Installing and Assembling Wind Turbine Towers
Attaching Towers to their Foundations
Tower welding
All pictures Soren Krohn
© 1999 DWIA
Tower welding
Towers are usually bolted onto the concrete foundations on which they are placed.
There are other methods, however, as in this case where part of the bottom section of the tower is cast into the concrete foundation, and where the lowest section of the tower is subsequently welded together directly on the site.
This method requires that the tower be fitted with special guides and clamps to hold the two tower sections in place while the welding is being done. It also requires a small mobile tower factory including a generator, welding gear, and x-ray inspection equipment for checking the welding seams.
 
Flanges
Flanges for wind turbine towers Wind turbine tower sections are bolted together using hot rolled steel flanges, which are welded to the end of each tower section.
The flanges are made from killed steel. The image shows a pair of flanges.
   
Bolt Assembly Bolt assembly on a flange
The next image shows how the tower sections are bolted together inside the tower.
The quality of the flanges and the bolt tensions are important parameters for the safety of wind turbine towers.
© Copyright 1997-2003 Danish Wind Industry Association
Updated 10 May 2003
http://www.windpower.org/en/tour/manu/towrassy.htm
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