Abstract：
In a roof engineering design of a cinema, grid structure is used to support the profiled sheets and sound insulation suspended ceiling is adopted in the cavity layer of the grid roof. 8 layers of 12mm-thick thistle boards and 2 layers of glass wool boards are used to for a 650mm cavity layer in the middle. Equipment pipelines pass through the upper, middle and lower parts of the cavity layer, producing many cross constructions, complex construction processes and high construction difficulties. After feasibility analysis of the construction and design schemes, a suspension point string connection method is adopted by setting channel steel at the lower camber transition layer of the grid and designing the details of each suspension point, and technical difficulties in sound insulation layer construction are successfully overcame.
