Covering structure of water storage facility

Abstract

To provide a cover structure 10 for a water storage facility 1 that can cover a water surface and use the water surface effectively.SOLUTION: A cover structure 10 for covering the water surface of a water storage facility 1 has a float assembly 11 installed on the water surface and equipped with a plurality of main floats 16, a sheet 13 provided around the outer periphery of the float assembly 11 to cover the water surface, and a plurality of solar panels 12 supported on the main floats 16. This allows the water surface to be covered by the float assembly 11 and sheet 13. Furthermore, the water surface can be used effectively since the cover structure 10 is equipped with the plurality of solar panels 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a covering structure for covering the water surface of a water storage facility for agricultural water, industrial water, or the like. [Background technology]

[0002] In water storage facilities, the water surface is sometimes covered with a canopy to prevent evaporation of service water and to prevent water pollution due to the growth of blue-green algae and the like. One such canopy known is a sheet-like float, which combines a sheet-like synthetic resin float placed on the water surface with a synthetic resin sheet attached to the top surface of the float (Patent Document 1). A curtain-like sheet is fixed around the entire periphery of the sheet-like float, and the outer edge of the curtain-like sheet is fixed to the upper end of the side wall of the water storage facility. The curtain-like sheet moves freely in response to fluctuations in the water level.

[0003] Furthermore, a canopy that does not require the interior surface of a water storage facility to be covered with a curtain-shaped sheet is known (Patent Document 2), in which a hanging body that hangs down into the water is attached to at least one side of the periphery of a flat buoyant body, and weights are attached to this hanging body to form a canopy block that is continuous above the water surface. This canopy is anchored by mooring equipment attached to the periphery of the water storage facility. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-19087 [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-77669 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional technology, the canopy only serves the function of covering the water storage facility. Therefore, although it can prevent evaporation of the water and water pollution, it cannot be said that the water surface is being used effectively, and there is room for improvement in the effective use of the water surface.

[0006] In view of the above background, an object of the present invention is to provide a covering structure for a water storage facility that can cover the water surface and make effective use of the water surface. [Means for solving the problem]

[0007] In order to solve the above problem, one aspect of the present invention is a covering structure (10) for covering the water surface of a water storage facility (1), comprising a float assembly (11) placed on the water surface and having a plurality of main floats (16), a sheet (13) placed on the outer periphery of the float assembly to cover the water surface, and a plurality of solar panels (12) supported by the main floats.

[0008] According to this aspect, the water surface can be covered with the float assembly and the sheet. Also, since the covering structure includes a plurality of solar panels, the water surface can be used effectively.

[0009] In the above aspect, the water storage facility (1) has a substantially horizontal bottom surface (4) and a slope (5) extending obliquely from the outer edge of the bottom surface, and the bottom surface and the slope are covered with a non-permeable waterproof sheet (6). artificial The reservoir may be a water reservoir, and the main float (16) may be disposed in a region of the water surface that corresponds to the bottom surface in a plan view.

[0010] When the water level drops, the covering structure artificial The covering structure may come into contact with the bottom of the reservoir, including the bottom and slopes. According to this aspect, when the covering structure comes into contact with the bottom of the water storage facility, the heavy main float supporting the solar panels comes into contact with the waterproof sheet at the bottom, thereby suppressing damage to the waterproof sheet.

[0011] In the above aspect, the float assembly (11) may further include a plurality of cover-only floats (18) that are provided on the outer periphery of the main float (16) and do not support the solar panels (12).

[0012] According to this aspect, even if the distance from the main float to the outer periphery of the water surface is large, the width of the sheet can be prevented from becoming excessively large, thereby suppressing the sheet from being blown around by the wind.

[0013] In the above aspect, the coating-only float (18) may be disposed in a region of the water surface that corresponds to the bottom surface (4) in a plan view.

[0014] According to this aspect, when the water level drops and the covering structure comes into contact with the bottom of the water storage facility, the covering float comes into contact with the waterproof sheet on the slope, preventing the waterproof sheet from being damaged.

[0015] In the above aspect, the cover-only float (18) is preferably formed from a material softer than the main float (16) and is further preferably positioned in an area of ​​the water surface corresponding to the inclined surface (5) in a plan view.

[0016] According to this aspect, the covering float may come into contact with the waterproof sheet on the slope when the water level drops, but because it is made of a material softer than the float, damage to the waterproof sheet can be suppressed.

