Therefore, the water-surface crossing with mobile flexible pipelines is often adopted and it is a first choice to cross an innavigable river.

软管水面穿越河流具有铺设迅速,检修方便,容和使用等优点,尤其是对于不通航河流,是软质机动管线临时穿越河流的首选方式。

The technique of pier integral precasting at the sea was researched and applied in the innavigable section construction of Donghai Bridge(the first bridge at the sea in China).

海整体预制吊装在我国第一座外海桥梁东海大桥非通航段施工中得以研究和全面应用。