TW201727053A - Offshore wind power generation facility and construction method therefor - Google Patents

Abstract

To eliminate the need for work using a special marine vessel at sea, improve workability, reduce work costs, and reduce manufacturing costs. A foundation structure 2 is formed centered around a tower 3 in a circular shape when viewed in a plane, and is configured from a central portion 7 in the center in the radial direction, and a peripheral portion 8 arranged on the outer periphery of the central portion. The central portion 7 comprises multiple center-side precast concrete boxes 9 having an external shape that is formed by dividing the central portion into multiple pieces in the circumferential direction, and the central portion is formed by linking the center-side precast boxes 9 in the circumferential direction. The peripheral portion 8 comprises multiple peripheral precast concrete boxes 10 having an external shape that is formed by dividing the peripheral portion into multiple pieces in the circumferential direction, and the peripheral portion is formed by linking the peripheral precast boxes 10 in the circumferential direction. The central portion 7 and the peripheral portion 8 are joined at circumferential contact surfaces, and the foundation structure is implanted in the seafloor in a state in which ballast has been loaded into only the central portion, with buoyancy being generated in the peripheral portion 8.

Description

Offshore wind power generation equipment and construction method thereof

The invention relates to a bed type offshore wind power generation device and a construction method thereof.

Traditionally, although power generation methods such as hydropower, firepower, and nuclear power generation have been used, in recent years, wind power generation using natural winds has attracted attention from the viewpoint of effective use of environment and natural energy. This wind power generation facility has a land-based installation and a water (mainly offshore) installation. However, for Japan, which has mountainous terrain from the coastal area to the back, there will be few plains with stable winds in the coastal areas. situation. On the other hand, Japan is surrounded by the sea, and it is easy to obtain wind suitable for power generation at sea, and has the advantage of less restrictions on installation. Therefore, there have been many proposals for offshore wind power generation equipment in recent years.

The offshore wind power generation device can be placed on the bottom surface of the sea, such as a pipe rack foundation (Patent Document 1 below) or a diving tank base (Patent Document 2 below), depending on the manner in which the foundation structure is installed; A pontoon type (Patent Document 3 below); a Semi-Submersible type (hereinafter referred to as Patent Documents 4 and 5); a Spar type (hereinafter referred to as Patent Document 6) floating on the surface of the sea Or a floating body in the sea.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-4351

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2006-322400

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

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2007-160965

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

[Patent Document 6] Japanese Patent Laid-Open Publication No. 2009-18671

However, the above-mentioned construction of the offshore wind power generation equipment of the bed type will be used in the basic setting and the assembly of the windmill, such as a self-propelled work platform ship (SEP ship) or a large crane ship (FC ship). In the offshore work of the special ship for work, there is a limitation in the number of existing ships, or the work day is restricted due to weather changes, and the work rate is deteriorated, and the work cost is increased. In addition, when a blade or a generator is faulty or has problems, a special ship for offshore operations such as a SEP ship or a large FC ship must be used, so the same problem occurs.

On the other hand, in the above-described floating body type, a special ship such as a large FC ship is used for the purpose of securing the stability of the floating body and preventing it from falling over, etc., in the same manner as described above. There is a problem that the rate of operation has deteriorated and the operating cost is increased.

Further, the above-described slide type pipe frame type foundation or floating type semi-submersible type floating body or the like has a problem that mass production is difficult and manufacturing cost is high because a large number of steel materials are used.

Further, when the foundation of the bed type is placed on the sea floor, if it is particularly inclined to the state near the water edge, the foundation structure which appears on the water surface in a large amount will be subjected to great gravity inertia, and there is a large amount of upward air. After the water, in the worst case, the problem of the possibility of damage to the basic structure.

The main subject of the present invention is to provide an offshore wind power generation facility and a construction method thereof, which do not require the use of a special ship at sea, and improve workability and operation cost, while reducing manufacturing costs, and The stability of the foundation structure when it is placed on the seabed and floated up is excellent.

In order to solve the above problems, the present invention of claim 1 relates to an offshore wind power generation apparatus characterized in that it is provided by a foundation structure which is placed on the seabed in an implantation state, and on the foundation structure. An erected tower, and an offshore wind power generation device formed by a nacelle of the top of the tower and a plurality of windmill blades; and the basic structure is formed such that the tower is centered and has a circular shape in plan view. Further, the center portion is disposed at a center portion on the center side in the radial direction and at a peripheral portion disposed outside the outer circumference; the center portion is formed by a center side of a plurality of concretes having a plurality of outer shapes divided in the circumferential direction The prefabricated box is formed by the above-mentioned center side prefabricated box being connected in the circumferential direction; and the outer peripheral portion is made of a plurality of concrete outer peripheral side prefabricated cases which are divided into a plurality of outer shapes in the circumferential direction thereof. Made of the aforementioned peripheral side prefabricated box in the circumference The direction is connected, and the center portion and the outer peripheral portion are joined to each other in the circumferential direction contact surface.

