| 摘要 |
PROBLEM TO BE SOLVED: To easily demolish a housing of a replaced old acoustical panel and separately collect metallic materials obtained by the demolition for each type of metal without loss of the metallic materials.SOLUTION: In an acoustical panel 10 in which a plurality of bent metal plates are connected together by rivets 50 and assembled into a flat box-shape and a sound absorption material 14 is filled in the inside thereof, first rivet holes 40 are provided in one of a pair of metallic plates connected together by the rivets 50 and second rivet holes 44 and release holes 46 are provided in the other of the metallic plates. The pair of metallic plates are connected together by passing the rivets 50 through the first rivet holes 40 and the second rivet holes 44, the rivets 50 are moved from the second rivet holes 44 to the release holes 46 by making the pair of metallic plates mutually slide, the metallic plates connected by the rivets 50 are separated from each other by pulling out the rivets 50 from the release holes 46 and the first rivet holes 40, and thus the acoustical panel 10 is demolished. |
