Method for manufacturing a wind turbine and wind turbine

Abstract

A method for manufacturing a wind turbine (1), the method comprising the steps of: a) manufacturing (S1) a bottom module (24), the bottom module (24) comprising at least one first platform (27, 28); b) manufacturing (S2) a top module (25), the top module (25) comprising at least one second platform (30); and c) assembling (S3) the bottom module (24) and the top module (25) to form a platform assembly (22). Manufacturing the platform assembly from two separate modules allows for the manufacture of a higher platform assembly.

Description

Field of the Invention

[0001] The present invention relates to a method for manufacturing a wind turbine and a wind turbine. Background Art

[0002] The size of wind turbines is increasing. This also involves an increase in the size of the individual components of the wind turbine. For example, the size of the transition piece that connects the foundation of the wind turbine to the tower of the wind turbine is increasing.

[0003] The transition piece includes several platforms inside. These platforms can be inserted into the transition piece in two different ways.

[0004] According to the first method, the transition piece is arranged horizontally, and these platforms are inserted into the horizontal transition piece one by one and connected to the tower wall of the transition piece one by one. This method is time-consuming and costly.

[0005] According to the second method, the platforms of the transition piece are assembled to form a platform assembly. The platform assembly is inserted into the transition piece, for example, by means of a crane, and suspended on the tower wall. This method reduces the number of connection points with the tower wall, thus saving time and cost. However, for very high transition pieces, the height of the platform assembly for the transition piece is also increasing. For example, due to the limited height of the factory building, it may be difficult to manufacture and transport very high platform assemblies. Summary of the Invention

[0006] An object of the present invention is to provide an improved method for manufacturing a wind turbine and an improved wind turbine.

[0007] Therefore, a method for manufacturing a wind turbine is proposed. The method includes the following steps:

[0008] a) manufacturing a bottom module, the bottom module including at least one first platform,

[0009] b) manufacturing a top module, the top module including at least one second platform, and

[0010] c) assembling the bottom module and the top module to form a platform assembly.

[0011] Manufacturing the platform assembly from two separate modules allows for the manufacture of higher platform assemblies. In particular, platform assemblies suitable for higher transition pieces can be manufactured.

[0012] By means of the above method, the platform assembly can be freely suspended on the wall portion of the tower or the transition piece. Thereby, the installation work can be reduced. In particular, the expensive individual installation of separate platforms onto the transition piece wall is avoided. In addition, reducing the number of connection points with the transition piece wall reduces the risk of transition piece fatigue.

[0013] In particular, step a) of manufacturing the bottom module with the at least one first platform is carried out inside a factory building. Furthermore, step b) of manufacturing the top module with the at least one second platform is also carried out, for example, inside a factory building. Step c) of assembling the bottom module and the top module to form a platform assembly is carried out, for example, outside a factory building. This allows for the manufacture of a platform assembly having a height greater than the maximum height of the factory building.

[0014] A wind turbine is a device that converts the kinetic energy of the wind into electrical energy. For example, a wind turbine includes: a rotor having one or more blades; a nacelle including a generator; and a tower that holds the nacelle at its top. The tower of the wind turbine can be connected to the foundation of the wind turbine, such as a monopile in the seabed, via a transition piece.

[0015] The tower and the transition piece of the wind turbine include two or more platforms inside them, such as the first platform and the second platform. These platforms can be configured to carry electrical or mechanical devices required for the operation of the wind turbine, such as low-voltage transformers and switching devices. These platforms can also be configured as working platforms, for example, for performing work during the assembly of the wind turbine and / or maintenance work during the operation of the wind turbine. An example of a working platform is a bolt platform, which is used to bolt tower sections to each other or to the transition piece.

[0016] The at least one first platform of the bottom module particularly includes one, two, three, or more platforms. For example, the at least one first platform of the bottom module includes a switching device platform and / or a suspension platform. The switching device platform is particularly a platform on which the switching device is arranged. The suspension platform is, for example, a working platform for the installation of cables that connect the wind turbine to other wind turbines in a wind turbine array.

[0017] The at least one second platform of the top module particularly includes one, two, three, or more platforms. For example, the at least one second platform of the top module includes a bolt platform, which is configured for workers to bolt the transition piece to the tower, particularly to the bottom tower section.

