TWI714708B - Offshore wind power generation equipment and construction method thereof - Google Patents

Abstract

There is no need to carry out operations using special ships at sea, which can achieve improved workability and reduced work It can reduce the manufacturing cost of offshore wind power generation equipment.

The invention provides an offshore wind power generation equipment and a construction method thereof. The feature of the power generation equipment is that it has: a basic structure 2, which is formed in a circular shape when viewed from the top with the tower 3 as the center, and consists of a central portion 7 arranged on the center side in the radial direction and arranged on the outer periphery Section 8 constitutes. The center part 7 is composed of a plurality of concrete center-side prefabricated boxes 9 divided into a plurality of outer shapes in the circumferential direction, and is formed by connecting the center-side prefabricated boxes 9 in the circumferential direction; 8. It is composed of a plurality of concrete outer peripheral side prefabricated boxes 10 divided into a plurality of outer shapes in the circumferential direction, and is formed by connecting the outer peripheral side prefabricated boxes 10 in the circumferential direction. The central part 7 and the outer peripheral part 8 are joined at a circumferential contact surface, and the basic structure of the above-mentioned basic structure is that ballast is only injected into the central part, and a buoyancy is generated in the outer peripheral part 8 to be implanted on the seabed.

Description

Offshore wind power generation equipment and construction method thereof

The invention relates to a built-in offshore wind power generation equipment and a construction method thereof.

Traditionally, although hydropower, thermal power, and nuclear power are mainly used for power generation, in recent years, from the viewpoint of the environment and the effective use of natural energy, wind power generation using natural wind has attracted attention. Although this wind power generation equipment can be installed on land and on water (mainly offshore), for Japan, which has mountainous terrain from the coastal area to the back, there are few coastal areas with plains with stable winds. situation. On the other hand, Japan is surrounded by the sea, and wind suitable for power generation can be easily obtained on the sea, and it has the advantages of fewer restrictions on installation. Therefore, there have been many proposals for offshore wind power generation equipment in recent years.

Offshore wind power generation equipment, depending on the installation method of the basic structure, can be an implantation type that can be installed on the seafloor such as a pipe frame foundation (Patent Document 1 below) or a diving tank foundation (Patent Document 2 below); Pontoon type (Patent Document 3 below); Semi-Submersible type (Patent Documents 4 and 5 below): Spar type (Patent Document 6 below) floating on the sea surface Or floating in the sea.

【Prior Technical Literature】 【Patent Literature】

[Patent Document 1] JP 2015-4351 A

[Patent Document 2] JP 2006-322400 A

[Patent Document 3] Japanese Patent Application Publication No. 2001-165032

[Patent Document 4] JP 2007-160965 A

[Patent Document 5] Japanese Patent Application Publication No. 2007-331414

[Patent Document 6] JP 2009-18671 A

However, the construction of the aforementioned implanted offshore wind power equipment will be more used in the installation of the foundation and the assembly of the windmill, such as self-elevating work platform ships (SEP ships) or large crane ships (FC ships) The offshore operations of special ships used for operations are therefore restricted due to existing numbers or restricted operating days due to changes in weather, etc., which may result in deterioration of operational efficiency and increased operating costs. In addition, when fins or generators fail or have problems, special ships such as SEP ships or large FC ships must also be used for offshore operations, so the same problem will occur.

On the other hand, the aforementioned floating body type uses special ships such as large FC ships for the purpose of ensuring the stability of the floating body and preventing it from overturning during the operation of berthing the floating body. Therefore, it is the same as the above. There is a problem that the utilization rate of the operation deteriorates and the operation cost increases.

In addition, the above-mentioned implantation type pipe frame type foundation or floating type semi-submersible type floating body, etc., have the problems of difficulty in mass production and high manufacturing cost due to the use of most steel materials.

Furthermore, when the implanted foundation is sunk on the bottom of the sea to float up, if it is particularly inclined near the water's edge, the foundation structure that appears on the surface of the water will be subjected to great gravity inertia, and there will be a lot of protruding upwards. After impinging water, in the worst case, it may cause problems such as the possibility of damage to the infrastructure.

The main subject of the present invention here is to provide an offshore wind power generation equipment and its construction method, which does not require the use of special ships at sea, and achieves improved workability and reduced operating costs, while reducing manufacturing costs, and Stability and safety when the basic structure sinks and floats to the sea bottom.

