JP4401703B2 - Installation method of offshore wind turbine generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a foundation structure and installation method for a bottomed offshore wind power generator installed in a so-called shallow water depth, and a relatively deep water depth (for example, a depth of about 10 to 30 m), and a relatively deep water depth (for example, In other words, the present invention relates to a foundation structure and an installation method of a floating offshore wind turbine generator installed at a so-called large water depth.
[0002]
[Prior art]
In recent years, environmental problems on the earth have been greatly highlighted, and wind power generation has attracted worldwide attention as a clean natural energy and has been put to practical use mainly in European countries.
[0003]
On the other hand, even in Japan, wind power generation has been put into practical use in various places, but until now all wind turbines have been installed on land. However, in order to expand wind power generation in Japan, it is inevitably necessary to move from land to offshore in consideration of geographical conditions.
[0004]
By the way, as the installation position of the offshore wind power generation, a sea area with a relatively shallow water depth in the coastal area and a sea area with a relatively deep water depth in the open sea are considered. For example, as shown in FIG. 20, as an installation method for shallow water depth, it has a column support 7 fixed in the center of the interior, and after the bottom is reached, the caisson 3 and the wave-dissipating block 4 are laid around it. It is known (for example, refer to Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-206474 (pages 2 to 4, FIG. 5)
[0006]
[Problems to be solved by the invention]
However, the above-described bottomed offshore wind power generator is installed on the ground (in order to place the wave-dissipating blocks 4 one by one on the surface of the caisson 3 where the wave-dissipating blocks are loaded, after landing on the seabed. Installation work at the site may be prolonged.
[0007]
In addition, the floating body construction method can be considered as an installation method for deep water, but there is a possibility that the installation work at the site may be further prolonged due to the severe sea conditions at the site and the distance from the land. .
[0008]
The present invention has been made to eliminate such inconveniences, and its purpose is to shorten the installation work at the site, thereby reducing the installation work cost at the site. The object is to provide a foundation structure and installation method of a bottomed offshore wind power generator for shallow water depth and a foundation structure and installation method of a floating offshore wind power generator for deep water.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0010]
That is,
The method of installing a bottomed offshore wind power generator for shallow water according to the present invention includes: (a) a step of standing a cylindrical windmill foundation on a box-shaped floating body on land to form a foundation body; , (B) a step of temporarily mooring the foundation body on the sea, and (c) a step of forming an offshore wind power generator by mounting a windmill body comprising a column, a generator and a windmill on the windmill base portion of the foundation body. And (d) a step of towing the offshore wind power generator to a marine installation area by a pulling ship; and And (f) a method of installing a bottomed offshore wind power generator for shallow water, comprising a step of suspending the offshore wind power generator with a crane ship and installing the foundation main body on the seabed ground .
[0011]
Here, according to the present invention, concrete ballast is injected into the floating body or water ballast is injected into the floating body according to the state of the seabed ground .
[0012]
Moreover, the installation method of the floating offshore wind power generator for deep water of the present invention is as follows: (a) A semi-submersible type in which a cylindrical vertical buoyant body is erected on a box-shaped lower buoyant body at a factory. A step of forming a floating body, (b) a step of temporarily mooring the semi-submersible floating body on the sea, and (c) mounting a plurality of ropes on the semi-submersible floating body, and a lower end of each rope Attaching an anchor to the section; (d) mounting a wind turbine body comprising a column, a generator and a wind turbine on the vertical buoyancy body of the semi-submersible floating body to form an offshore wind power generator; and (e) A step of towing the offshore wind power generation apparatus to a setting sea area by a tug; (f) a process of unwinding the rope after reaching the installation sea area and landing an anchor on the sea floor; and (g) the rope. A step of lifting again by a predetermined length and fixing it to the semi-submersible floating body; and (h) loosening in the lower buoyancy body. Wherein by injection bets a method of installing a semi submersible type floating consisting step of holding the half-death state deepwater for floating offshore wind turbine generator.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(A) First, the basic structure and installation method of the bottomed offshore wind power generator for shallow water will be described.
[0017]
As shown in FIGS. 1 (a) and 1 (b), a box-shaped floating body 21 and a cylindrical windmill base portion 22 are manufactured using a steel plate, concrete, or the like at a factory (not shown). Next, as shown in FIG.1 (c), the cylindrical windmill base part 22 is made to stand on this box-shaped floating body 21, and the bottom type offshore wind power generator for the foundation main body 20, ie, shallow water depth, is used. Form the foundation structure.
