River structure

Abstract

To provide a river structure that can effectively utilize river water.SOLUTION: A structure is installed between a river R and an embankment B and includes a base structure 102 having a floor surface 102b at a predetermined critical liquid level, a facility structure 110 installed above the base structure 102 with a space therebetween and having a hollow space 110h therein, a storage tank 105 for storing water from the river R installed on a bottom floor LB of a low water channel LR of the river R upstream of the base structure 102, a supply unit 130 for supplying water from the storage tank 105 to the hollow space 110h of the facility structure 110, a fall channel 140 installed downstream of the facility structure 110 and for dropping water from the hollow space 110h of the facility structure 110 into the river R, and a generator 145 installed in the fall channel 140. The storage tank 105 has an inner bottom 105b located below the bottom floor LB of the low water channel LR of the river R.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to river structures.

Background Art

[0002] In recent years, due to huge typhoons, concentrated heavy rains, etc., river embankments in various places have been breached, causing great damage. Many river embankments have been built with earth dams using various soil materials since ancient times, and there have been many reports of cases where the dams are breached due to overtopping during floods, seepage within the earth dams, or erosion.

[0003] As a dam reinforcement structure for reinforcing such existing dams, the technology described in Patent Document 1 has been developed. The technology of Patent Document 1 is to construct the surface of the dam with improved soil formed by mixing in-situ soil and sand, cementitious material, short fiber material, water-proof material, and water that constitute the dam or the surrounding ground of the dam.

[0004] Further, Patent Document 2 discloses a technology for constructing the ground around a river by installing sheet piles at a certain distance from the bank and pouring and solidifying a mixture of sludge at the bottom of the river and cement between the sheet piles and the bank.

[0005] Further, Patent Document 3 discloses a technology for forming a revetment by stacking and arranging revetment blocks having openings at the top on the surface of the dam.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the technologies disclosed in Patent Documents 1 and 2 are merely for constructing the ground on the surface of the dike or on the low-waterway side with respect to the dike, and the technology of Patent Document 3 is a technology for reinforcing the surface of the dike by arranging the surface of the dike or the revetment blocks. None of these technologies is a technology for forming a revetment separately from the existing dike. Also, with the technologies of Patent Documents 1 to 3, even if the existing dike can be strengthened, it cannot sufficiently prevent floods, and there is a need for a technology that can more effectively prevent floods.

[0008] In addition, shortages in the supply of drinking water, electricity, etc. occur not only in floods but also in various disasters. It would be effective if the water in the river could be used as a supply source or power source for drinking water during disasters. However, the facilities for effectively utilizing the water in the river during disasters are not sufficient.

[0009] In view of the above circumstances, an object of the present invention is to provide a river structure that can effectively utilize the water in the river.

Means for Solving the Problems

[0010] <River Structure> The river structure of the first invention includes a main body having a hollow space in which a power generation device is provided, and storage portions provided in front of and behind the main body. A flow path space extending in the front-rear direction of the main body is provided in the hollow space of the main body. The flow path space is provided with a plurality of accommodation compartments divided by a plurality of separation walls provided at intervals along the extending direction thereof. Inside the accommodation compartments, a pipe and a power generation device that generates electricity by the water flowing through the pipe are provided. The pipe is provided such that water flows between the storage portions provided in front of and behind the main body by connecting the pipes inside each accommodation compartment. Between adjacent accommodation compartments, it has a structure in which water flows from one accommodation compartment to another by the siphon effect. In the river structure of the second invention, in the first invention, the flow path space includes a forward flow path space in which water flows from a storage section provided in front of the main body to a storage section provided behind the main body by the siphon effect, and a reverse flow path space provided in parallel with the forward flow path space and in which water flows from a storage section provided behind the main body to a storage section provided in front of the main body by the siphon effect. In the river structure of the third invention, in the second invention, the storage section includes an adjacent storage section adjacent to the main body and a distant storage section provided outside the adjacent storage section. A forward flow path pipe that is provided in parallel with the forward flow path space and allows water to flow from the distant storage section located in front of the main body to the distant storage section located behind the main body, and a reverse flow path pipe that is provided in parallel with the reverse flow path space and allows water to flow from the distant storage section located behind the main body to the distant storage section located in front of the main body are provided. An emergency water supply section that blocks communication between the forward flow path pipe and the pipe provided in the forward flow path space is provided in the forward flow path pipe, and an emergency water supply section that blocks communication between the reverse flow path pipe and the pipe provided in the reverse flow path space is provided in the reverse flow path pipe. In the river structure of the fourth invention, in the first invention, the main body has a float structure that can float on the water of the river. <River structure> The river structure of the fifth invention is a structure provided between a river and a levee, and includes a base structure body having a floor surface at a predetermined limit liquid level height, a facility structure body provided at an interval above the base structure body and having a hollow space inside, a storage tank provided on the bottom floor of the lower waterway of the river upstream of the base structure body for storing river water, a supply section for supplying the water in the storage tank to the hollow space of the facility structure body, a falling flow path provided on the downstream side of the facility structure body for dropping the water in the hollow space of the facility structure body into the river, and a generator provided in the falling flow path. The storage tank has an inner bottom located below the bottom floor of the lower waterway of the river. In the river structure of the sixth invention, in the fifth invention, the hollow space of the facility structure includes a water receiving tank for storing the water supplied from the supply unit, a drainage tank for storing the water drained into the falling flow path, and a water purification facility provided between the water receiving tank and the drainage tank. The river structure of the seventh invention is characterized in that, in the fifth or sixth invention, a flow path space for flowing the water of the river is provided between the base structure and the facility structure. The river structure of the eighth invention is characterized in that, in the fifth or sixth invention, the facility structure is provided with a ceiling member covering the hollow space, and the ceiling member is provided with a solar power generation panel. The river structure of the ninth invention is characterized in that, in the fifth or sixth invention, on the upstream side of the base structure, at the boundary between the low water channel and the high water area in the river, a pair of revetment structures formed by a plurality of revetment boxes arranged along the flowing direction of the river are provided on a flat installation bottom formed by excavating the boundary along the flowing direction of the river. Each revetment box encloses the sediment dredged from the bottom floor of the low water channel and the sediment of the shoal inside a hollow box-shaped body.

Advantages of the Invention

[0011] <River Structure> According to the first invention, power generation using water can be efficiently carried out. According to the second invention, since the water in the storage part can be circulated and utilized, power generation can be carried out by efficiently using water. According to the third invention, even when the piping is clogged or some of the power generation devices fail, power generation can be continued. According to the fourth invention, since the river can be moved, power can be supplied to a desired location. <River Structure> According to the fifth invention, it becomes easier to effectively utilize the water of the river. According to the sixth invention, if the water of the river is purified by the water purification facility, the water of the river can be used as drinking water or domestic water. Then, the water of the river can be effectively utilized in case of disasters. According to the seventh invention, even when the river level rises, power generation and the like can be carried out while preventing damage to equipment structures and the like. According to the eighth invention, the area where the equipment structure is provided can be effectively utilized for power generation. According to the ninth invention, since a pair of revetment structures formed by arranging a plurality of revetment boxes side by side are provided at the boundary between the low water channel and the high water bank in the river, the strength of the levee can be increased. Moreover, since the dredged sediment of the bottom floor of the low water channel and / or the sediment of the mid-channel is accommodated in the revetment box, the water flow in the low water channel can be improved and the treatment of the dredged sediment is also facilitated.

