Floating offshore wind power plants

Abstract

To achieve significant reduction of the number of work days and provide an efficient construction method on land by utilizing techniques cultivated in construction work of a skyscraper etc. to build a floating offshore wind farm, launching the floating offshore wind farm assembled on land, and towing the floating offshore wind farm to a work side by a tugboat.SOLUTION: A tower part disposed on the ocean and a buoyancy body part disposed in water are built by reinforced-concrete structures, the tower part and the buoyancy body part are connected by a plurality of pillars, and a floating offshore wind farm is moored to a plurality of seabed foundation piles fixed to the seabed by a plurality of mooring wires. The floating offshore wind farm is provided to achieve the above object.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a floating offshore wind power plant with a reinforced concrete structure.

Background Art

[0002] In recent years, with the increasing use of renewable energy, it is expected that stable power can be obtained from offshore wind power because there are no obstacles blocking the wind at sea and the wind direction and speed are constant. Currently, the structure of the offshore wind power generation devices that have been put into practical use is the same as that of the devices operating on land. Since there are fewer restrictions on installing wind power generation devices at sea than on land, it is considered that the installation at sea will increase in the future.

[0003] Currently, in the case of the fixed-bottom type where the support column of the offshore wind power generation device popular in Europe reaches the seabed, it is suitable for relatively shallow water depths of about 50 m. However, in the case of Japan, since the area of the continental shelf with relatively shallow water depth is small, in Japan, the wind power generation device is being shifted to a floating type that floats on the sea and maintains its position by being moored to the seabed with a chain, wire rope, etc.

[0004] A floating offshore wind power generation device is composed of a floating body arranged in water and a tower erected on the floating body, and is equipped with a wind power generation device composed of a nacelle and blades at the top of the tower. The methods for mooring a floating offshore wind power generation device to the seabed mainly include four types: the spar type, the semi-submersible type, the barge type, and the TLP type.

[0005] Currently, higher output per device is required, and accordingly, it is necessary to increase the length of the blades to increase the windward area of the wind turbine body. Currently, large offshore wind power generation devices with blade lengths exceeding 80 m are being put into practical use.

[0006] Traditionally, in order to install a floating offshore wind power generation device in a designated sea area, the floating structure was towed to the installation area by a barge or similar vessel and moored there, and then the superstructure was moved to the upper end of the floating structure using a crane ship or similar vessel, and the floating structure and the superstructure were connected. [Overview of the project] [Problems that the invention aims to solve]

[0007] However, the sea areas with depths of 50 meters or more where floating offshore wind turbines are installed often have more severe oceanographic conditions than areas where general marine construction is carried out. As a result, the installation work for floating offshore wind turbines must be carried out during relatively calm periods under severe oceanographic conditions, which limits the timing and duration of the installation work.

[0008] Furthermore, the installation of floating offshore wind turbines requires delicate work using large work vessels, which leads to increased construction costs.

[0009] In light of the above situation, the present invention aims to significantly shorten construction time and provide an efficient construction method on land by constructing facilities for building floating offshore wind power plants on the coast near the sea where floating offshore wind power plants are to be installed, constructing floating offshore wind power plants utilizing technologies cultivated in construction work for skyscrapers and the like, and then floating the floating offshore wind power plants assembled on land onto the water and towing them to the site by tugboats or the like. [Means for solving the problem]

