大跨度拱形管桁架整体提升的精度控制

Precision Control of Integral Lifting of Large-span Arch Pipe Truss

某高铁站房为管桁架屋盖结构,屋盖管桁架跨度81 m,采用液压整体提升技术进行施工。为保证提升精度,通过计算机模拟分析,合理地设计杆件预起拱值,控制焊接收缩量,并采用计算机同步液压提升系统对整个提升过程各提升点的同步性进行控制,同时优化卸载顺序,从而保证了大跨度管桁架安装的最终精度。

A high-speed railway station building is a pipe truss roof structure with a span of 81 m.The hydraulic integral lifting technology is used for construction.To ensure the lifting precision,through the computer simulation analysis,the pre-arching value of the bar is reasonably designed,the welding shrinkage is con trolled,and the computer synchr onous hydraulic lifting system is used to control the synchronization of each lifting point in the whole lifting process,and the unloading sequence is optimized so as to ensure the final precision of large-span pipe truss installation.