Method of breaking slabs and blocks of rock from rock...

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

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Details

F42D 1/28 (2006.01) F42D 1/08 (2006.01) F42D 3/04 (2006.01)

Patent

CA 2242871

Rock slabs (10) or pieces (17) are broken from large rocks (10) or from rock formations (11) with reduced cracking of the broken rock slabs or pieces by drilling bore holes (13, 14, 15, 16) along the desired break lines, placing detonating cord (20) into the bore holes, filling the bore holes with a shock transmitting and moderating composition (21), and detonating the detonating cord (20). The shock transmitting and moderating composition (21) is preferably a gel with shock absorbing material (22) such as microspheres or micro gas bubbles suspended therein. Openings in rock can also be formed by drilling at least one bore hole within the desired opening and drilling a plurality of bore holes along the desired periphery of the desired opening. Explosives within the at least one bore hole within the desired opening is detonated to break rock within the opening and detonating cord (20) in the bore holes along the desired periphery of the desired opening which holes are filled with a shock transmitting and moderating composition (21) is detonated to break the rock inwardly of the desired periphery while leaving stable the rock outwardly of the periphery.

On détache des dalles ou blocs rocheux (10, 17) de rochers plus importants (10) ou de formations rocheuses (11), en réduisant la fissuration des dalles ou blocs rompus, par percement de trous de sonde (13, 14, 15, 16) le long des lignes de rupture voulues, mise en place d'un cordon détonant de mineur (20) dans lesdits trous, lesquels sont ensuite remplis d'une composition pour transmission et modération d'énergie explosive (21) et, enfin, amorçage du cordon détonant (20). Ladite composition (21) est de préférence un gel à matériau absorbeur d'énergie (22), du type microsphères ou microbulles de gaz en suspension dans le matériau. On peut aussi réaliser des ouvertures dans le rocher en perçant au mois un trou de sonde à l'endroit de l'ouverture souhaitée et en perçant une pluralité de trous de sonde le long du pourtour de l'ouverture souhaitée. On amorce les explosifs placés dans le trou percé à l'endroit voulu, pour rompre le rocher dans l'ouverture, et le cordon détonant de mineur (20) mis en place dans les trous de sonde percés sur le pourtour de l'ouverture souhaitée et remplis de la composition susmentionnée (21) est amorcé pour rompre le rocher à l'intérieur du pourtour en question, sans ébranler la stabilité du rocher à l'extérieur dudit pourtour.

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