Abstract: Foundation system for towers, especially for onshore wind turbines, comprising a central shaft buried or partially buried, preferably hollow and formed by dowels made from precast concrete, an essentially flat lower slab and completely buried, and lateral support means in the form of inclined struts that are joined at their upper end with the central shaft and at its lower end with the lower slab, and that are preferably entirely buried. The wind tower is located on the partly buried main shaft. The foundation system may comprise other lower elements connected with the lower slab, such as radial ribs or peripheral beams. The struts are preferably prefabricated elements incorporating an efficient and economical connection system by pre-stressing. The foundation system maximizes the fraction of the weight of the foundation by gravity generated by soil or ballast material, allowing an important economy in the structural materials of the foundation.

Abstract: Floating construction comprising: a flotation base, comprising at least one essentially hollow body selectively fillable with ballast, where the maximum horizontal dimension of the flotation base is greater than the maximum vertical dimension of the floating base; a building supported by said flotation base preferably comprising a telescopic tower; downward impelling means; and at least three retaining cables the corresponding upper ends of which are attached to said flotation base, preferably in peripheral positions of the flotation base, and the corresponding lower ends of which are attached to said downward impelling means, such that said retaining cables are taut and apply a downward force on said flotation base that increases the stability thereof. And the installation method for this floating construction.

Abstract: Cable anchoring means for a horizontal joint between two elements, comprising: a cable partially embedded in an element, a receiving through duct provided in the other element to receive the protruding portion of said cable, traction means, fastening means and a threading device applicable on said protruding portion of said cable and comprising a part with a pointed and flexible geometry that extends coaxially with respect to said protruding portion from the free end of said protruding portion. a cable anchoring procedure for a horizontal joint between two elements, comprising: a) providing said elements; b) providing said anchoring means; c) bringing said elements close to one another and threading said cable into said duct; also comprising the step c): c.1) stopping the approximation when the distance between the elements is adequate; c.2) placing said flexible part inside said duct; c.3) resuming movement.

Abstract: Assembly process of a telescopic tower (100) including at least one prefabricated concrete section, comprising the following steps: providing sections (2,4,6,8,10) in an initial position wherein superimposed sections are disposed coaxially within a base section (10); providing assembly means (14,16,18); providing operator support means (20) on the external surface of said base section (10) essentially vertically in correspondence with the upper edge of said base section (10); lifting the innermost superimposed section (2,4,6,8) radially from those that are in the initial position forming a joint between the lower end portion of said superimposed section (2,4,6,8) which is being lifted and the upper end portion of the radially external and immediately adjacent section (4,6,8,10); providing in said joint anchoring devices for immobilizing at least provisionally the corresponding sections (2,4,6,8,10) between one another.

Abstract: Floating construction comprising: a flotation base including at least one essentially hollow body selectively fillable with ballast, where the maximum horizontal dimension of the flotation base is greater than the maximum vertical dimension of the flotation base; a building supported by said flotation base, comprising preferably a telescopic tower; downward impelling means; and at least three retaining cables, the corresponding upper ends thereof being attached to said flotation base, preferably at peripheral positions of the flotation base, and the corresponding lower ends thereof being attached to said downward impelling means, such that said retaining cables are tensioned and exert on said flotation base a downward force that increases the stability of the floating construction. And the installation method for this floating construction.

Abstract: Floating construction comprising: a flotation base, comprising at least one essentially hollow body selectively fillable with ballast, where the maximum horizontal dimension of the flotation base is greater than the maximum vertical dimension of the floating base; a building supported by said flotation base preferably comprising a telescopic tower; downward impelling means; and at least three retaining cables the corresponding upper ends of which are attached to said flotation base, preferably in peripheral positions of the flotation base, and the corresponding lower ends of which are attached to said downward impelling means, such that said retaining cables are taut and apply a downward force on said flotation base that increases the stability thereof. And the installation method for this floating construction.

Abstract: Process for installing an offshore tower, comprising: a) manufacturing a foundation comprising a block, manufacturing at least one superposition section of a shaft, and manufacturing a base section of a shaft; b) applying said base section to said foundation block (starting unit) to assume the relative position for the installed condition, applying said superposition sections to said starting unit in a multi-layered configuration, and applying lifting means to at least one of said foundation block and said base section; c) moving said starting unit up to the installation point; d) introducing ballast in said foundation block so that said starting unit sinks until resting on the bottom of the body of water; e) actuating said lifting means to expand said sections into the installed condition; f) between step a) and c), placing said foundation block or starting unit in the body of water of the installation point.