Floater for floating offshore wind power generator and assembly method therefor

Abstract

Disclosed is a floater for a floating offshore wind power generator, comprising: columns; and connection structures connecting the columns. According to a first embodiment, each of the columns may be provided with a sliding groove having an open upper end and extending in a vertical direction. Each of the connection structures may be slidably coupled to the sliding groove through the open upper end. According to a second embodiment, the columns may comprise: a central column having a wind power generator coupled to the top surface thereof; and a plurality of outer columns spaced apart from each other at regular angular intervals around the central column and providing buoyancy. The connection structures may comprise: an internal connection structure installed between the central column and the outer columns to establish an internal connection arrangement; and an external connection structure installed between the plurality of outer columns to establish an external connection arrangement.

Description

Floater for floating offshore wind turbine and assembly method thereof

[0001] A first embodiment of the present invention relates to a floater for a floating offshore wind turbine that is easy to assemble.

[0002] A second embodiment of the present invention relates to a floater for a floating marine wind power generator, which is designed to be lightweight and mass-producible through assembly, and a method for assembling the same.

[0003] A floating offshore wind turbine may include a floater that floats on the sea and a wind turbine.

[0004] Among them, plotters are being developed in various models, and development is progressing toward maximizing assembly convenience to ensure economic feasibility.

[0005] Fig. 1 is a perspective view showing an example of a conventional floating offshore wind turbine, and Fig. 2 is an exploded perspective view of Fig. 1.

[0006] Referring to FIGS. 1 and 2, a floater (1) for a floating marine wind power generator, which includes a center column (1a) to which a wind power generation device (2) is coupled, outer columns (1b) that generate buoyancy, main braces (1c) that connect the outer columns (1b) to the center column (1a), and sub-braces (1d) that connect the outer columns (1b) to each other, is typically manufactured by receiving the above-described components from a manufacturer and assembling them in a yard. However, in the case of the conventional floater (1), when connecting the columns (1a, 1b) and the braces (1c, 1d), the braces (1c, 1d) must be lifted by a crane, a worker's foot must be installed, and the assembly must be adjusted to a certain degree, thereby making the assembly work difficult.

[0007] Additionally, there was a risk of safety accidents due to working at heights, and there was also the problem of requiring a lot of manpower and time for the installation and removal of the scaffolding.

[0008] In addition, when connecting braces (1c, 1d) to columns (1a, 1b) by welding, there was also a problem that it was difficult to apply automated equipment due to the three-dimensional shape of the welding area.

[0009] Meanwhile, demand for renewable energy sources such as solar, wind, and tidal power is increasing due to the 2050 net-zero goal and environmental concerns. In particular, both the government and local communities are working to attract the wind power industry, which boasts relatively high energy efficiency.

[0010] Wind turbines have traditionally been installed primarily in mountainous areas due to factors such as noise generated by their large rotor blades. However, these installations also cause damage to the environment and pose a risk to surrounding flora and fauna during operation. Therefore, a shift towards offshore installations is underway. Currently, fixed-type wind turbines (e.g., offshore jacket wind turbines) are widely used worldwide for energy production in relatively shallow waters.

[0011] However, even when installed offshore, they are still not free from issues such as noise, damage to the natural landscape, and opposition from fishermen. Accordingly, a consortium of developers, comprised of several oil majors and energy solution companies, is pursuing a project to develop floating offshore wind farms (Energy Fields), including floating wind turbines and offshore substations.

[0012] Fig. 15 is a drawing showing the structure of a floater for a conventional floating marine wind power generator, and Fig. 16 is a drawing showing a plate and reinforcement type structure applied to the floater for a floating marine wind power generator of Fig. 15.

[0013] Most recent floater designs have a triangular shape to reduce weight. The floater (10) illustrated in Fig. 15 is composed of cylindrical columns (11, 12), a deck box (13), and a pontoon (14).

[0014] However, in the case of a design consisting of a plate and stiffened type structure as shown in Fig. 16 up to the pontoon (14) and deck box (13), not only must the plate welding be performed on the outside during the final assembly, but also the stiffener (Longi. Member) (20) must be butt-welded, so a worker must directly enter the closed space to perform the welding work. After that, it takes about 6 to 8 weeks to complete the work from the final assembly to load-out, including welding inspection / tank air test / painting for this welding line.

[0015] Mega projects manufacturing more than 50 units may have a target of one unit per week for offshore installation. However, since the Floater Hull Final Assembly Area (FFA) requires space to simultaneously work on six to eight units (approximately 86m x 76m per unit), there is also a constraint that when selecting a manufacturing yard for the project, a subcontractor with a large manufacturing yard must be contracted. This can account for a significant portion of the project execution cost of an offshore floating wind turbine.

[0016] Additionally, in structures typically involving welding plates and stiffeners (see Figure 16), tolerances are established and manufacturing is managed. However, tolerance management is difficult due to shrinkage, distortion, and sagging caused by welding heat, transport, and lifting.

[0017] A widely used and efficient block-interlocking method in a plotter structure such as that illustrated in Fig. 15 is a method of first installing the central column (11) and the outer column (12) and then interlocking the pontoon (14) and the deck box (13), which allows for the omission of the deck box PE support and shortening of the construction period.

[0018] However, if the dimensions are not accurately measured during the manufacturing process, numerous problems can arise during crane lifting and final installation. These issues can include delays in adjusting or repairing, safety concerns when working in the air using a crane, such as for upper deck boxes, and equipment costs associated with long-term crane use. From a dimension control perspective, it's necessary to proactively incorporate separate countermeasures for anticipated issues (such as dimension inconsistencies) into the design phase.

[0019] Finally, scaffolding installation is essential for final assembly operations (block setting / welding / inspection / painting, etc.) and other high-altitude work. Furthermore, routes or access devices (e.g., cherry pickers) must be provided to ensure safe access for workers and equipment to the work location. Depending on the design, access for workers during high-altitude work can be extremely difficult and dangerous. Furthermore, installing and removing scaffolding can be extremely time-consuming.

[0020] If all these situations are not reflected in the design in advance, the production will inevitably become very difficult.

[0021] The matters described in the technical background of this invention are for understanding the background of the invention, and cannot be determined to be prior art already known to a person with ordinary skill in the field to which this technology belongs.

[0022] A first embodiment of the present invention provides a floater for a floating offshore wind turbine that is easy to assemble.

[0023] The second embodiment of the present invention is to provide a floating offshore wind power generator floater and an assembly method thereof, which are designed to be lightweight and mass-producible, so as to improve cost through a design that maximizes light weight, easy installation method, safety, and productivity.

[0024] The second embodiment of the present invention provides a floating marine wind power generator floater and an assembly method thereof, which are designed to be lightweight and mass-producible and are specialized for assembly, thereby securing competitiveness by improving work site costs through shortening the final assembly work period by a simple installation method.

[0025] Other problems to be solved by the present invention can be easily understood through the following explanation.

[0026] A floater for a floating offshore wind turbine according to a first embodiment of the present invention may include columns and braces.

[0027] Each of the above braces can connect the above columns.

[0028] Each of the above columns may be provided with a sliding groove that is open at the top and extends in the vertical direction.

[0029] Each of the above braces may be slidably engaged into the sliding groove through the open top.

[0030] According to one embodiment of the present invention, the sliding groove may be provided in a sunken form on the outer surface of the column.

[0031] According to one embodiment of the present invention, each of the columns has at least two protrusions protruding from the outer surface, and the sliding groove can be provided on the outer surface by the protrusions.

[0032] According to one embodiment of the present invention, the lower end of the sliding groove can be closed by a stopper surface.

[0033] According to one embodiment of the present invention, the sliding groove may have a first region and a second region defined.

[0034] In the first region, the width of the sliding groove may be constant.

