Production method

Abstract

To provide a manufacturing method that can improve production efficiency. [Solution] A manufacturing method comprising: a medium block manufacturing step in which multiple small blocks 21-28, 51-58, which are part of a floating structure that supports an offshore wind turbine, are connected by a crane in a crane yard to manufacture multiple medium blocks 11, 12; and a large block manufacturing step in which multiple medium blocks 11, 12 are connected in an integrated yard to manufacture a large block, wherein the method further comprises a first transport step in which the multiple medium blocks 11, 12 manufactured in the medium block manufacturing step are transported from the crane yard to the integrated yard, and the weight of at least one of the multiple medium blocks 11, 12 manufactured in the medium block manufacturing step exceeds the lifting capacity of the crane.

Description

Technical Field

[0001] The present disclosure relates to a manufacturing method.

Background Art

[0002] Manufacturing a floating foundation in a yard has been considered. Patent Document 1 discloses a plurality of manufacturing yards for manufacturing a plurality of types of divided bodies constituting a semi-submersible type foundation, and a connection yard for connecting the divided bodies to manufacture a floating foundation.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the manufacturing method of Patent Document 1 had room for improvement in terms of manufacturing efficiency.

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

Means for Solving the Problems

[0006] <1>The manufacturing method according to Aspect 1 of the present disclosure is In a crane yard, a middle block manufacturing step of manufacturing a plurality of middle blocks, which are a part of a floating structure supporting an offshore wind turbine, by connecting a plurality of small blocks, which are a part of the floating structure, with a crane, and In an integration yard, a large block manufacturing step of connecting a plurality of the middle blocks to manufacture a large block, which is a part of the floating structure, A manufacturing method comprising A first transport step involves transporting the multiple intermediate blocks produced in the intermediate block manufacturing step from the crane yard to the integration yard. Furthermore, The weight of at least one of the multiple intermediate blocks produced in the intermediate block production step exceeds the lifting capacity of the crane. It is characterized by the following: [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a manufacturing method that can improve manufacturing efficiency. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic side view showing the main body of the floating structure. [Figure 2] This is a schematic plan view showing the main body of the floating structure. [Figure 3] This is a schematic plan view showing the manufacturing site where the floating structure is produced. [Figure 4] This is a perspective view illustrating a manufacturing method according to an embodiment, showing the process carried out in a crane yard. [Figure 5] This is a perspective view illustrating a manufacturing method according to an embodiment, showing the process carried out in an integrated yard. [Modes for carrying out the invention]

[0009] A manufacturing method according to one embodiment of this disclosure will be described below with reference to the drawings. Figure 1 is a schematic side view showing the main body 10 (large block) of the floating structure. Figure 2 is a schematic plan view showing the main body 10 (large block) of the floating structure.

[0010] First, the floating structure body 10, which is part of the floating structure manufactured by the manufacturing method according to the embodiment, will be described with reference to Figures 1 and 2. The floating structure body 10 will be painted and accessories will be attached to become the floating structure 1 shown in Figure 3. Here, a semi-submersible type floating structure 1 will be used as an example, but this manufacturing method can also be applied to floating structures other than the semi-submersible type. For example, it can be applied to pontoon type (barge type), spar type, and TLP (Tension Leg Platform) type floating structures. The floating structure body 10 is made of steel and has a central member 11 (middle block) which is a center column, horizontal braces 12 (middle block) which are legs, and connecting braces 13.

[0011] The central member 11 extends in the vertical direction and comprises, from bottom to top, a first central component 21 (small block), a second central component 22 (small block), a third central component 23 (small block), a fourth central component 24 (small block), a fifth central component 25 (small block), a sixth central component 26 (small block), a seventh central component 27 (small block), and an eighth central component 28 (small block).

[0012] The first central component 21 is made of steel and has a main pipe section 31 made from a cylindrical steel pipe and branch pipe sections 32 made from cylindrical steel pipes. The main pipe section 31 is oriented along its central axis in the vertical direction. The main pipe section 31 is open at the top and closed at the bottom by a steel plate (not shown). The branch pipe section 32 is fixed to the outer surface of the main pipe section 31 by welding, with its central axis aligned in a direction perpendicular to the central axis of the main pipe section 31. Therefore, the branch pipe section 32 protrudes outward from the main pipe section 31 in the radial direction. The first central component 21 has multiple similar branch pipe sections 32, specifically three, at equal intervals in the circumferential direction of the main pipe section 31.

[0013] The second central component 22 is made of steel and is fabricated from a cylindrical steel pipe with the same diameter as the branch pipe portion 32 of the first central component 21. The second central component 22 has its central axis along the horizontal direction. The second central component 22 extends outward in the radial direction from the branch pipe portion 32 of the first central component 21 toward the main pipe portion 31. The peripheral edge of one axial end of the second central component 22 is fixed by welding to the peripheral edge of the end of the branch pipe portion 32 of the first central component 21 on the side opposite to the main pipe portion 31. Similar second central components 22 are similarly fixed by welding to each of the plurality of branch pipe portions 32 of the first central component 21.

[0014] The third central component 23 is made of steel and is fabricated from a cylindrical steel pipe with the same diameter as the main pipe portion 31 of the first central component 21. The third central component 23 has its central axis along the vertical direction, and the peripheral edge of the lower end is fixed by welding to the peripheral edge of the upper end of the main pipe portion 31 of the first central component 21. The fourth central component 24 is made of steel and is fabricated from a cylindrical steel pipe with the same diameter as the third central component 23. The fourth central component 24 has its central axis along the vertical direction, and the peripheral edge of the lower end is fixed by welding to the peripheral edge of the upper end of the third central component 23.

[0015] The fifth central component 25 is made of steel and has a main pipe portion 41 fabricated from a cylindrical steel pipe with the same diameter as the fourth central component 24, and branch pipe portions 42 fabricated from cylindrical steel pipes. The main pipe portion 41 has its central axis along the vertical direction. The branch pipe portion 42 is fixed to the outer peripheral surface of the main pipe portion 41 by welding with its central axis along a direction intersecting the central axis of the main pipe portion 41 at an acute angle. The branch pipe portion 42 protrudes downward and forward from the main pipe portion 41 toward the outside in the radial direction of the main pipe portion 41. The fifth central component 25 has a plurality of similar branch pipe portions 42, specifically three, at equal intervals in the circumferential direction of the main pipe portion 41. The plurality of branch pipe portions 42 of the fifth central component 25 are each in phase with the corresponding one of the second central component 22. The fifth central component 25 is fixed by welding the peripheral edge of the lower end of the main pipe portion 41 to the peripheral edge of the upper end of the fourth central component 24.

[0016] The sixth central component 26 is made of steel and is fabricated from a cylindrical steel pipe having the same diameter as the main pipe portion 41 of the fifth central component 25. The sixth central component 26 has its central axis along the vertical direction, and the peripheral edge of the lower end is fixed to the peripheral edge of the upper end of the main pipe portion 41 of the fifth central component 25 by welding. The seventh central component 27 is made of steel and is fabricated from a cylindrical steel pipe having the same diameter as the sixth central component 26. The seventh central component 27 has its central axis along the vertical direction, and the peripheral edge of the lower end is fixed to the peripheral edge of the upper end of the sixth central component 26 by welding. The eighth central component 28 is made of steel and is fabricated from a cylindrical steel pipe having the same diameter as the seventh central component 27. The eighth central component 28 has its central axis along the vertical direction, and the peripheral edge of the lower end is fixed to the peripheral edge of the upper end of the seventh central component 27 by welding. The eighth central component 28 has a closing portion 29 that closes the upper end portion. The closing portion 29 is made of steel and extends horizontally. Note that the closing portion 29 may or may not be provided. The central member 11 is connected such that the main pipe portion 31 of the first central component 21, the third central component 23, the fourth central component 24, the main pipe portion 41 of the fifth central component 25, the sixth central component 26, the seventh central component 27, and the eighth central component 28 constitute the same cylinder extending in the vertical direction with their central axes aligned.

[0017] The horizontal brace 12 is a member that extends horizontally, and extends from the second central component 22 of the central member 11 in the opposite direction to the first central component 21. The horizontal brace 12 has, in order from the central member 11 side, a first horizontal component 51 (small block), a second horizontal component 52 (small block), a third horizontal component 53 (small block), a fourth horizontal component 54 (small block), a first end component 55 (small block), a second end component 56 (small block), a third end component 57 (small block), and a fourth end component 58 (small block).

[0018] The first horizontal component 51 is made of steel and is manufactured from a cylindrical steel pipe having the same diameter as the second central component 22 of the central component 11. The first horizontal component 51 has its central axis aligned horizontally and extends from the second central component 22 in the opposite direction to the first central component 21. The peripheral edge of one end of the first horizontal component 51 in the axial direction is fixed by welding to the peripheral edge of the second central component 22 on the opposite end from the first central component 21.

[0019] The second horizontal component 52 is made of steel and has a main pipe section 61 made from a cylindrical steel pipe having the same diameter as the first horizontal component 51, and a branch pipe section 62 made from a cylindrical steel pipe having the same diameter as the branch pipe section 42 of the fifth central component 25 of the central component 11. The main pipe section 61 has its central axis aligned horizontally. The branch pipe section 62 is fixed to the outer surface of the main pipe section 61 by welding, with its central axis aligned in a direction that intersects the central axis of the main pipe section 61 at an acute angle. The branch pipe section 62 protrudes upward from the upper part of the main pipe section 61 toward the central member 11. The peripheral edge of one end of the main pipe section 61 in the axial direction of the second horizontal component member 52 is fixed to the peripheral edge of the end of the first horizontal component member 51 opposite to the second central component member 22 by welding.

[0020] The third horizontal component 53 is made of steel and is manufactured from a cylindrical steel pipe having the same diameter as the main pipe section 61 of the second horizontal component 52. The peripheral edge of one axial end of the third horizontal component 53 is fixed by welding to the peripheral edge of the end of the main pipe section 61 of the second horizontal component 52 that is opposite to the first horizontal component 51.

[0021] The fourth horizontal component 54 is made of steel and is manufactured from a cylindrical steel pipe of the same diameter as the third horizontal component 53. The peripheral edge of the axial end of the fourth horizontal component 54 is fixed by welding to the peripheral edge of the end of the third horizontal component 53 opposite to the second horizontal component 52.

