Construction system and construction method

Abstract

To provide a construction system and construction method that can improve work efficiency when installing blades. [Solution] The construction system is for constructing a wind turbine having blades, a hub, a nacelle, and a tower, and comprises a wire, a winch capable of lifting the blades by the wire, and a first pulley around which the wire is wound, wherein the first pulley is located outside the nacelle and on the opposite side of the tower from the blades.

Description

Technical Field

[0001] The present disclosure relates to a construction system and a construction method.

Background Art

[0002] Conventionally, it is known to construct a wind turbine using a self-elevating platform (SEP ship). Further, Patent Document 1 discloses a repair device and a repair method for performing repair work on a wind turbine. In Patent Document 1, when performing repair work on a blade (wing) of a wind turbine, a wire, a pulley attached to a tower and around which the wire is wound, and a winch to which the end of the wire is wound are used to lift and lower the blade.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique described in Patent Document 1, since the pulley is outside the nacelle and is arranged on the same side of the tower as the blade, the winch tends to get in the way when constructing the blade. Further, since the tension of the winch acts on one side of the tower, there is a concern that the load balance of the tower becomes uneven, which may affect the construction stability of the blade. In the technique described in Patent Document 1, there is room for improvement in improving the work efficiency when constructing the blade.

[0005] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a construction system and a construction method capable of improving the work efficiency when constructing a blade.

Means for Solving the Problems

[0006] A construction system according to one aspect of the present disclosure is a construction system for constructing a wind turbine having blades, a hub, a nacelle, and a tower, comprising a wire, a winch capable of lifting the blades by the wire, and a first pulley around which the wire is wound, wherein the first pulley is located outside the nacelle and on the side of the tower away from the blades.

[0007] A construction method according to one aspect of the present disclosure is a construction method for constructing a wind turbine having blades, a hub, a nacelle, and a tower, comprising: a winch installation step of installing a winch capable of lifting the blades by wire; and a first pulley installation step of installing a first pulley around which the wire is wound, wherein the first pulley installation step places the first pulley outside the nacelle and on the side of the tower away from the blades. [Effects of the Invention]

[0008] According to one aspect of this disclosure, it is possible to provide a construction system and a construction method that can improve the work efficiency when installing blades. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of the wind turbine that is the subject of construction in this disclosure. [Figure 2] This is a schematic diagram of the construction system according to the first embodiment. [Figure 3] This is a plan view of the jig according to the first embodiment. [Figure 4] (a) A plan view and (b) A side view of the first pulley, the second pulley, and the pulley mounting member according to the first embodiment. [Figure 5] This diagram illustrates the installation method for a pulley mounting member according to the first embodiment. [Figure 6] This is a diagram illustrating the construction method according to the first embodiment. [Figure 7]This diagram illustrates the construction method according to the second embodiment. [Figure 8] This is a perspective view of a wind turbine, another example of a construction target in this disclosure. [Figure 9] This is a perspective view of a wind turbine, another example of a construction target in this disclosure. [Modes for carrying out the invention]

[0010] <First Embodiment> The construction system 1 and construction method according to the first embodiment of this disclosure will be described below with reference to the drawings. The construction system 1 and construction method are used to construct a wind turbine 100 for offshore wind power generation.

[0011] Figure 1 is a perspective view of the wind turbine 100. The wind turbine 100 is located offshore. As shown in Figure 1, the wind turbine 100 has a plurality of blades 101, a hub 102, a nacelle 103, and a tower 104. The plurality of blades 101 are attached to the hub 102. When the plurality of blades 101 receive wind, they rotate around the hub 102. The nacelle 103 is located at the top of the tower 104. A generator (not shown) is located inside the nacelle 103. The wind turbine 100 generates electricity by transmitting the rotation of the blades 101 to the generator. The electricity generated by the wind turbine 100 is transmitted, for example, to a power plant on land.

[0012] The wind turbine 100 is supported by a substructure 200. In the illustrated example, the substructure 200 is a monopile M, which is a fixed-bottom foundation. The monopile M is driven into the seabed. The tower 104 and the monopile M are connected by a transition piece T.

