| 摘要 |
PURPOSE:To improve the softness of the surrounding ground of hollow piles by a method in which an auger screw is inserted into a hollow pile, excavation is made by jetting air, cement milk is filled into the excavated hole, and the hollow pile is penetrated. CONSTITUTION:An auger screw 2 is inserted into a hollow pile 1 and excavation is made while jetting air from a jet nozzle provided to the tip metal 3. The tip metal 3 is then raised to the tip of the hollow pile 1, and cement milk is packed into the lower layer. When the hollow pile 1 in the closed state is penetrated, the cement milk in the lower layer goes up along a notched shape provided to the tip metal 3 and closely adheres to the periphery of the hollow pile 1. The friction force can reach the most deep portion to enable the pile to be penetrated, and the construction period can be shortened and also the construction work can be economized. |