In order to solve the above-mentioned problems, the present invention in the first item of the scope of patent application is to provide an offshore wind power generation equipment characterized in that it is composed of a basic structure installed on the seabed in an implanted state, and a foundation structure built on this basic structure. The erected tower, the nacelle equipped on the top of the tower, and the offshore wind turbine fins formed by a plurality of windmill fins; and the aforementioned basic structure is formed in a circular shape when viewed from the top with the aforementioned tower as the center, and It is composed of a central part arranged on the central side in the radial direction and a peripheral part arranged on the outer periphery; the aforementioned central part is made of a central side prefabricated made of plural concrete divided into plural outer shapes in the circumferential direction The box is formed by connecting the aforementioned center-side prefabricated boxes in the circumferential direction; the aforementioned outer peripheral part is composed of a plurality of concrete outer-peripheral prefabricated boxes that are divided into a plurality of outer shapes in the circumferential direction. It is made of the aforementioned outer peripheral side prefabricated box in the circumferential direction It is constituted by the connection, and the aforementioned central part and the outer peripheral part are joined in the circumferential direction contact surface.

According to the invention described in item 1 of the scope of the above-mentioned patent application, the basic structure of the offshore wind power plant is formed in a circular shape in plan view with the aforementioned tower as the center, and is composed of a central part arranged on the center side in the radial direction, And arranged on the outer periphery of the outer periphery. In addition, the center portion is formed by a plurality of concrete center-side prefabricated boxes divided into a plurality of outer shapes in the circumferential direction, and the center-side prefabricated boxes are connected in the circumferential direction. In addition, the outer peripheral portion is formed by a plurality of concrete outer peripheral side prefabricated boxes divided into a plurality of outer shapes in the circumferential direction, and is formed by connecting the outer peripheral side prefabricated boxes in the circumferential direction.

Therefore, through the construction steps described later, the assembly of offshore wind power generation equipment can be completed in the waters near the quay wall. After the offshore wind power generation equipment is towed to the sea, the ballast is put in to make the foundation structure implanted. It is necessary to use special ships at sea to assemble offshore wind power generation equipment, which can improve workability and reduce operating costs. In addition, since the basic structure is composed of a prefabricated box made of concrete, the manufacturing cost of mass production can be easily reduced.

In addition, the central part and the outer peripheral part are joined in a circumferential direction contact surface, and the central part and the outer peripheral part have an integral structure.

The invention described in item 2 of the scope of patent application provides the offshore wind power generation equipment described in item 1 of the scope of patent application, wherein the above-mentioned basic structure is ballasted into the aforementioned central part, and the aforementioned outer peripheral part is not injected Ballast or reduce the amount of ballast, and the aforementioned outer peripheral part is buoyant and land on the seabed.

The invention described in item 2 of the scope of the aforementioned application, the aforementioned basic structure, It is a structure in which ballast is thrown into the center portion, ballast is not thrown into the outer peripheral portion, or the amount of ballast is reduced, and the structure is implanted on the seabed in a state where the outer peripheral portion generates buoyancy.

Therefore, when the implanted foundation is sunk on the seabed or floated, the buoyancy of the outer periphery allows the foundation structure itself to be kept horizontal and stable, especially near the water surface, when the foundation structure is inclined. Relative to the buoyancy of the sinking side, due to the buoyancy phenomenon of the floating side, the force that makes the foundation structure automatically maintain the level (restoring force) when the action is tilted, so that it has dynamic stability.

The invention described in item 3 of the scope of patent application provides the offshore wind power generation equipment described in item 1 or 2 of the scope of patent application, wherein the outer peripheral part is connected in the circumferential direction by the outer peripheral side prefabricated box The outer peripheral surface of the PC steel is tightly knotted, and the aforementioned PC steel is arranged along the circumferential direction.

For the invention described in item 3 of the scope of the above-mentioned patent application, the aforementioned means for connecting the outer peripheral portion in the circumferential direction is arranged in the circumferential direction by prefabricating the outer peripheral surface of the box on the outer peripheral side for the purpose of simplifying the connecting operation. PC steel is tightly knotted.

The invention of item 4 of the scope of patent application provides the offshore wind power generation equipment described in any one of items 1 to 3 of the scope of patent application, wherein the aforementioned central part is made by penetrating the adjacent central prefabricated box The through bolts of each side wall of the body or the coupling structure of the side wall are connected in the circumferential direction.

The invention described in item 4 of the scope of the above-mentioned application is an example of a means for connecting the central part in the circumferential direction.

With regard to the present invention of item 5 of the scope of patent application, the offshore wind power generation equipment described in any one of items 1 to 4 of the scope of patent application is provided, wherein the aforementioned center side prediction The side walls of the box body and the side walls of the prefabricated box body on the outer peripheral side are individually provided with trenches for power cable wiring.

For the invention described in item 5 of the scope of the above-mentioned patent application, the power cable wiring trenches are separately provided on the side walls of the center side prefabricated box and the outer peripheral side prefabricated box, so that the power cable can be routed along the trench to make the power cable The introduction is easy.

Regarding the sixth invention of the scope of the patent application, the offshore wind power generation equipment described in any one of the scope of the patent application 1 to 5 is provided, wherein the bottom surface of the aforementioned basic structure is concave and convex.

According to the invention described in item 6 of the scope of the above-mentioned patent application, by forming unevenness on the bottom surface of the basic structure, even if the submarine flat hill is not built, a certain degree of unevenness can be adjusted to the absorption level.

