JP2023178169A - jacket structure - Google Patents

Abstract

[Problem] An object of the present invention is to provide a jacket structure that does not require long piles and can be easily constructed on a hoist ship.
SOLUTION: A jacket structure 100 according to an aspect 1 of the present invention includes a first jacket structure 10 that supports a tower of an offshore wind turbine W and has three or more first legs 11; A jacket structure 100 comprising: a second jacket structure 20 supporting a body 10 and having three or more second legs 21; One of the two legs 21 is characterized in that a corresponding one of the other legs is inserted inside each leg.
[Selection diagram] Figure 2

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 in which a plurality of jacket units are joined to a steel pipe pile driven into an underwater foundation and are integrated using a wedge material.
Patent Document 2 discloses a structure in which a plurality of jacket structures are inserted into a foundation pile installed in a water area, the plurality of jacket structures are welded together, and then a filler is filled to join the jacket structures. There is.
In Patent Document 3, when a plurality of jacket structures are inserted into a foundation pile installed in a water area, and the jacket structures are joined by filling with filler, a bottom formwork is provided on the foundation pile. A structure that does not require welding between structures is disclosed.

Japanese Unexamined Patent Publication No. 19808-1988 Japanese Patent Application Publication No. 2005-133483 Japanese Patent Application Publication No. 2005-133485

As offshore wind turbines become larger, there is a need for larger jacket structures. As the jacket structure increases in size, if it becomes impossible to perform all-in-one construction using a construction vessel such as a crane boat, it is necessary to manufacture the jacket structure in parts and combine them at the construction site. Here, in the above-mentioned conventional technology, the legs of the jacket structure in multiple stages are attached to one of the piles driven in the vertical direction in the axial direction of the pile. Therefore, when increasing the size of the jacket structure, it is necessary to increase the length of the piles. Therefore, there are problems with the manufacturability and transportability of the piles. In addition, the hoisting capacity and lifting height of the hoist ship are limited.

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 does not require long piles and can be easily constructed on a hoist ship.

<1> A jacket structure according to aspect 1 of the present invention includes a first jacket structure having three or more first legs, and a first jacket structure supporting the first jacket structure and having three or more second legs. a second jacket structure comprising a second jacket structure, wherein one of the three or more first legs and the three or more second legs corresponds to the inside of each of the other legs. It is characterized by the fact that what is inserted is inserted.

According to this invention, the corresponding one of the three or more first legs and the three or more second legs is inserted into each interior. In other words, the second leg is inserted inside the first leg. Alternatively, the first leg is inserted inside the second leg. Thereby, the first jacket structure and the second jacket structure can be brought into a state where they can be joined. Therefore, for example, the structure described in the above-mentioned prior art, in which a plurality of legs having a jacket structure is attached to one long pile driven in the vertical direction in the axial direction of the long pile Compared to this, it is possible to eliminate the need for long stakes. Therefore, the transportability of the foundation pile can be improved. Furthermore, construction using a crane ship can be facilitated. This aspect can bring about particularly remarkable effects when constructing a large-sized jacket structure.
Furthermore, when forming the jacket structure, the first jacket structure and the second jacket structure are transported in a divided state and joined at the construction site, thereby improving the transportability and workability of the jacket structure. be able to.

According to the present invention, it is possible to provide a jacket structure that does not require long piles and can be easily constructed on a hoist ship.

FIG. 1 is a perspective view of a jacket structure according to the present invention. FIG. 2 is a front view of the first example of the jacket structure shown in FIG. 1; FIG. 2 is a front view of a second example of the jacket structure shown in FIG. 1; FIG. 2 is a cross-sectional view of a first example of a joint between a first leg and a second leg. FIG. 3 is a cross-sectional view of a second example of a joint between a first leg and a second leg. It is a sectional view of the joint part of a 2nd leg and a steel pipe pile. This is a modification of the jacket structure shown in FIG. 2. This is a modification of the jacket structure shown in FIG. 3.

(Regarding each 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. The jacket structure 100 is used, for example, to support a wind turbine installed on the ocean (offshore wind turbine W). The jacket structure 100 is supported by being joined to a steel pipe pile P driven into the seabed.
As shown in FIG. 1, the jacket structure 100 includes a first jacket structure 10 (upper jacket) and a second jacket structure 20 (lower jacket).