According to the invention of the first aspect of the invention, the basic structure of the offshore wind power generation apparatus is formed such that the tower is centered and has a circular shape in plan view, and is disposed at a center portion on the radial center side. And arranged on the outer circumference of the outer circumference. Further, the center portion is formed of a center-side prefabricated box made of a plurality of concretes which are divided into a plurality of outer shapes in the circumferential direction, and is formed by connecting the center side prefabricated cases in the circumferential direction. In addition, the outer peripheral portion is formed of a plurality of outer peripheral side prefabricated cases made of a plurality of concretes which are divided into a plurality of outer shapes in the circumferential direction, and is formed by connecting the outer peripheral side prefabricated cases in the circumferential direction.

Therefore, by the construction steps described later, the assembly of the offshore wind power generation equipment can be completed in the waters near the bank wall, and the offshore wind power generation equipment is towed to the sea, and the ballast is put into the bed to make the foundation structure into an implantation state. It is necessary to assemble an offshore wind power plant using a special ship at sea, 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 the mass production can be easily reduced.

Further, the center portion and the outer peripheral portion are joined to each other in the circumferential direction contact surface, and the center portion and the outer peripheral portion are integrally formed.

The invention according to claim 2 is the offshore wind power generation apparatus according to claim 1, wherein the basic structure is that a ballast is introduced into the center portion, and the outer peripheral portion is not input. The ballast or the amount of ballast is reduced, and the outer peripheral portion is buoyed to form a bed on the seabed.

The invention described in the second aspect of the above patent application, the aforementioned basic structure A structure in which a ballast is introduced into the center portion, and the ballast is not supplied to the outer peripheral portion, and the amount of the ballast is reduced, and the buoyancy is generated in the outer peripheral portion, and the structure is placed on the seabed.

Therefore, when the foundation of the bed type is placed on the sea floor or floated up, the base structure itself can be kept horizontal by the buoyancy of the outer peripheral portion, and is statically stabilized, and particularly in the vicinity of the water surface, when the foundation structure is inclined. The buoyancy increases relative to the sinking side, and due to the buoyancy phenomenon on the floating side, the base structure automatically maintains a horizontal force (restoring force) when the tilt is applied, thereby having dynamic stability.

The invention according to claim 3, wherein the outer peripheral portion is connected in the circumferential direction by the outer peripheral side prefabricated casing. The outer peripheral surface is tightly bonded with PC steel, and the PC steel material is disposed along the circumferential direction.

In the invention according to the third aspect of the invention, the means for connecting the outer peripheral portion in the circumferential direction is arranged in the circumferential direction by the outer peripheral surface of the prefabricated casing on the outer peripheral side for the purpose of simplifying the connecting operation and the like. PC steel is tight.

The invention of claim 4 is the offshore wind power generation apparatus according to any one of claims 1 to 3, wherein the center portion passes through the adjacent center side prefabricated box The through-bolts or the side walls of the side walls of the body are connected to each other and connected in the circumferential direction.

The invention described in the fourth aspect of the invention is exemplified as a means for connecting the center portion in the circumferential direction.

The present invention provides an offshore wind power generation apparatus according to any one of claims 1 to 4, wherein the center side prefabrication is provided. The side wall of the casing and the side wall of the prefabricated casing on the outer peripheral side are provided with power cable wiring grooves.

According to the invention of the fifth aspect of the invention, the power cable wiring groove is separately provided on the side wall of the center side prefabricated case and the outer peripheral side prefabricated case, so that the power cable can be routed along the groove to make the power cable The introduction is easy.

The present invention provides an offshore wind power generation facility according to any one of the first to fifth aspects of the present invention, wherein the bottom surface of the base structure is formed with irregularities.

According to the invention of the sixth aspect of the invention, the unevenness is formed on the bottom surface of the foundation structure, and even if the seafloor flat is not constructed, a certain degree of unevenness can be adjusted to the absorption level.

The present invention provides an offshore wind power generation facility according to any one of claims 1 to 6, wherein each of the outer peripheral side prefabricated casings constituting the outer peripheral portion is provided. The plurality of prefabricated boxes on the inner side in the radial direction and the prefabricated box on the outer side in the radial direction are connected to each other in the radial direction.

According to the invention of the seventh aspect of the invention, the outer peripheral side prefabricated casing constituting the outer peripheral portion is divided into plural in the radial direction. When the size of the foundation structure is increased, the structure in which the outer peripheral portion is divided in the radial direction can prevent the size of any of the prefabricated cases from being excessively large. Further, the prefabricated casings on the inner side in the radial direction and the prefabricated casings on the outer side in the radial direction are connected to each other.

