Process and unit for the attachment of a wind turbine's tower to a foundation and wind turbine incorporating said unit

Abstract

The invention describes a process and a unit, both enabling to attach a wind turbine tower to a foundation, as well as describes also a wind turbine incorporating the unit. The process features a stage of installation of a support element for the transmission of stresses from the tower to the foundation, followed by a stage of leveling the support element and pouring foundation concrete up to the support element's lower side so that the lower side is adhered to the poured concrete once it has set. The unit comprises at least one support element.

Description

OBJECT OF THE INVENTION[0001]The object of the invention is a process enabling the attachment of a wind turbine tower to a foundation, as well as the attachment unit enabling the aforementioned attachment between the tower and the foundation, and the wind turbine itself which incorporates said attachment unit.BACKGROUND OF THE INVENTION[0002]The objective of wind energy is to generate electricity from the wind through wind turbines with the maximum possible efficiency and the minimum cost. The most spread configurations of wind turbines imply the use of one tower for the installation of the rotor at some predetermined elevation relative to the ground.[0003]These towers are designed to withstand the set of reactions generated as a consequence of the loads to which both the wind turbine's rotor and the nacelle are subjected. The ideal position of the rotor to prevent the ground effect together with the blade diameters cause the optimal height at which it should be placed to increase a...

AI Technical Summary

Problems solved by technology

Other disadvantages are the additional setting time that is implied by the use of grout, which increases the tower's construction time, as well as the influence of climatological conditions on the grout's setting time and also on the quality of the grout itself and, therefore, on the quality of the connection or even on the impossibility to be able to pour the grout.

Finally, another disadvantage of the use of grout are the associated quality problems, since the quality of the grout's seal is critical and difficult to control and even to unify for each wind turbine, since it depends, in addition to the climatological conditions previously discussed, on the experience of the workers or the existence of bubbles inside the grout which weaken the mix and which may appear as a consequence of a variation of the direction and speed of the grout in each area throughout the surface with regards to previous calculations, these parameters being difficult to control as they are affected by numerous variables.

In the first attachment method of a tower to the foundation known in the state of the art and described above, there is an additional given disadvantage: since the stage of leveling is applied to the tower's first section, it is necessary to use a high tonnage crane to move the first section during the leveling stage, thereby incurring in additional installation costs and the possibility of a damage to the components.

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