JP2018016302A - Offshore wind power generation facility and installation method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable lifting and fixing of a tower to be easily and safely performed in a spar-type offshore wind power generation facility in which the tower is housed in a floating body and is lifted and fixed by a tower lifting facility during installation at sea.SOLUTION: An offshore wind power generation facility comprises: a floating body 2; mooring cables 4, 4 ...; a tower 5; and a nacelle 6 and multiple wind turbine blades 7, 7 ... which are installed at a top part of the tower 5. The floating body 2 has a bottomed hollow part opening at an upper end part. An entire part or a large part of the lower end side of the tower 5 may be housed in the floating body, and the tower 5 may be lifted by a tower lifting facility. The offshore wind power generation facility integrally includes a shaft structure 8 continuing into a lower end of the tower 5. Vertical movement of the shaft structure 8 is guided by a guide member provided in the floating body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spar-type offshore wind power generation facility in which a tower is accommodated inside a floating body, and the tower is lifted and fixed by a tower lifting / lowering facility at the time of construction at sea, and a construction method thereof.

  Conventionally, power generation methods such as hydropower, thermal power, and nuclear power generation have been mainly employed, but in recent years, wind power generation that generates power using natural wind has attracted attention from the viewpoint of effective use of the environment and natural energy. There are two types of wind power generation facilities: land-based and water-based (mainly sea-based). In Japan, where mountainous landforms are located behind the coast, there are few plains where stable wind can be expected in the coast. It is in. On the other hand, Japan is surrounded on all sides by the sea, and it has the advantage that the wind suitable for power generation can be easily obtained and there are few restrictions on installation. In recent years, therefore, many offshore wind power generation facilities have been proposed.

  The present applicant has also proposed a spar-type offshore wind power generation facility and its construction method in Patent Document 1 below. Specifically, the floating body is composed of a plurality of concrete precast cylindrical bodies stacked in the height direction, and each precast cylindrical body is fastened and integrated with PC steel to form a lower concrete floating body structure. A spar type floating body structure having a bottomed hollow part having an upper end opened, and the tower at least during the construction. We proposed an offshore wind power generation facility that can be moved up and down by a tower lifting device provided on the top and can be accommodated inside the floating body. In addition, as a construction method, the first procedure is to float sideways on the sea with the tower inside the floating body and tow to the offshore installation location, and to put the floating body upright by throwing ballast at the offshore installation location. The second step of standing up, the third step of installing the nacelle and the wind turbine blade in a state where the tower is raised to an arbitrary height position by the tower elevating equipment, and the tower to the normal height position The construction method of the offshore wind power generation equipment which consists of the 4th procedure to raise and fix was proposed.

JP 2010-223114 A

  In the offshore wind power generation facility according to Patent Document 1, the nacelle and the windmill blade can be attached in a state where the tower is lowered, so that the work at a high place is reduced and the construction can be safely performed. In addition, it is possible to work safely by lowering the tower during maintenance after operation, and in the event of strong winds and waves, lowering the tower will increase the stability and reduce the risk of damage. become able to.

  However, in the invention described in Patent Document 1, since the PC steel material is directly attached to the lower end of the tower and jacks up to the upper part of the floating body, there is a problem that the tower tends to be unstable, and the tower is Since the tower is fixed to the floating body with a fixing bracket in the state that it is completely pulled up from the floating body, there is a problem that the fixing work of the tower on the floating body that is shaken by the wave becomes a dangerous work. . Furthermore, when the tower is lowered during large-scale repairs, strong winds, or waves, there is a problem that the unlocking of the tower or the lowering work on the floating body swaying by the waves is dangerous work.

  Therefore, the main problem of the present invention is that in the spar type offshore wind power generation facility in which the tower is accommodated inside the floating body, and the tower is lifted and fixed by the tower lifting equipment at the time of construction on the sea, the tower is lifted and fixed. An object of the present invention is to provide a spar-type offshore wind power generation facility and a method for constructing the same that can easily and safely perform the unlocking and lowering operations of the tower.

