JP7223181B1 - Jacket structure, offshore wind turbine, jacket structure system, and offshore wind turbine system - Google Patents

Abstract

An object of the present invention is to provide a jacket structure, an offshore wind turbine, a jacket structure system, and an offshore wind turbine system, each of which has a transition piece whose structure can be shared. A jacket structure (100) including a transition piece (10) for supporting an offshore wind turbine (300) and a plurality of legs (20) provided on the transition piece (10), at least one of the plurality of legs (20) having a first bend. It is characterized by including a part 20b1. [Selection drawing] Fig. 2

Description

The present invention relates to a jacket structure, an offshore wind turbine, a jacket structure system and an offshore wind turbine system.

A plurality of (usually 10 or more) offshore wind turbines used for wind power generation are constructed in one wind farm. Regarding the construction of wind turbines, in order to shorten the process and reduce costs, standardization will be attempted as much as possible, including the jacket structure.
Patent Literature 1 discloses a technique for avoiding resonance in an underwater structure. Specifically, an underwater structure is disclosed in which a support member is filled with a filler in order to freely determine the natural period.
Patent Literature 2 discloses a joint structure in which grout filling positions between a steel pipe pile and an extra steel pipe are limited in order to facilitate removal work of a pile structure.

WO2011/068152 Japanese Patent Application Laid-Open No. 2020-7728

The transition piece that connects the offshore wind turbine and the jacket structure has a complicated structure and requires a high design and manufacturing load. Therefore, it is desirable to share the structure of the transition piece. However, even in the same wind farm, ground conditions and water depth vary depending on the location of the wind turbine. For this reason, the width of the jacket structure that is fixed to the ground via the foundation piles and supports the offshore wind turbine and the butter angle of the legs of the jacket structure usually vary. Therefore, it is a challenge to standardize the structure of the transition piece for jacket structures of various shapes.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and provides a jacket structure, an offshore wind turbine, a jacket structure system, and an offshore wind turbine system that are equipped with a transition piece that can share a structure. With the goal.

In order to solve the above problems, the present invention proposes the following means.
A jacket structure according to the present invention includes a transition piece that supports an offshore wind turbine and a plurality of legs provided on the transition piece, wherein at least one of the plurality of legs is a first It is characterized by including a bent portion.

According to the invention, at least one of the plurality of legs includes a first bend. As a result, even when the intervals between the legs are different at the lower ends of a plurality of jacket structures, the jacket structure can be constructed by appropriately adjusting the bending angle of the first bent portion and the length of the leg below the first bent portion. The structure of the transition piece provided on the body can be made common.

Further, the angle of the first bent portion may be determined according to the tower shape of the offshore wind turbine, the width of the transition piece, the water depth of the seabed, or the ground conditions of the seabed.

According to this invention, the angle of the first bent portion is determined according to the tower shape of the offshore wind turbine, the width of the transition piece, the water depth of the seabed, or the ground conditions of the seabed. As a result, the jacket structure can be optimized according to the installation location.

Further, the distance from one end of the one on the side of the transition piece to the first bent portion is the distance from the other end of the one on the side opposite to the transition piece to the first bent portion. It may be characterized by being shorter than the distance to

According to this invention, the distance from one end of one of the plurality of legs on the side of the transition piece to the first bent portion is shorter than the distance from the other end of the leg opposite to the transition piece to the first bent portion. . That is, the first bent portion is provided on the side of the transition piece in the longitudinal direction of the leg. When sharing a transition piece in a plurality of jacket structures, the structure above the first bent portion is shared. Accordingly, by providing the first bent portion near the transition piece, the common portion can be minimized.

The jacket structure includes a first brace structure connected to the transition piece and closer to the seabed than the transition piece, and a first brace structure connected to the first brace structure and closer to the seabed than the first brace structure. a second brace structure near the sea bed, wherein the first bend is provided between the transition piece and the first brace structure.

According to the invention, the first bend is provided between the transition piece and the first brace structure. As a result, the portions below the first brace structure can be individually designed for each jacket structure, and only the transition piece can be shared. Therefore, the design study of the jacket structure can be performed easily and efficiently.

Further, the first bent portion may be provided between the lower end of the transition piece and the upper end of the intersection of the upper end of the brace included in the first brace structure and the one. .

According to the invention, the first bend is provided intermediate the lower end of the transition piece and the upper end of the intersection of one of the upper ends of the braces included in the first brace structure. In this way, by setting the first bent portion at a position away from the transition piece, it is possible to prevent the input to the transition piece from being applied directly to the first bent portion. Therefore, it is possible to suppress concentration of a large stress on the first bent portion.

Further, the position of the first bent portion may be the same as the position of the lower end of the transition piece when viewed along the horizontal direction.

According to this invention, the position of the first bend is the same as the position of the lower end of the transition piece when viewed along the horizontal direction. Thereby, the inclination and orientation of the leg inside the transition piece can be set independently of the orientation and inclination of the leg positioned below the transition piece. Therefore, the degree of freedom in design can be improved.

Also, the position or angle of the first bent portion may be determined according to the length or inclination of each of the plurality of braces included in the first brace structure.

According to this invention, the position or angle of the first bent portion is determined according to the length or inclination of each of the braces included in the first brace structure. In other words, the specification of the first bent portion is determined after determining in advance the structure of the brace that has the role of ensuring the strength of the jacket structure. As a result, the structure above the first bent portion can be shared, and the strength of the jacket structure can be ensured.

