（1） Fabrication of steel members Steel structure fabrication includes deepening, setting out, marking, cutting, welding, correction, and other links. The anti-slip coefficient of the friction surface after high-strength bolt treatment shall meet the requirements. Shot blasting and spraying shall be carried out after the production is completed and the quality is qualified. The level of shot blasting and coating thickness must also meet the requirements of the drawing. Generally, 30~50mm shall be reserved at the installation weld for the time being.