Abstract: A system for assembling a tower for a wind generator having a succession of subsections (Si). The system including: a plurality of lifting legs, a lifting structure vertically movable on the lifting legs, the lifting structure including a rigid lifting frame for holding the tower under assembly, the lifting frame including load transfer members and the lifting structure including self-climbing mechanisms interacting between the load transfer members and the lifting legs for elevating or lowering the lifting structure, and at least a first set of gripping arms movable relative to the lifting frame between a retracted configuration and a gripping configuration.

Abstract: A wind turbine tower including a plurality of annular segments axially aligned with each other, at least one of the annular segments having a plurality of assembled sectors made of precast concrete, adjacent sectors of this segment being assembled by clamping devices and the segment comprising at the interface of adjacent sectors shear keys cast with the sectors.

Abstract: A method for constructing a wind turbine concrete floater including a central connector from which radial arms extend, the central connector carrying a central stability tower, and each arm carrying an outer stability tower. The method includes prefabricating the arms, central connector and at least parts of the stability towers, pre-assembling the central connector with one arm to form a primary pre-assembly, mounting temporary flotation devices onto the arms to provide additional buoyancy to them, floating the primary preassembly and floating the other arms of the floater, and assembling offshore said primary preassembly with said other arms.

Abstract: A system for assembling a tower for a wind generator having a succession of subsections (Si). The system including: a plurality of lifting legs, a lifting structure vertically movable on the lifting legs, the lifting structure including a rigid lifting frame for holding the tower under assembly, the lifting frame including load transfer members and the lifting structure including self-climbing mechanisms interacting between the load transfer members and the lifting legs for elevating or lowering the lifting structure, and at least a first set of gripping arms movable relative to the lifting frame between a retracted configuration and a gripping configuration.

Abstract: A floatable structure in particular a floatable platform including at least two separate hulls each having a longitudinal axis. Each hull having along the longitudinal axis a succession of hollow concrete segments.

Abstract: A system for holding a tubular sleeve (2) in a receiving structure during setting of a cement or other binder introduced in a fluid state between the sleeve (2) and the receiving structure, comprising:—at least one expandable structure (4) mounted on the sleeve (2), deformable from an inactive configuration allowing insertion of the sleeve (2) in the receiving structure to an active configuration immobilizing the sleeve (2) in the receiving structure,—at least one corresponding tool to be inserted in the sleeve (2), configured for acting on the expandable structure (4) to cause it to pass from the inactive configuration to the active configuration.

Abstract: A method of manufacturing precast concrete segments destined to form all or part of a tower (2), the segments being destined to be superimposed within the tower. The method comprises, for at least a first segment and a second segment destined to be adjacent in the tower, the first segment being destined to be located beneath the second segment, forming said first and second segments using at least one mould comprising a first portion (Ti) and a second portion (Bi) respectively configured to define all or part of an upper face, respectively a lower face of the segment formed therein, the first portion of the mould used for forming the first segment and the second portion (Bi) of the mould (Mi) used for forming the second segment exhibiting respective geometries of complementary shapes.

Abstract: A system for holding a tubular sleeve (2) in a receiving structure during setting of a cement or other binder introduced in a fluid state between the sleeve (2) and the receiving structure, comprising: —at least one expandable structure (4) mounted on the sleeve (2), deformable from an inactive configuration allowing insertion of the sleeve (2) in the receiving structure to an active configuration immobilizing the sleeve (2) in the receiving structure, —at least one corresponding tool to be inserted in the sleeve (2), configured for acting on the expandable structure (4) to cause it to pass from the inactive configuration to the active configuration.

Abstract: A contribution is made to the assembly of a wind turbine intended to comprise, in a final assembly condition, a tower (2) surmounted by a nacelle (4) cooperating with a rotor (5) receiving a plurality of blades (3a-3c). To this end, a temporary association is made between at least some blades from said plurality of blades and the tower, so that said blades extend substantially in the longitudinal direction of the tower.

Abstract: A contribution is made to the assembly of a wind turbine intended to comprise, in a final assembly condition, a tower (2) surmounted by a nacelle (4) cooperating with a rotor (5) receiving a plurality of blades (3a-3c). To this end, a temporary association is made between at least some blades from said plurality of blades and the tower, so that said blades extend substantially in the longitudinal direction of the tower.

