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“川藏第一桥”结束最后质检 雅康高速月底通车

2018-12-18 16:32:00    新华网

新华社成都12月18日电(记者胡旭)18日上午9点30分,雅康高速公路泸定大渡河兴康特大桥顺利结束荷载试验,正式完成大桥通车前的最后一道质量检验工作,标志着这一重大工程进入到最终交付使用环节,为雅康高速月底全线通车奠定了坚实基础。

全长135公里的雅康高速是内地进入藏区的交通大动脉,而兴康特大桥作为雅康高速全线重点控制性工程之一,是一座建设在高海拔、高地震烈度带、复杂风场及温度场环境下的超大跨径钢桁梁悬索桥,全桥长1411米,主跨1100米,桥面至大渡河水面239米,被誉为“川藏第一桥”。

你一定没有见过68辆大货车同时驶上一座大桥的场面,而这一场景在兴康特大桥的荷载试验中持续了4天。

“每辆车重30吨,总重达2040吨。”负责测试的中国中铁科研院西南院高级工程师张三峰介绍,荷载试验分为静载和动载两部分,目的是判断桥梁承载能力是否符合设计和相关规范要求,能否满足通车条件,为今后长期健康监测提供初始数据,同时为日后养护、管理的决策提供科学依据和支持。

在静载试验中,68辆大货车分批行驶上桥,停放在大桥的15个不同试验工况部位,同时,300多个传感器记录下应力、变形、温度等相关数据,在第一时间传输到测试系统,技术人员通过系统反馈的数据进行现场研判,判断测试数据是否符合设计及相关规范要求。

在动载试验中,4辆满载共120吨相当于约80辆小汽车重量的载重卡车,以每小时5至80公里不等的速度在大桥上行驶,以测试大桥在通车条件下所产生的实际承载能力、晃动、振幅、位移等。技术人员通过测试桥梁结构动力特性及动态响应,来验证桥梁是否在正常的工作状态。

张三峰介绍,从目前静载试验情况来看,试验结果与设计及相关规范要求非常吻合,符合同类型桥梁结构受力特征。接下来技术人员还会对动载试验数据进行进一步的分析论证,评估桥梁实际承载能力。

据悉,雅康高速预计将在本月底全线通车。届时,从成都驾车到甘孜康定将缩短至4小时以内。

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