[0035] The second region is a region from the upper end of the first region to the upper end of the sliding groove, and in the second region, the width of the sliding groove may increase as the height increases.

[0036] According to one embodiment of the present invention, the plotter may further include a finishing material.

[0037] The above finishing material can be combined with the upper portion of the above sliding groove.

[0038] According to one embodiment of the present invention, each of the braces may include a first vertical bar, a second vertical bar, and connecting bars.

[0039] The first vertical bar can be inserted into the sliding groove of one of the columns and extend in the vertical direction.

[0040] The second vertical bar can be inserted into the sliding groove of another column among the columns and extend in the vertical direction.

[0041] The above connecting bars can connect the first vertical bar and the second vertical bar.

[0042] According to one embodiment of the present invention, the cross-sectional shape of each of the first vertical bar and the second vertical bar may be a polygon.

[0043] According to one embodiment of the present invention, each of the first vertical bar and the second vertical bar can be fixed to the column through a straight weld extending in the vertical direction.

[0044] A floater for a floating marine wind power generator according to a second embodiment of the present invention may include a central column, a plurality of outer columns, an internal connection structure, and an external connection structure. The central column may have a wind power generation device coupled to an upper surface thereof. The plurality of outer columns are spaced apart from the central column at a predetermined angular interval and may provide buoyancy. The internal connection structure may be installed between the central column and the outer columns to establish an internal connection structure. The external connection structure may be installed between the plurality of outer columns to establish an external connection structure.

[0045] According to one embodiment of the present invention, at least one of the internal connection structure and the external connection structure may have a brace frame structure.

[0046] According to one embodiment of the present invention, the internal connection structure may include an inner upper horizontal support, an inner lower horizontal support, an inner diagonal support, a first inner vertical support, and a second inner vertical support. The inner upper horizontal support may be connected between an upper end of the first inner vertical support and an upper end of the second inner vertical support, the inner lower horizontal support may be connected between a lower end of the first inner vertical support and a lower end of the second inner vertical support, and the inner diagonal support may be connected between a lower end of the first inner vertical support and an upper end of the second inner vertical support.

[0047] According to one embodiment of the present invention, the internal connection structure may further include: a lower outer fastening portion provided at a lower end of the first inner vertical support portion and for coupling to a lower portion of the outer column to which one end of the inner lower horizontal support portion and one end of the inner diagonal support portion are coupled; an upper central fastening portion provided at an upper end of the second inner vertical support portion and for coupling to an upper portion of the central column to which one end of the inner upper horizontal support portion and the other end of the inner diagonal support portion are coupled; a lower central fastening portion provided at a lower end of the second inner vertical support portion and for coupling to a lower portion of the central column to which the other end of the inner lower horizontal support portion is coupled; and an upper outer fastening portion provided at the other end of the inner upper horizontal support portion and for coupling to an upper portion of the outer column.

[0048] According to one embodiment of the present invention, the external connecting structure may include an outer upper horizontal support, an outer lower horizontal support, first to second outer diagonal supports, and first to third outer vertical supports. An upper end of the first outer vertical support and an upper end of the first outer diagonal support may be connected to one end of the outer upper horizontal support, and an upper end of the third outer vertical support and an upper end of the second outer diagonal support may be connected to the other end of the outer upper horizontal support. A lower end of the first outer vertical support may be connected to one end of the outer lower horizontal support, and a lower end of the third outer vertical support may be connected to the other end. The second outer vertical support may be connected between any point between one end and the other end of the outer upper horizontal support and any point between one end and the other end of the outer lower horizontal support, and the lower end of the first outer diagonal support and the lower end of the second outer diagonal support may be connected to any point between one end and the other end of the outer lower horizontal support.

[0049] According to one embodiment of the present invention, the outer column may be manufactured lower than the upper deck and may further include a sunken deck for joining the inner connecting structure and the outer connecting structure.

[0050] According to one embodiment of the present invention, the sunken deck may be divided into three joining spaces including a central joining space where the upper outer fastening portion of the inner joining structure is joined and left and right outer joining spaces where the outer upper horizontal support portion of the outer joining structure is joined.

[0051] According to one embodiment of the present invention, the central coupling space may be provided with a first outer upper horizontal bracket having a multi-layer structure that restricts left-right movement of the upper outer fastening portion. A guide groove corresponding to a portion of the cross-section of the upper outer fastening portion may be formed in the first outer upper horizontal bracket.

[0052] According to one embodiment of the present invention, the outer joint space may be provided with a pair of second outer upper horizontal brackets that limit the left-right movement of the outer upper horizontal support. An upper stopper, on which one end of the outer upper horizontal support is secured, may be installed on the bottom surface of the pair of second outer upper horizontal brackets.

[0053] According to one embodiment of the present invention, the outer column may further include a connecting structure mounting portion provided at the lower portion and including a stopper and a bracket for mounting the inner connecting structure and the outer connecting structure.

[0054] According to one embodiment of the present invention, the connecting structure mounting portion may include a central mounting space in which a lower outer fastening portion of the inner connecting structure is mounted, and an outer mounting space disposed on the left and right of the central mounting space in which an outer lower horizontal support portion of the outer connecting structure is mounted.

[0055] According to one embodiment of the present invention, a central stopper for limiting the descent of the lower outer fastening part and a central bracket for limiting the left-right movement of the lower outer fastening part may be installed in the central mounting space.

[0056] According to one embodiment of the present invention, an outer bracket that restricts left-right movement of the outer lower horizontal support and an outer vertical bracket / stopper that restricts descent of the outer lower horizontal support may be installed in the outer mounting space.

[0057] According to one embodiment of the present invention, the outer bracket may include a pair of sub-brackets each directly coupled to the outer column. The pair of sub-brackets may be spaced apart from each other along the circumference of the outer column. The outer vertical bracket and stopper may be directly coupled to the outer column. In the outer mounting space, a pair of lower connecting brackets connecting each of the pair of sub-brackets to the outer vertical bracket and stopper, and a pair of upper connecting brackets connecting each of the pair of sub-brackets to the outer column may be additionally installed. The sub-bracket may have a plate shape perpendicular to the longitudinal direction of the outer column. The outer vertical bracket and stopper may have a plate shape extending in the longitudinal direction of the outer column. The lower connecting bracket may extend from the lower surface of the sub-bracket to the side surface of the outer vertical bracket and stopper. The above upper connecting bracket can extend from the upper surface of the above sub-bracket to the outer circumference of the above outer column.

[0058] According to one embodiment of the present invention, the central column may be provided with a multi-layered upper guide bracket having a first guide groove formed corresponding to the upper central fastening portion of the internal connection structure, and a multi-layered lower guide bracket having a second guide groove formed corresponding to the lower central fastening portion of the internal connection structure, on the lower portion thereof.

[0059] According to one embodiment of the present invention, a void tank compartment functioning as a double bulkhead can be formed for a collision zone in which the average water level is considered inside the outer column.

[0060] A method for assembling a floater for a floating offshore wind turbine according to a second embodiment of the present invention may include the steps of: arranging a central column and a plurality of outer columns in a work site; using a crane to lift up an internal connection structure and move it laterally to align it between the central column and the outer columns; using the crane to lower the internal connection structure so that it becomes self-supporting to establish an internal connection structure between the central column and the outer columns; using the crane to lift up an external connection structure so that it becomes self-supporting to align it between the plurality of outer columns; and using the crane to lower the external connection structure so that it becomes self-supporting to establish an external connection structure between the plurality of outer columns.

[0061] According to one embodiment of the present invention, a non-slip support is installed on the lower surface of the central column, and a slip support is installed on the lower surface of the outer column, so that the position of the outer column can be adjusted after the installation of the internal connecting structure during the final assembly process.

