| 摘要 |
PROBLEM TO BE SOLVED: To prevent any breakage or detachment of a cap even when a large expansion/contraction force is applied to the concrete. SOLUTION: In an expandable joint 1 with a cap member 3 attached to an upper end of a core 2, a hard portion 21 and a soft portion 22 are overlapped with each other to integrally form the cores 2.
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