| 摘要 |
PROBLEM TO BE SOLVED: To provide a new sleeve for a void, by which pre-working such as cutting in fixed size is made unnecessary because a molded form is only used as it is in the case of construction works, which is set simply into forms in the case of concrete placing and can be extracted simply and rapidly after concrete placing and in which the treatment of waste is hardly troubled because the sleeve can be used repeatedly. SOLUTION: In the sleeve for the void used for forming a hollow space to a concrete structure, the sleeve is composed of a plastic cylindrical body in fixed wall thickness, and the plastic cylindrical body has a tapered taper in the longitudinal direction of the cylindrical body.
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