Patent ID: 7744057

Claim:
A curved concrete formwork having at least one formwork element, the formwork comprising: a first transverse bolt, said first transverse bolt having a bolt fixture for mounting said first transverse bolt to the formwork element, said first transverse bolt defining at least one first elongated hole and at least one first round hole disposed at a first longitudinal end thereof, said first elongated hole being curved in a shape corresponding to a rounded shape of a concrete wall formed by the concrete formwork; a second transverse bolt, said second transverse bolt defining at least one second elongated hole and at least one second round hole disposed at a second longitudinal end thereof, said second elongated hole being curved in a shape corresponding to the rounded shape of the concrete wall formed by the concrete formwork, wherein said first longitudinal end at least partially overlaps said second longitudinal end, said first elongated hole overlapping said second round hole to define a first bolt duct, and said first round hole overlapping said second elongated hole to define a second bolt duct; a first connecting means disposed within said first duct; a second connecting means disposed within said second duct; and a spindle disposed between and cooperating directly with said first and said second connecting means for adjusting a curvature of the concrete wall.