In order to solve the above-mentioned problem, the present invention according to claim 1 includes a floating body, a mooring line, a tower, a nacelle and a plurality of windmill blades installed at the top of the tower, and the floating body has an upper end portion. A spar type floating body structure having an open bottomed hollow portion, and the tower can be accommodated in the floating body entirely or most of the lower end side, and the tower can be moved up and down by tower lifting equipment. In offshore wind power generation facilities,
Offshore wind power generation characterized in that a shaft structure is integrally provided continuously at the lower end of the tower, and the shaft structure is guided in vertical movement by a guide member provided inside the floating body. Facilities are provided.

  In the first aspect of the present invention, the shaft structure is integrally provided continuously to the lower end of the tower, and the shaft structure is guided in the vertical movement by the guide member provided inside the floating body. It has a structure.

  Therefore, when the vertical movement of the shaft structure continuously provided from the lower end of the tower is firmly guided by the guide member, the tower can be stably pulled up when the tower is pulled up by the lifting equipment. In addition, when the lower end of the tower is connected to the upper part of the floating body after pulling up, the vertical movement of the shaft structure extending from the lower end of the tower is stably guided to the inside of the floating body, so that it shakes in the waves. Even on the ocean, the behavior of the tower and the behavior of the floating body are integrated, so that the tower can be fixed easily and safely. Furthermore, even when the tower is lowered during large-scale repairs, strong winds, or waves, the vertical movement of the shaft structure extending from the bottom of the tower is stably guided inside the floating body, so that the tower is fixed. Release and lowering operations can be performed easily and safely.

  According to a second aspect of the present invention, there is provided the offshore wind power generation facility according to the first aspect, wherein the shaft structure is a frame structure or a tubular structure.

  The invention according to claim 2 shows a specific structural example of the shaft structure. The shaft structure is preferably a frame structure or a tubular structure. In terms of reducing the weight, it is desirable to use a framework structure.

  As a third aspect of the present invention, there is provided the offshore wind power generation facility according to any one of the first and second aspects, wherein a joint between the lower end of the tower and the upper end of the floating body is joined by a ring-shaped member. .

  In the invention according to the third aspect, since the tower can be stored in the floating body in the present invention, the lower end outer diameter of the tower is smaller than the upper end inner diameter of the floating body. Therefore, a ring-shaped member is interposed between the lower end of the tower and the upper end of the floating body so as to join them together. By providing the ring-shaped member, the external force acting on the tower is not transmitted to the shaft structure but directly to the floating body.

  The present invention according to claim 4 provides the offshore wind power generation facility according to claim 3, wherein the ring-shaped member is separable in the circumferential direction.

  In the invention described in claim 4, the ring-shaped member that can be divided in the circumferential direction is used. Since the shaft structure is continuously provided from the lower end of the tower, the ring-shaped member can be used as a tower without any trouble even if the shaft structure is present by using a member that can divide the ring-shaped member in the circumferential direction. It becomes possible to install between floating bodies.

  As this invention which concerns on Claim 5, while providing the electrical equipment inside the said floating body, the said electrical equipment is arrange | positioned around the center part where the said tower and a shaft structure are arrange | positioned. An offshore wind power generation facility as described above is provided.

  In the invention according to the fifth aspect, usually, the electrical equipment disposed inside the floating body is arranged around the center so that the tower and the shaft structure can pass through the center. Conventionally, electrical equipment has been installed above the floating body. However, by placing the electrical equipment inside the floating body, the center of gravity of the floating body can be lowered, and the stability of the floating body is increased.

  As for this invention which concerns on Claim 6, the said tower raising / lowering equipment is connected to the lower end of the shaft structure by several jacks equally arranged in the circumferential direction on the deck provided in the floating body upper part, The offshore wind power generation facility according to any one of claims 1 to 5, wherein an end of the PC cable is connected to the jack.

