Fixing device for post-tensioning element of post-tensioning system for tower of wind turbine, guiding system for tower of wind turbine, tower of wind turbine and method for post-tensioning tower of wind turbine

Abstract

The invention relates to a device for fixing a post-tensioning element of a post-tensioning system of a tower of a wind turbine, which can maintain the distance between the inner wall of the tower and the post-tensioning element even if the tower generates a bending moment due to a lateral load. The invention also relates to a post-tensioning system of a tower of a wind turbine, comprising a fixing device and at least one post-tensioning element; and a tower of a wind turbine comprising the post-tensioning system. The invention also relates to a method for fixing a post-tensioning element of a post-tensioning system of a tower of a wind turbine.

Description

[0001] Subject matter of the invention

[0002] The present invention relates to a fixing device for a post-tensioning element of a post-tensioning system of a tower of a wind turbine, which maintains the distance between the inner wall of the tower and the post-tensioning element even when the tower is subjected to a bending moment due to lateral loads.

[0003] The present invention also relates to a post-tensioning system of a tower of a wind turbine, comprising the fixing device described above and at least one post-tensioning element; and to a tower of a wind turbine, comprising the post-tensioning system described above.

[0004] Furthermore, the present invention relates to a method for fixing a post-tensioning element of a post-tensioning system of a tower of a wind turbine. BACKGROUND

[0005] Concrete towers of wind turbines and concrete parts of hybrid towers, which are preferably made of steel and concrete, are usually equipped with a post-tensioning system (e.g. anchor cables, tendons, steel wires, strands, etc.) to ensure that the concrete is subjected to compressive stresses during most of the service life of the wind turbine. That is, adverse tensile stresses in the structure are avoided, which would lead to excessive cracking of the concrete and to fatigue damage of the steel.

[0006] The post-tensioning elements (e.g. tendons) are usually distributed uniformly around the circumference of the tower, so that the post-tensioning resultant force falls approximately on the central vertical axis of the tower, thereby avoiding eccentric forces in the post-tensioning system.

[0007] Wind industry standards and norms usually require a minimum amount of post-tensioning force to be applied to ensure that the concrete does not experience unloading under the quasi-permanent load level. This load level (also referred to as D3 or S3 load level, depending on the norm) is the load level that is exceeded only 1% of the time during the service life of the wind turbine. That is, by applying the minimum post-tensioning force required by the norm, it is ensured that the structure is subjected to compressive stresses during 99% of the service life of the wind turbine.

[0008] The post-tensioning elements (e.g. tendons) are usually arranged in the interior space of the tower, one end extending from the foundation to a transfer piece, which is arranged below the steel section in the case of a hybrid tower or below the nacelle in the case of a full concrete tower. The two ends of the post-tensioning element are fixed to the foundation and the transfer piece, respectively.

[0009] However, since the wind does not blow with the same intensity in all directions in reality, the load level corresponding to the 1% exceedance probability is also not the same in all directions, which leads to an asymmetric loading of the concrete part of a full concrete tower or a hybrid tower. In the case of extreme wind, this can lead to a collapse of the tower.

[0010] For existing wind turbine towers, the tower will bend due to lateral loads, causing the post-tensioning elements to deviate from their designed position. The fixing device of the post-tensioning elements of the tower of the wind turbine of the present invention solves all the above-mentioned drawbacks. SUMMARY

[0011] The present invention relates to a fixing device of post-tensioning elements of a tower of a wind turbine, wherein the tower comprises:

[0012] - a central vertical axis;

[0013] - an inner wall delimiting an inner space inside the tower;

[0014] - a lower end comprising a lower surface and a portion of the inner wall;

[0015] - an upper end comprising an upper surface and a portion of the inner wall;

[0016] - at least one post-tensioning element arranged in the inner space inside the tower;

[0017] - a tower height measured along the central vertical axis of the tower from the lower surface to the upper surface when the tower is in an upright position;

[0018] wherein the fixing device comprises:

[0019] - a housing device configured to house at least partially the at least one post-tensioning element in the inner space, at a first distance from the inner wall of the tower;

[0020] - an anchoring member configured to anchor the housing device to the inner wall of the tower, at a first height along the tower height.

