Installation stand system, movement method and system

Abstract

To provide an installation stand system, a movement method and a system that can reduce the weight of an installation stand for a yard. [Solution] An installation base system 100 on which an offshore structure 10 is installed includes a yard installation base S1 on which the offshore structure 10 is installed and placed in yard Y, and a shipboard installation base on which the offshore structure 10 is installed and placed on ship B, where the yard installation base S1 is made of steel, and the offshore structure 10 includes a bottom-mounted foundation or jacket-type structure that supports an offshore wind turbine.

Description

[Technical Field]

[0001] The present disclosure relates to a mounting table system, a movement method and a system. [Background technology]

[0002] Traditionally, grillages are used to distribute the weight of marine structures (jackets, spars, etc.) on, for example, offshore wind turbines or offshore oil platforms, over a larger area of ​​the supporting structure or ground. Patent Document 1 discloses a grillage that is placed on the deck of a ship to correspond to the spacing and configuration of the legs of the heavy load. Patent Document 1 also discloses that steel is used for the grillage. Patent Document 1 also discloses that the legs of the jacket rest on concrete supports on the ground in the yard. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2020 / 0056740 Summary of the Invention [Problem to be solved by the invention]

[0004] However, Patent Document 1 merely discloses a concrete support portion to be used in a yard. There is room for improvement in reducing the weight of the installation base for the yard.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide an installation platform system, a movement method, and a system that can reduce the weight of an installation platform for a yard. [Means for solving the problem]

[0006] <1> The installation stand system according to the first aspect of the present disclosure includes: An installation stand system on which an offshore structure is installed, a yard installation base on which the marine structure is installed and which is placed in a yard; a shipboard installation base on which the marine structure is installed and which is placed on a ship; Including, The yard installation base is made of steel, The offshore structure includes a bottom-mounted foundation or a jacket-type structure that supports an offshore wind turbine. It is characterized by: [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an installation platform system, a movement method, and a system that can reduce the weight of an installation platform for a yard. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of an offshore wind turbine jacket structure system including an installation base system according to a first embodiment, showing the state in which the jacket structure system is in a yard. FIG. [Figure 2] FIG. 2 is an enlarged view of part II shown in FIG. [Figure 3] FIG. 10 is a first side view showing a state in which the leg is placed on the first placement table. [Figure 4] FIG. 10 is a second side view showing the state in which the leg is placed on the first placement table. [Figure 5] FIG. 5 is an enlarged view of a portion V in FIG. [Figure 6] FIG. 5 is a plan view of FIG. [Figure 7] FIG. 10 is a front view showing a state in which the leg is sandwiched between the first transporting carriage and the second transporting carriage. [Figure 8] FIG. 8 is a plan view of FIG. [Figure 9] 1 is a perspective view of an offshore wind turbine jacket structure system including an installation base system according to a first embodiment, showing the state where the jacket structure system is installed on a ship. FIG. [Figure 10] FIG. 10 is a plan view showing an example of the placement position of the first placement stage on the ship. [Figure 11]FIG. 10 is a front view showing a first installation stand used in the installation stand system according to the second embodiment. [Figure 12] FIG. 10 is a perspective view showing a first installation stand used in the installation stand system according to the second embodiment. [Figure 13] FIG. 10 is a plan view schematically showing a first installation stand used in the installation stand system according to the third embodiment. [Figure 14] FIG. 10 is a side view schematically showing an installation stand system and a jacket-type structure according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] Hereinafter, an offshore wind turbine jacket structure system including an installation stand system and a movement method according to a first embodiment of the present disclosure will be described with reference to the drawings. The offshore wind turbine jacket structure system comprises an offshore wind turbine jacket structure having a plurality of legs. The offshore wind turbine jacket structure is one type of bottom-fixed foundation that supports an offshore wind turbine. In addition to the offshore wind turbine jacket structure, the bottom-fixed foundation that supports an offshore wind turbine also includes, for example, an offshore wind turbine monopile foundation, which will be described later. In the first embodiment, the offshore wind turbine jacket structure provided in the offshore wind turbine jacket structure system may be in a completed state or may be in the process of being manufactured. The offshore wind turbine jacket structure system comprises, for example, one or more offshore wind turbine jacket structures. The offshore wind turbine jacket structure is installed offshore by being connected to steel pipe piles driven into the seabed. The offshore wind turbine jacket structure supports an offshore wind turbine (not shown) offshore. In addition, when the offshore wind turbine jacket structure system includes multiple offshore wind turbine jacket structures, the structures or shapes of the multiple offshore wind turbine jacket structures may all be the same or may be different from each other.

[0010] Hereinafter, the configuration of an offshore wind turbine jacket structure 10, which is one of the offshore wind turbine jacket structures included in an offshore wind turbine jacket structure system 1 including an installation stand system 100 according to the first embodiment, will be described. FIG. 1 is a perspective view of an offshore wind turbine jacket structure system 1 including an installation stand system 100 according to the first embodiment, showing the state in which the system is located in a yard Y. FIG. 2 is an enlarged view of part II shown in FIG. FIG. 3 is a first side view showing a state in which the leg 11 is placed on the first placement stand S1. FIG. 4 is a second side view showing the state in which the leg 11 is placed on the first placement stand S1. FIG. 5 is an enlarged view of part V in FIG. FIG. 6 is a plan view of FIG. FIG. 7 is a front view showing the leg 11 sandwiched between the first transporting carriage D1 and the second transporting carriage D2. FIG. 8 is a plan view of FIG. FIG. 9 is a perspective view of the offshore wind turbine jacket structure system 1 including the installation stand system 100 according to the first embodiment, showing the state where it is located on the ship B. FIG. 10 is a plan view showing an example of the placement position of the first placement stand S1 on the ship B. As shown in FIG.

[0011] (Configuration of jacket structure 10 for offshore wind turbine) As shown in FIG. 1 , an offshore wind turbine jacket structure 10, which is an offshore structure, includes legs 11 (foundations) that serve as its foundations, braces 12, and transition pieces 13. Here, the foundation refers to the portion that is installed (supported) on an installation base (described later). In the case of the offshore wind turbine jacket structure 10, the foundation may be legs (e.g., lower parts of legs), transition pieces (described later), braces, or reinforcing members provided solely for transporting the offshore wind turbine jacket structure 10. In the case of a monopile foundation for an offshore wind turbine (described later), the foundation may be the lower end or outer peripheral surface thereof. In the case of a jacket-type structure 410 (described later), the foundation may be legs (e.g., lower parts of legs), braces, or reinforcing members provided solely for transporting the jacket-type structure 410. The leg 11 is a leg included in the jacket structure 10 for an offshore wind turbine. The leg 11 extends in the vertical direction. In the first embodiment, the leg 11 is a cylindrical member. In other words, the leg 11 is a hollow member. The lower part of the leg 11 is connected to the upper end of a steel pipe pile (not shown). The upper end of the leg 11 is connected to a transition piece 13. At this time, the leg 11 may be bent or curved as appropriate to match the dimensions of the transition piece 13 connected to the upper end and the spacing between the steel pipe piles connected to the lower ends. In the first embodiment, the jacket structure 10 for an offshore wind turbine includes a plurality of legs 11. Specifically, the jacket structure 10 for an offshore wind turbine has four legs 11.

[0012] In the first embodiment, the leg 11 and the steel pipe pile are connected, for example, by inserting the lower part of the leg 11 into the steel pipe pile from the upper end of the steel pipe pile. After the connection, the leg 11 and the steel pipe pile are fixed, for example, by filling grout between the outer peripheral surface of the leg 11 and the inner peripheral surface of the steel pipe pile. Here, if grout flows into the inside of the leg 11, it will cause an excess amount of grout to be required to fix the leg 11 and the steel pipe pile. To prevent this, a cover member 11C (see FIG. 3) is provided at the bottom of the leg 11 to close the opening of the cylindrical leg 11 and prevent grout from flowing into the inside of the leg 11. This reduces the amount of grout required to secure the leg 11 and the steel pipe pile. Note that the cover member 11C is not necessary, and the connection between the steel pipe pile and the leg 11 is not limited to this.

[0013] In the first embodiment, the diameter of the cover member 11C is larger than the diameter of the lower part of the leg 11. As a result, the cover member 11C forms a flange-shaped portion at the lower part of the leg 11. Hereinafter, this portion will be referred to as the flange portion 11f. The flange portion 11f is engaged with the claw portion S1c of the first installation stand S1 constituting the installation stand system 100, which will be described later. This makes it possible to prevent the leg 11 from floating up from the first installation stand S1.

[0014] When inserting the leg 11 into the steel pipe pile or when installing the lower part of the leg 11 on the first installation stand S1, it is necessary to properly align the lower end of the leg 11. To facilitate this alignment, a cross-shaped member 11G is provided at the lower end of the leg 11. The cross-shaped member 11G functions as a guide that guides the lower end of the leg 11 to the upper end of the steel pipe pile or to a hole S1h (see FIG. 6) in the first installation stand S1, which will be described later. The cross-shaped member 11G is formed in a cross shape when viewed along the axial direction of the lower end of the leg 11. The cross-shaped member 11G is formed, for example, by combining and arranging multiple plate-shaped members in a cross shape. Note that a member of a shape other than a cross may be used instead of the cross-shaped member 11G.

[0015] 3 and 4, the cross-shaped member 11G is preferably shaped to have an apex 11Gt that protrudes downward at the center in the radial direction of the leg 11. With this, for example, when aligning the leg 11 with the steel pipe pile, after the apex 11Gt of the cross-shaped member 11G is inserted into the steel pipe pile, the cross-shaped member 11G continues to abut against the steel pipe pile as the leg 11 moves downward, so that the central axis of the leg 11 can be guided to approximately coincide with the central axis of the steel pipe pile. In order to provide a vertex 11Gt to the cross-shaped member 11G, each of the plate-like members forming the cross-shaped member 11G is preferably trapezoidal or triangular, for example. Furthermore, in order to facilitate the alignment of the legs 11 and the steel pipe pile or the first installation base S1 using the cross-shaped member 11G, it is preferable that the dimension of the cross-shaped member 11G in a direction perpendicular to the axial direction of the lower end of the legs 11 is approximately the same as the diameter of the cover member 11C, for example. Alternatively, the dimension of the cross-shaped member 11G in a direction perpendicular to the axial direction of the lower end of the legs 11 may be larger than the diameter of the cover member 11C, as shown in FIG. 6, as long as the cross-shaped member 11G can be accommodated inside the steel pipe pile. The cross-shaped member 11G may also be omitted.

[0016] The braces 12 connect the four legs 11 to one another along the circumferential direction of the jacket structure 10 for an offshore wind turbine. The braces 12 are joined to the legs 11 by, for example, welding. In this way, the braces 12 reinforce the structure made up of the four legs 11. Note that the number of legs 11 in the jacket structure 10 for an offshore wind turbine is not limited to four. If the number of legs is more than four, the braces will only directly connect to adjacent legs. The transition piece 13 is the part of the offshore wind turbine jacket structure 10 to which the offshore wind turbine is connected. Specifically, the lower end of the offshore wind turbine tower is connected to the transition piece 13. The transition piece 13 is also supported by the four legs mentioned above. With the above-mentioned configurations, the jacket structure 10 for an offshore wind turbine supports the offshore wind turbine.

[0017] (Manufacturing and transporting the jacket structure for offshore wind turbines) The offshore wind turbine jacket structure 10 according to the first embodiment is manufactured by assembling the above-mentioned components in an onshore yard (factory), and then transported to an offshore installation site. It is then installed offshore by connecting to steel pipe piles that have been driven into the seabed in advance. The offshore wind turbine jacket structure 10 is also transported over land by a transport vehicle D, as shown in FIGS. 1 and 2, in accordance with each process during manufacturing. Note that instead of connecting the offshore wind turbine jacket structure 10 to steel pipe piles that have been driven into the seabed in advance, there is also the case where the offshore wind turbine jacket structure 10 is installed before the steel pipe piles are driven, and the steel pipe piles are then driven into the seabed later so as to be connected to the offshore wind turbine jacket structure 10 installed in this way.

[0018] Hereinafter, the manner in which the jacket structure 10 for an offshore wind turbine according to the first embodiment is manufactured and transported will be described. That is, for example, when fabricating the offshore wind turbine jacket structure 10, each of the multiple legs 11 is installed on a first installation stage S1 that constitutes the installation stage system 100 according to the first embodiment, as shown in Fig. 3 or 4. The offshore wind turbine jacket structure 10 being fabricated is transported by moving the first installation stage S1, on which the legs 11 are installed, by a transport vehicle D, as shown in Figs. 1 and 2. At this time, the first installation stage S1 and the transport vehicle D are connected by a horizontal member H (see Fig. 7). This makes it possible to move the first installation stage S1 and the legs 11 by the transport vehicle D.

[0019] (1st installation stand) For example, as shown in FIG. 3 or 4, the first installation stand S1 includes a first leg portion S1a, a first beam portion S1b, a claw portion S1c, and a contact member S1d. The first leg S1a is the portion that comes into contact with the ground. The first leg S1a extends, for example, horizontally along the ground. At this time, the first leg S1a extends, for example, along the traveling direction of the offshore wind turbine jacket structure 10 when it is transported. This allows the transport vehicle D to be positioned along the longitudinal direction of the first leg S1a. The first leg S1a is made of, for example, a known shaped steel such as an H-beam or I-beam. In this case, the first leg S1a is arranged, for example, so that the web portion is perpendicular to the ground and the flange portion is in contact with the ground. Two first legs S1a are provided on the first installation stand S1, arranged approximately parallel to each other. In the first embodiment, approximately parallel means that the relative angle is 5° or less. This ensures that when the leg 11 is installed on the first installation stand S1, the lower part of the leg 11 is located between the two first legs S1a. As shown in Figures 3 to 6, each of the two first legs S1a has a joint S1a1 to which a horizontal member H (described later) can be pin-joined. The joint S1a1 is provided on the upper part of each of the first legs S1a. Two joints S1a1 are provided on each of the two first legs S1a.

[0020] The first beam S1b connects the two first legs S1a to each other. That is, the first beam S1b extends in a direction along the ground surface that is perpendicular to the direction in which the first leg S1a extends. Both ends of the first beam S1b are joined to the two first legs S1a that are arranged approximately parallel to each other. For example, a known H-shaped steel or I-shaped steel is used for the first beam S1b. In this case, the first beam S1b is arranged, for example, so that the web portion is perpendicular to the ground surface and the flange portion is in contact with the ground surface. Two first beams S1b are arranged approximately parallel to each other on the first installation stand S1. As a result, when the leg 11 is installed on the first installation stand S1, the lower part of the leg 11 is positioned between the two first beams S1b. In the first installation stand S1, for example, two first legs S1a and two first beams S1b are connected in a rectangular frame shape to form a framework F, which is the main part of the first installation stand S1.

[0021] As described above, when the leg 11 is installed on the first installation stand S1, the lower part of the leg 11 is located between the two first legs S1a and the two first beams S1b. In other words, the first installation stand S1 has a hole S1h formed by the two first legs S1a and the two first beams S1b, and the leg 11 is installed on the first installation stand S1 so that the lower part of the leg 11 is inserted into the hole S1h. At this time, as shown in FIGS. 3 and 4, a cross-shaped member 11G is inserted into the hole S1h. This allows the cross-shaped member 11G to function as a guide when installing the leg 11 on the first installation stand S1. Note that in the first embodiment, the lower end of the cross-shaped member 11G inserted into the hole S1h does not come into contact with the ground or the first installation stand S1. That is, in the first embodiment, as shown in Fig. 4, the height h1 of the first leg S1a and the first beam S1b is equal to or greater than the height h2 of the cross-shaped member 11G. Also, the size of the hole S1h in plan view is such that the cross-shaped member 11G can be accommodated without interfering with the hole S1h, as shown in Fig. 6. This prevents loads such as the weight of the legs 11 from acting on the cross-shaped member 11G.