Abstract: A contribution is made to the assembly of a wind turbine intended to comprise, in a final assembly condition, a tower (2) surmounted by a nacelle (4) cooperating with a rotor (5) receiving a plurality of blades (3a-3c). To this end, a temporary association is made between at least some blades from said plurality of blades and the tower, so that said blades extend substantially in the longitudinal direction of the tower.

Abstract: A method for transporting a civil engineering structure including a mast in an aquatic medium is presented. In an embodiment, the method includes fastening the civil engineering structure to at least one flotation unit, moving the civil engineering structure and the connected flotation unit in the aquatic medium as far as a desired position. The civil engineering structure may be fastened to the flotation unit in a region situated above the center of equilibrium of the civil engineering structure connected to the flotation unit. The connection may be configured to uncouple the rotational movements of the flotation unit and of the civil engineering structure about at least one axis perpendicular to the longitudinal axis of the mast of the civil engineering structure.

Abstract: A method of construction of a civil engineering structure that includes first and second superimposed components is described. According to one embodiment of the method: the second component is positioned beneath a fixed lifting structure that includes a lifting device, the second component is lifted using the lifting device, the first component is positioned beneath the fixed lifting structure substantially below the second component, and the second component is substantially placed on the first component using the lifting device, while the second component remains substantially in place.

Abstract: The invention relates to a method for transporting a civil engineering structure (1) comprising a mast (3) in an aquatic medium, the method comprising the following steps: associating the civil engineering structure (1) with at least one buoyancy unit (2) by a fastening means (10), moving the civil engineering structure (1) and the associated buoyancy unit (2) in the aquatic medium as far as a desired position, the fastening means (10) being located in a region of the civil engineering structure (1) that is situated above the centre of equilibrium of said civil engineering structure (1) associated with the buoyancy unit (2), and fastening means (10) being configured so as to uncouple the rotational movements of the buoyancy unit (2) and of the civil engineering structure (1) about at least one axis perpendicular to the longitudinal axis of the mast (3) of the civil engineering structure (1).

Abstract: The invention provides a method for the transport of a civil engineering structure in an aquatic medium. According to this method: at least one float is associated with the civil engineering structure in such a way as to ensure that the said civil engineering structure floats stably in an aquatic medium, the said float surrounding the civil engineering structure and a bottom portion of the civil engineering structure extending below the said float, and the civil engineering structure and the associated float are caused to move in the aquatic medium to a desired position.

Abstract: A contribution is made to the assembly of a wind turbine intended to comprise, in a final assembly condition, a tower (2) surmounted by a nacelle (4) cooperating with a rotor (5) receiving a plurality of blades (3a-3c). To this end, a temporary association is made between at least some blades from said plurality of blades and the tower, so that said blades extend substantially in the longitudinal direction of the tower.

Abstract: The invention provides a method for the construction of a civil engineering structure comprising first and second superimposed components. According to this method: the second component is positioned beneath a fixed lifting structure comprising lifting means, the second component is lifted using the lifting means, the first component is positioned beneath the fixed lifting structure substantially below the second component, and the second component is substantially placed on the first component using the lifting means.

Abstract: The invention provides a method for the transport of a civil engineering structure in an aquatic medium. According to this method: at least one float is associated with the civil engineering structure in such a way as to ensure that the said civil engineering structure floats stably in an aquatic medium, the said float surrounding the civil engineering structure and a bottom portion of the civil engineering structure extending below the said float, and the civil engineering structure and the associated float are caused to move in the aquatic medium to a desired position.

Abstract: The metal girder element (5, 6) possesses a section of web (7, 10) fixed along its longitudinal edges respectively to a section of upper flange (8) and to a section of lower flange (9). Each section of flange (8, 9) of this element (1, 2) possesses, on its outer surface opposite the web (7, 10), connection elements (12, 13), the number, dimensions and positions of which are predetermined in such a way that said connection elements (12, 13) are capable of supporting the driving stresses of said section of flange (8, 9) via the concrete during the designed deformations of the structure thus formed.