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为满足武汉二七长江大桥非通航孔深水区行洪、景观等要求,采用结构简单、受力合理及施工便捷的设计思路对非通航孔深水区桥梁进行设计。该深水区桥梁采用6×90m钢-混组合连续梁结构,主梁由下层的钢槽梁和上层的预制混凝土桥面板通过剪力钉连接而成。综合考虑施工环境及多种方法的优缺点,并通过计算确定采用升降主墩及临时墩支承高度的方法降低支点负弯矩区混凝土桥面板拉应力;预制桥面板按带裂缝工作的钢筋混凝土构件设计,横向为整体;从便于施工的角度细化了钢槽梁的构造;桥面板与钢槽梁间采用纵向结合方式,剪力钉数量根据受力变化范围分段布置。
In order to meet the requirements of flood and landscape in the non-navigable hole deep water area of Erqi Changjiang River Bridge in Wuhan, the bridge with non-navigable hole deepwater is designed with simple structure, reasonable force and convenient construction. The deep-water bridge uses a 6 × 90m steel-concrete composite continuous beam structure. The main beam is formed by connecting the lower steel channel girder and the upper precast concrete bridge deck through shear nails. Considering the construction environment and the advantages and disadvantages of various methods, and by calculating to determine the use of lifting pier and temporary pier bearing height method to reduce the negative moment zone of the fulcrum concrete slab tensile stress; prefabricated bridge deck with cracks in the work of reinforced concrete members Design and horizontal as a whole. The structure of the steel channel girder is refined from the perspective of easy construction. The longitudinal bond is adopted between the bridge deck and the steel channel girder. The number of shear nails is arranged in stages according to the range of the force variation.