(1) Installation requirements of wooden keel ① Material: the wood is required to be free from quality defects such as splitting, corrosion, insect frogs and dead joints; The specification is that the section is 30 ~ 40mm long and 40 ~ 50mm wide, and the water content is lower than 10%. (2) Design: caisson ceiling is adopted. If the height difference is greater than 300mm, it should be handled step by step. The keel structure must be firm, and the spacing between large keels shall not be greater than 500mm. The keel must be fixed firmly, and the keel frame must have fixed parts at the top and wall. ③ Construction: The horizontal deviation of ceiling elevation is not more than 5 mm.. The bottom surface of wooden keel should be planed and leveled, and the cross section thickness should be consistent, and flame retardant treatment should be carried out.

(2) wooden keel installation specification:

A. First of all, pop up the elevation line, modeling position line, lifting point layout line and lamp installation position line.

B. There are two ways to fix the lifting point at the top of the dragon skeleton: one is to fix the angle iron or flat iron directly at the top with nails with a diameter of more than 5 mm, and the other is to drill holes at the top and fix the iron sheet or wood square with expansion bolts as the lifting point. Ensure that the lifting point is firm and safe.

C. After the dragon skeleton is installed, quality inspection and acceptance shall be carried out before the decorative board can be installed.

(3) Installation of decorative plates

A. There are two main types of ceiling decorative boards: gypsum board and wood board, both of which require smooth surface, no unevenness, no fracture and neat edges and corners.

B. The installation methods of decorative boards mainly include round nail fixing method and wood screw fixing method, among which round nail fixing method is mainly used for the installation of wood decorative boards, with fast construction speed; Screw fixation method is mainly used for plasterboard veneer to improve the nail holding ability of the board.

C. Installed decorative boards should be completely consistent with the wall surface, with decorative corner lines to leave gaps, and the joints between decorative boards should be tight.

D. When the ceiling is suspended, the position of the lamp mouth should be reserved when installing the decorative board. After the panel is installed, the finishing work needs to be completed. Commonly used materials are latex paint and wallpaper, and the construction method is the same as that of wall construction.