钢箱桁组合梁转体桥拼装顺序研究

Research on Assembly Sequence of Steel Box Truss Composite Beam Swivel Bridge

摘要:

以合（肥）新（沂）高铁跨京沪高铁特大桥为工程背景，研究了钢箱桁组合梁转体桥的拼装顺序和关键技术。结果表明：“3+1侧拼”法显著提高了钢桁梁的组装效率，有效解决了全焊接钢箱桁结构施工中普遍存在的焊接变形、安装精度及高空作业难等挑战。同时，采用钢码板和杆端开口技术，解决了焊接空间受限的问题。转体施工中，通过设定3°的试转和67°的正式转体角度，实现了安全性与可控性的双重保障。该研究成果为类似大跨度钢箱桁组合梁桥的施工提供了技术参考。

Abstract:

Taking the Hefei-Xinyi High-speed Railway Bridge over the Beijing-Shanghai High-speed Railway as the engineering background, the assembly sequence and key technologies of steel box truss composite beam swivel bridge are studied. The results show that the “3+1 side-assembly” method has significantly improved the assembly efficiency of the steel truss beam, effectively addressed the common challenges in the construction of fully welded steel box truss structures, including welding deformation, installation accuracy and difficulties associated with high-altitude operations. Concurrently, the steel setting plates and rod end opening technologies are used to overcome the problem of limited welding space. During the swiveling construction, by setting a trial swiveling angle of 3° and a formal swiveling angle of 67°, the dual guarantees of safety and controllability are realized. This research outcome provides the technical references for the construction of similar long-span steel box truss composite beam bridges.