[0022] The first end component 55 is made of steel and is manufactured from a cylindrical steel pipe. The first end component 55 has its central axis aligned in the vertical direction, and its outer surface is fixed by welding to the peripheral edge of the end of the fourth horizontal component 54 opposite to the third horizontal component 53. The lower part of the first end component 55 is closed with a steel plate (not shown). The second end component 56 is made of steel and is manufactured from a cylindrical steel pipe having the same diameter as the first end component 55. The peripheral edge of one axial end of the second end component 56 is fixed to the peripheral edge of the upper end of the first end component 55 by welding. The third end component 57 is made of steel and is manufactured from a cylindrical steel pipe of the same diameter as the second end component 56. The peripheral edge of one axial end of the third end component 57 is fixed to the peripheral edge of the upper end of the second end component 56 by welding. The fourth end component 58 has a cylindrical portion 71 and a closing portion 72. The cylindrical portion 71 is made of steel and is manufactured from a steel pipe of the same diameter as the third end component 57. The peripheral edge of one axial end of the cylindrical portion 71 is fixed to the peripheral edge of the upper end of the third end component 57 by welding. The closure portion 72 is made from a steel plate and closes the upper end of the cylindrical portion 71.

[0023] The horizontal brace 12 has its central axis aligned with the first horizontal component 51, the main pipe portion 61 of the second horizontal component 52, the third horizontal component 53, and the fourth horizontal component 54, and the first horizontal component 51, the main pipe portion 61 of the second horizontal component 52, the third horizontal component 53, and the small diameter portion of the fourth horizontal component 54 are connected to form the same horizontally extending cylinder.

[0024] Similar horizontal braces 12 are similarly welded to each of the multiple second central components 22 of the central member 11. Therefore, the floating structure body 10 is provided with multiple horizontal braces 12, specifically three. Here, the multiple horizontal braces 12 are arranged within the same cylinder, with each branch pipe section 62 of the second horizontal component 52 aligning its central axis with the corresponding branch pipe section 42 of the fifth central component 25 of the central member 11.

[0025] The connecting brace 13 is made of steel and is constructed from a cylindrical steel pipe of the same diameter as the branch pipe section 42 of the fifth central component 25 of the central member 11 and the branch pipe section 62 of the second horizontal component 52. The connecting brace 13 connects the branch pipe section 62 of the second horizontal component 52 and the branch pipe section 42 of the fifth central component 25, whose central axes coincide. The peripheral edge of one axial end of the connecting brace 13 is fixed by welding to the peripheral edge of the end of the branch pipe section 42 of the fifth central component 25 of the central member 11 that is opposite to the main pipe section 41, and the peripheral edge of the other axial end is fixed by welding to the peripheral edge of the end of the branch pipe section 62 of the second horizontal component 52 that is opposite to the main pipe section 61. The connecting brace 13 is fixed by welding to each pair of the branch pipe section 62 of the second horizontal component 52 and the branch pipe section 42 of the fifth central component 25, whose central axes coincide. Therefore, the floating structure body 10 is equipped with multiple connecting braces 13, specifically three of them.

[0026] The floating structure body 10, with the above configuration, will float near the sea surface in its lower section, which includes a plurality of horizontal braces 12 and a first central component 21 and a plurality of second central components 22 of the central member 11, and a wind turbine tower (not shown) will be installed at the closed section 29 at the upper end. Therefore, the first central component 21, the second central component 22, the third central component 23, the fourth central component 24, the fifth central component 25, the sixth central component 26, the seventh central component 27, the eighth central component 28 with a closing section 29, the first horizontal component 51, the second horizontal component 52, the third horizontal component 53, the fourth horizontal component 54, the first end component 55, the second end component 56, the third end component 57, and the fourth end component 58 with a closing section 72 are each part of the floating structure 1.

[0027] Next, we will describe the manufacturing site F where the floating structure 1 is produced. Figure 3 is a schematic plan view of the manufacturing site F where the floating structure 1 is fabricated.

[0028] At the manufacturing site F, a crane facility E is installed near the quay Q of the pier W. The crane facility E has a track R laid along the quay Q, and cranes C mounted on this track R so as to be able to move along this track R. In this embodiment, the crane facility E is equipped with multiple cranes C, specifically two cranes C, which share the track R. In other words, in the crane facility E, the track R on which one crane C (first crane) moves and the track R on which another crane C (second crane) moves are the same. Note that the number of cranes C mounted so as to be able to move along the track R is not limited to two; it may be one or three or more. In this embodiment, two cranes C are provided. Crane C is a jib crane with a swivelable arm. While a cantilevered gantry crane could also be used as Crane C, a jib crane is preferred due to its larger working area.

[0029] In Figure 3, the dashed line surrounding the crane equipment E indicates the slewing range X of the two cranes C. Since the two cranes C can move horizontally along the track R, the slewing range X of the two cranes C extends horizontally along the track R. This slewing range X includes the sea S and the pier W, and the portion of this slewing range X located at the pier W is the crane yard Y1 where assembly is carried out using the cranes C.

[0030] Figure 4 is a perspective view illustrating the manufacturing method according to the embodiment, showing the process carried out in the crane yard Y1. As shown in Figure 1, the floating structure body 10 consists of a first central component 21, a second central component 22, a third central component 23, a fourth central component 24, a fifth central component 25, a sixth central component 26, a seventh central component 27, an eighth central component 28 with a closing section 29, a first horizontal component 51, a second horizontal component 52, a third horizontal component 53, a fourth horizontal component 54, a first end component 55, a second end component 56, a third end component 57, and a fourth end component 58 with a closing section 72, all of which are manufactured separately. These first to eighth central components 21 to 28, first to fourth horizontal components 51 to 54, and first to fourth end components 55 to 58 are manufactured, for example, in a factory.

[0031] The manufacturing method according to this embodiment includes a middle block manufacturing step in which appropriate combinations of the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58, all of which are small blocks, are connected by crane C in crane yard Y1 to manufacture the central component 11 and the horizontal brace 12, all of which are middle blocks. Therefore, the weight of each of the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58, all of which are small blocks, connected in the middle block manufacturing step is less than the lifting capacity of crane C. In other words, the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58, all of which are small blocks and are connected in the middle block manufacturing step, are located within the slewing range X, and the lifting capacity of crane C, within the slewing range X, exceeds the weight of each of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 connected in this middle block manufacturing step.

[0032] The central block manufacturing step involves, for example, lifting the first central component 21 located in the crane yard Y1 using a crane C and placing it on a frame T1 located in the crane yard Y1 as shown in Figure 4(a). Additionally, multiple second central components 22 located in the crane yard Y1 are each lifted using a crane C and placed on corresponding frames T2 located in the crane yard Y1. These frames T2 are accessible to a transport trolley D and can be raised and lowered by the transport trolley D. Then, one second central component 22 on the frame T2 located in the crane yard Y1 is positioned to face a corresponding branch pipe section 32 of the first central component 21 on the frame T1, with a predetermined welding gap in between, using jacks, filler plates, etc. Here, the filler plates are inserted between the object and the frame after the height has been adjusted using jacks, etc., to support the object in place of the jacks. Then, in this state, the second central components 22 and branch pipe sections 32 are temporarily fixed together with erection pieces (not shown) and then secured by welding. Similarly, another second central component 22 located in the crane yard Y1 is fixed by welding to a corresponding branch pipe section 32 of the first central component 21, and yet another second central component 22 located in the crane yard Y1 is fixed by welding to a corresponding branch pipe section 32 of the first central component 21. That is, the second central components 22 are connected to the first central component 21 by crane C in the crane yard Y1. Also, the third central component 23 located in the crane yard Y1 is lifted using crane C and placed on the main pipe section 31 of the first central component 21 on the frame T1, with a predetermined welding gap in between. Then, in this state, the third central component 23 and the main pipe section 31 are temporarily fixed together with erection pieces (not shown) and then secured by welding. Specifically, at the crane yard Y1, the third central component 23 is connected to the first central component 21 by crane C. Next, the fourth central component 24, located at the crane yard Y1, is lifted using crane C and placed on the third central component 23 on the frame T1 with a predetermined welding gap in between. Then, in this state, the fourth central component 24 and the third central component 23 are temporarily assembled by fastening them with erection pieces (not shown), and then fixed in place by welding.Specifically, at the crane yard Y1, the fourth central component 24 is connected to the third central component 23 by the crane C.

[0033] As described above, the first central component 21, the multiple second central components 22, the third central component 23, and the fourth central component 24 are integrated at the crane yard Y1, and then painted to produce the central lower component 81 shown in Figure 4(b). Here, the lifting capacity of crane C is less than the weight of one central lower component 81 produced in this middle block production step, even within the slewing range X. However, the lifting capacity of crane C may exceed the weight of one central lower component 81 produced in this middle block production step, even within the slewing range X. After the central lower component 81 is produced, the support frame T1 that supported the first central component 21 is removed, and the central lower component 81 is supported by the multiple support frames T2 that supported the multiple second central components 22.

[0034] Here, since the slewing range X of crane C includes the sea S near the quay Q, at least one of the first central component 21, multiple second central components 22, third central component 23, and fourth central component 24, which are loaded onto a ship (not shown) docked at quay Q, may be lifted by crane C and connected at crane yard Y1 to form the central lower component 81. Such a process can be applied when at least one of the first central component 21, second central component 22, third central component 23, and fourth central component 24 is manufactured at a location different from the manufacturing site F where the middle block manufacturing step is performed, and is transported to the manufacturing site F by ship. The process may also include a transport step in which at least one of the first central component 21, second central component 22, third central component 23, and fourth central component 24 loaded on the ship is transported to crane yard Y1 by transport trolley. For example, the first central component 21 mounted on the ship is lifted by crane C and placed on a platform T1 in the crane yard Y1. Next, the first second central component 22 mounted on the ship is lifted by crane C and placed on a platform T2 in the crane yard Y1, and connected to one branch pipe section 32 of the first central component 21 on platform T1. Similarly, another second central component 22 mounted on the ship is lifted by crane C and connected to another branch pipe section 32 of the first central component 21. Yet another second central component 22 mounted on the ship is lifted by crane C and connected to yet another branch pipe section 32 of the first central component 21. Next, the third central component 23 mounted on the ship is lifted by crane C and connected to the first central component 21 on platform T1. Then, the fourth central component 24 mounted on the ship is lifted by crane C and connected to the third central component 23 in this state. In this way, the central lower component 81 can be manufactured from the first to fourth central components 21 to 24.

