JP2023170587A - Spar type floating body and assembly method for ocean wind power generation facility - Google Patents

Abstract

To solve a problem in prior art, that is, to provide a spar type floating body capable of suppressing rolling and pitching when utilized as well as at assembly and an assembly method for an ocean wind power generation facility using the same.SOLUTION: The spar type floating body of an ocean wind power generation facility in which a wind mill power unit is installed on ocean includes a hollow pillar state body, a cell for storing weight material, and ejection means. In addition, the cell is provided inside the pillar state body and the ejection means is means to eject the weight material stored in the cell. Then, the weight material is ejected from the cell by operating the ejection means.SELECTED DRAWING: Figure 1

Description

The present invention relates to an offshore wind power generation facility, and more specifically, a spar-type floating body that can suppress the oscillation of the offshore wind power generation facility not only during operation but also during the construction stage during the completion of the facility; The present invention relates to a method of assembling an offshore wind power generation facility using this.

Although electricity consumption in Japan temporarily began to decline due to the effects of the global financial crisis in 2008, it has continued to increase since the oil crisis in 1973, and between 1973 and 2007, It has expanded to 2.6 times. The reasons behind this include the spread of so-called home appliances such as air conditioners and electric carpets as living standards improve, and the spread of office automation (OA) equipment and communication equipment as the number of office buildings increases.

Up until now, the huge demand for electricity has been mainly supported by power generation using so-called fossil fuels such as oil and coal. However, in recent years, the depletion of fossil fuels and environmental problems associated with global warming have attracted attention, and power generation methods have gradually changed in response. As a result, while around 1973, as mentioned earlier, oil and coal-based power generation accounted for approximately 90% of the total power generation, by 2010 that proportion had decreased to 66%. Instead, nuclear power generation, which accounted for just over 10% of the total (in 2010), has increased. Nuclear power generation has a significant effect on reducing greenhouse gas emissions compared to conventional power generation methods, and because it can provide electricity at low cost, it has greatly contributed to Japan's electricity demand.

Furthermore, power generation methods using renewable energy are increasingly being adopted because they can reduce greenhouse gas emissions. This renewable energy is energy that can literally be regenerated, such as sunlight, wind, geothermal, small and medium-sized hydropower, and woody biomass.It is a promising low-carbon energy source because it reduces greenhouse gas emissions and can be produced domestically. It is expected.

Among renewable energies, power generation methods that use wind power in particular have the advantage of high conversion efficiency of electrical energy. In general, the conversion efficiency of solar power generation is said to be about 20%, woody biomass power generation is about 20%, geothermal power generation is 10-20%, while wind power generation is said to be 20-40%. , can convert energy into electricity with higher efficiency than other power generation methods. Another feature of wind power generation is that, unlike solar power generation, it can generate electricity day and night. Due to these features, wind power generation is already widely used as a major power generation method in Europe, and in Japan, it is expected to account for 1.7% of the power source mix in 2030 in efforts to improve the energy mix. We aim to take on the role of

Wind power generation is broadly divided into onshore wind power generation and offshore wind power generation, depending on the installation location.Of these, onshore wind power generation has the advantage of being easier to install than offshore wind power generation, and therefore can reduce costs. . On the other hand, offshore wind power generation does not suffer from the noise problems that land-based wind power generation has, it also avoids the risk of damage from falls, etc., and above all, it has the advantage of being able to stably obtain a large amount of wind power compared to land-based wind power generation. We are prepared. Japan, which has the world's sixth largest exclusive economic zone, is a suitable location for offshore wind power generation, and is thought to have the potential to become a promising source of renewable energy in the future.

In addition, different types of offshore wind power generation are adopted depending on the installation location, with fixed offshore wind power generation being suitable for waters shallower than 50 meters, and floating offshore wind power generation being suitable for waters deeper than 50 meters. . Among these, floating offshore wind power generation uses floating bodies floating in seawater, and is a method in which a power generation mechanism is installed on the floating body connected with mooring ropes, and the power generation mechanism generates electricity. Examples of floating body types include barge type, semi-sub type, spar type, and tension leg platform (TLP) type. Among these, spar-type offshore wind power generation facilities can reduce the labor involved in manufacturing because the structure of the floating body (hereinafter referred to as "spar-type floating body") is not so complicated, and the spar-type floating body is lightweight. Therefore, the material cost can be reduced, and it is considered advantageous in terms of floating body manufacturing costs.

