| 摘要 |
PROBLEM TO BE SOLVED: To provide a through hole reinforcing member which hardly causes portions at which the adhesion of deposited concrete is not sufficient, thus preventing the adhesive force from being lowered, is capable of suppressing a shearing crazing (diagonal crazing and tangential crazing) from the initial crazing to the final rupture, and is capable of increasing the strength around a through hole and the deformation performance to provide a high shearing strength. SOLUTION: This through hole reinforcing member comprises a first reinforcing rib 2 formed by bending one or more turns around a center shaft, first reinforcing parts 2c which is so formed on the first reinforcing rib 2 at four positions around the center shaft and the anglesαof which at two positions on both right and left sides of the center shaft are 80 to 98°, respectively, second reinforcing ribs 3 bent one or more turns around the center shaft continuously with the first reinforcing ribs 2, and second reinforcing parts 3c which is so formed on the second reinforcing rib 3 at four positions around the center shaft and the anglesβof which at two positions on both right and left sides of the center shaft are 100 to 120°, respectively. COPYRIGHT: (C)2008,JPO&INPIT
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