Further, the position of the first bent portion and the position of the second bent portion, which is a bent portion of a leg different from the one of the plurality of legs and corresponds to the first bent portion, It may be characterized as being the same when viewed along the horizontal direction.

According to this invention, the position of the first bent portion in one of the plurality of legs and the position of the second bent portion in the different leg are the same when viewed along the horizontal direction. That is, bent portions are provided at the same height in a plurality of legs. This makes it possible to manage the dimensions easily and efficiently when examining the common ground conditions at the installation locations of a plurality of legs included in one jacket structure. In addition, design conditions can be standardized when a plurality of jacket structures share a transition piece, and examination can be efficiently performed.

Further, the angle of the first bent portion and the angle of the second bent portion are axially symmetrical with respect to an axis parallel to the vertical direction and passing through the center of the offshore wind turbine. good.

According to this invention, the angle of the first bent portion and the angle of the second bent portion are axially symmetrical with respect to the axis parallel to the vertical direction and passing through the center of the offshore wind turbine. By making the structure of the jacket structure symmetrical in this way, the load and moment applied to the jacket structure can be evenly distributed to each part. Therefore, the jacket structure can be made more stable. In addition, as described above, the framework of the jacket structure is axially symmetrical with respect to the axis passing through the center of the offshore wind turbine. However, it is needless to say that if the framework includes attachments such as access passages and the accompanying reinforcement of the framework side, it will not be axially symmetrical.

Further, the position of the first bent portion and the position of the second bent portion, which is a bent portion of a leg different from the one of the plurality of legs and corresponds to the first bent portion, are horizontal. It may be characterized as being different when viewed along a direction.

According to this invention, the position of the first bent portion in one of the plurality of legs and the position of the second bent portion in the leg different from the one are different when viewed along the horizontal direction. As a result, it is possible to flexibly cope with different ground conditions at the installation locations of a plurality of legs included in one jacket structure.

Further, it may be characterized in that a third bent portion is provided at the other end of the one, which is the other end on the side opposite to the transition piece.

According to this invention, the third bent portion is provided at the other end of one of the plurality of legs. As a result, when joining the lower end of the jacket structure to the pile driven into the ground, the angle between the pile and the leg can be accurately adjusted. This invention exhibits a particularly remarkable effect when joining a pile and a leg with a connecting member.

Moreover, it may be characterized by further comprising a rib provided so as to be in contact with the first bent portion and in contact with the lower surface of the transition piece.

According to this invention, the rib is further provided in contact with both the first bent portion and the lower surface of the transition piece. As a result, the strength when stress is concentrated on the first bent portion can be improved, and the strength of the jacket structure can be further secured.

Further, the angle of the first bent portion is a direction perpendicular to the first direction and along the horizontal direction, with the direction along the rotation axis of the offshore wind turbine when the offshore wind turbine faces a predetermined direction as the first direction. is the second direction, and the angle of the first bent portion viewed along the first direction and the angle of the first bent portion viewed along the second direction are the same. good.

According to this invention, the angle of the first bent portion viewed along the first direction is the same as the angle of the first bent portion viewed along the second direction perpendicular to the first direction. That is, the legs of the jacket structure are slanted towards the axis of the offshore wind turbine by the first bend without being biased in either direction. As a result, it is possible to prevent the load or moment applied to the jacket structure from being disproportionately distributed in one direction. Therefore, a more stable jacket structure can be obtained.

Further, for example, as shown in FIG. 2, the first bent portion may be characterized by bending toward the side of an axis passing through the center of the tower of the offshore wind turbine.

According to this invention, the first bent portion is bent toward the side of the axis passing through the center of the tower of the offshore wind turbine. This allows the upper end of the leg to be positioned closer to the axis passing through the center of the offshore wind turbine tower. Therefore, the shape of the leg can be made suitable for reducing the upper end of the transition piece.

Further, for example, as shown in FIG. 4, the first bent portion may be characterized in that it is bent toward the side opposite to the axis passing through the center of the tower of the offshore wind turbine.

According to this invention, the first bent portion is bent toward the side opposite to the axis passing through the center of the tower of the offshore wind turbine. This allows the top of the leg to be positioned further away from the axis through the center of the offshore wind turbine tower. Therefore, the shape of the leg can be made suitable for enlarging the upper end of the transition piece.

A jacket structure according to the present invention includes a transition piece that supports an offshore wind turbine, and a plurality of legs provided on the transition piece, wherein at least one of the plurality of legs includes: A first straight portion and a second straight portion connected to the first straight portion may be included, and the first straight portion and the second straight portion may form a predetermined angle.

According to this invention, at least one of the plurality of legs includes a first straight portion and a second straight portion, and the first straight portion and the second straight portion form a predetermined angle. That is, the leg is bent between the first straight portion and the second straight portion. By appropriately adjusting the angle of the bent portion and the length of the leg, the structure of the transition piece provided in the jacket structure can be made common.

Further, an offshore wind turbine according to the present invention includes a jacket structure including a transition piece and a plurality of legs provided on the transition piece, the offshore wind turbine being supported by the jacket structure, wherein the plurality of legs at least one of includes a first bend.

According to this invention, in the jacket structure included in the offshore wind turbine, at least one of the plurality of legs includes the first bend. Thereby, when providing multiple offshore wind turbines, a transition piece can be shared.

