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世界最大跨度铁路拱桥顺利合龙

2018-12-10 16:01:02    新华网

新华社北京12月10日电(记者齐中熙)记者从中国铁建股份有限公司获悉,10日上午,云南大理至瑞丽铁路全线重点控制性工程——怒江四线特大桥钢桁拱顺利合龙,标志着我国“一带一路”中缅国际铁路通道建设取得重大进展。大桥主跨为单跨达490米的钢桁拱,一跨飞越怒江天堑,是目前世界上铁路拱桥的最大跨度。

据中铁十八局集团二公司怒江特大桥项目经理于长彬介绍,大瑞铁路怒江特大桥位于云南省保山市施甸县与龙陵县交界处,全长1024.2米,桥面宽24.9米,设计为四线车站桥,可以允许4列火车同时停靠。全桥用钢量为4.6万吨,主跨的922根单体近100吨不同规格钢杆件,要像搭积木一样,使用80万颗螺栓在距离江面230米的高空悬空拼装组合,工程技术难度和风险国内罕见。

于长彬介绍,怒江特大桥地处云贵高原的峡谷,受环境和地形的限制,怒江车站只能建在桥上。同时受高烈度地震带影响,桥梁的宽度和承载力远远超过普通铁路桥梁,建设这样超大跨度、超大规模的四线车站桥,在世界铁路桥梁史上没有先例。

据悉,全长330公里的大瑞铁路是我国《中长期铁路网规划》完善路网布局的重要项目。建成通车后,大理到瑞丽的行车时间将由现在公路运输的6个小时,缩短到2个多小时,结束云南西部少数民族地区不通火车的历史。

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