[0035] Furthermore, in the middle block manufacturing step, for example, the fifth central component 25 located in the crane yard Y1 is lifted using crane C and placed on the frame T3 located in the crane yard Y1 as shown in Figure 4(c). Next, the sixth central component 26 located in the crane yard Y1 is lifted using crane C and placed on the main pipe section 41 of the fifth central component 25 on the frame T3 with a predetermined welding gap. Then, in this state, the sixth central component 26 and the main pipe section 41 are temporarily fixed together with erection pieces (not shown) and then fixed by welding. That is, the sixth central component 26 is connected to the fifth central component 25 by crane C in the crane yard Y1. Next, the seventh central component 27 located in the crane yard Y1 is lifted using crane C and placed on the sixth central component 26 on the frame T3 with a predetermined welding gap. Then, in this state, the seventh central component 27 and the sixth central component 26 are temporarily fixed together with erection pieces (not shown) and then secured by welding. That is, at the crane yard Y1, the seventh central component 27 is connected to the sixth central component 26 by crane C. Next, the eighth central component 28, located at the crane yard Y1, is lifted using crane C and placed on the seventh central component 27 on the frame T3 with a predetermined welding gap in between. Then, in this state, the eighth central component 28 and the seventh central component 27 are temporarily fixed together with erection pieces (not shown) and then secured by welding. That is, at the crane yard Y1, the eighth central component 28 is connected to the seventh central component 27 by crane C.

[0036] As described above, in the crane yard Y1, as shown in Figure 4(d), the fifth central component 25, the sixth central component 26, the seventh central component 27, and the eighth central component 28 are integrated, and then painted to produce the central upper component 82. Here, the lifting capacity of the crane C of the crane equipment E exceeds the weight of one central upper component 82 produced in this middle block manufacturing step, as long as it is within the slewing range X. Here, since the crane equipment E is equipped with two cranes C, the weight of the central upper component 82 only needs to exceed the lifting capacity of one crane C within the slewing range X, as long as it is less than the lifting capacity of the two cranes C combined within the slewing range X. In other words, if the weight of the central upper component 82 exceeds the lifting capacity of one crane C within the slewing range X, then it is sufficient that the combined lifting capacity of two cranes C within the slewing range X exceeds the weight of one central upper component 82.

[0037] Here, when manufacturing the central upper component 82, at least one of the fifth central component 25, sixth central component 26, seventh central component 27, and eighth central component 28, which are loaded onto a ship docked at quay Q, may be lifted by crane C and connected at crane yard Y1. Such a process can be applied when at least one of the fifth central component 25, sixth central component 26, seventh central component 27, and eighth central component 28 is manufactured at a location different from the manufacturing site F where the middle block manufacturing step is performed, and is transported to the manufacturing site F by a ship (not shown). The process may also include a transport step in which at least one of the fifth central component 25, sixth central component 26, seventh central component 27, and eighth central component 28 loaded onto the ship is transported to crane yard Y1 by transport trolley. For example, the fifth central component 25, which is mounted on the ship, is lifted by crane C and placed on the frame T3 in the crane yard Y1. Next, the sixth central component 26, which is mounted on the ship, is lifted by crane C and connected to the fifth central component 25. Next, the seventh central component 27, which is mounted on the ship, is lifted by crane C and connected to the sixth central component 26. Next, the eighth central component 28, which is mounted on the ship, is lifted by crane C and connected to the seventh central component 27 to manufacture the central upper component 82.

[0038] In the middle block manufacturing step, for example, the central upper component 82, manufactured as described above and located in the crane yard Y1, is lifted using one crane C of the crane equipment E if the weight of the central upper component 82 is less than the lifting capacity of one crane C, or using two cranes C of the crane equipment E if the weight of the central upper component 82 is more than the lifting capacity of one crane C. The central lower component 82, manufactured as described above and located on the multiple frames T2 in the crane yard Y1, is positioned with a predetermined welding gap between the main pipe section 41 of the fifth central component 25 and the fourth central component 24. In this state, the main pipe section 41 and the fourth central component 24 are temporarily fixed together with erection pieces (not shown) and then fixed by welding. This manufactures the central member 11, which is the middle block, as shown in Figure 4(e). That is, in the crane yard Y1, the central upper component 82 is connected to the central lower component 81 by a crane C to form the central member 11. Therefore, the height of the central member 11, which is the middle block, is less than the lifting height of the crane C. The central member 11 is supported by the same multiple frames T2 that supported the multiple second central components 22.

[0039] As described above, in the middle block manufacturing step, the central upper component 82 and the central lower component 81 are integrated at the crane yard Y1, and then painted to manufacture the central component 11, which is the middle block. The central component 11 is part of the floating structure body 10. Here, the lifting capacity of crane C, even within the slewing range X, is less than the weight of one central component 11 manufactured in this middle block manufacturing step. Therefore, in the middle block manufacturing step, the central component 11, which is the middle block, is manufactured within the height range that can be assembled with the lifting height of crane C, until the weight exceeds the lifting capacity of crane C.

[0040] Furthermore, in the middle block manufacturing step, for example, the first end component 55 located in crane yard Y1 is lifted using crane C and placed on a frame (not shown) located in crane yard Y1. Next, the second end component 56 located in crane yard Y1 is lifted using crane C and placed on the first end component 55 on the frame (not shown) with a predetermined welding gap. Then, in this state, the second end component 56 and the first end component 55 are temporarily assembled by fastening them with erection pieces (not shown), and then fixed by welding. That is, in crane yard Y1, the second end component 56 is connected to the first end component 55 by crane C. Next, the third end component 57 located in crane yard Y1 is lifted using crane C and placed on the second end component 56 on the frame (not shown) with a predetermined welding gap. Then, in this state, the third end component 57 and the second end component 56 are temporarily fixed together with erection pieces (not shown) and then secured by welding. That is, at the crane yard Y1, the third end component 57 is connected to the second end component 56 by crane C. Next, the fourth end component 58, located at the crane yard Y1, is lifted using crane C and placed on the third end component 57 on a frame (not shown) with a predetermined welding gap in between. Then, in this state, the fourth end component 58 and the third end component 57 are temporarily fixed together with erection pieces (not shown) and then secured by welding. That is, at the crane yard Y1, the fourth end component 58 is connected to the third end component 57 by crane C. Furthermore, the fourth horizontal component 54, located in the crane yard Y1, is lifted using the crane C and placed on a plurality of frames T4 located in the crane yard Y1, while simultaneously being positioned on the first end component 55 on the frame (not shown) with a predetermined welding gap. In this state, the first end component 55 and the fourth horizontal component 54 are temporarily assembled using erection pieces (not shown), and then fixed in place by welding. In other words, the fourth horizontal component 54 is connected to the first end component 55 by the crane C in the crane yard Y1.

[0041] Furthermore, the third horizontal component 53 located in the crane yard Y1 is lifted using crane C and placed on a frame T5 located in the crane yard Y1. This frame T5 is accessible to a transport trolley D and can be raised and lowered by the transport trolley D. The fourth horizontal component 54 on frame T4 and the third horizontal component 53 on frame T5 are positioned facing each other with a predetermined welding gap between them, using jacks, filler plates, etc. Then, in this state, the fourth horizontal component 54 and the third horizontal component 53 are temporarily fixed together with erection pieces (not shown) and then fixed by welding. Next, the second horizontal component 52 located in the crane yard Y1 is lifted using crane C and placed on a plurality of frames T6 located in the crane yard Y1. The third horizontal component 53 on frame T5 and the main pipe section 61 of the second horizontal component 52 on frame T6 are positioned facing each other with a predetermined welding gap between them, using jacks, filler plates, etc. Then, in this state, the third horizontal component 53 and the main pipe section 61 are temporarily fixed together with erection pieces (not shown) and then secured by welding. Next, the first horizontal component 51 located in the crane yard Y1 is lifted using the crane C and placed on the frame T7 located in the crane yard Y1. The frame T7 is accessible to the transport trolley D and can be raised and lowered by the transport trolley D. Then, the main pipe section 61 of the second horizontal component 52 on the frame T6 and the first horizontal component 51 on the frame T7 are positioned facing each other with a predetermined welding gap in between, using jacks, filler plates, etc. Then, in this state, the main pipe section 61 and the first horizontal component 51 are temporarily fixed together with erection pieces (not shown) and then secured by welding. In this way, as shown in Figure 4(g), the horizontal brace 12, which is the middle block, is manufactured from the first to fourth horizontal component 51 to 54 and the first to fourth end component 55 to 58. Specifically, at the crane yard Y1, the first to fourth horizontal components 51 to 54 and the first to fourth end components 55 to 58 are connected by crane C to form the central block, which is the horizontal brace 12. Therefore, the height of the central block, the horizontal brace 12, is less than the lifting height of crane C.

[0042] As described above, in the middle block fabrication step, the first horizontal component 51, the second horizontal component 52, the third horizontal component 53, the fourth horizontal component 54, the first end component 55, the second end component 56, the third end component 57, and the fourth end component 58 are integrated at the crane yard Y1, and then painted to fabricate the horizontal brace 12, which is the middle block. The horizontal brace 12 is part of the floating structure body 10. Here, the lifting capacity of crane C is less than the weight of one horizontal brace 12 fabricated in this middle block fabrication step, as long as it is within the slewing range X. However, the lifting capacity of crane C may exceed the weight of one horizontal brace 12 fabricated in this middle block fabrication step, as long as it is within the slewing range X. After the horizontal brace 12 is fabricated, all frames except frame T7, which supported the first horizontal component 51, and frame T5, which supported the third horizontal component 53, such as frames T4 and T6, are removed, and the horizontal brace 12 is supported by frame T7, which supported the first horizontal component 51, and frame T5, which supported the third horizontal component 53.

