| 摘要 |
PURPOSE:To easily treat the head of a concrete pile by a method in which a container filled with an expandible breaking agent is set in such a way as to surround the nearby periphery along the breaking boundary of the pile head, and concrete is placed. CONSTITUTION:A powdery or granular expandible breaking agent 2 is housed in a water-soluble container 1, and the container 1 is set in a netted cylinder 3. The cylinder 3 is set on a place 5-10cm higher than a preset cutting line of an extra-banking concrete and attached to a reinforcing bar cage 4, and concrete is placed. The container 1 is dissolved by excess water in the concrete, and the breaking agent absorbs excess water to generate expanding pressures, whereby bringing out cracks in the preset cutting line of the pile head.
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