| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor structure which can improve sound insulation performance while maintaining a framed structure comprised of a frame material and a beam shape made of a metal shapes. SOLUTION: A granule 13 such as reduced pellets is encapsulated in a space part 11 of the beam member 3 made of metal shape. Then the framed structure, which is comprised of the frame material and the beam material 3, is constructed. COPYRIGHT: (C)2006,JPO&NCIPI
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