Concrete section of wind turbine tower section, kit of concrete section and heating device, concrete section, wind turbine, mould and method of assembling wind turbine

Abstract

The invention may be included in the technical field of concrete sections for wind turbine towers and more particularly for wind turbine towers in cold climates with ambient temperatures below 5 DEG C. The invention relates to a kit of concrete sections and heating devices, a concrete section, a wind turbine, a mould and a method of assembling a wind turbine.

Description

Technical Field

[0001] The present invention may be included in the technical field of concrete sections for wind turbine towers and more particularly for wind turbine towers in cold climates with ambient temperatures below 5°C. The present invention relates to a kit of concrete sections and a heating device, a concrete section, a wind turbine, a mould and a method of assembling a wind turbine. Background Art

[0002] The goal of wind energy is to generate electricity from the wind using wind turbines with the greatest possible efficiency and at the lowest cost. Said wind turbines basically consist of a tower, a nacelle containing a generator and a rotor comprising at least two blades.

[0003] The tower supports all elements incorporated in the nacelle and transfers all reaction forces generated due to the different aerodynamic effects and operating conditions of the wind turbine to the foundation.

[0004] Typically, given the size of the wind turbine and therefore the size of the tower, the tower is manufactured using modular sections of reinforced concrete called precast segments. In order to join these precast segments, filler material must be used, which can consist of a mortar (also called mortar) or resin deposited therein.

[0005] From now on, the invention will be explained with reference to the use of mortar as filler, although, as mentioned, it may be a resin or another material.

[0006] During the assembly of concrete towers at low temperatures, before pouring the mortar, it is necessary to ensure minimum temperature conditions (at least 5°C) both for the precast sections and for the mortar, including the temperature of the mortar poured into the vertical and horizontal joints, to ensure sufficient curing so that the mortar can develop all its mechanical properties (resistance).

[0007] When these components are manufactured at cryogenic temperatures, where the temperature can drop to -20°C, to ensure correct structural performance of the tower it is necessary to have a heating system that allows the temperature in both the precast sections and the mortar poured into the joints to be maintained above 5°C.

[0008] Pouring mortar at ambient temperatures below 0°C is always a rather demanding factor. This is due to the reality that concrete requires a certain temperature for the cement to hydrate and acquire resistance. In addition, because it contains water, when it starts to solidify, the free-flowing water freezes, increasing its volume, with the attendant risk of cracking.

[0009] In the case of concrete tower assembly at low temperatures, the volume of the mortar is insufficient to ensure that the water does not freeze, since it is completely surrounded by the larger mass of precast concrete at ambient temperature.

[0010] Under low temperature conditions (below 5°C), in addition to ensuring the mechanical properties of the mortar, it is also necessary to ensure perfect filling of the joints between the precast sections that make up the tower.

[0011] To this end, in the case of vertical joints, it must be possible to pump said mortar to a height of 20 m and not to segregate when pouring in free fall from a height of 20 m. The constraints are even greater for horizontal joints, since in this case the pouring of the mortar must be guaranteed at a height of more than 100 m. According to their technical data sheets, all mortars require a temperature of at least +5°C in the supports (in the case of towers for wind turbines, these are precast sections) to guarantee correct curing. Below 5°C, the manufacturer does not guarantee the necessary minimum resistance.

[0012] Traditionally, in the closest prior art, foundations are made at -20°C using concrete with a high cement content so that it has a high heat of hydration and heats up quickly enough to avoid freezing. Usually, the footings are covered with a thermal blanket so as not to lose too much heat and in this way keep the temperature at the desired value.

[0013] The problem with using thermal blankets is that they need to adhere well to the surface to be heated. If the blanket does not adhere well, heating of the surface is slow and uneven.

[0014] Another possibility of heating consists in using fans with electrical resistances directed towards the joint (cylindrical ducts with directional air outlet nozzles). Some of the problems arising from this solution are that a large number of fans are required, so that a large number of generators are required to supply energy to the fans, and the need to guarantee a certain degree of continuous system operation, since stopping will result in a rapid loss of the thermal conditions previously generated.

