Drillhole blasting

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

Patent

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Details

F42D 1/08 (2006.01) E21C 37/16 (2006.01) F42D 1/00 (2006.01) F42D 3/00 (2006.01) F42D 3/04 (2006.01)

Patent

CA 2429447

A blasting arrangement (10) includes drillholes (30) in a rock mass (20). Blind ends (32) are drilled to a desired level and, if necessary, are adjusted as shown at (62) to said level. Each hole (30) is plugged by means of a plug (42), which is protected by non flammable buffer material (44), at a level (40) spaced from the end (32). Explosive (50) is charged above the level (40) and the hole is tamped, shown at (60). The holes are detonated desirably by detonators (52), forcing the plugs (42) downwardly and compressing air in chambers (34) above the ends (32). The weakest part of each hole, around the end (32), is split causing a three dimensional zone of weakness at the level of the ends (32). Air forced into the zone of weakness causes a fracture zone (70) at that level, inhibiting propagation of blasting shock waves and protecting the material underneath the level of the ends (32).

L'invention concerne un dispositif de dynamitage (10) qui comprend des trous de mine (30) dans une masse rocheuse (20). Des extrémités fermées (32) sont percées à un niveau souhaité et, si nécessaire, sont ajustées audit niveau, comme dans l'illustation (62). Chaque trou (30) est bouché au moyen d'un bouchon (42) protégé par un matériau tampon ininflammable (44) à un niveau (40) espacé de l'extrémité (32). Un explosif (50) est chargé au-dessus du niveau (40) et le trou est bourré (illustration 60). Les trous sont détonés de manière souhaitable par des détonateurs (52), sollicitant les bouchons (42) vers le bas et comprimant l'air dans des chambres (34) au-dessus des extrémités (32). La partie la plus faible de chaque trou, autour de l'extrémité (32), est fendue entraînant une zone de faiblesse tridimensionnelle au niveau des extrémités (32). L'air pulsé dans la zone de faiblesse crée une zone de fracture (70) à ce niveau, ce qui empêche la propagation des ondes de choc de dynamitage et protège la matière au-dessous du niveau des extrémités (32).

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