Abstract: Chongqing?Chaotianmen?Yangtze?River?Bridge?is?the?largest-span?steel?truss?arch?bridge?in?the?world?currently.?During?the?period?of?cantilever?installation,?two?pairs?steel?strand?cables,?together?with?the?main?arch?forming?a?self-anchor?common?balance?working?system,?are?set?up?to?control?the?inner?force?and?deformation?of?the?structure?of?main?arch.?Each?cable?group?contains148?stocks?of?steel?hinge?lines?and?the?biggest?rally?is?up?to?16661kN.?One-time?tensioning?formation?technology?of?single?steel?strand?wire?is?adopted?in?the?construction.?The?principle?of?the?technology?is?simple,?and?it?is?convenient?for?construction,?which?may?offer?references?to?similar?projects.

Key words: steel truss arch bridge , cantilever installation , anchor cable of steel lines , one-time tensioning formation technology of single steel strand wire ;

摘要： 重庆朝天门长江大桥是目前世界上最大跨度的钢桁架拱桥,在悬臂安装施工期间,设两对钢绞线扣索,与主 拱形成自锚平衡共同受力体系,控制主拱结构内力和变形。单根扣索使用148股钢铰线,最大拉力16661kN,采用 单股钢绞线一次张拉成型的技术施工,其技术原理简单,施工方便,可供类似工程参考。

关键词: 钢桁架拱桥, 悬臂安装, 钢绞线扣索, 单股一次张拉成型