Windmill construction and a method for assembly of a windmill construction
A windmill construction ( 10 ), comprising a rotor-nacelle assembly ( 12 ) with blades ( 14 ), a tower ( 16 ), a substructure ( 20 ) and a foundation ( 22 ). The substructure ( 20 ) comprises a first guide collar ( 24 ) and a second guide collar ( 26 ) for support of the tower ( 16 ), said first guide collar ( 24 ) being located in a lower part of the substructure ( 20 ) and said second guide collar ( 26 ) being located in an upper part of the substructure ( 20 ). The substructure ( 20 ) comprises a jack-up assembly ( 30 ) for receipt of modular tower segments ( 18 ), said tower segments ( 18 ) are arranged to be assembled in the substructure ( 20 ) and erectable by the jack-up assembly ( 30 ) to produce an assembled tower ( 16 ). The invention is also directed to a method for assembly of a windmill construction.
1. A windmill construction ( 10 ), comprising:
a rotor-nacelle assembly ( 12 ) with blades ( 14 ),
a tower ( 16 ),
a substructure ( 20 ), and
a foundation ( 22 ),
the substructure ( 20 ) and the foundation ( 22 ) being integrated with each other, wherein the substructure ( 20 ) comprises a first guide collar ( 24 ) and a second guide collar ( 26 ) for support of the tower ( 16 ), said first guide collar ( 24 ) being located in a lower part of the substructure ( 20 ) and said second guide collar ( 26 ) being located in an upper part of the substructure ( 20 ), and
the substructure ( 20 ) comprises a jack-up assembly ( 30 ) for receipt of modular tower segments ( 18 ), said tower segments ( 18 ) are arranged to be assembled in the substructure ( 20 ) and are erectable by the jack-up assembly ( 30 ) to produce an assembled tower ( 16 ); wherein the tower segments ( 18 ) are tubular section each equipped with vertical guide rails ( 38 ) for connection to the jack-up assembly ( 30 ).
2. The windmill construction ( 10 ) according to claim 1 , wherein the first guide collar ( 24 ) and the second guide collar ( 26 ) each has an aperture allowing through going axial movement of the tower segments ( 18 ).
3. The windmill construction ( 10 ) according to claim 1 , wherein the first guide collar ( 24 ) and the second guide collar ( 26 ) are closable and openable.
4. The windmill construction ( 10 ) according to claim 1 , wherein the first guide collar ( 24 ) and the second guide collar ( 26 ) comprises elastic dampers.
5. The windmill construction ( 10 ) according to claim 1 , wherein the substructure ( 20 ) comprises a third guide collar ( 28 ) located between the first guide collar ( 24 ) and the second guide collar ( 26 ), wherein the third guide collar ( 28 ) has a closable and openable aperture allowing through going axial movement of the tower segments ( 18 ).
6. The windmill construction ( 10 ) according to claim 1 , wherein a third guide collar ( 28 ) comprises an elastic damper.
7. The windmill construction ( 10 ) according to claim 1 , wherein the substructure ( 20 ) is a lattice structure.
8. The windmill construction ( 10 ) according to claim 1 , wherein each tower segment ( 18 ) is a tubular pipe section or a lattice section.
9. The windmill construction ( 10 ) according to claim 1 , wherein each tower segment ( 18 ) comprises flanges ( 18 a ) for attachment to abutting tower segments ( 18 ).
10. The windmill construction ( 10 ) according to claim 1 , wherein the jack-up assembly ( 30 ) comprises hydraulic pressure cylinders ( 32 ) attachable to each tower segment ( 18 ), said hydraulic pressure cylinders ( 32 ) comprise lower and upper claws ( 34 , 36 ) for gripping and locking onto vertical guide rails ( 38 ) on the tower segment ( 18 ), wherein the vertical guide rails are T-shaped, and wherein the hydraulic pressure cylinders ( 32 ) are activatable to force the tower segments ( 18 ) upwards during assembly of the tower ( 16 ).
11. The windmill construction ( 10 ) according to claim 1 , wherein the jack-up assembly ( 30 ) comprises a rack and pinion system ( 40 , 42 ), said rack and pinion system ( 40 , 42 ) being activatable to force the tower segments ( 18 ) upwards during assembly of the tower ( 16 ).
