Floating Solar Power System

Abstract

To make an on-water solar power generation system hardly damaged.SOLUTION: An on-water solar power generation system includes: an island-like unit; solar cell modules; pillars; sliders; and mooring cables. The island-like unit includes floats floating on a water surface. The solar cell modules are fixed on the island-like unit. The pillars are fixed to a water bottom and also extending up to above the water surface. The sliders are positioned movably along a longitudinal direction of the pillars. The mooring cables connect the sliders and the island-like unit. The slider includes an annular portion having an inner space into which the pillar is inserted and an attachment object portion fixed to a first bottom portion positioned underwater on the island-like unit side in the annular portion and also attached with the mooring cable.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to floating solar power systems. [Background technology]

[0002] Photovoltaic power generation systems include floating photovoltaic power generation systems in which photovoltaic power generation equipment is installed on the surface of a lake or pond (see, for example, the description in Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-182061 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is room for improvement in floating solar power generation systems to make them less susceptible to damage. [Means for solving the problem]

[0005] A floating solar power system is disclosed.

[0006] One embodiment of the floating solar power generation system includes an island-shaped portion, a solar cell module, a column-shaped portion, a slider portion, and a mooring line. The island-shaped portion has a float floating on the water surface. The solar cell module is fixed on the island-shaped portion. The column-shaped portion is fixed to the bottom of the water and extends above the water surface. The slider portion is positioned in a state in which it can move along the longitudinal direction of the column-shaped portion. The mooring line connects the slider portion and the island-shaped portion. The slider portion includes an annular portion having an internal space through which the column-shaped portion is inserted, and an attachment portion fixed to a first lower portion of the annular portion located underwater on the island-shaped portion side and to which the mooring line is attached. The slider portion includes a protruding portion that is fixed to the first lower portion of the annular portion and is positioned so as to extend below the annular portion. The protruding portion includes the mounting portion. One aspect of the floating solar power generation system includes an island-shaped portion, a solar cell module, a column-shaped portion, a slider portion, and a mooring line. The island-shaped portion has a float floating on the water surface. The solar cell module is fixed on the island-shaped portion. The column-shaped portion is fixed to the bottom of the water and extends above the water surface. The slider portion is located in a state in which it can move along the longitudinal direction of the column-shaped portion. The mooring line connects the slider portion to the island-shaped portion. The slider portion includes an annular portion having an internal space through which the column-shaped portion is inserted, and an attachment portion that is fixed to a first lower portion of the annular portion that is located in the water on the island-shaped portion side and to which the mooring line is attached. The column-shaped portion includes at least one of an inclined portion whose longitudinal direction is inclined with respect to the vertical direction in a direction away from the island-shaped portion as it goes upward, and a stopper portion that is located above the annular portion and protrudes in a direction intersecting the longitudinal direction. One embodiment of the floating solar power generation system includes an island-shaped portion, a solar cell module, a column-shaped portion, a slider portion, a mooring line, a fixing portion, a reinforcing column-shaped portion, a second reinforcing line, and a third reinforcing line. The island-shaped portion has a float floating on the water surface. The solar cell module is fixed on the island-shaped portion. The column-shaped portion is fixed to the bottom of the water and extends above the water surface. The slider portion is positioned in a movable state along the longitudinal direction of the column-shaped portion. The mooring line connects the slider portion and the island-shaped portion. The fixing portion is fixed to land. The reinforcing column-shaped portion is fixed to the bottom of the water and extends above the water surface. The second reinforcing line is installed between the reinforcing column-shaped portion and the fixing portion. The third reinforcing rope is installed between a portion of the pillar-shaped portion located above the water surface and the reinforcing pillar-shaped portion. The slider portion includes an annular portion having an internal space through which the pillar-shaped portion is inserted, and an attachment portion fixed to a first lower portion of the annular portion located underwater on the island-shaped portion side and to which the mooring rope is attached. The fixing portion is fixed to a location on the land that is located on the opposite side of the island-shaped portion with the pillar-shaped portion and the reinforcing pillar-shaped portion in between. The reinforcing pillar-shaped portion is located on the opposite side of the island-shaped portion with the pillar-shaped portion in between. One embodiment of the floating solar power generation system includes an island-shaped portion, a solar cell module, a column-shaped portion, a slider portion, and a mooring line. The island-shaped portion has a float floating on the water surface. The solar cell module is fixed on the island-shaped portion. The column-shaped portion is fixed to the bottom of the water and extends above the water surface. The slider portion is located in a state where it can move along the longitudinal direction of the column-shaped portion. The mooring line connects the slider portion to the island-shaped portion. The slider portion includes an annular portion having an internal space through which the column-shaped portion is inserted, and an attachment portion fixed to a first lower portion of the annular portion located underwater on the island-shaped portion side and to which the mooring line is attached. One embodiment of the floating solar power generation system includes a plurality of the column-shaped portions located so as to surround the island-shaped portion, and a fourth reinforcing line. The plurality of column-shaped portions include a first column-shaped portion and a second column-shaped portion. The fourth reinforcing rope is installed between a portion of the first pillar portion that is located above the water surface and a portion of the second pillar portion that is located above the water surface. One embodiment of the floating solar power generation system includes an island-shaped portion, a solar cell module, a column-shaped portion, a slider portion, a mooring line, a fixing portion, and a first reinforcing rope. The island-shaped portion has a float floating on the water surface. The solar cell module is fixed on the island-shaped portion. The column-shaped portion is fixed to the bottom of the water and extends above the water surface. The slider portion is located in a movable state along the longitudinal direction of the column-shaped portion. The mooring rope connects the slider portion and the island-shaped portion. The fixing portion is fixed to a location on the land that is located on the opposite side of the island-shaped portion across the column-shaped portion. The first reinforcing rope is installed between a portion of the column-shaped portion that is located above the water surface and the fixing portion. The slider portion includes an annular portion having an internal space through which the columnar portion is inserted, and an attachment portion fixed to a first lower portion of the annular portion located underwater on the island-shaped portion side and to which the mooring line is attached. One embodiment of the floating solar power generation system includes an island-shaped portion, a solar cell module, a columnar portion, a slider portion, and a mooring line. The island-shaped portion has a float floating on the water surface. The solar cell module is fixed on the island-shaped portion. The columnar portion is fixed to the bottom of the water and extends above the water surface. The slider portion is located in a state where it can move along the longitudinal direction of the columnar portion. The mooring line connects the slider portion to the island-shaped portion. The slider portion includes an annular portion having an internal space through which the columnar portion is inserted, and an attachment portion fixed to a first lower portion of the annular portion located in the water on the island-shaped portion side and to which the mooring line is attached. The first lower portion is a portion of the lower region located at the lowest side of the annular portion when the annular portion is divided into M equal parts in the vertical direction (M is a natural number of 3 or more). Effect of the Invention

[0007] For example, floating solar power generation systems are less likely to be damaged. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view illustrating an example of the external appearance of a floating solar power generation system according to a first embodiment. [Diagram 2] FIG. 2 is a plan view illustrating a schematic example of the configuration of the island-shaped portion. [Diagram 3] FIG. 3 is a plan view showing a schematic example of a state in which a solar cell module is fixed to an island-shaped portion. [Figure 4] FIG. 4 is a cross-sectional view illustrating a schematic example of the configuration of a floating solar power generation system according to the first embodiment. [Diagram 5] FIG. 5 is a cross-sectional view showing a modified example of the manner in which the pillar-shaped portion is fixed to the bottom of the water. [Figure 6] FIG. 6 is an enlarged plan view showing a schematic diagram of a portion VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view that shows a schematic configuration example of a virtual cross section of the slider portion and the columnar portion taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view showing an example of how sudden movement of the slider portion relative to the columnar portion is stopped by friction in a virtual cross section taken along line VII-VII in FIG. [Figure 9] FIG. 9 is a cross-sectional view showing a schematic configuration example of a virtual cross section corresponding to the virtual cross section taken along line VII-VII in FIG. 6 of the columnar section and slider section according to the second embodiment. [Figure 10]FIG. 10 is a cross-sectional view showing an example of how sudden movement of the slider portion relative to the columnar portion is stopped by friction at a virtual cross section corresponding to the virtual cross section taken along line VII-VII in FIG. 6 of the columnar portion and slider portion according to the second embodiment. [Figure 11] FIG. 11 is a cross-sectional view that illustrates a schematic configuration example of a virtual cross section of a columnar section and a slider section according to the third embodiment, the virtual cross section corresponding to the virtual cross section taken along line VII-VII in FIG. [Figure 12] FIG. 12 is a cross-sectional view showing an example of how sudden movement of the slider portion relative to the columnar portion is stopped by friction at a virtual cross section corresponding to the virtual cross section taken along line VII-VII in FIG. 6 of the columnar portion and slider portion according to the third embodiment. [Figure 13] FIG. 13 is a cross-sectional view that illustrates a schematic configuration example of a virtual cross section of a columnar section and a slider section according to the fourth embodiment, the virtual cross section corresponding to the virtual cross section taken along line VII-VII in FIG. [Figure 14] FIG. 14 is a cross-sectional view showing an example of how sudden movement of the slider portion relative to the columnar portion is stopped by friction at a virtual cross section corresponding to the virtual cross section taken along line VII-VII in FIG. 6 of the columnar portion and slider portion according to the fourth embodiment. [Figure 15] FIG. 15 is a cross-sectional view that illustrates a schematic configuration example of a floating solar power generation system according to the fifth embodiment. [Figure 16] FIG. 16 is an enlarged plan view illustrating a schematic view of a portion of the floating solar power generation system according to the fifth embodiment, which corresponds to portion VI in FIG. [Figure 17] FIG. 17 is a cross-sectional view that illustrates an example of a virtual cross section of the slider portion, the columnar portion, and the floating body portion taken along the line XVII-XVII in FIG. [Figure 18] FIG. 18 is a cross-sectional view showing an example of how sudden movement of the slider portion relative to the columnar portion is stopped by friction in a virtual cross section taken along line XVII-XVII in FIG. [Figure 19]FIG. 19 is a plan view illustrating a first example of the configuration of a slider portion and a columnar portion according to the sixth embodiment. [Figure 20] FIG. 20 is a plan view illustrating a first example of the configuration of the slider portion and the columnar portion according to the sixth embodiment. [Figure 21] FIG. 21 is a plan view illustrating a second example of the configuration of the slider portion and the columnar portion according to the sixth embodiment. [Figure 22] FIG. 22 is a plan view illustrating a second example of the configuration of the slider portion and the columnar portion according to the sixth embodiment. [Figure 23] FIG. 23 is a plan view illustrating an example of the appearance of a floating solar power generation system according to the seventh embodiment. [Figure 24] FIG. 24 is a cross-sectional view illustrating a schematic example of the configuration of a floating solar power generation system according to the seventh embodiment. [Diagram 25] FIG. 25 is a cross-sectional view that illustrates a schematic configuration of a floating solar power generation system according to a reference example. [Figure 26] FIG. 26 is a cross-sectional view showing a schematic configuration of a floating solar power generation system according to a reference example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Floating solar power generation systems, in which solar power generation equipment is installed on the surface of a lake or pond, are becoming increasingly popular.

