| 摘要 |
PROBLEM TO BE SOLVED: To provide a plug which is used in a connection method of a precast member and is reused. SOLUTION: A notch part 81 extending from an end surface on the small diameter side to an end surface on the large diameter side is formed on the one side part of an outer peripheral surface of the plug 8. The notch part 81 is divided by a flat surface 81a forming a subtense with respect to a circle constituting the outer peripheral surface of the plug 8. COPYRIGHT: (C)2006,JPO&NCIPI
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