A jacket structure system according to the present invention includes a first jacket structure including a first transition piece that supports the first offshore wind turbine and a plurality of legs provided on the first transition piece; and a second offshore wind turbine. a second jacket structure comprising a supporting second transition piece and a plurality of legs provided on said second transition piece, wherein said first offshore wind turbine and said second offshore wind turbine are The wind farm or sea area provided is the same, the framework of the first offshore wind turbine and the framework of the second offshore wind turbine are the same, and the framework of the first transition piece and the framework of the second transition piece are the same. are the same, and the angle of one bent portion of the plurality of legs included in the first jacket structure and the angle of one bent portion of the plurality of legs included in the second jacket structure are different, It is characterized by

According to this invention, the angle of one bent portion of the plurality of legs included in the first jacket structure and the angle of one bent portion of the plurality of legs included in the second jacket structure are different. As a result, even if the ground conditions of the place where the first wind turbine and the second wind turbine are installed are different, by appropriately adjusting the angle of the bend and the length of the leg, the wind turbine can be positioned above the bend. The transition piece and offshore wind turbine can be shared. Therefore, the design study of the jacket structure system can be efficiently performed.

Further, an offshore wind turbine system according to the present invention includes a first jacket structure including a first transition piece and a plurality of legs provided on the first transition piece, and a first jacket structure supported by the first transition piece. an offshore wind turbine; and a second jacket structure including a second transition piece and a plurality of legs provided on the second transition piece, wherein the second offshore wind turbine is supported by the second transition piece. A wind turbine system, wherein the wind farm or sea area in which the first offshore wind turbine and the second offshore wind turbine are provided are the same, and the framework of the first offshore wind turbine and the framework of the second offshore wind turbine are the same. The framework of the first transition piece and the framework of the second transition piece are the same, and the angle of one bent portion of the plurality of legs included in the first jacket structure and the second jacket structure is different from the angle of one bent portion of a plurality of legs included in .

According to this invention, the angle of one bent portion of the plurality of legs included in the first jacket structure and the angle of one bent portion of the plurality of legs included in the second jacket structure are different. As a result, even if the ground conditions of the place where the first wind turbine and the second wind turbine are installed are different, by appropriately adjusting the angle of the bend and the length of the leg, the wind turbine can be positioned above the bend. The transition piece and offshore wind turbine can be shared. Therefore, the design study of the offshore wind turbine system can be efficiently performed.

Advantageous Effects of Invention According to the present invention, it is possible to provide a jacket structure, an offshore wind turbine, a jacket structure system, and an offshore wind turbine system each having a transition piece that can share a structure.

1 is a perspective view of a jacket structure according to one embodiment of the invention; FIG. FIG. 2 is a front view of the jacket structure shown in FIG. 1; FIG. 2 is a plan view of the jacket structure shown in FIG. 1; 4 is a first modified example of the transition piece; FIG. 11 is a second modified example of the transition piece; FIG. It is a 1st modification of a rib. It is the 2nd modification of a rib.

(First embodiment)
A jacket structure 100 according to an embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2 , the jacket structure 100 is installed on the sea via piles 200 driven into the ground of the seabed, and supports an offshore wind turbine 300 . Specifically, the jacket structure 100 and the pile 200 are connected by the joint member 50 provided in the jacket structure 100 . Jacket structure 100 and offshore wind turbine 300 are connected by transition piece 10 provided in jacket structure 100 .

Jacket structure 100 includes transition piece 10 , legs 20 , ribs 30 , braces 40 and joint members 50 .
The transition piece 10 supports an offshore wind turbine 300 . The transition piece 10 is a part that is arranged at the upper end of the jacket structure 100 and to which the lower end of the offshore wind turbine 300 is connected.

As shown in FIG. 1, the transition piece 10 comprises an upper plate 11, a lower plate 12, a web 13 and a receptacle .
The upper plate 11 is arranged horizontally above the transition piece 10 . Hereinafter, when the upper plate 11 is indicated, it may simply be referred to as the upper end of the transition piece 10 . In this embodiment, the horizontal direction is a direction parallel to the sea surface where the offshore wind turbine 300 is arranged. As shown in FIG. 3, the upper plate 11 is cross-shaped, and the receptacle 14 is arranged in the center.

A lower plate 12 is horizontally disposed at the lower end of the transition piece 10 . Hereinafter, when referring to the lower plate 12 , it may simply be referred to as the lower end of the transition piece 10 . As shown in FIG. 3, the lower plate 12 is cross-shaped like the upper plate 11 and has a socket 14 in the center. As a result, the socket portion 14 of the transition piece 10 is supported at two upper and lower positions.
The web 13 is a member that reinforces the space between the upper plate 11, the lower plate 12, the socket portion 14, and a leg 20, which will be described later. As shown in FIG. 1, the web 13 is a substantially rectangular plate. The web 13 connects the four sides of the substantially square shape to the above-described upper plate 11, lower plate 12, receptacle 14, and leg 20, respectively. This reinforces the transition piece 10 .
The socket portion 14 is a tubular member and is arranged in the center of the transition piece 10 . Receptacle 14 is supported by upper plate 11 , lower plate 12 and web 13 . In this embodiment, an offshore windmill 300 is connected to the socket 14 . Thereby, the offshore wind turbine 300 is supported by the transition piece 10 .

A leg 20 is provided on the transition piece 10 . A plurality of legs 20 are provided in the jacket structure 100 . In this embodiment, four legs 20 are provided. A steel pipe, for example, is used for the leg 20 . A transition piece 10 is connected to the upper end of the leg 20 . A joint member 50 is connected to the lower end of the leg 20 . A portion of the leg 20 between the upper plate 11 of the transition piece 10 and a first bent portion 20b1, which will be described later, is linear. Also, the portion of web 13 that connects to one of socket 14 and leg 20 may be helical.