[0018] According to one embodiment, the top module includes: two or more vertical legs; a first horizontal plane at which the two or more vertical legs are horizontally connected; and a second horizontal plane at which the two or more vertical legs are horizontally connected. The first horizontal plane is spaced apart from the second horizontal plane in the vertical direction. The first horizontal plane or the second horizontal plane includes the at least one second platform, which provides the horizontal connection of the two or more vertical legs.

[0019] Each of the two or more vertical legs of the top module is in particular continuous, i.e., formed as a single piece.

[0020] Each of the two or more vertical legs of the top module includes, for example, at its upper part, connecting means for connection to a wall part of a transition piece, such as a flange.

[0021] The two or more vertical legs of the top module are horizontally connected at a first horizontal plane such that the two or more vertical legs are stabilized at the first horizontal plane. Similarly, the two or more vertical legs of the top module are horizontally connected at a second horizontal plane such that the two or more vertical legs are stabilized at the second horizontal plane.

[0022] By having the horizontal connection of the two or more vertical legs at the first and second horizontal planes, the top module can be manufactured such that it is self-standing. In addition, it can be easily transported to the location where it is assembled with the bottom module.

[0023] The first horizontal plane is spaced apart from the second horizontal plane in the vertical direction, in particular by a first height. The first height is large enough to have the height of a stable self-standing top module. The first height is, for example, greater than two meters, greater than five meters, and / or greater than ten meters.

[0024] The two or more vertical legs of the top module are connected, for example, in the second horizontal plane by a second platform, in particular a bolt platform of a transition piece. The second horizontal plane of the top module is, for example, arranged above the first horizontal plane of the top module.

[0025] According to another embodiment, the other of the first and second horizontal planes of the top module includes a plurality of horizontal struts that provide the horizontal connection of the two or more vertical legs.

[0026] The plurality of struts is made of, for example, metal, in particular steel.

[0027] By having the horizontal connection of the two or more vertical legs at one of the first and second horizontal planes by means of the plurality of struts, a top module including only a single platform can be manufactured as a self-standing module.

[0028] In an alternative embodiment of the top module, the top module includes at least two second platforms arranged at the first and second horizontal planes, respectively. In other words, the top module includes platforms at both the first and second horizontal planes instead of struts at one of the first and second horizontal planes.

[0029] According to another embodiment, the bottom module includes: at least two first platforms; two or more vertical legs; a first horizontal plane at which the two or more vertical legs are horizontally connected; and a second horizontal plane at which the two or more vertical legs are horizontally connected. The first horizontal plane is vertically spaced from the second horizontal plane. Each of the first horizontal plane and the second horizontal plane includes one of the at least two first platforms, and each of the at least two first platforms provides a horizontal connection for the two or more vertical legs.

[0030] Each of the two or more vertical legs of the bottom module is particularly continuous, i.e., formed as a single piece.

[0031] The two or more vertical legs of the bottom module are horizontally connected at the first horizontal plane such that the two or more vertical legs are stabilized at the first horizontal plane. Similarly, the two or more vertical legs of the bottom module are horizontally connected at the second horizontal plane such that the two or more vertical legs are stabilized at the second horizontal plane.

[0032] By having the horizontal connections of the two or more vertical legs at the first and second horizontal planes, the bottom module can be manufactured such that it is self-standing. In addition, it can be easily transported to the location where it is assembled with the top module.

[0033] The first horizontal plane of the bottom module is vertically spaced from the second horizontal plane of the bottom module, particularly at a second height. The second height is large enough to have the height of a stable self-standing bottom module. The second height is, for example, greater than two meters, greater than five meters, and / or greater than ten meters.

[0034] For the bottom module, the horizontal connections of the two or more vertical legs are provided by one of the at least two first platforms in both the first horizontal plane and the second horizontal plane. For example, the horizontal connection of the two or more vertical legs of the bottom module in the first horizontal plane is provided by a suspension platform. In addition, the horizontal connection of the two or more vertical legs of the bottom module in the second horizontal plane is provided by a switch device platform. The second horizontal plane of the bottom module is, for example, arranged above the first horizontal plane of the bottom module.

[0035] In an alternative embodiment of the bottom module, one of the first horizontal plane and the second horizontal plane of the bottom module includes a plurality of horizontal struts instead of the first platform, and the plurality of horizontal struts provide the horizontal connection for the two or more vertical legs.

