JP7447695B2 - Column-shaped floating body and method for manufacturing column-shaped floating body - Google Patents

Description

The present invention relates to a columnar floating body constituting a floating offshore wind power generation facility, and more specifically relates to a columnar floating body having a column body having a polygonal cross-sectional shape and a method for manufacturing the same. .

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.

Until now, this 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 characteristics, wind power generation is already widely used as a main power generation method in Europe, and in Japan, it is expected to account for 1.7% of the power source mix in 2030 in the "energy mix" initiative. That's what I'm aiming for.

Wind power generation is broadly divided into onshore wind power generation and offshore wind power generation, depending on its 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 occur with onshore wind power generation, it also avoids the risk of damage caused by falls, and above all, it has the advantage of being able to stably obtain a large amount of wind power compared to onshore wind power generation. We are prepared. Japan, which has the world's sixth largest exclusive economic zone, is a suitable location for floating 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. Floating structure types include pontoon type (barge type), semi-sub type, spar type (column type), tension mooring type (TLP), etc. In offshore areas, there is a tendency for the columnar type to be mainly adopted.

FIG. 11 is a side view schematically showing a columnar offshore wind power generation facility. As shown in this figure, a column-shaped offshore wind power generation facility consists of a column-shaped floating body (spar-type floating body) that floats in the sea, and a tower, rotor, nacelle, etc. installed on top of the column-shaped floating body. The tower is a structure that supports the rotor and nacelle, and the pillar-shaped floating body functions as the base of the tower. The rotor, which is made up 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 to land via a submarine cable. be. Note that columnar floating bodies are generally moored by the weight of catenary-shaped mooring lines.

By the way, as shown in Patent Document 1, conventional columnar floating bodies have a tube shape with a circular cross section (that is, a cylindrical tube), and are mainly manufactured by processing a steel plate.

Japanese Patent Application Publication No. 2013-141857

Steel cylindrical pipes (in other words, steel pipes) can be divided into seamless steel pipes (seamless steel pipes), welded steel pipes, etc. depending on the manufacturing method, but for large diameter (for example, φ10 m or more) such as columnar floating bodies, steel plates are made into curved steel pipes. Welded steel pipes will be used, which are formed by forming and welding them. Here, the manufacturing process of the columnar floating body will be explained with reference to FIG.

First, as shown in FIG. 12(a), a plate piece of a predetermined size (hereinafter referred to as a "cutout member" for convenience) is cut out from a large steel plate serving as a base material. This cutout member is a so-called part that constitutes a columnar floating body, and is therefore repeatedly cut out as many times as necessary (generally more than 1,000) to constitute a columnar floating body. Note that the cutout member shown in FIG. 12(a) is a plate material with a "flat" plate surface. The term "plane" used herein means that it is not a curved surface, and refers to a shape that is expressed by a general formula of a plane in three-dimensional space or approximated thereto. For convenience, herein, a plate material having a flat surface will be particularly referred to as a "face material."

Once the cutout member is cut out, the cutout member is bent using a method such as "steel plate bending" or "roller bending" as shown in FIG. 12(b). As described above, the conventional columnar floating body has a circular cross section, and the cut-out member serving as the face material is bent so as to constitute a part of the circle. Of course, this bending process is performed on all cut-out members. For convenience, here, a plate material having a curved surface is particularly referred to as a "curved surface material."

Once the cut-out member is bent, the cut-out member, which is a curved material, is placed on a mold jig as shown in Fig. 12(c), and adjacent cut-out members are joined together by welding. go. First, a half-section structure having a predetermined length (hereinafter referred to as a "half-section divided body") is formed. Further, as shown in FIG. 12(d), separately prepared subassemblies (ribs) are installed at predetermined intervals on the inner peripheral surface of the half-section divided body.

Once the half-section divided body is formed, the two half-section divided bodies are joined by welding to form a “divided body” with a circular cross-section, as shown in FIG. 12(e). Then, as shown in FIG. 12(f), a columnar floating body is completed by connecting the plurality of divided bodies in the axial direction.

In manufacturing such a columnar floating body, it is necessary to use a large amount of steel material, and moreover, a wide variety of processes must be performed. In particular, the bending process shown in Fig. 12(b) is performed on a large material (cut out member) with a board length of about 5 m, so only about one material (one piece) can be processed per day, and a large amount of (e.g. more than 1,000) cut-out parts must be processed. Therefore, bending costs a large amount of money, including labor costs, processing machine costs, and fuel costs, which is a major factor in pushing up the manufacturing cost of columnar floating bodies.

