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

软管水面穿具有铺设迅速,检修方便,容易掌握和使用等优点,尤其是对于不通航,是软质机动管线临时穿的首选方式。

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).

上墩柱整体预制吊装在我国第一桥梁东大桥非通航段施工中得以研究和全面应用。