基于桥墩纵向刚度的昆仑号架桥机主支腿受力影响因素及解决方案

Influence Factors of Main Support Leg Force and the Solution of Kunlun Transporting and Erecting Combination Machine Based on Pier Longitudinal Stiffness

昆仑号架桥机可运架千吨级40 m梁通过250 km/h隧道,实现隧道进出口架梁,可满足2 000 m小曲线、30‰大坡道等工况要求;为满足各工况架梁时桥墩设计的纵向刚度要求,需要控制架桥机主支腿纵向力。为此,分析了主支腿纵向力的影响因素(如线路坡度、主梁刚度、主支腿摩擦力等参数因素),构建了主支腿受力模型,并通过参数选择和匹配制定了减小主支腿纵向力的技术方案。昆仑号架桥机已在福厦铁路湄洲湾特大桥工程试用,并通过现场检测,验证了各参数选取的合理性和科学性,为今后的运架一体机技术提升提供了借鉴和技术积累。

Kunlun transporting and erecting combination machine can transport 40 m beam through 250 km/h tunnel,erect 40 m beam in tunnel entrance,and even to be adapted to 2 000 m curve and 30‰ line slope conditions.In order to meet the requirements of the bridge longitudinal stiffness,the longitudinal force of the main support leg must be controlled.Therefore,the author analyzes the different parameters which affect the longitudinal force of the main support leg(e.g.,the slope of the line,the stiffness of the main girder and the friction force),builds the force model of the main support leg,and takes different technical solutions to reduce the force by selecting and matching the parameters.Kunlun transporting and erecting combination machine has been used in Meizhou Bay Bridge of Fuzhou-Xiamen Railway,through the field application,it is justified the rationality and scientificalness of the selected parameters.It provides the reference and technical accumulation for the future technology improvement of transporting and erecting combination machine.