Arch rib is the key point during the process of the long - span concrete - tube arch bridge construction.

主拱肋施工是大跨度钢管混凝土拱桥施工的关键环节.

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In 1928, Freysinet the cantilever concept the springings of the arch rib in the Plougastel Bridge.

在1928年, 弗莱西奈运用悬臂的概念,在德国普鲁加斯泰尔桥修筑了拱桥的起拱部分.

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