本文是702长江大桥在深水几种不同地质条件下采用双壁钢围堰钻孔基础的初步总结。它是一种好的新施工方法。过去在长江上修建基础均受施工水位的限制,因而工期较长,而新施工方法基本上不受施工水位变化的限制,在简化施工工序、缩短工期方面有了新的突破,达到了在长江上仅用一年甚至更短的时间可修建一个基础的新水平。同时此新施工方法的结构简单,基础结构布置比较合理。 This paper is a preliminary summary of the drilling foundation of the double-wall steel cofferdam of 702 Yangtze River Bridge under different geological conditions in deep water. It is a good new construction method. In the past, the construction foundation on the Yangtze River was limited by the construction water level, so the construction period was longer. However, the new construction method was basically not limited by the change of construction water level. New breakthroughs were made in simplifying the construction process and shortening the construction period, In just one year or even less time to build a new level of foundation. At the same time, the structure of this new construction method is simple and the layout of the basic structure is reasonable.