FIG. 8 is a side view schematically showing a spar type offshore wind power generation facility. As shown in this figure, a spar-type offshore wind power generation facility consists of a spar-type floating body floating in the sea, and a tower, rotor, nacelle, etc. installed on top of it (hereinafter collectively referred to as the "wind turbine section"). It consists of: The tower is a structure that supports the rotor and nacelle, and a spar-type floating body serves as the foundation of the tower. The rotor, which consists of blades and a hub, converts the wind into power, and the nacelle, which includes a speed increaser, generator, and transformer, converts the power into electricity, which is then transmitted through power cables (dynamic cables and submarine cables). This means that electricity is transmitted to land areas. Note that spar-type floating bodies are generally moored by the weight of catenary-shaped mooring lines.

The main body part of the spar-type floating body is a so-called elongated body whose dimension in the axis (hereinafter referred to as "column axis") direction is superior to its cross-sectional dimension, and it has a tubular shape with a hollow interior. . As shown in FIG. 8, during operation, the spar type floating body is in a state in which its column axis direction is approximately vertical (including vertical) (hereinafter referred to as "upright state"). Since a spar-type floating body in an upright state is likely to suffer from fluctuations such as pitching or rolling, various techniques have been proposed to suppress such fluctuations. For example, Patent Document 1 proposes a technique for suppressing oscillation by using an annular member that functions as a so-called "floating ring", that is, by connecting the annular members arranged so as to surround the floating body part with ropes, etc. are doing.

Japanese Patent Application Publication No. 2013-141857

Normally, spar-type floating bodies are manufactured on land, such as in a dry dock, so they need to be transported by sea to the operation site (wind farm: WF). At this time, the spar type floating body is transported in a state where the column axis direction is approximately horizontal as shown in FIG. 9(a). Therefore, in order to bring it into operation, it is necessary to rotate the spar type floating body from a substantially horizontal state to an upright state (hereinafter referred to as "standing up") as shown in FIG. 9(b). However, since wind farms are expected to receive considerable wind force, it is not an appropriate place to erect a spar-type floating structure, so it will be erected in a pre-selected calm area at sea. In addition, the wind turbine part (tower, rotor, nacelle, etc.) is manufactured separately from the spar-type floating body and transported to a calm area, and is then erected using a hoist boat or the like as shown in Figure 9 (c). will be installed. The nearly completed structure of the offshore wind power generation facility is then transported to the wind farm in an operational state (that is, with the spar-shaped floating structure in an upright position).

Since a spar-type offshore wind power generation facility is assembled using the above-mentioned procedure, the structure shown in Fig. 10(b), albeit temporarily, is required before the completed structure with the wind turbine section attached as shown in Fig. 10(a) is completed. As shown, a spar-type floating body without a wind turbine attached will be placed on the ocean. In other words, the wind turbine section is installed on the spar type floating body in the state shown in FIG. 10(b). For convenience, the spar-type floating body in the state shown in FIG. 10(b) will be referred to as "the spar-type floating body at the time of assembly."

As mentioned above, since a spar type floating body in an upright state tends to sway, various techniques have been adopted to suppress the sway. However, all of the conventional technologies suppress the movement of the spar type floating body during operation, that is, the technology suppresses the movement of the spar type floating body to which the wind turbine section is attached. 10(b)). Since the spar-type floating body in operation has a wind turbine section on the top, the center of gravity is higher than the spar-type floating body when assembled, and the natural period of the floating body's oscillation is longer. On the other hand, since the spar type floating body does not have a wind turbine section when assembled, its center of gravity is low and its natural period is short. Figure 11(a) is a graph showing the wave spectra during normal sea conditions and storm winds, and Figure 11(b) is a graph showing wave spectra during normal sea conditions and storm winds. FIG. 2 is a graph diagram showing a frequency response function (RAO: Response Amplitude Operator) representing the oscillation characteristics of a spar type floating body. Note that the wave spectrum indicates the amount of energy of a sine wave for each frequency when an irregular wave is expressed as a superposition of countless sine waves. As shown in this figure, the oscillation characteristics of a spar type floating body during operation have a long natural period, so the response peak is at a long period position, and the oscillation does not interfere much with the wave spectrum during normal sea conditions and storms. It can be seen that this is suppressed. On the other hand, the oscillation characteristics of a spar type floating body during assembly are such that the natural period is short, so the response peak is at a short period position, and it is likely to oscillate because it interferes greatly with the wave spectrum of the normal sea state. It can be seen that synchronized swings are likely to occur.