The first jacket structure 10 is provided above the jacket structure 100. The first jacket structure 10 supports the tower (leg portion) of the offshore wind turbine W. For example, a transition piece TP is arranged on the top of the first jacket structure 10. The tower of the offshore wind turbine W is connected to the transition piece TP. Thereby, the first jacket structure 10 supports the tower of the offshore wind turbine W.

The first jacket structure 10 includes a plurality of first legs 11, a plurality of diagonal braces 30, and a plurality of horizontal members 40 (a plurality of first horizontal members 41 or a plurality of second horizontal members 42). have The first leg 11 is a main component that becomes a leg portion of the first jacket structure 10. The first leg 11 is formed of, for example, a steel pipe. In the first jacket structure 10, three or more first legs 11 are provided. In this embodiment, four first legs 11 are provided.

In the first jacket structure 10, the diagonal brace 30 includes one of the plurality of first legs 11 and one different from one of the first legs 11 described above, as shown in FIG. 2 or 3. , connect. For example, the diagonal brace 30 connects the first legs 11 adjacent to each other in the circumferential direction of the first jacket structure 10 with the vertical direction as an axis.

The diagonal brace 30 is formed of, for example, a steel pipe. The diagonal brace 30 is arranged diagonally between the plurality of first legs 11 in the first jacket structure 10 . Only one diagonal brace 30 may be arranged between the plurality of first legs 11. In this embodiment, two diagonal braces 30 are arranged in an X-shape between the plurality of first legs 11.

The horizontal member 40 includes a first horizontal member 41 and a second horizontal member 42. In the first jacket structure 10, as shown in FIG. 2 or 3, one of the plurality of first legs 11 is connected to a different one of the first legs 11 described above. For example, the horizontal member 40 connects the first legs 11 adjacent to each other in the circumferential direction of the first jacket structure 10 with the vertical direction as an axis.
The horizontal members 40 (first horizontal member 41, second horizontal member 42) are formed of, for example, steel pipes. The horizontal member 40 differs from the diagonal brace 30 in that it is arranged horizontally between the plurality of first legs 11 .

The second jacket structure 20 is provided below the first jacket structure 10. The second jacket structure 20 supports the first jacket structure 10. Specifically, the lower end of the first jacket structure 10 and the upper end of the second jacket structure 20 are joined. The lower end of the second jacket structure 20 is joined to a steel pipe pile P, for example. Thereby, the second jacket structure 20 supports the first jacket structure 10.

The second jacket structure 20 includes a plurality of second legs 21, a plurality of diagonal braces 30, and a plurality of horizontal members 40. The second leg 21 is the main component that becomes the leg of the second jacket structure 20. The second leg 21 is formed of, for example, a steel pipe. In the second jacket structure 20, three or more second legs 21 are provided. In this embodiment, four second legs 21 are provided.

The number of first legs 11 of first jacket structure 10 and second legs 21 of second jacket structure 20 is the same. Further, the positions of the plurality of first legs 11 and the positions of the plurality of second legs 21 are arranged to correspond to each other.
The number of second legs 21 of the second jacket structure 20 and the number of steel pipe piles P are the same. That is, in this embodiment, three or more steel pipe piles P are provided. In this embodiment, four steel pipe piles P are provided. Further, the positions of the plurality of second legs 21 and the plurality of steel pipe piles P are arranged to correspond to each other.

In the second jacket structure 20, the diagonal brace 30 includes one of the plurality of second legs 21 and one different from one of the second legs 21 described above, as shown in FIG. 2 or 3. Connect. For example, the diagonal brace 30 connects the second legs 21 that are adjacent to each other in the circumferential direction of the second jacket structure 20 with the vertical direction as an axis.

The diagonal brace 30 is arranged diagonally between the plurality of second legs 21 in the second jacket structure 20 . Only one diagonal brace 30 may be arranged between the plurality of second legs 21. In this embodiment, two diagonal braces 30 are arranged in an X-shape between the plurality of second legs 21.

In the second jacket structure 20, the horizontal member 40 includes one of the plurality of second legs 21 and one different from one of the second legs 21 described above, as shown in FIG. 2 or 3. may be connected. For example, the horizontal member 40 connects the second legs 21 adjacent to each other in the circumferential direction of the second jacket structure 20 with the vertical direction as an axis.
The horizontal member 40 differs from the diagonal brace 30 in that it is arranged horizontally between the plurality of second legs 21.