[0062] According to one embodiment of the present invention, the self-supporting step can be assembled in an insert-into manner in which the inner connecting structure and the outer connecting structure are fitted into brackets provided in the central column and the outer column.

[0063] According to one embodiment of the present invention, a detachable foot platform may be installed on the upper part of the central column as a device for worker access, thereby enabling high-altitude work to be performed.

[0064] According to the first embodiment of the present invention, the degree of assembly of the brace can be adjusted in a short period of time by lifting the brace by a crane and slidingly engaging it through the open top of the sliding groove.

[0065] In addition, since straight line welding is possible, it may be easier to apply to automated welding equipment, etc.

[0066] According to the second embodiment of the present invention, cost can be improved through a design that maximizes light weight, simple installation method, safety, and productivity.

[0067] Additionally, it has the effect of securing competitiveness by improving workshop costs through shortening the final assembly work period through simple installation methods.

[0068] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0069] Figure 1 is a perspective view showing an example of a conventional floating offshore wind turbine.

[0070] Figure 2 is an exploded perspective view of Figure 1,

[0071] Figure 3 is a plan view of a floater for a floating marine wind power generator according to the first embodiment of the present invention.

[0072] Figure 4 is an exploded view of Figure 3,

[0073] Figure 5 is a front view of the center column of Figure 4,

[0074] Fig. 6 is a modified example of the sliding groove of Fig. 4,

[0075] Fig. 7 is a modified example of the sliding groove of Fig. 5,

[0076] Fig. 8 is another modified example of the sliding groove of Fig. 5,

[0077] Figure 9 is a front view of the main brace of Figure 4,

[0078] Fig. 10 is a front view of the sub-brace of Fig. 4,

[0079] Figures 11 to 13 are drawings for explaining the assembly process of a floater for a floating marine wind power generator according to the first embodiment of the present invention.

[0080] Fig. 14 is a cross-sectional view taken along line I-I of Fig. 13,

[0081] Figure 15 is a drawing showing the structure of a floater for a typical floating offshore wind turbine.

[0082] Figure 16 is a drawing showing a plate and reinforcement type structure applied to the floater for the floating offshore wind turbine of Figure 15.

[0083] Figure 17 is a perspective view showing the assembled state of a floater for a floating marine wind power generator according to the second embodiment of the present invention.

[0084] FIG. 18 is a drawing showing a wind power generation device coupled to a floater for a floating marine wind power generator according to a second embodiment of the present invention.

[0085] Figure 19 is a plan view of a floater for a floating marine wind power generator according to a second embodiment of the present invention.

[0086] Figure 20 is a bottom view of a floater for a floating marine wind turbine according to a second embodiment of the present invention.

[0087] Fig. 21 is a cross-sectional view taken along line “A” of Fig. 19,

[0088] Fig. 22 is a cross-sectional view taken along line "B" of Fig. 19,

[0089] Figure 23 is a drawing showing the upper and lower connecting parts of the outer column,

[0090] Figure 24 is a drawing showing the upper and lower connecting parts of the central column.

[0091] Figure 25 is a drawing showing the lifting and adjustment of the internal connection structure.

[0092] Figure 26 is a drawing showing the lifting and adjustment of the external connection structure.

[0093] Figure 27 is a drawing showing the installation process of the connecting structure.

[0094] Figures 28 and 29 are drawings for explaining the chief platform mounted on the central column.

[0095] Figures 30 to 32 are drawings for explaining examples of deformation of the lower connecting portion of the outer column.

[0096] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0097] The attached drawings are not drawn to scale to help understand the invention and the dimensions of some components may be exaggerated.

[0098] The terms used in the specification and claims of the present invention should not be limited to their usual or dictionary meanings, and should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0099] In this specification, singular forms will be considered to include plural forms as well, unless otherwise specified.

[0100] Additionally, when a part is described as "including" a certain component, it means that the part may also include other components.

[0101] Additionally, when a component is described as "upper", it means above or below that component, and does not necessarily mean that it is located on the upper side with respect to the direction of gravity.

[0102] Additionally, when a component is described as being "connected" or "coupled" to another component, this may include not only cases where the component is directly connected or coupled to the other component, but also cases where the component is indirectly connected or coupled through another component.

[0103] Additionally, terms such as first, second, etc. may be used to describe certain components, but these terms are only intended to distinguish the components from other components and are not intended to limit the nature, order, or sequence of the components.

[0104] In a first embodiment of the present invention, first to third directions (DR1 to DR3) may be defined. The first direction (DR1) may be a radial direction of the column (3100). The second direction (DR2) may be a radial direction of the column (3100) and may be a direction intersecting the first direction (DR1). The third direction (DR3) may be a direction intersecting the first direction (DR1) and the second direction (DR2) and may be a longitudinal direction of the column (3100). In addition, the third direction (DR3) may be an up-down direction.

[0105] FIG. 3 is a plan view of a floater for a floating marine wind power generator according to a first embodiment of the present invention, and FIG. 4 is an exploded view of FIG. 3.

[0106] Referring to FIGS. 3 and 4, a floater (3010) for a floating marine wind power generator according to a first embodiment of the present invention may include columns (3110, 3120) and braces (3210, 3220).

[0107] In this embodiment, the brace may be represented as a connecting structure.

[0108] The columns (3110, 3120) may include a center column (3110) and outer columns (3120).

[0109] A wind turbine may be coupled to the center column (3110). The wind turbine may include, but is not limited to, a tower, a nacelle, blades, etc.

[0110] The outer columns (3120) may be configured to generate buoyancy so that the offshore wind turbine can float on the sea.

[0111] The number of outer columns (3120) may be three as illustrated in the drawing, but is not necessarily limited thereto. For example, the number of outer columns (3120) may be two or four or more.

[0112] The cross-sectional shape of each of the center column (3110) and the outer columns (3120) may be circular, but is not necessarily limited thereto.

[0113] Braces (3210, 3220) may include main braces (3210) and sub braces (3220).

[0114] Each of the main braces (3210) can connect the center column (3110) and the outer column (3120).

[0115] Each of the sub-braces (3220) can be connected to each other by the outer columns (3120).

[0116] Each of the center column (3110) and the outer columns (3120) may be provided with a sliding groove (SH).

[0117] The sliding groove (SH) can be formed so that the top is open and extends in a third direction (DR3).

[0118] Accordingly, each of the braces (3210, 3220) can be lifted by a crane (not shown) and slidably connected to the sliding groove (SH) through the open top of the sliding groove (SH). As a result, the degree of assembly of the braces (3210, 3220) can be adjusted in a short period of time.

[0119] Figure 5 is a front view of the center column of Figure 4.

[0120] Referring to Fig. 5, the lower end of the sliding groove (SH) can be closed by a stopper surface (SS). The stopper surface (SS) can be provided on each of the center column (3110) and the outer columns (3120).

[0121] As a result, the braces (3210, 3220) inserted into the sliding groove (SH) can be supported by the stopper surface (SS).

[0122] Additionally, the installation height of the braces (3210, 3220) can be determined by the stopper surface (SS).

[0123] The sliding home (SH) can extend to the upper surface of each of the columns (3110, 3120) and can be positioned so as to be spaced upward from the lower surface of each of the columns (3110, 3120).

[0124] Fig. 6 is a modified example of the sliding groove of Fig. 4.

[0125] Referring to FIGS. 4 and 6, the sliding groove (SH) may be provided in a sunken form on the outer surface (S) of each of the columns (3110, 3120) as shown in FIG. 4, but may also be provided on the outer surface (S) of the column by protrusions (P) provided on each of the columns (3110, 3120) as shown in FIG. 6.

[0126] Each of the protrusions (P) may protrude from the outer surface (S) of the column and extend in a third direction (DR3).