[0022] When the cross-shaped member 11G of the leg 11 is inserted into the hole S1h of the first installation stand S1, the cover member 11C of the leg 11 abuts against the upper surfaces of the first leg portion S1a and the first beam portion S1b of the first installation stand S1, as shown in FIGS. 3 to 6. This allows the leg 11 to be installed on the first installation stand S1. At this time, the first leg portion S1a and the first beam portion S1b are preferably at the same height so that the contact area of ​​the cover member 11C of the leg 11 with the two first leg portions S1a and the two first beam portions S1b is equalized, thereby allowing the load of the leg 11 to act evenly. Furthermore, the hole S1h formed by the two first leg portions S1a and the two first beam portions S1b is preferably square, with the length of one side shorter than the diameter of the cover member 11C and large enough to accommodate the cross-shaped member 11G. Furthermore, the length of one side of hole S1h is preferably long enough to accommodate cross-shaped member 11G without interfering with hole S1h. That is, even if the dimension of cross-shaped member 11G in a direction perpendicular to the axial direction of the lower end of leg 11 is greater than the diameter of cover member 11C, it is preferable that the length be long enough to accommodate cross-shaped member 11G by arranging the plates forming cross-shaped member 11G so that they are aligned along the diagonal of hole S1h in plan view, as shown in FIG.

[0023] The claw portion S1c is a plate-like member attached to the first leg portion S1a or the first beam portion S1b by welding or the like. The claw portion S1c is placed upright on the upper surface of the first leg portion S1a or the first beam portion S1b, and the edge of the plate surface is joined to the first leg portion S1a or the first beam portion S1b. This can, for example, reduce the welding surface of the claw portion S1c to the first leg portion S1a or the first beam portion S1b, thereby improving the workability of welding. 5, the claw portion S1c has a notch S1c1. When the notch S1c1 comes into contact with the lid member 11C of the leg 11, the claw portion S1c engages with the lid member 11C of the leg 11. In this way, the claw portion S1c prevents the leg 11, which is placed on the first placement stand S1, from lifting up from the first placement stand S1.

[0024] 5, the notch S1c1 is provided by cutting out the end of the portion where the claw portion S1c abuts against the first leg portion S1a or the first beam portion S1b. The dimension d1 of the notch S1c1 in the direction along the upper surface of the first leg portion S1a or the first beam portion S1b is large enough to engage with the flange portion 11f formed by the cover member 11C at the bottom of the leg 11. The dimension d2 of the notch S1c1 in the direction perpendicular to the upper surface of the first leg portion S1a or the first beam portion S1b is equal to the thickness of the cover member 11C. As described above, the flange portion 11f is formed on the lower portion of the leg 11 by the cover member 11C, which has a larger diameter than the lower portion of the leg 11. Therefore, as shown in Fig. 3, after the lower portion of the leg 11 is inserted into the hole S1h of the first installation stand S1, when the claw portion S1c is attached to the upper surfaces of the first leg portion S1a and the first beam portion S1b as shown in Fig. 4, the notch S1c1 of the claw portion S1c engages with the cover member 11C. This makes it possible for the claw portion S1c to prevent the leg 11, which is installed on the first installation stand S1, from floating up from the first installation stand S1. The claw portions S1c are provided, for example, evenly on each of the two first leg portions S1a and the two first beam portions S1b. That is, as shown in Fig. 6, for example, two claw portions S1c are provided near both ends in the longitudinal direction of each contact surface A between the cover member 11C of the leg 11 and the first leg portion S1a or the first beam portion S1b. This preferably ensures that the claw portions S1c can reliably prevent the leg 11 from lifting up from the first installation base S1.

[0025] 6, the abutment member S1d abuts against the cover member 11C to determine the horizontal position of the lower part of the leg 11 relative to the first installation stand S1. In the first embodiment, the abutment member S1d is, for example, a plate-shaped member attached to each of the first leg S1a and the first beam S1b by welding or the like. The following describes the abutment member S1d provided on one of the two first legs S1a, but the abutment member S1d is also similarly provided on the other first leg S1a and the two first beams S1b.

[0026] The abutment member S1d is provided in a portion of one of the first legs S1a that corresponds to the middle of one side of the hole S1h. The abutment member S1d includes, for example, a contact plate S1d1 that abuts against the cover member 11C, and a reinforcing plate S1d2 that reinforces the abutment plate S1d1. The contact plate S1d1 is placed upright on the upper surface of the first leg S1a, with the edge of the plate surface joined to the first leg S1a. Two contact plates S1d1 are arranged at a distance from each other on the upper surface of the first leg S1a. The two contact plates S1d1 have the same shape. Of the vertical edges of the contact plate S1d1, the edge facing the hole S1h preferably has an inclined portion S1ds that slopes away from the hole S1h as it moves upward, as shown in FIG. 3, for example. This allows the cover member 11C, which comes into contact with the inclined portion S1ds, to be guided toward the center of the hole S1h as it moves downward when the leg 11 is placed on the first placement stand S1. 3 and 6, the reinforcing plate S1d2 is provided to connect the vertical edges of the legs 11 of the two contact plates S1d1, i.e., the horizontally facing edges that do not face the hole S1h. That is, when the reinforcing plate S1d2 is placed upright on the upper surface of the first leg S1a, the edges of the plate surface are joined to the upper surface of the first leg S1a and the vertically extending edges of the two contact plates S1d1 that do not face the hole S1h. This prevents the reinforcing plate S1d2 from causing the contact plate S1d1 standing on the top surface of the first leg S1a to tip over or become deformed due to contact with the cover member 11C or the like. The contact member S1d is not limited to the above-described configuration, and may be, for example, a block-shaped member having a portion corresponding to the inclined portion S1ds.

[0027] (Transport vehicle) As shown in Fig. 2, the transport vehicle D transports the jacket structure 10 for an offshore wind turbine. The transport vehicle D includes a loading platform Dc on which an object to be transported can be placed, and a plurality of wheels Dt for moving the loading platform Dc. For example, a well-known dolly is suitably used as the transport vehicle D. The loading platform Dc is movable in the vertical direction. The transport vehicle D is arranged on each of the multiple legs 11 of the offshore wind turbine jacket structure 10. For example, when the offshore wind turbine jacket structure 10 is moved straight, the transport vehicles D arranged on each of the legs 11 move simultaneously in the same direction at the same speed. Alternatively, when the offshore wind turbine jacket structure 10 is to change its traveling direction, the speed of each of the transport vehicles D is changed appropriately. In this way, the transport vehicle D transports the legs 11 and the offshore wind turbine jacket structure 10.

[0028] For example, when the jacket structure 10 for an offshore wind turbine is transported, the legs 11 are placed on each of the first transport vehicle D1 and the second transport vehicle D2. At this time, the leg 11 is sandwiched between the first transport vehicle D1 and the second transport vehicle D2. That is, one leg 11 is transported by two transport vehicles D. In the first embodiment, the first transport vehicle D1 and the second transport vehicle D2 have the same configuration. Hereinafter, in the first embodiment, when there is no need to distinguish between the first transport vehicle D1 and the second transport vehicle D2, they will be referred to as the transport vehicle D. It is also possible to transport the jacket structure 10 for an offshore wind turbine lying on the transport vehicle. In this case, the base, which is the part of the jacket structure 10 for an offshore wind turbine that is installed (supported) on the transport vehicle, can be, in addition to the leg, for example, a brace or a transition piece of the jacket structure 10 for an offshore wind turbine. In this case, the foundation may be a reinforcing member provided solely for transporting the jacket structure 10 for an offshore wind turbine.

[0029] For example, when the leg 11 is transported by the transporting vehicle D, the leg 11 is transported in a state where it is placed on the first installation stage S1. In the first embodiment, the transporting vehicle D transports the leg 11 by moving the first installation stage S1. In the first embodiment, when the first installation stage S1 is moved by the transporting vehicle D, one first installation stage S1 is moved by two transporting vehicles D. That is, the first installation stage S1 is engaged with each of the first transporting vehicle D1 and the second transporting vehicle D2, and is sandwiched between the first transporting vehicle D1 and the second transporting vehicle D2. At this time, the transporting vehicle D is arranged so as to follow the longitudinal direction of the first leg S1a of the first installation stage S1. This allows the first installation stage S1 to move in the direction in which the first leg S1a extends. In the first embodiment, the transporting carriage D is locked to the first installation table S1 via a horizontal member H, which will be described next.

[0030] (horizontal material) The horizontal member H engages the transport vehicle D and the first installation platform S1. The horizontal member H is attached to the first installation platform S1 when the offshore wind turbine jacket structure 10 is transported, i.e., when the first installation platform S1 is moved by the transport vehicle D. The lower surfaces of the first horizontal member H1 and the second horizontal member H2 abut against the upper surfaces of the first transport vehicle D1 and the second transport vehicle D2. That is, the transport vehicle D is arranged so that the loading platform Dc is located below the horizontal member H attached to the first installation platform S1, and then moves the loading platform Dc upward to jack up, i.e., lift, the horizontal member H. In this way, the transport vehicle D lifts the first installation platform S1 via the horizontal member H. In the first embodiment, engaging the transport vehicle D and the first installation platform S1 refers to a state in which the first installation platform S1 is lifted by the transport vehicle D. In addition, in the first embodiment, placing the leg 11 on the first transport vehicle D1 and the second transport vehicle D2 means that the first installation stand S1 on which the leg 11 is installed is placed on the first transport vehicle D1 and the second transport vehicle D2.

[0031] When the transport vehicle D and the first installation stand S1 are engaged, a first horizontal member H1 and a second horizontal member H2 are provided on the top of the first installation stand S1. The first horizontal member H1 and the second horizontal member H2 have the same configuration. The first horizontal member H1 and the second horizontal member H2 are members that extend horizontally. At this time, the first horizontal member H1 and the second horizontal member H2 each extend in a direction perpendicular to the direction in which the first leg portion S1a extends. As shown in FIG. 7, each of the first horizontal member H1 and the second horizontal member H2 is removably pin-joined to the first installation stand S1 by a pin Pi. Specifically, each of the first horizontal member H1 and the second horizontal member H2 is pin-joined to a joint S1a1 provided on each of the two first legs S1a, as shown in FIG. 7. At this time, the first horizontal member H1 is positioned so as to be located on the opposite side of the second horizontal member H2 across the pipe axis of the leg 11. The position where the first horizontal member H1 and the first installation stand S1 are pin-joined is symmetrical to the position where the second horizontal member H2 and the first installation stand S1 are pin-joined across the leg 11. This arrangement allows the transport vehicle D to stably lift the first installation stand S1.

[0032] (Method for moving jacket structure for offshore wind turbine) Next, a method for transporting an offshore wind turbine jacket structure according to the first embodiment will be described. That is, in the first embodiment, the offshore wind turbine jacket structure 10 is transported by moving the multiple legs 11 using the above-described components. At this time, the legs 11 are placed on the first transport vehicle D1 and the second transport vehicle D2 together with the first installation base S1 connected thereto, and are jacked up. At this time, the legs 11 included in the multiple legs are sandwiched between the first transport vehicle D1 and the second transport vehicle D2. This makes it possible to transport the entire offshore wind turbine jacket structure 10 stably by stably transporting each of the multiple legs 11.

[0033] When the jacket structure 10 for an offshore wind turbine assembled in the yard Y is moved to the transporting ship B, each of the multiple legs 11 together with the first installation stand S1 is jacked up by the first transport vehicle D1 and the second transport vehicle D2 via the first horizontal member H1 and the second horizontal member H2 on the ground Y1 of the yard Y as described above, and the first transport vehicle D1 and the second transport vehicle D2 are made to travel, thereby moving the entire jacket structure 10 for an offshore wind turbine from the state shown in Fig. 1 onto the deck B1 of the ship B as shown in Fig. 9. At this time, a transfer plate (not shown) on which the first transport vehicle D1 and the second transport vehicle D2 can travel may be appropriately laid between the ground Y1 of the yard Y and the deck B1 of the ship B. In addition, Figures 1 and 9 show the case where the ship B on which the jacket structure 10 for an offshore wind turbine is loaded is a barge towed by a tugboat, but the ship B on which the jacket structure 10 for an offshore wind turbine is loaded may also be a ship other than a barge that is capable of sailing under its own power.

[0034] Then, the offshore wind turbine jacket structure 10 moved onto the deck B1 of the ship B is positioned at a predetermined installation position. That is, on the deck B1 of the ship B, each of the multiple legs 11 is transported together with the first installation platform S1, the first horizontal member H1, and the second horizontal member H2 by the first transport vehicle D1 and the second transport vehicle D2, and positioned vertically above a predetermined installation position. Then, each of the multiple legs 11 is simultaneously jacked down by the first transport vehicle D1 and the second transport vehicle D2. Then, the first installation platform S1 on which each of the multiple legs 11 is installed is placed at a predetermined installation position on the deck B1. At this time, each of all of the first installation platforms S1 is arranged so as to straddle at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. That is, each of the first installation stands S1 is arranged so that it spans at least two beams, at least two walls, or at least one beam and at least one wall. Beams that are deck support members include transbeams that extend in a direction connecting one side of ship B with the other side and support the deck B1 from below, and longitudinal members (longi beams, longitudinal girders) that extend in a direction connecting the bow and stern of ship B and support the deck B1 from below. Furthermore, walls that are deck support members include transbulkheads that extend in a direction connecting one side of ship B with the other side and support the deck B1 from below, and longitudinal bulkheads that extend in a direction connecting the bow and stern of ship B and support the deck B1 from below. Each of all the first installation stands S1 is placed on ship B, for example, as shown in Figure 10(a), so that it straddles one of the trans beams B2, which is a beam that extends in the direction connecting one end of the ship B's side and the other end of the ship's side and supports the deck B1 from below, and any other trans beam B2 that extends in the direction connecting one end of the ship B's side and the other end of the ship's side and supports the deck B1 from below, or so that it straddles one of the trans beams B2 and a trans bulkhead, which is a wall that extends in the direction connecting one end of the ship B's side and the other end of the ship's side and supports the deck B1 from below.All of the first installation stands S1 may, for example, each straddle at least two of the transbeams B2, or at least one of the transbeams B2 and one of the transbulkheads. Thus, each first installation stand S1 may, for example, straddle two of the transbeams B2 and one of the transbulkheads, or may straddle one of the transbeams B2 and two of the transbulkheads, or may straddle two of the transbeams B2 and two of the transbulkheads. Then, all of the first installation stands S1 placed in predetermined placement positions on the deck B1 are appropriately fixed to the deck B1. 10(b), the first installation base S1 may be placed on the ship B so as to straddle one of the transbeams B2 and one of the longitudinal members (longi beam or longitudinal girder) B3, which is a beam that extends in a direction connecting the bow and stern of the ship B and supports the deck B1 from below, or a longitudinal bulkhead, which is a wall that extends in a direction connecting the bow and stern of the ship B and supports the deck B1 from below. Alternatively, the first installation base S1 may be placed on the ship B so as to straddle at least two longitudinal members. Alternatively, the first installation base S1 may be placed on the ship B so as to straddle at least two longitudinal bulkheads.

[0035] The above is the moving step of moving the jacket structure 10 for an offshore wind turbine, which is an offshore structure, onto the ship B together with the first installation stand S1 that has been used for the yard Y. When the first transport vehicle D1 and the second transport vehicle D2 jack down the jacket structure 10 for an offshore wind turbine on the ship B, they will, for example, travel and move from above the ship B to the yard Y side. Also, when the first transport vehicle D1 and the second transport vehicle D2 jack down the jacket structure 10 for an offshore wind turbine on the ship B, the first horizontal members H1 and the second horizontal members H2 will be removed from the first installation stand S1, for example, by pulling out the pins Pi.

[0036] As described above, with the offshore wind turbine jacket structure 10 installed on the ship B via the first installation stands S1, all of the first installation stands S1 are appropriately fixed to the deck B1 of the ship B. The ship B, with the offshore wind turbine jacket structure 10 loaded via the first installation stands S1 in this manner, sails to, for example, an installation site. Then, at the installation site, the offshore wind turbine jacket structure 10 is detached from all of the first installation stands S1 and is installed offshore by, for example, being lifted up and connected to steel pipe piles driven into the seabed.

[0037] As described above, the first embodiment of the installation base system 100 on which the jacket structure 10 for an offshore wind turbine is installed includes a first installation base S1 on which the leg 11, which is the base of the jacket structure 10 for an offshore wind turbine, which is a fixed-bottom foundation that supports the offshore wind turbine, is installed.