[0013] Figure 2 is a schematic diagram of the construction system 1. As shown in Figure 2, the construction system 1 includes a blade wire 11 (wire), a blade winch 12 (winch), a first pulley 13, a second pulley 14, and a jig 15. The end of the blade wire 11 is fixed to one end of the blade 101 via the jig 15. The blade wire 11 is wound around the second pulley 14 and the first pulley 13 and then wound onto the blade winch 12.

[0014] In the following description, the direction along the rotation axis of the hub 102 is referred to as the first direction X. In plan view, the direction orthogonal to the first direction X is referred to as the second direction Y. The vertical direction is referred to as the third direction Z. The first direction X, the second direction Y, and the third direction Z are orthogonal to each other.

[0015] The construction system 1 is used, for example, for the new installation of the blade 101 of the wind turbine 100 and the replacement of the blade 101. When newly installing the blade 101, the construction system 1 winds up the blade wire 11 by the blade winch 12 to lift the blade 101 by the blade wire 11 and attach it to the hub 102. When replacing the blade 101, the construction system 1 pays out the blade wire 11 by the blade winch 12 to remove the blade 101 to be replaced from the hub 102 while suspending it via the blade wire 11. Thereafter, a new blade 101 is lifted by the blade wire 11 and attached to the hub 102.

[0016] Further, the construction system 1 has a crane 21 and a pontoon 22. The crane 21 is used to suspend the blade 一 end of the blade 101 is lifted by the blade wire 11 and the other end is lifted using the crane 21.

[0017] The barge 22 carries the crane 21 and the blade 101 before construction. The blade 101 is transported to the construction site by the barge 22. Note that another ship different from the barge 22 may be used to directly deliver the blade 101 to the construction site. Also, when replacing the blade 101, the blade 101 removed from the hub 102 may be placed on the barge 22.

[0018] The first pulley 13 and the second pulley 14 are arranged outside the nacelle 103. The first pulley 13 and the second pulley 14 are arranged above the blade winch 12. The first pulley 13 and the second pulley 14 are arranged at the same height. The first pulley 13 and the second pulley 14 are fixed to the tower 104. When viewed from the second direction Y, the first pulley 13 and the second pulley 14 are arranged side by side in the first direction X with the tower 104 interposed therebetween.

[0019] The blade winch 12 is arranged on the opposite side of the blade 101 with respect to the tower 104. The blade winch 12 is arranged in the air. The first pulley 13 is also arranged on the opposite side of the blade 101 with respect to the tower 104 (that is, the same side as the blade winch 12). The second pulley 14 is arranged on the opposite side of the first pulley 13 with respect to the tower 104 (that is, the same side as the blade 101). The crane 21 and the barge 22 are arranged on the opposite side of the first pulley 13 with respect to the tower 104 (that is, the same side as the blade 101). The crane 21 and the barge 22 are arranged at a position farther from the tower 104 in the second direction Y than the second pulley 14.

[0020] Furthermore, the construction system 1 includes a pair of first pulleys 13, a pair of second pulleys 14, a pair of blade winches 12, and a pair of blade wires 11. One of the first pulleys 13, one of the second pulleys 14, one of the blade winches 12, and one of the blade wires 11, the other first pulley 13, the other second pulley 14, the other blade winch 12, and the other blade wire in the second direction Y are arranged on one side relative to the tower 104 and the other side relative to the tower 104.

[0021] The jig 15 is attached to one end of the blade 101. The jig 15 can be divided into multiple parts that sandwich the blade 101. For example, as shown in Figure 3, the jig 15 has a split structure composed of a pair of split tubes 16. The inner circumferential surface of the split tube 16 has a shape that conforms to the outer circumferential surface of one end of the blade 101. The blade 101 is held between the pair of split tubes 16.

