JP2024038729A - jacket structure - Google Patents

Abstract

To provide a jacket structure that improves workability and maintains a sufficient effect of reinforcement.SOLUTION: A jacket structure 100 includes: a tubular first leg 21 that supports an offshore wind turbine 200; and tubular braces 50 each of which has one end in contact with a predetermined portion LC of the first leg 21. The braces 50 comprise a first brace 51 and a second brace 52. Respective tube axes of the first brace 51 and the second brace 52 are arranged such that a distance between the first brace 51 and the second brace 52 is greater than a distance in an intersection state where the tube axis of the first brace 51, the tube axis of the second brace 52 and a tube axis of the first leg 21 intersect at one point.SELECTED DRAWING: Figure 1

Description

The present invention relates to a jacket structure.

In order to place structures such as wind turbines used for wind power generation offshore, a jacket structure made of steel pipes is sometimes used.
Patent Document 1 discloses a structure for alleviating stress concentration at a joint between steel pipes, in which a joint is formed by overlapping steel pipes with different diameters, and grout is poured into the joint.
Patent Document 2 discloses a structure in which a wall is formed by arranging sheet piles in a row of piles and filled with backing material, in order to reduce the amount of steel in a seawall structure that is an offshore structure.

JP 2015-55045 Publication Japanese Patent Application Publication No. 2004-308328

To strengthen the jacket structure, braces are provided that connect the legs of the jacket structure. The leg and the brace are joined by, for example, welding. When welding a plurality of braces to one leg, if the joints of the plurality of braces interfere with each other, there is a problem that workability deteriorates. On the other hand, if an attempt is made to avoid interference between the joints by reducing the outer diameter of the brace, there is a problem that the effect of reinforcing the jacket structure by the brace decreases or the strength of the brace itself is insufficient. .

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a jacket structure that can improve workability and sufficiently maintain the reinforcing effect.

<1> The jacket structure according to aspect 1 of the present invention supports an offshore wind turbine and has a tubular first leg, and one end abuts a predetermined portion of the first leg and has a tubular shape. A jacket structure including a brace, wherein the brace includes a first brace and a second brace, and a tube axis of the first brace, a tube axis of the second brace, and a tube axis of the first leg. A state in which the pipe axes intersect at one point is defined as an intersecting state, and the pipe axes of the first brace and the second brace are such that the distance between the first brace and the second brace is greater than the distance in the intersecting state. , is characterized by being arranged so that it becomes larger.

According to this invention, the tube axes of the first brace and the second brace are arranged such that the distance between the first brace and the second brace is greater than the distance in the intersecting state. As a result, the welded part between the first leg and the first brace (hereinafter referred to as the first welded part) and the welded part between the first leg and the second brace (hereinafter referred to as the second welded part) are moved from the intersecting state. can also be made less likely to interfere. Therefore, the work of welding the first leg to the first brace and the second brace can be facilitated. Therefore, workability can be improved. Therefore, welding reliability can be improved. Additionally, costs can be reduced.

By adopting the above-mentioned aspect, for example, the first welded part and the second welded part are prevented from interfering by reducing the diameters of the first brace and the second brace while maintaining the intersecting state. Thus, the effect of reinforcing the jacket structure by the first brace and the second brace can be sufficiently maintained.

<2> In the jacket structure according to Aspect 2 of the present invention, in the jacket structure according to Aspect 1, the angle between the tube axis of the first brace and the tube axis of the second brace is such that the angle formed by the tube axis of the first brace is along the vertical direction. It is characterized by an angle of approximately 90 degrees.

According to this invention, the angle formed by the tube axis of the first brace and the tube axis of the second brace is approximately 90 degrees when viewed along the vertical direction. Thereby, for example, when the jacket structure includes four legs, the jacket structure can be made to have a square shape in plan view. Therefore, the jacket structure can be made into a stable structure.

<3> The jacket structure according to Aspect 3 of the present invention is the jacket structure according to Aspect 1 or 2, further comprising a first horizontal brace in which the brace is connected to the predetermined portion and is tubular. , one end of the first horizontal brace is in contact with the predetermined portion, and the tube axis of the first horizontal brace and the tube axis of the first leg intersect.

According to the invention, the tube axis of the first horizontal brace and the tube axis of the first leg intersect. Here, for the structural analysis of the jacket structure, analysis using a beam model, that is, a simplified model in which only the neutral axis of each structure is extracted and simplified, is preferably used. Therefore, in order to make the jacket structure closer to the analysis conditions, it is preferable that the tube axes of the tubular members constituting the jacket structure intersect. In contrast, the tube axes of the first horizontal brace and the first leg intersect. In the case of such an embodiment, the structure of the jacket structure can be made closer to the conditions of structural analysis. Therefore, the reliability of structural analysis can be further improved.