[0010] To solve these problems, the invention described in claim 1 is a floating offshore wind power generation system consisting of a tower supporting a nacelle containing multiple blades, a gearbox, and a generator. place In that, located at sea do Tower section (4) is constructed as a roughly conical reinforced concrete structure, the top part (33) is formed as a circular plane, a steel pipe (23) for attaching the nacelle is attached to the top part (33), the upper diameter (A) of the tower section of the top part (33) is formed as a circle of 5m, the upper slab thickness (B) of the tower section of the top part (33) is formed as 500mm, the height (C) of the tower section (4) from the top part (33) to the bottom part (39) of the tower section (4) is formed as 97m, the lower part of the tower section (4) is composed of a four-story building (5) with each floor having a height of 5m, the bottom of the tower section (4) is formed as a tower bottom slab thickness (D) of 1m, and the lower part of the tower section (4) is formed as a circular tower with a diameter of 25m. Placed underwater do buoyant body part (8) is generally cylindrical and constructed of reinforced concrete, and is hollow inside in order to serve as a floating body for the floating offshore wind power plant (1) to float on the ocean, and the thickness of the outer skin of the reinforced concrete outer surface and upper and lower surfaces of the buoyancy body (8) is 200 mm on all surfaces, upper, lower and outer surfaces, and the front and rear bottoms of the buoyancy body (8) are formed in a shape that slopes forward and backward, and the diameter (N) of the buoyancy body (8) is formed as a cylinder of 100 m, and the height (J) of the buoyancy body (8) excluding the forward sloping section (31) and rear sloping section (32) is 10 m, and the height (K) of the tip of the forward sloping section (31) and rear sloping section (32) of the buoyancy body (8) The rear end height (R) of the rearward inclined section is formed to be 3m, and the angle of the front inclined section (M) and the angle of the rearward inclined section (P) of the front inclined section (31) and the rearward inclined section (32) are both formed to be 14 degrees with respect to the bottom surface, and the maximum width (L) of the front inclined section (31) and the maximum width (Q) of the rearward inclined section (32) are both formed to be 12m, and six mooring wires (A)(11), mooring wires (B)(12), mooring wires (C)(13), mooring wires (D)(14), mooring wires (E)(15), and mooring wires (F)(16) are attached to the side of the buoyancy body section (8). To guide the buoyancy body (8) to a fixed position on its side, six mooring wire guide holes (A)(25), mooring wire guide holes (B)(26), mooring wire guide holes (C)(27), mooring wire guide holes (D)(28), mooring wire guide holes (E)(29), and mooring wire guide holes (F)(30), which are formed in a roughly semi-cylindrical shape with a radius of 30 cm, are formed vertically on the side of the buoyancy body (8) that radiate outwards at 60-degree intervals from the center when viewed on the horizontal plane of the upper surface of the buoyancy body (8), and the resistance from waves on the sea surface is minimized, and the buoyancy body To suppress the swaying of the Type 1 offshore wind power plant, the eight support columns (6) connecting the tower section (4) and the buoyancy section (8) are both formed from cylindrical steel pipes with a diameter of 2m, a wall thickness of 30mm, and a length of 10m. The eight support columns (A)(45), (B)(46), (C)(47), (D)(48), (E)(49), (F)(50), (G)(51), and (H)(52) are vertically mounted so that their centers are located at positions that radiate outwards from the center at 45-degree intervals when viewed in the horizontal plane, on a circumference with a radius of 1050cm from the center of the upper surface of the buoyancy section (8). Both consist of a support column (6) attached to the underside of the tower base (39) at the top of eight support columns (A)(45), support columns (B)(46), support columns (C)(47), support columns (D)(48), support columns (E)(49), support columns (F)(50), support columns (G)(51), and support columns (H)(52); a vertical shaft compartment (34) formed in the shape of a cylinder with a diameter of 4m, which penetrates from roughly the top (33) of the tower section (4) through the tower base (39) to roughly the bottom of the center of the buoyancy body section (8); and six seabed foundation piles (A)(17) fixed to the seabed (9) in order to moor the floating offshore wind power plant (1) to the seabed (9) in a TLP type configuration.Six mooring wires (A)(11), mooring wire (B)(12), mooring wire (C)(13), mooring wire (D)(14), mooring wire (E)(15), and mooring wire (F)(16) are attached to each of the submarine foundation piles (B)(18), submarine foundation pile (C)(19), submarine foundation pile (D)(20), submarine foundation pile (E)(21), and submarine foundation pile (F)(22), respectively, so that the position of the sea surface (7) is approximately in the vertical center of the support pillar (6). (14) Wire winding and releasing machines (60) for winding and releasing mooring wires (E)(15) and mooring wires (F)(16) individually are evenly distributed on the circumference near the side of the vertical shaft compartment (34) inside the first floor (38) of the building, and one end of the mooring wires, which has been passed through guide holes for mooring wires formed on the side of the buoyancy body (8), is pulled into the building of the tower section (4) via a wire pulley, and the length of each mooring wire is adjusted to forcibly submerge the buoyancy body (8) so that it remains horizontal to the sea surface (7), thereby creating a floating offshore wind power plant. (1) is configured to minimize pitching and rolling relative to the sea surface (7) and maintain a horizontal position. It is characterized by the following. [Effects of the Invention]

