Aluminum ceilings generally do not deform. If the wooden keel ceiling gusset plate is used, the loose skeleton may be sucked away by moisture. In addition, this can happen when the ceiling is too heavy. When aluminum alloy ceiling is used, the main keel should be hung on the hanger. The main keel spacing is 900 ~1000 mm. Light steel keel and t-shaped keel. Keels can be used for uc50 and uc38. Keel keel main keel shall be installed in parallel with the room length, and the arch height and room span shall be 1/200 ~ 1/300. The main keel of cantilever beam should be less than 300mm, otherwise it should be increased. The long boom shall be mainly connected with the keel, and the keel shall be staggered with the adjacent joints. Hanging keel should be basically flat. For the main keel whose span exceeds15m, a large vertical keel shall be added every1500m to weld with the main keel. Solid. If the ceiling is large, the molded part should be welded on the frame, angle steel or flat steel and firmly connected with the floor.