| 摘要 |
PURPOSE:To remove negative frictional forces from in-situ piles by a method in which steel plates with frictional force-cutters and bags are alternately set, a reinforcing bar cage having a cylinder with a hollow ring on its lower end is built in the hole, the bag and the hollow ring are expanded, and concrete is placed. CONSTITUTION:Steel plates 17 and bags 18 made of water-stopping nylon sheets are alternately set circularly and a life-bouy shaped hollow ring 19 is provided to the lowest end portion to form a cylinder 16. A frictional force cutter 20 of asphalt, etc., is bonded to the outer surfaces of the steel plates 17 and the inner walls 18 of the bags 18, and a reinforcing bag cage 22 surrounded by the cylinder 16 is built in the excavated hole 23. When water is injected through the opening of the bags 18 to fill them with water, the bags 18 and the rings 19 are expanded and pressingly contacted with the wall of the hole 23. Concrete 24 is then placed and a filling material 25, e.g., sand, etc., is packed into the aperture between the hole 23 and the steel plates 17. |
