Improvements in and relating to the assembly of structures

Abstract

A method for assembling an offshore wind turbine, such as a floating offshore wind turbine, is disclosed. The method includes transporting, in one or more vessels, a nacelle and a tower of the offshore wind turbine to an assembly area below a support device; suspending the tower and the nacelle from the support device; transporting a floating / floating base or a foundation body to the assembly area below the support device; and landing the tower on the floating / floating base or the foundation body and the nacelle on the tower. Also disclosed is a support device for assembling an offshore wind turbine, such as a floating offshore wind turbine.

Description

Technical Field

[0001] The present invention relates to a device / apparatus and / or system for assembling structures such as (offshore) structures, (offshore) wind turbines or (offshore) jackets. The present invention also relates to a method of deploying a device / apparatus or system for assembling (offshore) structures such as offshore structures, (offshore) wind turbines or (offshore) jackets. The present invention also relates to a method of assembling a structure or (offshore) turbine or jacket, such as a wind turbine or jacket, for example an offshore wind turbine or offshore jacket. The structure is preferably a floating / buoyant structure and / or is provided on a floating / buoyant body.

[0002] In particular, but not exclusively, the present invention relates to a method of assembling a wind turbine structure or jacket, for example intended for offshore use, and an apparatus for assembling a wind turbine or jacket.

Background Art

[0003] In the field of wind turbines, particularly offshore wind turbines, there is a general trend to install increasingly high-power wind turbines, for example turbines capable of outputting 10 megawatts or more. However, with the increase in power capacity, the physical dimensions of such wind turbines have also increased.

[0004] Historically, wind turbines, or at least assembled or semi-assembled components of wind turbines, could be manufactured and / or assembled at a first location and then transported by road to a further location for deployment and / or further assembly. However, due to the increase in their physical dimensions, the road transportation of the latest turbines, or of assembled parts of the latest turbines, is no longer practically possible.

[0005] Currently, wind turbines and their associated structures can be constructed separately on land and transported to an offshore site section by section. At the location, they can be moved to a fixed position and secured using slings and cranes.

[0006] This background art serves to set the scene for the skilled reader to better understand the following description. Accordingly, none of the above descriptions should necessarily be construed as admitting that the description is part of the state of the art or common general knowledge.

[0007] Further background information includes British Patent No. 2479232 (W3G SHIPPING LTD), which describes structures such as wind turbine structures for offshore facilities, including transport elements, such as annular protrusions configured to complementarily engage with engagement portions of clamps, which enable the structure to be transported using the clamps. The clamp may comprise two or more parts positioned around the structure. The wind turbine may be transported as a completed structure. Generally, the transport element is provided in an attachment area such as a tower. The tower is attached to a support such as a jacket. Devices are also described that permit the transport of wind turbine structures with clamps. In some cases, the device is also configured to change the effective center of gravity and / or the effective center of inertia of the associated structure. An orientation assembly comprising six actuators controlled by the use of positioning signals may be provided to permit relative movement of the clamp and thus the clamp structure with respect to the lifting device. The crane may transport the wind turbine between barges.

[0008] British Patent Specification No. 2479232 (W3G SHIPPING LTD) discloses a system such as an offshore system, the system comprising a wind turbine structure for a site such as an offshore site. The structure comprises a tower supporting a turbine and a transport element, the transport element being provided at the base of the tower and being part of a complementary fitting arrangement, the transport element being engageable with an engaging element of a clamp, the tower, and a device for allowing transport of the structure, the device comprising a clamp having an engaging element, the engaging element being another part of the complementary fitting arrangement, the engaging element being engageable with the transport element of the tower, and when the engaging element of the clamp engages with the transport element of the tower, the device is configured to allow raising and lowering of the structure at the site from the base of the tower using the clamp.

[0009] British Patent Specification No. 2582844 (W3G MARINE LTD) discloses a method of assembling a structure such as a wind turbine, the method comprising providing a lifting arrangement comprising a gantry disposed on and / or directly above one or more rails and lifting means coupled to the gantry, stacking a plurality of parts of the structure, and stacking a plurality of parts of the structure comprises disposing a first part of the structure relative to one or more rails by lifting the first part using the lifting means, configuring a clamping device to grip the first part, and transporting the clamping device along one or more rails to dispose it transportably, lifting a second part of the structure using the lifting means, disposing the first part under the second part by further transporting the first part gripped by the clamping device along one or more rails, lowering the second part onto the first part, and

[0010] Specification of Chinese Utility Model Patent No. 213445838 (NANTONG RUNJINI MARINE EQUIPMENT CO,LTD) describes an offshore wind turbine blade wave compensation platform including two trucks. The two trucks are fixedly connected to a gantry between opposite sides of the trucks, and are equally fixedly connected to a servo motor around the inner bottom of the gantry.

[0011] Specification of European Patent Application Publication No. 2058444 (FREYSSINET) describes a method for constructing a civil engineering structure and associated systems. The method includes positioning a second element under a fixed gantry crane having a lifting unit such as a crane hook. The element is lifted using the lifting unit. The first element is positioned under the fixed crane and under the second element. The second element is placed on the first element using the lifting unit. The fixed crane is arranged above or near a construction bench on which the civil engineering structure is constructed. The independent claims also include a system for constructing a civil engineering structure having a fixed lifting structure.

[0012] One or more aspects / embodiments of the present invention may or may not address one or more of the background problems.

Prior Art Documents

Patent Documents

[0013]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

[0014] An object of at least one embodiment of at least one aspect of the present invention is to avoid or at least mitigate at least one problem in the prior art.

[0015] An object of at least one embodiment of at least one aspect of the present invention is to provide a method and system that are technically simple and / or commercially cost-effective for assembling, for example, an (offshore) wind turbine structure or an (offshore) jacket for an (offshore) wind turbine, compared to the prior art.

[0016] According to the present invention, there are provided a device or apparatus and a system for assembling an (offshore) structure (such as an offshore wind turbine or a wind turbine generator (WTG)), a method of deploying a device or apparatus for assembling an (offshore) structure, and a method of assembling an (offshore) structure according to the appended claims and / or clauses.

[0017] According to a first aspect of the present disclosure, there is provided a device or apparatus for assembling a structure (such as an offshore structure, such as an offshore wind turbine or a jacket), the apparatus comprising a structure (which can be erected, for example, vertically) and a lifting structure.

[0018] The structure may be, for example, capable of being erected or assembled on site and / or may be capable of being disassembled or dismantled on site, for example.

[0019] The device / apparatus may comprise or provide an assembly area, for example, an area of water, for example, the seabed or floor of a body of water, for example, above the seabed. The assembly area may be provided, for example, below the lifting arrangement when erected. It will be appreciated that the device / apparatus may be used onshore or offshore, for example, in a quay.

[0020] The assembly area may be provided around, within an area or volume of, the device or apparatus. The lifting arrangement may be provided above the assembly area, for example directly above.

[0021] In one embodiment, the (erectable) structure may be deployable in a first state, or a folded state. The erectable structure may be deployable in a second state, an extended state, or an erected state. The erectable structure may be extendable or selectively movable from the first state to the second state. The erectable structure may be foldable, or further selectively movable from the second state to the first state. This selective deployment may facilitate the erectable structure being transported in a folded state to a location for assembling an (offshore) structure and then being extended and erected at that location. Further, this selective deployment may facilitate the erectable structure being folded and / or removed from the assembly area after the (offshore) structure has been assembled.

[0022] In other embodiments, the structure may be assembled and / or erected at a site or location. This embodiment facilitates the parts of the structure being transported individually to the site or at least not being assembled for the purpose of on-site assembly.

[0023] The structure may comprise a plurality of legs and / or top members. The legs may be connected to, or connectable to, the top member.

[0024] The lifting arrangement may be provided, in use, for example below the top member, for example directly below. The lifting arrangement may hang down from the top. The assembly area may be provided below the top, for example directly below.

[0025] In a preferred embodiment, the device or apparatus may comprise a tripod or tripod arrangement, or three legs. The tripod may comprise three legs. Alternatively, the device or apparatus may comprise a four-leg structure.

[0026] Each leg may have its first end attached to the connecting member, for example, in a hinged manner. The connecting member may comprise the top of the structure / tripod / tetrahedron. The lifting arrangement may be attached to the connecting member or the top and / or may hang therefrom (vertically downwards). In this way, the lifting arrangement may be provided between the three legs.

[0027] Each leg may have a mud mat provided at its second end. The / each mud mat may be selectively buoyant (for transportation) or submersible (for erection).

[0028] In some embodiments, for example, in the case of a tetrahedron, a pair of opposing legs may be of the same length, which may be different from the other pair of opposing legs.

[0029] The structure may include a pyramid shape when erected, for example, a pyramid having a polyhedral base, a triangular base, a square base or a rectangular base. The structure may include a tetrahedron when erected.

[0030] The lifting arrangement may comprise an arrangement for connecting or supporting parts of the structure to be lifted. The configuration may comprise one or more hooks, shackles, etc. The lifting arrangement may comprise a single point lifting arrangement having a single lifting point for supporting a load such as a part or component of the structure.

[0031] The lifting arrangement may comprise one or more pulley configurations and / or a winch.

[0032] One or more lines (control / tether / tagging lines) may be provided between at least one, preferably each, of the legs, and the lines are adapted to be connected to a load (e.g., a part of the structure) lifted by the lifting arrangement. A connecting piece may be provided at the intersection of the lines, for example, below the top member.

[0033] One or more of the legs of the device or apparatus may comprise a (metal) lattice structure.

[0034] A further line or cable between adjacent legs may be provided at or near the distal end of the top member's leg.

[0035] At or near the end of each leg, further other lines may be provided, which extend (horizontally) so as to intersect at the (base) center point of the device, for example below the top member.

[0036] In an alternative embodiment, the device / apparatus may have support members provided on at least one or each leg. The / Each support member may be provided at or near each end of one of the legs distal from the top. The / Each support member may be deployed in a substantially vertical arrangement during use. The support members may provide support / strength to each leg so as to avoid buckling of the legs.

[0037] According to a second aspect of the present disclosure, there is provided a system for assembling a structure (such as an offshore structure, such as a wind turbine or a jacket, a wind turbine or a jacket, etc.), the system comprising a device according to the first aspect of the present disclosure.

[0038] The system may comprise a floating or buoyant body for transporting one or more parts of the structure to the assembly area.

[0039] The system may comprise one or more winches for controlling, for example, a lifting arrangement.

[0040] One or more winches may be provided on a further floating or buoyant body. The further floating or buoyant body may be adapted to be fastened to the legs of the device or apparatus. For example, the further floating or buoyant body may comprise slots or recesses for engaging with the legs of the device or apparatus and / or for receiving connecting members during transportation of the device / apparatus when in a folded state.

[0041] According to a third aspect of the present disclosure, there is provided a method of deploying a device or apparatus for assembling a structure such as an (offshore / floating) offshore structure, a wind turbine or a jacket, the method comprising: providing, or providing to, an assembly area or location a device or apparatus according to the first aspect of the present disclosure; deploying / erecting the device or apparatus; and including.

[0042] Preferably, the assembly location is an area of water, for example, the seabed or floor of a body of water, such as an area above the seabed.

[0043] The device / apparatus may stand or be installed on the seabed of a body of water, such as the seabed, when erected. The top and lifting arrangement may be provided above the surface level of the body of water.

[0044] The step of providing the device or apparatus at the assembly location may include, for example, using one or more vessels or barges to transport the device or apparatus or one or more of its parts / components, together or individually.

[0045] According to a fourth aspect of the present disclosure, there is provided a method of assembling a structure such as an offshore structure, a wind turbine or a jacket or a wind turbine, the method comprising: deploying a device or apparatus according to the method according to the third aspect of the present disclosure; transporting a first part of the structure to the assembly area; Lifting a first component using a lifting arrangement, transporting a floating / floating base or foundation body to the assembly area, connecting / clamping a first component of the structure to the floating / floating base body including.

[0046] The method may include the following subsequent steps, namely, transporting further components of the structure to the assembly area, lifting further components using the lifting arrangement, transporting the floating / floating base to the assembly area, lowering and / or connecting further components of the structure to a first / one component of the structure already provided on the floating / floating base including.

[0047] The structure may be a floating structure.

[0048] The structure is the following, namely, a plurality of parts or components, a segmented (offshore) structure, a floating / floating foundation, a monopile, a jacket (e.g., a tripod jacket, a four-leg jacket or a torsion jacket) and may include or comprise.

[0049] In the case of a structure comprising a wind turbine, the parts or components may be one or more of the following, namely, a column or tower (e.g., first and second column parts), a nacelle, a plurality of turbine blades (e.g., three turbine blades) including one or more.

[0050] In such a case, there may be a given number of components (e.g., six components), and thus there may be a requirement for the same given number of lifts, e.g., six lifts.

[0051] The method may comprise a tower for supporting the structure (components) during assembly.

[0052] During use, an arrangement may be provided for extending or increasing the height of the tower, e.g., at intervals, so as to lift the structure and / or the top of the structure.

[0053] According to a fifth aspect of the present disclosure, a method of assembling an offshore structure such as an offshore wind turbine or an offshore jacket is provided, the method comprising the following steps, namely, providing a lifting arrangement, wherein the lifting arrangement comprises a gantry disposed above and / or directly above an area of water and lifting means or devices coupled to the gantry, stacking a plurality of parts of the structure, wherein stacking a plurality of parts of the structure comprises transportably disposing a first part of the structure relative to or in the area of water, lifting the first part using the lifting means, configuring a clamping device or a holding device to grip the first part, transporting the clamping device or the holding device away from the area of water, lifting a second part of the structure using the lifting means, disposing the first part under or adjacent to the second part by further transporting the first part, gripped by the clamping device, into the area of water, stacking by lowering the second part onto or connecting it to the first part, and including.

[0054] The step of lifting the second part using a lifting means or device may include winding up and / or raising the second part upward to a height above the top level of the first part.

[0055] The method may include the step of fixedly coupling the second part to the first part by bolting, welding, and / or clamping.

[0056] The structure may be, for example, a wind turbine assembly such as an offshore wind turbine for supporting a wind turbine, or a jacket such as an offshore jacket.

[0057] The first part and / or the second part and / or one or more further parts may be at least one of a part of a tower or a nacelle or a turbine blade.

[0058] The method may include placing one / further part on the second part, lifting the further part using a lifting means or device, transporting the second part of the structure under the further part by transporting the second part to an area of water, lowering the further part onto or against the second part, and further including the step of stacking thereby.