[0043] Here, when manufacturing the horizontal brace 12, which is the middle block, at least one of the first horizontal component 51, the second horizontal component 52, the third horizontal component 53, the fourth horizontal component 54, the first end component 55, the second end component 56, the third end component 57, and the fourth end component 58, which are loaded onto a ship docked at quay Q, may be lifted by crane C and connected at crane yard Y1. Such a process can be applied when at least one of the first horizontal component 51, the second horizontal component 52, the third horizontal component 53, the fourth horizontal component 54, the first end component 55, the second end component 56, the third end component 57, and the fourth end component 58 is manufactured at a location different from the manufacturing site F where the middle block manufacturing step is performed, and is transported to the manufacturing site F by ship. The system may also include a transport process in which at least one of the first horizontal component 51, second horizontal component 52, third horizontal component 53, fourth horizontal component 54, first end component 55, second end component 56, third end component 57, and fourth end component 58, which are loaded onto the ship, is transported to the crane yard Y1 using a transport trolley.For example, the first end component 55 mounted on the ship is lifted by crane C and placed on a platform (not shown) in the crane yard Y1. Next, the second end component 56 mounted on the ship is lifted by crane C and connected to the first end component 55 on the platform (not shown) in the crane yard Y1. Next, the third end component 57 mounted on the ship is lifted by crane C and connected to the second end component 56 on the platform (not shown) in the crane yard Y1. Next, the fourth end component 58 mounted on the ship is lifted by crane C and connected to the third end component 57 on the platform (not shown) in the crane yard Y1. The fourth horizontal component 54 mounted on the ship is lifted by crane C and placed on a platform (not shown). The horizontal brace 12, which is the middle block, can be manufactured by placing it on the frame T4 of crane yard Y1 and connecting it to the first end component 55 on the frame (not shown) of crane yard Y1, then lifting the third horizontal component 53, which is mounted on the ship, with crane C and placing it on the frame T5 of crane yard Y1 and connecting it to the fourth horizontal component 54, then lifting the second horizontal component 52, which is mounted on the ship, with crane C and placing it on the frame T6 of crane yard Y1 and connecting it to the third horizontal component 53, and then lifting the first horizontal component 51, which is mounted on the ship, with crane C and placing it on the frame T7 of crane yard Y1 and connecting it to the second horizontal component 52.

[0044] As described above, in the manufacturing method of the embodiment, the weight of at least one of the central members 11 and horizontal braces 12, which are all central blocks and are manufactured in multiple quantities during the central block manufacturing step, exceeds the lifting capacity of the crane C of the crane equipment E. Here, since the crane equipment E is equipped with two cranes C, the weight of the central members 11 exceeds the lifting capacity of the two cranes C working together.

[0045] Here, the crane equipment E installed in the crane yard Y1 is equipped with multiple cranes C. Therefore, in the middle block manufacturing step, some of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 can be connected by one of the multiple cranes C (first crane), and other parts of the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 can be connected by another of the multiple cranes C (second crane). For example, a central member 11 can be manufactured by connecting multiple central members 21-28 (first members), which are part of the first to eighth central members 21-28, the first to fourth horizontal members 51-54, and the first to fourth end members 55-58, using one of the multiple cranes C (first crane C). Similarly, a horizontal brace 12 can be manufactured by connecting multiple horizontal members 51-54 and the first to fourth end members 55-58 (second members), which are another part of the first to eighth central members 21-28, the first to fourth horizontal members 51-54, and the first to fourth end members 55-58, using another of the multiple cranes C (second crane C). Furthermore, since the crane equipment E is equipped with multiple cranes C, it is also possible to perform tasks such as unloading from ships and assembling parts by using the combined lifting of multiple cranes C.

[0046] The manufacturing method of the embodiment includes a first transport step in which multiple central members 11 and horizontal braces 12, all of which are central blocks and manufactured in the central block manufacturing step at the crane yard Y1 as described above, are transported from the crane yard Y1 to the integration yard Y2 shown in Figure 3. Here, the integration yard Y2 is located further from the quay wall Q than the crane yard Y1. Multiple integration yards Y2, specifically six locations, are provided at the manufacturing site F. Here, in order to prevent tipping during transport in the first transport step, the height of the central member 11 may be set to three times or less its width.

[0047] In the first transport process, multiple frames T2 supporting the central member 11 are lifted by multiple transport trolleys D, and the central member 11, along with the frames T2, is transported to the integration yard Y2. Also in the first transport process, frames T5 and T7 supporting the horizontal braces 12 are lifted by multiple transport trolleys D, and the horizontal braces 12, along with the frames T5 and T7, are transported to the integration yard Y2. Thus, in the first transport process, the central member 11 and horizontal braces 12, which are manufactured in multiple quantities in the middle block manufacturing step, are transported from the crane yard Y1 to the integration yard Y2 by transport trolleys D. Here, the transport trolleys D are capable of entering beneath the frames T2, T5, and T7 and raising and lowering the frames T2, T5, and T7, and are, for example, multi-axle trolleys with many wheels. In the first transport process, one central member 11 is transported to a predetermined integrated yard Y2 using a transport trolley D, and multiple horizontal braces 12, specifically three horizontal braces, are also transported to the same integrated yard Y2 using the transport trolley D.

[0048] In the first transport process, one central component 11 (first central block) manufactured in the central block manufacturing step is transported from the crane yard Y1 to the first integration yard Y2 (first integration yard Y2) using multiple transport trolleys D. Subsequently, using the same multiple transport trolleys D that transported this central component 11, another central component 11 (second central block) manufactured in the central block manufacturing step is transported from the crane yard Y1 to another integration yard Y2 (second integration yard Y2). In this way, in the first transport process, the same multiple transport trolleys D are used to transport multiple central components 11, transporting the central components 11 from the crane yard Y1 to each of the multiple integration yards Y2.

[0049] Furthermore, in the first transport process, one horizontal brace 12 (first middle block) manufactured in the middle block manufacturing step is transported from the crane yard Y1 to a single integration yard Y2 (first integration yard Y2) using multiple transport trolleys D. Subsequently, another horizontal brace 12 (first middle block) is transported to the integration yard Y2 (first integration yard Y2) using the same multiple transport trolleys D that transported the first horizontal brace 12. Then, yet another horizontal brace 12 (first middle block) is transported to the integration yard Y2 (first integration yard Y2) using the same multiple transport trolleys D that transported the previous horizontal brace 12. In this way, three horizontal braces 12 (first middle blocks) are transported from the crane yard Y1 to the integration yard Y2 (first integration yard Y2) in the first transport process. In the first transport process, the same transport trolleys D that transported these three horizontal braces 12 are then used to transport three more horizontal braces 12 (the second middle block), which are manufactured in the middle block manufacturing step, from the crane yard Y1 to another integration yard Y2 (the second integration yard Y2) in the same manner. In this way, the same transport trolleys D are used for transporting multiple horizontal braces 12, transporting them from the crane yard Y1 to each of the multiple integration yards Y2. However, the three horizontal braces 12 that are assembled to one central member 11 in one integration yard Y2 may be transported one by one from the crane yard Y1 to the same integration yard Y2 using different transport trolleys D. This allows the three horizontal braces 12 to be transported in parallel.

[0050] Alternatively, the first transport process can be modified as follows: In the middle block manufacturing step, one central member 11 (first middle block) manufactured is transported from the crane yard Y1 to the integration yard Y2 (first integration yard Y2) using multiple transport carts D. On the other hand, another central member 11 (second middle block) manufactured in the middle block manufacturing step is transported from the crane yard Y1 to another integration yard Y2 (second integration yard Y2) using multiple transport carts D separate from those transporting the first central member 11. In this way, the central members 11 may be transported separately from the crane yard Y1 to each of the multiple integration yards Y2 using multiple separate transport carts D. In this case, the central members 11 can be transported in parallel from the crane yard Y1 to the multiple integration yards Y2.

[0051] In the intermediate block manufacturing step, one horizontal brace 12 (first intermediate block) manufactured is transported from the crane yard Y1 to the first integration yard Y2 (first integration yard Y2) using multiple transport trolleys D. Then, another horizontal brace 12 (first intermediate block) is transported to the same integration yard Y2 (first integration yard Y2) using the same multiple transport trolleys D that transported the first horizontal brace 12. Then, yet another horizontal brace 12 (first intermediate block) is transported to the same integration yard Y2 (first integration yard Y2) using the same multiple transport trolleys D that transported the previous horizontal brace 12. In this way, three horizontal braces 12 (first intermediate blocks) are transported from the crane yard Y1 to the integration yard Y2 (first integration yard Y2). On the other hand, using a different transport trolley D than the one that transports these horizontal braces 12, three more horizontal braces 12 (second central block) manufactured in the central block manufacturing step are transported from the crane yard Y1 to another integration yard Y2 (second integration yard Y2) in the same manner. In this way, multiple separate transport trolleys D can be used to transport multiple horizontal braces 12 separately, so that the horizontal braces 12 are transported from the crane yard Y1 to each of the multiple integration yards Y2. In this case, the central member 11 can be transported in parallel from the crane yard Y1 to the multiple integration yards Y2. It is also possible to transport three horizontal braces 12 that are assembled to one central member 11 in one integration yard Y2 from the crane yard Y1 to the same integration yard Y2 using multiple separate transport trolleys D. This allows three horizontal braces 12 that are transported to the same crane yard Y1 to be transported in parallel.

[0052] Figure 5 is a perspective view illustrating the manufacturing method according to the embodiment, showing the process carried out in the integrated yard Y2. The manufacturing method according to this embodiment includes a large block manufacturing step in which, as shown in Figure 5, a plurality of central members 11 and horizontal braces 12, all of which are medium blocks, are connected in an integrated yard Y2 to manufacture the floating structure body 10 (large block) shown in Figure 1, which is part of the floating structure 1. The floating structure body 10 is painted and accessories (not shown) are attached to it to become the floating structure 1.

[0053] In the large block manufacturing step, as shown in Figure 5, horizontal braces 12 are connected to the central member 11 at the integrated yard Y2. For example, one horizontal brace 12 is moved closer to one of the second central components 22 of the central member 11 by transporting it on the transport trolley D along with the frames T5 and T7, and then the frames T2, T5 and T7 are raised and lowered to align the positions. After that, using jacks, filler plates, etc., the first horizontal component 51 of this horizontal brace 12 is positioned opposite the second central component 22 with a predetermined welding gap in between. Then, in this state, the second central component 22 and the first horizontal component 51 are temporarily fixed together with erection pieces (not shown) and then fixed by welding. Similarly, another horizontal brace 12 is welded to another second central component 22 of the central member 11, and yet another horizontal brace 12 is welded to yet another second central component 22 of the central member 11. The floating structure body 10, which is a large block, is manufactured in this way at the integrated yard Y2. Thus, in the manufacturing method according to this embodiment, in the large block manufacturing step, multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, are connected in the integrated yard Y2 by moving and raising and lowering them with a transport trolley D, thereby manufacturing the floating structure body 10, which is a large block. Furthermore, in the large block manufacturing step, the transport trolley D raises and lowers multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, via frames T2, T5, and T7. In the large block manufacturing step, the multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, are connected while placed on frames T2, T5, and T7.

