JP2023162925A - Floating structure and ocean wind power generation facility - Google Patents

Abstract

To provide a floating structure and an ocean wind power generation facility capable of suppressing heaving.SOLUTION: A floating structure 100 installed on ocean including an annular floating body 10 which is an annular shape having a through hole extending in the vertical direction and having the ranges divided into the environment and an inside range 12 surrounded by the annular floating body 10 by the annular floating body 10 has a communication unit 18 connected to the environment and the inside range 12 and functioning as a flow path for the water.SELECTED DRAWING: Figure 1

Description

The present invention relates to a floating structure used as a foundation for, for example, an offshore wind power generation facility and an offshore wind power generation facility.

Conventionally, offshore wind power generation facilities are mainly classified into two types: fixed type and floating type. The ground type is a method in which wind power equipment is installed on a foundation fixed to the seabed, and the floating type is a method in which wind power equipment is installed on a floating structure floating on the sea. As the depth of the water increases, fixed-type offshore wind power generation facilities have problems with structural feasibility, and the cost increases rapidly. For this reason, there is a need to put floating offshore wind power generation facilities into practical use. In particular, unlike Europe, there are many coasts in Japan where the water depth increases rapidly rather than being shallow, so floating systems have a wide range of applications. Floating structures used in floating structures are mainly classified into four types: barge type (also referred to as pontoon type), TLP type, semi-sub type, and spar type (see, for example, Non-Patent Document 1). Each type of floating body is moored offshore using anchors and mooring lines installed on the seabed. Structural materials for manufacturing floating structures include steel, reinforced concrete, and composite structures (hybrid structures) using both.

Floating offshore wind power generation facilities are currently being tested in Japan and Europe for each of the above-mentioned floating types (for example, see Non-Patent Document 2). Each floating type has its own characteristics, and its applicability varies depending on the size of the power plant, location, sea conditions, and manufacturing location.

For example, a barge type has a ark-like structure with a flat bottom, which increases stability by increasing the contact surface with the water surface. This barge type has a large water line area and a large restoring force against inclination of the floating body, so it has the advantage of being able to reduce the size of the floating body. However, there are problems in that the projected area near the sea surface, where the wave force is large, is large, so the acting wave force is large, and the waves and the floating body have similar periods of movement, resulting in violent shaking.

As an example of a barge-type oscillation reduction measure, a ring-shaped floating body with a through hole provided in the center when viewed from vertically above is known (see, for example, Non-Patent Document 3). This configuration uses the vibrations of the water trapped in the annular floating body to stabilize it. However, in this structure, in a specific frequency band, the water mass in the moon pool has the opposite phase of the effect of suppressing the vertical motion (heave) of the floating body, and on the contrary, a phenomenon is observed that increases the vertical motion. Similarly, it has been pointed out that in certain frequency bands, the sloshing of the water mass in the moonpool increases the oscillation of the rotating system (pitch in headward waves, roll in transverse waves) (for example, (See Non-Patent Document 4).

Ministry of Land, Infrastructure, Transport and Tourism Ports and Harbors Bureau homepage, “Study group on the ideal form of base ports to achieve carbon neutrality in 2050 (1st meeting), May 18, 2021, Document 3, p.37”, [online], [Reiwa 4 Searched on March 15], Internet <URL: https://www.mlit.go.jp/common/001404624.pdf> New Energy and Industrial Technology Development Organization website, “Floating offshore wind power generation technology guidebook appendix, New Energy and Industrial Technology Development Organization, 2018.3, p.129”, [online] , [Retrieved March 15, 2020], Internet <URL: https://www.nedo.go.jp/content/100891425.pdf> “Study on the motion characteristics of various floating body types”, Yuka Kikuchi et al., Wind Energy Utilization Symposium, Vol. 39, pp. 315-318, 2017 “Study on the influence of moonpools on the motion characteristics of pontoon-type floating bodies”, Souya Morizu et al., Nihon University College of Science and Engineering Academic Conference Proceedings 2019, pp.669-670, 2019

As described above, in the conventional floating structure described in Non-Patent Document 3, there is a possibility that the vertical vibration becomes large in a specific frequency band. For this reason, there has been a need for a structure that can suppress vertical shaking.

