Claims:Claims:

We claim:

1. A framework arrangement for a wind turbine, the framework arrangement comprising:
- a framework having a first axis of elongation and a plurality of sides in-cluding a first support side;
- a movable framework having a second axis of elongation and configured to be supported, in use on the first support side and/or such that the first and second axes of elongation are substantially parallel;
- wherein at least part of the movable framework is movable between a first configuration and a second configuration, and in that a combined dimension of the framework combined with the movable framework in a direction orthogonal to the plane of the first support side is smaller when the movable framework is in the first configuration than when the mova-ble framework is in the second configuration and
- wherein the movable framework is shorter along the second axis of elon-gation than is the framework in the first axis of elongation.

2. The framework arrangement as claimed in claim 1, wherein the framework and/or movable framework are configured to be disposed with the first axis of elongation and second axis of elongation, respectively, disposed horizontally, and in that the combined dimension is the combined height of the framework and movable framework.

3. The framework arrangement as claimed in claim 1 or 2, wherein the movable framework includes, spaced apart thereon in a direction parallel to the second axis of elongation, a plurality of support members and wherein the movable framework includes an engagement side configured to be disposed, in use, at or adjacent the first support side and, on a side of the movable framework opposite the engagement side, a second support side.

4. The framework arrangement as claimed in one of the claims 1 to 3, wherein along each lateral edge of the movable framework, lateral with respect to the second axis of elongation, a plurality of support members are disposed.

5. The framework arrangement as claimed in claim 4, wherein the movable framework includes, at said second support side, a planar first sub-framework and wherein for each support member,
- a first attachment element, configured to engage a first end of the sup-port member, disposed on the first sub-framework, wherein the support member is movable or rotatable relative to the first attachment element, and/or
- a second attachment element, configured to engage a second end of the support member, opposite the first end, is disposed at or adjacent the first support side, wherein the support member is movable or rotatable relative to the second attachment element.

6. The framework arrangement as claimed in claim 5, wherein for each support member, the first attachment element includes a first shear field having a first bore extending parallel to the plane of the first sub-framework, the first bore being configured to receive a first axle element passing through the first end of the support member and through the first shear field, whereby the support member is rotatable about the first axle element, and/or the second attachment element includes a second shear field having a second bore extending parallel to the plane of the first support side, the second bore being configured to re-ceive a second axle element passing through the second end of the support member and through the second shear field, whereby the support member is rotatable about the second axle element.

7. The framework arrangement as claimed in claim 6, wherein the movable framework includes, at said engagement support side, a planar second sub-framework, and in that for each support member, the second attachment ele-ment is disposed on the second sub-framework and wherein the second sub-framework is fixedly attached, in use, to the framework and wherein for each support member, the second attachment element is disposed on the frame-work at said first support side.

8. The framework arrangement as claimed in claim 7, wherein each first shear field and each second shear field (i) extends parallel to the first axis of elon-gation or the second axis of elongation, (ii) lies in a plane that is aligned with a respective lateral edge of the second support side or the engagement side, and/or (iii) lies in a plane that is orthogonal to the plane of the second support side or the engagement side.

9. The framework arrangement as claimed in one of the claims 1 to 8, wherein including a plurality of hydraulic members, each hydraulic member being fix-edly attached at one end thereof at or adjacent the first support side and at the other end thereof to a respective support member and wherein the other end is attached closer to the first end of the support member than to the sec-ond end and wherein each hydraulic member is configured to be driven in or-der to move a respective support member from the first orientation to the sec-ond orientation and/or to move the movable framework from the first config-uration to the second configuration.

10. The framework arrangement as claimed in claim 9, wherein further including a plurality of angle-beams, wherein for each angle-beam comprises,
- a third end of the angle-beam is configured to be rotatably attached via a respective first axle element to a first attachment element to which a first support member is attached, and
- a fourth end of the angle-beam, opposite the third end, is configured to be a free end when the movable framework is in the first configuration and configured to be attached to a respective second attachment element to which a second support member, adjacent the first support member, is attached, when the movable framework is in the second configuration.