Brief Description of the Drawings

[0012]

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Mode for Carrying Out the Invention

[0013] The river structure of the present embodiment can efficiently carry out power generation using the water of the river, so that power and the like can be provided to residents and enterprises during normal times and disasters.

[0014] First, a method for reclaiming the river will be described so that the river where the river structure of the present embodiment is provided does not flood. By modifying the river by such a river modification method, flooding of the river can be prevented, so that the river structure of the present embodiment can be stably operated. Also, sand and the like in the river can be effectively utilized.

[0015] <Structure of the River> First, the structure of the river where the river structure of the present embodiment is provided will be described.

[0016] As shown in Fig. 2(A), the river R where the river structure of the present embodiment is provided has a low water channel LR, a high floodplain HR, and a levee B. The low water channel LR is a water channel where water W always flows, and the high floodplain HR is a water channel that is one level higher than the low water channel LR, and is an area where water W flows when the amount of water flowing in the river R increases, for example, during a flood. The dike B is designed to safely allow the water W to flow when the water level is below the planned high water level. In the following method for river improvement of the present embodiment, although the width of the low water channel LR may narrow, even if the amount of water at the planned high water level in the river R before improvement flows into the river R after improvement, the planned high water level is designed to hardly change.

[0017] <Method for River Improvement> The method for improving the river R where the river structure of the present embodiment is provided is a method adopted when improving the river R having a structure as shown in Fig. 2(A). In this method for improving the river R, it is a method of installing the revetment structure 1 as shown in Fig. 1 in the river R having a structure as shown in Fig. 2(A).

[0018] <Revetment Structure 1> As shown in Fig. 1, the revetment structure 1 is provided with a pair of revetment walls 2 formed by arranging a plurality of revetment boxes 10 side by side at the boundary between the low water channel LR and the high water bank HR. That is, a pair of revetment walls 2, 2 are provided so as to sandwich the low water channel LR from the direction intersecting the direction (hereinafter sometimes referred to as the flow path direction D) in which the water W flows.

[0019] Each revetment box 10 constituting the revetment wall 2 is installed on the installation base SB (hereinafter sometimes simply referred to as the installation base SB) formed on the bottom bed LB of the low water channel LR at the boundary portion between the low water channel LR and the high water bank HR in a state of containing the sediment dredged from the bottom bed LB and / or the mid-channel SD of the low water channel LR in the improvement method described later.

[0020] The revetment box 10 is a rectangular parallelepiped having a hollow space inside, and is formed, for example, by connecting metal iron plates such as stainless steel by welding or the like. The revetment box 10 is formed, for example, by connecting stainless steel plates with a thickness of 2 to 3 mm to have a height of 3 to 8 m (preferably 5 to 6 m), a depth of 2 to 5 m (preferably 3 to 5 m), and a width of 2 to 6 m (preferably 5 to 6 m) in terms of height.

[0021] The revetment box 10 is formed by closing the opening 11a of the bottomed rectangular tube-shaped main body 11 having an opening at the upper end with a lid member 12. Specifically, after filling the hollow space 11h with earth and sand through the opening 11a, the lid member 12 is attached to the opening 11a of the main body 11 by a method such as welding (see Fig. 1(A)). That is, the revetment box 10 is completed after being installed on the installation base SB formed on the bottom floor LB of the low water channel LR.

[0022] And a pair of revetment walls 2, 2 are formed by connecting a plurality of revetment boxes 10. Specifically, after a plurality of revetment boxes 10 are arranged side by side on the installation base SB along the flow path direction D, a pair of revetment walls 2, 2 are formed by connecting adjacent revetment boxes 10.

[0023] <Regarding the method of river renovation> A method of forming the revetment structure 1 having a pair of revetment walls 2, 2 as described above will be described below.

[0024] First, excavation or the like is carried out so as to approximate the bottom floor LB of the low water channel LR to horizontal at the boundary between the low water channel LR and the high water bank HR where the revetment box 10 is to be installed, and the installation base SB is formed (see Fig. 2(B)). The installation base SB is formed along the flow path direction D for a predetermined length (for example, 1 km, etc.).

[0025] After forming the installation base SB, the main bodies 11 of the revetment boxes 10 are arranged side by side over the entire area where the installation base SB is provided along the length direction of the installation base SB (that is, the flow path direction D). At this time, the main bodies 11 of the revetment boxes 10 are arranged so that their openings 11a face upward (see Fig. 2(C)).

[0026] When the main body 11 of the revetment box 10 is installed on the installation base SB, the main bodies 11 of adjacent revetment boxes 10 are connected by methods such as welding or bolt connection to form a row of revetment boxes. When the row of revetment boxes is formed, a dredging device 30 equipped with a dredging device 32 is floated on the water W of the river R in the floating body 31, and the sediment on the bottom LB of the low water channel LR and / or the sandbar SD is dredged (see Fig. 2(C)). Then, the dredged sediment is put into the space 11h of the main bodies 11 of the plurality of revetment boxes 10 by the dredging device 32 of the dredging device 30.

[0027] By performing the above operations while moving the dredging device 30 along the flowing direction of the river R, the dredged sediment is put into the space 11h of the main bodies 11 of the plurality of revetment boxes 10 in the row of revetment boxes by the dredging device 32. Note that "performing the above operations while moving the dredging device 30 along the flowing direction of the river R" includes both the case of performing the dredging operation and the operation of putting the sediment into the space 11h of the main body 11 while moving the dredging device 30, and the case of stopping the dredging device 30 during the dredging operation and the operation of putting the sediment into the space 11h of the main body 11.

[0028] When sediment is put into the space 11h of the main bodies 11 of all the revetment boxes 10 forming the row of revetment boxes, the lid member 12 is arranged at the opening 11a of the main body 11, the lid member 12 and the main body 11 are connected, and the space 11h of the main body 11 is sealed by the lid member 12. The connection between the lid member 12 and the main body 11 is carried out by welding. For example, a welding machine moving along the dike B of the river R is provided, and the lid member 12 and the main body 11 of all the revetment boxes 10 are connected by this welding machine to seal all the revetment boxes 10 in the row of revetment boxes, and then the revetment wall 2 is completed. Then, if the revetment walls 2 are formed on both banks, the revetment structure 1 can be formed over a predetermined length along the flow path direction D (see Fig. 2(D)).

[0029] If the revetment structure 1 is formed by the above method, the sediment on the bottom LB of the low water channel LR and the sandbar SD can be removed from the low water channel LR, so that the water flow of the river R can be maintained in a stable state and the flooding of the river R can be easily suppressed.

