Butt joint for hollow profiles

Abstract

A butt connection of divided hollow profile members, which is suitable in particular for rotor blades of wind power installations, comprises a multiplicity of straps which are arranged along the join and which bridge over same and which are respectively fixed with their ends to one of the profile members to be connected. In this respect the arrangement is preferably such that one of the two bolts fixing the strap at the ends thereof has a wedge-shaped flattening, by means of which a tensile prestressing can be imparted to the strap.

1 . A butt connection for divided hollow profile members, in particular for rotor blades of wind power installations, characterised by a multiplicity of straps ( 5 ) which are arranged along the join ( 2 ) and which bridge over same and which are respectively fixed with their ends to one of the profile members parts ( 1   a ,  1   b ) to be connected.  
     
     
         2 . A butt connection as set forth in  claim 1  for transversely divided hollow profile members of non-round cross-section characterised in that the straps ( 5 ) are arranged at the periphery of the hollow profile member ( 1 ).  
     
     
         3 . A butt connection as set forth in  claim 1  or  claim 2  characterised in that the density of arrangement (proximity) of the straps ( 5 ) along the join ( 2 ) is different in dependence on the tensile forces to be transmitted at the join ( 2 ).  
     
     
         4 . A butt connection as set forth in one of  claims 1  to  3  characterised in that there are respectively provided double straps with a respective strap ( 5 ) arranged on the outside and on the inside of the hollow profile member ( 1 ).  
     
     
         5 . A butt connection as set forth in one of the preceding claims characterised in that each strap ( 5 ) or double strap can be prestressed with a defined tensile force.  
     
     
         6 . A butt connection as set forth in  claim 5  characterised in that the straps ( 5 ) are fixed to the profile member parts ( 1   a ,  1   b ) by means of two bolts ( 6   a ,  6   b ) and at least one of the bolts ( 6   a ) in the contact regions with the straps ( 5 ) has a wedge-shaped flattening ( 10 ) in its axial direction and is held non-rotatably.  
     
     
         7 . A butt connection as set forth in  claim 4  and  claim 6  characterised in that the bolt ( 6   a ) comprises a sleeve provided with the wedge-shaped flattenings ( 10 ) and a screw ( 8 ) with nut ( 9 ), which passes axially through the sleeve, wherein both the screw head and also the nut press by means of cup-shaped pressure portions ( 12 ) against the associated strap ( 5 ) and prestress same by movement along the wedge surface.  
     
     
         8 . A butt connection as set forth in  claim 5  characterised in that the straps ( 5 ) are fixed to the profile member parts ( 1   a ,  1   b ) by means of two bolts ( 6 ) and at least one of the bolts respectively has in the contact regions with the straps ( 5 ) a bulge which is eccentric with respect to the axis thereof.