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这类建筑全球超一半“最长”“最高”纪录在中国

2017-06-08 21:31:19   央视新闻客户端

当下,港珠澳大桥正在紧张施工,预计6月内大桥主体工程便将全线贯通。有统计数据显示,五年来,全球超过一半的大跨度桥梁都出现在中国,“最长、最高”这样的纪录,不断被写进世界桥梁史,它们不仅让“天堑变成通途”,更让“中国桥”成为展示中国形象的新品牌。中国大桥到底创下了哪些纪录?

全球在建的最长跨海大桥港珠澳大桥

目前,港珠澳大桥的海底隧道正在进行最终接头的钢封门拆卸工作,该工作完成后,这项全世界最大规模的跨海桥岛隧工程主体部分将全面贯通。

这一超级工程今年正式开通后,跨过珠海,连接澳门半岛,通向香港大屿山,从珠海到香港只需要30分钟车程。

作为目前世界上在建的最长跨海大桥,全长55公里的港珠澳大桥拥有世界上最长的6.7公里海底隧道,组成隧道的33根沉管,每一节都堪比一艘航空母舰的体量。

而建造这样一座大桥的背后,是中国人要解决超长的跨海距离、超深的海水深度、超级台风、洋流冲击和海浪冲刷等一系列世界性的难题。

△港珠澳大桥沉管隧道最终接头进行吊装对接

港珠澳大桥有近4公里的沉管隧道埋深超过20米,这在世界上还没有先例。中国工程师创新地提出了“半刚性”沉管的结构概念,开发了基于材料断裂力学特性的“记忆接头”。“为了获得这一认知,我们经历了7年岛隧建设中最为曲折的过程。”港珠澳大桥岛隧工程总工程师林鸣感慨地说。

看着中国国旗升起感慨万千

沉管隧道工程最终获得了500多项专利,创造了“最长、最大跨度、最大埋深、最大体量”四个世界纪录。

直到今天,林鸣依然难忘那个场景——前些年,他和几位同事为了沉管最终接头设计到荷兰做试验,荷兰一家顶级的工程咨询公司邀请他们去交流。为了欢迎中国工程师,他们专门升起了中国国旗,这是自1881年公司成立以来第二次为来宾升起国旗。

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