| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forming a fitting hole of a concrete molded article and a male mold wherein a fitting hole into which a hooking part provided on the side end of an elastic seal material is inserted in a concrete molded article such as a side water path, a box culvert, a retaining wall and an exterior wall panel is highly accurately formed and deviation on the fitting posture of a male mold main body is not generated and elastic recovery is rich and the life can be extended and maintenance and control are easily performed in relation to the method for forming the fitting hole of the concrete molded article and the male mold. SOLUTION: A hollow projected part 7b formed on the apex of a male mold main body 7 which is formed of an elastic material such as a rubber and can be fitted at a required position in a form 1 is expanded by making a pressurized fluid L flow thereinto when concrete is filled and the pressurized fluid L is made to flow out to reduce the pressure when the concrete is aged and solidified and in addition, when the concrete molded article is released from the mold, it is shrunk by making the pressurized fluid flow out to form the concrete molded article A with a highly accurate fitting hole.
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