JP2023091355A - Columnar shape floating body and manufacturing method of columnar shape floating body - Google Patents

Abstract

To provide a columnar shape floating body capable of being manufactured at a lower cost and in a shorter period of time than before to solve problems of a conventional technology, and to provide its manufacturing method.SOLUTION: A columnar shape floating body of the present invention constitutes a floating offshore wind power generation facility and comprises a column body of a hollow columnar shape. The column body is formed by connecting multiple bending-planar members in a circumferential direction. The bending-planar member is constituted by including a planar section and a bent part formed on one end side, and a cross-sectional shape of the column body is a polygon with a curved apex.SELECTED DRAWING: Figure 8

Description

The present invention relates to a columnar floating body that constitutes a floating offshore wind power generation facility. It relates to a manufacturing method.

Electricity consumption in Japan temporarily declined due to the effects of the global financial crisis in 2008, but has continued to increase since the oil crisis in 1973. Between fiscal 1973 and 2007, It is magnified up to 2.6 times. The background to this is the spread of so-called home electric appliances such as air conditioners and electric carpets with the improvement in living standards, and the spread of OA (Office Automation) equipment and communication equipment with the increase in office buildings.

Until now, power generation using so-called fossil fuels such as petroleum and coal has mainly supported such a huge amount of electric power demand. In recent years, however, attention has been focused on the problem of depletion of fossil fuels and environmental problems associated with global warming, and in response to this, power generation methods have gradually changed. As a result, around 1973, as described above, power generation from oil and coal accounted for about 90% of the total power generation, but in 2010, that proportion decreased to 66%. Instead, nuclear power generation, which accounts for over 10% of the total (2010), has increased. Nuclear power generation has a remarkable effect on reducing greenhouse gases compared to conventional power generation methods, and it can provide power at low cost, so it has greatly contributed to Japan's power demand.

In addition, a power generation method using renewable energy is also being adopted in that it is possible to suppress the emission of greenhouse gases. This renewable energy is energy that can be literally regenerated, such as solar power, wind power, geothermal power, small- and medium-sized hydropower, and woody biomass, and it is a promising low-carbon energy because it reduces greenhouse gas emissions and can be produced domestically. Expected.

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

Wind power generation can be broadly divided into onshore wind power generation and offshore wind power generation, depending on the installation location. Of these, onshore wind power generation is easier to install than offshore wind power generation, and has the advantage of being able to keep costs down. . On the other hand, offshore wind power generation does not have the noise problem associated with onshore wind power generation, avoids the risk of damage due to overturning, etc., and above all, has the advantage of being able to stably obtain a large amount of wind power compared to onshore wind power generation. I have. Japan, which has the sixth largest exclusive economic zone in the world, is suitable for floating offshore wind power generation, and is considered to be a promising production area for renewable energy in the future.

In addition, different types of offshore wind power generation are adopted depending on the installation location. It is said that bottom-mounted offshore wind power generation is suitable for sea areas shallower than 50m, and floating offshore wind power generation is suitable for seas deeper than 50m. . Of these, floating offshore wind power generation uses a floating body that floats on seawater, and is a method in which a power generation mechanism is installed on the floating body connected by mooring ropes, and the power generation mechanism is used to generate electricity. Floating body types include pontoon type (barge type), semi-sub type, spar type (columnar type), tension mooring type (TLP: Tension Leg Platform), etc., and are located away from land areas where large wind power can be obtained. Offshore, the main trend is to adopt the columnar type.

FIG. 16 is a side view schematically showing a columnar offshore wind power generation facility. As shown in this figure, a columnar offshore wind power generation facility includes a columnar floating body (spar-type floating body) that floats in the sea, and a tower, rotor, nacelle, etc. installed thereon. The tower is a structure that supports the rotor and nacelle, and the columnar floating body functions as the foundation of the tower. A rotor consisting of blades and a hub converts the wind into power, and a nacelle containing gearboxes, generators, transformers, etc. converts the power into electricity, which is then transmitted to land through submarine cables. be. The columnar floating body is generally moored by the weight of catenary-shaped mooring cables.

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

JP 2013-141857 A

Steel columnar pipes (that is, steel pipes) are divided into seamless steel pipes (seamless) and welded steel pipes, etc., depending on the manufacturing method. A welded steel pipe is used, which is formed by welding after forming into a steel pipe. Here, the manufacturing process of the columnar floating body will be described with reference to FIG.