[0059] The clamping device may be provided on a floating body or a buoyant body, for example, a buoyant foundation or an (upper) crown assembly.

[0060] The clamping device may be configured to support and / or clamp and / or grip at least a part of the structure in a vertical arrangement and / or a substantially upright configuration.

[0061] According to a sixth aspect of the present disclosure, a system for assembling a structure such as an (offshore) wind turbine or an (offshore) jacket is provided, the system comprising: a gantry disposed above and / or directly above an area of water; lifting means or arrangements coupled to the gantry; means or devices for transporting a part of the structure between the area of water; and the means or devices for transporting a part of the structure comprise a clamping device or a holding device.

[0062] The clamping device or holding device may be configurable between a clamping or holding configuration for gripping a part of the structure and a non-clamping or non-holding configuration.

[0063] The clamping device may be coupled or mounted to a floating or buoyant (base) body (e.g., a floating foundation or a (top) crown assembly or a barge).

[0064] The lifting means may comprise a winch and / or a pulley.

[0065] The system may be adapted to assemble an offshore wind turbine assembly or a wind turbine assembly or a jacket such as an offshore jacket assembly for a wind turbine.

[0066] The system may comprise a clamping and / or gripping system, the clamping and / or gripping system comprising: a clamping device for gripping at least a part of the wind turbine assembly; a floating or buoyant body; and the clamping device is mounted on the floating or buoyant body.

[0067] The clamping device may be configured to support at least a part of a wind turbine assembly or a jacket assembly in a vertical arrangement and / or in a substantially upright configuration.

[0068] The clamping device may be configured to engage with a flange or rim disposed on an outer surface of a part of the structure.

[0069] According to a seventh aspect of the present disclosure, there is provided a device or apparatus for assembling a structure (such as an offshore structure, a wind turbine or a jacket, etc.), the device or apparatus comprising an erectable structure (for example, an erectable structure vertically). The device or apparatus may comprise a lifting arrangement. Also disclosed are a method of erecting an erectable structure and a system comprising the erectable structure.

[0070] The erectable structure may comprise a multi-legged structure (such as a tripod or a quadripod, etc.).

[0071] In one embodiment, the erectable structure may be deployable in a first state or a folded state. The erectable structure may be deployable in a second state, an extended state, or an erected state. The erectable structure may be extendable or selectively movable from the first state to the second state. The erectable structure may be foldable, or may be further selectively movable from the second state to the first state. This selective deployment may facilitate the erectable structure being transported in a folded state to a location for assembling the (offshore) structure and then being extended and erected at that location. Further, this selective deployment may facilitate the erectable structure being folded and / or removed from the assembly area after the (offshore) structure has been assembled.

[0072] In an example, the erection of the erectable structure may be assisted by a post or column. The post or column may be mounted on a floating structure. The post or column may extend through a central portion of the erectable structure.

[0073] During the process of erecting an erectable structure, the central portion of the erectable structure may rise with respect to a post or column and, for example, "walk" up it.

[0074] The central portion may comprise or be coupled to a running gear module.

[0075] Such rising of the central portion of the erectable structure involves the use of one or more clamps, such as walking clamps.

[0076] In some examples, while the central portion of the erectable structure is being raised, a traction force may be applied to a tension member (such as a line) between the center and the base of the legs of the erectable structure (or generally towards the base).

[0077] In some examples, while the central portion of the erectable structure is being raised, a traction force may be applied to a tension member (such as a line) between the bases of the legs of the erectable structure.

[0078] The post may be first provided on a floating structure with the topmost part of the erectable structure placed around the post or column.

[0079] In an example, the erectable structure and / or the post or column may be initially provided as a plurality of parts that can be assembled (e.g., joined to each other) on a deck.

[0080] In an example, the erectable structure may be installed as a plurality of parts that are joined to each other on a deck and / or lowered onto the topmost part of the post or column and / or assembled around the post or column.

[0081] In some examples, the floating structure or at least a part thereof may be lowered and / or extended to the seabed to provide a reaction force for lifting the erectable structure to a fixed position.

[0082] In some examples, the floating structure may float during the erection of the erectable structure, provided that, for example, it has sufficient buoyancy and stability capacity to act on the load.

[0083] In some embodiments, the post or column may have one or more winches, such as linear winches, installed at the upper or topmost part.

[0084] One or more winches may be configured to lift the upper or topmost part of the erectable structure.

[0085] In an embodiment, the post or column may include one or more return sheaves having winches on, above, or substantially near the deck (such as the deck of a floating structure).

[0086] The post or column may be a primary post or primary column and may include at least one additional post or column disposed inside the primary post or primary column. The primary post or primary column and the at least one additional post or column may be arranged in a telescopic configuration.

[0087] During the assembly of the erectable structure, when the upper or topmost part of the erectable structure is raised so as to reach the topmost or upper part of the post or column, the at least one additional post or column may be extended, for example telescoped, to continue the process of raising the upper or topmost part of the erectable structure.

[0088] In some examples, the erectable structure may be erected without a lifting machine in place, such as a lifting machine that may be required to assemble structures such as wind turbines or jackets or offshore structures, offshore wind turbines or offshore jackets.

[0089] In such examples, the lifting machine may be lifted in place, for example at the upper part of the erectable structure, following the erection of the erectable structure.

[0090] In some examples, the erectable structure may have some of its structural components that are lifted in place following the initial erection of the structure. In one example, such structural components may also form part of a platform for a lifting machine.

[0091] In an example of use, the lifting machine may be configured to be lowered and / or removed for purposes such as servicing, maintenance, repair, storage, and the like.

[0092] In some examples, the wind damage of the erectable structure may be reduced by removing at least a part of the erectable structure, particularly the upper part of the erectable structure. As an example, a roof or a safety area for personnel who may only be required during operation may be removed to reduce wind damage.

[0093] In some examples, to reduce the tendency to buckle, one or more parts or components of the erectable structure that are lifted after the initial erection of the erectable structure may be used to increase the rigidity of the erectable structure.

[0094] In some examples, such as when the erectable structure includes a tripod, mudmats may be provided at the base portion of each leg. Such mudmats may have buoyancy that can extend from their decks, and when on the seabed, their uppermost or upper parts may be substantially at or above the waterline. Advantageously, this may help to sink the mudmat in place.

[0095] In some examples, the mudmat is ballasted to provide lateral stability from forces such as wind and / or tidal forces during their operation. In some examples, such ballast may be achieved by at least one of pumping water or other high density materials to provide a gravity anchor (such as mud or hematite, sheet piles around the mudmat, pile anchors, suction anchors, chain-attached anchors, wires or ropes), and / or fastening a line to the shore.

[0096] According to an eighth aspect of the present disclosure, a system for assembling a structure (such as an offshore structure, such as a wind turbine or a jacket, a wind turbine or a jacket) is provided, the system comprising a device or apparatus according to the seventh aspect of the present disclosure.

[0097] According to a ninth aspect of the present disclosure, an apparatus for assembling a structure such as a wind turbine or a jacket is provided. The apparatus comprises a first structure (e.g., an erectable structure) comprising a first plurality of legs connected by a first connection arrangement. The apparatus comprises a second structure (e.g., a second erectable structure) comprising a second plurality of legs connected by a second connection arrangement. The apparatus comprises an elongate structure extending between the first and second erectable structures. The apparatus comprises a lifting arrangement configurable to move a load along the elongate structure between the first and second erectable structures.

[0098] Advantageously, the first and second erectable structures are provided together with a lifting arrangement configurable to move a load along an elongate structure between the first and second erectable structures, enabling the assembly of structures such as wind turbines without the need to repeatedly move any base or foundation on which the structure can be assembled. That is, in use, components of the structure may be provided under the first structure and then lifted by the lifting arrangement to an assembly site under the second structure. The reduction in the movement of any base or foundation on which the structure can be assembled advantageously may reduce operating costs, shorten assembly times, reduce the complexity of the assembly operation, and / or reduce the risk to personnel.

[0099] The first and / or second erectable structures may be deployable in a first state, i.e., a folded or stowed state, and a second state, i.e., an extended state. The first and / or second erectable structures may be erectable extendably from the first state to the second state or alternatively movable. The first and / or second erectable structures may be foldable, stowable, or further alternatively movable from the second state to the first state.

[0100] Advantageously, the first and / or second erectable structures may be transported to the assembly site in the first state, i.e., the folded or stowed state. This advantageously may reduce transportation costs and increase the range of locations where the disclosed apparatus can be used.

[0101] As will be described in more detail below, the apparatus may define and / or include an assembly area (e.g., an area of water (e.g., above the bottom or floor of a body of water, e.g., the seabed)) below the lifting arrangement when erected. The assembly area may be provided, for example, below the lifting arrangement, e.g., directly below, when erected. The assembly area may be provided within the perimeter, area, or volume of the device or apparatus. The lifting arrangement may be provided above the assembly area, e.g., directly above.

[0102] The first connection arrangement may include a first top member that substantially defines the first tops of the first plurality of legs.

[0103] That is, the first plurality of legs may be arranged to intersect or substantially intersect at the point defined by the first connection arrangement. Thus, in some embodiments, the first plurality of legs may, together with the first connection arrangement, substantially define a pyramidal structure, and the first connection arrangement may substantially define the top of the pyramidal structure. The first connection arrangement may include a plurality of components such as struts, trusses, and / or couplings.

[0104] The second connection arrangement may include a second top member that substantially defines the second tops of the second plurality of legs.

[0105] For example, in some embodiments, the second plurality of legs may also form or intersect at a top. As will be described in more detail below, in some embodiments, the second plurality of legs may form a pair of shear legs or an A-frame together with the second top member.

[0106] The elongate structure may extend directly below the first top and / or the second top.

[0107] Advantageously, by extending beneath the first top and / or the second top, the first and second erectable structures may provide a maximum amount of structural support to the elongate structure, thereby ensuring that a sufficiently heavy load can be lifted by the lifting arrangement without damaging or overly distorting the first and second erectable structures.

[0108] The first erectable structure may comprise a tripod or a tripod arrangement. The first plurality of legs may have exactly three legs.

[0109] In some examples, the first erectable structure may substantially correspond to a structure of the first aspect (erectable, e.g., vertically erectable).

[0110] The first erectable structure may comprise a four-legged body or a four-legged arrangement. The first plurality of legs may have exactly four legs.

[0111] That is, in some embodiments, the first erectable structure may be formed from, for example, one or more gantry cranes or the like.

[0112] The second erectable structure may comprise a tripod or a tripod arrangement. The second plurality of legs may have exactly three legs.

[0113] In some examples, both the first and second erectable structures may each comprise a tripod arrangement.

[0114] The second erectable structure may comprise a pair of shear legs. The second erectable structure may comprise a pair of shear legs or an A-frame arrangement. The second plurality of legs may have exactly two legs.

[0115] Advantageously, the A-frame or pair of shear legs provides an easily installable and foldable support structure. Only two legs are required, thereby reducing the cost, complexity, and installation time for a tripod arrangement.

[0116] In certain embodiments, the first erectable structure may be implemented as a tripod arrangement having three legs, and the second erectable structure may be implemented as a pair of shear legs or an A-frame arrangement.

[0117] Each leg of the first plurality of legs may be attached to the first connection arrangement at or substantially at its respective first end.

[0118] Each leg of the second plurality of legs may be attached to the second connection arrangement at or substantially at its respective first end.

[0119] Each of the first and / or second connection arrangements may comprise one or more components. For example, each of the first and / or second connection arrangements may comprise a truss, a strut, etc., and may be coupled to the legs by couplings such as pins, bolts, etc.

[0120] Each leg of the first and second pluralities of legs may be provided with a mudmat at its respective second end. Optionally, the / each mudmat may optionally be buoyant or submersible.

[0121] In some exemplary embodiments, the mudmat may be shared between at least one leg of the first plurality of legs and at least one leg of the second plurality of legs.

[0122] Each leg of the second plurality of legs may be hingedly coupled to its respective mudmat at the second end.

[0123] That is, each leg of the second plurality of legs may be configured or configurable to pivot with respect to its respective mudmat at the second end.

[0124] The elongated structure may comprise a beam or a truss. Optionally, the elongated structure may comprise a rail, channel or guide configured such that at least a part of the lifting arrangement is moved or conveyed along it.

[0125] The cantilever portion of the elongated structure may extend from the second erectable structure in a direction away from the first extensible structure.

[0126] In one example of use, the cantilever portion may be used to install a blade on a wind turbine structure.

[0127] Optionally, the cantilever portion may be a tapered portion.

[0128] In one example, the cantilever portion may be tapered because it has a lower weight support requirement than the main portion of the elongated structure. In a non-limiting example, the main portion of the elongated structure may be configured to support a weight in the region of 1200 tons (e.g., with appropriate dimensions and structural integrity) sufficient to lift a tower structure and / or part of a nacelle of a wind turbine. In such a non-limiting example, the tapered cantilever portion of the elongated structure may be configured to support a weight in the region of 200 tons (e.g., with appropriate dimensions and structural integrity) sufficient to lift a blade of a wind turbine structure.

[0129] Advantageously, the tapered portion requires less material than the non-tapered portion, so the associated weight and manufacturing costs are reduced.

[0130] The lifting arrangement may comprise an arrangement for connecting or supporting parts of the structure to be assembled.

[0131] For example, the lifting arrangement may comprise at least one of a pulley, a winch, a line, a hook, etc. The lifting arrangement may comprise devices such as a lifting clamp, a gripping device, a support platform, a cage, etc. for supporting and / or holding and / or fastening a component to be lifted by the lifting arrangement.

[0132] The lifting arrangement may comprise one or more hooks or shackles.

[0133] The lifting arrangement may comprise a single-point lifting arrangement.

[0134] The lifting arrangement may comprise one or more pulleys and / or winch arrangements.

[0135] At least one or each leg of the first plurality of legs and / or the second plurality of legs may comprise a lattice or truss arrangement.

[0136] Each leg of the first and / or second plurality of legs may be configured to be extendable.

[0137] Optionally, each leg of the first and / or second plurality of legs may be configured to extend by insertion of an extension portion to the respective leg.

[0138] In some examples, the extension of one or more legs may be performed without substantially folding or substantially disassembling either the first or the second structure. For example, the extension of the leg may be achieved by supporting the leg, lengthening the leg such as by providing a gap or space between portions of the leg, and inserting an extension portion that may comprise at least one beam, truss, strut, etc.

[0139] According to a tenth aspect of the present disclosure, there is provided a system for assembling a structure such as a wind turbine or a jacket, comprising the apparatus according to the ninth aspect.

