To provide a plastic form for placing concrete without being deformed by a pressure of the concrete or the like when the concrete is placed, having high construction performance and durability and capable of being recycled.
The plastic form 30 for placing concrete comprises a sheathing board part 32 including a concrete placing surface 31, a side board part 33 curving from each of the side edges of the sheathing board part to the side opposite to the concrete placing surface 31, and a reinforcing board part 35 provided on the rear surface 34 of the concrete placing surface 31. Each of the sheathing board part 32, the side board part 33 and the reinforcing board part 35 is a hollow panel comprising two boards 36 and a plurality of reinforcing ribs connecting the boards to bridge a gap between them. A right-angled rib 41 meets the concrete placing surface 31 at a right angle at a part where the reinforcing rib of the sheathing board part 32 is in contact with the side board part 33 and the reinforcing board part 35. An inclined rib 42, which is inclined with respect to the concrete placing surface 31, is used for the other parts.
TANAKA TOSHIYA
OTSUKA MORIHISA
TAKAGI YOSHIICHI
HOSONO TOSHIHIKO
