| 摘要 |
PURPOSE:To remove negative frictional forces by a method in which a steel tube 3 whose peripheral wall is adhered with a lubricant, having a diameter larger than a concrete pile driven into the ground, is inserted into the concrete pile. CONSTITUTION:An in-situ concrete pile 2 is driven into the ground 1, and a steel tube 3 whose peripheral wall 4 is coated with a lubricant 5 (e.g., asphalt or grease), having a larger diameter than the pile 2, is inserted into the pile 2. Since the pile 2 and the tube 3 are in a state of being isolated from frictional forces by the lubricant 5 when the subsidence of the ground 1 occurs, no negative frictional force acts on the pile 2. |