<4> The jacket structure according to Aspect 4 of the present invention is the jacket structure according to any one of Aspects 1 to 3, which includes a plurality of steel pipe piles, which are driven into the seabed, and the first leg. , further comprising: a connecting member connecting the steel pipe pile corresponding to the first leg; an upper flange included in the connecting member; and a lower flange included in the connecting member, wherein the predetermined portion is connected to the upper flange. It is characterized in that it is sandwiched between a flange and the lower flange.

According to this invention, the predetermined portion is sandwiched between the upper flange and the lower flange of the connecting member. That is, between the upper flange and the lower flange of the connecting member, the tube axes of the first brace and the second brace are arranged such that the distance between the first brace and the second brace is greater than the distance in the intersecting state. , placed. Thereby, it is possible to prevent the first welded portion and the second welded portion from interfering between the upper flange and the lower flange of the connection member. Therefore, the work of welding the first leg to the first brace and the second brace between the upper flange and the lower flange of the connecting member can be facilitated.

<5> In the jacket structure according to Aspect 5 of the present invention, in the jacket structure according to Aspect 3 or 4, each of the steel pipe pile or the first leg, the first brace, and the first horizontal brace has a The diameter is characterized by decreasing in this order.

According to this invention, the outer diameters of each of the steel pipe pile or the first leg, the first brace, and the first horizontal brace become smaller in this order. That is, among the components of the jacket structure, the steel pipe pile or the first leg is the thickest, and the first horizontal brace is the thinnest. With such a structure, it is possible to improve economical efficiency while maintaining the strength required for the jacket structure.

<6> The jacket structure according to aspect 6 of the present invention is characterized in that in the jacket structure according to any one of aspects 1 to 5, the tube axis of each of the first brace and the second brace does not intersect with the tube axis of the first leg.

According to this invention, the respective tube axes of the first brace and the second brace do not intersect with the tube axis of the first leg. With this structure, the positions of the first brace and the second brace can be moved in parallel toward the outside of the jacket structure from the positions of the first brace and the second brace in the intersecting state. , the first welded portion and the second welded portion can be prevented from interfering with each other. Thereby, for example, even if the outer diameters of the first brace and the second brace are increased, the first welded portion and the second welded portion can be prevented from interfering with each other. Therefore, the effect of reinforcing the jacket structure by the first brace and the second brace can be improved.

<7> A jacket structure according to aspect 7 of the present invention is characterized in that in the jacket structure according to any one of aspects 1 to 6, the respective tube axes intersect.

According to this invention, the respective tube axes of the first brace and the second brace intersect. As a result, when the positions of the first brace and the second brace are moved in parallel toward the outside of the jacket structure from the positions of the first brace and the second brace in the intersecting state, the longitudinal direction of the first leg The first brace and the second brace can be provided line-symmetrically when viewed along the direction. Therefore, the structure of the jacket structure can be made simple.

<8> The jacket structure according to aspect 8 of the present invention is the jacket structure according to any one of aspects 1 to 7, further comprising a second leg that supports the offshore wind turbine and is tubular. The other end of the first brace is in contact with the second leg, and the tube axis of the first brace and the tube axis of the second leg do not intersect.

According to this invention, the other end of the first brace is in contact with the second leg, and the tube axis of the first brace and the tube axis of the second leg do not intersect. With this, for example, when the position of the first brace is moved in parallel toward the outside of the jacket structure from the position of the first brace in the intersecting state, the positional relationship between the second leg and the first brace is changed. , the positional relationship between the first leg and the first brace can be the same. Therefore, the structure of the jacket structure can be made simple.

<9> In the jacket structure according to aspect 9 of the present invention, in the jacket structure according to any one of aspects 1 to 8, the tube axes of the first brace and the second brace do not intersect. It is characterized by

According to this invention, the respective tube axes of the first brace and the second brace do not intersect. With such a structure, for example, the position of the first brace can be changed from the position of the first brace in the intersecting state to the intersection of the central axis of the first leg and the central axis of the first brace. By moving the position along the central axis, it is possible to prevent the first welding part and the second welding part from interfering with each other.

Therefore, it is possible to arrange the first brace such that the central axis of the first brace is located in a planar space in which the central axis of the first leg and the central axis of the first brace exist in the intersecting state. The second brace can be placed in a similar manner. Therefore, when processing the end surfaces of the first brace and the second brace to match the outer circumferential surface of the first leg, it is possible to make them line symmetrical with respect to the central axis of each of the first brace or the second brace. Therefore, processing of the end faces of the first brace and the second brace can be facilitated. In addition, by creating a structure in which the central axis of the first brace and the central axis of the second brace intersect with the central axis of the first leg, as described above, the structure of the jacket structure can be better adjusted to the conditions of structural analysis. It can be close. Therefore, the reliability of structural analysis can be further improved.
Further, for example, even if the outer diameters of the first brace and the second brace are increased, the first welded portion and the second welded portion can be prevented from interfering with each other. Therefore, the effect of reinforcing the jacket structure by the first brace and the second brace can be improved.