[0022] Each half-split tube 16 has a connecting portion 16a formed at both ends for connecting a pair of half-split tubes 16 together. When the blade 101 is sandwiched between the pair of half-split tubes 16, the connecting portions 16a of the pair of half-split tubes 16 come into contact with each other. By fastening these connecting portions 16a using fastening members (not shown), the jig 15 (pair of half-split tubes 16) is fixed to one end of the blade 101. The jig 15 also has a pair of lifting points P1 to which a pair of blade wires 11 are attached. The pair of lifting points P1 are formed on each of the pair of half-split tubes 16.

[0023] Returning to Figure 2, the construction system 1 has a winch mounting member 31 (second mounting member) to which the blade winch 12 is attached. The winch mounting member 31 is attached to the transition piece T. The winch mounting member 31 is, for example, an external work platform. The blade winch 12 is fixed to the transition piece T via the winch mounting member 31. This allows the reaction force from the operation of the blade winch 12 to be received by the transition piece T. The winch mounting member 31 may also be attached to the tower 104. In this case, the reaction force from the operation of the blade winch 12 can be received by the tower 104. Alternatively, the winch mounting member 31 may not be provided, and the blade winch 12 may be directly attached to the transition piece T or the tower 104.

[0024] The construction system 1 has a pulley mounting member 32 (first mounting member) to which the first pulley 13 and the second pulley 14 are attached. The pulley mounting member 32 is attached to the tower 104. The first pulley 13 and the second pulley 14 are fixed to the tower 104 via the pulley mounting member 32.

[0025] As shown in Figure 4, the pulley mounting member 32 has a cylindrical main body 33 and a pair of mounting parts 34. The main body 33 is provided so as to surround the outer circumference of the tower 104. The main body 33 is fixed to the tower 104, for example, by bolt connections. The pair of mounting parts 34 are fixed to the main body 33. The pair of mounting parts 34 are positioned on one side of the tower 104 and on the other side of the tower 104 in the second direction Y. A first pulley 13 and a second pulley 14 are rotatably mounted on each mounting part 34 around a rotation axis extending in the second direction Y.

[0026] The construction system 1 has a metal wire 35 and a metal winch 36 for lifting the pulley mounting member 32 to a predetermined position. The metal wire 35 is wound onto the metal winch 36. The metal winch 36 is installed inside the nacelle 103. The end of the metal wire 35 is pulled out from the metal winch 36 and attached to the pulley mounting member 32. As shown in Figure 4(a), the main body 33 of the pulley mounting member 32 has a lifting point P2 to which the metal wire 35 is attached. By winding the metal wire 35 with the metal winch 36, the pulley mounting member 32 can be lifted by the metal wire 35. In this embodiment, four metal wires 35 and four metal winches 36 are provided. However, the number of metal wires 35 and metal winches 36 is not limited to this.

[0027] Next, with reference to Figures 5 and 6, a construction method for constructing the wind turbine 100 will be described. In this embodiment, a construction method for newly constructing the wind turbine 100 will be described. Although a detailed explanation will be omitted, when newly constructing the wind turbine 100, the tower 104, nacelle 103, and hub 102 of the wind turbine 100 are first constructed. The construction of the tower 104, nacelle 103, and hub 102 may be carried out using a SEP vessel. After that, the following steps are performed.

[0028] The construction method of this embodiment comprises a winch installation step, a pulley installation step (first pulley installation step, second pulley installation step), a jig installation step, a blade installation step, a jig removal step, a pulley removal step (first pulley removal step, second pulley removal step), and a winch removal step.

[0029] In the winch installation process, the blade winch 12 is installed. Specifically, the winch mounting member 31 is attached to the transition piece T. Then, the blade winch 12 is attached to the winch mounting member 31. At this time, the blade wire 11 is pre-wound onto the blade winch 12.

