Floating structures

Abstract

To provide a floating structure capable of suppressing increase in size while reducing oscillation.SOLUTION: A floating structure 1 in which a superstructure 9 is fixed at a top comprises a plurality of oscillation reduction parts 20 each having a first opening 21 formed on any one surface of an upper surface, a side surface, and a bottom surface, a second opening 22 formed on the other surface of the upper surface, the side surface, and the bottom surface, and a communication passage 23 to communicate the first opening 21 and the second opening 22. The second opening 22 is formed on a bottom surface 12 in a first oscillation reduction part among the oscillation parts 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a floating structure. [Background technology]

[0002] Floating structures to which superstructures such as wind turbines and substations are fixed have been known for some time. Floating structures are moored by anchors installed on the seabed and lines such as chains, wires, and ropes.

[0003] Barge-type floating structures installed on the sea surface have the advantage of being able to reduce the size of the floating structure because they have a large water surface area and a large restoring force against tilting.However, there was a problem in that the projected area near the sea surface, where wave force is strong, is large, and the wave force acting on the floating structure is large, and the oscillation period of the wave and the floating structure is close, resulting in severe oscillation.

[0004] The following Patent Document 1 proposes a barge-type floating structure in which a moonpool is formed in the center of the float, and the vibrations of the water trapped within the moonpool are used to minimize heave motion near the natural heave frequency. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2014-503424 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the floating structure described in Patent Document 1 requires a moonpool in the center to contain the vibrating water mass. However, because the moonpool is a uniform size in one location, there is a problem in that the wave characteristics that it can handle are limited.

[0007] Therefore, the present invention has been made in consideration of the above circumstances, and provides a floating structure that can reduce the size while reducing the motion. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following means. That is, the floating structure according to the present invention is a floating structure having a superstructure fixed to an upper portion thereof, and is provided with a motion reducer having a first opening formed on one of the top surface, the side surface, and the bottom surface, a second opening formed on the other of the top surface, the side surface, and the bottom surface, and a communication passage that communicates the first opening with the second opening. multiple Preparation In a first motion reduction section among the plurality of motion reduction sections, the second opening is formed on the bottom surface, and the communication passage has a first communication section extending laterally from the first opening, a second communication section extending laterally from the second opening, and a vertical communication section connecting the first communication section and the second communication section and extending in the vertical direction, and a plurality of the first motion reduction sections are provided, and among the plurality of first motion reduction sections, a height of the second communication section of one of the first motion reduction sections is different from a height of the second communication section of another of the first motion reduction sections. .

[0009] In a floating structure configured in this manner, a first opening is formed on one of the top, side, and bottom surfaces, and a second opening is formed on the other of the top, side, and bottom surfaces. This allows the direction of wave force to be dispersed among two of the top, side, and bottom surfaces, creating a phase difference in the wave force between the seawater in the communication passage and the seawater outside the floating structure, thereby reducing motion. Also, unlike conventional methods, there is no need to form a pool in the floating structure to store water masses, which allows the size of the floating structure to be reduced. In addition, since multiple motion reduction sections are provided and there is a high degree of freedom in the dimensions, the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions. In addition, in the communication passage of the first motion reduction section, the first communication section extends laterally from the first opening, and the second communication section extends laterally from the second opening, forming a bent shape. This reliably generates a phase difference in wave force between the seawater in the upper and lower communication sections and the seawater outside the floating structure, thereby reducing motion.

[0014] In addition, in the floating structure according to the present invention, in a second motion reduction section among the plurality of motion reduction sections, the second opening may be formed on the bottom surface directly below the first opening, and the communication passage may have a straight communication section that connects the first opening and the second opening and extends in the vertical direction.

[0015] In the floating structure configured in this manner, in the second motion reducer, the linear connecting portion has a linear shape extending in the vertical direction. By providing both the first motion reducer and the second motion reducer, the lengths of the first motion reducer and the second motion reducer can be changed, and a phase difference can be generated between the first motion reducer and the second motion reducer, thereby reducing motion.