The invention of claim 8 is the construction method of the offshore wind power generation apparatus as described in any one of claims 1 to 7; In the first step, in the sea area near the bank, the center side prefabricated casing is arranged in the circumferential direction in the seabed state, and the center portion is connected in the circumferential direction to combine the center portions. The outer peripheral side prefabricated casing is arranged in a plurality of rows in the circumferential direction, and the outer peripheral portion is combined by joining in the circumferential direction, and after the assembly of the basic structure is completed, the tower is erected on the base structure, and the tower is a top equipment nacelle and a plurality of windmill fins, combining the aforementioned offshore wind power generation equipment; a second step of causing the offshore wind power generation equipment to float in a floating state; and a third step, introducing a ballast to the central portion, The base structure is placed on the seabed in a state where buoyancy is generated in the outer peripheral portion without the ballast or the amount of ballast being reduced in the outer peripheral portion.

The invention described in claim 8 of the above-mentioned patent application is in the sea area near the bank wall, and in the state of being placed on the seabed, after the basic structure is formed, the offshore wind power of the tower, the nacelle and the windmill blade is constructed thereon. Power Equipment. Therefore, since the offshore wind power generation equipment is completed in the sea where the wave is stabilized near the land or the bank wall, the assembly work of the special ship at sea is not required, and the workability and the operation cost can be improved.

Further, when the foundation of the bed type is placed on the sea floor, the base structure itself has a static level of stability by the buoyancy of the outer peripheral portion.

Moreover, in the case of large-scale repair of offshore wind power generation equipment, the opposite process can be carried out by removing the ballast material from the foundation structure of the foundation and floating the offshore wind power generation equipment. It is near the shore wall and is carried out in this sea area through the process of repairing.

According to the present invention as described above, it is possible to improve the workability, reduce the work cost, and reduce the manufacturing cost without performing the work of using a special ship at sea. In addition, the foundation structure is placed on the sea floor, or the stability of the floating structure is excellent.

1‧‧‧ Offshore wind power equipment

2‧‧‧Basic structure

3‧‧‧ Tower

4‧‧‧Cabinet

5‧‧‧ windmill blades

6‧‧‧Deck

7‧‧‧ Central Department

8‧‧‧The outer part

9‧‧‧Center side prefabricated cabinet

10‧‧‧Prefabricated box on the outer circumference

11‧‧‧Tower opening

12‧‧‧PC steel

13‧‧‧Fixed parts

14‧‧‧Power cable wiring trench

Fig. 1 is a front elevational view of an offshore wind power plant 1 of the present invention.

2 is a side view of the offshore wind power generation facility 1.

FIG. 3 is a plan view of the foundation structure 2.

FIG. 4 is a side view of the foundation structure 2.

Fig. 5 is a perspective view of the foundation structure 2.

Fig. 6 shows a center side prefabricated casing 9, (A) is a plan view, (B) is a B-B line vector view, and (C) is a perspective view.

Fig. 7 shows an outer peripheral side prefabricated casing 10, wherein (A) is a plan view, (B) is a B-B line vector view, and (C) is a perspective view.

Fig. 8 is a perspective view of the center side prefabricated case 9 and the outer peripheral side prefabricated case 10.

FIG. 9 is a cross-sectional structural view showing another configuration example (No. 1) of the circumferential joint surface of the center portion 7 and the outer peripheral portion 8.

FIG. 10 is a cross-sectional structural view showing another configuration example (No. 2) of the circumferential joint surface of the center portion 7 and the outer peripheral portion 8.

Fig. 11 is a perspective view showing the outer peripheral side prefabricated casing 10 divided into two in the radial direction.

Fig. 12 is a side view showing the direction of buoyancy acting on the center side prefabricated casing 9 and the outer peripheral side prefabricated casing 10 when the foundation structure 2 is placed on the sea floor.

Fig. 13 is an operation diagram for explaining the tilting of the foundation structure 2 by buoyancy when it is in the vicinity of the water surface.

Fig. 14 is a perspective view showing the assembly process (1) of the foundation structure 2.

Fig. 15 is a perspective view showing the assembly process (2) of the foundation structure 2.

Fig. 16 is a perspective view showing the assembly process (3) of the foundation structure 2.

Fig. 17 is a perspective view showing the assembly process (the 4) of the foundation structure 2.

Fig. 18 is a perspective view showing the assembly process (the 5) of the foundation structure 2.

19(A) to (C) are side views showing the construction process of the offshore wind power generation facility 1.

Fig. 20 is a side view showing the basic structure 2 used as a basis for a wave power generation facility.

