Marine wind power foundation

Abstract

To provide a marine wind power foundation in which corrosion proof performance is improved.SOLUTION: A marine wind power foundation supports a marine wind turbine W, and includes a plurality of sacrificial anodes 50 provided in the marine wind power foundation. The marine wind power foundation is any one out of a jacket type foundation 100, a mono-pile type foundation and a floating body type foundation. For example, a jacket type foundation 100 includes piles 10, legs 20, transition pieces 30, braces 40, and sacrificial anodes 50, and corrosion can be inhibited by providing the sacrificial anodes 50 on a plurality of legs 20 or a plurality of braces 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an offshore wind turbine foundation. [Background technology]

[0002] In order to support wind turbines offshore, offshore wind power foundations such as jacket foundations are used. For example, Patent Document 1 discloses a structure for supporting an offshore wind turbine by three piles (support pipes). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2013-509520 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for improved corrosion protection performance in offshore wind turbine foundations, including jacket foundations, monopile foundations, and floating foundations.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide an offshore wind turbine foundation with improved corrosion prevention performance. [Means for solving the problem]

[0006] <1> The offshore wind foundation according to aspect 1 of the present invention is an offshore wind foundation that supports an offshore wind turbine, and is characterized in that it comprises a plurality of sacrificial anodes provided on the offshore wind foundation, and the offshore wind foundation is one of a jacket type foundation, a monopile type foundation, and a floating type foundation.

[0007] According to the present invention, an offshore wind foundation supporting an offshore wind turbine includes a plurality of sacrificial anodes. The offshore wind foundation is any one of a jacket type foundation, a monopile type foundation, and a floating foundation. This makes it possible to suppress corrosion of, for example, the jacket type foundation, the monopile type foundation, or the floating foundation that is provided with the sacrificial anodes. Therefore, it is possible to improve the corrosion prevention performance of the offshore wind foundation.

[0008] <2> An offshore wind foundation according to aspect 2 of the present invention is the offshore wind foundation according to aspect 1, characterized in that the offshore wind foundation is a jacket-type foundation, the offshore wind foundation includes a plurality of legs and a plurality of braces connecting the plurality of legs, and the plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces.

[0009] According to the present invention, the plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces included in the jacket-type foundation, which makes it possible to suppress corrosion of the plurality of legs or the plurality of braces provided with the sacrificial anodes in the jacket-type foundation, for example.

[0010] <3> An offshore wind foundation according to aspect 3 of the present invention is characterized in that, in the offshore wind foundation according to aspect 2, the multiple sacrificial anodes are provided on the multiple legs or the multiple braces so as to face the area surrounded by the multiple legs.

[0011] According to the present invention, the sacrificial anodes are provided on the legs or braces so as to face an area surrounded by the legs included in the jacket-type foundation. This makes it possible to prevent the sacrificial anodes from facing the outside of the jacket-type foundation. Therefore, for example, in a jacket-type foundation provided on the ocean, it is possible to prevent driftwood and other floating objects from colliding with the sacrificial anodes.

[0012] <4> An offshore wind foundation according to aspect 4 of the present invention is characterized in that, in the offshore wind foundation according to aspect 2 or 3, the multiple legs include a first leg and a second leg adjacent to the first leg, the multiple braces include a first brace connecting the first leg and the second leg, and the multiple sacrificial anodes are provided on the first brace so as to be inclined toward the area surrounded by the multiple legs with respect to a plane including the first leg, the second leg, and the first brace.

[0013] According to this invention, the multiple sacrificial anodes are provided on the first brace so as to be inclined toward the area surrounded by the multiple legs with respect to a plane including the first leg, the second leg, and the first brace. In other words, the multiple sacrificial anodes provided on the first brace are provided so as not to be inclined toward the side opposite the area surrounded by the multiple legs with respect to the plane including the first leg, the second leg, and the first brace. This makes it possible to prevent the multiple sacrificial anodes from facing the outside of the jacket-type foundation. Therefore, for example, in a jacket-type foundation provided on the ocean, it is possible to prevent driftwood and other floating objects from colliding with the sacrificial anodes.

[0014] <5> An offshore wind foundation according to aspect 5 of the present invention is an offshore wind foundation according to any one of aspects 2 to 4, characterized in that the multiple sacrificial anodes are hidden by the multiple legs or the multiple braces when viewed horizontally from outside the area surrounded by the multiple legs.

[0015] According to the present invention, the sacrificial anodes are hidden by the legs or braces when viewed horizontally from outside the area surrounded by the legs included in the jacket-type foundation. This makes it possible to prevent the sacrificial anodes from facing the outside of the jacket-type foundation. Therefore, for example, in a jacket-type foundation provided on the ocean, it is possible to prevent driftwood and other floating objects from colliding with the sacrificial anodes.

[0016] <6> An offshore wind foundation according to aspect 6 of the present invention is an offshore wind foundation according to any one of aspects 2 to 5, characterized in that a lower part of one of the plurality of legs has an enlarged diameter portion, the outer diameter of the enlarged diameter portion increasing toward the end of one of the plurality of legs that is on the seabed ground side, and one of the plurality of sacrificial anodes is provided in the enlarged diameter portion.

[0017] According to this invention, the lower part of one of the legs included in the jacket-type foundation has an expanded diameter section. The outer diameter of the expanded diameter section increases toward the end of one of the legs that is on the seabed side. In this way, by increasing the outer diameter of the leg on the seabed side, for example, the fatigue strength of the leg on the seabed side can be improved. Therefore, for example, the jacket-type foundation can be stably placed on the seabed.

[0018] In addition, the diameter of the leg is relatively small compared to the diameter of the pile. By increasing the outer diameter of the leg on the seabed side, the difference between the diameter of the leg and the diameter of the pile at the connection part between the leg and the pile can be reduced. Therefore, for example, it is possible to suppress problems in the design of the grout joint between the leg and the pile, which arise when the difference between the diameter of the leg and the diameter of the pile is large, and problems in the design of the temporary support to be installed when connecting the leg and the pile.

[0019] One of the multiple sacrificial anodes is provided in the expanded diameter portion. This makes it possible, for example, to suppress corrosion of the expanded diameter portion of the leg. For example, compared to a case in which a sacrificial anode is not provided in the expanded diameter portion of the leg, it is easier to evenly arrange the sacrificial anode in the longitudinal direction of the leg. Therefore, for example, it is possible to improve the corrosion prevention performance of the leg.

[0020] <7> An offshore wind foundation according to aspect 7 of the present invention is an offshore wind foundation according to any one of aspects 2 to 6, characterized in that a plurality of base plates are provided between the plurality of sacrificial anodes and the plurality of legs or the plurality of braces on which the plurality of sacrificial anodes are provided.

