E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
E21C 41/16 (2006.01) E21B 7/00 (2006.01) E21C 37/16 (2006.01) E21D 9/00 (2006.01) F42D 1/00 (2006.01) F42D 3/04 (2006.01)
Patent
CA 2153292
The present invention relates to a method for forming a parallel bore hole and a slant bore hole (or V-shaped V bore hole) together within the same area of a working face, and then blasting the working face by using a delay electric detonator. The method of this invention includes the steps of drilling a number of slant holes by a predetermined angle in the horizon- tal angle cut pattern or in the vertical angle cut pattern about the central zone of a working face, drilling a number of parallel cut holes within a projective area of the above mentioned slant holes; loading an electric detonator in the slant holes and an explosive material by indirect priming in the parallel cut hole up to the bottom of the slant holes; blasting the slant holes to form a slant free surface; blasting a center cut hole out of the parallel cut holes to form two free surfaces having a funnel shape; and sequntially blasting a middle cut hole and an outer cut hole out of the parallel cut holes to form a cubical space, and as a result, the drilling is achieved easily, the drilling time is reduced, the necessary quantity of explosives is low, and the blasting efficiency is high.
Kim Myongkyu
Yoon Yeongjae
Bcf Llp
Sunkyong Engineering & Construction Limited
LandOfFree
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