12. The windmill construction ( 10 ) according to claim 1 , wherein the jack-up assembly ( 30 ) comprises a winch system ( 52 ) connected to a support platform ( 54 ), said winch system ( 52 ) being activatable to force the support platform ( 54 ) and the tower segments ( 18 ) upwards during assembly of the tower ( 16 ).
13. The windmill construction ( 10 ) according to claim 1 , wherein the tower ( 16 ) and/or the tower segments ( 18 ) comprises attachment lugs ( 62 ) for guy lines ( 60 ).
14. The windmill construction ( 10 ) according to claim 1 , wherein the jack-up assembly ( 30 ) is located on or adjacent the first guide collar ( 24 ).
15. The windmill construction ( 10 ) according to claim 1 , wherein the foundation ( 22 ) comprises a storage- and assembly room ( 44 ) for unassembled tower segments ( 18 ).
16. The windmill construction ( 10 ) according to claim 1 , wherein the jack-up assembly ( 30 ) is arranged to elevate assembled tower segments ( 18 ) in a vertical direction to a height corresponding to one tower segment ( 18 ), allowing assembly of a new tower segment ( 18 ) to a previously assembled and elevated tower segment ( 18 ).
17. The windmill construction ( 10 ) according to claim 1 , wherein the foundation ( 22 ) comprises a downward directed conical support ( 50 ) as a bearing point against a bearing structure ( 64 ).
18. The windmill construction ( 10 ) according to claim 1 , wherein the foundation ( 22 ) is supported on an elastic bearing structure ( 64 ).
19. The windmill construction ( 10 ) according to claim 1 , wherein the foundation ( 22 ) comprises a crane ( 70 ).
20. A method for assembly of the windmill construction ( 10 ) according to claim 1 , the method comprising the steps:
assembling the substructure ( 20 ) with the first guide collar ( 24 ) and the second guide collar ( 26 ) for support of the tower ( 16 ),
building the tower ( 16 ) by assembling tower segments ( 18 ) using the jack-up assembly ( 30 ), said jack-up assembly ( 30 ) elevates assembled tower segments ( 18 ) in a vertical direction through said first and second guide collars ( 24 , 26 ), and
transporting the windmill construction ( 10 ) to an offshore platform ( 72 , 72 ′), wherein the rotor-nacelle assembly ( 12 ) and blades ( 14 ) are preinstalled on top of a first part of the tower ( 16 ) extending above the substructure ( 20 ), and to assemble and elevate tower segments ( 18 ) carrying the first part of the tower ( 16 ) with the rotor-nacelle assembly ( 12 ) and blades ( 14 ) to a desired height.
21. The method according to claim 20 , comprising stepwise building of the tower ( 16 ) by elevating assembled tower segments ( 18 ) in the vertical direction to a height corresponding to one tower segment ( 18 ), allowing assembly of a new tower segment ( 18 ) to a previously assembled and elevated tower segment ( 18 ).
22. The method according to claim 20 , comprising the steps of mounting the rotornacelle assembly ( 12 ) and blades ( 14 ) on top of the first part of the tower ( 16 ) extending above the substructure ( 20 ), and to assemble and elevate tower segments ( 18 ) carrying the first part of the tower ( 16 ) with the rotor-nacelle assembly ( 12 ) and blades ( 14 ) to a desired height.
23. The method according to claim 22 , comprising the steps of assembling tower segments ( 18 ) to construct said first part of the tower ( 16 ).
24. The method according to claim 22 , comprising the step of inserting said first part of the tower ( 16 ) in the substructure ( 20 ).
25. The method according to claim 20 , comprising the step of assembling on site the substructure ( 20 ) on the foundation ( 22 ) using a crane ( 70 ) mounted on the foundation ( 22 ).
26. The method according to claim 20 , comprising the step of assembling the substructure ( 20 ) as a lattice structure on the foundation ( 22 ).
27. The method according to claim 20 , comprising the step of connecting guy lines ( 60 ) to the tower ( 16 ).
28. The method according to claim 20 , comprising the steps of
connecting guy lines ( 60 ) to one or more tower segments ( 18 ) after the assembled tower segments ( 18 ) have been elevated in the vertical direction through and above said second guide collar ( 26 ), and
adjusting tensioning of the guy lines ( 60 ) during elevating of the tower ( 16 ).