<10> The jacket structure according to aspect 10 of the present invention is the jacket structure according to any one of aspects 1 to 9, in which the tube axis of the first brace and the tube axis of the second brace are , when viewed along the longitudinal direction of the first leg with respect to the tube axis of the first leg as a reference, the first leg is line symmetrical.

According to this invention, the tube axis of the first brace and the tube axis of the second brace are line symmetrical when viewed along the longitudinal direction of the first leg with the tube axis of the first leg as a reference. Thereby, the structure of the jacket structure can be made simple. Therefore, for example, the efficiency of design consideration can be improved. The efficiency of manufacturing the jacket structure can be improved.

<11> The jacket structure according to aspect 11 of the present invention is the jacket structure according to any one of aspects 1 to 10, wherein the tube axis of each of the first brace and the second brace is It is characterized by the fact that the legs intersect when viewed along the longitudinal direction.

According to this invention, the respective tube axes of the first brace and the second brace intersect when viewed along the longitudinal direction of the first leg. This allows a structure in which the central axis of the first brace and the central axis of the second brace intersect with the central axis of the first leg, respectively.

<12> A jacket structure according to aspect 12 of the present invention is the jacket structure according to any one of aspects 1 to 11, further comprising a second leg that supports the offshore wind turbine and is tubular. The other end of the first brace is in contact with the second leg, and the tube axis of the first brace and the tube axis of the second leg intersect.

According to this invention, the tube axis of the first brace and the tube axis of the second leg intersect. As a result, for example, the position of the first brace is moved from the position of the first brace in the intersecting state to the intersection of the central axis of the first leg and the central axis of the first brace along the central axis of the first leg. In this position, the positional relationship between the second leg and the first brace can be made similar to the positional relationship between the first leg and the first brace. Therefore, the structure of the jacket structure can be made simple.

Furthermore, when processing the end faces of the first brace and the second brace to match the outer peripheral surface of the second leg, it is possible to make the end faces of the first brace and the second brace line symmetrical with respect to the central axis of each of the first brace and the second brace. Therefore, processing of the end faces of the first brace and the second brace can be facilitated. In addition, by creating a structure in which the central axis of the first brace and the central axis of the second brace intersect with the central axis of the second leg, as described above, the structure of the jacket structure can be more easily adjusted to the conditions of structural analysis. It can be close. Therefore, the reliability of structural analysis can be further improved.

<13> In the jacket structure according to aspect 13 of the present invention, in the jacket structure according to any one of aspects 1 to 12, the positions of one end of the first brace and one end of the second brace are are characterized by different characteristics when viewed along the horizontal direction.

According to this invention, the positions of one end of the first brace and one end of the second brace are different when viewed along the horizontal direction. In other words, the contact point between the first leg and the first brace and the contact point between the first leg and the second brace are at different positions in the vertical direction. With such a structure, the central axis of the first brace can be arranged so that it is located in a planar space where the central axis of the first leg and the central axis of the first brace exist in the intersecting state. Can be done. The second brace can be placed in a similar manner. Therefore, when processing the end surfaces of the first brace and the second brace to match the outer circumferential surface of the first leg, it is possible to make them line symmetrical with respect to the central axis of each of the first brace or the second brace. Therefore, processing of the end faces of the first brace and the second brace can be facilitated. In addition, by creating a structure in which the central axis of the first brace and the central axis of the second brace intersect with the central axis of the first leg, as described above, the structure of the jacket structure can be better adjusted to the conditions of structural analysis. It can be close. Therefore, the reliability of structural analysis can be further improved.

<14> In the jacket structure according to aspect 14 of the present invention, in the jacket structure according to any one of aspects 1 to 13, one end portion of each of the first brace and the second brace is in the intersecting state. It is characterized by overlapping.

According to this invention, one end portion of each of the first brace and the second brace overlaps in the intersecting state. In other words, if the outer diameters of the first brace and the second brace intersect, the first welded portion and the second welded portion will interfere with each other. Thereby, the outer diameters of the first brace and the second brace can be made sufficient. Therefore, the effect of reinforcing the jacket structure by the first brace and the second brace can be ensured.

<15> The jacket structure according to Aspect 15 of the present invention is the jacket structure according to any one of Aspects 1 to 14, wherein each of the first leg, the first brace, and the second brace is characterized by being linear.

According to the invention, each of the first leg, the first brace, and the second brace is straight. Thereby, the structure can be simplified compared to, for example, a case where each of the first leg, the first brace, and the second brace has a curved shape.

According to the present invention, it is possible to provide a jacket structure that can improve workability and sufficiently maintain the reinforcing effect.

