US20130051925A1 - Method and device for installation of an elongated offshore structure - Google Patents
Method and device for installation of an elongated offshore structure Download PDFInfo
- Publication number
- US20130051925A1 US20130051925A1 US13/582,860 US201013582860A US2013051925A1 US 20130051925 A1 US20130051925 A1 US 20130051925A1 US 201013582860 A US201013582860 A US 201013582860A US 2013051925 A1 US2013051925 A1 US 2013051925A1
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- United States
- Prior art keywords
- outer frame
- offshore structure
- supporting
- cross bar
- inner frame
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- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/003—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting very large loads, e.g. offshore structure modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/08—Arrangement of ship-based loading or unloading equipment for cargo or passengers of winches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B75/00—Building or assembling floating offshore structures, e.g. semi-submersible platforms, SPAR platforms or wind turbine platforms
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
- E02B17/027—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto steel structures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/25—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors specially adapted for offshore installation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/40—Arrangements or methods specially adapted for transporting wind motor components
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0039—Methods for placing the offshore structure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0039—Methods for placing the offshore structure
- E02B2017/0043—Placing the offshore structure on a pre-installed foundation structure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0039—Methods for placing the offshore structure
- E02B2017/0047—Methods for placing the offshore structure using a barge
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0091—Offshore structures for wind turbines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/60—Assembly methods
- F05B2230/604—Assembly methods using positioning or alignment devices for aligning or centering, e.g. pins
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/60—Assembly methods
- F05B2230/61—Assembly methods using auxiliary equipment for lifting or holding
- F05B2230/6102—Assembly methods using auxiliary equipment for lifting or holding carried on a floating platform
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/93—Mounting on supporting structures or systems on a structure floating on a liquid surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/95—Mounting on supporting structures or systems offshore
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method and device for installation of an elongated offshore structure.
- the present invention relates to a method and device for installation of an offshore wind turbine device or a foundation of an offshore wind turbine device.
- a wind turbine device comprises a tower device with a nacelle and rotor blades provided in a first end thereof and a foundation provided in a second end thereof.
- Offshore wind turbine devices may have a floating foundation anchored to the seabed or a foundation fixed to the seabed.
- the object of the invention is to provide an efficient device and method for installation of offshore wind turbine devices such that a shorter time window is needed. Moreover, it is an object that the method and device contribute to a reduced exposure to weather conditions during installation. One further object is that the method and device allows the wind turbine device to be assembled on a land based facility before transportation to the installation site. Of course, the object is also to provide a method and device for decommissioning and transportation of similar structures from sea to land.
- the object of the invention is to provide a device for installation of an elongated offshore structure, where the device comprises:
- the elongated offshore structure is a wind turbine device comprising a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof.
- the invention relates to a device for installation of an offshore wind turbine device, where the wind turbine device comprises a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof, where the device comprises:
- connection device comprises a cross bar slidingly arranged in relation to the outer frame by means of the longitudinal actuation device.
- the first supporting element is connected to the cross bar.
- connection device comprises a second supporting element for releasable connection of the elongated offshore structure or wind turbine device in relation to the outer frame.
- an inner frame is provided inside the outer frame, where the inner frame comprising a first supporting device for supporting the elongated offshore structure or wind turbine device in the substantially horizontal position during transportation to the installation site.
- the inner frame comprises a cross bar supporting device for supporting the cross bar in relation to the inner frame.
- the cross bar supporting device is configured to release the support of the cross bar in the substantially vertical position.
- the inner frame is displaceable in a longitudinal direction with respect to the outer frame.
- the longitudinal actuation device is pivotably mounted to the outer frame.
- control devices are provided to control the orientation of the elongated offshore structure or wind turbine device in the free hanging configuration.
- a locking device is provided for locking the inner frame to the outer frame.
- the invention also relates to a method for installation of an offshore elongated offshore structure, where the method comprises:
- the elongated offshore structure is a wind turbine device comprising a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof.
- the invention relates to a method for installation of an offshore wind turbine device, where the wind turbine device comprises a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof, where the method comprises:
- the method is comprising the step of providing the connection device with a cross bar slidingly arranged in relation to the outer frame by means of the longitudinal actuation device.
- the method is comprising the step of connecting the first supporting element to the cross bar.
- the method is comprising the step of providing the connection device with a second supporting element for releasably connecting the elongated offshore structure or wind turbine device in relation to the outer frame.
- the method is comprising the step of providing an inner frame inside the outer frame, where the inner frame comprising a first supporting device for supporting the elongated offshore structure or wind turbine device in the substantially horizontal position during transportation to the installation site.
- the method is comprising the step of providing the inner frame with a cross bar supporting device for supporting the cross bar in relation to the inner frame.
- the method is comprising the step of configuring the cross bar supporting device to release the support of the cross bar in the substantially vertical position.
- the method is comprising the step of displacing the inner frame in a longitudinal direction with respect to the outer frame.
- the method is comprising the step of controlling the orientation of the elongated offshore structure or wind turbine device in the free hanging configuration.
- the method is comprising the step of locking the inner frame to the outer frame.
- FIG. 1 illustrates a perspective view of a vessel
- FIG. 2 illustrates a perspective view of a first or outer frame
- FIG. 3 illustrates a perspective view of a second or inner frame
- FIG. 4 a and FIG. 4 b illustrate a perspective view of parts of a connection device in closed and open position respectively;
- FIG. 4 c illustrates a perspective view of the connection device from below
- FIG. 5 a illustrates a partial perspective view of the vessel, the inner frame and the outer frame assembled
- FIG. 5 b and FIG. 5 c illustrate an enlarged perspective view of the locking device for locking the inner frame to the outer frame in open and closed position respectively;
- FIG. 6 a illustrates a partial top view of FIG. 5 a
- FIG. 6 b illustrates a partial front view of the embodiment of FIG. 5 a
- FIG. 7 a illustrates how the wind turbine device is supported on the inner frame on a land based facility
- FIG. 7 b illustrates how the inner frame is pulled into the second frame of the vessel
- FIG. 7 c illustrates the transportation to the installation site
- FIG. 7 d illustrates a side view of the arrival at the installation site
- FIG. 7 e and FIG. 7 f illustrate a side view and perspective view of the pivoting of the second frame in relation to the vessel respectively;
- FIG. 7 g - 7 n illustrate the further steps of the installation procedure
- FIG. 8 a - 8 e illustrate a third embodiment of the invention
- FIG. 9 a - 9 e illustrate a fourth embodiment of the invention
- the offshore wind turbine device comprises a tower device 3 with a nacelle 4 and at least one rotor blade 5 provided in a first end thereof and a foundation 6 provided in a second end thereof.
- the wind turbine device is considered known for a skilled person and will not be described here in detail.
- the foundation 6 may typically be a jacket foundation, a mono pile foundation, a tripod foundation, a gravity foundation, a suction anchor foundation, etc.
- the present invention may be used for installation or decommissioning of only some parts of the offshore wind turbine device, for example only the foundation 6 , i.e. without the tower device 3 , nacelle 4 and rotor blade 5 .
- the present invention may be used for installation or decommissioning of other elongated offshore structures, for example jacket foundations for oil and gas facilities, etc.
- the device 1 comprises a vessel 10 .
- the vessel 10 of the present embodiment is a barge intended to be towed to the installation site by means of a towing vessel 8 (see FIG. 7 c ).
- the vessel 10 may be self-propelled by means of propulsion means etc.
- the vessel 10 comprises a main hull structure 10 a with a main deck, and two parallel protruding hull elements 10 b , 10 c where a slot 11 is provided between the two parallel protruding “catamaran-like” hull elements 10 b , 10 c .
- the slot 11 is provided for submerging the foundation 6 into the sea between the two parallel protruding hull elements 10 b , 10 c .
- the vessel 10 as shown in FIG. 1 is substantially U-shaped when viewed from above.
- a longitudinal direction is indicated by line X-X.
