Wind turbine tower

Abstract

A wind turbine tower is made of reinforced concrete with fibre rovings as reinforcements. The fibre rovings may include, for example, glass fibre rovings, or armid fibre rovings, or carbon fibre rovings. The fibre rovings may comprise, for example, a bundle of multiple parallel oriented fibers forming a thin rope.

1 . A wind turbine tower comprising,
 reinforced concrete with fibre rovings as reinforcements.   
     
     
         2 . The wind turbine tower according to  claim 1 , wherein the fibre rovings are glass fibre rovings, armid fibre rovings, or carbon fibre rovings. 
     
     
         3 . The wind turbine tower according to  claim 1 , wherein the fibre rovings is a bundle of multiple parallel oriented fibers. 
     
     
         4 . The wind turbine tower according to  claim 3 , wherein the fibre rovings are carbon fibre rovings, and wherein
 the carbon fibre diameter is in the range of 5 μm to 10 μm, and/or   the number of carbon fibres in the roving is between 5000 and 30000, and/or   the glass fibre diameter is in the range between 10 μm and 30 μm, and/or   the number of glass fibres in the roving is between 500 and 2000, and/or   the fibre roving weight is between 0.20 and 30 kg/km.   
     
     
         5 . The wind turbine tower according to  claim 1 , wherein
 the tower is produced in a slip forming process or slip moulding process,   the fibre rovings are embedded in the concrete during the slip forming process.   
     
     
         6 . The wind turbine tower according to  claim 1 , wherein the fibre rovings are anchored in the concrete already at the bottom of the wind turbine tower and it ends at the top of the wind turbine tower. 
     
     
         7 . The wind turbine tower according to  claim 1 , wherein at least some of the fibre rovings are wound around the wind turbine tower in a first angle relative to the longitudinal axis of the tower. 
     
     
         8 . The wind turbine tower according to  claim 7 , wherein said first angle is an angle of ±25 degree. 
     
     
         9 . The wind turbine tower according to  claim 1 , wherein at least some of the fibre rovings are wound around the wind turbine tower in a second angle relative to the longitudinal axis of the tower. 
     
     
         10 . The wind turbine tower according to  claim 9 , wherein said second angle is ±85 degree, so that the fibre rovings generally follow the circumference of the tower. 
     
     
         11 . The wind turbine tower according  claim 1 , wherein at least some of the fibre rovings are placed in the concrete in a zero degree angle relative to the longitudinal axis of the tower. 
     
     
         12 . The wind turbine tower according to  claim 1 , wherein
 at the top of the tower, the tower adapts to either a yaw-construction or to some transition piece between the tower and the yaw-construction, and   
       fibre rovings are placed in paths in order to cope with the intensive tensions and stresses which act on this part of the tower. 
     
     
         13 . The wind turbine tower according  claim 1 , wherein the fibre rovings are pre-tensioned when placed in the concrete during the slip moulding process in order not to create any wrinkles on the fibre rovings or to stabilise the tower. 
     
     
         14 . The wind turbine tower according to  claim 1 , wherein the fibre rovings are configured to be embedded as a supplement to conventional iron bar reinforcement, or the conventional iron bar reinforcement is configured to be embedded as a supplement to the fibre rovings.