First of all, measured in two directions. Secondly, the steel quality of the steel tube column of the advertising screen can be checked. It is divided into uniformity, whether there are inter layers, cracks, non-metallic inclusions and significant segregation. When there is doubt about the quality of the steel, the safety of the structural members shall be ensured. Finally, check whether the steel pipe column is corroded and the quality of the steel structure protective coating. The quality of protective coatings for steel structures shall be tested in accordance with the relevant national equipment standards.
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