- the longitudinal direction is in the description below used to indicate the longitudinal direction of the wind turbine device 2 , more specifically to the tower device 3 , when it is provided in a horizontal position on the device 1 .
- the outer frame 20 comprises a first outer frame element 20 a , a second outer frame element 20 b and a third outer frame element 20 c , where the second and third outer frame elements 20 b , 20 c are fixed perpendicular to the first outer frame element 20 a as shown in FIG. 2 .
- the width Wo of the outer frame 20 is less than the distance between the two hull elements 10 b , 10 c of the vessel.
- the device 1 further comprises a pivoting system for pivoting the outer frame 20 in relation to the vessel 10 .
- the pivoting system comprises pivoting pins 12 provided on the vessel 10 and pivoting openings 21 provided in the second and third outer frame elements 20 b , 20 c , provided for receiving the pivoting pins 12 . Consequently, the outer frame 20 may be pivoted with respect to the axis I-I indicated in FIGS. 1 and 2 , perpendicular to the longitudinal axis X-X.
- the pivoting system further comprises a pivotal actuation device 25 fixed between the outer frame 20 and the vessel 10 .
- the pivotal actuating device 25 comprises one hydraulic cylinder device connected to the each of the second and third outer frame elements 20 b and 20 c , where the piston of the hydraulic cylinder devices is fixed to lugs 13 of the vessel.
- the device 1 further comprises a connection device 40 for connection of the wind turbine device 2 to the outer frame 20 by means of a longitudinal actuation device 42 .
- the longitudinal actuation device 42 is provided for moving the wind turbine device 2 in its longitudinal direction.
- the longitudinal actuation device 42 comprises a hydraulic cylinder device connected to the end of each of the second and third outer frame elements 20 b , 20 c as illustrated in FIG. 2 .
- the connection device 40 comprises a first supporting element 41 which may be fixed to the piston of the hydraulic cylinder devices by means of connection elements 47 .
- the first supporting element 41 is in the present embodiment a supporting ring fixed around the tower device 3 .
- the connection elements 47 may be flexible connection elements such as chains, wires, cables etc. Alternatively, the connection elements 47 may be rods connected to the pistons and/or first supporting element 41 by means of articulated joints etc.
- connection elements 47 and the other elements of the connection device 40 are to provide the wind turbine device 2 in a free hanging configuration when the outer frame 20 is in the substantially vertical position.
- the free hanging configuration allows an easy orientation of the foundation 6 of the wind turbine device with respect to the seabed or with respect to anchoring devices (not shown) at the installation site.
- the longitudinal actuation device 42 is provided for lowering the wind turbine device 2 towards the seabed when the wind turbine device 2 is in the free hanging configuration.
- the weight of the wind turbine device 2 is in the vertical position carried by the outer frame 20 via the first supporting element 41 , the connection elements 47 and the longitudinal actuation device 42 .
- the outer frame 20 may be pivoted in relation to the vessel with an angle ⁇ between 0 and ca 100° (as indicated in FIG. 7 j ).
- the outer frame 20 is pivotable in relation to the vessel 10 between a substantially horizontal position for transporting the wind turbine device 2 to the installation site and a substantially vertical position for installation of the wind turbine device 2 at the installation site.
- the free hanging configuration may be achieved when the pivotation of the outer frame 20 is substantially perpendicular to the vessel (i.e. angle ⁇ 90°, i.e. the position shown in FIG. 7 g .
- angle ⁇ 90° i.e. the position shown in FIG. 7 g .
- the orientation of the foundation 6 may be limited due to its contact with the outer frame 20 .
- the possibilities for orientation of the wind turbine device 2 increases.
- the longitudinal actuation device 42 may be pivotably mounted to the outer frame 20 . In this way, the distance between the outer frame 20 and the wind turbine device 2 is increasing further when the angle ⁇ is increased to more than 90°.
- the vessel 10 may comprises control devices 14 ( FIG. 1 ), for example winches or similar, for controlling the orientation of the wind turbine device 2 in the free hanging configuration.
- control devices 14 may be used to rotate the wind turbine device around its longitudinal axis by using one of the winches, or by pulling the foundation 6 away from the outer frame 20 by using both of the winches.
- a dynamically positioned vessel may help with the orientation of the wind turbine device 2 .
- orientation may be performed by slackening or tightening the anchoring wires.
- the vessel 10 itself may be self-propelled and dynamically positioned to orient the wind turbine device 2 correctly.
- the wind turbine device 2 is connected to the outer frame 20 via the longitudinal actuation device 42 , where the outer frame 20 is pivotable in relation to a vessel 10 .
- the wind turbine device 2 is transported to the installation site in a substantially horizontal position, i.e. substantially parallel to the vessel 10 .
- the outer frame 20 is pivoted to a substantially vertical position, thereby providing that the wind turbine device 2 is in a free hanging configuration via the longitudinal actuation device 42 when the outer frame 20 is in the substantially vertical position.
- the wind turbine device may be lowered towards the seabed by means of the longitudinal actuation device 42 .
- the foundation 6 of the wind turbine device is fixed to the seabed or anchored to the seabed by means of anchoring devices.
- a seabed supporting frame 9 has been preinstalled on, and is fixed to, the seabed.
- the seabed supporting frame 9 is assumed known for a skilled person. Consequently, the foundation of the wind turbine device only has to be lowered down into the seabed supporting frame 9 before fixing the seabed supporting frame to the foundation of the wind turbine device. This represents a very efficient way of installing an offshore wind turbine device, since no interaction with the seabed itself is necessary.
- connection elements 47 are connected directly between the first supporting element 41 and the longitudinal actuation device 42 . It should be noted that it would be possible to use only one connection element and one hydraulic cylinder as the longitudinal actuation device 42 . A free hanging configuration would still be achieved between the wires of the control devices 14 and the only one connection element 47 .
- connection device 40 comprises a cross bar 43 slidingly arranged in relation to the outer frame 20 by means of the longitudinal actuation device 42 .
- the cross bar 43 is showed in detail in FIGS. 4 a and 4 b .
- Each end 44 of the cross bar comprises different connection interfaces: a first connection interface 44 a for supporting the cross bar 43 between the second and third outer frame elements 20 b , 20 c in the horizontal position, i.e.
- connection elements 47 for bearing the cross bar against the upper edges of the second and third outer frame elements 20 b , 20 c in the horizontal position; a second connection interface 44 b for connection to the longitudinal actuation device 42 , for example lugs for connection to the piston of the longitudinal actuation device 42 ; and a third connection interface 44 c , for example lugs, for connection to the connection elements 47 .
- the longitudinal actuation device 42 comprises two hydraulic cylinders.
- connection elements 47 connected between the first supporting element 41 and the cross bar 43 , i.e. to each of the third connection interfaces 44 c of the cross bar 43 .
- the connection device 40 may comprise a second supporting element 45 for releasable connection of the wind turbine device 2 in relation to the outer frame 20 ( FIG. 4 a , 4 b ).
- the second supporting element 45 comprises two locking arms 45 a pivotably connected to the cross bar 43 , where the locking arms 45 a may be opened and closed by means of hydraulic cylinders 46 .
- the tower device 3 of the wind turbine device 2 may be releasably locked to the cross bar 43 .
- the hydraulic cylinders 46 in the present embodiment is not provided for carrying the weight of the wind turbine device when in the vertical position, they are only locking the tower device 3 with respect to transverse movement of the tower device, not axial movement.
- the connection device 40 also comprises a rear protruding pin 48 as shown in FIG. 4 c . It is now referred to FIG. 3 and FIG. 5 a - c and FIG. 6 a - b .
- the device 1 according to the second embodiment may comprise an inner or second frame 30 provided inside the outer frame 20 .
- the inner frame comprises a first inner frame element 30 a , a second inner frame element 30 b and a third inner frame element 30 c , where the second and third inner frame elements 30 b , 30 c are fixed perpendicular to the first inner frame element 30 a as shown in FIG. 2 .