[0010] This floating solar power generation system has a configuration in which a float on which a solar cell module is mounted is floated on the water surface. The solar cell module is installed on the float at an inclination angle according to the angle of incidence of sunlight. Then, for example, by connecting multiple floats each equipped with a solar cell module, a large-scale floating solar power generation system called a floating mega solar power generation system is realized.

[0011] In this floating solar power generation system, the float is tethered to land or the bottom of the water using anchor stakes and wires (also called mooring lines) to prevent the float from capsizing or colliding due to rippling and up-and-down movement of the water surface caused by wind, as well as wind pressure.

[0012] However, the amount of precipitation increases or decreases depending on factors such as the season, and the water level of lakes and ponds may rise or fall. For example, in a dam lake, the water level differs greatly between when it is low and when it is full. For this reason, the fluctuation in the water level may cause the mooring rope connecting the anchor pile and the float to become loose.

[0013] Each of Fig. 25 and Fig. 26 shows a floating solar power generation system 900 according to a reference example in which a plurality of solar cell modules 902 are installed on an island portion (also called an island-shaped portion) 901 to which a plurality of floats 911 floating on the water surface 700s are connected. In the example of Fig. 25 and Fig. 26, an anchor pile 903 provided on the bottom 700b and the float 911 are connected by a mooring line 905. Fig. 25 shows the state of the floating solar power generation system 900 when the water level is high, and Fig. 26 shows the state of the floating solar power generation system 900 when the water level is low. In this case, for example, as shown in Fig. 25, when the water level rises, the slack of the mooring line 905 decreases. On the other hand, as shown in Fig. 26, when the water level drops, the slack of the mooring line 905 increases.

[0014] Also, for example, if an anchor pile fixed on land and a float are connected by a mooring line, when the water level drops, the slack in the mooring line decreases, and when the water level rises, the slack in the mooring line increases.

[0015] For example, when the mooring lines are largely slack, if the floats swing significantly due to strong winds and high waves, the solar cell modules may be damaged due to collisions between the floats and with other structures. Also, for example, when the mooring lines are largely slack, if the floats swing significantly due to strong winds and high waves, a large load may be applied locally to the connection between the floats and the mooring lines and the connection between the floats, causing damage. Also, for example, when the mooring lines are largely slack, if the floats swing significantly due to strong winds and high waves, the floats may capsize.

[0016] For this reason, there is room for improvement in floating solar power generation systems in terms of making them less susceptible to damage.

[0017] Therefore, the inventors of the present disclosure have created a technology that can make floating solar power generation systems less susceptible to damage.

[0018] In the following, various embodiments will be described with reference to the drawings. In the drawings, parts having similar configurations and functions are given the same reference numerals, and duplicated explanations will be omitted in the following description. The drawings are schematic. A right-handed XYZ coordinate system is attached to Figs. 1 to 26. In this XYZ coordinate system, a first horizontal direction (also called the first horizontal direction) is the +X direction, a second horizontal direction (also called the second horizontal direction) perpendicular to the +X direction is the +Y direction, and a vertical direction (also called the gravity direction) perpendicular to both the +X direction and the +Y direction is the -Z direction.

[0019] <1. First embodiment> A floating solar power generation system 100 according to a first embodiment will be described with reference to Figs. 1 to 8.

[0020] The floating solar power generation system 100 is, for example, a solar power generation system in which solar power generation equipment is installed on the water surface 700s of a lake or pond surrounded by land 800. In Figs. 1 to 3 and 6, the water surface 700s is hatched with sand. In Figs. 4, 5, 7 and 8, the parts where water exists are hatched with sand. Lakes include, for example, artificial lakes such as dam lakes and natural lakes. Dam lakes are artificial lakes created by damming a river with a dam. Ponds include, for example, artificial ponds such as reservoirs and storage ponds, and natural ponds.

[0021] 1, the floating solar power generation system 100 includes, for example, an island portion 1, a solar cell module 2, a pillar portion 3, a slider portion 4, and a mooring line 5. The pillar portion 3, the slider portion 4, and the mooring line 5 are portions for mooring the island portion 1.

[0022] The island-shaped portion 1 has, for example, a float 11 floating on the water surface 700s. In the first embodiment, the island-shaped portion 1 has a plurality of floats 11. For example, a hollow resin float or a polystyrene foam float is applied to the float 11. For example, the plurality of floats 11 are in a state in which adjacent floats 11 are connected to each other. For example, each of the plurality of floats 11 has an annular connection portion (also called a connection tab) protruding from the four corners when viewed in a plan view. In this case, the connection between the floats 11 is realized by connecting the connection tabs to each other via, for example, a spreader bar and a connection pin. The connection between the floats 11 may be realized by various connection members such as a rope or a chain, or may be realized by the engagement or fitting of the floats 11 to each other.

[0023] 2, the plurality of floats 11 include a plurality of first floats 111 and a plurality of second floats 112. For example, the first float 111 is a float 11 to which the solar cell module 2 is fixed. For example, the second float 112 is an auxiliary float 11 for stably floating the first float 111 on the water surface 700s. The second float 112 may also function as a passage for inspection.

[0024] For example, the plurality of first floats 111 are composed of a first predetermined number of rows of the first floats 111 arranged along the +Y direction as the second horizontal direction. The rows of the first floats 111 are composed of a first predetermined number of first floats 111 arranged along the +X direction as the first horizontal direction, for example. For example, the plurality of second floats 112 are composed of a second predetermined number of rows of the second floats 112 arranged along the +Y direction as the second horizontal direction. The rows of the second floats 112 are composed of a second predetermined number of second floats 112 that are connected to each other and arranged along the +X direction as the first horizontal direction, for example. In the example of FIG. 1 and FIG. 2, the first predetermined number of rows is 6 rows, the first predetermined number is 6, the second predetermined number is 7, and the second predetermined number is 13. In other words, the plurality of first floats 111 are arranged in a matrix of 6×6, and the plurality of second floats 112 are arranged in a matrix of 13×7.

[0025] More specifically, in the example of Figures 1 and 2, the first row of second floats 112, the first row of first floats 111, the second row of second floats 112, the second row of first floats 111, the third row of second floats 112, the third row of first floats 111, the fourth row of second floats 112, the fourth row of first floats 111, the fifth row of second floats 112, the fifth row of first floats 111, the sixth row of second floats 112, the sixth row of first floats 111, and the seventh row of second floats 112 are lined up in the -Y direction in the order shown.

