| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor structure capable of effectively decreasing heavy floor impact noises when installing dynamic dampers to floor joists which are made of C-type steel for supporting the floor. SOLUTION: First and second dynamic dampers D1 and D2 are installed in such a manner that they are combined together each other for first to sixth floor joists 11 to 16 made of C-type steel for supporting the floor as described below. The dampers are installed in a row at a central position in a longitudinal direction for each of the first to sixth floor joists 11 to 16. However, two of the second and fifth floor joists 12 and 15, which are located the closest to the positions separated by a distance equal to one-quarter of a distance between two beams 1b and 2d located at both outer sides in a direction parallel to those of the first to sixth floor joists 11 to 16, respectively have the dampers at 3 places in their longitudinal directions. COPYRIGHT: (C)2007,JPO&INPIT
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