First, as shown in FIG. 17(a), a plate piece of a predetermined size (hereinafter referred to as "cut-out member" for convenience) is cut out from a large steel plate as a base material. This cut-out member is, so to speak, a part that constitutes the columnar floating body, and therefore is repeatedly cut out by the required number (generally more than 1,000) that constitutes the columnar floating body. It should be noted that the cut-out member cut out in FIG. 17A is a plate material having a “flat” plate surface. The term "plane" as used herein means a non-curved surface, and refers to a shape represented by a general formula for a plane in a three-dimensional space or a shape approximated thereto. For the sake of convenience, a plate material having a flat plate surface is particularly referred to as a "face plate".

After the cut member is cut out, as shown in FIG. 17(b), the cut member is subjected to bending using techniques such as "steel plate bending" and "roller bending". As described above, the cross section of the conventional columnar floating body is circular, and the cut-out member, which is the facing member, is bent so as to form a part of the circular shape. Of course, this bending process is performed for all the cut-out members. For the sake of convenience, a plate material having a curved plate surface is particularly referred to as a "curved surface material".

After bending the cut-out member, the cut-out member, which is a curved surface material, is placed on the mold jig as shown in FIG. go. Then, for the time being, a half-section structure (hereinafter referred to as "half-section divided body") having a predetermined length is formed. Further, as shown in FIG. 17(d), separately prepared small assemblies (ribs) are installed at predetermined intervals on the inner peripheral surface of the half-section divided body.

After the half-section splits are formed, the two half-section splits are welded together to form a "split" with a circular cross section, as shown in FIG. 17(e). Then, as shown in FIG. 17(f), a columnar floating body is completed by connecting a plurality of divided bodies in the axial direction.

In order to manufacture a columnar floating body in this way, it is necessary to use a large amount of steel materials and to carry out a wide variety of processes. In particular, the bending process shown in FIG. 17(b) is performed on a large material (cut-out member) having a plate length of about 5 m. (eg, more than 1,000) must be processed. Therefore, bending requires a large amount of expenses such as labor costs, processing machine loss, and fuel costs.

An object of the present invention is to solve the problems of 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 before, and a method for manufacturing the same. .

The invention of the present application has been made with a focus on forming a column main body of a hollow tubular body with most of the face material as it is, without bending the entire cut-out member. It was based on an unprecedented idea.

The columnar floating body of the present invention constitutes a floating offshore wind power generation facility, and includes a hollow columnar column body. This column main body is formed by connecting a plurality of bending facing materials in the circumferential direction. In addition, the bent face member is configured to include a "flat portion" and a "bent portion" formed at one end, and the cross-sectional shape of the column body is a polygon with a curved top.

The columnar floating body of the present invention can also use a bent facing member having a bent portion formed in the intermediate portion. In this case, the facing material for bending has flat portions arranged at two locations, and a bent portion is arranged at a position sandwiched between these flat portions. In addition, the column main bodies are connected in the circumferential direction after butting each other such that the flat portions of the adjacent bending-processed facing members are on substantially the same surface (including the same surface).

The columnar floating body of the present invention can also use a bent facing member including two or more bent portions. In this case, the bending facing members are arranged at respective positions sandwiched between the plane portions.

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-reduced body is formed by connecting a plurality of bending facing members in the circumferential direction, and has a frustum shape with a cross-sectional area that decreases outward from the pillar body. It is similar to the cross-sectional shape of

The columnar floating body manufacturing method of the present invention is a method of manufacturing the columnar floating body of the present invention, and comprises a cutting process, an end bending process, an arrangement process, and a connecting process. In the cutting step, a facing member is cut out from the base material, and in the end bending step, one end of the facing member is bent to obtain a bent facing member. Further, in the arranging step, a plurality of bending facing members are placed against each other at a predetermined crossing angle, and in the connecting step, the bending facing members arranged in the arranging step are connected (joined) by welding. A hollow columnar column body is manufactured by connecting a plurality of bent facing members in the circumferential direction after abutting the flat portions and bending portions of the adjacent bent facing members.