[0026] The solar cell module 2 is fixed, for example, on an island-shaped portion 1. In other words, the floating solar power generation system 100 has a float (also called a solar cell float) 10 on which the solar cell module 2 is fixed on the island-shaped portion 1. In the first embodiment, a plurality of solar cell modules 2 are fixed on the island-shaped portion 1. In other words, the floating solar power generation system 100 has a solar cell float 10 on which a plurality of solar cell modules 2 are fixed on the island-shaped portion 1. In the example of FIG. 1, as shown in FIG. 2 and FIG. 3, one solar cell module 2 is fixed on one first float 111. In the example of FIG. 1 and FIG. 3, a plurality of solar cell modules 2 are arranged in a matrix of 6×6. The solar cell module 2 is fixed, for example, to a metal fitting provided on the first float 111 at an inclination angle according to the angle of incidence of sunlight.

[0027] The columnar portion 3 is fixed to the bottom 700b of the water as shown in FIG. 4, for example, and extends above the water surface 700s. The bottom 700b of the water includes, for example, the ground at the bottom of a lake or a pond. The columnar portion 3 is, for example, a rod-shaped or tubular member having a shape extending linearly upward from the bottom 700b of the water. The columnar portion 3 has a longitudinal direction along the up-down direction. In the first embodiment, the floating solar power generation system 100 includes a plurality of columnar portions 3. In the example of FIG. 1, the plurality of columnar portions 3 are positioned so as to surround the solar cell float 10. The columnar portion 3 is, for example, a rod-shaped or tubular member.

[0028] The material of the columnar part 3 is, for example, a water-resistant material such as resin and ceramic. The ceramic includes, for example, cement and concrete. When the columnar part 3 is tubular, it may have a structure in which water can be introduced into the hollow part. More specifically, the columnar part 3 is, for example, a corrosion-resistant steel pipe in which the outer circumferential surface of a steel pipe is covered with a protective layer such as polyethylene, urethane elastomer, or fiber-reinforced plastic (FRP). The steel pipe is, for example, a plated steel pipe in which the surface of an iron pipe is covered with a hot-dip galvanized layer. Examples of corrosion-resistant steel pipes include a pipe in which the outer circumferential surface of a steel pipe is covered with a special surface treatment layer, a polyethylene adhesive layer, and a polyethylene corrosion layer in this order, and a pipe in which the outer circumferential surface of a steel pipe is covered with a primer layer and a urethane elastomer layer in this order.

[0029] The outer peripheral surface of the columnar section 3 may be coated with an antifouling paint for inhibiting biological fouling, such as the attachment or growth of aquatic organisms, such as aquatic plants and crustaceans. For example, the antifouling paint is a paint that is toxic or repellent to aquatic organisms (also called sessile organisms) that may attach to the outer peripheral surface of the columnar section 3. The sessile organisms that live in freshwater areas, such as lakes or ponds, may include bivalve shells, such as Limnoperna fortunei and Corbicula formosanus, marine sponges, and insects, such as caddisfly larvae.

[0030] Specific examples of antifouling paints include hydrolysis type antifouling paints, disintegration type / hydration decomposition type antifouling paints, and silicone-based antifouling paints. For example, hydrolysis type antifouling paints contain a hydrolysis resin made of a high molecular weight polymer and an antifouling agent, and are paints for preventing biological fouling by gradually releasing the antifouling agent while the coating film gradually dissolves in water to renew the surface. For example, disintegration type / hydration decomposition type antifouling paints use a resin that has affinity or slight solubility for water, and are paints for preventing biological fouling by forming a hydration layer on the coating film surface as water penetrates the coating film and gradually releasing the antifouling agent into the water. For example, silicone-based antifouling paints are antifouling paints that are mainly composed of silicone rubber and have the property of being difficult to adhere, which makes it easy for attached organisms to fall off due to the elasticity, water repellency, and smoothness of the coating film. The antifouling effect of silicone-based antifouling paints may be improved by further adding an antifouling agent.

[0031] Furthermore, for example, a portion of the direct current generated in the solar cell module 2 may be applied to the columnar portion 3 in order to suppress corrosion of the columnar portion 3 or biological fouling caused by attached organisms.

[0032] The pillar-shaped portion 3 is fixed to the bottom of the water 700b, for example, by driving it into the ground of the bottom of the water 700b. Here, for example, as shown in Fig. 5, the pillar-shaped portion 3 may be fixed to the bottom of the water 700b by embedding the lower end portion of the pillar-shaped portion 3 in a concrete foundation portion 3b installed on the ground of the bottom of the water 700b. Also, for example, as shown in Fig. 5, the pillar-shaped portion 3 may be fixed to the bottom of the water 700b by pulling the lower end portion of the pillar-shaped portion 3 from three or more directions with a stake-shaped anchor member and wires embedded in the ground of the bottom of the water 700b.

[0033] The slider portion 4 is positioned, for example, in a state in which it can move along the longitudinal direction of the columnar portion 3. In the first embodiment, the floating solar power generation system 100 includes a plurality of slider portions 4. The slider portion 4 is disposed for each of the plurality of columnar portions 3.

[0034] The slider portion 4 has an annular portion 41 and a mounting portion 42, for example, as shown in FIGS.

[0035] The annular portion 41 is an annular portion having an internal space 41h through which the columnar portion 3 is inserted. In the first embodiment, the annular portion 41 has, for example, a through hole 41th penetrating the annular portion 41 along the up-down direction. For example, a circular outer shape is applied to the outer shape of the annular portion 41. The through hole 41th has, for example, a cylindrical internal space 41h. The through hole 41th has an inner diameter D2 larger than the outer diameter D1 of the columnar portion 3. For this reason, for example, in the internal space 41h in the through hole 41th, a gap 41sp exists between the outer periphery 3os of the columnar portion 3 and the inner periphery 41is of the annular portion 41. The inner periphery 41is is a portion of the annular portion 41 that forms the through hole 41th, and is located so as to surround the internal space 41h.

[0036] In the first embodiment, the annular portion 41 is a float floating on the water surface 700s. Therefore, the annular portion 41 can move along the longitudinal direction of the columnar portion 3 in response to the rise and fall of the water level. As a result, for example, the island-shaped portion 1 can move gently up and down in response to the fluctuation of the water level, and the slider portion 4 can move gently up and down along the longitudinal direction of the columnar portion 3. At this time, for example, the distance between the island-shaped portion 1 and the slider portion 4 hardly changes. As a result, for example, the mooring line 5 is unlikely to slacken, and the float 11 is unlikely to swing significantly due to strong winds and high waves. Therefore, for example, collisions between the floats 11, collisions between the floats 11 and other structures, application of a large load locally to the portion connecting the floats 11 and the portion of the float 11 to which the mooring line 5 is attached, and capsizing of the float 11 are unlikely to occur.

[0037] The annular portion 41 may be, for example, a float having a main body portion forming an outer surface with a hollow portion. A gas such as air or a material having a specific gravity smaller than that of water, such as a foam material, is disposed in the hollow portion. The main body portion of the annular portion 41 may be made of a material such as a resin or a metal. When the specific gravity of the main body portion is smaller than that of water, the annular portion 41 may be, for example, a tank containing a liquid such as water in the hollow portion.

[0038] When metal is applied to the material of the main body of the annular portion 41, the outer surface of the metallic main body may be covered with a protective layer such as polyethylene, urethane elastomer, or fiber-reinforced plastic (FRP). The metallic main body may be produced using, for example, a plated steel sheet with a hot-dip galvanized layer or the like on its surface. The outer surface of the annular portion 41 may be coated with an antifouling paint or the like for suppressing biological fouling such as the attachment or growth of aquatic organisms such as aquatic plants and crustaceans. For example, the antifouling paint is a paint that is toxic or repellent to aquatic organisms (attaching organisms) that may attach to the outer surface of the annular portion 41. Specific examples of the antifouling paint include hydrolysis type antifouling paint, disintegration type / hydration decomposition type antifouling paint, and silicone-based antifouling paint.

[0039] The attached portion 42 is a portion to which the mooring line 5 is attached. The attached portion 42 is fixed to a lower portion (also referred to as a first lower portion) 411 of the annular portion 41 located underwater on the island-shaped portion 1 side. Here, for example, if the annular portion 41 is divided into three equal portions in the vertical direction, the annular portion 41 has an upper region 41u, a middle region 41m, and a lower region 41b, in that order from the top. For example, if the annular portion 41 is divided into M equal portions (M is a natural number of 3 or more) in the vertical direction, the portion located at the lowest position may be the lower region 41b. For example, the first lower portion 411 is applied to a portion of the lower region 41b of the annular portion 41 on the island-shaped portion 1 side. For example, the portion of the annular portion 41 on the island-shaped portion 1 side is applied to a portion of the annular portion 41 located between the internal space 41h of the annular portion 41 and the float 11 to which the mooring line 5 connected to the annular portion 41 is connected, when viewed in a plan view. Also, for example, the part of the annular portion 41 on the island-shaped portion 1 side may be a part of the annular portion 41 that is located between the internal space 41h of the annular portion 41 and a part of the mooring line 5 connected to the annular portion 41 that is connected to the float 11 when viewed in a plan view. Also, for example, the part of the annular portion 41 on the island-shaped portion 1 side may be a part of the annular portion 41 that is located between the columnar portion 3 that passes through the internal space 41h of the annular portion 41 and the float 11 to which the mooring line 5 connected to the annular portion 41 is connected when viewed in a plan view. Also, for example, the part of the annular portion 41 on the island-shaped portion 1 side may be a part of the annular portion 41 that is located between the center of the internal space 41h of the annular portion 41 and the float 11 to which the mooring line 5 connected to the annular portion 41 is connected when viewed in a plan view. Furthermore, for example, the part of the annular portion 41 on the island-shaped portion 1 side may be, when viewed in a plane, a part of the annular portion 41 that is located between the center of the internal space 41h of the annular portion 41 and the part where the mooring line 5 connected to the annular portion 41 is connected to the float 11.