[0018]
Thereafter, the support member 23 is applied obliquely between the box-shaped floating body 21 and the cylindrical windmill base portion 22 as necessary to enhance the support force of the cylindrical windmill base portion 22.
[0019]
Next, as shown in FIG. 2, the foundation main body 20 is temporarily moored on an outfitting quay (not shown).
[0020]
Next, as shown in FIG. 3, a bottomed offshore wind power generator 25 is formed by mounting the windmill body 24 on the cylindrical windmill foundation portion 22 of the foundation body 20 temporarily moored on the quay. .
[0021]
The windmill body 24 has a tapered hollow column 26 whose diameter gradually decreases from the trunk (root) to the tip (upper end), and a generator 27 provided on the top of the column 26, The wind turbine 29 is mounted on the rotating shaft 28 of the generator 27. As shown in FIG. 8, the windmill 29 includes a plurality of wing bodies 30 that are radially attached to the rotary shaft 28.
[0022]
Next, as shown in FIG. 4, the offshore wind power generator 25 is towed to the installation sea area by several tugboats 31.
[0023]
Next, as shown in FIG. 5, after arriving at a predetermined installation area D, the box-shaped floating body 21 is supported by several crane ships 32, and a pump is used in the box-shaped floating body 21. Sometimes water ballast (seawater) is injected.
[0024]
At that time, as shown in FIG. 6, the wire rope 35 of the crane ship 32 is fed out to secure the stability of the box-shaped floating body 21 and is installed on the seabed ground F preliminarily constructed on the seabed E. Thereafter, the wire rope 35 is removed from the box-shaped floating body 21, and the offshore wind power generator 25 is made to stand on the seabed ground F as shown in FIGS. Thereafter, the internal water ballast is replaced with a fixed ballast such as concrete. Note that a power distribution cable (not shown) or the like is connected in advance to a connection terminal (not shown).
[0025]
In this embodiment, the concrete ballast is finally injected into the box-shaped floating body 21. However, it is possible to adjust the internal ballast amount and adjust the ground installation pressure. For example, in the case of sand ground G with a soft seabed, about half of the concrete ballast b is finally poured into the box-shaped floating body 21 as shown in FIG. When the seabed is soft ground H, the minimum required amount of water ballast a is injected into the box-shaped floating body 21 as shown in FIG.
[0026]
In addition, when the seabed is soft sand ground G or soft ground H, a large number of stopper piles 36 that sink under their own weight may be attached to the lower surface of the box-shaped floating body 21.
(B) Next, the basic structure and installation method of the floating offshore wind turbine generator for deep water will be described.
[0027]
As shown in FIG. 10, first, a semi-submersible (semi-sub) floating body 41, that is, a foundation structure of a floating offshore wind turbine for deep water is manufactured at a factory (not shown). The floating body 41 is formed by a polygonal box-shaped lower buoyancy body 42 and a cylindrical vertical buoyancy body 43. These buoyancy bodies 42 and 43 are manufactured using a steel plate or the like.
[0028]
Next, as shown in FIG. 11, this semi-submersible floating body 41 is temporarily moored on a quay quay (not shown).
[0029]
Next, as shown in FIG. 12, a rope 45 such as a chain is inserted into a plurality of guide pipes 44 provided along the edge of the lower buoyant body 42 of the floating body, and a lid-free box-like shape is formed at the lower end thereof. A sinker mold 46 is attached.
[0030]
Next, as shown in FIG. 13, concrete c is placed in the sinker mold 46 underwater. This underwater placement of concrete is performed using a concrete placement machine (not shown) installed on the above-mentioned quay wall.
[0031]
Next, as shown in FIG. 14, the semi-sub-type offshore wind power generator 47 is formed by mounting the windmill body 24 on the vertical buoyancy body 43 of the floating body 41 temporarily moored on the outfitting quay.
[0032]
The wind turbine body 24 includes a tapered hollow column 26 having a diameter that gradually decreases from the trunk (base) to the tip (upper end), and a generator 27 provided on the top of the column 26. The wind turbine 29 is mounted on the rotary shaft 28 of the generator 27. As shown in FIG. 19, the wind turbine 29 is composed of a plurality of wing bodies 30 that are radially attached to the rotary shaft 28.