The method for manufacturing a columnar floating body according to the present invention can also be a method including an intermediate portion bending step. In this intermediate portion bending step, the intermediate portion of the facing member is subjected to bending to obtain a bent facing member. The bending facing member in this case includes flat portions arranged at two locations and a bending portion sandwiched between the flat portions. Then, after the planar portions of the adjacent bent facing members are butted against each other so that they are substantially on the same surface (including the same surface), a plurality of bent facing members are connected in the circumferential direction to form a hollow A column body having a columnar shape is manufactured.

The columnar floating body manufacturing method of the present invention can also be a method including a bending step. In this bending step, the facing member is bent at two or more locations to obtain a bent facing member. In this case, the bent facing material includes bent portions at respective positions sandwiched between flat portions. Then, the end portions of adjacent bent facing members are butted against each other, and then a plurality of bent facing members are connected in the circumferential direction to manufacture a hollow columnar column body.

The columnar floating body and the columnar floating body manufacturing method of the present invention have the following effects.
(1) Only the ends of the cut-out member are bent, and the manufacturing cost of the columnar floating body is greatly reduced compared to the conventional technology in which the entire cut-out member is bent. be done. As a result, it will become easier to procure columnar floating bodies, and it is expected that the adoption of columnar floating bodies will expand.
(2) Since the burden on workers involved in bending can be reduced, it is possible to contribute to solving the problem of chronic labor shortages in recent years.
(3) In addition, since the consumption of various energies such as fuel and electric power required for bending can be reduced, the load on the environment can be suppressed as compared with the conventional art.
(4) Stress concentration is likely to occur if the apex of a cross-sectional view is a structurally discontinuous “corner”. On the other hand, according to the present invention, since the top portion is bent, stress concentration can be alleviated.

The perspective view which shows typically the columnar type|mold floating body of this invention. (a) is a plan view for explaining the facing material, and (b) is a side view for explaining the facing material. Sectional drawing which shows the cross-sectional shape of a pillar main body typically. Fig. 2 is a perspective view schematically showing a columnar floating body of the present invention in which facing members are arranged in a zigzag arrangement; (a) is a plan view for explaining the refractive material, and (b) is a side view for explaining the refractive material. The perspective view which shows typically the columnar type|mold floating body of this invention. (a) is a plan view for explaining the bending facing material, and (b) is a side view for explaining the bending facing material. Sectional drawing which shows typically a part of pillar main body formed of the bending facing material. (a) is a plan view explaining a bent facing member having a bent portion in the middle, and (b) is a side view explaining a bent facing member having a bent portion in the middle. Sectional drawing which shows typically a part of column main body formed of the bending facing material which has a bending part in the middle. FIG. 2 is a flowchart showing main steps of the method for manufacturing a columnar floating body according to the first embodiment of the present invention; FIG. 4 is a step diagram showing main steps of the method for manufacturing a columnar floating body of the present invention in the first embodiment; (a) is a top plan view of two facing members placed while the placement jig is in contact with the inner peripheral surface side, and (b) shows the function of adjusting the crossing angle and the function of the conventional mold jig. The side view which shows the facing material mounted on the jig|tool for arrangement|positioning held together. The flowchart which shows the main process of the columnar type|mold floating body manufacturing method of this invention in 2nd Embodiment. FIG. 10 is a flow diagram showing main steps of a method for manufacturing a columnar floating body according to the third embodiment of the present invention; FIG. 2 is a side view schematically showing a spar type offshore wind power generation facility. FIG. 4 is a step diagram schematically showing a manufacturing process of a columnar floating body;

An example of an embodiment of a columnar floating body (spar type floating body) and a columnar floating body manufacturing method of the present invention will be described with reference to the drawings. It should be noted 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. It can be carried out particularly preferably when manufacturing.

1. Columnar Floating Body First, the columnar floating body of the present invention will be described in detail with reference to the drawings. The columnar floating body manufacturing method of the present invention is a method of manufacturing the columnar floating body of the present invention. Therefore, the columnar floating body of the present invention will be described first, and then the columnar floating body manufacturing method of the present invention will be described 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-reduced body 120 and a bottom plate 130. FIG. Each of the main elements constituting the columnar floating body 100 will be described below.

(pillar body)
As shown in FIG. 1, the column main body 110 is a long body whose axial dimension (hereinafter referred to as "column axis") is larger than its cross-sectional dimension, and the interior is hollow. It has a tubular shape. One of the features of the pillar body 110 is that it is formed of a plurality of facing members FP.