The present invention has been made in view of the above, and an object of the present invention is to provide a floating structure and an offshore wind power generation facility that can suppress vertical shaking.

In order to solve the above problems and achieve the objects, a floating structure according to the present invention includes an annular annular floating body having a through hole extending in the vertical direction, and the annular floating body connects the external world to the annular floating body. A floating structure installed on the ocean that is divided into an enclosed internal area and has a communication part that connects the external world and the internal area and functions as a water flow path. Features.

Further, in another floating structure according to the present invention, in the above-described invention, the annular floating body has a plurality of island-shaped parts that project vertically upward from the waterline, and a structure that connects underwater between the island-shaped parts. and a connecting portion that connects, and the communicating portion is located vertically above the connecting portion.

Further, in another floating structure according to the present invention, in the above-mentioned invention, the annular floating body further includes a bridge portion that connects the island portions on the water located vertically above the connecting portion. It is characterized by

Further, in another floating structure according to the present invention, in the above-described invention, the annular floating body is connected to the connecting portion and the bridge portion, extending along a vertical direction and a penetrating direction of the communicating portion. It is characterized by further comprising a partition wall.

Further, another floating structure according to the present invention includes an annular annular floating body having a through hole extending in the vertical direction, and the annular floating body defines an area between the outside world and an internal area surrounded by the annular floating body. The annular floating structure is a floating structure that is installed on the ocean, and the annular floating structure has a shape that has a single cross section in at least one horizontal cross section in the water, and at least in the water. A cross-sectional view of any one of the horizontally extending cross sections is characterized by a shape in which a plurality of cross sections are scattered.

Further, an offshore wind power generation facility according to the present invention is characterized by comprising the above-described floating structure and wind power generation equipment provided on the floating structure.

According to the floating structure according to the present invention, the floating structure includes an annular floating body having a through hole extending in the vertical direction, and the annular floating body divides the area into the outside world and an internal area surrounded by the annular floating body. , a floating structure installed on the ocean, which is connected to the outside world and the internal area and has a communication part that functions as a water flow path, so that it absorbs some of the waves and water currents that act on the annular floating structure. By letting it escape from the communication part, it becomes possible to reduce the wave force that the annular floating body receives. Therefore, it is possible to reduce vertical shaking of the floating structure.

Further, according to another floating structure according to the present invention, in the above-described invention, the annular floating body has a plurality of island-like parts that project vertically upward from the waterline, and a plurality of island-like parts that are underwater. and a connecting part that connects the annular floating body, and the communicating part is located vertically above the connecting part, so that part of the waves and water current acting on the annular floating body is released from the communicating part, so that the annular floating body receives It becomes possible to reduce wave power. Therefore, it is possible to reduce vertical shaking of the floating structure.

Further, according to another floating structure according to the present invention, in the above-mentioned invention, the annular floating body further includes a bridge portion connecting between the island portions on the water located vertically above the connecting portion. Therefore, it is possible to easily go back and forth between the island-shaped parts.

According to another floating structure according to the present invention, in the above-described invention, the annular floating body includes the connecting portion and the bridge portion extending along the vertical direction and the penetrating direction of the communicating portion. Since the floating structure further includes a partition wall connected to the connecting portion, it is possible to ensure rigidity at the connecting portion and to reduce vertical shaking of the floating structure.

Further, according to another floating structure according to the present invention, the annular floating body has a through hole extending in the vertical direction, and the annular floating body provides a connection between the outside world and an internal region surrounded by the annular floating body. A floating structure installed on the ocean that is divided into areas, the annular floating structure having a shape that is a single cross-section in at least a cross-sectional view of any horizontally extending cross-section in the water, At least in the cross-sectional view of any horizontally extending section on the water, the shape is dotted with a plurality of cross sections, so by letting some of the waves and water flow acting on the annular floating body escape from the communication part, the annular floating body It becomes possible to reduce the wave force that the floating body receives. Therefore, it is possible to reduce vertical shaking of the floating structure.