An object of the present invention is to solve the problems faced by the prior art, that is, to provide a columnar floating body that can be manufactured at a lower cost and in a shorter period of time than in the past, and a method for manufacturing the same. .

The present invention was made by focusing on the fact that the column main body of the hollow tube body is formed using the face material without bending the cut-out member, and it is based on an unprecedented idea. This was done based on the following.

The column-shaped floating body of the present invention constitutes a floating offshore wind power generation facility, and includes a column body that is hollow and column-shaped. This pillar body is formed by connecting a plurality of face members each having a flat plate surface in the circumferential direction, and has a polygonal cross-sectional shape.

The column-shaped floating body of the present invention may also include a column main body in which a plurality of refraction members (members formed by bending face members at a predetermined refraction angle) are connected in the circumferential direction. Furthermore, the column main body in this case is made up of a plurality of divided bodies (components in which a plurality of refracting members are connected in the circumferential direction) connected in the column axis direction, and the connecting positions of adjacent divided bodies in the column axis direction are different from each other. It can also be discontinuous.

The columnar floating body of the present invention may further include a diameter reducing body provided at one end of the column body. This diameter-reducing body is formed by connecting a plurality of face members or refracting members in the circumferential direction, and has a truncated cone shape whose cross-sectional area decreases outward from the column body, and the cross-sectional shape is a columnar shape. It has a cross-sectional shape similar to that of the main body.

The columnar floating body manufacturing method of the present invention is a method for manufacturing the columnar floating body of the present invention, and is a method comprising a cutting step, a placement step, and a connecting step. In the cutting step, the facing materials are cut out from the base material, and in the arranging step, a plurality of unbent facing materials are butted against each other at a predetermined intersection angle and arranged. In the connection step, the facing materials arranged in the arrangement step are connected (joined) by welding.

The columnar floating body manufacturing method of the present invention can also be a method that further includes a bending step. In this refraction step, the facing material is bent to a predetermined refraction angle to obtain a refraction material. In this case, in the arranging step, the plurality of refractive materials are arranged abutting each other at a predetermined intersection angle, and in the connecting step, the refractive materials arranged in the arranging step are connected by welding. Furthermore, in this case, the connecting step may include a divided body forming step and a divided body connecting step. In the divided body forming step, divided bodies are formed, and in the divided body connecting step, a plurality of divided bodies are connected in the column axis direction. At this time, it is preferable to connect the divided bodies adjacent to each other in the column axis direction so that the connecting positions thereof are discontinuous.

The columnar floating body manufacturing method of the present invention can also be a method using a placement jig formed at a predetermined intersection angle. In this case, in the placement step, the facing material or refractive material is placed while the placement jig is in contact with the inner peripheral surface of the facing material or refractive material.

The columnar floating body and method for manufacturing a columnar floating body of the present invention have the following effects.
(1) Since the bending process can be omitted, the manufacturing cost of the columnar floating body is significantly reduced compared to the conventional method. As a result, it will become easier to procure columnar floating bodies, and we can expect their adoption to expand.
(2) Since it is possible to reduce the burden on workers involved in bending, it can contribute to solving the problem of chronic shortage of human resources in recent years.
(3) Furthermore, since the consumption of various types of energy such as fuel and electric power required for bending can be reduced, the burden on the environment can be suppressed compared to conventional methods.

FIG. 1 is a perspective view schematically showing a columnar floating body of the present invention. (a) is a top view explaining a facing material, (b) is a side view explaining a facing material. FIG. 3 is a cross-sectional view schematically showing the cross-sectional shape of a pillar body. FIG. 1 is a perspective view schematically showing a columnar floating body of the present invention in which facing materials are arranged in a staggered manner. (a) is a plan view explaining a refraction material, (b) is a side view explaining a refraction material. FIG. 1 is a perspective view schematically showing a columnar floating body of the present invention. FIG. 2 is a flow diagram showing the main steps of the columnar floating body manufacturing method of the present invention in the first embodiment. FIG. 3 is a step diagram showing the main steps of the columnar floating body manufacturing method of the present invention in the first embodiment. (a) is a plan view from above of two facing materials placed with the placement jig in contact with the inner peripheral surface, and (b) shows the function of adjusting the intersection angle and the function of the conventional mold jig. FIG. 3 is a side view showing the facing material placed on the placement jig. FIG. 7 is a flow diagram showing the main steps of the columnar floating body manufacturing method of the present invention in a second embodiment. A side view schematically showing a spar-type offshore wind power generation facility. A step diagram schematically showing the manufacturing process of a columnar floating body.