2A and 2B are diagrams for explaining the facing material FP, in which FIG. 2A is a plan view thereof and FIG. 2B is a side view thereof. As shown in this figure, the facing material FP is a plate-like member having a thickness dimension smaller than its planar dimension, and its plate surface is generally flat (including a plane). As described above, the term “plane” here means that it is not a curved surface, and refers to a shape represented by the general formula (ax+by+cz+d=0) of a plane in a three-dimensional space.

The column body 110 is formed by connecting a plurality of facing members FP in the circumferential direction of the cross section, for example, by welding. Therefore, the cross-sectional shape of the column body 110 is polygonal as shown in FIG. In FIG. 3, 12 facing members FP having the same width form a regular dodecagon, but this is not limitative, and an arbitrary number of n-gons (n is a natural number) may be used. It can also be a polygon (each side length is different) that is not (a polygon with all side lengths equal). Also, 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 members FP are connected in the cross-sectional circumferential direction may be arranged in the column axis direction (12 in the figure). stage) is preferably formed by connecting. Alternatively, as shown in FIG. 4, a plurality of facing members FP are connected in the direction of the axis of the pillar so that the facing members FP adjacent in the circumferential direction are not arranged at the same height in the direction of the axis of the pillar (so-called staggered arrangement). can also

The pillar body 110 can also be formed of a refractive material RP instead of the facing material FP. 5A and 5B are diagrams for explaining the refractive material RP, where (a) is its plan view and (b) is its side view. As shown in this figure, the refractive material RP is a plate material obtained by bending a facing material FP at a predetermined refraction angle. Here, the predetermined refraction angle is an angle (that is, an internal angle of the polygon) for completing the desired cross-sectional shape (polygon) of the columnar floating body 100 with a plurality of refractive materials RP. If it is a regular dodecagon as shown, the refraction angle of the refractive material RP is 150°. It should be noted that the refractive material RP is not limited to one having one bending point (hereinafter referred to as "refraction line") as shown in FIG. It can also be made up of more than one piece (that is, made up of three or more facing members FP).

The pillar body 110 formed of the refractive material RP is somewhat labor intensive compared to the case formed of the facing material FP which does not require refraction processing. Another advantage is that there are fewer welds.

As shown in FIG. 6, depending on the column axis length of the column body 110 formed of the refractive materials RP, a "divided body" (that is, one ring) in which a plurality of refractive materials RP are connected in the cross-sectional circumferential direction can be arranged in the column axis direction. It is preferable that a plurality (four stages partially shown in the figure) be connected to each other. At this time, so-called "joints" in which the connecting positions (that is, welding lines WL) of the divisions adjacent in the column axis direction are continuous (connected) are avoided, and as shown in FIG. It is preferable that the welding lines WL of the divided bodies adjacent to each other are discontinuous (shifted) in a so-called "staggered arrangement". In general, welding points tend to be structurally weak points compared to other parts, and by staggering the welding lines WL as shown in Fig. 6, the overall structural weakness can be alleviated. . The divided body can be formed only by the refractive material RP, or can be formed by combining the refractive material RP and the facing material FP.

The column body 110 can also be formed of a bending facing material BP instead of the facing material FP and the refractive material RP. 7A and 7B are diagrams for explaining the bending facing member BP, in which (a) is a plan view and (b) is a side view thereof. As shown in this figure, the bending facing material BP is obtained by bending one end of the facing material FP (on the right side in the figure). It is a plate member having a processed portion SR.

The main body 110 using the bent facing members BP is also formed by connecting a plurality of bent facing members BP in the cross-sectional circumferential direction, for example, by welding. At this time, the adjacent bending facing members BP are arranged so that the end faces of the flat portion SF and the bending portion SR face each other, as shown in FIG. Therefore, the cross-sectional shape of the column main body 110 is generally a polygonal shape with a curved top (hereinafter referred to as a "chamfered polygonal shape" for convenience). Also in this case, it is preferable to form a plurality of "divided bodies" (that is, one ring) in which a plurality of bending face members BP are connected in the circumferential direction of the cross section, and are connected in the direction of the column axis. The divided body can be formed only by the bending facing material BP, or can be formed by combining the facing material FP and the refractive material RP.