[0140] The system may include a first body that transports one or more components of a structure to an assembly area provided below at least a portion of the lifting arrangement. The first body may be a floating or buoyant body. Optionally, the system may include a first stabilizing arrangement for stabilizing the first body with respect to the bottom or floor of a body of water below the lifting arrangement.

[0141] The first body may include, for example, a raft, a ship, or the like.

[0142] The system may include a second body for assembling the structure. Optionally, the system may include a second stabilizing arrangement for stabilizing the second body with respect to the bottom or floor of a body of water below the lifting arrangement. Optionally, the second body may be a floating or buoyant body.

[0143] The second body may include, for example, a raft, a ship, or the like.

[0144] Advantageously, by stabilizing the second body, the structure can be effectively assembled on a stationary platform support. This reduces the risk of damage to the components of the structure being assembled, mitigates the effects of weather, tides, currents, etc. on the assembly procedure, and can simplify the assembly process.

[0145] Similarly, in embodiments where the first body is also stabilized, the components of the structure may be effectively lifted from a stationary body and assembled on an effectively stationary platform support, such as a stationary-to-station lift. In this case as well, the risk of damage to the components of the structure being assembled is further reduced, the effects of weather, tides, currents, etc. on the assembly procedure are mitigated, and the assembly process can be simplified.

[0146] The first and / or second stabilization arrangement may comprise at least one panel or member. The at least one panel or member may comprise an inflatable element. The at least one panel or member (e.g., the inflatable element) may comprise at least one layer of drop stitch material (e.g., a drop stitch inflatable material).

[0147] In one example, the drop stitch material, or a panel, member, element, etc. formed from the drop stitch material, may be configured to adopt a particular desired shape or configuration when inflated. Further, the drop stitch material (or the element, member, etc. formed from such material) may be substantially rigid when inflated.

[0148] For example, a panel of drop stitch material or a stack of panels may provide temporary buoyancy under the first or second body, instead of using a raft or a ship (or in addition to in some exemplary embodiments).

[0149] Advantageously, the use of drop stitch material can provide a means having a controllable amount of air, and thus a controllable means of generating stabilizing buoyancy.

[0150] In one example, an inflatable bag whose volume of the inflated portion can be controlled may be disposed under the body, for example under the hull of the body, and then inflated, thereby reducing the draft. The body can then be lowered to the seabed using variable buoyancy, for example in the same manner as a submersible raft.

[0151] According to an eleventh aspect of the present disclosure, a method of deploying an apparatus for assembling a structure such as a wind turbine or a jacket is provided. The method includes providing the apparatus according to the ninth aspect at or to an assembly area or location. The method includes deploying / erecting the apparatus.

[0152] Deploying / erecting the device may include erecting the first erectable structure such that when erected, it stands / sits on the bottom of the water mass.

[0153] Deploying / erecting the device may include erecting the second erectable structure such that when erected, it stands / sits on the bottom of the water mass.

[0154] In one example, the second erectable structure may be erected using at least one line or chain extending from and / or through the first erectable structure. That is, the legs of the second erectable structure may be assembled and / or joined in a first position (e.g., a substantially horizontal arrangement), and then a pulling force may be applied to the second erectable structure using one or more lines to move the second erectable structure to a second position (e.g., a more upright orientation).

[0155] Deploying / erecting the device may include using a final lifting device, such as a lifting device coupled to the first erectable structure and / or the second erectable structure, to lift the elongate structure.

[0156] Deploying / erecting the device may include coupling the elongate structure to the first and second erectable structures.

[0157] In certain embodiments, the elongate structure may be lifted and coupled to the first and second erectable structures after the first and second erectable structures are erected.

[0158] In some embodiments, the elongate structure may be configured to be separated and / or lowered from the first and second erectable structures without, for example, folding or disassembling the first and second erectable structures. Advantageously, this may allow for the transport of the elongate structure for maintenance.

[0159] In some embodiments, the elongate structure may be configured to raise, e.g., lift itself from a support, such as a raft, to a position for attachment to first and second erectable structures. For example, a lifting arrangement (e.g., a lifting arrangement commonly used in the assembly of structures that can be coupled to the elongate structure) may be configured to lift the elongate structure to a position suitable for attachment to the first and second erectable structures.

[0160] Furthermore, such a stationary-to-stationary lift arrangement may advantageously permit the use of relatively shallow assembly ports.

[0161] The elongate structure may be provided with a lifting arrangement. The lifting arrangement may be configurable to move a load along the elongate structure between the first and second erectable structures. After deployment / erection of the device, the lifting arrangement may be provided above the surface level of the water mass.

[0162] Erecting the second erectable structure may, in a hinged arrangement, include coupling each end of the second plurality of legs to respective support structures, such as mudmats. Each of the second plurality of legs may be arranged to extend in a first direction in a first state, i.e., a folded or stowed state.

[0163] Deploying / erecting the device may include transitioning the second erectable structure from a first state, i.e., a folded or stowed state, to a second state, i.e., an extended state, by rotating each of the second plurality of legs about a hinged arrangement such that each of the second plurality of legs is arranged to extend in a second direction.

[0164] The second direction may be more upright than the first direction.

[0165] That is, in one example, the first direction may be substantially horizontal and the second direction may be closer to the vertical direction than the first direction.

[0166] In some examples, the second erectable structure may be lowered and / or folded and / or disassembled when not in use. Advantageously, this can reduce visual intrusion. In an example, the second erectable structure may be lowered and / or folded and / or disassembled by pivoting the second erectable structure about a hinged point of placement and / or reacting from the first erectable structure.

[0167] According to a twelfth aspect of the present disclosure, a method of assembling a structure such as a wind turbine or a jacket is provided. The method may include deploying the apparatus according to the method of the eleventh aspect.

[0168] The method may include disposing a first base or body in an assembly area substantially below at least a portion of the first erectable structure.

[0169] The method may include disposing a second base or body in an assembly area substantially below at least a portion of the second erectable structure.

[0170] The method may include assembling the structure by configuring a lifting arrangement to lift components of the structure from the first base or body towards the second base or body.

[0171] The first base or body may comprise a floating / floating barge or vessel for carrying components.

[0172] Disposing the first base or body in the assembly area may include stabilizing the first base or body against the bottom or floor of the body of water below the lifting arrangement.

[0173] Stabilizing the first base or body may include configuring a stabilizing arrangement, such as a jack, to limit movement of the first base or body relative to the water bottom or floor. As described above, in some embodiments, the stabilizing arrangement may include a panel or member comprising an inflatable element and / or a drop stitch material.

[0174] Stabilizing the first base or body may include mooring the first base or body.

[0175] The second base or body may comprise a floating / floating vessel, such as a floater for a wind turbine, for supporting the assembled structure.

[0176] Disposing the second base or body in the assembly area may include stabilizing the second base or body relative to the water bottom or floor of the water mass below the lifting arrangement.

[0177] Optionally, stabilizing the second base or body may include disposing the second base or body on a grounded vessel.

[0178] Optionally, stabilizing the second base or body may include disposing the second base or body on a floating vessel.

[0179] Optionally, stabilizing the second base or body may include disposing the second base or body on the seabed. As described above, in some embodiments, a stabilizing arrangement for stabilizing the second base or body, such as a floater, may include a panel or member comprising an inflatable element and / or a drop stitch material.

[0180] Optionally, stabilizing the first base or body may include controlling the volume or air within one or more inflatable elements disposed below and / or around at least a portion of the second base or body.

[0181] Advantageously, this allows an assembled structure, such as a turbine, to float from a second base or body to a deep - sea location, for example, thus allowing the use of more assembly locations.

[0182] Optionally, stabilizing the second base or body may include mooring the second base or body.

[0183] Optionally, stabilizing the second base or body may include controlling the volume or air within one or more inflatable elements disposed below and / or around at least a portion of the second base or body.

[0184] The structure may comprise or include the following, namely, a plurality of parts or components, a segmented (offshore) structure, a floating / floating foundation, a monopile, and a jacket (e.g., a tripod jacket, a four - leg jacket, or a twisted jacket).

[0185] In the case of a structure comprising a wind turbine, the wind turbine may comprise a plurality of parts or components comprising one or more of the following, namely, a column or tower section, a nacelle, and a plurality of turbine blades.

[0186] According to a further aspect of the present disclosure, a method of assembling an offshore wind turbine, such as a floating offshore wind turbine, is provided. The method includes transporting, in one or more vessels, the nacelle and tower of the offshore wind turbine to an assembly area below a support device; lowering the tower and nacelle from the support device; transporting a floating / floating base or foundation body to the assembly area below the support device; and landing the tower on the floating / floating base or foundation body and the nacelle on the tower.

[0187] Advantageously, by suspending the nacelle and tower of an offshore wind turbine from a support device, the amount of marine operations required to assemble the offshore wind turbine, such as the amount of work involved in maneuvering a vessel around / from / between the support devices, can be reduced compared to other methods described herein. By relatively reducing the amount of marine operations, costs can be cut, safety can be improved, assembly time can be shortened, and the assembly of the offshore wind turbine can be simplified.

[0188] Furthermore, as will be described in more detail below, in some exemplary embodiments, both the support device and the floating / floating base or foundation body may be relatively grounded to the seabed or floor of the water mass in the assembly area. In this way, the disclosed method optionally provides a static-static lift operation for installing the nacelle on the tower, reduces the risk of damage to the tower and nacelle, and simplifies the assembly operation.

[0189] The nacelle and tower may be transported together to the assembly area on a single vessel.

[0190] Advantageously, the marine operations that may be required to transport the nacelle and tower to the assembly area are a one-time affair. In some embodiments, the blades may be transported on the same vessel. In some embodiments, part or all of the tower may be transported on a first vessel and the nacelle on a further vessel. The vessel may be a ship, a barge, etc. The vessel may comprise a barge known in the industry as a feeder barge.

[0191] It will be appreciated that the nacelle is a component of a wind turbine configured to be installed on top of the tower and may comprise, for example, at least one of a housing, a gearbox, a low-speed shaft, a high-speed shaft, a generator, a brake.

[0192] The tower may comprise a plurality of tower parts (for example, parts for assembling into a tower). The tower may be transported to the assembly area in a disassembled state. The method may include the step of assembling the tower from a plurality of tower parts onto one or more vessels before the (assembled) tower is suspended from the support device.

[0193] The method may include using a lifting arrangement of the support device to stack a plurality of tower parts to assemble the tower.

[0194] The lifting arrangement may include an arrangement for connecting or supporting one or more parts of the structure or component to be lifted. The arrangement may include one or more hooks, shackles, etc. The lifting arrangement may comprise a single-point lifting arrangement having a single lifting point for supporting the load, such as a part or component of the structure.

[0195] The lifting arrangement may comprise one or more pulley configurations and / or winches.

[0196] The system may comprise one or more winches for controlling the lifting arrangement, for example.

[0197] For example, the lifting arrangement may comprise at least one of a pulley, a winch, a line, a hook, etc. The lifting arrangement may comprise devices such as a lifting clamp, a gripping device, a support platform, a cage, etc. for supporting and / or holding and / or fastening the component lifted by the lifting arrangement.

[0198] The vessel may comprise a sea surface fixed grid framework for supporting a plurality of tower parts. Optionally, the grid framework can be raised to allow personnel access inside each tower part.

[0199] Suspending the nacelle from the support device may involve using one or more lines or slings to suspend the nacelle in a holding position. Optionally, the holding position may be offset from a vertical axis extending through the top of the support device.

[0200] That is, the nacelle can be effectively stored on the support device (e.g., below the top member of the support device) until landing on the tower becomes necessary.

[0201] In some embodiments, the nacelle is suspended from the support device before tower assembly and / or suspension. In other embodiments, the tower is assembled and / or suspended from the support device before suspending the nacelle from the support device.

[0202] Landing the nacelle on the tower can include the step of horizontally holding the nacelle from a holding position to a landing position substantially below the top of the support device.

[0203] The floating / floating base or foundation body may comprise a floater, a floating spar, a tension leg platform, a barge, or a semi-submersible offshore drilling platform, etc.

[0204] The method may include stabilizing the floating / floating base or foundation body against the seabed or floor of the water mass in the assembly area using a stabilizing arrangement including at least one of a jack, a mooring arrangement, an anchor arrangement, and / or a grounded ship.

[0205] Advantageously, by stabilizing the floating / floating base or foundation body against the seabed or floor of the water mass, it becomes possible to operate from a static lift to a static lift when landing the nacelle on the tower, minimizing the risk of damage to the tower and / or nacelle and simplifying the assembly work.

[0206] The method may include, on a ship, transporting a plurality of blades of an offshore wind turbine to an assembly area (e.g., a subsequent step).

[0207] The method may include using a lifting arrangement of a support device to lift each of the plurality of blades for attachment to a nacelle.

[0208] In some embodiments, a further lifting arrangement may be used to lift each of the plurality of blades for attachment to a nacelle, as will be described in detail below with reference to the drawings.

[0209] The support device may include a cantilever portion extending from a leg and / or the top of the support device. The method may include lifting each of the plurality of blades by one or more lines extending from the cantilever portion.

[0210] In an exemplary embodiment, the cantilever portion may be removable from the support device. In an exemplary embodiment, the cantilever portion may be configured to selectively extend from the support device, e.g., from a leg and / or a top member of the support device. For example, the cantilever portion may be hingedly connected to a support fixture.

[0211] The support device may include an erectable tripod structure and a lifting device. When the erectable tripod structure is erected, the assembly area may be provided below the lifting arrangement.

[0212] For example, the support device may be constituted by, or may substantially correspond to, a device or apparatus for assembling a structure of the first or seventh aspect, or a device for assembling a structure of the ninth aspect. The support device may include, for example, the tripod structure depicted in FIG. 3a or the tripod structure of FIG. 26.

[0213] According to a further aspect of the present disclosure, a support device for assembling an offshore wind turbine, such as a floating offshore wind turbine, is provided. The support device comprises a tripod structure that can be erected. The support device comprises a lifting arrangement for lifting the tower and / or nacelle of the offshore wind turbine. The lifting arrangement is provided above the assembly area when assembling the tripod structure. The support device includes a support arrangement for suspending the tower and / or nacelle from the erectable tripod structure.

[0214] For example, the support device may be constituted by, or may substantially correspond to, a device or apparatus for assembling the structure of the first aspect or the seventh aspect, or a device for assembling the structure of the ninth aspect. The support means may include, for example, the tripod structure depicted in Fig. 3a, the tripod with shear legs structure of Fig. 16, or the tripod structure of Fig. 26.