[0021] The fixing device thus constituted is able to limit the relative displacement of the post-tensioning elements with respect to the inner wall of the tower. Thus, even if the tower bends due to lateral loads, the distance between the tower wall and the post-tensioning device remains constant.

[0022] Optionally, the fixing device further comprises a first centering element arranged in the housing device and configured to be arranged, in use, between the at least one post-tensioning element and the housing device.

[0023] The first centering element is configured to keep the at least one post-tensioning element centered in the housing device of the fixing device, even when the tower bends.

[0024] Thus, the first centring element can be arranged together with the post-tensioning element during the process of hoisting the post-tensioning element to be placed in the receiving device.

[0025] Optionally, the fixing device is further configured to adjust the first distance between the at least one post-tensioning element and the inner wall of the tower. When it is necessary to change the distance between the at least one post-tensioning element and the inner wall of the tower, it is not necessary to change the geometry of the tower or the post-tensioning element.

[0026] Optionally, the fixing device is further configured to adjust the position of the at least one post-tensioning element in the circumferential direction relative to the inner wall of the tower. When it is necessary to change the position of the post-tensioning element in the circumferential direction, it is only necessary to operate the fixing device to adjust the position of the at least one post-tensioning element in the circumferential direction relative to the inner wall of the tower, preferably by displacing the receiving member relative to the anchoring member, and / or by displacing the centring element relative to the receiving member, and / or by changing the geometry of the first centring element.

[0027] Optionally, the anchoring member comprises at least one plate, preferably two plates, configured to be anchored to the inner wall of the tower.

[0028] Optionally, the fixing device further comprises a connecting member configured to connect the receiving device and the anchoring device. Preferably, the connecting member comprises a vertical wall, preferably two vertical walls, each of which is connected to one of the plates of the anchoring member. Preferably, the vertical walls are symmetrically arranged relative to the radial direction of the tower. Also preferably, the vertical walls are asymmetrically arranged relative to the radial direction of the tower.

[0029] Optionally, the first distance of the inner wall of the tower to the at least one post-tensioning element in the radial direction of the tower is 0.05 meters to 0.5 meters, preferably 0.09 meters to 0.30 meters.

[0030] Optionally, the first height is in the middle third along the direction of the height of the tower.

[0031] Optionally, the ratio of the first height to the height of the tower (TH) is 0.5 to 0.6, preferably 0.53 to 0.57.

[0032] The present application also relates to a guiding system for post-tensioning elements of a tower of a wind turbine, the system comprising the fixing device described above.

[0033] Optionally, the upper end of the tower further comprises:

[0034] at least one through hole extending from the upper surface of the upper end to the inner wall of the upper end, configured to at least partially receive the at least one post-tensioning element therein;

[0035] The guiding system further comprises a second centering element, which in use is arranged between the at least one post-tensioning element and the through-hole and at a second height in the direction of the tower height.

[0036] The second centering element is capable of orienting the post-tensioning element in the upper part of the tower.

[0037] Optionally, the ratio of the second height to the tower height is 0.97 to 0.999, more preferably 0.98 to 0.99.

[0038] Optionally, the guiding system further comprises at least one protrusion extending from the inner wall towards the central vertical axis of the tower, against which the at least one post-tensioning element in use abuts. Preferably, the at least one protrusion extends circumferentially along the inner wall of the tower. More preferably, the at least one protrusion is at a third height in the direction of the tower height, wherein the ratio of the third height to the tower height is 0.85 to 0.95, preferably 0.87 to 0.93.

[0039] Optionally, the at least one protrusion is provided with a gap, preferably a gap formed at a vertical joint between adjacent concrete segments when the concrete segment comprises at least two concrete segments.

[0040] Optionally, the guiding system further comprises a support plate configured to cover the gap of the protrusion.

[0041] With the above configuration, if the at least one post-tensioning element falls into the gap of the protrusion between the at least two concrete segments at the third height in the direction of the tower height, damage to the at least one post-tensioning element can be avoided.