[0016] In addition, in the floating structure of the present invention, in a third motion reduction section among the multiple motion reduction sections, the second opening may be formed on the side surface, and a water storage chamber located at a lower position than the second opening may be formed in the communicating passage.

[0017] In a floating structure configured in this manner, the third motion reduction section retains seawater in the water retention chamber, thereby reliably creating a phase difference in wave force between the seawater in the water retention chamber and the seawater outside the floating structure, thereby reducing motion.

[0018] Furthermore, in the floating structure according to the present invention, the third motion reduction section may have a bottom hole formed in the bottom surface, and the water retention chamber may be connected to the bottom hole.

[0019] In a floating structure configured in this manner, the water retention chamber is connected to the outside of the floating structure through a bottom hole formed in the bottom surface, thereby reducing the load acting on the floating structure caused by seawater stagnating in the water retention chamber.

[0020] Furthermore, the floating structure according to the present invention may include a plurality of the third motion reduction sections, and the water retention chambers of the plurality of third motion reduction sections may be connected to each other by a communication pipe.

[0021] In a floating structure configured in this manner, the water retention chambers of multiple third motion reduction sections are connected to each other by connecting pipes, so that the amount of seawater in the water retention chambers can be adjusted using multiple third motion reduction sections.

[0022] In the floating structure according to the present invention, the side surface may be inclined with respect to a vertical plane so as to be inclined upward toward the center of the top surface.

[0023] In a floating structure configured in this way, the inclined sides reduce horizontal wave forces and generate a vertical downward component, reducing motion. Furthermore, when waves collide with the sides, the direction of action of the wave forces can be dispersed more than when the sides are aligned vertically. [Effects of the Invention]

[0024] According to the floating structure of the present invention, it is possible to reduce the size while reducing the motion. [Brief explanation of the drawings]

[0025] [Figure 1] 1A and 1B are diagrams showing a schematic view of a floating structure according to a first embodiment of the present invention, in which (a) is a perspective view and (b) is a cross-sectional view taken along line II in FIG. 1A. [Figure 2] FIG. 1 is a perspective view schematically showing a floating structure according to a second embodiment and a third embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 10 is a perspective view schematically showing a floating structure according to a fourth embodiment and a fifth embodiment of the present invention. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. [Figure 8] FIG. 10 is a perspective view schematically showing a floating body structure according to a sixth embodiment, a seventh embodiment, and an eighth embodiment of the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. [Figure 10] 9 is a cross-sectional view taken along line XX in FIG. 8. [Figure 11] FIG. 10 is a cross-sectional view taken along line XI-XI in FIG. 8. [Figure 12] FIG. 13 is a perspective view schematically showing a floating structure according to a ninth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] (First embodiment) Hereinafter, a floating structure according to a first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a diagram schematically showing a floating body structure according to a first embodiment of the present invention, in which (a) is a perspective view and (b) is a cross-sectional view taken along line II in Fig. 1(a). Fig. 2 is a perspective view schematically showing floating body structures according to second and third embodiments of the present invention. As shown in Fig. 1, a floating structure 1 of this embodiment has a superstructure 9 constructed on top and fixed thereto. The floating structure 1 is a barge-type floating structure, and is moored by anchors installed on the seabed and lines such as chains, wires, and ropes. The superstructure 9 is, for example, a wind turbine generator or a substation facility. At least a portion of the floating structure 1 of this embodiment is located above the seawater surface W.

[0027] The floating structure 1 is a quadrangular prism. The shape of the floating structure 1 can be set as appropriate, and may be a triangular prism, a polygonal prism, a circular cylinder, etc. The structure of the floating structure 1 may be made of, for example, steel, reinforced concrete, or a composite structure using both steel and reinforced concrete.

[0028] In the following description, the direction from the center of the floating structure 1 toward the outer edge of the floating structure 1 in a plan view is referred to as the lateral direction.