[0215] The support arrangement may comprise one or more couplings or nodes provided on the top member and / or legs of the erectable tripod structure for suspending the nacelle.

[0216] The support device may include one or more slings or lines for suspending the nacelle from the one or more couplings or nodes.

[0217] The support device may comprise a cantilever portion. The cantilever portion may extend from the top member or leg of the erectable tripod structure. The cantilever portion may be for suspending one or more blades of the offshore wind turbine.

[0218] The erectable tripod structure may be deployable in a first state, i.e., a folded state.

[0219] The erectable tripod structure may be deployable in a second state, i.e., an extended state.

[0220] The erectable tripod structure may be extendable, erectable, or selectively movable from a first state to a second state.

[0221] The erectable tripod structure may be foldable or may be further selectively movable from the second state to the first state.

[0222] The erectable tripod structure may be assembled and / or erected on-site or in place.

[0223] The plurality of legs of the erectable tripod structure may be connected to or connectable to the top member.

[0224] The lifting arrangement may be provided below the top member, for example directly below, during use.

[0225] Each of the plurality of legs of the erectable tripod structure may have its first end attached to the top member, for example in a hinged manner.

[0226] Each leg may be provided with a mudmat at its second end. Optionally, each mudmat may be selectively buoyant or submersible.

[0227] The above summary is merely illustrative and is intended to be non-limiting. The present disclosure includes one or more corresponding aspects, embodiments, or features, alone or in various combinations, whether specifically described (including those claimed) in that combination or alone. It should be understood that the features defined above according to any aspect of the present disclosure, or the features defined below with respect to any particular embodiment of the present disclosure, may be utilized alone or in combination with any other defined features in any other aspect or embodiment, or to form further aspects or embodiments of the present disclosure.

Brief Description of the Drawings

[0228] Here, embodiments of the present disclosure will be described by way of example only with reference to the accompanying drawings.

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Mode for Carrying Out the Invention

[0230] First, referring to FIGS. 1 to 6(e), a device / equipment 5 as a whole shown by 5 according to the first embodiment of the present disclosure is shown. The device / equipment 5 is adapted to assemble an offshore structure 10 (see FIGS. 4 and 6(e)), such as a wind turbine or an (offshore) wind turbine (generator).

[0231] In this embodiment, the device / equipment 5 is used when assembling the structure 10 which is an offshore wind turbine. However, it will be understood that the structure may be other offshore structures, such as an offshore jacket. The device / equipment 5 includes a structure 15 that can be erected (vertically) and a lifting arrangement 20.

[0232] The device / equipment 5 includes or provides an assembly area 25, for example, on the surface of an area such as water, below the lifting arrangement 20 when erected. Alternatively, the assembly area may be on a land / ground area, for example, on the surface of a quay. The assembly area 25 is provided within the perimeter, area, or volume of the device / equipment 5. The lifting arrangement 20 is provided above the assembly area 25, preferably directly above the assembly area 25.

[0233] The erectable structure 15 can be arranged in a first, or folded state (see FIG. 1). The first state facilitates the movement or transportation of the device 5. The erectable structure 15 can be arranged in a second, extended, or erected state (see FIGS. 3(a) to 6(e)). The erectable structure 15 is extensible or selectively movable from the first state to the second state. The erectable structure 15 is foldable or further selectively movable from the second state to the first state. This selective arrangement facilitates the transport of the erectable structure 15 in a folded state to the location for assembling the structure 10, i.e., the assembly area, and then its extension and erection at that location. Further, this selective arrangement may facilitate the folding of the erectable structure and / or its removal from the assembly area 25 after the structure 10 has been assembled.

[0234] In another embodiment (see FIGS. 8(a) to 13(i)), the structure can be assembled and / or erected on-site or at the site. This embodiment facilitates the individual transport of the parts of the structure to the site or at least not being assembled for on-site assembly.

[0235] The structure 15 comprises a plurality of legs 35, 36, 37 and / or a top (member) 50. The legs 35, 36, 37 are connected or connectable to the top (member) 50.

[0236] The lifting arrangement 20 is provided, in use, for example below the top (member) 50, for example directly below.

[0237] In this preferred embodiment, the device / apparatus 5 comprises a tripod 30 or a tripod arrangement. Alternatively, the device / apparatus 5 may comprise a four-legged body. The tripod 30 comprises three legs 35, 36, 37. Each of the three legs 35, 36, 37 is attached to a connecting member 45 at a first end 40, for example, in a hinged manner. The connecting member 45 comprises a top 50 of the tripod 30. The lifting arrangement 20 is attached to the connecting member 45 or the top 50 and / or hangs down therefrom (vertically downward) during use. In this way, the lifting arrangement 20 is provided between the three legs 35, 36, 37. Each leg 35, 36, 37 is provided with a mudmat 38 at a second end. Each mudmat 38 may be selectively buoyant or submersible.

[0238] The lifting arrangement 20 comprises an arrangement 55 for connecting or supporting a part of the offshore structure 10 to be lifted. The connecting arrangement 55 comprises one or more hooks, shackles, etc. Thus, the lifting arrangement 20 provides a single-point lifting arrangement that comprises a single lifting point for supporting a load, such as a component of the structure 10, etc.

[0239] The lifting arrangement 20 comprises one or more pulley arrangements 60 and / or a winch.

[0240] Referring to FIGS. 7(a) and 7(c), a device / apparatus 5a according to a second embodiment of the present disclosure is shown. The device / apparatus 5a of the second embodiment is similar to the device / apparatus 5 of the first embodiment, and similar parts are identified by the same numbers with "a" appended thereto.

[0241] In the device / apparatus 5a, one or more lines 65a, 66a, 67a (control / tethering / tagging lines) are provided between at least one, preferably each, of the legs 35a, 36a, 37a, and the lines are adapted to be connected to a load (e.g., a part of the structure) lifted by the lifting arrangement.

[0242] Referring to FIGS. 8(a) and 8(b), a device / apparatus 5 according to a first embodiment of the present disclosure is shown. In this example, the device / apparatus is used for assembling an offshore jacket 12.

[0243] In both the first and second embodiments, the legs 35, 36, 37; 35a, 36a, 37a of the device / apparatus 5; 5a have a (metal) lattice arrangement.

[0244] Next, referring to FIGS. 9(a) to 13(i), a device / apparatus 5b according to a third embodiment of the present disclosure is shown. The device / apparatus 5b of the third embodiment is similar to the device / apparatus 5 of the first embodiment, and similar parts are identified by the same numbers with "b" appended at the end.

[0245] In the device / apparatus 5b, the components of the device / apparatus are assembled on-site, that is, in the assembly area 25b.

[0246] A connecting piece 68b is provided at the intersection of lines 65a, 66b, 67b.

[0247] At or near the ends of the legs 35b, 36b, 37b distal from the top 50b, a further line or cable 145b extending circumferentially between the adjacent legs 35b, 36b, 37b is provided.

[0248] Another further line 150 may be provided at or near the ends of each leg 35b, 36b, 37b, and the further lines 35b, 36b, 37b extend (horizontally) so as to intersect at the (base) center point of the device / apparatus 5b, for example, below the top 50b.

[0249] In this embodiment, an auxiliary winch 75'b is provided.

[0250] The present disclosure provides a system for assembling an offshore structure (such as an offshore structure, a wind turbine, or a jacket, like a wind turbine or a jacket), the system comprising devices / apparatuses 5, 5a, 5b.

[0251] The system comprises a floating or buoyant body 70 for transporting one or more parts of the offshore structure to an assembly area 25.

[0252] The system comprises one or more winches 75, for example, for controlling a lifting arrangement.

[0253] One or more winches 75 can be provided on a further floating or buoyant body 80. The further floating or buoyant body 80 is adapted to be fastened to the legs 35 of the device / apparatus 5. For example, the further floating or buoyant body 80 comprises a slot or recess 85 for engaging with the legs 35 of the device / apparatus 5. The slot 85 can also receive a connecting member during transportation of the device / apparatus when in a folded state.

[0254] The present disclosure provides a method of deploying devices / apparatuses 5, 5a, 5b for assembling an (offshore) structure 10 such as a (floating / buoyant) offshore structure, a wind turbine, or a jacket, like a wind turbine. The method comprises providing the devices / apparatuses 5, 5a, 5b in or to an assembly area 25 or location, and deploying / erecting the devices / apparatuses 5, 5a and including.

[0255] In the disclosed embodiments, the assembly area 25, 25a, 25b or location is an area of water. Also, in the disclosed embodiments, the devices / apparatuses 5, 5a, 5b stand / are installed on the seabed 90 of a water mass 86, for example, the seabed, when erected. Also, the top 50 and the lifting arrangement 20 are provided above the surface level 95 of the water mass 86.

[0256] The step of providing the devices 5, 5a, 5b to the assembly areas 25, 25a, 25b includes the use of one or more vessels or barges 100.

[0257] The present disclosure provides a method of assembling an offshore structure 10, a structure such as a wind turbine or a jacket, or a wind turbine. The method includes deploying the devices 5, 5a, 5b according to the method described above, and transporting a first portion 105 of the offshore structure 10 to the assembly area, and lifting the first portion 105 using the lifting arrangement 20, and transporting a floating / floating base or foundation body 110 to the assembly area 25, and connecting / clamping the first portion 105 of the structure 10 to the floating / floating base body. including.

[0258] The method includes the following subsequent steps, namely, transporting further components of the structure 10 to the assembly area 25, and lifting the further components using the lifting arrangement 20, and transporting the floating / floating base body to the assembly area 25, and lowering and / or connecting further portions of the structure onto the first / one portion of the structure already provided on the floating / floating base body 110. may include.

[0259] The structure 10 (including the floating base body 110) is a floating structure.

[0260] The structure 10 includes the following, namely, a plurality of parts or components, and a segmented (offshore) structure, and a floating / floating foundation, and a monopile, and A wind turbine (see FIGS. 4 and 6(a) to 6(e) or FIGS. 7(a) to 7(c)) and a jacket (see FIGS. 8(a) and 8(b)), for example, a tripod jacket, a four-leg jacket or a torsion jacket and comprises or includes.

[0261] In the case of a structure 10 comprising a wind turbine, the parts are the following, namely, a column or tower, for example first and second column parts 115, 120 (for example, each about 400 - 500 tons) and a nacelle 125 (for example, about 60 tons) and a plurality of turbine blades, for example three turbine blades 130, 131, 132 (for example, each about 60 tons) and comprises one or more of.

[0262] In such a case, a given number of parts (6) are present, and thus there are requirements for the same given number of lifts (6).

[0263] In the embodiments shown in FIGS. 9(a) to 13(i), the method includes using a tower 140, a post or a column to support the structure (or part thereof) during assembly.

[0264] An arrangement is provided for extending or increasing the height of the tower 140, the post or the column during use, for example at intervals, so as to lift the structure 10b and / or the top 50b of the structure 10b, for example the tower may be telescopic.

[0265] Typically, the blades 130, 131, 122 are lifted horizontally.

[0266] According to the present disclosure, a method for assembling an (offshore) structure 10 such as an (offshore) wind turbine or an (offshore) jacket is provided. The method comprises the following steps, namely, To provide a lifting arrangement 20, the lifting arrangement comprising a gantry disposed above and / or directly above the water area, and lifting means or apparatus coupled to the gantry, and the providing; To stack parts of the structure 10, To disposably arrange a first part of the structure 10 relative to or in the water area so as to be transportable, To lift the first part using lifting means, To configure a clamping device or holding device 135 to grip the first part, To transport the clamping device or holding device away from the water area, To lift a second part of the structure 10 using the lifting means or apparatus, To dispose the first part under or adjacent to the second part by further transporting the first part, gripped by the clamping device 135, to the water area, To stack by lowering the second part onto or to connect with the first part, and including.

[0267] The step of lifting the second part using the lifting means or apparatus includes winding up and / or raising the second part to a height above the uppermost level of the first part.

[0268] The method includes fixedly coupling the second part to the first part by bolting, welding, and / or clamping.

[0269] The structure 10 may be, for example, a wind turbine assembly such as an offshore wind turbine for supporting a wind turbine, or a jacket such as an offshore jacket.

[0270] The first part and / or the second part and / or one or more further parts may be at least one of a part of a tower or a nacelle or a turbine blade.

[0271] The method may further include placing one / further part on the second part, lifting the further part using lifting means, placing the second part of the structure under the further part by transporting the second part to an area of water, lowering the further part onto the second part and stacking steps.

[0272] The clamping device may be provided on a floating or buoyant body, such as a buoyant foundation or (top) crown assembly.

[0273] The clamp 135 or clamping device is configured to support and / or clamp and / or grip at least a part of the structure 10 in a vertical arrangement and / or a substantially upright configuration.

[0274] The present disclosure provides a system for assembling a structure 10 such as an (offshore) wind turbine or an (offshore) jacket. This system includes a gantry disposed above and / or directly above an area of water, lifting means coupled to the gantry, and means for transporting a part of the structure 10 between the area of water. The means for transporting a part of the structure includes a clamping device or holding device 135.

[0275] The clamping device or holding device 135 is configurable between a clamping or holding configuration for gripping a part of the structure 10 and a non-clamping or non-holding configuration.

[0276] The clamping device 135 is coupled or mounted to a floating or buoyant base body 110, such as a buoyant foundation or (top) crown assembly or a barge.

[0277] The lifting means comprises a winch 75 and / or a pulley or pulley arrangement 60.

[0278] The system is adapted to assemble an offshore wind turbine assembly or a wind turbine assembly or jacket, such as an offshore jacket assembly for a wind turbine.

[0279] The system comprises a clamp and / or gripping system, the clamp and / or gripping system comprising a clamp device 135 for gripping at least a part of the wind turbine assembly, and a floating or buoyant base body 110, and is provided with, the clamp device being mounted on the floating or buoyant base body 110.

[0280] The clamp device 135 is configured to support at least a part of the wind turbine assembly or jacket assembly in a vertical arrangement and / or in a substantially upright configuration.

[0281] The clamp device 135 is configured to engage a flange or rim disposed on an outer surface of a part of the structure 10.

[0282] Referring now to FIG. 14, a device / apparatus 5c according to a fourth embodiment of the present disclosure is shown. The device / apparatus 5c of the fourth embodiment is similar to the device / apparatus 5 of the first embodiment, and similar parts are identified by the same numbers with "b" appended thereto.