[0036] According to another embodiment, the bottom module and the top module are assembled by aligning and connecting the bottom module with the top module, particularly by aligning and connecting two or more vertical legs of the bottom module with two or more vertical legs of the top module.

[0037] The bottom module and the top module are assembled, for example, outside the factory building where they are manufactured and / or at a port location.

[0038] For assembly, the bottom part of each of the two or more vertical legs of the top module is aligned, for example, with the corresponding top part of each of the two or more vertical legs of the bottom module. The bottom module and the top module are connected to each other, in particular by means of connecting means.

[0039] According to another embodiment, the bottom module is aligned with the top module by means of a back plate connected to the two or more vertical legs of the bottom module and / or the two or more vertical legs of the top module.

[0040] Having these back plates allows for a more precise alignment of the bottom module and the top module.

[0041] According to another embodiment, the method comprises the step of inserting the platform assembly into the transition piece of the wind turbine, in particular by means of a crane. The transition piece is configured for connection to the foundation of the wind turbine.

[0042] According to another embodiment, the method comprises the step of connecting the platform assembly to a wall part of the transition piece, in particular a flange, in order to suspend the platform assembly from the wall part.

[0043] For example, the platform assembly is suspended from the flange such that it hangs freely from the flange. In particular, the platform assembly is not connected to any additional wall part of the transition piece other than the flange.

[0044] For example, the top part of each of the two or more vertical legs of the top module of the platform assembly is connected to the flange of the transition piece. Alternatively, separate struts and / or arms can also be used to connect the platform assembly to the flange. For example, separate struts can connect the topmost platform of the platform assembly, for example the second platform, to the flange.

[0045] By connecting the platform assembly to the transition piece wall part and suspending the platform assembly from the wall part, several or all of the platforms required in the transition piece can be connected to the transition piece in one step without connecting each individual platform to the transition piece wall part.

[0046] According to another embodiment, the at least one first platform and / or the at least one second platform comprises one or more pivotable edge elements. Furthermore, the method comprises the step of pivoting the one or more pivotable edge elements in order to bridge the gap between the at least one first platform and / or the at least one second platform and an adjacent wall part.

[0047] The platform component is inserted into the transition piece after assembly. This requires that the diameter of the platform component, in particular the diameter of the at least one first platform and the at least one second platform, be small enough to fit through the narrowest part of the transition piece. The narrowest part of the transition piece is, for example, at the flange of the transition piece. Thus, in the inserted state, there is a gap between each of the at least one first platform and the at least one second platform and the corresponding adjacent inner wall part of the transition piece.

[0048] Having the one or more pivotable edge elements and pivoting them to bridge the gap between the at least one first platform and / or the at least one second platform and the adjacent wall part allows for an increase in the functionality and safety of the wind turbine. In particular, it allows for preventing objects such as devices from falling through the gap.

[0049] According to another embodiment, each of the one or more pivotable edge elements is connected to the body of the at least one first platform and / or the at least one second platform.

[0050] The one or more pivotable edge elements are connected to the body of the at least one first platform and / or the at least one second platform, in particular by means of bolts, such that the pivotable edge elements pivot about the bolts.

[0051] According to another embodiment, the method includes the following steps: transporting the transition piece including the platform component produced according to steps a) to c) to the wind collection site, in particular by means of a ship.

[0052] Thus, when transporting the transition piece to the wind collection site, in particular in a vertical position, the platform component can be installed inside the transition piece, which is, for example, an "extra-long transition piece" having a height of 40 meters or more.

[0053] According to another aspect, a wind turbine is provided. The wind turbine includes a platform component. The platform component includes a bottom module having at least one first platform and a top module having at least one second platform.

[0054] According to an embodiment of this other aspect, the top module includes: two or more vertical legs; a first horizontal plane at which the two or more vertical legs are horizontally connected; and a second horizontal plane at which the two or more vertical legs are horizontally connected. The first horizontal plane is vertically spaced from the second horizontal plane. The first horizontal plane or the second horizontal plane includes the at least one second platform, which provides the horizontal connection of the two or more vertical legs.

[0055] According to another embodiment of this other aspect, another one of the first horizontal plane and the second horizontal plane of the top module includes a plurality of horizontal struts that provide horizontal connection of the two or more vertical legs.