[0040] The attached portion 42 may be, for example, integrally formed from the same material as the annular portion 41, or may be a member such as a metal fitting fixed to the annular portion 41 by fitting, engaging, joining, or the like. The attached portion 42 may be, for example, a part or member having a through hole for attaching the mooring rope 5.

[0041] The mooring line 5 connects, for example, the slider portion 4 and the island portion 1. From another perspective, the mooring line 5 is, for example, a line (also called a mooring line) for mooring the solar cell float 10 to the column portion 3. For example, a line having various forms such as a string-like, rope-like, or chain-like form is applied to the mooring line 5. In the first embodiment, the floating solar power generation system 100 includes a plurality of mooring lines 5. In the example of FIG. 1, each of the plurality of slider portions 4 and the island portion 1 are connected by the mooring line 5. The mooring line 5 has, for example, a first end attached to the slider portion 4 and a second end attached to the island portion 1. For example, the first end of the mooring line 5 is attached to the attachment portion 42 of the slider portion 4. More specifically, for example, the first end of the mooring line 5 is attached to a through hole of the attachment portion 42 by a member such as a shackle. The second end of the mooring line 5 is attached to, for example, a spreader bar used to connect the floats 11 to each other. More specifically, for example, the second end of the mooring line 5 is attached to a through hole of the spreader bar by a member such as a shackle. Also, for example, as shown in FIG. 4, the second end of the mooring line 5 is located relatively higher than the first end of the mooring line 5. For this reason, as shown in FIG. 4 and FIG. 7, the mooring line 5 is arranged to extend obliquely upward from the first end to the second end. In the example of FIG. 4, the second end of the mooring line 5 is located above the water surface 700s. The first end of the mooring line 5 is located below the water surface 700s.

[0042] For example, wire rope, chain, fiber rope, etc. may be applied to the mooring rope 5. For example, stainless steel having excellent corrosion resistance may be applied to the wire rope and chain. For example, a cable coated with a resin such as polyvinyl chloride may be applied to the wire rope. This may increase the corrosion resistance of the wire rope. For example, nylon, polyester, or polyethylene may be applied to the fiber rope. There are many types of fiber ropes with different conditions such as weaving method, material, and size. For this reason, for example, a fiber rope having desired performance may be selected from many types of fiber ropes and applied to the mooring rope 5. For example, the mooring rope 5 may have a structure in which two or more types of fiber ropes are connected, or a structure in which two or more types of ropes among wire rope, chain, and fiber rope are connected. As a specific example, for example, a structure in which a chain and a cable are connected by a member such as a shackle in order from the float 11 side may be applied to the mooring rope 5. In this case, for example, the chain is used as a part for adjusting the length of the mooring rope 5. For example, the cable has ring-shaped connection parts at both ends.

[0043] Here, for example, it is assumed that the mooring rope 5 is pulled quickly along the longitudinal direction of the mooring rope 5. In other words, for example, it is assumed that the attached portion 42 fixed to the lower portion 411 of the annular portion 41 is pulled quickly along the longitudinal direction of the mooring rope 5. In this case, for example, as shown in FIG. 8, the outer diameter D1 of the columnar portion 3 and the inner diameter D2 of the through hole 41th are set so that an upper corner portion (also called a first corner portion) C1 on the island-shaped portion 1 side of the inner circumferential portion 41is of the annular portion 41 and a lower corner portion (also called a second corner portion) C2 on the opposite side to the island-shaped portion 1 side of the inner circumferential portion 41is of the annular portion 41 can abut against the outer circumferential portion 3os of the columnar portion 3. Here, for example, when the length L1 of the through hole 41th in the direction in which the through hole 41th penetrates the annular portion 41 is relatively small, the difference between the outer diameter D1 and the inner diameter D2 is set to a relatively small value. For example, when the length L1 is relatively large, the difference between the outer diameter D1 and the inner diameter D2 can be set to a relatively large value. For example, tan -1{(D2-D1) / L1} may be set to about 5 degrees to 40 degrees, or tan -1 {(D2-D1) / L1} may be set to about 15 degrees to 30 degrees.

[0044] In addition, here, the portion of the annular portion 41 opposite to the island-shaped portion 1 side is, for example, a portion of the annular portion 41 located on the opposite side of the float 11 to which the mooring line 5 connected to the annular portion 41 is connected, across the internal space 41h of the annular portion 41, when viewed in a plan view. Also, for example, the portion of the annular portion 41 opposite to the island-shaped portion 1 side may be a portion of the annular portion 41 located on the opposite side of the float 11 to which the mooring line 5 connected to the annular portion 41 is connected, across the internal space 41h of the annular portion 41, when viewed in a plan view. Also, for example, the portion of the annular portion 41 opposite to the island-shaped portion 1 side may be a portion of the annular portion 41 located on the opposite side of the float 11 to which the mooring line 5 connected to the annular portion 41 is connected, across the columnar portion 3 that passes through the internal space 41h of the annular portion 41, when viewed in a plan view. Also, for example, the portion of the annular portion 41 opposite the island-shaped portion 1 side may be a portion of the annular portion 41 located on the opposite side to the float 11 to which the mooring line 5 connected to the annular portion 41 is connected, across the center of the internal space 41h of the annular portion 41, when viewed in a plan view. Also, for example, the portion of the annular portion 41 opposite the island-shaped portion 1 side may be a portion of the annular portion 41 located on the opposite side to the portion to which the mooring line 5 connected to the annular portion 41 is connected to the float 11, across the center of the internal space 41h of the annular portion 41, when viewed in a plan view.

[0045] Here, for example, a case is assumed in which the float 11 tries to swing violently due to the solar cell module 2 being blown up by a gust of wind and waves, and the float 11 suddenly pulls the mooring line 5. In this case, for example, as shown in FIG. 8, the mooring line 5 suddenly pulls the first lower part 411 on the island part 1 side of the ring-shaped part 41, causing the ring-shaped part 41 to tilt with respect to the columnar part 3, and the first corner part C1 and the second corner part C2 on the inner periphery side of the ring-shaped part 41 come into contact with the outer periphery part 3os of the columnar part 3 in a pressed state. As a result, for example, the first corner part C1 and the second corner part C2 of the ring-shaped part 41 are caught by friction against the outer periphery part 3os of the columnar part 3. For this reason, for example, resistance is generated against a sudden movement (also called vertical movement) of the ring-shaped part 41 along the vertical direction as the longitudinal direction of the columnar part 3. As a result, for example, the state in which the mooring line 5 pulls the float 11 is maintained, and the float 11 is less likely to swing. Therefore, for example, collisions between the floats 11, application of a large load locally to the portion connecting the floats 11 and the portion of the float 11 to which the mooring line 5 is attached, and other problems such as capsizing of the float 11 are less likely to occur. Therefore, for example, the floating solar power generation system 100 is less likely to be damaged. In Fig. 8, the direction in which the mooring line 5 is pulled is indicated by a straight arrow drawn with a two-dot chain line, and the direction in which the annular portion 41 tilts is indicated by an arc-shaped arrow drawn with a two-dot chain line.

[0046] <<Summary of the First Embodiment>> In the floating solar power generation system 100 according to the first embodiment, for example, the slider part 4 connected to the mooring line 5 connected to the island part 1 is in a state in which it can move along the longitudinal direction of the columnar part 3. As a result, for example, the island part 1 moves gently up and down in response to fluctuations in the water level, and the slider part 4 can move gently up and down along the longitudinal direction of the columnar part 3, so the distance between the island part 1 and the slider part 4 remains almost constant. As a result, for example, the mooring line 5 is unlikely to slacken, and the float 11 is unlikely to swing significantly due to strong winds and high waves. Therefore, for example, collisions between the floats 11, collisions between the floats 11 and other structures, application of large local loads to the parts connecting the floats 11 and the parts of the floats 11 to which the mooring line 5 is attached, and capsizing of the float 11 are unlikely to occur.