[0283] In the device 5c of the fourth embodiment, a support member 38 is provided on each of the legs 35c, 36c, 37c. The three support members 38 are provided at or near the respective ends of the legs 35c, 36c, 37c distal from the top 50c. Each support member 38 is deployed in a substantially vertical arrangement during use. The support members provide support / strength to the respective legs 35c, 36c, 37c so as to avoid buckling of the legs 35c, 36c, 37c.

[0284] Regarding the various embodiments of the present disclosure, the reader will note the following. 1. The system creates a single point at a height sufficient to lift the nacelle 125 to the top of the column of the floating wind turbine. This is expected to be at an altitude of about 220 m. 2. The single point lift may have multiple hooks of different capacities, for example 1000 tons and 120 tons. These are, in some cases, suspended from the same location below the lift point in a triple plate arrangement. 3. The system is planned to be supported (moored) to the seabed. 4. The system is planned such that the floating turbine support structure is in water at a depth sufficient for it to be placed in a floating state at the turbine location directly below the hook. 5. The structure supporting the hook may be self - standing. 6. Components can be placed under the hook using a floating transport means - a barge or a ship. 7. Marine transportation is planned such that it can be moved under the hook without cutting the mooring bodies and then moored so that it can leave for a storage location. The position is moved by a winch that adjusts the length of the mooring line. 8. The floating structure is similarly moored and moved under the hook for installing the wind turbine components. 9. The wind turbine components are lifted higher than their locations on the floating structure, and when the structure is placed under the hook, the components are lowered into place on the floating structure. 10. The support structure may be realized by one of the following methods: a. A tripod structure having pads that support it on the seabed. b. Two pile towers (similar to wind turbine towers) having beams at the top cross between the towers with hooks suspended from the beams. The towers may be angled so that the spacing at the base is greater than at the top as the floating structure is wider at the base than at the top. This reduces the size of the top beam. The support piles may also be angled so that the bending moment (axial compressive force) in the towers is limited. c. The tower may be a lattice structure. d. The tower may be disassemblable for ease of transportation. 11. The system is also used for installing the blades. This is one of the reasons for the smaller hooks. 12. The winch for the hook is at the base of the tower above the waterline. The power for the winch may be on the tower or from another vessel or power source. 13. The winch is most likely to be multifall. It may be two winches with a common wire that allows adjustment of the working point of the wire to extend its life. The winches may be on separate legs. 14. The hook may have some local later movement. 15. The hook has a swivel part that can be powered. 16. There are various access platforms that allow access to the various components as required for assembly work. These may be stowable platforms that extend from their base points on the tower, swivel, and can change height. 17. The tower may float when at sea and the tower may have fixed tanks. 18. There is a personnel transportation system (lift) and an equipment transportation system on at least one inner or outer side of the legs.

[0285] Regarding an embodiment where the structure 10 is a jacket for a wind turbine, for example, the reader will note the following.

[0286] Support jackets for offshore wind turbines may be made in halves (upper and lower) and joined together before going offshore. A single point lift can be used for that purpose. In such cases, the reader will note the following. 1. The jacket is attached (moored) to the seabed. 2. The jacket can come to the assembly site in halves on a barge / ship. 3. The floating transporter is placed below the lifting point and attached to the upper part of the jacket. 4. The upper part of the jacket is lifted higher than the lower part of the jacket and suspended. 5. Move the floating transporter to place the lower part of the jacket under the upper part. 6. Lower the upper part to land on the lower part of the jacket. 7. Complete the permanent connection between the upper and lower parts.

[0287] This can be particularly beneficial in locations with a number of bridges at the entrance to a port, etc.

[0288] In addition to the foregoing attributes, notable features of the present disclosure are as follows. · Single point lift, optionally with minor movement (500 mm). · Can be from the following: · A gantry (fixed to the seabed), which may be tapered towards the top. · A tripod with three legs or a quadripod with four legs, equal leg sizes and thus equal angles, or having legs / angles of different sizes. · Since the lifting point is static, the construction of the wind turbine tower (onto the floating foundation) or the jacket (onto the barge or the like) is through inserting the "floating body" or the barge and the tower / jacket components under a single-point lift. This is often via a winch or a ship (tag), and a winch is preferred to keep the ship away from the lifting structure. · The erection of the tripod / tetrahedron may, in some cases, be by tightening the connections between the legs and pushing / pulling the central gusset plate from below / above. · The tripod / tetrahedron is assembled at the quay or at the dock and may be towed to the site or towed to the site and partially assembled. · The tripod / tetrahedron may have buoyancy adapted to (or as part of) the structure to assist in erection, for example, it may be partially assembled underwater. · The tripod / tetrahedron may be movable and transportable. · The device / apparatus can be used for construction and / or subsequent maintenance. · The device / apparatus can be used on land (the inventors expect that the greatest benefits will be obtained from offshore use in areas with sufficient water depth, a sufficiently deep access channel, reasonably protected, near the labor force, and near the alignment and support port facilities).

[0289] It should be understood that the embodiments of the present disclosure described above are given by way of example only and are in no way meant to limit its scope.

[0290] In the preferred embodiments of the present disclosure, it should be understood that the structure is a floating / floating structure and / or is provided on a floating / floating (base) body or foundation.

[0291] It is understood that the device / apparatus of the embodiments of the present disclosure involves unmanned lifting of the components of the structure and landing of the components of the structure without human intervention within the assembly area. During use, it is not necessary to place personnel under the lifting arrangement and is allowed.

[0292] FIG. 15a depicts a perspective view of a traveling gear module according to an embodiment of the present disclosure. FIG. 15b depicts a diagram of the traveling gear module of FIG. 15a. The layout actually has two top assemblies, and the top holds three legs together and supports a traveling gear module that can travel up and down a structure such as a post or column, such as tower 140. In one example, the weight of the traveling gear may be in the region of 250 t, but the load that it can generate may be the full capacity of a multi-fall hook. In an exemplary embodiment, a lifting force of 1000 t, 1500 t, or more may be provided.

[0293] The top assembly 105 is shown. The top assembly 105 may be a central part.

[0294] Three legs 110a, 110b, 110c of the erectable structure are also shown.

[0295] The top assembly 105 holds the three legs 110a, 110b, 110c together and supports a traveling gear module 115 that can travel up and down the structure, for example, up and down a post or column such as tower 140.

[0296] A first plurality of pins and U-link arrangements 120 are shown. The pin and U-link arrangement 120 couples the top assembly 105 to the three legs 110a, 110b, 110c.

[0297] A hoist 125 for lifting the traveling gear module 115 is also shown. In a non-limiting example, the hoist may have a capacity of 300 t.

[0298] As shown in the illustration, when in a fully fixed position, the second plurality of pins and the U-shaped link arrangement 130 may fix the traveling gear module 115 to a structure, such as three legs 110a, 110b, 110c, thereby providing a mechanical connection.

[0299] Referring generally to the above-described embodiments, particularly the exemplary embodiments of FIGS. 15a and 15b, 1. The erection of a tripod (or multi-legged structure) may be assisted by a post mounted on a floating structure passing through the central portion of the "tripod". Then, the central components of the structure may "walk" up the post, for example, using a walking clamp or a clamp, while simultaneously pulling a tension member between the center and the base of the legs or between the bases of the legs. The post may initially be such that the upper part of the multi-legged structure is on a floating structure arranged around the post (the post may then be installed on components joined to each other on the deck or may be lowered onto the top of the post). The floating structure may be lowered to the seabed to provide a reaction force to lift the multi-legged structure to a predetermined position and may remain floating if it has sufficient buoyancy and stability capacity to act on the load. Alternatively, a linear winch may be installed at the top to lift the top of the multi-legged structure, or a return sheave with a winch may be provided on the deck. The post may have another post inside such that the internal post can be extended so that the lifting process continues when the top of the multi-legged structure reaches the top of the post. 2. The multi-legged structure may be erected without any lifting machinery in place. It may then be lifted into place after the structure has been erected. 3. The erectable structure may have some of its main structural components that have been lifted into place following the initial erection of the structure. These structural components may also form part of a platform for the lifting machinery. 4. The lifting machinery may be lowered and removed for any reason, including but not limited to maintenance, repair, overhaul, and storage. 5. The wind damage to the structure may be reduced by removing a part of the structure, particularly the upper structure, such as a roof or a safety area for personnel who may be required only during operation. 6. The part of the structure that is lifted after the initial erection may be used to make the structure more rigid in order to reduce the buckling load. 7. In the case of a tripod, it is assumed that there may be mudmats at the base of each leg. These mudmats can be adapted to the buoyancy that may extend from their decks, and when on the seabed, their uppermost parts are above the waterline. 8. This can help to sink the mudmat in place.

[0300] The mudmat can be ballasted to provide lateral stability (from wind and tidal forces etc.) during operation. This may be achieved by one of the following. a. Pumping in water or other high-density materials for providing gravity anchors (e.g., mud or hematite) b. Sheet piles around the mudmat c. Pile anchors d. Suction anchors e. Dry anchors attached by chains, wires or ropes f. Fixing a line to the shore.

[0301] Referring now to Figure 16, an apparatus generally indicated at 1005 is depicted. The apparatus 1005 is adapted to assemble an offshore structure 1010 (see Figure 24), such as an offshore wind turbine or an (offshore) wind turbine (generator).

[0302] In this embodiment, the device 1005 is used when assembling the structure 1010, which is an offshore wind turbine. However, it will be understood that the structure may be other offshore structures, such as an offshore jacket. The device 1005 includes first and second (vertically or substantially vertically) erectable structures 1015, 1016, an elongate structure 1017, and a lifting arrangement 1020 (see FIGS. 17a - 18b).

[0303] When erected, the device / equipment 1005 defines an assembly area below the lifting arrangement 1020, for example, above an area of water, such as the seabed or floor of a body of water, such as the seabed. Alternatively, the assembly area may be located on a land / ground area, such as on the surface of a quay. The assembly area may be provided, for example, below, such as directly below, the lifting arrangement 1020 when erected.

[0304] The assembly area is provided within the perimeter, area or volume of the device 1005. The lifting arrangement 1020 is provided above the assembly area, preferably directly above the assembly area.

[0305] The first and second erectable structures 1015, 1016 can be arranged in a first state, i.e., a folded state. For example, FIG. 1 shows a structure corresponding to the first erectable structure 1015 in the folded state. The first state facilitates the movement or transportation of the device 1005. The first and second erectable structures 1015, 1016 can be arranged in a second, extended, or erected state (see FIGS. 16 to 18(b)). The erectable structure 1015 can be extended or selectively moved from the first state to the second state. The first and second erectable structures 1015, 1016 are foldable or can be further selectively moved from the second state to the first state. This selective arrangement facilitates the transportation of the first and second erectable structures 1015, 1016 in the folded state to a location for assembling the structure 1010, i.e., an assembly site, and then extending and erecting them at that location. Further, this selective arrangement can facilitate the folding of the first and second erectable structures 1015, 1016 and / or their removal from the assembly site after the structure 1010 has been assembled.

[0306] The first and second erectable structures 1015, 1016 may be similar to the erectable structure 15 of the first embodiment of the present disclosure. The first structure 1015 includes a first plurality of legs 1035, 1036, 1037 and / or a first connection arrangement 1050. The legs 1035, 1036, 1037 are connected to or connectable to the first connection arrangement 1050. The second structure 1016 includes a second plurality of legs 1033, 1034 and / or a second connection arrangement 1051. The legs 1033, 1034 are connected to or connectable to the second connection arrangement 1051.

[0307] The first and / or second connection arrangements 1050, 1051 may include a top member such as the top (member) 50 of the first embodiment of the present disclosure. The top (member) of the first and second connection arrangements 1050, 1051 may respectively define first and second tops 1052, 1053 of the first and second pluralities of legs.

[0308] The elongated structure 1017 extends between the first and second erectable structures 1015, 1016. The elongated structure 1017 is preferably connected to or connectable to the first and second erectable structures 1015, 1016 by first and second connection arrangements 1050, 1051 respectively, and more preferably extends directly below the first and second connection arrangements 1050, 1051.

[0309] In this embodiment, the first erectable structure 1015 includes a tripod 1030 or a tripod arrangement, and the second erectable structure 1016 includes a pair of shear legs 1031. Alternatively, the first erectable structure 1015 may include a four - legged structure, and / or the second erectable structure 1016 may include an A - frame, a tripod or a four - legged structure. An exemplary tripod 1030 includes three legs 1035, 1036, 1037. Each of the three legs 1035, 1036, 1037 is attached to the first connection arrangement 1050 at a first end 1040, for example, in a hinged manner. An exemplary shear leg 1031 includes two legs 1033, 1034. Each of the two legs 1033, 1034 is attached to the second connection arrangement 1051 at a first end 1041, for example, in a hinged or fixed manner.

[0310] A mudmat 1038 is provided at the second end of each of the legs 1033, 1034, 1035, 1036, 1037. Alternatively, as shown in this exemplary embodiment, one or more legs, such as 1034 and 1036, may share a mudmat 1038. Each mudmat 1038 may optionally be buoyant or submersible. Each of the legs 1033, 1034, 1035, 1036, 1037 may be hingedly coupled to its respective (or shared) mudmat 1038 such that it is configured or configurable to pivot at the second end with respect to its respective (or shared) mudmat 1038. In this embodiment, the legs 1033, 1034, 1035, 1036, 1037 of the device 1005 comprise a (metal) lattice arrangement.

[0311] In this embodiment, the legs 1033, 1034, 1035, 1036, 1037 have a fixed length. Alternatively, one or more of the legs 1033, 1034, 1035, 1036, 1037 may be configured to be extendable and / or may be configured to be extended by inserting an extension portion into each leg.

[0312] In this exemplary embodiment, the elongated structure 1017 includes a beam provided with a cantilever portion extending from the second erectable structure 1016 in a direction away from the first erectable structure 1015. Alternatively, the elongated structure 1017 may include a truss and / or the cantilever portion may include a tapered portion (see the elongated structure 1017a in FIGS. 17a / b).

[0313] Next, referring to FIGS. 17a to 18b, an apparatus 1005 according to a ninth embodiment of the present disclosure is shown. In this example, the lifting arrangement 1020 is used to lift the assembled column parts 1115, 1120 of the structure 1010.

[0314] The lifting arrangement 1020 is configured / configurable to move a load (e.g., the assembled column parts 1115, 1120) along the elongated structure between the first and second erectable structures 1015, 1016. The lifting arrangement 1020 includes an arrangement 1055 for connecting or supporting the portion of the offshore structure 1010 to be lifted. The connection arrangement 1055 includes one or more hooks, shackles, etc. Thus, the lifting arrangement 1020 provides a single-point lifting arrangement (e.g., having a single lifting point for supporting the load of the parts / components of the structure 1010, such as the assembled column parts 1115, 1120, etc.).

