A column formwork for use in concrete construction is described, including a planar member 1 constituting the formwork, and at least one connecting section provided for form-fit connecting two opposing edges 3, 3′ of the planar member (1) and thus for constituting a tube segment, wherein at least the connecting-section surface facing the planar member 1 exhibits a substantially constant curvature that substantially corresponds to the curvature of the tube segment.
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