大跨径钢管拱纵移段提升塔设计与施工

Design and Construction of Lifting Tower for Longitudinal Displacement Section of Long-span Steel Tube Arch

郑万高铁汉江双线特大桥以(109+220+109)m连续刚构拱的形式跨越汉江,主桥钢管拱跨度为220m,矢高为44mm,采用异位拼装+整体纵移+整体提升的施工方案。钢管拱异位拼装部分重达667t,提升塔搭设长度达90m,提升高度达18m,提升高度大,提升塔受力时间较长,设计难度较大,施工风险较高。介绍提升塔设计控制要点,包括搭设位置选择、主体结构控制、高度及间距控制等,详细阐述钢管拱提升塔设计、施工及钢管拱整体提升。该方法保证主桥钢管拱顺利施工完成并缩短施工工期。

The double track super major bridge of Hanjiang River crosses Hanjiang River in the form of(109+220+109)m continuous rigid frame arch.The span of steel tube arch of the main bridge is 220m,and the rise height is 44mm.The relatively novel construction scheme of heterotopic assembly+overall longitudinal movement+overall lifting is adopted.The weight of the steel pipe arch heterotopic assembly part is 667t,the erection length of the lifting tower is 90m,the lifting height is 18m,the lifting height is large,the lifting tower has a long time of stress,the design is difficult,and the construction risk is high.This paper introduces the design control points of the lifting tower,including the selection of the erection position,the control of main structure,the height and the spacing,and expounds in detail the design,construction and the overall lifting of the steel tube arch.This method can ensure the smooth completion of the main bridge steel tube arch construction and shorten the construction period.