An example of an embodiment of a columnar floating body (spar type floating body) and a method for manufacturing a columnar floating body of the present invention will be described based on the drawings. Note that the columnar floating body of the present invention can be particularly suitably implemented when used as a component of a floating offshore wind power generation facility, and the method for manufacturing a columnar floating body of the present invention can be carried out particularly when the columnar floating body of the present invention is used as a component of a floating offshore wind power generation facility. This can be particularly suitably carried out in the case of manufacturing.

1. Column-shaped Floating Body First, the column-shaped floating body of the present invention will be explained in detail with reference to the drawings. The method for manufacturing a columnar floating body of the present invention is a method for manufacturing a columnar floating body of the present invention, therefore, the columnar floating body of the present invention will be explained first, and then the method for manufacturing a columnar floating body of the present invention will be explained in detail. I decided to.

FIG. 1 is a perspective view schematically showing a columnar floating body 100 of the present invention. As shown in this figure, the columnar floating body 100 of the present invention includes a column main body 110, and can also include a diameter reducing body 120 and a bottom plate 130. Each of the main elements constituting the columnar floating body 100 will be explained below.

(Column body)
As shown in FIG. 1, the column main body 110 is an elongated body whose axis (hereinafter referred to as "column axis") dimension is larger than its cross-sectional dimension and is hollow inside, that is, its outer shape is approximately It has a tubular shape. One feature of the pillar body 110 is that it is formed of a plurality of facing materials FP.

FIG. 2 is a diagram illustrating the facing material FP, in which (a) is a plan view thereof, and (b) is a side view thereof. As shown in this figure, the facing material FP is a plate-shaped member whose wall thickness is smaller than its plane dimension, and its plate surface is generally plane (including planes). As mentioned above, the term "plane" here means that it is not a curved surface, and refers to a shape expressed by the general formula (ax+by+cz+d=0) for a plane in three-dimensional space.

The column main body 110 is formed by connecting a plurality of face members FR in the circumferential direction of the cross section by, for example, welding. Therefore, the cross-sectional shape of the pillar body 110 becomes a polygon as shown in FIG. In Fig. 3, a regular dodecagon is formed by 12 facing materials FR having the same width, but of course, the shape is not limited to this, and any number of n-gons (n is a natural number) can be formed, and regular polygons can also be formed. It is also possible to use a polygon (each side length is different) instead of (a polygon with all side lengths equal). Furthermore, as can be seen from FIG. 1, depending on the column axis length of the column body 110, a plurality of "divided bodies" (that is, one ring) in which a plurality of facing materials FR are connected in the cross-sectional circumferential direction (12 Steps) It is best to form them by connecting them. Alternatively, as shown in Fig. 4, a plurality of facing members FR adjacent in the circumferential direction are connected in the column axis direction so that the heights in the column axis direction are not the same (so-called staggered arrangement). You can also.

The pillar body 110 can also be formed of a refractive material RP instead of the facing material FR. FIG. 5 is a diagram illustrating the refractive material RP, in which (a) is a plan view thereof, and (b) is a side view thereof. As shown in this figure, the refractive material RP is a plate material obtained by bending the facing material FP at a predetermined refraction angle. Here, the predetermined refraction angle is an angle (in other words, an interior angle of the polygon) for completing the desired cross-sectional shape (polygon) of the columnar floating body 100 by the plurality of refraction materials RP, and for example, as shown in FIG. In the case of the regular dodecagon shown, the refraction angle of the refraction material RP is 150°. Note that the refractive material RP is not limited to one with one bending point (hereinafter referred to as a "refraction line") as shown in FIG. It is also possible to have more than one surface (that is, one made of three or more facing materials FP).

Although the pillar body 110 formed from the refractive material RP requires a little more effort than the case where it is formed from the face material FP, which does not require refraction processing, the effort is significantly reduced compared to conventional bending processing, and Another advantage is that there are fewer welding locations.