[0042] The present application also relates to a tower for a wind turbine, the tower comprising:

[0043] - a central vertical axis;

[0044] - an inner wall delimiting an inner space inside the tower;

[0045] - a lower end comprising a lower surface and a portion of the inner wall;

[0046] - an upper end comprising an upper surface and a portion of the inner wall;

[0047] - at least one post-tensioning element arranged in the inner space inside the tower;

[0048] - a tower height measured along the central vertical axis of the tower, being the distance from the lower surface to the upper surface when the tower is in an upright position;

[0049] wherein the tower further comprises the guiding system as described above.

[0050] Optionally, the tower includes multiple of the aforementioned guiding systems, and multiple fixing devices are circumferentially anchored to the inner wall of the tower at a first height along the tower height direction.

[0051] Optionally, the tower further includes at least one first concrete segment, which in turn includes at least two concrete sections.

[0052] Preferably, at a first height along the direction of tower height, multiple fixing devices are anchored circumferentially to at least two concrete segments at the same circumferential position on each of at least two concrete segments.

[0053] Optionally, the upper end of the tower is a second concrete section, which includes at least two concrete segments, and the tower is provided with the aforementioned guide system on each of the at least two concrete segments of the second concrete section.

[0054] Optionally, at least one post-tensioned element forms an angle of 1.3° to 1.5° with the central vertical axis at a third height along the tower height direction, wherein the ratio of the third height to the tower height is 0 to 0.92; and forms an angle of 0° to 1.5° with the central vertical axis at a fourth height along the tower height direction, wherein the ratio of the fourth height to the tower height is 0.88 to 1.

[0055] The present invention also relates to a method for fixing the post-tensioning element of the tower of the above-mentioned wind turbine.

[0056] The method includes:

[0057] - The step of at least partially housing at least one post-tensioned element in the internal space and maintaining a first distance from the inner wall of the tower;

[0058] - The step of anchoring the housing to the inner wall of the tower, so that the housing is at a first height along the direction of the tower height.

[0059] Optionally, the method further includes:

[0060] - The step of centering at least one back-tensioned element in the receiving device.

[0061] Optionally, the method further includes:

[0062] - The step of accommodating at least one back-tensioned element in a through hole extending from the upper surface of the upper end to the inner wall of the upper end;

[0063] - The step of centering at least one post-tensioned element in a through hole at a second height along the direction of tower height.

[0064] Optionally, the method further includes:

[0065] - The step of placing at least one back-tensioning element at a third height along the direction of tower height against at least one protrusion extending from the inner wall toward the central vertical axis of the tower.

[0066] Optionally, the step of anchoring the housing device to the inner wall of the tower, placing the housing device at a first height along the direction of the tower height, includes the sub-step of anchoring the housing device to the inner wall of the concrete segment of the tower section before lifting the concrete segment of the tower section to its predetermined position along the direction of the tower height.

[0067] Optionally, the method includes, prior to the step of at least partially housing at least one back-tensioned element in the internal space and maintaining a first distance from the inner wall of the tower, lifting at least one back-tensioned element along the height direction of the tower, at least to a first height.

[0068] Preferably, the step of lifting at least one back-tensioning element along the height direction of the tower further includes lifting at least one back-tensioning element to at least a third height, preferably at least a second height, more preferably at least a fourth height, and even more preferably at least to the top of the tower height.

[0069] Optionally, the method further includes the step of guiding an auxiliary lifting member by means of a receiving device configured to at least partially house at least one post-tensioning element in an internal space and maintain a first distance from the inner wall of the tower, wherein the step of guiding the auxiliary lifting member is performed before the step of lifting at least one post-tensioning element along the height direction of the tower, at least to a first height. Attached Figure Description

[0070] To supplement the description in the main text and to enable those skilled in the art to better understand the features of the preferred embodiments of the present invention, a set of drawings is attached as an integral part of this specification. The drawings are for illustrative purposes only and do not limit the scope of protection of the present invention. The drawings illustrate the following:

[0071] - Figure 1 An elevation view of a wind turbine tower including at least one fixing device of the present invention is shown, corresponding to the first preferred embodiment;

[0072] - Figure 2 It indicated Figure 1 Top view;

[0073] - Figure 3 It indicated Figure 2 KK section view;

[0074] - Figure 4It indicated Figure 3 Details Z;

[0075] - Figure 5 It indicated Figure 3 Details Y;