[0029] The outer surface of the floating structure 1 has an upper surface 11, a bottom surface 12, and four side surfaces 13. The floating structure 1 is provided with four first motion reducers (motion reducers) 20.

[0030] As shown in FIG. 2, the first vibration reduction section 20 has a first opening 21, a second opening 22, and a communication passage 23.

[0031] The first openings 21 are formed so as to be recessed downward from the upper surface 11 of the floating structure 1. In a plan view, the first openings 21 have a substantially rectangular shape. The long sides of the first openings 21 are arranged parallel to the sides of the floating structure 1. In a plan view, the long sides of the four first openings 21 are respectively arranged along the four sides of the floating structure 1.

[0032] The second opening 22 is formed so as to be recessed upward from the bottom surface 12 of the floating structure 1. The second opening 22 is located vertically below the first opening 21. In a plan view, the second opening 22 has a generally rectangular shape that is slightly larger than the first opening 21.

[0033] The communication passage 23 communicates between the first opening 21 and the second opening 22. The communication passage 23 has a curved shape. The communication passage 23 has a first communication portion 24, a second communication portion 25, and an upper and lower communication portion 26.

[0034] The first communication portion 24 extends laterally from the first opening 21. The second communication portion 25 extends laterally from the second opening 22. The vertical communication portion 26 connects the first communication portion 24 and the second communication portion 25. The vertical communication portion 26 extends in the vertical direction. When the floating structure 1 is installed on the seawater surface W, seawater enters the communication passage 23 from the second opening 22, and the seawater surface W is located midway between the vertical communication portion 26.

[0035] The superstructure 9 is a structure such as a wind turbine generator or a substation facility. In FIG. 1, the superstructure 9 represents the lower part of the tower of a wind turbine generator. In a plan view, the superstructure 9 is disposed in approximately the center of the floating structure 1. The superstructure 9 is disposed inside the area surrounded by the four first openings 21.

[0036] In the floating structure 1 configured in this manner, a first opening 21 is formed on the top surface 11, and a second opening 22 is formed on the bottom surface 12. This distributes the direction of action of wave force between the top surface 11 and the bottom surface 12, causing a phase difference in wave force between the seawater in the communication passage 23 and the seawater outside the floating structure 1, thereby reducing rocking.

[0037] Furthermore, instead of a single pool for storing water masses in a floating structure as in the past, multiple first motion reduction sections 20 are provided, and the dimensions have a high degree of freedom, so the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0038] Furthermore, in the communication passage 23 of the first motion reduction section 20, the first communication section 24 extends laterally from the first opening 21, and the second communication section 25 extends laterally from the second opening 22, forming a bent shape. This reliably generates a phase difference in wave force between the seawater in the upper and lower communication sections 26 and the seawater outside the floating structure 1, thereby reducing motion.

[0039] Furthermore, the barge-type floating structure 1 has a small draft when installed, and therefore can be applied to sea areas with a relatively shallow depth (40 m to 80 m).

[0040] Furthermore, the barge-type floating structure 1 has a small draft when launched, so the required water depth for assembling the wind turbine or for temporary storage is small, allowing for greater freedom in selecting the water area to be used.

[0041] Second Embodiment Next, a floating structure according to a second embodiment will be described mainly with reference to Figures 2 and 3. In the embodiment described below, the same or similar members and parts as those in the first embodiment described above will be designated by the same reference numerals, and their description will be omitted, and only configurations different from the embodiment will be described.

[0042] Fig. 2 is a perspective view schematically showing a floating structure according to a second embodiment and a third embodiment of the present invention, and Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. As shown in Figures 2 and 3, the floating structure 1A according to this embodiment includes two first motion reducers (motion reducers) 20 and two first motion reducers (motion reducers) 20A. The first motion reducers 20, 20A, first motion reducers 20A and first motion reducers 20 are arranged in parallel in this order. In a plan view, the first openings 21 of the first motion reducers 20 and 20A are substantially rectangular. The long sides of the first openings 21 are arranged parallel to the sides of the floating structure 1A.

