Method for constructing wind power generation facility

Abstract

To propose a method for constructing a wind power generation facility, capable of adjusting buoyancy of a floating type foundation to enable efficient construction.SOLUTION: The present invention relates to a method for constructing a wind power generation facility comprising an upper structure 2 with a wind turbine 21 and a support column 22, and a floating foundation 3 supporting the upper structure 2. The method includes a floater installation step for installing a temporary floater 4 on the floating foundation 3 fabricated in a fabrication yard on land, a moving step for moving the floating foundation 3 to a predetermined position by a barge, a launching step for submerging the barge to launch the floating foundation 3, a wind turbine installation step for installing the upper structure 2 of the floating foundation, and a floater removal step for removing the temporary floater 4.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a construction method for a wind power generation facility installed on water. [Background technology]

[0002] When a wind turbine or other equipment is installed on a floating foundation of a wind power facility using a crane or other device from a quay in a port, the draft tends to increase due to the weight of the turbine or other equipment. Therefore, when the water depth in the port is shallower than the draft, it is necessary to increase the buoyancy of the floating foundation to suppress the increase in the draft. Patent Document 1 discloses a semi-submersible floating structure having a center column and side columns, in which openings are provided in the side columns for transporting ballast in and out, and the draft of the floating structure is adjusted by transporting ballast in and out of the side columns through these openings. The floating structure in Patent Document 1 had to be large enough to ensure the necessary buoyancy by itself. Therefore, as wind turbines become larger, the floating structure also becomes larger, which may become uneconomical. When constructing a floating structure in a place with limited space, such as inside a port, it is better for the shape of the floating structure to be as small as possible. In addition, when constructing a structure, the most efficient construction cycle is selected depending on the transportation of materials and the placement of heavy machinery. Therefore, in the construction of a floating structure, it may be towed or temporarily placed depending on the stage. When towing or temporarily placing a floating structure, the buoyancy of the floating structure may be adjusted to change the draft of the floating structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-280301 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to propose a construction method for a wind power generation facility that enables efficient construction by adjusting the buoyancy of the floating foundation. [Means for solving the problem]

[0005] The present invention, which is intended to solve the above-mentioned problems, provides a construction method for a wind power generation facility including a superstructure including a wind turbine and a support column, and a floating foundation supporting the superstructure. The construction method of the first wind power generation facility of the present invention includes a floater installation process in which a temporary floater is installed on the floating foundation fabricated at an on-land production yard, a moving process in which the floating foundation is moved to a predetermined position by a barge, a launching process in which the barge is submerged to launch the floating foundation, a wind turbine installation process in which the upper structure of the floating foundation is installed, and a floater removal process in which the temporary floater is removed. According to this construction method for a wind power generation facility, the buoyancy is ensured by the temporary floaters, so the submergence depth of the barge at which the barge and the floating foundation can be separated can be made smaller than when the temporary floaters are not provided. Therefore, the floating foundation can be launched even in places with relatively shallow water. Furthermore, even when the superstructure is installed on the floating foundation in a place with relatively shallow water, the floating foundation can be prevented from sinking to the bottom of the water because the buoyancy is ensured by the temporary floaters.

[0006] In addition, the second construction method for a wind power generation facility includes a floater installation process in which a temporary floater is installed on the floating foundation fabricated at a production yard on land, a moving process in which the floating foundation is moved to a predetermined position using a barge, a launching process in which the barge is submerged to launch the floating foundation, a floater removal process in which the temporary floater is removed, and a wind turbine installation process in which the upper structure of the floating foundation is installed. According to this construction method for a wind power generation facility, the temporary floater ensures buoyancy, so the submergence depth of the barge at which the barge and the floating foundation can be separated can be made smaller than when the temporary floater is not provided. Therefore, the floating foundation can be launched in a location with a relatively shallow water depth. Since the temporary floater is removed after the floating foundation is launched, the removed temporary floater can be reused for another floating foundation. If a second floater installation process is included in which a temporary floater is reinstalled on the floating foundation before the wind turbine installation process, and a second floater removal process is included in which the temporary floater is removed after the wind turbine installation process, then the superstructure can be installed on the floating foundation even in places with relatively shallow water. Also, the temporary floater can be used for the construction of multiple wind power generation facilities.