[0054] Here, the weight of the central member 11 exceeds the lifting capacity of crane C of the crane equipment E in crane yard Y1. In this case, since crane equipment E is equipped with two cranes C, the lifting capacity corresponding to simultaneous lifting by the two cranes C is exceeded. Therefore, it cannot be lifted by crane C of crane equipment E. However, since the central member 11 is supported by the transport trolley D, it can be raised and lowered by the transport trolley D, making height adjustment during assembly easy. Multiple central members 11 and horizontal braces 12, all of which are middle blocks, have a weight that exceeds the lifting capacity of a crawler crane (not shown), making transport and height adjustment difficult with a crawler crane. However, by using the transport trolley D, multiple central members 11 and horizontal braces 12, all of which are middle blocks, can be transported from crane yard Y1 to integration yard Y2, and their height adjustment during assembly can be performed simultaneously.

[0055] In the large block manufacturing step, the connecting braces 13 are then connected to the connected central member 11 and horizontal braces 12 at the integrated yard Y2. For example, at the integrated yard Y2, one connecting brace 13 is lifted by a crawler crane (not shown), and this connecting brace 13 is positioned between one branch pipe section 42 of the fifth central component 25 of the central member 11 and one branch pipe section 62 of the second horizontal component 52 of the horizontal brace 12, which aligns the central axis with this branch pipe section 42. In this state, one end of the connecting brace 13 and the branch pipe section 42 are temporarily fixed with an erection piece (not shown), and the other end of the connecting brace 13 and the branch pipe section 62 are temporarily fixed with an erection piece (not shown) and assembled. Subsequently, one end of the connecting brace 13 is welded to the branch pipe section 42, and the other end of the connecting brace 13 is welded to the branch pipe section 62. Similarly, another connecting brace 13 is welded to another branch pipe section 42 of the fifth central component 25 and to another branch pipe section 62 of the second horizontal component 52 that aligns its central axis with this branch pipe section 42. Yet another connecting brace 13 is welded to yet another branch pipe section 42 of the fifth central component 25 and to yet another branch pipe section 62 of the second horizontal component 52 that aligns its central axis with this branch pipe section 42. In this way, the large block floating structure body 10 is manufactured in the integrated yard Y2. Therefore, in the manufacturing method according to this embodiment, in the large block manufacturing step, multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, are connected by moving and raising / lowering them using a transport trolley D in the integrated yard Y2, thereby manufacturing the floating structure body 10, which is a large block. Also in the large block manufacturing step, the transport trolley D raises and lowers multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, via frames T2, T5, and T7. Also in the large block manufacturing step, multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, are connected while placed on frames T2, T5, and T7.

[0056] Then, in the large block manufacturing step, the floating structure body 10 is painted at the integrated yard Y2, and the floating structure 1 is completed by attaching the specified accessories (not shown in the diagram).

[0057] Here, multiple integrated yards Y2 are provided. Therefore, in the large block manufacturing step, in one integrated yard Y2 (first integrated yard), multiple central members 11 (first intermediate blocks) and horizontal braces 12 (first intermediate blocks), all of which are intermediate blocks, are connected to manufacture one floating structure body 10 (first large block), which is part of the floating structure 1. Furthermore, in another integrated yard Y2 (second integrated yard), multiple other central members 11 (second intermediate blocks) and other horizontal braces 12 (second intermediate blocks), all of which are intermediate blocks, are connected to manufacture another floating structure body 10 (second large block), which is part of the floating structure 1. This can be done in all integrated yards Y2.

[0058] Furthermore, multiple integrated yards Y2 are provided, and since the large block manufacturing step can be performed in each of them, the floating structure body 10 (first large block) manufactured in the large block manufacturing step will undergo one of the following: assembly, welding, painting, or attachment of accessories, while the floating structure body 10 (second large block) manufactured in the large block manufacturing step will undergo one of the following: assembly, welding, painting, or attachment of accessories, in another integrated yard Y2 (second integrated yard). This allows the equipment necessary for assembly, welding, painting, and attachment of accessories to be shared among multiple floating structure bodies 10. For example, while the first floating structure body 10 (first large block), which is being manufactured in the large block manufacturing step at one integrated yard Y2 (first integrated yard), is being painted or having accessories attached after assembly, assembly of another floating structure body 10 (second large block), which is being manufactured in the large block manufacturing step at another integrated yard Y2 (second integrated yard), is being carried out using the transport trolley D. This allows the transport trolley D required for assembly to be shared between the first floating structure body 10 (first large block) and the other floating structure body 10 (second large block). Furthermore, for example, while painting is being carried out on one floating structure body 10 (first large block) being manufactured in the large block manufacturing step at one integrated yard Y2 (first integrated yard), accessories are being attached to another floating structure body 10 (second large block) being manufactured in the large block manufacturing step at another integrated yard Y2 (second integrated yard) using attachment equipment. This allows the painting equipment and attachment equipment to be shared between the first floating structure body 10 (first large block) and the other floating structure body 10 (second large block).

[0059] The manufacturing method according to this embodiment includes a second transport step in which the floating structure 1, manufactured in the large block manufacturing step, is transported from the integrated yard Y2 to the quay Q using a transport trolley D. At this time, the floating structure 1 is placed on a support frame T2, and the floating structure 1 together with the support frame T2 is lifted by the transport trolley D and transported to the quay Q, where the floating structure 1 is transferred to a transport vessel, a barge B, and shipped. Note that all support frames T2 that support one floating structure 1 are arranged so that the orientation of the transport trolley D is aligned while the floating structure 1 is being supported.

[0060] In this process, to manufacture a single floating structure 1, the multiple frames T2 that initially supported the multiple second central components 22, the multiple frames T7 that initially supported the multiple first horizontal components 51, and the multiple frames T5 that initially supported the multiple third horizontal components 53 continue to support the structure until the second transport process. In the second transport process, the single floating structure 1 is transported by the transport trolley D via these frames T2, T5, and T7. In other words, in the manufacturing method according to this embodiment, when manufacturing a single floating structure 1, the same frames T2, T5, and T7 support the multiple second central components 22, the multiple first horizontal components 51, and the multiple third horizontal components 53 that constitute the single floating structure 1 from start to finish.

[0061] As described above, the manufacturing method according to this embodiment includes a medium block manufacturing step in which, at the crane yard Y1, multiple central components 21 to 28, which are part of the floating structure 1 that supports the offshore wind turbine, are connected by a crane C to manufacture a central component 11, which is part of the floating structure 1, and multiple horizontal components 51 to 54 and end components 55 to 58, which are part of the floating structure 1, are connected by a crane C to manufacture a horizontal brace 12, which is part of the floating structure 1. Furthermore, the manufacturing method according to this embodiment includes a large block manufacturing step in which multiple central components 11 and horizontal braces 12, which are medium blocks, are connected at the integrated yard Y2 to manufacture the floating structure body 10, which is part of the floating structure 1. Furthermore, the manufacturing method according to this embodiment includes a first transport step in which multiple central components 11 and horizontal braces 12, which are medium blocks, manufactured in the medium block manufacturing step, are transported from the crane yard Y1 to the integrated yard Y2. Furthermore, in the manufacturing method according to this embodiment, the weight of at least one of the multiple central members 11 and horizontal braces 12, which are all central blocks and manufactured in the central block manufacturing step, exceeds the lifting capacity of the crane C provided by the crane equipment E, that is, the lifting capacity of two cranes C working together. Thus, in the manufacturing method according to this embodiment, at least one of the multiple central members 11 and horizontal braces 12, which are all central blocks and manufactured in the central block manufacturing step, is manufactured in the crane yard Y1 until it exceeds the lifting capacity of the crane C provided by the crane equipment E, that is, the lifting capacity of two cranes C working together. As a result, the manufacturing work, including connection work, in the integrated yard Y2 can be reduced. Consequently, the manufacturing efficiency of the floating structure 1 can be improved. That is, because the integrated yard Y2 requires a vast area that extends in all directions, it is not possible to secure a large space, and the manufacturing of large blocks becomes a bottleneck. Therefore, by completing as large a medium block as possible in the crane yard Y1, as in the manufacturing method according to this embodiment, the amount of work to be done in the integrated yard Y2, where much space cannot be secured, can be reduced, thereby improving manufacturing efficiency.Furthermore, if the weight of the central member 11 exceeds the lifting capacity of one crane C, it is possible to connect the remaining components to the central member 11 at the integrated yard Y2, even if it does not exceed the lifting capacity of two cranes C working together.

[0062] Furthermore, in the manufacturing method according to this embodiment, in the large block manufacturing step, multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, are connected by moving and raising / lowering them using a transport trolley D in the integrated yard Y2, thereby manufacturing the floating structure body 10. The weight of at least one of the multiple central members 11 and horizontal braces 12, all of which are medium blocks, exceeds the lifting capacity of the crane C equipped in the crane equipment E, that is, the lifting capacity of two cranes C lifting together. Therefore, it is difficult to connect all of the multiple central members 11 and horizontal braces 12, all of which are medium blocks, using the crane C equipped in the crane equipment E or a crawler crane (not shown). However, in the manufacturing method according to this embodiment, since a transport trolley D is used in the large block manufacturing step, it is possible to move and raise / lower these multiple central members 11 and horizontal braces 12, all of which are medium blocks, using the transport trolley D and connect them, thereby enabling the manufacturing of the floating structure body 10. Furthermore, this manufacturing method does not necessarily require the configuration in which, "in the large block manufacturing step, multiple central members 11 and horizontal braces 12, all of which are medium blocks manufactured in the medium block manufacturing step, are connected by moving and raising / lowering them using a transport trolley D in the integrated yard Y2 to manufacture the floating structure body 10."