[0030] In the pulley installation process, the first pulley 13 and the second pulley 14 are installed. Specifically, first, the first pulley 13 and the second pulley 14 are attached to the pulley mounting member 32. This work may be performed on the winch mounting member 31. Note that the first pulley 13 and the second pulley 14 may be pre-attached to the pulley mounting member 32. As shown in Figure 5(a), the end of the metal wire 35 is pulled out from the metal winch 36 and attached to the pulley mounting member 32. As shown in Figure 5(b), the end of the blade wire 11 is pulled out from the blade winch 12, wrapped around the first pulley 13 and the second pulley 14, and then fixed to the winch mounting member 31 or the transition piece T. Then, while the blade wire 11 is fed out by the blade winch 12, the metal wire 35 is wound up by the metal winch 36, thereby lifting the pulley mounting member 32 by the metal wire 35. At this time, the nacelle 103 receives a reaction force from the operation of the metalwork winch 36. As shown in Figure 5(c), once the pulley mounting member 32 is lifted to a predetermined position, the pulley mounting member 32 is fixed to the tower 104 with bolts or the like. This fixing work can be performed by a worker, for example, using rope work with a rope suspended from the nacelle 103. The pulley mounting member 32 (first pulley 13 and second pulley 14) is positioned at the top of the tower 104. As a result of the above process, the first pulley 13 is located outside the nacelle 103 and on the opposite side of the tower 104 from the blade 101. The second pulley 14 is located outside the nacelle 103 and on the opposite side of the tower 104 from the first pulley 13 (i.e., on the blade 101 side).

[0031] In the jig attachment process, a jig 15 to which the end of the blade wire 11 is attached is attached to the blade 101. Specifically, as shown in Figure 6(a), the end of the blade wire 11, which was fixed to the winch attachment member 31 or the transition piece T, is attached to the jig 15. The jig 15 is then attached to the blade 101 which is placed on the barge 22.

[0032] In the blade mounting process, the blade 101 is attached to the hub 102 while being lifted by the blade winch 12 via the blade wire 11. Specifically, as shown in Figures 6(a) and 6(b), the blade winch 12 winds up the blade wire 11, lifting one end of the blade 101 by the blade wire 11. At this time, the other end of the blade 101 is also lifted using the crane 21. As shown in Figure 6(c), once the blade 101 has been lifted to a predetermined position, the blade 101 is attached to the hub 102.

[0033] Subsequently, in the jig removal process, the jig 15 is removed from the blade 101. This removal can be performed by a worker, for example, using rope work with a rope suspended from the nacelle 103. In the pulley removal process, the first pulley 13 and the second pulley 14 are removed. In the pulley removal process, the first pulley 13 and the second pulley 14 may also be removed together with the pulley mounting member 32 by lowering the pulley mounting member 32 using the metal wire 35 and the metal winch 36. In the winch removal process, the blade winch 12 is removed.

[0034] As described above, the construction system 1 according to this embodiment comprises a blade wire 11 (wire), a blade winch 12 (winch) capable of lifting the blade 101 by the blade wire 11, and a first pulley 13 around which the blade wire 11 is wound. The first pulley 13 is located outside the nacelle 103 and is positioned on the opposite side of the tower 104 from the blade 101.

[0035] Furthermore, the construction method according to this embodiment includes a winch installation step of installing a blade winch 12 capable of lifting the blade 101 by the blade wire 11, and a first pulley installation step of installing a first pulley 13 around which the blade wire 11 is wound. In the first pulley installation step, the first pulley 13 is positioned outside the nacelle 103 and on the opposite side of the tower 104 from the blade 101.

[0036] According to the construction system 1 and construction method of this embodiment, the first pulley 13 is located outside the nacelle 103 and on the opposite side of the tower 104 from the blade 101. Therefore, the blade winch 12 can be positioned in a location that does not interfere with the construction of the blade 101, thereby improving the work efficiency when constructing the blade 101. Furthermore, compared to the case where the pulley is located outside the nacelle and on the same side as the blade relative to the tower, the uneven load balance of the tower 104 is suppressed, and the construction stability of the blade 101 can be improved. Furthermore, according to the construction system 1 and construction method of this embodiment, the blades 101 can be constructed without using a SEP vessel. Therefore, the period of time that an SEP vessel is used in the construction of the wind turbine 100 can be reduced.

[0037] Furthermore, the first pulley 13 is positioned on the same side as the blade winch 12 relative to the tower 104. According to the above configuration, the blade 101 can be easily lifted by the blade wire 11, thereby improving work efficiency when installing the blade 101.