As shown in FIG. 6, depending on the length of the column axis of the column body 110 formed by the refractive material RP, a "divided body" (that is, one ring) in which a plurality of refractive materials RP are connected in the circumferential direction of the cross section may be connected in the column axis direction. It is preferable to form a plurality of (four stages partially shown in the figure) connected to each other. At this time, avoid so-called "pot joints" in which the connection positions (that is, welding lines WL) of adjacent divided bodies in the column axis direction are continuous (connected), and as shown in FIG. It is preferable to use a so-called "staggered arrangement" in which the welding lines WL of adjacent divided bodies are discontinuous (shifted). In general, welding points are more likely to become structural weaknesses than other parts, and by arranging welding lines WL in a staggered manner as shown in Figure 6, overall structural weakness can be alleviated. . Note that the divided body can be formed by only the refractive material RP, or can be formed by combining the refractive material RP and the facing material FR.

(Reduced diameter body)
The diameter reducing body 120 is connected to the tower (FIG. 11) that supports the rotor and the nacelle, and is a so-called adjustment section for changing from the large diameter of the column body 110 to the small diameter of the tower. Therefore, as shown in FIG. 1, the diameter reducing body 120 is provided at the upper end of the column main body 110 during use (when installed underwater), and is also cut away from the column main body 110 toward the outside in the column axis direction (upper side in the figure). It has a frustum shape (that is, a tapered shape) whose area is reduced.

The reduced diameter body 120 is formed by connecting a plurality of facing materials FR in the circumferential direction of the cross section, similarly to the column main body 110. More specifically, the facing material FR is arranged so as to be inclined inward (toward the center) toward the outside (upper side in the figure) in the pillar axis direction from the pillar body 110, and then connected in the circumferential direction. Therefore, the cross-sectional shape of the diameter-reducing body 120 is preferably polygonal and similar to the cross-sectional shape of the column main body 110. Also, as can be seen from FIG. 1, depending on the column axis length of the diameter reducing body 120, a structure (that is, one ring) in which a plurality of facing materials FR are connected in the circumferential direction may be formed in multiple stages (in two stages in the figure) in the column axis direction. It is best to form them by connecting them. Further, similarly to the pillar body 110, the diameter reducing body 120 can be formed of a refractive material RP instead of the facing material FR, or can be formed by combining the refractive material RP and the facing material FR.

(Bottom plate)
Since the columnar floating body 110 needs to float near the sea surface when in use, it has a structure that receives buoyancy. Therefore, a bottom plate 130 is provided at the lower end of the column main body 110 during use. The sealing with the bottom plate 130 prevents seawater from entering the inside of the columnar floating body 110, that is, creates a pressure difference between the inside of the columnar floating body 110 and the sea. Note that the bottom plate 130 is preferably polygonal in plan view, and further preferably has a cross-sectional shape similar to that of the column body 110.

2. Column-shaped floating body manufacturing method Next, the column-shaped floating body manufacturing method of the present invention will be explained in detail with reference to the drawings. The columnar type floating body manufacturing method of the present invention is a method for manufacturing the columnar type floating body 100 described so far, so the description that overlaps with the content explained for the columnar type floating body 100 will be avoided, and the columnar type floating body manufacturing method of the present invention will be explained. Only the content specific to the method will be explained. That is, the contents not described here are the same as those explained in "1. Column-shaped floating body".

Further, the method for manufacturing a columnar floating body of the present invention has two modes in which the columnar floating body 110 is formed using the facing material FR (hereinafter referred to as the "first embodiment") and a form in which the columnar floating body 110 is formed using the refractive material RP (or the refractive material RP and the facing material). (hereinafter referred to as "second embodiment") in which a columnar floating body 110 is formed (by combining FRs). Each embodiment will be explained in order below.

(First embodiment)
FIG. 7 is a flowchart showing the main steps of the columnar floating body manufacturing method of the present invention in the first embodiment, and FIG. 8 is a flowchart showing the main steps of the columnar floating body manufacturing method of the present invention in the first embodiment. It is a step diagram showing a process.

