Detonating cord and methods of making and using the same

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

Patent

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F42D 3/00 (2006.01) C06B 23/00 (2006.01) C06C 5/04 (2006.01) F42D 1/00 (2006.01) F42D 3/04 (2006.01)

Patent

CA 2410465

The velocity of detonation of an explosive such as detonating cord (18, 22) is controlled by the addition of a diluent to the explosive, e.g., to the core of the detonating cord (18, 22). An explosively inert diluent, or a diluent comprised of an explosive of lower brisance than the principal explosive comprising the core of the detonating cord, will serve to reduce the velocity of detonation. Such reduced velocity of detonation. Such reduced velocity of detonation has beneficial effects in certain operations, including cleaving rock (10), wherein it is observed to significantly reduce radial cracks (24) and stickers (26) (long radial cracks) in the vicinity of the boreholes (12) in which the low-velocity detonating cord (18, 22) is functioned to cleave the rock (10). The low-velocity detonating cord also facilitates leaving behind a smoother face in cutting trenches and tunnels through rock. The method of manufacture of low-velocity detonating cord includes incorporating a suitable diluent, such as phenolic microballoons, into an explosive core of, e.g. PETN.

La présente invention concerne un cordeau détonant (18, 22) dont la vitesse de détonation est régulée par l'adjonction d'un diluant à l'explosif, par exemple, dans l'âme du cordeau détonant (18, 22). Un diluant inerte au point de vue explosif, ou un diluant composé d'un explosif présentant une brisance moindre que celle de l'explosif principal comprenant l'âme du cordeau détonant, sert à réduire la vitesse de la détonation. Une telle réduction de la vitesse de détonation présente des effets avantageux dans certaines opérations, comme le clivage de roche (10), au cours duquel on constate une réduction significative des fentes radiales (24) et des craquelures (26) (longues fentes radiales) à proximité des trous de forage (12) dans lesquels le cordeau détonant (18, 22) à vitesse réduite est utilisé pour cliver la roche (10). Le cordeau détonant à vitesse réduite facilite également l'obtention de surfaces plus lisses lors du creusement de tranchées et de tunnels dans la roche. Le procédé de fabrication du cordeau détonant à vitesse réduite consiste à incorporer un diluant adéquat, tel que des microballons phénoliques, dans l'âme d'un explosif, comme par exemple, le tétranitropentaérythrite.

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