Further, according to the offshore wind power generation facility according to the present invention, since the above-mentioned floating structure and the wind power generation equipment provided on the floating structure are provided, a floating offshore wind power generation facility with reduced vertical shaking is provided. This has the effect of being able to provide power generation facilities.

FIG. 1 is a schematic perspective view showing Embodiment 1 of a floating structure according to the present invention, in which (1) is a view seen diagonally from above, and (2) is a view seen horizontally from the waterline. FIG. 2 is a schematic perspective view showing Embodiment 2 of the floating structure according to the present invention. FIG. 3 is a schematic perspective view showing a modification example 1 of the floating structure according to the present invention. FIG. 4 is a schematic perspective view showing a second modification of the floating structure according to the present invention. FIG. 5 is a plan view showing an example of installation work of a wind turbine on a quay.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a floating structure and an offshore wind power generation facility according to the present invention will be described in detail below based on the drawings. Note that the present invention is not limited to this embodiment.

(Embodiment 1)
First, Embodiment 1 of the present invention will be described.
As shown in FIG. 1, the floating structure 100 according to the first embodiment is of a barge type with a shallow draft and a flat bottom, and has a through hole in the center when viewed from vertically above. It consists of an annular floating body 10. The annular floating body 10 has a square (rectangular) outer shape when viewed from vertically above, and the outer and inner contours of the annular floating body 10 are concentric square shapes. That is, the annular floating body 10 divides the area into the outside world and an internal area 12 surrounded by the annular floating body 10. Note that the "draft" in this specification is the distance from the lowest end of the floating structure 100 floating on water to the water surface in the vertical direction, and the "waterline" refers to the distance between the floating structure 100 floating on water and The line of intersection with the water surface.

Further, the offshore wind power generation facility 1 according to the first embodiment of the present invention includes a wind power generation facility 2 provided on the corner portion 10A of the annular floating body 10. The wind power generation facility 2 includes a wind turbine tower 3, a wind turbine (not shown) provided at the top of the wind turbine tower 3, and a generator. Although the illustrated example shows a case where the wind turbine tower 3 is disposed at one corner 10A (later-described island section 14) of the annular floating body 10, the present invention is not limited to this.

The annular floating body 10 has four island-like parts 14 that protrude vertically upward from the waterline WL (water surface), and a connecting part 16 that connects the four island-like parts 14 underwater. The annular floating body 10 has a square outer shape when viewed from vertically above, and the outer and inner contours of the annular floating body 10 are concentric squares. That is, the annular floating body 10 has a substantially L-shaped island portion 14 at the corner portions 10A corresponding to the four corners of the annular floating body 10 when viewed from vertically above, and an approximately I-shaped island portion 14 connecting the two corner portions 10A. It has a connecting portion 16 in the shape of a letter. Therefore, a communication portion 18 is formed between the two island-like portions 14, that is, above the connecting portion 16. For this reason, the annular floating body 10 has a shape that has an annular cross section in at least a cross section extending in any horizontal direction underwater, and at least extends in any horizontal direction above the water. The cross-sectional view shows a shape in which a plurality of cross sections are scattered.

The material constituting the annular floating body 10 (the island portion 14, the connecting portion 16) may be, for example, steel, reinforced concrete, fiber concrete, or a synthetic structure using these materials.

The communication portion 18 is connected to the outside of the annular floating body 10 and the internal region 12 surrounded by the annular floating body 10, and functions as a flow path that allows water to pass therethrough. In other words, the annular floating body 10 is cut out leaving the island part 14 and the connecting part 16 that connects the two island parts 14 at the corner parts 10A corresponding to the four corners, and the groove-like communication part 18 is formed in the annular floating body. It is said to have a shape.