[0021] According to the present invention, in the jacket-type foundation, a plurality of base plates are provided between the plurality of sacrificial anodes and the plurality of legs or the plurality of braces on which the plurality of sacrificial anodes are provided. In other words, in the jacket-type foundation, the base plates are disposed between the sacrificial anodes and the legs or the braces. This makes it possible to suppress the influence on the legs or the braces when, for example, the sacrificial anodes are removed for some reason from the jacket-type foundation after it has been installed offshore.

[0022] <8> An offshore wind foundation according to aspect 8 of the present invention is characterized in that, in the offshore wind foundation according to aspect 7, it further comprises a plurality of ribs connecting one of the plurality of sacrificial anodes and one of the plurality of base plates.

[0023] According to the present invention, the jacket-type foundation further includes a plurality of ribs that connect one of the plurality of sacrificial anodes and one of the plurality of base plates. In other words, in the jacket-type foundation, a plurality of ribs are provided at the connection portion between the sacrificial anode and the base plate. This can improve the strength of the connection portion between the sacrificial anode and the base plate in the jacket-type foundation, for example.

[0024] <9> An offshore wind foundation according to aspect 9 of the present invention is an offshore wind foundation according to any one of aspects 2 to 8, characterized in that the plurality of sacrificial anodes are not provided at a grid point between one of the plurality of legs and one of the plurality of braces, or at a grid point between one of the plurality of braces and a brace different from one of the plurality of braces.

[0025] According to this invention, in the jacket-type foundation, the multiple sacrificial anodes are not provided at a panel point between one of the multiple legs and one of the multiple braces, or at a panel point between one of the multiple braces and a brace different from the one of the multiple braces. In other words, in the jacket-type foundation, the sacrificial anodes are arranged to avoid the panel points between the legs and the braces or the panel points between the braces. In this way, by not arranging the sacrificial anodes at the panel points between the legs and the braces or the panel points between the braces, which are parts with a relatively complicated structure, it is possible to prevent the design of the jacket-type foundation from becoming complicated.

[0026] <10> An offshore wind foundation according to a tenth aspect of the present invention is the offshore wind foundation according to any one of the first to ninth aspects, characterized in that the plurality of sacrificial anodes are located below sea level.

[0027] According to the present invention, in the offshore wind power foundation, the multiple sacrificial anodes are located below the sea level, which makes it possible to effectively prevent, for example, the portion of the offshore wind power foundation below the sea level from corroding.

[0028] <11> An offshore wind foundation according to aspect 11 of the present invention is an offshore wind foundation according to any one of aspects 2 to 10, characterized in that the longitudinal direction of the multiple sacrificial anodes is along the longitudinal direction of the multiple legs on which the multiple sacrificial anodes are provided, or along the longitudinal direction of the multiple braces on which the multiple sacrificial anodes are provided.

[0029] According to the present invention, in the jacket-type foundation, the longitudinal direction of the multiple sacrificial anodes is along the longitudinal direction of the multiple legs on which the multiple sacrificial anodes are provided, or along the longitudinal direction of the multiple braces on which the multiple sacrificial anodes are provided. In other words, the longitudinal direction of the sacrificial anodes is along the longitudinal direction of the legs or the longitudinal direction of the braces. This makes it possible, for example, to easily attach the sacrificial anodes to the jacket-type foundation. Therefore, for example, the workability of attaching the sacrificial anodes to the jacket-type foundation can be improved. Furthermore, for example, the aesthetic appearance of the jacket-type foundation can be improved.

[0030] <12> An offshore wind foundation according to aspect 12 of the present invention is an offshore wind foundation according to any one of aspects 1 to 11, characterized in that the offshore wind foundation is a monopile foundation, the monopile foundation includes a transition piece, and the multiple sacrificial anodes are provided on the transition piece.

[0031] According to the present invention, the offshore wind foundation is a monopile foundation. In the monopile foundation, for example, a monopile is driven into the ground. If a sacrificial anode is provided on the monopile, the sacrificial anode may come off the monopile due to the impact of driving or fatigue failure caused by the driving. The monopile foundation includes a transition piece, and the plurality of sacrificial anodes are provided on the transition piece. By not providing the sacrificial anode on the monopile in this manner, it is possible to prevent the sacrificial anode from coming off the monopile when the monopile is driven. Also, for example, by electrically connecting the transition piece provided with the sacrificial anode and the monopile, it is possible to suppress corrosion of the monopile in addition to the transition piece.

[0032] <13> An offshore wind foundation according to aspect 13 of the present invention is characterized in that, in the offshore wind foundation according to aspect 12, the transition piece is provided with docking equipment, and the multiple sacrificial anodes provided on the transition piece are provided on the opposite side of the axis of the monopile foundation from the docking equipment.

[0033] According to the present invention, a transition piece included in a monopile foundation is provided with a berthing facility. A plurality of sacrificial anodes provided in the transition piece are provided on the opposite side of the axis of the monopile foundation from the berthing facility. In other words, the plurality of sacrificial anodes provided in the transition piece are not provided in the vicinity of the berthing facility. This makes it possible to prevent, for example, a work vessel from interfering with the sacrificial anodes when the work vessel berthes the berthing facility provided in the transition piece.

[0034] <14> An offshore wind foundation according to aspect 14 of the present invention is an offshore wind foundation according to aspect 12 or 13, characterized in that the longitudinal direction of the multiple sacrificial anodes is aligned with the longitudinal direction of the monopile foundation.

[0035] According to the present invention, the longitudinal direction of the multiple sacrificial anodes is aligned with the longitudinal direction of the monopile foundation. This makes it possible, for example, to easily attach the sacrificial anodes to the monopile foundation. Therefore, for example, the workability of attaching the sacrificial anodes to the monopile foundation can be improved. In addition, for example, the aesthetic appearance of the monopile foundation can be improved. Furthermore, for example, interference with the sacrificial anodes by a work vessel approaching the monopile foundation can be further suppressed.

[0036] <15> An offshore wind foundation according to aspect 15 of the present invention is an offshore wind foundation according to any one of aspects 12 to 14, characterized in that a base plate is provided between the multiple sacrificial anodes and the transition piece on which the multiple sacrificial anodes are provided.

[0037] According to the present invention, in the monopile foundation, a base plate is provided between the plurality of sacrificial anodes and the transition piece on which the plurality of sacrificial anodes are provided. In other words, in the monopile foundation, a base plate is disposed between the sacrificial anodes and the transition piece. This makes it possible to suppress any influence on the transition piece when, for example, the sacrificial anodes are removed from the monopile foundation after it has been installed offshore for some reason.