[0056] According to another embodiment of this other aspect, the bottom module includes: at least two first platforms; two or more vertical legs; a first horizontal plane at which the two or more vertical legs are horizontally connected; and a second horizontal plane at which the two or more vertical legs are horizontally connected. The first horizontal plane is vertically spaced from the second horizontal plane. Each of the first horizontal plane and the second horizontal plane includes one of the at least two first platforms, and each of the at least two first platforms provides horizontal connection of the two or more vertical legs.

[0057] The embodiments and features described with reference to the method of the present invention are also applicable to the wind turbine of the present invention with necessary modifications.

[0058] Other possible embodiments or alternatives of the present invention also cover combinations of features not explicitly mentioned herein that are described above or below with respect to the embodiments. Those skilled in the art can also add individual or isolated aspects and features to the most basic form of the present invention. Description of the Drawings

[0059] In conjunction with the accompanying drawings, other embodiments, features, and advantages of the present invention will become apparent from the following description and the dependent claims, in which:

[0060] Figure 1 A wind turbine according to an embodiment is shown in a partial cross-sectional view;

[0061] Figure 2 is shown Figure 1 a perspective view of the platform assembly of the wind turbine of;

[0062] Figure 3 illustrates the process steps for manufacturing Figure 2 each platform of the platform assembly of;

[0063] Figure 4 illustrates the process steps for manufacturing Figure 2 the bottom module of the platform assembly of;

[0064] Figure 5 illustrates the process steps for manufacturing Figure 2 the top module of the platform assembly of;

[0065] Figure 6 illustrates the process steps for assembling Figure 4 the bottom module of and Figure 5 the top module of to formFigure 2 Process steps of the platform component;

[0066] Figure 7 Illustrates the process steps for inserting the Figure 2 platform component of into the Figure 1 transition piece of a wind turbine;

[0067] Figure 8 Shows Figure 2 a detailed view of the bolt platform of the platform component, the bolt platform having a pivotable edge element;

[0068] Figure 9 Shows in a sectional view Figure 8 an enlarged partial view of;

[0069] Figure 10 Shows Figure 8 a view similar to, but in which the pivotable edge element is pivoted outwards;

[0070] Figure 11 Shows in a sectional view Figure 10 an enlarged partial view of; and

[0071] Figure 12 Shows a flowchart that illustrates a method for manufacturing a wind turbine according to an embodiment.

[0072] In the drawings, unless otherwise indicated, the same reference numerals denote the same or functionally equivalent elements. Detailed Description

[0073] Figure 1 Shows an offshore wind turbine 1 according to an embodiment.

[0074] The wind turbine 1 includes a rotor 2, which is connected to a generator (not shown) arranged in a nacelle 3. The nacelle 3 is arranged at the upper end of a tower 4 of the wind turbine 1. The tower 4 is arranged on a transition piece 5. The transition piece 5 is a "super elongated transition piece" having a height of 40 meters or more. The transition piece 5 stands on a monopile 6, which is driven into the seabed 7 and is partially above the water level of the sea water 8.

[0075] The rotor 2 includes, for example, three rotor blades 9. The rotor blades 9 are connected to a hub 10 of the wind turbine 1. A shaft (not shown) connects the hub 10 to the generator.

[0076] The generator is electrically connected to a switching device 11 in the transition piece 5 by means of a high-voltage cable (not shown).

[0077] The tower 4 includes one or more tower sections 12, 13, 14. In Figure 1In the example, the tower 4 includes a bottom tower section 12, a middle tower section 13, and a top tower section 14. Each of the tower sections 12, 13, 14 includes one or more flanges 15, which are bolted to the corresponding flanges 15 of another tower section 12, 13, 14. In addition, the bottom tower section 12 of the tower 4 includes a flange 16 that is bolted to the transition piece 5.

[0078] The tower 4 includes one or more platforms 17, 18, 19, 20 inside. For example, the tower 4 includes a low-voltage platform 17 in the bottom tower section 12, and a low-voltage transformer (not shown) is located on the low-voltage platform 17. The tower 4 may also include bolt platforms 18 and 19, which are configured for workers to bolt the corresponding tower sections 12, 13, 14 to each other when assembling the tower 4.

