一种改进的拱桥悬浇扣挂施工方法及应用

An Improved Construction Method of Cantilever Casting with Buckling Cables for Arch Bridges and Its Application

为避免在拱桥悬浇扣挂施工中进行复杂的扣索力优化计算,提出一种通过增加水平索在施工过程中抵消扣索水平力的悬浇扣挂施工方法,并以涪陵乌江大桥复线桥工程为例,采用该方法控制其施工过程中的扣索力,并与原设计计算进行对比。结果表明:1)该方法可优化主拱的临时支撑条件,使主拱的结构行为变得相对简单;2)该方法对主拱的位移和应力控制能力较强,是一种可行的大跨径拱桥施工方法。

In order to avoid the complex optimization calculation of the buckling cable forces in the construction of the cantilever with buckling cables of the arch bridge,a method of increasing the horizontal cables is proposed for the construction of the cantilever with buckling cables of the arch bridge to offset the horizontal force of the buckling cables during the construction process.The calculations for the Fuling Wujiang double-line bridge project are taken as an example.This method is used to control the buckling cable force during construction,and is compared with the original design calculations.The results show that:1)the method can optimize the temporary support conditions of the main arch,making the structural behaviour of the main arch relatively simple;2)The method is a viable method for the construction of large-span arch bridges,as it has a strong ability to control the displacement and stress of the main arch.