  The invention described in claim 6 shows a specific structural example of the tower lifting equipment. As tower lifting equipment, a plurality of jacks equally arranged in the circumferential direction on a deck provided on the upper part of the floating body, and one end connected to the lower end of the shaft structure and the other end connected to the jack It is desirable to make up with cables. The tower structure can be simplified by connecting one end of the PC cable to the lower end of the shaft structure.

As this invention which concerns on Claim 7, it is the construction method for installing the offshore wind power generation equipment in any one of Claims 1-6 on the sea,
On the ocean, the floating body is in an upright state, the shaft structure is accommodated inside the floating body, the tower is connected to the upper portion of the shaft structure, and the upper portion of the tower is connected to the upper end of the floating body. And a first procedure that also projects
A second procedure of installing at least a nacelle at the top of the tower by a hoist ship;
There is provided a method for constructing an offshore wind power generation facility, which includes a third step of lifting the tower to a normal height position by the tower lifting and lowering unit and joining the lower end of the tower and the upper end of the floating body. .

  The invention according to claim 7 shows a construction method of the offshore wind power generation facility. The nacelle and wind turbine blades can be attached while the tower is lowered, and the work at high places is reduced and the work can be performed safely.

  The wind turbine generator according to claim 8, wherein the wind turbine blade is attached stepwise or in a lump within a period from the second procedure to after the completion of the third procedure. A facility construction method is provided.

  The invention according to claim 8 defines the installation timing of the wind turbine blade. Specifically, the wind turbine blade can be performed stepwise or in a lump within a period from the second procedure to the end of the third procedure. That is, the wind turbine blades may be attached step by step or in a batch within a predetermined period in accordance with the construction procedure and construction conditions.

  As described above in detail, according to the present invention, in the spar type offshore wind power generation facility in which the tower is accommodated inside the floating body, and the tower is lifted and fixed by the tower lifting equipment at the time of construction on the sea, the tower lifting operation and It is possible to easily and safely perform the fixing work and the unlocking and lowering work of the tower.

1 is an overall schematic diagram of an offshore wind power generation facility 1 according to the present invention. The precast cylindrical body 12 (13) is shown, (A) is a longitudinal sectional view, (B) is a plan view (a view taken along the line B-B), and (C) is a bottom view (a view taken along the line C-C). FIG. 3 is a schematic diagram (A) and (B) of tight-bonding between precast cylindrical bodies 12 (13). It is a longitudinal cross-sectional view which shows an upper steel floating body structure part. 1 is an enlarged longitudinal sectional view of a main part of an offshore wind power generation facility 1. Furthermore, it is the expanded longitudinal cross-sectional view. It is a top view (the VII-VII line arrow view of FIG. 6) of the deck part 3. FIG. It is a cross-sectional view of the floating body 2 (a view taken along line VIII-VIII in FIG. 6). It is construction procedure figure (the 1) of offshore wind power generation equipment. It is construction procedure figure (the 2) of offshore wind power generation equipment. It is construction procedure figure (the 3) of offshore wind power generation equipment. It is construction procedure figure (the 4) of offshore wind power generation equipment. It is construction procedure figure (the 5) of offshore wind power generation equipment. It is construction procedure figure (the 6) of offshore wind power generation equipment. It is a principal part enlarged view which shows the joining procedure of the lower end of the tower 5, and the upper end of the floating body 2. FIG.

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

  As shown in FIG. 1, the offshore wind power generation facility 1 includes a floating body 2, a deck 3 installed on the top of the floating body 2, mooring lines 4, 4... Connected to the floating body 2, and the floating body 2. Of the tower 5, a nacelle 6 installed at the top of the tower 5, and a plurality of windmill blades 7, 7... The shaft structure 8 is integrally provided continuously, and the shaft structure 8 is guided in vertical movement by a guide member provided inside the floating body 2.

  This will be described in more detail below.

  The floating body 2 has a spar type floating body structure having a bottomed hollow portion with an open upper end, and a plurality of precast cylindrical bodies 12 to 13 made of concrete are stacked in the height direction, and each precast cylindrical body 12 to 13 is composed of a lower concrete floating structure 2A, which is tightly coupled with PC steel, and an upper steel floating structure 2B connected to the upper side of the lower concrete floating structure 2A. A synthetic precast member 13 is interposed at the boundary between the side concrete floating structure 2A and the upper steel floating structure 2B, and both are joined. The upper steel floating body structure portion 2B has a variable cross-sectional shape in which the outer diameter dimension is gradually reduced in the height direction.