[0043] In the first motion reduction section 20A, the second opening 22A is located vertically below the first opening 21. In a plan view, the second opening 22 has a generally rectangular shape and is approximately the same size as the first opening 21. The vertical communication section 26A is shorter than the vertical communication section 26 of the first motion reduction section 20. The second communication section 25A is located at a higher position than the second communication section 25 of the first motion reduction section 20. The seawater level W is located midway between the second communication section 25A in the vertical direction.

[0044] In a plan view, the superstructure 9 is disposed near one end of the rectangular floating structure 1A (the lower left side of the paper in FIG. 2).

[0045] In the floating structure 1A configured in this manner, a first opening 21 is formed in the top surface 11, and second openings 22, 22A are formed in the bottom surface 12. This distributes the direction of action of wave force between the top surface 11 and the bottom surface 12, causing a phase difference in wave force between the seawater in the communication passage 23 and the seawater outside the floating structure 1A, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in a floating structure as in the past, multiple first motion reducers 20, 20A are provided, and since there is a high degree of freedom in the dimensions, the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0046] Furthermore, by changing the height of the second communication portion 25 of the first fluctuation reduction portion 20 and the second communication portion 25A of the first fluctuation reduction portion 20A, a phase difference can be generated between the first fluctuation reduction portion 20 and the first fluctuation reduction portion 20A, thereby reducing fluctuation.

[0047] (Third embodiment) Next, a floating structure according to a third embodiment will be described mainly with reference to FIGS. 2 and 4. FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. As shown in Figures 2 and 4, the floating structure 1B according to this embodiment is provided with two first motion reduction sections (motion reduction sections) 20 and two second motion reduction sections (motion reduction sections) 20B. The first motion reduction sections 20, the second motion reduction sections 20B, the second motion reduction sections 20B and the first motion reduction sections 20 are arranged in parallel in this order. In a plan view, the first openings 21 of the first motion reduction sections 20 and the second motion reduction sections 20B are substantially rectangular. The long sides of the first openings 21 are arranged parallel to the sides of the floating structure 1B.

[0048] In the second motion reduction section 20B, the second opening 22B is located vertically below the first opening 21. In a plan view, the second opening 22B has a generally rectangular shape and is generally the same size as the first opening 21. The first opening 21 and the second opening 22B are connected by a linear communication section (communication passage) 27. The linear communication section 27 is formed linearly so as to extend in the vertical direction.

[0049] In plan view, the superstructure 9 is disposed near one end of the rectangular floating structure 1B (the lower left side of the paper in FIG. 2).

[0050] In the floating structure 1B configured in this manner, a first opening 21 is formed in the top surface 11, and second openings 22, 22B are formed in the bottom surface 12. This distributes the direction of action of wave force between the top surface 11 and the bottom surface 12, causing a phase difference in wave force between the seawater in the communication passage 23 and the linear communication portion 27 and the seawater outside the floating structure 1B, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in a floating structure as in the past, multiple first motion reduction sections 20 and second motion reduction sections 20B are provided, and there is a high degree of freedom in their dimensions, so that the range of wave periods and wave directions that can be reduced can be set widely, enabling motion reduction under a variety of sea conditions.

[0051] In addition, in the second vibration reduction section 20B, the linear communication section 27 has a linear shape extending in the vertical direction. By providing both the first vibration reduction section 20 and the second vibration reduction section 20B, the length of the first vibration reduction section 20 and the length of the second vibration reduction section 20 can be changed, and a phase difference can be generated between the first vibration reduction section 20 and the second vibration reduction section 20B, thereby reducing vibration.