As shown in FIG. 7(b), the bent portion has a so-called fan shape in a cross-sectional view, and the central angle thereof is the same as the refraction angle of the refractive material RP. It is the angle (that is, the internal angle of the polygon) for completing the cross-sectional shape of 100 (chamfered polygon). In general, the smaller the bending radius, the shorter the machining time, but the disadvantage is that stress concentration tends to occur. The larger the bending radius, the longer the machining time, but the structural continuity is good There is an advantage that stress concentration can be alleviated. Therefore, the bending radius of the bending portion SR (that is, fan shape) can be arbitrarily designed according to the situation, and is preferably designed with a bending radius of 50 mm or more and 1000 mm or less, more preferably 100 mm or more and 300 mm or less.

The bending facing material BP includes bending parts SR at the ends (Fig. 7), and bending parts SR in the middle part as shown in Fig. 9 (hereinafter, particularly "intermediate bending facing material BPM”). 9A and 9B are diagrams for explaining the intermediate bending facing material BPM, where (a) is its plan view and (b) is its side view. As shown in FIG. 9, this intermediate bending facing member BPM is obtained by subjecting the intermediate portion (approximately the center in the drawing) of the facing member FP to a bending process. It is a plate member in which a bent portion SR is formed at a position sandwiched between facing members FP.

The main body 110 using intermediate bending facing members BPM is also formed by connecting a plurality of intermediate bending facing members BPM in the cross-sectional circumferential direction, for example, by welding. At this time, as shown in FIG. 10, the adjacent bending facing members BP are arranged such that the end surfaces of the adjacent flat portions SF are butted against each other, and the adjacent flat portions SF are substantially coplanar (coplanar). including ). As a result, the cross-sectional shape of the column body 110 becomes a "chamfered polygon" as in FIG. Also in this case, it is preferable to form a plurality of "divided bodies" (that is, one ring) in which a plurality of intermediate bending face members BPM are connected in the circumferential direction of the cross section, and are connected in the direction of the column axis. The divided body can be formed only by the intermediate bending facing material BPM, or can be formed by combining the facing material FP, the refractive material RP, and the bending facing material BP.

The intermediate bending facing member BPM shown in FIGS. 9 and 10 has two plane portions SF and one bending portion SR, but is not limited to this, and has three or more plane portions SF and two or more bending portions. It can also have a part SR. For example, the flat portions SF are formed at n locations (n is a natural number equal to or greater than 3), and the bending portions SR are formed at (n−1) locations sandwiched between the flat portions SF. Further, the intermediate bending facing member BPM can also have a bending portion SR at one or both ends (that is, a combination of the bending facing member BP and the intermediate bending facing member BPM). 7 and 8 has the bending part SR only at one end, but it is not limited to this, and the bending part SR can be formed at both ends. .

Although the column body 110 formed of the bending facing material BP (including the intermediate bending facing material BPM) requires a little more work than the case formed of the facing material FP that does not require end bending, the conventional Compared to bending, the labor required for this process is greatly reduced, and since the tops of the polygons are chamfered, there is the advantage that damage such as chipping and denting is less likely to occur.

(reduced diameter body)
The reduced diameter member 120 is connected to the tower (FIG. 16) that supports the rotor and nacelle, and is a so-called adjustment section for changing 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 body 110 when in use (during installation in the sea), and is cut from the column body 110 outward in the column axial direction (upward in the figure). It has a truncated cone shape (that is, a tapered shape) whose area is reduced.

The diameter-reduced body 120 is formed by connecting a plurality of facing members FP in the cross-sectional circumferential direction, similarly to the column body 110 . More specifically, facing members FP are arranged so as to incline inward (center side) from the pillar body 110 toward the outer side (upper side in the drawing) in the pillar axial direction, and then connected in the circumferential direction. Therefore, the cross-sectional shape of the reduced-diameter body 120 should be polygonal, and should be similar to the cross-sectional shape of the column body 110 . As can be seen from FIG. 1, depending on the axial length of the diameter-reduced body 120, a plurality of structural bodies (that is, one ring) in which a plurality of facing members FP are connected in the circumferential direction are arranged in the axial direction (two stages in the figure). It is good to connect and form. As with the column body 110, the reduced-diameter body 120 can be formed of a refractive material RP or a bending facing material BP (including an intermediate bending facing material BPM) instead of the facing material FP, or can be formed by combining the refractive material RP and the facing material BP. It can also be formed by combining the material FP and the bending facing material BP (including the intermediate bending facing material BPM). In FIG. 4 , the diameter reducing body 120 is integrally installed on the top of the column main body 110 , but not limited to this, the diameter reducing body 120 consisting of multiple stages can also be installed on the top of the column body 110 . In this case, the diameter-reduced members 120 are sequentially stacked so that the cross-sectional area decreases upward.