  The lower concrete floating structure 2A is composed of a precast cylindrical body 12 made of concrete and a lower half portion of the synthetic precast member 13. As shown in FIG. 2, the precast cylindrical body 12 is a circular cylindrical precast member having the same cross section in the axial direction, and each is manufactured using the same mold or by centrifugal molding. The manufactured hollow precast member is used.

  In addition to the reinforcing bars 20, sheaths 21, 21... For inserting the PC steel bars 19 are embedded in the wall surface at appropriate intervals in the circumferential direction. A sheath widened portion 21a is formed at the lower end of the sheaths 21, 21... So that a coupler for connecting the PC steel bars 19 can be inserted, and a fixing anchor plate is fitted on the upper portion. A box opening portion 22 is provided for installation. In addition, a plurality of suspension fittings 23 are provided on the upper surface.

  As shown in FIG. 3 (A), the precast cylindrical bodies 12 are tightened by inserting the PC steel rods 19, 19... Extending upward from the lower-stage precast cylindrical body 12 into the sheaths 21, 21. However, if the precast cylindrical bodies 12 and 12 are stacked, the anchor plate 24 is fitted into the box opening portion 22, and tension is introduced into the PC steel bar 19 by the nut member 25 to achieve integration. A grout material is injected into the sheath 21 from the grout injection hole 27. The hole 24a formed in the anchor plate 24 is a grout injection confirmation hole, and the filling of the grout material is completed when the grout material is discharged from the confirmation hole.

  Next, as shown in FIG. 3 (B), when the coupler 26 is screwed into the protruding portion of the PC steel bar 19, and the upper PC steel bars 19, 19,. The PC steel rods 19, 19 are stacked while being inserted through the sheaths 21, 21 ... of the precast cylindrical body 12, and the procedure for fixing the PC steel rod 19 is sequentially repeated according to the above procedure. At this time, an adhesive 28 such as an epoxy resin or a sealing material is applied to the joint surface between the lower-stage precast tubular body 12 and the upper-stage precast tubular body 12 in order to ensure waterproofness and join the mating surfaces. .

  Next, as shown in FIG. 4, the synthetic precast member 13 has a composite structure of a concrete precast tubular body 16 and a steel tubular body 17. These are manufactured integrally. The precast tubular body 16 has an outer diameter dimension obtained by reducing the thickness of the steel tubular body 17, and the lower half portion of the steel tubular body 17 is fitted on the outer periphery. The upper end surface of the precast cylindrical body 16 is a fastening surface of the PC steel rod 19.

  As shown in FIG. 4, the upper steel floating body structure portion 2 </ b> B includes an upper half portion of the synthetic precast member 13 and steel tubular bodies 14 and 15. The lower-stage steel tubular body 14 has the same outer diameter as that of the synthetic precast member 13 and is connected to the synthetic precast member 13 by bolts, welding, or the like (in the illustrated example, bolt fastening). The upper-stage steel tubular body 15 has an outer diameter smaller than that of the lower-stage steel tubular body 14 and has a variable cross-sectional shape. Connected by welding or the like. The upper end of the upper steel tubular body 15 is left open, the boundary between the upper steel tubular body 15 and the lower steel tubular body 14 and the lower steel tubular body. A space is not partitioned at the boundary between 14 and the steel tubular body 17, and a hollow portion for accommodating the tower 5 is formed inside the floating body 2.

  On the other hand, the tower 5 can be moved up and down by tower elevating equipment 9, 9... Provided on the deck 3 at least during construction (at the time of assembly on the ocean), and most or most of the lower end side is inside the floating body 2. It can be accommodated. For example, in the case of a 2 MW class power generation facility, the flooded water L of the floating body 2 is set to approximately 60 m or more.

