汾河特大桥混凝土连续梁施工质量关键技术控制

Key Technology of Quality Control on Concrete Continuous Beam Construction of Fen River Super Major Bridge

混凝土连续梁一般用于跨径较大的桥梁,多采用现浇及悬臂现浇法施工。支架现浇法需大量的支架和模板,设备一次性投入大,适合地形较好的中小跨径桥梁;悬臂现浇法虽然施工工艺复杂,但因其一次性设备投入少,不受场地限制,特别适合地型差、跨径大的桥梁。本文从悬臂施工中的关键工序着手,结合实际,对施工过程中如何消除支架、挂篮的变形、梁体标高控制、如何解决预应力孔道压浆不饱满问题、体系转换过程中梁体错台的解决方案等展开论述,为今后类似桥梁的施工提供一点借鉴。

Concrete continuous beam is generally used for large span bridge,the cast-in-place method and cast-in-place cantilever are usually adopted. A lot of brackets and templates are needed for cast-in-place brackets,the one-time investment is large,and it just suits for small and medium span bridges; while the cast-in-place cantilever construction technology is complex,because of the less disposable equipment investment and without site constraints,it especially suits for the bridge with large span and under poor terrain. In this paper,we start from the key process of cantilever construction and combined with the actual situation to discuss the solutions in the construction on how to eliminate the deformation of bracket and hanging basket,beam elevation control and how to solve the problems such as prestressed duct grouting is not full,dislocation of beam during system transformation and so on,which can provide a reference for the similar bridge construction.