Tubular-member flange coupling

Abstract

The production process is shortened and the manufacturing costs are reduced. The present invention is a tubular-member flange coupling ( 8 ) in which a top or bottom end of a circumferential portion is mated to a bottom or top end of a tubular member ( 7 ) to couple the tubular members ( 7 ) to each other. A recess ( 16 ) having a substantially U-shape in cross-section is provided around a circumferential direction in a surface to be connected to the tubular member ( 7 ) at a position radially inward of a surface to be mated to the tubular member ( 7 ).

1 . A tubular-member flange coupling in which a top or bottom end of a circumferential portion is mated to a bottom or top end of a tubular member to couple the tubular members to each other,
 wherein a recess having a substantially U-shape in cross-section is provided around a circumferential direction in a surface to be connected to the tubular member, at a position radially inward of a surface to be mated to the tubular member.   
   
   
       2 . The tubular-member flange coupling according to  claim 1 ,
 wherein the radius of curvature of a radially inward bottom surface of the recess is formed to be smaller than the radius of curvature of a radially outward bottom surface of the recess.   
   
   
       3 . A wind turbine for wind turbine generator comprising the tubular-member flange coupling according to  claim 1 . 
   
   
       4 . A wind turbine for wind turbine generator comprising the tubular-member flange coupling according to  claim 2 .