The total width of the communication portion 18 per side of the annular floating body 10 shall be at least 10% or more and less than 80% of the width of the annular floating body 10 on that side (the length of one side of the square outer contour). It is desirable to do so. If the width of the communication portion 18 is less than 10% of the width of the annular floating body 10, there is a possibility that the wave force reduction effect of the communication portion 18 may not be sufficiently obtained. In addition, when the width of the communication portion 18 is 80% or more, the annular floating body 10 itself becomes large and semi-submarine in order to secure the second moment of inertia on the water line to ensure the righting performance of the floating structure 100. There is a risk that the advantage of the barge type, which allows the floating body to be smaller in size compared to the barge type, may not be fully realized.

The surface 18A of the connecting portion 16 facing the communication portion 18 may be a surface that is inclined so as to protrude vertically upward as it goes from the outside to the inside of the annular floating body 10, and for example, at an angle of 30° to 60° with respect to the horizontal plane. An inclination gradient may be provided within a range of approximately 100°. Further, the side wall 18B of the island-shaped portion 14 facing the communication portion 18 is not limited to a vertical wall extending in the vertical direction as shown in FIG. 1, but may be an inclined wall inclined with respect to the vertical direction. Further, the width of the communication portion 18 in the horizontal direction may be set to gradually increase or decrease as it goes from the outside of the annular floating body 10 toward the inside. By setting the cross-sectional shape of the communication portion 18 to a rapidly expanding, gradually expanding, rapidly contracting, or gradually contracting shape, the flow velocity of waves passing through the communicating portion 18 is changed, and the sloshing period and phase difference can be adjusted. It can be adjusted to have the effect of reducing the vibration caused by sloshing. It is preferable that the shape and inclination angle of the communication portion 18 be optimized with respect to the sea conditions of the sea area where the floating structure 100 is installed.

Since the floating structure 100 of this embodiment is a barge type, it has the advantage of being able to have a shallow draft. However, if the draft is made too shallow, the bottom of the annular floating body 10 will absorb impact loads from waves due to slamming. There is a risk of receiving For this reason, it is desirable that the distance from the bottom surface of the annular floating body 10 to the resting draft when in service is at least 1/2 or more of the design significant wave height under normal sea conditions (one-year reproduction expected value) in the installation sea area. On the other hand, excessively increasing the resting draft from the bottom surface of the annular floating structure 10 during service will make construction easier, so the distance is an extreme value set for the service life of the floating structure 100. It is desirable to set it to 2.5 times or less of the design significant wave height under sea conditions.

The operation and effect of the above configuration will be explained. The annular floating body 10 according to the present embodiment is provided with the communication portion 18, so that the external force that the annular floating body 10 receives from waves can be reduced. Further, a part of the water flow accompanying the vertical movement of water in the internal region 12 surrounded by the annular floating body 10 is released to the outside of the annular floating body 10 through the communication portion 18 . Therefore, although the annular floating body 10 according to the present embodiment has an annular barge-type floating structure, it is possible to reduce the heave of the floating structure in a specific frequency band caused by synchronization with waves. . Furthermore, vertical shaking can be suppressed by reducing the water line area. In other words, the floating structure 100 has a shape that can exhibit the effect of reducing the oscillation of the floating structure 100.

As described above, according to the present embodiment, although it is a barge type, the stability is reduced by reducing the water line area that governs the stability of vertical vibration, and the natural period of vertical vibration is shifted to the long period side. By setting this, the effect of reducing the sway of the floating body can be achieved. This effect is particularly noticeable when the floating structure has a low vibration period.

Further, according to the present embodiment, since it is a barge-type floating structure, the draft at the time of installation is small, and it can be applied to relatively shallow sea areas (eg, about 40 m to 80 m deep). In addition, since the draft at launch is small, the water depth required for wind turbine assembly and temporary storage is small, and there is a high degree of freedom in selecting the water area to be used.

By setting the static draft of the floating structure 100 during service within an appropriate range, it is possible to reduce the impact load due to slamming of the floating structure 100 during waves, and to improve the ease of construction of the floating structure 100. The shape is also conducive.

