Patent ID: 6896972

Claim:
A round formwork module ( 2 ) comprising a flexible skin ( 4 ) with a front ( 6 ) forming in use the shaping surface for the concrete structure to be cast, and a back ( 8 ), and a support structure ( 10 ) that is disposed on the back ( 8 ) of the skin ( 4 ) and adjustable to permit curvature of the skin ( 4 ) along a direction of extension of the skin ( 4 ), the support structure ( 10 ) having a base structure ( 14 ) and two side elements ( 16 ) disposed laterally beside the base structure ( 14 ) in the direction of curvature, the side elements ( 16 ) each being fastened to a lateral edge area ( 18 ) of the skin ( 4 ), and an adjusting apparatus ( 12 ) being provided between the base structure ( 14 ) and each of the side elements ( 16 ) for adjusting the curvature, wherein the side elements ( 16 ) extend away from the lateral edge area into the proximity of the base structure ( 14 ), and the adjusting apparatus ( 12 ) is connected to the base structure ( 14 ) or the side element ( 16 ) flexibly only on one side.