常泰长江大桥斜拉索施工期扭转影响分析及防控装置设计研究  

Analysis of torsion effects and design of prevention and control devices during the construction period of the stay cable of Changtai Yangtze River Bridge

作　　者：夏鹏飞[1] 康学云[2,3] 厉勇辉 XIA Pengfei;KANG Xueyun;LI Yonghui(Jiangsu Provincial Transportation Engineering Construction Bureau,Nanjing 210004,China;CCCC Second Harbor Engineering Company Ltd.,Wuhan 430040,China;CCCCSHEC Fourth Engineering company Ltd.,Wuhu 241060,China)

机构地区：[1]江苏省交通工程建设局,江苏南京210004 [2]中交第二航务工程局有限公司,湖北武汉430040 [3]中交二航局第四工程有限公司,安徽芜湖241060

出　　处：《现代交通与冶金材料》2024年第5期89-94,共6页Modern Transportation and Metallurgical Materials

基　　金：国家重点研发计划资助项目(2022YFB3706705)。

摘　　要：常泰长江大桥是世界上最大跨径斜拉桥,主跨跨径为1208 m。斜拉索规格和索力大,施工过程中斜拉索扭转问题突出。本文开展斜拉索扭转对主梁安装控制影响的研究,计算分析表明,斜拉索扭转对斜拉索钢丝应力、斜拉索索力均有一定影响,对主梁线形影响显著,斜拉索扭转0.5°,主跨位移变化0.46 m;提出了一种斜拉索张拉防扭转装置及其设计方法,现场应用中斜拉索张拉过程中无扭转现象,施工过程中最大线形误差小于5 cm。Changtai Yangtze River Bridge is the world's largest cable-stayed bridge,with a main span of 1208 m.The specifications and cable tension of the stay cables are significant,and the issue of cable twisting is prominent during construction.This paper investigates the impact of cable twisting on the control of the main beam installation.The computational analysis indicates that cable twisting affects both the stress of the cable wires and the cable tension to a certain extent,significantly influencing the line shape of the main beam.A cable twisting angle of 0.5 deg results in a displacement change of 0.46 m in the main span.This study designs a cable tensioning device to prevent twisting.In field applications,no twisting phenomena were observed during the cable tensioning process,and the maximum line shape error during construction was smaller than 5 cm.

关 键 词：斜拉桥 平行钢丝斜拉索 扭转 无应力长度 防扭转装置 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U443.38[交通运输工程—道路与铁道工程]