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港珠澳大桥最终接头2日沉放 5664米海底隧道全线合龙
央广网珠海5月1日消息(记者郭翔宇)据中国之声《全国新闻联播》报道,明天(2日)上午,港珠澳大桥将进行海底隧道最终接头正式吊装,它的对接成功,将标志着全长5664米的海底隧道全线贯通。
最终接头是港珠澳大桥沉管隧道贯通的控制性枢纽,也是全线合龙的最后一环。港珠澳大桥管理局总工办主任陈越用了“行百里路半九十”来形容最终接头的重要性,“快六年了,走到今天,整个隧道33个管节全部顺利安放,整个隧道就差这几米的最终接头,行百里路半九十,如果这个做不成,整个隧道就没办法投入使用。”
与其他沉管管节不同,最终接头构件采用“三明治”钢壳混凝土结构,整体呈楔形,高11.4米,底板长9.6米,顶板长12米,重达6000吨。这样一个“大家伙”入水后还要受洋流、浮力等影响,姿态会发生变化。为了保证吊装完成后顺利止水,高低差控制在15mm以内。并且必须一次成功。
陈越介绍,“水的横流对最终接头的影响就更加敏感,它很容易摆,到了这个季节,径向流量就会加大,往年这个时候已经要达到每秒2万立方以上,因此误差无论横向也好纵向也好,误差我们最多就在7公分,我们争取能够控制在5公分以内。”
完成这样一次“毫米级”水下对接大任的吊装船“振华30”同样来路不小。作为目前世界上最大的的单臂全回旋起重船,振华-30拥有12000吨的单臂起重能力和7000吨全回旋起重能力,相当于可以同时吊起45架空客A380飞机。港珠澳大桥副总工程师钟辉虹透露,即使是负责起吊最终接头的看似普通的4根吊索,也大有讲究,“因为你要吊起6000吨的东西,重量可想而知。是非常重的,所以要专门设计吊索,吊索的直径达到50公分。而且吊起来东西要平,那么这么长的吊索要在吊这么重的情况下,肯定会伸长的,但是伸长量相差又不能太大,要控制在5公分,因此是专门做设计,专门做制造。”
在最终接头成功吊装焊接到位,将标志着港珠澳大桥主体工程全线贯通。
原标题:港珠澳大桥最终接头明日沉放
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