In the above embodiment, the floating structure 100 has a square outer shape when viewed from vertically above. However, the present invention is not limited to this. Any external shape may be used as long as it has an internal area surrounded by a water passageway and a communication portion 18 that functions as a flow path that allows water to pass therethrough. Therefore, for example, the external shape viewed from vertically above may be a polygonal shape such as a triangle or a rectangle, or a circular shape.

In the above embodiment, the annular floating body 10 is used as the base of the wind power generation equipment 2 such as a large wind turbine (for example, the base of the tower 3), and the base of the wind power generation equipment 2 is connected to the corner portion 10A, more specifically, as the base of the wind power generation equipment 2 such as a large wind turbine. It was provided in the island-like part 14.

Further, as shown in FIG. 5, when the work to mount the wind turbine tower 3 on one of the corners 10A of the annular floating body 10 is carried out on the quay G, the two annular floating bodies 10 are mounted on the wind turbine tower 3. It is preferable that the island portions 14 to be mounted are arranged adjacent to each other. By doing so, the tower 3 and the windmill can be respectively mounted on the two annular floating bodies 10 using one crane C on the quay G. In this way, by arranging the annular floating body 10 at an appropriate position, it is possible to easily carry out construction work for mounting the tower 3 and wind turbines from the quay G, and it is possible to improve construction efficiency and reduce construction costs. can.

In the above embodiment, the floating structure 100 in which the annular floating body 10 is applied to the foundation of the floating offshore wind power generation facility 1 was explained as an example, but the floating structure of the present invention is applicable to the floating offshore wind power generation facility 1. It is not limited to foundations for facilities. Any equipment may be mounted on the floating structure of the present invention as long as it meets the purpose.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
As shown in FIG. 2, compared to the first embodiment, the floating structure 200 according to the second embodiment has a bridge section that connects the island-like sections 14 on the water located vertically above the connecting section 16. It differs in that it has 20. That is, in the floating structure 100 according to Embodiment 1, the island portions 14 are cut out at the corner portions 10A corresponding to the four corners, and the groove-like communication portions 18 are formed in the annular floating body. On the other hand, in the shaped floating body structure 200 according to the present embodiment, through holes connecting to the outside of the annular floating body 10 and the internal region 12 surrounded by the annular floating body 10 are provided in parts other than the corner portions 10A corresponding to the four corners. The difference is that a certain communication portion 18 is provided in an annular floating body.

Therefore, the communication portion 18 of the through hole is connected to the outside of the annular floating body 10 and the internal region 12 surrounded by the annular floating body 10, similar to the groove-like communication portion 18 of the first embodiment, and prevents water from passing through. Functions as a permissive flow path. In this manner, the annular floating body 10 is provided with the communication portion 18, thereby making it possible to reduce the external force that the annular floating body 10 receives from waves. Further, a part of the water flow accompanying the vertical movement of water in the internal region 12 surrounded by the annular floating body 10 is released to the outside of the annular floating body 10 through the communication portion 18 . Therefore, although the annular floating body 10 according to the present embodiment has an annular barge-type floating structure, it is possible to reduce the heave of the floating structure in a specific frequency band caused by synchronization with waves. . Furthermore, vertical shaking can be suppressed by reducing the water line area. In other words, the floating structure 200 has a shape that can exhibit the effect of reducing the oscillation of the floating structure 200. In this way, the second embodiment differs from the configuration of the first embodiment only in that a bridge section 20 is further provided, so the influence of water flow and waves is no different from the first embodiment. It is possible to obtain the same agitation reduction effect as in Form 1.

In addition, in the floating structure 200, the bridge section 20 and the island section 14 are configured without any difference in level, and it is possible to easily go back and forth between the island section 14 by crossing over the bridge section 20 during maintenance work or the like. I can do it. Further, by providing an appropriate bridge section vertically above the connection section 16 and, by extension, the communication section 18, it is possible to reduce the bending moment applied to the connection section 16 under the bridge section 20. Thereby, sufficient strength can be maintained in the vicinity of the connecting portion 16.

