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Anti-seepage: Prevent rainwater from seeping into the metal roof panel from outside. Rainwater enters the metal roof mainly through lap joints or nodes. In order to achieve the function of anti-seepage, it is necessary to use a sealing washer in the screw port and adopt a hidden fixation. Use sealant or welding at the overlap of the board. It is best to use a long board to eliminate the overlap. Tight waterproof treatment for abdominal distension.

Under policy control, the steel market price continued to adjust. On May 27, the Steel Index price was 5,449 yuan/ton, a decrease of 1,205 yuan/ton or 18.1% from the 13th high. In terms of specific varieties, the average price of rebar in the top ten cities was 4,933 yuan/ton, and the higher point fell by 1303 yuan/ton, a decrease of 20.9%; the average price of hot-rolled coils in the top ten cities was 5265 yuan/ton, and the higher point fell by 1,400 yuan. /Ton, a decrease of 21.0%.

1)When the component is blanked, a shrinkage margin should be reserved, and the welding shrinkage and compression deformation should be coordinated with the shrinkage deformation of the steel under negative temperature

There are three kinds of connection methods of steel structure: weld connection, bolt connection and rivet connection.

Light steel structure plant is a new structural form developed on the basis of common steel structure, which includes all the steel structures used under the light roof. 

Due to the poor fire resistance of steel structure, it will quickly fail and collapse under the action of high temperature in the fire. The fire resistance limit is only 15 minutes. If measures are taken to protect the steel structure, the temperature rise does not exceed the critical temperature during fire. In principle, the protection measures taken for the steel structure can be divided into two types: the closure method and the dredging method.