| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile head treatment method for a cast-in-place, capable of crushing concrete of an extra-fill part while preventing a broken-out section from being formed in a mountain-shaped section inside a group of main reinforcements even in the case of a large diameter cast-in-place pile, and capable of surely crushing concrete of an extra-fill part positioned outside the group of main reinforcements so as to peel them outward from the group of main reinforcements.SOLUTION: Edge cutting sleeves 5 for preventing adhesion of concrete are fitted to main reinforcements 3 of a pile head; and a plurality of static crushing cartridges 7 constituted by filling water-permeable containers with a hydration expansive crushing agent are circularly arranged along the inner peripheral surface of the group of main reinforcements inside the group of main reinforcements circularly arranged and at a position slightly higher than a pile top end of design, and fixed to the group of main reinforcements. Concrete is placed, in a state that a horizontal breaking auxiliary plate 8 for vertically separating concrete inside the group of main reinforcements is horizontally arranged and fixed to the group of main reinforcements. After the concrete is cured, the hydration expansive crushing agent is made to expand to crush and remove an extra-fill part above the horizontal breaking auxiliary plate. |