- the width Wi of the inner frame 30 is less than the distance between the second and third outer frame elements 20 b , 20 c of the outer frame 20 .
- the inner frame 30 may be located inside the outer frame 20 .
- the inner frame 30 is displaceable in a longitudinal direction with respect to the outer frame 20 .
- the inner frame 30 may for example comprise roller devices, skid pads or wheels for rolling into the outer frame 20 . This will be described more in detail below.
- a locking device 60 may be provided for locking the inner frame 20 to the outer frame 30 .
- FIGS. 5 b and 5 c one example of such a locking device is illustrated.
- the locking device comprises a toothed bar fixed to the inner frame and a movable locking arm fixed to the outer frame for locking to the toothed bar. In the open position, the inner frame may be moved in relation to the outer frame, and in the locked position this movement is prevented.
- the outer frame 20 may comprise one such locking device 60 on each side.
- the inner frame comprises first supporting devices 31 , 32 , for supporting the wind turbine device 2 in the substantially horizontal position during transportation to the installation site.
- the first supporting devices 31 , 32 may comprise a substantially semi-circular surface adapted to receive the tower device 3 , where the substantially semi-circular surfaces are fixed to the first inner frame element 30 a , the second inner frame element 30 b and the third inner frame element 30 c by means of supporting bars.
- the inner frame may comprise only one of the respective first supporting devices 31 or 32 , or no such supporting devices at all.
- the foundation 6 of the wind turbine device 2 will normally be bearing against or supported by the inner frame 30 .
- the inner frame 30 may also comprise a cross bar supporting device 33 for supporting the cross bar 43 in relation to the inner frame 30 .
- the cross bar supporting device 33 comprises an opening for receiving the rear protruding pin 48 of the connection device 40 .
- the cross bar supporting device 33 is configured to release the support of the cross bar 43 in the substantially vertical position.
- the pivotation of the outer frame reaches an angle of 90° or more, the rear protruding pin 48 is no longer supported by the cross bar supporting device 33 , and consequently, the abovementioned free hanging configuration is achieved.
- the cross bar 43 may now be lowered (and if necessary raised) in relation to the inner frame 30 . Please note that the inner frame 30 should be locked to the outer frame before pivoting the outer frame in relation to the vessel.
- a seabed supporting frame 9 has been preinstalled on, and is fixed to, the seabed.
- FIG. 7 a where the inner frame 30 is separated from the outer frame 20 and the vessel 10 .
- the inner frame 30 is here movable on rails on a pier.
- the wind turbine device is supported in a horizontal position on the inner frame 30 . More specifically, the foundation 6 is supported directly on the inner frame element 30 a and the tower device 3 is supported on the first supporting devices 31 , 32 .
- connection device 40 is here connected to the inner frame 30 , i.e. the cross bar supporting device 33 is supporting the cross bar 43 in relation to the inner frame 30 since the rear protruding pin 48 is inserted into the opening of the cross bar supporting device 33 .
- first supporting element 41 is connected around the tower device 3 and is connected to the cross bar 43 via the connection elements 47 .
- second supporting element 45 of the connection device is connected to the tower device.
- the inner frame 30 with the connection device 40 is run onto or into the outer frame 20 .
- This can be performed by using the longitudinal actuation devices 42 , for example connected to the inner frame 30 by means of chains or similar (shown in FIG. 7 a ), and stepwise pulling the inner frame towards the outer frame.
- a separate vehicle etc may be used to push the inner frame and the connection device 40 into or onto the outer frame 20 .
- the inner frame 30 may now also be locked to the outer frame 20 by means of the locking device 60 , however this is strictly not necessary.
- the cross bar 43 is being connected to the longitudinal actuating devices 42 via the connection interface 44 b.
- the device 1 is now transported to the installation site with the wind turbine device 2 in the substantially horizontal position.
- FIG. 7 c it is shown that a towing vessel 8 is used.
- FIG. 7 d illustrates the situation on the installation site, with the seabed supporting frame 9 provided on the seabed. Note the wires 14 a connected between the control devices 14 and the foundation 6 .
- FIGS. 7 e and 7 f the outer frame 20 is pivoted in relation to the vessel 10 by means of the pivotal actuation devices 25 .
- the outer frame 20 has reached a substantially vertical position. If necessary, the locking device 60 could have been unlocked for adjusting the inner frame 30 with respect to the outer frame 20 in the horizontal position or before the outer frame 20 reaches the vertical position. This could for example be performed to avoid that the foundation 6 crashes into the seabed during the pivotation.
- the wind turbine device is supported by the connection device 40 in relation to the outer frame. Due the cross bar 43 and its support in the supporting device 33 of the inner frame 30 , the inner frame is also supported with respect to the outer frame. Hence, the locking device 60 is not necessary for supporting the inner frame with respect to the outer frame as long as the rear protruding pin 48 of the cross bar 43 is supported by the supporting device. This would be the case for pivotation angles between 0° and 90°.
- the protruding pin 48 When the pivotation angle exceeds 90°, the protruding pin 48 will exit from the supporting device 33 . Before that happens, the inner frame should be locked to the outer frame by means of the locking device 60 .
- the outer frame 30 by pivoting the outer frame 30 further, for example to the position shown in FIGS. 7 i and 7 k , the cross bar 43 is released from the cross bar supporting device 33 of the inner frame, since the longitudinal actuation devices 42 are pivotably mounted to the outer frame 20 as described above.
- the weight of the wind turbine device provides that the longitudinal actuation devices 42 are hanging downwardly from the outer frame. Consequently, the wind turbine device is in a substantially vertical position, even though the outer frame is pivoted to an angle more than 90°.
- the wind turbine device is now in a free hanging configuration and may be lowered towards the seabed by means of the longitudinal actuation device 42 ( FIGS. 7 j and 7 l ).
- the positioning of the wind turbine device may be performed by moving the vessel with respect to the seabed.
- the tower device may now be released from the cross bar 43 by opening the second supporting element 45 .
- the control device 14 may control the orientation of the foundation with respect to the seabed supporting frame 9 by means of the wires 14 a before the foundation is lowered further onto the seabed supporting frame 9 .
- the foundation is then fixed to the seabed supporting frame 9 , and the connection device 40 is released from the wind turbine device allowing the vessel 10 with the outer and inner frames 30 , 20 to leave the now installed wind turbine device.
- FIG. 8 a - 8 e A third embodiment is shown in FIG. 8 a - 8 e .
- the same reference numbers are used as in the embodiments described above, and will therefore not be described in detail herein.
- FIG. 8 a it is shown that the device according to the invention is used to install a foundation 6 of a wind turbine device 2 , i.e. the tower device 3 with a nacelle 4 and rotor blade(s) 5 are installed on the foundation 6 in a subsequent operation by means of a similar or a different installation vessel.
- the foundation 6 comprises suction anchor foundations 6 a.
- the vessel 10 is in this embodiment comprising propulsion means 15 .
- these propulsion means 15 may be elevated to the position of FIG. 8 a during transportation, and may be lowered to the position of FIG. 8 b for positioning and orienting the vessel at the installation site.
- the device comprises a vessel 10 , a first or outer frame 20 and a second or inner frame 30 pivotable in relation to the vessel as described above.
- the pivotal actuation device 25 for pivoting the outer frame 20 in relation to the vessel is in this embodiment comprising a hydraulic actuator connected to the outer frame 20 and is comprising a climbing beam device in contact with the vessel 10 , as shown in FIG. 8 b.
- connection device 40 of the present embodiment comprises a first supporting element 41 connected to the top end of the foundation 6 .
- a cross bar 43 and a connection element 47 is provided for connecting the first supporting element 41 to the outer frame 20 via the longitudinal actuation device 42 and for supporting the connection device 40 to the inner frame 30 . See FIGS. 8 b and 8 c.
- the longitudinal actuation device 42 here comprises a chain climbing device with a chain 42 a .
- the present embodiment comprises two such longitudinal actuation devices 42 , as shown in FIG. 8 b.
