苏通大桥是我国在长江河口地区建设的世界首座跨径超千米的斜拉桥，主塔基础位于深水潮汐急流河段，采用钻孔灌注桩群桩基础，是规模最大的群桩基础。对于深水急流条件下的群桩基础，为承台提供施工条件的钢吊箱的高精度施工是一个关键难题。从沉放方案选择、结构方案设计、制作和安装、整体沉放工艺、同步性控制及定位等方面阐述了苏通大桥主塔基础5 800 t钢吊箱的整体沉放技术与工艺。其中，将钻孔桩施工平台与钢吊箱底板结合的结构方案和钢吊箱整体沉放工艺、同步性控制和定位技术具有明显的创新性。

Sutong Bridge is the first cable stayed bridge with the span exceeds 1 000 m which located in the mouth of Yangtze River. Its pylon foundation located in the river where the water is deep and current speed is high, and adopted the bored group piles foundation which is the largest group piles foundation. To the group piles foundation with the construction condition of deep water and high speed current, the exactly construction of the steel cofferdam which provided dry condition for the pile caps construction is a problem. This paper discussed the lowering as a whole technology of Sutong Bridge 5 800 t weigh steel cofferdam from 6 respects such as selection of lowering scheme, design, fabrication, lowering techniques, synchronousness controlling and orientation. In which, the design combined the coping of bored piles construction platform with bottom of steel cofferdam, the lowering as a whole techniques, synchronousness controlling and orientation technology are innovation.

张雄文（1976－），男，湖北天门市人，江苏省苏通大桥建设指挥部工程师，研究方向为桥梁工程