Fig. 21 is a side view showing the basic structure 2 used as a basis for the tidal current and ocean current power generation equipment.

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

As shown in FIG. 1 and FIG. 2, the offshore wind power generation facility 1 is a foundation structure 2 which is placed on the seabed in an implantation state, and a tower 3 which is set up on the foundation structure 2, and the top of the tower 3 The cabin 4 of the equipment and the plurality of windmill blades 5, 5... are formed. Further, a deck 6 is provided at an intermediate portion of the tower 3 in the height direction. 1 and 2 show the cross section of the foundation structure 2.

As shown in FIGS. 3 to 5, the basic structure 2 is formed in a circular shape in a plan view centering on the tower 3, and is disposed at a center portion on the center side in the radial direction. 7. The peripheral portion 8 is disposed outside the outer circumference. The center portion 7 is formed of a plurality of center-side prefabricated casings 9, 9, which are divided into a plurality of outer shapes in the circumferential direction thereof, and is formed by the center side prefabricated casings 9, 9, ... The circumferential direction is connected and integrated. Further, the outer peripheral portion 8 is formed of a plurality of outer peripheral side prefabricated cases 10, 10, which are divided into a plurality of outer shapes in the circumferential direction thereof, and are formed by the outer peripheral side prefabricated cases 10, 10 ...constructed in the circumferential direction.

The center portion 7 and the outer peripheral portion 8 are joined to each other in the circumferential direction contact surface (the outer peripheral surface of the center portion 7 and the inner peripheral surface of the outer peripheral portion 8).

Hereinafter, it will be described in more detail.

As shown in FIG. 3 to FIG. 5, the base structure 2 includes a tower vertical opening 11 in a vertical direction in order to erect the tower 3 at the center, and is formed as an opening 11 for the tower. The center is circular in shape when viewed from the center, and the overall appearance is a disk shape by having a predetermined height. By forming the base structure 2 into a circular flat surface, the design cost can be reduced due to the simple shape, and by increasing the installation area of the foundation structure 2, the resistance against the overturn can be equalized, thereby ensuring the offshore The stability of the wind power generation equipment 1 is reversed.

The center portion 7 is provided with the above-described tower standing opening 11 at the center, and the circumferential contact surface (outer peripheral surface) of the outer peripheral portion 8 is inclined as it is inclined downward toward the outer side in the radial direction. It is the appearance of the slightly inverted truncated cone (refer to Figure 15).

In the center portion 7, the center-side prefabricated casings 9 are arranged in plural in the circumferential direction, and the isocenter-side prefabricated casings 9, 9 are connected and integrated in the circumferential direction. The center-side prefabricated casing 9 has a radial direction line along a certain central angle, and the central portion 7 is divided into a plurality of shapes in the circumferential direction, and is formed to be slightly fan-shaped in plan view. By. The center side prefabricated box body 9 can divide the center portion 7 into two equal parts to 16 equal parts, preferably four equal parts to eight equal parts, and the example of the figure is preferably formed into eight equal parts. Further, since the center-side prefabricated casing 9 is a prefabricated member made of concrete, the manufacturing cost can be easily reduced by mass production. In order to reduce the manufacturing cost, it is preferable to form the center side prefabricated cases 9 all in the same shape.

As shown in FIG. 6, the center side prefabricated case 9 is a hollow case surrounded by a bottom plate 9a, an inner peripheral wall 9b, an outer peripheral wall 9c, side walls 9d and 9d, and a cover 9e, and can ensure the watertightness of the hollow portion. . The cover 9e may be configured to be integrally formed with the body portion, and the hollow portion may be sealed, or may be detachably attached to the body portion, and covered in a state of ensuring watertightness during assembly. The center-side prefabricated casing 9 is separately floated in a state in which air is sealed in the hollow portion, and can be transported at sea as compared with a manufacturing plant that floats and tows.

The center portion 7 is integrated by a plurality of the center side prefabricated cases 9, 9, ... connected in the circumferential direction. Preferably, the connecting method is connected by a plurality of through bolts that penetrate the side walls 9d, 9d of the adjacent center side prefabricated boxes 9, 9; the unboxing portion is provided on the outer peripheral wall 9c, and is inside the unboxing The bolts are joined to each other by the adjacent side walls 9d and 9d; or the outer side surfaces of the side walls 9d and 9d of the adjacent center side prefabricated boxes 9 and 9 are individually provided with a coupling structure, and are connected by connecting the coupling structure; or The subsequent agents connect the sides to each other and join. In the above-described coupling structure, it is preferable to use a one-touch coupling which is generally a coupling structure of a tunnel section. It is preferable to disclose by a specific example, as disclosed in Japanese Laid-Open Patent Publication No. 2011-99312. The coupling structure disclosed in this publication is embedded in the side wall 9d of the center side prefabricated case 9 on one side of the joint, and the end face is formed with one side anchor of the female screw hole. The reinforcing bar and the side wall 9d of the center side prefabricated case 9 on the other side of the joint are exposed and exposed, and the other end anchor bar of the fitting end is formed with the fitting hole and the fitting hole of the other side anchor bar a single-piece element having a truncated cone shape inserted therein, and a joint member having a male thread portion on one end side and a cylindrical portion formed by a plurality of cracks in the circumferential direction in the circumferential direction . The male threaded portion of the engaging element is screwed into the female threaded hole of the one side anchor bar, and the tubular portion of the engaging element is inserted into the fitting hole of the other side anchor bar, and is pressed by the single piece element Expanded to be unpluggable and fixed.

