1. Component processing
Most of the billboard steel structures are connected by space truss, and the processing of its components is similar to that of the ordinary steel structure. The allowable errors of stocking, marking, drilling, cutting and correcting of the components are specified. The deviation after cleaning connection (welding or bolt) before assembly is also specified.
The steel tube of circular concrete-filled steel tube column is usually prefabricated in the factory. This kind of steel pipe can be made of seamless steel pipe or welded steel pipe. The steel pipe is also the same as ordinary steel structure, and its concrete pouring is usually carried out on the construction site.
2. Component assembly
The steel structure panel of billboard is used to display the contents and patterns of advertisements. It is the main windward force bearing surface, which is of great importance to the safe use. If the metal panel is used, the panel shall be firmly connected with the steel structure pipe rack according to the regulations, and the welding or bolt connection shall be adopted; if the film structure advertising picture is adopted, the connection of steel structure pipe support shall also meet the requirements of safe use.
The error range of component assembly is basically formulated according to the relevant contents of the current national standard code for acceptance of construction quality of steel structures (GB 50205).
3. Anti corrosion of components
The steel structure of billboard is used in the open air, so the anticorrosion of components is very important. The anticorrosion treatment includes hot dip galvanizing, hot spraying zinc aluminum composite coating, inorganic rich new coating and paint.
The first two kinds of hot dip galvanizing and hot spraying zinc are traditional anti-corrosion methods, while the latter two are applied at room temperature. The latter has the advantages of long anticorrosion period, convenient construction, low price and easy repair.
In addition, steel members can also be protected against corrosion by paint. The operation process and anti-corrosion life of paint shall be strictly controlled and implemented in accordance with relevant specifications.
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