合肥新桥国际机场T2航站楼累积提升关键技术研究OA

The steel structure roof of Hefei Xinqiao International Airport Terminal 2(T2)is a large-span spatially curved three-dimensional tubular truss structure system,which adopts a zonal cumulative lifting method.This roof is characterized by significant structural height differences,densely interwoven primary and secondary trusses,and a high workload,posing numerous technical challenges during structural construction.During the construction process,factors such as zonal lifting planning,lifting measure design,construction process simulation,and lifting point unloading closely impact the structural stress state and final quality.To address these,a zonal planning method based on structural contour lines was proposed,which ensured both construction quality and efficiency while maintaining the rationality of horizontal load transfer across the zoned roof.Various combinations of lifting frames were employed for different structural layouts to ensure the rationality of vertical load transfer from the roof to the structural columns.In the detailed construction simulation,the lifting measures were modelled integrally,and initial assembly defects were considered,significantly enhancing the accuracy of simulation results and providing guidance for the design of lifting measures and construction safety verification.Emphasis was placed on analyzing the impact of the unloading sequence of temporary lifting points,with the recommendation to unload temporary lifting points only after the structure formed a stable system,thereby ensuring a reasonable load transfer path to the structural columns.Through the analysis and application of these key technologies,the steel roof was successfully lifted,further enriching and refining the theoretical framework and practical experience of cumulative lifting construction techniques for large-span spatially curved tubular truss structures.