[0079] The transition piece 5 includes a landing platform 21 on its outer side to provide access to the inside of the transition piece 5 and the tower 4. The transition piece 5 also includes a platform assembly 22, which is suspended from the flange 23 of the transition piece 5. The flange 23 of the transition piece 5 is bolted to the flange 16 of the tower 4.

[0080] The platform assembly 22 includes a bottom module 24 and a top module 25. The bottom module 24 and the top module 25 are connected to each other by a connecting device 26. Figure 2 is shown Figure 1 an enlarged perspective view of the platform assembly 22.

[0081] The bottom module 24 includes at least one first platform 27, 28. In Figure 1 and Figure 2 the example, the bottom module 24 includes a hang-off platform 27 and a switchgear platform 28, and the switchgear 11 is arranged on the switchgear platform 28. In addition, the bottom module 24 may include a switchgear walkway 29 above the switchgear platform 28.

[0082] The top module 25 includes at least one second platform 30. In Figure 1 and Figure 2 the example, the top module 25 includes a bolt platform 30 for workers to connect the transition piece 5 and the tower 4 by bolting the flanges 16 and 23 to each other. In addition, the top module 25 includes two or more vertical legs 31 and a plurality of struts 32 connecting the two or more vertical legs 31.

[0083] As in Figure 2As can be seen, the top module 25 includes, for example, six vertical legs 31. In addition, the top module 25 includes a first horizontal plane 33 at which the six vertical legs 31 are horizontally connected by means of the plurality of horizontal struts 32. In addition, the top module 25 includes a second horizontal plane 34 at which the six vertical legs 31 are horizontally connected by means of the bolt platform 30. The first horizontal plane 33 is spaced apart from the second horizontal plane 34 in the vertical direction Z by a first height H1. The first height H1 is, for example, greater than two meters, greater than five meters, and / or greater than ten meters.

[0084] The bottom module 24 includes six vertical legs 35. In addition, the bottom module 24 includes a first horizontal plane 36 at which the six vertical legs 35 are horizontally connected by means of the suspension platform 27. In addition, the bottom module 24 includes a second horizontal plane 37 at which the six vertical legs 35 are horizontally connected by means of the switchgear platform 28. The first horizontal plane 36 is spaced apart from the second horizontal plane 37 in the vertical direction Z by a second height H2. The second height H2 is, for example, greater than two meters, greater than five meters, and / or greater than ten meters.

[0085] Hereinafter, a method for manufacturing Figure 3 - 12 the wind turbine 1 Figure 1 will be described.

[0086] In step S1 of the method, the bottom module 24 is manufactured. Figure 3 Illustrated is the manufacture of the respective platforms 27, 28, 30 of the bottom module 24 and the top module 25 at separate fixtures (supports) 38 within a factory building. Figure 4 Illustrated is the manufacture of the bottom module 24 at a fixture (support) 39 within a factory building. The suspension platform 27 and the switchgear platform 28 are each arranged on the horizontal part of the fixture 39 so as to extend horizontally. Then, the six vertical legs 35 are connected to the suspension platform 27. In addition, the six legs 35 are connected to the switchgear platform 28.

[0087] In step S2 of the method, the top module 25 is manufactured at a fixture (support) 40 within a factory building, as Figure 5 shown. The bolt platform 30 is placed on the horizontal part of the fixture 40. Then, the six legs 31 are provided and horizontally connected at the second horizontal plane 34 including the bolt platform 30. Further, the six legs 31 are horizontally connected at the first horizontal plane 33 by means of the plurality of struts 32.

[0088] Both the bottom module 24 and the top module 25 are self-supporting in that they each have two spaced-apart horizontal connections of their legs 31, 35.

[0089] In step S3 of the method, the bottom module 24 and the top module 25 are assembled to form the platform assembly 22, as Figure 6 shown. The bottom module 24 and the top module 25 are transported outside the factory building. The top module 25 is lifted above the bottom module 24 by a crane 41. Each of the vertical legs 31 of the top module 25 includes a back plate 42. The top module 25 is aligned with the bottom module 24 by means of the back plate 42. The bottom module 24 and the top module 25 are connected to each other by means of a connecting device 26. For example, the back plate 42 can be used as the connecting device 26. The alignment and connection of the modules 24, 25 can be supported by workers standing on the platform of the scaffolding 43.