[0038] In addition, in this installation base system 100, the first installation base S1 serves as both a yard installation base placed in yard Y and an on-board installation base placed on ship B. In other words, this installation base system 100 includes the first installation base S1, which is a yard installation base placed in yard Y and on which legs 11, which are the bases of the jacket structure 10 for an offshore wind turbine, are installed. In addition, this installation base system 100 includes the first installation base S1, which is a on-board installation base placed on ship B and on which legs 11, which are the bases of the jacket structure 10 for an offshore wind turbine, are installed.

[0039] Furthermore, the first installation base S1, which is a yard installation base, and the first installation base S1, which is a shipboard installation base, are the same in this installation base system 100. Therefore, in this installation base system 100, the framework F including the two first leg portions S1a and two first beam portions S1b of the first installation base S1, which is a yard installation base, and the framework F including the two first leg portions S1a and two first beam portions S1b of the first installation base S1, which is a shipboard installation base, are common.

[0040] In addition, in this installation base system 100, the first installation base S1, which serves as both the yard installation base and the shipboard installation base, is made of steel. In addition, in this installation base system 100, the first installation base S1, which serves as both a yard installation base and a shipboard installation base, uses shaped steel such as an H-beam or an I-beam for at least the first leg S1a.

[0041] Furthermore, this installation base system 100 is placed on the ship B so that the first installation base S1, which serves as the shipboard installation base, spans at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. That is, the first installation base S1 is placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0042] As explained above, the installation base system 100 according to the first embodiment includes the first installation base S1, which is a yard installation base on which the legs 11, which are the bases of the offshore wind turbine jacket structure 10, are installed and which is placed in the yard Y. The installation base system 100 also includes the first installation base S1, which is a shipboard installation base on which the legs 11, which are the bases of the offshore wind turbine jacket structure 10, are installed and which is placed on the ship B. Therefore, the installation base system 100 makes it possible to install the offshore wind turbine jacket structure 10, which is a marine structure, on both the yard Y and the ship B.

[0043] Furthermore, in this installation base system 100, the legs 11 that are the bases of the offshore wind turbine jacket structure 10 are installed, and the first installation base S1 that is a yard installation base that is placed in the yard Y is made of steel. Therefore, in this installation base system 100, by making the first installation base S1 that is a yard installation base out of steel, the weight of the first installation base S1 that is a yard installation base is lighter than when this first installation base S1 that is a yard installation base is made out of concrete.

[0044] Furthermore, in this installation base system 100, the first installation base S1, which is the yard installation base, and the first installation base S1, which is the shipboard installation base, are the same, i.e., identical. Therefore, this installation base system 100 can use the same first installation base S1 on both the yard Y and the ship B. This makes it possible to reduce the number of first installation bases S1 used, and also eliminates the need to transfer the offshore wind turbine jacket structure 10 from the yard installation base to the shipboard installation base, thereby achieving significant cost reductions. Note that the first installation base S1, which is the yard installation base, and the first installation base S1, which is the shipboard installation base, do not have to be the same.

[0045] Furthermore, in this installation base system 100, the first installation base S1, which serves as both the yard installation base and the shipboard installation base, is made of steel. Because it can be used for both purposes, the installation base system 100 facilitates the manufacture of the first installation base S1, which serves as both the yard installation base and the shipboard installation base, thereby achieving cost reduction. Note that the first installation base S1, which serves as both the yard installation base and the shipboard installation base, does not have to be made of steel.

[0046] Furthermore, in this installation base system 100, shaped steel is used for the first installation base S1, which serves as both the yard installation base and the shipboard installation base. This makes it easier to manufacture the first installation base S1, which serves as both the yard installation base and the shipboard installation base, in this installation base system 100, and further reduces costs. However, shaped steel does not have to be used for the first installation base S1, which serves as both the yard installation base and the shipboard installation base.

[0047] Furthermore, this installation base system 100 is placed on the ship B so that the first installation base S1, which serves as the ship-mounted installation base, spans at least two of the multiple beams and multiple walls, which are deck support members that support the deck B1 from below. That is, the first installation base S1 is placed on the ship B so that it spans at least two beams, at least two walls, or at least one beam and at least one wall. Therefore, this installation base system 100 can be reliably placed on the ship B even if the item to be installed on the first installation base S1, which serves as the ship-mounted installation base, is a heavy object such as the jacket structure 10 for an offshore wind turbine, which is a jacket-type foundation. Note that the first installation base S1, which serves as the ship-mounted installation base, does not have to be placed on the ship B so as to span one deck support member and one other deck support member.

[0048] Furthermore, the moving method according to the first embodiment includes a moving step of moving the jacket structure 10 for an offshore wind turbine, which is an offshore structure, onto a ship B together with the first installation stand S1 that was used for the yard Y. In this moving method, since the yard installation stand and the shipboard installation stand are the same first installation stand S1, it is possible to eliminate the need to transfer the jacket structure 10 for an offshore wind turbine from the yard installation stand to the shipboard installation stand when moving the jacket structure 10 from the yard Y onto the ship B. Furthermore, since the first installation stand S1 that is the yard installation stand is made of steel, the first installation stand S1 that is the yard installation stand is relatively light, and it becomes possible to easily move the jacket structure 10 for an offshore wind turbine together with the first installation stand S1 that is the yard installation stand. The fact that the first installation stand S1 is relatively light in this way is more effective when moving an offshore structure by crane.

[0049] The installation stand system 100 and the movement method according to the first embodiment described above can be modified as in the following Modifications 1-1 to 1-5. Modifications 1-1 to 1-5 can also be combined as appropriate.

[0050] <Variation 1-1> The installation base system 100 and the moving method according to the first embodiment have been described as a case in which the offshore wind turbine jacket structure 10 is moved together with the first installation base S1 from the yard Y to the ship B using the transport platform D, and the offshore wind turbine jacket structure 10 is then mounted and fixed to the ship B via the same first installation base S1. In contrast, in the installation base system and the moving method according to the modified example 1-1, the offshore wind turbine jacket structure 10 is moved together with the first installation base S1 from the yard Y to the ship B using a skid beam (not shown), and the offshore wind turbine jacket structure 10 is then mounted and fixed to the ship B via the same first installation base S1.

[0051] In this case, for example, a laying step is performed in which a skid beam is laid from the yard Y onto the ship B. In the laying step, the skid beam may be laid from the yard Y onto the ship B below the first horizontal members H1 and second horizontal members H2 of a first installation stand S1 that is provided in the yard Y and on which each of the multiple legs 11 of the jacket structure 10 for an offshore wind turbine is placed. Then, a jacking-up step is performed in which the multiple legs 11 of the jacket structure 10 for an offshore wind turbine together with the first installation stand S1 on which they are placed are jacked up via the first horizontal members H1 and the second horizontal members H2 to jack up the entire jacket structure 10 for an offshore wind turbine. Then, a placing step is performed in which the multiple legs 11 of the jacket structure 10 for an offshore wind turbine together with the first installation stand S1 on which they are placed are jacked down via the first horizontal members H1 and the second horizontal members H2 on the skid beam. Then, the multiple legs 11 of the offshore wind turbine jacket structure 10, together with the first installation stands S1 on which they are placed, are placed on the skid beam via the first horizontal members H1 and the second horizontal members H2. In this state, the multiple legs 11 of the offshore wind turbine jacket structure 10, together with the first installation stands S1 on which they are placed, are slid and moved on the skid beam, thereby performing a transfer step in which the offshore wind turbine jacket structure 10, together with the multiple first installation stands S1 on which it is placed, is moved onto the ship B. In this way, the offshore wind turbine jacket structure 10, together with the first installation stands S1, is positioned vertically above a predetermined installation position similar to that in the first embodiment. Then, the offshore wind turbine jacket structure 10, together with the first installation stands S1, is jacked up via the first horizontal members H1 and the second horizontal members H2. Thereafter, an installation step is performed in which the skid beam is removed, and the multiple legs 11 of the offshore wind turbine jacket structure 10, together with the first installation base S1 on which each is placed, are jacked down via the first horizontal members H1 and the second horizontal members H2 to be placed in predetermined installation positions similar to those in the first embodiment. Then, each of the first installation bases S1 is fixed to the ship B. Here, the movement of the offshore wind turbine jacket structure 10 on the skid beam may be by being pushed from the yard Y side to the ship B side, or by being towed from the yard Y side to the ship B side. Note that there is also a case in which the skid beam is not removed from the ship B.For example, the jacket structure 10 for an offshore wind turbine is placed on a skid beam on a ship (barge) in a horizontal position. Then, while still placed on the ship, the ship is moved to a point in deep water, and then the jacket structure 10 for an offshore wind turbine is installed using the skid beam by launching (a construction method in which the barge is tilted and slid down into the sea).

[0052] The above is the moving step of using the skid beam to move the jacket structure 10 for an offshore wind turbine, which is an offshore structure, onto the ship B together with the first installation stand S1 that was used for the yard Y. The moving step in this case includes a jacking-up step of jacking up the jacket structure 10 for an offshore wind turbine, which is an offshore structure, together with the first installation stand S1, which is the yard installation stand, and a placing step of placing the jacket structure 10 for an offshore wind turbine jacked up in this jacking-up step and the first installation stand S1, which is the yard installation stand, on the skid beam.

[0053] In this modification 1-1, the offshore wind turbine jacket structure 10, which is an offshore structure, and the first installation stand S1, which is a yard installation stand, can be more reliably moved from the yard Y to the ship B using a skid beam. This allows the offshore wind turbine jacket structure 10 to be more reliably moved from the yard Y to the ship B.

[0054] <Variation 1-2> In addition to using a transport platform D to move the jacket structure 10 for an offshore wind turbine together with the first installation stand S1 from the yard Y to the ship B as in the first embodiment, or using a skid beam (not shown) to move the jacket structure 10 for an offshore wind turbine together with the first installation stand S1 from the yard Y to the ship B as in variant example 1-1, as an installation stand system and moving method according to variant example 1-2, it is also possible to use a crane (not shown) to move the jacket structure 10 for an offshore wind turbine together with the first installation stand S1 from the yard Y onto the ship B, and then place the jacket structure 10 for an offshore wind turbine in a predetermined mounting position similar to that of the first embodiment on the ship B via the same first installation stand S1.

[0055] <Variation 1-3> The installation base system and moving method according to the first embodiment, modified example 1-1, and modified example 1-2 have been described as a case in which the offshore wind turbine jacket structure 10 is moved from the yard Y to the ship B together with the first installation base S1, and the offshore wind turbine jacket structure 10 is then mounted and fixed to the ship B via the same first installation base S1. In contrast, the installation base system and moving method according to modified example 1-3 uses a first installation base S1 that has a common configuration with the first installation base S1 that is the yard installation base, but is different from the first installation base S1 that is the yard installation base, as the shipboard installation base. Here, "configuration" means "shape, framework, material, etc."

[0056] In this case, the moving method includes a arranging step and an installation step. The arranging step is a step of arranging a first installation stand S1, which is an on-board installation stand, on the ship B. The installation step is a step of transferring the jacket structure 10 for an offshore wind turbine from the first installation stand S1, which is a yard installation stand, to the first installation stand S1 arranged on the ship B in the arranging step and installing it thereon.

[0057] In the placement step, the first installation stand S1, which is an on-board installation stand, is preferably placed on the ship B so as to span at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below, as in the first embodiment. That is, the first installation stand S1 is preferably placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0058] In the installation step, for example, in yard Y, the jacket structure 10 for an offshore wind turbine is removed from the first installation stand S1, which is a yard installation stand, and the jacket structure 10 for an offshore wind turbine is transported onto ship B using a crane, a transport vehicle, a skid beam, or the like. Then, in the arrangement step, the legs 11 of the jacket structure 10 for an offshore wind turbine are installed using a crane, or the like, on each of the first installation stands S1, which are on-board installation stands, that were installed on ship B in advance. Also, for example, the jacket structure 10 for an offshore wind turbine together with the first installation stand S1, which is a yard installation stand, is moved from yard Y onto ship B using a crane, a transport vehicle D, a skid beam, or the like, and on ship B, the jacket structure 10 for an offshore wind turbine is removed from the first installation stand S1, which is a yard installation stand, and the jacket structure 10 for an offshore wind turbine is moved using a crane, or the like, and the legs 11 are installed on each of the first installation stands S1, which are on-board installation stands, that were installed on ship B in advance in the arrangement step. Here, when an installation stand such as the first installation stand S1 is installed in a predetermined location, "installation" also includes the state in which the installation stand such as the first installation stand S1 is simply placed in the predetermined location (without being fixed in place).

[0059] Even with this configuration, it is possible to use the first installation stand S1 with a common configuration on both the yard Y and the ship B, which reduces costs compared to using installation stands with different configurations on both the yard Y and the ship B. Note that a first installation stand S1 that has a common configuration with the first installation stand S1 that is the yard installation stand and is different from the first installation stand S1 that is the yard installation stand does not have to be used as the shipboard installation stand.

[0060] <Variation 1-4> The installation table system and movement method according to Modification 1-3 have been described using an example in which the first installation table S1, which is a yard installation table, and the first installation table S1, which is a shipboard installation table (not shown), have a common configuration but are prepared separately. In contrast, in the installation table system and movement method according to Modification 1-4, the first installation table S1, which is a yard installation table, and the second installation table S1, which is a shipboard installation table (not shown), have different configurations. It is preferable that the second installation table S1, which is a shipboard installation table (not shown), be made of steel as well.

[0061] For example, if the first installation base S1, which is a yard installation base, is not suitable for use as a shipboard installation base, a second installation base different from the first installation base S1 is used as the shipboard installation base. In this case, it is preferable to use a common framework F, for example, including two first legs S1a and two first beams S1b, between the first installation base S1 and the second installation base. In this way, by using a common framework F for the first installation base S1, which is a yard installation base, and the second installation base, which is a shipboard installation base, it becomes possible to facilitate the manufacture and handling of each of them. Furthermore, if the framework F is common between the first installation base S1 and the second installation base, shaped steel can also be used for the second installation base, which is a shipboard installation base, and this facilitates the manufacture of both the first installation base S1, which is a yard installation base, and the second installation base, which is a shipboard installation base.

[0062] In this case, the moving method includes a disposing step and an installation step. The disposing step is a step of disposing a second installation stand, which is an on-board installation stand, on the ship B. The installation step is a step of transferring the jacket structure 10 for an offshore wind turbine from the first installation stand S1, which is a yard installation stand, to the second installation stand disposed on the ship B in the disposing step and installing it thereon.

[0063] In the arranging step, the second installation stand, which is an on-board installation stand, is preferably placed on the ship B so as to span at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below. That is, the second installation stand is preferably placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0064] In the installation step, for example, in yard Y, the jacket structure 10 for an offshore wind turbine is removed from a first installation stand S1, which is a yard installation stand, and the jacket structure 10 for an offshore wind turbine is transported onto ship B using a crane, a transport vehicle, a skid beam, or the like. Then, in the arrangement step, the legs 11 of the jacket structure 10 for an offshore wind turbine are installed using a crane, or the like, on each of the second installation stands, which are on-board installation stands, that were installed on ship B in advance in the arrangement step. Also, for example, the jacket structure 10 for an offshore wind turbine together with the first installation stand S1, which is a yard installation stand, is moved onto ship B using a crane, a transport vehicle, a skid beam, or the like, and on ship B, the jacket structure 10 for an offshore wind turbine is removed from the first installation stand S1, which is a yard installation stand, and the jacket structure 10 for an offshore wind turbine is moved using a crane, or the like, and the legs 11 are installed on each of the second installation stands, which are on-board installation stands, that were installed on ship B in advance in the arrangement step. The framework F of the first installation base S1, which is the installation base for the yard, and the framework F of the second installation base, which is the installation base for the ship, do not have to be the same.

[0065] <Variation 1-5> In the installation table system and movement method according to Modification 1-4, the first installation table S1, which is a yard installation table, and the second installation table, which is a shipboard installation table, are configured differently but share a common framework F. In contrast, in the installation table system and movement method according to Modification 1-5, the first installation table S1, which is a yard installation table, and the second installation table, which is a shipboard installation table, are configured differently from the framework.

