Pit & Quarry, May 2018
DRILLING BLASTING Rhythmic Timing Practices Proper design and critical timing functions should be incorporated into your method to deliver better blast results BY ANTHONY KONYA AND CALVIN J KONYA T Putting a delay 26 PIT QUARRY May 2018 pitandquarry com ISTOCK COM HSVRS raditionally blast timing utilized two separate timing sequences to allow for proper breakage of rock piling of material and minimization of ground vibration and air overpressure These timing sequences included the timing from one hole to another that are in the same row and timing from one hole to another These timing practices were typically labeled like a 17 42 meaning each hole in a row would fire 17 milliseconds after the previous and each row would start firing 42 milliseconds after the previous row CONCEPTS TO GRASP The first topic along these lines to understand is hole to hole timing basics Firing all the holes at the same time instantaneously would actually result in significant boulders and very poor breakage yet it would throw and scatter the material more In addition instantaneous firing would allow for larger spacing which would reduce drill and blast costs but increase fragmentation size between boreholes actually increases the fragmentation of the blast but does not throw the material as far
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