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全国首座在建铁路悬索桥:沉井面积抵标准足球场
2017-08-19 05:01:21 中国青年网
相当于4艘 辽宁舰总吨位的沉井
8月18日,现代快报记者从中交二航局获悉,经过一年多的施工,连淮扬镇铁路的关键性控制工程,五峰山公铁长江大桥北锚碇沉井接高全部完成,该锚碇沉井为世界面积最大沉井基础。
这个沉井可是个“庞然大物”,长101米、宽72米、高56米,面积与一个标准足球场相当,高度相当于18层大厦。总重量达24万吨,相当于4艘辽宁舰满载排水量的总吨位,是名副其实的“世界第一井”。
据了解,大桥北锚碇沉井的作用就是牢牢“扎”进地下,通过悬索靠着自身重量稳稳拉起桥身。本次是沉井的第10次,也是最后一次混凝土接高浇筑,浇筑方量为5000立方。沉井接高浇筑总方量接近10万方,用钢量多达7800吨。
作为连淮扬镇铁路的关键控制性工程,五峰山公铁长江大桥全长6400多米,其中主跨为1092米,采用单跨悬吊钢桁梁悬索结构,上层为8车道高速公路(设计速度每小时100公里),下层为4线高速铁路通道(设计速度每小时250公里)。
大桥建成后,将成为中国第一座铁路悬索桥,也是世界上荷载和速度第一的铁路悬索桥。超过目前世界上最大跨度公铁两用悬索桥——日本濑户大桥中的南备赞桥。
据锚体架子队队长王通介绍,浇筑完成的沉井将依次进行混凝土养护、模板拆除和第三次下沉准备工作。备受关注的沉井最后一次下沉预计今年9月下旬进行。
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