[0066] For example, the first installation base S1, which is a yard installation base, is desirably small in size because it is sufficient to distribute the load of the offshore wind turbine jacket structure 10, which is an offshore structure, to the sturdy yard Y. In contrast, the second installation base, which is a shipboard installation base, is desirably sized to be able to straddle multiple deck support members of the ship B because the strength of the deck B1 of the ship B varies depending on the location. If the first installation base S1, which is a yard installation base, is smaller than this size, the framework of the second installation base, which is a shipboard installation base, is made larger than the framework F of the first installation base S1, which is a yard installation base. In this way, by differentiating the frameworks of the first installation base S1, which is a yard installation base, and the second installation base, which is a shipboard installation base, it is possible to prepare appropriate ones for each. In this case, it is preferable that the second installation base, which is a shipboard installation base, is also made of steel. Moreover, it is preferable that shaped steel be used for the second installation base, which is a shipboard installation base. By using shaped steel, it becomes easy to manufacture the first installation stand S1, which is an installation stand for the yard, and the second installation stand, which is an installation stand for onboard the ship.

[0067] The movement method in this case is also the same as the movement method in Modification Example 1-4. In this case, too, it is preferable that the second installation base, which is an on-board installation base, be placed on the ship B so as to span at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. In other words, it is preferable that the second installation base be placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall. The first installation base S1, which is an installation base for use in a yard, and the second installation base, which is an installation base for use on a ship, do not need to have different configurations in terms of their frameworks.

[0068] [Second embodiment] Next, an installation stand system and a movement method according to a second embodiment of the present disclosure will be described, focusing on differences from the first embodiment, mainly with reference to FIGS. FIG. 11 is a front view showing the first installation stand S2 used in the installation stand system 200 according to the second embodiment. FIG. 12 is a perspective view showing a first installation stand S2 used in an installation stand system 200 according to the second embodiment.

[0069] The installation base system 100 and movement method according to the first embodiment and Modifications 1-1 to 1-5 are intended for an offshore wind turbine jacket structure 10 as the marine structure. In contrast, the installation base system 200 and movement method according to the second embodiment (the same applies to the installation base systems and movement methods according to Modifications 2-1 to 2-5 described below) are intended for an offshore wind turbine monopile foundation 210 (offshore structure) that supports the offshore wind turbine as the marine structure. The offshore wind turbine monopile foundation 210 is also a fixed-bottom foundation.

[0070] The installation base system 200 according to the second embodiment includes a yard installation base on which the offshore wind turbine monopile foundation 210 is installed and placed in yard Y, and a ship-mounted installation base on which the offshore wind turbine monopile foundation 210 is installed and placed on ship B. Both the yard installation base and the ship-mounted installation base are installed with the offshore wind turbine monopile foundation 210 lying down. In the installation base system 200 according to the second embodiment, the yard installation base and the ship-mounted installation base are the same, in other words, identical, and form a first installation base S2 as shown in FIGS. 11 and 12. The first installation base S2 has a mirror-symmetric shape. The first installation base S2 does not have to have a mirror-symmetric shape. The first installation stand S2 which is the yard installation stand and the first installation stand S2 which is the shipboard installation stand do not have to be the same.

[0071] The first installation base S2 has a leg portion S2a which is a lower framework that is placed on the ground Y1 of the yard Y and the deck B1 of the ship B, and an upper, approximately U-shaped portion S2b on which the monopile foundation 210 for an offshore wind turbine is installed in a lying state.

[0072] The leg S2a has a leg body S2a1 and a plurality of lower reinforcing members S2a2a to S2a2e. The leg body S2a1 includes a lower flange S2a11, an upper flange S2a12, and a web S2a13.

[0073] The lower flange S2a11 of the leg body S2a1 is in the form of a flat plate, and has a rectangular shape that extends horizontally in one direction and widens horizontally. The web S2a13 of the leg body S2a1 is flat, extends in the same direction as the lower flange S2a11, and rises vertically upward from the center of the shorter side of the lower flange S2a11. The web S2a13 has an isosceles trapezoidal shape that becomes shorter toward the top. The upper flange S2a12 of the leg body S2a1 is flat and rectangular, extending horizontally in the same direction as the lower flange S2a11. The upper flange S2a12 has the upper edge of the web S2a13 connected to the center of its short side. The length of the upper flange S2a12 in the long side direction is equal to the length of the upper edge of the web S2a13. The leg body S2a1 is made of steel, and a known shaped steel such as an H-beam or an I-beam is used.

[0074] The plurality of lower reinforcing members S2a2a-S2a2e of the leg portion S2a are all flat plates made of steel and are all provided on the surface side of the web S2a13. The plurality of lower reinforcing members S2a2a-S2a2e extend perpendicular to the lower flange S2a11, the upper flange S2a12, and the web S2a13 and are all joined to the lower flange S2a11, the upper flange S2a12, and the web S2a13 by, for example, welding. On the surface side of the web S2a13, the lower reinforcing members S2a2a-S2a2e are arranged at predetermined intervals in the extending direction of the web S2a13 in the following order: lower reinforcing member S2a2a, lower reinforcing member S2a2b, lower reinforcing member S2a2c, lower reinforcing member S2a2d, lower reinforcing member S2a2e.

[0075] The lower reinforcing member S2a2c is provided at a central position in the direction in which the web S2a13 extends. The lower reinforcing members S2a2b and S2a2d are provided symmetrically at positions equidistant from the lower reinforcing member S2a2c. The lower reinforcing members S2a2a and S2a2e are also provided symmetrically at positions equidistant from the lower reinforcing member S2a2c. The distance between the lower reinforcing member S2a2c and the lower reinforcing member S2a2b or the lower reinforcing member S2a2d is longer than the distance between the lower reinforcing member S2a2b and the lower reinforcing member S2a2a and the distance between the lower reinforcing member S2a2d and the lower reinforcing member S2a2e.

[0076] Furthermore, on the rear surface of the web S2a13, a plurality of lower reinforcing members similar to the lower reinforcing members S2a2a to S2a2e on the front surface side of the web S2a13 are provided at the same positions as the lower reinforcing members S2a2a to S2a2e, in the same manner as the lower reinforcing members S2a2a to S2a2e.

[0077] The substantially U-shaped portion S2b has a base member S2b1, a steel prevention member S2b2, a plurality of upper reinforcing members S2b3a to S2b3f, and a plurality of upper end members S2b4a and S2b4b.

[0078] The base member S2b1 is a flat steel plate that extends in the same direction as the upper flange S2a12 of the leg S2a and rises vertically upward from the center of the short side of the upper flange S2a12. The base member S2b1 is joined to the upper flange S2a12 by welding, for example. A semicircular recess S2b1a that recesses from top to bottom is formed in the center of the upper flange S2a12 in the extension direction.

[0079] The steel prevention member S2b2 is made of steel and has a curved plate shape, specifically a semi-cylindrical surface shape. The steel prevention member S2b2 is disposed within the recessed portion S2b1a of the base member S2b1 and is joined to the entire recessed portion S2b1a at the center in the direction of the central axis of its curvature, for example, by welding. The central axis of the curvature of the steel prevention member S2b2 extends perpendicular to the base member S2b1.

[0080] The multiple upper reinforcing members S2b3a-S2b3f are all flat plates, all made of steel, and all provided on the surface side of the base member S2b1. The multiple upper reinforcing members S2b3a-S2b3f extend perpendicular to the base member S2b1 and are all joined to both the base member S2b1 and the steel prevention member S2b2, for example by welding. On the surface side of the base member S2b1, the upper reinforcing members S2b3a-S2b3f are arranged at intervals in the circumferential direction of the steel prevention member S2b2 in the following order: upper reinforcing member S2b3a, upper reinforcing member S2b3b, upper reinforcing member S2b3c, upper reinforcing member S2b3d, upper reinforcing member S2b3e, and upper reinforcing member S2b3f.

[0081] The upper reinforcing member S2b3b extends from the steel prevention member S2b2 substantially along the normal direction of the steel prevention member S2b2 and is joined, for example, by welding, to the upper flange S2a12 at the joining position of the lower reinforcing member S2a2a. The upper reinforcing member S2b3a extends from the steel prevention member S2b2 above the upper reinforcing member S2b3b substantially along the normal direction of the steel prevention member S2b2. The upper reinforcing member S2b3c extends vertically downward from the steel prevention member S2b2 and is joined, for example, by welding, to the upper flange S2a12 at the joining position of the lower reinforcing member S2a2b. The upper reinforcing member S2b3e extends from the steel prevention member S2b2 substantially along the normal direction of the steel prevention member S2b2 and is joined, for example, by welding, to the upper flange S2a12 at the joining position of the lower reinforcing member S2a2e. The upper reinforcing member S2b3f extends above the upper reinforcing member S2b3e and substantially along the normal direction of the steel prevention member S2b2. The upper reinforcing member S2b3d extends vertically downward from the steel prevention member S2b2 and is joined by, for example, welding, to the upper flange S2a12 at the joining position of the lower reinforcing member S2a2d.

[0082] Furthermore, on the rear surface of the base member S2b1, a plurality of upper reinforcing members similar to the upper reinforcing members S2b3a to S2b3f on the front surface of the base member S2b1 are provided at the same positions as the upper reinforcing members S2b3a to S2b3f, in the same manner as the upper reinforcing members S2b3a to S2b3f.

[0083] The multiple upper end members S2b4a, S2b4b are all flat, made of steel, and are all provided at the upper end of the base member S2b1. The multiple upper end members S2b4a, S2b4b extend perpendicular to the base member S2b1 and are all joined to both the base member S2b1 and the steel prevention member S2b2, for example, by welding. The multiple upper end members S2b4a, S2b4b extend from the steel prevention member S2b2 in a direction substantially normal to the steel prevention member S2b2. The multiple upper end members S2b4a, S2b4b extend in the same horizontal plane. As a result, the substantially U-shaped portion S2b has an upwardly opening substantially U-shape. The first installation base S2 including the leg portion S2a and the substantially U-shaped portion S2b is made of steel, and shaped steel is used. The first installation stand S2, which serves as both the yard installation stand and the shipboard installation stand, does not have to be made of steel. Furthermore, the first installation stand S2, which serves both as a yard installation stand and a shipboard installation stand, does not necessarily have to be made of structural steel.

[0084] The offshore wind turbine monopile foundation 210 is placed on the first installation base S2 in a laid-down state, with the cylindrical portion 210a placed inside the steel prevention member S2b2 of the approximately U-shaped portion S2b. The inner diameter of the steel prevention member S2b2 is slightly larger than the outer diameter of the cylindrical portion 210a of the offshore wind turbine monopile foundation 210. The steel prevention member S2b2 supports the offshore wind turbine monopile foundation 210 and prevents it from rolling.

[0085] The first installation base S2, which can be used both as a yard installation base and a shipboard installation base, includes a substantially U-shaped portion S2b. Furthermore, the first installation base S2, which can be used both as a yard installation base and a shipboard installation base, has steel prevention members S2b2 welded thereto to prevent the offshore wind turbine monopile foundation 210 from rolling. The shape of the first placement stand S2 is merely an example.

[0086] In the moving method according to the second embodiment, a first installation base S2 constituting a yard installation base to be placed in a yard Y on which an offshore wind turbine monopile foundation 210, which is an offshore structure, is installed is transported onto a ship B by a transport vehicle with the offshore wind turbine monopile foundation 210 installed, and is placed at a predetermined mounting position on the ship B with the offshore wind turbine monopile foundation 210 still installed. As a result, the first installation base S2 constituting the yard installation base constitutes an on-ship installation base on which the offshore wind turbine monopile foundation 210, which is an offshore structure, is installed and placed on the ship B. Therefore, the installation base system 200 according to the second embodiment includes the first installation base S2 that serves as both a yard installation base and an on-ship installation base. The moving method according to the second embodiment also includes a moving step of moving the offshore wind turbine monopile foundation 210, which is an offshore structure, onto the ship B together with the first installation base S2, which is a yard installation base. In this case, too, it is preferable that the first installation stand S2, which is an on-board installation stand, be placed on the ship B so as to straddle at least two or more of the plurality of beams and the plurality of walls, which are deck support members that support the deck B1 from below. In other words, it is preferable that the first installation stand S2 be placed on the ship B so as to straddle at least two beams, at least two walls, or at least one beam and at least one wall.

[0087] The first installation stand S2, which can be used as both a yard installation stand and a shipboard installation stand, is the same as the first installation stand S2 as a yard installation stand and the first installation stand S2 as a shipboard installation stand, and naturally, the legs S2a, which are the lower framework, are the same.

[0088] The installation stand system 200 and the movement method according to the second embodiment described above each have the same effects as those of the first embodiment. Furthermore, the first installation base S2, which serves both as a yard installation base and a ship-mounted installation base, includes a substantially U-shaped portion S2b, so that the monopile foundation 210 for an offshore wind turbine in a laid-down state can be more reliably placed on the yard Y or the ship B. Note that the first installation base S2, which serves both as a yard installation base and a ship-mounted installation base, does not have to include the substantially U-shaped portion S2b. The first installation base S2, which is a yard installation base, is provided with steel prevention members S2b2 by welding to prevent the offshore wind turbine monopile foundation 210 from rolling. Because the first installation base S2, which is a yard installation base, is made of steel, the steel prevention members S2b2 that prevent the offshore wind turbine monopile foundation 210 from rolling can be easily provided on the first installation base S2, which is a yard installation base. Note that the first installation base S2, which is a yard installation base, does not need to be provided with the steel prevention members S2b2 by welding to prevent the offshore wind turbine monopile foundation 210 from rolling.

[0089] The installation stand system 200 and the movement method according to the second embodiment described above can be modified as in the following Modifications 2-1 to 2-5. Modifications 2-1 to 2-5 can also be combined as appropriate.

[0090] <Variation 2-1> The installation base system 200 and the moving method according to the second embodiment have been described as a case in which the offshore wind turbine monopile foundation 210 is moved together with the first installation base S2 from the yard Y to the ship B using a transport vehicle, and then the offshore wind turbine monopile foundation 210 is mounted and fixed to the ship B via the same first installation base S2. In contrast, in the installation base system and the moving method according to the modified example 2-1, the offshore wind turbine monopile foundation 210 is moved together with the first installation base S2 from the yard Y to the ship B using a skid beam (not shown), and then the offshore wind turbine monopile foundation 210 is mounted and fixed to the ship B via the same first installation base S2.

[0091] In this case, for example, a laying step is performed in which a skid beam is laid from the yard Y onto the ship B. In the laying step, the beam of the skid beam may be laid from the yard Y onto the ship B below a first installation stand S2 that is provided in the yard Y and on which the monopile foundation for an offshore wind turbine 210 is placed. Then, a jacking-up step is performed in which the monopile foundation for an offshore wind turbine 210 is jacked up together with the first installation stand S2. Then, a placing step is performed in which the monopile foundation for an offshore wind turbine 210 is jacked down together with the first installation stand S2 on the skid beam. Then, the monopile foundation for an offshore wind turbine 210 is placed on the skid beam together with the first installation stand S2. In this state, the monopile foundation 210 for an offshore wind turbine is slid along the skid beam together with the first installation base S2 on which it is placed, thereby performing a transfer step in which the monopile foundation 210 for an offshore wind turbine and the first installation base S2 on which it is placed are moved onto the ship B. In this way, the monopile foundation 210 for an offshore wind turbine together with the first installation base S2 is positioned vertically above the predetermined installation position similar to that of the second embodiment. Then, the monopile foundation 210 for an offshore wind turbine together with the first installation base S2 is jacked up. After that, the skid beam is removed, and the monopile foundation 210 for an offshore wind turbine together with the first installation base S2 is jacked down and placed in the predetermined installation position similar to that of the second embodiment, performing an installation step. Then, the first installation base S2 is fixed to the ship B. Here, the movement of the offshore wind turbine monopile foundation 210 on the skid beam may be by being pushed from the yard Y side to the ship B side, or by being towed from the yard Y side to the ship B side. Note that there are cases where the skid beam is not removed from the ship B.

[0092] The above is the moving step of using a skid beam to move the monopile foundation 210 for an offshore wind turbine, which is an offshore structure, onto the ship B together with the first installation base S2 that was being used for the yard. The moving step in this case includes a jacking-up step of jacking up the monopile foundation 210 for an offshore wind turbine, which is an offshore structure, together with the first installation base S2, which is the yard installation base, and a placing step of placing the monopile foundation 210 for an offshore wind turbine jacked up by this jacking-up step and the first installation base S2, which is the yard installation base, on the skid beam.

