| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of determining soundness capable of determining simply the soundness. SOLUTION: A worker 23 constrains the upper end of a utility pole 2 by a constraining part 7 by using a vehicle for high lift work, and strikes by using a hammer 23 in the both-end fixed state. A measuring computer 19 determines a Fourier spectrum and a phase difference spectrum from a vibration waveform measured by a speed meter 15, measures the characteristic frequency of the Fourier spectrum, and determines a soundness index which is a value determined by dividing the characteristic frequency by a standard characteristic frequency. The measuring computer 19 determines that the utility pole 2 is in an unsound state when the soundness index is below a fixed value, and determines that the utility pole 2 is in the sound state when the soundness index is over the fixed value. COPYRIGHT: (C)2006,JPO&NCIPI
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