[0127] Each of the protrusions (P) may be continuous or partially disconnected in the third direction (DR3).

[0128] Fig. 7 is a modified example of the sliding groove of Fig. 5, and Fig. 8 is another modified example of the sliding groove of Fig. 5.

[0129] Referring to FIGS. 7 and 8, a first area (A1) and a second area (A2) can be defined in the sliding home (SH).

[0130] The first region (A1) may be a region in which the width (W) of the sliding groove (SH) is maintained constant along the longitudinal direction of the sliding groove (SH).

[0131] For example, the first region (A1) may be the region from the bottom of the sliding groove (SH), i.e., the stopper surface (SS), to the bottom of the second region (A2).

[0132] The second region (A2) may be a region from the top of the first region (A1) to the top of the sliding groove (SH), and may be a region in which the width (W) of the sliding groove (SH) increases as the height increases.

[0133] That is, the upper width of the second area (A2) may be greater than the lower width of the second area (A2).

[0134] As a result, the braces (3210, 3220) can be more easily inserted into the sliding groove (SH).

[0135] For example, the sliding groove (SH) can be defined by a curved surface in the second region (A2) as illustrated in FIG. 7.

[0136] As another example, the sliding groove (SH) can be partitioned by an inclined surface in the second area (A2) as illustrated in FIG. 8.

[0137] Fig. 9 is a front view of the main brace of Fig. 4, and Fig. 10 is a front view of the sub brace of Fig. 4.

[0138] Referring to FIGS. 9 and 10, each of the braces (3210, 3220) may include a first vertical bar (B1), a second vertical bar (B2), and connecting bars (B3).

[0139] The first vertical bar (B1) can be extended in the third direction (DR3) and inserted into the sliding groove (SH) of one of the columns (3110, 3120).

[0140] The second vertical bar (B2) can be extended in the third direction (DR3) and inserted into the sliding groove (SH) of another column among the columns (3110, 3120).

[0141] Each of the connecting bars (B3) can connect the first vertical bar (B1) and the second vertical bar (B2).

[0142] The main brace (3210) may be a square ring shape reinforced by inclined connecting bars (B3) as shown in FIG. 9.

[0143] For example, the main brace (3210) may be a W-shaped brace, but is not necessarily limited thereto, and may be designed as braces of various shapes, such as a K-shaped brace.

[0144] For example, the main brace (3210) may be designed as an N-shaped brace having a square ring shape composed of a first vertical bar (B1), a second vertical bar (B2), and a pair of connecting bars (B3), and a connecting bar (B3) that extends diagonally from the top of one of the first vertical bar (B1) and the second vertical bar (B2) to the bottom of the other of the first vertical bar (B1) and the second vertical bar (B2) in the square ring.

[0145] However, it is not necessarily limited to this, and the main brace (3210) may be formed in a square ring shape, similar to the sub brace (3220) illustrated in FIG. 10.

[0146] The sub-brace (3220) may be formed in a square ring shape as illustrated in FIG. 10.

[0147] The shape of the braces (3210, 3220) can be designed in various shapes other than the above-described shapes, taking into consideration the structural strength and the distance between the columns (3110, 3120).

[0148] FIGS. 11 to 13 are drawings for explaining the assembly process of a floater for a floating marine wind power generator according to the first embodiment of the present invention, and FIG. 14 is a cross-sectional view taken along line I-I of FIG. 13.

[0149] Referring to FIGS. 11 to 14, first, columns (3110, 3120) are arranged on the floor surface (G) of a shipyard yard, etc., with a predetermined distance between them, and then each of the braces (3210, 3220) is lifted with a crane to be slidably connected to the sliding grooves (SH) of the columns (3110, 3120).

[0150] Additionally, the open top of the sliding home (SH) can be closed by a finishing material (3300).

[0151] However, it is not necessarily limited to this, and the finishing material (3300) may be omitted.

[0152] Next, each of the first vertical bar (B1) and the second vertical bar (B2) of each of the braces (3210, 3220) can be fixed to each of the columns (3110, 3120) through a straight weld (WD) extending in the third direction (DR3).

[0153] As a result, welding work using automated equipment is possible, which can improve welding quality.

[0154] Additionally, automated robots can be applied to grinding operations, RT inspection, blasting, and painting operations of the welding line after welding.

[0155] However, it is not necessarily limited to this, and each of the braces (3210, 3220) may be fixed to each of the columns (3110, 3120) by means of rivets, bolts, etc.

[0156] Meanwhile, the cross-sectional shape of each of the first vertical bar (B1) and the second vertical bar (B2) may be a polygon, for example, a square.

[0157] In contrast, the cross-sectional shape of the third vertical bar (B3) may be polygonal or circular.

[0158] FIG. 17 is a perspective view showing an assembled state of a floater for a floating marine wind power generator according to a second embodiment of the present invention, FIG. 18 is a view showing a wind power generation device coupled to a floater for a floating marine wind power generator according to a second embodiment of the present invention, FIG. 19 is a plan view of a floater for a floating marine wind power generator according to a second embodiment of the present invention, FIG. 20 is a bottom view of a floater for a floating marine wind power generator according to a second embodiment of the present invention, FIG. 21 is a cross-sectional view taken along line "A" of FIG. 19, FIG. 22 is a cross-sectional view taken along line "B" of FIG. 19, FIG. 23 is a view showing an upper connecting portion and a lower connecting portion of an outer column, FIG. 24 is a view showing an upper connecting portion and a lower connecting portion of a central column, FIG. 25 is a view showing a lifting and adjusting appearance of an internal connecting structure, FIG. 26 is a view showing a lifting and adjusting appearance of an external connecting structure, and FIG. 27 is a view showing an installation process of a connecting structure.

[0159] A floating marine wind power generator (100) designed to be lightweight and mass-producible and specialized for assembly according to a second embodiment of the present invention may be a floating structure having buoyancy so as to be combined with a wind power generation device (150) and float on the sea.

[0160] Referring to FIG. 18, a wind power generation device (150) coupled to a floater (100) for a floating marine wind power generator is illustrated.

[0161] A wind power generation device (150) may include a tower (151), a nacelle (152), and blades (153).

[0162] The tower (151) is a supporting part of a wind power generation device (150) and can be combined with the central column (110). The tower (151) extends in one direction and can have a circular cross-section.

[0163] The nacelle (152) is a body part of a wind power generator (150) and may be provided at one end of a tower (151). The nacelle (152) may have a plurality of hubs, and a plurality of blades (153) may be coupled to the nacelle (152) through the hubs. For example, a plurality of hubs may be provided at 120-degree intervals on the nacelle (152).

[0164] The blade (153) is coupled to the nacelle (152) and may be a wing that rotates according to the wind. As illustrated in FIG. 18, three blades (153) may be coupled to the nacelle (152) at set angular intervals, but the number of blades (153) and the interval between them are not limited thereto.

[0165] Referring to FIG. 17, a floater (100) for a floating offshore wind turbine may include a central column (110), an outer column (120), an inner connecting structure (130), and an outer connecting structure (140).

[0166] The central column (110) and the outer column (120) are vertical column structures, and their cross-sections may have various shapes, such as circular or polygonal (square, pentagon, etc.). In the following, for the convenience of understanding and explaining the invention, the case where the cross-section of the outer column (120) is circular will be mainly described.

[0167] The outer column (120) is divided into a number of tank compartments, some of which function as void spaces with an interior, while others can function as ballast water tanks (WBT) that can be filled with ballast water. Accordingly, the interior of the outer column (120) can be filled with ballast water to float the floater (100) for an offshore wind turbine at a desired depth. In addition, in order to be able to respond to damage conditions due to collisions with boats or vessels, etc., void tank compartments that function as double bulkheads can be arranged around a collision zone (e.g., waterline) within the interior of the outer column (120) that takes the average water surface into account. In this case, only the minimum range required by the Rules & Regulations can be designed to minimize weight. For example, void tank compartments may be installed only in sections 3 m below and 5 m above the mean waterline and within a 240 degree range.

