8 高張力ボルト摩擦接合工法に於ける騒音について

概要

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High-tensile bolt joint has commonly used as a new steel construction joint in site. The new technique is said to be useful for noise reduction at the building fields in the city center. This report, one of our studies on the noise control at the constructing site, compares noise by high-tensile bolt joint with the one by convensional rivetting work. Measured noise level, frequency analysis of produced sound and durable time of noise are discussed in detail. Summing up the results, (1) Usually 80 phon noise is remarkable in ordinary construction work, but it increases up to 105-108 phon, 25〜28 phon larger, during rivetting work (distance 5m). (2) 80 phon noise is caused in common building work, while 98-99 phone noise, 18-19 phon large, is produced during impact-wrench is used (distance 5m). (3) Comparing with rivetting work, noise is lower by about 10 phon when the impact-wrench is used. (4) In rivetting work, it takes 13-26 seconds to clinch one rivet. (5) When impact-wrench is used, the time to finish one bolt is only 1.4-2.0 seconds and not more than 10 seconds to complete three bolts. Consequently noise by the high-tensile bolt joint which uses impact-wrench is lower, and operating time is shorter than the case of rivetting work. And the "loudness" which affected by the time factor is much less. After all, the high-tensile bolt joint is superior to the conventional rivetting work in view of noise control.
1960-03-25