[0015] According to the invention described in claim 1, a floating offshore wind power generation system is provided, which consists of a tower supporting a nacelle containing multiple blades, a gearbox, and a generator. place In that, located at sea do Tower section (4) is constructed as a roughly conical reinforced concrete structure, the top part (33) is formed as a circular plane, a steel pipe (23) for attaching the nacelle is attached to the top part (33), the upper diameter (A) of the tower section of the top part (33) is formed as a circle of 5m, the upper slab thickness (B) of the tower section of the top part (33) is formed as 500mm, the height (C) of the tower section (4) from the top part (33) to the tower base (39) is formed as 97m, the lower part of the tower section (4) is composed of a four-story building (5) with each floor having a height of 5m, the tower base slab thickness (D) of the bottom of the tower section (4) is formed as 1m, and the lower part of the tower section (4) has a tower base diameter (S) formed as a circle with a diameter of 25m, Placed underwater do buoyant body part (8) is generally cylindrical and constructed of reinforced concrete, and is made hollow inside in order to serve as a floating body that will keep the floating offshore wind power plant (1) afloat on the ocean, and the buoyancy body The outer thickness of the reinforced concrete outer surface and upper and lower surfaces of section (8) is 200 mm for the upper, lower, and outer surfaces. Furthermore, the front and rear bottoms of the buoyancy body section (8) are formed in a shape that slopes forward and backward. Furthermore, the diameter (N) of the buoyancy body section (8) is formed as a cylinder with a diameter of 100 mm. Furthermore, the height (J) of the buoyancy body section (8), excluding the forward-sloping section (31) and the rear-sloping section (32), is 10 m. Furthermore, the height (K) of the front-sloping tip and the height (R) of the rear-sloping section of the forward-sloping section (31) and rear-sloping section (32) of the buoyancy body section (8) are both 3 m. Furthermore, the forward inclined section (31) and the rear inclined section (32) are formed at an angle of 14 degrees to the bottom surface, the maximum width (L) of the forward inclined section (31) and the maximum width (Q) of the rear inclined section (32) are both formed at 12m, and furthermore, six mooring wires (A)(11), mooring wires (B)(12), mooring wires (C)(13), mooring wires (D)(14), mooring wires (E)(15), and mooring wires (F)(16) are guided to fixed positions on the side of the buoyancy body (8). The buoyancy body (8) is formed vertically on the side of the buoyancy body (8), which radiates radially from the center at 60-degree intervals when viewed on the horizontal plane of the upper surface of the buoyancy body (8), and in order to minimize resistance from waves on the sea surface and suppress the swaying of the floating offshore wind power plant (1), the tower section The eight support columns (6) for connecting (4) and the buoyancy body (8) are all made of cylindrical steel pipes with a diameter of 2m, a wall thickness of 30mm, and a length of 10m. They are vertically mounted so that the centers of the eight support columns (A)(45), (B)(46), (C)(47), (D)(48), (E)(49), (F)(50), (G)(51), and (H)(52) are located at positions that radiate outwards from the center at 45-degree intervals when viewed in the horizontal plane, on a circle with a radius of 1050cm from the center of the upper surface of the buoyancy body (8).Supports (C)(47), (D)(48), (E)(49), (F)(50), (G)(51), and (H)(52) are attached to the lower surface of the tower base (39) by a support (6); a vertical shaft compartment (34) formed in the shape of a cylinder with a diameter of 4m, extending from approximately the top (33) of the tower section (4) through the tower base (39) to approximately the bottom of the central part of the buoyancy body section (8); and six seabed foundation piles (A)(17), seabed foundation piles (B)(18), and seabed foundation piles (C)(19) fixed to the seabed (9) in order to moor the floating offshore wind power plant (1) to the seabed (9) in a TLP (Territorial Load) type. Six mooring wires (A)(11), mooring wires (B)(12), mooring wires (C)(13), mooring wires (D)(14), mooring wires (E)(15), and mooring wires (F)(16) are attached to each of the seabed foundation piles (D)(20), seabed foundation piles (E)(21), and seabed foundation piles (F)(22), respectively, so that the position of the sea surface (7) is approximately in the vertical center of the support pillars (6), and the six mooring wires (A)(11), mooring wires (B)(12), mooring wires (C)(13), mooring wires (D)(14), mooring wires (E)(15), and mooring wires, Wire winding and releasing machines (60) for individually winding and releasing (F)(16) are evenly distributed on the circumference near the side of the vertical shaft compartment (34) inside the first floor (38) of the building. One end of the mooring wire, which passes through guide holes for mooring wires formed on the side of the buoyancy body (8), is pulled into the building of the tower section (4) via a wire pulley. By adjusting the length of each mooring wire, the buoyancy body (8) is forcibly submerged in the water to maintain a horizontal position relative to the sea surface (7), thereby configuring the floating offshore wind power plant (1) to minimize vertical and horizontal swaying relative to the sea surface (7) and maintain a horizontal state. By doing so, we were able to utilize the technology cultivated in the construction of skyscrapers and other buildings, significantly shortening the production time and lowering construction costs. [Examples]

[0020] Embodiments of this invention will be described below. [Modes for carrying out the invention]

[0021] Figures 1 to 7 show embodiments of this invention.

