Construction method and construction apparatus for offshore wind turbine generator

1. A construction apparatus for constructing a floating offshore wind turbine generator having a tower member with a crane ship, the apparatus comprising:

a guide member having an axial direction and configured to be attached to the crane ship in a work position perpendicular thereto such that a bottom end of the guide member is disposed under the sea; and

at least one pair of arm units attached to the guide member and each of said arm units including a plurality of sets of grippers whose distance from each other in the axial direction is changeable,

wherein said plurality of sets of grippers are slidable along the axial direction of the guide member for holding and releasing a tower member divided into a plurality of segments in the axial direction.

2. The construction apparatus for an offshore wind turbine generator according to claim 1 , wherein the guide member is rotatable between a sailing position parallel to the crane ship and the work position perpendicular the crane ship.

3. The construction apparatus for an offshore wind turbine generator according to claim 1 , further comprising an axially sliding mechanism mounted to the guide member, and/or an extension/retraction mechanism mounted to the guide member for changing the length of the guide member in the axial direction.

4. A construction method for constructing a floating offshore wind turbine generator with a crane ship,

wherein the offshore wind turbine generator is constructed using the construction apparatus according to claim 1 such that the tower member is joined to the crane ship.

5. The construction apparatus for an offshore wind turbine generator according to claim 1 , wherein said distance between the plurality of sets of grippers in the axial direction is changeable by extension/retraction in the axial direction of the guide member.

6. The construction apparatus for an offshore wind turbine generator according to claim 1 , wherein said plurality of sets of grippers of the arm units are openable and closeable for respectively holding and releasing said divided segments of the tower member in a horizontal direction which is substantially perpendicular to the crane ship.

7. The construction apparatus for an offshore wind turbine generator according to claim 6 , wherein said plurality of sets of grippers are configured to respectively hold and release flanges of the segments of the tower member in the horizontal direction.

8. The construction apparatus for an offshore wind turbine generator according to claim 6 , wherein said plurality of sets of grippers are configured to respectively hold and release protrusions of the segments of the tower member in the horizontal direction, and

said construction apparatus further comprises rolling elements connecting said plurality of sets of grippers to said protrusions.

9. Maintenance equipment for maintaining a floating offshore wind turbine generator having a tower member with a crane ship, the equipment comprising:

a guide member having an axial direction and configured to be attached to the crane ship in a work position perpendicular thereto such that a bottom end of the guide member is disposed under the sea; and

at least one pair of arm units attached to the guide member and each of said arm units including a plurality of sets of grippers whose distance from each other in the axial direction is changeable,

wherein said plurality of sets of grippers are slidable along the axial direction of the guide member for holding and releasing a tower member divided into a plurality of segments in the axial direction.

10. The maintenance equipment for an offshore wind turbine generator according to claim 9 , wherein the guide member is rotatable between a sailing position parallel to the crane ship and the work position perpendicular to the crane ship.

11. The maintenance equipment for an offshore wind turbine generator according to claim 9 , further comprising an axially sliding mechanism mounted to the guide member, and/or an extension/retraction mechanism mounted to the guide member for changing the length of the guide member in the axial direction.

12. A maintenance method for maintaining a floating offshore wind turbine generator with a crane ship,

wherein the offshore wind turbine generator is constructed using the maintenance equipment according to claim 9 such that the tower member is joined to the crane ship.

13. The maintenance equipment for an offshore wind turbine generator according to claim 9 , wherein said distance between the plurality of sets of grippers in the axial direction is changeable by extension/retraction in the axial direction of the guide member.

14. The maintenance equipment for an offshore wind turbine generator according to claim 9 , wherein said plurality of sets of grippers of the arm units are openable and closeable for respectively holding and releasing said divided segments of the tower member in a horizontal direction which is substantially perpendicular to the crane ship.

15. The maintenance equipment for an offshore wind turbine generator according to claim 14 , wherein said plurality of sets of grippers are configured to respectively hold and release flanges of the segments of the tower member in the horizontal direction.

16. The maintenance equipment for an offshore wind turbine generator according to claim 14 , wherein said plurality of sets of grippers are configured to respectively hold and release protrusions of the segments of the tower member in the horizontal direction, and

said construction apparatus further comprises rolling elements connecting said plurality of sets of grippers to said protrusions.