At least one of the plurality of legs 20 provided on the transition piece 10 has a first bent portion 20b1. In one of the plurality of legs 20, the distance from one end of the leg 20 on the side of the transition piece 10 to the first bent portion 20b1 is the distance from the other end of the leg 20 on the side opposite to the transition piece 10. It is shorter than the distance from the other end to the first bent portion 20b1. That is, in the vertical direction of the leg 20, the first bent portion 20b1 is positioned on the transition piece 10 side. Specifically, the first bent portion 20b1 is positioned closer to the transition piece 10 than at least the central portion of the leg 20 in the vertical direction.

In this embodiment, the first bent portion 20b1 is, for example, as shown in FIG. 20 and the upper end of the intersection with one of the 20. Here, the intersection point means a point where the outer circumference of the brace 40 and the leg 20 intersect. The upper end of the intersection points means the point located at the upper end of the brace 40 among these intersection points. In this embodiment, the vertical direction refers to a direction orthogonal to the sea surface where the offshore wind turbine 300 is installed. Alternatively, the first bent portion 20b1 may be provided on the lower plate 12, as shown in FIG. That is, the position of the first bent portion 20b1 may be the same as the position of the lower end of the transition piece 10 when viewed along the horizontal direction.

The leg 20 located inside the transition piece 10 in the vertical direction is arranged so as to be inclined toward the receptacle 14 side by the first bent portion 20b1. Alternatively, as shown in FIG. 4, the leg 20 located inside the transition piece 10 in the vertical direction may be made substantially parallel to the vertical direction by the first bent portion 20b1. That is, as shown in FIG. 4, the first bent portion 20b1 is bent toward the center of the tower of the offshore wind turbine 300 installed on the transition piece 10, that is, toward the opposite side of the axis passing through the central axis of the socket. may

Alternatively, as shown in FIG. 2, the legs 20 located inside the transition piece 10 in the vertical direction are inclined further toward the receptacle portion 14 than the legs 20 located outside the transition piece 10. good too. That is, as shown in FIG. 2, the first bent portion 20b1 can be bent toward the center of the tower of the offshore wind turbine 300 installed in the transition piece 10, that is, toward the side of the axis passing through the central axis of the socket. good.

The leg 20 and the lower plate 12 are connected by, for example, inserting the leg 20 through a through hole provided in the lower plate 12 . Alternatively, the lower plate 12 may be a so-called through member. Specifically, the leg 20 is divided by the lower plate 12 , and the leg 20 positioned above the lower plate 12 and the leg 20 positioned below the lower plate 12 are welded to the lower plate 12 . may be connected as follows.

In the present embodiment, with respect to the first bent portion 20b1 of any one of the plurality of legs 20, a bent portion of the leg 20 different from the one and corresponding to the first bent portion 20b1 is added to the first bent portion 20b1. This is called a 2-bent portion 20b2. The positions of the first bent portion 20b1 and the second bent portion 20b2 are the same when viewed along the horizontal direction. That is, the first bent portion 20b1 and the second bent portion 20b2 are positioned at the same height. Therefore, among the plurality of legs 20 provided in the jacket structure 100, all the legs 20 have portions bent at the same height.

This contributes to easy and efficient management of dimensions when considering common ground conditions at installation locations of the plurality of legs 20 included in the jacket structure 100 . In addition, it contributes to unifying the design conditions when sharing the transition piece 10 among a plurality of jacket structures 100 and efficiently performing the examination.
Alternatively, when it is necessary to respond flexibly to different ground conditions at the installation locations of the legs 20 included in the jacket structure 100, the position of the first bent portion 20b1 and the position of the second bent portion 20b2 may be different when viewed along the horizontal direction.

Ribs 30 reinforce the connection between transition piece 10 and leg 20 . Specifically, as shown in FIG. 1, it is arranged so as to be in contact with the first bent portion 20b1 and the lower surface of the transition piece 10. As shown in FIG. The rib 30 is a substantially triangular plate, and one side of the substantially triangular shape is in contact with the first bent portion 20 b 1 and the other side is in contact with the lower surface of the transition piece 10 . As a result, the strength when stress is concentrated on the first bent portion 20b1 is improved, and the strength of the jacket structure 100 is further ensured.

Moreover, the ribs 30 may be used to ensure the joint strength between the socket portion 14 and the upper plate 11 . Specifically, the rib 30 may be arranged such that one side of the substantially triangular shape is in contact with the side surface of the receptacle portion 14 and the other side is in contact with the upper surface of the upper plate 11 . When attaching the ribs 30 between the socket portion 14 and the upper plate 11, for example, as shown in FIG. Alternatively, as shown in FIG. 6, two pieces may be arranged from the socket portion 14 toward the direction in which the leg 20 is provided. In this case, the ribs 30 are more preferably arranged directly above the web 13 arranged on the lower surface of the upper plate 11 along the direction in which the web 13 is provided. Alternatively, as shown in FIG. 7, three pieces may be arranged from the socket portion 14 toward the direction in which the leg 20 is provided. Specifically, one rib 30 shown in FIG. 1 and two ribs 30 shown in FIG. 6 may be arranged together. Furthermore, the ribs 30 are not limited to this, and any number of ribs 30 may be arranged at intervals in the circumferential direction of the receptacle 14 .