[0168] The outer circumference perpendicular to the longitudinal direction of the outer column (120) may be formed in a circular shape. Accordingly, when the outer column (120) is installed at sea, the influence of tidal currents or wave forces acting on the outer column (120) may be constant regardless of the direction of action.

[0169] As illustrated in the drawing, a plurality of outer columns (120) may be arranged at regular angular intervals (e.g., 120-degree intervals) centered around the central column (110). Accordingly, the floater (100) for a floating offshore wind turbine may be balanced so as not to topple over. For the convenience of understanding and explanation of the invention, the following description will assume that three outer columns (120) are arranged in a triangular shape centered around the central column (110).

[0170] The central column (110) may be a portion to which a tower (151) of a wind power generation device (150) is coupled. The central column (110) is positioned at the central portion of a floater (100) for a floating offshore wind power generator, and a tower (151) may be coupled to the upper portion of the central column (110).

[0171] The central column (110) is a vertical column structure, and its cross-section may have various shapes, such as a circle or a polygon. In the following, for the convenience of understanding and explaining the invention, the case where the cross-section of the central column (110) is circular will be mainly described.

[0172] The outer circumference perpendicular to the longitudinal direction of the central column (110) may be formed in a circular shape. Accordingly, when the central column (110) is installed at sea, the influence of tidal currents or wave forces acting on the central column (110) may be constant regardless of the direction of action.

[0173] The internal connection structure (130) is a structure installed between the outer column (120) and the central column (110) and can establish an internal connection structure (i.e., the inner center line portion of the triangle) of a floater (100) for a floating offshore wind power generator.

[0174] The external connecting structure (140) is a structure installed between the outer columns (120) and can establish an external connecting structure (i.e., a corner portion of a triangle) of a floater (100) for a floating offshore wind power generator.

[0175] The internal connecting structure (130) and / or the external connecting structure (140) may be a weight-improved structure having an integrally formed brace frame structure instead of a pontoon and a deck box.

[0176] The internal connecting structure (130) may include an inner upper horizontal support (131), an inner lower horizontal support (132), an inner diagonal support (133), a first inner vertical support (134a), and a second inner vertical support (134b). The vertical supports (134a, 134b) may be installed to prevent deformation of the connecting structure during movement and lifting, and for quality control. In addition, they may be installed as members that play a structural role.

[0177] An inner upper horizontal support (131) may be connected between the upper end of the first inner vertical support (134a) and the upper end of the second inner vertical support (134b). An inner lower horizontal support (132) may be connected between the lower end of the first inner vertical support (134a) and the lower end of the second inner vertical support (134b). An inner diagonal support (133) may be connected between the lower end of the first inner vertical support (134a) and the upper end of the second inner vertical support (134b).

[0178] A lower outer fastening member (137) for connection to the lower part of the outer column (120) may be provided at the lower end of the first inner vertical support member (134a), and one end of the inner lower horizontal support member (132) and one end of the inner diagonal support member (133) may be fastened to the lower outer fastening member (137).

[0179] The upper end of the second inner vertical support (134b) may be provided with an upper central fastening portion (136) for connection to the upper end of the central column (110), and one end of the inner upper horizontal support portion (131) and the other end of the inner diagonal support portion (133) may be fastened to the upper central fastening portion (136).

[0180] A lower central fastening portion (138) for coupling to the lower portion of the central column (110) may be provided at the lower end of the second inner vertical support portion (134b), and the other end of the inner lower horizontal support portion (132) may be fastened to the lower central fastening portion (138).

[0181] The other end of the inner upper horizontal support member (131) may be provided with an upper outer fastening member (135) for connection to the sunken deck (121) on the upper side of the outer column (120).

[0182] An internal connecting structure (130), particularly an inner upper horizontal support member (131), is provided with a lifting point to enable transportation and lifting using a crane. In addition, a passage and a handrail are installed on the inner upper horizontal support member (131), enabling a worker to move between the outer column (120) and the central column (110).

[0183] The external connecting structure (140) may include an outer upper horizontal support (141), an outer lower horizontal support (142), first to second outer diagonal supports (143a to 143b), and first to third outer vertical supports (144a to 144c). The vertical supports (144a to 144c) may be installed to prevent deformation of the connecting structure during movement and lifting, and for quality control. In addition, they may be installed as structural members.

[0184] The external connecting structure (140) is a structure connecting two outer columns (120) spaced apart from each other by a considerable distance, and the outer upper horizontal support member (141) and the outer lower horizontal support member (142) may have a length corresponding to the distance between the two outer columns (120). In order to connect the outer column (120) to the sunken deck (121), the length of the outer upper horizontal support member (141) may be formed to be longer than the length of the outer lower horizontal support member (142).

[0185] In order to horizontally support the long outer upper horizontal support (141) and the outer lower horizontal support (142), first to third outer vertical supports (144c) may be installed between the outer upper horizontal support (141) and the outer lower horizontal support (142). A first outer diagonal support (143a) may be installed between the first outer vertical support (144a) and the second outer vertical support (144b), and a second outer diagonal support (143b) may be installed between the second outer vertical support (144b) and the third outer vertical support (144c).

[0186] The upper end of the first outer vertical support (144a) and the upper end of the first outer diagonal support (143a) may be connected to one end of the outer upper horizontal support (141). The upper end of the third outer vertical support (144c) and the upper end of the second outer diagonal support (143b) may be connected to the other end of the outer upper horizontal support (141).

[0187] The lower end of the first outer vertical support (144a) may be connected to one end of the outer lower horizontal support (142), and the lower end of the third outer vertical support (144c) may be connected to the other end. The second outer vertical support (144b) may be connected between any point (e.g., the center) between one end and the other end of the outer upper horizontal support (141) and any point (e.g., the center) between one end and the other end of the outer lower horizontal support (142). The lower end of the first outer diagonal support (143a) and the lower end of the second outer diagonal support (143b) may be connected to any point (e.g., the center) between one end and the other end of the outer lower horizontal support (142).

[0188] An external connecting structure (140), particularly an outer upper horizontal support (141), is provided with a fixing point so that transportation and lifting by a crane can be possible.

[0189] A sunken deck (121) may be provided on the upper portion of the outer column (120). The sunken deck (121) is a deck for joining the internal connection structure (130) and the external connection structure (140), and may be manufactured lower than the upper deck of the outer column (120). The sunken deck (121) may have a structure that spreads out to the left and right by a predetermined angle centered on a point closest to the central column (110) on the upper surface of the outer column (120). The spreading angle of the sunken deck (121) may be, for example, 90 to 120 degrees.

[0190] The sunken deck (121) may be a section for easy access and safety for assembly, inspection, welding, and other tasks. This sunken deck (121) may be divided into three connecting spaces (121a, 121b).

[0191] An internal connecting structure (130), particularly an upper outer fastening portion (135), can be coupled to the central coupling space (121a). A first outer upper horizontal bracket (122) having a multi-layer structure that restricts left-right movement of the upper outer fastening portion (135) can be provided in the central coupling space (121a). A guide groove (1221) corresponding to a portion of the cross-section of the upper outer fastening portion (135) is formed in the first outer upper horizontal bracket (1222), so that the upper outer fastening portion (135) can be inserted and installed within the guide groove (1221).