[0063] Furthermore, in the manufacturing method according to this embodiment, during the large block manufacturing step, the transport trolley D raises and lowers multiple central members 11 and horizontal braces 12, all of which are medium blocks, manufactured during the medium block manufacturing step, via frames T2, T5, and T7. Also, in the manufacturing method according to this embodiment, during the large block manufacturing step, multiple central members 11 and horizontal braces 12, all of which are medium blocks, manufactured during the medium block manufacturing step, are connected while placed on frames T2, T5, and T7. Therefore, according to the manufacturing method according to this embodiment, frames T2, T5, and T7 can be used interchangeably for raising and lowering multiple central members 11 and horizontal braces 12, all of which are medium blocks, during the large block manufacturing step, and for connecting multiple central members 11 and horizontal braces 12, all of which are medium blocks. Furthermore, this manufacturing method does not necessarily require the configuration in which "in the large block manufacturing step, the transport trolley D raises and lowers multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, via frames T2, T5, and T7." Also, this manufacturing method does not necessarily require the configuration in which "in the large block manufacturing step, multiple central members 11 and horizontal braces 12, all of which are medium blocks and manufactured in the medium block manufacturing step, are connected while placed on frames T2, T5, and T7."

[0064] Furthermore, in the manufacturing method according to this embodiment, in the first transport step, multiple central members 11 and horizontal braces 12, all of which are central blocks and manufactured in the central block manufacturing step, are transported from the crane yard Y1 to the integration yard Y2 by a transport trolley D. The weight of at least one of the multiple central members 11 and horizontal braces 12, which are all central blocks, exceeds the lifting capacity of the crane C equipped in the crane equipment E, that is, the lifting capacity of two cranes C lifting together, and also exceeds the lifting capacity of a crawler crane (not shown) which is lower than the lifting capacity of the crane C equipped in the crane equipment E. Therefore, it is difficult to transport multiple central members 11 and horizontal braces 12, all of which are central blocks, by a crawler crane (not shown). However, in the manufacturing method according to this embodiment, since a transport trolley D is used, even multiple central members 11 and horizontal braces 12 can be transported from the crane yard Y1 to the integration yard Y2. Furthermore, the transport trolley D can be used for both raising and lowering multiple central members 11 and horizontal braces 12, all of which are middle blocks, and transporting multiple central members 11 and horizontal braces 12, all of which are middle blocks, from the crane yard Y1 to the integration yard Y2. It should be noted that this manufacturing method does not necessarily require the configuration in which, "in the first transport process, multiple central members 11 and horizontal braces 12, all of which are middle blocks, manufactured in the middle block manufacturing step, are transported from the crane yard Y1 to the integration yard Y2 by the transport trolley D."

[0065] Furthermore, the manufacturing method according to this embodiment further includes a second transport step in which the floating structure body 10 manufactured in the large block manufacturing step is transported from the integrated yard Y2 to the quay Q using a transport trolley D. The weight of the floating structure body 10 exceeds the lifting capacity of the crane C equipped in the crane equipment E, that is, the lifting capacity of the two cranes C lifting together, and also exceeds the lifting capacity of a crawler crane (not shown) which is lower than the lifting capacity of the crane C equipped in the crane equipment E, so it is difficult to transport the floating structure body 10 with a crawler crane (not shown). However, since the manufacturing method according to this embodiment uses a transport trolley D, even such a floating structure body 10 can be transported from the integrated yard Y2 to the quay Q and easily shipped from the quay Q. Note that this manufacturing method does not necessarily have to include a "second transport step in which the floating structure body 10 manufactured in the large block manufacturing step is transported from the integrated yard Y2 to the quay Q using a transport trolley D".

[0066] Furthermore, in the manufacturing method according to this embodiment, the weight of each of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 connected in the middle block manufacturing step is less than the lifting capacity of crane C. Therefore, according to the manufacturing method according to this embodiment, the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 can be reliably connected by crane C. Note that this manufacturing method does not necessarily require that "the weight of the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 connected in the middle block manufacturing step is less than the lifting capacity of crane C."

[0067] Furthermore, in the manufacturing method according to this embodiment, the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58, which are connected in the middle block manufacturing step, are all located within the slewing range of the crane C. Within this slewing range X, the lifting capacity of the crane C exceeds the weight of each of the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58, which are connected in the middle block manufacturing step. Therefore, according to the manufacturing method according to this embodiment, the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 can be reliably connected by the crane C. Furthermore, this manufacturing method does not require that "the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 connected in the middle block manufacturing step are located within the slewing range X of crane C." Also, this manufacturing method does not require that "the lifting capacity of crane C exceeds the weight of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 connected in the middle block manufacturing step, even if the lifting capacity of crane C is within this slewing range X."

[0068] Furthermore, in the manufacturing method according to this embodiment, in the middle block manufacturing step, the crane C may lift and connect the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 that are mounted on the ship, thereby manufacturing multiple central components 11 and horizontal braces 12, all of which are middle blocks. By doing so, the manufacturing method according to this embodiment saves temporary storage space for the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58, and even heavy small blocks that are mounted on a ship can be lifted and connected by the crane C. Furthermore, this manufacturing method does not necessarily require the configuration in which, "in the middle block manufacturing step, crane C lifts and connects the first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 that are mounted on the ship, thereby manufacturing multiple central components 11 and horizontal braces 12, all of which are middle blocks."

[0069] Furthermore, in the manufacturing method according to this embodiment, the crane C includes one crane C and another crane C, and in the middle block manufacturing step, a portion of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 are connected by one crane C, and another portion of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 are connected by another crane C. Therefore, according to the manufacturing method according to this embodiment, it is possible to manufacture multiple central components 11 and horizontal braces 12, all of which are middle blocks, in parallel. Furthermore, this manufacturing method does not necessarily require that, in the middle block manufacturing step, a portion of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 are connected by one crane C, and another portion of the multiple first to eighth central components 21 to 28, the first to fourth horizontal components 51 to 54, and the first to fourth end components 55 to 58 are connected by another crane C.

[0070] Furthermore, in the manufacturing method according to this embodiment, in the middle block manufacturing step, the central member 11 is manufactured by connecting a plurality of first members included in the first to eighth central component members 21 to 28 using one crane C, and the horizontal brace 12 is manufactured by connecting a plurality of second members included in the first to fourth horizontal component members 51 to 54 and the first to fourth end component members 55 to 58 using another crane C. Therefore, according to the manufacturing method according to this embodiment, multiple central members 11 and horizontal braces 12, all of which are middle blocks, can be manufactured in parallel in the crane yard Y1. Note that this manufacturing method does not necessarily have to be configured such that "in the middle block manufacturing step, the central member 11 is manufactured by connecting a plurality of first members included in the first to eighth central component members 21 to 28 using one crane C, and the horizontal brace 12 is manufactured by connecting a plurality of second members included in the first to fourth horizontal component members 51 to 54 and the first to fourth end component members 55 to 58 using another crane C."

[0071] Furthermore, in the manufacturing method according to this embodiment, the horizontal brace 12 may be lifted by a crawler crane different from crane C during the large block manufacturing step. With this configuration, the horizontal brace 12 can be lifted by a crawler crane different from crane C. Note that this manufacturing method does not necessarily have to be configured such that "the horizontal brace 12 is lifted by a crawler crane different from crane C during the large block manufacturing step."

[0072] Furthermore, in the manufacturing method according to this embodiment, the track R on which one crane C moves and the track R on which another crane C moves are the same. Therefore, according to the manufacturing method according to this embodiment, it is possible to suppress an increase in the cost of the crane equipment E. Note that this manufacturing method does not necessarily have to be configured such that "the track R on which one crane C moves and the track R on which another crane C moves are the same."

[0073] Furthermore, in the manufacturing method according to this embodiment, the height of each of the multiple central members 11 and horizontal braces 12, all of which are central blocks and manufactured in the central block manufacturing step, is less than the lifting height of the crane C. Therefore, according to the manufacturing method according to this embodiment, the multiple central members 11 and horizontal braces 12, all of which are central blocks, can be manufactured more reliably using the crane C. Note that this manufacturing method does not necessarily have to be configured such that "the height of the multiple central members 11 and horizontal braces 12, all of which are central blocks and manufactured in the central block manufacturing step, is less than the lifting height of the crane C."

[0074] Furthermore, in the manufacturing method according to this embodiment, in the large block manufacturing step, one central member 11 and one horizontal brace 12 are connected in one integrated yard Y2 to manufacture one floating structure body 10 which is part of the floating structure 1, and another central member 11 and another horizontal brace 12 are connected in another integrated yard Y2 to manufacture another floating structure body 10 which is part of the floating structure 1. Thus, according to the manufacturing method according to this embodiment, the floating structure body 10 can be manufactured in multiple integrated yards Y2. Furthermore, this manufacturing method does not necessarily require the configuration of "in the large block manufacturing step, in one integrated yard Y2, one central member 11 and one horizontal brace 12 are connected to manufacture one floating structure body 10 which is part of the floating structure 1, and in another integrated yard Y2, another central member 11 and another horizontal brace 12 are connected to manufacture another floating structure body 10 which is part of the floating structure 1."

[0075] Furthermore, in the manufacturing method according to this embodiment, in the first transport step, the same transport trolley D transports one central member 11 and one horizontal brace 12 manufactured in the middle block manufacturing step from the crane yard Y1 to the integration yard Y2, and transports another central member 11 and another horizontal brace 12 manufactured in the middle block manufacturing step from the crane yard Y1 to the other integration yard Y2. Therefore, according to the manufacturing method according to this embodiment, the transport trolley D that transports one central member 11 and one horizontal brace 12 from the crane yard Y1 to the integration yard Y2 can be used interchangeably with the transport trolley D that transports another central member 11 and another horizontal brace 12 from the crane yard Y1 to the other integration yard Y2. Furthermore, this manufacturing method does not necessarily require the configuration in which, "in the first transport process, one central member 11 and one horizontal brace 12 manufactured in the middle block manufacturing step are transported from the crane yard Y1 to the integration yard Y2 using the same transport trolley D, and another central member 11 and another horizontal brace 12 manufactured in the middle block manufacturing step are transported from the crane yard Y1 to another integration yard Y2."

[0076] Furthermore, in the manufacturing method according to this embodiment, in the first transport step, one central member 11 and one horizontal brace 12 manufactured in the middle block manufacturing step may be transported to one integrated yard Y2 using separate transport trolleys D, and another central member 11 and another horizontal brace 12 manufactured in the middle block manufacturing step may be transported to another integrated yard Y2. According to the manufacturing method according to this embodiment, by configuring it in this way, the transport of one central member 11 and one horizontal brace 12 from the crane yard Y1 to one integrated yard Y2 and the transport of another central member 11 and another horizontal brace 12 from the crane yard Y1 to another integrated yard Y2 can be performed in parallel. Furthermore, this manufacturing method does not necessarily require the configuration in which, "in the first transport process, one central member 11 and one horizontal brace 12 manufactured in the middle block manufacturing step are transported to one integrated yard Y2 using separate transport trolleys D, and another central member 11 and another horizontal brace 12 manufactured in the middle block manufacturing step are transported to another integrated yard Y2."