[0038] Furthermore, the construction system 1 includes a second pulley 14 around which the blade wire 11 is wound. The second pulley 14 is positioned on the opposite side of the tower 104 from the first pulley 13. According to the above configuration, the blade 101 can be easily lifted by the blade wire 11, thereby improving work efficiency when installing the blade 101.

[0039] Furthermore, the construction system 1 includes a pulley mounting member 32 (first mounting member) to which the first pulley 13 and the second pulley 14 are attached. The pulley mounting member 32 is attached to the tower 104. According to the above configuration, the first pulley 13 and the second pulley 14 can be easily fixed to the tower 104.

[0040] Furthermore, the construction system 1 includes a crane 21 for suspending the blade 101. According to the above configuration, when lifting the blade 101 with the blade wire 11, the crane 21 is used to lift the blade 101 together, allowing the work to be carried out without damaging the blade 101.

[0041] Furthermore, wind turbine 100 is a wind turbine for offshore wind power generation. The wind turbine 100 is supported by a monopile M, which is a fixed-bottom foundation. According to the above configuration, the blade 101 can be installed even offshore where it is not possible to use cranes for land-based construction.

[0042] Furthermore, the tower 104 and the monopile M, which is a fixed-base foundation, are connected by a transition piece T. The construction system 1 includes a winch mounting member 31 (second mounting member) to which the blade winch 12 is attached. The winch mounting member 31 is attached to the transition piece T. With the above configuration, the blade winch 12 can be fixed to the transition piece T, and the reaction force caused by the operation of the blade winch 12 can be received by the transition piece T.

[0043] Furthermore, the construction system 1 includes a barge 22 on which to place the blade 101. With the above configuration, the blade 101 can be placed on the barge 22 before construction (before lifting). In addition, the blade 101 can be transported to the construction site by the barge 22.

[0044] Furthermore, the construction system 1 includes a pair of first pulleys 13, a pair of second pulleys 14, a pair of blade winches 12, and a pair of blade wires 11. One of the first pulleys 13, one of the second pulleys 14, one of the blade winches 12, and one of the blade wires 11, the other first pulley 13, the other second pulley 14, the other blade winch 12, and the other blade wire are arranged in the second direction Y (the direction perpendicular to the rotation axis of the hub 102 in a plan view) to one side relative to the tower 104 and the other side relative to the tower 104. According to the above configuration, the blade 101 can be stably lifted by a pair of blade wires 11.

[0045] Furthermore, the construction system 1 includes a jig 15 attached to the blade 101 to which the end of the blade wire 11 is attached. With the above configuration, the end of the blade wire 11 can be easily and reliably fixed to the blade 101 via the jig 15.

[0046] Furthermore, the jig 15 can be divided into multiple components by sandwiching the blade 101. With the above configuration, the jig 15 can be easily attached to and removed from the blade 101.

[0047] The installation method also includes a blade attachment step, in which the blade 101 is attached to the hub 102 while being lifted by the blade winch 12 via the blade wire 11. According to the above configuration, the blade 101 can be attached to the hub 102 using the blade winch 12 and the blade wire 11.

[0048] Furthermore, the construction method includes a winch removal step for removing the blade winch 12. According to the above configuration, by removing the blade winch 12 after the blade 101 has been installed, the blade winch 12 can be kept out of the way.

[0049] Furthermore, the construction method includes a first pulley removal step, which involves removing the first pulley 13. With the above configuration, the first pulley 13 can be removed after the blade 101 has been installed, so that the first pulley 13 does not get in the way.

[0050] The construction method also includes a jig attachment step of attaching a jig 15, to which the end of the blade wire 11 is attached, to the blade 101. With the above configuration, the end of the blade wire 11 can be easily and reliably fixed to the blade 101 via the jig 15.

[0051] Furthermore, the construction method includes a jig removal step of removing the jig 15 from the blade 101. With the above configuration, after the blade 101 has been installed, the jig 15 can be removed from the blade 101 so that it does not get in the way.

