拉林铁路藏木雅鲁藏布江特大桥主拱施工技术研究

Construction Technology Research on the Main Span of the Brahmaputra Extra-large Bridge in Nyingchi-Lhasa Railway

藏木雅鲁藏布江双线特大桥主跨采用430 m 中承式钢管混凝土提篮拱，施工场地狭窄，大临设施布置难度大；拱座基坑开挖支护及止水难度大。缆索吊机跨度达到440 m，吊装重量大，缆扣塔高达180 m，扣锚索荷载大，主拱应力及线形施工控制难度大。对现场及结构深入了解和熟悉，采取各种施工技术措施，有效地解决了上述施工难题。

The main span of Brahmaputra Extra-large Bridge adopts a half-through steel tube concrete handle-basket arch with a length of 430 m,the construction site is narrow and the layout of large temporary facilities is difficult.The excavation supporting and water-sealing are difficult,the span of cable crane is up to 440 m,with great weight lifting,and the cable tower is as high as 180 m,with big buckle anchor load,so the main arch stress and linear construction control is difficult. On the basis of a deep understanding and familiar with the site and structure,all kinds of construction technical measures are taken to effectively solve the construction problems of the above.