大跨度钢屋盖结构的整体提升施工技术

Integral Lifting Technology of the Steel Roof of Hangar

西安东航维修基地新机库钢屋盖结构属于正交斜放焊接球空间网架体系,对于此类大跨度复杂钢结构,在建造时多采用计算机控制液压的方法进行整体提升,整个体系在提升状态下的受力情况与设计状态完全不同,必须对提升过程进行施工力学模拟,保证提升过程的安全。采用有限元对钢屋盖结构进行整体提升施工技术研究,并考虑提升高度变化对钢屋盖结构的影响。研究表明:提升高度的变化对提升力基本没有影响,随着提升高度的增加,结构竖向最大变形和杆件最大应力均有所减小;钢屋盖结构提升方案合理,整个提升过程安全可靠;在晴好天气下进行提升时,如果试提升状态满足要求,则整个提升过程是安全的;在此基础上总结了提升施工中的重点、难点问题,为此类大跨度空间钢结构的合理设计和施工提供了参考。

The steel roof of hangar of China Eastern Airline is adopted with the orthogonal diagonal welded spherical grid structure. In construction of these structures, a computer controlled multi-suspension-centers hydraumatic synchronizing lifting construction technology is adopted. The mechanical behavior of the structure in lifting process differs from the design status. For this reason, it is necessary to analysis the internal force and deformation of the structure during the lifting process. The finite element model of the structure in the lifting status is rebuilt and the effect of lifting height is considered. The analytical results show that the change of lifting height has no effect on lifting forces and the maximum deformations and stresses are reduced with the increase of lifting height. The lifting scheme is reasonable and the structure in lifting process is security. It is believed that the process of lifting is safe in the fine weather if the states of tentative lifting meet the requirements. The paper also gives emphasis and difficulty in lifting construction. These results provide a reasonable basis for the construction of large-span spatial structures.