[0038] <16> An offshore wind foundation according to aspect 16 of the present invention is characterized in that, in the offshore wind foundation according to aspect 15, it further comprises a plurality of ribs connecting one of the plurality of sacrificial anodes and one of the plurality of base plates.

[0039] According to the present invention, the monopile foundation further includes a plurality of ribs connecting one of the plurality of sacrificial anodes and one of the plurality of base plates. In other words, in the monopile foundation, a plurality of ribs are provided at the connection portion between the sacrificial anode and the base plate. This can improve the strength of the connection portion between the sacrificial anode and the base plate in the monopile foundation, for example.

[0040] <17> An offshore wind foundation according to a seventeenth aspect of the present invention is an offshore wind foundation according to any one of the first to sixteenth aspects, characterized in that the plurality of sacrificial anodes are located below sea level.

[0041] According to the present invention, in the monopile foundation, the sacrificial anodes are located below sea level, which can effectively prevent, for example, the portion of the monopile foundation below sea level from corroding.

[0042] <18> An offshore wind foundation according to aspect 18 of the present invention is an offshore wind foundation according to any one of aspects 1 to 17, characterized in that the offshore wind foundation is a floating foundation, the floating foundation includes a floating body portion, and the multiple sacrificial anodes are provided on the floating body portion.

[0043] According to the present invention, the offshore wind foundation is a floating foundation. The floating foundation includes a floating body portion. Here, in the floating foundation, at least a portion of the floating body portion is located below the sea level. And, the plurality of sacrificial anodes are provided in the floating body portion. Thereby, for example, corrosion of the portion of the floating body portion below the sea level can be effectively suppressed.

[0044] <19> The offshore wind foundation of aspect 19 of the present invention is an offshore wind foundation that supports an offshore wind turbine, comprising a corrosion protection device provided on the offshore wind foundation, the corrosion protection device passing an anti-corrosion current through a part of the offshore wind foundation, and the offshore wind foundation is one of a jacket type foundation, a monopile type foundation, and a floating foundation.

[0045] According to the present invention, an offshore wind foundation supporting an offshore wind turbine is equipped with a corrosion protection device. The corrosion protection device passes an anti-corrosion current through a portion of the offshore wind foundation. This makes it possible to suppress corrosion of the offshore wind foundation. The offshore wind foundation is any one of a jacket type foundation, a monopile type foundation, and a floating foundation. This makes it possible to suppress corrosion of, for example, the jacket type foundation, the monopile type foundation, or the floating foundation equipped with the corrosion protection device.

[0046] <20> An offshore wind foundation according to aspect 20 of the present invention is the offshore wind foundation according to aspect 19, characterized in that the corrosion protection device uses electricity generated within the offshore wind turbine to flow the corrosion protection current.

[0047] According to this invention, the corrosion protection device uses power generated in the offshore wind turbine to pass an anticorrosion current. This makes it possible to reduce the length of a power cable for the corrosion protection device laid underwater, for example, compared to a case in which power generated on land is used for the corrosion protection device. Alternatively, it is possible to eliminate the need for a power cable for the corrosion protection device laid underwater. Furthermore, it is possible to eliminate the need to consider, for example, a dead battery in the corrosion protection device.

[0048] <21> An offshore wind foundation according to a twenty-first aspect of the present invention is an offshore wind foundation according to a nineteenth aspect, characterized in that the corrosion prevention device uses electricity generated on land to flow the corrosion prevention current.

[0049] According to this invention, the corrosion protection device uses electricity generated on land to run an anticorrosion current. This makes it possible to eliminate the need to consider battery exhaustion in the corrosion protection device even when, for example, an offshore wind turbine installed on an offshore wind power foundation cannot generate electricity. This aspect is particularly useful when, for example, the offshore wind power foundation is installed in a location relatively close to land. Effect of the Invention

[0050] According to the present invention, it is possible to provide an offshore wind turbine foundation with improved corrosion prevention performance. [Brief description of the drawings]

[0051] [Figure 1] FIG. 2 is a front view of the jacket type foundation. [Diagram 2] FIG. 4 is an enlarged front view of the connection structure of the sacrificial anode. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 4 is an enlarged view of a connection portion between the base plate and the core bar shown in FIG. 3. [Diagram 5] 5 is a cross-sectional view taken along the VV direction shown in FIG. 4. [Figure 6] FIG. 2 is a front view of a monopile foundation. [Figure 7] FIG. 1 is a perspective view of a monopile foundation. [Figure 8] FIG. 2 is a front view of the floating foundation. [Figure 9] FIG. 1 is a perspective view of a floating foundation. [Figure 10] FIG. 2 is a front view of a jacket-type foundation equipped with a first example of a corrosion prevention device. [Figure 11] FIG. 11 is a front view of a jacket-type foundation equipped with a second example of a corrosion protection device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0052] (First embodiment) Hereinafter, an offshore wind power foundation according to an embodiment of the present invention will be described with reference to the drawings. The offshore wind power foundation according to this embodiment supports an offshore wind turbine. In this embodiment, the offshore wind power foundation is, for example, any one of a jacket type foundation, a monopile type foundation, and a floating type foundation. The offshore wind power foundation according to this embodiment is provided with a plurality of sacrificial anodes, which suppresses corrosion of the offshore wind power foundation. Below, the manner of attaching sacrificial anodes to offshore wind foundations will be explained separately for jacket-type foundations, monopile-type foundations, and floating-type foundations.

[0053] (When the offshore wind foundation is a jacket foundation) With reference to FIG. 1, a case in which the offshore wind turbine foundation is a jacket-type foundation will be described. As shown in FIG. 1, the jacket type foundation 100 according to this embodiment includes a pile 10, a leg 20, a transition piece 30, a brace 40, and a sacrificial anode 50.

[0054] The pile 10 is driven into the seabed. The upper end of the pile 10 is connected to the lower end of the leg 20. In this way, the pile 10 supports the leg 20 on the seabed. The upper end of the pile 10 and the lower end of the leg 20 are connected, for example, by inserting the lower end of the leg 20 into the upper end of the pile 10. However, without being limited to this, the upper end of the pile 10 and the lower end of the leg 20 may be connected, for example, by a connecting member (not shown).

[0055] The legs 20 support the transition piece 30. A plurality of legs 20 are provided in the jacket type foundation 100. The jacket type foundation 100 includes, for example, four legs 20. In other words, four legs 20 are provided in the jacket type foundation 100 according to this embodiment. Without being limited thereto, the jacket type foundation 100 may include three legs 20, or may include five or more legs 20. In this embodiment, the multiple legs 20 include a first leg 21 and a second leg 22. The first leg 21 is one of the multiple legs 20. The second leg 22 refers to the leg 20 adjacent to the first leg 21 in the circumferential direction of the jacket-type foundation 100. Hereinafter, when there is no need to distinguish between these, they will be referred to as legs 20.