[0052] (Fourth embodiment) Next, a floating structure according to a fourth embodiment will be described mainly with reference to FIGS. Fig. 5 is a perspective view schematically showing the floating structures according to the fourth and fifth embodiments of the present invention, and Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 5. As shown in Figures 5 and 6, the floating structure 1C according to this embodiment is provided with two first motion reducers (motion reducers) 20A and two third motion reducers (motion reducers) 20C. The first motion reducers 20A, the third motion reducer 20C, the third motion reducer 20C, and the first motion reducer 20A are arranged in parallel in this order. In a plan view, the first openings 21 of the first motion reducers 20A and the third motion reducer 20C are substantially rectangular. The long sides of the first openings 21 are arranged parallel to the sides of the floating structure 1C.

[0053] In the third motion reduction section 20C, a water storage chamber (communicating passage) 28 is formed in communication with the first opening 21. The water storage chamber 28 is disposed directly below the first opening 21. A second opening 22C is formed in the side surface 13 of the floating structure 1C so as to be recessed inward. The second opening 22C is communicated with the water storage chamber 28. In this embodiment, four second openings 22C are formed for one water storage chamber 28. Partitions are provided between adjacent second openings 22C. The bottom surface of the water storage chamber 28 is located at a lower position than the second openings 22C. In the third motion reduction section 20C, water may enter through the second openings 22C and be discharged through the first opening 21, or water may enter through the first opening 21 and be discharged through the second openings 22C.

[0054] In a plan view, the superstructure 9 is disposed near one end of the rectangular floating structure 1C (the lower left side of the paper in FIG. 5).

[0055] In the floating structure 1C configured in this manner, a first opening 21 is formed on the top surface 11, a second opening 22A is formed on the bottom surface 12, and a second opening 22C is formed on the side surface 13. This distributes the direction of action of wave force between the top surface 11, the bottom surface 12, and the side surface 13, generating a phase difference in wave force between the seawater in the communication passage 23 and the water retention chamber 28 and the seawater outside the floating structure 1C, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in the floating structure as in the conventional case, multiple first motion reduction sections 20A and third motion reduction sections 20C are provided, and since the dimensions are also highly flexible, the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0056] In addition, in the third motion reduction section 20C, seawater is retained in the water storage chamber 28, thereby reliably creating a phase difference in wave force between the seawater in the water storage chamber 28 and the seawater outside the floating structure 1C, thereby reducing motion.

[0057] Fifth Embodiment Next, a floating structure according to a fifth embodiment will be described mainly with reference to FIGS. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. As shown in Figures 5 and 7, the floating structure 1D according to this embodiment is provided with two first motion reducers (motion reducers) 20A and two third motion reducers (motion reducers) 20D. The first motion reducers 20A, the third motion reducer 20D, the third motion reducer 20D, and the first motion reducer 20A are arranged in parallel in this order. In a plan view, the first openings 21 of the first motion reducers 20A and the third motion reducer 20D are substantially rectangular. The long sides of the first openings 21 are arranged parallel to the sides of the floating structure 1D.

[0058] A bottom hole 31 is formed in the bottom surface 12 of the floating structure 1D. A bottom hole communication passage 32 communicating with the bottom hole 31 is connected to the water retention chamber (communication passage) 28D of the third motion reduction section 20D.

[0059] In the floating structure 1D configured in this manner, a first opening 21 is formed in the top surface 11, a second opening 22A and a bottom hole 31 are formed in the bottom surface 12, and a second opening 22C is formed in the side surface 13. This distributes the direction of action of wave force between the top surface 11, the bottom surface 12, and the side surface 13, generating a phase difference in wave force between the seawater in the communicating passage 23 and the water retention chamber 28 and the seawater outside the floating structure 1D, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in the floating structure as in the conventional structure, multiple first motion reduction sections 20A and third motion reduction sections 20D are provided, and since there is a high degree of freedom in their dimensions, the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0060] In addition, in the third motion reduction section 20D, seawater is retained in the water storage chamber 28, thereby reliably creating a phase difference in wave force between the seawater in the water storage chamber 28 and the seawater outside the floating structure 1D, thereby reducing motion.