With regard to the present invention of item 7 of the scope of patent application, the offshore wind power generation equipment described in any one of items 1 to 6 of the scope of patent application is provided, in which each outer peripheral side prefabricated box constituting the aforementioned outer peripheral portion is It is divided into a plurality of pieces in the radial direction, and the adjacent prefabricated box body on the inner side of the radius direction and the prefabricated box system on the outer side of the radius direction are connected to each other.

The invention described in item 7 of the above-mentioned scope of patent application relates to each outer peripheral side prefabricated box constituting the outer peripheral portion, which is divided into plural in the radial direction. When the size of the basic structure becomes larger, the outer periphery is divided in the radial direction to prevent the size of any prefabricated box from being too large. In addition, the adjacent prefabricated boxes on the inner side in the radial direction and the prefabricated box systems on the outer side in the radial direction are connected to each other.

Regarding the present invention in item 8 of the scope of patent application, the scope of patent application is provided The construction method of offshore wind power equipment described in any one of items 1 to 7; and it is made up of the following steps. The first step is that in the sea area near the quay wall, the seabed is implanted with The center-side prefabricated boxes are arranged in plural in the circumferential direction, and after the central part is combined by connecting in the circumferential direction, the outer periphery of the outer-peripheral prefabricated boxes are arranged in plural in the circumferential direction, and the outer periphery is combined by connecting in the circumferential direction After completing the assembly of the aforementioned basic structure, erect the aforementioned tower on the aforementioned foundation structure, and combine the aforementioned offshore wind power generation equipment with the equipment nacelle and plural wind turbine fins on the top of the aforementioned tower; the second step is to make the aforementioned Offshore wind power generation equipment is towed while floating; in the third step, ballast is thrown into the aforementioned central part, and buoyancy is generated at the aforementioned outer circumference under the condition that no ballast is thrown into the aforementioned outer circumference or the amount of ballast is reduced. In the state, the aforementioned basic structure is implanted on the seabed.

The invention described in item 8 of the above-mentioned patent application is in the sea area near the quay wall, in a state of being implanted on the seabed. After the basic structure is formed, the offshore wind power with tower, nacelle and windmill fins is built on it. Power Equipment. Therefore, since the offshore wind power generation equipment is completed in the sea area with stable waves near the land or the quay wall, the assembly operation of special ships on the sea is not required, and the purpose of improving workability and reducing operating costs can be achieved.

In addition, when the implanted foundation is sunk on the seafloor, the buoyancy of the outer periphery allows the foundation structure itself to maintain a level of static stability.

In addition, during the large-scale repair of offshore wind power equipment, the opposite process can be used, that is, by removing the ballast from the sinking infrastructure to float the offshore wind power equipment, and then tow it To the vicinity of the quay wall, and in this sea area through the process of repair.

With the present invention as described in detail above, it is not necessary to carry out the operation of using a special ship at sea, so as to improve the workability and reduce the operation cost, and reduce the manufacturing cost. In addition, the stability of the foundation structure when sinking to the seabed or floating. Excellent safety.

1: Offshore wind power equipment

2: Basic structure

3: Tower

4: cabin

5: Windmill fins

6: Deck

7: Center

8: Peripheral

9: Center side prefabricated box

10: Prefabricated box on the outer peripheral side

11: Opening for tower erection

12: PC steel

13: fixed parts

14: Ditch for power cable wiring

[Figure 1] The front view of the offshore wind power generation equipment 1 of the present invention.

[Figure 2] Side view of offshore wind power generation equipment 1.

[Figure 3] The plan view of the basic structure 2.

[Figure 4] Side view of the basic structure 2.

[Figure 5] Oblique view of the basic structure 2.

[Fig. 6] shows the center-side prefabricated box 9, (A) is a plan view, (B) is a B-B line sagittal view, and (C) is an oblique view.

Fig. 7 shows the outer peripheral side prefabricated box body 10, (A) is a plan view, (B) is a B-B line sagittal view, and (C) is an oblique view.

[Figure 8] An oblique view of the central side prefabricated box body 9 and the outer peripheral side prefabricated box body 10.

[Fig. 9] A sectional view of the foundation structure showing another example (Part 1) of the circumferential joining surface of the central part 7 and the outer peripheral part 8.

[Fig. 10] A cross-sectional view of the foundation structure showing another example (No. 2) of the circumferential joining surface of the central part 7 and the outer peripheral part 8.

[Fig. 11] A perspective view of each outer peripheral side prefabricated box 10 divided into two in the radial direction.

[Fig. 12] A side view showing the direction of buoyancy acting on the central side prefabricated box 9 and the outer peripheral side prefabricated box 10 when the basic structure 2 is sunk on the seabed.

[Fig. 13] An action diagram explaining the tilt correction due to buoyancy when the foundation structure 2 is near the water surface.

[Fig. 14] A perspective view showing the assembly process (Part 1) of the basic structure 2.

