超高层大悬挑钢桁架空中平台工程安装技术

Installation Technology for Mega-Overhanging Steel Truss Sky Platforms in Super High-Rise Buildings

摘要: 以超高层空中大悬挑工程案例，针对超高大悬挑钢结构安装过程中结构施工作业面悬空、形状复杂、安装构件体型巨大且重量大、对接对位精度高，吊装稳定性高等特点，通过现场经济可行性分析、深化优化钢结构安装方案、钢结构加工、桁架组件拼装、钢桁架组件吊装、钢结构对接对位焊接等方面着手，对拼装组件措施、整体桁架分块分段、吊装过程的组织和控制进行详细阐述，避免超高空满堂架施工的高投入，获得大悬挑钢结构超高空安装作业的关键控制技术，同时保证安装施工质量安全，使得施工成本得到较大的降低，为同类工程提供参考。

Abstract: Based on a case study of a super high-rise building featuring a large-scale overhanging structure, this paper addresses the challenges inherent in the installation of such mega overhanging steel structures—specifically, the lack of accessible working platforms at great heights, complex geometries, the enormous size and weight of structural components, high precision requirements for alignment and connection, and the need for lifting stability. Through on-site economic feasibility analysis, refinement and optimization of the steel structure installation scheme, steel fabrication, truss sub-assembly, lifting of truss segments, and precision alignment and welding procedures, this study provides a detailed discussion on assembly measures, segmentation strategies for the overall truss, and the organization and control during the lifting process. The approach effectively avoids the high costs associated with full-scale scaffolding at extreme elevations, thereby achieving key technical controls for the installation of large overhanging steel structures at super-high altitudes. This ensures both construction quality and safety while significantly reducing project costs, offering valuable reference for similar engineering projects.