[0030] In addition, since the earth and sand removed from the bottom floor LB of the low water channel LR and the sandbar SD can be stored in the revetment box 10 that constitutes the revetment wall 2, the treatment of the earth and sand becomes easy, and the removed earth and sand can be effectively used for the revetment.

[0031] Further, if the revetment box 10 for storing earth and sand is formed of a metal with high corrosion resistance, the boundary portion between the low water channel LR and the high water embankment HR can be strengthened over a long period, so that the strength of the river R can be increased over a long period. Note that, for the portion that is constantly immersed in water, it does not have to be made of a metal with high corrosion resistance, and it may be formed of a general steel plate.

[0032] In the river R where the revetment structure 1 is formed, since a pair of revetment walls 2, 2 are installed and the bottom floor LB of the low water channel LR is dredged, the width of the portion where the normal water W flows, that is, the portion corresponding to the low water channel LR, becomes narrower than the width of the original low water channel LR, and the depth of the low water channel LR becomes deeper than the depth of the original low water channel LR. For example, in the river R where the revetment structure 1 is formed, the width of the portion corresponding to the low water channel LR can be about 1 / 2 of the width of the original low water channel LR, and the depth of the portion corresponding to the low water channel LR can be about 3 to 6 times the depth of the original low water channel LR. Therefore, when the river structure 200 described later is floated on the water W of the river R with a float structure, it can be stably floated on the water W, and the movement of the river structure 200 along the river R becomes easy. Note that, in the river R where the revetment structure 1 is formed, the width and depth of the portion corresponding to the low water channel LR are not limited to the above ranges, and may be appropriately adjusted according to the state of the river R, the shape and size of the river structure 100, and the shape and size of the river structure 200.

[0033] <Regarding the fixation of the revetment box 10> Among the plurality of revetment boxes 10, adjacent revetment boxes 10 are connected by methods such as welding and bolting, but the method of connecting adjacent revetment boxes 10 is not particularly limited.

[0034] In addition, each revetment box 10 contains sediment, and even just one revetment box 10 weighs several tons or more. Therefore, if a plurality of revetment boxes 10 are connected, it is not necessarily required to fix the revetment boxes 10 to the bottom floor LB of the low water channel LR with piles or the like. However, in order to enhance the stability of the pair of revetment walls 2, 2, it is desirable to fix all or some of the plurality of revetment boxes 10 to the bottom floor LB of the low water channel LR with piles or the like.

[0035] <Regarding the shape of the revetment box 10> The size of the revetment box 10 is not limited to the size described above. The size of the revetment box 10 may be appropriately formed according to the size and shape of the river R (for example, the size of the step between the low water channel LR and the high floodplain HR, etc.) formed by the pair of revetment walls 2, 2 by the revetment box 10.

[0036] In addition, the shape of the revetment box 10 is not limited to the shape described above. The revetment box 10 may have, for example, a cross-section that is a polygon such as a triangle or a pentagon, or may have a circular cross-section. Also, the revetment box 10 is not limited to a rectangular parallelepiped and may be a cube. The revetment box 10 may be appropriately formed in an appropriate size and shape according to the state of the river R formed by the pair of revetment walls 2, 2 by the revetment box 10. Note that, in order to strengthen the connection between adjacent revetment boxes 10, it is desirable that the side surface is flat. That is, it is desirable that the surface where adjacent revetment boxes 10 contact each other is flat.

[0037] In addition, the revetment boxes 10 forming the pair of revetment walls 2, 2 do not necessarily have to be all of the same size and the same shape. According to the size and shape of the river R (for example, the size of the step between the low water channel LR and the high floodplain HR, etc.), revetment boxes 10 of different shapes and different sizes may be appropriately used.

[0038] <Dredging device 30> The dredging device 30 may adopt any structure as long as it can dredge the sediment on the bottom LB of the low water channel LR and / or the sandbar SD. A dredging machine that can move the dike B and the high water area HR or a dredging machine that can move within the low water channel LR, for example, a GNSS-compatible mini excavator car, etc., can be used as the dredging device 30. However, as described above, if the dredging device 30 is formed by providing the dredging equipment 32 on the floating body 31 so that it can float and move on the water W of the river R, the movement of the dredging device 30 becomes easy, and the work of removing the sediment on the bottom LB of the low water channel LR and / or the sandbar SD can be efficiently carried out.

[0039] In this case, the structure of the floating body 31 is not particularly limited as long as it has a structure that can stably perform the dredging operation even when the dredging equipment 32 is placed on it. For example, the floating body 31 may be a hollow plate-like structure formed of stainless steel or the like, and it may have a sufficiently large area and a volume capable of generating sufficient buoyancy (see Fig. 3). Also, the floating body 31 may be formed by connecting a plurality of hollow-structured box bodies that can be connected and separated.

[0040] The dredging equipment 32 provided on the floating body 31 may be, for example, a GNSS-compatible mini excavator car or the like, but the equipment as shown in Fig. 3 may also be used. As shown in Fig. 3, an opening 31h that penetrates vertically is provided in the central part of the floating body 31, and a dredging container 33 that can pass through this opening 31h, a lifting device 34 that raises and lowers this dredging container 33, and a suction device 35 such as a pump that sucks the inside of the dredging container 33 are used to form the dredging equipment 32. In this case, the dredging container 33 is a hollow box-shaped body surrounded by a ceiling wall 33b and a side wall 33c and having an opening 33a at the lower end. Although not shown, the lifting device 34 is provided with a function of generating a biasing force that presses the dredging container 33 downward. A through hole 33h is provided in the ceiling wall 33b of the dredging container 33, and a pipe 36 such as a pipe of the suction device 35 is connected to this through hole 33h. That is, the suction device 35 can suck the objects inside the dredging container 33 through the through hole 33h.

[0041] When using such dredging equipment 32, the sediment on the bottom LB of the low water channel LR and / or on the mid-channel SD can be dredged as follows.

[0042] First, with the opening 31h of the floating body 31 arranged above the sediment to be dredged, stop the movement of the dredging device 30. In this state, lower the dredging container 33 by the lifting device 34. Then, when the lower end of the dredging container 33 is placed on the upper surface of the sediment, press the dredging container 33 downward by the lifting device 34 to push the lower end of the dredging container 33 into the sediment. When the suction device 35 is operated in this state, the sediment is sucked in by the suction device 35, so that the sediment can be removed from the bottom LB of the low water channel LR and / or the mid-channel SD. If the pipe 37 for discharging the sediment sucked in by the suction device 35 is arranged in the space 11h of the main body 11 of the revetment box 10, the sediment can be supplied into the space 11h of the main body 11 of the revetment box 10 (see Fig. 2(C)).

[0043] If the dredging container 33 is to be stably lifted and lowered through the opening 31h of the floating body 31, it is desirable to provide a guide rail on the floating body 31 to guide the movement of the dredging container 33. For example, a rail extending vertically from the opening 31h of the floating body 31 may be provided, and the dredging container 33 may be lifted and lowered along the rail.