The brace 40 is a member that connects between a plurality of legs 20 provided in the transition piece 10 and reinforces the jacket structure 100 . A steel pipe, for example, is used for the brace 40 . In this embodiment, brace 40 is configured in an X-shape between legs 20 . As shown in FIGS. 1 and 2 , the X-shape is provided in two stages in the vertical direction of the jacket structure 100 . In such a case, the X-shaped brace 40 connected to the transition piece 10 and closer to the seabed than the transition piece 10 is called a first brace structure 41 . The X-shaped brace 40 connected to the first brace structure 41 and closer to the ground of the seabed than the first brace structure 41 is called a second brace structure 42 .
A first bent portion 20 b 1 is provided between the transition piece 10 and the first brace structure 41 .

The joining member 50 joins the jacket structure 100 to the plurality of piles 200 . As shown in FIG. 4 , the joint member 50 is provided at the lower end of the leg 20 . The joining member 50 includes a sleeve 51 and a connecting member 52. As shown in FIG.
A plurality of sleeves 51 are provided for one of the plurality of legs 20 of the jacket structure 100 . The plurality of sleeves 51 includes straight portions extending along the vertical direction. A stake 200 is inserted into each of the plurality of sleeves 51 . Thereby, the jacket structure 100 and the pile 200 are connected.

The connecting member 52 connects one of the legs 20 and a plurality of sleeves 51 provided for one of the legs 20 . That is, one and a plurality of sleeves 51 of leg 20 are connected by connecting member 52 . When joining the pile 200 and the leg 20 by the connection member 52, if it is necessary to adjust the angle between the pile 200 and the leg 20, the other end of one of the legs 20 provided in the transition piece 10, The other end opposite to the transition piece 10 may be provided with a third bent portion 20b3. At this time, a straight portion of the leg 20 from the portion located at the lower end of the transition piece 10 to the first bent portion 20b1 is referred to as a first straight portion 20s1. A straight portion between the first curved portion 20b1 and the third curved portion 20b3 is called a second straight portion 20s2. The first straight portion 20s1 and the second straight portion 20s2 form a predetermined angle due to the first bent portion 20b1. This allows the other, or lower, end of leg 20 to be parallel to sleeve 51, or at any other suitable angle for consideration.

A plurality of jacket structures 100 having the above configurations are arranged in the same wind farm or sea area. At this time, it is preferable to make the design of the jacket structure 100 the same, but it is difficult because the ground conditions of the places where the jacket structure 100 is installed are different. Therefore, it is preferable to reduce the number of design man-hours by sharing at least the structure of the offshore wind turbine 300 and the structure of the transition piece 10 that is connected to the offshore wind turbine 300 and supports the offshore wind turbine 300 . Specifically, the above configuration is shared by the following.

That is, in the plurality of jacket structures 100 arranged, the angle of the first bent portion 20b1 in each of the plurality of legs 20 is determined by the tower shape of the offshore wind turbine 300, the width of the transition piece 10, the water depth of the seabed, or the ground conditions of the seabed. Decide accordingly. In other words, by appropriately adjusting the inclination angles of the legs 20 provided in the jacket structure 100, the width of the lower end of the jacket structure 100 and the height of the jacket structure 100, that is, the distance from the seabed to the transition piece 10 can be appropriately adjusted. do. Also, the position or angle of the first bent portion 20b1 may be determined according to the length or inclination of each of the braces 40 included in the first brace structure 41. FIG. Alternatively, the length or inclination of each of the braces 40 included in the first brace structure 41 may be determined according to the position or angle of the first bent portion 20b1.

As shown in FIG. 3, the angle of the first bent portion 20b1 is such that the direction along the rotation axis of the offshore wind turbine 300 when the offshore wind turbine 300 faces a predetermined direction is defined as the first direction D1, and the angle is perpendicular to the first direction D1. When the direction along the horizontal direction is defined as a second direction D2, what is the angle of the first bent portion 20b1 seen along the first direction D1 and the angle of the first bent portion 20b1 seen along the second direction D2? make it the same.
Also, the angle of the first bent portion 20b1 and the angle of the second bent portion 20b2 are symmetrical with respect to an axis parallel to the vertical direction and passing through the center of the offshore wind turbine 300 .
By constructing the jacket structure 100 as described above, the structures of the transition piece 10 and the offshore wind turbine 300 are shared by a plurality of jacket structures 100 .

As described above, according to the jacket structure 100 according to this embodiment, at least one of the plurality of legs 20 includes the first bent portion 20b1. As a result, even when the intervals between the legs 20 are different at the lower ends of the plurality of jacket structures 100, the bending angle of the first bent portion 20b1 and the length of the legs 20 below the first bent portion can be appropriately adjusted. Therefore, the structure of the transition piece 10 provided in the jacket structure 100 can be made common.

Also, the angle of the first bent portion 20b1 is determined according to the tower shape of the offshore wind turbine 300, the width of the transition piece 10, the water depth of the seabed, or the ground conditions of the seabed. As a result, the jacket structure 100 can be optimized for the installation location.

Also, the distance from one end of one of the plurality of legs 20 on the side of the transition piece to the first bent portion 20b1 is longer than the distance from the other end of the leg 20 opposite to the transition piece 10 to the first bent portion 20b1. short. That is, the first bent portion 20b1 is provided on the side of the transition piece 10 in the longitudinal direction of the leg 20. As shown in FIG. When sharing the transition piece 10 in a plurality of jacket structures 100, the structure above the first bent portion 20b1 is shared. Accordingly, by providing the first bent portion 20b1 near the transition piece 10, it is possible to reduce the common portion.