Naturally, to install a wind turbine on a spar-type floating structure, normal sea conditions are chosen to avoid stormy winds. However, as shown in FIG. 11, the spar type floating body when assembled is likely to sway even under normal sea conditions. Therefore, installation of the wind turbine must be carried out under normal sea conditions and in calm conditions. As a result, the operational efficiency of installation work was severely limited by ocean conditions, and the sway of the spar-type floating body during assembly increased construction costs.

An object of the present invention is to solve the problems faced by the prior art, namely, to provide a spar-type floating body that can suppress vibrations not only during operation but also during assembly, and a method for assembling an offshore wind power generation facility using the same. It is to be.

The present invention is characterized in that a compartment for storing a weight material (ballast, etc.) is provided in a hollow columnar main body, and the weight material is stored in the compartment during assembly, but the weight material is discharged from the compartment during operation. This was done with a focus on this, and was based on an idea that had never been seen before.

The spar-type floating body of the present invention is a spar-type floating body for an offshore wind power generation facility in which a wind turbine section is installed offshore, and is equipped with a hollow columnar body, a compartment for accommodating a weight material, and a discharge means. . Note that the compartment is provided inside the columnar main body, and is a means for discharging the weight material housed in the compartment by operating the discharging means. Then, the weight material is discharged from the compartment by operating the discharge means.

The spar type floating body of the present invention can also be configured with two or more horizontally divided compartments arranged along the inner circumferential surface of the columnar main body. In this case, the discharge means can discharge the weight material independently for each horizontally divided compartment.

The spar type floating body of the present invention can also be configured with two or more vertically divided compartments arranged along the axial direction of the columnar body. In this case, the discharge means can discharge the weight material independently for each vertically divided compartment.

In the spar type floating body of the present invention, the columnar body is in a substantially upright (including upright) posture, and when the wind turbine section is installed, the compartment is provided at the planned water line position of the columnar body. You can also.

The method for assembling an offshore wind power generation facility of the present invention is a method for assembling an offshore wind power generation facility by installing a wind turbine section on the spar type floating body of the present invention on the ocean, which includes a main body erection step, a weight material insertion step, and a wind turbine section installation step. This method includes a process and a weight material discharge process. In the main body raising process, a weight material for the bottom is placed at the bottom of the columnar body to make the columnar body approximately upright (including upright), and in the weight material injection process, the weight material is placed inside the compartment. do. In addition, in the wind turbine part installation process, the wind turbine part is installed on a spar type floating body that is approximately upright (including upright) on the ocean, and in the weight material discharge process, the weight material is discharged from the compartment by operating a discharge means. .

The method for assembling an offshore wind power generation facility according to the present invention may further include an attitude adjustment step. In this case, it is preferable to use a spar type floating body in which the compartment is composed of two or more horizontally divided compartments. In this attitude adjustment step, when the columnar body is tilted after the weight material input step, weight material is additionally introduced into a predetermined divided compartment (or the weight material in a predetermined divided compartment is discharged) By doing so, the columnar body is placed in a substantially upright (including upright) posture.

The spar type floating body and offshore wind power generation facility assembly method of the present invention have the following effects.
(1) The oscillation of the spar type floating body is suppressed not only during operation but also during assembly (when installing the wind turbine section). As a result, compared to the conventional technology, the operating rate of installation work is improved, that is, construction costs can be reduced.
(2) By providing the compartment at the planned waterline position of the columnar body, this compartment can be used as a structure for stability in the event of damage, and also as a stiffener against external forces that tend to occur near the waterline. It can also be expected as
(3) By configuring a compartment with two or more horizontally divided compartments, when the columnar body is tilted, it can be corrected to a substantially upright (including upright) posture.

