某跨海悬索大桥主缆腐蚀环境在线监测系统设计及试验研究  

Design and Experimental Study on the Online Monitoring System for Corrosion Environment of the Main Cable in a Trans-Strait Suspension Bridge

作　　者：张毅 周遇袁 赵梦瑶 刘心怡 马小泽 董泽华[2] ZHANG Yi;ZHOU Yuyuan;ZHAO Mengyao;LIU Xinyi;MA Xiaoze;DONG Zehua(Wuhan CorrTest Instrument Co.,Ltd.,Wuhan 430074,China;School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉科思特仪器股份有限公司,湖北武汉430074 [2]华中科技大学化学与化工学院,湖北武汉430074

出　　处：《材料保护》2024年第10期175-181,共7页Materials Protection

基　　金：国家自然科学基金资助(51771079)。

摘　　要：主缆是悬索桥的生命线,悬索桥主缆腐蚀或断丝直接关系到桥梁运行安全和服役寿命。采用精密电阻腐蚀监测探头、低功耗数据采集器、温度补偿和无线组网技术,在深中通道伶仃洋跨海悬索桥主缆气夹内安装了14套腐蚀监测传感器。探头以主缆裸钢丝为测试元件,实时监测气夹内高强钢丝的腐蚀速率和腐蚀量,并据此建立了一套分布式主缆腐蚀无线监控网络。通过5个月的腐蚀监测现场试验,发现下游主缆的腐蚀速率明显高于上游,且最严重区出现在主缆最低跨部位,其平均腐蚀速率高达147.91μm/a。这表明桥梁建设初期由于主缆除湿除盐装置没有启动,主缆内残留的盐粒和水汽会引起主缆严重腐蚀。根据所建立的主缆内腐蚀数据可视化在线监测系统,可为主缆防护方案的优化提供指导,保证大型悬索桥的运行安全。The main cable of a suspension bridge is the lifeline of the bridge.The corrosion or broken wires of the main cable in the suspension bridge are directly related to the operation safety and service life of the suspension bridge.In this study,a total of 20 corrosion monitoring sen-sors were installed in the main cable sheath of the Lingdingyang trans-strait Suspension Bridge in the Shenzhen-Zhongshan Channel using pre-cise resistance corrosion monitoring probes,low-power data collectors,temperature compensation,and wireless networking technology.The probes utilized the bare steel wires of the main cable as the testing elements to monitor in real-time the corrosion rate and amount of corrosion of the high-strength steel wires in the sheath,establishing a distributed wireless monitoring network for main cable corrosion.Through five months of corro-sion monitoring tests,it was found that the corrosion rate of the downstream main cable was significantly higher than that of the upstream section,with the most severe corrosion occurring at the lowest span of the main cable,where the average corrosion rate reached 147.91μm/a.This indica-ted that,due to the failure to activate the dehumidification and desalination device during the early stages of bridge construction,the residual salt particles and moisture inside the main cable caused severe corrosion.Based on the visual online monitoring of corrosion data inside the main ca-ble,guidance was provided for optimizing the protection scheme of the main cable,ensuring the safe operation of large suspension bridges.

关 键 词：悬索桥 主缆 腐蚀监测 电阻探针 主缆防护 

分 类 号：TG172.3[金属学及工艺—金属表面处理]