Its equipment and construction methods of soil-cement composite pile

摘要

PURPOSE:To easily and exactly attain construction work by using an auger head provided to the tip of an auger rod, consisting of an excavation blade whose outside diameter is smaller than the inside diameter of a hollow tube, a jet port for a hardener, and a reversely turning excavation blade to be coupled with the lower end of the hollow tube. CONSTITUTION:An auger rod 2 is inserted into a hollow tube 1 under a condition that an auger head 20 is precedently set, and the upper ends of the rod 2 and the tube 1 are coupled to each operating machine. The rod 2 and the tube 1 are turned mutually to opposite directions, the reversely turning excavation blade 5 is opened and turned with the rotation of the tube 1, and a hardener is discharged from a jet port 10. The ground is excavated to a given depth while being stirred. The hardener is then switched to a hardener having a greater compressive strength to form the foot-protected portion 15a of the pit bottom. The tube 1 is fixed, and the rod 2 is pulled up. The blade 5 is closed to remove it to the ground's surface, and the tube 1 is penetrated into the portion 15a to make up a soil cement composite pile 17, The construction work can thus be easily attained by uniform mixing without co-rotation of these parts.