[0047] Further, for example, the slider part 4 has an annular part 41 having an internal space 41h through which the columnar part 3 is inserted, and an attached part 42 fixed to a first lower part 411 of the annular part 41 on the island part 1 side located underwater and to which the mooring line 5 is attached. With this configuration, for example, when the float 11 tries to swing violently due to the solar cell module 2 being blown up by a gust of wind and waves, the float 11 suddenly pulls the mooring line 5, and the mooring line 5 suddenly pulls the first lower part 411 of the annular part 41 on the island part 1 side. As a result, for example, the annular part 41 is inclined with respect to the columnar part 3, and the first corner part C1 and the second corner part C2 on the inner periphery side of the annular part 41 are pressed against the outer periphery part 3os of the columnar part 3 and come into contact with each other. As a result, for example, the first corner part C1 and the second corner part C2 of the annular part 41 are caught by friction against the outer periphery part 3os of the columnar part 3. For this reason, for example, resistance is generated against sudden vertical movement of the annular portion 41 along the longitudinal direction of the columnar portion 3, and the state in which the mooring line 5 pulls the float 11 is maintained, making it difficult for the float 11 to swing. Therefore, for example, problems such as collisions between the floats 11, application of large local loads to the portions connecting the floats 11 and the portions of the floats 11 to which the mooring line 5 is attached, and capsizing of the floats 11 are unlikely to occur. Therefore, for example, the floating solar power generation system 100 is unlikely to be damaged.

[0048] <2. Other embodiments> The present disclosure is not limited to the first embodiment described above, and various modifications and improvements are possible without departing from the gist of the present disclosure.

[0049] <2-1. Second embodiment> In the first embodiment, for example, as shown in Fig. 9, each of the first corner C1 and the second corner C2 may be a convex portion (also called a sharp portion) whose cross-sectional shape along the up-down direction as the longitudinal direction of the columnar portion 3 forms an acute angle. In other words, for example, the annular portion 41 may have a sharp portion at each of the first corner C1 and the second corner C2. The sharp portion may be formed, for example, by cutting the main body portion of the annular portion 41, molding the main body portion of the annular portion 41 with resin, or attaching a part that constitutes a sharp portion to the main body portion of the annular portion 41.

[0050] Here, for example, a case is assumed in which the float 11 tries to swing violently due to the upward blowing of the solar cell module 2 by a gust of wind and waves, and the float 11 suddenly pulls the mooring line 5. In this case, for example, as shown in FIG. 10, the mooring line 5 suddenly pulls the first lower part 411 of the ring-shaped part 41 on the island part 1 side, so that the ring-shaped part 41 is inclined with respect to the columnar part 3, and the first corner part C1 and the second corner part C2 on the inner circumference side of the ring-shaped part 41 come into contact with the outer circumference part 3os of the columnar part 3 in a pressed state. Here, for example, if the first corner part C1 and the second corner part C2 are sharp-pointed parts, the force with which the first corner part C1 and the second corner part C2 of the ring-shaped part 41 are caught by the outer circumference part 3os of the columnar part 3 due to friction becomes large. For this reason, for example, resistance to sudden vertical movement of the ring-shaped part 41 along the longitudinal direction of the columnar part 3 can be increased. As a result, for example, the state in which the mooring line 5 pulls the float 11 is likely to be maintained, and the float 11 is unlikely to swing. Therefore, for example, collisions between the floats 11, application of a large load locally to the portion connecting the floats 11 and the portion of the float 11 to which the mooring line 5 is attached, and other problems such as capsizing of the float 11 are unlikely to occur. Therefore, for example, the floating solar power generation system 100 is unlikely to be damaged. In Fig. 10, the direction in which the mooring line 5 is pulled is indicated by a straight arrow drawn with a two-dot chain line, and the direction in which the annular portion 41 tilts is indicated by an arc-shaped arrow drawn with a two-dot chain line.

[0051] Here, for example, at least one of the first corner portion C1 and the second corner portion C2 may be a sharp-pointed portion. In other words, for example, the annular portion 41 may have a sharp-pointed portion at at least one of the first corner portion C1 and the second corner portion C2.

[0052] <2-2. Third embodiment> In the first embodiment, for example, as shown in Fig. 11, each of the first corner C1 and the second corner C2 may be an uneven portion. In other words, for example, the annular portion 41 may have an uneven portion at each of the first corner C1 and the second corner C2. The uneven portion may be formed, for example, by grinding, cutting, or dissolving the main body portion of the annular portion 41, resin molding the main body portion of the annular portion 41, or spraying granular material onto the surface of the main body portion of the annular portion 41.

[0053] 11, an edge portion (also called an upper edge portion) 41ue constituting the upper opening of the through hole 41th of the annular portion 41 and an edge portion (also called a lower edge portion) 41be constituting the lower opening of the through hole 41th each have a tapered inclined portion as if they were chamfered. The first corner portion C1 constitutes a part of the upper edge portion 41ue, and the second corner portion C2 constitutes a part of the lower edge portion 41be. The tapered inclined portion is, for example, a portion that is inclined so that the inner diameter of the through hole 41th narrows toward the back of the through hole 41th.

[0054] Here, for example, a case is assumed in which the float 11 tries to swing violently due to the solar cell module 2 being blown up by a gust of wind and waves, and the float 11 suddenly pulls the mooring line 5. In this case, for example, as shown in FIG. 12, the mooring line 5 suddenly pulls the first lower part 411 of the ring-shaped part 41 on the island part 1 side, so that the ring-shaped part 41 is inclined with respect to the columnar part 3, and the first corner part C1 and the second corner part C2 on the inner periphery side of the ring-shaped part 41 come into contact with the outer periphery part 3os of the columnar part 3 in a pressed state. Here, for example, if the first corner part C1 and the second corner part C2 are uneven parts, the force with which the first corner part C1 and the second corner part C2 of the ring-shaped part 41 are caught by the outer periphery part 3os of the columnar part 3 due to friction becomes large. For this reason, for example, the resistance to the sudden vertical movement of the ring-shaped part 41 along the longitudinal direction of the columnar part 3 can be increased. As a result, for example, the state in which the mooring line 5 pulls the float 11 is likely to be maintained, and the float 11 is unlikely to swing. Therefore, for example, collisions between the floats 11, application of a large load locally to the portion connecting the floats 11 and the portion of the float 11 to which the mooring line 5 is attached, and other problems such as capsizing of the float 11 are unlikely to occur. Therefore, for example, the floating solar power generation system 100 is unlikely to be damaged. In Fig. 12, the direction in which the mooring line 5 is pulled is indicated by a straight arrow drawn with a two-dot chain line, and the direction in which the annular portion 41 tilts is indicated by an arc-shaped arrow drawn with a two-dot chain line.

[0055] Here, for example, at least one of the first corner portion C1 and the second corner portion C2 may be an uneven portion. In other words, for example, the annular portion 41 may have an uneven portion at at least one of the first corner portion C1 and the second corner portion C2.

[0056] Here, for example, at least one of the first corner C1 and the second corner C2 may be provided with a member (also referred to as a high-friction member) whose surface generates a larger frictional force than the portion other than the first corner C1 or the second corner C2 of the annular portion 41. In other words, for example, at least one of the first corner C1 and the second corner C2 of the annular portion 41 may have a high-friction member whose surface generates a larger frictional force than the remaining portion of the annular portion 41. Here, for example, when the high-friction member is located at both the first corner C1 and the second corner C2, the remaining portion of the annular portion 41 is the remaining portion of the annular portion 41 excluding both the first corner C1 and the second corner C2. For example, when the high-friction member is located at the first corner C1, the remaining portion of the annular portion 41 is the remaining portion of the annular portion 41 excluding the first corner C1 of the annular portion 41. For example, when a high-friction member is located at the second corner C2, the remaining portion of the annular portion 41 is the other portion of the annular portion 41 excluding the second corner C2. As the high-friction member, for example, a member with a high friction coefficient such as rubber may be used instead of the uneven portion. The high-friction member may be disposed at least at one of the first corner C1 and the second corner C2 by, for example, adhesion or bonding.

[0057] Here, for example, if an uneven portion or a high friction member is arranged on the tapered inclined portion, when the water level changes gently, the uneven portion or the high friction member is unlikely to come into contact with the outer circumferential portion 3os of the columnar portion 3. For this reason, for example, the slider portion 4 is likely to move up and down along the longitudinal direction of the columnar portion 3 in response to the change in the water level. Here, for example, the angle of the tapered inclined portion is set so that when the annular portion 41 is inclined with respect to the columnar portion 3 and the first corner portion C1 and the second corner portion C2 of the annular portion 41 come into contact with the outer circumferential portion 3os of the columnar portion 3, the inclined portions at the upper edge portion 41ue and the lower edge portion 41be are positioned along the outer circumferential portion 3os of the columnar portion 3.

[0058] <2-3. Fourth embodiment> In each of the above embodiments, for example, as shown in Figure 13, the slider portion 4 has a protrusion 43 that is fixed to a first lower portion 411 of the annular portion 41 on the island-shaped portion 1 side and extends downward beyond the annular portion 41, and this protrusion 43 may include an attachment portion 42.

