| 摘要 |
PROBLEM TO BE SOLVED: To provide a forming tool wherein an inverse-draft hole can be formed on a product formed by a rigid concrete shuttering. SOLUTION: For the molding tool 2 to form the inverse draft hole 4 on the product 3 by being attached to or detached from a concrete shuttering 2 formed by a rigid material, the molding tool 1 is equipped with a main body 5 wherein a part or the whole of a peripheral surface is formed fanwise by a material capable of being shrinked or expanded, and a core material 6 which is buried inside the main body 5 and enables the main body 5 to be fixed to a shuttering 2, to be prevented from deformation owing to filling concrete and to be extracted from the product 3.
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