[0056] In this embodiment, for example, a lower portion of one of the multiple legs 20 has an expanded diameter portion 20e. Note that two or more of the multiple legs 20 may have the expanded diameter portion 20e, or all of the multiple legs 20 may have the expanded diameter portion 20e. The outer diameter of the enlarged diameter section 20e increases toward the end on the seabed side, which is one end of the multiple legs 20. In other words, the enlarged diameter section 20e is a portion where the outer diameter of the leg 20 tapers from the bottom to the top.

[0057] The transition piece 30 is a portion that is connected to the offshore wind turbine W. Specifically, a lower end of a tower T of the offshore wind turbine W is connected to the transition piece 30. The transition piece 30 is supported by the leg 20. The braces 40 connect the multiple legs 20 together in the jacket-type foundation 100. In this way, the braces 40 reinforce the jacket-type foundation 100. A plurality of braces 40 are provided in the jacket-type foundation 100. At this time, the braces 40 are arranged to form an X-shape, for example, as shown in FIG. 1. Alternatively, the braces 40 may be arranged horizontally between the legs 20. In this embodiment, the plurality of braces 40 includes a first brace 41. The first brace 41 connects the first leg 21 and the second leg 22.

[0058] The sacrificial anode 50 dissolves in water instead of the legs 20 and the braces 40, thereby suppressing corrosion of the legs 20 and the braces 40. For example, a rod-shaped aluminum material is suitably used for the sacrificial anode 50. In the jacket-type foundation 100 according to this embodiment, a plurality of sacrificial anodes 50 are provided on the plurality of legs 20 or the plurality of braces 40 provided as described above. Here, the portion of the jacket-type foundation 100 that is particularly susceptible to corrosion is the portion located below the sea level S. For this reason, in the jacket-type foundation 100, the multiple sacrificial anodes 50 are preferably arranged so as to be located below the sea level S, for example, as shown in FIG.

[0059] In the jacket-type foundation 100 according to this embodiment, the sacrificial anode 50 and the leg 20 or the brace 40 are connected, for example, by the following connection structure 60. That is, as shown in Figs. 2 and 3, the connection structure 60 of the sacrificial anode 50 to the leg 20 or the brace 40 includes a base plate 61, a core metal 62, and a rib 63.

[0060] The base plate 61 is provided between the multiple sacrificial anodes 50 and the multiple legs 20 or the multiple braces 40 on which the multiple sacrificial anodes 50 are provided. Specifically, the base plate 61 is disposed on the outer circumferential surface of the leg 20 or the brace 40. The base plate 61 is attached to the leg 20 or the brace 40 by, for example, welding. Here, the sacrificial anode 50 may be removed from the jacket-type foundation 100 after it has been installed offshore for some reason. The base plate has a function of preventing the leg 20 or the brace 40 from being affected during the removal work of the sacrificial anode 50.

[0061] The core metal 62 is a rod-shaped member disposed between the base plate 61 and the sacrificial anode 50. For example, as shown in Fig. 2, two core metals 62 are provided for one sacrificial anode 50. The base plate 61 and the core metal 62 are preferably connected by, for example, welding. The core metal 62 and the sacrificial anode 50 are preferably connected by, for example, embedding an end of the core metal 62 inside the sacrificial anode 50. The thickness of the core metal 62 is preferably determined appropriately, taking into account conditions such as the stress expected for the core metal 62.

[0062] The rib 63 connects one of the multiple sacrificial anodes 50 to one of the multiple base plates 61. Specifically, the rib 63 is a plate-shaped member that reinforces the connection between the base plate 61 and the core metal 62, as shown in Figs. The ribs 63 are connected to the base plate 61 and the core metal 62 by, for example, welding. For example, as shown in Fig. 5, four ribs 63 are provided in a cross shape on each core metal 62. In this way, the ribs 63 reinforce the connection between the base plate 61 and the core metal 62.

[0063] When multiple sacrificial anodes 50 are attached to the leg 20 or the brace 40, they are provided, for example, at intervals along the longitudinal direction of the leg 20 or the brace 40. In this case, it is preferable that the sacrificial anodes 50 are evenly arranged, for example, in the region of the leg 20 or the brace 40 where the sacrificial anodes 50 are provided. When the sacrificial anode 50 is attached to the leg 20, the longitudinal direction of the sacrificial anode 50 is aligned with the longitudinal direction of the leg 20. When the sacrificial anode 50 is attached to the brace 40, the longitudinal direction of the sacrificial anode 50 is aligned with the longitudinal direction of the brace 40.

[0064] Here, one of the multiple sacrificial anodes 50 is provided in the expanded diameter portion 20e. Alternatively, multiple sacrificial anodes 50 may be provided in the expanded diameter portion 20e. In this case, the sacrificial anode 50 is preferably along the outer peripheral surface of the expanded diameter portion 20e that is inclined with respect to the longitudinal direction of the leg 20, for example, as shown in Fig. 1. In this embodiment, the longitudinal direction of the sacrificial anode 50 being along the longitudinal direction of the leg 20 also includes the sacrificial anode 50 being along the outer peripheral surface of the expanded diameter portion 20e, as described above.

[0065] In the jacket-type foundation 100 according to this embodiment, it is preferable that the multiple sacrificial anodes 50 are not provided at a grid point between one of the multiple legs 20 and one of the multiple braces 40, or at a grid point between one of the multiple braces 40 and a brace 40 different from one of the multiple braces 40. In other words, in the jacket-type foundation 100, it is preferable that the sacrificial anodes 50 are arranged to avoid the grid point between the leg 20 and the brace 40 or the grid point between the braces 40.

[0066] In the jacket-type foundation 100 according to this embodiment, the multiple sacrificial anodes 50 are preferably provided on the multiple legs 20 or the multiple braces 40 so as to face, for example, an area surrounded by the multiple legs 20 . Alternatively, it is preferable that the multiple sacrificial anodes 50 are provided on the first brace 41 so as to be inclined toward the area surrounded by the multiple legs 20 with respect to a plane including the first leg 21, the second leg 22, and the first brace 41, for example. Alternatively, the multiple sacrificial anodes 50 are preferably provided so as to be hidden by the multiple legs 20 or the multiple braces 40 when viewed horizontally from outside the area surrounded by the multiple legs 20, for example. In the jacket-type foundation 100 , it is preferable to arrange the multiple sacrificial anodes 50 in any of the manners described above so that the sacrificial anodes 50 do not face the outside of the jacket-type foundation 100 .