[0017] In the above aspect, the sheet (13) may have an inner edge (13a) arranged in a ring shape around the float assembly (11) and connected to the float assembly via an inner connecting rope (20), and an outer edge (13b) attached to a portion (7) of the water storage facility (1) that is located outside the water surface when the facility is full.

[0018] According to this aspect, it is possible to prevent the occurrence of portions of the water surface that are not covered by the sheet when the water level changes.

[0019] In the above aspect, it is preferable that the inner edge (13a) of the sheet (13) is arranged below the float assembly (11) so as to overlap the float assembly.

[0020] According to this aspect, when the water level drops, the inner edge of the sheet slides under the float assembly. As the water level drops, the overlap between the sheet and the float assembly decreases, but the sheet remains covering the water surface. This effectively prevents water from evaporating from the water storage facility.

[0021] In the above aspect, it is preferable that the inner edge (13a) of the sheet (13) is arranged above the float assembly (11) so as to overlap the float assembly.

[0022] According to this aspect, when the water level drops, the inner edge of the sheet slides over the float assembly. As the water level drops, the overlap between the sheet and the float assembly decreases, but the sheet remains covered over the water surface. This effectively prevents water from evaporating from the water storage facility.

[0023] In the above aspect, the sheet (13) may be arranged in a ring shape around the float assembly (11) and have an inner edge (13a) attached to the float assembly, and an outer edge (13b) connected via an outer connecting rope (30) to a portion (7) of the water storage facility (1) that is located outside the water surface when full.

[0024] According to this aspect, after the water level rises, the sheet can be deployed to cover the water surface by pulling the outer connecting ropes. This operation is easy because there is no need to overlap the float assembly.

[0025] In the above aspect, the outer connecting rope (30) may be an expandable rope made of an elastic material.

[0026] According to this aspect, after the water level rises, the sheet can be deployed to cover the water surface without pulling the rope, which makes maintenance of the covering structure easy. [Effects of the Invention]

[0027] According to the above aspect, it is possible to provide a covering structure for a water storage facility that can cover the water surface and make effective use of the water surface. [Brief explanation of the drawings]

[0028] [Figure 1] Plan view of the covering structure of the water storage facility according to the first embodiment when it is full of water [Figure 2] Side view of the left half of the covering structure shown in Figure 1 [Figure 3] Illustrative diagram of the operation of the covering structure when the water level drops [Figure 4] Plan view of the covering structure when the water level drops [Figure 5] Illustration of the operation of the covering structure when the water level rises [Figure 6] A side view of the left half of the covering structure of the water storage facility according to the second embodiment [Figure 7] Illustrative diagram of the operation of the covering structure when the water level drops [Figure 8] Illustration of the operation of the covering structure when the water level rises [Figure 9] A side view of the left half of the covering structure of the water storage facility according to the third embodiment [Figure 10] Illustrative diagram of the operation of the covering structure when the water level drops [Figure 11] Illustration of the operation of the covering structure when the water level rises [Figure 12] Plan view of the covering structure of the water storage facility according to the fourth embodiment [Figure 13] Illustrative diagram of the operation of the covering structure when the water level drops [Figure 14] Illustration of the operation of the covering structure when the water level rises [Figure 15] Plan view of the covering structure of the water storage facility according to the fifth embodiment [Figure 16] Illustrative diagram of the operation of the covering structure when the water level drops [Figure 17] Illustration of the operation of the covering structure when the water level rises DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, several embodiments of the present invention will be described in detail with reference to the drawings.

[0030] First Embodiment First, a first embodiment of the present invention will be described with reference to Figs. 1 to 5. Fig. 1 is a plan view of a covering structure 10 when a water storage facility 1 according to the first embodiment is full of water. As shown in Fig. 1, the water storage facility 1 artificial In other embodiments, the water storage facility 1 may be a naturally occurring pond, lake, artificial The water storage facility 1 may be used to store water for drinking water, industrial water, agricultural water, or the like.

[0031] The covering structure 10 is provided to cover the water surface to prevent evaporation of water 2 stored in the water storage facility 1. The covering structure 10 has a float assembly 11, a plurality of solar panels 12 provided on the float assembly 11, and a sheet 13 provided on the outer periphery of the float assembly 11. The float assembly 11 is provided approximately in the center of the water surface of the water storage facility 1, and the sheet 13 is provided around the entire periphery of the float assembly 11. The float assembly 11 is moored to the bottom or outer periphery of the water storage facility 1 by mooring equipment (not shown).