[0061] In addition, since the water storage chamber 28 is connected to the bottom hole 31 formed in the bottom surface by the bottom hole connecting passage 32, the load acting on the floating structure 1D due to seawater stagnating in the water storage chamber 28 can be reduced.

[0062] (Sixth embodiment) Next, a floating structure according to a sixth embodiment will be described mainly with reference to FIGS. 8 and 9. FIG. Fig. 8 is a perspective view schematically showing floating structures according to sixth, seventh and eighth embodiments of the present invention, Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 8. 8 and 9, the floating structure 1E according to this embodiment is provided with four third motion reducers (motion reducers) 20C. In a plan view, the long sides of the first openings 21 of the third motion reducers 20C are arranged parallel to the sides of the floating structure 1E. The first openings 21 are arranged along the four sides of the floating structure 1E.

[0063] In a plan view, the superstructure 9 is disposed substantially in the center of the floating structure 1 E. The superstructure 9 is disposed inside the area surrounded by the four first openings 21.

[0064] In the floating structure 1E configured in this manner, a first opening 21 is formed on the top surface 11, and a second opening 22C is formed on the side surface 13. This distributes the direction of action of wave force between the top surface 11 and the side surface 13, generating a phase difference in wave force between the seawater in the water retention chamber 28 and the seawater outside the floating structure 1E, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in a floating structure as in the past, multiple third motion reduction sections 20C are provided, and the dimensions are also highly flexible, so that the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0065] In addition, in the third motion reduction section 20C, seawater is retained in the water storage chamber 28, thereby reliably creating a phase difference in wave force between the seawater in the water storage chamber 28 and the seawater outside the floating structure 1E, thereby reducing motion.

[0066] Seventh Embodiment Next, a floating structure according to a seventh embodiment will be described mainly with reference to Figs. 8 and 10. FIG. 10 is a cross-sectional view taken along line XX in FIG. As shown in Figures 8 and 10, the floating structure 1F according to this embodiment is provided with four third motion reducers (motion reducers) 20D. In a plan view, the long sides of the first openings 21 of the third motion reducers 20D are arranged parallel to the sides of the floating structure 1F. The first openings 21 are arranged along the four sides of the floating structure 1F.

[0067] In a plan view, the superstructure 9 is disposed in approximately the center of the floating structure 1F. The superstructure 9 is disposed inside the area surrounded by the four first openings 21.

[0068] In the floating structure 1F configured in this manner, a first opening 21 is formed in the top surface 11, a bottom hole 31 is formed in the bottom surface 12, and a second opening 22C is formed in the side surface 13. This distributes the direction of action of wave force among the top surface 11, the bottom surface 12, and the side surface 13, generating a phase difference in wave force between the seawater in the water retention chamber 28 and the seawater outside the floating structure 1F, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in the floating structure as in the past, multiple third motion reduction sections 20D are provided, and the dimensions are also highly flexible, so that the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0069] Furthermore, in the third motion reduction section 20D, seawater is retained in the water storage chamber 28, thereby reliably creating a phase difference in wave force between the seawater in the water storage chamber 28 and the seawater outside the floating structure 1F, thereby reducing motion.

[0070] Eighth Embodiment Next, a floating structure according to an eighth embodiment will be described mainly with reference to Figs. 8 and 11. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. As shown in Figures 8 and 11, the floating structure 1G according to this embodiment is provided with four third motion reduction sections (motion reduction sections) 20G. In a plan view, the long sides of the first openings 21 of the third motion reduction sections 20G are arranged parallel to the sides of the floating structure 1G. The first openings 21 are arranged along the four sides of the floating structure 1G. The water retention chambers 28 of opposing third motion reduction sections 20G are connected by a connecting pipe 33.

[0071] In a plan view, the superstructure 9 is disposed substantially in the center of the floating structure 1 G. The superstructure 9 is disposed inside the area surrounded by the four first openings 21.