- the free hanging configuration is shown in FIG. 8 c .
- the first supporting element 41 is hanging freely with respect to the inner and outer frame 20 , 30 , i.e. it is no longer supported by the inner and outer frames.
- the longitudinal actuation device 42 can now be used to lowering the foundation 6 towards the seabed, while the control devices 14 can be used to control the orientation of the foundation 6 with respect to the seabed together with the propulsion devices 15 .
- FIG. 9 a - 9 e A second alternative embodiment is shown in FIG. 9 a - 9 e .
- the same reference numbers are used as in the embodiments described above, and will therefore not be described in detail herein.
- FIG. 9 a it is shown that the device according to the invention is used to install a foundation 6 of a wind turbine device 2 , i.e. the tower device 3 with a nacelle 4 and rotor blade(s) 5 are installed on the foundation 6 in a subsequent operation by means of a similar or a different installation vessel.
- the foundation 6 comprises suction anchor foundations 6 a.
- the device comprises a vessel 10 and first or outer frame 20 pivotable in relation to the vessel.
- first or outer frame 20 pivotable in relation to the vessel.
- second or inner frame 30 there is no second or inner frame 30 .
- the centre of gravity of the foundation 6 is provided over the slot 11 of the vessel 10 , i.e. to the left of the pivotal pins 12 defining the pivotal axis I-I in FIG. 9 b . Consequently, an alternative pivotal actuation device 25 may be used.
- the pivotal actuation device 25 comprises two winches, each provided on the respective protruding hull structures 10 b , 10 c . A wire of the winches is connected to the lower part of the foundation 6 . Hence, when the winches are releasing their wires, the foundation 6 and outer frame 20 will rotate due to the weight of the foundation 6 to its substantial vertical position shown in FIG. 9 c.
- connection device 40 of the present embodiment comprises a first supporting element 41 connected to the top end of the foundation 6 .
- the connection element 41 is connected to the outer frame 20 via the longitudinal actuation device 42 .
- the foundation 6 is supported directly against the outer frame 20 in the horizontal position, i.e. there is no cross bar 43 and connection elements 47 .
- the longitudinal actuation device 42 here comprises a chain climbing device with a chain 42 a .
- the chain 42 a is connected directly to the first supporting element 41 .
- the present embodiment comprises one such longitudinal actuation device 42 , as shown in FIG. 9 b.
- the free hanging configuration is shown in FIG. 9 c .
- the first supporting element 41 is hanging freely with respect to the outer frame 20 and the first supporting element 41 and the foundation 6 are no longer supported by the outer frame 20 .
- the longitudinal actuation device 42 can now be used to lowering the foundation 6 towards the seabed, while the control devices 14 can be used to control the orientation of the foundation 6 with respect to the seabed.
- the first supporting device 41 may comprise one element 41 a connected to the connection device 40 and one element 41 b connected to the foundation 6 or wind turbine device 2 .
- the elements 41 a and 41 b are connected to each other when foundation 6 is connected to the connection device 40 , but is separated from each other when disconnecting the foundation from the connection device 40 . This is for example indicated in FIG. 8 e.
- the vessel 10 may have many other suitable designs and configurations than the one illustrated in FIG. 1 .
- the length of the vessel shorter than the length of the wind turbine device 2 , but the invention is not limited to such embodiments.
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Abstract
A method and device for installation of an offshore elongated offshore structure are disclosed. The device includes a vessel an outer frame pivotable in relation to the vessel between a substantially horizontal position for transporting the elongated offshore structure to the installation site and a substantially vertical position for installation of the elongated offshore structure at the installation site. A connection device is provided for connection of the elongated offshore structure to the outer frame via a longitudinal actuation device. The connection device includes a first supporting element for providing the elongated offshore structure in a free hanging configuration when the outer frame is in the substantially vertical position. The longitudinal actuation device is provided for lowering the elongated offshore structure towards the seabed when the elongated offshore structure is in the free hanging configuration.
Description
- The present invention relates to a method and device for installation of an elongated offshore structure. In particular, the present invention relates to a method and device for installation of an offshore wind turbine device or a foundation of an offshore wind turbine device.
- Several concepts and designs exist for offshore wind turbine devices. Basically, a wind turbine device comprises a tower device with a nacelle and rotor blades provided in a first end thereof and a foundation provided in a second end thereof.
- Offshore wind turbine devices may have a floating foundation anchored to the seabed or a foundation fixed to the seabed.
- The installation of offshore wind turbine devices is a vulnerable operation until the foundation is anchored or fixed sufficiently to the seabed. Often, a considerable time window with good weather forecasts is needed before the operation can begin.
- The object of the invention is to provide an efficient device and method for installation of offshore wind turbine devices such that a shorter time window is needed. Moreover, it is an object that the method and device contribute to a reduced exposure to weather conditions during installation. One further object is that the method and device allows the wind turbine device to be assembled on a land based facility before transportation to the installation site. Of course, the object is also to provide a method and device for decommissioning and transportation of similar structures from sea to land.
- It is also an object to provide an efficient device and method for installation of other elongated offshore structures.
- The object of the invention is to provide a device for installation of an elongated offshore structure, where the device comprises:
-
- a vessel;
- an outer frame pivotable in relation to the vessel between a substantially horizontal position for transporting the elongated offshore structure to the installation site and a substantially vertical position for installation of the elongated offshore structure at the installation site;
- a connection device for connection of the elongated offshore structure to the outer frame via a longitudinal actuation device;
where the connection device comprises a first supporting element for providing the elongated offshore structure in a free hanging configuration when the outer frame is in the substantially vertical position, and where the longitudinal actuation device is provided for lowering the elongated offshore structure towards the seabed when the an elongated offshore structure is in the free hanging configuration.
- In one aspect, the elongated offshore structure is a wind turbine device comprising a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof. Hence, in this aspect, the invention relates to a device for installation of an offshore wind turbine device, where the wind turbine device comprises a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof, where the device comprises:
-
- a vessel;
- an outer frame pivotable in relation to the vessel between a substantially horizontal position for transporting the wind turbine device to the installation site and a substantially vertical position for installation of the wind turbine device at the installation site;
- a connection device for connection of the wind turbine device to the outer frame via a longitudinal actuation device;
where the connection device comprises a first supporting element for providing the wind turbine device in a free hanging configuration when the outer frame is in the substantially vertical position, and where the longitudinal actuation device is provided for lowering the wind turbine device towards the seabed when the wind turbine device is in the free hanging configuration.
- In one aspect, the connection device comprises a cross bar slidingly arranged in relation to the outer frame by means of the longitudinal actuation device.
- In one aspect, the first supporting element is connected to the cross bar.
- In one aspect, the connection device comprises a second supporting element for releasable connection of the elongated offshore structure or wind turbine device in relation to the outer frame.
- In one aspect, an inner frame is provided inside the outer frame, where the inner frame comprising a first supporting device for supporting the elongated offshore structure or wind turbine device in the substantially horizontal position during transportation to the installation site.
- In one aspect, the inner frame comprises a cross bar supporting device for supporting the cross bar in relation to the inner frame.
- In one aspect, the cross bar supporting device is configured to release the support of the cross bar in the substantially vertical position.
- In one aspect, the inner frame is displaceable in a longitudinal direction with respect to the outer frame.
- In one aspect, the longitudinal actuation device is pivotably mounted to the outer frame.
- In one aspect, control devices are provided to control the orientation of the elongated offshore structure or wind turbine device in the free hanging configuration.
- In one aspect, a locking device is provided for locking the inner frame to the outer frame.
- The invention also relates to a method for installation of an offshore elongated offshore structure, where the method comprises:
-
- connecting the elongated offshore structure to an outer frame via a longitudinal actuation device, where the outer frame is pivotable in relation to a vessel;
- transporting the elongated offshore structure to the installation site in a substantially horizontal position;
- pivoting the outer frame to a substantially vertical position at the installation site;
- providing the elongated offshore structure in a free hanging configuration via the longitudinal actuation device when the outer frame is in the substantially vertical position;
- lowering the elongated offshore structure towards the seabed by means of the longitudinal actuation device when the elongated offshore structure is in the free hanging configuration.
