Construction system and construction method

Abstract

To provide a construction system and a construction method capable of improving the working efficiency when constructing a blade. 【Solution means】The construction system is a construction system for constructing a wind turbine having a blade, a hub, a nacelle, and a tower, and includes a wire, a winch capable of lifting the blade by the wire, and a first pulley around which the wire is wound. The first pulley is outside the nacelle and is disposed on the side opposite to the blade with respect to the tower.

Description

Technical Field

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

Background Art

[0002] Conventionally, it has been known to construct wind turbines using a SEP ship (Self-Elevating Platform). 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 around which the wire is wound, and a winch to which an 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, affecting the construction stability of the blade. There was room for improvement in improving the working efficiency when constructing the blade in the technique described in Patent Document 1.

[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 working efficiency when constructing a blade.

Means for Solving the Problems

[0006] A construction system according to an aspect of the present disclosure is a construction system for constructing a wind turbine having a blade, a hub, a nacelle, and a tower, comprising a wire, a winch capable of lifting the blade by the wire, and a first pulley around which the wire is wound. The first pulley is located outside the nacelle and on the side opposite to the blade with respect to the tower.

[0007] A construction method according to an aspect of the present disclosure is a construction method for constructing a wind turbine having a blade, a hub, a nacelle, and a tower, comprising a winch installation step of installing a winch capable of lifting the blade by a wire, and a first pulley installation step of installing a first pulley around which the wire is wound. In the first pulley installation step, the first pulley is arranged outside the nacelle and on the side opposite to the blade with respect to the tower.

Advantages of the Invention

[0008] According to an aspect of the present disclosure, it is possible to provide a construction system and a construction method that can improve the working efficiency when constructing a blade.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

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

[0011] FIG. 1 is a perspective view of the windmill 100. The windmill 100 is arranged offshore. As shown in FIG. 1, the windmill 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 provided at the upper end of the tower 104. A generator (not shown) is provided inside the nacelle 103. The windmill 100 generates electricity by transmitting the rotation of the blade 101 to the generator. The electricity generated by the windmill 100 is transmitted to, for example, a power plant on the ground.

[0012] The windmill 100 is supported by a lower structure 200. In the illustrated example, the lower structure 200 is a monopile M which is a gravity-based 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. One 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 a 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 installation of the blade 101 of the wind turbine 100 and the replacement of the blade 101. When 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] In addition, the construction system 1 has a crane 21 and a barge 22. The crane 21 is used to lift the blade 101 in tandem. Specifically, one 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 has a crane 21 and a blade 101 before construction placed thereon. The blade 101 is transported to the construction site by the barge 22. Note that a different ship 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 in between.

[0019] The blade winch 12 is arranged on the side of the tower 104 opposite to the blade 101. The blade winch 12 is arranged in the air. The first pulley 13 is also arranged on the side of the tower 104 opposite to the blade 101 (i.e., the same side as the blade winch 12). The second pulley 14 is arranged on the side of the tower 104 opposite to the first pulley 13 (i.e., the same side as the blade 101). The crane 21 and the barge 22 are arranged on the side of the tower 104 opposite to the first pulley 13 (i.e., 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] In addition, 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 pair of first pulleys 13, one of the pair of second pulleys 14, one of the pair of blade winches 12, and one of the pair of blade wires 11, and the other of the pair of first pulleys 13, the other of the pair of second pulleys 14, the other of the pair of blade winches 12, and the other of the pair of blade wires 11 are distributed and arranged on one side and the other side with respect to the tower 104 in the second direction Y.

[0021] The jig 15 is attached to one end of the blade 101. The jig 15 can be divided into a plurality of members with the blade 101 sandwiched therebetween. For example, as shown in FIG. 3, the jig 15 has a split structure formed by a pair of split pipes 16. The inner peripheral surface of the split pipe 16 has a shape along the outer peripheral surface of one end of the blade 101. The blade 101 is clamped by a pair of split pipes 16.