The cover 9e of the center side prefabricated casing 9 is provided with a water supply and drainage port 9f that communicates with the hollow portion inside. The water supply and discharge port 9f allows the ballast to be introduced into the interior and the ballast to be discharged from the inside. The water supply and drainage port 9f is closed by a plug which is not shown in the drawing, so that the watertightness of the hollow portion can be ensured. The ballast may be sand, gravel, crushed stone, minerals, metal powder particles or the like in addition to seawater or fresh water. The method of discharging and discharging the ballast material is preferably a method (fluid transport) described in JP-A-2012-201217.

On the other hand, the outer peripheral portion 8 is disposed on the outer circumference of the center portion 7, and has an appearance such as a donut shape as a whole. The outer peripheral portion 8 is integrally arranged in the circumferential direction by the outer peripheral side prefabricated cases 10, 10, ..., and the outer peripheral side prefabricated cases 10, 10, ... are connected and integrated in the circumferential direction.

The outer peripheral side prefabricated casing 10 is formed by dividing the outer peripheral portion 8 formed in a doughnut shape with a constant central angle and along a radial direction in the circumferential direction. In the outer peripheral side prefabricated casing 10, the outer peripheral portion 8 is divided into four equal parts to 32 equal parts, preferably divided into four equal parts to eight equal parts, and the pattern is preferably formed into an equal form of eight equal parts. Schematic example, Although the number of divisions of the central portion 7 and the outer peripheral portion 8 is equal to eight, it is also possible to have different division numbers. In other cases, it is preferable that the number of divisions of the center portion 7 from the outer peripheral portion 8 is more. Further, since the outer peripheral side prefabricated casing 10 is made of a prefabricated component made of concrete, the manufacturing cost can be easily reduced by mass production. In order to reduce the manufacturing cost, the outer peripheral side prefabricated casing 10 preferably has the same shape.

The outer peripheral side prefabricated case 10 is as shown in FIG. The hollow box surrounded by the bottom plate 10a, the inner peripheral wall 10b, the outer peripheral wall 10c, the side walls 10d and 10d, and the lid 10e ensures the watertightness of the hollow portion. The cover 10e may be configured such that the hollow portion is integrally sealed with the main body portion, or may be detached from the main body portion, and covered in a state of ensuring watertightness during assembly. The outer peripheral side prefabricated casing 10 is separately floated in a state in which air is sealed in the hollow portion, and is floated from the manufacturing plant and then towed, thereby further improving maritime transportability.

The cover 10e of the outer peripheral side prefabricated casing 10 is provided with a water supply and drainage port 10f that communicates with the hollow portion inside. Through the water supply and drainage port 10f, the ballast can be injected into the interior and the ballast can be discharged from the inside. The water supply and drainage port 10f is closed by a plug which is not shown in the drawing, so that the watertightness of the hollow portion can be ensured.

As shown in FIG. 4 and FIG. 5, the outer peripheral portion 8 has a plurality of PC steel members 12, 12, which are arranged in the circumferential direction by the outer peripheral side prefabricated cases 10, 10, ..., and are arranged in the circumferential direction so as to be in the circumferential direction. link. It is preferable that the PC steel materials 12, 12, ... are disposed outside the outer peripheral wall 10c in a cable-like manner, and the inner cable may be disposed inside the outer peripheral wall 10c.

In the outer cable mode, as shown in FIG. 4, the housing 10 is prefabricated on each outer peripheral side. The fixing member 13 is fixed in the vertical direction at the center portion in the circumferential direction of the outer surface of the outer peripheral wall 10c. The fixing member 13 is provided with a plurality of through holes which are inserted in the circumferential direction and which are inserted in the circumferential direction. One of the fixing members 13 of the outer peripheral side prefabricated box 10 is at least two adjacent to each other, and the fixing members 13, 13 of the peripheral side prefabricated boxes 10, 10 are one set, if the fixing members 13, 13 are crossed across the group... When the PC steel material 12 is provided in a normal manner, the both ends of the PC steel material 12 are tightened by a nut, and the tension can be introduced into the PC steel material 12 to be integrated.