[0072] In the floating structure 1G configured in this manner, a first opening 21 is formed on the top surface 11, and a second opening 22C is formed on the side surface 13. This distributes the direction of action of wave force between the top surface 11 and the side surface 13, generating a phase difference in wave force between the seawater in the water retention chamber 28 and the seawater outside the floating structure 1G, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in the floating structure as in the past, multiple third motion reduction sections 20G are provided, and the dimensions are also highly flexible, so that the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0073] Furthermore, in the third motion reduction section 20G, seawater is retained in the water storage chamber 28, thereby reliably creating a phase difference in wave force between the seawater in the water storage chamber 28 and the seawater outside the floating structure 1G, thereby reducing motion.

[0074] Furthermore, the water storage chambers 28 of the two third motion reduction sections 20G are connected to each other by a communication pipe 33, so the amount of seawater in the water storage chambers 28 can be adjusted by the two third motion reduction sections 20G.

[0075] Ninth embodiment Next, a floating structure according to a ninth embodiment will be described mainly with reference to FIG. FIG. 12 is a perspective view that schematically shows a floating structure according to a ninth embodiment of the present invention. As shown in FIG. 12, in a floating structure 1H according to the embodiment, a side surface 13H of the floating structure 1H is inclined with respect to a vertical plane so as to be inclined toward the center of the upper surface 11 as it extends upward.

[0076] The floating structure 1H is provided with, for example, four third motion reducers (motion reducers) 20C. The four third motion reducers 20C are arranged in parallel. In a plan view, the long sides of the first openings 21 of the third motion reducers 20C are arranged parallel to the sides of the floating structure 1H. Note that instead of the third motion reducers 20C, third motion reducers 20D and third motion reducers 20G may be provided.

[0077] For example, a plurality of second openings 22C are formed in the water retention chamber 28 of one third motion reduction section 20C. The three second openings 22C are arranged spaced apart in the vertical direction and the width direction of the floating structure 1H. A partition is provided between adjacent second openings 22C.

[0078] In plan view, the superstructure 9 is disposed near one end of the rectangular floating structure 1H (the lower left side of the paper in FIG. 12).

[0079] In the floating structure 1H configured in this manner, a first opening 21 is formed in the top surface 11, and a second opening 22H is formed in the side surface 13H. This distributes the direction of action of wave force between the top surface 11 and the side surface 13H, generating a phase difference in wave force between the seawater in the water retention chamber 28 and the seawater outside the floating structure 1H, thereby reducing motion. Furthermore, instead of a single pool for storing a water mass in the floating structure as in the past, multiple third motion reduction sections 20C are provided, and the dimensions are also highly flexible, so that the range of wave periods and wave directions that can be reduced can be set widely, making it possible to reduce motion under a variety of sea conditions.

[0080] In addition, in the third motion reduction section 20C, seawater is retained in the water storage chamber 28, thereby reliably creating a phase difference in wave force between the seawater in the water storage chamber 28 and the seawater outside the floating structure 1H, thereby reducing motion.

[0081] Furthermore, when the third motion reduction section 20D is provided, the water storage chamber 28 is connected to the bottom hole 31 formed in the bottom surface by the bottom hole connecting passage 32, thereby reducing the load acting on the floating structure 1D due to seawater stagnating in the water storage chamber 28.

[0082] In addition, when a third motion reduction section 20G is provided, the water storage chambers 28 of the two third motion reduction sections 20G are connected to each other by a connecting pipe 33, so that the amount of seawater in the water storage chambers 28 can be adjusted using the two third motion reduction sections 20G.

[0083] In addition, since the side surface 13H is inclined, horizontal wave force is reduced and a vertical downward component is generated, reducing motion. Furthermore, when waves collide with the side surface 13H, the direction and duration of action of the wave force can be dispersed compared to when the side surface is aligned vertically.

[0084] The assembly procedures, shapes and combinations of the components, etc. shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0085] For example, by combining the second opening 22 for motion reduction, the communication passage 23, the water chamber 28, and the communication pipe 33, motion reduction measures suitable for the sea conditions and the wind turbine load can be planned.