11. The framework arrangement as claimed in one of the claims 4 to 10, wherein further including a roof elevation framework, the roof elevation framework being fixedly attached to the first sub-framework and to at least a portion of a nacelle of the wind turbine, wherein the roof elevation framework is movable between a third configuration, in which the at least a portion of a nacelle is adjacent and/or substantially aligned with the first sub-framework or a re-mainder of the nacelle, and fourth configuration, in which the at least a por-tion of a nacelle is spaced apart from the first sub-framework.

12. A nacelle of a wind turbine comprising a framework arrangement as claimed in one of the claims 1 to 11.

13. A wind turbine (2) comprising a nacelle as claimed in claim 12.

14. A method mounting a framework arrangement on, or maintaining components of, a wind turbine (2), the method comprising:
- providing an framework as claimed in one of the claims 1 to 12;
- transporting the framework arrangement to a site of the wind turbine while the movable framework is in the first configuration;
- mounting the framework arrangement on the wind turbine; and
- moving the movable framework from the first configuration to the sec-ond configuration.

Dated this 9th day of November 2021
, Description:TITLE

FRAMEWORK ARRANGEMENT FOR A WIND TURBINE, A WIND TURBINE AND A METHOD OF MOUNTING

TECHNICAL FIELD

The invention relates to components of a wind turbine, and more particularly to a framework arrangement for a wind turbine, a wind turbine and a method mount-ing a framework arrangement on, or maintaining components of, a wind turbine.

BACKGROUND

In the deployment of wind turbines it is conventional to load components such as nacelles and frameworks and their components onto trucks or trailers for transport to the destination site, when components are then mounted on the wind turbine in situ.

However, due to the increasing size of wind turbines, it becomes more and more difficult to comply with the transport requirements. The width and the height are major parameters for transport. If the nacelle is too high some sites cannot be reached (e.g. due to the presence of low-clearance bridges) and this means the manufacturer is not able to deliver geographical locations, meaning that wind en-ergy cannot be generated in certain areas.

Modern wind turbines contain on-board cranes (e.g. including a crane hook) for removing, deploying or moving components on the wind turbine). These cranes need a minimum height to lift the loads inside the turbine. Bridge cranes, in par-ticular, have a fixed height, which is defined by a runway beam at the top of, e.g. the framework of the nacelle. These runaway beams are commonly one of the highest points of the nacelle structure. For this reason, most suppliers instead ei-ther (i) use “knuckle boom” cranes, which are very flat, (ii) assemble the additional frameworkwork for the bridge cranes at the site or the nacelle is perma-nently higher as required for operating mode, which increases structural loads due to wind.

Thus, a problem with known techniques is that Knuckle boom cranes are more expensive than bridge cranes, which increases the price of the wind turbine. A further problem is that the assembly of the framework for a bridge crane at the site contains risks and requires a lot of time, which causes a lower AEP.

The present invention seeks to overcome the aforementioned problems and to pro-vide an improved framework arrangement for a wind turbine, a wind turbine and a method mounting a framework arrangement on, or maintaining components of, a wind turbine.

SUMMARY

According to one aspect of the invention there is provided a framework arrange-ment for a wind turbine, the framework arrangement comprising a framework hav-ing a first axis of elongation and a plurality of sides including a first support side. The framework arrangement further comprises a movable framework having a sec-ond axis of elongation and configured to be supported, in use on the first support side and/or such that the first and second axes of elongation are substantially par-allel. At least part of the movable framework is movable between a first configura-tion and a second configuration, and in that a combined dimension of the frame-work combined with the movable framework in a direction orthogonal to the plane of the first support side is smaller when the movable framework is in the first con-figuration than when the movable framework is in the second configuration and wherein arrangement includes, on a side of the movable framework opposite the first support side, support beams configured for supporting, in use, a movable crane or crane hook.

Advantageously, the first sub-framework comprises rails configured for support-ing, in use, rollers of a rolling crane or crane hook.

Advantageously, the movable framework is shorter along the second axis of elon-gation than is the framework in the first axis of elongation.

Advantageously, the movable framework includes, at one or both ends thereof and aligned with a respective support beam or rail, a projection arm configured for supporting, in use, the movable crane or crane hook.

In a preferred embodiment of the framework arrangement, the framework and/or movable framework are configured to be disposed with the first axis of elongation and second axis of elongation, respectively, disposed horizontally, and in that the combined dimension is the combined height of the framework and movable framework.

