| 摘要 |
PROBLEM TO BE SOLVED: To simultaneously and effectively reduce a sound pressure level in the nearly whole band containing a low frequency band by providing a vibrationproof means and a resonance sound absorbing means on a ceiling slab made of a concrete slab and the like. SOLUTION: A ceiling plate 3 is fitted through a vibrationproof means 2 fixedly provided on a ceiling slab 1 made of a concrete slab and the like, and a resonance sound absorbing mechanism 4 is provided in an air layer which is a space not provided with the vibrationproof means 2 between the ceiling slab 1 and the ceiling plate 3. This vibrationproof means 2 is constituted of fitting jigs 21 fixedly provided on the ceiling slab 1, fitting jigs 22 fixing the ceiling plate 3, and shear type vibrationproof rubber 23 connecting together both fitting jigs 21, 22. As for the resonance sound absorbing mechanism 4, a resonator constituted of a main body part 31, a neck part 32, and an opening part 33 is used. Hereby, in the nearly whole band containing noise in a low frequency band to be exceedingly problems in heavy weight source floor impact sound, the sound pressure level can be simultaneously and effectively reduced. |