Note that, like the island portion 14 and the connecting portion 16, the bridge portion 20 may be made of, for example, steel, reinforced concrete, fiber concrete, or a composite structure using these materials. In order to prevent damage due to a phenomenon called slamming where the bridge section 20 receives an impact load due to waves under the action of waves, the lower surface of the bridge section 20 is designed to have at least the same draft as the resting draft when in service compared to the resting draft when the floating structure 200 is in service. It is desirable to provide a clearance of 1/4 or more of the design wave height under normal sea conditions. By setting the height of the bridge section 20 at a distance from the water surface when the floating structure 200 is in service and at rest, it is possible to reduce wave impact pressure and prevent damage. Further, the bridge section 20 may have a shape that partially extends to the upper part of the depth (upper deck) of the annular floating body 10 in order to sufficiently bear the load applied to the connecting section 16 below.

In the second embodiment, the tower 3 may be placed at either corner 10A of the annular floating body 10 as in the first embodiment, or may be placed near the center of the bridge portion 20 on one side of the annular floating body 10. It may be installed. If installed near the center of the bridge section 20, it is possible to easily satisfy the righting performance required by the design rules and to suppress excessive torsional moments. By installing it at either corner 10A of the annular floating body 10, it is possible to limit the increase in area of the bridge section 20 due to reinforcement of the lower part of the tower 3.

(Modification 1)
Next, a first modification of the second embodiment of the present invention will be described.
As shown in FIG. 3, a floating structure 300 according to the first modification has a partition wall 22 provided in the communication portion 18 of the second embodiment. The partition wall 22 is a wall connected to the bridge section 20 and the connecting section 16, extending along the vertical direction and the direction from the outside to the inside of the annular floating body 10, that is, the direction in which the communication section 18 penetrates. Therefore, the partition wall 22 is configured to face the side wall 18B of the island portion 14. Since the partition wall 22 becomes a member that supports the bridge section 20, it is advantageous to ensure the structural strength of the bridge section 20. Although the example in FIG. 3 shows the case where two partition walls 22 are arranged at equal intervals in the width direction of the communication section 18, the present invention is not limited to this, and the number of partition walls 22 provided in the communication section 18 is one. It may be one sheet or three or more sheets.

(Modification 2)
Next, a second modification of the second embodiment of the present invention will be described.
In modification example 1, the communication portion 18, which is a through hole that connects the outside of the annular floating body 10 and the internal region 12 surrounded by the annular floating body 10, is made into an annular floating body that has one through hole that passes through the annular floating body 10 in the vertical direction. The communication portion 18 was formed into a plurality of through holes by the partition walls 22. However, the present invention is not limited to this, and the annular floating body 10 may not only have an annular shape when viewed from vertically above, but also have a lattice shape having a plurality of through holes passing through the annular floating body 10 in the vertical direction, as in Modification 2 shown in FIG. The floating body structure 400 may be made using floating bodies. In other words, Modification 2 has a configuration in which a cross-shaped partition wall 24 is arranged in the internal area 12 surrounded by the annular floating body 10 of Modification 3, dividing the internal area 12 into four parts when viewed from vertically above. There is.

Looking at it from a different perspective, in addition to the island portions 14 located at the corner portions 10A located at the four corners, Modified Example 2 protrudes vertically upward from the cross-shaped waterline WL (water surface). It has a partition wall 24 which can also be called an island-shaped part 14. The annular floating body 10 has a substantially I-shaped connecting portion 16 that connects the corner portion 10A and the partition wall 24. Therefore, the annular floating body 10 is configured to have four corner portions 10A and eight connecting portions 16.

As explained above, the floating structure according to the present invention includes an annular annular floating body having a through hole extending in the vertical direction, and the annular floating body allows communication between the outside world and an internal region surrounded by the annular floating body. , a floating structure installed on the ocean that is divided into areas, and has a communication part that connects the external world and the internal area and functions as a water flow path, so that waves acting on the annular floating structure are By letting a part of the water flow escape from the communication part, it becomes possible to reduce the wave force that the annular floating body receives. Therefore, it is possible to reduce vertical shaking of the floating structure.

