1. The bolt hole is not right: it is not allowed to expand or change to welding arbitrarily. If the above problems are found during installation, the technical person in charge should be reported. After consulting with the design unit, the bolt hole should be handled according to the requirements.
2. Welding quality on site can not meet the design and specification requirements: welders must have qualification certificate, and should be numbered. Welding parts should be inspected and recorded according to numbering. All welds have been inspected by appearance. Where the required parts are not reached, they should be re-inspected after repair welding.
3. Install high-strength bolts directly without using installation bolts. Installation must be temporarily fixed with installation bolts according to specifications. After adjusting and tightening, install high-strength bolts and replace them.
4. roof truss support connection structure does not meet the design requirements: when steel roof truss is installed for final comprehensive inspection and acceptance, if the support structure does not meet the design requirements, the acceptance formalities shall not be processed.