[0007] Furthermore, the third construction method for a wind power generation facility includes a moving process of moving the floating foundation, which has been manufactured at a production yard on land, to a predetermined position using a barge, a launching process of submerging the barge to launch the floating foundation, a floater installation process of installing a temporary floater for the floating foundation, a wind turbine installation process of installing the upper structure of the floating foundation, and a floater removal process of removing the temporary floater. According to this construction method for a wind power generation facility, the superstructure can be installed on the floating foundation even in places where the water is relatively shallow.

[0008] It is preferable to use a temporary floater that includes a plurality of hollow floater bodies attached to the floating foundation and wires for fastening the floater bodies to the floating foundation. In the floater installation process when using this temporary floater, the wires can be attached to the upper, lower and outer surfaces of a pair of floater bodies that face each other across the floating foundation, thereby fixing them to the floating foundation. According to this construction method for wind power generation facilities, a pair of floater bodies are arranged on either side of the floating structure, thereby increasing buoyancy in a well-balanced manner. In addition, the floater bodies are fixed to the floating structure by winding wire around the pair of floater bodies facing each other on either side of the floating structure, so that a temporary floater can be installed without extensive processing of the floating structure.

[0009] In addition, if the temporary floater comprises a plurality of hollow floater bodies made of bags and wire for fastening the floater bodies to the floating foundation, the floater installation process simply involves arranging the floater bodies along the side of the floating foundation and installing the wire around the floating foundation and the floater bodies, and pressurizing air into the floater bodies, and the floater removal process simply involves evacuating the air from the floater bodies and recovering the floater bodies and the wire. According to this construction method for a wind power generation facility, the temporary floater can be easily attached and detached. Effect of the Invention

[0010] According to the construction method for a wind power generation facility of the present invention, the buoyancy of the floating foundation can be adjusted, thereby enabling the wind power generation facility to be constructed efficiently. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a wind power generation facility according to an embodiment of the present invention. [Diagram 2] 4 is a flowchart showing a construction method for a wind power generation facility according to the first embodiment. [Diagram 3] FIG. [Figure 4] FIG. 2 is a perspective view showing a floating foundation on which a temporary floater is installed. [Diagram 5] FIG. 2 is a cross-sectional view showing a floating foundation with a temporary floater installed. [Figure 6]1A and 1B are cross-sectional views showing the floater installation process, in which (a) shows the temporary floater in place and (b) shows the air being pressed in. [Figure 7] FIG. [Figure 8] FIG. 2 is a cross-sectional view showing the launching process. [Figure 9] FIG. 1A is a plan view showing the wind turbine installation process, and FIG. 1B is a plan view showing the wind turbine installation process according to another embodiment. [Figure 10] 4 is a cross-sectional view showing the floater removal process. FIG. [Figure 11] 10 is a flowchart showing a construction method for a wind power generation facility according to a second embodiment. [Figure 12] FIG. 11 is a plan view showing a wind turbine installation process according to the second embodiment. [Figure 13] 13 is a flowchart showing a construction method for a wind power generation facility according to a third embodiment. [Figure 14] 4A and 4B are cross-sectional views showing the second floater installation process, in which (a) shows the temporary floater in place and (b) shows the air being pressed in. [Figure 15] 13 is a flowchart showing a construction method for a wind power generation facility according to a fourth embodiment. [Figure 16] FIG. 13 is a plan view showing a moving process of the fourth embodiment. [Figure 17] FIG. 13 is a cross-sectional view showing the launching process of the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A construction method for a wind power generation facility will be described below. Fig. 1 shows a wind power generation facility 1 of this embodiment. The wind power generation facility 1 is an offshore wind power generation facility, and includes an upper structure 2 and a floating foundation (floating structure) 3 that supports the upper structure 2. The upper structure 2 has a wind turbine 21 and columns 22 that support the wind turbine 21, and is installed at a position higher than the water surface via the floating foundation (float) 3 moored on the water. The wind turbine 21 includes a nacelle 23 provided on the upper end of a support 22, a rotor 24 provided at the tip of the nacelle 23, and a plurality of blades 25, 25, 25 (three in this embodiment) provided radially around the rotor 24. The rotor 24 (blades 25) is rotatable about a horizontal axis and is supported by the nacelle 23. The nacelle 23 is rotatable about a vertical axis and is supported by the support 22. The support (tower) 22 is erected on a floating foundation 3.