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

2. Columnar Floating Body Manufacturing Method Subsequently, the columnar floating body manufacturing method of the present invention will be described in detail with reference to the drawings. The method for manufacturing a columnar floating body according to the present invention is a method for manufacturing the columnar floating body 100 described so far. Only method-specific content will be described. That is, the contents not described here are the same as those described in "1. Columnar type floating body".

In addition, the columnar floating body manufacturing method of the present invention includes a form in which the columnar floating body 110 is formed by the facing material FP (hereinafter referred to as "first embodiment"), and a refractive material RP (or the refractive material RP and the facing material). A columnar floating body 110 is formed by combining FPs (hereinafter referred to as "second embodiment"), and further by bending facing material BP (or combining refractive material RP and facing material FP). It can be broadly classified into a form forming 110 (hereinafter referred to as a "third embodiment"). Hereinafter, each embodiment will be described in order.

(First embodiment)
FIG. 11 is a flowchart showing the main steps of the method for manufacturing a columnar floating body of the present invention in the first embodiment, and FIG. It is a step figure which shows a process.

First, as shown in FIG. 12(a), a plate piece (cut-out member) of a predetermined size is cut out from a large steel plate as a base material (Step 101 in FIG. 11). In this cutting process, the required number of cut members (generally exceeding 1,000) constituting the columnar floating body 100 of the present invention is cut out repeatedly. Since the cut member cut out in FIG. 12A is the facing material FP, the cut member is hereinafter referred to as the facing material FP.

After cutting out the facing material FP, the facing material FP is placed on, for example, a mold jig as shown in FIG. 12(b) (Step 102 in FIG. 11). At this time, two adjacent facing materials FP are arranged so as to face each other at a predetermined crossing angle. Here, the predetermined crossing angle is an angle (that is, an internal angle of the polygon) for completing the desired cross-sectional shape (polygon) of the columnar floating body 100 by the plurality of facing members FP. In the case of the regular dodecagon shown, the intersection angle of two adjacent facing materials FP is 150°. In the placement process of the present invention, it is important to place the facing material FP as it is, that is, without bending the facing material FP (Fig. The facing material FP is arranged without processing). As a result, the manufacturing cost of the columnar floating body 100 can be significantly reduced as compared with the conventional one.

By the way, it is not easy to visually arrange the facing members FP so as to form a predetermined crossing angle. Therefore, as shown in FIG. 13(a), it is preferable to arrange two adjacent facing materials FP using an arrangement jig AT. This arranging jig AT is formed with a predetermined crossing angle (for example, 150° in the case of FIG. 3). , two adjacent facing materials FP are butted at a predetermined crossing angle. In this case, if the facing material FP is placed on the floor surface and the board surface is in a substantially vertical (including vertical) posture, it is relatively easy to adjust the position while the placement jig AT is in contact with it. Become. However, it is preferable that the facing material FP is lifted by a crane or the like so as not to fall over, and that the facing material FP is supported by support materials from the front and back sides thereof.

Alternatively, two adjacent facing members FP can be arranged using an arrangement jig AT shown in FIG. 13(b). A predetermined crossing angle (for example, 150° in the case of FIG. 3) is also formed in the arrangement jig AT shown in FIG. Only by placing the material FP on the arranging jig AT, two adjacent facing materials FP are automatically butted against each other at a predetermined intersection angle. That is, the placement jig AT shown in FIG. 13B is a jig that has both the function of adjusting the crossing angle and the function of a conventional molding jig. However, as shown in FIG. 17(c), the conventional molding jig is placed so that the inner peripheral surface of the cut-out member (curved surface member) faces upward, whereas FIG. 2 is placed so that the outer peripheral surface of the facing member FP faces upward. As can be seen from FIG. 13(a), when two adjacent facing members FP are butted against each other, a so-called "groove" is provided on the outer peripheral surface side, and therefore the placement jig shown in FIG. 13(b). When the facing material FP is placed on the AT, the next step of connection (welding) can be performed in that state.