[0067] Here, for example, a J tube may be provided in leg 20 of the jacket-type foundation 100 to place and protect an electric cable therein, in order to assist in connecting the electric cable laid on the seabed to the transition piece 30. In this case, it is preferable that the sacrificial anode 50 be provided, for example, avoiding the connection portion between the J tube and leg 20. Specifically, for example, when placing the base plate 61 on the leg 20, it is preferable to place it so as to avoid the connection portion between the J tube and leg 20.

[0068] (When the offshore wind foundation is a monopile foundation) A case where the offshore wind turbine foundation is a monopile foundation will be described with reference to Figs. 6 and 7. As shown in FIGS. 6 and 7, the monopile foundation 200 according to this embodiment includes a monopile 210 and a transition piece 220. The monopile 210 is driven into the seabed. A transition piece 220 is connected to the upper end of the monopile 210. In this way, the monopile 210 supports the transition piece 220 on the sea.

[0069] The transition piece 220 is a part that is connected to the offshore wind turbine W. Specifically, a lower end of a tower T of the offshore wind turbine W is connected to the transition piece 220. The transition piece 220 is supported by the monopile 210. Specifically, as shown in Fig. 6 and Fig. 7, the cylindrical transition piece 220 is connected so as to cover the upper end of the monopile 210. 7, a berthing facility 221 is provided at the transition piece 220 of the monopile foundation 200 according to this embodiment. The berthing facility 221 is provided for berthing a work ship with respect to the transition piece 220, for example.

[0070] The sacrificial anode 50 has the same configuration as that provided in the above-mentioned jacket-type foundation 100. In the monopile-type foundation 200, the multiple sacrificial anodes 50 are preferably arranged so as to be located below the sea level S, for example, as shown in FIG.

[0071] Here, in the monopile foundation 200, for example, the monopile 210 is driven into the ground. At this time, if a sacrificial anode 50 is provided on the monopile 210, the sacrificial anode 50 may come off the monopile 210 due to the impact of driving or fatigue failure caused by driving. For this reason, in the monopile foundation 200 according to this embodiment, it is preferable that a plurality of sacrificial anodes 50 are provided on the transition piece 220. Furthermore, it is more preferable to electrically connect the transition piece 220 provided with the sacrificial anode 50 to the monopile 210, thereby making it possible to suppress corrosion of the monopile 210 in addition to the transition piece 220.

[0072] In the monopile foundation 200 according to this embodiment, the sacrificial anode 50 and the transition piece 220 are connected in the same manner as in the above-described jacket-type foundation 100. That is, the connection structure 60 for connecting the sacrificial anode 50 to the transition piece 220 includes a base plate 61, a core bar 62, and a rib 63. The base plate 61 is connected to the transition piece 220 by, for example, welding. Since other points are the same as the above-mentioned jacket-type foundation 100, the description will be omitted.

[0073] When attaching a plurality of sacrificial anodes 50 to the transition piece 220, for example, they are provided at intervals along the longitudinal direction and circumferential direction of the monopile foundation 200. At this time, it is preferable that the sacrificial anodes 50 are evenly arranged in the region of the transition piece 220 where the sacrificial anodes 50 are provided. When the sacrificial anode 50 is attached to the transition piece 220 , the longitudinal direction of the sacrificial anode 50 is preferably aligned with the longitudinal direction of the monopile foundation 200 .

[0074] Here, the outer peripheral surface of the transition piece 220 may be inclined with respect to the longitudinal direction of the monopile foundation 200, for example. In this case, the sacrificial anode 50 preferably follows the outer peripheral surface of the transition piece 220 that is inclined with respect to the longitudinal direction of the monopile foundation 200, for example, as shown in Fig. 6. In this embodiment, the longitudinal direction of the sacrificial anode 50 following the longitudinal direction of the transition piece 220 also includes the sacrificial anode 50 following the outer peripheral surface of the transition piece 220 that is inclined with respect to the longitudinal direction of the monopile foundation 200, as described above.

[0075] As described above, the transition piece 220 is provided with the docking facility 221. In the monopile foundation 200 according to this embodiment, the multiple sacrificial anodes 50 provided in the transition piece 220 are preferably provided on the opposite side of the axis of the monopile foundation 200 to the docking facility 221. In other words, it is preferable that the multiple sacrificial anodes 50 provided in the transition piece 220 are not provided in the vicinity of the docking facility 221. This preferably prevents, for example, a work vessel from interfering with the sacrificial anodes 50 when the work vessel docks at the docking facility 221 provided in the transition piece 220.

[0076] (When the offshore wind turbine foundation is a floating foundation) A case where the offshore wind foundation is a floating foundation will be described with reference to Figures 8 and 9. The floating foundation 300 is preferably used in cases where the floating foundation 300 is more economical than the jacket foundation 100 or monopile foundation 200, for example, when the water depth at the installation site of the offshore wind turbine W is deep. As shown in FIGS. 8 and 9, the floating foundation 300 according to this embodiment includes a floating body portion 310, a mooring line 320, and a sacrificial anode 50.

[0077] The floating body section 310 is a section that is connected to the offshore wind turbine W. Specifically, the lower end of the tower T of the offshore wind turbine W is connected to the floating body section 310. The floating body section 310 is, for example, hollow, with air sealed inside. This gives the floating body section 310 buoyancy. The offshore wind turbine W connected to the floating body section 310 is supported on the sea by the buoyancy of the floating body section 310. 9, the floating body section 310 has, for example, an L-shape. The floating body section 310 is formed, for example, by combining two bottomed rectangular tubular members.

[0078] One end of the mooring line 320 is fixed to the seabed, and the other end is connected to the floating body section 310. In this way, the mooring line 320 fixes the position of the floating body section 310 on the ocean. For example, a plurality of mooring lines 320 are provided for one floating body section 310. It is preferable that the floating body section 310 is provided with, for example, a connection section for connecting to the mooring line 320.

[0079] The sacrificial anode 50 has the same configuration as that provided in the above-mentioned jacket-type foundation 100. In the floating foundation 300, the multiple sacrificial anodes 50 are preferably arranged so as to be located below the sea level S, for example, as shown in FIG.

[0080] In the floating foundation 300 according to this embodiment, the sacrificial anode 50 and the floating body part 310 are connected in the same manner as in the above-described jacket-type foundation 100. That is, the connection structure 60 of the sacrificial anode 50 to the floating body part 310 includes a base plate 61, a core metal 62, and a rib 63. The base plate 61 is connected to the floating body portion 310 by, for example, welding. Since other points are the same as the above-mentioned jacket-type foundation 100, the description will be omitted.