[0013] The floating foundation 3 of this embodiment comprises a center column 31 that supports the support pillars 22 of the wind turbine 21, four side columns 32, 32, ... arranged at intervals around the center column 31, and beams 33, 33, ... that connect the center column 31 to each side column 32. As shown in FIG. 1, the center column 31 has a cylindrical shape and is disposed in the center of the floating foundation 3 . The side columns 32 are cylindrical and are disposed at equal intervals around the center column 31. The side columns 32 are connected to the center column 31 via beams 33. The beam 33 connects the center column 31 and the side column 32. One end of the beam 33 is connected to the center column 31, and the other end of the beam 33 is connected to the side column 32. The beam 33 in this embodiment has a shape of a rectangular column turned sideways.

[0014] First Embodiment Next, a construction method for the wind power generation facility 1 of the first embodiment will be described. The steps of the construction method for the wind power generation facility of the first embodiment are shown in Fig. 2. As shown in Fig. 2, the construction method for the wind power generation facility of this embodiment includes a foundation fabrication process S11, a floater installation process S12, a moving process S13, a launching process S14, a wind turbine installation process S15, and a floater removal process S16. The foundation fabrication process S11 is a process for fabricating the floating foundation 3. Figure 3 shows the fabrication process for the floating foundation 3. As shown in Figure 3, the floating foundation 3 is fabricated at a floating foundation fabrication site A1 provided in a port. The floating foundation 3 (center column 31, side columns 32, and beams 33) is fabricated by connecting segments fabricated in various ways. Note that the fabrication method for the floating foundation 3 is not limited to the method of connecting segments, and it may be fabricated, for example, by cast-in-place concrete.

[0015] In the floater installation process S12, a temporary floater 4 is installed on the floating foundation 3. The temporary floater 4 is installed on the floating foundation 3 to increase the buoyancy of the floating foundation 3. Figures 4 and 5 show the floating foundation 3 on which the temporary floater 4 is installed. As shown in Figures 4 and 5, the temporary floater 4 comprises a plurality of hollow floater bodies 41, 41, ... attached to the floating foundation 3, and a wire 42 for fastening the floater body 41 to the floating foundation 3. In this embodiment, the temporary floater 4 is installed by attaching the wire 42 around a pair of floater bodies 41, 41 facing each other across the beam of the floating foundation 3. The arrangement of the floater body 41 is not limited.

[0016] The floater body 41 of this embodiment is made of a flexible bag. Air is pressurized into the inside of the floater body 41. The floater body 41 has a triangular prism shape with a height dimension equivalent to the height dimension of the beam 33 (the height dimension of the floating foundation 3 at the position where the floater body 41 is attached), and is disposed between adjacent beams 33, 33. The wire 42 is provided around the floating foundation 3 and the floater body 41 attached to the floating foundation 3. That is, the wire 42 is provided so as to surround the beam 33 and the floater body 41. The material constituting the wire 42 is not limited as long as it has flexibility (flexibility) and a predetermined strength, and a wire is used in this embodiment. The wire 42 may be fixed to the floater body 41 or may be independent from the floater body 41. As shown in FIG. 5, the wire 42 in this embodiment includes a first linear member 43 provided around the upper surface, lower surface and outer surface of one floater body 41, a second linear member 44 provided around the upper surface, lower surface and outer surface of the other floater body 41, and a connecting jig 45 interposed between the first linear member 43 and the second linear member 44. The pair of floater bodies 41, 41 are fixed to the floating foundation 3 by connecting the first linear member 43 and the second linear member 44 via connecting jigs 45 on the upper and lower surfaces of the beam 33. Note that the wire 42 does not necessarily have to be divided into the first linear member 43 and the second linear member 44.