As shown in Fig. 4, the arrangement of the PC steel material 12 is opposed to the vertical direction, and the tension of the PC steel materials 12, 12, ... is uniformly obtained by displacing one set of the outer peripheral side prefabricated cases 10, 10, ... one by one. It acts on all of the outer peripheral side prefabricated cases 10, 10, ..., and is preferably provided so that even if one PC steel material 12 is damaged and the tightening force is weakened, the tightening force can be maintained by the other PC steel materials 12, 12, ....

Further, in the inner cable type, a nut is inserted in order to insert the PC steel material 12 in the circumferential direction inside the outer peripheral wall 10c, and the nuts are connected to each other so that the outer peripheral side prefabricated cases 10, 10 are provided. When they are arranged side by side in the circumferential direction, the PC steel material 12 can be inserted into the nut connected to the adjacent outer peripheral side prefabricated cases 10, 10, and the ends thereof are tightened by the nut, thereby realizing the introduction of the tension into the PC steel material 12. Integrator.

The outer peripheral portion 8 may be closed by the PC steel material 12 or may be replaced by the same method as the connection of the central portion 7, and the side walls 10d and 10d which are connected to the adjacent outer peripheral side prefabricated casing 10 are connected to each other. They are connected by bolts; they are connected by bolts to the respective side walls 10d and 10d adjacent to the inside of the unboxing; they are connected by a coupling structure provided on the side surface, and are connected by the adhesive agent and the respective side faces.

The outer peripheral side prefabricated case 10 of the outer peripheral portion 8 may be in the radial direction Split into multiples. Specifically, as shown in FIG. 11 , each outer peripheral side prefabricated casing 10 can be divided into an inner prefabricated casing 10A and an outer prefabricated casing 10B in the radial direction, for example. At this time, the prefabricated casing 10A on the inner side in the radial direction and the prefabricated casing 10B on the outer side in the radial direction are connected to each other by the through bolts penetrating the contact wall surfaces in the circumferential direction.

The center portion 7 and the outer peripheral portion 8 are joined and integrated in the circumferential direction contact surface. Specifically, the outer peripheral wall 9c of the center side prefabricated casing 9 and the inner peripheral wall 10b of the outer peripheral side prefabricated casing 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) between the center portion 7 and the outer peripheral portion 8 is not particularly limited. However, in this embodiment, the lower side is formed to be inclined toward the inner side in the radial direction from the upper side. In other words, as shown in FIGS. 6 to 8, the outer surface of the outer peripheral wall 9c of the center side prefabricated casing 9 (the surface in contact with the outer peripheral portion 8) and the outer peripheral wall 10b of the outer peripheral side prefabricated casing 10 (with the central portion) 7 contact surface), the lower side of the individual system is inclined toward the inner side in the radial direction from the upper side. It is preferable that the circumferential contact surface of the center portion 7 and the circumferential contact surface of the outer peripheral portion 8 are inclined at the same shape (angle). Further, the shape of the circumferential contact surface between the center portion 7 and the outer peripheral portion 8 may be a vertical surface as shown in FIG. 9, and as shown in FIG. 10, the lower side may be inclined outward in the radial direction from the upper side. Further, the inclination of the circumferential contact surface may be linear as shown in the example, or may be formed in an arc shape that bulges outward or inside the radial direction.

In the foundation structure 2, the ballast is introduced into the center portion 7, and the outer peripheral portion 8 is not loaded with the ballast or the amount of the ballast is reduced, and the outer peripheral portion 8 is buoyed to the seabed. Here, "buoy generating" refers to a state in which buoyancy is greater than its own weight and floats on the surface of the water under unrestricted conditions.

Therefore, when the foundation of the bed type is placed on the sea floor or floated, as shown in Fig. 12, the foundation structure itself has a static level of stability due to the buoyancy of the outer peripheral portion 8. In other words, the static force stability of the entire base is excellent by the action of the forward force (buoyancy) toward the upper side of the center portion 7. Further, in particular, in the vicinity of the water surface, as shown in FIG. 13(A), when the foundation structure 2 is in an inclined state, the buoyancy on the sink side is increased, and the buoyancy phenomenon on the floating side causes the foundation structure 2 to be automatically applied when the tilt is applied. Maintain horizontal force (resilience) for dynamic stability.

When the foundation structure 2 is placed on the sea floor, it is preferable to supply the ballast only to the center portion 7, and it is preferable to generate the buoyancy without causing a large buoyancy in the outer peripheral portion 8.

