Wind turbine generator and construction method for wind turbine tower

Abstract

Provided is a wind turbine generator having a tower structure that can cope with increases in the size and height thereof while avoiding the restrictions of transportation limits. In a wind turbine generator in which a nacelle is installed at a top portion of a monopole type wind turbine tower, in which tower shells having circular cylindrical shapes are connected together, to generate power, the tower is provided with a double-tube structure at least at the bottom end of the tower.

1 . A wind turbine generator in which a nacelle is installed at a top portion of a monopole type wind turbine tower, in which cylindrical tower shells are connected together, to generate power,
 wherein the wind turbine tower is provided with a double-tube structure at least at the bottom end of the tower.   
     
     
         2 . A wind turbine generator according to  claim 1 , wherein the double-tube structure has the tower shell serving as an inner cylinder, an outer cylinder is provided so as to surround the outer circumference of the inner cylinder, and the inner cylinder and the outer cylinder are connected together. 
     
     
         3 . A wind turbine generator according to  claim 2 , wherein the outer cylinder is shaped like a circular truncated cone, which is connected at a top end thereof with an outer circumferential surface of the inner cylinder, and the diameter thereof gradually increases toward a bottom end thereof. 
     
     
         4 . A wind turbine generator according to  claim 2 , wherein the outer cylinder can be divided into a plurality of sections in the circumferential direction and can be transported separately from the inner cylinder. 
     
     
         5 . A wind turbine generator according to  claim 2 , wherein the double-tube structure is provided with a concrete-filled layer in which a space between the inner cylinder and the outer cylinder is filled with concrete. 
     
     
         6 . A wind turbine generator according to  claim 5 , further comprising a protruding portion that protrudes into the concrete-filled layer from wall surfaces of the inner cylinder and the outer cylinder. 
     
     
         7 . A construction method for a wind turbine tower of a wind turbine generator in which a nacelle is installed at a top portion of a monopole type wind turbine tower, in which cylindrical tower shells are connected together, to generate power,
 the wind turbine tower being provided with a double-tube structure in which a space between an inner cylinder and an outer cylinder is filled with concrete at least at the bottom end of the tower,   wherein a tower-shell connecting step, in which the tower shells are connected upward on the double-tube structure, is performed in parallel with a concrete pouring step, in which the double-tube structure is filled with concrete.