Abstract: A rigid self-supporting hollow body (1) having large dimensions and intended for building constructions, wherein the body is of the type including a thin wall (4) having a generally cylindrical shape relative to an axis (5) and two end flanges (6) oriented towards the outside, defining an integral assembly having an inner hollow space (7) with two end openings (8), made of a coating and resistance material containing concrete or the like and reinforced with fibres. The flanges (6) include or define fastening elements (15) that enable, using fastening members (6), the rigid fastening on one and/or the other flanges (6) of the body, of an adjacent flange (6) of a second similar neighbouring body (1) and/or of a blocking wall (3) optionally including one or more openings (3a) so as to build constructions in a modular and flexible manner.

Abstract: A flange (6) intended to be part of a self-supporting rigid hollow body having large dimensions and intended for building constructions, including a thin wall (4) having a generally cylindrical shape relative to an axis, made of a coating and resistance material containing concrete or the like and reinforced with fibres, and two such end flanges (6) oriented towards the outside. The flange includes a main portion (9) generally shaped as a flattened hollow cylinder and visible in the body upon completion and a talon (10) extending in an axial direction from a transverse face (11) of the main portion and having inner radial overall dimensions equal to or close to the inner radial overall dimensions of the main portion, and outer radial overall dimensions lower than the outer radial overall dimensions of the main portion. A method and equipment for making such a hollow body using such flanges are also described.