English：

Leveraging the Shanxi Fenjiu Cultural and Business Center project, this paper conducted in⁃depth research into comprehensive construction technologies for large⁃scale steel structures in ultra⁃high⁃rise buildings, with the aim of overcoming challenges in the construction of complex steel structural jointsand improving construction precision and efficiency. By simulating the construction process using finiteelement software, this paper analyzed the stress conditions of steel joints, optimized the installationsequence, and achieved effective control over construction precision. Installation techniques for complexcomponents such as multi⁃cavity giant columns and transfer trusses were developed, and a 450⁃toncrawler crane was utilized for lifting operations to ensure the precise installation of large components.Regarding welding technology, research was conducted on on⁃site welding processes for high⁃strengththick steel plates. Numerical simulations were employed to analyze temperature fields and stressdistributions during welding, thereby optimizing welding sequences and construction process parameters tomitigate the effects of residual welding stresses.