| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that construction precision is low when a conventional concrete block fixes and supports PC steel rods at a prescribed position in a concrete building frame, cracking due to strength insufficiency and breakage are easy to occur and the reliability of quality is inferior because the conventional concrete block is composed of coarse mortar cement. SOLUTION: A block body is composed of a concrete-based, polymer concrete-based or polymer cement mortar-based material, and the reliability of quality can be improved. The cracking and breakage of a block body can be prevented because the concentrated load of the steel rod can be distributed by an embedded plate formed at the center of the circular upper face of the block body, the block body has high strength as compared with a conventional one. The improvement of construction precision and remarkable saving of labor of complicated positioning work can be performed by providing a marking marker at the prescribed position of the block body. Because the block body is trapezoidal, the occurrence of honeycomb in concrete placing and the occurrence of the deviation of a steel rod position can be prevented. COPYRIGHT: (C)2004,JPO
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