| 摘要 |
PROBLEM TO BE SOLVED: To obtain a floor structure which properly exerts the performance of insulating a floor impact sound, and improves constructibility. SOLUTION: When vibration is applied to an upper flooring material 14, a cushion pedestal 26 is elastically deformed, and a mass body 28 moves upward and downward in such a manner as to absorb the vibration so as to damp the vibration from the flooring material 14. The damped vibration is further damped by cushion rubber 18 and transmitted to a floor slab 12. In this case, the floor impact sound is properly insulated by making the mass m of a dynamic damper 25 satisfy an expression: M×(1/15)≤m≤M×2.5. In the expression, m represents the mass of the dynamic damper 25; and M represents a value which is obtained by dividing the total of a masses-per-unit-area of the flooring material 14, a supporting bolt 22 and the cushion rubber 18 by the number of supporting points per unit area, supporting the dynamic damper 25. Additionally, favorable constructibility can be obtained because a vibration control material or a sound insulating material is not necessary to be arranged all over the floor as ever in construction. COPYRIGHT: (C)2007,JPO&INPIT
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