In a preferred embodiment of the framework arrangement,, the movable frame-work includes, spaced apart thereon in a direction parallel to the second axis of elongation, a plurality of support members and wherein the movable framework includes an engagement side configured to be disposed, in use, at or adjacent the first support side and, on a side of the movable framework opposite the engage-ment side, a second support side. In a preferred embodiment of the framework arrangement, along each lateral edge of the movable framework, lateral with re-spect to the second axis of elongation, a plurality of support members are dis-posed.

Advantageously, each support member is movable between a first orientation, cor-responding to the first configuration, and a second orientation, corresponding to the second configuration.

In a preferred embodiment of the framework arrangement,, the movable frame-work includes, at said second support side, a planar first sub-framework and wherein for each support member, a first attachment element, configured to en-gage a first end of the support member, disposed on the first sub-framework, wherein the support member is movable or rotatable relative to the first attachment element, and/or a second attachment element, configured to engage a second end of the support member, opposite the first end, is disposed at or adjacent the first support side, wherein the support member is movable or rotatable relative to the second attachment element.

In a preferred embodiment of the framework arrangement, for each support mem-ber, the first attachment element includes a first shear field having a first bore ex-tending parallel to the plane of the first sub-framework, the first bore being con-figured to receive a first axle element passing through the first end of the support member and through the first shear field, whereby the support member is rotatable about the first axle element, and/or the second attachment element includes a sec-ond shear field having a second bore extending parallel to the plane of the first support side, the second bore being configured to receive a second axle element passing through the second end of the support member and through the second shear field, whereby the support member is rotatable about the second axle ele-ment.

In a preferred embodiment of the framework arrangement, the movable frame-work includes, at said engagement support side, a planar second sub-framework, and in that for each support member, the second attachment element is disposed on the second sub-framework and wherein the second sub-framework is fixedly attached, in use, to the - framework and wherein for each support member, the second attachment element is disposed on the framework at said first support side.

In a preferred embodiment of the framework arrangement, each first shear field and each second shear field (i) extends parallel to the first axis of elongation or the second axis of elongation, (ii) lies in a plane that is aligned with a respective lateral edge of the second support side or the engagement side, and/or (iii) lies in a plane that is orthogonal to the plane of the second support side or the engagement side.

Advantageously, the at least one first attachment element and/or at least one sec-ond attachment element includes a second bore extending parallel to the first bore on that attachment element, and in that the second bore is configured to receive a fixing element when a respective support member is in the second orientation and/or to fix the movable framework in the second configuration. More advanta-geously, for each first attachment element and/or each second attachment element, a line joining the centers of the first bore and the second bore extends orthogonal-ly to the second support side and/or to the engagement side.

In a preferred embodiment of the framework arrangement, the framework ar-rangement further includes a plurality of hydraulic members, each hydraulic mem-ber being fixedly attached at one end thereof at or adjacent the first support side and at the other end thereof to a respective support member and wherein the oth-er end is attached closer to the first end of the support member than to the second end and wherein each hydraulic member is configured to be driven in order to move a respective support member from the first orientation to the second orienta-tion and/or to move the movable framework from the first configuration to the second configuration. In a preferred embodiment of the framework arrangement, the framework arrangement may further include a plurality of angle-beams, where-in for each angle-beam, a third end of the angle-beam is configured to be rotatably attached via a respective first axle element to a first attachment element to which a first support member is attached, and/or a fourth end of the angle-beam, opposite the third end, is configured to be a free end when the movable framework is in the first configuration and configured to be attached to a respective second attach-ment element to which a second support member, adjacent the first support mem-ber, is attached, when the movable framework is in the second configuration. Ad-vantageously, also other linear actors are usable like linear motor, spindle/screw drive, rack and pinion drive.

In a preferred embodiment, the framework arrangement further includes a roof elevation framework, the roof elevation framework being fixedly attached to the first sub-framework and to at least a portion of a nacelle of the wind turbine, wherein the roof elevation framework is movable between a third configuration, in which the at least a portion of a nacelle is adjacent and/or substantially aligned with the first sub-framework or a remainder of the nacelle, and fourth configura-tion, in which the at least a portion of a nacelle is spaced apart from the first sub-framework.

According to another aspect of the invention there is provided a nacelle of a wind turbine comprising a framework arrangement according to one of the foresaid em-bodiments.