[0022] Figure 1 is a perspective view showing the floating offshore wind power plant 1 of the present invention installed offshore. The floating offshore wind power plant 1 consists of three blades 2, each approximately 80m long, attached to a hub 10, a speed increaser, generator, yaw control device, etc., installed inside a nacelle 3, a steel pipe 23 for fixing the nacelle 3 to the tower section 4, a tower section 4 constructed of reinforced concrete, eight support columns 6 formed from steel pipes approximately 2m in diameter, 30mm thick, and 10m long to connect the tower section 4 and the buoyancy section 8, and a buoyancy section 8, which is made of reinforced concrete with a hollow interior, to float the floating offshore wind power plant 1 on the sea and make it self-supporting, and the amount of oscillation of the buoyancy section 8 configured in this way To minimize wobbling, the TLP type is used to moor to the seabed 9, and it consists of six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16, and to fix the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 to the seabed 9, it consists of six seabed foundation piles (A) 17, seabed foundation pile (B) 18, seabed foundation pile (C) 19, seabed foundation pile (D) 20, seabed foundation pile (E) 21, and seabed foundation pile (F) 22 fixed to the seabed 9. The electricity generated by the floating offshore wind power plant 1 configured in this way is sent to a land-based switch station (not shown) via a submarine transmission cable 24 laid on the seabed 9, and then connected to the transmission lines of the general land-based power grid. Since the nacelle 3 attached to the steel pipe 23 needs to always face the direction of the wind, a yaw control device (not shown) is installed inside the nacelle 3 so that it can rotate 360 ​​degrees relative to the steel pipe 23.

[0023] Figure 2 shows a front view of the floating offshore wind power plant 1 described in Figure 1. In this invention, the floating offshore wind power plant 1 is moored to the seabed 9 in a TLP (Terrestrial Lifting Plant) type configuration. Six mooring wires (A) 11, (B) 12, (C) 19, (D) 20, (E) 21, and (F) 22 are fixed to the seabed 9, and six mooring wires (A) 11, (B) 12, (C) 13, (D) 14, (E) 15, and (F) 16 are attached to each of them, and the position of the sea surface 7 is approximately in the vertical center of the support pillars 6. By adjusting the lengths of each mooring wire (B)12, mooring wire (C)13, mooring wire (D)14, mooring wire (E)15, and mooring wire (F)16 using the wire pulley (B)62, wire pulley (A)61, and wire winding / feeding machine 60, as explained in Figure 7, the buoyancy body 8 is forcibly submerged in the water to maintain a horizontal position relative to the sea surface 7. This makes it possible to minimize vertical and horizontal swaying relative to the sea surface 7 and maintain a horizontal state, allowing the blades 2 to rotate in a stable state relative to the wind.

[0024] Figure 3 shows the tower section 4, support columns 6, and buoyancy section 8 described in Figures 1 and 2, in a plan view (Figure 3a) and a front view (Figure 3b). The tower section 4 is constructed of a generally conical reinforced concrete structure, and the top section 33 is formed as a circle with a diameter of approximately 5 m, as shown by the tower section top diameter A in Figure 6. The thickness of the tower section top slab B is approximately 500 mm, the height of the tower section C from the top section 33 to the tower base 39 is approximately 97 m, the thickness of the tower base slab D that constitutes the tower section base 40 of the tower section 4 is approximately 1 m, and the diameter S of the tower section base that constitutes the tower section base 40 is circular with a diameter of approximately 25 m. Below the tower section 4, a building 5 is constructed with a four-story structure (shown as building 1st floor 38, building 2nd floor 37, building 3rd floor 36, and building 4th floor 35) with each floor having a height of approximately 5 m. The buoyancy body 8 is generally cylindrical and has a hollow interior to serve as a floating structure for the floating offshore wind power plant 1 to float on the ocean. As shown in Figure 6, the buoyancy body 8 has a diameter N of approximately 100m and a height J of approximately 10m. Furthermore, as shown in Figure 3, the bottom surface of the buoyancy body 8 has forward-sloping sections 31 (bottom and forward slope) at both the front and rear ends to ensure that the floating offshore wind power plant 1, constructed on land, floats stably on the water. The structure is formed with the front and rear ends inclined at angles of approximately 14 degrees, as shown by the forward inclination angle M and the rear inclination angle R in Figure 6, as indicated by the forward inclination angle M and the rear inclination angle R in Figure 6, respectively, as shown by the dashed line (A) 41 in Figure 3a, indicating the boundary with section 31, and the dashed line (B) 42 in Figure 3a, indicating the boundary between the bottom and the rear inclined section 32. Furthermore, the tower section 4 and the buoyancy section 8 are connected by eight support columns 6 formed from steel pipes with a diameter of approximately 2m, a wall thickness of approximately 30mm, and a length of approximately 10m.