- In one aspect, the elongated offshore structure is a wind turbine device comprising a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof. Hence, in this aspect, the invention relates to a method for installation of an offshore wind turbine device, where the wind turbine device comprises a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof, where the method comprises:
-
- connecting the wind turbine device to an outer frame via a longitudinal actuation device, where the outer frame is pivotable in relation to a vessel;
- transporting the wind turbine device to the installation site in a substantially horizontal position;
- pivoting the outer frame to a substantially vertical position at the installation site;
- providing the wind turbine device in a free hanging configuration via the longitudinal actuation device when the outer frame is in the substantially vertical position;
- lowering the wind turbine device towards the seabed by means of the longitudinal actuation device when the wind turbine device is in the free hanging configuration.
- In one aspect the method is comprising the step of providing the connection device with a cross bar slidingly arranged in relation to the outer frame by means of the longitudinal actuation device.
- In one aspect the method is comprising the step of connecting the first supporting element to the cross bar.
- In one aspect the method is comprising the step of providing the connection device with a second supporting element for releasably connecting the elongated offshore structure or wind turbine device in relation to the outer frame.
- In one aspect the method is comprising the step of providing an inner frame inside the outer frame, where the inner frame comprising a first supporting device for supporting the elongated offshore structure or wind turbine device in the substantially horizontal position during transportation to the installation site.
- In one aspect the method is comprising the step of providing the inner frame with a cross bar supporting device for supporting the cross bar in relation to the inner frame.
- In one aspect the method is comprising the step of configuring the cross bar supporting device to release the support of the cross bar in the substantially vertical position.
- In one aspect the method is comprising the step of displacing the inner frame in a longitudinal direction with respect to the outer frame.
- In one aspect the method is comprising the step of controlling the orientation of the elongated offshore structure or wind turbine device in the free hanging configuration.
- In one aspect the method is comprising the step of locking the inner frame to the outer frame.
- Embodiments of the invention will now be described in detail with reference to the enclosed drawings, where:
-
FIG. 1 illustrates a perspective view of a vessel; -
FIG. 2 illustrates a perspective view of a first or outer frame; -
FIG. 3 illustrates a perspective view of a second or inner frame; -
FIG. 4 a andFIG. 4 b illustrate a perspective view of parts of a connection device in closed and open position respectively; -
FIG. 4 c illustrates a perspective view of the connection device from below; -
FIG. 5 a illustrates a partial perspective view of the vessel, the inner frame and the outer frame assembled; -
FIG. 5 b andFIG. 5 c illustrate an enlarged perspective view of the locking device for locking the inner frame to the outer frame in open and closed position respectively; -
FIG. 6 a illustrates a partial top view ofFIG. 5 a; -
FIG. 6 b illustrates a partial front view of the embodiment ofFIG. 5 a; -
FIG. 7 a illustrates how the wind turbine device is supported on the inner frame on a land based facility; -
FIG. 7 b illustrates how the inner frame is pulled into the second frame of the vessel; -
FIG. 7 c illustrates the transportation to the installation site; -
FIG. 7 d illustrates a side view of the arrival at the installation site; -
FIG. 7 e andFIG. 7 f illustrate a side view and perspective view of the pivoting of the second frame in relation to the vessel respectively; -
FIG. 7 g-7 n illustrate the further steps of the installation procedure; -
FIG. 8 a-8 e illustrate a third embodiment of the invention; -
FIG. 9 a-9 e illustrate a fourth embodiment of the invention - A first embodiment of a
device 1 for installation or decommissioning of an offshorewind turbine device 2 will now be described in detail. First, it is referred toFIG. 7 a. Here it is shown that the offshore wind turbine device comprises atower device 3 with anacelle 4 and at least onerotor blade 5 provided in a first end thereof and afoundation 6 provided in a second end thereof. The wind turbine device is considered known for a skilled person and will not be described here in detail. It should be noted that the present invention might be utilized for both floating wind turbine devices anchored to the seabed and wind turbine devices for fixation to the seabed. Thefoundation 6 may typically be a jacket foundation, a mono pile foundation, a tripod foundation, a gravity foundation, a suction anchor foundation, etc. - It should be noted that the present invention may be used for installation or decommissioning of only some parts of the offshore wind turbine device, for example only the
foundation 6, i.e. without thetower device 3,nacelle 4 androtor blade 5. - It should also be noted that the present invention may be used for installation or decommissioning of other elongated offshore structures, for example jacket foundations for oil and gas facilities, etc.
- The
device 1 comprises avessel 10. Thevessel 10 of the present embodiment is a barge intended to be towed to the installation site by means of a towing vessel 8 (seeFIG. 7 c). Alternatively, thevessel 10 may be self-propelled by means of propulsion means etc. In the present embodiment, thevessel 10 comprises amain hull structure 10 a with a main deck, and two parallel protrudinghull elements slot 11 is provided between the two parallel protruding “catamaran-like”hull elements slot 11 is provided for submerging thefoundation 6 into the sea between the two parallel protrudinghull elements vessel 10 as shown inFIG. 1 is substantially U-shaped when viewed from above. - In
FIGS. 1 and 2 a longitudinal direction is indicated by line X-X. The longitudinal direction is in the description below used to indicate the longitudinal direction of thewind turbine device 2, more specifically to thetower device 3, when it is provided in a horizontal position on thedevice 1. - It is now referred to
FIG. 2 , where the first orouter frame 20 is illustrated. Theouter frame 20 comprises a firstouter frame element 20 a, a secondouter frame element 20 b and a thirdouter frame element 20 c, where the second and thirdouter frame elements outer frame element 20 a as shown inFIG. 2 . It should be noted that the width Wo of theouter frame 20 is less than the distance between the twohull elements - The
device 1 further comprises a pivoting system for pivoting theouter frame 20 in relation to thevessel 10. In the present embodiment, the pivoting system comprises pivotingpins 12 provided on thevessel 10 and pivotingopenings 21 provided in the second and thirdouter frame elements outer frame 20 may be pivoted with respect to the axis I-I indicated inFIGS. 1 and 2 , perpendicular to the longitudinal axis X-X. The pivoting system further comprises apivotal actuation device 25 fixed between theouter frame 20 and thevessel 10. In the present embodiment thepivotal actuating device 25 comprises one hydraulic cylinder device connected to the each of the second and thirdouter frame elements - The
device 1 further comprises aconnection device 40 for connection of thewind turbine device 2 to theouter frame 20 by means of alongitudinal actuation device 42. Thelongitudinal actuation device 42 is provided for moving thewind turbine device 2 in its longitudinal direction. In the present embodiment thelongitudinal actuation device 42 comprises a hydraulic cylinder device connected to the end of each of the second and thirdouter frame elements FIG. 2 . Theconnection device 40 comprises a first supportingelement 41 which may be fixed to the piston of the hydraulic cylinder devices by means ofconnection elements 47. The first supportingelement 41 is in the present embodiment a supporting ring fixed around thetower device 3. Theconnection elements 47 may be flexible connection elements such as chains, wires, cables etc. Alternatively, theconnection elements 47 may be rods connected to the pistons and/or first supportingelement 41 by means of articulated joints etc. - The purpose of the
connection elements 47 and the other elements of theconnection device 40 is to provide thewind turbine device 2 in a free hanging configuration when theouter frame 20 is in the substantially vertical position. The free hanging configuration allows an easy orientation of thefoundation 6 of the wind turbine device with respect to the seabed or with respect to anchoring devices (not shown) at the installation site. Thelongitudinal actuation device 42 is provided for lowering thewind turbine device 2 towards the seabed when thewind turbine device 2 is in the free hanging configuration. - The weight of the
wind turbine device 2 is in the vertical position carried by theouter frame 20 via the first supportingelement 41, theconnection elements 47 and thelongitudinal actuation device 42. - Consequently, by actuating the