[0315] The lifting arrangement 1020 includes one or more pulley arrangements 1060 and / or a winch.

[0316] Next, referring to FIGS. 17a to 24, there is provided a system according to a tenth aspect of the present disclosure for assembling a structure such as a wind turbine or a jacket, comprising an apparatus 1005 according to a ninth aspect.

[0317] The system comprises a first body 1070 for transporting one or more parts of the structure 1010, such as assembled column parts 1115, 1120, to an assembly area provided below at least a part of the lifting arrangement 1020.

[0318] In this exemplary embodiment, the first body 1070 is a floating or buoyant body, such as one or more pontoons, a ship, etc. The first body 1070 may be stabilized against the seabed or floor of the water mass below the lifting arrangement 1020 using a first stabilizing arrangement, such as jacks, mooring or anchor arrangements (not shown) that limit the movement of the first body 1070 relative to the seabed or floor.

[0319] The system further comprises a second body 1071 for transporting one or more parts of the structure 1010, such as a floating / buoyant base or foundation body 1110, to an assembly area provided below at least a part of the lifting arrangement 1020 and / or for assembling the structure 1010.

[0320] FIGS. 19a to 20c show an exemplary embodiment of the second body 1071 according to the system of this embodiment. In this exemplary embodiment, the second body 1071 is a selectively submersible body comprising a plurality of submersible pontoons, ships, etc. 1100 coupled together with a plurality of heavy capacity beams 1101. The second body may comprise a superstructure 1102 for supporting and / or attaching one or more parts of the structure 1010 during transport of parts to the assembly area and / or during construction of the structure 1010. The superstructure 1102 is preferably configurable such that the superstructure 1102 is above the waterline when the second body 1071 is submerged in water (see FIGS. 20a to 20b).

[0321] Alternatively, the second body 1071 may be a floating body or a buoyant body. The second body 1071 may be stabilized with respect to the bottom or floor of the body of water below the lifting arrangement 1020 using a second stabilization arrangement.

[0322] Exemplary embodiments of the second body 1071 are shown in FIGS. 21a-22b, on which the floating / buoyant base or foundation body 1110 of the structure 1010 is placed, coupled, and / or attached. In use, the second body 1071 is selectively submerged so that the floating base 1110 can be positioned above the second body 1071 that is submerged. The base 1110 is then attached to and / or coupled to the second body using a plurality of heavy capacity beams 1101 and / or upper structures 1102 so that the base 1110 is firmly coupled to the second body.

[0323] The second body 1071 may then be selectively lifted (see FIGS. 22a and 22b), thereby lifting the base 1110 above the water level and enabling it to be transported to an assembly area.

[0324] Referring now to FIGS. 23a-23d, a system according to a tenth embodiment of the present disclosure is shown. In this example, the system is used to lift the assembled column portions 1115, 1120 onto the floating base 1110 of the structure 1010 placed on the second body 1071.

[0325] As described above with reference to FIGS. 21a-22b, the floating base 1110 is placed on the second body 1071 and transported to an assembly area. The second body 1071 is positioned below the elongated structure 1017a (see FIG. 23a). The second body 1071 may then be selectively submerged so as to be disposed on the seabed to stabilize the second body 1071 (see FIG. 23b).

[0326] The lifting arrangement 1020 is used to lift the assembled column parts 1115, 1120 from the first body 1070 (see FIG. 23c) onto the floating base 1110 (see FIG. 23d) firmly coupled to the stabilized second body 1071. Next, the assembled column parts 1115, 1120 are coupled to the floating base 1110. Then, this process can be repeated for additional parts of the structure 1010 (e.g., nacelle 1125).

[0327] Once additional parts of the structure 1010 are assembled, the second body 1071 may be selectively buoyed. In this example, while the second body 1071 is floating, and for example while being moored, anchor - coupled, etc., the second body 1071 may be positioned under the cantilevered portion of the elongated structure 1017a so that a plurality of blades 1130, 1131, 1132 can be coupled onto the structure 1010. Alternatively, the second body 1071 may be selectively submerged under the cantilevered portion of the elongated structure 1017a so as to be stabilized on or against the seabed.

[0328] The present disclosure provides a method of deploying an apparatus 1005 for assembling an (offshore / floating) offshore structure 1010 such as a wind turbine, an (offshore) structure such as a wind turbine or a jacket. The method may include providing the apparatus 1005 to or in an assembly area or location, and deploying / erecting the apparatus 1005.

[0329] The step of providing the apparatus 1005 to the assembly area may include the use of one or more vessels or barges 1100.

[0330] Deploying / erecting the apparatus 1005 may include erecting a first erectable structure 1015 such that when erected, it stands / sits on top of the seabed of a body of water. An exemplary method of erecting the first erectable structure 1015 has been described above with reference to FIGS. 1 - 3b of the present disclosure.

[0331] Deploying / erecting the device 1005 includes erecting the second erectable structure 1016 such that when erected, it stands / sits on the bottom of the water mass.

[0332] Erecting the second erectable structure 1016 may include coupling each end of the second plurality of legs 1033, 1034 to respective support structures such as the mat 1038 by means of a hinged arrangement. Each of the second plurality of legs 1033, 1034 may be arranged to extend in a first direction in a first state, i.e., a folded or stowed state.

[0333] Deploying / erecting the device may include transitioning the second erectable structure 1016 from a first, or folded, or stowed state to a second, or extended, state by rotating each of the second plurality of legs 1033, 1034 about a hinged arrangement such that each of the second plurality of legs 1033, 1034 is arranged to extend in a second direction, which is more upright than the first direction.

[0334] Deploying / erecting the device includes using a last lifting device, such as a lifting device coupled to the first erectable structure 1015 and / or the second erectable structure 1016, to lift the elongate structure 1017 / 1017a.

[0335] Deploying / erecting the device 1005 includes coupling the elongate structure 1016 to the first and second erectable structures 1015, 1016.

[0336] It will be understood that the steps of this embodiment may be performed in a temporal order different from the order of explanation. For example, the second erectable structure 1016 may be erected before or after the first erectable structure 1015.

[0337] The present disclosure provides a method of assembling a structure such as an offshore structure 1010, a wind turbine or a jacket, or a wind turbine. The method includes deploying an apparatus 1005 according to the foregoing method, disposing a first base or body 1070 in an assembly area substantially below at least a part of a first erectable structure 1015, disposing a second base or body 1071 in an assembly area substantially below at least a part of a second erectable structure 1016, and assembling the structure 1010 by configuring a lifting arrangement 1020 to lift components of the structure 1010 from the first base or body 1070 towards the second base or body 1071.

[0338] The first base or body 1070 may comprise a floating / floating barge or ship for carrying components.

[0339] Disposing the first base or body 1070 in the assembly area may optionally include stabilizing the first base or body 1070 against the seabed or floor of the water mass below the lifting arrangement 1020.

[0340] Stabilizing the first base or body 1070 may include configuring a first stabilizing arrangement 1072, such as a jack, to limit movement of the first base or body 1070 relative to the seabed or floor. Alternatively, stabilizing the first base or body 1070 may include mooring the first base or body, or attaching the first base or body to a mat 1038 associated with the first base or body 1070.

[0341] The second base or body 1071 may comprise a floating / floating ship, such as a floater 1110 for a wind turbine, for supporting the assembled structure 1010.

[0342] Disposing the second base or body 1071 in the assembly area may optionally include stabilizing the second base or body against the bottom or floor of the water mass below the lifting arrangement 1020.

[0343] Stabilizing the second base or body 1071 may include disposing the second base or body 1071 on a grounded vessel. Alternatively, stabilizing the second base or body 1071 may include disposing the second base or body 1071 on a floating vessel, disposing the second base or body 1071 on the seabed, or mooring the second base or body 1071.

[0344] It will be understood that the steps of this embodiment may be performed in a chronological order different from the order of description. For example, the second base or body 1071 may be disposed in the assembly area before or after the first base or body 1070.

[0345] In some embodiments, the first and / or second stabilizing arrangements may comprise at least one panel or member. The at least one panel or member may comprise an inflatable element. The at least one panel or member, such as the inflatable element, may comprise at least one layer of drop stitch material.

[0346] For example, a panel or stack of panels of drop stitch material may provide temporary buoyancy under the first or second body instead of (or in addition to in some exemplary embodiments) using a raft or vessel.

[0347] Advantageously, the use of drop stitch material can provide means having a controllable amount of air and thus means for generating a stabilizing buoyancy.

[0348] In one example, an inflatable bag whose volume and / or pressure of the inflated portion can be controlled is disposed under the second base or body, for example, under the hull of the floater 1110, and then inflated, thereby reducing the draft of the body, for example, the floater 1110. Next, the body can be lowered to the seabed using variable buoyancy, for example, in the same manner as a submersible raft.

[0349] That is, in an exemplary embodiment, the floater 1110 may be disposed on one or more inflatable elements, such as an inflatable element including a drop stitch material.

[0350] Optionally, stabilizing the second base or body may include controlling the volume or air within one or more inflatable elements disposed below and / or around at least a portion of the second base or body. For example, one or more inflatable elements, such as an inflatable element including a drop stitch material, may be installed under the hull of the floater 1110, for example, under each tag or spar of the floater 1110. In some examples, such inflatable elements may extend under and / or around at least a portion of the base or body, for example, under and / or around the legs or spars of the floater 1110.

[0351] In some examples, the inflatable element may be provided as a modular inflatable element. In some examples, the inflatable element may be provided as an assembly or stack of inflatable elements (e.g., sub-elements). In some examples, the / each inflatable element may be for a housing or substantially cup-shaped or receiving portion for receiving, and / or holding, and / or at least partially surrounding a leg or portion of the second body or base.

[0352] Next, a method of assembling an offshore wind turbine, such as an offshore floating wind turbine according to an embodiment of the present disclosure, will be described with reference to FIGS. 25 to 36.

[0353] FIG. 25 depicts a ship 1200 that may be referred to in the industry as a cargo feeder barge. The ship 1200 is depicted as carrying components of an offshore wind turbine for use in a method of assembling an offshore wind turbine.

[0354] By way of example, the components include a first tower section 1205, a second tower section 1210, a third tower section 1215, and a fourth tower section 1220. The first through fourth tower sections 1205-1220 can be assembled into a tower as will be described in detail below. It will be understood that in other embodiments, less than three or more tower portions can be assembled to provide a tower.

[0355] For purposes of illustration only, exemplary dimensions are set forth. For example, the first tower section 1205 has a diameter of about 7.5 meters, a length of 22 meters, and a weight of 300 tons, the second tower section 1210 has a diameter of about 7.5 meters, a length of 26 meters, and a weight of 200 tons, the third tower section 1215 has a diameter of about 7.5 meters, a length of 40 meters, and a weight of 260 tons, and the fourth tower section 1220 has a diameter of about 6.5 meters, a length of 35 meters, and a weight of 180 tons. Also depicted is a nacelle 1225 having dimensions of about 27.5×12×11 meters and a weight of 610 tons. Also depicted is a blade 1230 having a root diameter of about 5 m, a length of 115.5 m, and a weight of 63.5 tons.

[0356] In some examples, the blade 1230 may be provided to an assembly area using a further ship 1230, such as a feeder barge commonly known in the industry as a “blade feeder barge”.

[0357] The ship 1200 is depicted as including a sea surface fixed lattice framework 1235 for supporting the plurality of tower portions 1205-1220. The lattice framework 1235 can be raised to allow personnel access to the interior of each tower portion 1205-1220.

[0358] Figure 26 depicts a support device 1240. In an exemplary embodiment, the support device 1240 includes a tripod structure that can be set up vertically.

[0359] The support device 1240 includes a first leg 1245a, a second leg 1245b, and a third leg 1245c. The multiple legs 1245a - c of the support device 1240, e.g., a tripod structure that can be set up vertically, may be connected to or connectable to a connection member hereinafter referred to as the top member 1250.

[0360] As described above, the support device 1250 can be composed of a device or apparatus for assembling the structure of the first aspect or the seventh aspect, or a device for assembling the structure of the ninth aspect, or can substantially correspond to these. The support device may include, for example, the tripod structure depicted in Fig. 3a or the tripod structure in Fig. 26.

[0361] As described above, the support device 1240, e.g., a vertically - set - up tripod structure, may be arranged in a first state, i.e., a folded state, and may be arranged in a second state, i.e., an extended state, as depicted in Fig. 26. Each of the multiple legs 1245a - c can be attached to the top member 1250, e.g., in a hinged manner, at its first end. In the example, a mud mat is provided at the second end of each leg 1245a - c. Optionally, each mud mat may be selectively buoyant or submersible.

[0362] An assembly area 1255 is depicted, and the assembly area 1255 is provided below the support device 1240.

[0363] As depicted in FIG. 27, in the step of assembling an offshore wind turbine, the ship 1200 is transported to the assembly area 1255. In an example of a tower including four tower parts, the second tower part 1210 may be rigged to the support device 1240 such that it is the first component of the tower lifted by the lifting arrangement 1260 of the support device 1240. This can be seen in FIG. 28, where first the second tower part 1210 is stacked on the first tower part 1205, the third tower part 1215, and then the fourth tower part 1220 are stacked, and the assembled tower 1265 is provided.

[0364] FIGS. 29 and 30 depict the step of hoisting the nacelle 1225 and the step of lowering the nacelle 1225 from the support device 1240.

[0365] In an example, a plurality of lines or slings 1270 may be used to suspend the nacelle 1225 in a holding position. In an example, the holding position may be offset from a vertical axis extending through the top of the support device 1240. That is, in an example, the nacelle 1225 may be effectively stored on the support device 1240 (e.g., below or substantially below or adjacent to the top member 1250 of the support device 1240) until it is required to land on the tower 1265 later.

[0366] In the example, the support device 1240 includes support assemblies 1295a - b that support the nacelle 1225. In the example, the support assemblies 1295a - b include a plurality of couplings or nodes 1295a, 1295b. The couplings or nodes 1295a, 1295b are provided on the top member 1250, although it will be understood that such couplings or nodes 1295a, 1295b may additionally or alternatively be provided on at least one of the legs 123a - c of the support structure 1240. Such couplings or nodes 1295a, 1295b may comprise, for example, any of a padeye, shackle, fastener, clip, etc. A plurality of lines or slings 1270 may be coupled to the couplings or nodes 1295a, 1295b.