[0025] Furthermore, on the side surface of the buoyancy body portion 8, six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 described in FIGS. 1 and 2 are guided at fixed positions on the side surface of the buoyancy body portion 8. Therefore, six mooring wire guide holes (A) 25, mooring wire guide holes (B) 26, mooring wire guide holes (C) 27, mooring wire guide holes (D) 28, mooring wire guide holes (E) 29, and mooring wire guide holes (F) 30, which are formed in a substantially semi-cylindrical shape (kamaboko shape) with a radius of about 30 cm, are vertically formed at positions on the side surface of the buoyancy body portion 8 that extend radially at 60-degree intervals from the center when viewed from the horizontal plane of the upper surface of the buoyancy body portion 8.

[0026] Furthermore, a vertical hole section 34, which penetrates from approximately the top part 33 to the tower bottom 39 of the tower portion 4 and is formed in a substantially cylindrical shape with a diameter of about 4 m as shown by the dashed-dotted line (C) 43 to approximately the bottom of the center part of the buoyancy body portion 8, is constructed. Additionally, by installing a staircase for vertical movement (not shown) and a simple lift (not shown) for inspection work inside the vertical hole section 34, it has become possible to improve the work efficiency.

[0027] FIG. 4 shows the support column 6 and the buoyancy body portion 8 described in FIGS. 1 and 2 in a plan view of FIG. ৪a and a front view of FIG. ৪b. Six mooring wire guide holes (A) 25, mooring wire guide holes (B) 26, mooring wire guide holes (C) 27, mooring wire guide holes (D) 28, mooring wire guide holes (E) 29, and mooring wire guide holes (F) 30 formed on the outer peripheral portion of the buoyancy body portion 8 are vertically formed at positions on the side surface of the buoyancy body portion 8 that extend radially at 60-degree intervals from the center when viewed from the horizontal plane of the upper surface of the buoyancy body portion 8. The shapes of the mooring wire guide holes (A) 25, mooring wire guide holes (B) 26, mooring wire guide holes (C) 27, mooring wire guide holes (D) 28, mooring wire guide holes (E) 29, and mooring wire guide holes (F) 30 are all formed in a substantially semi-cylindrical shape (kamaboko shape) with a radius of about 30 cm.

[0028] Furthermore, the eight support columns 6 for connecting the tower section 4 and the buoyancy section 8 are all formed from cylindrical steel pipes with a diameter of approximately 2m, a wall thickness of 30mm, and a length of 10m, and the buoyancy section 8 Eight support columns (A)45, (B)46, (C)47, (D)48, (E)49, (F)50, (G)51, and (H)52 are vertically mounted so that their centers are located at positions that radiate outwards from the center at 45-degree intervals when viewed from the center in a horizontal plane, on a circle with a radius of approximately 1050 cm from the center of the top surface. The upper parts of the eight support columns (A)45, (B)46, (C)47, (D)48, (E)49, (F)50, (G)51, and (H)52 are attached to the lower surface of the tower base 39 as explained in Figure 3. The reason for connecting the tower section 4 and the buoyancy section 8 with eight support columns 6 is to minimize resistance from waves on the sea surface by supporting the tower section 4 with cylindrical, round support columns, thereby suppressing the swaying of the floating offshore wind power plant 1.

[0029] Figure 5 shows six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 for mooring the buoyancy body 8 described in FIGS. 1 and 2 to the seabed 9, as shown in the plan view of FIG. 5a and the front view of FIG. 5b. The six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 are passed through six mooring wire guide holes (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, and mooring wire guide hole (F) 30 formed vertically on the side surface of the buoyancy body 8. For each individual mooring wire, by adjusting the length with a wire pulley (B) 62, a wire pulley (A) 61, and a wire winding and feeding machine 60 shown in FIG. 7 so that the sea surface 7 described in FIG. 2 is approximately at the vertical center position of the support column 6, the horizontal state of the floating offshore wind power plant 1 can be easily maintained. The positional relationship between the six mooring wire guide holes (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, mooring wire guide hole (F) 30 and the six subsea foundation piles (A) 17, subsea foundation pile (B) 18, subsea foundation pile (C) 19, subsea foundation pile (D) 20, subsea foundation pile (E) 21, subsea foundation pile (F) 22 is such that in order to suppress the swaying amount of the buoyancy body 8 caused by the sea current and waves as much as possible, the six subsea foundation piles (A) 17, subsea foundation pile (B) 18, subsea foundation pile (C) 19, subsea foundation pile (D) 20, subsea foundation pile (E) 21, subsea foundation pile (F) 22 are fixed to the seabed directly below the six mooring wire guide holes (A) 25, mooring wire guide hole (B) 26, mooring wire guide hole (C) 27, mooring wire guide hole (D) 28, mooring wire guide hole (E) 29, mooring wire guide hole (F) 30, making it possible to suppress the occupied area below the sea surface, which is one of the characteristics of the TLP type.