pivotal actuation device 25, theouter frame 20 may be pivoted in relation to the vessel with an angle α between 0 and ca 100° (as indicated inFIG. 7 j). Here it can be seen that theouter frame 20 is pivotable in relation to thevessel 10 between a substantially horizontal position for transporting thewind turbine device 2 to the installation site and a substantially vertical position for installation of thewind turbine device 2 at the installation site. - In the embodiment described above, the free hanging configuration may be achieved when the pivotation of the
outer frame 20 is substantially perpendicular to the vessel (i.e. angle α≈90°, i.e. the position shown inFIG. 7 g. In this position, the orientation of thefoundation 6 may be limited due to its contact with theouter frame 20. Hence, by increasing the pivotation of theouter frame 20 further, for example to a position where the angle α is 95-100° (FIG. 7 j), the possibilities for orientation of thewind turbine device 2 increases. - The
longitudinal actuation device 42 may be pivotably mounted to theouter frame 20. In this way, the distance between theouter frame 20 and thewind turbine device 2 is increasing further when the angle α is increased to more than 90°. - For performing the orientation, the
vessel 10 may comprises control devices 14 (FIG. 1 ), for example winches or similar, for controlling the orientation of thewind turbine device 2 in the free hanging configuration. In the present embodiment, there is one winch in each end of the protrudinghull elements foundation 6 by means of wires. Thecontrol devices 14 may be used to rotate the wind turbine device around its longitudinal axis by using one of the winches, or by pulling thefoundation 6 away from theouter frame 20 by using both of the winches. - Alternatively, a dynamically positioned vessel may help with the orientation of the
wind turbine device 2. Moreover, if thewind turbine device 2 is being anchored to the seabed, orientation may be performed by slackening or tightening the anchoring wires. In yet an alternative, thevessel 10 itself may be self-propelled and dynamically positioned to orient thewind turbine device 2 correctly. - The use of the first embodiment described above will now be described. In a first step the
wind turbine device 2 is connected to theouter frame 20 via thelongitudinal actuation device 42, where theouter frame 20 is pivotable in relation to avessel 10. Thewind turbine device 2 is transported to the installation site in a substantially horizontal position, i.e. substantially parallel to thevessel 10. At the installation site theouter frame 20 is pivoted to a substantially vertical position, thereby providing that thewind turbine device 2 is in a free hanging configuration via thelongitudinal actuation device 42 when theouter frame 20 is in the substantially vertical position. In the free hanging configuration, the wind turbine device may be lowered towards the seabed by means of thelongitudinal actuation device 42. - Thereafter, the
foundation 6 of the wind turbine device is fixed to the seabed or anchored to the seabed by means of anchoring devices. In the present embodiment, aseabed supporting frame 9 has been preinstalled on, and is fixed to, the seabed. Theseabed supporting frame 9 is assumed known for a skilled person. Consequently, the foundation of the wind turbine device only has to be lowered down into theseabed supporting frame 9 before fixing the seabed supporting frame to the foundation of the wind turbine device. This represents a very efficient way of installing an offshore wind turbine device, since no interaction with the seabed itself is necessary. - In the embodiment described above, the
connection elements 47 are connected directly between the first supportingelement 41 and thelongitudinal actuation device 42. It should be noted that it would be possible to use only one connection element and one hydraulic cylinder as thelongitudinal actuation device 42. A free hanging configuration would still be achieved between the wires of thecontrol devices 14 and the only oneconnection element 47. - A second embodiment will now be described. In the second embodiment, the
connection device 40 comprises across bar 43 slidingly arranged in relation to theouter frame 20 by means of thelongitudinal actuation device 42. Thecross bar 43 is showed in detail inFIGS. 4 a and 4 b. Eachend 44 of the cross bar comprises different connection interfaces: afirst connection interface 44 a for supporting thecross bar 43 between the second and thirdouter frame elements outer frame elements second connection interface 44 b for connection to thelongitudinal actuation device 42, for example lugs for connection to the piston of thelongitudinal actuation device 42; and athird connection interface 44 c, for example lugs, for connection to theconnection elements 47. In the present embodiment thelongitudinal actuation device 42 comprises two hydraulic cylinders. Moreover, there are twoconnection elements 47, connected between the first supportingelement 41 and thecross bar 43, i.e. to each of the third connection interfaces 44 c of thecross bar 43. - The
connection device 40 may comprise a second supportingelement 45 for releasable connection of thewind turbine device 2 in relation to the outer frame 20 (FIG. 4 a, 4 b). In the present embodiment, the second supportingelement 45 comprises two lockingarms 45 a pivotably connected to thecross bar 43, where the lockingarms 45 a may be opened and closed by means ofhydraulic cylinders 46. Hence, thetower device 3 of thewind turbine device 2 may be releasably locked to thecross bar 43. In should be noted that thehydraulic cylinders 46 in the present embodiment is not provided for carrying the weight of the wind turbine device when in the vertical position, they are only locking thetower device 3 with respect to transverse movement of the tower device, not axial movement. Theconnection device 40 also comprises a rear protrudingpin 48 as shown inFIG. 4 c. It is now referred toFIG. 3 andFIG. 5 a-c andFIG. 6 a-b. Thedevice 1 according to the second embodiment may comprise an inner orsecond frame 30 provided inside theouter frame 20. The inner frame comprises a firstinner frame element 30 a, a secondinner frame element 30 b and a thirdinner frame element 30 c, where the second and thirdinner frame elements inner frame element 30 a as shown inFIG. 2 . It should be noted that the width Wi of theinner frame 30 is less than the distance between the second and thirdouter frame elements outer frame 20. As shown inFIG. 5 a, theinner frame 30 may be located inside theouter frame 20. - The
inner frame 30 is displaceable in a longitudinal direction with respect to theouter frame 20. Theinner frame 30 may for example comprise roller devices, skid pads or wheels for rolling into theouter frame 20. This will be described more in detail below. Moreover, alocking device 60 may be provided for locking theinner frame 20 to theouter frame 30. InFIGS. 5 b and 5 c one example of such a locking device is illustrated. The locking device comprises a toothed bar fixed to the inner frame and a movable locking arm fixed to the outer frame for locking to the toothed bar. In the open position, the inner frame may be moved in relation to the outer frame, and in the locked position this movement is prevented. It should be noted that theouter frame 20 may comprise onesuch locking device 60 on each side. - As shown in
FIG. 3 , the inner frame comprises first supportingdevices wind turbine device 2 in the substantially horizontal position during transportation to the installation site. The first supportingdevices tower device 3, where the substantially semi-circular surfaces are fixed to the firstinner frame element 30 a, the secondinner frame element 30 b and the thirdinner frame element 30 c by means of supporting bars. It should be noted that the inner frame may comprise only one of the respective first supportingdevices foundation 6 of thewind turbine device 2 will normally be bearing against or supported by theinner frame 30. - The
inner frame 30 may also comprise a crossbar supporting device 33 for supporting thecross bar 43 in relation to theinner frame 30. In the present embodiment, the crossbar supporting device 33 comprises an opening for receiving the rear protrudingpin 48 of theconnection device 40. The crossbar supporting device 33 is configured to release the support of thecross bar 43 in the substantially vertical position. When the pivotation of the outer frame reaches an angle of 90° or more, the rear protrudingpin 48 is no longer supported by the crossbar supporting device 33, and consequently, the abovementioned free hanging configuration is achieved. Thecross bar 43 may now be lowered (and if necessary raised) in relation to theinner frame 30. Please note that theinner frame 30 should be locked to the outer frame before pivoting the outer frame in relation to the vessel. - The method for installation of the
wind turbine device 2 by means of the second embodiment will now be described. As described above, aseabed supporting frame 9 has been preinstalled on, and is fixed to, the seabed. - It is now referred to
FIG. 7 a, where theinner frame 30 is separated from theouter frame 20 and thevessel 10. Theinner frame 30 is here movable on rails on a pier. - As shown, the wind turbine device is supported in a horizontal position on the
inner frame 30. More specifically, thefoundation 6 is supported directly on theinner frame element 30 a and thetower device 3 is supported on the first supportingdevices - Moreover, parts of the
connection device 40 is here connected to theinner frame 30, i.e. the crossbar supporting device 33 is supporting thecross bar 43 in relation to theinner frame 30 since the rear protrudingpin 48 is inserted into the opening of the crossbar supporting device 33. Moreover, the first supportingelement 41 is connected around thetower device 3 and is connected to thecross bar 43 via theconnection elements 47. Moreover, the second supportingelement 45 of the connection device is connected to the tower device. - In
