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港珠澳大桥进行海底隧道最终接头正式吊装

2017-05-02 15:35:33   央广网

央广网珠海5月2日消息(记者郭翔宇)据中国之声《央广新闻》报道,今天上午,港珠澳大桥进行海底隧道最终接头正式吊装,在最终接头对接成功并完成焊接等后续工作之后,全长5664米的海底沉管隧道将实现合龙。

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“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,整个隧道就差这几米最终接头,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,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,争取控制在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,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,在最终接头成功吊装焊接到位之后,标志着港珠澳大桥主体工程全线贯通,“把最终接头安装到位,两个沉管实现钢接以后,港珠澳大桥29.6公里的桥、岛、隧主体结构实现结构的贯通。”

责任编辑:李皓 CN002
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