[0030] Figure 6 shows the dimensions and angles of the members of the tower section 4, support column 6, and buoyancy body section 8 described in Figures 1 and 2, indicated by symbols A to S. The tower section 4 is generally conical in shape, and the top section 33 is formed as a circular plane. The diameter of the top section 33 is approximately 5 m, and the thickness B of the top section slab is approximately 500 mm. Furthermore, as shown by the dashed line (C) 43, the vertical shaft section 34 is formed as a cylindrical shape with a diameter of approximately 4 m and a length of approximately 116.3 m, extending from approximately the upper end of the tower section 33 through the tower base 40 to approximately the lower end of the buoyancy body section 8. Furthermore, the height C of the tower section 4, from the top 33 to the bottom 39, is approximately 97m. The four-story building 5 is formed with the height F of the fourth floor approximately 5m, the height G of the third floor approximately 5m, the height H of the second floor approximately 5m, and the height I of the first floor approximately 5m. The thickness D of the tower bottom slab at the base of the tower section 4 is approximately 1m, and the diameter S of the tower base at the bottom of the tower section 4 is formed as a circle with a diameter of approximately 25m. Furthermore, the height E of all eight support columns 6 is approximately 10m, and the thickness of the outer skin of the reinforced concrete outer surface and upper and lower surfaces of the buoyancy body 8, which is constructed of reinforced concrete, is approximately 200mm for the upper, lower, and outer surfaces, and the front and rear bottoms of the buoyancy body 8 are formed in a shape that slopes toward the front and rear, and the diameter N of the buoyancy body 8 is formed in a cylindrical shape of approximately 100m, and furthermore, the buoyancy body 8 excluding the forward-sloping section 31 and rear-sloping section 32 as explained in Figure 3 The height J is approximately 10m, and the height K of the front inclined tip and the height R of the rear inclined tip of the buoyancy body section 8, as explained in Figure 3, are both approximately 3m. Furthermore, the angle M of the front inclined section and the angle P of the rear inclined section of the front inclined section 31 and rear inclined section 32, as explained in Figure 3, are both approximately 14 degrees with respect to the bottom surface, and the maximum width L of the front inclined section 31 and the maximum width Q of the rear inclined section 32 are both approximately 12m. In this way, by constructing the center of the tower section 4, the centers of the eight support columns 6, and the center of the buoyancy body section 8 in a straight line, the center of gravity of the floating offshore wind power plant 1 can be positioned at the center of the tower section 4 and the buoyancy body section 8, and the floating offshore wind power plant 1 can maintain a well-balanced horizontal state with respect to the sea surface.

[0031] Figure 7 is a partial cross-sectional view showing one of the six mooring wires (A) 11, (B) 12, (C) 13, (D) 14, (E) 15, and (F) 16 described in Figure 5, mooring wire (C) 13, as a representative, wound onto the wire winding / discharging machine 60 via the guide hole (B) 26 for mooring wires in the buoyancy body section 8. The mooring wire (C) 13 attached to the seabed foundation pile (C) 19 passes through a guide hole (B) 26 for mooring wires formed on the side of the buoyancy body section 8 as described in Figure 5, then through a wire pulley (B) 62 attached near the guide hole (B) 26 on the upper surface of the buoyancy body section 8, then through a wire pulley (A) 61 attached to the upper surface of the buoyancy body section 8 near the outside of the vertical shaft compartment 34, and then through a wire passage hole 63 that penetrates the tower base 40 directly above the wire pulley (A) 61, and is attached to a wire winding and sending machine 60 attached near the outside of the vertical shaft compartment 34 inside the first floor 38 of the building. By winding or releasing the mooring wire (C) 13 configured in this way using the wire winding / releasing machine 60 to adjust its length, it becomes possible to easily adjust the vertical height of the floating offshore wind power plant 1 relative to the sea surface 7 and the inclination of the buoyancy body 8. By evenly distributing the wire winding / releasing machines 60 for individually winding and releasing the six mooring wires (A) 11, mooring wire (B) 12, mooring wire (C) 13, mooring wire (D) 14, mooring wire (E) 15, and mooring wire (F) 16 on the circumference near the side of the vertical shaft compartment 34 inside the first floor 38 of the building, the space inside the first floor 38 of the building can be used efficiently, and maintenance of the wire winding / releasing machines 60 can be performed rationally.

[0032] In addition, while Figure 7 describes the mooring wire (C) 13 as explained in Figures 1 and 2, the other five mooring wires (A) 11, (B) 12, (D) 14, (E) 15, and (F) 16 can also be easily maintained in a horizontal position by using wire pulleys and wire winding / feeding machines to adjust the length of each mooring wire, similar to mooring wire (C) 13.