FIG. 1 is a side view schematically showing a spar type floating body of the present invention. (a) is a perspective view schematically showing a spar type floating body of the present invention, and (b) is a sectional view cut along a vertical plane schematically showing the spar type floating body of the present invention. (a) is a graph showing the wave spectrum during normal sea conditions and stormy winds, and (b) is a graph showing the spar type during assembly (installation of the wind turbine section) and during operation when the spar type floating body of the present invention is adopted. A graph diagram showing a frequency response function representing the motion characteristics of a floating body. (a) is a perspective view schematically showing a spar-type floating body without a lifting means, and (b) is a cross-sectional view cut along a vertical plane, schematically showing a spar-type floating body without a lifting means. (a) is a plan view schematically showing a compartment made up of eight horizontally divided compartments, and (b) is a side view schematically showing a compartment made up of three vertically divided compartments. FIG. 2 is a flow diagram showing the main steps of the method for assembling an offshore wind power generation facility according to the present invention. FIG. 3 is a step diagram showing the main steps of the method for assembling an offshore wind power generation facility of the present invention. A side view schematically showing a spar-type offshore wind power generation facility. A step diagram schematically showing how to assemble a spar-type offshore wind power generation facility offshore. (a) is a side view schematically showing a spar type floating body to which a wind turbine section is attached, and (b) is a side view schematically showing the spar type floating body before the wind turbine section is attached. (a) is a graph showing "wave spectra during normal sea conditions and storms", (b) is a graph showing "sway characteristics of a spar-type floating body during assembly (installation of the wind turbine) and during operation" when conventional technology is adopted. A graph diagram showing the frequency response function representing the frequency response function.

An example of an embodiment of a spar type floating body and a method for assembling an offshore wind power generation facility of the present invention will be described based on the drawings.

1. Spar Type Floating Body First, the spar type floating body of the present invention will be explained. The offshore wind power generation facility assembly method of the present invention is a method for assembling an offshore wind power generation facility including the spar-type floating body of the present invention, so the spar-type floating body of the present invention will be explained first, and then the offshore wind power generation facility of the present invention will be explained. The method for assembling the power generation facility will be explained in detail.

FIG. 1 is a side view schematically showing a spar type floating body 100 of the present invention. As shown in this figure, the spar type floating body 100 of the present invention includes a columnar main body 110, a compartment 120, and a discharge means 130, and may also include a discharge pipe, etc., which will be described later. Then, when a wind turbine section (tower, rotor, nacelle, etc.) is installed on the spar-type floating body 100 that is in an upright state, a spar-type offshore wind power generation facility is completed. Each of the main elements constituting the columnar floating body 100 will be explained below.

(columnar body)
As shown in FIG. 1, the column main body 110 is a long body whose axial dimension is superior to its cross-sectional dimension, and its interior is hollow. The pillar body 110 is a so-called bottomed open tube with one end (the lower end in the figure) closed and the other end (the upper end in the figure) open, and it can also have a cylindrical shape with a circular cross section. It can also be made into a polygonal prism shape. Furthermore, as shown in FIG. 1, a diameter-reduced portion may be formed in the upper part of the column main body 110. This reduced diameter portion is a portion to which the towers are connected, and is a so-called adjustment section for changing from the large diameter of the column main body 110 to the small diameter of the tower. In this figure, the reduced diameter portion is formed at only one location, but the diameter reduction portion is not limited to this, and the reduced diameter portion may be formed at two or more locations.

(Separate room)
The compartment 120 is provided inside the columnar body 110 as shown in FIG. 2, above the spar type floating body 100 that is in an upright state as shown in FIG. 1, and accommodates a "weight material" inside. It is a box with a space where it can be used. Here, the "weight material" refers to various heavy objects such as ballast such as seawater or crushed stone, and solid weights (so-called counterweights). In addition, in order to distinguish it from the weight material that is put into the bottom part when raising the spar type floating body 100, for convenience, the weight material accommodated in the compartment 120 will be particularly referred to as "compartment weight material BLr" and the bottom part. The weight material to be put in is particularly referred to as "bottom weight material BLb."