[0052] <Second Embodiment> Next, a construction method for the second embodiment of the present disclosure will be described. In this embodiment, a construction method for replacing the blade 101 will be described. In this embodiment, the same reference numerals are used for parts that are the same as those in the first embodiment, and their descriptions are omitted; only the differences will be described.

[0053] The construction method of this embodiment comprises a winch installation step, a pulley installation step (first pulley installation step, second pulley installation step), a jig attachment step, a blade removal step, a blade attachment step, a jig removal step, a winch removal step, and a pulley removal step (first pulley removal step, second pulley removal step). Note that the winch installation step and the pulley installation step are the same as in the first embodiment, so their description is omitted here. In the pulley installation step, the end of the blade wire 11 pulled out from the blade winch 12 is fixed to the winch attachment member 31 or the transition piece T.

[0054] In the jig attachment process, a jig 15 to which the end of the blade wire 11 is attached is attached to the blade 101 which is attached to the hub 102. Specifically, as shown in Figure 7(a), the end of the blade wire 11, which was fixed to the winch mounting member 31 or the transition piece T, is attached to the jig 15. This operation is performed on the winch mounting member 31. Then, as shown in Figure 7(b), the jig 15 is lifted by the blade wire 11 by winding up the blade wire 11 with the blade winch 12. When the jig 15 is lifted to a predetermined position, the blade 101 is sandwiched between the pair of split tubes 16 of the jig 15, and the jig 15 is fixed to the blade 101 by fastening the connection portion 16a of the pair of split tubes 16 using a fastening member (not shown).

[0055] In the blade removal process, as shown in Figure 7(c), the blade winch 12 extends the blade wire 11, and the blade 101 is removed from the hub 102 while being suspended via the blade wire 11.

[0056] In the blade mounting process, a new blade 101 is attached to the hub 102 while being lifted by the blade winch 12 via the blade wire 11. The blade mounting process is the same as in the first embodiment, so a description is omitted here.

[0057] Subsequently, in the jig removal process, the jig 15 is removed from the new blade 101. In the pulley removal process, the first pulley 13 and the second pulley 14 are removed. In the winch removal process, the blade winch 12 is removed.

[0058] As described above, the construction method according to this embodiment includes a blade removal step of removing the blade 101 from the hub 102 while suspending it via the blade wire 11 using the blade winch 12. With the above configuration, the blade 101 can be removed from the hub 102 using the blade winch 12 and the blade wire 11.

[0059] It should be noted that this disclosure is not limited to the embodiments described above with reference to the drawings, and various modifications are possible within its technical scope.

[0060] For example, as shown in Figure 8, the substructure 200 may be a jacket structure J, which is a fixed-bottom foundation. The jacket structure J is fixed to the seabed. The tower 104 and the jacket structure J are connected by a transition piece T. The winch mounting member 31 to which the blade winch 12 is attached is attached to the transition piece T.

[0061] As shown in Figure 9, the substructure 200 may be a floating foundation. The floating foundation consists of a floating body F floating on the sea surface, supported by a floating wire W connected to the seabed. In this case, the winch mounting member 31 to which the blade winch 12 is attached is attached to the floating body F.

[0062] Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of this disclosure, and the above-described modifications may be combined as appropriate.

[0063] (Note) The construction system and construction method according to the above embodiment can be understood, for example, as follows. <1> A construction system according to one aspect of the present disclosure is a construction system for constructing a wind turbine having blades, a hub, a nacelle, and a tower, comprising a wire, a winch capable of lifting the blades by the wire, and a first pulley around which the wire is wound, wherein the first pulley is located outside the nacelle and on the side of the tower away from the blades. According to the above configuration, the first pulley is located outside the nacelle and on the opposite side of the tower from the blade. Therefore, the winch can be positioned in a location that does not interfere with the installation of the blade, thereby improving the work efficiency during blade installation.

[0064] <2> the above <1> In the construction system relating to this, the first pulley may be positioned on the same side as the winch relative to the tower. According to the above configuration, the blade can be easily lifted by the wire, improving work efficiency when installing the blade.

