Precautions for steel structure fabrication

What are the precautions and operation points of steel structure welding construction?

Welding deformation has great influence on construction quality. Therefore, measures should be taken to strictly control welding deformation during welding. According to the different thickness of plates, corresponding preheating measures and interlayer temperature control measures shall be taken. When multi pass welding is carried out, the welding slag and surface spatter shall be timely cleaned after each pass of welding. When defects affecting welding quality are found, they shall be removed before re welding.

During continuous welding, the base metal temperature in the welding area shall be controlled to ensure that the interlayer temperature meets the requirements. If the welding operation is interrupted under special circumstances, thermal insulation measures shall be taken. When welding again, it shall be preheated again and shall be higher than the initial preheating temperature. During welding, it is forbidden to strike arc on the base metal other than the weld.

After welding, the surface spatter, welding slag and welding seam shall be carefully removed. The weld shall be free of undercut, air hole, crack, weld and other defects, and the weld surface shall not be consistent with the geometric dimension. If the base metal is damaged, the surface of connecting plate and outgoing plate shall be smooth and flat after planing.

What are the preparations for the processing and production of steel structures?

1. Deeply understand the design drawings and relevant technical documents, and comprehensively review and proofread the structural construction drawings. Check the contents of the design drawings: whether the design documents are complete (design drawings, construction drawings, drawing descriptions, design changes), whether the component dimensions are complete and correct, whether the nodes are clear, whether the component connection form is reasonable, whether the welding symbols are complete and reasonable, and whether the rationality and process of the structure are timely contacted and discussed with the design unit.

2. Detailed design and detailed construction drawings: carry out detailed design of construction drawings according to the construction drawings of the Design Institute, closely cooperate with the design institute to carry out detailed design of nodes and draw detailed construction drawings.

3. Drawing preparation and preparation process: prepare process documents, prepare all construction drawings and process documents for production release; And formulate detailed drawings, code for construction quality acceptance of steel structure engineering and other standards and the company's quality system document DW / - 2 steel structure production and installation process specification to prepare the production process and quality standards of steel members for the project.

Note: when transporting steel members, vehicles shall be selected according to the length and weight of steel members. The fulcrum of steel members on the vehicle, the protruding length of both ends and the binding method shall ensure that the members do not deform or damage the coating.

Installation: the steel structure shall be installed according to the design of the construction organization. The installation procedure must ensure the stability of the structure without causing deformation. When installing the column, the positioning shaft of each column must be directly led out from the ground control shaft. After the installation of the columns, beams, roof trusses and other main components of the steel structure, they must be corrected and fixed immediately.