[0033] Although the floating offshore wind power plant according to the present invention has been described in detail based on the embodiments described above, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention, and will of course remain within the technical scope of the present invention.

[0034] In Figures 1 and 2, six mooring wires (A) 11, (B) 12, (C) 13, (D) 14, (E) 15, and (F) 16 are described as being used to anchor the buoyancy body 8 to the seabed 9. However, the six mooring wires are not limited to wire ropes; they can, of course, also be made of synthetic fiber ropes or steel chains.

[0035] In Figure 1, it was explained that the support column 6 was formed from a steel pipe with a diameter of approximately 2m, a wall thickness of approximately 30mm, and a length of approximately 10m. However, it is also possible to form it from a cylindrical reinforced concrete structure with a diameter of approximately 2m, a thickness of approximately 20cm, and a length of approximately 10m.

[0036] In Figure 7, it was explained that "by adjusting the length of the mooring wire (C) 13 configured in this way using the wire winding and releasing machine 60, it became possible to easily adjust the vertical height and inclination of the floating offshore wind power plant 1 relative to the sea surface 7." Of course, it is also possible to adjust the buoyancy of the buoyancy body 8 to the desired buoyancy by injecting and discharging ballast water (seawater) into and out of a ballast water tank (not shown) installed inside the buoyancy body 8. [Brief explanation of the drawing]

[0037] [Figure 1] A floating offshore wind power plant according to an embodiment of the present invention is shown in a perspective view. [Figure 2] A front view of the floating offshore wind power plant shown in Figure 1, according to the same embodiment, is shown. [Figure 3] The tower section, support column, and buoyancy body section according to the same embodiment are shown in a plan view and a front view. [Figure 4] The support column and buoyancy body according to the same embodiment are shown in a plan view and a front view. [Figure 5] The buoyancy body shown in Figure 4, according to the same embodiment, is shown in a plan view and a front view in a state where it is fixed to the seabed with seabed foundation piles. [Figure 6] The tower section, support column, and buoyancy body section according to the same embodiment are shown in a front view. [Figure 7] The method for adjusting the length of the mooring wire according to the same embodiment is shown in the front view. [Explanation of Symbols]

[0038] A. Upper diameter of the tower section B. Upper slab thickness of the tower section C Tower section height D Tower base slab thickness E. Post height Building F, 4 stories high G Building, 3 stories high H Building, 2nd floor height I. Height of the first floor of the building J Buoyancy section height K Front inclined tip height L Maximum width of front slope M Front slope angle N Buoyant body diameter P Back slope angle Q Maximum width of rear slope R Rear end height of the rearward inclined section S Tower base diameter 1. Floating offshore wind power plant 2 Blades 3 Nasser 4. Tower section 5 buildings 6 pillars 7 sea level 8 Buoyant body 9 Undersea 10 Hubs 11. Mooring wire (A) 12. Mooring wire (B) 13. Mooring wire (C) 14. Mooring wire (D) 15. Mooring wire (E) 16. Mooring wire (F) 17 Submarine foundation pile (A) 18 Submarine foundation pile (B) 19 Submarine foundation pile (C) 20 Submarine foundation pile (D) 21. Submarine foundation piles (E) 22 Submarine foundation pile (F) 23 Steel pipe 24 Submarine power transmission cables 25 Guide hole for mooring wire (A) 26 Guide hole for mooring wire (B) 27 Guide hole for mooring wire (C) 28 Guide hole for mooring wire (D) 29 Guide hole for mooring wire (E) 30 Guide holes for mooring wires (F) 31 Front slope 32 Rear slope 33 Top 34 Vertical shaft compartments 35th floor of building 4 36 Building, 3rd floor 37 Building, 2nd floor 38 Building, 1st floor 39 Tower base 40 Tower base 41 Dot-dashed line (A) 42 Dot-dashed line (B) 43 Dot-dashed line (C) 45 Support Post (A) 46 Pillar (B) 47 Pillar (C) 48 Pillar (D) 49 Pillar (E) 50 Pillar (F) 51 Pillar (G) 52 Pillar (H) 60 Wire winding and feeding machines 61 Wire pulley (A) 62 Wire pulley (B) 63 wire threading holes