[0017] The floater installation step S12 is shown in Fig. 6. In the floater installation step S12, first, as shown in Fig. 6(a), the floater body 41 is arranged along the side of the floating foundation 3, and the wire 42 is arranged around the floating foundation 3 and the floater body 41. Next, as shown in Fig. 6(b), air is injected into the floater body 41. At this time, if the wire 42 and the floater body 41 are fixed together in advance, the wire 42 is arranged around the floating foundation 3, and the floater body 41 is disposed between the wire 42 and the floating foundation 3. On the other hand, if the wire 42 and the floater body 41 are separate, the floater body 41 may be arranged after the wire 42 is arranged around the floating foundation 3, or the floater body 41 may be attached to the floating foundation 3 and then the wire 42 is arranged around the floating foundation 3, and the procedure is not limited. When the wire 42 is arranged around the floater body 41 after the floater body 41 is attached, air may be compressed into the floater body 41 in advance.

[0018] The moving process S13 is a process in which the floating foundation 3 is moved to a predetermined position by a barge B. The moving process is shown in Figure 7. The quay to the side of the manufacturing (assembly) location of the floating foundation 3 faces the sea. The manufactured floating foundation is installed on the sea. The manufactured floating foundation 3 is loaded onto a barge B moored to the quay using a crane or the like, and the barge B is towed to transport it to the predetermined installation position, as shown in Figure 7.

[0019] The launching process S14 is a process in which the floating foundation 3 is unloaded from the barge B and launched. Figure 8 shows the launching process S14. When launching the floating foundation 3, as shown in Figure 8, the barge B, which is a semi-submersible barge, is sunk to separate the floating foundation 3 from the barge B. The buoyancy of the floating foundation 3 is increased by the temporary floater 4, and it is separated before the barge B comes into contact with the water bottom.

[0020] The wind turbine installation step S15 is a step of installing the superstructure 2 on the floating foundation 3. FIG. 9 shows the wind turbine installation step S15. As shown in FIG. 9(a), the installation of the superstructure 2 (wind turbine 21) on the floating foundation 3 is performed by first towing the floating foundation 3 to the wind turbine installation site A2. In this embodiment, the wind turbine installation site A2 is provided on the opposite bank of the floating foundation fabrication site A1. The location of the wind turbine installation site A2 is not limited. Next, a temporary floater 4 is installed on the floating foundation 3. The superstructure 2 (wind turbine 21) is installed on the floating foundation 3 using a crane installed on the ground while the floating foundation 3 is moored. At this time, the buoyancy of the floating foundation 3 is increased by the temporary floater 4, so the draft height is controlled by the weight of the superstructure 2. Then, the wind power generation facility 1 is formed by installing the superstructure 2 on the floating foundation 3. The wind power generation facility 1 is towed to a predetermined position as necessary. Once the wind power generation facility 1 has been towed to a designated location, it is moored and the temporary floater 4 is removed.

[0021] The work of installing the superstructure 2 (wind turbine 21) on the floating foundation 3 does not have to be performed at the wind turbine installation site A2, and may be performed, for example, on the water as shown in FIG. 9(b). When installing the superstructure 2 on the water, the floating foundation 3 is moored and a crane C provided on an SEP vessel or the like is used. The wind power generation facility 1 is formed by installing the superstructure 2 on the floating foundation 3. After the wind power generation facility 1 is completed, it can be towed to a specified location as necessary.

[0022] The floater removal process S16 is a process of removing the temporary floater 4. The floater removal process S16 is shown in Fig. 10. The temporary floater 4 is removed after the wind power generation facility 1 is moored at a predetermined position. When removing the temporary floater 4, first, as shown in Fig. 10, the air is exhausted from the floater body 41. Next, the floater body 41 and the wires 42 are removed from the floating foundation 3 and recovered. Note that the air may be exhausted from the floater body 41 after the temporary floater 4 is removed from the floating foundation 3.

[0023] According to the construction method for a wind power generation facility of this embodiment, since buoyancy is ensured by the temporary floater 4, the submerged depth of the barge B at which the barge B and the floating foundation 3 can be separated can be made smaller than that in the case where the temporary floater 4 is not provided. Therefore, the floating foundation 3 can be launched even in a place where the water depth is relatively shallow. Furthermore, even when the superstructure 2 is installed on the floating foundation 3 in a location with relatively shallow water depth, the temporary floater 4 ensures buoyancy, preventing the floating foundation 3 from sinking to the bottom of the water. By adjusting the amount of air (gas) inside the floater body 41, the buoyancy of the floating foundation 3 can be adjusted, and thus the water draft can be adjusted. The temporary floater 4 is fixed to the floating foundation 3 by winding wire 42 around the floater bodies 41, 41, so it can be easily installed without requiring large-scale processing of the floating foundation 3. Since the floater body 41 is a flexible bag, it can be folded when not in use and does not take up much space during transportation or storage. When removing the temporary floater 4, the air inside the floater body 41 is released to cause it to deflate, allowing it to be easily removed (see FIG. 10).

