Tower production method

A tower production method, characterized by comprising a first production stage, including the steps of:

• unrolling and bringing into a planar state a sheet metal (B) wound around a coil (A),
• bending the planar sheet metal (B) at the lateral direction at varying bending radii (d), creating a bent sheet metal (B′) and
• winding the bent sheet metal (B′) in the form of a conical coil (A′);
• transporting the conical coil (A′) to a site of final production, after the sheet metal (B) is first bent and then wound in the first production stage in the form of a conical coil (A′);
• and a final production stage, including the steps of:
• feeding the bent sheet metal (B′) unwound from the conical coil (A′) to at least one winding machine (8),
• producing a tower (C) by bending and winding the bent sheet metal (B′) in the winding machine (8) around a central bending axis (T) substantially parallel to a wider surface (B1) thereof of the sheet metal so that a defined initial predetermined starting winding radius and the angle between a longer edge (B3) thereof of the bent sheet metal (B′) and the central bending axis (T) are kept substantially constant and a longer edge (B3) of the bent sheet metal (B′) is joined over itself to produce a tower (C) with the other longer edge (B3) of the bent sheet metal (B′).