1. Steel structure production and installation in winter construction in strict accordance with the relevant steel structure winter construction regulations
       2. When the positive temperature of steel components is made and the negative temperature is installed, the shrinkage of components should be considered according to the difference of the ambient temperature, and the technical measures to adjust the deviation should be taken in the construction.
       3. Welders who participate in the construction of negative temperature steel structure shall be trained in negative temperature welding technology, pass the examination, and obtain the corresponding certificate of qualification.
       4. The steel and related connecting materials used under negative temperature shall be accompanied by a quality book, and the performance shall meet the requirements of design and product standards.
       5. The electrode used in negative temperature shall not be exposed for more than 2 hours. After 2 hours, the electrode shall be re-baked.
       6. The flux shall be baked according to the regulations before use, so that its moisture content does not exceed 0.1 %.
       7. High strength bolts used at negative temperature shall have product qualification certificate, and recheck torque coefficient and axial force at negative temperature.
       8. Water coating shall not be used in the coating of steel structure under negative temperature.
       9. Shrinkage allowance should be reserved when members are blanking, and the amount of welding shrinkage and compression deformation should be coordinated with the amount of shrinkage deformation produced by steel under negative temperature.
       10. When assembling components, extend the assembly from the inside out according to the sequence specified in the process, and make tests at negative temperature to determine the shrinkage value of welding seams that need to be reserved.