[0076] - Figure 6 It indicated Figure 3 Details X;

[0077] - Figure 7 It indicated Figure 3 Details W;

[0078] - Figure 8 It indicated Figure 3 Details V;

[0079] - Figure 9 It indicated Figure 3 Details U;

[0080] - Figure 10 It indicated Figure 3 Details T;

[0081] - Figure 11 A partial cross-sectional view of the tower of a wind turbine including at least one fixing device of the present invention is shown, corresponding to the second preferred embodiment;

[0082] - Figure 12 A perspective view of the fixing device of the present invention is shown, corresponding to the second preferred embodiment. Detailed Implementation

[0083] The present invention will now be described in detail. The present invention relates to a fixing device for the back-tensioned element of a wind turbine tower (100), the device corresponding to the first preferred embodiment being as follows: Figure 7 As shown, the apparatus corresponding to the second preferred embodiment is as follows: Figure 12 As shown,

[0084] The tower (100) includes:

[0085] -Central vertical axis (70);

[0086] -Inner wall (71), which defines the internal space inside the tower (100);

[0087] - Lower end (72), the lower end (72) includes a lower surface (73) and a portion of the inner wall (71);

[0088] - Upper end (74), the upper end (74) includes an upper surface (75) and a portion of the inner wall (71);

[0089] - At least one back-tensioning element (30), said back-tensioning element (30) being disposed in the internal space inside the tower (100);

[0090] - Tower height (TH), which is measured along the central vertical axis (70) of the tower (100) and is the distance from the lower surface (73) to the upper surface (75) when the tower is in an upright position;

[0091] The fixing device includes:

[0092] - Receiving device (1, 101), the receiving device (1, 101) is configured to at least partially receive at least one back tension element (30, 130) in the internal space and maintain a first distance (d1) from the inner wall of the tower.

[0093] - Anchoring member (2, 102), which is configured to anchor the receiving device to the inner wall of the tower, such that the receiving device is at a first height (h1) along the tower height (TH) direction.

[0094] exist Figures 1 to 10 In the first preferred embodiment shown, the fixing device further includes a first centering element (3), which is preferably annular, disposed in the receiving device (1), and configured to be positioned between at least one back tension element (30) and the receiving device (1) in use. Preferably, the first centering element (3) extends beyond the height of the receiving device (1).

[0095] The anchoring member (2) includes two plates (5) configured to be anchored to the inner wall (71) of the tower (100), preferably by bolts and nuts.

[0096] The fixing device also includes a connecting member (4), which is configured to connect the receiving device (1) to the anchoring device (2). In this embodiment, there are two vertical walls (4), each of which is connected to a plate (5) of the anchoring member (2).

[0097] Optionally, in the radial direction of the tower, the first distance from the inner wall of the tower to at least one post-tensioning element is 0.05 m to 0.5 m, preferably 0.09 m to 0.30 m, and more preferably 0.15 m to 0.25 m.

[0098] In this embodiment, the first height is located within the middle third of the tower height. Preferably, the ratio of the first height (h1) to the tower height (TH) is 0.5 to 0.6.

[0099] The guiding system of the post-tensioned elements of the wind turbine tower, such as Figure 3As shown, the guiding system includes the aforementioned fixing device.

[0100] Preferably, the guiding system further includes at least one through hole (31) extending from the upper surface (75) of the upper end (74) to the inner wall (71) of the upper end (74), configured to at least partially accommodate at least one back tensioning element;

[0101] The guiding system further includes a second centering element (7), which is disposed between at least one back tensioning element (30) and the through hole during use, and is located at a second height (h2) along the tower height (TH) direction.

[0102] In this embodiment, the ratio of the second height to the tower height is 0.97 to 0.999.

[0103] In this embodiment, the tower (100) further includes an adapter (20) disposed on the upper end (74) of the tower, wherein at least one back-tensioning element (30) is fixed to the adapter (20) by a threaded nut configured to transfer the load of at least one back-tensioning element (30) to the adapter (20) and then to the tower (100). The guiding system also includes at least one protrusion (9) extending from the inner wall toward the central vertical axis of the tower, wherein at least one back-tensioning element abuts against the protrusion in use, wherein preferably at least one protrusion (9) extends circumferentially along the inner wall of the tower.