  The fact that the entire tower 5 can be accommodated inside the floating body 2 assumes that the tower 5 is previously accommodated in the floating body 2 and towed, and most of the lower end side of the tower 5 is inside the floating body 2. “To be accommodated” assumes that the tower 5 is inserted and installed from the upper end opening of the floating body 2 at the standing position of the floating body 2 as described later.

  The tower 5 is made of steel, concrete, or PRC (prestressed reinforced concrete), but is preferably made of steel so as to reduce the total weight. The nacelle 6 is a device equipped with a generator that converts the rotation of the windmill into electricity, a controller that can automatically change the angle of the blade, and the like.

  As shown in detail in FIGS. 5 and 6, the shaft structure 8 includes a frame structure configured by combining shapes such as H-shaped steel and square-shaped steel in order to reduce weight. Has been. As shown in the cross-sectional view of FIG. 8, the shaft structure 8 of the illustrated example includes a plurality of frame bodies 8A, 8A,. 8B, 8B... Are connected at a predetermined interval in the vertical direction. The shaft structure 8 is left after service, and is located at the lower end of the tower 5, that is, in the vicinity of the water surface or in the range of several tens of meters therefrom. Since the center of gravity of the structure combined with the floating body 2 and the tower 5 is shifted to the upper side because it is located in the middle or above the upper side, the weight is reduced as much as possible to prevent the center of gravity from moving upward. Is desirable.

  As shown in FIG. 6, the tower 5 is connected with a tower-side connecting member 5 a in the form of a steel ring continuously at the lower end of the main body 5 </ b> A of the tower 5. The frame member 8A and the extending member 8a provided at the upper end are connected and integrated with the inner surface of the joint member 5a by connecting means such as welding or bolts and nuts.

  The shaft structure 8 is guided to move in the vertical direction by a guide member provided inside the floating body 2. Specifically, as shown in FIG. 6, a plurality of guide rails 30 in the illustrated example are arranged along the vertical direction inside the floating body 2. These guide rails 30 are supported on the inner surface of the tower 5 by a circumferential reinforcing member 39 having a transverse T-shaped cross section provided along the circumferential direction at an appropriate interval in the height direction.

  Then, the tip end portion of the bracket 31 protruding in the horizontal direction from the corner portion of the shaft structure 8 slides along the guide rail 30, so that the vertical movement of the shaft structure 8 is laterally blurred. It is guided so that it can be done smoothly.

  In the present embodiment, the shaft structure 8 is constituted by a frame structure, but it may be a tubular structure constituted by a steel pipe or the like.

  As shown in FIG. 7, the tower elevating equipment 9 has one end connected to a plurality of center hole jacks 32, 32 arranged on the deck 3 in the circumferential direction and the lower end of the shaft structure 8. The other end is composed of a PC cable 33 connected to the center hole jack 32. A plurality of electric pump units 34 for driving the center hole jack are arranged on the deck 3. A double twin jack or the like may be used instead of the center hole jack.

  In the offshore wind power generation facility 1, one end of the PC cable 33 is not connected to the tower 5, but is connected to the shaft structure 8, so that the tower structure can be made simple.

  In the floating body 2, various electrical equipments 35 are disposed. In the present invention, the tower 5 and the shaft structure 8 are accommodated in the floating body 2 and are movable in the vertical direction. As shown in FIG. 5, the electrical equipment 35 is disposed around the center portion where the tower 5 and the shaft structure 8 are disposed. That is, the upper steel floating body structure 2B has a variable cross-sectional shape in which the outer diameter dimension is gradually reduced in the height direction, and the electric equipment 35 is a portion having a relatively large outer diameter dimension. The shaft structure 8 has a size that fits in a space that avoids the central range through which the shaft structure 8 passes, and is distributed in the circumferential direction.

