate and propagate a fracture. During hole pressurisation, the thin wall of muzzle (5) flexes outwardly and sealing band (7) forms a dynamic seal in hole (8) to impede leakage of the working fluid. Other constructions of barrel (4) are also disclosed and claimed and include an end cap on barrel (4) to inhibit the entry of water and detritus into bore (12), and a stepped downhole end barrel (4) to pressurise both the sidewall and bottom (10) of hole (8).

La présente invention concerne un système de dynamitage à charge réduite comprenant un volume (6) de décharge d'un fluide de travail sous pression dans l'alésage (12) d'un canon (4) introduit dans un trou (8) pratiqué dans la matière à dynamiter. Le fluide de travail est libéré par une cartouche (9) située dans la chambre de combustion (3) d'un générateur (1) de gaz et s'écoule vers le bas de l'alésage (12) en direction de la bouche (5) de sortie afin de mettre sous pression le fond (10) du trou et provoquer et propager une fracture. Lors de la mise sous pression du trou, la paroi mince de la bouche (5) fléchit vers l'extérieur et une bande (7) de blocage effectue un blocage dynamique du trou (8) pour empêcher une fuite du fluide de travail. L'invention concerne également d'autres types de canons (4) comprenant un couvercle d'extrémité du canon (4) destiné à empêcher de l'eau et des détritus de pénétrer dans l'alésage (12) et une extrémité de canon (4) à fond échelonné destiné à mettre sous pression la paroi latérale et le fond (10) du trou (8).

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