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一、灌注桩工法选择灌注桩成孔法,目前主要有四种方法: 1.全套管施工法钻孔时,压入套管保护孔壁,用抓斗将管内土挖出,卸在机器前方或侧方。随孔加深套管不断接长。此法护壁可靠,超挖量小,适于挖掘卵石层,尤其是大卵石碎石层。2.钻孔机旋转取土(1)回转斗:用伸缩式传动杆带动钻斗旋转挖土成孔。钻斗上装有刀片和土斗,装满土斗提出孔外卸土。施工时一般只在表层压下一
First, cast-in-place pile method Select cast-in-place pile-forming method. At present, there are mainly four methods: 1. When drilling with full-casing method, press the casing to protect the wall of the hole, and use the grab to dig the soil out of the pipe and discharge it in front of the machine. Or side. Deepen the casing with the hole deeper. This method has a reliable wall protection and a small amount of excavation. It is suitable for digging pebble layers, especially for large pebble gravel layers. 2. Drilling machine rotates and fetches earth (1) Swinging bucket: Drive the bucket to rotate and dig into holes with a telescopic transmission rod. The bucket is equipped with blades and buckets, filled with soil buckets to raise the hole outside the dumping. When construction is generally only under the surface pressure