Truss Load: Can the Ceiling Support It?

Three parallel lighting trusses above the stage, each spanning 8 meters, suspended from embedded steel plates in the structural slab using steel cables and chain hoists. The suspension points are aligned with the original structural beams, not the center of the slab. Each truss holds eight to ten light fixtures, with a total weight of approximately 200 kg. Including a safety factor, the design load for the suspension points is indicated on a yellow label nearby. The trusses can be independently raised and lowered to a height of 1500mm for maintenance. Cables move with the truss via cable chains or reels. All metal parts are matte black. The scene is viewed from the audience area, looking up. Avoid: suspension points in the middle of the slab span, no load indication, light fixtures without safety cables, cables hanging directly without moving with the truss.

Translated from Chinese by AI.

舞台上方三道平行的燈光桁架,每道橫跨 8 公尺,由結構樓板上的預埋鋼板以鋼索與手拉葫蘆懸吊,吊點位置對齊原結構的樑而不是樓板中央。每道桁架上掛八到十盞燈具,總重約 200 公斤,加上安全係數,吊點的設計載重標示在旁邊的黃色標籤上。桁架可以獨立升降到 1500mm 高進行維修。電纜以電纜鏈或捲線器隨桁架升降。所有金屬件消光黑。畫面從觀眾區仰視。避免:吊點設在樓板跨中、沒有標示載重、燈具沒有安全鋼索、電纜直接垂掛不隨動。