After the facing material FP is arranged, the adjacent cut-out members are joined (connected) by welding or the like (Step 103 in FIG. 11) to form a half-section divided body (half-section structure of a predetermined length) for the time being. . Further, as shown in FIG. 12(c), separately prepared small assemblies (ribs) are installed at predetermined intervals on the inner peripheral surface of the half-section divided body (Step 104 in FIG. 11). After the half-section split bodies are formed, the two half-section split bodies are joined by welding or the like as shown in FIG. 11 Step 105). Then, as shown in FIG. 12(e), the column main body 110 is formed by axially connecting a plurality of (four stages in the figure) divided bodies (Step 106 in FIG. 11).

Furthermore, a reduced-diameter 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 107 in FIG. 11), and a bottom plate 130 is attached so as to block the other end (lower end) of the column body 110. are fixed (Step 108 in FIG. 11) to complete the columnar floating body 100 of the present invention.

(Second embodiment)
FIG. 14 is a flowchart showing main steps of the method for manufacturing a columnar floating body according to the second embodiment of the present invention.

First, as in the first embodiment, a facing material FP is cut out from a large steel plate as a base material (Step 201 in FIG. 14). 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. 14). This bending step is repeated by the number of cut facing members FP.

When the refractive materials RP are obtained, as in the first embodiment, the refractive materials RP are arranged (Step 203 in FIG. 14), and the adjacent refractive materials RP are joined (connected) to each other by welding or the like (see FIG. 14). In step 204), a half cross-sectional divided body is formed for the time being. In addition, separately prepared small assemblies (ribs) are installed on the inner peripheral surface of the half-section divided body at predetermined intervals (Step 205 in FIG. 14). After the half-section split bodies are formed, the two half-section split bodies are joined by welding or the like to form a polygonal cross-section split body (Step 206 in FIG. 14). Then, the column main body 110 is formed by axially connecting a plurality of (four stages in the drawing) divided bodies (Step 207 in FIG. 14). At this time, as shown in FIG. 6, it is preferable to connect the welding lines WL of the divided bodies adjacent to each other in the column axis direction so as to be discontinuous (in a zigzag arrangement).

Furthermore, a reduced-diameter body 120 formed in the same process as that for the column body 110 is attached to one end (upper end) of the column body 110 (Step 208 in FIG. 14), and a bottom plate 130 is attached so as to block the other end (lower end) of the column body 110. is fixed (Step 209 in FIG. 14) to complete the columnar floating body 100 of the present invention.

(Third embodiment)
FIG. 15 is a flow chart showing the main steps of the columnar floating body manufacturing method of the present invention in the third embodiment.

First, as in the first embodiment and the second embodiment, a facing material FP is cut out from a large steel plate as a base material (Step 301 in FIG. 15). When the facing material FP is cut out, the end (one end or both ends) of the facing material FP is bent to obtain a bent facing material BP having a "bending part SR" and a "flat part SF" ( Step 302 in FIG. 15). At this time, as described above, the bending is performed so that the bent portion SR has a predetermined central angle. Further, this bending step is repeated by the number of cut facing members FP. When the columnar floating body 100 is manufactured using the intermediate bending facing member BPM, the intermediate bending facing member BPM is obtained by bending the intermediate portion of the cut facing member FP (intermediate bending processing process). Of course, if there are two or more bending portions SR, only those portions are bent (bending step).

When the bending facing members BP are obtained, the bending facing members BP are arranged (Step 303 in FIG. 15), and the adjacent bending facing members BP are attached by welding or the like, as in the first and second embodiments. By joining (connecting) the BPs (Step 304 in FIG. 15), a half-section divided body is formed for the time being. In addition, separately prepared small assemblies (ribs) are installed on the inner peripheral surface of the half-section divided body at predetermined intervals (Step 305 in FIG. 15). After the half-section split bodies are formed, the two half-section split bodies are joined by welding or the like to form a split body with a chamfered polygonal cross section (Step 306 in FIG. 15). Then, the column body 110 is formed by axially connecting the plurality of divided bodies (Step 307 in FIG. 15).

Furthermore, a reduced-diameter body 120 formed in the same process as for the column body 110 is attached to one end (upper end) of the column body 110 (Step 308 in FIG. 15), and the bottom plate 130 is attached so as to block the other end (lower end) of the column body 110. is fixed (Step 309 in FIG. 15) to complete the columnar floating body 100 of the present invention.