[0022] Connection portions 16a for connecting the pair of split pipes 16 to each other are respectively formed at both ends of the split pipe 16. When the blade 101 is clamped by the pair of split pipes 16, the connection portions 16a of the pair of split pipes 16 come into contact with each other. By fastening these connection portions 16a using a fastening member (not shown), the jig 15 (the pair of split pipes 16) is fixed to one end of the blade 101. In addition, the jig 15 has a pair of lifting points P1 to which the pair of blade wires 11 are respectively attached. The pair of lifting points P1 are respectively formed on the pair of split pipes 16.

[0023] Returning to FIG. 2, the construction system 1 has a winch attachment member 31 (second attachment member) to which the blade winch 12 is attached. The winch attachment member 31 is attached to the transition piece T. The winch attachment member 31 is, for example, an external work floor. The blade winch 12 is fixed to the transition piece T via the winch attachment member 31. Thereby, the reaction force due to the operation of the blade winch 12 can be received by the transition piece T. Note that the winch attachment member 31 may be attached to the tower 104. In this case, the reaction force due to the operation of the blade winch 12 can be received by the tower 104. Further, the winch attachment 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 attachment member 32 (first attachment member) to which the first pulley 13 and the second pulley 14 are attached. The pulley attachment 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 attachment member 32.

[0025] As shown in FIG. 4, the pulley attachment member 32 has a cylindrical main body portion 33 and a pair of attachment portions 34. The main body portion 33 is provided so as to surround the outer periphery of the tower 104. The main body portion 33 is fixed to the tower 104, for example, by bolt connection. The pair of attachment portions 34 are fixed to the main body portion 33. The pair of attachment portions 34 are arranged on one side with respect to the tower 104 and on the other side with respect to the tower 104 in the second direction Y. The first pulley 13 and the second pulley 14 are rotatably attached to each attachment portion 34 about a rotation axis extending in the second direction Y.

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

[0027] Next, with reference to FIGS. 5 and 6, a construction method for constructing the wind turbine 100 will be described. In this embodiment, a construction method for newly installing the wind turbine 100 will be described. Although detailed description is omitted, when newly installing the wind turbine 100, first, the tower 104, the nacelle 103, and the hub 102 of the wind turbine 100 are constructed. The construction of the tower 104, the nacelle 103, and the hub 102 may be performed using an SEP ship. Thereafter, the following steps are performed.

[0028] The construction method of this embodiment includes a winch installation step, a pulley installation step (first pulley installation step, second pulley installation step), a jig attachment step, a blade attachment 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 step, the blade winch 12 is installed. Specifically, the winch attachment member 31 is attached to the transition piece T. Thereafter, the blade winch 12 is attached to the winch attachment member 31. At this time, the blade wire 11 is pre-wound around 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 attachment member 32. This operation may be performed on the winch attachment member 31. Note that the first pulley 13 and the second pulley 14 may be pre-attached to the pulley attachment member 32. As shown in Fig. 5(a), the end of the metalware wire 35 is drawn out from the metalware winch 36 and attached to the pulley attachment member 32. As shown in Fig. 5(b), the end of the blade wire 11 is drawn out from the blade winch 12, wound around the first pulley 13 and the second pulley 14, and then fixed to the winch attachment member 31 or the transition piece T. Then, while the blade winch 12 pays out the blade wire 11, the metalware winch 36 winds up the metalware wire 35 to lift the pulley attachment member 32 by the metalware wire 35. At this time, the nacelle 103 receives the reaction force due to the operation of the metalware winch 36. As shown in Fig. 5(c), when the pulley attachment member 32 is lifted to a predetermined position, the pulley attachment member 32 is fixed to the tower 104 with bolts or the like. This fixing operation can be performed by an operator, for example, by rope work using a rope suspended from the nacelle 103. The pulley attachment member 32 (the first pulley 13 and the second pulley 14) is arranged at the upper part of the tower 104. By the above process, the first pulley 13 is arranged outside the nacelle 103 and on the side opposite to the blade 101 with respect to the tower 104. The second pulley 14 is arranged outside the nacelle 103 and on the side opposite to the first pulley 13 (i.e., the blade 101 side) with respect to the tower 104.

