张皋过江通道工程主缆监测数据的试验探究

Internal airflow organization based on main cable monitoring data experimental study

悬索桥的主缆是悬索桥的“生命线”,主缆的防腐事关悬索桥的运行安全与寿命。主缆防腐有主动防腐与被动防腐两种,目前主动防腐是主缆防腐的主要方法。主动防腐的原理就是利用外部制备的干燥空气(相对湿度<45%RH)送入主缆内将主缆内残留的水分清除,同时主缆内保留微正压,使外部潮湿空气与水分无法再进入主缆,为主缆内部控制湿度提供一种有效的方法。试验以张皋过江通道大桥工程为背景,模拟一个送风单元的气流状况,由于主缆内部是微孔流,目前对微孔流内部的气流组织无有效方法监测,通过设计新的试验方法,通过监测含湿量的方式,监测到气流在主缆内部流动状态。

The main cable is the lifeline of a suspension bridge,the anticorrosion of main cable is important to the safety and life of suspension bridge.There are active and passive anticorrosion for main cable,at present,active anti-corrosion is the main method for anticorrosion of main cable.The principle of active anticorrosion is to send dry air(relative humidity<45%)prepared externally to the main cable,remove residual moisture from the main cable,mean-while,slight positive pressure is retained in the main cable,so that external damp air and water can no longer enter the main cable.It provides an effective method to control the humidity inside the main cable.Taking Zhanggao River Cross-ing Bridge project as the background,the airflow condition of a supply air unit is simulated experimentally,due to the micropore flow inside the main cable,there is currently no effective method to monitor the airflow law inside the micropore flow.By designing a new test method to effectively monitor the flow of air inside the main cable.