柳西水厂穿越柳江河底的供水管道过河处河床水较深, 横断面呈“U”型,采用整管焊接、防腐、拼装后, 浮运至管槽水面,然后充水下沉安装,施工难度较大。介绍管槽开挖管道防腐、焊接、拼装、浮运就位与注水下沉安装的方法 The Liuxi Water Plant crosses the river at the bottom of the Liujiang River. The river bed is deep and has a U-shaped cross-section. After the entire pipe is welded, preserved, and assembled, it floats to the surface of the tank and is then submerged. , construction is more difficult. Introduce methods for anti-corrosion, welding, assembling, floating in place, and injection submerged installation of pipe trench excavation