海上悬索桥大风条件下主缆索股架设关键技术  

Key Technologies for Erecting Main Cable Strand of Offshore Suspension Bridge under Strong Wind

作　　者：朱鹏 李冕 张军政 王永威[2,3,4] ZHU Peng;LI Mian;ZHANG Jun-zheng;WANG Yong-wei(Guangdong Provincial Highway Construction Co.,Ltd.,Guangzhou Guangdong 510623,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan Hubei 430014,China;Key Laboratory of Long-span Bridge Construction Technology of Transport Industry,Wuhan Hubei 430014,China;CCCC Highway Bridges National Engineering Research Centre Co.,Ltd.,Beijing 100011,China)

机构地区：[1]广东省公路建设有限公司,广东广州510623 [2]中交第二航务工程局有限公司,湖北武汉430014 [3]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430014 [4]中交公路长大桥建设国家工程研究中心有限公司,北京100011

出　　处：《公路交通科技》2023年第9期91-98,共8页Journal of Highway and Transportation Research and Development

基　　金：国家重点研发计划项目(SQ2021YFF05002684)。

摘　　要：为解决大风条件下基准索股架设及一般索股调整作业窗口期短、人员高空作业时间长、测量效率低的难题,利用分跨锚固的高精度标记索股直接对位安装,通过相对高差测量进行基准索股架设,避免在海中测量平台通过全站仪进行连续观测。设计了抑振装置+V形保持器,在索股架设前期有效地利用猫道的刚度,抑制主缆索股在大风环境下的位移,保证人员通行安全或作业条件,结合有限元分析和现场实际应用情况验证了抑振效果。应用基于机器视觉的索股高差动态量测技术对一般索股进行了线形测量,通过预测一般索股和基准索股的静态高差进行调索,代替了传统人工测量手段,提高测量效率,减少人为误差。现场实测结果表明:标记索股的长度精度达到了1/60000,垂度误差满足规范要求的1/20000,基准索股架设周期缩短至1 d;抑振装置+V形保持器可有效减小主缆索股在大风条件下的晃动幅度,主缆索股相对猫道的横向位移可最大减少4.3 m,保证了有风条件下主缆作业条件;基于机器视觉的一般索股动态测量方法,实现了索股晃动情况下的高精度测量,索股高程测量精度在5 mm以内。上述主缆索股架设技术可减小大风环境对主缆索股架设和线形调整的影响,减少现场操作人员30%,降低施工风险,缩短架设工期1个月以上,可为后续类似工程的设计施工提供借鉴。In order to solve the problems of short window period,long overhead operation time of personnel and low measurement efficiency during datum strand erection and general strand adjustment operation under strong wind,the direct alignment installation is conducted by using marked cable strands for span anchoring,and the datum strand is erected through relative elevation difference measurement to avoid continuous observation by total station on offshore measurement platform.A vibration suppression device and V-shaped retainer are designed to effectively utilize the stiffness of the catwalk to suppress the displacement of the main cable strand in strong wind environment and ensure personnel safety or working condition in the early stage of cable strand erection.The vibration suppression effect is verified based on finite element analysis and on-site application.The linear shapes of general cable strands are measured by using the dynamic measurement technology of cable strand height difference based on machine vision.The cables are adjusted by predicting the static height difference between the general cable strand and the datum cable strand,which replaced the traditional manual measurement method,improved the measurement efficiency and reduced man-made errors.The on-site measurement result shows that(1)the length accuracy of the marked cable strands reaches 1/60000,the sag error meets 1/20000 of the specification requirement,and the erection period of the datum cable strands is shortened to 1 d;(2)the vibration suppression device and V-shaped retainer can effectively reduce the shaking amplitude of the main cable strand under strong wind,and the lateral displacement of the main cable strand relative to the catwalk can be reduced by a maximum of 4.3 m,which ensures the operating condition of the main cable under windy condition;(3)the general cable strand dynamic measurement method based on machine vision has achieved high-precision measurement under cable strand shaking condition,the measurement accuracy of cable stran

关 键 词：桥梁工程 主缆架设 有限元分析 悬索桥 大风条件 基准索股 抑振装置 机器视觉测量 

分 类 号：U445[建筑科学—桥梁与隧道工程]