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我国首座公铁两用海峡大桥架设首片钢桁梁

2017-08-22 18:50:25   中国经济网

经济日报-中国经济网北京8月22日讯 (记者齐慧、通讯员张静)8月22日上午9时,随着“大桥海鸥号”起重船将长80米、宽35.5米、重达1350吨的钢桁梁稳稳地放置到墩顶,由中铁大桥院设计、中铁大桥局施工的平潭海峡公铁两用大桥首孔简支钢桁梁架设成功,标志着我国首座跨海峡公铁两用大桥建设取得突破性进展。

由中铁大桥局打造的“大桥海鸥号”起重船正在吊装平潭海峡公铁两用大桥首孔简支钢桁梁。 张静摄

“平潭海峡公铁两用大桥是我国目前施工难度最大的桥梁。”据中铁大桥局董事长、福平铁路FPZQ-3标项目经理刘自明介绍,平潭海峡公铁两用大桥起于福建省长乐市松下镇,经过四座岛屿后到达平潭岛。大桥全长16.34公里,是世界上最长的跨海峡公铁两用大桥。

“此次钢桁梁整孔吊装在国内尚属首例,施工工艺难度极大。”据中铁大桥局总经理助理、福平铁路FPZQ-3标项目常务副经理张红心介绍,鉴于平潭海峡公铁两用大桥桥址区域恶劣的建设环境,如何将重达1350吨的钢桁梁进行吊装,成为了施工中一道巨大的难题。针对这一难题和通航的考虑,中铁大桥局历时3年、耗资3.4个亿打造了“大桥海鸥号”自航双臂架变幅式起重船,起重能力达3600吨——相当于2400辆小轿车的重量,主钩起升高度达110米——相当于39层楼高,是国内起重量最大、起升高度最高的双臂架起重船。此次整孔钢桁梁的成功架设,为大桥后续33孔简支钢桁梁(分80米、88米两种)架设提供了重要施工技术参数,也为全桥上部结构施工的稳步推进奠定了坚实基础。

由中铁大桥局打造的“大桥海鸥号”起重船正在吊装平潭海峡公铁两用大桥首孔简支钢桁梁。 张静摄

平潭海峡公铁两用大桥是新建福州至平潭铁路、长乐至平潭高速公路的关键性控制工程。建成后,将大大缩短福州至平潭的时空距离,届时福州将与平潭形成半小时“生活圈”和“经济圈”。同时大桥的建设,也将为今后同类型桥梁施工提供可靠的经验借鉴。

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