[0044] <Dredging equipment 40> In addition, a dredging device 40 for scooping up the sediment in the dredging container 33 may be provided in the dredging container 33. If the dredging device 40 is provided with a container 41 and the container 41 is used to scoop up sediment, stones, etc., stones that cannot be sucked into the pipe 36 can be scooped up and removed.

[0045] For example, as shown in FIG. 5, as the container 41, a container having a bottom plate 41b, a pair of side plates 41s, 41s provided on the side surfaces of the bottom plate 41b, and a partition plate 41d connecting between the pair of side plates 41s, 41s is provided. That is, a container 41 with an open upper part and both end parts (end parts in the left - right direction in FIG. 5) is provided. And the container 41 can be moved along the left - right direction (the direction of arrow X in FIG. 5) by a wire 42 or the like. Then, if the container 41 is moved in the direction of arrow X, stones and earth and sand can be scooped into the container 41 from the openings 41a provided at both end parts of the container 41.

[0046] When providing such dredging equipment 40, a dredging container 33 having a structure without a ceiling wall 33b is used. Then, if the container 41 can be lifted and lowered in the dredging container 33, when stones or the like that cannot be sucked into the pipe 36 are scooped up, if the container 41 is lifted until its opening 41a is located above the upper end of the dredging container 33, the stones or the like that cannot be sucked into the pipe 36 can be discharged onto the floating body 31. Then, the stones or the like can be put into the space 11h of the main body 11 of the revetment box 10 from the floating body 31 by a heavy machine or the like or transported to other places. Also, the stones or the like can be directly carried out from above the container 41 by a heavy machine or the like and put into the space 11h of the main body 11 of the floating revetment box 10 or transported to other places.

[0047] Also, if the pipe 36 can be fixed to the container 41, the earth and sand on the bottom bed LB of the low water channel LR and the sandbar SD, from which stones or the like that cannot be sucked into the pipe 36 have been removed, can be sucked up by the pipe 36 (see FIG. 6). And since the pipe 36 is fixed to the container 41, if the container 41 is moved, the position of the tip of the pipe 36 can be freely adjusted in the dredging container 33. Then, the earth and sand in the dredging container 33 can be surely sucked up.

[0048] Alternatively, a crushing device 43g such as a pick hammer or a concrete breaker may be provided in the container 41 (see Fig. 6). In this case, the tip of the crushing device 43g is made to protrude from the lower surface of the bottom plate 41b of the container 41. Then, if the container 41 is moved downward and the crushing device 43g is operated with the tip of the crushing device 43g in contact with the sediment or rock on the bottom bed LB of the low water channel LR or the sandbar SD, the sediment or rock on the bottom bed LB of the low water channel LR or the sandbar SD can be crushed. In this case, if the pipe 36 is fixed to the container 41, the crushed stones or the like can be sucked up by the pipe 36. Of course, after crushing the sediment or rock on the bottom bed LB of the low water channel LR or the sandbar SD, the container 41 may be lifted once, the pipe 36 may be fixed to the container 41, and then the container 41 may be moved to place the pipe 36 at the position of the crushed stones or the like and sucked up by the pipe 36.

[0049] Alternatively, the container 41 may be fixed in the dredging container 33 without being movable. Even in this case, if the dredging device 30 itself is moved, stones and sediment can be scooped up by the container 41.

[0050] Alternatively, a pick hammer, a concrete breaker, or the like as described above may be provided in the container 41. In this case, if the tip of the pick hammer, the concrete breaker, or the like protrudes from the lower surface of the bottom plate 41b of the container 41, the bottom bed LB of the low water channel LR or the sandbar SD can be crushed, and the crushed stones, sediment, or the like can also be scooped up by the container 41.

[0051] Alternatively, a container 41 may be provided separately from the dredging container 33. Even in this case, if the container 41 is provided movably with respect to the floating body 31 and the container 41 is moved by a wire 42 or the like, or if the container 41 is fixed to the dredging device 30 but the dredging device 30 itself is moved, stones and sediment can be scooped up by the container 41.

[0052] Furthermore, a floating body different from the floating body 31 provided with the dredging container 33 and the suction device 35 may be provided, and the container 40 may be provided on this floating body.

[0053] In addition, it is desirable that the lifting device 34 has a frame 34F provided with rails for holding the dredging vessel 33 and guiding the lifting of the dredging vessel 33. If such a frame 34F is provided, the dredging vessel 33 can be lifted and lowered stably. Further, when the dredging vessel 33 has the crushing device 43g, the weight of the dredging vessel 33 increases, but even in that case, the dredging vessel 33 can be held stably.

[0054] Moreover, it is desirable to adopt devices that operate electrically for each device constituting the dredging equipment 32. With such a configuration, if a solar power generation device is provided on the floating body 31, the power source can be supplied from the solar power generation device, so that the renovation of the river R can be realized in an energy-saving manner.

[0055] <Regarding the installation of the weir 3> Since the river R flows with a height difference between the upstream and the downstream, when a horizontal installation bottom SB is formed at a fixed distance and a pair of revetment walls 2, 2 are formed thereon, the relative height between the revetment box 10 and the water W level of the low water channel LR changes between the upstream side and the downstream side. For example, in a river with a gradient of 0.1%, a height difference of 1 m occurs in 1 km, so there is a possibility that the pair of revetment walls 2, 2 cannot exhibit a sufficient revetment function on the upstream side.

[0056] Therefore, a weir structure 3 may be installed so as to connect between the pair of revetment walls 2, 2. Specifically, a structure similar to the revetment box 10 used for the pair of revetment walls 2, 2 may be arranged between the pair of revetment walls 2, 2 to form the weir structure 3. Hereinafter, the revetment box forming the weir structure 3 is referred to as a weir box 20.

[0057] The weir box 20 has a structure similar to that of the revetment box 10 and is a rectangular parallelepiped having a hollow space inside. For example, it is formed by connecting metal iron plates such as stainless steel by welding or the like. The weir box 20 is formed, for example, by connecting stainless steel plates with a thickness of 2 to 3 mm to have a height of 3 to 8 m (preferably 5 to 6 m), a depth of 2 to 5 m (preferably 3 to 5 m), and a width of 2 to 6 m (preferably 5 to 6 m) with respect to the height.

[0058] This weir box 20 is also formed by closing the opening 21a of the bottomed rectangular tube-shaped main body 21 having an opening at the upper end with a lid member 22, similar to the revetment box 10. Specifically, after the earth and sand are put into the hollow space 21h through the opening 21a, the weir box 20 is formed by attaching the lid member 22 to the opening 21h of the main body 21 by means such as welding (see Fig. 4(C)). That is, the weir box 20 is also completed after being installed between the pair of revetment walls 2, 2.

[0059] In addition, an installation surface EB is formed at the place where the weir box 20 is installed so as to connect between the pair of revetment walls 2, 2 (see Fig. 4(A)).

[0060] Then, the weir box 20 forming the weir structure 3 and the revetment box 10 adjacent to the weir structure 3 in the pair of revetment walls 2, 2 are connected by means such as welding so that no gap is formed between them.