According to another aspect of the invention there is provided a wind turbine comprising a nacelle having a framework arrangement according to one of the foresaid embodiments.

According to another aspect of the invention there is provided a method mounting a framework arrangement on, or maintaining components of, a wind turbine (2), the method comprising: providing an framework arrangement according to any of claims 1 to 24 of the appended claims; transporting the framework arrangement to a site of the wind turbine while the movable framework is in the first configura-tion; mounting the framework arrangement on the wind turbine; and moving the movable framework from the first configuration to the second configuration.

Advantages of the invention, at least in embodiments, are (1) that the costs erec-tion of the wind turbine at the site are decreased; (2) during transport a lower height is afforded, enabling delivery to more geographical locations; (3) higher lift heights of the bridge crane are afforded – for lifting large component parts inside the nacelle; (4) the additional (movable/foldable) framework supports the main structure of the nacelle; (5) in the case of the use of hydraulic members, (i) the height of the nacelle may be decreased, saving material for nacelle cover and (ii) good air ventilation while servicing is carried out is afforded.

BRIEF DESCRIPTION OF THE DRAWINGS

Further details of the invention will become apparent from the drawings according to the description. In the drawings:

Figure 1 (PRIOR ART) is a perspective view from above of the upper part of a known form of wind turbine;

Figure 2(a) is a perspective view of a framework arrangement according to an embodiment of the invention, and Fig. 2(b) is a lateral view of the framework arrangement of Fig. 3(a);

Figure 3(a) is a lateral view of part of the framework arrangement of Fig. 2(a), showing support members and attachment members, and Fig. 3(b) is an enlarged lateral view of an attachment member of Fig. 3(a);

Figures 4(a) to 4(c) are lateral views of the framework arrangement of Fig. 2(a) at various stages during the erection thereof, i.e. moving between the first configura-tion and the second configuration, and Figs 4(d) to 4(f) are lateral views showing relative positions of support members and attachment members at each of the stages shown in Figs 4(a) to 4(c), respectively;

Figures 5(a) to 5(c) are lateral views of a framework arrangement according to another embodiment of the invention at various stages during the erection thereof,

Figures 6(a) to 6(c) are lateral views of a framework arrangement according to another embodiment of the invention at various stages during the erection thereof,

Figures 7(a) to 7(c) are lateral views showing relative positions of support mem-bers and attachment members at each of the stages shown in Figs 6(a) to 6(c), re-spectively according to a first variant, and Figures 7(d) to 7(f) are lateral views showing relative positions of support members and attachment members at each of the stages shown in Figs 6(a) to 6(c), respectively according to a second variant;

Figures 8(a) to 8(c) are lateral views of a frame arrangement according to another embodiment of the invention at various stages during the erection thereof, i.e. moving between the first configuration and the second configuration, and Figures 8(d) to 8(f) are lateral views showing relative positions of support members and attachment members at each of the stages shown in Figs 8(a) to 8(c), respectively;

Figures 9(a) to 9(c) are lateral views of a framework arrangement according to another embodiment of the invention at various stages during the erection thereof, i.e. moving between the first configuration and the second configuration,

Figs 9(d) to 9(f) are lateral views showing relative positions of support members and attachment members at each of the stages shown in Figs 9(a) to 9(c), respec-tively, and Fig. 9(g) is an enlarged partial view of a support member and attach-ment member of Fig. 9(f);

Figures 10(a) and 10(b) are lateral views of a framework arrangement according to another embodiment of the invention at various stages during the erection thereof.

DETAILED DESCRIPTION

In the following, like reference numerals denote like parts, and any element, de-sign feature or method step of any embodiment may be used in combination with an element, design feature or method step of any other embodiment unless stated otherwise herein.

Unless indicated otherwise, the components described/illustrated herein may be made of titanium or steel, and/or may be fabricated using casting, turning and/or machining.

Figure 1 (PRIOR ART) is a perspective view from above of the upper part of a wind turbine 2. As shown, the wind turbine 2 has a tube tower 3 known from the prior art, a nacelle 4 rotably mounted on the tower 3 about axis 7 and a rotor 5 with a hub 8 and three rotor blades 6 which are each rotatably mounted about a blade axle 1. The hub 8 is mounted on a rotor shaft (not shown) which is rotatably mounted on a main frame (not shown) within the nacelle 4.