[0059] If this configuration is adopted, for example, the mooring line 5 is attached to the protruding portion 43 extending below the annular portion 41, so that the inclination angle of the mooring line 5 connecting the island-shaped portion 1 and the slider portion 4 with respect to the water surface 700s can be increased. For this reason, for example, as shown in FIG. 14, when the mooring line 5 suddenly pulls the first lower portion 411 of the annular portion 41 on the island-shaped portion 1 side through the protruding portion 43, the angle formed by the direction in which the mooring line 5 pulls the annular portion 41 obliquely upward and the horizontal plane can be increased. As a result, for example, when the mooring line 5 suddenly pulls the first lower portion 411 of the annular portion 41 on the island-shaped portion 1 side through the protruding portion 43, the annular portion 41 is more likely to be inclined with respect to the columnar portion 3, and the first corner portion C1 and the second corner portion C2 of the annular portion 41 are more likely to be caught by friction with the outer circumferential portion 3os of the columnar portion 3. For this reason, for example, resistance to sudden vertical movement of the annular portion 41 along the longitudinal direction of the columnar portion 3 may become large. As a result, for example, the state in which the mooring line 5 pulls the float 11 is likely to be maintained, and the float 11 is unlikely to swing. Therefore, for example, problems such as collision between the floats 11, application of a large local load to the portion connecting the floats 11 and the portion of the float 11 to which the mooring line 5 is attached, and capsizing of the float 11 are unlikely to occur. Therefore, for example, the floating solar power generation system 100 is unlikely to be damaged.

[0060] Here, the protruding portion 43 is, for example, a portion of the annular portion 41 protruding from the first lower portion 411 on the island portion 1 side. The protruding portion 43 may be, for example, integrally formed of the same material as the annular portion 41, or may be a member such as a metal fitting fixed to the annular portion 41 by fitting, engaging, or joining. In the example of FIG. 13, the protruding portion 43 is positioned so as to extend from the first lower portion 411 on the island portion 1 side of the annular portion 41 along the gravity direction along the direction in which the through hole 41th penetrates the annular portion 41. The protruding portion 43 may have any of a rod-like, tubular, and plate-like shape. Also, for example, a form in which the attached portion 42 is located at the lower end of the protruding portion 43 may be adopted. In this case, the attached portion 42 is indirectly fixed to the first lower portion 411 via a portion of the protruding portion 43 other than the attached portion 42.

[0061] <2-4. Fifth embodiment> In each of the above embodiments, for example, as shown in Figures 15 to 17, the floating solar power generation system 100 may have a floating body portion 44 floating on the water surface 700s, and the annular portion 41 may be positioned underwater in a state suspended from the floating body portion 44.

[0062] If this configuration is adopted, for example, since the ring-shaped portion 41 is located underwater, the inclination angle of the mooring line 5 connecting the island-shaped portion 1 and the slider portion 4 with respect to the water surface 700s becomes large. Therefore, for example, as shown in FIG. 18, when the mooring line 5 suddenly pulls the first lower portion 411 of the ring-shaped portion 41 on the island-shaped portion 1 side through the attached portion 42 or the like, the angle formed by the direction in which the mooring line 5 pulls the ring-shaped portion 41 diagonally upward and the horizontal plane can become larger. As a result, for example, when the mooring line 5 suddenly pulls the first lower portion 411 of the ring-shaped portion 41 on the island-shaped portion 1 side through the attached portion 42 or the like, the ring-shaped portion 41 is more likely to be inclined with respect to the columnar portion 3, and the first corner portion C1 and the second corner portion C2 of the ring-shaped portion 41 are more likely to be caught by the outer periphery portion 3os of the columnar portion 3 due to friction. Therefore, for example, the resistance to the sudden vertical movement of the ring-shaped portion 41 along the longitudinal direction of the columnar portion 3 can be increased. As a result, for example, the state in which the mooring line 5 pulls the float 11 is likely to be maintained, and the float 11 is unlikely to swing. Therefore, for example, problems such as collisions between the floats 11, application of a large local load to the portion connecting the floats 11 and the portion of the float 11 to which the mooring line 5 is attached, and capsizing of the float 11 are unlikely to occur. Therefore, for example, the floating solar power generation system 100 is unlikely to be damaged.

[0063] Here, the floating body portion 44 may have a structure that floats on the water surface 700s. For example, a hollow float made of resin or a float made of polystyrene foam is applied to the floating body portion 44. In the example of Fig. 15 to Fig. 18, a plurality of floating body portions 44 are arranged for one slider portion 4. In this case, for example, it is easy to suspend the ring-shaped portion 41 at a plurality of positions of the ring-shaped portion 41 by the plurality of floating body portions 44 so that the penetration direction of the through-hole 41th is not inclined with respect to the longitudinal direction of the columnar portion 3. For example, a ring-shaped floating body portion 44 having a structure surrounding the columnar portion 3 may be arranged for one slider portion 4. The ring-shaped portion 41 is suspended, for example, by a string-like, rope-like or chain-like member such as a wire W1 from the floating body portion 44 floating on the water surface 700s. The ring-shaped portion 41 has a structure that can sink in water, for example, by applying a material such as a metal having a specific gravity greater than that of water to at least a part of the material. The annular portion 41 may have a structure without a hollow portion, or may have a structure with a main body portion forming an outer surface with a hollow portion. This hollow portion may be filled with a liquid having a specific gravity substantially the same as that of water, such as water, or a solid such as resin. As a result, the annular portion 41 may float in water while being suspended from the floating portion 44.

[0064] <2-5. Sixth embodiment> In each of the above embodiments, for example, as shown in FIG. 19 and FIG. 20, the columnar part 3 may have a portion (also called an inclined portion) 31 in which the longitudinal direction of the columnar part 3 is inclined with respect to the vertical direction in a direction away from the island part 1 as it goes upward. Here, for example, a mode in which the entire columnar part 3 is inclined with respect to the vertical direction from the bottom 700b toward the top is considered. In this case, the longitudinal direction of the columnar part 3 is inclined with respect to the vertical direction in a direction away from the island part 1 as it goes upward from the bottom 700b to the top end. Here, for example, the angle at which the longitudinal direction of the columnar part 3 is inclined with respect to the vertical direction is applied to be about 1 degree to 5 degrees. Also, here, for example, the columnar part 3 may have an inclined portion 31 in at least a part on the upper end side in the longitudinal direction. The part on the upper end side includes, for example, a part of the columnar part 3 located above the water surface 700s. In this case, for example, the lower end portion of the columnar portion 3 and the portion between the lower end portion and the upper end portion (also called the middle portion) may have a longitudinal direction positioned along the vertical direction, or may have a longitudinal direction inclined with respect to the vertical direction.

[0065] Here, for example, assume a situation in which the water surface 700s has reached the maximum water level in design, as shown in Fig. 20. In this situation, for example, in a state in which the ring-shaped portion 41 is pulled by the mooring rope 5 connecting the ring-shaped portion 41 and the island-shaped portion 1, the portion of the inner periphery 41is of the ring-shaped portion 41 opposite to the island-shaped portion 1 abuts against the outer periphery 3os of the columnar portion 3, and the length of the mooring rope 5 is set so that the ring-shaped portion 41 cannot move upward along the longitudinal direction of the columnar portion 3.

[0066] By adopting the above-mentioned configuration, even if the solar cell module 2 is blown up by a gust of wind or waves occur, the annular portion 41 of the slider portion 4 is unlikely to come off from the upper portion of the columnar portion 3. As a result, for example, the floating solar power generation system 100 is unlikely to be damaged.

[0067] Here, for example, instead of having the inclined portion 31, the columnar portion 3 may have a stopper portion 32 located above the annular portion 41 as shown in Figs. 21 and 22. The stopper portion 32 protrudes, for example, in a direction intersecting the longitudinal direction of the columnar portion 3. In the example of Figs. 21 and 22, the stopper portion 32 protrudes horizontally from the upper portion of a rod-shaped or tubular elongated portion (also called a long portion) of the columnar portion 3 extending upward from the bottom 700b of the water. The stopper portion 32 may have a configuration in which it is located in a ring shape along the outer periphery 3os of the long portion of the columnar portion 3, or may have a configuration in which it protrudes in one or more directions from the outer periphery 3os of the long portion of the columnar portion 3. Fig. 22 shows a state in which the water surface 700s has reached the highest water level in design. 22, the stopper portion 32 is disposed in the columnar portion 3 so that even if the position of the annular portion 41 rises in response to the rise of the water surface 700s, the stopper portion 32 is positioned above the annular portion 41. Here, for example, the size of the stopper portion 32 is set to a size such that when the annular portion 41 is moved upward along the longitudinal direction of the columnar portion 3, the presence of the stopper portion 32 prevents the annular portion 41 from moving above the stopper portion 32.

[0068] Even if the above-mentioned configuration is adopted, for example, even if the solar cell module 2 is blown up by a gust of wind or waves occur, the annular portion 41 of the slider portion 4 is unlikely to come off from the upper portion of the columnar portion 3. As a result, for example, the floating solar power generation system 100 is unlikely to be damaged.

[0069] Here, for example, the columnar portion 3 may have both the inclined portion 31 and the stopper portion 32.