It is a front view of a jacket structure. FIG. 2 is an enlarged view of a connecting member of the jacket structure shown in FIG. 1; FIG. 3 is a partial cross-sectional view of a predetermined portion as seen along the longitudinal direction of the leg. FIG. 6 is an enlarged view of a predetermined portion in an intersecting state. FIG. 3 is an enlarged view of a first form of a predetermined portion. FIG. 3 is a cross-sectional view of a portion of the predetermined portion according to the first form of the predetermined portion, as viewed along the longitudinal direction of the leg. FIG. 6 is an enlarged view of a second form of a predetermined portion. FIG. 7 is a cross-sectional view of a portion of the predetermined portion according to a second form of the predetermined portion, as viewed along the longitudinal direction of the leg.

(About the configuration of the jacket structure 100)
Hereinafter, a jacket structure 100 according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the jacket structure 100 supports an offshore wind turbine 200.
As shown in FIG. 1, the jacket structure 100 includes a transition piece 10, a leg 20, a steel pipe pile 30, a connecting member 40, and a brace 50.

Transition piece 10 is located on top of jacket structure 100. A lower end portion of an offshore wind turbine 200 is connected to the transition piece 10.
Legs 20 support transition piece 10. With this, the leg 20 supports the offshore wind turbine 200. The leg 20 is a tubular member. In the jacket structure 100, a plurality of legs 20 are provided. In this embodiment, four legs 20 are provided.

The lower end of the steel pipe pile 30 is driven into the seabed. The upper end of the steel pipe pile 30 is connected to the lower end of the leg 20. Thereby, the steel pipe pile 30 supports the leg 20. A plurality of steel pipe piles 30 are provided corresponding to the number of legs 20. The upper end of the steel pipe pile 30 and the lower end of the leg 20 are connected by a connecting member 40.

The connecting member 40 connects the leg 20 and the steel pipe pile 30 corresponding to the leg 20. The connecting member 40 includes an upper flange 41, a lower flange 42, and a sleeve 43, as shown in FIG.
The upper flange 41 and the lower flange 42 are plate-shaped members arranged at the upper and lower parts of the sleeve 43, respectively. The upper flange 41 and the lower flange 42 are each arranged horizontally, for example. As shown in FIG. 2, the upper flange 41 and the lower flange 42 are each attached to the lower end of the leg 20. For this reason, it is preferable that the leg 20 includes a bent portion 20B near the lower end. Thereby, it is preferable that the lower end of the leg 20 extends parallel to the vertical direction.

The sleeve 43 is a cylindrical member arranged along the vertical direction. As shown in FIG. 2, the upper and lower ends of the sleeve 43 are attached to an upper flange 41 and a lower flange 42, respectively. The steel pipe pile 30 is inserted into the sleeve 43 . Thereby, the leg 20 and the steel pipe pile 30 are connected by the connecting member 40.

The brace 50 connects adjacent legs 20 in the circumferential direction of the jacket structure 100 among the plurality of legs 20 provided in the jacket structure 100. The brace 50 thereby reinforces the jacket structure 100. Brace 50 includes a first brace 51 , a second brace 52 , and a first horizontal brace 53 . If these are not distinguished, they are referred to as braces 50.
In the following description, one of the plurality of legs 20 provided in the jacket structure 100 will be referred to as a first leg 21. The leg 20 located next to the first leg 21 in the circumferential direction of the jacket structure 100 is referred to as a second leg 22. The portion of the first leg 21 and the second leg 22 that the brace 50 comes into contact with is referred to as a predetermined portion LC.

One end of the first brace 51 abuts on a predetermined portion LC of the first leg 21 . The other end of the first brace 51 abuts on a predetermined portion LC of the second leg 22 . The first brace 51 is a tubular member.
One end of the second brace 52 abuts on a predetermined portion LC of the first leg 21 . The other end of the second brace 52 abuts on a predetermined portion LC of the second leg 22 . The second brace 52 is a tubular member.

In this embodiment, the first brace 51 and the second brace 52 are arranged in an X shape, as shown in FIG. In the jacket structure 100, the X-shape is provided in two stages in the vertical direction.
Here, as described above, four legs 20 are provided. At this time, in this embodiment, as shown in FIG. 3, the angle formed by the tube axis of the first brace 51 and the tube axis of the second brace 52 is approximately 90 degrees when viewed along the vertical direction. In this embodiment, approximately 90 degrees refers to a range of 65 degrees or more and 115 degrees or less.
In the following description, the braces 50 arranged in an X-shape in the jacket structure may be referred to as diagonal braces when the first braces 51, second braces 52, etc. are not distinguished.

The first horizontal brace 53 is connected to the predetermined portion LC. One end of the first horizontal brace 53 abuts on a predetermined portion LC of the first leg 21 . The other end of the first horizontal brace 53 abuts on a predetermined portion LC of the second leg 22 . The first horizontal brace 53 is a tubular member.
In this embodiment, the leg 20 and the brace 50 are joined by welding.

In this embodiment, the outer diameters of the steel pipe pile 30 or the first leg 21, the first brace 51 and the second brace 52, and the first horizontal brace 53 decrease in this order. That is, in the jacket structure 100, the outer diameter of the steel pipe pile 30 or the first leg 21 is the largest, and the outer diameter of the first horizontal brace 53 is the smallest. Moreover, the outer diameters of the first brace 51 and the second brace 52 are equal. In this embodiment, each of the first leg 21, the first brace 51, the second brace 52, and the first horizontal brace 53 is linear.

