The steel structure pre assembly site should be flat and reliable. The pre assembly fixed support should be checked for strength and stiffness. The accuracy of each support plate point can be measured and adjusted point by point with a measuring instrument. The fixed supports of counterweight and large trusses need to be checked, and the pre assembly jig frame of small prefabricated components can be determined according to the work experience of blue engineer. According to the type of prefabricated components of the pre assembly unit, the pre assembly support pad can be steel platform, support bench, section steel, etc.
1. Precise measurement points and elevation lines shall be set for steel structure pre assembly.
2. If necessary, temporary connecting plates can be set for steel prefabricated members before pre assembly.
3. The pre assembly sequence and assembly unit of steel structure components should be clear according to the design regulations and construction methods. Generally, the main prefabricated components are first attacked and then the prefabricated components. The steel beam of the portal steel frame shall be erected and assembled first, and then assembled with the steel column on the plan after correction.
4. After pre assembly and passing the system self inspection, the supervision unit shall be invited to carry out project acceptance and make quality records
That's all for today's content. After the steel structure passes the pre assembly inspection, it should be marked with the middle * line, the control benchmark and other signs, and the locator should be set accordingly if necessary.