[0104] In this embodiment, at least one of the protrusions is located at a third height (h3) along the direction of the tower height, wherein the ratio of the third height to the tower height is 0.85 to 0.95.

[0105] The guiding system further includes an auxiliary guiding member (not shown) configured to guide at least one back-tensioning element (30) at least during the process of receiving at least one back-tensioning element (30) into the internal space of the receiving device (1). Preferably, the auxiliary guiding member includes a rotatable roller whose axis of rotation is substantially perpendicular to at least one back-tensioning element (30).

[0106] The tower (100) of the wind turbine equipped with the above-mentioned guidance system includes:

[0107] -Central vertical axis (70);

[0108] -Inner wall (71), which defines the internal space inside the tower (100);

[0109] - Lower end (72), the lower end (72) includes a lower surface (73) and a portion of the inner wall (71);

[0110] - Upper end (74), the upper end (74) includes an upper surface (75) and a portion of the inner wall (71);

[0111] - At least one back-tensioning element (30), said back-tensioning element (30) being disposed in the internal space inside the tower (100);

[0112] - Tower height (TH), which is measured along the central vertical axis (70) of the tower (100) and is the distance from the lower surface (73) to the upper surface (75) when the tower is in an upright position;

[0113] The tower also includes at least one of the aforementioned guidance systems.

[0114] Preferably, at least one of the back tension elements (30) includes at least one stranded wire disposed inside the sheath.

[0115] Preferably, the tower (100) includes a plurality of the aforementioned guiding systems and a plurality of fixing devices that are circumferentially anchored to the inner wall of the tower at a first height (h1) along the tower height direction.

[0116] The tower includes at least one first concrete segment (50), which in turn includes at least two concrete segments (10), wherein in each of the at least two concrete segments (10), a plurality of fixing devices are anchored at the same circumferential position at a first height along the direction of the tower height on the at least two concrete segments (10).

[0117] The upper end of the tower is a second concrete section (50'), which includes at least two concrete segments, and the tower includes the guidance system as described in claim 12 in each of the at least two concrete segments of the second concrete section.

[0118] In this embodiment, at least one post-tensioning element forms an angle of 1.4° with the central vertical axis at a third height along the tower height direction, wherein the ratio of the third height to the tower height is 0 to 0.92; and forms an angle of 0.9° with the central vertical axis at a fourth height (h4) along the tower height direction, wherein the ratio of the fourth height (h4) to the tower height is 0.88 to 1; and within the section from the fourth height (h4) to the upper surface (75), the angle between the post-tensioning element and the central vertical axis is 0°.

[0119] exist Figures 11 to 12In the second preferred embodiment shown, the fixing device further includes a first centering element (103), which is preferably annular, disposed in the receiving device (101), and configured to be positioned between at least one back tension element (130) and the receiving device (101) in use. Preferably, the first centering element (103) is included within the height range of the receiving device (1).

[0120] The anchoring member (102) includes two plates (105) configured to be anchored to the inner wall (71) of the tower (100), preferably by bolts and nuts.

[0121] The fixing device also includes a connecting member (104) configured to connect the receiving device (101) to the anchoring device (102), which in this embodiment consists of two vertical walls (104), each of which is connected to a plate (105) of the anchoring member (102).

[0122] In this second embodiment, the receiving device (101) is an openable receiving device (101) configured to allow access to its interior and thereby contact with at least one back-tensioning element (130). Preferably, the receiving device (101) comprises two parts connected by a connecting member, preferably by bolts and nuts. This openable structure serves to function when at least one back-tensioning element (130) cannot be properly received into the receiving device (101), or when at least one back-tensioning element (130) is damaged and needs to be replaced.

[0123] In this second embodiment, the receiving device (101) includes: a tapered interface (111) configured to assist the head of the at least one back tensioning element (130) to pass through; and a slider or guide (112) disposed inside the receiving device (101) and configured to prevent the lifting member from rubbing against the receiving device (101), the lifting member being configured to lift the at least one back tensioning element (130).

[0124] Optionally, in the radial direction of the tower, the first distance from the inner wall of the tower to at least one post-tensioning element is 0.05 m to 0.5 m, preferably 0.09 m to 0.30 m, and more preferably 0.15 m to 0.25 m.