[0065] <3> the above <1> or <2> The construction system relating to this includes a second pulley around which the wire is wound, and the second pulley may be positioned on the opposite side of the tower from the first pulley. According to the above configuration, the blade can be easily lifted by the wire, improving work efficiency when installing the blade.

[0066] <4> the above <3> The construction system comprises a first mounting member to which the first pulley and the second pulley are attached, and the first mounting member may be attached to the tower. With the above configuration, the first pulley and the second pulley can be easily fixed to the tower.

[0067] <5> the above <1> from <4> A construction system relating to any one of the above may include a crane for suspending the blade. According to the above configuration, when lifting the blade with a wire, the blade can be lifted simultaneously using a crane, allowing for construction without damaging the blade.

[0068] <6> the above <1> from <5> In any one of the construction systems, the wind turbine may be a wind turbine for offshore wind power generation. According to the above configuration, the blade can be installed even offshore where it is not possible to use cranes for land-based construction.

[0069] <7> the above <6> In the construction system relating to this, the wind turbine may be supported by a fixed-bottom foundation.

[0070] <8> the above <6> In the construction system described herein, the wind turbine may be supported by a floating foundation.

[0071] <9> the above <7> In the construction system relating to this, the tower and the fixed-floor foundation are connected by a transition piece, and the construction system includes a second mounting member to which the winch is attached, and the second mounting member may be attached to the transition piece. With the above configuration, the winch can be fixed to the transition piece, and the reaction force caused by the winch's operation can be received by the transition piece.

[0072] <10> the above <6> from <9> A construction system relating to any one of the above may include a barge on which to mount the blade. With the above configuration, the blade can be placed on the barge before construction (before lifting). Furthermore, the blade can be transported to the construction site by the barge.

[0073] <11> the above <3> The construction system comprises a pair of first pulleys, a pair of second pulleys, a pair of winches, and a pair of wires, wherein one of the first pulleys, one of the second pulleys, one of the winches, and one of the wires, the other first pulley, the other second pulley, the other winch, and the other wire are arranged on one side of the tower and the other side of the tower in a direction perpendicular to the rotation axis of the hub in a plan view. With the above configuration, the blade can be stably lifted by a pair of wires.

[0074] <12> the above <1> from <11> A construction system relating to any one of the above may include a jig attached to the blade to which the end of the wire is attached. With the above configuration, the end of the wire can be easily and securely fixed to the blade via a jig.

[0075] <13> the above <12> In the construction system relating to this, the jig may be divided into multiple members by sandwiching the blade. With the above configuration, the jig can be easily attached to and removed from the blade.

[0076] <14> A construction method according to one aspect of the present disclosure is a construction method for constructing a wind turbine having blades, a hub, a nacelle, and a tower, comprising: a winch installation step of installing a winch capable of lifting the blades by wire; and a first pulley installation step of installing a first pulley around which the wire is wound, wherein the first pulley installation step places the first pulley outside the nacelle and on the side of the tower away from the blades. According to the above configuration, the first pulley is located outside the nacelle and on the opposite side of the tower from the blade. Therefore, the winch can be positioned in a location that does not interfere with the installation of the blade, thereby improving the work efficiency during blade installation.

[0077] <15> the above <14> The construction method relating to this may include a blade attachment step of attaching the blade to the hub while lifting it via the wire using the winch. According to the above configuration, the blade can be attached to the hub using a winch and wire.

[0078] <16> the above <14> The construction method relating to this may include a blade removal step of removing the blade from the hub while suspending it via the wire using the winch. With the above configuration, the blade can be removed from the hub using a winch and wire.

[0079] <17> the above <14> from <16> A construction method relating to any one of the above may include a winch removal step for removing the winch. According to the above configuration, the winch can be removed after the blade has been installed, so that the winch does not get in the way.

[0080] <18> the above <14> from <17> A construction method relating to any one of the above may include a first pulley removal step of removing the first pulley. With the above configuration, the first pulley can be removed after the blade is installed, so that the first pulley does not get in the way.