[0081] In the floating foundation 300, the portion located below the sea level S is, for example, the floating body section 310. For this reason, in the floating foundation 300 according to this embodiment, it is preferable that the multiple sacrificial anodes 50 are provided in the floating body section 310. When the lower end of the tower T of the offshore wind turbine W is located below the sea level S in addition to the floating body section 310, it is more preferable to electrically connect the floating body section 310 and the lower end of the tower T of the offshore wind turbine W, for example, so that corrosion of the lower end of the tower T of the offshore wind turbine W in addition to the floating body section 310 can be suppressed.

[0082] When multiple sacrificial anodes 50 are attached to the floating body part 310, they are provided at intervals on the side, upper surface, or lower surface of the floating body part 310, as shown in Fig. 9. In this case, it is preferable that the sacrificial anodes 50 are evenly arranged in the area of ​​the floating body part 310 where the sacrificial anodes 50 are provided. When the sacrificial anode 50 is attached to the floating body portion 310 , the longitudinal direction of the sacrificial anode 50 is preferably aligned with the longitudinal direction of the bottomed cylinder that forms the floating body portion 310 .

[0083] As described above, according to the offshore wind foundation of this embodiment, the offshore wind foundation supporting the offshore wind turbine W includes a plurality of sacrificial anodes 50. The offshore wind foundation is any one of the jacket type foundation 100, the monopile type foundation 200, and the floating type foundation 300. This makes it possible to suppress corrosion of, for example, the jacket type foundation 100, the monopile type foundation 200, or the floating type foundation 300 that is provided with the sacrificial anodes 50. Therefore, it is possible to improve the corrosion prevention performance of the offshore wind foundation.

[0084] Furthermore, the multiple sacrificial anodes 50 are provided on the multiple legs 20 or the multiple braces 40 included in the jacket-type foundation 100. This makes it possible to suppress corrosion of the multiple legs 20 or the multiple braces 40 on which the sacrificial anodes 50 are provided in the jacket-type foundation 100, for example.

[0085] Furthermore, the multiple sacrificial anodes 50 are provided on the multiple legs 20 or the multiple braces 40 so as to face an area surrounded by the multiple legs 20 included in the jacket-type foundation 100. This makes it possible to prevent the multiple sacrificial anodes 50 from facing the outside of the jacket-type foundation 100. Therefore, for example, in a jacket-type foundation 100 provided on the ocean, it is possible to prevent driftwood and other floating objects from colliding with the sacrificial anodes 50.

[0086] In addition, the multiple sacrificial anodes 50 are provided on the first brace 41 so as to be inclined toward the area surrounded by the multiple legs 20 with respect to a plane including the first leg 21, the second leg 22, and the first brace 41. In other words, the multiple sacrificial anodes 50 provided on the first brace 41 are provided so as not to be inclined toward the side opposite the area surrounded by the multiple legs 20 with respect to a plane including the first leg 21, the second leg 22, and the first brace 41. This makes it possible to prevent the multiple sacrificial anodes 50 from facing the outside of the jacket-type foundation 100. Therefore, for example, in a jacket-type foundation 100 provided on the ocean, it is possible to prevent driftwood and other drifting objects from colliding with the sacrificial anodes 50.

[0087] Furthermore, the multiple sacrificial anodes 50 are hidden by the multiple legs 20 or the multiple braces 40 when viewed horizontally from outside the area surrounded by the multiple legs 20 included in the jacket-type foundation 100. This makes it possible to prevent the multiple sacrificial anodes 50 from facing the outside of the jacket-type foundation 100. Therefore, for example, in a jacket-type foundation 100 provided on the ocean, it is possible to prevent driftwood and other floating objects from colliding with the sacrificial anodes 50.

[0088] Furthermore, a lower portion of one of the legs 20 included in the jacket-type foundation 100 has an expanded diameter section 20e. The outer diameter of the expanded diameter section 20e increases toward the end of one of the legs 20 that is on the seabed side. Increasing the outer diameter of the leg 20 on the seabed side in this manner can improve, for example, the fatigue strength of the leg 20 on the seabed side. Therefore, for example, the jacket-type foundation 100 can be stably placed on the seabed.

[0089] In addition, the diameter of the leg 20 is relatively small compared to the diameter of the pile 10. By increasing the outer diameter of the leg 20 on the seabed ground side, it is possible to reduce the difference between the diameter of the leg 20 and the diameter of the pile 10 at the connection portion between the leg 20 and the pile 10. Therefore, it is possible to suppress problems in designing the grout joint between the leg 20 and the pile 10, which arise when the difference between the diameter of the leg 20 and the pile 10 is large, and problems in designing the temporary support to be provided when connecting the leg 20 and the pile 10.

[0090] One of the multiple sacrificial anodes 50 is provided in the expanded diameter portion 20e. This can, for example, prevent the expanded diameter portion 20e of the leg 20 from corroding. For example, compared to a case where the sacrificial anode 50 is not provided in the expanded diameter portion 20e of the leg 20, it can be made easier to evenly arrange the sacrificial anode 50 in the longitudinal direction of the leg 20. Therefore, for example, the corrosion prevention performance of the leg 20 can be improved.

[0091] In addition, in the jacket-type foundation 100, a plurality of base plates 61 are provided between the plurality of sacrificial anodes 50 and the plurality of legs 20 or the plurality of braces 40 on which the plurality of sacrificial anodes 50 are provided. In other words, in the jacket-type foundation 100, the base plates 61 are disposed between the sacrificial anodes 50 and the legs 20 or the braces 40. This makes it possible to suppress any influence on the legs 20 or the braces 40 when, for example, the sacrificial anodes 50 are removed for some reason from the jacket-type foundation 100 after it has been installed offshore.

[0092] The jacket-type foundation 100 further includes a plurality of ribs 63 that connect one of the plurality of sacrificial anodes 50 and one of the plurality of base plates 61. In other words, in the jacket-type foundation 100, a plurality of ribs 63 are provided at the connection portion between the sacrificial anode 50 and the base plate 61. Thereby, for example, in the jacket-type foundation 100, the strength of the connection portion between the sacrificial anode 50 and the base plate 61 can be improved.

[0093] In addition, in the jacket-type foundation 100, the multiple sacrificial anodes 50 are not provided at a grid point between one of the multiple legs 20 and one of the multiple braces 40, or at a grid point between one of the multiple braces 40 and a brace 40 different from the one of the multiple braces 40. In other words, in the jacket-type foundation 100, the sacrificial anodes 50 are arranged to avoid the grid point between the leg 20 and the brace 40 or the grid point between the braces 40. In this way, by not arranging the sacrificial anodes 50 at the grid point between the leg 20 and the brace 40 or the grid point between the braces 40, which are parts with a relatively complex structure, the design of the jacket-type foundation 100 can be prevented from becoming complicated.