[0015] Other alternatives considered in preheating are the use of infrared lamps. As far as heating is concerned, market solutions have not achieved effective results.

[0016] The current technology used for pouring mortars has four significant disadvantages, one of which highlights the problem of cracking due to freezing of the water present, quality problems in the formation of joints, filling problems (especially in horizontal joints at heights far from the ground), problems with the resistance capacity of the mortar when the temperatures reached are lower than 5°C, assembly problems related to time and the devices adopted (pumping difficulties, heating of the medium near the mortar deposition, etc.), and the need to use special mortars with a high cement content, which increases the cost of the tower.

[0017] Heating systems known in the art and designed to thermally condition materials in order to solve the above-mentioned problems present high consumption due to low thermal efficiency. Summary of the invention

[0018] The present invention discloses a concrete section of a wind turbine tower, wherein the concrete section comprises an inner surface, an outer surface and at least one connecting flange, the at least one connecting flange being configured to establish a boundary for producing at least one joint between the concrete section and an adjacent concrete section, the at least one connecting flange comprising a connecting surface, wherein the concrete section comprises at least one recess arranged in the connecting surface of the at least one connecting flange, the at least one recess being configured to at least partially distribute or position a heating device in use.

[0019] The heating device thus ensures curing of the joint in sub-zero ambient conditions.

[0020] Optionally, the concrete segment comprises at least two connecting flanges, in particular at least an upper flange and a lower flange, wherein each of the at least two connecting flanges comprises a connecting surface.

[0021] Optionally, at least one recess is at least partially arranged substantially parallel to the inner surface and / or the outer surface.

[0022] Optionally, at least one connecting flange comprises at least two recesses, the at least two recesses being at least one outer recess and one inner recess, wherein a first radial distance from the inner recess to the inner surface is smaller than a second radial distance from the outer recess to the outer surface.

[0023] Optionally, at least one connecting flange comprises a single recess comprising an inner branch and an outer branch, wherein a first radial distance from the inner branch to the inner surface is smaller than a second radial distance from the outer branch to the outer surface.

[0024] Optionally, the at least one recess comprises at least one end portion configured to connect the at least one recess to at least one connecting surface of the concrete section.

[0025] Optionally, at least one end portion is configured to connect at least one recess with the inner surface and / or the outer surface.

[0026] Preferably, at least one end is inclined or perpendicular to the inner surface and / or the outer surface.

[0027] Optionally, at least one end portion is configured to connect at least one recess with a connecting surface of a transverse flange.

[0028] Optionally, the concrete section comprises at least one recess provided in the upper flange and at least one recess provided in the lower flange.

[0029] Optionally, the at least one recess comprises a first depth, wherein, in use, the first depth is greater than a height of a heating device at least partially dispensed in the at least one recess, whereby preferably the heating device once dispensed is fully embedded in the at least one recess.

[0030] Optionally, the connecting surface comprises a length, wherein the at least one recess is evenly distributed along substantially the entire length of the connecting surface, preferably evenly distributed along the entire length.

[0031] Optionally, the connecting surface comprises a width, wherein the at least one recess is unevenly distributed along the width of the connecting surface.

[0032] Optionally, at least one recess is a continuous recess, preferably forming a ring.

[0033] Optionally, at least one recess is provided in an unreinforced concrete region of the concrete segment.

[0034] Optionally, the heating device comprises at least a heating cable.

[0035] Optionally, at least one recess is configured to at least partially distribute a single heating cable arranged in parallel or a plurality of heating cables arranged in parallel.

[0036] Optionally, the at least one recess provided in the connecting surface is at least one recess provided in the connecting surface of an upper flange, a lower flange or a transverse flange of the concrete section, i.e. at least one recess provided in the horizontal joint for the two first connecting surfaces and in the vertical joint for the last connecting surface.

[0037] The concrete sections constructed in this way present the following advantages:

[0038] - The heating devices are closer to the mortar of the joints than when they are embedded in precast concrete

[0039] - Easy to lay before assembling the sections.

