在钻孔桩桩基施工中,因受各种因素的制约,极易引起断桩事故,对整个工程的工期和成本带来直接的影响。在S04立交桥处理断桩施工中,通过运用圆台形套筒逐步下沉方法,取得了良好的实际效果。本文举例介绍了圆台形套筒逐步下沉法在断桩处理中的具体应用和注意事项。 In the construction of bored pile foundation, due to the constraints of various factors, it can easily lead to stumpage accident, which will have a direct impact on the construction period and cost of the whole project. In S04 overpass treatment of broken pile construction, through the use of round table sleeve gradually sinking method, and achieved good practical results. This paper gives an example to introduce the concrete application and precautions of the step-down method of the truncated cone in the broken pile processing.