[0192] An external connecting structure (140), particularly one of both ends of an outer upper horizontal support (141), may be connected to the outer connecting space (121b) on the left and right. A pair of second outer upper horizontal brackets (123) that restrict left-right movement of the outer upper horizontal support (141) may be provided in the outer connecting space (121b). A groove corresponding to the width of the outer upper horizontal support (141) is formed between the pair of second outer upper horizontal brackets (123), so that the ends of the outer upper horizontal support (141) may be fitted and connected. In addition, the outer connecting space (121b) may further include an upper vertical bracket and stopper (124) installed on the bottom surface. The upper vertical bracket and stopper (124) can fix the height by securing the outer upper horizontal support (141) fitted between a pair of second outer upper horizontal brackets (123).

[0193] A connecting structure mounting portion (220) including a stopper and a bracket for mounting a connecting structure (130, 140) may be provided at the lower portion of the outer column (120), particularly at the portion facing the central column (110).

[0194] The connecting structure anchoring portion (220) may have a structure that is spread out to the left and right by a predetermined angle corresponding to the sunken deck (121). The connecting structure anchoring portion (220) may be divided into three anchoring spaces (220a, 220b).

[0195] In the central settling space (220a), an internal connecting structure (130), particularly a lower outer fastening portion (137), can be settling, and in the left and right outer settling spaces (220b), an external connecting structure (140), particularly one of the two ends of an outer lower horizontal support portion (142) can be settling.

[0196] A central stopper (221) that restricts the descent of the lower outer fastening portion (137) may be installed in the central mounting space (220a). Accordingly, the lower outer fastening portion (137) may be placed on the central stopper (221). In addition, a central bracket (222) may be provided in the central mounting space (220a). The lower outer fastening portion (137) placed on the central stopper (221) may have its left-right movement restricted by the central bracket (222).

[0197] An outer bracket (223) that restricts the left-right movement of the outer lower horizontal support (142) and an outer vertical bracket / stopper (224) that restricts the descent of the outer lower horizontal support (142) may be installed in the outer mounting space (220b). Accordingly, the outer lower horizontal support (142) may be placed on the outer vertical bracket / stopper (224), and its left-right movement may be restricted by the outer bracket (223) so that it may be stably mounted.

[0198] A multi-layered upper guide bracket (111) may be provided on the upper portion of the central column (110), and a multi-layered lower guide bracket (211) may be provided on the lower portion. The upper guide bracket (111) and the lower guide bracket (211) may be installed at points facing the outer column (120) on the outer circumference of the central column (110). For example, in the present embodiment, the upper guide bracket (111) and the lower guide bracket (211) may be installed at three points at 120-degree intervals.

[0199] The upper guide bracket (111) has a first guide groove (1111) formed corresponding to a portion of the cross-section of the upper central fastening portion (136), so that the upper central fastening portion (136) can be inserted and installed within the first guide groove (1111).

[0200] The lower guide bracket (211) is formed with a second guide groove (2111) corresponding to a portion of the cross-section of the lower central fastening portion (138), so that the lower central fastening portion (138) can be inserted and installed within the second guide groove (2111). In addition, an inner stopper (212) is installed below the lower guide bracket (211), so that the lower central fastening portion (138) inserted and installed in the lower guide bracket (211) can be seated on the inner stopper (212).

[0201] At least one of all vertical brackets, horizontal brackets, and stoppers according to the present embodiment may require structural reinforcement due to the results of structural strength analysis, fatigue analysis, etc. suitable for the sea area, and this may be reflected in the form of additional bracket installation, shape change, etc.

[0202] A non-slip support (310) may be installed on the lower surface of the central column (110). The non-slip support (310) may support the central column (110) at a predetermined height from the floor of the work place, but may also be fixedly supported so that the central column (110) does not move. The non-slip support (310) may not be provided with a sliding pad.

[0203] A slip support (320) may be installed on the lower surface of the outer column (120). The slip support (320) may support the outer column (120) at a predetermined height from the floor of the work place, and may be a sliding support so that the outer column (120) can slide and move within a predetermined range to adjust its position. This may be to adjust the position of the outer column (120) if necessary after installation of the internal connecting structure (130). The slip support (320) may be equipped with a sliding pad.

[0204] Referring to Figure 27, a method of installing a connecting structure in the final assembly process is illustrated.

[0205] First, the outer columns (120) can be arranged in a triangular configuration, and the central column (110) can be arranged at the center. A non-slip support (310) can be installed on the lower surface of the central column (110) to provide fixed support. A slip support (320) can be installed on the lower surface of the outer columns (120) to provide support that can be adjusted in position when necessary.

[0206] Next, the internal connecting structure (130) can be lifted up using a crane and transported between the central column (110) and the outer column (120) (see (a) of FIG. 27).

[0207] Next, the internal connecting structure (130) can be aligned between the central column (110) and the outer column (120) and lowered for insertion installation (see (b) and (c) of FIG. 27).

[0208] At this time, the upper outer fastening portion (135) of the internal connecting structure (130) may be placed within the central joining space (121a) of the sunken deck (121) of the outer column (120), and the lower outer fastening portion (137) may be placed within the central mounting space (220a) of the connecting structure mounting portion (220) of the outer column (120). The lower outer fastening portion (137) may be mounted on the central stopper (221) of the central mounting space (220a), and left-right movement may be restricted by the central bracket (222).

[0209] Additionally, the upper central fastening portion (136) of the internal connecting structure (130) may be placed between the upper guide brackets (111) of the central column (110), and the lower central fastening portion (138) may be placed between the lower guide brackets (211) of the central column (110). The lower central fastening portion (138) may be seated on the inner stopper (212), and its left-right movement may be limited by the lower guide bracket (211).

[0210] During this process, the position of the outer column (120) can be adjusted if necessary so that the internal connecting structure (130) is firmly installed between the outer column (120) and the central column (110). Afterwards, the crane hook can be released.

[0211] The above process can be repeated for three internal connection structures (130) to complete the internal structure of the floater (100) for a floating offshore wind turbine.

[0212] Next, the external connecting structure (140) can be lifted up using a crane. Then, it can be transported between the outer columns (120) (see (d) of Fig. 27).

[0213] An external connecting structure (140) can be aligned between two outer columns (120) and lowered and inserted, like an internal connecting structure (130).

[0214] Both ends of the outer upper horizontal support (141) of the outer connecting structure (140) can be placed within the outer joining space (121b) of the sunken deck (121) of the outer column (120). Left-right movement can be restricted by the second outer upper guide bracket (111) within the outer joining space (121b).

[0215] Both ends of the outer lower horizontal support (142) of the external connecting structure (140) can be placed within the outer mounting space (220b) of the outer column (120). The outer lower horizontal support (142) can be mounted on an outer vertical bracket and stopper (224) within the outer mounting space (220b), and left-right movement can be restricted by the outer bracket (223).

[0216] The above process can be repeated for three external connection structures (140) to complete the external structure of the floater (100) for a floating offshore wind turbine.

[0217] According to this embodiment, a self-weight improved plotter can be provided that is designed to be able to complete one final assembly task (setting / welding / inspection / painting / loadout) per week.

[0218] Additionally, the overall weight can be reduced by applying a connecting structure with a brace frame structure instead of a pontoon and deck box.

[0219] In addition, the stability of the floater can be optimized through the column compartment arrangement that divides the internal space of the outer column and the central column into multiple spaces and separates them into void spaces and equilibrium water tanks.

[0220] Additionally, the column and connecting structure are separated, facilitating the movement and installation of each unit during the final assembly process. Furthermore, the "insert-into" concept, where the connecting structure is inserted into a bracket installed on the column, facilitates connection.

[0221] When a connecting structure is lifted and inserted between columns using a crane, it automatically becomes self-standing, allowing for immediate hook load release immediately after installation. Depending on the crane's lifting height limitations, the connecting structure can also be lowered from the side for installation.