FIGS. 7 a and 7 b, theinner frame 30 with theconnection device 40 is run onto or into theouter frame 20. This can be performed by using thelongitudinal actuation devices 42, for example connected to theinner frame 30 by means of chains or similar (shown inFIG. 7 a), and stepwise pulling the inner frame towards the outer frame. Alternatively, a separate vehicle etc may be used to push the inner frame and theconnection device 40 into or onto theouter frame 20. - The
inner frame 30 may now also be locked to theouter frame 20 by means of thelocking device 60, however this is strictly not necessary. Moreover, thecross bar 43 is being connected to thelongitudinal actuating devices 42 via theconnection interface 44 b. - The
device 1 is now transported to the installation site with thewind turbine device 2 in the substantially horizontal position. InFIG. 7 c it is shown that a towingvessel 8 is used. -
FIG. 7 d illustrates the situation on the installation site, with theseabed supporting frame 9 provided on the seabed. Note thewires 14 a connected between thecontrol devices 14 and thefoundation 6. - In
FIGS. 7 e and 7 f theouter frame 20 is pivoted in relation to thevessel 10 by means of thepivotal actuation devices 25. - In
FIGS. 7 g and 7 h, theouter frame 20 has reached a substantially vertical position. If necessary, the lockingdevice 60 could have been unlocked for adjusting theinner frame 30 with respect to theouter frame 20 in the horizontal position or before theouter frame 20 reaches the vertical position. This could for example be performed to avoid that thefoundation 6 crashes into the seabed during the pivotation. - As described above, the wind turbine device is supported by the
connection device 40 in relation to the outer frame. Due thecross bar 43 and its support in the supportingdevice 33 of theinner frame 30, the inner frame is also supported with respect to the outer frame. Hence, the lockingdevice 60 is not necessary for supporting the inner frame with respect to the outer frame as long as the rear protrudingpin 48 of thecross bar 43 is supported by the supporting device. This would be the case for pivotation angles between 0° and 90°. - When the pivotation angle exceeds 90°, the protruding
pin 48 will exit from the supportingdevice 33. Before that happens, the inner frame should be locked to the outer frame by means of thelocking device 60. - Hence, by pivoting the
outer frame 30 further, for example to the position shown inFIGS. 7 i and 7 k, thecross bar 43 is released from the crossbar supporting device 33 of the inner frame, since thelongitudinal actuation devices 42 are pivotably mounted to theouter frame 20 as described above. Hence, the weight of the wind turbine device provides that thelongitudinal actuation devices 42 are hanging downwardly from the outer frame. Consequently, the wind turbine device is in a substantially vertical position, even though the outer frame is pivoted to an angle more than 90°. - The wind turbine device is now in a free hanging configuration and may be lowered towards the seabed by means of the longitudinal actuation device 42 (
FIGS. 7 j and 7 l). The positioning of the wind turbine device may be performed by moving the vessel with respect to the seabed. - The tower device may now be released from the
cross bar 43 by opening the second supportingelement 45. Now, thecontrol device 14 may control the orientation of the foundation with respect to theseabed supporting frame 9 by means of thewires 14 a before the foundation is lowered further onto theseabed supporting frame 9. - The foundation is then fixed to the
seabed supporting frame 9, and theconnection device 40 is released from the wind turbine device allowing thevessel 10 with the outer andinner frames - For retrieval or de-commisioning of offshore wind turbine devices, the reverse procedure may be utilized.
- A third embodiment is shown in
FIG. 8 a-8 e. The same reference numbers are used as in the embodiments described above, and will therefore not be described in detail herein. - In
FIG. 8 a it is shown that the device according to the invention is used to install afoundation 6 of awind turbine device 2, i.e. thetower device 3 with anacelle 4 and rotor blade(s) 5 are installed on thefoundation 6 in a subsequent operation by means of a similar or a different installation vessel. It should also be noted that in this embodiment, there might be no supportingframe 9 on the seabed, since thefoundation 6 comprisessuction anchor foundations 6 a. - The
vessel 10 is in this embodiment comprising propulsion means 15. In the present embodiment, these propulsion means 15 may be elevated to the position ofFIG. 8 a during transportation, and may be lowered to the position ofFIG. 8 b for positioning and orienting the vessel at the installation site. - In this embodiment, the device comprises a
vessel 10, a first orouter frame 20 and a second orinner frame 30 pivotable in relation to the vessel as described above. - The
pivotal actuation device 25 for pivoting theouter frame 20 in relation to the vessel is in this embodiment comprising a hydraulic actuator connected to theouter frame 20 and is comprising a climbing beam device in contact with thevessel 10, as shown inFIG. 8 b. - The
connection device 40 of the present embodiment comprises a first supportingelement 41 connected to the top end of thefoundation 6. Across bar 43 and aconnection element 47 is provided for connecting the first supportingelement 41 to theouter frame 20 via thelongitudinal actuation device 42 and for supporting theconnection device 40 to theinner frame 30. SeeFIGS. 8 b and 8 c. - The
longitudinal actuation device 42 here comprises a chain climbing device with achain 42 a. The present embodiment comprises two suchlongitudinal actuation devices 42, as shown inFIG. 8 b. - The free hanging configuration is shown in
FIG. 8 c. Here, it is shown that the first supportingelement 41 is hanging freely with respect to the inner andouter frame longitudinal actuation device 42 can now be used to lowering thefoundation 6 towards the seabed, while thecontrol devices 14 can be used to control the orientation of thefoundation 6 with respect to the seabed together with thepropulsion devices 15. - A second alternative embodiment is shown in
FIG. 9 a-9 e. The same reference numbers are used as in the embodiments described above, and will therefore not be described in detail herein. - In
FIG. 9 a it is shown that the device according to the invention is used to install afoundation 6 of awind turbine device 2, i.e. thetower device 3 with anacelle 4 and rotor blade(s) 5 are installed on thefoundation 6 in a subsequent operation by means of a similar or a different installation vessel. It should also be noted that in this embodiment, there is no supportingframe 9 on the seabed, thefoundation 6 comprisessuction anchor foundations 6 a. - In this embodiment, the device comprises a
vessel 10 and first orouter frame 20 pivotable in relation to the vessel. Hence, in this embodiment, there is no second orinner frame 30. - In his embodiment, the centre of gravity of the
foundation 6 is provided over theslot 11 of thevessel 10, i.e. to the left of thepivotal pins 12 defining the pivotal axis I-I inFIG. 9 b. Consequently, an alternativepivotal actuation device 25 may be used. In the present embodiment, thepivotal actuation device 25 comprises two winches, each provided on the respective protrudinghull structures foundation 6. Hence, when the winches are releasing their wires, thefoundation 6 andouter frame 20 will rotate due to the weight of thefoundation 6 to its substantial vertical position shown inFIG. 9 c. - The
connection device 40 of the present embodiment comprises a first supportingelement 41 connected to the top end of thefoundation 6. Theconnection element 41 is connected to theouter frame 20 via thelongitudinal actuation device 42. Thefoundation 6 is supported directly against theouter frame 20 in the horizontal position, i.e. there is nocross bar 43 andconnection elements 47. - The
longitudinal actuation device 42 here comprises a chain climbing device with achain 42 a. Thechain 42 a is connected directly to the first supportingelement 41. The present embodiment comprises one suchlongitudinal actuation device 42, as shown inFIG. 9 b. - The free hanging configuration is shown in
FIG. 9 c. Here, it is shown that the first supportingelement 41 is hanging freely with respect to theouter frame 20 and the first supportingelement 41 and thefoundation 6 are no longer supported by theouter frame 20. Thelongitudinal actuation device 42 can now be used to lowering thefoundation 6 towards the seabed, while thecontrol devices 14 can be used to control the orientation of thefoundation 6 with respect to the seabed. - It should also be noted that the first supporting
device 41 may comprise oneelement 41 a connected to theconnection device 40 and oneelement 41 b connected to thefoundation 6 orwind turbine device 2. Theelements foundation 6 is connected to theconnection device 40, but is separated from each other when disconnecting the foundation from theconnection device 40. This is for example indicated inFIG. 8 e. - It should be noted that the
vessel 10 may have many other suitable designs and configurations than the one illustrated inFIG. 1 . For example is the length of the vessel shorter than the length of thewind turbine device 2, but the invention is not limited to such embodiments.