[0125] In this embodiment, the first height is located within the middle third of the tower height. Preferably, the ratio of the first height (h1) to the tower height (TH) is 0.5 to 0.6.

[0126] The guiding system of the post-tensioned elements of the wind turbine tower, such as Figure 11 As shown, the guiding system includes the aforementioned fixing device.

[0127] Preferably, the guiding system further includes at least one through hole (31) extending from the upper surface (75) of the upper end (74) to the inner wall (71) of the upper end (74), configured to at least partially accommodate at least one back tensioning element;

[0128] The guiding system further includes a second centering element (107), which is disposed between at least one back tensioning element (130) and the through hole during use, and is located at a second height (h2) along the tower height (TH) direction.

[0129] In this embodiment, the ratio of the second height to the tower height is 0.97 to 0.999.

[0130] In this embodiment, the tower (100) further includes a transition piece (20) disposed on the upper end (74) of the tower, wherein at least one back tensioning element (130) is fixed to the transition piece (20) by an open gasket configured to transfer the load of at least one back tensioning element (30) to the transition piece (20) and further to the tower (100) including the lower flange of the transition piece (20).

[0131] The guiding system also includes at least one protrusion (9) extending from the inner wall toward the central vertical axis of the tower. In use, at least one tensioning element abuts against the protrusion, wherein preferably at least one protrusion (9) extends circumferentially along the inner wall of the tower.

[0132] In this embodiment, at least one of the protrusions is located at a third height (h3) along the direction of the tower height, wherein the ratio of the third height to the tower height is 0.85 to 0.95.

[0133] The guiding system also includes a guard ring (114), which preferably comprises a plastic material, more preferably polyethylene, and is configured to protect at least one back tension element (130).

[0134] The tower (100) of the wind turbine equipped with the above-mentioned guidance system includes:

[0135] -Central vertical axis (70);

[0136] -Inner wall (71), which defines the internal space within the tower (100);

[0137] - Lower end (72), the lower end (72) includes a lower surface (73) and a portion of the inner wall (71);

[0138] - Upper end (74), the upper end (74) includes an upper surface (75) and a portion of the inner wall (71);

[0139] - At least one back-tensioning element (30), said back-tensioning element (30) being located in the internal space within the tower (100);

[0140] - Tower height (TH), which is measured along the central vertical axis (70) of the tower (100) from the lower surface (73) to the upper surface (75) when the tower is in an upright position;

[0141] The tower also includes at least one of the aforementioned guidance systems.

[0142] Preferably, at least one of the back tensioning elements (130) includes at least one stranded wire configured to be in direct contact with the first centering device (103) of the receiving device (101).

[0143] Preferably, the tower (100) further includes a base (115), wherein a retaining ring (114) is preferably made of plastic, more preferably of polyethylene, and is configured to protect at least one back tension element (130). The retaining ring (114) is disposed in the base (115) and is at the same height as the lower surface (73) of the lower end (72) of the guide system.

[0144] Preferably, the tower (100) includes a plurality of the aforementioned guiding systems and a plurality of fixing devices that are circumferentially anchored to the inner wall of the tower at a first height (h1) along the tower height direction.

[0145] The tower includes at least one first concrete section (50), which in turn includes at least two concrete segments (10), wherein a plurality of fixing devices are anchored at the same circumferential position on each of the at least two concrete segments (10) at a first height along the direction of the tower height.

[0146] The upper end of the tower is a second concrete section (50'), which includes at least two concrete segments. The tower is equipped with the aforementioned guide system on each of the at least two concrete segments of the second concrete section.

[0147] In this embodiment, at least one post-tensioning element forms an angle of 1.39° with the central vertical axis at a third height along the tower height direction, wherein the ratio of the third height to the tower height is 0 to 0.92; and forms an angle of 0.96° with the central vertical axis at a fourth height (h4) along the tower height direction, wherein the ratio of the fourth height (h4) to the tower height is 0.88 to 1; and within the section from the fourth height (h4) to the upper surface (75), the angle between the post-tensioning element and the central vertical axis is 0.43°.