Also, the first bent portion 20 b 1 is provided between the transition piece 10 and the first brace structure 41 . As a result, the parts below the first brace structure can be individually designed for each jacket structure 100, and only the transition piece 10 can be shared. Therefore, the design study of the jacket structure 100 can be performed easily and efficiently.

Also, the first bent portion 20b1 is provided between the lower end of the transition piece 10 and the upper end of the intersection between the upper end of the brace 40 included in the first brace structure 41 and one of the legs 20. As shown in FIG. By setting the first bent portion 20b1 away from the transition piece 10 in this way, it is possible to prevent stress applied to the transition piece 10 from being applied directly to the first bent portion 20b1. Therefore, it is possible to prevent a large stress from concentrating on the first bent portion 20b1.

Also, the position of the first bent portion 20b1 is the same as the position of the lower end of the transition piece 10 when viewed along the horizontal direction. Thereby, the inclination and orientation of the leg 20 inside the transition piece 10 can be set independently of the orientation and inclination of the leg 20 positioned below the transition piece 10 . Therefore, the degree of freedom in design can be improved.

Also, the position or angle of the first bent portion 20b1 is determined according to the length or inclination of each of the braces 40 included in the first brace structure 41. As shown in FIG. In other words, the specifications of the first bent portion 20b1 are determined after determining in advance the structure of the brace 40 that serves to ensure the strength of the jacket structure 100. FIG. As a result, the structure above the first bent portion 20b1 can be shared, and the strength of the jacket structure 100 can be ensured.

Also, the position of the first bent portion 20b1 in one of the plurality of legs 20 and the position of the second bent portion 20b2 in the leg 20 different from the one are the same when viewed along the horizontal direction. In other words, the bent portions are provided at the same height in the plurality of legs 20 . This makes it possible to manage the dimensions easily and efficiently when examining the common ground conditions at the installation locations of the plurality of legs 20 included in one jacket structure 100 . In addition, the design conditions for sharing the transition piece 10 among a plurality of jacket structures 100 can be standardized, and the examination can be efficiently performed.

Also, the angle of the first bent portion 20b1 and the angle of the second bent portion 20b2 are axially symmetrical with respect to an axis parallel to the vertical direction and passing through the center of the offshore wind turbine 300 . By making the structure of the jacket structure 100 symmetrical in this way, the load and moment applied to the jacket structure 100 can be evenly distributed to each part. Therefore, the jacket structure 100 can be made more stable. In addition, as described above, the framework of the jacket structure 100 is axially symmetrical with respect to the axis passing through the center of the offshore wind turbine 300 . However, it is needless to say that if the framework includes attachments such as access passages and the accompanying reinforcement of the framework side, it will not be axially symmetrical.

Also, the position of the first bent portion 20b1 in one of the plurality of legs 20 and the position of the second bent portion 20b2 in the different leg 20 are different when viewed along the horizontal direction. Accordingly, it is possible to flexibly cope with different ground conditions at the installation locations of the plurality of legs 20 included in one jacket structure 100 .

A third bent portion 20b3 is provided at the other end of one of the legs 20. As shown in FIG. Accordingly, when joining the lower end of the jacket structure 100 to the pile 200 driven into the ground, the angle between the pile 200 and the leg 20 can be accurately adjusted. The present invention exhibits a particularly remarkable effect when joining the pile 200 and the leg 20 with the connecting member 52 .

Moreover, a rib 30 is further provided in contact with both the first bent portion 20b1 and the lower surface of the transition piece 10. As shown in FIG. This improves the strength when stress is concentrated on the first bent portion 20b1, so that the strength of the jacket structure 100 can be further ensured.

Also, the angle of the first bent portion 20b1 seen along the first direction D1 is the same as the angle of the first bent portion 20b1 seen along the second direction D2 orthogonal to the first direction D1. That is, the legs 20 of the jacket structure 100 are inclined toward the axis of the offshore wind turbine 300 without being biased in any direction by the first bent portions 20b1. As a result, it is possible to prevent the load or moment applied to the jacket structure 100 from being disproportionately distributed in one direction. Therefore, the jacket structure 100 can be made more stable.

Further, as shown in FIG. 2 , the first bent portion 20b1 is bent toward the side of the axis passing through the center of the tower of the offshore wind turbine 300 . Thereby, the upper end of the leg 20 can be positioned closer to the axis passing through the center of the tower of the offshore wind turbine 300 . Therefore, the leg 20 can have a shape suitable for making the upper end of the transition piece 10 small.

Further, as shown in FIG. 4 , the first bent portion 20b1 is bent toward the opposite side of the axis passing through the center of the tower of the offshore wind turbine 300 . This allows the upper end of the leg 20 to be positioned further away from the axis passing through the center of the offshore wind turbine 300 tower. Therefore, the leg 20 can have a shape suitable for enlarging the upper end of the transition piece 10 .

At least one of the plurality of legs 20 includes a first straight portion 20s1 and a second straight portion 20s2, and the first straight portion 20s1 and the second straight portion 20s2 form a predetermined angle. That is, the leg 20 is bent between the first straight portion 20s1 and the second straight portion 20s2. By appropriately adjusting the angle of the bent portion and the length of the leg 20, the structure of the transition piece 10 provided in the jacket structure 100 can be made common.

Moreover, in the jacket structure 100 included in the offshore wind turbine 300, at least one of the plurality of legs 20 includes the first bent portion 20b1. Thereby, when providing multiple offshore wind turbines 300, the transition piece 10 can be shared.