[Fig. 15] A perspective view showing the assembly process of the basic structure 2 (Part 2).

[Fig. 16] A perspective view showing the assembly process (part 3) of the basic structure 2.

[Fig. 17] A perspective view showing the assembly process (part 4) of the basic structure 2.

[Fig. 18] A perspective view showing the assembly process (part 5) of the basic structure 2.

[Figure 19] (A)~(C) are side views showing the construction process of offshore wind power generation equipment 1.

[Figure 20] A side view when the basic structure 2 is used as the foundation of wave power generation equipment.

[Figure 21] The side view when using the basic structure 2 as the foundation of the tidal current power generation equipment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in Figures 1 and 2, the offshore wind power generation equipment 1 consists of a foundation structure 2 installed on the seabed in an implanted state, a tower 3 erected on the foundation structure 2, and the top of the tower 3 The nacelle 4 of the equipment and the plural windmill fins 5, 5... In addition, before The middle part of the height direction of the tower 3 is provided with a deck 6. 1 and 2 show the cross-section of the foundation structure 2.

The aforementioned basic structure 2, as shown in Figs. 3 to 5, is formed in a circular shape in plan view with the aforementioned tower 3 as the center, and is composed of a central part 7 arranged on the center side in the radial direction and arranged on the outer periphery The outer periphery is composed of 8. The aforementioned central portion 7 is composed of a plurality of central side prefabricated boxes 9, 9... made of concrete divided into a plurality of outer shapes in the circumferential direction, and is composed of the aforementioned central side prefabricated boxes 9, 9... Connected and integrated in the circumferential direction. In addition, the outer peripheral portion 8 is composed of a plurality of outer peripheral side prefabricated boxes 10, 10... made of concrete divided into a plurality of outer shapes in the circumferential direction, and is composed of the aforementioned outer peripheral side prefabricated boxes 10, 10 …Connected and integrated in the circumferential direction.

The aforementioned central portion 7 and the outer peripheral portion 8 are joined to contact surfaces in the circumferential direction (the outer peripheral surface of the central portion 7 and the inner peripheral surface of the outer peripheral portion 8).

Hereinafter, it will be described in more detail.

The aforementioned basic structure 2, as shown in FIGS. 3 to 5, is provided with an opening 11 for erecting a tower in a vertical direction in order to allow the tower 3 to be erected in the center, and is formed as an opening 11 for erecting the tower As the center, it has a circular shape when viewed from above. By having a predetermined height, the overall appearance is disc-shaped. By forming the aforementioned basic structure 2 into a circular plane, the design cost can be reduced due to a simple shape, and by expanding the installation area of the basic structure 2, the resistance to overturning is equalized, thereby ensuring offshore The overturning stability of wind power generation equipment 1.

The central portion 7 has the opening 11 for erecting the tower at the center, and the circumferential contact surface (outer peripheral surface) of the outer peripheral portion 8 is an inclined surface that is inclined downward and inclined outward in the radial direction. The appearance of a slightly reversed truncated truncated cone (refer to Figure 1 5).

The center portion 7 is formed by plurally arraying the center-side prefabricated boxes 9 in the circumferential direction, and the isocenter-side prefabricated boxes 9, 9... are connected and integrated in the circumferential direction. The center-side prefabricated box 9 has a radial direction line along a certain center angle, and the center portion 7 is divided into a plurality of outer shapes in the circumferential direction, and is formed in a slightly fan-shaped plan view. The aforementioned center-side prefabricated box 9 can divide the central part 7 into 2 to 16 equal parts, preferably 4 to 8 equal parts, and in the example shown in the figure, it is better to form an 8 equal part. In addition, since the center-side prefabricated box 9 is a concrete prefabricated member, the manufacturing cost can be easily reduced by mass production. In order to reduce the manufacturing cost, it is preferable to form all the aforementioned center-side prefabricated boxes 9 into the same shape.

The aforementioned center-side prefabricated box 9, as shown in Figure 6, is surrounded by a bottom plate 9a, an inner peripheral wall 9b, an outer peripheral wall 9c, side walls 9d, 9d, and a cover 9e. The hollow box body can ensure the water impermeability of the hollow part. . The aforementioned cover 9e can be a structure in which the hollow part can be sealed by being integrally formed with the main body part, or it can be detachable from the main body part and covered in a watertight state during the assembly process. The aforementioned center-side prefabricated box body 9 floats alone in the state where the hollow part is enclosed with air, and can be transported on the sea more than the manufacturing factory makes it float and tow.

