| 摘要 |
PROBLEM TO BE SOLVED: To obtain a soundproof floor structure capable of considerably reducing heavy floor impact noise. SOLUTION: This soundproof floor structure 1 is provided with beams 2, a floor common joist 3 on the beams 2, and a floor board 4 on the floor common joist 3 to reduce heavy floor impact noise. In the floor structure 1, the floor common joist 3 is provided with a common joist 3a and metal plate-shaped body 3b. The common joist 3 is a narrow square timber and arranged in parallel with the length of the floorboard 4. Both longitudinal end parts of the common joist 3a are supported by the beams 2, and at least either the front or back surface of the plate-shaped body 3b is joined to the longitudinal side surface of the common joist 3a.
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