[0093] In this modification 2-1, the offshore wind turbine monopile foundation 210, which is an offshore structure, and the first installation base S2, which is a yard installation base, can be moved from the yard Y to the ship B more reliably using a skid beam.

[0094] <Variation 2-2> In addition to using a transport cart to move the monopile foundation 210 for an offshore wind turbine together with the first installation stand S2 from yard Y to ship B as in the second embodiment, or using a skid beam to move the monopile foundation 210 for an offshore wind turbine together with the first installation stand S2 from yard Y to ship B as in variant example 2-1, an installation stand system and transportation method related to variant example 2-2 can also be achieved by using a crane to move the monopile foundation 210 for an offshore wind turbine together with the first installation stand S2 from yard Y to ship B, and then placing the monopile foundation 210 for an offshore wind turbine in a predetermined mounting position similar to that of the second embodiment on ship B via the same first installation stand S2.

[0095] <Variation 2-3> The installation base system and moving method according to the second embodiment, modified example 2-1, and modified example 2-2 have been described as a case in which the monopile foundation 210 for an offshore wind turbine is moved together with the first installation base S2 from the yard Y to the ship B, and the monopile foundation 210 for an offshore wind turbine is then placed and fixed on the ship B via the same first installation base S2. In contrast, the installation base system and moving method according to modified example 2-3 uses a first installation base S2 that has a common configuration with the first installation base S2, which is a yard installation base, but is different from the first installation base S2, which is a yard installation base, as the shipboard installation base.

[0096] In this case, the moving method includes a placement step and an installation step. The placement step is a step of placing the first installation base S2, which is a shipboard installation base, on the ship B. The installation step is a step of transferring the offshore wind turbine monopile foundation 210 from the first installation base S2, which is a yard installation base, to the first installation base S2 placed on the ship B in the placement step and installing it.

[0097] In the placement step, for example, it is preferable that the first installation stand S2, which is an on-board installation stand, is placed on the ship B so as to straddle at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below. That is, it is preferable that the first installation stand S2 is placed on the ship B so as to straddle at least two beams, at least two walls, or at least one beam and at least one wall.

[0098] In the installation step, for example, in yard Y, the offshore wind turbine monopile foundation 210 is removed from the first installation base S2, which is a yard installation base, and transported onto ship B using a crane, a transport vehicle, a skid beam, or the like. Then, using a crane or the like, the offshore wind turbine monopile foundation 210 is installed on the first installation base S2, which is an onboard installation base that was installed on ship B in advance in the arrangement step. Also, for example, the offshore wind turbine monopile foundation 210 together with the first installation base S2, which is a yard installation base, is moved onto ship B from yard Y using a crane, a transport vehicle, a skid beam, or the like, and once on ship B, the offshore wind turbine monopile foundation 210 is removed from the first installation base S2, which is a yard installation base, and then, using a crane or the like, the offshore wind turbine monopile foundation 210 is installed on the first installation base S2, which is an onboard installation base that was installed on ship B in the arrangement step. Even with this configuration, it is possible to use the first installation stand S2 with a common configuration on both the yard Y and the ship B, thereby reducing costs compared to using installation stands with different configurations on both the yard Y and the ship B. Note that a first installation stand S2 that has a common configuration with the first installation stand S2 that is the yard installation stand and is separate from the first installation stand S2 that is the yard installation stand does not have to be used as the shipboard installation stand.

[0099] <Variation 2-4> The installation table system and movement method according to Modification 2-3 have been described using an example in which the first installation table S2, which is a yard installation table, and the first installation table S2, which is a shipboard installation table, have a common configuration but are prepared separately. In contrast, in the installation table system and movement method according to Modification 2-4, the first installation table S2, which is a yard installation table, and the second installation table S2, which is a shipboard installation table, have different configurations. It is preferable that the second installation table, which is a shipboard installation table, be made of steel as well.

[0100] For example, if the first installation stand S2, which is a yard installation stand, is not suitable for use as a shipboard installation stand, a second installation stand different from the first installation stand S2 is used as the shipboard installation stand. In this case, it is preferable to make the leg portion S2a, which is the framework, common between the first installation stand S2 and the second installation stand. In this way, by making the leg portion S2a, which is the framework of the first installation stand S2, which is a yard installation stand, and the leg portion, which is the framework of the second installation stand, which is a shipboard installation stand, common, it becomes possible to facilitate the manufacture and handling of each. Furthermore, if the leg portion S2a, which is the framework, is common between the first installation stand S2 and the second installation stand, shaped steel can also be used for the second installation stand, which is a shipboard installation stand, and this makes it easier to manufacture both the first installation stand S2, which is a yard installation stand, and the second installation stand, which is a shipboard installation stand.

[0101] In this case, the moving method includes an arrangement step of placing a second installation base, which is a shipboard installation base, on ship B, and an installation step of installing a monopile foundation 210 for an offshore wind turbine, which is a marine structure, on the first installation base S2, which is a yard installation base, on the second installation base, which is a shipboard installation base, placed in the arrangement step.

[0102] In the arranging step, the second installation stand, which is an on-board installation stand, is preferably placed on the ship B so as to span at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below. That is, the second installation stand is preferably placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0103] In the installation step, for example, in yard Y, the offshore wind turbine monopile foundation 210 is removed from the first installation base S2, which is a yard installation base, and transported onto ship B using a crane, a transport vehicle, a skid beam, or the like. Then, using a crane or the like, the offshore wind turbine monopile foundation 210 is installed on the second installation base, which is an onboard installation base, which was installed on ship B in advance in the arrangement step. Also, for example, the offshore wind turbine monopile foundation 210 together with the first installation base S2, which is a yard installation base, is moved onto ship B from yard Y using a crane, a transport vehicle, a skid beam, or the like, and once on ship B, the offshore wind turbine monopile foundation 210 is removed from the first installation base S2, which is a yard installation base, and then, using a crane or the like, the offshore wind turbine monopile foundation 210 is installed on the second installation base, which is an onboard installation base, which was installed on ship B in advance in the arrangement step. The leg S2a, which is the framework of the first installation stand S2, which is the installation stand for the yard, and the leg S2a, which is the framework of the second installation stand, which is the installation stand for the ship, do not have to be common.

[0104] <Variation 2-5> In the installation table system and movement method according to Modification 2-4, the first installation table S2, which is a yard installation table, and the second installation table, which is a shipboard installation table, are different in configuration but share a common framework, such as the legs S2a. In contrast, in the installation table system and movement method according to Modification 2-5, the first installation table S2, which is a yard installation table, and the second installation table, which is a shipboard installation table, are different in configuration from the framework.

[0105] For example, the first installation base S2, which is a yard installation base, is desired to be small in size because it is sufficient to distribute the load of the offshore wind turbine monopile foundation 210, which is an offshore structure, to the sturdy yard Y. In contrast, the second installation base, which is a shipboard installation base, is desired to be sized so that it can straddle multiple deck support members of the ship B because the strength of the deck B1 of the ship B varies depending on the location. If the first installation base S2, which is a yard installation base, is smaller than this size, the framework of the second installation base, which is a shipboard installation base, will be larger than the leg S2a, which is the framework of the first installation base S2, which is a yard installation base. In this way, by differentiating the frameworks of the first installation base S2, which is a yard installation base, and the second installation base, which is a shipboard installation base, it is possible to prepare appropriate ones for each. In this case, it is also preferable that the second installation base, which is a shipboard installation base, be made of steel. Moreover, it is also preferable to use shaped steel for the second installation base, which is a shipboard installation base. By using shaped steel, it becomes easy to manufacture the first installation stand S2, which is an installation stand for the yard, and the second installation stand, which is an installation stand for onboard use.

[0106] The movement method in this case is also the same as the movement method in Modification Example 2-4. In this case, too, it is preferable that the second installation base, which is an on-board installation base, be placed on the ship B so as to span at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. In other words, it is preferable that the second installation base be placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall. The first installation base S2, which is the installation base for the yard, and the second installation base, which is the installation base for the ship, do not need to have different configurations in terms of their frameworks.

[0107] [Third embodiment] Next, an installation stand system and a movement method according to a third embodiment of the present disclosure will be described, focusing on differences from the second embodiment, mainly with reference to FIG. FIG. 13 is a plan view schematically showing a first installation stand S3 used in an installation stand system 300 according to the third embodiment.

[0108] The installation base system and moving method according to the third embodiment (as well as the installation base systems and moving methods according to variants 3-1 to 3-5 described below) also target a monopile foundation 210 for an offshore wind turbine that supports an offshore wind turbine as an offshore structure.

[0109] The installation base system 300 according to the third embodiment includes a yard installation base on which the foundation of the offshore wind turbine monopile foundation 210 is installed and which is placed in a yard, and a shipboard installation base on which the foundation of the offshore wind turbine monopile foundation 210 is installed and which is placed on a ship. Both the yard installation base and the shipboard installation base are installed with the offshore wind turbine monopile foundation 210 standing. In the installation base system 300 according to the third embodiment, the yard installation base and the shipboard installation base are the same, in other words, identical, and are the first installation base S3 as shown in FIG. 13. Note that the first installation base S3 which is the yard installation base and the first installation base S3 which is the shipboard installation base do not have to be the same.

[0110] The first installation base S3 has a lower framework S3a that is placed on the ground Y1 of the yard Y and the deck B1 of the ship B, and an upper installation section (not shown) on which the monopile foundation 210 for the offshore wind turbine is installed in an upright position.

[0111] The frame S3a includes a beam S3a1. The frame S3a includes a plurality of beams S3a1. The frame S3a has a plurality of beams S3a1 arranged, for example, to form a cross shape as a whole in a plan view. The plurality of beams S3a1 are made of steel, and may be, for example, known shaped steel such as H-beams or I-beams including a lower flange, an upper flange, and a web. In this case, the lower flange is flat and extends horizontally in one direction. The web is flat and extends in the same direction as the lower flange, rising vertically upward from the center of the lower flange's short side. The upper flange is flat and extends horizontally in the same direction as the lower flange, and the upper edge of the web is connected to the center of the short side. When known shaped steel beams such as H-shaped steel or I-shaped steel beams are used, the upper flanges of the multiple beams S3a1 are welded together so that they are positioned on the same plane, the webs are welded together so that they are positioned on the same plane, and the lower flanges are welded together so that they are positioned on the same plane, forming a cross shape in plan view as a whole. The first installation stand S3 is made of steel and uses shaped steel beams. The first installation stand S3, which serves as both the yard installation stand and the shipboard installation stand, does not have to be made of steel. Furthermore, the first installation stand S3, which serves as both the yard installation stand and the shipboard installation stand, does not necessarily need to be made of structural steel.

[0112] The monopile foundation 210 for an offshore wind turbine is installed in an upright state on the first installation base S3, with its lower end sill being installed on an installation portion (not shown). At this time, the sill that is the lower end of the monopile foundation 210 for an offshore wind turbine is arranged so as to straddle all of the beams S3a1 of the framework S3a in a plan view, as shown in FIG. 13 . Furthermore, the sill that is the lower end of the monopile foundation 210 for an offshore wind turbine is arranged so that the intersections of all of the beams S3a1 are located radially inward in a plan view. Note that the sill that is the lower end of the monopile foundation 210 for an offshore wind turbine does not have to be arranged so as to straddle all of the beams S3a1 of the framework S3a in a plan view. Furthermore, the beams S3a1 may be arranged in a cross shape or a grid pattern, and any arrangement is acceptable as long as they can support the monopile foundation 210 for an offshore wind turbine.

[0113] In the moving method according to the third embodiment, a first installation base S3 constituting a yard installation base to be placed in a yard Y on which an offshore wind turbine monopile foundation 210, which is an offshore structure, is installed is transported onto a ship B by a transport vehicle with the offshore wind turbine monopile foundation 210 installed, and is placed at a predetermined mounting position on the ship B with the offshore wind turbine monopile foundation 210 still installed. As a result, the first installation base S3 constituting the yard installation base constitutes an on-ship installation base on which the offshore wind turbine monopile foundation 210, which is an offshore structure, is installed and placed on the ship B. Therefore, the installation base system 300 according to the third embodiment includes the first installation base S3 that serves as both a yard installation base and an on-ship installation base. The moving method according to the third embodiment also includes a moving step of moving the offshore wind turbine monopile foundation 210, which is an offshore structure, onto the ship B together with the first installation base S3, which is a yard installation base. In this case, too, it is preferable that the first installation stand S3, which is an on-board installation stand, be placed on the ship B so as to span at least two or more of the plurality of beams and the plurality of walls, which are deck support members that support the deck B1 from below. In other words, it is preferable that the first installation stand S3 be placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0114] The first installation base S3, which can be used as both a yard installation base and a shipboard installation base, is the same as the first installation base S3 as a yard installation base and the first installation base S3 as a shipboard installation base, and naturally the lower framework S3a is the same.

[0115] The installation stand system 300 and the movement method according to the third embodiment described above each have the same effects as those of the second embodiment. Furthermore, the first installation base S3, which serves as both a yard installation base and a shipboard installation base, on which the erected offshore wind turbine monopile foundation 210 is installed, includes beams S3a1, so that the erected offshore wind turbine monopile foundation 210 can be reliably supported by both the first installation base S3, which is a yard installation base, and the first installation base S3, which is a shipboard installation base. The first installation base S3, which serves as both a yard installation base and a shipboard installation base, does not need to include beams S3a1.

[0116] The installation stand system 300 and the movement method according to the third embodiment described above can be modified as in the following Modifications 3-1 to 3-5. Modifications 3-1 to 3-5 can also be combined as appropriate.

[0117] <Variation 3-1> The installation base system 300 and the moving method according to the third embodiment have been described as a case in which the offshore wind turbine monopile foundation 210 is moved together with the first installation base S3 from the yard Y to the ship B using a transport vehicle, and then the offshore wind turbine monopile foundation 210 is mounted and fixed to the ship B via the same first installation base S3. In contrast, in the installation base system and the moving method according to the modified example 3-1, the offshore wind turbine monopile foundation 210 is moved together with the first installation base S3 from the yard Y to the ship B using a skid beam (not shown), and then the offshore wind turbine monopile foundation 210 is mounted and fixed to the ship B via the same first installation base S3.

[0118] In this case, for example, a laying step is performed in which a skid beam is laid from the yard Y onto the ship B. In the laying step, the beam of the skid beam may be laid from the yard Y onto the ship B below a first installation stand S3 that is provided in the yard Y and on which the monopile foundation for an offshore wind turbine 210 is placed. Then, a jacking-up step is performed in which the monopile foundation for an offshore wind turbine 210 is jacked up together with the first installation stand S3. Then, a placing step is performed in which the monopile foundation for an offshore wind turbine 210 is jacked down together with the first installation stand S3 on the skid beam. Then, the monopile foundation for an offshore wind turbine 210 is placed on the skid beam together with the first installation stand S3. In this state, the monopile foundation 210 for an offshore wind turbine is slid along the skid beam together with the first installation base S3, thereby performing a transfer step in which the monopile foundation 210 for an offshore wind turbine together with the first installation base S3 on which it is placed is moved onto the ship B. In this way, the monopile foundation 210 for an offshore wind turbine together with the first installation base S3 is positioned vertically above the predetermined installation position similar to that of the third embodiment. Then, the monopile foundation 210 for an offshore wind turbine together with the first installation base S3 is jacked up. After that, the skid beam is removed, and the monopile foundation 210 for an offshore wind turbine together with the first installation base S3 is jacked down and placed in the predetermined installation position similar to that of the third embodiment, performing an installation step. Then, the first installation base S3 is fixed to the ship B. Here, the movement of the offshore wind turbine monopile foundation 210 on the skid beam may be by being pushed from the yard Y side to the ship B side, or by being towed from the yard Y side to the ship B side. Note that there are cases where the skid beam is not removed from the ship B.

[0119] The above is the moving step of using a skid beam to move the monopile foundation 210 for an offshore wind turbine, which is an offshore structure, onto the ship B together with the first installation base S3 that was being used for the yard. The moving step in this case includes a jacking-up step of jacking up the monopile foundation 210 for an offshore wind turbine, which is an offshore structure, together with the first installation base S3, which is the yard installation base, and a placing step of placing the monopile foundation 210 for an offshore wind turbine jacked up by this jacking-up step and the first installation base S3, which is the yard installation base, on the skid beam.