[0367] In the next step depicted in FIG. 31, the vessel 1200 is maneuvered so that the tower 1265 is positioned below the lifting assembly 1260, for example, directly below.

[0368] In the next step depicted in FIG. 32, the assembled tower 1265 is lifted by the lifting assembly 1260. As a result, both the assembled tower 1265 and the nacelle 225 are suspended from the support device 1240, and the vessel 1240 has only performed a single substantial offshore operation.

[0369] In the next step also depicted in FIG. 32, the vessel 1200 is maneuvered away from a position directly below the lifting device 1260, for example, to a position outside of the assembly area 1255.

[0370] As also depicted in FIGS. 32 and 33, in the example, a floating / floating base or foundation body, which is a floater 1275, is maneuvered below the lifting assembly 1260, for example, directly below.

[0371] In the example, the floating / floating base or foundation body may comprise a floater 1275, a floating spar, a tension leg platform, a barge, or a semi - submersible offshore drilling platform.

[0372] Furthermore, in some embodiments, the method may include stabilizing, in the assembly area 1255, a floating / floating base or foundation body, such as a floater 1275, against the bottom or floor of the water mass using a stabilizing arrangement (not depicted) comprising at least one of a jack, a mooring arrangement, an anchor arrangement, and / or a grounded vessel. An example of such a process for stabilizing the floater 1270 was described above with reference to the examples of FIGS. 19a-22b, which may be applicable to this embodiment.

[0373] Advantageously, stabilizing the floater 1275 against the bottom or floor of the water mass enables a static-static lift operation when landing the nacelle 1225 on the assembled tower 1265, thereby minimizing the risk of damage to the tower 1265 and / or the nacelle 1225 and simplifying the assembly operation.

[0374] As also depicted in FIG. 33, the assembled tower 1265 may then be landed on the floater 1270.

[0375] Next, as depicted in FIG. 34, the nacelle 1225 is landed on the assembled tower 1265. In a non-limiting example, landing the nacelle 1225 on the tower 1265 may include the step of carrying the nacelle 1225 horizontally from a holding position to a landing position substantially below the top of the support device 1240, such as the top member 1250.

[0376] FIG. 35 depicts a further vessel 1280, which in this example is a blade feeder version. The further vessel 1280 carries blades 1230a-c for attachment to the nacelle 1225. The further vessel 1280 is maneuvered to run substantially parallel to the floater 1275.

[0377] Also depicted is a cantilever portion 1285 extending from the support device 1240. In the example, the cantilever portion 1285 extends from the top member 1250 of the support device 1240. In other embodiments falling within the scope of the present disclosure, it will be understood that the cantilever portion 1285 may extend, for example, additionally or alternatively, from the legs 1245a-c of the support device 1240. In an exemplary embodiment, the cantilever portion 1285 may be removable from the support device 1240. In an exemplary embodiment, the cantilever portion 1285 may be configured to selectively extend from the support device 1240, for example, from the legs 1245a-c and / or the top member 1250 of the support device 1240. For example, the cantilever portion 1285 may be hingedly connected to the support fixture.

[0378] FIG. 36 depicts steps of installing the blades 1230a-c of an offshore wind turbine according to an embodiment of the present disclosure (note that in FIG. 36, the blades 1230a-c are also depicted on an additional ship 1280 for illustrative purposes only).

[0379] In the example, a line extends from the cantilever portion 1285 to support each blade 1230a-c during the assembly of the offshore wind turbine. The line may extend to a clamp device 1290 or other support, and the clamp device 1290 or other support supports each blade 1230a-c during the assembly of the offshore wind turbine.

[0380] As described above, the present disclosure has been described with respect to preferred embodiments, but it should be understood that these embodiments are merely illustrative and the claims are not limited to these embodiments. Those skilled in the art can make modifications and substitutions in consideration of the present disclosure, and these are considered to be included within the scope of the appended claims. Each feature disclosed or illustrated in this specification can be incorporated into any embodiment, alone or in any suitable combination with any other feature disclosed or illustrated in this specification.

[0381] Clause: [Clause 1] An apparatus for assembling a structure such as a wind turbine or a jacket, a first erectable structure comprising a first plurality of legs connected by a first connection arrangement, a second erectable structure comprising a second plurality of legs connected by a second connection arrangement, an elongate structure extending between the first erectable structure and the second erectable structure, and a lifting arrangement configured to move a load along the elongate structure between the first erectable structure and the second erectable structure. [Clause 2] The first and / or second erectable structures are disposable in a first state, namely a folded or stored state, and a second state, namely an extended state, erectable or selectively movable extendably from the first state to the second state, and foldable or storable, or further selectively movable from the second state to the first state, the apparatus according to clause 1. [Clause 3] The first connection arrangement comprises a first top member substantially defining a first top of the first plurality of legs, The second connection arrangement comprises a second top member substantially defining a second top of the second plurality of legs, the apparatus according to clause 1 or 2. [Clause 4] The elongate structure extends directly below the first top and the second top, the apparatus according to clause 3. [Clause 5] The first erectable structure includes a tripod or tripod arrangement, and the first plurality of legs have exactly three legs, or The first erectable structure includes a quadrilateral or quadrilateral arrangement, and the first plurality of legs have exactly four legs, the apparatus according to any one of clauses 1 to 4. [Clause 6] The second erectable structure includes a tripod or tripod arrangement, and the second plurality of legs have exactly three legs, or The second erectable structure includes a pair of shear legs or an A-frame arrangement, and the second plurality of legs has exactly two legs, the apparatus according to any one of clauses 1 to 5. [Clause 7] Each leg of the first plurality of legs is attached to a first connection arrangement at or substantially at its respective first end, Each leg of the second plurality of legs is attached to a second connection arrangement at or substantially at its respective first end, Each leg of the first and second pluralities of legs has a mudmat provided at its respective second end, and optionally, each mudmat is selectively buoyant or submersible, the apparatus according to any one of clauses 1 to 6. [Clause 8] The apparatus according to clause 7, wherein each leg of the second plurality of legs is hingedly coupled to its respective mudmat at the second end. [Clause 9] The apparatus according to any one of clauses 1 to 8, wherein the elongate structure comprises a beam or a truss, and optionally, the elongate structure comprises a rail, a channel or a guide, along which at least a portion of the lifting arrangement is configured to move or be conveyed. [Clause 10] The cantilever portion of the elongate structure extends from the second erectable structure in a direction away from the first extensible structure, and optionally the cantilever portion is a tapered portion, the apparatus according to any one of clauses 1 to 9. [Clause 11] The lifting arrangement comprises an arrangement for connecting or supporting parts of the structure to be assembled, The lifting arrangement comprises one or more hooks or shackles, The lifting arrangement comprises a single-point lifting arrangement, and / or The apparatus according to any one of clauses 1 to 10, wherein the lifting arrangement comprises one or more pulleys and / or a winch arrangement. [Clause 12] The device according to any one of clauses 1 to 11, wherein each of the first and / or second plurality of legs includes a lattice or truss arrangement. [Clause 13] The device according to any one of clauses 1 to 12, wherein each of the first and / or second plurality of legs is configured to be extendable, and optionally, each of the first and / or second plurality of legs is configured to be extendable by insertion of an extension into each leg. [Clause 14] A system for assembling a structure such as a wind turbine or a jacket, comprising the device according to any one of clauses 1 to 13. [Clause 15] A system for assembling a structure according to clause 14, comprising a first body for transporting one or more parts of the structure to an assembly area provided below the lifting arrangement, the first body being a floating or buoyant body, and optionally, a first stabilizing arrangement for stabilizing the first body with respect to the bottom or floor of the body of water below the lifting arrangement. [Clause 16] A system for assembling a structure according to clause 14 or 15, comprising a second body for assembling the structure, and optionally, a second stabilizing arrangement for stabilizing the second body with respect to the bottom or floor of the body of water below the lifting arrangement, and optionally, the second body being a floating or buoyant body. [Clause 17] The system for assembling a structure according to clause 16, wherein the first and / or second stabilizing arrangement comprises at least one panel or member, and the at least one panel or member comprises at least one layer of drop stitch material. [Clause 18] A method of deploying a device for assembling a structure such as a wind turbine or a jacket, comprising: providing the device according to any one of clauses 1 to 13 at an assembly area or location; deploying / erecting the device; and including. [Article 19] Deploying / erecting the device comprises: erecting the first erectable structure so that it stands / lies on the bottom of the water mass when the first erectable structure is erected; erecting the second erectable structure so that it stands / lies on the bottom of the water mass when the second erectable structure is erected; using at least one lifting device, such as a lifting device coupled to the first erectable structure and / or the second erectable structure, to lift the elongate structure; coupling the elongate structure to the first and second erectable structures, wherein the elongate structure is provided with the lifting arrangement configured to move the load along the elongate structure between the first erectable structure and the second erectable structure, and after deployment / erection of the device, the lifting arrangement is provided above the surface level of the water mass, the method of Article 18. [Article 20] Erecting the second erectable structure comprises: coupling, by means of a hinged arrangement, each end of each of the second plurality of legs to a respective support structure, such as a mat, each of the second plurality of legs being arranged to extend in a first direction in a first state, i.e., a folded or stowed state; rotating each of the second plurality of legs about the hinged arrangement so that each of the second plurality of legs extends in a second direction, thereby transitioning the second erectable structure from the first state, i.e., a folded or stowed state, to the second state, i.e., an extended state, wherein the second direction is more upright than the first direction, the method according to Article 19. [Article 21] A method of assembling a structure such as a wind turbine or a jacket, comprising: ​​Deploying the device according to the method according to any one of clauses 18 to 20; Disposing a first base or body substantially below at least a part of the first erectable structure in the assembly area; Disposing a second base or body substantially below at least a part of the second erectable structure in the assembly area; Assembling the structure by configuring the lifting arrangement to lift the components of the structure from the first base or body towards the second base or body; A method of assembling a structure, comprising: [Clause 22] The method of assembling a structure according to clause 21, wherein the first base or body comprises a floating / floating barge or ship for carrying the components. [Clause 23] Disposing the first base or body in the assembly area comprises stabilizing the first base or body against the bottom or floor of the water mass below the lifting arrangement; Optionally, stabilizing the first base or body comprises configuring a stabilizing arrangement, such as a jack, to limit movement of the first base or body relative to the bottom or floor. A method of assembling a structure according to clause 21 or 22. [Clause 24] A method of assembling a structure according to any one of clauses 21 to 23, wherein the second base or body comprises a floating / floating ship, such as a floater for a wind turbine, for supporting the assembled structure. [Clause 25] Disposing the second base or body in the assembly area comprises stabilizing the second base or body against one of the water masses below the lifting arrangement / one of the water masses / the bottom or floor; Optionally, stabilizing the second base or body Disposing the second base or body on a grounded ship Disposing the second base or body on a floating ship Disposing the second base or body on the seabed and / or Mooring the second base or body A method of assembling a structure according to any one of clauses 21 to 24, comprising at least one of the above [Clause 26] The structure is A plurality of parts or components, A segmented (offshore) structure, A floating / floating foundation, A monopile, A jacket (e.g., a tripod jacket, a four-leg jacket or a torsion jacket) A method of assembling a structure according to any one of clauses 21 to 25, comprising or including the above [Clause 27] When the structure includes a wind turbine, The wind turbine is A column or tower section, A nacelle, A method of assembling a structure according to any one of clauses 21 to 26, comprising one or more of a plurality of parts or components including one or more of a plurality of turbine blades [Clause 28] An apparatus for assembling a structure such as an offshore structure, a wind turbine or a jacket, comprising An erectable structure, A post or column configured to extend through a central portion of the erectable structure An apparatus including the above [Clause 29] The post or column is mounted on a floating structure, and the apparatus of clause 28 [Clause 30] The central part of the erectable structure is configured to be walked on top of the post or column during the erection process of the erectable structure, for the device of clause 28 or 29. [Clause 31] The device of claim 30, comprising one or more walking clamps for walking on top of the post or column and over the central part of the erectable structure. [Clause 32] The device of clause 30 or 31, wherein the central part comprises a traveling gear module configured to travel up and down the post or column. [Clause 33] The post or column is provided with one or more winches at its upper or top part, and the one or more winches are configured to lift the upper or top part of the erectable structure, or When citing clause 29, the post or column is provided with one or more return sheaves and a winch on, above, or substantially near the deck of the floating structure, for the device of clause 32. [Clause 34] The post or column comprises a primary post or column, and the primary post or column comprises at least one additional post or column disposed inside the primary post or column, and the primary post or column and the at least one additional post or column are arranged in a telescopic arrangement, for the device of any one of clauses 28 to 33. [Clause 35] The erectable structure comprises a tripod with three legs, and each base part of the legs is further provided with a mudmat. For the device of any one of clauses 28 to 34. [Clause 36] A first plurality of pins and U - link arrangements configured to couple the top assembly to the three legs, and When citing clause 32, a second plurality of pins and U - link arrangements configured to fix the traveling gear module to the three legs comprising the device of clause 35. [Clause 37] The device according to clause 35 or 36, comprising a tension member disposed between the bases of the legs. [Clause 38] Each mudmat is ballasted by at least one of water, mud or hematite, sheet piles disposed around the perimeter of each mudmat, pile anchors, suction anchors, or dry anchors attached by chains, wires or ropes securing a line to the shore The device according to any one of clauses 35 to 37. [Clause 39] The erectable structure is extensible or selectively movable from a first state, i.e., a folded state, to a second state, i.e., an extended or erected state, and foldable or further selectively movable from the second state to the first state, of the device according to any one of clauses 28 to 38. [Clause 40] A method of erecting an erectable structure, comprising: providing an erectable structure; providing a post or column configured to extend through a central portion of the erectable structure; raising the central portion of the erectable structure relative to the post or column; and. [Clause 41] transporting the erectable structure in a folded state to a location for assembling an offshore structure; and then erecting the erectable structure when at that location; The method according to clause 40. "Clause 42] The method of clauses 40 or 41, wherein the erectable structure is installed with a plurality of components, and the plurality of components are joined together on the deck and / or lowered onto the top of the post or column and / or assembled around the post or column. [Clause 43] The method according to any one of clauses 40 to 42, wherein the erection of the erectable structure includes walking up the post or column using one or more walking clamps to walk on the central portion of the erectable structure. [Clause 44] While the central portion of the erectable structure is being raised, A traction force is applied to a tension member, such as a line, between the center and the base of the leg of the erectable structure, or A traction force is applied to a tension member between the bases of the legs of the erectable structure, the method according to any one of clauses 40 to 43. [Clause 45] The method according to any one of clauses 40 to 44, wherein providing the post or column includes placing the top of the erectable structure around the post or column and providing the post or column on a floating structure. [Clause 46] The method of clause 45, including lowering and / or extending the floating structure or at least a part thereof to the seabed. [Clause 47] Installing one or more winches on the post or column, and Configuring the one or more winches to lift the upper or top part of the erectable structure The method according to any one of clauses 40 to 46, including. [Clause 48] The post or column includes a primary post or column, the primary post or column includes at least one further post or column disposed inside the primary post or column, the primary post or column and the at least one further post or column are arranged in a telescopic arrangement, and during the erection of the erectable structure, when the upper part or topmost part of the erectable structure is raised to reach the topmost part or upper part of the post or column, the at least one further post or column is telescoped to enable the continuation of raising the upper part or topmost part of the erectable structure, according to any of the methods of clauses 40 to 47. [Clause 49] A device or apparatus for assembling an offshore structure, such as a wind turbine or a jacket, a device or apparatus for assembling a wind turbine or a jacket, the apparatus comprising an (vertically) erectable structure and a lifting arrangement. [Clause 50] When erected, the apparatus provides an assembly area above, for example, an area of water, such as the seabed or floor of a water mass, such as the seabed, and below the lifting arrangement. The assembly area is provided, for example, when erected, below the lifting arrangement, for example, directly below. One / the assembly area is provided within the perimeter, area or volume of the device or apparatus, and / or The lifting arrangement is provided above the assembly area, for example, directly above, the device or apparatus according to clause 49. [Clause 51] The structure can be arranged in a first state, i.e., a folded state. The structure can be arranged in a second state, i.e., an extended state. The structure can be extended, erected or selectively moved from the first state to the second state, and / or The structure can be folded or selectively moved from the second state to the first state, and / or The structure can be assembled and / or installed on-site or in-situ, The structure includes a plurality of legs and / or top members, optionally The legs are connected or connectable to the top member, and / or the lifting arrangement is provided, in use, below, for example directly below, the top member, and / or One or more of the legs have different lengths, a device or apparatus according to any of clauses 49 or 50. [Clause 52] The device or apparatus includes a tripod or tripod arrangement, or a four-legged body or four-legged arrangement, or first and second adjacent towers, In the case of a tripod, the tripod includes three legs, Each of the legs is attached, for example in a hinged manner, to a connecting member at a first end, optionally the connecting member includes the top of the tripod, and / or each leg has a mudmat provided at a second end, optionally the / each mudmat is optionally buoyant or submersible, In the case of a four-legged body, A pair of opposing legs are of the same length, which length is different from the length of another pair of opposing legs, In either case, The lifting arrangement is attached to or hangs (vertically downwards) from one of the connecting members or the top such that the lifting arrangement is provided between the legs or towers, a device or apparatus according to any of clauses 49 to 51. [Clause 53] The lifting arrangement includes an arrangement for connecting or supporting the parts of the structure to be lifted, The lifting arrangement includes one or more hooks or shackles, The lifting arrangement includes a single-point lifting arrangement, and / or The lifting arrangement includes one or more pulley arrangements, a device or apparatus according to any of clauses 49 to 52. [Clause 54] One or more lines (control / mooring / tagging lines) are provided between at least one, preferably each, of the plurality of / said legs or towers, and said lines are adapted to be connected to a load lifted by said lifting arrangement, such as a component of said structure, and optionally, A connection piece is provided at the intersection of said lines, for example below the top member, of the device or apparatus according to any one of clauses 49 to 53. [Clause 55] One or more legs of said device or apparatus comprise a (metal) lattice arrangement and / or A further line or cable is provided at or near the distal end of said leg of said top member, between adjacent legs, and / or Another further line is provided at or near the end of each leg, said further line extending (horizontally) so as to intersect at the (base) center point of said apparatus, for example below said top member, of the device or apparatus according to any one of clauses 49 to 54. [Clause 56] An offshore structure, such as a wind turbine (generator) or a jacket, a system for assembling a structure, such as a wind turbine (generator) or a jacket, comprising a device or apparatus according to any one of clauses 49 to 55. [Clause 57] The system according to clause 56, comprising a floating or buoyant body for transporting one or more parts of said structure to one / said assembly area. [Clause 58] The system comprises one or more winches for controlling, for example, said lifting arrangement, Optionally, said one or more winches are provided on a further floating or buoyant body, Optionally, said further floating or buoyant body is adapted to be fastened to the legs of said device or apparatus, The further floating body or buoyant body comprises a slot or recess for engaging with the legs of the device or apparatus and / or for receiving the connecting member during transportation of the device / apparatus in a folded state, a system for assembling the structure according to any of clauses 56 or 57. [Clause 59] A method of deploying a device or apparatus for assembling a (floating / buoyant) offshore structure such as a wind turbine (generator), a structure such as a wind turbine (generator) or a jacket, comprising: providing the device or apparatus according to any of clauses 49 to 55 at or to an assembly area or location; deploying / erecting the device or apparatus; A method of deploying a device or apparatus, including the above. [Clause 60] The assembly location is an area of water, for example, the bottom or floor of a body of water, such as an area above the seabed. The device / apparatus is erected / positioned on the bottom of a body of water, such as the seabed, when erected. The top and the lifting arrangement are provided above the surface level of the body of water. The step of providing the device or apparatus at the assembly location includes, for example, using one or more ships or barges to transport the device or apparatus or one or more of its parts / components together or individually, a method of deploying a device or apparatus according to clause 59. [Clause 61] A method of assembling an offshore structure, a structure such as a wind turbine (generator) or a jacket, or a wind turbine (generator), comprising: deploying the device or apparatus according to the method described in clause 59 or 60; transporting a first part of the structure to the assembly area; lifting the first part using the lifting arrangement; Transporting a floating / floating base or basic body to the assembly area, Connecting / clamping the first part of the structure to the floating / floating base body A method for assembling a structure or a wind turbine, including. [Article 62] Subsequently, the method Transporting a further part of the structure to the assembly area, Lifting the further part using the lifting arrangement, Transporting the floating / floating base to the assembly area, Lowering and / or connecting the further part of the structure to the first part / one part of the structure already provided on the floating / floating base A method for assembling a structure or a wind turbine according to Article 61, including. [Article 63] The method for assembling a structure or a wind turbine according to any one of Articles 61 or 62, wherein the structure is a floating structure. [Article 64] The structure is A plurality of parts or components, A segmented (offshore) structure, A floating / floating foundation, A monopile, A jacket (e.g., a tripod jacket, a four-legged jacket or a torsion jacket) A method for assembling a structure or a wind turbine according to any one of Articles 61 to 63, comprising or including. [Article 65] In the case of the structure comprising a wind turbine, The wind turbine is A column or tower (e.g., first and second column parts), A nacelle, A plurality of turbine blades (e.g., three turbine blades) comprising one or more of a plurality of parts or components, and / or The wind turbine comprises a given number of parts / six parts, whereby the assembly requires the same given number of lifts / six lifts, a method of assembling a structure or wind turbine according to any one of clauses 61 to 63. [Clause 66] A method of assembling an (offshore) structure such as an (offshore) wind turbine or an (offshore) jacket, providing a lifting arrangement, said lifting arrangement comprising a gantry disposed above and / or directly above an area of water, and lifting means or devices coupled to said gantry and providing; stacking a plurality of parts of said structure; including The step of stacking a plurality of parts of said structure comprises transportably disposing a first part of the structure relative to or in the area of water, lifting said first part using said lifting means, configuring a clamping device or holding device to grip said first part, transporting said clamping device or holding device away from the area of water, lifting a second part of the structure using said lifting means or device, placing said first part below or adjacent to said second part by further transporting said first part, gripped by said clamping device, into the area of water, stacking by lowering said second part onto or into connection with said first part; A method of assembling an (offshore) structure including. [Clause 67] The step of lifting the second part using the lifting means or device comprises winding up and / or raising the second part upward to a height above the uppermost level of the first part, method for assembling an (offshore) structure according to clause 66. [Clause 68] The method comprises fixedly connecting the second part to the first part by bolting, welding and / or clamping, The structure is, for example, a wind turbine assembly such as an offshore wind turbine for supporting a wind turbine, or a jacket such as an offshore jacket, and / or The first part and / or the second part and / or one or more further parts are at least one of a part of a tower or a nacelle or a turbine blade, method for assembling an (offshore) structure according to any of clauses 66 or 67. [Clause 69] The method further comprises placing the one / further part on the second part, lifting the further part using the lifting means or device, placing the second part of the structure under the further part by transporting the second part to the water area, lowering / moving the further part onto / against the second part and stacking steps, method for assembling an (offshore) structure according to any of clauses 66 to 68. [Clause 70] The clamping device is provided on a floating or buoyant body, such as a floating foundation or a (top) crown assembly, and / or The clamping device is configured to support and / or clamp and / or grip at least a part of the structure in a vertical arrangement and / or a substantially upright configuration, method for assembling an (offshore) structure according to any of clauses 66 to 69. [Clause 71] A system for assembling a structure such as an offshore wind turbine or an offshore jacket, a gantry disposed above and / or directly above an area of water, and lifting means or assemblies coupled to the gantry, and means or devices for transporting a part of the structure between the water area and comprising, wherein the means or devices for transporting a part of the structure comprise a clamping device or a holding device, a system for assembling a structure. [Article 72] The clamping device or holding device is configurable between a clamping or holding configuration for gripping a part of the structure and a non-clamping or non-holding configuration, The clamping device is coupled or mounted to one / said floating or buoyant base body, for example, a floating foundation or (top) crown assembly or raft, a system for assembling a structure according to Article 71. [Article 73] The lifting means comprise a winch and / or a pulley, The system is adapted to assemble an offshore wind turbine assembly or a wind turbine assembly such as an offshore jacket assembly for a wind turbine, for example, or a jacket, The system comprises a clamping system and / or a gripping system, the clamping system and / or the gripping system the clamping device for gripping at least a part of the wind turbine assembly, and one / said floating or buoyant body and comprising, wherein the clamping device is mounted on the floating or buoyant body, wherein the clamping device is configured to support at least a part of the wind turbine assembly or the jacket assembly in a vertical arrangement and / or in a substantially upright configuration. The clamping device is a system for assembling a structure according to either of clauses 71 or 72, configured to engage a flange or rim disposed on an outer surface of one of / a part of the structure.