[0061] <Regarding the installation method of the weir structure 3> The weir structure 3 as described above can be formed in the same manner as the pair of revetment walls 2, 2. Although the pair of revetment walls 2, 2 can be installed even with water W flowing in the river R, when forming the weir structure 3, the work is carried out after damming the water W upstream of the installation location.

[0062] First, an installation surface EB is formed in the area where the weir box 20 is to be installed. When the installation surface EB is formed, the main bodies 21 of the weir boxes 20 are arranged and installed over the entire area where the installation surface EB is provided. At this time, the main bodies 21 of the weir boxes 20 are arranged and installed so that their openings 21a face upward (see Fig. 4(C)). Then, all of the plurality of weir boxes 20 or some of the plurality of weir boxes 20 are fixed to the installation surface EB with piles or the like.

[0063] When the weir box 20 is fixed to the installation surface EB, the main body parts 21 of the adjacent weir boxes 20 are connected by methods such as welding or bolt connection to form a row of weir boxes. When the row of weir boxes is formed, the dredging device 30 dredges the sediment on the bottom floor LB of the low water channel LR and / or the sandbar SD. Then, the dredged sediment is put into the space 21h of the main body parts 21 of the plurality of weir boxes 20 by the dredging device 30.

[0064] When sediment is put into the space 21h of the main body parts 21 of all the weir boxes 20 forming the row of weir boxes, the lid member 22 is arranged at the opening 21a of the main body part 21, the lid member 22 and the main body part 21 are connected, and the space 21h of the main body part 21 is sealed by the lid member 22. Then, when all the weir boxes 20 are sealed by the lid member 22, the weir structure 3 is completed.

[0065] <Regarding the fixation of the weir box 20> Among the plurality of weir boxes 20, the adjacent weir boxes 20 are connected by methods such as welding or bolting, but the method of connecting the adjacent weir boxes 20 is not particularly limited.

[0066] <Regarding the shape of the weir box 20> The size of the weir box 20 is not limited to the above-mentioned size. The size of the weir box 20 may be formed to an appropriate size according to the size and shape of the river R in which the weir structure 3 is formed by the weir box 20.

[0067] Also, the shape of the weir box 20 is not limited to the above-mentioned shape. The cross-section of the weir box 20 may be, for example, a polygon such as a triangle or a pentagon, but like the revetment box 10, it is desirable that the side surface is flat.

[0068] Also, the weir boxes 20 forming the weir structure 3 do not have to be all of the same size and the same shape. Weir boxes 20 of different shapes and sizes may be appropriately used according to the shape required for the weir structure 3 to be formed.

[0069] <Regarding the weir structure 3> Various facilities may be provided in the weir structure 3. For example, a water channel for passing water W from upstream to downstream may be provided in a part of the weir structure 3. When such a water channel is provided, a fishway through which fish can pass may be provided in the water channel. Further, if a large drop is provided in the water channel before and after the weir structure 3, power generation can be performed by installing a hydroelectric power generation device in the water channel.

[0070] <Regarding the position where the weir structure 3 is installed> The position where the weir structure 3 is installed is not particularly limited. However, when installing a hydroelectric power generation device as described above, it is preferably installed at a position where the height difference of the bottom floor LB of the low water channel LR is at least 1 m between adjacent weir structures 3. Specifically, it is desirable to install the weir structure 3 so that the riverbed gradient I between adjacent weir structures 3 is greater than I = 1 / 100.

[0071] <Regarding the river structure 100> As shown in FIGS. 7 and 8, if a river structure 100 as described below is formed in a river R where a bank protection structure 1 having a pair of bank protection walls 2, 2 formed by a plurality of bank protection boxes 10 is installed, it becomes possible to supply necessary purified water and power during a disaster.

[0072] <Main body structure 101> As shown in FIG. 9, the river structure 100 has a main body structure 101 having a base structure 102 and an equipment structure 110. This main body structure 101 is provided so as to connect between a pair of levees B, B (see FIGS. 7 and 8). Further, the main body structure 101 is provided so that a pair of bank protection walls 2, 2 are located on the upstream side and the downstream side in the flowing direction of the river R. That is, the main body structure 101 is installed so as to be sandwiched between a pair of bank protection walls 2, 2 in the flowing direction of the river R.

[0073] <Base structure 102> As shown in FIG. 9, the base structure 102 of the main body structure 101 is provided to support the equipment structure 110. This base structure 102 is a structure, for example, a concrete foundation provided in the river R, and its upper surface, that is, the floor surface 102b, is formed to be substantially horizontal or substantially parallel to the gradient of the river R. The floor surface 102b of this base structure 102 is formed to be approximately the same height as the maximum liquid level height at which water normally flows between the pair of revetment walls 2, 2. That is, in a state where water of a normal water volume is flowing between the pair of revetment walls 2, 2, the base structure 102 is provided so that the water in the waterway between the pair of revetment walls 2, 2 is blocked by the base structure 102.

[0074] Note that the base structure 102 only needs to be able to stably support the equipment structure 110, and is not limited to being made of concrete, and may be formed of steel or the like.

[0075] <Equipment structure 110> As shown in FIG. 9, the equipment structure 110 is installed above this base structure 102. Specifically, the equipment structure 110 is installed so that a flow path space 101h is formed between the lower surface 110b of the equipment structure 110 and the floor surface 102b of the base structure 102. For example, the height of the lower surface 110b of the equipment structure 110 is set to be slightly higher than the planned high water level of the river R, but the height of the lower surface 110b of the equipment structure 110 only needs to be slightly higher than the planned high water level and is not particularly limited. This equipment structure 110 is supported by a plurality of columns 103 erected on the base structure 102. The plurality of columns 103 are formed of, for example, reinforced concrete or steel. Note that the structure of the plurality of columns 103 is not particularly limited as long as it has the strength to stably support the equipment structure 110 even when the maximum amount of water is stored inside the equipment structure 110 as described later.

[0076] As shown in FIG. 8, the equipment structure 110 is a structure having a hollow space 110h inside. Specifically, the equipment structure 110 has a structure capable of storing water inside. That is, when water is stored in the hollow space 110h of the equipment structure 110, it has a structure that prevents the water from leaking. The hollow space 110h of this equipment structure 110 is liquid-tightly divided by partition walls 110c and 110d into a water receiving tank 111, an equipment installation space 112, and a drainage tank 113 from the upstream side.

[0077] <Water receiving tank 111> The water receiving tank 111 is a space for storing the water supplied from a supply unit 130 described later. The water receiving tank 111 is communicated with the pumping pump 135 of the supply unit 130 by a pipe 135p, and the water in the storage tank 105 is supplied by the pumping pump 135 of the supply unit 130.

[0078] <Equipment installation space 112> The equipment installation space 112 is a space where a purification facility 115 for purifying the water in the water receiving tank 111 and supplying it to the drainage tank 113 is provided. The purification facility 115 is communicated with the water receiving tank 111 by a pipe or the like with one end communicated with the water receiving tank 111 and the other end communicated with the water inlet of the purification facility 115, etc., and is communicated with the drainage tank 113 by a pipe or the like with one end communicated with the discharge port of the purification facility 115, etc., and the other end communicated with the drainage tank 113.

