红岛国际会展中心钢屋盖液压同步滑移施工结合施工预应力技术应用研究

RESEARCH ON THE APPLICATION OF HYDRAULIC SYNCHRONOUS SLIPPING CONSTRUCTION TECHNIQUE COMBINED WITH CONSTRUCTION PRESTRESSING TECHNIQUE IN HONGDAO INTERNATIONAL EXHIBITION CENTER

以红岛国际会展中心大跨钢屋盖采用液压同步滑移与施工预应力技术相结合的施工工法为基础,以施工预应力施加对滑移施工过程影响为切入点,对两种技术联合应用进行研究。结果表明:滑移单元拆撑顺序及补档杆件补档时机均需考虑施工预应力影响;施工预应力施加改变了滑移单元的应力刚度,增加了滑移单元平面外失稳风险,需根据具体工程确定是否采取加固措施;滑移过程中滑靴不同步对滑移单元受力性能的影响需考虑施工预应力叠加效应。

Based on the combination of hydraulic synchronous sliding technique and construction prestressing technique applied in the long-span steel roof construction of Hongdao International Exhibition Center construction,the paper studied the combined application of the two techniques by taking the influence of construction prestressing on the construction process as the breakthrough point.The results showed that the removing temporary support sequence of the sliding unit and the time of filling the gear bar should consider the influence of construction prestress;the application of construction prestress changed the stress stiffness of the sliding unit and increased the risk of out-of-plane instability of the sliding unit,so it was necessary to determine whether to take reinforcement measures according to the specific project;the effects of sliding boots unsynchronization on the mechanical properties of the sliding unit during the sliding process were discussed with consideration of prestressing superposition effect.