3.3 Tower
The tower of the E-82 E4 wind energy converter is either a steel tower or a concrete tower made of
precast segments. Towers with different heights are available.
All towers are painted and equipped with weather and corrosion protection at the factory. This
means that no work is required in this regard after assembly except for repairing any defects or
transport damage. By default, the bottom of the tower comes with graduated paintwork (can be dis‐
pensed with if desired).
Steel towers are steel tubes that taper linearly towards the top. They are prefabricated and consist
of a small number of large sections. Flanges with drill holes for bolting are welded to the ends of
the sections.
The tower sections are simply stacked on top of each other and bolted together at the installation
site. They are linked to the foundation by means of a bolt cage.
The concrete tower is assembled from the precast concrete elements at the installation site. As a
rule, segments are dry-stacked; however, a compensatory grout layer can be applied. Vertical
joints are closed by means of bolt connections.
Towers are prestressed vertically by means of prestressing steel tendons. The prestressing ten‐
dons run externally along the interior tower wall. They are anchored to the foundation.
For technical and financial reasons, the top slender part of the E-82 E4 concrete tower is made of
steel. For instance, installing the yaw bearing directly on the concrete elements is unfeasible, and
the considerably thinner wall of the steel section provides for more space in the tower interior.
E-82 E4 components
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