[0040] - Avoiding damage to the cables by placing them in recesses thereby minimizing the risk of the cables being squeezed during assembly.

[0041] The invention also relates to a kit of a concrete segment as described above and a heating device, the heating device being at least partially distributed in at least one recess provided in a connecting surface of at least one connecting flange, as described above.

[0042] Optionally, the kit further comprises a retaining device configured to retain the heating device within the at least one recess.

[0043] Optionally, the holding means comprises at least one layer of solidified filler material which, once located within the at least one recess, is at least partially disposed over the heating means.

[0044] Optionally, the at least one layer of solidified filler material comprises a thickness of less than 20 mm, preferably less than 10 mm.

[0045] Optionally, the filler material is selected from among resins and fast-setting mortars.

[0046] The invention also relates to a section of a wind turbine tower comprising at least two concrete sections as described above.

[0047] Optionally, the section comprises an upper flange formed by upper flanges of at least two concrete sections and a lower flange formed by lower flanges of at least two concrete sections.

[0048] Optionally, each of the at least two concrete sections is a concrete section that includes a lower flange, at least one recess is provided in the lower flange, and at least one end of the at least one recess is configured to connect the at least one recess with the inner surface and / or the outer surface, preferably, one recess includes an end configured to connect the recess with the inner surface and / or the outer surface, thereby defining the lower flange of the concrete section. The heating device is provided in the recess, so that only one end of the heating device corresponding to one end of the recess of each concrete section is connected to the inner surface or the outer surface, thereby establishing an electrical connection for each of the concrete sections of the lower flange of the concrete section.

[0049] Optionally, at least one of the at least two concrete sections is a concrete section comprising an upper flange, at least one recess being arranged in the upper flange, and wherein both ends of the at least one recess are configured to connect the at least one recess with the inner surface and / or the outer surface, preferably one recess comprises two ends configured to connect the recess with the inner surface and / or the outer surface and thus connect the recess with the recess of the adjacent transverse section, and at least another of the at least two concrete sections is a concrete block comprising an upper flange, at least one recess being arranged in the upper flange, and wherein at least one end of the at least one recess is configured to connect the at least one recess with a transverse connection surface, preferably each of the two recesses comprises two ends configured to connect each recess with the adjacent transverse section, thereby defining the upper flange of the concrete section. The heating device is arranged in the recess, so that only the two ends of the heating device corresponding to the two ends of the recess of one concrete section are connected to the inner surface or the outer surface, thereby establishing a single electrical connection for the entire upper flange of the concrete section.

[0050] Thus, in the upper flange, the heating device is assembled once the concrete segment has been formed, preferably in the wind farm during a pre-assembly phase of the concrete segment, so that there is a single circuit, while for the lower flange of the segment there are as many circuits as the number of concrete sectors of the concrete segment, since the heating device is placed in each concrete sector in the factory after the concrete sector has set.

[0051] The invention also relates to a wind turbine comprising at least two segments as described above, a joint arranged between the at least two segments and a heating device, the heating device being at least partially distributed in at least one recess, the at least one recess being arranged in the connecting surface of at least one connecting flange of at least two concrete segments.

[0052] The invention also relates to a mould configured to cast a concrete segment as described above, wherein the mould comprises at least a base, a counter-mould and two lateral sides, wherein at least one of the two lateral sides comprises an inner surface, wherein the inner surface comprises at least one protrusion, the at least one protrusion being configured to cast at least one recess.

[0053] The invention also relates to a method for assembling the above-mentioned wind turbine, the method comprising the following steps:

[0054] - a step of lifting at least one concrete section; and

[0055] - The step of arranging a heating device in at least one recess of at least one concrete section.

[0056] Optionally, the step of arranging a heating device within at least one recess of at least one concrete segment is performed before the step of lifting at least one concrete segment.

[0057] Optionally, the step of arranging a heating device within at least one recess of at least one concrete segment is performed after the step of lifting at least one concrete segment.