Claims

1. A fixing device for the back tension element of a wind turbine tower (100), in, The tower (100) includes: -Central vertical axis (70); - Inner wall (71), the inner wall (71) defines the internal space within the tower (100); - Lower end (72), the lower end (72) includes a lower surface (73) and a portion of the inner wall (71); - Upper end (74), the upper end (74) includes an upper surface (75) and a portion of the inner wall (71); - At least one back-tensioned element (30), said at least one back-tensioned element (30) being located in the internal space within the tower (100); - Tower height (TH), which is measured along the central vertical axis (70) of the tower (100) from the lower surface (73) to the upper surface (75) when the tower is in an upright position; The fixing device includes: - A receiving device (1, 101), the receiving device (1, 101) being configured to at least partially receive the at least one back-tensioned element (30, 130) within the internal space and maintain a first distance (d1) from the inner wall of the tower; and - Anchoring member (2, 102), the anchoring member (2, 102) is configured to anchor the receiving device to the inner wall of the tower, such that the receiving device is at a first height (h1) in the direction of the tower height (TH).

2. The fixing device according to claim 1, the fixing device further comprising a first centering element (3, 103), the first centering element (3, 103) being disposed in the receiving device and configured to be disposed between the at least one back tensioning element and the receiving device in use.

3. The fixing device according to any one of the preceding claims, wherein, The fixing device is also configured to adjust the first distance (d1) between the at least one post-tensioning element and the inner wall of the tower.

4. The fixing device according to any one of the preceding claims, wherein, The fixing device is also configured to adjust the position of the at least one post-tensioning element relative to the inner wall of the tower in the circumferential direction.

5. The fixing device according to any one of the preceding claims, wherein, The anchoring member includes at least one plate (5, 105), preferably two plates, which are configured to be anchored to the inner wall of the tower.

6. The fixing device according to any one of the preceding claims, the fixing device further comprising a connecting member (4, 104) configured to connect the receiving device to the anchoring device.

7. The fixing device according to claims 4 and 5, wherein, The connecting member includes two vertical walls (4, 104), each of which is connected to the plate (5, 105) of the anchoring member.

8. The fixing device according to any one of the preceding claims, wherein, In the radial direction of the tower, the first distance from the inner wall of the tower to the at least one post-tensioning element is 0.05 meters to 0.5 meters, preferably 0.09 meters to 0.30 meters.

9. The fixing device according to any one of the preceding claims, wherein, The first height is located within the middle third of the direction along the tower height.

10. The fixing device according to any one of the preceding claims, wherein, The ratio of the first height (h1) to the tower height (TH) is 0.5 to 0.

6.

11. The fixing device according to claim 2, wherein, The first centering element (3) extends beyond the height of the receiving device (1).

12. The fixing device according to any one of the preceding claims, wherein, The at least one back tension element (30) includes at least one stranded wire disposed inside the sheath.

13. The fixing device according to claim 2, wherein, The first centering element (103) is contained within the height range of the receiving device (101).

14. The fixing device according to claim 2 or 13, wherein, The at least one back tensioning element (130) includes at least one stranded wire configured to be in direct contact with the first centering device (103) of the receiving device (101).

15. The fixing device according to claim 1, wherein, The receiving device (101) is an openable receiving device (101) configured to allow entry into its interior and thereby allow the at least one back tension element (130) to be contacted.

16. The fixing device according to claim 1, wherein, The receiving device (101) includes: a tapered interface (111) configured to assist the head of the at least one back tensioning element (130) to pass through; and a slider or guide (112) disposed inside the receiving device (101) and configured to prevent a lifting member from rubbing against the receiving device (101), the lifting member being configured to lift the at least one back tensioning element (130).

17. A guiding system for the post-tensioning element of a wind turbine tower, comprising the fixing device as described in any of the preceding claims.

18. The guidance system according to claim 17, wherein, The upper end of the tower also includes: - At least one through hole (31), the through hole (31) extending from the upper surface of the upper end to the inner wall of the upper end, is configured to at least partially accommodate the at least one back tensioning element; The guiding system further includes a second centering element (7), which is disposed between the at least one back tensioning element and the through hole during use, and is located at a second height (h2) along the direction of the tower height.