[0032] The float assembly 11 comprises a plurality of main floats 16 that support solar panels 12, a plurality of connecting floats 17 for connecting adjacent main floats 16, and a plurality of covering floats 18 that are provided on the outer periphery of the plurality of main floats 16. The main floats 16 are arranged in multiple rows both vertically and horizontally. Each main float 16 supports one solar panel 12. The connecting floats 17 are arranged to fill the gaps between adjacent main floats 16. In other embodiments, the main floats 16 may be connected to each other, and the connecting floats 17 may not be provided.

[0033] The main float 16 and the connecting float 17 are hollow structures made of hard resin. The insides of the main float 16 and the connecting float 17 may be hollow, or may be provided with a floating body such as expanded polystyrene with a specific gravity of less than 1. Alternatively, to improve stability, an appropriate amount of water 2 or a weight may be provided inside the main float 16 and the connecting float 17.

[0034] The coating-only float 18 is a float that does not support the solar panel 12. The coating-only float 18 may be made of the same material as the main float 16, or may be made of a different material from the main float 16. In this embodiment, the coating-only float 18 is a hollow structure made of the same hard resin as the main float 16. The coating-only floats 18 are arranged around the entire periphery of the main float 16 (i.e., on the outer periphery of the float assembly 11). In the illustrated example, the coating-only floats 18 are arranged in two or three rows around the entire periphery of the main float 16. The coating-only floats 18 are connected to adjacent main floats 16, connecting floats 17, or coating-only floats 18 via connecting means 19 (see Figure 2), such as ropes.

[0035] The mooring equipment is equipment for connecting the float assembly 11 to the ground to keep it in a predetermined horizontal position, and is composed of, for example, a plurality of mooring ropes each having one end connected to an anchor member and the other end connected to the float assembly 11. The mooring ropes may extend outward from the outer periphery of the float assembly 11, or may extend downward from the bottom of the float assembly 11.

[0036] The sheet 13 is made of a non-permeable sheet and is placed on the water surface so as to cover the area of ​​the water surface that is not covered by the float assembly 11. The sheet 13 has a specific gravity less than 1 and floats on the water surface. The sheet 13 may be a single sheet or may be divided into multiple pieces. In this embodiment, four sheets 13 are placed along the four sides of the water storage facility 1 so as to cover the entire area of ​​the water surface around the periphery of the float assembly 11, excluding the corners. In other embodiments, multiple sheets 13 may be placed in a rectangular ring shape around the entire periphery of the float assembly 11.

[0037] Here, "annularly" does not mean that it is continuously connected in the circumferential direction, but that it extends over most of the circumferential direction (50% or more). In other embodiments, the sheet 13 may not be provided on part of the outer periphery of the float assembly 11 (for example, parts corresponding to water intakes or catch basins, or parts where it is difficult to place the sheet 13, such as parts of access facilities to the float assembly 11).

[0038] FIG. 2 is a side view of the left half of the covering structure 10 shown in FIG. 1. Note that FIG. 2 shows the state when the water storage facility 1 is full of water. As shown in FIG. 2, the water storage facility 1 has a substantially horizontal bottom surface 4 and a slope 5 that extends at an angle from the outer periphery of the bottom surface 4. The bottom surface 4 is rectangular, and four slopes 5 extend from the four sides of the bottom surface 4. The bottom surface 4 and the slopes 5 are covered with a non-permeable waterproof sheet 6. This prevents the water 2 stored in the water storage facility 1 from leaking into the ground. The waterproof sheet 6 prevents the water level of the water storage facility 1 from decreasing due to ground leakage, and the covering structure 10 prevents the water level from decreasing due to evaporation into the atmosphere.

[0039] The main float 16 is arranged in a region of the water surface corresponding to the bottom surface 4 in a plan view. The cover-only float 18 is also arranged in a region of the water surface corresponding to the bottom surface 4 in a plan view. The sheet 13 is mainly arranged in a region of the water surface corresponding to the slope 5 in a plan view.

