管翼缘钢混组合梁滑移传递吊装施工技术

Construction Technology of Slipping Transfer Hoisting of Steel-concrete Composite Girder with Tube Flange

钢箱梁由于施工周期较短、跨径大、结构稳定等优点,逐步成为大跨度桥梁首选。G109线(忠和傅家窑—八里湾段)改扩建工程上跨连霍高速公路主线桥采用51m+61m+51m管翼缘钢混组合梁,该桥与既有G30高速呈63°斜交,钢主梁采用高强度耐候钢焊接。由于项目施工环境复杂,通过多方案比选和利用有限元软件建立三维模型进行结构受力和变形分析,最终采用滑移传递吊装方案,实现钢箱梁快速吊装、高精准就位。实践证明,该吊装方案组织合理,对地面交通干扰较小,施工周期短,安全风险和施工成本较低,解决了大跨度钢结构跨既有道路吊装的难题,为钢混组合梁架设提供了一种新思路。

Because of the advantages of short construction period,large span and good structural stability,steel box girder becomes the first choice for long-span bridges.Line G109(Zhonghe Fujiayao to Baliwan section)reconstruction and expansion project across Lianhuo expressway main line bridge adopts 51m+61m+51m flange steel composite girder,the bridge is at an angle of 63°with the existing G30 express way,the steel main girder uses high strength weathering steel welding.Due to the complex construction environment of the project,through multi-scheme comparison and selection and the use of finite element software to establish a three-dimensional model for structural stress and deformation analysis,and finally the slipping transfer hoisting scheme to achieve rapid construction and high precision placement of steel box girder is adopted.The practice proves that the hoisting scheme has reasonable organization,little interference to road traffic,short construction period,low safety risk and low construction cost,which solves the problem of hoisting large-span steel structures across existing roads and provides a new idea for the erection of steel-concrete composite girder.