First, as shown in FIG. 8A, a plate piece (cutout member) of a predetermined size is cut out from a large steel plate serving as a base material (Step 101 in FIG. 7). In this cutting process, the necessary number of cut-out members (generally more than 1,000) forming the columnar floating body 100 of the present invention are repeatedly cut out. In addition, since the cutout member in the state cut out in FIG. 8(a) is a facing material FP, the cutout member will be referred to as a facing material FP below.

Once the facing material FP is cut out, the facing material FP is placed, for example, on a mold jig as shown in FIG. 8(b) (Step 102 in FIG. 7). At this time, two adjacent facing materials FP are placed so as to butt against each other so as to form a predetermined intersection angle. Here, the predetermined intersection angle is an angle (that is, an interior angle of the polygon) for completing the desired cross-sectional shape (polygon) of the columnar floating body 100 by the plurality of facing materials FP, and for example, as shown in FIG. In the case of the regular dodecagon shown, the intersection angle of two adjacent facing materials FP is 150°. In the arrangement process of the present invention, it is important to arrange the facing material FP as it is, that is, without bending the facing material FP (FIG. 12(b)) as in the prior art (in other words, bending the facing material FP into a curved material). (without processing) the facing material FP is placed. As a result, the manufacturing cost of the columnar floating body 100 can be significantly reduced compared to the conventional method.

By the way, it is not easy to visually arrange the facing material FP so that a predetermined intersection angle is achieved. Therefore, as shown in FIG. 9(a), it is preferable to arrange two adjacent facing materials FP using a placement jig AT. This placement jig AT has a predetermined intersection angle (for example, 150° in the case of FIG. 3), and therefore, when this placement jig AT is placed in contact with the inner peripheral surface of the facing material FP, , two adjacent facing materials FP are butted against each other at a predetermined intersection angle. In this case, if the facing material FP is placed on the floor so that its plate surface is in a substantially vertical (including vertical) position, it will be relatively easy to adjust the position with the placement jig AT in contact with it. Become. However, to prevent the facing material FP from falling over, it is preferable to lift it up using a crane or the like, and to support it from the front and back sides of the facing material FP with support materials.

Alternatively, it is also possible to arrange two adjacent facing materials FP using the arrangement jig AT shown in FIG. 9(b). The arrangement jig AT shown in FIG. 9(b) also has a predetermined intersection angle (for example, 150° in the case of FIG. 3), and has a plurality of (five in the figure) facing surfaces as shown in this figure. By simply placing the material FP on the placement jig AT, two adjacent facing materials FP are automatically butted against each other at a predetermined intersection angle. In other words, the placement jig AT shown in FIG. 9(b) is a jig that has both the function of adjusting the intersection angle and the function of a conventional mold jig. However, as shown in Fig. 12(c), in the conventional mold jig, the cutout member (curved material) is placed so that the inner circumferential surface faces upward, whereas in Fig. 9(b) The placement jig AT shown in FIG. 1 is used to place the facing material FP so that its outer circumferential surface faces upward. As can be seen from FIG. 9(a), when two adjacent facing materials FP are butted against each other, a so-called "groove" is provided on the outer circumferential surface thereof, so the arrangement jig shown in FIG. 9(b) is used. When the facing material FP is placed on the AT, the next process of connection (welding and joining) can be performed in that state.

When the facing material FP is placed, adjacent cut-out members are joined (connected) by welding or the like (Step 103 in FIG. 7), and a half-section divided body (half-section structure with a predetermined length) is formed for the time being. . Further, as shown in FIG. 8C, separately prepared subassemblies (ribs) are installed at predetermined intervals on the inner peripheral surface of the half-section divided body (Step 104 in FIG. 7). Once the half-section divided body is formed, the two half-section divided bodies are joined by welding or the like, as shown in FIG. 7, Step 105). Then, as shown in FIG. 8E, the column main body 110 is formed by connecting a plurality of (four stages in the figure) divided bodies in the axial direction (Step 106 in FIG. 7).

Further, a diameter reducing body 120 formed in the same process as the pillar body 110 is attached to one end (upper end) of the pillar body 110 (Step 107 in FIG. 7), and a bottom plate 130 is attached so as to close the other end (lower end) of the pillar body 110. is fixed (Step 108 in FIG. 7), and the columnar floating body 100 of the present invention is completed.

(Second embodiment)
FIG. 10 is a flow diagram showing the main steps of the columnar floating body manufacturing method of the present invention in the second embodiment.