Figure 2(a) is a perspective view of a framework arrangement 20 according to an embodiment of the invention, and Fig. 2(b) is a lateral view of the framework arrangement 20 of Fig. 2(a). In accordance with the invention, the framework ar-rangement 20 comprises a framework 9 having a first axis of elongation A and a plurality of sides including a first support side 12. The framework 9 is described in detail in the patent application No. 202021017146 filed on April 21, 2020 by the applicant of the present patent application. The content of patent application No. 202021017146 is fully integrated to the present patent application. The framework arrangement 20 further comprises a movable framework 21 having a second axis of elongation B and configured to be supported, in use on the first support side 12 and/or such that the first and second axes of elongation A and B are substantially parallel. At least part of the movable framework 21 is movable between a first configuration (not shown) and a second configuration. Moreover, the movable framework 21 is configured such that a combined dimension H of the framework 9 combined with the movable framework 21 in a direction orthogonal to the plane of the first support side 12 is smaller when the movable framework 21 is in the first configuration than when the movable framework 21 is in the second configu-ration.

Preferably, the framework 9 and/or movable framework 21 are configured to be disposed with the first axis of elongation A and second axis of elongation B, re-spectively, disposed horizontally, and the combined dimension is the combined height H (Fig. 2(b)) of the framework 9 and movable framework 21.

In the embodiment of Fig. 2(a) and 2(b), the movable framework 21 includes, spaced apart thereon in a direction parallel to the second axis of elongation B, a plurality of support members 22. Preferably, the movable framework 21 includes an engagement side 23 configured to be disposed, in use, at or adjacent the first support side 12 and, on a side of the movable framework 21 opposite the engage-ment side 29, a second support side 24.

Preferably, along each lateral edge 25, 26 of the movable framework 21, lateral with respect to the second axis of elongation B, a plurality of support members 22 are disposed. In the embodiment of Fig. 2(a) and 2(b), the movable framework 21 includes, at said second support side 24, a planar first sub-framework 27.

Preferably, the framework arrangement 20 includes, on the second support side 24 of the movable framework 21 opposite the first support side 12 (e.g. as part of the first sub-framework 27), horizontal support beams 28, e.g. extending most or all of the length of the first sub-framework 27 and/or movable framework 20, and con-figured for supporting, in use, a movable (bridge) crane or crane hook 29. In an embodiment, the first sub-framework 27 comprises rails configured for supporting, in use, rollers of a rolling crane or crane hook 29.

Referring to Fig. 2(a), in embodiments, the movable framework 21 includes an-gled (e.g. diagonal) beams 30, e.g. to ensure shear fields in beam connections are within desirable limits. In embodiments, the movable framework 21 includes (hor-izontal) cross beams 31, the position/orientation indicated in Fig. 2(a) being best for affording free movement of the bridge crane 29.

In embodiments, the beams of the movable framework 21 indicated in solid black lines in Figs 2(a) and 2(b) are required elements (i.e. for sufficient stability of the structure and for supporting the bridge crane 29). Optionally, the movable frame-work 21 includes secondary beams 32, i.e. in order to provide the necessary stabil-ity depending on the weight of the components 18 (especially the transformer) within the framework 9. Optionally, the movable framework 21 includes tertiary beams 33, i.e. in order to provide a wider (longer) range of movement for the bridge crane 29.

Preferably, the each support member 22 is movable (e.g. rotated) between a first orientation (e.g. substantially horizontal; not shown), corresponding to the first configuration of the movable framework 21, and a second orientation (e.g. verti-cal; Figs 2(a) and 2(b)), corresponding to the second configuration of the movable framework 21.

Figure 3(a) is a lateral view of part of the framework arrangement 20 of Fig. 2(a), showing support members 22 and attachment elements 34 and 35. Preferably, for each support member 22, a first attachment element 34, configured to engage a first end 36 of the support member 22, is disposed on the first sub-framework 27. Preferably, the support member 22 is movable or rotatable relative to the first at-tachment element 34. Preferably, a second attachment element 35 is configured to engage a second end 37 of the support member 22, opposite the first end 36, and is disposed at or adjacent the first support side 12 / engagement side 23. Prefera-bly, the support member 22 is movable or rotatable relative to the second attach-ment element 35.