(About joining the first jacket structure 10, second jacket structure 20, and steel pipe pile P)
The first jacket structure 10 and the second jacket structure 20 are joined by joining the first legs 11 and the second legs 21 at corresponding positions.
The first leg 11 and the second leg 21 are joined, for example, by inserting and fixing the end of the second leg 21 inside the first leg 11. The first leg 11 and the second leg 21 may be joined by inserting and fixing the end of the first leg 11 inside the second leg 21.

In this embodiment, one of the first leg 11 and the second leg 21 into which the other member is inserted is referred to as one. Of the first leg 11 and the second leg 21, the one inserted into the other member is referred to as the other leg. That is, inside one of the first leg 11 and the second leg 21, the corresponding one (the second leg 21 or the first leg 11) is inserted.
In addition, in this embodiment, the plurality of first legs 11 and the plurality of second legs 21 are collectively called from the viewpoint of whether a partner member is inserted or whether they are inserted into a partner member. When doing so, each of the plurality of first legs 11 and each of the plurality of second legs 21 may be referred to as "one of the legs,""the other leg," or the like.

In this embodiment, a portion of each of the two into which the corresponding one is inserted and a portion of each of the other into which the corresponding one of the two is inserted are joined with grout. That is, the first leg 11 and the second leg 21 are joined by grout. Grout is something that is filled between members to be joined and hardens after filling to join the members together. For example, mortar or cement paste is used for grout.

The second jacket structure 20 and the steel pipe pile P are joined by joining the second legs 21 and the steel pipe pile P at corresponding positions.
The second leg 21 and the steel pipe pile P are joined by inserting and fixing the end of the second leg 21 inside the steel pipe pile P. This aspect is the same whether the second leg 21 is on one side or the other side.
In this embodiment, of each of the second legs 21, which are either one or the other, the portion to be inserted into the corresponding one of the steel pipe piles P driven into the seabed ground, and the portion of each of the steel pipe piles P , and the portion into which the corresponding one of the second legs 21, which is one or the other, is inserted, are joined with grout. That is, the second leg 21 and the steel pipe pile P are joined by grout. The second leg 21 and the steel pipe pile P may be joined by welding.

In this embodiment, the outer diameter of each of the second legs 21, which is either one or the other, is smaller than the inner diameter of each of the steel pipe piles P. The inner diameter of one of the first leg 11 and the second leg 21 is larger than the outer diameter of the other.
Further, the difference between the inner diameter of each of the steel pipe piles P and the outer diameter of each of the second legs 21, which is either one or the other, is defined as the first interval. The difference between the inner diameter of one of the first leg 11 and the second leg 21 and the outer diameter of the other leg is defined as a second interval. At this time, the first interval is larger than the second interval.

(About the detailed structure of the jacket structure 100)
The jacket structure 100 has a first vertical portion V1, a second vertical portion V2, a third vertical portion V3, a fourth vertical portion V4, a first sloped portion S1, and a second sloped portion S2. .
The first vertical portion V1 is a portion into which a corresponding one of the first leg 11 and the second leg 21 is inserted. The first vertical portion V1 extends along the vertical direction. That is, when the first leg 11 is one side, the first vertical portion V1 is a portion of the first leg 11 that extends vertically, as shown in FIG. When the second leg 21 is one side, the first vertical portion V1 is a portion of the second leg 21 that extends vertically, as shown in FIG.

The second vertical portion V2 is a portion inserted into the corresponding one of the first leg 11 and the second leg 21, respectively. The second vertical portion V2 extends along the vertical direction. That is, when the first leg 11 is the other leg, the second vertical portion V2 is a portion of the first leg 11 that extends vertically, as shown in FIG. When the second leg 21 is the other leg, the second vertical portion V2 is a portion of the second leg 21 that extends vertically, as shown in FIG.

In this embodiment, as shown in FIG. 4 or 5, the first leg 11, which is either the first vertical portion V1 or the second vertical portion V2, is provided with a first contact member 11C. The first abutting member 11C abuts on the second leg 21, which is not either the first vertical portion V1 or the second vertical portion V2. Thereby, the first contact member 11C regulates the amount of insertion between one of the first leg 11 and the second leg 21 and the other.