[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 Fig. 6(a), the end of the blade wire 11 fixed to the winch attachment member 31 or the transition piece T is attached to the jig 15. The jig 15 is attached to the blade 101 placed on the barge 22.

[0032] In the blade attachment 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 FIGS. 6(a) and 6(b), by winding the blade wire 11 with the blade winch 12, one end of the blade 101 is lifted 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 FIG. 6(c), when the blade 101 is lifted to a predetermined position, the blade 101 is attached to the hub 102.

[0033] After that, in the jig removal process, the jig 15 is removed from the blade 101. This removal work can be performed by an operator, for example, by rope work using 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 be removed together with the pulley attachment member 32 by suspending the pulley attachment member 32 using the hardware wire 35 and the hardware winch 36. In the winch removal process, the blade winch 12 is removed.

[0034] As described above, the construction system 1 according to the present embodiment includes 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 outside the nacelle 103 and is disposed on the side opposite to the blade 101 with respect to the tower 104.

[0035] Further, the construction method according to the present embodiment includes a winch installation process of installing a blade winch 12 capable of lifting the blade 101 by the blade wire 11, and a first pulley installation process of installing a first pulley 13 around which the blade wire 11 is wound. In the first pulley installation process, the first pulley 13 is disposed outside the nacelle 103 and on the side opposite to the blade 101 with respect to the tower 104.

[0036] According to the construction system 1 and the construction method according to this embodiment, the first pulley 13 is outside the nacelle 103 and is arranged on the side opposite to the blade 101 with respect to the tower 104. Therefore, the blade winch 12 can be arranged at a position where it is less likely to get in the way when constructing the blade 101, and the working efficiency when constructing the blade 101 can be improved. In addition, compared with the case where the pulley is outside the nacelle and is arranged on the same side as the blade with respect to the tower, it is possible to suppress the uneven load balance of the tower 104, and the construction stability of the blade 101 can be improved. According to the construction system 1 and the construction method according to this embodiment, the blade 101 can be constructed without using an SEP ship. Therefore, the usage period of the SEP ship in the construction of the wind turbine 100 can be suppressed.

[0037] In addition, the first pulley 13 is arranged on the same side as the blade winch 12 with respect to the tower 104. According to the above configuration, it becomes easier to lift the blade 101 by the blade wire 11, and the working efficiency when constructing the blade 101 can be improved.

[0038] In addition, the construction system 1 includes a second pulley 14 around which the blade wire 11 is wound. The second pulley 14 is arranged on the side opposite to the first pulley 13 with respect to the tower 104. According to the above configuration, it becomes easier to lift the blade 101 by the blade wire 11, and the working efficiency when constructing the blade 101 can be improved.

[0039] In addition, the construction system 1 includes a pulley attachment member 32 (first attachment member) to which the first pulley 13 and the second pulley 14 are attached. The pulley attachment 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] In addition, the construction system 1 includes a crane 21 for suspending the blade 101. According to the above configuration, when lifting the blade 101 by the blade wire 11, the crane 21 can be used to suspend the blade 101 in a counter-suspension manner, enabling construction without damaging the blade 101.

[0041] Moreover, the wind turbine 100 is an offshore wind power generation wind turbine. The wind turbine 100 is supported by a monopile M which is a fixed-bottom foundation. According to the above configuration, even in an offshore area where a land construction crane cannot be used, the blade 101 can be constructed.

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

[0043] In addition, the construction system 1 includes a barge 22 for placing the blade 101. According to the above configuration, the blade 101 before construction (before lifting) can be placed on the barge 22. Also, the blade 101 can be transported to the construction site by the barge 22.