Referring briefly to Figs 2(a) and 2(b) and Fig. 3(a), the movable framework 21 preferably includes, at the engagement side 23, a planar second sub-framework 38. Further, for each support member 22, the second attachment element 35 is prefer-ably disposed on the second sub-framework 38. The second sub-framework 38 may be fixedly attached, in use, to the framework 9.

In an alternative embodiment, for each support member 22, the second attachment element 35 is disposed on the framework 9 at said first support side 12.

Returning to Fig. 3(a), for each support member 22, the first attachment element 34 preferably includes a first shear field 39 having a first bore 40 extending paral-lel to the plane of the first sub-framework 27. The first bore 40 is configured to receive a first axle element 41 passing through the first end 36 of the support member 22 and through the first shear field 39, whereby the support member 22 is rotatable about the first axle element 41. Preferably, the second attachment ele-ment 35 includes a second shear field 42 having a second bore 43 extending paral-lel to the plane of the first support side 12 respectively engagement side 23. The second bore 43 is configured to receive a second axle element 44 passing through the second end of the support member 22 and through the second shear field 42, whereby the support member 22 is rotatable about the second axle element 44. The first axle element 41 and/or the second axle element 44 may comprise a bolt or metal rod.

In embodiments, each first shear field 39 and each second shear field 42 (i) ex-tends parallel to the first axis of elongation A or the second axis of elongation (Figs 2(a) and 2(b)), (ii) lies in a plane that is aligned with a respective lateral edge 25, 26 (Figs 2(a) and 2(b)) of the second support side 24 or the engagement side 23, and/or (iii) lies in a plane that is orthogonal to the plane of the second support side 24 or the engagement side 23.

In one embodiment, the at least one first attachment element 34 and/or at least one second attachment element 35 includes a second bore 45, 46, respectively, extend-ing parallel to the first bore (40, 43) on that attachment element 34, 35. Preferably, each second bore 45, 46 is configured to receive a fixing element (not shown) when a respective support member 22 is in the second orientation and/or to fix the movable framework 21 in the second configuration.

Referring to Fig. 3(b), this is an enlarged lateral view of an attachment member 35 of Fig. 3(a). Preferably, for each first attachment element 34 and/or each second attachment element 35, a line joining the centres of the first bore 40 and the sec-ond bore 43 extends orthogonally to the second support side 24 and/or to the en-gagement side 23. In embodiments, the fixing element (e.g. a bolt or screw; not shown) passes, in use, through a respective third bore 47, 48 on the support mem-ber 22, and through the second bores 45, 46, in order to fix the support member 22 in the second orientation, corresponding to the second configuration of the mova-ble framework. (In Figs 3(a) and 3(b), the movable framework is between the first configuration and the second configuration.)

Figures 4(a) to 4(c) are lateral views of the framework arrangement 20 of Fig. 2(a) at various stages during the erection thereof, i.e. moving between the first configu-ration and the second configuration. Components described before which have the same function, will not be described again. As shown in Fig. 4(a), the framework arrangement 20 (including internal components 18) is transported on a trailer 49. It may be a requirement for such transport that a maximum vertical height of the framework arrangement 20 is lower than a maximum clearance indicated by dou-ble arrow C for such transport. Fig. 5(a) shows the framework arrangement 20 when the movable framework 21 is in the first configuration. In other words, at the first configuration the movable framework 21 is in a transportation position. Fig. 4(b) shows the framework arrangement 20 when the movable framework 21 is between the first configuration and the second configuration. Finally, Fig. 4(c) shows the framework arrangement 20 when the movable framework 21 is in the second configuration and the moveable framework 21 is complete erected. So the framework arrangement has reached the full height which is indicated by double arrow H. In other words, at the second configuration the movable framework is in operation position. At this position the crane 29 can be used for installing internal components (18) and/or installing the nacelle housing. Further depending on the operation to do at the operation position the framework arrangement can be mounted at the top of the tower and/or can be stay at the ground and/or trailer. In this way, the framework arrangement 20 can be transported to more desired loca-tions, while the movable framework 21 is in the first configuration, and then erected in situ. At the first configuration respectively the transportation position the transport high indicated by double arrow C is reduces, so the transportations costs are also reduced.