Claims

[Claim 1] In a floating offshore wind power plant, which consists of a tower supporting a nacelle containing multiple blades, gearboxes, and generators, The tower section (4) to be placed offshore is constructed of a roughly conical reinforced concrete structure, with the top section (33) formed as a circular plane, a steel pipe (23) for attaching the nacelle to the top section (33) is attached to the top section (33), the upper diameter (A) of the tower section at the top section (33) is formed as a circle of 5m, the upper slab thickness (B) of the tower section at the top section (33) is formed as 500mm, the height (C) of the tower section (4) from the top section (33) to the tower base (39) is formed as 97m, the lower part of the tower section (4) is composed of a four-story building (5) with each floor having a height of 5m, the tower base slab thickness (D) of the bottom of the tower section (4) is formed as 1m, and the lower part of the tower section base (S) is formed as a circle with a diameter of 25m. The buoyancy body (8) placed in the water is generally cylindrical and constructed of reinforced concrete. To serve as a floating structure for the floating offshore wind power plant (1) on the ocean, its interior is hollow. The thickness of the outer skin of the reinforced concrete outer surface and upper and lower surfaces of the buoyancy body (8) is 200 mm for the upper, lower, and outer surfaces. Furthermore, the front and rear bottoms of the buoyancy body (8) are formed with a shape that slopes forward and backward. (N) is formed in a 100m cylindrical shape, and the height (J) of the buoyancy body (8), excluding the forward inclined section (31) and the rear inclined section (32), is formed at 10m, and the height (K) of the tip of the forward inclined section (31) and the height (R) of the rear inclined section (32) of the buoyancy body (8) are both formed at 3m, and the angle (M) of the forward inclined section (31) and the angle (P) of the rear inclined section (32) are both 1 with respect to the bottom surface. The buoyancy body (8) is formed at a 4-degree angle, with the maximum width (L) of the forward-sloping section (31) and the maximum width (Q) of the rear-sloping section (32) both being 12 m. Furthermore, the sides of the buoyancy body (8) are guided by a radius of 30 cm to hold six mooring wires (A) (11), mooring wires (B) (12), mooring wires (C) (13), mooring wires (D) (14), mooring wires (E) (15), and mooring wires (F) (16) in fixed positions on the sides of the buoyancy body (8). The buoyancy body (8) has six mooring wire guide holes (A) (25), mooring wire guide holes (B) (26), mooring wire guide holes (C) (27), mooring wire guide holes (D) (28), mooring wire guide holes (E) (29), and mooring wire guide holes (F) (30) formed in a roughly semi-cylindrical shape, which are formed vertically on the side of the buoyancy body (8) that radiate outwards at 60-degree intervals from the center when viewed on the horizontal plane of the upper surface of the buoyancy body (8), To minimize resistance from ocean waves and suppress the swaying of the floating offshore wind power plant (1), the eight support columns (6) connecting the tower section (4) and the buoyancy section (8) are all made of cylindrical steel pipes with a diameter of 2 m, a wall thickness of 30 mm, and a length of 10 m. Eight support columns (A) (45), (B) (46), and (C) are positioned at 45-degree intervals from the center of the upper surface of the buoyancy section (8) on a circumference with a radius of 1050 cm when viewed in the horizontal plane. )(47), support columns (D)(48), support columns (E)(49), support columns (F)(50), support columns (G)(51), support columns (H)(52) are mounted vertically so as to be positioned at the center of the eight support columns (A)(45), support columns (B)(46), support columns (C)(47), support columns (D)(48), support columns (E)(49), support columns (F)(50), support columns (G)(51), support columns (H)(52) are attached to the lower surface of the tower base (39) with support column (6), A vertical shaft compartment (34) is formed in the shape of a cylinder with a diameter of 4 m, extending from approximately the top (33) of the tower section (4) through the bottom (39) of the tower, and down to approximately the bottom of the central part of the buoyancy body section (8), In order to moor the floating offshore wind power plant (1) to the seabed (9) using the TLP type, six seabed foundation piles (A) (17), seabed foundation piles (B) (18), seabed foundation piles (C) (19), seabed foundation piles (D) (20), seabed foundation piles (E) (21), and seabed foundation piles (F) (22) fixed to the seabed (9) Then, six mooring wires (A) (11), mooring wire (B) (12), mooring wire (C) (13), mooring wire (D) (14), mooring wire (E) (15), and mooring wire (F) (16) are attached to each, and a wire winding and releasing machine (60) is used to individually wind and release the six mooring wires (A) (11), mooring wire (B) (12), mooring wire (C) (13), mooring wire (D) (14), mooring wire (E) (15), and mooring wire (F) (16) so that the position of the sea surface (7) is approximately in the vertical center of the support column (6). A floating offshore wind power plant (1) is configured to minimize vertical and horizontal swaying relative to the sea surface (7) and maintain a horizontal state, by evenly distributing the buoyancy bodies (8) on the circumference near the side of the vertical shaft compartment (34) inside the first floor (38) of the building, and by pulling one end of the mooring wire, which passes through guide holes for mooring wires formed on the side of the buoyancy body (8), into the building of the tower section (4) via a wire pulley, and by adjusting the length of each mooring wire to forcibly submerge the buoyancy body (8) so that it remains horizontal to the sea surface (7).

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