[0222] Furthermore, it can absorb misalignment, such as manufacturing errors and lifting deflection of the connecting structure. For internal connecting structures, misalignment can be overcome by applying sliding pads (e.g., PTFE) to the supports installed under the external columns during setup, thereby facilitating adjustment of the external columns. For external connecting structures, deflection can occur due to the long distance between supports, and the long distance between pad eyes during lifting can lead to unpredictable deflection. To address this, misalignment and deflection can be absorbed by incorporating tolerance gaps in the axial and left-right directions.

[0223] Furthermore, workability can be improved by ensuring that welding, inspection, and painting are sufficiently performed outside the structure during the final assembly process. By applying a closed tubular structure and ensuring internal dead space, the need for inside painting repairs can be eliminated due to burn damage that can occur during external welding.

[0224] Additionally, after assembling the connecting structure, welding can be performed at the ends of each column bracket, eliminating the need for internal column welding or inside painting repairs due to heat damage. Furthermore, work in confined spaces can be eliminated, and separate tank testing can be eliminated during the assembly stage.

[0225] Additionally, consideration may be given to preventing high-altitude work and minimizing footwork when determining the connection location with the column side.

[0226] Figures 28 and 29 are drawings for explaining the chief platform mounted on the central column.

[0227] The scaffolding platform (500) is a device for worker access. It can be quickly installed and removed for temporary scaffolding. It may also incorporate safety features such as handrails, ladders, and frames.

[0228] Additionally, the chief platform (500) may include a pad eye (520) that can be attached to a crane hook to enable installation and removal using a crane for repeated use.

[0229] Additionally, the foot platform (500) may include a connecting clamp (510) for quick attachment and detachment. The connecting clamp (510) may be of a pin or bolt type. Additionally, a protective pad (530) may be installed at the point where it meets the connecting bracket (540) to prevent damage during attachment and detachment. The connecting bracket (540) may be a first outer upper guide bracket (111) provided on the upper portion of the central column (110).

[0230] The Chief Platform (500) ensures safety and improves accessibility when performing high-altitude tasks such as welding, gouging, inspection, and painting. Furthermore, it is easily detachable and reusable for subsequent use.

[0231] A fairlead (129) may be installed on the outer column (120) of the floater (100) for a floating offshore wind power generator according to the present embodiment.

[0232] The fairlead (129) is easy to install with a mooring line, and its height can be determined by considering collision when an access boat approaches. When the compartment that functions as a ballast water tank among the tank compartments is not filled with ballast water, the fairlead (129) is positioned above the water surface, so that the mooring line connection work can be performed easily and safely. In addition, when the ballast water is filled up to the operating draft, the fairlead (129) is positioned at a predetermined depth (e.g., 3 m deep) below the water surface, so that the access boat can avoid the risk of collision when approaching.

[0233] The floater (100) for a floating marine wind power generator according to the present embodiment can be applied to wind power generation devices of various capacities.

[0234] In addition, although the present embodiment has been described with a focus on the case where the sunken deck is provided on the outer column, a sunken deck may also be provided on the central column as needed.

[0235] Figures 30 to 32 are drawings for explaining examples of deformation of the lower connecting portion of the outer column.

[0236] Fig. 30 may be a plan view of the lower connection part of the outer column, Fig. 31 may be a side view of the lower connection part of the outer column, and Fig. 32 may be a front view of the lower connection part of the outer column, respectively.

[0237] Referring to FIGS. 30 to 32, the outer bracket (223) may include a pair of sub-brackets (223a, 223b). The pair of sub-brackets (223a, 223b) may be arranged on the outer surface of the outer column (120) so as to be spaced apart from each other along the circumferential direction of the outer column (120).

[0238] Accordingly, the outer lower horizontal support (142) can be inserted between a pair of sub-brackets (223a, 223b) to limit left-right movement.

[0239] Meanwhile, each of a pair of sub-brackets (223a, 223b) and an outer vertical bracket and stopper (224) may be directly coupled to the outer column (120). The sub-brackets (223a, 223b) may have a plate shape perpendicular to the longitudinal direction of the outer column (120), and the outer vertical bracket and stopper (224) may have a plate shape extending in the longitudinal direction of the outer column (120).

[0240] The above-described descriptions of the outer bracket (223) and the outer vertical bracket / stopper (224) can also be applied to the outer bracket (223) and the outer vertical bracket / stopper (224) illustrated in FIG. 23.

[0241] In this modified example, there may be a difference in that a pair of lower connecting brackets (225) and a pair of upper connecting brackets (226) are additionally installed in the outer mounting space (220b).

[0242] A pair of lower connecting brackets (225) can connect each of a pair of sub-brackets (223a, 223b) to an outer vertical bracket and stopper (224).

[0243] As a result, some of the vertical load acting on the outer vertical bracket / stopper (224) by the outer lower horizontal support (142) can be distributed to a pair of sub-brackets (223a, 223b).

[0244] In some embodiments, one of the pair of lower connecting brackets (225) may extend from one side of the outer vertical bracket-cum-stopper (224) to the underside of the first sub-bracket (223a) of the pair of sub-brackets (223a, 223b), and the other of the pair of lower connecting brackets (225) may extend from the other side of the outer vertical bracket-cum-stopper (224) to the underside of the second sub-bracket (223b) of the pair of sub-brackets (223a, 223b).

[0245] A pair of upper connecting brackets (226) can connect each of a pair of sub-brackets (223a, 223b) to the outer column (120).

[0246] As a result, some of the vertical load transmitted to the pair of sub-brackets (223a, 223b) through the pair of lower connecting brackets (225) can be distributed to the pair of upper connecting brackets (226).

[0247] In some embodiments, one of the pair of upper connecting brackets (226) may extend from the upper surface of the first sub-bracket (223a) to the outer periphery of the outer column (120), and the other of the pair of upper connecting brackets (226) may extend from the upper surface of the second sub-bracket (223b) to the outer periphery of the outer column (120).

[0248] While the above description focuses on preferred embodiments of the present invention, these are merely examples and are not intended to limit the present invention. Those skilled in the art will appreciate that various modifications and variations of the embodiments can be made by adding, modifying, deleting, or adding components, without departing from the technical spirit of the present invention as defined in the claims. Such modifications and variations are also considered to fall within the scope of the present invention.

Claims

1. Columns; and A floater for a floating offshore wind turbine, comprising connecting structures connecting the above columns.

2. In paragraph 1, Each of the above columns is provided with a sliding groove that is open at the top and extends in the vertical direction, A floater for a floating offshore wind turbine, wherein each of the above connecting structures is slidably coupled to the sliding groove through the open top.

3. In paragraph 2, A floater for a floating offshore wind turbine, wherein the above sliding groove is provided in a sunken form on the outer surface of the column.

4. In paragraph 2, Each of the above columns has at least two protrusions protruding from the outer surface, A floater for a floating offshore wind turbine, wherein the sliding groove is provided on the outer surface by the protrusions.

5. In paragraph 2, A floater for a floating offshore wind turbine, the lower end of the above sliding groove being closed by a stopper surface.

6. In paragraph 2, A floater for a floating offshore wind power generator, wherein the sliding groove defines a first region having a constant width, and a second region having a width that increases as the height increases from the top of the first region to the top of the sliding groove.

7. In paragraph 2, A floater for a floating offshore wind turbine, further comprising a finishing material coupled to the upper portion of the sliding groove.

8. In paragraph 2, Each of the above connecting structures, A first vertical bar inserted into the sliding groove of one of the columns and extending in the vertical direction; A second vertical bar inserted into the sliding groove of another column among the above columns and extending in the vertical direction; and A floater for a floating offshore wind turbine, comprising connecting bars connecting the first vertical bar and the second vertical bar.

9. In paragraph 8, A floater for a floating offshore wind power generator, wherein each of the first vertical bar and the second vertical bar has a polygonal cross-sectional shape.