[0090] In step S4 of the method, the platform assembly 22 is inserted into the transition piece 5 of the wind turbine 1 by means of the crane 41. As Figure 7 shown, the platform assembly 22 is lifted by the crane 41 and inserted into the vertical transition piece 5 from above.

[0091] In step S5 of the method, the platform assembly 22 is connected to the flange 23 of the transition piece 5 to suspend the platform assembly 22 on the flange 23.

[0092] In particular, the arm 44 of the top module 25 ( Figure 2 ) is connected to the flange 23 by means of bolts, for example. Thus, in this example, the platform assembly 22 is supported by the flange 23 at six connection points. From these six connection points, the platform assembly 22 is freely suspended in the transition piece 5, that is, no other connection provides support in the vertical direction Z.

[0093] In step S6 of the method, the pivotable edge element 45 of the bolt platform 30 is pivoted to bridge the gap 46 between the bolt platform 30 and the adjacent wall portion 47, as Figures 9 to 11 shown.

[0094] Figure 8 The bolt platform 30, which is part of the platform assembly 22, is shown. The bolt platform 30 includes a main body 48 and a pivotable edge element 45. In addition, there is a gap 46 between the main body 48 of the bolt platform 30 and the adjacent wall portion 47 because the diameter of the main body 48 of the bolt platform 30 is smaller than the inner diameter of the transition piece 5, especially at the adjacent wall portion 47. In order to prevent objects from falling through the gap 46 from the bolt platform 30, the gap 46 is (partially) closed in this method by pivoting the pivotable edge element 45.

[0095] Figure 9 An enlarged cross-sectional view of a part of the bolt platform 30 is shown. The pivotable edge element 45 is connected to the main body 48 of the bolt platform 30 by means of bolts 49.

[0096] To bridge the gap 46, the pivotable edge element 45 can be pivoted outwards, as Figure 10 in and as Figure 11 shown in the enlarged cross-sectional view. The pivotable edge element 45 is pivoted outwards by pivoting them about the bolts 49.

[0097] Although the invention has been described in terms of the preferred embodiments, it will be apparent to those skilled in the art that modifications are possible in all embodiments.

Claims

1. A method for manufacturing a wind turbine (1), the method comprising the steps of: a) manufacturing (S1) a bottom module (24), the bottom module (24) comprising at least one first platform (27, 28) and two or more vertical legs connected together by a first horizontal connection and positioned radially outside the at least one first platform, b) manufacturing (S2) a top module (25) separately from the manufacturing of the bottom module, the top module (25) comprising at least one second platform (30) and two or more vertical legs connected together by a second horizontal connection, and c) assembling (S3) the bottom module (24) and the top module (25) to form the platform assembly (22) before the platform assembly (22) is inserted into a transition piece (5) of the wind turbine (1), wherein the two or more vertical legs of the top module are separate from the two or more vertical legs of the bottom module, wherein the bottom module and the top module are aligned and connected by aligning and connecting the two or more vertical legs of the bottom module with the two or more vertical legs of the top module radially outside the at least one first platform of the bottom module, and wherein the top module comprises a plurality of horizontal struts that connect the two or more vertical legs of the top module together, the two or more vertical legs of the top module and / or the two or more vertical legs of the bottom module are connected to a back plate, and wherein the two or more vertical legs of the top module use the back plate to be aligned and connected to the two or more vertical legs of the bottom module.

2. The method according to claim 1, wherein: the top module (25) comprises: a first horizontal plane (33) at which the two or more vertical legs (31) are horizontally connected; and a second horizontal plane (34) at which the two or more vertical legs (31) are horizontally connected, the first horizontal plane (33) being vertically spaced from the second horizontal plane (34) in the vertical direction (Z), and the first horizontal plane (33) or the second horizontal plane (34) comprises the at least one second platform (30) that provides the horizontal connection of the two or more vertical legs (31).

3. The method according to claim 2, wherein, The plurality of horizontal struts are located at the first horizontal plane (33) of the top module (25).