When the first contact member 11C is attached to the first vertical portion V1, that is, when the first leg 11 that is one of the first leg 11 and the second leg 21 is inserted into the second leg 21 that is the other one, As shown in FIG. 4, the first contact member 11C is arranged on the inner circumferential surface of the first leg 11. As shown in FIG.
When the first contact member 11C is the second vertical portion V2, that is, when the other one of the first leg 11 and the second leg 21 is inserted into the second leg 21, As shown in FIG. 5, the first contact member 11C is arranged on the outer peripheral surface of the first leg 11. As shown in FIG.

The first contact member 11C includes a first flange 11Cf and a first rib 11Cr, as shown in FIG. 4 or 5. The first flange 11Cf is an annular member that comes into contact with the upper end of the second leg 21. The first flange 11Cf is attached to the first leg 11 by welding, for example. The first flange 11Cf does not need to be welded to the first leg 11. The first rib 11Cr is a plate-shaped member disposed between the first flange 11Cf and the outer peripheral surface or inner peripheral surface of the first leg 11. The first rib 11Cr is reinforced by the first flange 11Cf.
When joining the first leg 11 and the second leg 21, one is inserted into the other until the first contact member 11C contacts the second leg 21. Thereafter, grout is filled into the joint between one side and the other and fixed by hardening.

The third vertical portion V3 is a portion inserted into a corresponding one of the steel pipe piles P of each of the second legs 21, which is either one or the other. The third vertical portion V3 extends along the vertical direction. That is, as shown in FIG. 2 or 3, the third vertical portion V3 is a portion extending along the vertical direction at the lower end of the second leg 21.
The fourth vertical portion V4 is a portion into which a corresponding one of the second legs 21, which is either one or the other of the steel pipe piles P, is inserted. The fourth vertical portion V4 extends along the vertical direction. That is, as shown in FIG. 2 or 3, the fourth vertical portion V4 is a portion where the steel pipe pile extends along the vertical direction, including the upper end of the steel pipe pile P.

As shown in FIG. 6, a second abutting member 21C is provided in the third vertical portion V3. The second contact member 21C contacts the upper end of the fourth vertical portion V4. Thereby, the second contact member 21C regulates the amount of insertion between the second leg 21 and the steel pipe pile P. As shown in FIG. 6, the second contact member 21C is arranged on the outer circumferential surface of the second leg 21. As shown in FIG.

As shown in FIG. 6, the second contact member 21C includes a second flange 21Cf and a second rib 21Cr. The second flange 21Cf is an annular member that comes into contact with the upper end of the steel pipe pile P. The second flange 21Cf is attached to the second leg 21 by, for example, welding. The second flange 21Cf does not need to be welded to the second leg 21. The second rib 21Cr is a plate-shaped member disposed between the second flange 21Cf and the outer peripheral surface of the second leg 21. The second rib 21Cr is reinforced by the second flange 21Cf.
When joining the second legs 21 to the second legs 21, one is inserted into the other until the second abutment member 21C abuts the second leg 21. Thereafter, grout is filled into the joint between one side and the other and fixed by hardening.

The first inclined portion S1 is a portion different from a portion into which a corresponding one of the first leg 11 and the second leg 21 is inserted. That is, when the first leg 11 is one side, the first inclined portion S1 is the inclined portion of the first leg 11, as shown in FIG. When the second leg 21 is one side, the first inclined portion S1 is the inclined portion of the second leg 21, as shown in FIG. The first sloped portion S1 is sloped such that the lower end of the first sloped portion S1 is farther from the tower than the upper end of the first sloped portion S1 when viewed along the vertical direction.

The second inclined portion S2 is a portion that is different from the portion inserted into the corresponding one of the first leg 11 and the second leg 21, respectively. That is, when the first leg 11 is the other one, the second inclined portion S2 is the inclined portion of the first leg 11, as shown in FIG. When the second leg 21 is the other one, the second inclined portion S2 is the inclined portion of the second leg 21, as shown in FIG. The second sloped portion S2 is sloped such that the lower end of the second sloped portion S2 is farther from the tower than the upper end of the second sloped portion S2 when viewed along the vertical direction.
In this way, by forming the first jacket structure 10 and the second jacket structure 20 to become larger from above to below by the first slope portion S1 and the second slope portion S2, the jacket structure 100 This contributes to improving the stability of the system.