  On the other hand, as shown in FIG. 6, the joint between the lower end of the tower 5 and the upper part of the floating body 2 is a frustoconical ring-shaped member in which the diameter of the upper end is smaller than the diameter of the lower end. It is joined by a joining member 36 that can be divided in the circumferential direction. That is, the outer diameter of the tower-side connecting member 5 a provided at the lower end of the tower 5 is accommodated inside the floating body 2, and thus is configured to be smaller than the inner diameter of the upper end portion of the floating body 2. Therefore, the joining member 36 is a frustoconical ring-shaped member whose upper end diameter is smaller than the lower end diameter. In addition, in order to enable joining with the upper part of the floating body 2 in a state where the tower 5 is pulled up, the joining member 36 can be divided in the circumferential direction, and preferably in a circumferentially divided manner as shown in the example. Has been. Therefore, as will be described later, the tower 5 is in a state of being pulled up, and the joining members 36 having a two-divided structure are respectively fitted from the side, are connected in the circumferential direction, are bolted to the lower end of the tower 5, and the floating body 2 It is structured to be bolted to the upper end of the bolt. In the illustrated example, the joint member 36 is connected to the tower 5 and the floating body 2 by a flange joint facing inward. By providing the joining member 36, the external force acting on the tower 5 is not transmitted to the shaft structure 8 but directly to the floating body 2.

  Further, on the sea surface of the floating body 2, a welcoming facility 37 and a passage deck 38 are provided so that workers and the like can enter the offshore wind power generation facility 1 during construction and maintenance.

[Construction procedure]
Hereinafter, the construction procedure of the offshore wind power generation facility 1 will be described in detail with reference to FIGS.

(First procedure)
On the ocean adjacent to the production yard, as shown in FIG. 9, the floating body 2 is floated sideways on the sea, and is towed to a standing place by a tow ship 18. The shaft structure 8 is accommodated in the floating body 2 in advance.

  In the lower concrete floating structure 2A and the upper steel floating structure 2B of the floating body 2, the lower concrete floating structure 2A side is heavier, so that the balance adjustment floating body 42 is floated and installed on this floating body. It is desirable that one end of the wire drawn out from the winch 43 is connected to the end of the lower concrete floating body structure portion 2A and adjusted so that the floating body 2 is horizontal. The upper end opening of the upper-stage steel tubular body 15 is closed. Further, the floating body 2 may be adjusted by pouring ballast water (water or seawater) in a state where it floats sideways on the sea to adjust the flooding. The standing place is an offshore place where a predetermined ballast is introduced to bring the floating body 2 up.

  In place of the method of towing by the towed ship 18, although not shown, the floating body 2 may be mounted on a carriage and transported to an offshore installation location and floated on the ocean with a crane at the offshore installation location. In this case, it is preferable not to put ballast water or ballast material into the floating body 2.

  As shown in FIG. 10, when arriving at the standing place, the ballast 41 (water, seawater, ballast material) is introduced into the floating body 2, and the wire is gradually fed from the winch 43 on the balance-adjusting floating body 42. The floating body 2 is slowly erected in an upright state.

  As the ballast material, a powdery granular material having a specific gravity higher than that of water is used. Specifically, minerals including sand, gravel, barite, metal powder such as iron and lead, and metal including metal particles It is preferable that it consists of 1 type or multiple types of combination among classes. Moreover, mortar can also be mixed suitably.

  As shown in FIG. 11, the floating body 2 is landed on the seabed by injecting ballast 41.

  A tower lifting / lowering equipment 9 is installed on the deck 3, and the tower 5 is suspended inside the floating body 2 by a hoist ship 44, and is connected to the shaft structure 8 previously stored in the floating body 2 for integration. . In this state, the upper portion of the tower 5 is protruded from the upper end of the floating body 2. Note that the amount of protrusion of the tower 5 is such that the tower elevating equipment 9 and the like are provided on the deck 3 so that the installation work of the nacelle 6 is not hindered in the second step of the latter stage.

As mentioned above, although the typical example about the 1st procedure was shown, various changes are possible. Specifically,
(1) In the first procedure, when the floating body 2 is floated sideways on the sea and towed to a standing place by the tow ship 18, only the shaft structure 8 is stored inside the floating body 2. The tower 5 may be housed in the floating body 2 and towed.

