摘要
对于大悬挑钢结构施工,如采用单元吊装的安装方法,由于临时支撑的使用,结构在施工阶段的受力状态与最终的设计受力状态存在很大差异。临时支撑的卸载是结构由施工状态向设计状态转变的关键,卸载工序十分复杂。结合具体工程的结构特点和现场条件,介绍了针对临时支撑的分区、对称、同步、分级卸载技术。采用软件分析卸载过程中结构系统的应力状况和位移控制值,运用千斤顶作为主要卸载工具,选择合理的卸载顺序,精心组织现场施工,对临时支撑成功地进行了卸载。在卸载阶段对主体结构进行了健康监测,监测结果表明卸载后钢屋盖的应力和变形均符合设计要求。另外,也介绍了卸载过程中的安全技术措施和应急预案。
If large cantilever steel structures are lifted and installed by elements , then the load status of the whole structure in construction stage will be greatly different from that of design stage due to use of temporary support.The unloading operation for temporary support is critical for structural transition from construction to design condition and also is a very complicated process.In this paper , an area-by-area , symmetric , synchronized and step-by-step unloading technology for temporary support is introduced according to the structural features and site conditions of a specific project.Based on the stress condition and deformation value of the structure during unloading obtained by software analysis , screw jacks are used as the main unloading tool and the well organized unloading operation for temporary support is completed successfully by choosing reasonable unloading sequence.Health monitoring for this steel structure is carried out during unloading , the monitoring results show that both the maximum stress and deformation of steel roof meet design requirement.In addition , safety measurement and emergency plan are also proposed in this paper.
出处
《建筑钢结构进展》
北大核心
2012年第5期59-64,共7页
Progress in Steel Building Structures
关键词
大悬挑钢结构
临时支撑
卸载
螺旋千斤顶
结构分析
健康监测
应急预案
large cantilever steel structure
temporary support
unloading
screw jack
structural analysis
health monitoring
emergency plan