Claims (23)
1. A device for installation of an elongated offshore structure, wherein the device comprises:
a vessel;
an outer frame pivotable in relation to the vessel between a substantially horizontal position for transporting the elongated offshore structure to the installation site and a substantially vertical position for installation of the elongated offshore structure at the installation site;
a connection device for connection of the elongated offshore structure to the outer frame via a longitudinal actuation device;
wherein the connection device comprises a first supporting element for providing the elongated offshore structure in a free hanging configuration when the outer frame is in the substantially vertical position, and
wherein the longitudinal actuation device is provided for lowering the elongated offshore structure towards the seabed when the elongated offshore structure is in the free hanging configuration.
2. The device according to claim 1 , wherein the elongated offshore structure is a wind turbine device comprising a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof.
3. The device according to claim 1 , wherein the connection device comprises a cross bar slidingly arranged in relation to the outer frame by means of the longitudinal actuation device.
4. The device according to claim 3 , wherein the first supporting element is connected to the cross bar.
5. The device according to claim 3 , wherein the connection device comprises a second supporting element for releasable connection of the elongated offshore structure in relation to the outer frame.
6. The device according to claim 1 , wherein an inner frame is provided inside the outer frame, wherein the inner frame comprising a first supporting device for supporting the elongated offshore structure in the substantially horizontal position during transportation to the installation site.
7. The device according to claim 6 , wherein the inner frame comprises a cross bar supporting device for supporting the cross bar in relation to the inner frame.
8. The device according to claim 7 , wherein the cross bar supporting device is configured to release the support of the cross bar in the substantially vertical position.
9. The device according to claim 6 , wherein the inner frame is displaceable in a longitudinal direction with respect to the outer frame.
10. The device according to claim 1 , wherein the longitudinal actuation device is pivotably mounted to the outer frame.
11. The device according to claim 1 , wherein control devices are provided to control the orientation of the elongated offshore structure in the free hanging configuration.
12. The device according to claim 5 , wherein a locking device is provided for locking the inner frame to the outer frame.
13. A method for installation of an offshore elongated offshore structure, wherein the method comprises:
connecting the elongated offshore structure to an outer frame via a longitudinal actuation device, wherein the outer frame is pivotable in relation to a vessel;
transporting the elongated offshore structure to the installation site in a substantially horizontal position;
pivoting the outer frame to a substantially vertical position at the installation site;
providing the elongated offshore structure in a free hanging configuration via the longitudinal actuation device when the outer frame is in the substantially vertical position;
lowering the elongated offshore structure towards the seabed by means of the longitudinal actuation device when the elongated offshore structure is in the free hanging configuration.
14. The method according to claim 13 , wherein the elongated offshore structure is a wind turbine device comprising a tower device with a nacelle and at least one rotor blade provided in a first end thereof and a foundation provided in a second end thereof.
15. The method according to claim 13 , further comprising the step of providing the connection device with a cross bar slidingly arranged in relation to the outer frame by means of the longitudinal actuation device.
16. The method according to claim 13 , further comprising the step of connecting the first supporting element to the cross bar.
17. The method according to claim 13 , further comprising the step of providing the connection device with a second supporting element for releasably connecting the elongated offshore structure in relation to the outer frame.
18. The method according to claim 13 , further comprising the step of providing an inner frame inside the outer frame, wherein the inner frame comprising a first supporting device for supporting the elongated offshore structure in the substantially horizontal position during transportation to the installation site.
19. The method according to claim 18 , further comprising the step of providing the inner frame with a cross bar supporting device for supporting the cross bar in relation to the inner frame.
20. The method according to claim 19 , further comprising the step of configuring the cross bar supporting device to release the support of the cross bar in the substantially vertical position.
21. The method according to claim 13 , further comprising the step of displacing the inner frame in a longitudinal direction with respect to the outer frame.
22. The method according to claim 13 , further comprising the step of controlling the orientation of the elongated offshore structure in the free hanging configuration.
23. The method according to claim 18 , further comprising the step of locking the inner frame to the outer frame.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20100320A NO331392B1 (en) | 2010-03-05 | 2010-03-05 | Method and apparatus for installing an offshore wind turbine device |
NO20100320 | 2010-03-05 | ||
PCT/NO2010/000422 WO2011108938A2 (en) | 2010-03-05 | 2010-11-18 | Method and device for installation of an elongated offshore structure |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130051925A1 true US20130051925A1 (en) | 2013-02-28 |
Family
ID=44542764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/582,860 Abandoned US20130051925A1 (en) | 2010-03-05 | 2010-11-18 | Method and device for installation of an elongated offshore structure |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130051925A1 (en) |
EP (1) | EP2542465A2 (en) |
KR (1) | KR20130048720A (en) |
CN (1) | CN102844234A (en) |
NO (1) | NO331392B1 (en) |
WO (1) | WO2011108938A2 (en) |
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CN103807115A (en) * | 2014-01-31 | 2014-05-21 | 中交一航局第二工程有限公司 | Offshore wind power generation set horizontally-assembling and integrally-overturning-and-erecting device and construction method thereof |
GB2539566A (en) * | 2015-06-11 | 2016-12-21 | Tidal Energy Ltd | Underwater structure and underwater structure installation and removal method |
NO20160289A1 (en) * | 2016-02-18 | 2017-07-31 | Joern Haugvaldstad Entpr As | A positioning device and an arrangement for installing a mono-column platform in the seabed of the sea |
EP3254946A1 (en) * | 2016-06-07 | 2017-12-13 | Jan De Nul N.V. | Workboat for anchor handling |
BE1024263B1 (en) * | 2016-06-07 | 2018-01-16 | Jan De Nul N.V. | Anchor handling vessel |
EP3677773A4 (en) * | 2017-11-23 | 2020-11-04 | Wuhan University Of Technology | Hydraulic tilt pushing type offshore wind turbine installation system |
NO20190831A1 (en) * | 2019-07-02 | 2021-01-04 | Roar Ramde | OFFSHORE POWER GENERATION SYSTEM |
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CN102424095A (en) * | 2011-11-11 | 2012-04-25 | 中交第一航务工程局有限公司 | Special vessel for vibration sinking of steel cylinder |
DK177683B1 (en) | 2012-08-30 | 2014-03-03 | Envision Energy Denmark Aps | Method of installing an offshore wind turbine and a transport vessel thereof |
KR101428197B1 (en) * | 2012-10-11 | 2014-08-08 | 주식회사 포스코 | Installing apparatus for offshore tower |
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Also Published As
Publication number | Publication date |
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KR20130048720A (en) | 2013-05-10 |
EP2542465A2 (en) | 2013-01-09 |
CN102844234A (en) | 2012-12-26 |
WO2011108938A2 (en) | 2011-09-09 |
NO20100320A1 (en) | 2011-09-06 |
WO2011108938A3 (en) | 2012-01-12 |
NO331392B1 (en) | 2011-12-12 |
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