(Second embodiment)
Next, a jacket structure system of a second embodiment according to the present invention will be described.
In the second embodiment, the same reference numerals are assigned to the same components as in the first embodiment, the description thereof is omitted, and only the different points will be described.
The jacket structure system comprises a first jacket structure and a second jacket structure. In the jacket structure system, the wind farm or sea area (eg, 10 km square sea area) in which the first offshore wind turbine and the second offshore wind turbine are provided are the same.

The first jacket structure includes a first transition piece supporting the first offshore wind turbine and a plurality of legs 20 provided on the first transition piece.
The second jacket structure includes a second transition piece supporting the second offshore wind turbine and a plurality of legs 20 provided on the second transition piece.

The first jacket structure and the second jacket structure are the jacket structure 100 in the first embodiment. That is, the skeleton of the first transition piece and the skeleton of the second transition piece are the same, and both are the transition piece 10 in the first embodiment.
The first offshore wind turbine and the second offshore wind turbine are the offshore wind turbine 300 in the first embodiment. That is, the framework of the first offshore wind turbine and the framework of the second offshore wind turbine are the same.

The angle of one bent portion (for example, the first bent portion 20b1) of the plurality of legs 20 included in the first jacket structure and the angle of one bent portion of the plurality of legs 20 included in the second jacket structure is different. That is, in a jacket structure system in which a plurality of jacket structures 100 are provided, by appropriately changing only the structures of the first jacket structure and the second jacket structure, the first transition piece and the second transition piece can be used as a common transition piece. As a piece 10, a common offshore wind turbine 300 is used for the first offshore wind turbine and the second offshore wind turbine.

As described above, according to the jacket structure system according to the second embodiment, the angle of one bent portion of the plurality of legs 20 included in the first jacket structure and the angle of the plurality of legs included in the second jacket structure The angle of one bend of leg 20 is different. As a result, even if the ground conditions at the location where the first wind turbine and the second wind turbine are installed are different, the angle of the bent portion and the length of the leg 20 can be appropriately adjusted so that the position above the bent portion can be achieved. The transition piece 10 and the offshore wind turbine 300 can be shared. Therefore, the design study of the jacket structure system can be efficiently performed.

(Third Embodiment)
Next, an offshore wind turbine system of a third embodiment according to the present invention will be described.
In addition, in the third embodiment, the same reference numerals are assigned to the same components as those in the first and second embodiments, the description thereof is omitted, and only the different points are described.

The offshore wind turbine system includes a first offshore wind turbine and a second offshore wind turbine. The wind farms or sea areas in which the first offshore wind turbine and the second offshore wind turbine are located are the same.
The first offshore wind turbine includes a first jacket structure including a first transition piece and a plurality of legs 20 included in the first transition piece and supported by the first transition piece.
A second offshore wind turbine includes a second jacket structure including a second transition piece and a plurality of legs 20 included in the second transition piece and supported by the second transition piece.

The first jacket structure and the second jacket structure are the jacket structure 100 in the first embodiment. That is, the skeleton of the first transition piece and the skeleton of the second transition piece are the same, and both are the transition piece 10 in the first embodiment.
The first offshore wind turbine and the second offshore wind turbine are the offshore wind turbine 300 in the first embodiment. That is, the framework of the first offshore wind turbine and the framework of the second offshore wind turbine are the same.
What is the angle of one bent portion (for example, the first bent portion 20b1) of the plurality of legs 20 included in the first jacket structure and the angle of one bent portion of the plurality of legs 20 included in the second jacket structure? ,different. In other words, in an offshore wind turbine system in which a plurality of offshore wind turbines 300 are provided, by appropriately changing only the structures of the first jacket structure and the second jacket structure, the first transition piece and the second transition piece can be used as the common transition piece 10. , the offshore wind turbine 300 is common to the first offshore wind turbine and the second offshore wind turbine.

As described above, according to the offshore wind turbine system according to the third embodiment, the angle of one bent portion of the plurality of legs 20 included in the first jacket structure and the plurality of legs included in the second jacket structure The angle of one bend of 20 is different. As a result, even if the ground conditions at the location where the first wind turbine and the second wind turbine are installed are different, the angle of the bent portion and the length of the leg 20 can be appropriately adjusted so that the position above the bent portion can be achieved. The transition piece 10 and the offshore wind turbine 300 can be shared. Therefore, the design study of the offshore wind turbine system can be efficiently performed.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, the jacket structure system is not limited to the first jacket structure and the second jacket structure, and any number of jacket structures 100 may be provided.
The offshore wind turbine system is not limited to the first offshore wind turbine and the second offshore wind turbine, and any number of offshore wind turbines 300 may be provided.
Also, the socket portion 14 of the transition piece 10 may be connected to an object other than an offshore wind turbine.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

10 transition piece 20 leg 20b1 first bent portion 20b2 second bent portion 20b3 third bent portion 20s1 first straight portion 20s2 second straight portion 30 rib 40 brace 41 first brace structure 42 second brace structure 100 jacket structure 300 Offshore wind turbine D1 First direction D2 Second direction

Claims (17)