The center part 7 is integrated by connecting a plurality of the center side prefabricated boxes 9, 9... in the circumferential direction. This connection method is preferably connected by a plurality of through bolts that penetrate through the side walls 9d, 9d of the adjacent central side prefabricated boxes 9, 9; the outer peripheral wall 9c is provided with a box part, and the box Bolts connect the adjacent side walls 9d and 9d to each other to connect; or between the side walls 9d and 9d of the adjacent central side prefabricated boxes 9 and 9 The outer surface is individually provided with a coupling structure and connected by connecting the coupling structure; or the side surfaces are connected to each other with an adhesive to connect. For the aforementioned coupling structure, it is better to use a one-touch coupling that is generally used as a coupling structure for tunnel sections. Take a specific example, it is better to have the one disclosed in the Japanese Patent Publication No. 2011-99312. The coupling structure disclosed in this publication consists of: the side wall 9d of the center side prefabricated box 9 on the side of the joint is embedded and the end surface is exposed, and the end surface is formed with a female threaded hole, one of the side anchor bars, and the joint The side wall 9d of the center-side prefabricated box 9 on the other side is exposed and buried, and the other side anchor bar with a fitting hole formed on the end surface, and a truncated cone inserted into the fitting hole of the other side anchor bar It is formed by a single-piece element with a shape and a joint element with a male threaded part on one end side and a cylindrical part formed by a plurality of slits along the axial direction in the circumferential direction on the other end side. The male threaded part of the aforementioned joining element is screwed and engaged with the female threaded hole of the aforementioned anchor steel bar, and the cylindrical part of the aforementioned joining element is inserted into the fitting hole of the aforementioned anchor steel bar, and pressed by the single-piece element Expansion becomes inextricable and fixed.

The cover 9e of the aforementioned center-side prefabricated box 9 is provided with a water supply and drainage port 9f communicating with the inner hollow. Through this water supply and drainage port 9f, ballast can be injected into and discharged from the inside. The aforementioned water supply and drainage port 9f is closed by a plug not shown in the figure, so that the water-impermeability of the hollow portion can be ensured. For the aforementioned ballast, in addition to seawater or fresh water, sand, gravel, gravel, minerals, metal powder particles, etc. can also be used. The input of such ballast materials. The discharge method is preferably the method described in JP 2012-201217 A (fluid transfer).

On the other hand, the outer peripheral portion 8 is arranged on the outer periphery of the central portion 7 and has a doughnut-like appearance as a whole. The outer peripheral portion 8 is arranged in plural in the circumferential direction by the outer peripheral side prefabricated boxes 10, 10..., and these outer peripheral side prefabricated boxes 10, 1 0...The structure is connected and integrated in the circumferential direction.

The outer peripheral side prefabricated box body 10 is formed by dividing the outer peripheral portion 8 having a certain central angle and being formed in a donut shape along the radial direction into plural numbers in the circumferential direction. The aforementioned outer peripheral side prefabricated box body 10 is divided into 4 equal parts to 32 equal parts, preferably 4 equal parts to 8 equal parts, and the figure example is preferably formed into an 8 equal part shape. In the example of the drawing, although the number of divisions of the central part 7 and the outer peripheral part 8 are both equal to 8, the number of divisions may be different. In different situations, the number of divisions of the central portion 7 than the outer peripheral portion 8 is better. In addition, since the outer peripheral side prefabricated box body 10 is a prefabricated element made of concrete, the manufacturing cost can be easily reduced by mass production. In order to reduce the manufacturing cost of the aforementioned outer prefabricated box body 10, it is preferable that all of them have the same shape.

The aforementioned outer peripheral side prefabricated box body 10 is shown in FIG. 7. The hollow box is surrounded by the bottom plate 10a, the inner peripheral wall 10b, the outer peripheral wall 10c, the side walls 10d, 10d and the cover 10e, which can ensure the water impermeability of the hollow part. The aforementioned cover 10e can be formed integrally with the main body to keep the hollow part sealed from the beginning, or it can be detachable from the main body and covered in a watertight state during the assembly process. The aforementioned outer prefabricated box body 10 floats alone with air enclosed in the hollow part, and after it is floated from the manufacturing plant, it is towed to increase the sea transportability.

The cover 10e of the outer peripheral side prefabricated box 10 is provided with a water supply and drain port 10f that communicates with the inner hollow. Through this water supply and drainage port 10f, ballast can be injected into and discharged from the inside. The aforementioned water supply and drainage port 10f is closed by a plug not shown in the figure, so that the water-impermeability of the hollow portion can be ensured.

The aforementioned outer peripheral part 8, as shown in Figures 4 and 5, is prefabricated by the aforementioned outer peripheral side A plurality of PC steel materials 12, 12... are arranged along the circumferential direction and tightly connected to the outer peripheral wall 10c of the boxes 10, 10..., and are connected in the circumferential direction. Although it is preferable to arrange the aforementioned PC steel materials 12, 12... on the outer surface of the outer peripheral wall 10c in the outer cable method, an inner cable method arranged inside the outer peripheral wall 10c may be used.