[0040] The sheet 13 has an inner edge 13a connected to the float assembly 11 via an inner connecting rope 20, and an outer edge 13b attached to the sloped portion 7 of the water storage facility 1, which is located outside the water surface when the water is full. The outer edge 13b of the sheet 13 is fixed to the sloped portion 7 by an anchor 21. The inner edge 13a of the sheet 13 is positioned below the float assembly 11 so as to overlap the float assembly 11. The inner connecting rope 20 connects the inner edge 13a of the sheet 13 to the outer periphery of the float assembly 11 (specifically, the cover-only float 18). The inner connecting rope 20 is shown with a dotted line to distinguish it from the sheet 13.

[0041] The water storage facility 1 and covering structure 10 are configured as described above. In this way, the covering structure 10 is provided with a plurality of solar panels 12, thereby enabling effective use of the water surface. The covering structure 10 also includes a float assembly 11 having a plurality of main floats 16, and a sheet 13 attached to the outer periphery of the float assembly 11. As a result, the water surface is covered by the covering structure 10, and when the water level of the water storage facility 1 changes, the covering structure 10 deforms in response to the change in water level, maintaining the entire water surface covered.

[0042] The operation of the covering structure 10 when the water level changes will be described below. Figure 3 is an explanatory diagram of the operation of the covering structure 10 when the water level drops. Figure 3 shows (A) a full water level state and (B) a low water level state where the water 2 has disappeared. When the water 2 is used for industrial or agricultural purposes and the water level of the water storage facility 1 drops, the covering structure 10 changes from the state shown in (A) to the state shown in (B).

[0043] As described above, the inner edge 13a of the sheet 13 is connected to the float assembly 11 via the inner connecting rope 20, and the outer edge 13b of the sheet 13 is attached to the shoulder 7 of the water storage facility 1, which is located outside the water surface when the water level is full. This prevents any part of the water surface from being uncovered by the sheet 13 when the water level changes.

[0044] Specifically, because the outer edge 13b of the sheet 13 is fixed to the slope 7 of the water storage facility 1, the inner edge 13a of the sheet 13 slides against the float assembly 11. In this embodiment, the inner edge 13a of the sheet 13 is arranged below the float assembly 11 so as to overlap the float assembly 11. Therefore, when the water level drops, the inner edge 13a of the sheet 13 slides against the underside of the float assembly 11. As the water level drops, the amount of overlap between the sheet 13 and the float assembly 11 decreases, and in the state shown in (B), the inner edge 13a of the sheet 13 is located outside the float assembly 11. However, the area of ​​the water surface outside the float assembly 11 remains covered by the sheet 13 until the water level approaches zero. Therefore, evaporation of the water 2 in the water storage facility 1 is effectively suppressed.

[0045] Fig. 4 is a plan view of the covering structure 10 when the water level drops. As shown in Fig. 3(B) and Fig. 4, the float assembly 11 comes into contact with the bottom surface 4 of the water storage facility 1 (specifically, the waterproof sheet 6 stretched over the bottom surface 4) when the water level drops. In other words, the float assembly 11 including the main float 16 is arranged in the area of ​​the water surface corresponding to the bottom surface 4 in a plan view. As a result, when the covering structure 10 comes into contact with the bottom surface 4 of the water storage facility 1, the heavy main float 16 supporting the solar panels 12 comes into contact with the waterproof sheet 6 at the bottom surface 4, thereby preventing damage to the waterproof sheet 6.

[0046] As described above, a plurality of cover floats 18 that do not support the solar panels 12 are provided on the outer periphery of the main float 16. Therefore, even if the distance from the main float 16 to the outer periphery of the water surface is large as shown in Figure 3(A), the width of the sheet 13 is prevented from becoming excessively large. This prevents the sheet 13 from being blown around by the wind.

[0047] 3(B) and 4, the covering float 18 is also arranged in a region of the water surface that corresponds to the bottom surface 4 of the water storage facility 1 in a plan view. This prevents the covering float 18 from coming into contact with the waterproof sheet 6 on the slope 5 and damaging the waterproof sheet 6 when the water level drops and the covering structure 10 comes into contact with the bottom surface 4 of the water storage facility 1. Therefore, it becomes possible to form the covering float 18 from a hard material like the main float 16, and the weather resistance of the covering float 18 can be improved.

