泰州大桥北锚碇沉井基础长67.9 m、宽52 m、高57 m，在沉井下沉的初期，采用降排水下沉。降排水下沉施工成本相比不排水下沉低，且下沉效率高，易控制，可形成良好的下沉导向，并确保沉井的下沉速度和精度，适宜在粉细砂、软塑性亚黏土等地质条件下采用。文章以泰州大桥北锚碇沉井基础为例，介绍了超大型沉井降排水施工的降排水下沉施工工艺。

The dimension of the north anchorage of Taizhou Bridge is 67.9 m long, 52 m wide and 57 m high. The water dredging method was adopted at the beginning of the sinking process. The cost of water dredging method is lower than the un drained dredging method and the efficiency is much higher and more controllable. This method can form good sinking direction to assure the sinking velocity and preciseness, especially suitable for the geological condition of clay and clayey. This paper introduced the water dredging construction method of the super scale caisson based on the north anchorage of Taizhou Bridge.

夏国星（1963－），男，江苏泰兴市人，研究员级高级工程师，研究方向：桥梁建设