The aforementioned outer cable method, as shown in FIG. 4, on the outer circumferential center portion of the outer peripheral wall 10c of each outer peripheral side prefabricated box 10, the fixing member 13 is fixed in the vertical direction, and the fixing member 13 is fixed in the vertical direction A plurality of through holes for inserting the aforementioned PC steel material 12 in the circumferential direction are provided at intervals. One of the fixing parts 13 of the outer peripheral side prefabricated box 10, at least two of the fixing parts 13, 13 adjacent to the outer peripheral side prefabricated boxes 10, 10 form a group, if it crosses the fixing parts 13, 13... Generally, PC steel material 12 is installed, and the two ends of the PC steel material are tightened with a nut to realize the integration of the PC steel material 12 by introducing tension.

The arrangement of the aforementioned PC steel material 12, as shown in Figure 4, is opposite in the vertical direction. By displacing a set of outer peripheral side prefabricated boxes 10, 10... one by one, the tension of the PC steel material 12, 12... It acts on all the outer peripheral side prefabricated boxes 10, 10..., and is preferably set so that even if one PC steel material 12 is damaged and the tightening force becomes weak, the tightening force can be maintained by other PC steel materials 12, 12....

In addition, the aforementioned inner cable method is to embed a nut for inserting the PC steel material 12 in the circumferential direction inside the outer peripheral wall 10c. The nuts communicate with each other so that the outer peripheral side prefabricated boxes 10, 10 When side by side in the circumferential direction, the PC steel 12 can be inserted into the nuts connected to the adjacent outer peripheral side prefabricated boxes 10, 10, and the two ends of the nuts can be tightened, so that the tension can be introduced into the PC steel 12. Integrator.

The outer peripheral portion 8 may be tightly knotted by the PC steel 12, or may be Replace with the following means: the same as the method of connecting the central part 7 described above, the side walls 10d, 10d of the adjacent outer peripheral side prefabricated boxes 10 are connected by bolts through each other; and the adjacent parts inside the box are connected by bolts. The side walls 10d and 10d are connected; connected by the coupling structure of the side surface; connected by the adhesive to each side surface.

Each outer peripheral side prefabricated box 10 of the aforementioned outer peripheral portion 8 may be divided into a plurality of pieces in the radial direction. Specifically, as shown in FIG. 11, each outer peripheral side prefabricated box 10 can be divided into an inner prefabricated box 10A and an outer prefabricated box 10B in the radial direction, for example. At this time, the adjacent prefabricated box 10A on the inner side in the radial direction and the prefabricated box 10B on the outer side in the radial direction are connected to each other by through bolts that penetrate the contact wall surfaces in the circumferential direction.

The aforementioned central portion 7 and the outer peripheral portion 8 are joined and integrated in a contact surface in the circumferential direction. Specifically, the outer peripheral wall 9c of the center-side prefabricated box 9 and the inner peripheral wall 10b of the outer-peripheral prefabricated box 10 are connected to each other by a plurality of through bolts that penetrate the outer peripheral wall 9c and the inner peripheral wall 10b.

The shape of the circumferential contact surface (opposing surface) of the aforementioned central portion 7 and the outer peripheral portion 8 is not particularly limited, but in this embodiment, the lower side is inclined radially inwardly from the upper side. That is, as shown in Figures 6 to 8, the outer surface of the outer peripheral wall 9c of the center-side prefabricated box 9 (the surface in contact with the outer peripheral portion 8) and the outer surface of the inner peripheral wall 10b of the outer-peripheral prefabricated box 10 (with the center portion 7 contact surface), the lower side is located on the inner side in the radial direction and is inclined more than the upper side. The circumferential contact surface of the aforementioned central portion 7 and the circumferential contact surface of the outer peripheral portion 8 are preferably inclined in the same shape (angle). In addition, the shape of the circumferential contact surface between the central portion 7 and the outer peripheral portion 8 may be a vertical surface as shown in FIG. 9, or may be formed such that the lower side is inclined outward in the radial direction from the upper side as shown in FIG. 10. Furthermore, the aforementioned inclination of the contact surface in the circumferential direction can be It is formed in a linear shape as shown in the example, but it may be formed in an arc shape bulging to the outside or inside in the radial direction.

In the aforementioned basic structure 2, by throwing ballast into the central portion 7 and the outer peripheral portion 8 is not thrown into ballast or the amount of ballast is reduced, the outer peripheral portion 8 is in a state where buoyancy is generated. Here, "generating buoyancy" refers to the state of floating on the water surface with buoyancy greater than its own weight under unconstrained conditions.

Therefore, when the implanted foundation is sunk on the seabed or floated, as shown in Fig. 12, the foundation structure itself has a level of static stability due to the buoyancy of the outer peripheral portion 8. In other words, the positive force (buoyant force) around the center portion 7 is directed upwards, so that the static stability of the entire foundation is excellent. In addition, especially near the water surface, as shown in Figure 13(A), when the aforementioned foundation structure 2 is inclined, the buoyancy on the sinking side increases. Due to the phenomenon of buoyancy on the floating side, the foundation structure 2 is automatically tilted. Maintain the level of force (resilience), thereby having dynamic stability.

