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Method for blasting rock
T101301 Method for blasting rock
Patent Drawings:Drawing: T101301-2    Drawing: T101301-3    Drawing: T101301-4    Drawing: T101301-5    Drawing: T101301-6    
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(5 images)

Inventor: Persson, et al.
Date Issued: December 1, 1981
Application: 06/154,420
Filed: September 2, 1979
Inventors: Holmberg; Roger (S-140 41 Sorunda, SE)
Nord; Gunnar (S-191 44 Sollentuna, SE)
Persson; Per-Anders (S-117 48 Stockholm, SE)
Primary Examiner:
Assistant Examiner:
Attorney Or Agent:
U.S. Class: 102/308
Field Of Search:
International Class:
U.S Patent Documents:
Foreign Patent Documents:
Other References:

Abstract: Method of blasting rock to attain a predetermined fracture result. The necessary energy for the blasting is provided at an amount and in an application which is decided by calculating the stresses with regard to previously plotted blasting effects and to a previously prepared description of the rock structure.
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