双向螺旋挤土灌注桩（SDS）的技术优势与施工问题研究

双向螺旋挤土灌注桩（SDS）技术是在CFG地基处理的基础上通过对钻头的改进，减少出土量，充分发挥桩间土的承载力，进而减少混凝土用量。首先从设备上的关键结构来说明其工作原理；再通过已完成的工程实例与传统工艺相比较来佐证SDS技术的技术和经济优势；最后针对施工过程中出现的问题，分析其原因和提出处理措施。

Technical Advantages of Soil Displacement Screw Pile and the Study on Construction Problem

Soil displacement screw pile (SDS) has been developed on the basis of CFG foundation treatment technology and by the bit improvement, which can reduce the volume of excavated earth and give full play to the bearing capacity of soil between piles to further cut the amount of concrete. The paper first illustrates its working principle of the key structure of the device; then compares the completed project example with traditional process to prove the technical and economic advantages of SDS technology and finally aiming at the produced problems in the process of construction, analyzes the causes and puts forward the treatment measures.