(Regarding the connection between leg 20 and brace 50)
Next, the connection between the leg 20 and the brace 50 in the jacket structure 100 according to the present embodiment will be described. First, the premises in each of the following explanations will be explained. In the following description, unless otherwise specified, the connection between the first leg 21 and the first brace 51 and the second brace 52 will be explained, but the connection between the leg 20 and the diagonal brace in the jacket structure 100 will be explained. The same applies to all parts.

The welded portion between the first leg 21 and the first brace 51 is referred to as a first welded portion W1. The welded portion between the first leg 21 and the second brace 52 is referred to as a second welded portion W2. When these are not distinguished, they are called welds.
In this embodiment, the predetermined portions LC are located at the upper end of the leg 20, the middle part of the leg 20, and the lower end of the leg 20, as shown in FIG. In the following description, the predetermined portion LC sandwiched between the upper flange 41 and the lower flange 42 of the connecting member 40 will be particularly described. Unless otherwise specified, the following aspects are the same for any predetermined portion LC located on the leg 20.

In explaining the predetermined portion LC of this embodiment, first, the intersecting state will be explained.
As shown in FIG. 4, a state where the tube axis of the first brace 51, the tube axis of the second brace 52, and the tube axis of the first leg 21 intersect at one point is called an intersecting state. One end portion of each of the first brace 51 and the second brace 52 overlaps in the intersecting state. As shown in FIG. 4, when the jacket structure 100 is configured such that the outer diameters of the first leg 21, the first brace 51, and the second brace 52 intersect, the outer diameters of the first leg 21, the first brace 51, and the second brace 52 intersect with each other. The condition is such that the second welded portion W2 interferes with the second welded portion W2. That is, the condition is such that the outline of the first welded part W1 and the outline of the second welded part W2 overlap.

(First form of predetermined portion LC)
In the first form of the predetermined portion LC, as shown in FIGS. 5 and 6, the tube axes of the first brace 51 and the second brace 52 are such that the distance between the first brace 51 and the second brace 52 intersects The distance between the first brace 51 and the second brace 52 is greater than the distance between the first brace 51 and the second brace 52. In this embodiment, the distance between the first brace 51 and the second brace 52 is the distance between the parts of the first brace 51 and the second brace 52 that are closest to each other. In this embodiment, the first brace 51 and the second brace 52 are arranged so as not to intersect. This prevents the first welded portion W1 and the second welded portion W2 from interfering with each other. In this case, the length of the predetermined portion LC is the same as in the intersecting state.

As shown in FIG. 6, the tube axis of the first brace 51 and the tube axis of the second brace 52 are based on the tube axis of the first leg 21 and viewed along the longitudinal direction of the first leg 21. It is symmetrical.
In the first form of the predetermined portion LC, the tube axes of the first brace 51 and the second brace 52 do not intersect with the tube axis of the first leg 21 . That is, as shown in FIGS. 5 and 6, the first brace 51 and the second brace 52 are moved from the position of the first brace 51 and the second brace 52 in the intersecting state shown in FIGS. 3 and 4 to the jacket structure 100. It is located at the part that has been translated outward. Thereby, the tube axis of the first brace 51 and the tube axis of the second brace 52 are positioned parallel to the tube axes of the first brace 51 and the second brace 52 in the intersecting state when viewed from the longitudinal direction of the legs. do. In this case, the movement distance is preferably such that the minimum distance between the first welding part W1 and the second welding part W2 is 50 mm or more, for example. This prevents interference between the first welded portion W1 and the second welded portion W2.

As shown in FIGS. 5 and 6, the tube axes of the first brace 51 and the second brace 52 intersect. Moreover, as shown in FIG. 5, the tube axis of the first horizontal brace 53 and the tube axis of the first leg 21 intersect.
Here, as described above, the connection between the second leg 22, the first brace 51, and the second brace 52 is the same as the connection between the first leg 21, the first brace 51, and the second brace 52. That is, in the first form of the predetermined portion LC, the tube axes of the first brace 51 and the second brace 52 do not intersect with the tube axis of the second leg 22 .

(Second form of predetermined portion LC)
Next, a second form of the predetermined portion LC will be explained. In the following, only the contents different from the first embodiment will be explained. Other contents are the same as the first form.
The tube axes of the first brace 51 and the second brace 52 do not intersect. That is, as shown in FIG. 7, the position of the first brace 51 is changed from the position of the first brace 51 in the intersecting state shown in FIGS. 3 and 4 to the central axis of the first leg 21 and the central axis of the first brace 51. Let the intersection point be the position moved along the central axis of the first leg 21. That is, the positions of one end of the first brace 51 and one end of the second brace 52 are different when viewed along the horizontal direction. In this case, the movement distance is preferably such that the minimum distance between the first welding part W1 and the second welding part W2 is 50 mm or more, for example. This prevents the first welded portion W1 and the second welded portion W2 from interfering with each other. In such a configuration, the length of the predetermined portion LC is longer than in the intersecting state.