[0058] Optionally, the method further comprises the steps of disposing a holding device in the at least one recess, and retaining the heating device in the at least one recess such that the heating device is completely embedded in the at least one recess.

[0059] Optionally, the method comprises the step of removing the heating device from the recess and the subsequent step of inserting said heating device into the recess of another concrete section.

[0060] Optionally, in the steps of arranging the retaining device in the at least one recess, holding the heating device in the at least one recess such that the heating device is fully embedded in the at least one recess, an upper portion of the heating device is flush with the connection surface.

[0061] The proposed concrete segments, kits, sections, moulds, wind turbines and methods help solve the problem of curing filler materials in vertical and horizontal joints of building structures in cold climates with ambient temperatures below 5°C. More specifically, both the design of the concrete segments and the described methods allow for the use of an optimal heating system of the precast concrete segments in areas close to the joints between the precast segments. Likewise, they allow for adequate solidification of filler materials deposited between vertical and horizontal joints of precast segments used in wind turbine towers. An additional advantage of the proposed precast segments and methods is that, after use in a precast segment, the heating system can be reused for thermal conditioning of another precast segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] To supplement the description and to contribute to a better understanding of the characteristics of the invention according to a preferred example of its practical embodiment, a set of drawings is attached as an integral part of said description, in which the following are represented by way of illustration and not limitation:

[0063] Figure 1 A front view of a tower of a wind turbine comprising concrete sections according to the invention is shown.

[0064] Figure 2 Shows Figure 1 Section AA and detail of the recess where the heating device is located.

[0065] Figure 3 is a partial view of the interior of a concrete segment according to a first embodiment.

[0066] Figure 4 Shows Figure 3 Horizontal partial view.

[0067] Figure 5 is a partial view of the interior of a concrete segment according to a second embodiment.

[0068] Figure 6 The lower flange of a concrete segment according to the invention is shown.

[0069] Figure 7 The upper flange of a concrete segment according to the invention is shown.

[0070] Figure 8 A partial view of a lateral side of a mold configured to cast a concrete section is shown.

[0071] Fig. 9 Another partial view of a lateral side of a mold configured to cast a concrete segment is shown. DETAILED DESCRIPTION

[0072] The invention describes a concrete segment (10, 10') of a wind turbine tower (100), wherein the concrete segment comprises an inner surface (11), an outer surface (12) and at least one connecting flange (3, 3', 13, 13'), the at least one connecting flange (3, 3', 13, 13') being configured to establish a boundary for producing at least one joint (4) between the concrete segment (10) and an adjacent concrete segment (10, 10'), the at least one connecting flange (3, 3', 13, 13') comprising a connecting surface (6, 6', 16, 16'), characterised in that the concrete segment (10, 10') comprises at least one recess (2, 2'), the at least one recess (2, 2') being arranged in the connecting surface (6, 6', 16, 16') of the at least one connecting flange (3, 3', 13, 13'), the at least one recess being configured to at least partially distribute a heating device (8) in use.

[0073] The concrete section (10, 10') comprises at least two connecting flanges (3, 3', 13, 13'), in particular at least an upper flange (3') and a lower flange (3), wherein each of the at least two connecting flanges (3, 3', 13, 13') comprises a connecting surface (6, 6', 16, 16').

[0074] Preferably, at least one recess (2, 2') is at least partially arranged substantially parallel to the inner surface (11) and the outer surface (12).

[0075] In one embodiment of the upper flange of the concrete section, at least one connecting flange (3, 3') comprises at least two recesses (2, 2'), the at least two recesses being at least an outer recess (2a, 2a') and an inner recess (2b, 2b'), wherein a first radial distance (R1) from the inner recess (2b, 2b') to the inner surface (11) is smaller than a second radial distance (R2) from the outer recess (2a, 2a') to the outer surface (12).

[0076] In another embodiment of the upper flange or the lower flange of another concrete section, there is a single recess (2, 2') comprising an inner branch and an outer branch, wherein a first radial distance (R1) from the inner branch to the inner surface (11) is smaller than a second radial distance (R2) from the outer branch to the outer surface (12).