[0024] Second Embodiment A construction method for a wind power generation facility 1 according to a second embodiment is shown in Fig. 11. The construction method for a wind power generation facility according to the second embodiment includes a foundation fabrication process S21, a floater installation process S22, a moving process S23, a launching process S24, a floater removal process S25, and a wind turbine installation process S26, as shown in Fig. 11. The details of the foundation fabrication process S21 to the launching process S24 of this embodiment are similar to those of the foundation fabrication process 11 to the launching process 14 of the first embodiment, and therefore detailed explanations will be omitted. In addition, the details of the temporary floater 4 of this embodiment are similar to those of the temporary floater 4 of the first embodiment, and therefore detailed explanations will be omitted.

[0025] The floater removal process S25 is a process of removing the temporary floater 4 from the floating foundation 3. The temporary floater 4 is removed after mooring the wind power generation facility 1 at a predetermined position. When removing the temporary floater 4, the first step is to exhaust air from the floater body 41 (see FIG. 10). Next, the floater body 41 and wires 42 are removed from the floating foundation 3 and recovered. Note that exhausting air from the floater body 41 may be performed after the temporary floater 4 is removed from the floating foundation 3.

[0026] The wind turbine installation step S26 is a step of installing the superstructure 2 on the floating foundation 3. FIG. 12 shows the wind turbine installation step S26. The work of installing the superstructure 2 (wind turbine 21) on the floating foundation 3 is performed by using a crane C provided on a SEP ship or the like while the floating foundation 3 is moored, as shown in FIG. 12(a). As shown in FIG. 12(b), the floating foundation 3 is placed at a position with a water depth that does not contact the bottom of the water even if the draft of the floating foundation 3 increases due to the installation of the superstructure 2. Note that, prior to the installation of the superstructure 2, the floating foundation 3 may be towed to a predetermined position as necessary. The wind power generation facility 1 is formed by installing the superstructure 2 on the floating foundation 3. After the wind power generation facility 1 is completed, the wind power generation facility is moored at a predetermined position. Note that the wind power generation facility 1 may be towed to a predetermined position and then moored.

[0027] According to the construction method of the wind power generation facility of the second embodiment, since buoyancy is ensured by the temporary floater, the submerged depth of the barge at which the barge and the floating foundation are separated can be made smaller than when the temporary floater is not provided. Therefore, the floating foundation can be launched even in a place with a relatively shallow water depth. Furthermore, by removing the temporary floater after the floating foundation is launched, the temporary floater can be repurposed for another floating foundation.

[0028] <Third embodiment> A construction method for a wind power generation facility 1 according to a third embodiment is shown. Fig. 13 shows the steps of the construction method for a wind power generation facility according to the third embodiment. As shown in Fig. 13, the construction method for a wind power generation facility according to this embodiment includes a foundation fabrication process S31, a first floater installation process S32, a moving process S33, a launching process S34, a first floater removal process S35, a second floater installation process S36, a wind turbine installation process S37, and a second floater removal process S38. The details of the foundation fabrication process S31, the first floater installation process S32, the moving process S33, the launching process S34 and the first floater removal process S35 of this embodiment are similar to those of the foundation fabrication process S21, the floater installation process S22, the moving process S23, the launching process S24 and the floater removal process S25 of the second embodiment, and therefore detailed explanations will be omitted. The details of the temporary floater 4 of this embodiment are also similar to those of the temporary floater 4 of the first embodiment, and therefore detailed explanations will be omitted. In this embodiment, after the temporary floater 4 is removed, the floating foundation 3 is temporarily placed. The removed temporary floater 4 is repurposed for another floating foundation 3 as necessary.