[0044] In addition, 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 pair of first pulleys 13, one of the pair of second pulleys 14, one of the pair of blade winches 12, and one of the pair of blade wires 11, and the other of the pair of first pulleys 13, the other of the pair of second pulleys 14, the other of the pair of blade winches 12, and the other of the pair of blade wires 11 are distributed and arranged on one side and the other side with respect to the tower 104 in the second direction Y (a direction perpendicular to the rotation axis of the hub 102 in plan view). According to the above configuration, the blade 101 can be stably lifted by the pair of blade wires 11.

[0045] In addition, the construction system 1 includes a jig 15 that is attached to the blade 101 and to which the ends of the blade wires 11 are attached. According to the above configuration, the ends of the blade wires 11 can be easily and reliably fixed to the blade 101 via the jig 15.

[0046] In addition, the jig 15 can be divided into a plurality of members while sandwiching the blade 101. According to the above configuration, the jig 15 can be easily attached to and removed from the blade 101.

[0047] In addition, the construction method includes a blade attachment step of attaching the blade 101 to the hub 102 while lifting the blade 101 via the blade wire 11 by the blade winch 12. 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] In addition, the construction method includes a winch removal step of removing the blade winch 12. According to the above configuration, after the blade 101 is installed, the blade winch 12 can be removed so that the blade winch 12 does not get in the way.

[0049] Moreover, the installation method includes a first pulley removal step of removing the first pulley 13. According to the above configuration, after the blade 101 is installed, the first pulley 13 can be removed so that the first pulley 13 does not get in the way.

[0050] Moreover, the installation method 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. According to the above configuration, the end of the blade wire 11 can be easily and surely fixed to the blade 101 via the jig 15.

[0051] Moreover, the installation method includes a jig removal step of removing the jig 15 from the blade 101. According to the above configuration, after the blade 101 is installed, the jig 15 can be removed from the blade 101 so that the jig 15 does not get in the way.

[0052] <Second Embodiment> Next, an installation method according to the second embodiment of the present disclosure will be described. In this embodiment, an installation method for replacing the blade 101 will be described. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and only the differences will be described.

[0053] The construction method of this embodiment includes a winch installation step, a pulley installation step (a first pulley installation step and a 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 (a first pulley removal step and a second pulley removal step). Since the winch installation step and the pulley installation step are the same as those in the first embodiment, the description thereof is omitted here. By the pulley installation step, the end of the blade wire 11 drawn out from the blade winch 12 is fixed to the winch attachment member 31 or the transition piece T.

[0054] In the jig attachment step, a jig 15 to which the end of the blade wire 11 is attached is attached to the blade 101 attached to the hub 102. Specifically, as shown in Fig. 7(a), the end of the blade wire 11 fixed to the winch attachment member 31 or the transition piece T is attached to the jig 15. This operation is performed on the winch attachment member 31. Then, as shown in Fig. 7(b), the blade wire 11 is wound up by the blade winch 12 to lift the jig 15 by the blade wire 11. When the jig 15 is lifted to a predetermined position, the blade 101 is clamped by the pair of split pipes 16 of the jig 15, and the connection portion 16a of the pair of split pipes 16 is fastened using a fastening member (not shown) to fix the jig 15 to the blade 101.

[0055] In the blade removal step, as shown in Fig. 7(c), the blade wire 11 is paid out by the blade winch 12 to remove the blade 101 from the hub 102 while suspending it via the blade wire 11.

[0056] In the blade attachment step, a new blade 101 is attached to the hub 102 while being lifted via the blade wire 11 by the blade winch 12. Since the blade attachment step is the same as that in the first embodiment, the description thereof is omitted here.

[0057] Thereafter, 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 the present embodiment includes a blade removal process of removing the blade 101 from the hub 102 while suspending the blade 101 via the blade wire 11 by the blade winch 12. According to the above configuration, the blade 101 can be removed from the hub 102 by using the blade winch 12 and the blade wire 11.