[0077] Preferably, at least one recess (2, 2') comprises at least one end (14, 15), the at least one end (14, 15) being configured to connect the at least one recess (2, 2') to at least one connecting surface (6, 6', 16, 16') of the concrete segment (10, 10').

[0078] For one embodiment, at least one end (14) is configured to connect at least one recess (2, 2') to the inner surface (11) and / or the outer surface (12), wherein at least one end (14) is inclined or perpendicular to the inner surface (11) and / or the outer surface (12), preferably inclined or perpendicular to the inner surface (11).

[0079] For another embodiment, at least one end portion (15) is configured to connect at least one recess (2, 2') to a connecting surface (16, 16') of at least one transverse flange (13, 13').

[0080] Preferably, the concrete section (10, 10') comprises at least one recess (2') provided in the upper flange (3') and at least one recess (2) provided in the lower flange (3).

[0081] Preferably, the at least one recess (2, 2') comprises a first depth (7, 7'), wherein, in use, the first depth (7, 7') is greater than the height of a heating device (8) at least partially distributed in the at least one recess (2, 2').

[0082] Preferably, the connecting surface (6, 6', 16, 16') comprises a length (21), wherein the at least one recess (2, 2') is substantially evenly distributed along the entire length (21) of the connecting surface (6, 6', 16, 16').

[0083] Preferably, the connecting surface (6, 6', 16, 16') comprises a width (22), wherein the at least one recess (2, 2') is unevenly distributed along the width (22) of the connecting surface (6, 6', 16, 16').

[0084] Preferably, at least one recess (2, 2') is a continuous recess (2, 2'), preferably forming a ring.

[0085] Preferably, at least one recess (2, 2') is arranged in an unreinforced concrete region (23) of the concrete section (10, 10').

[0086] The kit comprises a concrete segment (10, 10') according to any of the preceding claims and a heating device (8), the heating device (8) being at least partially distributed in at least one recess (2, 2') provided in a connecting surface (6, 6', 16, 16') of at least one connecting flange (3, 3', 13, 13').

[0087] Optionally, the kit further comprises a retaining device (17) configured to retain the heating device (8) in the at least one recess (2, 2'). Preferably, the retaining device (17) comprises at least one layer of curing filler material which, once located in the at least one recess (2, 2'), is at least partially arranged above the heating device (8). Preferably, the at least one layer of curing filler material comprises a thickness of less than 20 mm, preferably less than 10 mm. Preferably, the filler material is selected from between a resin and a fast curing mortar.

[0088] The concrete section (50) comprises at least two concrete segments (10, 10') as described above.

[0089] Preferably, the segment (50) comprises an upper flange formed by upper flanges (3') of at least two concrete segments (10, 10') as described above and a lower flange formed by lower flanges (3) of at least two concrete segments (10, 10') as described above.

[0090] For the lower flange, each of the at least two concrete sections (10, 10') is a concrete section (10, 10') in which at least one end (14) is configured to connect at least one recess (2, 2') to the inner surface (11) and / or the outer surface (12) and is arranged in the lower flange (3).

[0091] For the upper flange, at least one of the at least two concrete sections (10, 10') is a concrete section (10, 10') in which both ends (14) of at least one recess (2') are arranged in the upper flange (3), and at least another concrete section (10, 10') of the at least two concrete sections (10, 10') is a concrete section (10, 10') in which at least one end (15) of at least one recess (2') is arranged in the upper flange (3').

[0092] A wind turbine comprises at least two segments as described above, a joint (4) arranged between the at least two segments and a heating device (8) at least partially distributed in at least one recess (2, 2') arranged in a connecting surface (6, 6', 16, 16') of at least one connecting flange (3, 3', 13, 13') of at least two concrete segments (10, 10').

