合肥新桥国际机场T2航站楼累积提升关键技术研究
Key Technologies for Cumulative Lifting of Hefei Xinqiao International Airport Terminal 2
合肥新桥国际机场T2航站楼钢结构屋盖为大跨空间曲面立体管桁架结构体系,采用了分区累积提升的施工工艺。该屋盖具有结构高差大、主次桁架交叉布置密度大、施工体量大等特点,给结构施工带来了诸多技术挑战。施工过程中,提升分区划分、提升措施设计、施工过程模拟和提升点卸载等环节均对结构的受力状态和成型质量产生影响。对此,本文提出了一种基于结构等高线的分区规划方法,能够保证施工质量和效率的同时,也保证了分区屋盖荷载水平传递的合理性;针对不同的结构布置形式采用多种提升架组合方式,确保屋盖荷载竖向传递的合理性;在精细化施工模拟时,采用提升措施整体建模方法,并考虑拼装初始缺陷的影响,极大提高了模拟结果的准确性,并为提升措施的设计和施工安全的复核提供了指导;重点分析了临时提升点卸载顺序不同对结构的影响,指出应在结构形成稳定体系后再卸载临时提升点,从而保证荷载向结构柱传递的路径合理。通过对关键技术的分析与应用,最终实现了钢屋盖的顺利提升,进一步完善了大跨空间曲面管桁架结构累积提升施工的关键技术理论体系,并增加了实践经验。
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.
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