The horizontal member 40 includes a first horizontal member 41 and a second horizontal member 42. The first horizontal member 41 and the second horizontal member 42 are arranged at different positions as described below.
The first horizontal member 41 is arranged as follows, for example. That is, the vicinity of the upper end or the vicinity of the lower end of the first vertical portion V1 corresponding to one of the first leg 11 and the second leg 21, and the one corresponding to the one different from the one of the first legs V1. It is arranged so as to connect the vicinity of the upper end or the vicinity of the lower end of the first vertical portion V1.

More specifically, when the first leg 11 is one, the first horizontal member 41 is located near the upper end of the first vertical portion V1 corresponding to one of the first legs 11, and It is arranged so as to connect the vicinity of the upper end of the first vertical portion V1 corresponding to the different one. When there is one second leg 21, the first horizontal member 41 corresponds to the vicinity of the lower end of the first vertical portion V1 corresponding to one of the second legs 21 and to one different from the one above. It is arranged so as to connect the vicinity of the lower end of the first vertical portion V1.

The second horizontal member 42 is arranged as follows, for example. That is, the vicinity of the upper end or the vicinity of the lower end of the second inclined part S2 corresponding to one of the other one of the first leg 11 and the second leg 21, and the other one corresponding to the other one different from the one mentioned above. It is arranged so as to connect the vicinity of the upper end or the vicinity of the lower end of the second inclined portion S2.

More specifically, when the first leg 11 is the other one, the second horizontal member 42 is located near the lower end of the second inclined portion S2 corresponding to one of the first legs 11 and It is arranged so as to connect the lower end portions of the second inclined portions S2 corresponding to the different one. When the second leg 21 is the other one, the second horizontal member 42 corresponds to the vicinity of the upper end of the second inclined portion S2 corresponding to one of the second legs 21 and to one different from the one mentioned above. It is arranged so as to connect the vicinity of the upper end of the second inclined portion S2.

In the jacket structure 100, only one of the first horizontal member 41 and the second horizontal member 42 may be provided, both may be provided, or neither of the first horizontal member 41 and the second horizontal member 42 may be provided. When providing only either the first horizontal member 41 or the second horizontal member 42, it is preferable to provide only the first horizontal member 41. This is because by not providing the second horizontal member 42, the jacket structure 100 can be vibrated at a desired frequency in response to vibrations input from the offshore wind turbine.

As described above, the diagonal brace 30 connects one of the plurality of first legs 11 to a different one of the first legs 11 described above. Alternatively, the diagonal brace 30 connects one of the plurality of second legs 21 and one different from one of the second legs 21 described above.
More specifically, the diagonal brace 30 connects one of the first leg 11 and the second leg 21 to a different leg.

At this time, the diagonal brace 30 is arranged to overlap with one inserted into a different one of the first leg 11 and the second leg 21, for example, when viewed along the horizontal direction. That is, the end of the diagonal brace 30 is connected to the joint with the other of the first leg 11 and the second leg 21.
As shown in FIGS. 7 and 8, the diagonal braces 30 may be arranged so as not to overlap those inserted into different ones of the others when viewed along the horizontal direction. That is, the end of the diagonal brace 30 may be connected to a portion other than the joint with the other of the first leg 11 and the second leg 21.

Further, a diagonal brace 30 that connects the first inclined portion S1 corresponding to one of the first legs 11 and the first inclined portion S1 corresponding to a different one of the first legs 11 may not be provided. That is, in the case where the first leg 11 is one side and the first inclined portion S1 is the inclined portion of the first leg 11, the diagonal brace 30 that connects the first legs 11 to each other may not be provided. This is because the jacket structure 100 can be vibrated at a desired frequency in response to vibrations input from the offshore wind turbine.

Also, a diagonal brace 30 that connects a second slope portion S2 corresponding to one of the first legs 11 and a second slope portion S2 corresponding to a different one of the first legs 11. may not be provided. That is, in the case where the first leg 11 is the other leg and the second inclined portion S2 is the inclined portion of the first leg 11, the diagonal brace 30 that connects the first legs 11 to each other may not be provided.

Next, regarding the length in the vertical direction of each component of the jacket structure 100, an example will be given in which one of the first leg 11 and the second leg 21 is the first leg 11 and the other is the second leg 21. I will list and explain.
The distance along the vertical direction from one end of the first inclined portion S1 to the other end of the first inclined portion S1 is shorter than the distance along the vertical direction from the upper end of the first vertical portion V1 to the lower end of the second vertical portion V2. . Further, the distance along the vertical direction from the top end of the first vertical portion V1 to the bottom end of the second vertical portion V2 is less than the distance along the vertical direction from the top end of the second slope portion S2 to the bottom end of the second slope portion S2. short.
That is, in the present embodiment, it is preferable that the vertical length of each of the above-described structures is configured such that the higher the position, the shorter the vertical length, and the lower the position, the longer the vertical length.
Moreover, the length in the vertical direction of each structure mentioned above may be arbitrarily determined according to the conditions of a construction site etc. without being limited to this.