Further, after the foundation structure 2 is placed in a bed, the buoyancy is maintained in the outer peripheral portion 8 in order to increase the sliding resistance, and the ballast is introduced into the outer peripheral portion 8 after the implantation to be in a full water state.

As shown in FIG. 3, the center side prefabricated case 9 and the outer peripheral side prefabricated case 10 are formed separately so that the same radial direction line extending to the center portion 7 and the outer peripheral portion 8 is divided in the circumferential direction. . Thereby, as shown in FIG. 8(B), the side wall 9d of the center side prefabricated case 9 and the side wall 10d of the outer peripheral side prefabricated case 10 can be formed in substantially the same plane. In this case, in the state in which one outer peripheral side prefabricated case 10 is disposed on the outer side of one center side prefabricated case 9, the entire plan view is formed in a substantially fan shape.

As shown in Fig. 8(B), the side wall 9d of the center side prefabricated case 9 and the side wall 10d of the outer peripheral side prefabricated case 10 are provided with a continuous power cable wiring groove 14 on the center side and the outer circumference side in the radial direction. It is better. By wiring the power cable to the cable wiring trench 14, the power cable can be easily introduced, thereby reducing the construction of the sea by the diver, and the like. Good workability.

Further, the bottom surface of the foundation structure 2 may be flat, or may have irregularities formed by providing a plurality of protrusions. By the bottom surface being concave and convex, even if the seafloor flat is not constructed, it is easy to obtain a horizontal adjustment of the seafloor which can absorb a certain degree, and most of the protrusions are engaged with the concave and convex of the sea bottom, so that the grounding of the foundation structure 2 for the horizontal direction can be improved. resistance.

〔Construction method〕

Hereinafter, a construction method of the offshore wind power generation facility 1 will be described in detail with reference to Figs. 14 to 19 .

(Step 1)

In the sea near the shore wall, the offshore wind power plant 1 is assembled while being placed on the seabed. In the assembly of the offshore wind power generation facility 1, first, as shown in Figs. 14 and 15, the center-side prefabricated casings 9, 9 are collectively arranged in the circumferential direction, whereby the isocenter-side prefabricated casings 9, 9 are ... After the center portion 7 is joined in the circumferential direction, as shown in FIGS. 16 and 17, the outer peripheral side prefabricated cases 10, 10, ... are arranged in the circumferential direction on the outer circumference of the center portion 7, and the outer peripheral side prefabricated case is thereby 10, 10... The outer peripheral portion 8 is combined by being joined in the circumferential direction. Next, as shown in FIG. 18, the center side prefabricated case 9 and the outer peripheral side prefabricated case 10 are individually fixed while securing watertightness, and the cover 9e and 10e are fixed, and the assembly of the base structure 2 is completed. In order to ensure the stability, the assembly of the offshore wind power generation equipment 1 is carried out in the state in which the foundation structure 2 is placed in the seabed, but in this case, each of the tanks 9..., 10... is previously placed so that it can be placed on the bed. Ballast (water) at the sea level.

Next, as shown in FIG. 19(A), the tower 3 is erected on the above-mentioned foundation structure 2, and the equipment nacelle 4 and the plurality of windmill blades 5, 5... at the top of the tower 3 are used to generate offshore wind power. The electrical device 1 is assembled.

In the assembly of the offshore wind power generation facility 1 described above, a crane installed on land or a FC ship at sea or the like can be used.

(Step 2)

At the time of construction, the ballast (water) which is put into the tanks 9..., 10... is discharged, as shown in Fig. 19(B), in the state where the offshore wind power plant 1 is floating, it is towed by the tow boat 15 Air to the setting place on the sea.

(Third Step) As shown in Fig. 19(C), at least the ballast is introduced into the center portion 7, and the foundation structure 2 is placed on the seabed to complete the construction. At this time, by adjusting the input amount of the ballast, the grounding pressure can be adjusted in accordance with the seabed geology. In addition, when the height of the sea floor is predicted to be different, the ballast can be reduced and the thickness of the base concrete can be increased to match the situation.

As described above, the offshore wind power generation facility 1 assembles the offshore wind power generation facility 1 using a crane or the like in the waters near the bank wall, and tow the offshore wind power generation facility 1 to the sea, and then puts the ballast to the base. Since the structure 2 is placed in a bed, assembly work using a special work boat at sea is not required, and workability and work cost can be improved. In addition, even if the offshore wind power generation facility 1 is placed on the seabed in an implantation state and is floated by discharging the loaded ballast, the residue does not remain in the sea area, and thus it is easy to relocate.

[repair method]

On the other hand, in the case of large-scale repair, it can be carried out by the method opposite to the construction method at the time of construction described above.

(Step 1)

As shown in Fig. 19(C), the offshore wind turbine generator 1 is floated by discharging the ballast of the center portion 8.

