自锚式悬索桥体系转换标记线控制法  

Tag Line Control Method for System Transformation of Self-Anchored Suspension Bridge

作　　者：李爱群[1] 李建慧[2] 

机构地区：[1]东南大学土木工程学院混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]南京林业大学土木工程学院,江苏南京210037

出　　处：《桥梁建设》2013年第5期37-41,共5页Bridge Construction

基　　金：国家杰出青年科学基金项目(50725828);国家自然科学基金项目(51278104);江苏省交通科学研究计划项目(2011-47-3)~~

摘　　要：为避免自锚式悬索桥体系转换初张拉阶段高空作业,使初张拉过程简单易行,根据体系转换过程中的力学特性,提出一种适用于初张拉阶段的标记线控制法。该方法在吊索初张拉前设置标记线,根据体系转换初张拉阶段的吊索目标值,确定对应的缆索线形,从而确定初张拉阶段标记线的最终位置,以此为控制量完成初张拉阶段的体系转换。将该方法应用于南京江心洲大桥的体系转换,实践表明,该方法能保证主缆线形合理,吊索力与理论计算相近,同时便于实施与控制,精度可满足工程需要。To avoid the construction high above the ground at the suspender initial tensioning stage of system transformation of the self-anchored suspension bridge and to make the tensioning process simply and easily operable,a tag line control method suitable for the initial tensioning stage was put forward in regard of the mechanical characteristics in the process of the system transformation.In the method,the tag lines were set before the tensioning of the suspenders and in accordance with the target values of the suspenders at the tensioning stage,the corresponding alignment of the main cables was determined and the final locations of the tag lines for the tensioning stages were hence determined.By taking the final locations as the control amounts,the system transformation at the initial tensioning stage would be completed and the method was already applied to the construction of the Jiangxinzhou Islet Bridge in Nanjing.Practice proves that with the method,the rational alignment of the main cables can be guaranteed,the actual force values of the suspenders are close to the theoretic calculation ones.Moreover,the method and control are conveniently implemented and the precision of the construction can satisfy the relevant requirements.

关 键 词：悬索桥 体系转换 初张拉 控制 吊索 标记线法 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U44[交通运输工程—道路与铁道工程]