[0033]
Next, as shown in FIG. 15, the semi-submersible offshore wind power generator 47 is towed to a predetermined installation area by several tugboats 31.
[0034]
Next, as shown in FIG. 16, after arriving at the predetermined installation sea area D, the semi-submersible offshore wind power generator 47 is mounted on the edge of the box-shaped lower buoyant body 42 while being supported by several crane ships 32. The rope 45 such as the chain that has been let out is fed out to bring the sinker 48 into contact with the seabed E.
[0035]
Next, as shown in FIG. 17, after the slack of the rope 45 such as a chain is removed, the rope 45 is lifted by a predetermined length and fixed to the lower buoyancy body 42.
[0036]
Next, as shown in FIGS. 18 and 19, water ballast (seawater) is poured into the lower buoyancy body 42 to fix the sinker 48 to the seabed E, and the tension of the rope is adjusted. At this time, since a part (upper part) of the vertical buoyancy body 43 of the floating body 41 protrudes upward from the sea level J, the floating body 21 is a semi-submersible type, that is, a semi-sub type. Note that a power distribution cable (not shown) or the like is connected in advance to a connection terminal (not shown).
[0037]
【The invention's effect】
As described above, the foundation structure of the bottomed offshore wind power generator for shallow water according to the present invention is a box-shaped floating body in which a cylindrical windmill foundation is erected and is attached to the bottom of the sea. Therefore, it can be reliably installed in a stable state on the seabed ground. In addition, since a large number of stopper piles are attached to the lower surface of the box-type floating body, the stability of the foundation structure is significantly improved by biting the stopper piles into the seabed ground.
[0038]
Moreover, the installation method of the bottomed offshore wind power generator for shallow water depth of this invention is (a) On the land, a cylindrical windmill base part is erected on a box-shaped floating body, and a foundation main body is formed. And (b) a step of temporarily mooring the foundation main body on the sea, and (c) an offshore wind power generator is formed by mounting a windmill main body comprising a prop, a generator and a windmill on the windmill base portion of the foundation main body. And (d) a step of towing the offshore wind power generation device to a marine installation area by a pulling ship, and (e) a strength of the seabed ground in the floating body while supporting the offshore wind power generation device by a crane ship. A step of injecting ballast; and (f) a step of suspending the offshore wind power generator with a crane ship and installing the foundation body on the submarine ground.
[0039]
Therefore, according to the present invention, a cylindrical windmill foundation is erected on a box-type floating body at a factory to integrally manufacture the foundation body, and then the windmill body is mounted in the factory during temporary mooring, The main task is to inject the ballast suitable for the strength of the seabed ground into the floating body, so the construction period at the site can be shortened and the construction cost can be reduced. Moreover, this invention can adjust a bottom face structure and the amount of ballasts according to the condition of a seabed ground.
[0040]
On the other hand, the basic structure of the floating offshore wind power generator for deep water according to the present invention is a semi-submersible type as described above in which a cylindrical vertical buoyant body is erected on a polygonal box-shaped lower buoyant body. Since the foundation body is formed by tensioning the floating body, the structure is very simple and the water line area is very small, so that there is an advantage that it is not easily affected by waves.
[0041]
Moreover, the installation method of the floating offshore wind turbine generator for deep water according to the present invention includes: (a) a semi-submersible type in which a cylindrical vertical buoyant body is erected on a box-shaped lower buoyant body at a factory; A step of forming a floating body, (b) a step of temporarily mooring the semi-submersible floating body on the sea, and (c) mounting a plurality of ropes on the semi-submersible floating body, and a lower end of each rope Attaching an anchor to the section; (d) forming an offshore wind power generator by mounting a windmill body comprising a support, a generator and a windmill on the vertical buoyancy body of the semi-submersible floating body; and (e) A step of towing the offshore wind power generation apparatus to a setting sea area by a tug; (f) a process of unwinding the rope after reaching the installation sea area and landing an anchor on the sea floor; and (g) the rope. A step of lifting again by a predetermined length and fixing to the semi-submersible floating body; and (h) in the lower buoyancy body. Is constituted by step by water injection to the last holding said semi-submersible-type floating semi death state.
