1, Project Overview
A commercial steel structure building project, 3 floors underground, 2 floors above ground. According to the design requirements, the skylight ceiling steel structure is used in the top of the second floor, and the low-E glass dome steel structure is used over the shape to meet the use function and beautiful effect. There are three domes in total: the main skeleton of the big dome is semi-oval, the long axis is 36.094 m, the short axis is 11.5 m, and the height of the whole structure is 3.6 m; The total height of the two domes is 2.4 m.
2, The characteristics and difficulties of the project
After the dome steel structure frame is installed, the installation of glass becomes the key. Because the size of each glass is different, it is necessary to make a lofting mold on site one by one, and there are many connecting nodes. Each mold has to be verified by number to ensure the accuracy of the dome's geometric size.
3, Scope of application
The structure system is suitable for building lobby, hollow and other tall space or transfer layer of special-shaped glass dome building construction.
4, technical principle
The connection position of each node of glass dome roofis controlled by the positioning of the line, and the special glass mold of different specifications is made according to the shape of each base. After being customized by the glass manufacturer, it is installed after numbering. This technology not only reduces the error of glass and glass splicing, but also greatly improves the tightness of glass assembly.
5, construction technology process
1) After receiving the glass on site, the glass will be lifted to the roof by crane, and installed to each corresponding position according to the glass number;
2) the glass is installed with glass tape holder, weatherproof structural adhesive sealing glass gap;
3) Thermal insulation cotton is used for thermal insulation around the arc, and granite British brownstone is used to seal the arc edge out of the edge and glue treatment;
4) The arc glass edge is covered with 60 × 50 × 60 slot black stainless steel;
5) The edge closing frame is welded with 40 × 20 × 3 flat steel around the original steel frame, and the edge is wrapped with woodworking board and aluminum plastic board.
