Transport of a tower of a wind turbine
The disclosed concerns a method of transporting a tower of a wind turbine in an upright position to an assembly site of the wind turbine, whereby the tower is equipped with a strake set comprising a number of strakes positioned to lead from a top of the tower in the upright position down towards a bottom of the tower, at least one of the strakes being realized as a detachable strake. The invention also concerns a strake set and transport assembly.
1. A strake set for the external surface of a tower of a wind turbine for transport in an upright position to an assembly site of the wind turbine, comprising:
a number of independently adjustable strakes, wherein at least one of the strakes has a helicity which is adjustable when the strake is attached to the tower of a wind turbine at at least one point;
wherein at least one of the independently adjustable strakes includes a rope, wherein the rope is covered along at least a substantial part of its longitudinal extension with a covering structure which substantially increases the wind resistance of the strake, and the covering structure is not directly attached to the tower and is not directly attached to the rope.
2. The strake set according to claim 1 , wherein the covering structure may move with respect to the rope.
3. The strake set according to claim 1 , wherein the covering structure is comprised of individual sections.
4. The strake set according to claim 1 , wherein the portion of the rope covered with the covering structure is a distance sufficient to cover a quarter of a height of the tower.
5. The strake set according to claim 1 , wherein the covering structure has a cross-sectional shape with reference to the longitudinal extension of the strake, the cross-sectional shape comprising a geometrical figure with at least three angles.
6. The strake set according to claim 5 , wherein the geometrical figure comprises a number of planes interconnecting the angles, each of the number of planes having essentially a same extension in the cross-section.
7. The strake set according to claim 5 , wherein the covering structure is assembled about the rope over a mechanical reinforcement structure, the mechanical reinforcement structure configured to support the covering structure in the geometrical figure.
8. The strake set according to claim 1 , wherein the covering structure leaves at least one terminating portion of the rope uncovered.
9. The strake set according to claim 1 , wherein the covering structure comprises a flexible film material.
10. The strake set according to claim 2 wherein the rope comprises a fibre material.
11. A turbine tower equipped with a strake set according to claim 1 .