| 摘要 |
PROBLEM TO BE SOLVED: To reduce costs and suppress the noise generated in chipping by saving labor in cast-in-place concrete pile head treatment work. SOLUTION: After placing concrete for the cast-in-place concrete pile, a jig attached with a grid inside near the bottom of a cylindrical shell having a diameter of 50% to 75% of the pile diameter is sunk from the upper portion of concrete to the inside of concrete before hardening thereby making many vertical cuts in the concrete.
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