[0079] Note that the purification facility 115 installed in the equipment installation space 112 is not particularly limited. For example, a water purification facility such as CPCM2 manufactured by Meta Water Co., Ltd. can be used as the purification facility 115. Also, the number of purification facilities 115 to be installed is not particularly limited, and the necessary number may be provided according to the amount of water to be treated.

[0080] <Drainage tank 113> The drainage tank 113 is a space where purified water purified by the purification equipment 115 is supplied. The upstream end of the drop flow path 140 communicates with this drainage tank 113, and the water in the drainage tank 113 can be dropped downstream of the main body structure 101 through this drop flow path 140. A generator 145 is provided in this drop flow path 140. That is, it has a function of generating electricity by passing the water in the drainage tank 113 through the drop flow path 140. Note that the water that has passed through the generator 145 can be supplied to various facilities such as homes and factories through pipes and the like that are communicated with the drop flow path 140.

[0081] Note that the generator 145 installed in the drop flow path 140 is not particularly limited. For example, an underwater turbine generator manufactured by Imul Industry Co., Ltd. can be used as the generator 145.

[0082] <Supply section 130> As shown in FIGS. 7 to 9, a storage tank 105 formed by excavating the bottom floor LB of the low water channel LR is provided on the upstream side of the equipment structure 110. This storage tank 105 is a space formed such that its inner bottom surface 105b is lower than the bottom floor LB of the low water channel LR on the upstream side of the storage tank 105. A plurality of pumping pumps 135 are provided in the space inside this storage tank 105. As described above, one end of a pipe 135p communicates with the drainage port of the pumping pump 135, and the other end of the pipe 135p communicates with the water receiving tank 111. Therefore, by operating the pumping pump 135, the water in the storage tank 105 of the storage tank 105 can be supplied to the water receiving tank 111.

[0083] Note that the pumping pump 135 is not particularly limited as long as it can supply the water in the storage tank 105 of the storage tank 105 to the water receiving tank 111. For example, a centrifugal pump (model: FBW-500-2, etc.) manufactured by Naniwa Pump Manufacturing Co., Ltd. can be used as the pumping pump 135.

[0084] <Solar power generation equipment 116> As shown in FIG. 7, the facility structure 110 is provided with a ceiling member 110c so as to cover the above-described hollow space 110h, and a solar power generation panel 116p of the solar power generation facility 116 is provided on the upper surface of the ceiling member 110c. The solar power generation facility 116 includes a capacitor 116b that stores the electric power generated by the solar power generation panel 116p, and a controller 116c that supplies the generated electric power to the capacitor 116b for storage or supplies it to other devices (such as the purification facility 115 and the pumping pump 135) (see FIG. 8).

[0085] Note that the controller 116c may have not only a function of controlling the supply of the electric power generated by the solar power generation facility 116, but also a function of controlling the supply of the electric power generated by the generator 145. Of course, the controller that controls the supply of the electric power generated by the generator 145 may be provided separately from the controller 116c, and the capacitor that stores the electric power generated by the generator 145 may also be provided separately from the capacitor 116b.

[0086] By providing the river structure 100 as described above, the water of the river R can be purified into drinking water, so that the drinking water required in the event of a disaster can be obtained from the river R.

[0087] In addition, it is also possible to supply power during a disaster by the solar power generation facility 116 and the generator 145.

[0088] Furthermore, if the water volume of the river R is between the maximum liquid level height at which water normally flows between the pair of revetment walls 2 and 2 and the limit liquid level, even if the water volume of the river R increases, water can flow through the space (flow path space 101h) between the lower surface 110b of the facility structure 110 and the floor surface 102b of the base structure 102. Then, even if the river R floods and the water volume exceeds the processing capacity of the plurality of pumping pumps 135, the water purification and power generation in the river structure 100 can be maintained without damaging the river structure 100.

[0089] <Regarding the main body structure 101> The size of the main body structure 101 is not particularly limited, and it may be formed in an appropriate size according to the size of the river R. For example, if the river R between the levees B has a width of 100 m, the main body structure 101 can be formed to have a width (the vertical length in FIGS. 7 and 8) of 100 m and a length along the flow direction D of the river R of 200 m in plan view. Also, the height of the hollow space 110h of the equipment structure 110 is not particularly limited, and it may be set to a depth that can store an appropriate amount of water. The height of the hollow space 110h of the equipment structure 110 can be, for example, 5 to 6 m.

[0090] The pair of revetment walls 2, 2 do not necessarily have to be provided on the upstream side and the downstream side of the main body structure 101. They may be provided only on the upstream side of the main body structure 101. However, if they are provided on the downstream side of the main body structure 101, it becomes easier to provide a drop when discharging water to the downstream side, and it becomes easier to generate electricity.

[0091] Also, as described above, if the equipment structure 110 is provided with the ceiling member 110c so as to cover the hollow space 110h, various devices can be provided on the upper surface of the ceiling member 110c, not limited to the solar power generation panel 116p. However, if devices such as the purification equipment 115 are not provided in the equipment installation space 112, the ceiling member 110c does not necessarily have to be provided.

[0092] Also, the water in the water receiving tank 111 does not necessarily have to be supplied to the drain tank 113 through the purification equipment 115 etc. in the equipment installation space 112. For example, if the water in the water receiving tank 111 is not purified, the water in the water receiving tank 111 may be directly supplied from the water receiving tank 111 to the drain tank 113. For example, a bypass flow path or the like connecting the water receiving tank 111 and the drain tank 113 may be provided to directly supply from the water receiving tank 111 to the drain tank 113.

[0093] When the purification equipment 115 is provided, the purified water may be directly supplied to the outside without being supplied to the drain tank 113. In this case, it is desirable to provide a bypass flow path or the like for a part of the water in the water receiving tank 111 to directly supply from the water receiving tank 111 to the drain tank 113.

[0094] <Regarding the supply section 130> The number of pumping pumps 135 provided is not particularly limited, and an appropriate number may be provided according to the capacity of the water receiving tank 111 or the like. One may be provided, or a plurality may be provided. Further, when a plurality of pumping pumps 135 are provided, a storage tank 105 corresponding to each pumping pump 135 may be provided respectively, or a plurality of storage tanks 105 in which a plurality of pumping pumps 135 are arranged may be provided, or all the pumping pumps 135 may be arranged in one storage tank 105. If a plurality of storage tanks 105 are provided,

[0095] Further, the supply section 130 does not necessarily have to be provided. However, if the supply section 130 is provided, the water inlet of the pumping pump 135 can be surely arranged underwater. That is, even if the water level of the river R drops, it is easy to prevent the water inlet of the pumping pump 135 from being exposed.

[0096] Further, the size of the storage tank 105 is not particularly limited, and it may be formed in an appropriate size according to the size of the river R. For a river R with a width of 100 m between the levees B, the main body structure 101 can be formed, for example, in a size with a width (the length in the vertical direction in FIGS. 7 and 8) of 50 m and a length along the flow path direction D of the river R of 30 m in plan view. Further, the depth of the storage tank 105 is not particularly limited, and it may be set to a depth capable of storing an appropriate amount of water. The height difference between the bottom floor LB of the low water channel LR and the inner bottom surface 105b of the storage tank 105 can be, for example, 4 to 8 m.

