1. Construction preparation (1). Materials: main keel, connecting parts, hanging parts, spare parts (including suspenders, screws, nails, self-tapping screws, etc.), punched aluminum gusset plate. (2), operating conditions 1), after the installation of various pipelines and ventilation ducts in the ceiling, determine the location of lights, vents and various orifices. 2), all kinds of materials are matched and prepared. 3), set up a roof construction operation platform frame. Large-scale construction shall be carried out after trial installation of the roof camber, structural treatment of the opening of the lamp trough, block division and fixing method, etc. and confirmation by the construction unit and supervisor.