19. The guidance system according to claim 18, wherein, The ratio of the second height to the tower height is 0.97 to 0.

999.

20. The guiding system according to any one of claims 17 to 19, the guiding system further comprising at least one protrusion (9) extending from the inner wall toward the central vertical axis of the tower, wherein, In use, the at least one back tensioning element abuts against the protrusion.

21. The guidance system according to claim 20, wherein, The at least one protrusion (9) extends circumferentially along the inner wall of the tower.

22. The guidance system according to claim 20 or 21, wherein, The at least one protrusion is located at a third height (h3) along the direction of the tower height, wherein the ratio of the third height to the tower height is 0.85 to 0.

95.

23. The guiding system according to any one of claims 17 to 22, the guiding system further comprising an auxiliary guiding member configured to guide the at least one back-tensioning element (30, 130) at least during the process of receiving the at least one back-tensioning element (30, 130) into the internal space of the receiving device (1, 101).

24. The guidance system according to claim 23, wherein, The auxiliary guide member includes a rotatable roller whose axis of rotation is substantially perpendicular to the at least one back tensioning element (130).

25. The guiding system according to any one of claims 17 to 23, the guiding system further comprising a retaining ring (114) configured to protect the at least one back tensioning element (130), the retaining ring (114) preferably comprising a plastic material.

26. A tower for a wind turbine, comprising: -Central vertical axis (70); - Inner wall (71), the inner wall (71) defines the internal space within the tower (100); - Lower end (72), the lower end (72) includes a lower surface (73) and a portion of the inner wall (71); - Upper end (74), the upper end (74) includes an upper surface (75) and a portion of the inner wall (71); - At least one back-tensioning element (30), said back-tensioning element (30) being located in the internal space within the tower (100); - Tower height (TH), which is measured along the central vertical axis (70) of the tower (100) from the lower surface (73) to the upper surface (75) when the tower is in an upright position; The tower also includes a guidance system as described in any one of claims 17 to 25.

27. The tower of claim 26, wherein the tower comprises a plurality of guidance systems as described in any one of claims 17 to 25, wherein, The plurality of fixing devices are circumferentially anchored to the inner wall of the tower at a first height (h1) along the direction of the tower height.

28. The tower according to claim 27, wherein the tower comprises at least one first concrete segment (50), the first concrete segment (50) further comprising at least two concrete segments (10), wherein, In each of the at least two concrete segments (10), a plurality of the fixing devices are anchored at the same circumferential position at the first height along the direction of the tower height on the at least two concrete segments (10).

29. The tower according to any one of claims 26 to 28, wherein, The upper end of the tower is a second concrete section (50'), the second concrete section (50') comprising at least two concrete segments, and in each of the at least two concrete segments of the second concrete section, the tower further comprises the guiding system as described in claim 17.

30. The tower according to any one of claims 26 to 29, wherein, The at least one post-tensioning element forms an angle of 1.3° to 1.5° with the central vertical axis at the third height along the direction of the tower height, wherein the ratio of the third height to the tower height is 0 to 0.92; and the at least one post-tensioning element forms an angle of 0° to 1.5° with the central vertical axis at the fourth height (h4) along the direction of the tower height, wherein the ratio of the fourth height (h4) to the tower height is 0.88 to 1.

31. A method for fixing the post-tensioning element of a wind turbine tower, wherein the wind turbine tower is the wind turbine tower according to any one of claims 26 to 30. in, The method includes: - The step of at least partially accommodating the at least one post-tensioned element in the internal space and maintaining the first distance from the inner wall of the tower; - The step of anchoring the receiving device to the inner wall of the tower, so that the receiving device is at the first height in the direction of the tower height.

32. The method according to claim 31, further comprising: - The step of centering the at least one back-tensioned element in the receiving device.

33. The method according to claim 31 or 32, further comprising: - The step of accommodating the at least one back-tensioned element in a through hole extending from the upper surface of the upper end to the inner wall of the upper end; - At the second height along the direction of the tower height, the step of aligning the at least one post-tensioned element in the through hole.

34. The method according to claim 31 or 32, further comprising: - The step of abutting the at least one back-tensioning element against at least one protrusion extending from the inner wall toward the central vertical axis of the tower at the third height in the direction of the tower height.

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