[0077] Furthermore, in the manufacturing method according to this embodiment, one floating structure body 10 manufactured in the large block manufacturing step undergoes one of the following: assembly, welding, painting, and attachment of accessories, while another floating structure body 10 manufactured in the large block manufacturing step undergoes one of the following: assembly, welding, painting, and attachment of accessories. Therefore, according to the manufacturing method according to this embodiment, the floating structure body 10 can be manufactured efficiently even with a small amount of equipment (for example, transport trolley D). Note that this manufacturing method does not necessarily have to be configured such that "one floating structure body 10 manufactured in the large block manufacturing step undergoes one of the following: assembly, welding, painting, and attachment of accessories, while another floating structure body 10 manufactured in the large block manufacturing step undergoes one of the following: assembly, welding, painting, and attachment of accessories."

[0078] Furthermore, in the manufacturing method according to this embodiment, crane C is a jib crane. With this configuration, it is easy to enlarge the work area by using a jib crane as crane C, which has a large working radius and can move along a track. Therefore, it becomes easier to secure a work area and enlarge the work area. Note that this manufacturing method does not necessarily require that "crane C is a jib crane".

[0079] Furthermore, in the manufacturing method according to this embodiment, the integrated yard Y2 is further from the quay Q than the crane yard Y1. Therefore, according to the manufacturing method according to this embodiment, the space of the pier W can be effectively utilized. Note that this manufacturing method does not necessarily require the configuration in which "the integrated yard Y2 is further from the quay Q than the crane yard Y1".

[0080] The technical scope of this disclosure is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of this disclosure.

[0081] For example, in this embodiment, the floating structure body 10 has first to eighth central components 21 to 28, first to fourth horizontal components 51 to 54, and first to fourth end components 55 to 58 which are formed from members with a circular cross-section (for example, pipes). However, the floating structure body 10 may also be formed from members with a rectangular cross-section or members with a polygonal cross-section, or from an appropriate combination of members with a circular cross-section, a rectangular cross-section, and members with a polygonal cross-section.

[0082] 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.

[0083] (Note) The manufacturing method according to the above embodiment can be understood, for example, as follows.

[0084] (1) A manufacturing method according to one aspect of the present disclosure comprises: a medium block manufacturing step of manufacturing multiple medium blocks which are part of a floating structure that supports an offshore wind turbine, by connecting multiple small blocks which are part of the structure with a crane in a crane yard; and a large block manufacturing step of manufacturing a large block which is part of the structure, by connecting multiple medium blocks in an integrated yard, wherein the manufacturing method further comprises a first transport step of transporting the multiple medium blocks manufactured in the medium block manufacturing step from the crane yard to the integrated yard, and the weight of at least one of the multiple medium blocks manufactured in the medium block manufacturing step exceeds the lifting capacity of the crane.

[0085] This manufacturing method allows for the reduction of manufacturing work, including connection work, in the integration yard by manufacturing at least one of the multiple intermediate blocks produced in the intermediate block manufacturing step in the crane yard until it exceeds the crane's lifting capacity. As a result, the production efficiency of floating structures can be improved.

[0086] (2) In the manufacturing method described in (1) above, the large block manufacturing step may also be configured such that a plurality of the medium blocks manufactured in the medium block manufacturing step are connected by moving and raising / lowering them on a transport trolley in the integrated yard to manufacture the large block.

[0087] With this configuration, since a transport trolley is used in the large block manufacturing step, even if the weight of at least one of the multiple medium blocks exceeds the lifting capacity of the crawler crane, the medium blocks can be moved and lifted using the transport trolley and connected, making it possible to manufacture the large block.

[0088] (3) In the manufacturing method described in (2) above, in the large block manufacturing step, the transport trolley may raise and lower the multiple medium blocks manufactured in the medium block manufacturing step via a frame, and in the large block manufacturing step, the multiple medium blocks manufactured in the medium block manufacturing step may be connected while placed on the frame.

[0089] With this configuration, the frame for raising and lowering multiple medium blocks and the frame for connecting multiple medium blocks can be used interchangeably during the large block construction step.

[0090] (4) In the manufacturing method relating to any one of (1) to (3) above, the intermediate blocks which are manufactured in multiples in the intermediate block manufacturing step may be transported by a transport trolley from the crane yard to the integration yard.

[0091] With this configuration, since a transport trolley is used, even if the weight of at least one of the multiple intermediate blocks exceeds the lifting capacity of the crawler crane, the intermediate blocks can be transported from the crane yard to the integrated yard. Furthermore, the transport trolley can be used for both raising and lowering multiple intermediate blocks and transporting multiple intermediate blocks from the crane yard to the integrated yard.

[0092] (5) In any one of the above (1) to (4) manufacturing methods, the configuration may further include a second transport step in which the large block manufactured in the large block manufacturing step is transported from the integrated yard to the quay using a transport trolley.

[0093] With this configuration, since a transport trolley is used, even if the weight of the large block exceeds the lifting capacity of the crawler crane, the large block can be transported from the integrated yard to the quay and easily shipped from the quay.

[0094] (6) In the manufacturing method relating to any one of (1) to (5) above, the weight of each of the multiple small blocks connected in the medium block manufacturing step may be less than the lifting capacity.

[0095] With this configuration, the small blocks can be securely connected using a crane.

[0096] (7) In the manufacturing method relating to any one of (1) to (6) above, each of the multiple small blocks connected in the middle block manufacturing step is located within the rotational range of the crane, and the lifting capacity of the crane is greater than the weight of each of the multiple small blocks connected in the middle block manufacturing step, provided they are within the rotational range.

[0097] With this configuration, the small blocks can be securely connected using a crane.

[0098] (8) In the manufacturing method relating to any one of (1) to (7) above, in the middle block manufacturing step, the crane may be configured to lift and connect the small blocks mounted on the ship to manufacture the middle block.

[0099] This configuration saves space for manufacturing and temporarily storing small blocks, and even heavy blocks, such as those used on ships, can be lifted and connected using a crane.

[0100] (9) In the manufacturing method relating to any one of (1) to (8) above, the crane may include a first crane and a second crane, and in the medium block manufacturing step, a portion of the plurality of small blocks may be connected by the first crane, and another portion of the plurality of small blocks may be connected by the second crane.

[0101] This configuration makes it possible to manufacture multiple intermediate blocks in parallel.

[0102] (10) In the manufacturing method described in (9) above, the medium block includes a central member and a horizontal brace, and the plurality of small blocks include a plurality of first members and a plurality of second members, and in the medium block manufacturing step, the central member and the horizontal brace are manufactured, the central member is manufactured by connecting the plurality of first members included in the plurality of small blocks using the first crane, and the horizontal brace is manufactured by connecting the plurality of second members included in the plurality of small blocks using the second crane.

[0103] With this configuration, the central members and horizontal braces can be manufactured in parallel in the crane yard.

[0104] (11) In the manufacturing method described in (10) above, the horizontal brace may be lifted by a crawler crane different from the crane in the large block manufacturing step.

[0105] With this configuration, the horizontal brace can be lifted by a crawler crane, which is different from a regular crane.

[0106] (12) In the manufacturing methods described in (9) to (11) above, the trajectory on which the first crane moves and the trajectory on which the second crane moves may be the same.

[0107] This configuration helps to suppress increases in equipment costs.

[0108] (13) In the manufacturing method relating to any one of (1) to (12) above, the height of each of the multiple intermediate blocks manufactured in the intermediate block manufacturing step may be less than the lifting height of the crane.

[0109] This configuration allows for the more reliable production of multiple intermediate blocks using a crane.

[0110] (14) In the manufacturing method relating to any one of (1) to (13) above, the integrated yard may include a first integrated yard and a second integrated yard, the plurality of intermediate blocks may include a plurality of first intermediate blocks and a plurality of second intermediate blocks, the large block may include a first large block and a second large block, and in the large block manufacturing step, the plurality of first intermediate blocks may be connected in the first integrated yard to manufacture a first large block which is a part of the large block, and the plurality of second intermediate blocks may be connected in the second integrated yard to manufacture a second large block which is a part of the large block.

[0111] With this configuration, large blocks can be manufactured in multiple integrated yards.

[0112] (15) In the manufacturing method described in (14) above, the first transport step may be configured such that, using the same transport trolley, a plurality of the first intermediate blocks manufactured in the intermediate block manufacturing step are transported from the crane yard to the first integration yard, and a plurality of the second intermediate blocks manufactured in the intermediate block manufacturing step are transported from the crane yard to the second integration yard.

[0113] With this configuration, the transport cart used to transport multiple first intermediate blocks from the crane yard to the first integrated yard can be used for both transporting and transporting multiple second intermediate blocks from the crane yard to the second integrated yard.

[0114] (16) In the manufacturing method according to (14) above, the first transport step may be configured such that a plurality of first intermediate blocks manufactured in the intermediate block manufacturing step are transported to the first integrated yard using separate transport trolleys, and a plurality of second intermediate blocks manufactured in the intermediate block manufacturing step are transported to the second integrated yard.

[0115] With this configuration, it is possible to transport multiple first intermediate blocks from the crane yard to the first integration yard and multiple second intermediate blocks from the crane yard to the second integration yard in parallel.

[0116] (17) In the manufacturing method relating to any one of (14) to (16) above, the first large block manufactured in the large block manufacturing step may be configured such that one of the following is performed: assembly, welding, painting, and attachment of accessories, and the second large block manufactured in the large block manufacturing step may be configured such that one of the following is performed: assembly, welding, painting, and attachment of accessories.

[0117] With this configuration, the first block can be manufactured efficiently even with limited equipment (for example, with fewer transport carts).

[0118] (18) In the manufacturing method relating to any one of (1) to (17) above, the crane may be a jib crane.

[0119] With this configuration, it is easy to enlarge the work area by using a jib crane, which has a large working radius and can move along a track, as the crane.

[0120] (19) In the manufacturing method relating to any one of (1) to (18) above, the integrated yard may be configured to be further from the quay than the crane yard.