[0094] Furthermore, in the offshore wind power foundation, the multiple sacrificial anodes 50 are located below the sea level S. This makes it possible, for example, to effectively prevent the portion of the offshore wind power foundation below the sea level S from corroding.

[0095] In addition, in the jacket-type foundation 100, the longitudinal direction of the multiple sacrificial anodes 50 is aligned with the longitudinal direction of the multiple legs 20 on which the multiple sacrificial anodes 50 are provided, or the longitudinal direction of the multiple braces 40 on which the multiple sacrificial anodes 50 are provided. In other words, the longitudinal direction of the sacrificial anodes 50 is aligned with the longitudinal direction of the legs 20 or the longitudinal direction of the braces 40. This makes it possible to, for example, easily attach the sacrificial anodes 50 to the jacket-type foundation 100. Therefore, for example, the workability of attaching the sacrificial anodes 50 to the jacket-type foundation 100 can be improved. Furthermore, for example, the aesthetics of the jacket-type foundation 100 can be improved.

[0096] The offshore wind foundation is a monopile foundation 200. In the monopile foundation 200, for example, a monopile 210 is driven into the ground. At this time, if a sacrificial anode 50 is provided on the monopile 210, the sacrificial anode 50 may come off the monopile 210 due to the impact of driving or fatigue failure caused by driving. The monopile foundation 200 includes a transition piece 220, and the multiple sacrificial anodes 50 are provided on the transition piece. In this way, by not providing the sacrificial anode 50 on the monopile 210, it is possible to prevent the sacrificial anode 50 from coming off the monopile 210 when the monopile 210 is driven. Also, for example, by electrically connecting the transition piece 220 provided with the sacrificial anode 50 to the monopile 210, it is possible to suppress corrosion of the monopile 210 in addition to the transition piece 220.

[0097] Further, a transition piece 220 included in the monopile foundation 200 is provided with a berthing facility 221. The multiple sacrificial anodes 50 provided in the transition piece 220 are provided on the opposite side of the axis of the monopile foundation 200 from the berthing facility 221. In other words, the multiple sacrificial anodes 50 provided in the transition piece 220 are not provided in the vicinity of the berthing facility 221. This makes it possible to prevent, for example, a work vessel from interfering with the sacrificial anodes 50 when the work vessel berthes the berthing facility 221 provided in the transition piece 220.

[0098] Furthermore, the longitudinal direction of the multiple sacrificial anodes 50 is aligned with the longitudinal direction of the monopile foundation 200. This makes it possible, for example, to easily attach the sacrificial anodes 50 to the monopile foundation 200. Therefore, for example, the workability of attaching the sacrificial anodes 50 to the monopile foundation 200 can be improved. Also, for example, the aesthetic appearance of the monopile foundation 200 can be improved. Furthermore, for example, interference with the sacrificial anodes 50 by a work boat approaching the monopile foundation 200 can be further suppressed.

[0099] Furthermore, in the monopile foundation 200, a base plate 61 is provided between the multiple sacrificial anodes 50 and the transition piece 220 on which the multiple sacrificial anodes 50 are provided. In other words, in the monopile foundation 200, the base plate 61 is disposed between the sacrificial anode 50 and the transition piece 220. This makes it possible to suppress any influence on the transition piece 220 when, for example, the sacrificial anode 50 is removed for some reason from the monopile foundation 200 after it has been installed offshore.

[0100] Moreover, the monopile foundation 200 further includes a plurality of ribs 63 connecting one of the plurality of sacrificial anodes 50 and one of the plurality of base plates 61. In other words, in the monopile foundation 200, a plurality of ribs 63 are provided at the connection portion between the sacrificial anode 50 and the base plate 61. Thereby, for example, in the monopile foundation 200, the strength of the connection portion between the sacrificial anode 50 and the base plate 61 can be improved.

[0101] Furthermore, in the monopile foundation 200, the multiple sacrificial anodes 50 are located below the sea level S. This makes it possible, for example, to effectively prevent the portion of the monopile foundation 200 below the sea level S from corroding.

[0102] The offshore wind foundation is a floating foundation 300. The floating foundation 300 includes a floating body portion 310. In the floating foundation 300, at least a portion of the floating body portion 310 is located below the sea level S. The plurality of sacrificial anodes 50 are provided in the floating body portion 310. This can effectively prevent, for example, the portion of the floating body portion 310 below the sea level from corroding.

[0103] Second embodiment Next, an offshore wind power foundation according to a second embodiment of the present invention will be described with reference to Figs. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted, with only the differences being described. In the first embodiment, the offshore wind foundation is, for example, any one of a jacket-type foundation 100, a monopile-type foundation 200, and a floating foundation 300. In Fig. 10 and Fig. 11, a case where the offshore wind foundation is the jacket-type foundation 100 will be described as an example.

[0104] The offshore wind foundation according to the second embodiment is provided with a corrosion prevention device 400. The corrosion prevention device 400 is a power supply device that flows an anticorrosion current to a part of the offshore wind foundation. The anticorrosion current is, for example, a direct current. This prevents the offshore wind foundation from corroding. The corrosion prevention device 400 is appropriately connected to, for example, each of the jacket type foundation 100, the monopile type foundation 200, and the floating type foundation 300 via an electric cable 400C.

[0105] The corrosion protection device 400, for example, as shown in Fig. 10, uses power generated in the offshore wind turbine W to pass an anticorrosion current. That is, the corrosion protection device 400 functions by being supplied with power generated in the offshore wind turbine W provided on the offshore wind foundation on which the corrosion protection device 400 is provided. In this case, the corrosion protection device 400 is preferably disposed, for example, inside the offshore wind foundation. That is, for example, in the jacket-type foundation 100 shown in Fig. 10, the corrosion protection device 400 is preferably disposed inside the transition piece 30.

[0106] The corrosion prevention device 400 may, for example, use electricity generated on land to pass an anticorrosion current as shown in Fig. 11. That is, the corrosion prevention device 400 may function by being supplied with electricity generated by a power generation facility (not shown) located near the location where the offshore wind power foundation is installed. In this case, the corrosion prevention device 400 is preferably provided, for example, outside the offshore wind power foundation. That is, it is preferably provided, for example, associated with the power generation facility.

[0107] As described above, according to the offshore wind foundation of this embodiment, the offshore wind foundation supporting the offshore wind turbine W is equipped with the corrosion prevention device 400. The corrosion prevention device 400 passes an anticorrosion current through a part of the offshore wind foundation. This makes it possible to suppress corrosion of the offshore wind foundation. The offshore wind foundation is any one of the jacket type foundation 100, the monopile type foundation 200, and the floating type foundation 300. This makes it possible to suppress corrosion of, for example, the jacket type foundation 100, the monopile type foundation 200, or the floating type foundation 300 equipped with the corrosion prevention device 400.