As explained above, according to the jacket structure 100 according to the present embodiment, one of the three or more first legs and the three or more second legs is inserted into the inside thereof. be done. In other words, the second leg is inserted inside the first leg. Alternatively, the first leg is inserted inside the second leg. Thereby, the first jacket structure and the second jacket structure can be brought into a state where they can be joined. Therefore, for example, the structure described in the above-mentioned prior art, in which a plurality of legs having a jacket structure is attached to one long pile driven in the vertical direction in the axial direction of the long pile Compared to this, it is possible to eliminate the need for long stakes. Therefore, the transportability of the foundation pile can be improved. Furthermore, construction using a crane ship can be facilitated. This aspect can bring about particularly remarkable effects when constructing a large-sized jacket structure.
Furthermore, when forming the jacket structure, the first jacket structure and the second jacket structure are transported in a divided state and joined at the construction site, thereby improving the transportability and workability of the jacket structure. be able to.

Here, for example, the time required to join the first leg and the second leg by welding (for example, 2 to 3 days) is longer than the time required to join by grouting (for example, 1 day). Significantly longer. Furthermore, when joining by welding, it is necessary to perform an ultrasonic inspection 24 to 48 hours after the completion of construction. Furthermore, in the case of welding, high accuracy is required regarding dimensional errors between the first jacket structure and the second jacket structure.
Further, since welding under water is not common, when welding the joint between the first leg and the second leg, it is assumed that the joint is in the air. When performing underwater welding, quality control is difficult and unit costs are high.
On the other hand, the portion of each of the two into which the corresponding one is inserted, and the portion of each of the other into which the corresponding one of the two is inserted are joined with grout. That is, the first leg and the second leg are joined by grout (grout joint). Thereby, compared to the case where the first leg and the second leg are joined by welding, the time required for construction can be significantly reduced. Ultrasonic examination can be made unnecessary. Therefore, the time required for construction can be significantly reduced. Furthermore, when grouting is performed underwater, it is easier to ensure quality compared to underwater welding. Further, in the case of grouting, dimensional errors between the first jacket structure and the second jacket structure can be made more tolerant than in the case of welding.

Here, it is not common to weld the steel pipe pile and the leg underwater. Therefore, when welding the joint between the steel pipe pile and the leg, it is assumed that the joint is in the air. Furthermore, when performing underwater welding, quality control is difficult and unit costs are high. On the other hand, among each of the one and the other, the part to be inserted into the corresponding one of the three or more steel pipe piles driven into the seabed ground, and the part of each of the three or more steel pipe piles, The corresponding portions are connected with grout. That is, the second leg and the steel pipe pile are joined by grout. As a result, compared to joining by welding, the time required for construction can be significantly reduced.

Moreover, the outer diameter of each of the second legs, which is one of the two legs, is smaller than the inner diameter of each of the three or more steel pipe piles. That is, the outer diameter of the second leg is smaller than the inner diameter of the steel pipe pile. Thereby, the second jacket structure and the steel pipe pile can be easily joined by inserting the second leg inside the steel pipe pile.
Moreover, the inner diameter of one of the first leg and the second leg is larger than the outer diameter of the other leg. Thereby, by inserting one of the first leg and the second leg inside the other, the first leg and the second leg can be easily joined.

Here, when constructing the jacket structure, the first jacket structure and the second jacket structure are manufactured in advance at a factory and joined at the construction site. Steel pipe piles will be driven into the seabed at the construction site. For this reason, the accuracy of the spacing between the steel pipe piles is lower than the accuracy of the spacing between the first legs and the spacing between the second legs.