[0093] As described above, a mold configured to cast a concrete segment comprises at least a base, a counter-mold and two lateral sides (103, 103'), wherein at least one of the two lateral sides (103, 103') comprises an inner surface (110, 110'), wherein the inner surface (110) comprises at least one protrusion (52, 52'), and the at least one protrusion (52, 52') is configured to cast at least one recess (2, 2').

Claims

1. A concrete section (10, 10') of a wind turbine tower (100), wherein the concrete section comprises an inner surface (11), an outer surface (12) and at least one connecting flange (3, 3', 13, 13'), the at least one connecting flange (3, 3', 13, 13') being configured to establish a boundary for producing at least one joint (4) between the concrete section (10) and an adjacent concrete section (10, 10'), the at least one connecting flange (3, 3', 13, 13') comprising a connecting surface (6, 6', 16, 16'), characterized in that The concrete section (10, 10') comprises at least one recess (2, 2') arranged in a connection surface (6, 6', 16, 16') of the at least one connection flange (3, 3', 13, 13'), the at least one recess (2, 2') being configured to at least partially distribute a heating device (8) in use.

2. The concrete segment (10, 10') according to claim 1, comprising at least two connecting flanges (3, 3', 13, 13'), in particular at least an upper flange (3') and a lower flange (3), wherein: Each of the at least two connecting flanges (3, 3', 13, 13') comprises a connecting surface (6, 6', 16, 16').

3. The concrete segment (10, 10') according to any one of the preceding claims, wherein: The at least one recess (2, 2') is at least partially arranged substantially parallel to the inner surface (11) and / or the outer surface (12).

4. Concrete segment (10, 10') according to claims 2 and 3, wherein: The at least one connecting flange (3, 3') comprises at least two recesses (2, 2'), the at least two recesses (2, 2') being at least an outer recess (2a, 2a') and an inner recess (2b, 2b'), wherein a first radial distance (R1) from the inner recess (2b, 2b') to the inner surface (11) is smaller than a second radial distance (R2) from the outer recess (2a, 2a') to the outer surface (12), or the at least one connecting flange (3, 3') comprises a single recess (2, 2'), the single recess (2, 2') comprising an inner branch and an outer branch, wherein a first radial distance (R1) from the inner branch to the inner surface (11) is smaller than a second radial distance (R2) from the outer branch to the outer surface (12).

5. The concrete segment (10, 10') according to any one of claims 1 to 4, wherein: The at least one recess (2, 2') comprises at least one end (14, 15) configured to connect the at least one recess (2, 2') to at least one connecting surface (6, 6', 16, 16') of the concrete segment (10, 10').

6. The concrete segment (10, 10') according to claim 5, wherein: The at least one end portion (14) is configured to connect the at least one recess (2, 2') to the inner surface (11) and / or the outer surface (12).

7. The concrete segment (10, 10') according to claim 6, wherein: The at least one end (14) is inclined or perpendicular to the inner surface (11) and / or the outer surface (12).

8. The concrete segment (10, 10') according to claim 5, wherein: The at least one end portion (15) is configured to connect the at least one recess (2, 2') to a connecting surface (16, 16') of at least one transverse flange (13, 13').

9. The concrete segment (10, 10') according to any one of claims 2 to 8, comprising at least one recess (2') provided in the upper flange (3') and at least one recess (2) provided in the lower flange (3).

10. The concrete segment (10, 10') according to any one of the preceding claims, wherein: The at least one recess (2, 2') comprises a first depth (7, 7'), wherein, in use, the first depth (7, 7') is greater than the height of a heating device (8) at least partially distributed in the at least one recess (2, 2').

11. The concrete segment (10, 10') according to any one of the preceding claims, wherein: The connecting surface (6, 6', 16, 16') comprises a length (21), wherein the at least one recess (2, 2') is substantially evenly distributed along the entire length (21) of the connecting surface (6, 6', 16, 16').

12. The concrete segment (10, 10') according to any one of the preceding claims, wherein: The connecting surface (6, 6', 16, 16') comprises a width (22), wherein the at least one recess (2, 2') is unevenly distributed along the width (22) of the connecting surface (6, 6', 16, 16').