When the foundation structure 2 is implanted on the seafloor, only the ballast is thrown into the center portion 7 and the ballast should not be thrown into the outer peripheral portion 8 in order to generate a large buoyancy.

In addition, after the foundation structure 2 is implanted, the outer peripheral portion 8 can be maintained in a buoyant state at ordinary times. In order to increase sliding resistance, ballast may be thrown into the outer peripheral portion 8 after implantation to be filled with water.

The aforementioned central side prefabricated box body 9 and outer peripheral side prefabricated box body 10, as shown in FIG. 3, are separately formed so that the outer shape obtained by dividing the same radial direction line extending to the central portion 7 and the outer peripheral portion 8 in the circumferential direction is preferable . Thereby, as shown in FIG. 8(B), the side wall 9d of the central side prefabricated box 9 and the side wall 10d of the outer peripheral side prefabricated box 10 can be formed in substantially the same plane Inside. At this time, the outer side of one center-side prefabricated box 9 is in a state where one outer peripheral side prefabricated box 10 is arranged, and the whole is formed in a slightly fan shape in plan view.

As shown in Fig. 8(B), the side wall 9d of the center-side prefabricated box 9 and the side wall 10d of the outer-peripheral side prefabricated box 10 are respectively provided with continuous power cable wiring grooves 14 on the center and outer peripheral sides in the radial direction. Better. By wiring the power cable in the cable wiring trench 14, the power cable can be easily introduced, thereby reducing the underwater construction required by the diver, and improving the workability.

In addition, the bottom surface of the aforementioned basic structure 2 may be flat, or it may be formed into an uneven shape by providing a large number of protrusions. Since the bottom surface is concave and convex, it is easy to obtain a level adjustment that can absorb the unevenness of the seabed to a certain extent even if the seabed flat hill is not built, and most of the protrusions are engaged with the unevenness of the seabed, which can improve the grounding of the basic structure 2 in the horizontal direction. resistance.

〔Construction method〕

Hereinafter, the construction method of the aforementioned offshore wind power generation equipment 1 will be described in detail based on Figs. 14-19.

(Step 1)

In the sea area near the quay wall, the offshore wind power generation equipment 1 is assembled in the state of being implanted on the seabed. Assembling the offshore wind power generation equipment 1, first, as shown in Figures 14 and 15, the central side prefabricated boxes 9, 9... are arranged in the circumferential direction, and the central side prefabricated boxes 9, 9... After connecting the central part 7 in the circumferential direction, as shown in Figures 16 and 17, the outer peripheral side prefabricated boxes 10, 10... are arranged in the circumferential direction on the outer periphery of the central part 7, and the outer peripheral side prefabricated boxes 10, 10... are connected in the circumferential direction to combine the outer peripheral portion 8. Next, as shown in Figure 18, the central side prefabricated box 9 and the outer peripheral side prefabricated box 10 are individually tied to one side The caps 9e and 10e are fixed to ensure the watertightness, and the assembly of the basic structure 2 is completed. In order to ensure stability, the assembly of offshore wind power generation equipment 1 is carried out under the condition that the basic structure 2 is implanted to the seabed, but at this time, the boxes 9..., 10... are inserted in advance so that they can be implanted on the seabed. Ballast (water) at the level of the seabed.

Next, as shown in FIG. 19(A), a tower 3 is erected on the above-mentioned basic structure 2, and the nacelle 4 and the plural windmill fins 5, 5... are installed on the top of the tower 3, so that the offshore wind power generation equipment 1 The assembly is complete.

In the assembly of the aforementioned offshore wind power generation equipment 1, cranes installed on land or FC ships on the sea can be used.

(Step 2)

During construction, the ballast (water) put into each box 9..., 10... is discharged, as shown in Figure 19(B), while the offshore wind power generation equipment 1 is floating, it is towed by the tug 15 Sail to the setting place on the sea.

(Step 3)

As shown in FIG. 19(C), ballast is thrown into at least the aforementioned central portion 7, and the foundation structure 2 is implanted on the seabed to complete the construction. At this time, by adjusting the amount of the aforementioned ballast, the ground pressure can be adjusted according to the seabed geology. In addition, when predicting the unequal level of the seafloor, it can respond to the situation by reducing the ballast and increasing the thickness of the bottom concrete.

As mentioned above, this offshore wind power generation equipment 1 uses cranes in the waters near the quay wall to complete the assembly of the offshore wind power generation equipment 1. After the offshore wind power generation equipment 1 is towed to the sea, the ballast is put into the foundation Since the structure 2 is implanted, there is no need to assemble a special work vessel for use at sea, which can improve workability and reduce work costs. In addition, Even if the offshore wind power generation equipment 1 is installed on the seabed in an implanted state, when it floats again by discharging the dropped ballast, no residue is left in the sea area, so it is easy to move.

