Base structure for off-shore wind turbines and method for building thereof

Abstract

The invention relates to a base structure for an off-shore wind power installation having a plurality of base piles wherein each base pile has a driving pile which is guided in its interior at least portion-wise for anchoring in the seabed, and at least one support structure for mounting a pylon of a wind power installation, wherein the support structure connects the upper ends of the base piles together. Furthermore the base pile and the driving pile have a region of an overlap on a predetermined lengthwise portion, wherein in the overlap region of the piles the gap between the piles and in part beneath and above the overlap region the free internal cross-section of the piles are filled with a hardening filling material. The invention also relates to a method of erecting a base structure for an off-shore wind power installation and an aligning tool.

1 . A base structure for an off-shore wind power installation having at least a plurality of base piles wherein each base pile ( 2 ,  3 ,  4 ) has a driving pile which is guided in its interior at least portion-wise for anchoring in the seabed, and at least one support structure for mounting a pylon of a wind power installation, wherein the support structure connects the upper ends of the base piles together,
 characterised in that the base pile ( 2 ,  3 ,  4 ) and the driving pile ( 11 ,  12 ,  13 ) have a region of an overlap on a predetermined lengthwise portion, wherein in the overlap region ( 25 ) of the piles the gap ( 29 ) between the piles and in a part beneath and above the overlap region ( 25 ) the free internal cross-section of the piles ( 2 ,  3 ,  4 ,  11 ,  12 ,  13 ) are filled with a hardening filling material ( 30 ).   
     
     
         2 . A base structure as set forth in  claim 1  characterised in that the base pile ( 2  through  4 ) has a bottom ring ( 26 ), preferably with a seal which seals off the gap ( 29 ) relative to the driving pile ( 11 ,  12 ,  13 ). 
     
     
         3 . A base structure as set forth in one of  claims 1  and  2  characterised in that the base pile ( 2  through  4 ) has an inner tube providing its inner peripheral surface and an outer tube providing its outer peripheral surface, wherein a core material is arranged between the inner tube and the outer tube. 
     
     
         4 . A base structure as set forth in one of  claims 1  through  3  characterised in that the driving pile ( 11  through  13 ) has a bulkhead ( 28 ) which is arranged at a spacing beneath the overlap region ( 25 ) and which closes off the free internal cross-section of the driving pile ( 11 ,  12 ,  13 ). 
     
     
         5 . A base structure as set forth in  claim 4  characterised in that the driving pile ( 11  through  13 ) in its pile wall beneath the bulkhead ( 28 ) has at least one opening ( 32 ) for air venting. 
     
     
         6 . A base structure as set forth in one of  claims 2  through  5  characterised in that the bottom ring ( 26 ) extends radially beyond the base pile ( 2 ,  3 ,  4 ) and is connected thereto by support struts ( 34 ). 
     
     
         7 . A base structure as set forth in one of  claims 1  through  6  characterised in that the driving pile ( 11  through  13 ) is provided at least portion-wise on the inside of the pile wall with reinforcement ( 31 ). 
     
     
         8 . A method of erecting a base structure for an off-shore wind power installation, in which a plurality of and preferably three base piles ( 2 ,  3 ,  4 ) provided with driving piles ( 11 ,  12 ,  13 ) are pre-assembled with at least one support structure ( 5 ,  15 ) comprising bars ( 6 ,  7 ,  8 ,  16 ,  17 ,  18 ) to form a construction part, the pre-assembled construction part is transported to the installation location and placed with its base piles ( 2  through  4 ) leading on the seabed ( 10 ), than the driving piles ( 11  through  13 ) are driven into the seabed ( 10 ) and a base portion anchored in the seabed ( 10 ) is produced,
 characterised in that finally a hardening filling material ( 30 ) is introduced into the base portion into at least the overlap region ( 25 ) of the piles and a portion above and below the overlap region and thus a solid base structure ( 1 ) is formed. 
 
     
     
         9 . A method as set forth in the classifying portion of  claim 8  or as set forth in  claim 8  characterised by the step:
 aligning the base portion in such a way that a central axis of a central mounting ( 9 ) for mounting the pylon of a wind power installation is oriented substantially vertically, 
 wherein a filling material ( 30 ) is introduced preferably after the alignment operation. 
 
     
     
         10 . A method as set forth in  claim 9  characterised in that the alignment operation includes:
 displacing at least one, preferably two of the three, base piles ( 2 ,  3 ,  4 ) relative to the driving pile ( 11 ,  12 ,  13 ) by means of an aligning ram ( 100 ) arranged completely within and/or above the base pile ( 2 ,  3 ,  4 ). 
 
     
     
         11 . A method in particular as set forth in  claim 10  or at least one of preceding  claims 9  through  11  and further including the steps:
 introducing the aligning ram ( 100 ) from an upper end of the base pile ( 2 ,  3 ,  4 ), which is above the surface of the sea, into the base pile ( 2 ,  3 ,  4 ), 
 contacting a ram head ( 106 ) of the aligning ram ( 100 ) with the driving pile ( 11 ,  12 ,  13 ), 
 bringing a support device ( 105 ) of the aligning ram ( 100 ) into engagement with the base pile ( 2 ,  3 ,  4 ), and 
 extending a portion of the aligning ram ( 100 ) to displace the base pile ( 2 ,  3 ,  4 ) relative to the driving pile ( 11 ,  12 ,  13 ). 
 
     
     
         12 . A method as set forth in  claim 11  characterised in that extension of the aligning ram ( 100 ) is effected hydraulically. 
     
     
         13 . A method as set forth in one of  claims 11  and  12  and further including the step:
 introducing filling material ( 30 ) through a passage ( 112 ) in the aligning ram ( 100 ) into the driving pile ( 11 ,  12 ,  13 ) and/or the overlap region. 
 
     
     
         14 . A method as set forth in one of  claims 8  through  13  characterised by the step:
 closing, preferably air-tightly sealing, the upper open end of at least one base pile ( 2 ,  3 ,  4 ) by means of a closure device ( 150 ). 
 
     
     
         15 . An aligning tool including
 an aligning ram ( 100 ) with a ram tube ( 118 ), a ram head ( 106 ) connected to the ram tube for coming into contact with a driving pile ( 11 ,  12 ,  13 ), and a support device ( 105 ) for supporting a base pile ( 2 ,  3 ,  4 ).