[0081] <19> the above <14> from <18> A construction method relating to any one of the above may include a jig attachment step of attaching a jig to which the end of the wire is attached to the blade. With the above configuration, the end of the wire can be easily and securely fixed to the blade via a jig.

[0082] <20> the above <19> The construction method relating to this may include a jig removal step of removing the jig from the blade. With the above configuration, after the blade has been installed, the jig can be removed from the blade, so that the jig does not get in the way. [Explanation of Symbols]

[0083] 1. Construction System 11. Braided wire (wire) 12-blade winch (winch) 13 1st pulley 14 Second pulley 15 Jig 21 Cranes 22 Barge 31. Winch mounting component (second mounting component) 32 Pulley mounting member (first mounting member) 100 windmills 101 Blades 102 Hub 103 Nacer 104 Tower J-Jacket structure (fixed-base foundation) M Monopile (fixed foundation) F Floating structure (floating foundation) T Transition Piece

Claims

1. A construction system for constructing a wind turbine having blades, a hub, a nacelle, and a tower, Wire and A winch capable of lifting the blade by the wire, The system comprises a first pulley around which the wire is wound, The construction system wherein the first pulley is located outside the nacelle and on the opposite side of the tower from the blade.

2. The construction system according to claim 1, wherein the first pulley is positioned on the same side as the winch with respect to the tower.

3. The system includes a second pulley around which the wire is wound, The construction system according to claim 1 or 2, wherein the second pulley is positioned on the opposite side of the tower from the first pulley.

4. The first pulley and the second pulley are attached to a first mounting member, The construction system according to claim 3, wherein the first mounting member is attached to the tower.

5. The construction system according to claim 1 or 2, further comprising a crane for suspending the blade.

6. The construction system according to claim 1 or 2, wherein the wind turbine is a wind turbine for offshore wind power generation.

7. The construction system according to claim 6, wherein the wind turbine is supported by a fixed-bottom foundation.

8. The construction system according to claim 6, wherein the wind turbine is supported by a floating foundation.

9. The tower and the fixed-bottom foundation are connected by a transition piece. The construction system includes a second mounting member to which the winch is attached, The installation system according to claim 7, wherein the second mounting member is attached to the transition piece.

10. The construction system according to claim 6, further comprising a barge on which the blade is mounted.

11. A pair of the first pulleys, A pair of the aforementioned second pulleys, A pair of the aforementioned winches, A pair of the aforementioned wires and, The construction system according to claim 3, wherein one of the pair of first pulleys, one of the pair of second pulleys, one of the pair of winches, and one of the pair of wires, and the other of the pair of first pulleys, the other of the pair of second pulleys, the other of the pair of winches, and the other of the pair of wires are arranged in a direction perpendicular to the rotation axis of the hub in a plan view, with the distribution being on one side of the tower and the other side of the tower.

12. The construction system according to claim 1 or 2, comprising a jig attached to the blade to which the end of the wire is attached.

13. The construction system according to claim 12, wherein the jig can be divided into a plurality of members by sandwiching the blade.

14. A construction method for constructing a wind turbine having blades, a hub, a nacelle, and a tower, A winch installation step involves installing a winch capable of lifting the blade by a wire, The process includes a first pulley installation step of installing a first pulley around which the wire is wound, The first pulley installation step is a construction method in which the first pulley is positioned outside the nacelle and on the opposite side of the tower from the blade.

15. The construction method according to claim 14, further comprising a blade attachment step of attaching the blade to the hub while lifting it via the wire using the winch.

16. The construction method according to claim 14, further comprising a blade removal step of removing the blade from the hub while suspending it via the wire by the winch.

17. The construction method according to claim 14, further comprising a winch removal step for removing the aforementioned winch.

18. The construction method according to claim 14, further comprising a first pulley removal step of removing the first pulley.

19. The construction method according to claim 14, further comprising a jig attachment step of attaching a jig to which the end of the wire is attached to the blade.

20. The construction method according to claim 19, further comprising a jig removal step of removing the jig from the blade.

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