空间双索面自锚式悬索桥体系转换技术研究

Research on System Transformation Technology of Spatial Double Cable Plane Self-anchored Suspension Bridge

以双塔三跨空间双索面自锚式悬索桥——联盟路渭河大桥为背景,采用有限元模拟、吊索循环张拉、主索鞍“小步快跑”顶推等方法,研究大桥吊索索力、主梁挠度及桥塔偏位等误差,使其控制在施工要求范围内。通过有限元模拟法,制定了吊索张拉初步施工方案;采用循环张拉法,解决了吊索M9因接长杆长度受限而无法安装的问题,与此同时结合“小步快跑”法进行主索鞍顶推,优化了吊索张拉方案。在体系转换过程中,通过对主梁挠度和桥塔偏位进行实测,发现施工控制与有限元仿真模拟结果基本吻合,精度满足施工要求。研究结果可为同类型桥梁施工提供借鉴。

Taking the self-anchored suspension bridge with two towers and three spans and two cable planes, Weihe Bridge on Union Road as the background, the purpose of this study is to control the errors such as cable force, deflection of main girder and deviation of bridge tower within the scope of construction requirements.The finite element simulation, cyclic tension of sling, and small step and fast running method to push main cable saddle are adopted in the study.The results show that the problem that the sling M9 can not be installed because the limited length of extension rod is solved by adopting the cyclic tension method.At the same time, the main saddle is pushed by combining the small step and fast running method, which optimizes the tension scheme of the sling.In the process of system transformation, through the actual measurement of the deflection of the main girder and the deflection of the bridge tower, it is found that the results of construction control are basically consistent with those of finite element simulation, and the accuracy meets the construction requirements.The research results of this paper could provide reference for similar bridge construction.