Patent ID: 6321655
Filing Date: 2001-11-27
Classification: F42D

Abstract:
A method for selecting one or more flyrock control devices for use in a small-charge blast in which a material is broken by a pressurized working fluid released into or generated in a hole in the material and sealed in the hole by a sealing member positioned in the hole, the material being near an area that is subject to flyrock restrictions, the method comprising:(a) determining at least two of a job, personnel, and machine flyrock distance requirements for the material to be broken;(b) determining an uncontrolled flyrock distance produced by the small-charge blast in the absence of a flyrock control device, the flyrock being generated during the propagation and initiation of a fracture from the hole;(c) comparing the at least two of a job, personnel, and machine flyrock distance requirements with the uncontrolled flyrock distance to determine whether flyrock control is needed;(d) when the uncontrolled flyrock distance of step (b) is more than the at least two of a job, personal and machine flyrock distance requirement of step (a), selecting one or more flyrock control devices from among a plurality of flyrock control devices to produce a desired degree of flyrock control.