| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a blasting construction method capable of reducing vibrations generated on a predetermined spot on the surrounding in accordance with blasting even when a position of a blasting object area is changed.SOLUTION: A dominant frequency at predetermined spots P1, P2 of vibrations transmitted between a working place A and the predetermined spots P1, P2 are determined beforehand and stepwise blasting of the working place A is performed according to the difference of blasting second at which a peak frequency different from the dominant frequency is generated. The dominant frequency at the predetermined spots P1, P2 is measured in such a state that the positional relationship between the working place A and the predetermined spots P1, P2 is determined and, therefore, even when the position of the working place A is changed, the dominant frequency can be precisely measured under distance or ground conditions in accordance with the positional relationship. Accordingly, resonance between the peak frequency produced by the difference of blasting second when performing the stepwise blasting of the working place A and the dominant frequency on the predetermined spots P1, P2 is avoided and vibrations generated on the predetermined spots P1, P2 are reduced.</p> |