[0070] <2-6. Seventh embodiment> In each of the above-mentioned embodiments, for example, as shown in Fig. 23 and Fig. 24, a reinforcing rope (also called a first reinforcing rope) 7a may be installed between the fixing part 6 fixed to the land 800 and a part of the columnar part 3 located above the water surface 700s. In this case, the floating solar power generation system 100 includes, for example, the fixing part 6 and the first reinforcing rope 7a. Here, the fixing part 6 is fixed to, for example, a part of the land 800 located on the opposite side of the island part 1 across the columnar part 3. If this configuration is adopted, even if a large force is applied to the columnar part 3 from the island part 1 through the mooring rope 5 and the slider part 4 due to, for example, the blowing up of the solar cell module 2 due to a strong wind or the like and waves, the presence of the first reinforcing rope 7a makes it difficult for the columnar part 3 to break or bend.

[0071] Here, for example, a stake-shaped anchor member buried in the ground on land is applied to the fixing part 6. For example, a protruding ring-shaped mounting part or a through hole is applied to the part of the columnar part 3 to which the first reinforcing rope 7a is attached (also referred to as the first mounting part). The first mounting part is located, for example, in a part of the columnar part 3 above the water surface 700s. For example, a rope having various forms such as a string-like, rope-like or chain-like rope is applied to the first reinforcing rope 7a. For example, a member having a structure similar to that of the mooring rope 5 may be applied to the first reinforcing rope 7a, or a wire thinner than the mooring rope 5 may be applied. For example, the first reinforcing rope 7a is installed between the fixing part 6 and the columnar part 3 so that slack is minimized. The first reinforcing rope 7a is attached to the first mounting part of the columnar part 3 and to the fixing part 6 using a member such as a shackle.

[0072] Also, for example, as shown in FIG. 23, a second reinforcing rope 7b may be installed between the fixing part 6 fixed to the land 800 and the reinforcing columnar part 8, and a third reinforcing rope 7c may be installed between the reinforcing columnar part 8 and a part of the columnar part 3 located above the water surface 700s. In this case, the floating solar power generation system 100 includes, for example, the fixing part 6, the reinforcing columnar part 8, the second reinforcing rope 7b, and the third reinforcing rope 7c. Here, the fixing part 6 is fixed, for example, to a location located on the opposite side of the island part 1 across the columnar part 3 and the reinforcing columnar part 8 of the land 800. The reinforcing columnar part 8 is fixed, for example, to the bottom of the water 700b and extends above the water surface 700s. The reinforcing columnar part 8 is located, for example, on the opposite side of the island part 1 across the columnar part 3. Each of the second reinforcing rope 7b and the third reinforcing rope 7c is, for example, a reinforcing rope. If this configuration is adopted, for example, a reinforcing rope can be installed from the columnar part 3 to the fixed part 6 via the reinforcing columnar part 8. As a result, even if the location where the fixed part 6 can be arranged is limited due to the shape of the land 800 surrounding the water surface 700s, the columnar part 3 can be reinforced by installing a reinforcing rope from a desired direction to the columnar part 3. As a result, even if a large force is applied to the columnar part 3 from the island part 1 via the mooring rope 5 and the slider part 4 due to, for example, the solar cell module 2 being blown up by a strong wind or the like and waves, the columnar part 3 is unlikely to break or bend.

[0073] Here, for example, the fixing portion 6, the reinforcing columnar portion 8, and the columnar portion 3 may be aligned in a straight line, or may not be aligned in a straight line. The reinforcing columnar portion 8 is, for example, a reinforcing columnar portion (also called a dummy columnar portion) different from the columnar portion 3. For example, a member having a structure similar to that of the columnar portion 3 may be applied to the reinforcing columnar portion 8. For example, a fixing method similar to that of the columnar portion 3 to the bottom of the water 700b is applied to the fixing method of the reinforcing columnar portion 8 to which the second reinforcing rope 7b is attached (also called the second attachment portion). For example, a protruding annular attachment portion or a through hole is applied to the part of the reinforcing columnar portion 8 to which the second reinforcing rope 7b is attached. For example, the second attachment portion of the reinforcing columnar portion 8 to which the second reinforcing rope 7b is attached may be located above the water surface 700s of the reinforcing columnar portion 8, or may be located below the water surface 700s. A protruding annular attachment portion or a through hole is applied to the portion (also called the third attachment portion) of the reinforcing columnar portion 8 to which the third reinforcing cord 7c is attached, for example. The third attachment portion to which the third reinforcing cord 7c is attached of the reinforcing columnar portion 8 may be located above the water surface 700s of the reinforcing columnar portion 8, for example, or may be located below the water surface 700s. The second attachment portion and the third attachment portion may be a common portion. A protruding annular attachment portion or a through hole is applied to the portion (also called the fourth attachment portion) of the columnar portion 3 to which the third reinforcing cord 7c is attached, for example. The fourth attachment portion to which the third reinforcing cord 7c is attached of the columnar portion 3 is located above the water surface 700s of the columnar portion 3. For each of the second reinforcing cord 7b and the third reinforcing cord 7c, for example, a cord having various forms such as a string-like, rope-like, or chain-like form is applied. For each of the second reinforcing cord 7b and the third reinforcing cord 7c, for example, a member having a structure similar to that of the mooring cord 5 may be used, or a wire thinner than the mooring cord 5 may be used. The second reinforcing cord 7b is installed, for example, between the fixing portion 6 and the reinforcing columnar portion 8 so as to prevent slack as much as possible. The third reinforcing cord 7c is installed, for example, between the reinforcing columnar portion 8 and the columnar portion 3 so as to prevent slack as much as possible.The attachment of the second reinforcing cord 7b to the fixed portion 6, the attachment of the second reinforcing cord 7b to the second mounting portion of the reinforcing columnar portion 8, the attachment of the third reinforcing cord 7c to the third mounting portion of the reinforcing columnar portion 8, and the attachment of the third reinforcing cord 7c to the fourth mounting portion of the columnar portion 3 are each realized using a member such as a shackle.

[0074] Also, for example, as shown in FIG. 23 and FIG. 24, the fourth reinforcing rope 7d may be installed between any two of the plurality of columnar parts 3. In this case, the floating solar power generation system 100 includes, for example, a plurality of columnar parts 3 and a fourth reinforcing rope 7d. Here, the plurality of columnar parts 3 are positioned, for example, so as to surround the island-shaped part 1. The plurality of columnar parts 3 include, for example, a first columnar part 3 and a second columnar part 3. The fourth reinforcing rope 7d is a reinforcing rope installed, for example, between a part of the first columnar part 3 located above the water surface 700s and a part of the second columnar part 3 located above the water surface 700s. If this configuration is adopted, for example, the first columnar part 3 and the second columnar part 3 can be mutually reinforced. As a result, even if a large force is applied to the columnar portion 3 from the island portion 1 via the mooring rope 5 and the slider portion 4 due to, for example, the solar cell module 2 being blown up by a strong wind or waves, the columnar portion 3 is unlikely to be damaged, such as broken or bent.

[0075] Here, for example, the first columnar portion 3 and the second columnar portion 3 as the two columnar portions 3 on which the fourth reinforcing rope 7d is installed may be located with the island portion 1 between them, or may be located without the island portion 1 between them. A protruding annular mounting portion or a through hole is applied to the portion of the first columnar portion 3 to which the fourth reinforcing rope 7d is attached (also referred to as the fifth mounting portion). A protruding annular mounting portion or a through hole is applied to the portion of the second columnar portion 3 to which the fourth reinforcing rope 7d is attached (also referred to as the sixth mounting portion). The fifth mounting portion of the first columnar portion 3 to which the fourth reinforcing rope 7d is attached is, for example, located above the water surface 700s of the first columnar portion 3. The sixth mounting portion of the second columnar portion 3 to which the fourth reinforcing rope 7d is attached is, for example, located above the water surface 700s of the second columnar portion 3. The fourth reinforcing cord 7d may be, for example, a cord having various shapes such as a string, a rope, or a chain. For example, a member having a structure similar to that of the mooring cord 5 may be used for the fourth reinforcing cord 7d, or a wire thinner than the mooring cord 5 may be used. The fourth reinforcing cord 7d is installed, for example, between the first columnar portion 3 and the second columnar portion 3 so as to minimize slack. The attachment of the fourth reinforcing cord 7d to the fifth attachment portion of the first columnar portion 3 and the attachment of the fourth reinforcing cord 7d to the sixth attachment portion of the second columnar portion 3 are each realized by using a member such as a shackle.

[0076] <3.Other> In each of the above first to fourth, sixth and seventh embodiments, for example, a float that floats on water may be directly attached to the annular portion 41, so that the annular portion 41 floats on the water surface 700s.

[0077] In each of the above embodiments, for example, a minute current may be passed through each of the mooring rope 5, the first reinforcing rope 7a, the second reinforcing rope 7b, the third reinforcing rope 7c, and the fourth reinforcing rope 7d, and the current flow state may be detected by a sensor such as an ammeter or a voltmeter. This allows, for example, abnormalities such as the presence or absence of a break (also called a disconnection) in the rope to be detected. Here, the rope may include, for example, an insulating cable for passing a minute current. Here, if information indicating the detection result by the sensor is transmitted to a remote location using wired communication or wireless communication, the user can timely monitor and grasp abnormalities such as the presence or absence of a break (disconnection) in the rope at a remote location. Here, for example, a part of the direct current generated in the solar cell module 2 can be used as the minute current passed through the rope.

