| 摘要 |
PURPOSE:To form a pile according to the varied properties of soil by a method in which the variation in the current of a drive motor with the driving depths when penetrating a casing is detected to judge the properties of soil, and the pulling speed of the casing and the discharge amount of plural improving agents are controlled. CONSTITUTION:A cement material is charged into the hopper 5 of a driver 1, and quick lime material is charged into another hopper 6. A driver 2 is operated, a casing 4 is penetrated into the ground, and the variations in current of drive motors 8 and 9 and driving depths are recorded on an automatic recorder 22 by a depth detector 17 and a current converter 21. The thickness of a banking 25, a peat layer 20, a sandy layer 27, and a silt layer 28 is detected and the kinds and amounts of an improving agent to be charged are determined. For the slit layer 28, quick lime material is charged in an amount corresponding to 4m, and for the sand layer 27, cement material is charged in an amount corresponding to 2m. Also, for the peat layer 26, a great amount of improving agent is added to form an expanded diameter pile 30. |