13. The concrete segment (10, 10') according to any one of the preceding claims, wherein: The at least one recess (2, 2') is a continuous recess (2, 2'), preferably forming a ring.

14. The concrete segment (10, 10') according to any one of the preceding claims, wherein: The at least one recess (2, 2') is arranged in an unreinforced concrete region (23) of the concrete section (10, 10').

15. A kit of a concrete segment (10, 10') according to any of the preceding claims and a heating device (8), the heating device (8) being at least partially distributed in the at least one recess (2, 2') provided in the connecting surface (6, 6', 16, 16') of the at least one connecting flange (3, 3', 13, 13').

16. Kit according to claim 15, further comprising retaining means (17) configured to retain the heating device (8) in the at least one recess (2, 2').

17. The device according to claim 16, wherein: The holding means (17) comprise at least one layer of a solidifying filler material which, once located in the at least one recess (2, 2'), is at least partially arranged above the heating means (8).

18. A kit according to claim 17, wherein the at least one layer of solidified filler material comprises a thickness of less than 20 mm, preferably less than 10 mm.

19. A kit according to any one of claims 17 or 18, wherein the filler material is selected from between a resin and a fast setting mortar.

20. A section (50) of a wind turbine tower (100), the section (50) comprising at least two concrete sections (10, 10') according to any one of claims 1 to 14.

21. The segment (50) according to claim 20, comprising an upper flange formed by at least two upper flanges (3') of concrete segments (10, 10') according to claim 2 and a lower flange formed by at least two lower flanges (3) of concrete segments (10, 10') according to claim 2.

22. The segment (50) according to claim 21, wherein: Each of the at least two concrete segments (10, 10') is a concrete segment (10, 10') according to claim 6, wherein the at least one end (14) of the at least one recess (2) is arranged in the lower flange (3).

23. The segment (50) according to claim 21, wherein at least one of the at least two concrete segments (10, 10') is a concrete segment (10, 10') according to claim 6, the concrete segment (10, 10') comprising two ends (14), wherein both ends (14) of the at least one recess (2') are arranged in the upper flange (3), and at least one other concrete segment (10, 10') of the at least two concrete segments (10, 10') is a concrete segment (10, 10') according to claim 8, wherein at least one end (15) of the at least one recess (2') is arranged in the upper flange (3').

24. A wind turbine comprising a tower, the tower comprising at least two segments according to any one of claims 20 to 23, a joint (4) arranged between the at least two segments and a heating device (8) at least partially distributed in at least one recess (2, 2') arranged in a connecting surface (6, 6', 16, 16') of at least one connecting flange (3, 3', 13, 13') of at least two concrete segments (10, 10').

25. A mould configured to cast a concrete segment according to any one of claims 1 to 14, wherein: The mold (100) comprises at least a base (101), a counter-mold (102) and two lateral sides (103, 103'), At least one of the two lateral sides (103, 103') comprises an inner surface (110, 110'), wherein the inner surface (110) comprises at least one protrusion (52, 52'), and the at least one protrusion (52, 52') is configured to cast the at least one recess (2, 2').

26. A method of assembling a wind turbine according to claim 24, comprising the steps of: - a step of lifting at least one concrete section (10, 10); as well as - A step of arranging a heating device in at least one recess (2, 2") of said at least one concrete section (10, 10').

27. The method according to claim 26, wherein: The step of arranging a heating device in at least one recess (2, 2") of the at least one concrete segment (10, 10') is performed before the step of lifting the at least one concrete segment (10, 10).

28. The method according to claim 26, wherein: The step of arranging the heating device in at least one recess (2, 2") of the at least one concrete segment (10, 10') is performed after the step of lifting the at least one concrete segment (10, 10).

29. The method according to any one of claims 26 to 28, further comprising the step of arranging a holding device (17) in the at least one recess (2, 2'), and maintaining the heating device (8) in the at least one recess (2, 2') so that the heating device (8) is completely embedded in the at least one recess (2, 2').

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