[0029] The second floater installation process S36 is a process of installing the temporary floater 4 on the floating foundation 3 again before installing the superstructure 2 on the floating foundation 3. FIG. 14 shows the second floater installation process S36. The temporary floater 4 may be installed after the floating foundation 3 is towed to the position where the superstructure 2 is to be installed, or may be installed before towing. When installing the temporary floater 4 on the floating foundation 3, first, as shown in FIG. 14(a), the floater body 41 is arranged along the side of the floating foundation 3, and the wire 42 is installed around the floating foundation 3 and the floater body 41. At this time, the installation work of the temporary floater 4 is performed by a diver or the like underwater while being supported by a crane or the like provided on the SEP ship or the like. Next, as shown in FIG. 14(b), the temporary floater 4 is installed on the floating foundation 3 by injecting air compressed from a compressor or the like into the floater body 41.

[0030] The wind turbine installation process S37 is a process of installing the superstructure 2 on the floating foundation 3. The work of installing the superstructure 2 (wind turbine 21) on the floating foundation 3 is performed using a crane installed on the ground or a crane installed on an SEP vessel or the like while the floating foundation 3 is moored. Note that prior to installation of the superstructure 2, the floating foundation 3 may be towed to a predetermined position. Since the buoyancy of the floating foundation 3 is increased by the temporary floater 4, the draft height is controlled by the weight of the superstructure 2. When the superstructure 2 is installed on the floating foundation 3, the wind power generation facility 1 is formed. After completion of the wind power generation facility 1, it is towed to a predetermined position as necessary.

[0031] The second floater removal process S38 is a process of removing the temporary floater 4. The temporary floater 4 is removed after mooring the wind power generation facility 1 at a predetermined position. When removing the temporary floater 4, first, the air is exhausted from the floater body 41 (see FIG. 10). Next, the floater body 41 and wires 42 are removed from the floating foundation 3 and recovered. Note that exhausting air from the floater body 41 may be performed after the temporary floater 4 is removed from the floating foundation 3.

[0032] According to the construction method for a wind power generation facility of the third embodiment, the buoyancy of the floating foundation 3 is ensured by the temporary floater 4, so the submerged depth of the barge B at which the barge B and the floating foundation 3 are separated can be made smaller than when the temporary floater 4 is not provided. Therefore, the floating foundation 3 can be launched even in places with relatively shallow water. In addition, by removing the temporary floater after the floating foundation is launched, the temporary floater can be repurposed for another floating foundation. Furthermore, even when the superstructure 2 is installed on the floating foundation 3 in a location with relatively shallow water depth, the buoyancy of the floating foundation 3 is ensured by the temporary floater 4, thereby preventing the floating foundation 3 from sinking to the bottom of the water.

[0033] <Fourth embodiment> A construction method for a wind power generation facility 1 according to a fourth embodiment is shown. The steps of the construction method for a wind power generation facility according to the fourth embodiment are shown in Fig. 15. As shown in Fig. 15, the construction method for a wind power generation facility according to this embodiment includes a foundation fabrication process S41, a moving process S42, a launching process S43, a floater installation process S44, a wind turbine installation process S45, and a floater removal process S46. The details of the basic construction process S41, the floater installation process S44, the wind turbine installation process S45 and the floater removal process S46 in this embodiment are similar to those of the basic construction process S31, the second floater installation process S36, the wind turbine installation process S37 and the second floater removal process S38 in the third embodiment, so detailed explanations will be omitted. The moving step S42 is a step of moving the floating foundation 3 to a predetermined position by the barge B. The moving step S42 is shown in Fig. 16. The floating foundation 3 is loaded onto the barge B moored to a quay using a crane or the like, and then the barge B is towed to transport it to a predetermined installation position, as shown in Fig. 16.

[0034] The launching process S43 is a process of unloading the floating foundation 3 from the barge B and launching it. The launching process S43 is shown in Fig. 17. When launching the floating foundation 3, as shown in Fig. 17, the barge B, which is a semi-submersible barge, is sunk, and the submerged barge B and the floating foundation 3 are separated, and the floating foundation 3 is launched.

[0035] According to the construction method for a wind power generation facility of the fourth embodiment, the buoyancy of the floating foundation 3 is ensured by the temporary floater 4, so that the superstructure can be installed on the floating foundation even in places where the water is relatively shallow.