In this case, the tower lifting / lowering equipment 9 pulls up the tower 5 until the upper part of the tower 5 protrudes from the upper end of the floating body 2 at the construction site.
(2) In the first procedure, the shaft structure 8 was towed to the standing position while the shaft structure 8 was housed inside the floating body 2, but only the floating body 2 was towed to the standing position without housing the shaft structure 8. Then, after standing up, the separately transported shaft structure 8 may be inserted into the floating body 2 and the lower end of the tower 5 may be connected to the upper end of the shaft structure 8.
(3) In the first procedure, the floating body 2 is bottomed, but it is also possible to work while floating on the ocean. In this case, it is desirable to connect the mooring lines 4, 4... To the floating body 2 to stabilize the floating body 2.

  In any case, in the first procedure, the floating body 2 is erected upright on the ocean regardless of whether or not there is a bottom, and the shaft structure 8 is accommodated in the floating body 2, and the shaft structure The operation is performed until the tower 5 is connected to the upper portion of the body 8 and the upper portion of the tower 5 is protruded from the upper end of the floating body 2.

(Second procedure)
Next, as shown in FIG. 12, at least a nacelle 6 is installed on the top of the tower 5 by a hoist ship. “At least the nacelle 6 is installed” means that a part of the wind turbine blades 7, 7... May be installed at the same time. Preferably, as shown in FIG. 12, it is desirable that the wind turbine blades 7 (two) positioned in the upper part of the nacelle 6 are included together with the nacelle 6.

  Next, as shown in FIG. 13, the tower lift 9 raises the wind turbine blade 7 to a predetermined height, and then installs the wind turbine blade 7 positioned below the rest by the hoist ship 44. The operation is completed until the blades 7, 7. When the tower 5 is pulled up by the tower lifting / lowering equipment 9, in the present invention, the vertical movement of the shaft structure 8 continuously provided from the lower end of the tower 5 is firmly guided by the guide member. Can be raised stably.

(Third procedure)
As shown in FIG. 14, the tower 5 is pulled up to a normal height position by the tower lifting equipment 9, and the lower end of the tower 5 and the upper end of the floating body 2 are coupled. The connection is achieved by interposing the above-described joining member 36 between the lower end of the tower 5 and the upper end of the floating body 2. Specifically, as shown in FIG. 15, the tower 5 is held with a space corresponding to the height of the joining member 36 between the lower end of the tower 5 and the upper end of the floating body 2. The joint members 36 </ b> A and 36 </ b> B having a two-divided structure are respectively fitted and connected in the circumferential direction, and are bolted to the lower end of the tower 5 and bolted to the upper end of the floating body 2. In the present invention, when the tower 5 is connected to the floating body 2, the shaft structure 8 extending from the lower end of the tower 5 is stably supported inside the floating body 2, so Even if it exists, since the behavior of the tower 5 and the behavior of the floating body 2 are integrated, the fixing work of the tower 5 can be performed easily and safely.

(4th procedure)
When the ballast water is removed from the floating body and the floating body 2 is floated, mooring lines 4, 4... Are installed on the floating body 2 (see FIG. 1).

  Alternatively, after floating the floating body 2, it may be towed to the installation location, and the mooring lines 4, 4, ... may be installed on the floating body at the installation location.

  The tower lifting equipment 9 may be left as it is or may be removed. When left, the large-scale repair can be performed at a lower cost by lowering the tower 5 with the left tower lifting / lowering equipment 9 at the time of future maintenance and repair. At this time, since the shaft structure 8 exists inside the floating body 2, the tower 5 can be lowered and raised easily and safely. In addition, what is necessary is just to make it install the said tower raising / lowering equipment 9 again at the time of large-scale repair when the said tower raising / lowering equipment 9 is removed.

[Other examples]
(1) In the above embodiment, the structure of the floating body 2 is a hybrid structure composed of the lower concrete floating body structure portion 2A and the upper steel floating body structure portion 2B, but all may be a concrete floating body structure. However, all may be a steel floating structure.