Claims

1. A method of assembling an offshore wind turbine such as a floating offshore wind turbine, comprising: transporting the nacelle and tower of the offshore wind turbine to an assembly area below a support device by one or more ships; lowering the tower and the nacelle from the support device; transporting a floating / buoyant base or foundation body to the assembly area below the support device; landing the tower on the floating / buoyant base or foundation body and landing the nacelle on the tower. A method as described above.

2. The method according to claim 1, wherein the nacelle and the tower are transported together to the assembly area by a single ship.

3. The tower comprises a plurality of tower parts, and the tower is transported to the assembly area in a disassembled state. The method according to claim 1, further comprising assembling the tower from the plurality of tower parts onto the one or more ships before the (assembled) tower is lowered from the support device.

4. The method according to claim 3, including using a lifting arrangement of the support device to stack the plurality of tower parts for assembling the tower.

5. The ship comprises a sea surface fixed grid structure for supporting the plurality of tower parts. Optionally, the grid structure is raised to allow personnel access to the interior of each tower part. The method according to claim 3 or 4.

6. The step of lowering the nacelle from the support device includes using one or more lines or slings to lower the nacelle in a holding position. Optionally, the holding position is offset from a vertical axis extending through the top of the support device. The method according to any one of claims 1 to 5.

7. The step of landing the nacelle on the tower includes horizontally holding the nacelle from the holding position to a landing position substantially below the top of the support device. The method according to claim 6.

8. The floating / buoyant base or foundation body comprises a floater, a floating spar, a tension leg platform, a barge, or a semi-submersible offshore drilling platform. The method according to any one of claims 1 to 7.

9. A method according to any of claims 1 to 8, comprising stabilizing the floating / buoyant base or foundation body with respect to the seabed or floor of the water mass in the assembly area using a stabilizing arrangement including at least one of a jack, a mooring arrangement, an anchor arrangement, and / or a grounded ship.

10. In one / said ship, a subsequent step of transporting a plurality of blades of the offshore wind turbine to the assembly area, and A subsequent step of using one / said lifting arrangement of the support device to lift each of the plurality of blades for attachment to the nacelle A method according to any of claims 1 to 9, comprising.

11. The support device includes a cantilever portion extending from a leg and / or a top of the support device, and the method includes lifting each of the plurality of blades by one or more lines extending from the cantilever portion. The method of claim 10.

12. The support device includes an erectable tripod structure and a lifting arrangement, and when the erectable tripod structure is erected, the assembly area is provided below the lifting arrangement. A method according to any of claims 1 to 11.

13. A support device for assembling an offshore wind turbine such as a floating offshore wind turbine, An erectable tripod structure, A lifting arrangement for lifting the tower and / or nacelle of the offshore wind turbine, the lifting arrangement being provided above the assembly area when the tripod structure is erected, And a support arrangement for suspending the tower and / or the nacelle from the erectable tripod structure A support device including.

14. The support arrangement of claim 13, wherein the support arrangement comprises one or more couplings or nodes provided on a top member or a leg of the erectable tripod structure for suspending the nacelle. Support device.

15. The support device of claim 14, including one or more slings or lines for suspending the nacelle from the one or more couplings or nodes.

16. The support device according to any of claims 12 to 15, comprising a cantilever portion extending from a top member or a leg of the erectable tripod structure for suspending one or more blades of the offshore wind turbine.

17. The erectable tripod structure can be arranged in a first state, i.e., a folded state. The erectable tripod structure can be arranged in a second state, i.e., an extended state. The erectable tripod structure can be extended, erected, or selectively moved from one / the first state to one / the second state, and / or The erectable tripod structure can be folded or selectively moved from the second state to the first state. The erectable tripod structure can be assembled and / or erected on-site or in place. A plurality of legs of the erectable tripod structure are connected or connectable to the top member, and / or, the lifting arrangement is provided below the top member, for example, directly below, during use, and / or Each of the plurality of legs of the erectable tripod structure is attached to the top member at a first end, for example, in a hinged manner, and / or, each leg is provided with a mud mat at a second end, and optionally, each / the mud mat is selectively buoyant or submersible, a support device according to any one of claims 12 to 16.

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