To reduce weight and facilitate transportation or assembling and lessen rust caused by rainwater or the like and also lessen deterioration caused by chemicals or the like by cylindrically forming a layered member in which the mutual faces of a plurality of plates made of a fiber reinforced plastic are joined together with a connecting member made of a fiber reinforced plastic.
A layered member 12 constituted of at least two plate members 12a, 12a made of a fiber reinforced plastic(FRP) wherein a reinforcing fiber such as a glass fiber, a carbon fiber, etc., is mixed with a resin such as a phenol resin, an epoxy resin, etc., and connecting members 12b having a corrugated section made by mixing a reinforcing fiber such as a glass fiber, a carbon fiber, etc., with a resin such as a phenol resin, an epoxy resin, etc., likewise to join the plate faces of the plate members 12a, 12a, is cylindrically formed to obtain this structural cylindrical body. A ring-shaped member is fixed to the inside face of the structural body by adhesion or the like, as a means to supplement adhesion to concrete when concrete is placed in the inside.
KAWAI KEITA
AZUMA KATSUHIRO
