独塔无背索混合塔斜拉桥施工技术与创新

Construction Technology and Innovations of a Single-Tower,Back-Stay-Free Hybrid Pylon Cable-Stayed Bridge

独塔无背索混合塔斜拉桥作为新型桥梁结构,在现代桥梁工程中逐渐受到关注和应用。以某(25+80+35)m的独塔双索面无背索混合塔斜拉桥为工程背景,采用创新的自平衡施工法,通过主梁、主塔及斜拉索形成自平衡体系,实现无模板、无支架施工,简化流程,降低成本;通过有限元仿真计算、现场实测相结合的方法,优化索力调整方案,确保了最终成桥索力与设计值的误差在-6.4%~6.59%之间;通过自适应控制方法,实时监测和调整主塔偏位等参数,有效控制了施工过程中的结构精度和安全性。这些成果为独塔无背索混合塔斜拉桥的施工提供了重要的技术支持和理论依据。

As an emerging bridge structure,the single-tower,back-stay-free hybrid pylon cable-stayed bridge has garnered increasing attention and application in modern bridge engineering.Taking a(25+80+35)m single-tower,double-cableplane,back-stay-free hybrid pylon cable-stayed bridge as the engineering background,an innovative self-balancing construction method was employed.By establishing a self-balancing system composed of the main girder,main tower,and stay cables,the construction was carried out without the use of formwork or scaffolding,thereby simplifying the process and reducing costs.Through the integration of finite element simulations and on-site measurements,the cable force adjustment plan was optimized,ensuring that the final cable forces of the completed bridge deviated from the design values by no more than-6.4%to 6.59%.Furthermore,adaptive control methods were utilized to monitor and adjust key parameters such as tower deviation in real time,effectively controlling structural precision and ensuring safety throughout the construction process.These findings provide significant technical support and theoretical foundations for the construction of single-tower,back-stay-free hybrid pylon cable-stayed bridges.