Therefore, the difference between the inner diameter of each of three or more steel pipe piles and the respective outer diameter of one or the other is the inner diameter of one of the first leg and the second leg and the outer diameter of the other leg. It's bigger than the difference between. In other words, when the steel pipe pile and the second leg are joined, and the second leg and the first leg are joined, the size of the gap that occurs between the inner surface of the steel pipe pile and the outer surface of the second leg is It is larger than the size of the gap created between the outer surface of the leg and the inner surface of the first leg (or the outer surface of the first leg and the inner surface of the second leg). Thereby, even if the accuracy of the spacing between the steel pipe piles is low, the second jacket structure and the steel pipe piles can be joined to each other.
In addition, by reducing the gap between the outer surface of the second leg and the inner surface of the first leg (or the outer surface of the first leg and the inner surface of the second leg), the amount of grout used for joining can be reduced to the minimum necessary. It can be done.

According to the invention, the invention further includes a diagonal brace that connects one of the first leg and the second leg to a different leg, and the diagonal brace extends along the horizontal direction. Look, the one inserted into a different one of the other overlaps. That is, the end of the diagonal brace overlaps the joint between the first leg and the second leg. Thereby, the rigidity of the jacket structure can be improved.

According to the invention, the invention further includes a diagonal brace that connects one of the first leg and the second leg to a different leg, and the diagonal brace extends along the horizontal direction. Look, what is inserted into a different one of the other, does not overlap. That is, the end of the diagonal brace does not overlap the joint between the first leg and the second leg. Thereby, it is possible to prevent a force (flattening force) that tends to flatten the first leg or the second leg by the diagonal brace from being applied to the joint portion. Therefore, the design of the joint can be studied without considering the influence of flattening force. Therefore, the design of the jacket structure can be facilitated.

According to this invention, the portion into which the corresponding one of the first leg and the second leg is inserted is the first vertical portion extending along the vertical direction. The portion inserted into the corresponding one of the first leg and the second leg is a second vertical portion extending along the vertical direction. Of each of the one and the other steel pipe piles, the portion inserted into the corresponding one of the three or more steel pipe piles is a third vertical portion extending along the vertical direction. A portion into which a corresponding one of the three or more steel pipe piles is inserted is a fourth vertical portion extending along the vertical direction.

That is, the joint between the first leg and the second leg and the joint between the second leg and the steel pipe pile both extend in the vertical direction. Thereby, the first jacket structure and the second jacket structure can be brought into a state where they can be joined by lowering the first jacket structure from above the second jacket structure. Further, the second jacket structure and the steel pipe pile can be brought into a state in which they can be joined by lowering the second jacket structure from above the steel pipe pile. Therefore, the first jacket structure and the second jacket structure can be joined together, and the second jacket structure and the steel pipe pile can be joined easily and reliably.

According to the invention, the invention further includes a first contact member provided on either the first vertical portion or the second vertical portion, and a second contact member provided on the third vertical portion, and the first contact member is provided on the third vertical portion. The member abuts one of the first vertical section and the second vertical section, and the second abutting member abuts the upper end of the fourth vertical section. This allows the weight of the first jacket structure and the second jacket structure to be temporarily supported during construction of the jacket structure. Moreover, the insertion allowance can be defined at the joint between the first leg and the second leg and the joint between the second leg and the steel pipe pile. Therefore, an accurate insertion distance can be easily and reliably secured.

According to this invention, the first inclined portion is inclined such that the lower end of the first inclined portion is farther from the tower than the upper end of the first inclined portion when viewed along the vertical direction. The second sloped portion is sloped such that the lower end of the second sloped portion is farther from the tower than the upper end of the second sloped portion when viewed along the vertical direction. Thereby, the first jacket structure and the second jacket structure can be formed to increase in size from the top to the bottom. Therefore, the jacket structure can be stabilized against the overturning moment transmitted from the offshore wind turbine, and the axial force generated in the foundation pile can also be reduced.

According to this invention, the vicinity of the upper end or the vicinity of the lower end of the first vertical portion corresponding to one of the first leg and the second leg, and one of the first leg and the second leg The apparatus further includes a first horizontal member that connects the vicinity of the upper end or the vicinity of the lower end of the first vertical part corresponding to one different one. Or, the vicinity of the upper end or the vicinity of the lower end of the second inclined portion corresponding to one of the other one of the first leg and the second leg is different from the other one of the first leg and the second leg. The device further includes a second horizontal member that connects the vicinity of the upper end or the vicinity of the lower end of the second inclined portion corresponding to the second inclined portion. Thereby, the rigidity of the location where the first horizontal member or the second horizontal member is provided can be improved.