A transition piece that supports the offshore wind turbine,
a plurality of legs provided on the transition piece;
A jacket structure comprising:
at least one leg of the plurality of legs includes a first bend;
The distance from one end of the one leg on the side of the transition piece to the first bent portion is the distance from the other end of the one leg opposite to the transition piece to the first bent portion. shorter than the distance to the bend,
A jacket structure characterized by: A transition piece that supports the offshore wind turbine,
a plurality of legs provided on the transition piece;
A jacket structure comprising:
at least one leg of the plurality of legs includes a first bend;
The jacket structure is
a first brace structure connected to the transition piece and closer to the ground than the transition piece;
a second brace structure connected to the first brace structure and closer to the ground than the first brace structure;
further comprising
the first bending portion is provided between the transition piece and the first brace structure;
The first bent portion is provided between the lower end of the transition piece and the upper end of the intersection of the upper end of the brace included in the first brace structure and the one leg .
A jacket structure characterized by: The angle of the first bent portion is determined according to the tower shape of the offshore wind turbine, the width of the transition piece, the water depth of the seabed, or the ground conditions of the seabed.
3. A jacket structure according to claim 1 or 2, characterized in that: The position of the first bent portion is the same as the position of the lower end of the transition piece when viewed along the horizontal direction.
A jacket structure according to claim 1, characterized in that: The position or angle of the first bending portion is determined according to the length or inclination of each of the plurality of braces included in the first brace structure.
3. A jacket structure according to claim 2, characterized in that: The position of the first bent portion and the position of the second bent portion, which is a bent portion of a leg different from the one leg among the plurality of legs and corresponds to the first bent portion , viewed along the horizontal direction, are the same,
A jacket structure according to any one of claims 1 to 5, characterized in that: The angle of the first bent portion and the angle of the second bent portion are axially symmetrical with respect to an axis parallel to the vertical direction and passing through the center of the offshore wind turbine,
7. A jacket structure according to claim 6, characterized in that: The position of the first bent portion and the position of the second bent portion, which is a bent portion of a leg different from the one leg among the plurality of legs and corresponds to the first bent portion, Viewed along the horizontal direction, different
A jacket structure according to any one of claims 1 to 5, characterized in that: A third bent portion is provided at the other end of the one leg , which is the other end opposite to the transition piece,
A jacket structure according to any one of claims 1 to 8, characterized in that: Further comprising a rib provided so as to contact the first bent portion and the lower surface of the transition piece,
A jacket structure according to any one of claims 1 to 9, characterized in that: Regarding the angle of the first bent portion, the first direction is the direction along the rotation axis of the offshore wind turbine when the offshore wind turbine faces a predetermined direction, and the second direction is the direction perpendicular to the first direction and along the horizontal direction. two directions, the angle of the first bent portion viewed along the first direction and the angle of the first bent portion viewed along the second direction are the same;
A jacket structure according to any one of claims 1 to 10, characterized in that: The first bent portion is bent toward the side of an axis passing through the center of the tower of the offshore wind turbine,
A jacket structure according to any one of claims 1 to 11, characterized in that: A transition piece that supports the offshore wind turbine,
a plurality of legs provided on the transition piece;
A jacket structure comprising:
at least one of the plurality of legs includes a first bend;
The first bent portion is bent toward a side opposite to an axis passing through the center of the tower of the offshore wind turbine.
A jacket structure characterized by: A jacket structure comprising a transition piece that supports an offshore wind turbine and a plurality of legs provided on the transition piece,
at least one leg of the plurality of legs includes a first straight portion and a second straight portion connected to the first straight portion;
The first straight portion and the second straight portion form a predetermined angle,
The distance from one end of the one leg , which is on the side of the transition piece, to the connection point between the first straight portion and the second straight portion is the other end of the one leg , which is the transition piece. is shorter than the distance from the other end on the opposite side to the connection point between the first straight portion and the second straight portion,
A jacket structure characterized by: An offshore wind turbine supported by the jacket structure, comprising a jacket structure including a transition piece and a plurality of legs provided on the transition piece, wherein
at least one leg of the plurality of legs includes a first bend;
The distance from one end of the one leg on the side of the transition piece to the first bent portion is the distance from the other end of the one leg opposite to the transition piece to the first bent portion. shorter than the distance to the bend,
An offshore wind turbine characterized by: a first jacket structure including a first transition piece supporting a first offshore wind turbine and a plurality of legs provided on the first transition piece;
a second jacket structure including a second transition piece supporting a second offshore wind turbine and a plurality of legs provided on the second transition piece;
A jacket structure system comprising:
wind farms or sea areas in which the first offshore wind turbine and the second offshore wind turbine are provided are the same;
The framework of the first offshore wind turbine and the framework of the second offshore wind turbine are the same, and
the skeleton of the first transition piece and the skeleton of the second transition piece are the same;
The angle of one bent portion of the plurality of legs included in the first jacket structure and the angle of one bent portion of the plurality of legs included in the second jacket structure are different,
A jacket structure system characterized by: a first offshore wind turbine supported by the first transition piece, comprising a first jacket structure including a first transition piece and a plurality of legs provided on the first transition piece;
a second offshore wind turbine supported by the second transition piece, comprising a second jacket structure including a second transition piece and a plurality of legs provided on the second transition piece;
An offshore wind turbine system comprising:
wind farms or sea areas in which the first offshore wind turbine and the second offshore wind turbine are provided are the same;
The framework of the first offshore wind turbine and the framework of the second offshore wind turbine are the same, and
the skeleton of the first transition piece and the skeleton of the second transition piece are the same;
The angle of one bent portion of the plurality of legs included in the first jacket structure and the angle of one bent portion of the plurality of legs included in the second jacket structure are different,
An offshore wind turbine system characterized by:

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