我们用ZFZ法施工过CFG桩、水泥土桩、二灰桩、灰土桩和碎石桩等体会到,在软弱地基土中采用ZFZ法成桩是经济合理的,并且处理效果非常理想。一、成桩原理ZFZ法是用经改进后的长螺旋钻机,正转成孔、反转挤密成桩的一种方法。螺旋钻叶片正转时,部分土钻出地面,部分土挤到桩间;反转时钻叶将填料送入孔底,钻杆被压密的填料慢慢顶起。钻叶对填料的推力大小与钻尖叶片的导程、钻机 We use the ZFZ method CFG pile construction, cement soil pile, lime pile, lime soil pile and gravel pile and other experience, in the weak foundation soil using ZFZ method into a pile is economical and reasonable, and the treatment effect is very satisfactory. First, the pile principle ZFZ method is to use the improved long auger, is turned into a hole, inverted compaction into a pile. When the auger blade is rotating forward, part of the soil dries out of the ground and part of the soil is squeezed into the pile; during the reverse rotation, the filler material is fed into the bottom of the hole, and the drill rod is slowly pushed up by the compacted filler. Drill the size of the thrust on the filler with the tip of the drill tip, drill