In the case of the prior art, a spar type floating body without a wind turbine section on its upper part (that is, when assembled) has a low center of gravity and is prone to sway in synchronization with waves, so it is likely to oscillate. On the other hand, in the case of the present invention, the compartment 120 is provided above the spar type floating body 100 that is in an upright state, and the compartment weight material BLr can be accommodated in the compartment 120. Compared to other buildings, the center of gravity can be placed at a higher position, making it less likely to sway in sync with the waves, thereby suppressing sway. FIG. 3(a) is a graph showing "wave spectra during normal sea conditions and storms", and FIG. 3(b) is a graph showing "the wave spectrum during assembly and operation" when the spar-type floating structure of the present invention is adopted. It is a graph diagram showing "RAO". As shown in this figure, the oscillation characteristics of the spar type floating body during assembly do not interfere with the wave spectrum of normal sea conditions compared to the conventional technology (FIG. 11), so it can be seen that the oscillation is suppressed.

Although it has been explained that the compartment 120 is provided above the spar type floating body 100 that is in an upright state, it is preferable that the compartment 120 is provided around the "planned waterline position". Here, the "planned waterline position" is the position (height) of the spar-type floating body 100 that intersects with the seawater level when the spar-type offshore wind power generation facility is completed (that is, when in operation). This planned water line position is also called a splash zone, and is an area where members are subject to severe fatigue due to external forces such as waves. Therefore, the fatigue of the member is alleviated by installing the compartment 120 at the planned water line position and increasing the rigidity (secondary moment of area, etc.) of the part. In addition, if it can be arranged to include the planned water line position, the length of the compartment 120 that protrudes into the air (that is, the length from the planned water line position to the upper end of the compartment 120) and the compartment that sinks into the sea. The length of the chamber 120 (that is, the length from the planned water line position to the lower end of the compartment 120) can be designed with a desired value.

Moreover, if the compartment 120 is installed at the planned water line position, the requirements for stability in the event of damage can also be satisfied. If a part of the floating body is damaged, seawater will seep into the interior, so conventionally it was considered to wrap fender material around the planned waterline, where damage is likely to occur due to collisions with other ships. As will be described later, during operation, the compartment weight material BLr has already been discharged from the compartment 120. Therefore, if the compartment 120 is installed at the planned water line position, even if a part of the spar type floating body 100 is damaged, seawater will only infiltrate into the compartment 120, and as a result, the seawater will enter the inside of the spar type floating body 100. can prevent large amounts of seawater from entering. In this case, in order to prevent the seawater that has entered the compartment 120 from leaking into the spar type floating body 100, the compartment 120 may have a sealed (particularly watertight) structure with a top plate. In addition, the installation range of the compartment 120 (especially the range in the vertical direction) should preferably be arranged so as to cover the range up to 5 m above the planned water line and the range up to 3 m below, considering the damage range. Good. Further, when the compartment 120 is installed at the planned waterline position, it is not necessarily necessary to install a fender, but of course a fender can be installed.

The spar type floating body 100 of the present invention may be equipped with a lifting means for throwing the compartment weight BLr into the compartment 120, as shown in FIG. This lifting means 150 is arranged slightly above the compartment 120, and is capable of lifting and lowering the compartment weight BLr. For example, the lifting means 150 shown in FIG. 2 includes a ceiling beam 151, a hook 152, and a traction device such as a winch. As a result, when the winch winds up the wire rope, the compartment weight BLr is lifted together with the hook 152, and when the winch unwinds the wire rope, the compartment weight BLr is suspended together with the hook 152. Furthermore, when the hook 152 moves horizontally along the ceiling beam 151, the compartment weight BLr also moves horizontally. Note that as the weight material BLr for the compartment that is moved using the lifting means 150, it is preferable to use a solid weight (so-called counterweight), crushed stone packed in a bag, seawater stored in a container, or the like.