Figs 4(d) to 4(f) are lateral views showing relative positions of a support member 22 and attachment members 35 at each of the stages shown in Figs 4(a) to 4(c), respectively. Referring to Fig. 4(f), this shows the support member 22 fixed in the second orientation (and the movable framework 21 in the second configuration) using fixing element e.g. a bolt (not shown).

Figures 5(a) to 5(c) are lateral views of a framework arrangement 20I according to another embodiment of the invention at various stages during the erection thereof. Components described before which have the same function, will not be described again. This embodiment is the same as the first embodiment according to Figs 3a to 4(f) except as described otherwise hereafter. In this second embodiment, the movable framework 21I includes, at one or both ends thereof and aligned with a respective support beam or rail 28, a projection arm 51 configured for supporting, in use, the movable crane or crane hook, e.g. bridge crane 29. Consequently, the movable crane 29 may, in use, move (e.g. horizontally) over a projection distance P, in order to move or position components 18 or other items during installation or maintenance, and/or the crane hook can move vertically as indicated by double arrow D.

Figures 6(a) to 6(c) are lateral views of a framework arrangement 20II according to another embodiment of the invention at various stages during the erection thereof. Components described before which have the same function, will not be described again. This is the same as the first and second embodiment or subsequently de-scribed embodiments, except as described otherwise hereafter. In this third em-bodiment, the movable framework 21II is shorter along the second axis of elonga-tion B than is the framework 9 in the first axis of elongation A (see fig. 6(c)). Such an arrangement may be used when it is desirable or possible to transport the framework arrangement 20II (without internal components 18) with a transformer (not shown) already mounted on the framework 9.

Figures 7(a) to 7(c) are lateral views showing relative positions of support mem-bers and attachment members 35 at each of the stages shown in Figs 6(a) to 6(c), respectively according to a first variant. These are substantially the same as in Figs 2(a) to 2(c). Components described before which have the same function, will not be described again. Here, the movable framework 21 is foldable only for transport, and can be fixed in the second configuration using fixing element (not shown). It should be pointed out that the attachments members 35 can be used for each de-scribed embodiments of the framework arrangement 20 to 20V of the present in-vention.

Figures 7(d) to 7(f) are lateral views showing relative positions of support mem-bers and attachment members 35a at each of the stages shown in Figs 6(a) to 6(c), respectively according to a second variant. Components described before which have the same function, will not be described again. At the attachment members 35a, the bores 46 and 48 are omitted, and a single axle element 44 is used. This permits the movable framework 21 to be folded, while in situ, for servicing or maintenance purposes. In the latter case, the movable framework 21 may be held in the first configuration using alternative fixing or holding structures, such as hy-draulic members. It should be pointed out that the attachments members 35a can be used for each described embodiments of the framework arrangement 20 to 20V of the present invention.

Figures 8(a) to 8(c) are lateral views of a frame arrangement 20III according to an-other embodiment of the invention at various stages during the erection thereof, i.e. moving between the first configuration and the second configuration. Compo-nents described before which have the same function, will not be described again. This is the same as the embodiment of Figs 6(a) to 6(c) except as described other-wise hereafter. A part 53 of the nacelle roof may be fixed to the second support side 24 on the movable frame 21III. For example, the transformer (not shown), a top cover 54 of the nacelle and/or a side cover 55 of the nacelle may be stored in the framework 9 (e.g. at the end thereof opposite the rotor end) for transport. The frame arrangement 20III has been delivered to the site, as seen in Fig. 8(b). The transformer, the top cover 54 of the nacelle and/or the side cover 55 may be re-moved, and the transformer then installed on the framework 9. Finally the top cover 54 of the nacelle and/or the side cover 55 may be mounted on the moveable framework 21 as well as at the framework 9.

Figures 8(d) to 8(f) are lateral views showing relative positions of support mem-bers 22 and attachment members 35 at each of the stages shown in Figs 8(a) to 8(c), respectively. This is essentially the same as in Figs 7(a) to 7(c). Components described before which have the same function, will not be described again. How-ever, it may be implemented as indicated in Figs 7(d) to 7(f).

Figures 9(a) to 9(c) are lateral views of a framework arrangement 20IV according to another embodiment of the invention at various stages during the erection thereof, i.e. moving between the first configuration and the second configuration. Compo-nents described before which have the same function, will not be described again. This is the same as the previous embodiments except as described otherwise here-after. Fig. 9(a) shows the framework arrangement 20IV when the movable frame-work 21IV is in the first configuration. Fig. 9(b) shows the framework arrangement 20IV when the movable framework 21IV is between the first configuration and the second configuration. Finally, Fig. 9(c) shows the framework arrangement 20IV when the movable framework 21IV is in the second configuration.

