Abstract: Disclosed is a method comprising: placing a central steel ferrule (2) on a central reinforcement mesh (1); installing around the central ferrule (2) a central assembly (3) and prefabricated pieces (4, 5) comprising a concrete beam (4) and a steel strut (5); assembling (61) sections between the bases (43) of the beams (4), and filling in (62) the central assembly (3); installing formwork (71, 72, 73) around the central assembly (3), the infill (62) and the outer perimeter; and obtaining, by means of simultaneous concreting, a monolithic concrete foundation (10) in which the ends of the struts are embedded, thus forming the ribbed foundation.

Abstract: The system comprises a limited number of equal groups of formwork pieces, each group comprising: —intermediate pieces (1) of constant curvature and width along the entire length thereof and—end pieces (2) forming two symmetrical lateral corners of triangular or trapezoidal outline, with a curvature equal to that of the intermediate pieces. This system allows for forming, with the same groups of pieces, successive formwork segments of varying or constant section for building towers. The invention also includes a building method and the tower thus obtained.

Abstract: The system comprises a limited number of equal groups of formwork pieces, each group comprising: —intermediate pieces (1) of constant curvature and width along the entire length thereof and—end pieces (2) forming two symmetrical lateral corners of triangular or trapezoidal outline, with a curvature equal to that of the intermediate pieces. This system allows for forming, with the same groups of pieces, successive formwork segments of varying or constant section for building towers. The invention also includes a building method and the tower thus obtained.