| 摘要 |
PURPOSE:To improve the fireproofness, sound-insulating performance, and execution performance by arranging a sound-insulator on which a lead sheet glass cloth is attached, in a sound transmission passage. CONSTITUTION:A sound absorbing material 12 having a thickness of about 50mm is placed on a cradling receiving 11. Then, a sound insulating material 7 made of a lead sheet which is formed by the lamination of a glass cloth on the sound absorbing material 12. Then, the sound insulating material 7 is formed into U-figure form by the previous bending, and placed at the center part of the sound absorbing material 12, and skirt parts 7a are suspended to both the edge parts. Four sound insulating materials 7 are placed on the illumination equipment 5, and the joint part of the sheet of each sound insulating material 7 is superposed, and attached by a sound insulating adhesive tape, etc., made of lead, etc., so that no gap is generated. Further, a ceiling plate 4 is formed from a rock wool sound absorbing board 4a, and a sound absorbing material 4b made of glass cloth finishing glass wool is placed on the upper surface. Further, the upper edge of a partitioning wall 13 between chambers is joined with the undersurface of the ceiling plate 4. |