[0120] In this modification 3-1, the offshore wind turbine monopile foundation 210, which is an offshore structure, and the first installation base S3, which is a yard installation base, can be moved from the yard Y to the ship B more reliably using a skid beam.

[0121] <Variation 3-2> In addition to using a transport vehicle to move the monopile foundation 210 for an offshore wind turbine together with the first installation stand S3 from yard Y to ship B as in the third embodiment, or using a skid beam to move the monopile foundation 210 for an offshore wind turbine together with the first installation stand S3 from yard Y to ship B as in variant example 3-1, an installation stand system and moving method related to variant example 3-2 can also be achieved by using a crane to move the monopile foundation 210 for an offshore wind turbine together with the first installation stand S3 from yard Y to ship B, and then placing the monopile foundation 210 for an offshore wind turbine in a predetermined mounting position similar to that of the third embodiment on ship B via the same first installation stand S3.

[0122] <Variation 3-3> The installation base system and moving method according to the third embodiment, modified example 3-1, and modified example 3-2 have been described as a case in which the monopile foundation 210 for an offshore wind turbine is moved together with the first installation base S3 from the yard Y to the ship B, and the monopile foundation 210 for an offshore wind turbine is then placed and fixed on the ship B via the same first installation base S3. In contrast, the installation base system and moving method according to modified example 3-3 uses a first installation base S3 that has a common configuration with the first installation base S3, which is a yard installation base, but is different from the first installation base S3, which is the yard installation base, as the shipboard installation base.

[0123] In this case, the moving method includes an arrangement step of placing the first installation stand S3, which is an on-board installation stand, on the ship B, and an installation step of installing the monopile foundation 210 for an offshore wind turbine, which is an offshore structure, to be installed on the first installation stand S3, which is a yard installation stand, on the first installation stand S3, which is an on-board installation stand, which is placed in the arrangement step.

[0124] In the placement step, for example, it is preferable that the first installation stand S3, which is an on-board installation stand, is placed on the ship B so as to straddle at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below. That is, it is preferable that the first installation stand S3 is placed on the ship B so as to straddle at least two beams, at least two walls, or at least one beam and at least one wall.

[0125] In the installation step, for example, in yard Y, the offshore wind turbine monopile foundation 210 is removed from the first installation stand S3, which is a yard installation stand, and transported onto ship B using a crane, a transport vehicle, a skid beam, or the like. Then, using a crane, or the like, the offshore wind turbine monopile foundation 210 is installed on the first installation stand S3, which is an onboard installation stand that was installed on ship B in advance in the arrangement step. Also, for example, the offshore wind turbine monopile foundation 210 together with the first installation stand S3, which is a yard installation stand, is moved onto ship B from yard Y using a crane, a transport vehicle, a skid beam, or the like, and once on ship B, the offshore wind turbine monopile foundation 210 is removed from the first installation stand S3, which is a yard installation stand, and then, using a crane, or the like, the offshore wind turbine monopile foundation 210 is installed on the second installation stand, which is an onboard installation stand that was installed on ship B in advance in the arrangement step. Even with this configuration, it is possible to use a first installation stand S3 with a common configuration on both yard Y and ship B, thereby reducing costs compared to using installation stands with different configurations on both yard Y and ship B. In addition, the first installation stand S3, which has a common configuration with the first installation stand S3 that is the yard installation stand and is different from the first installation stand S3 that is the yard installation stand, does not have to be used as the shipboard installation stand.

[0126] <Variation 3-4> The installation table system and movement method according to Modification 3-3 have been described using an example in which the first installation table S3, which is a yard installation table, and the first installation table S3, which is a shipboard installation table, have a common configuration but are prepared separately. In contrast, in the installation table system and movement method according to Modification 3-4, the first installation table S3, which is a yard installation table, and the second installation table S3, which is a shipboard installation table, have different configurations. It is preferable that the second installation table, which is a shipboard installation table, be made of steel as well.

[0127] For example, if the first installation stand S3, which is a yard installation stand, is not suitable for use as a shipboard installation stand, a second installation stand different from the first installation stand S3 is used as the shipboard installation stand. In this case, it is preferable to use the same framework S3a for the first installation stand S3 and the second installation stand. In this way, by using a common framework S3a for the first installation stand S3, which is a yard installation stand, and the same framework for the second installation stand, which is a shipboard installation stand, it becomes possible to facilitate the manufacture and handling of each. Furthermore, if the framework S3a is common for the first installation stand S3 and the second installation stand, shaped steel will also be used for the third installation stand, which is a shipboard installation stand, and this will facilitate the manufacture of both the first installation stand S3, which is a yard installation stand, and the second installation stand, which is a shipboard installation stand.

[0128] In this case, the moving method includes an arrangement step of placing a second installation base, which is a shipboard installation base, on ship B, and an installation step of installing a monopile foundation 210 for an offshore wind turbine, which is a marine structure, on the first installation base S3, which is a yard installation base, on the second installation base, which is a shipboard installation base, placed in the arrangement step.

[0129] In the arranging step, the second installation stand, which is an on-board installation stand, is preferably placed on the ship B so as to span at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below. That is, the second installation stand is preferably placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0130] In the installation step, for example, in yard Y, the offshore wind turbine monopile foundation 210 is removed from the first installation base S3, which is a yard installation base, and the offshore wind turbine monopile foundation 210 is transported onto ship B using a crane, a transport vehicle, a skid beam, or the like. Then, a second installation base, which is an on-board installation base that was previously installed on ship B in the arranging step, is installed on the offshore wind turbine monopile foundation 210 using a crane, a transport vehicle, a skid beam, or the like. Also, for example, the offshore wind turbine monopile foundation 210 is moved from yard Y onto ship B together with the first installation base S3, which is a yard installation base, using a crane, a transport vehicle, a skid beam, or the like, and once on ship B, the offshore wind turbine monopile foundation 210 is removed from the first installation base S3, which is a yard installation base, and the offshore wind turbine monopile foundation 210 is installed onto the second installation base, which is an on-board installation base that was previously installed on ship B in the arranging step, using a crane, or the like. The framework S3a of the first installation base S3, which is the installation base for the yard, and the framework of the second installation base, which is the installation base for the ship, do not have to be the same.

[0131] <Variation 3-5> In the installation table system and movement method according to Modification 3-4, the first installation table S3, which is a yard installation table, and the second installation table, which is a shipboard installation table, are configured differently but share the same framework S3a. In contrast, in the installation table system and movement method according to Modification 3-5, the framework S3a of the first installation table S3, which is a yard installation table, is different from the framework of the second installation table, which is a shipboard installation table.

[0132] For example, the first installation base S3, which is a yard installation base, is desired to be small in size because it is sufficient to distribute the load of the offshore wind turbine monopile foundation 210, which is an offshore structure, to the sturdy yard Y. In contrast, the second installation base, which is a shipboard installation base, is desired to be sized so that it can straddle multiple deck support members of the ship B because the strength of the deck B1 of the ship B varies depending on the location. If the first installation base S3, which is a yard installation base, is smaller than this size, the framework of the second installation base, which is a shipboard installation base, will be larger than the framework S3a of the first installation base S3, which is a yard installation base. In this way, by differentiating the frameworks of the first installation base S3, which is a yard installation base, and the second installation base, which is a shipboard installation base, it is possible to prepare appropriate ones for each. In this case, it is preferable that the second installation base, which is a shipboard installation base, is also made of steel. Moreover, it is preferable that shaped steel be used for the second installation base, which is a shipboard installation base. By using shaped steel, it becomes easy to manufacture the first installation stand S3, which is an installation stand for the yard, and the second installation stand, which is an installation stand for onboard use.

[0133] The movement method in this case is also the same as the movement method in Modification Example 3-4. In this case, too, it is preferable that the second installation base, which is an on-board installation base, be placed on the ship B so as to span at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. In other words, it is preferable that the second installation base be placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall. The first installation base S3, which is the installation base for the yard, and the second installation base, which is the installation base for the ship, do not need to have different configurations in terms of their frameworks.

[0134] [Fourth embodiment] Next, an installation stand system and a movement method according to a first embodiment of the present disclosure will be described, focusing on differences from the first embodiment, mainly with reference to FIG. FIG. 14 is a side view schematically showing an installation stand system 400 according to the fourth embodiment.

[0135] The installation base system 400 and the moving method according to the fourth embodiment (the same applies to the installation base systems and moving methods according to Modifications 4-1 to 4-6 described later) are targeted at a jacket-type structure 410 as an offshore structure. Examples of the jacket-type structure 410 include a jacket-type structure used as a pier, a jacket-type structure for an oil-related facility, and a jacket-type structure for a gas-related facility. The jacket-type structure 410 includes a plurality of legs 41 (foundations) extending vertically and arranged at grid intersections in a plan view, and an upper girder 42 that connects and integrates the upper portions of the legs 41. The plurality of legs 41 and the upper girder 42 are made of steel. The jacket-type structure 410 is supported by steel pipe piles (not shown) driven into the seabed, with each of the legs 41 being inserted into or inserted into the steel pipe piles. The jacket-type structure 410 is installed, for example, on the sea side of a harbor quay so as to extend perpendicular to the quay. Here, the seabed where the jacket-type structure 410 is installed, for example, near a quay, becomes shallower the closer it is to the quay, and accordingly, the length of the legs 41 of the jacket-type structure 410 becomes shorter the closer it is to the quay.

[0136] For the sake of efficiency in manufacturing and transportation, the jacket-type structure 410 has temporary legs 43 abutted or connected to the underside of the legs 41 as necessary so that the combined length of the legs 41 and the temporary legs 43 is the same for all legs 41. These temporary legs 43 are removed before the legs 41 are inserted into or inserted into the steel pipe piles. The temporary legs 43 are made of steel.

[0137] The installation stand system 400 according to the fourth embodiment includes a yard installation stand placed in a yard Y, on which each of the multiple legs 41 of the jacket-type structure 410 is installed directly or via a temporary leg 43, and an on-board installation stand placed on a ship, on which each of the multiple legs 41 of the jacket-type structure 410 is installed directly or via a temporary leg 43. In the installation stand system 400 according to the fourth embodiment, the yard installation stand and the on-board installation stand are the same, in other words, identical, and form a first installation stand S4. The legs 41 are installed on the first installation stand S4 directly or via the temporary legs 43.

[0138] The first installation stand S4 is preferably made of known shaped steel such as H-beam or I-beam. The first installation stand S4 is made of steel.

[0139] When the jacket-type structure 410 assembled in the yard Y is to be moved to the ship B for transport, each of the multiple legs 41 together with the first installation stand S4 is jacked up by a transport cart on the ground Y1 of the yard Y as described above, and the transport cart is made to travel, thereby moving the entire jacket-type structure 410 as it is onto the deck B1 of the ship B. At this time, a transfer plate (not shown) on which each transport cart can travel is appropriately installed between the ground Y1 of the yard Y and the deck B1 of the ship B.

[0140] Then, the jacket-type structure 410 moved onto the deck B1 of the ship B is positioned at a predetermined installation position. That is, each of the multiple legs 41 is transported on the deck B1 of the ship B together with the first installation platform S4 by a transport cart and positioned vertically above each predetermined installation position. Then, each of the multiple legs 41 is simultaneously jacked down by the transport cart. Then, the first installation platform S4, on which each of the multiple legs 41 is installed directly or via a temporary leg 43, is placed at a predetermined installation position on the deck B1. At this time, all of the first installation platforms S4 are placed on the ship B so that they straddle at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. That is, the first installation base S4 is placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall. Then, the multiple first installation bases S4 placed at predetermined placement positions on the deck B1 are each appropriately fixed to the deck B1.

[0141] The above is the moving step of moving the jacket-type structure 410, which is an offshore structure, onto the ship B together with the first installation stand S4 that has been used for the yard Y. When the jacket-type structure 410 is jacked down on the ship B, the transport vehicle moves from the ship B to the yard Y side, for example.

[0142] Then, with the jacket-type structure 410 installed on the ship B via the first installation stands S4, each of all of the first installation stands S4 is appropriately fixed to the deck B1 of the ship B. The ship B with the jacket-type structure 410 loaded thereon via the first installation stands S4 is transported, for example, to an installation site. Then, at the installation site, the jacket-type structure 410 is removed from the first installation stands S4 or removed from the temporary legs 43 and installed at the installation site by, for example, a crane or the like.

[0143] As described above, the fourth embodiment installation stand system 400 on which the jacket-type structure 410 is installed includes a first installation stand S4 on which the leg 41, which is the base of the jacket-type structure 410, is installed directly or via a temporary leg 43.

[0144] In addition, in this installation base system 400, the first installation base S4 serves both as a yard installation base placed in yard Y and as an on-board installation base placed on ship B. In other words, this installation base system 400 includes the first installation base S4, which is a yard installation base placed in yard Y, on which the legs 41, which are the bases of the jacket-type structure 410, are installed directly or via temporary legs 43. In addition, this installation base system 400 includes the first installation base S4, which is an on-board installation base placed on ship B, on which the legs 41, which are the bases of the jacket-type structure 410, are installed.

[0145] Furthermore, in this installation base system 400, the first installation base S4, which is a yard installation base, and the first installation base S4, which is a shipboard installation base, are the same. Therefore, in this installation base system 400, the framework of the first installation base S4, which is a yard installation base, and the framework of the first installation base S4, which is a shipboard installation base, are common.

[0146] In addition, in this installation base system 400, the first installation base S4, which serves as both the yard installation base and the shipboard installation base, is made of steel. In addition, in this installation base system 400, the first installation base S4, which serves as both the yard installation base and the shipboard installation base, uses shaped steel such as H-beam or I-beam.

[0147] Furthermore, this installation base system 400 is placed on the ship B so that the first installation base S4, which serves as the shipboard installation base, spans at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. In other words, the first installation base S4 is placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0148] As described above, the installation base system 400 according to the fourth embodiment includes the first installation base S4, which is a yard installation base placed in the yard Y, on which the legs 41, which are the bases of the jacket-type structure 410, are installed directly or via temporary legs 43. The installation base system 400 also includes the first installation base S4, which is a shipboard installation base placed on the ship B, on which the legs 41, which are the bases of the jacket-type structure 410, are installed directly or via temporary legs 43. Therefore, the installation base system 400 makes it possible to install the legs 41, which are the bases of the jacket-type structure 410, which is an offshore structure, on both the yard Y and the ship B. Furthermore, in this installation base system 400, the legs 41, which are the bases of the jacket-type structure 410, are installed, and the first installation base S4, which is a yard installation base placed in the yard Y, is made of steel. Therefore, in this installation base system 400, by making the first installation base S4, which is a yard installation base, out of steel, the weight of the first installation base S4, which is a yard installation base, is lighter than when the first installation base S4, which is a yard installation base, is made of concrete.

[0149] Furthermore, in this installation platform system 400, the first installation platform S4, which is the yard installation platform, and the first installation platform S4, which is the shipboard installation platform, are the same, i.e., identical. Therefore, this installation platform system 400 can use the same first installation platform S4 on both the yard Y and the ship B. This makes it possible to reduce the number of first installation platforms S4 used, and also eliminates the need to transfer the jacket-type structure 410 from the yard installation platform to the shipboard installation platform, thereby achieving significant cost reductions. Note that the first installation platform S4, which is the yard installation platform, and the first installation platform S4, which is the shipboard installation platform, do not have to be the same.

[0150] Furthermore, in this installation base system 400, the first installation base S4, which serves as both a yard installation base and a shipboard installation base, is made of steel. This makes it easier to manufacture the first installation base S4, which serves as both a yard installation base and a shipboard installation base, in this installation base system 400, thereby reducing costs. However, the first installation base S4, which serves as both a yard installation base and a shipboard installation base, does not have to be made of steel.

[0151] Furthermore, in this installation base system 400, shaped steel is used for the first installation base S4, which serves as both a yard installation base and a shipboard installation base. Therefore, in this installation base system 400, the first installation base S4, which serves as both a yard installation base and a shipboard installation base, can be easily manufactured, thereby reducing costs. Here, since the jacket-type structure 410 has a large number of legs 41, the load borne by each leg 41 is small. Therefore, shaped steel can be effectively used for the first installation base S4. However, shaped steel does not have to be used for the first installation base S4, which serves as both a yard installation base and a shipboard installation base.