[0059] Note that the present disclosure is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.

[0060] For example, as shown in FIG. 8, the lower structure 200 may be a jacket structure J which is a seated 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 attachment member 31 to which the blade winch 12 is attached is attached to the transition piece T.

[0061] As shown in FIG. 9, the lower structure 200 may be a floating foundation. The floating foundation is configured by supporting a floating body F floating on the sea by a floating body wire W connected to the seabed. In this case, the winch attachment member 31 to which the blade winch 12 is attached is attached to the floating body F.

[0062] In addition, within the scope not departing from the gist of the present disclosure, it is possible to appropriately replace the components in the above-described embodiment with well-known components, and the above-described modifications may be appropriately combined.

[0063] (Supplementary Note) The construction system and the construction method according to the above-described embodiment are understood as follows, for example. <1>The construction system according to one aspect of the present disclosure is a construction system for constructing a wind turbine having a blade, a hub, a nacelle, and a tower, comprising a wire, a winch capable of lifting the blade by the wire, and a first pulley around which the wire is wound, wherein the first pulley is outside the nacelle and is disposed on the side opposite to the blade with respect to the tower. According to the above configuration, the first pulley is outside the nacelle and is disposed on the side opposite to the blade with respect to the tower. Therefore, the winch can be disposed at a position where it is less likely to interfere during blade construction, and the work efficiency during blade construction can be improved.

[0064] <2>In the construction system according to <1> above, the first pulley may be disposed on the same side as the winch with respect to the tower. According to the above configuration, it becomes easier to lift the blade by the wire, and the work efficiency during blade construction can be improved.

[0065] <3>The construction system according to <1> or <2> above may further comprise a second pulley around which the wire is wound, and the second pulley may be disposed on the side opposite to the first pulley with respect to the tower. According to the above configuration, it becomes easier to lift the blade by the wire, and the work efficiency during blade construction can be improved.

[0066] <4>The construction system according to <3> above may further comprise a first attachment member to which the first pulley and the second pulley are attached, and the first attachment member may be attached to the tower. According to the above configuration, the first pulley and the second pulley can be easily fixed to the tower.

[0067] <5>The construction system according to any one of <1> to <4> above may further comprise a crane for suspending the blade. According to the above configuration, when lifting the blade by wire, the crane can be used to suspend the blades in pairs, and the construction can be carried out without damaging the blades.

[0068] <6>In the construction system according to any one of <1> to <5> above, the wind turbine may be an offshore wind power generation wind turbine. According to the above configuration, even in the ocean where an onshore construction crane cannot be used, the blade can be constructed.

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

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

[0071] <9>In the construction system according to <7> above, the tower and the fixed-bottom foundation are connected by a transition piece, and the construction system includes a second attachment member to which the winch is attached, and the second attachment member may be attached to the transition piece. According to the above configuration, since the winch can be fixed to the transition piece, the reaction force caused by the operation of the winch can be received by the transition piece.

[0072] <10>The construction system according to any one of <6> to <9> above may include a barge on which the blade is placed. According to the above configuration, the blade before construction (before lifting) can be placed on the barge. Also, the blade can be transported to the construction site by the barge.

[0073] <11>The construction system according to <3> above includes a pair of the first pulleys, a pair of the second pulleys, a pair of the winches, and a pair of the wires. One of the pair of the first pulleys, one of the pair of the second pulleys, one of the pair of the winches, and one of the pair of the wires, and the other of the pair of the first pulleys, the other of the pair of the second pulleys, the other of the pair of the winches, and the other of the pair of the wires may be distributed and arranged on one side with respect to the tower and the other side with respect to the tower in a direction orthogonal to the rotation axis of the hub in plan view. According to the above configuration, the blade can be stably lifted by a pair of wires.

