| 摘要 |
PURPOSE:To integrate a ceiling hanging beam with a ceiling joist to simultaneously simplify construction and save a joist material, to form an upper story underfloor soundproof board into a structure without a hole to enhance soundproof performance, and to integrate the ceiling hanging beam with the ceiling joist in such a manner that a lower edge of the beam is flush with a lower edge of the joist, so as to thereby easily secure a ceiling height and easily fit a ceiling board. CONSTITUTION:A plurality of ceiling hanging beams 13 of which both ends are supported are provided underneath of a soundproof board 11 equipped on an underfloor face of an upper story, a part of ceiling joists 14 are fitted to the hanging beams 13 to assemble the joists 14 together with the hanging beams 13 into a lattice shape, and a ceiling board 16 is fitted to the joists 14. A cutout 15 is provided in a lower edge of the beam 13 and an intersection part of the joist 14 with the beam 13 is fitted into the cutout 15. |