[0048] Figure 5 is an explanatory diagram of the operation of the covering structure 10 when the water level rises. Figure 5 shows (A) a low water level state with no water 2, and (B) a full water level state with increased water 2. When the water storage facility 1 is constructed or when water storage is required, water 2 is supplied from a river or the like, and the water level of the water storage facility 1 rises, the covering structure 10 changes from the state shown in (A) to the state shown in (B).

[0049] At this time, the inner edge 13a of the sheet 13 is positioned outside the float assembly 11, so the sheet 13 is in a slack state. As described above, the inner edge 13a of the sheet 13 is connected to the float assembly 11 by the inner connecting rope 20. Therefore, by having an operator pull the inner connecting rope 20 on the float assembly 11, the sheet 13 can be placed in the state shown in Figure 3(A), where the inner edge 13a of the sheet 13 overlaps under the float assembly 11.

[0050] Second Embodiment Next, a second embodiment of the present invention will be described with reference to Figures 6 to 8. Elements that are the same as or similar to those in the first embodiment are given the same reference numerals, and duplicated explanations will be omitted. Unless otherwise specified, the same applies to the following embodiments.

[0051] Fig. 6 is a side view of the left half of the covering structure 10 of the water storage facility 1 according to the second embodiment, and corresponds to Fig. 2. As shown in Fig. 6, in this embodiment, the inner edge 13a of the sheet 13 is arranged above the float assembly 11 so as to overlap the float assembly 11.

[0052] Fig. 7 is an explanatory diagram of the operation of the covering structure 10 when the water level drops, and Fig. 8 is an explanatory diagram of the operation of the covering structure 10 when the water level rises. Fig. 7(A) corresponds to Fig. 3(A), and Fig. 7(B) corresponds to Fig. 3(B). Fig. 8(A) corresponds to Fig. 5(A), and Fig. 8(B) corresponds to Fig. 5(B).

[0053] As shown in FIG. 7, in this embodiment, the inner edge 13a of the sheet 13 is disposed above the float assembly 11, so that when the water level drops, the inner edge 13a of the sheet 13 slides over the float assembly 11. As the water level drops, the amount of overlap between the sheet 13 and the float assembly 11 decreases, and in the state shown in (B), the inner edge 13a of the sheet 13 is located outside the float assembly 11. However, until the water level approaches zero, the area of ​​the water surface outside the float assembly 11 remains covered by the sheet 13. Therefore, evaporation of the water 2 in the water storage facility 1 is effectively suppressed.

[0054] As shown in FIG. 8, when the water level of the water storage facility 1 rises, the covering structure 10 changes from the state shown in (A) to the state shown in (B). At this time, the inner edge 13a of the sheet 13 is located outside the float assembly 11, so the sheet 13 is in a slack state. As described above, the inner edge 13a of the sheet 13 is connected to the float assembly 11 by the inner connecting rope 20. Therefore, by pulling the inner connecting rope 20 on the float assembly 11, a worker can bring the sheet 13 into the state shown in FIG. 7(A), where the inner edge 13a of the sheet 13 overlaps the float assembly 11. At this time, because the inner edge 13a of the sheet 13 overlaps the float assembly 11, the work is easier than in the first embodiment.

[0055] Third Embodiment Next, a third embodiment of the present invention will be described with reference to Figures 9 to 11. Figure 9 is a side view of the left half of a covering structure 10 for a water storage facility 1 according to the third embodiment. As shown in Figure 9, in this embodiment, the covering float 18 is arranged further outside the water storage facility 1 than in the first embodiment, specifically, so as to extend to the area of ​​the water surface corresponding to the slope 5 of the water storage facility 1 in plan view. The covering float 18 in this embodiment is made of a softer material than the main float 16. The covering float 18 may be made of expanded polystyrene, for example. The width of the sheet 13 is narrower by the amount that the width of the covering float 18 is wider.

[0056] Fig. 10 is an explanatory diagram of the operation of the covering structure 10 when the water level drops, and Fig. 11 is an explanatory diagram of the operation of the covering structure 10 when the water level rises. Fig. 10(A) corresponds to Fig. 3(A), and Fig. 10(B) corresponds to Fig. 3(B). Fig. 11(A) corresponds to Fig. 5(A), and Fig. 11(B) corresponds to Fig. 5(B).