[0078] In each of the above embodiments, for example, the first end of the mooring line 5 attached to the float 11 and the second end of the mooring line 5 attached to the attachment portion 42 may be located at substantially the same height. In other words, the mooring line 5 may be disposed so as to extend substantially horizontally from the first end to the second end.

[0079] In each of the above embodiments, for example, when the annular portion 41 is viewed from above in a plane, the annular portion 41 is not limited to a portion having a shape surrounding the columnar portion 3 in all directions of 360 degrees. For example, when the annular portion 41 is viewed from above in a plane, the annular portion 41 may be a portion having a shape in which a portion of all directions of 360 degrees surrounding the columnar portion 3 is missing, within a range in which the annular portion 41 does not deviate from the columnar portion 3 in the horizontal direction. Specifically, for example, when the annular portion 41 is viewed from above in a plane, the annular portion 41 may be a portion having a shape in which a portion of all directions of 360 degrees surrounding the columnar portion 3 is missing in a range of 1 degree to 90 degrees. From another perspective, when the annular portion 41 is viewed from above in a plane, the missing portion of all directions of 360 degrees surrounding the columnar portion 3 in the annular portion 41 may be a portion that forms a gap smaller than the outer diameter D1 of the columnar portion 3. In other words, for example, when the annular portion 41 is viewed in plan from above, the annular portion 41 may have a C-shape. Even in this case, for example, the annular portion 41 has an internal space 41h as a space located inside where the columnar portion 3 is inserted.

[0080] In each of the above embodiments, for example, the surface of the outer circumferential portion 3os of the columnar portion 3 may have some unevenness. As a result, for example, when the annular portion 41 is inclined with respect to the columnar portion 3 and the first corner portion C1 and the second corner portion C2 on the inner circumferential side of the annular portion 41 are pressed against the outer circumferential portion 3os of the columnar portion 3, the first corner portion C1 and the second corner portion C2 of the annular portion 41 are easily caught by friction against the outer circumferential portion 3os of the columnar portion 3. As a result, for example, resistance to abrupt vertical movement of the annular portion 41 along the longitudinal direction of the columnar portion 3 may increase. Here, for example, by adding some ingenuity to the painting for forming the surface of the outer circumferential portion 3os of the columnar portion 3, the surface of the outer circumferential portion 3os can be made to have some unevenness.

[0081] In each of the above-described embodiments, for example, the island-shaped portion 1 may be composed of one or more floats 11 in any number.

[0082] In each of the above embodiments, for example, one or more solar cell modules 2 may be fixed on the island portion 1.

[0083] It goes without saying that all or part of the components constituting each of the above-described embodiments and various modified examples can be appropriately combined to the extent that no contradiction occurs. [Explanation of symbols]

[0084] 1,901 islands 10. Solar Float 100,900 Floating solar power generation system 11,911 float 2,902 Solar modules 3 Columnar part 31 Slope section 32 Stopper part 3os outer periphery 4 Slider section 41 Circular section 411 1st Lower Section 41be lower edge 41h interior space 41is inner circumference 41sp Gap 41th through hole 41ue upper edge 42 Mounting part 43 Protrusion 44 Floating body section 5,905 Mooring lines 6 Fixed part 700b underwater 700s water surface 7a 1st reinforcing rope 7b Second reinforcing rope 7c 3rd reinforcing rope 7d Fourth reinforcing rope 8 Reinforcing column 800 land C1 1st corner C2 2nd corner D1 Outer diameter D2 Inner diameter

Claims

1. An island-shaped portion having a float floating on the water surface; a solar cell module fixed on the island; A pillar-shaped portion fixed to the bottom of the water and extending above the water surface; a slider portion located in a state where it can move along the longitudinal direction of the columnar portion; a mooring line connecting the slider portion and the island portion, the slider portion includes an annular portion having an internal space through which the columnar portion is inserted, and an attachment portion that is fixed to a first lower portion of the annular portion that is located in the water on the island-shaped portion side and to which the mooring rope is attached, the slider portion includes a protrusion portion fixed to the first lower portion of the annular portion and positioned so as to extend below the annular portion; A floating solar power generation system, wherein the protrusion includes the mounting portion.

2. An island-shaped portion having a float floating on the water surface; a solar cell module fixed on the island; A pillar-shaped portion fixed to the bottom of the water and extending above the water surface; a slider portion located in a state where it can move along the longitudinal direction of the columnar portion; a mooring line connecting the slider portion and the island portion, the slider portion includes an annular portion having an internal space through which the columnar portion is inserted, and an attachment portion that is fixed to a first lower portion of the annular portion that is located in the water on the island-shaped portion side and to which the mooring rope is attached, A floating solar power generation system, wherein the columnar portion includes at least one of an inclined portion in which the longitudinal direction is inclined with respect to the up-down direction in a direction away from the island-shaped portion as it extends upward, and a stopper portion located above the annular portion and protruding in a direction intersecting the longitudinal direction.

3. An island-shaped portion having a float floating on the water surface; a solar cell module fixed on the island; A pillar-shaped portion fixed to the bottom of the water and extending above the water surface; a slider portion located in a state where it can move along the longitudinal direction of the columnar portion; a mooring line connecting the slider portion and the island portion; A fixed part fixed to land; A reinforcing column fixed to the bottom of the water and extending above the water surface; A second reinforcing rope is installed between the reinforcing column portion and the fixing portion; and a third reinforcing rope installed between a portion of the columnar portion located above the water surface and the reinforcing columnar portion, the slider portion includes an annular portion having an internal space through which the columnar portion is inserted, and an attachment portion that is fixed to a first lower portion of the annular portion that is located in the water on the island-shaped portion side and to which the mooring rope is attached, the fixing portion is fixed to a portion of the land that is located on the opposite side to the island portion across the column portion and the reinforcing column portion, A floating solar power generation system, wherein the reinforcing column is located on the opposite side of the column from the island.

4. An island-shaped portion having a float floating on the water surface; a solar cell module fixed on the island; A pillar-shaped portion fixed to the bottom of the water and extending above the water surface; a slider portion located in a state where it can move along the longitudinal direction of the columnar portion; a mooring line connecting the slider portion and the island portion, a slider portion including an annular portion having an internal space through which the columnar portion is inserted, and a mounting portion fixed to a first lower portion of the annular portion located underwater on the island portion side and to which the mooring line is attached, A plurality of the columnar portions are positioned so as to surround the island portion; and a fourth reinforcing cord; the plurality of columns includes a first column and a second column, A floating solar power generation system, wherein the fourth reinforcing rope is installed between a portion of the first pillar portion that is located above the water surface and a portion of the second pillar portion that is located above the water surface.

5. An island-shaped portion having a float floating on the water surface; a solar cell module fixed on the island; A pillar-shaped portion fixed to the bottom of the water and extending above the water surface; a slider portion located in a state where it can move along the longitudinal direction of the columnar portion; a mooring line connecting the slider portion and the island portion; A fixing portion is fixed to a portion of the land that is located on the opposite side of the island portion with the pillar portion in between; a first reinforcing rope disposed between a portion of the columnar portion located above the water surface and the fixed portion, The slider portion includes an annular portion having an internal space through which the columnar portion is inserted, and an attachment portion fixed to a first lower portion of the annular portion located underwater on the island-shaped portion side and to which the mooring line is attached, in a floating solar power generation system.

6. An island-shaped portion having a float floating on the water surface; a solar cell module fixed on the island; A pillar-shaped portion fixed to the bottom of the water and extending above the water surface; a slider portion located in a state where it can move along the longitudinal direction of the columnar portion; a mooring line connecting the slider portion and the island portion, the slider portion includes an annular portion having an internal space through which the columnar portion is inserted, and an attachment portion that is fixed to a first lower portion of the annular portion that is located in the water on the island-shaped portion side and to which the mooring rope is attached, The first lower part is the part of the lower region located at the bottom of the annular portion when the annular portion is divided into M equal parts in the vertical direction (M is a natural number greater than or equal to 3) that is on the island-shaped portion side, the lower region being located at the bottom of the annular portion.

7. The floating solar power generation system according to claim 6, A floating solar power generation system, wherein a portion of the annular portion is located above the water surface.

8. A floating solar power generation system according to any one of claims 1 to 6, Further comprising a floating body portion floating on the water surface, A floating solar power generation system, wherein the annular portion is positioned underwater while being suspended from the floating portion.

9. A floating solar power generation system according to any one of claims 1 to 8, A floating solar power generation system, wherein the annular portion has, at least one of the upper corners of the inner periphery on the island-shaped portion side and the lower corners on the opposite side from the island-shaped portion, a convex pointed portion whose cross-sectional shape along the longitudinal direction forms an acute angle, an uneven portion, or a high-friction member whose surface generates a greater frictional force than the remaining parts of the annular portion.

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