The columnar floating body and the columnar floating body manufacturing method of the present invention can be particularly suitably used for floating offshore wind power generation in sea areas at a depth of 50 m or more. According to the present invention, since it is possible to construct a floating offshore wind power generation facility at low cost, it is possible to expect a more positive motivation for offshore wind power generation, which in turn reduces greenhouse gas emissions and is stable. Considering that energy can be supplied to a large extent, the present invention can be said to be an invention that can be expected not only to be industrially applicable but also to make a great contribution to society.

100 Columnar floating body of the present invention 110 (Columnary floating body) Column main body 120 (Columnary floating body) Reduced diameter body 130 (Columnary floating body) Bottom plate AT Arrangement jig BP Bending facing material BPM Intermediate bending facing material SF Plane part (of bent face plate or intermediate bent face plate) SR Bent part (of bent face plate or intermediate bent face plate) FP Face plate RP Refraction plate WL Welding line

Claims (7)

In a columnar floating body that constitutes a floating offshore wind power generation facility,
A pillar body, which is a hollow pillar,
The column body is formed by connecting a plurality of bending facing materials in the circumferential direction,
The bending facing member includes a flat portion and a bending portion formed at an end,
The cross-sectional shape of the column body is a polygon with a curved top,
A columnar floating body characterized by: In a columnar floating body that constitutes a floating offshore wind power generation facility,
A pillar body, which is a hollow pillar,
The column body is formed by connecting a plurality of bending facing materials in the circumferential direction,
The bending facing member includes two flat portions and a bending portion formed at a position sandwiched between the flat portions,
The cross-sectional shape of the column body is a polygon with a curved top,
A columnar floating body characterized by: In a columnar floating body that constitutes a floating offshore wind power generation facility,
A pillar body, which is a hollow pillar,
The column body is formed by connecting a plurality of bending facing materials in the circumferential direction,
The bent face member includes two or more bent portions,
The cross-sectional shape of the column body is a polygon with a curved top,
A columnar floating body characterized by: further comprising a diameter reducing body provided at one end of the column body,
The reduced-diameter body is formed by connecting a plurality of the bent facing members in the circumferential direction, and has a frustum shape with a cross-sectional area that decreases outward from the column body, and the cross-sectional shape is the same. It is similar to the cross-sectional shape of the pillar body,
The columnar floating body according to any one of claims 1 to 3, characterized in that: In a method for manufacturing a columnar floating body that constitutes a floating offshore wind power generation facility,
A cutting step of cutting out a facing material having a flat plate surface from the base material;
an end bending step of bending one end of the facing member to obtain a bent facing member including a flat portion and a bent portion;
an arranging step of arranging a plurality of the bending facing members against each other at a predetermined crossing angle;
a connecting step of connecting the bending facing members arranged by the arranging step by welding,
A column main body having a hollow columnar shape is manufactured by abutting the flat portion and the bent portion of the adjacent bent facing members and then connecting a plurality of the bent facing members in the circumferential direction. do,
A method for manufacturing a columnar floating body, characterized by: In a method for manufacturing a columnar floating body that constitutes a floating offshore wind power generation facility,
A cutting step of cutting out a facing material having a flat plate surface from the base material;
Bending an intermediate portion of the facing member to obtain a bent facing member including two flat portions and a bent portion formed between the flat portions by bending the intermediate portion of the facing member. process and
an arranging step of arranging a plurality of the bending facing members against each other;
a connecting step of connecting the bending facing members arranged by the arranging step by welding,
A hollow columnar shape is formed by abutting the flat portions of the adjacent bending facing members so that they are on the same or substantially the same surface, and then connecting the plurality of bending facing members in the circumferential direction. to manufacture a column body that is
A method for manufacturing a columnar floating body, characterized by: In a method for manufacturing a columnar floating body that constitutes a floating offshore wind power generation facility,
A cutting step of cutting out a facing material having a flat plate surface from the base material;
a bending step of obtaining a bent facing member including two or more bent portions by bending two or more portions of the facing member;
an arranging step of arranging a plurality of the bending facing members against each other;
a connecting step of connecting the bending facing members arranged by the arranging step by welding,
A column main body in the form of a hollow column is manufactured by abutting the ends of the adjacent bent facing members and then connecting a plurality of the bent facing members in the circumferential direction.
A method for manufacturing a columnar floating body, characterized by:

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