〔Method of repair〕

On the other hand, large-scale repairs can be carried out by a method opposite to the above-mentioned construction method at the time of construction.

(Step 1)

As shown in FIG. 19(C), the offshore wind power generation equipment 1 is floated by discharging the ballast of the center portion 8 described above.

(Step 2)

As shown in FIG. 19(B), in the state where the offshore wind power generation equipment 1 is floating, it is towed by the tug boat 15 to the sea area near the quay wall.

(Step 3)

As shown in Fig. 19(A), the ballast that can make the basic structure 2 implanted on the seafloor is put in, so that the basic structure 2 can be repaired in the state of the seafloor implanted.

[Other types of examples]

(1) Although the above-mentioned type example describes the use of the aforementioned basic structure 2 as the foundation of offshore wind power generation equipment, the aforementioned basic structure 2 can also be applied to other offshore power generation equipment. Specifically, as shown in Fig. 20, it can be used as the basic structure of wave power generation equipment, and as shown in Fig. 21, it can also be used as the basic structure of tidal and ocean current power generation equipment. In addition, it can also be used as the basic structure of a hybrid power generation device that combines the aforementioned wind power generation equipment with these wave power generation equipment, tidal power and ocean current power generation equipment.

1: Offshore wind power equipment

2: Basic structure

3: Tower

4: cabin

5: Windmill fins

6: Deck

7: Center

8: Peripheral

9: Center side prefabricated box

10: Prefabricated box on the outer peripheral side

Claims (7)

An offshore wind power generation equipment, characterized in that it is composed of a foundation structure installed on the seabed in an implanted state, a tower erected on the foundation structure, and a nacelle and plural windmills equipped on the top of the tower An offshore wind power generation facility made of fins; and the aforementioned basic structure is formed to have a circular shape in plan view with the aforementioned tower as the center, and it is composed of a central part arranged on the center side in the radial direction and arranged on the outer periphery The outer peripheral part is composed; the aforementioned central part is composed of a plurality of concrete center-side prefabricated boxes divided into a plurality of outer shapes in the circumferential direction, and is connected in the circumferential direction by the aforementioned center-side prefabricated boxes The aforementioned outer peripheral part is formed by a plurality of outer peripheral side prefabricated boxes made of concrete divided into a plurality of outer shapes in the circumferential direction, and is formed by connecting the aforementioned outer peripheral side prefabricated boxes in the circumferential direction; The central part and the outer peripheral part are joined by the contact surface in the circumferential direction; the aforementioned basic structure is to put ballast in the aforementioned central part, and the aforementioned outer peripheral part is not put into ballast or the amount of ballast put into it is reduced, resulting in the aforementioned outer peripheral part Implant on the seabed in a buoyant state. The offshore wind power generation equipment described in the first item of the scope of patent application, wherein the outer peripheral part is connected in the circumferential direction, and the outer peripheral surface of the outer peripheral side prefabricated box body is tightly bonded with PC steel, and the PC steel is along Circumferential arrangement. The offshore wind power generation equipment described in the first item of the scope of patent application, wherein the center part is provided by through bolts penetrating each side wall of the adjacent center side prefabricated box or a coupling structure provided in the side wall, and Connect in the circumferential direction. Such as the offshore wind power generation equipment described in item 1 of the scope of patent application, wherein the aforementioned center side The side walls of the prefabricated box body and the side walls of the outer peripheral side prefabricated box body are individually provided with trenches for power cable wiring. Such as the offshore wind power generation equipment described in the first item of the scope of patent application, wherein the bottom surface of the aforementioned basic structure is formed in an uneven shape. The offshore wind power generation equipment described in the first item of the scope of patent application, wherein each of the outer peripheral side prefabricated boxes constituting the aforementioned outer peripheral part is divided into plural in the radial direction, and the adjacent radial inner prefabricated boxes Interconnect with the prefabricated box system on the outside in the radial direction. A construction method of offshore wind power equipment, which is characterized in that it is the construction method of offshore wind power equipment as described in any one of items 1 to 6 of the scope of the patent application; and it is made up of the following steps: In the first step, in the sea area near the bank wall, the center-side prefabricated boxes are arranged in plural in the circumferential direction in a state of implantation on the seabed, and the central parts are combined by connecting them in the circumferential direction, and then the outer periphery The side prefabricated boxes are arranged in plural in the circumferential direction, and the outer peripheral parts are combined by connecting in the circumferential direction. After the assembly of the basic structure is completed, the tower is erected on the basic structure, and the equipment nacelle and Plural windmill fins are combined with the aforementioned offshore wind power generation equipment; the second step is to tow the aforementioned offshore wind power generation equipment in a floating state; and the third step is to throw ballast into the aforementioned central part, and the aforementioned outer peripheral part Under the condition of dropping ballast or reducing the amount of ballast, the foundation structure is implanted on the seabed in a state where buoyancy is generated at the outer peripheral portion.

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