[0121] This configuration allows for effective use of the space on the pier. [Explanation of Symbols]

[0122] 10. Main body of the floating structure 11. Central component (middle block) 12 Horizontal braces (middle blocks) 21-28 Central components (small blocks) 1st to 8th 51-54 1st-4th horizontal structural members (small blocks) 55-58 1st-4th end-side components (small blocks) C Crane D Transport cart Q Wharf R orbit T1-T7 mounting base X Swivel range Y1 Crane Yard Y2 Integrated Yard

Claims

1. In the crane yard, multiple small blocks, which are part of the floating structure that supports the offshore wind turbine, are connected by a crane, and multiple medium blocks, which are part of the aforementioned structure, are manufactured in the medium block manufacturing step. In an integrated yard, a large block manufacturing step is performed in which multiple medium blocks are connected to produce a large block which is a part of the aforementioned, A manufacturing method that provides, A first transport step involves transporting the multiple intermediate blocks produced in the intermediate block manufacturing step from the crane yard to the integration yard. Furthermore, The intermediate block produced in the intermediate block production step is made of steel. The weight of at least one of the steel middle blocks produced in the middle block manufacturing step exceeds the lifting capacity of the crane. A manufacturing method characterized by the above.

2. In the crane yard, multiple small blocks, which are part of the floating structure that supports the offshore wind turbine, are connected by a crane, and multiple medium blocks, which are part of the aforementioned structure, are manufactured in the medium block manufacturing step. In an integrated yard, a large block manufacturing step is performed in which multiple medium blocks are connected to produce a large block which is a part of the aforementioned, A manufacturing method that provides, A first transport step involves transporting the multiple intermediate blocks produced in the intermediate block manufacturing step from the crane yard to the integration yard. Furthermore, The weight of at least one of the multiple intermediate blocks produced in the intermediate block production step exceeds the lifting capacity of the crane. In the large block manufacturing step, the multiple medium blocks manufactured in the medium block manufacturing step are aligned and connected in the integrated yard by raising and lowering them on a transport trolley, thereby manufacturing the large block. The aforementioned crane includes a first crane and a second crane, In the aforementioned medium block manufacturing step, a portion of the multiple small blocks is connected by the first crane, and another portion of the multiple small blocks is connected by the second crane. The aforementioned middle block includes a central member and a horizontal brace, The plurality of small blocks include a plurality of first members and a plurality of second members, In the aforementioned middle block manufacturing step, the central member is manufactured, and the horizontal brace is manufactured. The central member is manufactured by connecting multiple first members included in multiple small blocks using the first crane. The horizontal brace is manufactured by connecting multiple second members included in multiple small blocks using the second crane. A manufacturing method characterized by the above.

3. In the crane yard, multiple small blocks, which are part of the floating structure that supports the offshore wind turbine, are connected by a crane, and multiple medium blocks, which are part of the aforementioned structure, are manufactured in the medium block manufacturing step. In an integrated yard, a large block manufacturing step is performed in which multiple medium blocks are connected to produce a large block which is a part of the aforementioned, A manufacturing method that provides, A first transport step involves transporting the multiple intermediate blocks produced in the intermediate block manufacturing step from the crane yard to the integration yard. Furthermore, The weight of at least one of the multiple intermediate blocks produced in the intermediate block production step exceeds the lifting capacity of the crane. In the large block manufacturing step, the multiple medium blocks manufactured in the medium block manufacturing step are aligned and connected in the integrated yard by raising and lowering them on a transport trolley, thereby manufacturing the large block. The aforementioned integrated yard includes the first integrated yard and the second integrated yard. The plurality of intermediate blocks include a plurality of first intermediate blocks and a plurality of second intermediate blocks, The aforementioned large block includes the first large block and the second large block, In the large block manufacturing step, a plurality of the first medium blocks are connected in the first integrated yard to manufacture a first large block which is a part of the first large block, and a plurality of the second medium blocks are connected in the second integrated yard to manufacture a second large block which is a part of the first large block. The first large block produced in the large block production step is subjected to one of the following: assembly, welding, painting, and attachment of accessories, and the second large block produced in the large block production step is subjected to one of the following: assembly, welding, painting, and attachment of accessories. A manufacturing method characterized by the above.

4. In the crane yard, multiple small blocks, which are part of the floating structure that supports the offshore wind turbine, are connected by a crane, and multiple medium blocks, which are part of the aforementioned structure, are manufactured in the medium block manufacturing step. In an integrated yard, a large block manufacturing step is performed in which multiple medium blocks are connected to produce a large block which is a part of the aforementioned, A manufacturing method that provides, A first transport step involves transporting the multiple intermediate blocks produced in the intermediate block manufacturing step from the crane yard to the integration yard. Furthermore, The weight of at least one of the multiple intermediate blocks produced in the intermediate block production step exceeds the lifting capacity of the crane. In the large block manufacturing step, the multiple medium blocks manufactured in the medium block manufacturing step are aligned and connected in the integrated yard by raising and lowering them on a transport trolley, thereby manufacturing the large block. The aforementioned integrated yard is further from the quay than the aforementioned crane yard. A manufacturing method characterized by the above.

5. In the large block manufacturing step, the multiple medium blocks manufactured in the medium block manufacturing step are connected by raising and lowering them on a transport trolley in the integrated yard, thereby manufacturing the large block. The manufacturing method according to feature 1.

6. In the large block manufacturing step, the transport trolley raises and lowers the multiple medium blocks manufactured in the medium block manufacturing step via a frame. In the large block manufacturing step, the multiple medium blocks manufactured in the medium block manufacturing step are connected while placed on the frame. The manufacturing method according to any one of claims 2 to 5.

7. In the first transport process, the multiple intermediate blocks manufactured in the intermediate block manufacturing step are transported by the transport trolley from the crane yard to the integration yard. The manufacturing method according to any one of claims 2 to 5.

8. A second transport step involves transporting the large block manufactured in the aforementioned large block manufacturing step from the integrated yard to the quay using the transport trolley. The manufacturing method according to any one of claims 2 to 5, further comprising the above.

9. The weight of each of the multiple small blocks connected in the aforementioned medium block manufacturing step is less than the lifting capacity. The manufacturing method according to any one of claims 1 to 5.

10. Each of the multiple small blocks connected in the aforementioned medium block manufacturing step is located within the rotational range of the crane. The lifting capacity of the crane, within its slewing range, exceeds the weight of each of the multiple small blocks connected in the medium block manufacturing step. The manufacturing method according to feature 9.

11. In the aforementioned intermediate block manufacturing step, the crane lifts and connects the small blocks mounted on the ship to manufacture the intermediate block. The manufacturing method according to feature 9.

12. The aforementioned crane includes a first crane and a second crane, In the aforementioned medium block manufacturing step, a portion of the multiple small blocks is connected by the first crane, and another portion of the multiple small blocks is connected by the second crane. The manufacturing method according to any one of claims 1, 3 to 5.

13. The aforementioned middle block includes a central member and a horizontal brace, The plurality of small blocks include a plurality of first members and a plurality of second members, In the aforementioned middle block manufacturing step, the central member is manufactured, and the horizontal brace is manufactured. The central member is manufactured by connecting multiple first members included in multiple small blocks using the first crane. The horizontal brace is manufactured by connecting multiple second members included in multiple small blocks using the second crane. The manufacturing method according to feature 12.

14. In the aforementioned large block manufacturing step, the horizontal brace is lifted by a crawler crane different from the aforementioned crane. The manufacturing method according to feature 2.

15. In the aforementioned large block manufacturing step, the horizontal brace is lifted by a crawler crane different from the aforementioned crane. The manufacturing method according to feature 13.

16. The trajectory along which the first crane moves and the trajectory along which the second crane moves are the same. The manufacturing method according to feature 2.

17. The trajectory along which the first crane moves and the trajectory along which the second crane moves are the same. The manufacturing method according to feature 12.

18. The height of each of the multiple intermediate blocks produced in the intermediate block production step is less than the lifting height of the crane. The manufacturing method according to any one of claims 1 to 5, 14, or 16.

19. The aforementioned integrated yard includes the first integrated yard and the second integrated yard. The plurality of intermediate blocks include a plurality of first intermediate blocks and a plurality of second intermediate blocks, The aforementioned large block includes the first large block and the second large block, In the large block manufacturing step, a plurality of the first medium blocks are connected in the first integrated yard to manufacture a first large block which is a part of the first large block, and a plurality of the second medium blocks are connected in the second integrated yard to manufacture a second large block which is a part of the first large block. The manufacturing method according to any one of claims 1, 2, 4, 5, 14, or 16.

20. In the first transport process, the same transport trolley is used to transport a plurality of the first intermediate blocks manufactured in the intermediate block manufacturing step from the crane yard to the first integration yard, and to transport a plurality of the second intermediate blocks manufactured in the intermediate block manufacturing step from the crane yard to the second integration yard. The manufacturing method according to feature 3.

21. In the first transport process, the same transport trolley is used to transport a plurality of the first intermediate blocks manufactured in the intermediate block manufacturing step from the crane yard to the first integration yard, and to transport a plurality of the second intermediate blocks manufactured in the intermediate block manufacturing step from the crane yard to the second integration yard. The manufacturing method according to feature 19.

22. In the first transport process, multiple first intermediate blocks manufactured in the intermediate block manufacturing step are transported to the first integration yard using separate transport trolleys, and multiple second intermediate blocks manufactured in the intermediate block manufacturing step are transported to the second integration yard. The manufacturing method according to feature 3.

23. In the first transport process, multiple first intermediate blocks manufactured in the intermediate block manufacturing step are transported to the first integration yard using separate transport trolleys, and multiple second intermediate blocks manufactured in the intermediate block manufacturing step are transported to the second integration yard. The manufacturing method according to feature 19.

24. The first large block produced in the large block production step is subjected to one of the following: assembly, welding, painting, and attachment of accessories, and the second large block produced in the large block production step is subjected to one of the following: assembly, welding, painting, and attachment of accessories. The manufacturing method according to feature 19.

25. The aforementioned crane is a jib crane. The manufacturing method according to any one of claims 1 to 5, 14, 16, 20, or 22.

26. The aforementioned integrated yard is further from the quay than the aforementioned crane yard. The manufacturing method according to any one of claims 1 to 3, 5, 14, 16, 20, or 22.

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