| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold structure which allows removal of an inner peripheral mold with a relatively simple operation applying no draft on its inside wall in manufacturing a bottomed concrete pit at a workshop. SOLUTION: The technical means to solve the problem comprises: putting an open face of the concrete pit downside to make the face should be installed on a working table that may be square shaped in the case of a square pit, preparing a peripheral mold strip opening and closing with a hinge in each side, and setting an inner peripheral mold with a draft upright near the center of the working table; and in addition, detachably putting a bag on the inner peripheral mold, wherein the bag is composed of a flexible material such as rubber and maybe in cube (or rectangular parallelepiped) shape with its inner periphery fitting to the draft of the inner peripheral mold and its outer periphery having no draft. COPYRIGHT: (C)2008,JPO&INPIT
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