In the second form, as shown in FIG. 7, the tube axis of the first brace 51 and the tube axis of the first leg 21 intersect, and the tube axis of the second brace 52 and the tube axis of the first leg 21 intersect with each other. . Therefore, as shown in FIG. 8, the tube axes of the first brace 51 and the second brace 52 intersect when viewed along the longitudinal direction of the first leg 21.
Here, as described above, the connection between the leg 20 and the diagonal brace in the jacket structure 100 is the same in all parts. That is, in the second form of the predetermined portion LC, the tube axes of the first brace 51 and the second brace 52 intersect with the tube axis of the second leg 22 .
In the above points, the second form of the predetermined portion LC is different from the first form.

As explained above, according to the jacket structure 100 according to the present embodiment, the tube axes of the first brace 51 and the second brace 52 are arranged such that the distance between the first brace 51 and the second brace 52 intersects. is arranged so that the distance is greater than the distance at . Thereby, the first welded portion W1 and the second welded portion W2 can be made less likely to interfere with each other than when they intersect. Therefore, the work of welding the first leg 21, the first brace 51, and the second brace 52 can be facilitated. Therefore, workability can be improved. Therefore, welding reliability can be improved. Additionally, costs can be reduced.

By adopting the above-mentioned aspect, for example, by reducing the diameters of the first brace 51 and the second brace 52 while maintaining the intersecting state, the first welding part W1 and the second welding part W2 can be prevented from interfering with each other. Compared to the case where this is the case, the effect of reinforcing the jacket structure 100 by the first brace 51 and the second brace 52 can be sufficiently maintained.

Moreover, the angle formed by the tube axis of the first brace 51 and the tube axis of the second brace 52 is approximately 90 degrees when viewed along the vertical direction. Thereby, for example, when the jacket structure 100 includes four legs 20, the jacket structure 100 can have a square shape in plan view. Therefore, the jacket structure 100 can have a stable structure.

Further, the tube axis of the first horizontal brace 53 and the tube axis of the first leg 21 intersect. Here, for the structural analysis of the jacket structure 100, analysis using a beam model, that is, a simplified model in which only the neutral axis of each structure is extracted and simplified, is preferably used. Therefore, in order to make the jacket structure 100 have a structure closer to the analysis conditions, it is preferable that the tube axes of the tubular members constituting the jacket structure 100 intersect. On the other hand, the tube axis of the first horizontal brace 53 and the tube axis of the first leg 21 intersect. In the case of such an embodiment, the structure of the jacket structure 100 can be made closer to the conditions of structural analysis. Therefore, the reliability of structural analysis can be further improved.

Further, the predetermined portion LC is sandwiched between the upper flange and the lower flange of the connecting member 40. That is, between the upper flange and the lower flange of the connecting member 40, the tube axes of the first brace 51 and the second brace 52 are such that the distance between the first brace 51 and the second brace 52 is the same as the distance when the first brace 51 and the second brace 52 intersect. It is arranged so that it becomes larger. Thereby, between the upper flange and the lower flange of the connecting member 40, it is possible to prevent the first welded portion W1 and the second welded portion W2 from interfering with each other. Therefore, the work of welding the first leg 21 and the first brace 51 and the second brace 52 between the upper flange and the lower flange of the connecting member 40 can be facilitated.

Further, the outer diameters of the steel pipe pile 30 or the first leg 21, the first brace 51, and the first horizontal brace 53 become smaller in this order. That is, among the components of the jacket structure 100, the steel pipe pile 30 or the first leg 21 is the thickest, and the first horizontal brace 53 is the thinnest. With such a structure, it is possible to maintain the necessary strength of the jacket structure 100 and improve economic efficiency.

Further, the tube axes of the first brace 51 and the second brace 52 do not intersect with the tube axis of the first leg 21 . With this structure, the positions of the first brace 51 and the second brace 52 are moved in parallel toward the outside of the jacket structure 100 from the positions of the first brace 51 and the second brace 52 in the intersecting state. By setting the position, it is possible to prevent the first welding part W1 and the second welding part W2 from interfering with each other. Thereby, for example, even if the outer diameters of the first brace 51 and the second brace 52 are increased, the first welded portion W1 and the second welded portion W2 can be prevented from interfering with each other. Therefore, the effect of reinforcing the jacket structure 100 by the first brace 51 and the second brace 52 can be improved.

Further, the tube axes of the first brace 51 and the second brace 52 intersect. As a result, when the positions of the first brace 51 and the second brace 52 are moved in parallel toward the outside of the jacket structure 100 from the positions of the first brace 51 and the second brace 52 in the intersecting state, When viewed along the longitudinal direction of the first leg 21, the first brace 51 and the second brace 52 can be provided line-symmetrically. Therefore, the structure of the jacket structure 100 can be made simple.