[0057] As shown in Figure 10, when the water level drops, the inner edge 13a of the sheet 13 slides along the underside of the float assembly 11. As the water level drops, the amount of overlap between the sheet 13 and the float assembly 11 decreases, and in the state shown in (B), the inner edge 13a of the sheet 13 is located outside the float assembly 11. The covering float 18 arranged on the outside of the float assembly 11 comes into contact with the slope 5 of the water storage facility 1 (specifically, the waterproof sheet 6 stretched over the bottom surface 4) when the water level drops.

[0058] However, since the cover-only float 18 is made of a softer material than the main float 16, damage to the waterproof sheet 6 is suppressed. On the other hand, since the width of the sheet 13 is narrowed by the amount that the width of the cover-only float 18 is increased, the sheet 13 is further suppressed from being blown by the wind.

[0059] As shown in Figure 11, when the water level in the water storage facility 1 rises, the covering structure 10 changes from the state shown in (A) to the state shown in (B). At this time, the inner edge 13a of the sheet 13 is located outside the float assembly 11, so the sheet 13 becomes slack, but an operator can pull the inner connecting rope 20 on the float assembly 11 to return it to the state shown in Figure 10(A).

[0060] Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to Figures 12 to 14. Figure 12 is a plan view of a covering structure 10 according to the fourth embodiment. In this embodiment, the inner connecting ropes 20 (Figure 2) connecting the sheet 13 to the float assembly 11 are not provided, and instead, outer connecting ropes 30 connecting the sheet 13 to the slope shoulder 7 are provided. Specifically, the inner edge 13a of the sheet 13 is connected to the float assembly 11, and the outer edge 13b of the sheet 13 is connected to the slope shoulder 7 of the water storage facility 1 via the outer connecting ropes 30. The outer connecting ropes 30 have a length that is sufficiently longer than the distance from the outer edge 13b of the sheet 13 to the anchor 21 in the full-water state shown in Figure 12, and are arranged in a slack or wound state around the slope shoulder 7.

[0061] Fig. 13 is an explanatory diagram of the operation of the covering structure 10 when the water level drops, and Fig. 14 is an explanatory diagram of the operation of the covering structure 10 when the water level rises. Fig. 13(A) corresponds to Fig. 3(A), and Fig. 13(B) corresponds to Fig. 3(B). Fig. 14(A) corresponds to Fig. 5(A), and Fig. 14(B) corresponds to Fig. 5(B).

[0062] As shown in FIG. 13 , in this embodiment, the inner edge 13a of the sheet 13 is attached to the float assembly 11, so when the water level drops, the inner edge 13a of the sheet 13 drops along with the float assembly 11. As the water level drops, the sheet 13 comes into contact with the slope 5 of the water storage facility 1, starting from the outer edge 13b, and slides downward along the slope 5 while pulling the outer connecting rope 30. In the state shown in (B), most of the sheet 13 covers the slope 5. However, the area of ​​the water surface outside the float assembly 11 remains covered by the sheet 13. Therefore, evaporation of the water 2 in the water storage facility 1 is effectively suppressed.

[0063] As shown in Figure 14, when the water level of the water storage facility 1 rises, the covering structure 10 changes from the state shown in (A) to the state shown in (B). At this time, the position of the outer edge 13b of the sheet 13 in Figure 14(A) is closer to the float assembly 11 than the position in Figure 13(A), so the sheet 13 is in a slack state.

[0064] In this embodiment, the sheet 13 has an inner edge 13a attached to the float assembly 11 and an outer edge 13b connected via outer connecting ropes 30 to the slope 7 of the water storage facility 1, which is located outside the water surface when the water level is full. Specifically, the outer edge 13b of the sheet 13 is connected to the anchor 21 by the outer connecting ropes 30. Therefore, after the water level rises, workers can unfold the sheet 13 so that it covers the water surface by pulling the outer connecting ropes 30. Since there is no need to overlap the sheet 13 with the float assembly 11, the work is easy.

[0065] Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to Figures 15 to 17. In this embodiment, explanations that overlap with the fourth embodiment will be omitted, and only differences from the fourth embodiment will be described.

[0066] Fig. 15 is a plan view of the covering structure 10 for the water storage facility 1 according to the fifth embodiment. In this embodiment, the outer connecting ropes 30 are formed of expandable ropes made of an elastic material. Therefore, the outer connecting ropes 30 are not in a slack state as shown in Fig. 12.