[0108] Furthermore, the corrosion prevention apparatus 400 uses power generated within the offshore wind turbine W to pass an anticorrosion current. This makes it possible to reduce the length of a power cable for the corrosion prevention apparatus 400 laid underwater, for example, compared to a case in which power generated on land is used for the corrosion prevention apparatus 400. Alternatively, it is possible to eliminate the need for a power cable for the corrosion prevention apparatus 400 laid underwater. Furthermore, it is possible to eliminate the need to consider, for example, a dead battery in the corrosion prevention apparatus 400.

[0109] Furthermore, the corrosion prevention device 400 uses power generated on land to pass an anticorrosion current. This makes it unnecessary to consider a dead battery in the corrosion prevention device 400, even if the offshore wind turbine W installed on the offshore wind power foundation cannot generate power, for example. This embodiment is particularly useful, for example, when the offshore wind power foundation is installed in a place relatively close to land.

[0110] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the connection structure 60 of the sacrificial anode 50, if the connection strength between the core metal 62 and the base plate 61 is sufficient, the rib 63 does not need to be provided.

[0111] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0112] 10 stakes Leg 20 20e Expanded diameter part 30 Transition Piece 40 Brace 50 Sacrificial Anode 60 Connection structure 61 Base Plate 62 Core 63 Ribs 100 Jacket Type Foundation 200 Monopile foundation 210 Monopile 220 Transition Piece 300 Floating Foundation 310 Floating Body Section 320 Mooring Line 400 Anti-corrosion Equipment S Sea level T Tower W Offshore Wind Turbine

Claims

1. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a jacket-type foundation, The offshore wind foundation comprises: Multiple legs and a plurality of braces connecting the plurality of legs; Including, The plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces, At least one of the plurality of sacrificial anodes is attached to the leg or the brace via a base plate and a mandrel disposed between the base plate and the sacrificial anode; The base plate and the core metal are connected by welding, and the core metal and the sacrificial anode are connected by embedding an end of the core metal into the sacrificial anode; the plurality of legs includes a first leg and a second leg adjacent to the first leg, the plurality of braces includes a first brace connecting the first leg and the second leg; The offshore wind foundation, characterized in that the plurality of sacrificial anodes are provided on the first brace so as to be positioned on a side of an area surrounded by the plurality of legs with respect to a plane including the first leg, the second leg, and the first brace.

2. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a jacket-type foundation, The offshore wind foundation comprises: Multiple legs and a plurality of braces connecting the plurality of legs; Including, The plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces, The sacrificial anodes are provided on the legs or the braces so as to face an area surrounded by the legs, the plurality of legs includes a first leg and a second leg adjacent to the first leg, the plurality of braces includes a first brace connecting the first leg and the second leg; The offshore wind foundation, characterized in that the plurality of sacrificial anodes are provided on the first brace so as to be positioned on a side of an area surrounded by the plurality of legs with respect to a plane including the first leg, the second leg, and the first brace.

3. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a jacket-type foundation, The offshore wind foundation comprises: Multiple legs and a plurality of braces connecting the plurality of legs; Including, The plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces, The sacrificial anodes are provided on the legs or the braces so as to face an area surrounded by the legs, The offshore wind foundation is characterized in that the plurality of sacrificial anodes are configured so as to be hidden by the plurality of legs or the plurality of braces when viewed horizontally from outside an area surrounded by the plurality of legs.

4. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a jacket-type foundation, The offshore wind foundation comprises: Multiple legs and a plurality of braces connecting the plurality of legs; Including, The plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces, The sacrificial anodes are provided on the legs or the braces so as to face an area surrounded by the legs, The offshore wind foundation, wherein the plurality of sacrificial anodes do not face an outside of the jacket foundation.

5. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a jacket-type foundation, The offshore wind foundation comprises: Multiple legs and a plurality of braces connecting the plurality of legs; Including, The plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces, At least one of the plurality of sacrificial anodes is attached to the leg or the brace via a base plate and a mandrel disposed between the base plate and the sacrificial anode; The base plate and the core metal are connected by welding, and the core metal and the sacrificial anode are connected by embedding an end of the core metal into the sacrificial anode; The sacrificial anodes are provided on the legs or the braces so as to face an area surrounded by the legs, The offshore wind foundation is characterized in that the plurality of sacrificial anodes are configured so as to be hidden by the plurality of legs or the plurality of braces when viewed horizontally from outside an area surrounded by the plurality of legs.

6. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a jacket-type foundation, The offshore wind foundation comprises: Multiple legs and a plurality of braces connecting the plurality of legs; Including, The plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces, At least one of the plurality of sacrificial anodes is attached to the leg or the brace via a base plate and a mandrel disposed between the base plate and the sacrificial anode; The base plate and the core metal are connected by welding, and the core metal and the sacrificial anode are connected by embedding an end of the core metal into the sacrificial anode; The sacrificial anodes are provided on the legs or the braces so as to face an area surrounded by the legs, The offshore wind foundation, wherein the plurality of sacrificial anodes do not face an outside of the jacket foundation.

7. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a jacket-type foundation, The offshore wind foundation comprises: Multiple legs and a plurality of braces connecting the plurality of legs; Including, The plurality of sacrificial anodes are provided on the plurality of legs or the plurality of braces, The sacrificial anodes are provided on the legs or the braces so as to face an area surrounded by the legs, A plurality of base plates are provided between the plurality of sacrificial anodes and the plurality of legs or the plurality of braces on which the plurality of sacrificial anodes are provided, An offshore wind foundation, further comprising: a plurality of cores arranged between the plurality of base plates and the plurality of sacrificial anodes; and a plurality of ribs connecting one of the plurality of sacrificial anodes to one of the plurality of base plates.

8. An offshore wind foundation supporting an offshore wind turbine, comprising: A plurality of sacrificial anodes provided on the offshore wind foundation; Equipped with The offshore wind foundation is a monopile foundation, The monopile foundation includes a monopile and a transition piece connected to the monopile, The plurality of sacrificial anodes are provided on the transition piece, The transition piece and the monopile are electrically connected to each other, A plurality of base plates are provided between the plurality of sacrificial anodes and the transition piece on which the plurality of sacrificial anodes are provided, An offshore wind foundation, further comprising: a plurality of cores arranged between the plurality of base plates and the plurality of sacrificial anodes; and a plurality of ribs connecting one of the plurality of sacrificial anodes to one of the plurality of base plates.

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