[0097] Also, if the head of the supply section 130, that is, the difference in height between the bottom floor LB of the low water channel LR on the upstream side of the storage tank 105 and the inner bottom surface 105b of the storage tank 105 is increased to a certain extent (for example, about 8 m), it becomes possible to utilize the water flow flowing into the storage tank 105 for power generation. For example, if a pipe communicating between the bottom floor LB of the low water channel LR on the upstream side of the storage tank 105 and the inner bottom surface 105b of the storage tank 105 is provided at the upstream end of the storage tank 105 and a generator is provided in this pipe, it becomes possible to utilize the water flow flowing into the storage tank 105 for power generation. The generator used in this case is not particularly limited, and the same generator as the above-described generator 145 can be used.

[0098] In particular, when a generator is provided in the storage tank 105, a wall surface 105w extending above the bottom floor LB of the low water channel LR and a ceiling wall 105c covering the space surrounded by the wall surface 105w may be provided in the storage tank 105, and a pipe 105p penetrating the wall surface 105w may be provided in the space surrounded by the wall surface 105w and the ceiling wall 105c, and water may be supplied through this pipe 105p (FIGS. 10 and 11). In FIG. 10, the drawing is shown excluding the ceiling wall 105c for easy understanding of the structure. In this case, if a generator 146 is provided in the pipe 105p, it becomes possible to perform power generation using the difference in height between the bottom floor LB of the low water channel LR and the inner bottom surface 105b of the storage tank 105.

[0099] <Regarding the falling flow path 140 and the generator 145> A plurality of falling flow paths 140 may be provided, or they may be provided at one location. An appropriate number may be provided according to the capacity of the drainage tank 113 and the power generation amount of the generator 145. Also, when a plurality of falling flow paths 140 are provided, an electromagnetic valve or the like may be provided in the falling flow path 140 to adjust the falling flow path 140 through which water flows. That is, water may be allowed to flow through all the falling flow paths 140, or water may be allowed to flow through some of the falling flow paths 140. Appropriate adjustment may be made according to the situation of the river R and the state of the water in the drainage tank 113. Also, generators 145 may be provided in all the falling flow paths 140, or generators 145 may be provided only in some of the falling flow paths 140.

[0100] Also, as shown in FIGS. 9 and 11, an enclosure having side walls 140b and a ceiling wall 140c may be provided so as to surround the falling channel 140 and the generator 145 (note that in FIGS. 7, 8, and 10, the drawings are shown excluding the ceiling wall 140c for clarity of the structure). That is, the falling channel 140 and the generator 145 may be disposed in a space surrounded by the side walls 140b and the ceiling wall 140c. Note that the lower end of the side wall 140b may be provided so that there is a sufficient gap for water or the like discharged from the falling channel 140 to flow downstream between the lower end of the side wall 140b and the bottom floor LB of the low water channel LR. For example, the lower end of the side wall 140b may be provided to be slightly below the water surface in a state where water is flowing at the normal water level in the low water channel LR.

[0101] Furthermore, when a plurality of falling channels 140 and generators 145 are provided, enclosures having side walls 140b and a ceiling wall 140c may be provided for each of the falling channels 140 and generators 145, or an enclosure having side walls 140b and a ceiling wall 140c for accommodating all of the falling channels 140 and generators 145 may be provided, or a plurality of enclosures having side walls 140b and a ceiling wall 140c for accommodating some of the falling channels 140 and generators 145 (for example, two falling channels 140 and generators 145) may be provided.

[0102] <River structure of another embodiment> When a generator is provided in the river structure, the following configuration may be adopted. As shown in FIGS. 12 and 13, the river structure 200 includes power generation blocks 201A to 201C extending along the flow direction of the river, and the power generation blocks 201A to 201C are provided side by side between a pair of levees B and B. That is, a plurality of power generation blocks 201A to 201C are arranged side by side in a direction intersecting the flow direction of the river.

[0103] In FIGS. 12 and 13, the case where three power generation blocks 201A to 201C are provided is shown, but the number of power generation blocks 201 provided is not particularly limited. An appropriate number may be provided according to the width of the river, the flow rate of the water flowing in the river, etc. Since the power generation blocks 201A to 201C have substantially the same structure, the power generation block 201A will be described below. Also, in FIG. 12, for the sake of clarity of the configuration, some of the devices constituting the power generation blocks 201A to 201C are shown by symbols, etc., and the flow of water is shown by white arrows.

[0104] <Power generation block 201A> The power generation block 201A includes a main body 202 having a hollow space 202h inside where a power generation device 210 is installed, and water storage parts 201a and 201b provided on the upstream side and the downstream side of the main body 202, respectively.

[0105] Note that the main body 202 of the power generation block 201A has a structure in which the upper part is closed by a ceiling (not shown). A solar power generation panel is installed on this ceiling, and the space above the ceiling is also effectively utilized for power generation.

[0106] <Water storage parts 201a, 201b> As shown in FIGS. 12 and 13, a storage wall Wa is provided on the upstream side of the upstream side wall 202a of the main body 202, and a water storage part 201a is provided between the upstream side of the upstream side wall 202a and the storage wall Wa. This water storage part 201a is divided into a first water storage part A and a second water storage part B by a separation wall Wd provided between the upstream side wall 202a and the storage wall Wa. Note that the storage wall Wa is provided with a through hole (not shown) or the like so that the water upstream of the storage wall Wa flows in and the inside of the first water storage part A can maintain a certain water level. Also, the separation wall Wd is also provided with a through hole (not shown) or the like so that water flows from the first water storage part A to the second water storage part B and the inside of the second water storage part B can maintain a certain water level.

[0107] Also, as shown in FIGS. 12 and 13, a storage wall Wb is provided on the downstream side of the downstream side wall 202b of the main body 202, and a water storage portion 201b is provided between the upstream side of the downstream side wall 202b and the storage wall Wb. This water storage portion 201b is divided into a third water storage portion C and a fourth water storage portion D by a separation wall Wd provided between the downstream side wall 202b and a storage wall Wa. Note that the storage wall Wb is provided with through holes (not shown) or the like so that water can flow out to the downstream side of the storage wall Wb and the inside of the fourth water storage portion D can maintain a certain water level. Also, the separation wall Wd is also provided with through holes (not shown) or the like so that the water in the third water storage portion C can flow into the fourth water storage portion D and the inside of the third water storage portion C can maintain a certain water level.