[0042]
Therefore, according to this invention, since there is almost no rolling of a floating body, the fall of a windmill performance can be suppressed. In the present invention, the floating body has a simple structure, is easy to manufacture, and measures for anticorrosion are easy to measure. Moreover, since the semi-submersible floating body is integrally manufactured and the wind turbine body is mounted at the factory, the local construction period can be shortened, and the construction cost can be reduced. In addition, the present invention can re-float by adjusting the seawater ballast, and is excellent in maintainability.
[Brief description of the drawings]
1A is a side view of a floating body, FIG. 1B is a side view of a base portion, and FIG. 1C is a side view of a base body.
FIG. 2 is a side view of the foundation body during temporary mooring.
FIG. 3 is a side view of a wind turbine mounted on a basic body.
FIG. 4 is a side view of a bottomed offshore wind power generator during towing.
FIG. 5 is an explanatory diagram for injecting water ballast (seawater) into a floating body.
FIG. 6 is an explanatory view of holding an offshore wind power generator by a crane ship and bottoming it.
FIG. 7 is a side view of a self-supporting bottomed offshore wind power generator.
FIG. 8 is a front view of a self-supporting bottomed offshore wind power generator.
FIGS. 9A and 9B are explanatory views of a bottom structure and ballast adjustment according to ground conditions. FIGS.
FIG. 10 is a side view of a floating body.
FIG. 11 is a side view of a floating body during temporary mooring.
FIG. 12 is a side view in which a chain is mounted on a floating body.
FIG. 13 is an explanatory diagram in which a concrete is injected into a sinker frame.
FIG. 14 is a side view of the foundation body during temporary mooring.
FIG. 15 is a side view of a semi-sub-type offshore wind power generator during towing.
FIG. 16 is an explanatory diagram in which a sinker is attached to the seabed.
FIG. 17 is an explanatory diagram in which the sinker is lifted to a predetermined height.
FIG. 18 is an explanatory diagram in which the sinker is again bottomed on the seabed.
FIG. 19 is a front view of a self-supporting semi-subtype offshore wind power generator.
FIG. 20 is an explanatory diagram of a conventional offshore wind power generator.
[Explanation of symbols]
D Installation sea area 20 Foundation body 21 Floating body 22 Windmill foundation 25 Wind power generator 26 Prop 27 Generator 28 Windmill 29 Windmill body 31 Tug ship 32 Crane ship

Claims (4)

A method of installing a bottomed offshore wind power generator for shallow water,
(A) On land, a step of standing a cylindrical windmill foundation on a box-shaped floating body to form a foundation body;
(B) temporarily mooring the foundation body on the sea;
(C) a step of forming an offshore wind power generator by mounting a windmill body comprising a prop, a generator, and a windmill on the windmill foundation of the foundation body;
(D) a step of towing the offshore wind power generation device to an installation sea area by a tug;
(E) injecting ballast corresponding to the strength of the seabed ground into the floating body while supporting the offshore wind power generator with a crane ship;
(F) A method for installing a bottomed offshore wind power generator for shallow water, comprising a step of suspending the offshore wind power generator with a crane ship and installing the foundation body on the seabed ground. Installation of shallow depth for Chakusokoshiki offshore wind turbine generator according to claim 1, wherein the injecting concrete ballast the floating body within. Installation of shallow depth for Chakusokoshiki offshore wind turbine generator according to claim 1, wherein the injecting water ballast into the floating body within. A method for installing a floating offshore wind turbine generator for deep water,
(A) a step of standing a cylindrical vertical buoyant body on a box-shaped lower buoyant body at a factory to form a semi-submersible floating body;
(B) temporarily mooring the semi-submersible float on the sea;
(C) mounting a plurality of ropes on the semi-submersible floating body, and attaching an anchor to the lower end of each rope;
(D) A step of forming an offshore wind power generator by mounting a windmill body comprising a column, a generator and a windmill on the vertical buoyancy body of the semi-submersible floating body;
(E) a step of towing the offshore wind power generation apparatus to a setting sea area by a tug;
(F) After arriving at the installation sea area, the step of extending the rope and landing the anchor on the seabed;
(G) a step of lifting the rope again by a predetermined length and fixing it to the semi-submersible floating body;
(H) A method for installing a floating offshore wind power generator for deep water, comprising a step of pouring ballast into the lower buoyancy body to hold the semi-submersible floating body in a semi-submerged state.

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