According to this invention, one of the first leg and the second leg is three or more first legs, and the other is three or more second legs. In other words, one is composed of three or more first legs, and the other is composed of three or more second legs. That is, the second leg is inserted inside the first leg. The distance along the vertical direction from one end of the first sloped portion to the other end of the first sloped portion is shorter than the distance along the vertical direction from the top end of the first vertical portion to the bottom end of the second vertical portion. The distance along the vertical direction from the top end of the first vertical portion to the bottom end of the second vertical portion is shorter than the distance along the vertical direction from the top end of the second slope portion to the bottom end of the second slope portion. This allows the jacket structure to have a stable structure.

According to the present invention, the first inclined portion corresponds to one of the three or more first legs, and the first inclined portion corresponds to one different from one of the three or more first legs. No diagonal brace is provided to connect and. This allows the first jacket structure to vibrate at a desired frequency in response to vibrations input from the offshore wind turbine. Therefore, the first jacket structure can have a structure that easily absorbs vibrations from the offshore wind turbine.

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, even when the first leg 11 is the other leg and the inclined portion of the first leg 11 is the second inclined portion S2, the diagonal brace 30 connecting the first legs 11 may be provided.
Further, in the first leg 11 or the second leg 21, a portion to which the diagonal brace 30 or the horizontal member 40 is connected may be made thicker than other portions.
Furthermore, in the case where there are four first legs and four second legs, that is, there are four pairs of the first leg and the second leg, the relationship between one leg and the other in the adjacent pairs is different. Good too. For example, a set in which the first leg is on one side and a second leg on the other hand, and a set in which the first leg is on the other hand and the second leg is on the other side are arranged alternately in the circumferential direction of the jacket structure. It's okay.
Furthermore, although it has been explained that the second leg 21 and the steel pipe pile P are joined by inserting the end of the second leg 21 inside the steel pipe pile P, the present invention is not limited to this. The second leg 21 and the steel pipe pile P may be joined by inserting and fixing the end of the steel pipe pile inside the second leg 21.

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.

10 First jacket structure 11 First leg 11C First contact member 20 Second jacket structure 21 Second leg 21C Second contact member 30 Diagonal brace 40 Horizontal member 41 First horizontal member 42 Second horizontal member 100 Jacket Structure P Steel pipe pile S1 First inclined part S2 Second inclined part V1 First vertical part V2 Second vertical part V3 Third vertical part V4 Fourth vertical part W Offshore wind turbine

Claims (8)

a first jacket structure having three or more first legs;
a second jacket structure that supports the first jacket structure and has three or more second legs;
A jacket structure comprising:
One of the three or more first legs and the three or more second legs has a corresponding one inserted inside each of the one,
A jacket structure characterized by: A portion of each of the one parts into which the corresponding one of the other parts is inserted and a part of each of the other parts to be inserted into the corresponding part of the one part are joined with grout.
The jacket structure according to claim 1, characterized in that: Of each of the above-mentioned one and the above-mentioned other, the part to be inserted into the corresponding one of the three or more steel pipe piles driven into the seabed ground, and the part of the above-mentioned three or more steel pipe piles, respectively. The part where the corresponding one is inserted is joined with grout,
The jacket structure according to claim 1, characterized in that: Of each of the one, the portion into which the corresponding one of the other is inserted is a first vertical portion extending along the vertical direction,
Of each of the other parts, the part to be inserted into the corresponding one part is a second vertical part extending in the vertical direction.
The jacket structure according to claim 1, characterized in that: a first contact member provided on either the first vertical portion or the second vertical portion;
further comprising;
the first abutting member abuts on something other than either of the above;
The jacket structure according to claim 4, characterized in that: a diagonal brace that connects one of the one and one of the one that is different from the one;
further comprising;
the diagonal brace overlaps the other one inserted into the different one when viewed along the horizontal direction;
The jacket structure according to claim 1, characterized in that: a diagonal brace that connects one of the one and one of the one that is different from the one;
further comprising;
The diagonal brace does not overlap the other one inserted into the different one when viewed along the horizontal direction;
The jacket structure according to claim 1, characterized in that: Of each of the first inclined parts, the first inclined part is a part different from the part into which the corresponding one of the other parts is inserted, and when viewed along the vertical direction, the lower end of the first inclined part is opposite to the first inclined part. 1 slopes away from the top of the slope part from the stand provided on the jacket structure;
The jacket structure according to claim 1, characterized in that:

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