跨江钢—混组合梁桥顶推施工关键技术研究  

Research on Key Technologies of Incremental Launching Construction of River-crossing Steel-Concrete Composite Beam Bridge

作　　者：袁龙泉 YUAN Long-quan(China Railway 1lth Bureau Group Corporation Limited,Wuhan 430061,China)

机构地区：[1]中铁十一局集团有限公司,武汉市430061

出　　处：《公路》2024年第9期85-90,共6页Highway

摘　　要：依托某顶推施工的跨江钢—混组合梁桥项目,详细介绍了顶推方案和关键技术点,并通过有限元方法研究了永久结构和临时构件的受力性能。根据该桥的受力和施工要求,将顶推划分为3个阶段,顶推距离依次为20.05 m、57.95 m、90.1 m。顶推过程以位移控制为主,以压力控制为辅。在最不利状况下,钢箱梁、临时墩的强度、刚度和稳定性满足要求,导梁和钢箱梁的连接焊缝满足正应力和剪应力要求;导梁需要进一步增加横向和纵向加劲肋,方能满足局部稳定性要求。Based on a river-crossing bridge with steel-concrete composite girder structure built by incremental launching,the scheme and key technical points of incremental construction are introduced in detail,and the mechanical properties of permanent structures and temporary components are studied by finite element method.According to the force-bearing demand and construction requirements of the bridge,the incremental launching construction is divided into three stages,and the distance of incremental launching is 20.05 m,57.95 m and 90.1 m respectively.The process of incremental launching is mainly based on displacement control,supplemented by pressure control.Under the most unfavorable conditions,the strength,stiffness and stability of the steel box girder and temporary piers meet the requirements.The connecting welds between guiding beam and steel box girder meet the requirements of normal stress and shear stress.The guide beam needs to further add the transverse and longitudinal stiffeners to meet the requirement of local stability.

关 键 词：桥梁工程 跨江桥梁 钢—混组合梁桥 顶推法施工 有限元分析 

分 类 号：U445.462[建筑科学—桥梁与隧道工程]