非对称斜拉桥转体称重测试

Weighing Test for Asymmetric Cable-stayed Bridge by Swing Method

南西及西北上行联络线特大桥,是国内首次以非对称斜拉桥结构形式跨越350 km/h武广运营高速铁路,由于该桥具有其独特的非对称性,转体长度为(112+84)m,因此如何确保转体平衡为整个方案的技术控制重点。首先在转体前对不平衡力矩进行分析、理论配重,明确称重试验的目的、测试原理及测试方法,然后对称重试验测试的数据进行分析,从而进一步确定精确配重方案。非对称斜拉桥的转体成功,表明称重测试方法可行,测试确定的偏心距、摩阻系数等关键技术参数能够很好地满足工程实际需求,有效地解决转体不平衡力矩的问题,为该桥转体施工提供了理论技术支持。

As the first domestic asymmetric cable-stayed bridge structure form, southwest and northwest uplink super ma-jor bridge crosses Wuhan-Guangzhou high speed railway with the speed of 350 km/h. As the bridge possesses unique a-symmetry with the swivel length of 112＋84 m, how to ensure the swivel balance is the key technology. First, the unbal-anced torque shall be analyzed and theoretically balanced before rotating , the weighing test purpose, principle and method shall be definite, then the weighing test data shall be analyzed, so as to further determine the precise balance weight scheme. The swivel success of asymmetric cable-stayed bridge shows that weighing test method is feasible, the key parameters such as the eccentric the distance, coefficient of friction resistance and so on can meet the actual demand of engineering, effectively solves the problems of unbalanced moment, provides theoretical and technological support for the swivel construction of asymmetric cable-stayed bridge.