Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting
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United States of America Patent
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Sep 8, 1998
Grant Date -
N/A
app pub date -
Aug 7, 1996
filing date -
Aug 7, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to a method for breaking rock and other hard materials using small-charge blasting techniques followed by a mechanical impact breaker. In small-charge blasting techniques, a gas is released into the bottom of a sealed hole located in a free surface of the hard material. The gas pressure rises rapidly in the hole until the gas pressure causes the hard material to fracture. The impact breaker is then used to complete fracturing of the material and to remove the fractured material.
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