[0036] Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and each of the above-described components can be appropriately modified without departing from the spirit of the present invention. For example, in the embodiment, the floating foundation 3 is of a semi-submersible type, but the structure of the floating foundation 3 is not limited thereto, and it may be of a barge type, for example. The material constituting the floating foundation 3 is not limited, and may be made of, for example, steel or concrete. Furthermore, the number of side columns 32 constituting the floating foundation 3 is not limited, and may be, for example, three. Furthermore, the support columns 22 of the wind turbine 21 may be erected on the side columns 32. Moreover, the shape of the beam 33 is not limited to a prismatic shape.

[0037] The material constituting the wire 42 is not limited to wire, and may be, for example, rope, carbon fiber, or a band-shaped (belt-shaped) member. Also, a material such as steel may be used as the wire 42, and the floater body 41 may be fixed by combining the wires 42 into a frame shape. The shape and dimensions of the floater body 41 are not limited and may be determined appropriately. The material constituting the floater body 41 is not limited and may be, for example, made of resin or a coated cloth to ensure airtightness. Furthermore, the bag constituting the floater body 41 may have a double structure to ensure the necessary strength. A rigid box may be used as the floater body 41. Furthermore, the floater body 41 may be formed by combining a rigid member (e.g., a plate material) partially (upper surface, lower surface, or side surface) with a flexible or flexible member. The floater body 41 may be divided into an interior space for sealing air and an interior space for sealing water, and the buoyancy may be adjusted by the amount of water sealed inside. In addition, the buoyancy may be adjusted by the amount of air inside the floater body 41. [Explanation of symbols]

[0038] 1. Wind power generation facilities 2 Superstructure 21 Windmill 22 Posts 3. Floating Foundations 31 Center Column 32 Side Column 33 Beam 4 Temporary Floaters 41 Floater body 42 Wire rod 43 First line member 44 Second linear member 45 Connection jig

Claims

1. A construction method for a wind power generation facility including a superstructure including a wind turbine and a support column, and a floating foundation supporting the superstructure, comprising: a floater installation process in which a temporary floater is installed on the floating foundation fabricated in a fabrication yard on land; a moving step of moving the floating foundation to a predetermined position by a barge; a launching step of submerging the barge to launch the floating foundation; a wind turbine installation process in which the upper structure of the floating foundation is installed; A construction method for a wind power generation facility, comprising a floater removal process for removing the temporary floater.

2. A construction method for a wind power generation facility including a superstructure including a wind turbine and a support column, and a floating foundation supporting the superstructure, comprising: a floater installation process in which a temporary floater is installed on the floating foundation fabricated in a fabrication yard on land; a moving step of moving the floating foundation to a predetermined position by a barge; a launching step of submerging the barge to launch the floating foundation; a floater removal process for removing the temporary floater; and a wind turbine installation step of installing an upper structure of the floating foundation.

3. A second floater installation step of reinstalling a temporary floater on the floating foundation is provided before the wind turbine installation step, 3. The construction method for a wind power facility according to claim 2, further comprising a second floater removal step of removing the temporary floater after the wind turbine installation step.

4. A construction method for a wind power generation facility including a superstructure including a wind turbine and a support column, and a floating foundation supporting the superstructure, comprising: a moving step of moving the floating foundation fabricated in a land-based fabrication yard to a predetermined position by a barge; a launching step of submerging the barge to launch the floating foundation; a floater installation process for installing a temporary floater of the floating foundation; a wind turbine installation process in which the upper structure of the floating foundation is installed; A construction method for a wind power generation facility, comprising a floater removal process for removing the temporary floater.

5. The temporary floater comprises a plurality of hollow floater bodies attached to the floating foundation, and wires for fastening the floater bodies to the floating foundation, A construction method for a wind power generation facility as described in any one of claims 1 to 4, characterized in that in the floater installation process, the floating foundation is fixed by installing the wire around the upper, lower and outer surfaces of a pair of floater bodies facing each other across the floating foundation.

6. The temporary floater includes a plurality of hollow floater bodies each formed of a bag body, and a wire for fastening the floater bodies to the floating foundation, In the floater installation process, An operation of disposing the floater body along a side surface of the floating foundation and installing the wire around the floating foundation and the floater body; 5. The construction method for a wind power generation facility according to claim 1, further comprising the step of: pressurizing air into the floater body.

7. In the floater removal process, An operation of discharging air from the floater body; The construction method for a wind power generation facility according to claim 6, further comprising the step of recovering the floater body and the wire.

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