10. In paragraph 8, A floater for a floating offshore wind turbine, wherein each of the first vertical bar and the second vertical bar is fixed to the column through a straight weld extending in the vertical direction.

11. In paragraph 1, The above columns are, A central column having a wind turbine attached to the upper surface; and It includes a plurality of outer columns spaced at regular angular intervals around the central column and providing buoyancy, The above connecting structures are, An internal connecting structure installed between the central column and the outer column to establish an internal connecting structure; and A floater for a floating offshore wind turbine, comprising an external connection structure installed between the plurality of outer columns to establish an external connection structure.

12. In paragraph 11, A floater for a floating offshore wind power generator, wherein at least one of the internal connecting structure and the external connecting structure has a brace frame structure.

13. In paragraph 11, The above internal connecting structure includes an inner upper horizontal support, an inner lower horizontal support, an inner diagonal support, a first inner vertical support, and a second inner vertical support, A floater for a floating offshore wind turbine, wherein the inner upper horizontal support is connected between the upper end of the first inner vertical support and the upper end of the second inner vertical support, the inner lower horizontal support is connected between the lower end of the first inner vertical support and the lower end of the second inner vertical support, and the inner diagonal support is connected between the lower end of the first inner vertical support and the upper end of the second inner vertical support.

14. In paragraph 13, The above internal connection structure is, A lower outer fastening member for connection to the lower part of the outer column, which is provided at the lower end of the first inner vertical support member and to which one end of the inner lower horizontal support member and one end of the inner diagonal support member are fastened; An upper central fastening portion provided on the upper end of the second inner vertical support portion and for fastening to the upper end of the central column to which one end of the inner upper horizontal support portion and the other end of the inner diagonal support portion are fastened; A lower central fastening portion provided at the lower end of the second inner vertical support portion and for connection to the lower end of the central column to which the other end of the inner lower horizontal support portion is fastened; and A floater for a floating offshore wind turbine, which is provided on the other end of the inner upper horizontal support and further includes an upper outer fastening member for connection to the upper portion of the outer column.

15. In paragraph 11, The above external connecting structure includes an outer upper horizontal support, an outer lower horizontal support, first to second outer diagonal supports, and first to third outer vertical supports, The upper end of the first outer vertical support and the upper end of the first outer diagonal support are connected to one end of the outer upper horizontal support, and the upper end of the third outer vertical support and the upper end of the second outer diagonal support are connected to the other end of the outer upper horizontal support. The lower end of the first outer vertical support is connected to one end of the outer lower horizontal support, and the lower end of the third outer vertical support is connected to the other end. A floater for a floating offshore wind power generator, wherein the second outer vertical support is connected between any point between one end and the other end of the outer upper horizontal support and any point between one end and the other end of the outer lower horizontal support, and the lower end of the first outer diagonal support and the lower end of the second outer diagonal support are connected to any point between one end and the other end of the outer lower horizontal support.

16. In paragraph 11, A floater for a floating offshore wind turbine, wherein the outer column is manufactured lower than the upper deck and further includes a sunken deck for joining the inner connecting structure and the outer connecting structure.

17. In paragraph 16, A floating offshore wind turbine floater, wherein the sunken deck is divided into three joining spaces, including a central joining space where the upper outer fastening portion of the inner joining structure is joined and left and right outer joining spaces where the outer upper horizontal support portion of the outer joining structure is joined.

18. In paragraph 17, The central joint space is provided with a first outer upper horizontal bracket of a multi-layer structure that restricts left-right movement of the upper outer fastening portion. A floater for a floating offshore wind power generator, wherein a guide groove corresponding to a portion of the cross-section of the upper outer fastening portion is formed on the first outer upper horizontal bracket.

19. In paragraph 17, The outer joint space is provided with a pair of second outer upper horizontal brackets that limit the left-right movement of the outer upper horizontal support. A floater for a floating offshore wind power generator, wherein an upper stopper is installed on the bottom surface of the second outer upper horizontal bracket of the pair, on which one end of the outer upper horizontal support is secured.

20. In paragraph 11, A floater for a floating offshore wind power generator, wherein the outer column further includes a connecting structure mounting portion provided at the bottom and including a stopper and a bracket for mounting the inner connecting structure and the outer connecting structure.

21. In paragraph 20, A floating offshore wind power generator, wherein the connecting structure mounting portion includes a central mounting space in which the lower outer fastening portion of the inner connecting structure is mounted, and an outer mounting space disposed on the left and right of the central mounting space in which the outer lower horizontal support portion of the outer connecting structure is mounted.

22. In paragraph 21, A floater for a floating offshore wind power generator, wherein a central stopper for limiting the descent of the lower outer fastening part and a central bracket for limiting the left-right movement of the lower outer fastening part are installed in the central mounting space.

23. In paragraph 21, A floating offshore wind power generator, wherein an outer bracket for limiting left-right movement of the outer lower horizontal support and an outer vertical bracket / stopper for limiting descent of the outer lower horizontal support are installed in the outer mounting space.

24. In paragraph 23, The above outer bracket includes a pair of sub-brackets each directly connected to the above outer column, The above pair of sub-brackets are spaced apart from each other along the circumference of the outer column, The above outer vertical bracket and stopper is directly connected to the above outer column. In the above outer mounting space, a pair of lower connecting brackets connecting each of the pair of sub-brackets to the outer vertical bracket and stopper, and a pair of upper connecting brackets connecting each of the pair of sub-brackets to the outer column are additionally installed. The above sub-bracket is a plate shape perpendicular to the longitudinal direction of the outer column, The above outer vertical bracket and stopper is a plate shape extending in the longitudinal direction of the outer column, A floater for a floating offshore wind turbine, wherein the lower connecting bracket extends from the lower surface of the sub-bracket to the side of the outer vertical bracket and stopper, and the upper connecting bracket extends from the upper surface of the sub-bracket to the outer circumference of the outer column.

25. In paragraph 11, A floating offshore wind power generator, wherein a multi-layered upper guide bracket is provided on the upper portion of the central column, in which a first guide groove corresponding to the upper central fastening portion of the internal connecting structure is formed, and a multi-layered lower guide bracket is provided on the lower portion, in which a second guide groove corresponding to the lower central fastening portion of the internal connecting structure is formed.

26. In paragraph 11, A floater for a floating offshore wind turbine, wherein a void tank compartment is formed that functions as a double bulkhead for a collision zone considering the average water level inside the outer column.

27. In a method for assembling a floater for a floating marine wind turbine, A step of arranging a central column and multiple outer columns in a work area; A step of using a crane to lift up the internal connecting structure and move it laterally to align it between the central column and the outer column; A step of lowering the internal connecting structure using the crane to make it self-supporting so as to establish an internal connecting structure between the central column and the outer column; A step of using the above crane to lift up the external connecting structure and move it laterally to align it between the plurality of outer columns; and A method for assembling a floater for a floating offshore wind turbine, comprising the step of lowering the external connecting structure using the crane to establish an external connecting structure between the plurality of outer columns so as to make it self-supporting.

28. In paragraph 27, A method for assembling a floater for a floating offshore wind power generator, wherein a non-slip support is installed on the lower surface of the central column and a slip support is installed on the lower surface of the outer column, thereby enabling position adjustment of the outer column after installation of the internal connecting structure during the final assembly process.

29. In paragraph 27, A method for assembling a floater for a floating offshore wind power generator, wherein the self-supporting step is an insert-into method in which the internal connection structure and the external connection structure are inserted into brackets provided on the central column and the outer column.

30. In paragraph 27, A method for assembling a floater for a floating offshore wind turbine, wherein a detachable foot platform is installed on the upper part of the central column as a device for worker access, thereby enabling high-altitude work to be performed.

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