[0074] <12>The construction system according to any one of <1> to <11> above may include a jig attached to the blade and to which the end of the wire is attached. According to the above configuration, the end of the wire can be easily and surely fixed to the blade via the jig.

[0075] <13>In the construction system according to <12> above, the jig may be divisible into a plurality of members while sandwiching the blade. According to 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 a blade, a hub, a nacelle, and a tower, including a winch installation step of installing a winch capable of lifting the blade by a wire, and a first pulley installation step of installing a first pulley around which the wire is wound. In the first pulley installation step, the first pulley is arranged outside the nacelle and on the side opposite to the blade with respect to the tower. According to the above configuration, the first pulley is outside the nacelle and is arranged on the side opposite to the blade with respect to the tower. Therefore, the winch can be arranged at a position where it is less likely to interfere when constructing the blade, and the working efficiency when constructing the blade can be improved.

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

[0078] <16>The construction method according to the above <14> may include a blade removal step of removing the blade from the hub while lowering the blade via the wire by the winch. According to the above configuration, the blade can be removed from the hub using the winch and the wire.

[0079] <17>The construction method according to any one of the above <14> to <16> may include a winch removal step of removing the winch. According to the above configuration, after the blade is constructed, by removing the winch, the winch can be prevented from getting in the way.

[0080] <18>The construction method according to any one of the above <14> to <17> may include a first pulley removal step of removing the first pulley. According to the above configuration, after the blade is constructed, by removing the first pulley, the first pulley can be prevented from getting in the way.

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

[0082] <20>The construction method according to the above <19> may include a jig removal step of removing the jig from the blade. According to the above configuration, after the blade is constructed, the jig can be removed from the blade so that the jig does not get in the way.

Explanation of Reference Numerals

[0083] 1 Construction system 11 Blade wire (wire) 12 Blade winch (winch) 13 First pulley 14 Second pulley 15 Jig 21 Crane 22 Barge 31 Winch attachment member (second attachment member) 32 Pulley attachment member (first attachment member) 100 Wind turbine 101 Blade 102 Hub 103 Nacelle 104 Tower J Jacket structure (jacket foundation) M Monopile (monopile foundation) F Floating body (floating foundation) T Transition piece

Claims

1. 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 blade by the wire; a first pulley around which the wire is wound, the construction system further comprising: wherein the first pulley is outside the nacelle and is arranged on the side opposite to the blade with respect to the tower in the horizontal direction.

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

3. a second pulley around which the wire is wound, the construction system further comprising: wherein the second pulley is arranged on the side opposite to the first pulley with respect to the tower.

4. a first attachment member to which the first pulley and the second pulley are attached, the construction system further comprising: wherein the first attachment 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 an offshore wind turbine.

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 further comprising: a second attachment member to which the winch is attached, the construction system further comprising: wherein the second attachment member is attached to the transition piece.

10. The construction system according to claim 6, further comprising a barge for placing the blade.

11. a pair of the first pulleys; a pair of the second pulleys; a pair of the winches; a pair of the wires, the construction system further comprising: One of the pair of the first pulleys, one of the pair of the second pulleys, one of the pair of the winches, and one of the pair of the wires, and the other of the pair of the first pulleys, the other of the pair of the second pulleys, the other of the pair of the winches, and the other of the pair of the wires are arranged separately on one side with respect to the tower and on the other side with respect to the tower in a direction perpendicular to the rotation axis of the hub in a plan view, the construction system according to claim 3.

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

13. The construction system according to claim 12, wherein the jig is separable into a plurality of members with the blade sandwiched therebetween.

14. A construction method for constructing a wind turbine having a blade, a hub, a nacelle, and a tower, comprising: a winch installation step of installing a winch capable of lifting the blade by a wire; a first pulley installation step of installing a first pulley around which the wire is wound; and the first pulley installation step includes arranging the first pulley outside the nacelle and on a side opposite to the blade with respect to the tower in a horizontal direction.

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

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

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