In addition to the lifting means 150, a temporary deck 160 can also be installed. This temporary deck 160 is arranged slightly above the compartment 120 and slightly below the lifting means 150 (that is, between the compartment 120 and the lifting means 150), and has a compartment weight BLr. It is a so-called storage shelf for placing items. In this case, the lifting means 150 lifts the weight material BLr for the compartment placed on the temporary deck 160, moves it horizontally to above the compartment 120, and then the lifting means 150 lifts the weight material BLr for the compartment. It can be suspended within the compartment 120. After the wind turbine section is installed on the upper part of the spar type floating body 100, the lifting means 150 lifts the compartment weight material BLr housed in the compartment 120, and the compartment weight material BLr is transferred to the spar type floating body. 100 (in some cases, the compartment weight material BLr can also be discharged using a discharge means 130, which will be described later). Note that the lifting means 150 can be configured to be remotely operated, or can be configured to be operated on-site (that is, at the installation location of the lifting means 150). However, if the configuration is such that remote operation is possible, it is desirable to also install a video camera to check the on-site situation. Further, without providing the temporary deck 160, the lifting means 150 can directly lift the compartment weight material BLr from, for example, a shipboard.

The spar-type floating body 100 of the present invention is not limited to one that includes the lifting means 150 and the temporary deck 160, but can also be one that does not include the lifting means 150 and the temporary deck 160 as shown in FIG. . FIG. 4 is a diagram schematically showing a spar type floating body 100 that does not include a lifting means 150 or the like, in which (a) is a perspective perspective view thereof, and (b) is a sectional view thereof. In this case, fluid ballast or granular ballast is suitable as the compartment weight BLr, and the compartment 120 in this case should have an open shape so that the compartment weight BLr can be easily inserted. Alternatively, the structure may include a top plate so that the compartment weight BLr contained therein is sealed (particularly watertight). When the compartment 120 is provided with a top plate, an injection pipe for injecting the compartment weight material BLr may be installed on the top plate, or the top plate may be configured to open and close.

(Discharge means)
When the wind turbine section is installed on the upper part of the spar type floating body 100 (that is, when in operation), its center of gravity is placed at a sufficiently high position, so that the compartment weight material BLr can be discharged from the compartment 120. . The discharge means 130 is a means for discharging the compartment weight material BLr accommodated in the compartment 120. However, the ejection means 130 can be operated by an operator located on land, on a ship, at another location inside the spar type floating body 100, or at a remote location such as a working platform provided outside the spar type floating body 100, that is, by remote control. is possible. In the example of FIG. 4, a valve that can be opened and closed by remote control is used as the discharge means 130, and the discharge means 130 is attached to a discharge pipe 140 communicating with the compartment 120. In this case, if the compartment weight BLr is a fluid or granular ballast, when the operator opens the discharge means 130 by remote control, the compartment weight BLr housed in the compartment 120 is discharged through the discharge pipe 140. If the spar type floating body 100 is in an upright state, the compartment weight BLr falls toward the bottom.

(divided compartment)
Although it has been described that the compartment 120 is a box provided inside the columnar main body 110 and has a space formed therein, it can be formed with one box or with a plurality of boxes. . In other words, the compartment 120 can be configured with a plurality of divided bodies (hereinafter referred to as "divided compartments"). For example, as shown in FIG. 5A, it can be configured by a plurality of divided compartments (hereinafter particularly referred to as "horizontal divided compartments 120H") arranged along the inner circumferential surface of the columnar main body 110. In this figure, the compartment 120 is composed of eight horizontally divided compartments 120H, but of course the compartment 120 is not limited to eight, and can also be composed of two or more horizontally divided compartments 120H. In this case, it is preferable to install a discharge means 130 as shown in FIG. 4, for example, in each horizontally divided compartment 120H. Thereby, the compartment weight material BLr can be accommodated in each horizontally divided compartment 120H, and the compartment weight material BLr can be discharged independently for each horizontally divided compartment 120H.

As described above, the spar type floating body 100 is transported with the column axis direction substantially horizontal, and is erected from the substantially horizontal state to an upright state in order to be put into operation. When the spar type floating body 100 is erected, the bottom weight material BLb is put into the bottom of the spar type floating body 100, but especially in the case where crushed stone is used as the bottom weight material BLb, the bottom weight material BLb accumulated at the bottom The upper surface of the weight material BLb may be inclined (that is, not horizontal), and as a result, the spar type floating body 100 may also be inclined (that is, not vertical). At this time, by using the plurality of horizontally divided compartments 120H, the attitude of the spar type floating body 100 can be adjusted relatively easily.