Further, according to another floating structure according to the present invention, in the above-described invention, the annular floating body has a plurality of island-like parts that project vertically upward from the waterline, and a plurality of island-like parts that are underwater. and a connecting part that connects the annular floating body, and the communicating part is located vertically above the connecting part, so that part of the waves and water current acting on the annular floating body is released from the communicating part, so that the annular floating body receives It becomes possible to reduce wave power. Therefore, vertical shaking of the floating structure can be reduced.

Further, according to another floating structure according to the present invention, in the above-mentioned invention, the annular floating body further includes a bridge portion connecting between the island portions on the water located vertically above the connecting portion. This allows for easy movement between the islands.

According to another floating structure according to the present invention, in the above-described invention, the annular floating body includes the connecting portion and the bridge portion extending along the vertical direction and the penetrating direction of the communicating portion. Since the floating structure further includes a partition wall connected to the connecting portion, it is possible to ensure rigidity at the connecting portion and to reduce vertical shaking of the floating structure.

Further, according to another floating structure according to the present invention, the annular floating body has a through hole extending in the vertical direction, and the annular floating body provides a connection between the outside world and an internal region surrounded by the annular floating body. A floating structure installed on the ocean that is divided into areas, the annular floating structure having a shape that is a single cross-section in at least a cross-sectional view of any horizontally extending cross-section in the water, At least the cross-sectional view of any horizontally extending section on the water has a shape in which a plurality of cross sections are scattered. It becomes possible to reduce the wave force that the floating body receives. Therefore, vertical shaking of the floating structure can be reduced.

Further, according to the offshore wind power generation facility according to the present invention, since the above-mentioned floating structure and the wind power generation equipment provided on the floating structure are provided, a floating offshore wind power generation facility with reduced vertical shaking is provided. Power generation facilities can be provided.

Further, since the offshore wind power generation facility according to the present invention includes the above-mentioned floating structure and wind power generation equipment provided on the floating structure, it is possible to create a floating offshore wind power generation facility with reduced vertical shaking. can be provided.

As described above, the floating structure and offshore wind power generation facility according to the present invention are useful for the foundation of a floating offshore wind power generation facility, and are particularly suitable for suppressing vertical shaking.

1 Offshore wind power generation facility 2 Wind power generation equipment 3 Wind turbine tower 10 Annular floating body 10A Corner part 12 Internal area 14 Island part 16 Connecting part 18 Communication part 18A Floor 18B Side wall 20 Bridge part 22 Partition wall 24 Partition wall 100-400 Floating body structure Object C Crane G Quay WL Waterline

Claims (6)

A floating structure installed on the ocean, comprising an annular floating body having a through hole extending in the vertical direction, the area being divided by the annular floating body into an outside world and an internal area surrounded by the annular floating body. hand,
A floating structure characterized by having a communication portion that connects to the outside world and the internal region and functions as a water flow path. The annular floating body includes a plurality of island-like parts that protrude vertically upward from the waterline, and a connecting part that connects the island-like parts underwater,
The floating structure according to claim 1, wherein the communication section is located vertically above the connection section. 3. The floating structure according to claim 2, wherein the annular floating body further includes a bridge section that connects the island sections on the water located vertically above the connection section. 4. The floating structure according to claim 3, wherein the annular floating body further includes a partition wall extending along a vertical direction and a penetrating direction of the communication section and connecting to the connecting section and the bridge section. . A floating structure installed on the ocean, comprising an annular floating body having a through hole extending in the vertical direction, the area being divided by the annular floating body into an outside world and an internal area surrounded by the annular floating body. hand,
The annular floating body has a shape that has one cross section at least when viewed in cross section in any horizontal direction underwater, and a plurality of cross sections when viewed at least in any horizontal cross section above water. A floating structure characterized by having a shape in which cross sections are scattered. A floating structure according to any one of claims 1 to 5,
A wind power generation facility provided on the floating structure;
An offshore wind power generation facility characterized by being equipped with.

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