(Step 2)

As shown in Fig. 19(B), in the state where the offshore wind power plant 1 is floating, it is towed to the sea near the bank by the towing vessel 15.

(Step 3)

As shown in Fig. 19(A), the ballast in which the foundation structure 2 is placed at the seabed is introduced, and the repair work is performed in the state where the foundation structure 2 is placed on the seabed.

[Other types of examples]

(1) In the above-described embodiment, the basic structure 2 is used as an example of the foundation of the offshore wind power generation facility, and the above-described basic structure 2 can also be applied to other marine power generation equipment. Specifically, as shown in FIG. 20, it can be used as a basic structure of a wave power generation facility, or as a basic structure of a tidal power and ocean current power generation device as shown in FIG. In addition, it can also be used as a basic structure of a hybrid power plant in which the above-described wind power generation equipment and such wave power generation equipment, tidal power, and ocean current power generation equipment are combined.

1‧‧‧ Offshore wind power equipment

2‧‧‧Basic structure

3‧‧‧ Tower

4‧‧‧Cabinet

5‧‧‧ windmill blades

6‧‧‧Deck

7‧‧‧ Central Department

8‧‧‧The outer part

9‧‧‧Center side prefabricated cabinet

10‧‧‧Prefabricated box on the outer circumference

Claims (8)

An offshore wind power generation device characterized by being a foundation structure placed on a seabed in an implantation state, a tower built on the foundation structure, and a cabin and a plurality of windmills installed at the top of the tower An offshore wind power generation device formed by a fin; and the basic structure is formed such that the tower is formed in a circular shape in a plan view as a center, and is disposed at a center portion disposed on a center side in a radial direction The outer peripheral portion is formed by a peripheral portion; the central portion is formed by a center-side prefabricated box made of a plurality of concretes divided into a plurality of outer shapes in the circumferential direction thereof, and is formed by the center side prefabricated box in the circumferential direction The outer peripheral portion is formed of a plurality of outer peripheral side prefabricated cases made of a plurality of concretes which are divided into a plurality of outer shapes in the circumferential direction, and is configured by connecting the outer peripheral side prefabricated cases in the circumferential direction; The center portion and the outer peripheral portion are joined to each other in a circumferential direction contact surface. The offshore wind power generation equipment according to claim 1, wherein the basic structure is that a ballast is introduced in the center portion, and that the ballast is not introduced into the outer peripheral portion or the amount of ballast is reduced. The outer peripheral portion is buoyed and is placed on the seabed in a state where buoyancy occurs. The offshore wind turbine generator according to the first or second aspect of the invention, wherein the outer peripheral portion is connected in the circumferential direction, and the outer peripheral surface of the outer peripheral side prefabricated casing is fastened by PC steel, and the PC steel material is Arranged along the circumference. The offshore wind power generation equipment according to any one of the first to third aspects of the present invention, wherein the center portion is provided by a through bolt or a side wall that penetrates each side wall of the center side prefabricated casing The coupling structure is connected in the circumferential direction. The offshore wind power generation equipment according to any one of the first to fourth aspects of the present invention, wherein the side wall of the center side prefabricated casing and the side wall of the outer peripheral side prefabricated casing are provided with a power cable wiring groove . The offshore wind power generation facility according to any one of the first to fifth aspects of the present invention, wherein the bottom surface of the foundation structure is formed with irregularities. The offshore wind turbine generator according to any one of the first to sixth aspects of the present invention, wherein each of the outer peripheral side prefabricated casings constituting the outer peripheral portion is divided into a plurality of radial directions and adjacent radii The prefabricated box on the inner side of the direction and the prefabricated box on the outer side in the radial direction are connected to each other. A method for constructing an offshore wind power generation device, which is characterized by the construction method of an offshore wind power generation device as described in any one of claims 1 to 7, and which is formed by the following steps, In the sea area near the bank, the center side prefabricated box is arranged in the circumferential direction in a seabed state, and the center portion is combined in the circumferential direction, and the outer peripheral side is formed on the outer periphery thereof. The prefabricated casings are arranged in a plurality of rows in the circumferential direction, and the outer peripheral portions are combined by joining in the circumferential direction, and after the assembly of the basic structure is completed, the tower is erected on the base structure, and the engine room and the plurality of equipment are installed at the top of the tower. a windmill blade combining the offshore wind power generation equipment; a second step of causing the offshore wind power generation device to float in a floating state; and a third step, the ballast is introduced into the center portion, and the outer peripheral portion is not put into the Under the condition of the ballast or the reduction of the amount of the ballast, the aforementioned foundation structure is placed on the seabed in a state where buoyancy is generated in the outer peripheral portion.