First, as in the first embodiment, a facing material FP is cut out from a large steel plate serving as a base material (Step 201 in FIG. 10). After cutting out the facing material FP, the facing material FP is bent at a predetermined refraction angle to obtain a refractive material RP (Step 202 in FIG. 10). This bending process is repeated as many times as there are cut out facing materials FP.

Once the refractive materials RP are obtained, similar to the first embodiment, the refractive materials RP are arranged (Step 203 in FIG. 10), and adjacent refractive materials RP are joined (connected) by welding or the like (Step 203 in FIG. 10). In Step 204), a half-section divided body is first formed. In addition, separately prepared subassemblies (ribs) are installed at predetermined intervals on the inner peripheral surface of the half-section divided body (Step 205 in FIG. 10). When the half-section divided body is formed, the two half-section divided bodies are joined by welding or the like to form a divided body having a polygonal cross section (Step 206 in FIG. 10). Then, the column main body 110 is formed by connecting a plurality of (four stages in the figure) divided bodies in the axial direction (Step 207 in FIG. 10). At this time, as shown in FIG. 6, it is preferable to connect the welding lines WL of the divided bodies adjacent in the column axis direction so that they are discontinuous (staggered arrangement).

Further, a diameter reducing body 120 formed in the same process as the column body 110 is attached to one end (upper end) of the column body 110 (Step 208 in FIG. 10), and a bottom plate 130 is attached so as to close the other end (lower end) of the column body 110. is fixed (Step 209 in FIG. 10), and the columnar floating body 100 of the present invention is completed.

The columnar floating body and the method for manufacturing a columnar floating body of the present invention can be particularly suitably used for floating offshore wind power generation in sea areas deeper than 50 m. According to the present invention, it is possible to construct a floating offshore wind power generation facility at a low cost, so it is possible to expect more active motivation for offshore wind power generation, which in turn will reduce greenhouse gas emissions and provide stable Considering that the present invention can be used to supply energy for a long time, it can be said that the present invention is not only industrially applicable but also can be expected to make a significant contribution to society.

100 Column type floating body of the present invention 110 Column main body (of the column type floating body) 120 Diameter reducing body (of the column type floating body) 130 Bottom plate (of the column type floating body) AT Placement jig FP Face material RP Refraction material WL Welding line

Claims (4)

In column-shaped floating bodies that constitute floating offshore wind power generation facilities,
It includes a pillar body that is hollow and pillar-shaped,
The pillar body is formed by connecting a plurality of refracting materials in the circumferential direction, which are formed by bending a facing material with a flat plate surface at a predetermined refraction angle, and has a polygonal cross-sectional shape,
Further, the pillar main body is formed by connecting a plurality of divided bodies in which a plurality of the refractive materials are connected in the circumferential direction in the pillar axis direction,
connection positions of the divided bodies adjacent in the column axis direction are discontinuous;
A columnar floating body characterized by: further comprising a diameter reducing body provided at one end of the column main body,
The diameter-reducing body is formed by connecting a plurality of the facing materials or the refractive materials in the circumferential direction, and has a frustum shape whose cross-sectional area decreases outward from the column body, and has a cross-sectional area. The shape is similar to the cross-sectional shape of the column body,
The columnar floating body according to claim 1, characterized in that: In a method of manufacturing a columnar floating body constituting a floating offshore wind power generation facility,
a cutting process of cutting out a facing material with a flat plate surface from the base material;
a refraction step of bending the face material to a predetermined refraction angle to obtain a refraction material;
an arrangement step of arranging a plurality of the refractive materials abutting each other at a predetermined intersection angle;
a connecting step of connecting the refractive materials arranged in the arranging step by welding,
The connecting step includes a divided body forming step of forming a divided body in which a plurality of the refractive materials are connected in the circumferential direction, and a divided body connecting step of connecting the plurality of divided bodies in the column axis direction,
In the divided body connecting step, the divided bodies adjacent in the column axis direction are connected so that the connecting positions thereof are discontinuous,
By connecting the plurality of divided bodies in the column axis direction , a hollow columnar column main body is manufactured.
A method for manufacturing a columnar floating body characterized by the following. In the placement step, using a placement jig formed at a predetermined intersection angle, the refraction material is placed while the placement jig is in contact with the inner peripheral surface of the refraction material.
4. The method for manufacturing a columnar floating body according to claim 3.

Images