[0152] Furthermore, this installation base system 400 is placed on the ship B so that the first installation base S4, which serves as the shipboard installation base, spans at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. In other words, the first installation base S4 is placed on the ship B so that it spans at least two beams, at least two walls, or at least one beam and at least one wall. For this reason, this installation base system 400 can be reliably placed on the ship B even if what is installed on the first installation base S4, which serves as the shipboard installation base, is a jacket-type structure 410.

[0153] Moreover, the moving method according to the fourth embodiment includes a moving step of moving the jacket-type structure 410, which is an offshore structure, onto the ship B together with the first installation stand S4 that was used for the yard Y. In this moving method, since the yard installation stand and the shipboard installation stand are the same first installation stand S4, it is possible to eliminate the need to transfer the jacket-type structure 410 from the yard installation stand to the shipboard installation stand when moving the jacket-type structure 410 from the yard Y onto the ship B. Furthermore, since the first installation stand S4, which is the yard installation stand, is made of steel, the first installation stand S4, which is the yard installation stand, is relatively light, and it becomes possible to easily move the jacket-type structure 410 together with the first installation stand S4, which is the yard installation stand.

[0154] The installation stand system 400 and the movement method according to the fourth embodiment described above can be modified as in the following Modifications 4-1 to 4-6. Modifications 4-1 to 4-6 can also be combined as appropriate.

[0155] <Variation 4-1> The installation stand system 400 and the movement method according to the fourth embodiment have been described as a case in which the jacket-type structure 410 is moved together with the first installation stand S4 from the yard Y to the ship B using a transport vehicle, and the jacket-type structure 410 is then mounted and fixed on the ship B via the same first installation stand S4. In contrast, in the installation stand system and the movement method according to the modified example 4-1, the jacket-type structure 410 is moved together with the first installation stand S4 from the yard Y to the ship B using a skid beam (not shown), and the jacket-type structure 410 is then mounted and fixed on the ship B via the same first installation stand S1.

[0156] In this case, for example, a laying step is performed in which a skid beam is laid from the yard Y to the top of the ship B. In the laying step, the skid beam may be laid from the yard Y to the top of the ship B below a first installation stand S4 that is provided in the yard Y and on which each of the multiple legs 41 of the jacket-type structure 410 is placed, either directly or via temporary legs 43. Thereafter, a jacking-up step is performed in which the multiple legs 41 of the jacket-type structure 410 are jacked up together with the first installation stands S4 on which they are placed, thereby jacking up the entire jacket-type structure 410. Thereafter, a placement step is performed in which the multiple legs 41 of the jacket-type structure 410 are jacked down together with the first installation stands S4 on which they are placed, on the skid beam. Then, the multiple legs 41 of the jacket-type structure 410 are placed on the skid beam together with the first installation stands S4 on which they are placed. In this state, the multiple legs 41 of the jacket-type structure 410, together with the first installation base S4 on which they are placed, are slid and moved on the skid beam, thereby performing a transfer step in which the jacket-type structure 410, together with the first installation base S4 on which they are placed, is moved onto the ship B. In this way, the jacket-type structure 410, together with the first installation base S4, is positioned vertically above a predetermined installation position similar to that of the fourth embodiment. Then, the jacket-type structure 410 is jacked up together with the first installation base S4. Thereafter, the skid beam is removed, and the multiple legs 41 of the jacket-type structure 410, together with the first installation base S4 on which they are placed, are jacked down, and a installation step is performed in which they are placed at a predetermined installation position similar to that of the fourth embodiment. Then, the first installation bases S4 are each fixed to the ship B. Here, in the case of the skid beam, the jacket-type structure 410 may be moved by being pushed from the yard Y side to the ship B side, or by being towed from the yard Y side to the ship B side. Note that there are cases where the skid beam is not removed from the ship B.

[0157] The above is the moving step of using the skid beam to move the jacket-type structure 410, which is an offshore structure, onto the ship B together with the first installation stand S4 that was used for the yard Y. The moving step in this case includes a jacking-up step of jacking up the jacket-type structure 410, which is an offshore structure, together with the first installation stand S4, which is a yard installation stand, and a placing step of placing the jacket-type structure 410 jacked up by this jacking-up step and the first installation stand S4, which is a yard installation stand, on the skid beam.

[0158] In this modified example 4-1, the jacket-type structure 410, which is an offshore structure, and the first installation stand S4, which is a yard installation stand, can be moved from the yard Y to the ship B more reliably using a skid beam.

[0159] <Variation 4-2> In addition to using a transport cart to move the jacket-type structure 410 together with the first installation stand S4 from the yard Y to the ship B as in the fourth embodiment, or using a skid beam (not shown) to move the jacket-type structure 410 together with the first installation stand S4 from the yard Y to the ship B as in variant example 4-1, as an installation stand system and moving method related to variant example 4-2, it is also possible to use a crane (not shown) to move the jacket-type structure 410 together with the first installation stand S4 from the yard Y onto the ship B, and then place it on the ship B via the same first installation stand S4 at a predetermined mounting position similar to that in the fourth embodiment.

[0160] <Modification 4-3> The installation base system and movement method according to the fourth embodiment, modified example 4-1, and modified example 4-2 have been described as a case where the jacket-type structure 410 is moved from the yard Y to the ship B together with the first installation base S4, and the jacket-type structure 410 is then placed and fixed on the ship B via the same first installation base S4. In contrast, the installation base system and movement method according to modified example 4-3 uses a first installation base S4 that has a common configuration with the first installation base S4, which is the yard installation base, and is different from the first installation base S4, which is the yard installation base, as the shipboard installation base.

[0161] In this case, the moving method includes an arrangement step of placing the first installation stand S4, which is an on-board installation stand, on the ship B, and an installation step of installing the jacket-type structure 410, which is an offshore structure to be installed on the first installation stand S4, which is a yard installation stand, on the first installation stand S4, which is an on-board installation stand, which is placed in the arrangement step.

[0162] In the placement step, the first installation stand S4, which is an on-board installation stand, is preferably placed on the ship B so as to straddle at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below, as in the fourth embodiment. That is, the first installation stand S4 is preferably placed on the ship B so as to straddle at least two beams, at least two walls, or at least one beam and at least one wall.

[0163] In the installation step, for example, in the yard Y, the jacket-type structure 410 is removed from the first installation stand S4, which is a yard installation stand, and the jacket-type structure 410 is transported onto the ship B using a crane, a transport vehicle, a skid beam, or the like. Then, using a crane or the like, the legs 41 of the jacket-type structure 410 are installed directly or via temporary legs 43 on each of the first installation stands S4, which are shipboard installation stands that were installed on the ship B in advance in the placement step. Also, for example, the jacket-type structure 410 together with the first installation stand S4, which is a yard installation stand, is moved from yard Y onto ship B using a crane, transport cart, skid beam, etc., and once on ship B, the jacket-type structure 410 is removed from the first installation stand S4, which is a yard installation stand, and using a crane, etc., the legs 41 of the jacket-type structure 410 are installed directly or via temporary legs 43 on each of the first installation stands S4, which are shipboard installation stands that were previously installed on ship B in the placement step.

[0164] Even with this configuration, it is possible to use a first installation stand S4 with a common configuration on both yard Y and ship B, thereby reducing costs compared to using installation stands with different configurations on both yard Y and ship B.

[0165] Furthermore, for example, the first installation base S4 which is a yard installation base and the first installation base S4 which is a shipboard installation base, on which one leg 41 of the jacket-type structure 410 is installed, can have a simple structure and can be manufactured at low cost because they only need to bear a small load. For this reason, it is more reasonable to prepare the first installation base S4 which is a yard installation base and the first installation base S4 which is a shipboard installation base separately, and to install the first installation base S4 which is a shipboard installation base on the ship B before the jacket-type structure 410 is moved. In addition, the first installation stand S4, which has a common configuration with the first installation stand S4 that is the yard installation stand and is different from the first installation stand S4 that is the yard installation stand, does not have to be used as the shipboard installation stand.

[0166] <Variation 4-4> The installation table system and movement method according to Modification 4-3 have been described using an example in which the first installation table S4, which is a yard installation table, and the first installation table S4, which is a shipboard installation table, have a common configuration but are prepared separately. In contrast, in the installation table system and movement method according to Modification 4-4, the first installation table S4, which is a yard installation table, and the second installation table (not shown), which is a shipboard installation table, have different configurations. It is preferable that the second installation table, which is a shipboard installation table, be made of steel as well.

[0167] For example, if the first installation stand S4, which is a yard installation stand, is not suitable for use as a shipboard installation stand, a second installation stand different from the first installation stand S4 is used as the shipboard installation stand. In this case, it is preferable to use a common framework for the first installation stand S4 and the second installation stand. In this way, by using a common framework for the first installation stand S4, which is a yard installation stand, and the second installation stand, which is a shipboard installation stand, it becomes possible to simplify the manufacture and handling of each. Furthermore, if the first installation stand S4 and the second installation stand share a common framework, shaped steel can also be used for the second installation stand, which is a shipboard installation stand, making it easier to manufacture both the first installation stand S4, which is a yard installation stand, and the second installation stand, which is a shipboard installation stand. Here, the framework of the installation stand refers to the arrangement (positional relationship) of the components included in the installation stand. Even if the frameworks of the two installation stands are the same, the sizes of the two installation stands may differ. In this case, the two installation stands are similar in shape.

[0168] In this case, the movement method includes an arrangement step of placing a second installation base, which is an on-board installation base, on the ship B, and an installation step of installing a jacket-type structure 410, which is an offshore structure, to be installed on the first installation base S4, which is a yard installation base, on the second installation base, which is an on-board installation base, placed in the arrangement step.

[0169] In the arranging step, the second installation stand, which is an on-board installation stand, is preferably placed on the ship B so as to span at least two or more of each of the plurality of beams and each of the plurality of walls, which are deck support members that support the deck B1 from below. That is, the second installation stand is preferably placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall.

[0170] In the installation step, for example, in the yard Y, the jacket-type structure 410 is removed from the first installation stand S4, which is a yard installation stand, and the jacket-type structure 410 is transported onto the ship B using a crane, a transport vehicle, a skid beam, or the like. Then, using a crane or the like, the legs 41 of the jacket-type structure 410 are installed directly or via temporary legs 43 on each of the second installation stands, which are shipboard installation stands, that were installed on the ship B in advance in the arrangement step. Also, for example, the jacket-type structure 410 together with the first installation stand S4, which is a yard installation stand, is moved from the yard Y onto the ship B using a crane, a transport vehicle, a skid beam, or the like, and on the ship B, the jacket-type structure 410 is removed from the first installation stand S4, which is a yard installation stand, and the jacket-type structure 410 is moved using a crane or the like, and the legs 41 are installed directly or via the temporary legs 43 on each of the second installation stands, which are shipboard installation stands that were installed on the ship B in advance in the arrangement step. The framework F of the first installation base S4, which is the installation base for the yard, and the framework of the second installation base, which is the installation base for the ship, do not have to be the same.

[0171] <Variation 4-5> In the installation table system and movement method according to Modification 4-4, the first installation table S4, which is a yard installation table, and the second installation table, which is a shipboard installation table, are configured differently but share a common framework, as an example. In contrast, in the installation table system and movement method according to Modification 4-5, the first installation table S4, which is a yard installation table, and the second installation table, which is a shipboard installation table, are configured differently from the framework.

[0172] For example, the first installation base S4, which is a yard installation base, is desirably small in size because it is sufficient to distribute the load of the jacket-type structure 410, which is an offshore structure, to the sturdy yard Y. In contrast, the second installation base, which is a shipboard installation base, is desirably sized to be able to straddle multiple deck support members of the ship B because the strength of the deck B1 of the ship B varies depending on the location. If the first installation base S4, which is a yard installation base, is smaller than this size, the framework of the second installation base, which is a shipboard installation base, is made larger than the framework of the first installation base S4, which is a yard installation base. In this way, by differentiating the frameworks of the first installation base S4, which is a yard installation base, and the second installation base, which is a shipboard installation base, it is possible to prepare appropriate ones for each. In this case, it is preferable that the second installation base, which is a shipboard installation base, is also made of steel. Moreover, it is preferable that shaped steel be used for the second installation base, which is a shipboard installation base. By using shaped steel, it becomes easy to manufacture the first installation stand S4, which is an installation stand for the yard, and the second installation stand, which is an installation stand for onboard the ship.

[0173] Furthermore, for example, the first installation platform S4, which is a yard installation platform, and the second installation platform, which is a shipboard installation platform, on which one leg 41 of the jacket-type structure 410 is installed, each bear a small load, and therefore can be made into a simple structure and manufactured at low cost. Therefore, even if the first installation platform S4, which is a yard installation platform, and the second installation platform, which is an shipboard installation platform, are prepared separately, an increase in cost can be suppressed, and the second installation platform, which is an shipboard installation platform, can be installed on the ship B before the jacket-type structure 410 is moved, allowing for efficient work.

[0174] The movement method in this case is also the same as the movement method in Modification Example 4-4. In this case, too, it is preferable that the second installation stand, which is an on-board installation stand, be placed on the ship B so as to span at least two or more of the multiple beams and the multiple walls, which are deck support members that support the deck B1 from below. In other words, it is preferable that the second installation stand S1 be placed on the ship B so as to span at least two beams, at least two walls, or at least one beam and at least one wall. The first installation stand S4, which is the installation stand for the yard, and the second installation stand, which is the installation stand for the ship, do not need to have different configurations in terms of their frameworks.

[0175] <Variation 4-6> In the fourth embodiment and variations 4-1 to 4-5, temporary legs 43 are provided to align the combined lengths of the legs 41 and the temporary legs 43 in the jacket-type structure 410. However, in the fourth embodiment and variations 4-1 to 4-5, the temporary legs 43 may not be provided, and first installation stands S4 having heights corresponding to the lengths of the legs 41 may be prepared to align the combined lengths of the legs 41 and the first installation stands S4. In this case, it is preferable to individually manufacture first installation stands S4 having heights corresponding to the lengths of the legs 41, and if there are multiple legs 41 of the same length, to manufacture multiple first installation stands S4 common to these legs. In variations 4-4 and 4-5, second installation stands having heights corresponding to the lengths of the legs 41 may also be prepared to align the combined lengths of the legs 41 and the second installation stands. In this case too, it is preferable to manufacture second installation stands individually with heights corresponding to the lengths of the respective legs 41, and if there are multiple legs 41 of the same length, to manufacture multiple second installation stands common to these.

[0176] It is also possible to have a first system that includes the installation stand system 100 according to the first embodiment and any one of variations 1-1 to 1-5, or the installation stand system 200 according to the second embodiment and any one of variations 2-1 to 2-5, or the installation stand system 300 according to the third embodiment and any one of variations 3-1 to 3-5, and the installation stand system 400 according to the fourth embodiment and any one of variations 4-1 to 4-5.

[0177] This first system is a system including a first installation base system on which a bottom-mounted foundation including an offshore wind turbine jacket structure 10 that supports the offshore wind turbine or an offshore wind turbine monopile foundation 210 that supports the offshore wind turbine is installed, and a second installation base system on which a jacket structure 410 is installed.

[0178] This first system includes a first installation base system, a first yard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed in yard Y, and a first shipboard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed on ship B. Alternatively, this first system includes a first installation base system, which includes a first yard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed in yard Y, and a first shipboard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed on ship B.

[0179] This first system includes a second installation base system, a second yard installation base on which leg 41 of the jacket-type structure 410 is installed and which is placed in yard Y, and a second shipboard installation base on which leg 41 of the jacket-type structure 410 is installed and which is placed on ship B.

[0180] In this first system, the first yard installation stand is made of steel. In this first system, the second yard installation stand is made of steel and uses shaped steel.

[0181] It is also possible to provide a second system that includes the installation stand system 100 according to the first embodiment and any one of variants 1-1 and 1-2, or the installation stand system 200 according to the second embodiment and any one of variants 2-1 and 2-2, or the installation stand system 300 according to the third embodiment and any one of variants 3-1 and 3-2, and any one of variants 3-4, 3-5, 4-4 and 4-5.

[0182] This second system is a system including a first installation base system on which a bottom-mounted foundation including an offshore wind turbine jacket structure 10 that supports the offshore wind turbine or an offshore wind turbine monopile foundation 210 that supports the offshore wind turbine is installed, and a second installation base system on which a jacket structure 410 is installed. This second system includes a first installation base system, a first yard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed in yard Y, and a first shipboard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed on ship B. Alternatively, this second system includes a first installation base system, which includes a first yard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed in yard Y, and a first shipboard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed on ship B.