4. The method according to any one of claims 1 to 3, wherein: The bottom module (24) includes: at least two first platforms (27, 28); a first horizontal plane (36) at which the two or more vertical legs (35) are horizontally connected; and a second horizontal plane (37) at which the two or more vertical legs (35) are horizontally connected, the first horizontal plane (36) being vertically spaced from the second horizontal plane (37) in the vertical direction (Z), and each of the first horizontal plane (36) and the second horizontal plane (37) includes one of the at least two first platforms (27, 28), and each of the at least two first platforms (27, 28) provides a horizontal connection for the two or more vertical legs (35).

5. The method according to any one of claims 1 to 3, comprising the following steps: Insert (S4) the platform assembly (22) into the transition piece (5) of the wind turbine (1), the transition piece (5) being configured to be connected to the foundation (6) of the wind turbine (1).

6. The method according to claim 5, wherein The step of inserting the platform assembly (22) into the transition piece (5) of the wind turbine (1) includes: inserting the platform assembly (22) into the transition piece (5) by means of a crane (41).

7. The method according to claim 5, comprising the step of connecting (S5) the platform assembly (22) to a wall portion of the transition piece (5) to suspend the platform assembly (22) on the wall portion.

8. The method according to claim 7, wherein, The step of connecting the platform assembly (22) to the wall portion of the transition piece (5) includes: connecting the platform assembly (22) to a flange (23) of the transition piece (5).

9. The method according to any one of claims 1 to 3, wherein The at least one first platform (27, 28) and / or the at least one second platform (30) includes one or more pivotable edge elements (45), and wherein the method includes the step of pivoting (S6) the one or more pivotable edge elements (45) so as to bridge a gap (46) between the at least one first platform (27, 28) and / or the at least one second platform (30) and an adjacent wall portion (47).

10. The method according to claim 9, wherein, Each of the one or more pivotable edge elements (45) is connected to a body (48) of the at least one first platform (27, 28) and / or the at least one second platform (30).

11. The method according to claim 5, comprising the following steps: Transport (S7) the transition piece (5) including the platform assembly (22) produced according to steps a) to c) to a wind collection site.

12. The method according to claim 11, wherein, The step of transporting the transition piece (5) including the platform assembly (22) produced according to steps a) to c) to a wind collection site includes: transporting the transition piece (5) including the platform assembly (22) produced according to steps a) to c) to a wind collection site by means of a ship.

13. A wind turbine (1) comprising a platform assembly (22), said platform assembly (22) comprising a bottom module (24) and a top module (25), said bottom module (24) having at least one first platform (27, 28) and two or more vertical legs connected together by a first horizontal connection and positioned radially outside of said at least one first platform, said top module (25) having at least one second platform (30) and two or more vertical legs connected together by a second horizontal connection, wherein, The bottom module and the top module are separately manufactured modules, Wherein, the bottom module and the top module are assembled by aligning and connecting the two or more vertical legs of the bottom module with the two or more vertical legs of the top module radially outside the at least one first platform of the bottom module, and wherein, the top module includes a plurality of horizontal struts that connect the two or more vertical legs of the top module together, the two or more vertical legs of the top module and / or the two or more vertical legs of the bottom module are connected to a back plate, and wherein, the two or more vertical legs of the top module are aligned and connected to the two or more vertical legs of the bottom module using the back plate.

14. The wind turbine (1) according to claim 13, wherein: The top module (25) includes: a first horizontal plane (33) at which the two or more vertical legs (31) are horizontally connected; and a second horizontal plane (34) at which the two or more vertical legs (31) are horizontally connected, the first horizontal plane (33) being spaced apart from the second horizontal plane (34) in the vertical direction (Z), and The first horizontal plane (33) or the second horizontal plane (34) includes the at least one second platform (30) that provides the horizontal connection of the two or more vertical legs (31).

15. The wind turbine (1) according to claim 14, wherein, The plurality of horizontal struts are located at the first horizontal plane (33) of the top module (25).

16. The wind turbine (1) according to any one of claims 13 to 15, wherein: The bottom module (24) includes: at least two first platforms (27, 28); a first horizontal plane (36) at which the two or more vertical legs (35) are horizontally connected; and a second horizontal plane (37) at which the two or more vertical legs (35) are horizontally connected, the first horizontal plane (36) being spaced apart from the second horizontal plane (37) in the vertical direction (Z), and Each of the first horizontal plane (36) and the second horizontal plane (37) includes one of the at least two first platforms (27, 28), and each of the at least two first platforms (27, 28) provides the horizontal connection of the two or more vertical legs (35).

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