(2) In the above embodiment, the nacelle 6 and the wind turbine blades 7, 7... Are installed in stages before and after the tower 5 is pulled up. The three wind turbine blades may be attached in order after pulling up, or the nacelle 6 and the wind turbine blades 7, 7,...

(3) In the above embodiment, before the third procedure for joining the lower end of the tower 5 and the upper end of the floating body 2, the remaining one wind turbine blade 7 is attached, and all the wind turbine blades 7 are attached. However, after the third procedure of joining the lower end of the tower 5 and the upper end of the floating body 2, the remaining one wind turbine blade 7 may be attached.

(4) In the embodiment, the junction between the lower end of the tower 5 and the upper part of the floating body 2 has a frustoconical shape in which the diameter of the upper end is smaller than the diameter of the lower end as shown in FIG. Although the ring-shaped member is joined by the joining member 36 that can be divided in the circumferential direction, both may be joined by a flat ring-shaped member. These ring-shaped members have a structure that can be divided in the circumferential direction so that the joining member 36 can be attached while the shaft structure 8 is attached, but the tower 5 and the shaft structure 8 are separated from each other. Both are temporarily supported and inserted, a ring-shaped member continuous in the circumferential direction is inserted between the tower 5 and the floating body 2, and the tower 5 and the floating body 2 are inserted through the ring-shaped member continuous in the circumferential direction. May be joined together.

  DESCRIPTION OF SYMBOLS 1 ... Offshore wind power generation equipment, 2 ... Floating body, 3 ... Deck, 4 ... Mooring line, 5 ... Tower, 6 ... Nacelle, 7 ... Windmill blade, 8 ... Shaft structure, 9 ... Tower raising / lowering equipment, 30 ... Guide rail, 31 ... Bracket, 32 ... Center hole jack, 33 ... PC cable, 34 ... Electric pump unit

Claims (8)

It consists of a floating body, a mooring line, a tower, a nacelle and a plurality of wind turbine blades installed at the top of the tower, and the floating body has a spar-type floating body structure having a bottomed hollow portion with an open upper end, In the offshore wind power generation facility in which the tower can be accommodated entirely or most of the lower end side inside the floating body, and the tower can be raised and lowered by the tower lifting equipment,
Offshore wind power generation characterized in that a shaft structure is integrally provided continuously at the lower end of the tower, and the shaft structure is guided in vertical movement by a guide member provided inside the floating body. Facility.   The offshore wind power generation facility according to claim 1, wherein the shaft structure is a frame structure or a tubular structure.   The offshore wind power generation facility according to claim 1, wherein a joint portion between the lower end of the tower and the upper end of the floating body is joined by a ring-shaped member.   The offshore wind power generation facility according to claim 3, wherein the ring-shaped member is separable in the circumferential direction.   The offshore wind power generation facility according to any one of claims 1 to 4, wherein an electrical facility is provided inside the floating body, and the electrical facility is disposed around a center portion where the tower and the shaft structure are disposed.   The tower lifting and lowering equipment includes a plurality of jacks arranged evenly in a circumferential direction on a deck provided at an upper part of a floating body, and one end connected to the lower end of the shaft structure and the other end connected to the jack. The offshore wind power generation facility according to claim 1, comprising a cable. A construction method for installing the offshore wind power generation facility according to any one of claims 1 to 6,
On the ocean, the floating body is in an upright state, the shaft structure is accommodated inside the floating body, the tower is connected to the upper portion of the shaft structure, and the upper portion of the tower is connected to the upper end of the floating body. And a first procedure that also projects
A second procedure of installing at least a nacelle at the top of the tower by a hoist ship;
The construction method of the offshore wind power generation system characterized by including the 3rd procedure which pulls up the said tower to a regular height position with the said tower raising / lowering equipment, and couple | bonds the lower end of a tower and the upper end of the said floating body.   The construction method of the offshore wind power generation facility according to claim 7, wherein the attachment of the windmill blade is performed stepwise or in a lump within a period from the second procedure to the end of the third procedure.

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