[0086] Furthermore, since the second opening 22 can be positioned under various conditions, the wind turbine can be installed not only in the center of the floating structure 1 but also on the end side of the floating structure 1, etc., providing a high degree of freedom.

[0087] Furthermore, in the second embodiment, the first motion reduction section 20 and the first motion reduction section 20A may be connected by a connecting pipe. In the third embodiment, the first motion reduction section 20 and the second motion reduction section 20B may be connected by a connecting pipe. In the fourth embodiment, the first motion reduction section 20A and the third motion reduction section 20C may be connected by a connecting pipe. In the fifth embodiment, the first motion reduction section 20A and the third motion reduction section 20D may be connected by a connecting pipe. In the seventh embodiment, the third motion reduction sections 20D may be connected by a connecting pipe.

[0088] The shapes and positions of the first opening 21 and the second opening 22 can be set as appropriate. The first openings 21 may be concentrated in the center of the upper surface 11 of the floating structure 1, and the superstructure 9 may be installed along the outer edge of the floating structure 1.

[0089] In addition, in the above-described embodiment, a plurality of motion reducers are provided for the floating structure, but the present invention is not limited to this. Only one motion reducer may be provided for the floating structure.

[0090] In the embodiment described above, the first opening 21 is formed on the upper surface 11 of the floating structure 1 and is located above the seawater level W, but the present invention is not limited to this. The first opening may be formed on the side surface of the floating structure, and in this case, the first opening may be located above the seawater level, may be located underwater, or may be located from above the seawater level to underwater. [Explanation of symbols]

[0091] 1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H Floating structure 9 Superstructure 11 Top side 12 Bottom 13,13H side 20, 20A First vibration damper, vibration damper 20B second vibration reduction unit, vibration reduction unit 20C, 20D, 20G Third vibration reduction unit, vibration reduction unit 21 First opening 22,22A,22B,22C Second opening 23 Communication path 24 First communication section 25,25A Second communication part 26,26A Upper and lower communication part 27 Straight communication section (communication path) 28, 28D Water storage chamber (connecting passage) 31 Bottom hole 33 Communication pipe W sea level

Claims

1. A floating structure with a superstructure fixed to the top, a first opening formed in one of the top surface, the side surface, and the bottom surface; a second opening formed in the other of the top surface, the side surface, and the bottom surface; a plurality of vibration reducers each having a communication passage communicating the first opening and the second opening; In a first vibration reduction unit among the plurality of vibration reduction units, The second opening is formed in the bottom surface, The communication passage is a first communication portion extending laterally from the first opening; a second communication portion extending laterally from the second opening; a vertical communication portion that connects the first communication portion and the second communication portion and extends in the vertical direction, A plurality of the first vibration reduction units are provided, A floating structure in which, among the plurality of first motion reduction sections, the height of the second communication section of one of the first motion reduction sections is different from the height of the second communication section of another of the first motion reduction sections.

2. In a second vibration reduction unit among the plurality of vibration reduction units, the second opening is formed on the bottom surface directly below the first opening, The floating structure according to claim 1 , wherein the communication passage has a linear communication portion that connects the first opening and the second opening and extends in the vertical direction.

3. In a third vibration reduction unit among the plurality of vibration reduction units, The second opening is formed in the side surface, The floating structure according to claim 1 or 2, wherein a water chamber is formed in the communication passage and is located at a position lower than the second opening.

4. In the third fluctuation reduction unit, A bottom hole is formed in the bottom surface, The floating structure according to claim 3, wherein the water retention chamber is in communication with the bottom hole.

5. a plurality of the third vibration reduction units; 5. The floating structure according to claim 3, wherein the water retention chambers of the plurality of third motion reduction sections are connected to each other by a connecting pipe.

6. The floating structure according to claim 1 , wherein the side surface is inclined with respect to a vertical plane so as to extend upward toward the center of the upper surface.

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