| 摘要 |
PROBLEM TO BE SOLVED: To provide technique, by which an optimum timing for stopping a vibrator used at a time when concrete is compacted can be determined. SOLUTION: In the concrete compaction equipment 10, the compaction equipment 10 has a vibrator 2 compacting placed concrete, a microphone 3 detecting the change of vibrations by the vibrator 2, a controller 4 outputting a timing signal for stopping the vibrator when a fixed sound-pressure changing pattern appears and a buzzer 5 sounding by the timing signal from the controller 4.
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