Further, the other end of the first brace 51 is in contact with the second leg 22, and the tube axis of the first brace 51 and the tube axis of the second leg 22 do not intersect. With this, for example, when the position of the first brace 51 is moved in parallel toward the outside of the jacket structure 100 from the position of the first brace 51 in the intersecting state, the second leg 22 and the first brace 51 The positional relationship between the first leg 21 and the first brace 51 can be made similar to the positional relationship between the first leg 21 and the first brace 51. Therefore, the structure of the jacket structure 100 can be made simple.

Further, the tube axes of the first brace 51 and the second brace 52 do not intersect. With such a structure, for example, the position of the first brace 51 can be changed from the position of the first brace 51 in the intersecting state to the intersection of the central axis of the first leg 21 and the central axis of the first brace 51, By moving the position along the central axis of the first leg 21, it is possible to prevent the first welding part W1 and the second welding part W2 from interfering with each other.

Therefore, it is possible to arrange the first brace 51 such that the central axis of the first brace 51 is located in a planar space where the central axis of the first leg 21 and the central axis of the first brace 51 in the intersecting state exist. The second brace 52 can be arranged in a similar manner. Therefore, when processing the end surfaces of the first brace 51 and the second brace 52 to match the outer circumferential surface of the first leg 21, it is possible to make them line symmetrical with respect to the central axis of the first brace 51 or the second brace 52, respectively. can. Therefore, the end faces of the first brace 51 and the second brace 52 can be easily processed. Further, by having a structure in which the central axis of the first brace 51 and the central axis of the second brace 52 intersect with the central axis of the first leg 21, the structure of the jacket structure 100 can be improved as described above. The conditions can be made close to the analysis conditions. Therefore, the reliability of structural analysis can be further improved.
Furthermore, for example, even if the outer diameters of the first brace 51 and the second brace 52 are increased, the first welded portion W1 and the second welded portion W2 can be prevented from interfering with each other. Therefore, the effect of reinforcing the jacket structure 100 by the first brace 51 and the second brace 52 can be improved.

Further, the tube axis of the first brace 51 and the tube axis of the second brace 52 are line symmetrical when viewed along the longitudinal direction of the first leg 21 with the tube axis of the first leg 21 as a reference. Thereby, the structure of the jacket structure 100 can be made simple. Therefore, for example, the efficiency of design consideration can be improved. The efficiency of manufacturing the jacket structure 100 can be improved.

Further, the tube axes of the first brace 51 and the second brace 52 intersect when viewed along the longitudinal direction of the first leg 21. This allows a structure in which the central axis of the first brace 51 and the central axis of the second brace 52 intersect with the central axis of the first leg 21, respectively.

Further, the tube axis of the first brace 51 and the tube axis of the second leg 22 intersect. Thereby, for example, the position of the first brace 51 can be changed from the position of the first brace 51 in the intersecting state to the intersection of the central axis of the first leg 21 and the central axis of the first brace 51 to the center of the first leg 21. When the position is moved along the axis, the positional relationship between the second leg 22 and the first brace 51 can be made similar to the positional relationship between the first leg 21 and the first brace 51. Therefore, the structure of the jacket structure 100 can be made simple.

Furthermore, when processing the end surfaces of the first brace 51 and the second brace 52 to match the outer peripheral surface of the second leg 22, it is possible to make them line symmetrical with respect to the central axis of the first brace 51 or the second brace 52, respectively. can. Therefore, the end faces of the first brace 51 and the second brace 52 can be easily processed. Further, by having a structure in which the central axis of the first brace 51 and the central axis of the second brace 52 intersect with the central axis of the second leg 22, the structure of the jacket structure 100 can be improved as described above. The conditions can be made close to the analysis conditions. Therefore, the reliability of structural analysis can be further improved.

Furthermore, the positions of one end of the first brace 51 and one end of the second brace 52 are different when viewed along the horizontal direction. In other words, the contact point between the first leg 21 and the first brace 51 and the contact point between the first leg 21 and the second brace 52 are at different positions in the vertical direction. With such a structure, the central axis of the first brace 51 is positioned in a planar space where the central axis of the first leg 21 and the central axis of the first brace 51 exist in the intersecting state. can be placed. The second brace 52 can be arranged in a similar manner. Therefore, when processing the end surfaces of the first brace 51 and the second brace 52 to match the outer circumferential surface of the first leg 21, it is possible to make them line symmetrical with respect to the central axis of the first brace 51 or the second brace 52, respectively. can. Therefore, the end faces of the first brace 51 and the second brace 52 can be easily processed. Further, by having a structure in which the central axis of the first brace 51 and the central axis of the second brace 52 intersect with the central axis of the first leg 21, the structure of the jacket structure 100 can be improved as described above. The conditions can be made close to the analysis conditions. Therefore, the reliability of structural analysis can be further improved.

