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    • 6. 发明专利
    • MANUFACTURE OF HALF PCA PLATE
    • JPH01176509A
    • 1989-07-12
    • JP33551687
    • 1987-12-29
    • TOKYU KENSETSU KKSUZUKI KAZUO
    • SUZUKI KAZUOSAITO SHUNZOYAMAMOTO TOSHIHIKOTORII HIROSHI
    • B28B7/16B28B23/04E04B5/02E04B5/38
    • PURPOSE:To manufacture a half PCa plate with cotters simply and quickly by placing concrete in a formwork with a number of cotters disposed on the surface of its bottom formwork and lifting up and releasing the concrete from the frame after curing the concrete. CONSTITUTION:A bottom formwork 1a is so formed as to be lowered gradually toward the central section into a deformed section shape such as a parabolic shape, inclined straight line shape or the like, and a number of cotter types 2 are disposed on its surface. The cotter types 2 are formed of an elastic material or the like such as vulcanite or the like and relaxes the stress or the like generated by the shrinking force at the time of hardening concrete or giving prestress, and also prevents the cotter types 2 from being cut out or getting damaged at the time of releasing. A surrounding frame 1b is formed by disposing in tension prestress introducing wires 3 such as reinforcing bars of regular strength, reinforcing bars of high strength or a carbon fiber material or the like between the surrounding formworks 1b formed integrally and facing each other. Concrete 4 is placed in the formwork 1 in said state, and is lifted up and released from the formwork 1 when the concrete 4 is hardened.