[0067] Fig. 16 is an explanatory diagram of the operation of the covering structure 10 when the water level drops, and Fig. 17 is an explanatory diagram of the operation of the covering structure 10 when the water level rises. Fig. 16(A) corresponds to Fig. 13(A), and Fig. 16(B) corresponds to Fig. 13(B). Fig. 17(A) corresponds to Fig. 14(A), and Fig. 17(B) corresponds to Fig. 14(B).

[0068] As shown in Figure 16, in this embodiment, the outer connecting rope 30 is extendable, so when the water level drops, the outer connecting rope 30 extends as the distance from the anchor 21 to the outer edge 13b of the sheet 13 increases.

[0069] As shown in Figure 17, when the water level in the water storage facility 1 rises, the covering structure 10 changes from the state shown in (A) to the state shown in (B). At this time, because the outer connecting ropes 30 are pulling the outer edge 13b of the sheet 13, the sheet 13 does not become slack, and even if the outer connecting ropes 30 are no longer pulled, the sheet 13 returns to the state shown in Figure 16(A) in which the sheet 13 covers the water surface. This makes maintenance of the covering structure 10 easy.

[0070] Although the description of specific embodiments has been completed above, the present invention is not limited to the above-described embodiments and modifications, and can be implemented in a wide variety of ways. For example, instead of the outer connecting rope 30 being an extensible rope, a winding device that winds the outer connecting rope 30 at a predetermined tension may be provided at the slope shoulder 7. In the above-described embodiments, the water storage facility 1 is rectangular in plan view, but the shape of the water storage facility 1 is not limited to this. Furthermore, the bottom surface 4 and slope 5 of the water storage facility 1 may be covered with concrete. The specific configuration, arrangement, quantity, and material of each component and part may be modified as appropriate without departing from the spirit of the present invention. Furthermore, some or all of the components of the above-described embodiments may be combined with each other. Meanwhile, not all of the components shown in the above-described embodiments are necessarily required and may be selected as appropriate. [Explanation of symbols]

[0071] 1: Water storage facility 2:Water 4: Bottom 5: Slope 6:Waterproof sheet 7: Shoulder part 10: Covering structure 11: Float assembly 12: Solar panels 13: Sheet 13a: Common-law marriage 13b: outer edge 16: Main float 17: Connected float 18: Float for coating only 19:Connection means 20: Inner connecting rope 21: Anchor 30: Outer connecting rope

Claims

1. A covering structure for covering the water surface of a water storage facility, a float assembly provided on the water surface and including a plurality of main floats; a sheet provided on the outer periphery of the float assembly to cover the water surface; a plurality of solar panels supported by the main float; The water storage facility has a substantially horizontal bottom surface and a slope extending obliquely from an outer edge of the bottom surface, The main float is disposed in a region of the water surface corresponding to the bottom surface in a plan view, The sheet is arranged in a ring shape around the float assembly, and at least a portion of the sheet has an inner edge attached to the float assembly and an outer edge connected via an outer connecting rope to a portion of the water storage facility that is located outside the water surface when the facility is full of water, A covering structure for a water storage facility, wherein the outer connecting rope is an elastic rope made of an elastic material.

2. 2. The covering structure for a water storage facility according to claim 1, wherein the water storage facility is an artificial reservoir whose bottom and slope are covered with a non-permeable waterproof sheet.

3. The covering structure for a water storage facility according to claim 1 or 2, wherein the float assembly further comprises a plurality of cover-only floats arranged on the outer periphery of the main float and not supporting the solar panels.

4. 4. The covering structure for a water storage facility according to claim 3, wherein the covering float is arranged in a region of the water surface corresponding to the bottom surface in a plan view.

5. A covering structure for a water storage facility as described in claim 4, wherein the covering float is formed from a material softer than the main float and is further arranged in an area of ​​the water surface corresponding to the slope in a plan view.

6. A covering structure for a water storage facility described in any one of claims 1 to 5, wherein a portion of the sheet has an inner edge connected to the float assembly via an inner connecting rope and an outer edge attached to a part of the water storage facility that is located outside the water surface when the water storage facility is full.

7. 7. A covering structure for a water storage facility according to claim 6, wherein the inner edge of at least a part of the sheet is arranged below the float assembly so as to overlap the float assembly.

8. 7. A covering structure for a water storage facility according to claim 6, wherein the inner edge of at least a part of the sheet is arranged above the float assembly so as to overlap the float assembly.

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