Further, one end portion of each of the first brace 51 and the second brace 52 overlaps in the intersecting state. That is, when the outer diameters of the first brace 51 and the second brace 52 intersect, the first welded portion W1 and the second welded portion W2 are in a condition to interfere with each other. Thereby, the outer diameters of the first brace 51 and the second brace 52 can be made sufficient. Therefore, the effect of reinforcing the jacket structure 100 by the first brace 51 and the second brace 52 can be ensured.

Moreover, each of the first leg 21, the first brace 51, and the second brace 52 is linear. Thereby, the structure can be simplified compared to, for example, a case where each of the first leg 21, the first brace 51, and the second brace 52 has a curved shape.

Note that the technical scope of the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention.
For example, although it has been explained that the X-shape formed by the first brace 51 and the second brace 52 is provided in two stages in the vertical direction, the X-shape may be provided in only one stage in the vertical direction, or More than one stage may be provided.
Although it has been explained that the outer diameters of the steel pipe pile 30 or the first leg 21, the first brace 51 and the second brace 52, and the first horizontal brace 53 decrease in this order, the outer diameter of the first horizontal brace 53 is , may be larger than the outer diameters of the first brace 51 and the second brace 52. Further, the size relationship between the steel pipe pile 30 and the first leg 21 may be reversed. That is, the outer diameter of the first leg 21 may be larger than the outer diameter of the steel pipe pile 30.
Although it has been described that four legs 20 are provided in the jacket structure 100, there may be three, or five or more legs 20. Correspondingly, in the jacket structure 100, the number of steel pipe piles 30 may be three, or five or more.

In addition, without departing from the spirit of the present invention, the components in the embodiments described above may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate.

LC Predetermined portion 10 Transition piece 20 Leg 21 First leg 22 Second leg 30 Steel pipe pile 40 Connection member 50 Brace 51 First brace 52 Second brace 53 First horizontal brace 100 Jacket structure 200 Offshore wind turbine

Claims (15)

a first leg supporting an offshore wind turbine and having a tubular shape;
a brace whose one end abuts a predetermined portion of the first leg and is tubular;
A jacket structure comprising:
The brace includes a first brace and a second brace,
A state in which the tube axis of the first brace, the tube axis of the second brace, and the tube axis of the first leg intersect at one point is defined as an intersecting state;
The tube axes of the first brace and the second brace are arranged such that the distance between the first brace and the second brace is greater than the distance in the intersecting state.
A jacket structure characterized by: The angle formed by the tube axis of the first brace and the tube axis of the second brace is approximately 90 degrees when viewed along the vertical direction.
The jacket structure according to claim 1, characterized in that: a first horizontal brace connected to the predetermined portion and having a tubular shape;
further comprising;
one end of the first horizontal brace is in contact with the predetermined portion,
the tube axis of the first horizontal brace and the tube axis of the first leg intersect;
The jacket structure according to claim 2, characterized in that: Multiple steel pipe piles are driven into the seabed,
a connecting member that connects the first leg and the steel pipe pile corresponding to the first leg;
an upper flange included in the connecting member;
a lower flange included in the connecting member;
further comprising;
the predetermined portion is sandwiched between the upper flange and the lower flange;
The jacket structure according to claim 3, characterized in that: The outer diameter of each of the steel pipe pile or the first leg, the first brace, and the first horizontal brace decreases in this order,
The jacket structure according to claim 4, characterized in that: tube axes of the first brace and the second brace do not intersect with the tube axis of the first leg;
The jacket structure according to claim 5, characterized in that: The respective tube axes intersect,
The jacket structure according to claim 6, characterized in that: a second leg supporting the offshore wind turbine and having a tubular shape;
further comprising;
The other end of the first brace is in contact with the second leg,
the tube axis of the first brace and the tube axis of the second leg do not intersect;
The jacket structure according to claim 7, characterized in that: The tube axes of the first brace and the second brace do not intersect,
The jacket structure according to claim 5, characterized in that: The tube axis of the first brace and the tube axis of the second brace are line symmetrical when viewed along the longitudinal direction of the first leg with the tube axis of the first leg as a reference.
The jacket structure according to claim 9, characterized in that: The tube axes of the first brace and the second brace intersect when viewed along the longitudinal direction of the first leg,
The jacket structure according to claim 9, characterized in that: a second leg supporting the offshore wind turbine and having a tubular shape;
further comprising;
The other end of the first brace is in contact with the second leg,
The tube axis of the first brace and the tube axis of the second leg intersect,
The jacket structure according to claim 11. The positions of one end of the first brace and one end of the second brace are different when viewed along the horizontal direction,
13. The jacket structure according to claim 12. one end portion of each of the first brace and the second brace overlaps in the intersecting state;
The jacket structure according to any one of claims 1 to 13, characterized in that: each of the first leg, the first brace, and the second brace is linear;
The jacket structure according to any one of claims 1 to 13, characterized in that:

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