As best seen in Figures 9(d) to 9(f), which are lateral views showing relative posi-tions of support members and attachment members at each of the stages shown in Figures 9(a) to 9(c). Components described before which have the same function, will not be described again. In this embodiment, the framework arrangement 20IV further includes a plurality of hydraulic members 56, and each hydraulic member is fixedly attached at one end 57, which is attached to a beam of the sub-framework 38, thereof at or adjacent the first support side 12 and at the other end 58 thereof to a respective support member 22. Preferably, the other end 58 is at-tached closer to the first end 36 of the support member than to the second end 37. In particular the hydraulic members 56 are arranged at opposite sides of the move-able framework 21IV.

In this embodiment, each hydraulic member 56 is configured to be driven in order to move a respective support member 22 from the first orientation to the second orientation and consequently to move the movable framework 21IV from the first configuration to the second configuration.

In this embodiment, the framework arrangement 20IV further includes a plurality of angle-beams 59. For each angle-beam 59, a third end 60 of the angle -beam 59 is configured to be rotatably attached via a respective first axle element 61 to a first attachment element (not shown) to which a first support member 22 is at-tached. Preferably, a fourth end 62 of the angle-beam 59, opposite the third end 60, is configured to be a free end when the movable framework 21IV is in the first configuration, enabling the angle-beams 59 to lie substantially flat (e.g. for transport). Preferably, the fourth end 62 is configured to be attached via a respec-tive second attachment element (not shown) to which a second support member 22, adjacent the first support member 22, is attached, when the movable frame-work 21IV is in the second configuration. The angle beams 59 forming shear fields for stabilization.

Fig. 9(g) is an enlarged partial view of a support member 22 and attachment mem-ber 35 of Fig. 9(f). As shown, this may be implemented as indicated in Figs 7(d) to 7(f); however, it may also be implemented as indicated in Figs 7(a) to 7(c). Components described before which have the same function, will not be described again.

Figures 10(a) and 10(b) are lateral views of a framework arrangement 20V accord-ing to another embodiment of the invention at various stages during the erection thereof. Components described before which have the same function, will not be described again. In this sixth embodiment, the moveable framework 21V is a roof elevation framework 63. A part of the roof 64 of the nacelle may be mounted on the second support side 24 of the roof elevation framework 63, e.g. on the first sub-framework 27. The roof elevation framework 63 may be fixedly attached to the first sub-framework 27 or the framework 9, and to at least a portion of a na-celle of the wind turbine. The roof elevation framework 63 may be movable (e.g. using hydraulic members 56, such as in the direction of double arrow L) between a third configuration, in which the at least a portion of a nacelle is adjacent and/or substantially aligned with the first sub-framework 27, the framework 9, or a re-mainder of the nacelle, and fourth configuration, in which the at least a portion of a nacelle is spaced apart from the first sub-framework 27 or the framework 9. For elevating the elevation framework 63 between the first sub-framework 27 and the second sub-framework 38 are arranged at least two a pair of crossed support members 22a. At latter at one support beam is mounted a hydraulic member 56 with one end 58 of the hydraulic member 56 and the opposite end 59 of the hy-draulic member 56 is attached to the second sub-framework 38.

A method mounting a framework arrangement 20-20V on, or maintaining compo-nents of, a wind turbine 2, may be described as follows. First, a framework ar-rangement 20-20V as set out hereinabove is manufactured or otherwise provided. Then, the framework arrangement 20-20V is transported to a site of/for the wind turbine 2 while the movable framework is in the first configuration. Next, the framework arrangement 20-20V is mounted on the wind turbine 2. Finally, the movable framework 21 is moved from the first configuration to the second con-figuration.

While at least one exemplary embodiment has been presented in the foregoing detailed description of the invention, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. Rather, the foregoing detailed description will provide those skilled in the art with a conven-ient road map for implementing an exemplary embodiment of the invention. It is to be understood that various changes may be made in the function and arrange-ment of elements described in an exemplary embodiment without departing from the scope of the invention as set forth in the appended claims