[0183] This second system includes a second installation platform system, a second yard installation platform on which leg 41 of the jacket-type structure 410 is installed and which is placed in yard Y, and a second shipboard installation platform on which leg 41 of the jacket-type structure 410 is installed and which is placed on ship B.

[0184] In this second system, the first yard installation base is made of steel, and the first yard installation base and the first shipboard installation base are the same. In this second system, the second yard installation platform and the second shipboard installation platform are different.

[0185] It is also possible to provide a third system that includes the installation stand system 100 according to the first embodiment and any one of variants 1-1 and 1-2, or the installation stand system 200 according to the second embodiment and any one of variants 2-1 and 2-2, or the installation stand system 300 according to the third embodiment and any one of variants 3-1 and 3-2, and the installation stand system 400 according to the fourth embodiment and any one of variants 4-1 and 4-2.

[0186] This third system is a system including a first installation base system on which a fixed-bottom foundation including an offshore wind turbine jacket structure 10 that supports the offshore wind turbine or an offshore wind turbine monopile foundation 210 that supports the offshore wind turbine is installed, and a second installation base system on which a jacket structure 410 is installed. This third system includes a first installation base system, a first yard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed in yard Y, and a first shipboard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed on ship B. Alternatively, this third system includes a first installation base system, which includes a first yard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed in yard Y, and a first shipboard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed on ship B.

[0187] This third system includes a second installation base system, a second yard installation base on which leg 41 of the jacket-type structure 410 is installed and which is placed in yard Y, and a second shipboard installation base on which leg 41 of the jacket-type structure 410 is installed and which is placed on ship B.

[0188] In this third system, the first yard installation base is made of steel, and the first yard installation base and the first shipboard installation base are the same. In this third system, the second yard installation platform and the second shipboard installation platform are the same.

[0189] It is also possible to create a fourth system that includes the installation stand system 100 according to the first embodiment and any one of variations 1-1 to 1-5, or the installation stand system 200 according to the second embodiment and any one of variations 2-1 to 2-5, or the installation stand system 300 according to the third embodiment and any one of variations 3-1 to 3-5, and variation 4-6 of the installation stand system according to the fourth embodiment.

[0190] This fourth system is a system including a first installation base system on which a fixed-bottom foundation including an offshore wind turbine jacket structure 10 that supports the offshore wind turbine or an offshore wind turbine monopile foundation 210 that supports the offshore wind turbine is installed, and a second installation base system on which a jacket structure 410 is installed. This third system includes a first installation base system, a first yard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed in yard Y, and a first shipboard installation base on which the jacket structure 10 for an offshore wind turbine, which is a bottom-fixed foundation, is installed and placed on ship B. Alternatively, this fourth system includes a first installation base system, which includes a first yard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed in yard Y, and a first shipboard installation base on which a monopile foundation 210 for an offshore wind turbine, which is a fixed-bottom foundation, is installed and placed on ship B.

[0191] In this fourth system, the second installation base system includes a second yard installation base on which leg 41 of the jacket-type structure 410 is installed and which is placed in yard Y, and a second shipboard installation base on which leg 41 of the jacket-type structure 410 is installed and which is placed on ship B. This fourth system has a steel installation base for the first yard. In this fourth system, the second yard installation platform and the second shipboard installation platform include one that is common to a plurality of legs 41 and one that is individual to each leg 41.

[0192] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0193] In addition, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of the present disclosure.

[0194] (Addendum) The installation stand system according to the embodiment can be understood, for example, as follows.

[0195] (1) An installation stand system according to one aspect of the present disclosure includes: An installation stand system on which an offshore structure is installed, a yard installation base on which the marine structure is installed and which is placed in a yard; a shipboard installation base on which the marine structure is installed and which is placed on a ship; Including, The yard installation base is made of steel, The offshore structure includes a bottom-mounted foundation or a jacket-type structure that supports an offshore wind turbine. It is characterized by:

[0196] This installation base system includes a yard installation base on which the offshore structure is installed and placed in a yard, and a shipboard installation base on which the offshore structure is installed and placed on a ship, so that the installation base system can install the offshore structure both in the yard and on the ship. In addition, in this installation base system, the yard installation base on which the marine structure is installed and which is placed in the yard is made of steel, so that the weight of the yard installation base in this installation base system is lighter by making this yard installation base out of steel than when this yard installation base is made out of concrete.

[0197] (2) In the installation stand system according to (1) above, The framework of the yard installation base and the framework of the shipboard installation base may have a common structure.

[0198] With this configuration, it is possible to facilitate the fabrication and handling of the yard installation stand and the shipboard installation stand.

[0199] (3) In the installation stand system according to (2) above, The yard installation stand and the shipboard installation stand may be the same.

[0200] With this configuration, by using the same installation base for the yard and the on-board installation base, it becomes possible to use the same installation base both in the yard and on the board.

[0201] (4) In the installation stand system according to (2) above, The framework of the yard installation base and the framework of the shipboard installation base may have different configurations.

[0202] With this configuration, it is possible to prepare an appropriate installation stand for each of the yard and the ship.

[0203] (5) In the installation stand system according to any one of (1) to (4) above, The yard installation base and the shipboard installation base may be configured to use shaped steel.

[0204] This configuration makes it easier to manufacture the yard installation base and the shipboard installation base.

[0205] (6) In the installation stand system according to any one of (1) to (5) above, the marine structure is a jacket-type foundation supporting an offshore wind turbine, The shipboard installation stand may be configured to be placed on the ship so as to span a plurality of deck support members of the ship.

[0206] With this configuration, even if the item to be installed on the shipboard installation stand is a heavy item such as a jacket-type foundation, it can be placed securely on the ship.

[0207] (7) In the installation stand system according to any one of (1) to (5) above, the marine structure is a monopile foundation supporting an offshore wind turbine, the monopile foundation being in a laid-down state; Each of the yard installation base and the shipboard installation base may include a substantially U-shaped portion.

[0208] This configuration allows the monopile foundation to be placed more reliably in a yard or on a ship in a laid-down position.

[0209] (8) In the installation base system according to (7) above, the yard installation base may be configured such that a steel prevention member for preventing the monopile foundation from rolling is attached by welding.

[0210] With this configuration, since the yard installation base is made of steel, a steel prevention member for preventing the monopile foundation from rolling can be easily provided on the yard installation base.

[0211] (9) In the installation stand system according to any one of (1) to (5) above, the marine structure is a monopile foundation supporting an offshore wind turbine, the monopile foundation being in an erected state; Each of the yard installation platform and the shipboard installation platform may include a beam.

[0212] With this configuration, the monopile foundation in the erected state can be reliably supported by both the yard installation base and the shipboard installation base.

[0213] (10) A movement method according to one aspect of the present disclosure includes: A method for moving the marine structure using the installation platform system according to any one of (1), (2), and (4), an arrangement step of arranging the ship-mounted installation stand on the ship; an installation step of installing the marine structure to be installed on the yard installation stand on the shipboard installation stand that is installed in the installation step; The present invention is characterized by comprising:

[0214] This moving method makes it possible to install an offshore structure installed on a yard installation stand placed in a yard onto a shipboard installation stand that is placed on a ship.

[0215] (11) A movement method according to one aspect of the present disclosure includes: A method for moving the marine structure using the installation stand system described in (3) above, and a moving step of moving the marine structure together with the yard installation stand onto the ship.

[0216] In this method of transportation, since the yard installation platform and the shipboard installation platform are the same, it is not necessary to transfer the offshore structure from the yard installation platform to the shipboard installation platform when moving the offshore structure from the yard to the ship. Furthermore, since the yard installation platform is made of steel, it is relatively light and can be moved together with the offshore structure.

[0217] (12) In the movement method according to (11) above, The moving step includes: a jack-up step for jacking up the marine structure together with the yard installation base; a placing step of placing the marine structure to be jacked up by the jack-up step and the yard installation base on a skid beam; The configuration may include the above.

[0218] With this configuration, the offshore structure and the yard installation platform can be moved more reliably using the skid beam.

[0219] (13) A system according to one embodiment of the present disclosure includes: A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is A first yard installation base on which the bottom-mounted foundation is installed and placed in the yard; A first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is A second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; A second shipboard installation stand on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The second yard installation base is made of steel and uses shaped steel. It is characterized by:

[0220] In this system, the foundation of the jacket-type structure is installed, and the second yard installation base placed in the yard is made of steel. Therefore, in this installation base system, the weight of the yard installation base is lighter by making it out of steel than if it were made out of concrete. In addition, because the second yard installation base is made of shaped steel, it is easy to manufacture.

[0221] (14) A system according to one embodiment of the present disclosure includes: A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is A first yard installation base on which the bottom-mounted foundation is installed and placed in the yard; A first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is A second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; A second shipboard installation stand on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The first yard installation stand and the first shipboard installation stand are the same, The second yard installation stand and the second shipboard installation stand are different. It is characterized by:

[0222] In this system, a fixed foundation is installed, and the first yard installation platform placed in the yard is made of steel. Therefore, in this installation platform system, the weight of the first yard installation platform is lighter by making the first yard installation platform out of steel than if it were made out of concrete. Furthermore, because the first yard installation platform and the first shipboard installation platform are the same, it is possible to use the same installation platform in both the yard and the shipboard. The second yard installation platform on which the foundation of the jacket-type structure is installed is different from the second shipboard installation platform on which the foundation of the jacket-type structure is installed. The second yard installation platform and the second shipboard installation platform on which the foundation of the jacket-type structure is installed only need to bear a small load, so they can be made simple in structure and manufactured at low cost. Therefore, even if the second yard installation platform and the second shipboard installation platform are prepared separately, cost increases can be suppressed, and the second shipboard installation platform can be installed on the ship before the jacket-type structure is moved, allowing for efficient work.

[0223] (15) A system according to one embodiment of the present disclosure includes: A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is A first yard installation base on which the bottom-mounted foundation is installed and placed in the yard; A first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is A second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; A second shipboard installation stand on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The first yard installation stand and the first shipboard installation stand are the same, The second yard installation stand and the second shipboard installation stand are the same. It is characterized by:

[0224] In this system, the fixed-bottom foundation is installed, and the first yard installation platform placed in the yard is made of steel. Therefore, in this installation platform system, the weight of the first yard installation platform is lighter by making the first yard installation platform out of steel than if the first yard installation platform were made out of concrete. Furthermore, because the first yard installation platform on which the fixed-bottom foundation is installed and the first shipboard installation platform are the same, it is possible to use the same installation platform in both the yard and on the ship. Furthermore, because the second yard installation platform and the second shipboard installation platform on which the foundation of the jacket-type structure is installed are the same, it is possible to use the same installation platform in both the yard and on the ship.

[0225] (16) A system according to one embodiment of the present disclosure includes: A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is A first yard installation base on which the bottom-mounted foundation is installed and placed in the yard; A first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is A second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; A second shipboard installation stand on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The second yard installation base and the second shipboard installation base include one common to the plurality of bases and one individual to the base, It is characterized by:

[0226] In this system, a fixed-bottom foundation is installed, and the first yard installation platform placed in the yard is made of steel. Therefore, in this installation platform system, the weight of the first yard installation platform is lighter by making the first yard installation platform out of steel than if it were made out of concrete. The second yard installation platform and the second shipboard installation platform on which the foundations of the jacket-type structure are installed include one common to multiple foundations and one individual to each foundation, so the jacket-type structure can be installed well according to the length of the foundation. [Explanation of symbols]

[0227] 10 Jacket structure for offshore wind turbines (offshore structure, jacket foundation) 100, 200, 300, 400 installation system 210 Monopile foundation for offshore wind turbines (offshore structures) 410 Jacketed Structure B ship B2 Transbeam (deck support member) B3 Longitudinal material F. Frame S1~S4 1st installation stand S2a Leg (frame) S2b U-shaped part S2b2 Steel prevention members S3a1 Beam Y yard

Claims

1. An installation stand system on which an offshore structure is installed, a yard installation base on which the marine structure is installed and which is placed in a yard; a shipboard installation base on which the marine structure is installed and which is placed on a ship; Including, The yard installation base is made of steel, the offshore structure includes a bottom-mounted foundation or a jacket-type structure that supports the offshore wind turbine; The framework of the yard installation base and the framework of the shipboard installation base are different. An installation stand system characterized by:

2. An installation stand system on which an offshore structure is installed, a yard installation base on which the marine structure is installed and which is placed in a yard; a shipboard installation base on which the marine structure is installed and which is placed on a ship; Including, The yard installation base is made of steel, the marine structure is a jacket-type foundation supporting an offshore wind turbine, The shipboard installation stand is placed on the ship so as to span a plurality of deck support members. An installation stand system characterized by:

3. An installation stand system on which an offshore structure is installed, a yard installation base on which the marine structure is installed and which is placed in a yard; a shipboard installation base on which the marine structure is installed and which is placed on a ship; Including, The yard installation base is made of steel, the marine structure is a monopile foundation supporting an offshore wind turbine, the monopile foundation being in a laid-down state; each of the yard installation base and the shipboard installation base includes a substantially U-shaped portion; The yard installation base is provided with a steel prevention member welded to prevent the monopile foundation from rolling. An installation stand system characterized by:

4. The framework of the yard installation base and the framework of the shipboard installation base are common to each other.

4. The installation stand system according to claim 2 or 3.

5. The yard installation stand and the shipboard installation stand are the same.

5. The installation stand system according to claim 4.

6. The yard installation base and the shipboard installation base are made of structural steel.

4. The installation stand system according to claim 1, wherein the installation stand system is a stand for mounting a plurality of objects.

7. the marine structure is a monopile foundation supporting an offshore wind turbine, the monopile foundation being in an erected state; Each of the yard installation base and the shipboard installation base includes a beam.

2. The installation stand system according to claim 1.

8. A method for moving the marine structure using the installation platform system according to any one of claims 1 to 3, comprising: an arrangement step of arranging the ship-mounted installation stand on the ship; an installation step of installing the marine structure to be installed on the yard installation stand on the shipboard installation stand that is installed in the installation step; A movement method comprising:

9. A method for moving the marine structure using the installation stand system according to claim 4, comprising: an arrangement step of arranging the ship-mounted installation stand on the ship; an installation step of installing the marine structure to be installed on the yard installation stand on the shipboard installation stand that is installed in the installation step; A movement method comprising:

10. A method for moving the marine structure using the installation stand system according to claim 5, comprising: a moving step of moving the marine structure together with the yard installation stand onto the ship; A method of moving, comprising:

11. The moving step includes: a jack-up step for jacking up the marine structure together with the yard installation base; a placing step of placing the marine structure to be jacked up by the jack-up step and the yard installation base on a skid beam; The method of claim 10, further comprising:

12. A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is a first yard installation base on which the bottom-mounted foundation is installed and which is placed in the yard; a first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is a second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; a second shipboard installation platform on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The second yard installation base is made of steel, and shaped steel is used. A system characterized by:

13. A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is a first yard installation base on which the bottom-mounted foundation is installed and which is placed in the yard; a first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is a second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; a second shipboard installation platform on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The first yard installation stand and the first shipboard installation stand are the same, The second yard installation stand and the second shipboard installation stand are different. A system characterized by:

14. A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is a first yard installation base on which the bottom-mounted foundation is installed and which is placed in the yard; a first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is a second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; a second shipboard installation platform on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The first yard installation stand and the first shipboard installation stand are the same, The second yard installation stand and the second shipboard installation stand are the same. A system characterized by:

15. A system including a first installation stand system on which a bottom-mounted foundation supporting an offshore wind turbine is installed, and a second installation stand system on which a jacket-type structure is installed, The first installation stand system is a first yard installation base on which the bottom-mounted foundation is installed and which is placed in the yard; a first shipboard installation base on which the bottom-mounted foundation is installed and which is placed on a ship; Including, The second installation stand system is a second yard installation stand on which the foundation of the jacket-type structure is installed and which is placed in the yard; a second shipboard installation platform on which the foundation of the jacket-type structure is installed and which is placed on the ship; Including, The first yard installation stand is made of steel, The second yard installation base and the second shipboard installation base include one common to the plurality of bases and one individual to the base, A system characterized by:

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