Specifically, after the spar type floating body 100 is erected, the weight material BLr for the compartment is put into each horizontally divided compartment 120H, but when the spar type floating body 100 is tilted, the appropriate horizontally divided After selecting the compartment 120H, more compartment weight BLr is put into the horizontally divided compartment 120H than the other compartments, and adjustment is made so that the spar type floating body 100 is approximately vertical (including the vertical). It is. Alternatively, after selecting an appropriate horizontally divided compartment 120H, the compartment weight BLr of the horizontally divided compartment 120H can be discharged to adjust the attitude of the spar type floating body 100. Furthermore, the attitude of the spar type floating body 100 is adjusted by installing a pumping device such as a submersible pump and moving the compartment weight material BLr housed in a predetermined horizontally divided compartment 120H to another horizontally divided compartment 120H. It is also possible to have a configuration in which:

The compartment 120 may be composed of a plurality of divided compartments (hereinafter particularly referred to as "vertical divided compartments 120V") arranged along the axial direction of the columnar main body 110, as shown in FIG. 5(b). can. In this figure, the compartment 120 is configured with three stages of vertically divided compartments 120V, but of course the compartment 120 is not limited to three stages, but may also be configured with two or more stages of vertically divided compartments 120V. can. Furthermore, each stage of vertically divided compartments 120V can be further configured with a plurality of horizontally divided compartments 120H. In addition, when the compartment 120 is composed of a plurality of vertically divided compartments 120V, a discharge means 130 as shown in FIG. 4 is installed in each vertically divided compartment 120V, and the upper vertically divided compartment 120V is It is preferable to adopt a configuration in which the compartment weight material BLr discharged from the chamber flows into the vertically divided compartment 120V immediately below (adjacent lower stage). Thereby, the compartment weight material BLr can be accommodated in each vertically divided compartment 120V, and the compartment weight material BLr can be discharged independently for each vertically divided compartment 120V.

(mobile compartment)
As mentioned above, it is desirable that the compartment 120 be arranged around the planned waterline position of the spar type floating body 100. However, even if the wind turbine section is placed in an upright position, the compartments 120 may not be placed around the planned water line position as planned. Therefore, it is preferable to configure the compartment 120 to slide up and down. Rails and guide grooves are provided on the inner periphery of the columnar main body 110, and the compartment 120 is slid up and down along the rails. In this case, as well as the discharge means 130, the compartment can be opened by an operator located on land, on a ship, at another location inside the spar type floating body 100, or at a remote location such as a working platform provided outside the spar type floating body 100. It is desirable to have a specification in which 120 can be slid up and down.

2. Offshore Wind Power Generation Facility Assembly Method Next, the offshore wind power generation facility assembly method of the present invention will be described in detail with reference to the drawings. The method for assembling an offshore wind power generation facility according to the present invention is a method for assembling an offshore wind power generation facility including the spar type floating body 100 described so far, and therefore, the explanation that overlaps with the content explained for the spar type floating body 100 is avoided, and the present invention Only the content specific to the offshore wind power generation facility assembly method of the invention will be explained. That is, the contents not described here are the same as those explained in "1. Spar type floating body".

FIG. 6 is a flow diagram showing the main steps of the offshore wind power generation facility assembly method of the present invention, and FIG. 7 is a step diagram showing the main steps of the offshore wind power generation facility assembly method of the present invention. When assembling a wind power generation facility including the spar type floating body 100 on the ocean, first, the spar type floating body 100 is transported by sea in a state where the column axis direction is approximately horizontal as shown in FIG. 7(a) (Step 201 in FIG. 6). . In order to ensure that the spar type floating body 100 has a certain degree of draft during transportation, it is preferable to place some bottom weight material BLb at the bottom of the spar type floating body 100. Note that, depending on the situation, some compartment weights BLr may be accommodated in the compartment 120 during transportation, or no compartment weights BLr may be accommodated.

When the spar type floating body 100 is transported to the selected calm area, the spar type floating body 100 is transferred to the bottom part of the spar type floating body 100 as shown in FIG. stand up so that it is in an upright state (Step 203 in FIG. 6). When the spar type floating body 100 is in an upright state, the weight material BLr for the compartment is introduced into the compartment 120 as shown in FIG. 7(c), and the center of gravity of the spar type floating body 100 is placed at a high position (Step 204 in ). At this time, if the spar type floating body 100 is inclined as shown in FIG. By discharging the compartment weight BLr from the compartment 120H, the spar type floating body 100 is adjusted to be approximately vertical (Step 205 in FIG. 6).

When the spar type floating body 100 is placed in an upright state and the weight material BLr for the compartment is put into the compartment 120, as shown in FIG. , and installed on the upper part of the spar type floating body 100 using a hoist (Step 206 in FIG. 6). Then, as shown in FIG. 7F, the compartment weight BLr accommodated in the compartment 120 is discharged and dropped to the bottom of the spar type floating body 100 (Step 207 in FIG. 6).

The spar-type floating body and offshore wind power generation facility assembly method of the present invention can be particularly suitably used for spar-type offshore wind power generation facilities in sea areas at depths of 50 m or deeper. According to the present invention, it is possible to install a spar-type offshore wind power generation facility at low cost and safely, so it is possible to expect more active motivation for offshore wind power generation, and in turn to reduce greenhouse gas emissions. In addition, considering the stable supply of energy, the present invention can be said to be an invention that can not only be used industrially but also can be expected to make a significant contribution to society.

100 Spar type floating body of the present invention 110 Column body (of the spar type floating body) 120 Compartment (of the spar type floating body) 120H Horizontal divided compartment (constituting the compartment) 120V Vertical divided compartment (constituting the compartment) 130 Discharge means (of the spar type floating body) 140 Discharge pipe (of the spar type floating body) 150 Lifting means (of the spar type floating body) 151 Ceiling beam (of the lifting means) 152 Hook (of the lifting means) 160 (of the spar type floating body) ) Temporary deck BLr Weight material for compartment BLb Weight material for bottom

Claims (6)

A spar type floating body for an offshore wind power generation facility in which a wind turbine section is installed offshore,
a hollow columnar body;
a compartment provided inside the columnar body and accommodating a weight material;
a discharge means for discharging the weight material housed in the compartment;
A spar type floating body characterized by: The compartment is composed of two or more horizontally divided compartments arranged along the inner peripheral surface of the columnar main body,
The discharge means discharges the weight material independently for each of the horizontally divided compartments,
The spar type floating body according to claim 1, characterized in that: The compartment is constituted by two or more vertically divided compartments arranged along the axial direction of the columnar body,
The ejection means independently ejects the weight material for each vertically divided compartment.
The spar type floating body according to claim 1 or claim 2, characterized in that: When the columnar body is in an upright or substantially upright position, and the wind turbine section is installed, the compartment is located at a planned water line position in the columnar body.
The spar type floating body according to claim 1 or claim 2, characterized in that: A method of assembling an offshore wind power generation facility by installing a wind turbine part on a spar type floating body at sea,
The spar type floating body has a hollow columnar body, a compartment provided inside the columnar body, and a discharge means,
a body raising step in which a bottom weight material is put into the bottom of the columnar body and the columnar body is placed in an upright or substantially upright position;
a weight material introduction step of introducing a weight material into the interior of the compartment;
a wind turbine part installation step of installing the wind turbine part on the spar type floating body at sea;
a weight material discharge step of discharging the weight material from the compartment by operating the discharge means;
An offshore wind power generation facility assembly method characterized by: The compartment is composed of two or more horizontally divided compartments arranged along the inner peripheral surface of the columnar main body,
The ejection means independently ejects the weight material for each horizontally divided compartment,
When the columnar main body is tilted after the weight material input step, by additionally introducing the weight material into a predetermined divided compartment, or by discharging the weight material from a predetermined divided compartment. , further comprising a posture adjustment step of setting the columnar body in an upright or substantially upright posture;
6. The method for assembling an offshore wind power generation facility according to claim 5.

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