[0108] <Communication pipes 251, 261> Communication pipes 251 and 261 are provided between the first water storage portion A and the fourth water storage portion D described above, and are configured to allow water to flow between the two. Specifically, one end of the communication pipe 251 is immersed in the water in the first water storage portion A, and the other end is disposed in the fourth water storage portion D. A pump 251p is provided at one end of this communication pipe 251 (see FIG. 13), and by operating this pump 251p, water can be pumped from the first water storage portion A to the fourth water storage portion D through the communication pipe 251. On the other hand, one end of the communication pipe 261 is immersed in the water in the fourth water storage portion D, and the other end is disposed in the first water storage portion A. A pump 261p is provided at one end of this communication pipe 261, and by operating this pump 261p, water can be pumped from the fourth water storage portion D to the first water storage portion A through the communication pipe 261. That is, by operating the pump 251p and the pump 261p, water can be circulated between the first water storage portion A and the fourth water storage portion D through the communication pipes 251 and 261.

[0109] Note that the communication pipes 251 and 261 are provided with emergency water supply parts 251e and 261e capable of supplying water to the power generation device 210 described later in the middle of their paths. For example, valves that are normally closed but open in an emergency to supply water to the power generation device 210 (specifically, the pipe 205 that sends liquid to the power generation device 210) are provided as the emergency water supply parts 251e and 261e. By providing such emergency water supply parts 251e and 261e, even if a failure occurs in some of the power generation devices 210 or the pipe 205 becomes clogged, water can be supplied to the power generation devices 210 downstream of the location where these troubles occur, and power generation can be continued.

[0110] <Main body 202> As shown in FIGS. 12 and 13, the main body 202 is a box-shaped structure having a hollow space 202h inside, and a plurality of power generation devices 210 are provided inside, and power generation using the water flow can be performed by these plurality of power generation devices 210.

[0111] As shown in FIGS. 12 and 13, the inside of the hollow space 202h of the main body 202 is divided into a plurality of accommodation compartments 203h by a plurality of partition walls 203. Specifically, the space 202h is divided into a forward flow path space 203x and a reverse flow path space 203y by a vertical partition wall (a partition wall provided at a position where it cannot be seen overlapping the communication pipes 251 and 261 in FIG. 12) extending along the flow path direction of the river. The forward flow path space 203x is a space for flowing water in the same direction as the flow of water in the river, and the reverse flow path space 203y is a space for flowing water in the opposite direction to the flow of water in the river. In addition, a plurality of separation partition walls 203d are provided at predetermined intervals (for example, at intervals of 4 m) in the forward flow path space 203x and the reverse flow path space 203y. That is, a plurality of separation partition walls 203d are provided so that a plurality of accommodation compartments 203h, which are mutually divided spaces, are formed along the flow path direction of the river.

[0112] A plurality of these storage compartments 203h are provided with a pipe 205 for flowing water so as to connect adjacent storage compartments 203h. Specifically, as shown in FIG. 13, in the storage compartment 203h of the downstream channel space 203x, the upstream end of the pipe 205 (the upstream side in the river path, the same hereinafter) crosses the upstream partition wall 203d and is disposed in the adjacent upstream storage compartment 203h such that its opening faces downward. On the other hand, the downstream end of the pipe 205 (the downstream side in the river path, the same hereinafter) is disposed near the downstream partition wall 203d and is arranged such that its opening faces upward. Further, the pipe 205 has a straight portion 205s that is continuous with the upstream end and extends vertically on the upstream side of the storage compartment 203h. Between the lower end of the straight portion 205s and the downstream end, there are a horizontal portion 205f extending along the bottom surface of the storage compartment 203h and a straight portion 205g that is continuous with the horizontal portion 205f and extends vertically. That is, within the storage compartment 203h, the pipe 205 is formed in a substantially U shape by the straight portion 205s, the horizontal portion 205f, and the straight portion 205g. And the upstream end of the pipe 205 is inserted into the opening of the downstream end of the pipe 205 in the upstream storage compartment 203h. Moreover, the pipe 205 is installed such that the upstream end is immersed in the water in the pipe 205 of the upstream storage compartment 203h. Among the storage compartments 203h, the pipe 205 of the storage compartment 203h adjacent to the second water storage portion B is provided such that its upstream end crosses the upstream side wall 202a and is immersed in the water in the second water storage portion B. Also, among the storage compartments 203h, the pipe 205 of the storage compartment 203h adjacent to the third water storage portion C is provided with a pump 207 on its straight portion 205g and has a pipe that can supply water from the straight portion 205g, cross the downstream side wall 202b continuously, and supply water to the second water storage portion C.

[0113] On one hand, in the accommodation section 203h of the countercurrent path space 203y, a pipe 206 having substantially the same structure as the pipe 205 is provided except for the difference in arrangement due to the difference in the flowing direction of water. That is, the downstream end of the pipe 206 is arranged so that its opening faces downward in the adjacent upstream accommodation section 203h over the downstream separation partition 203d. On the other hand, the upstream end of the pipe 206 is arranged near the upstream separation partition 203d and is arranged so that its opening faces upward. Further, the pipe 206 has a straight portion 206s that is continuous with the downstream end and extends vertically on the downstream side of the accommodation section 203h. Also, between the lower end of the straight portion 206s and the upstream end, there are a horizontal portion 206f extending along the bottom surface of the accommodation section 203h and a straight portion 206g that is continuous with the horizontal portion 206f and extends vertically. That is, in the accommodation section 203h, the pipe 206 is formed in a substantially U shape by the straight portion 206s, the horizontal portion 206f, and the straight portion 206g. And the downstream end of the pipe 206 is inserted into the opening of the upstream end of the pipe 206 in the downstream accommodation section 203h. Moreover, the pipe 205 is installed so that the downstream end is immersed in the water in the pipe 205 in the downstream accommodation section 203h. Note that, among the accommodation sections 203h, the pipe 206 of the accommodation section 203h adjacent to the third water storage section C is provided so that its upstream end crosses the downstream side wall 202b and is immersed in the water in the third water storage section C. Also, among the accommodation sections 203h, the pipe 206 of the accommodation section 203h adjacent to the second water storage section B has a pump 207 provided in its straight portion 206g and has a pipe that can supply water from the straight portion 206g to cross the upstream side wall 202b and supply water to the second water storage section B.

[0114] Note that the above-described emergency water supply section 251e is provided to communicate the communication pipe 251 and the pipe 205 at a position downstream of the upstream separation partition 203d in the pipe 205. Also, the above-described emergency water supply section 252e is provided to communicate the communication pipe 252 and the pipe 206 at a position upstream of the downstream separation partition 203d in the pipe 206.

[0115] And, a power generation device 210 is provided in the straight portions 205s and 206s of the pipes 205 and 206 in each accommodation section 203h. This power generation device 210 is installed so that power can be generated by the water flow when flowing from the straight portions 205s and 206s from above downward.

[0116] With the configuration as described above, in the accommodation section 203h, if the pump 207 provided in the straight portion 205g of the pipe 205 in the accommodation section 203h adjacent to the third water storage section C and the pump 207 provided in the straight portion 206g of the pipe 206 in the accommodation section 203h adjacent to the second water storage section B are operated, water can be flowed in the order of the second water storage section B → a plurality of pipes 205 → the third water storage section C → a plurality of pipes 206 → the second water storage section B. That is, water can be circulated between the second water storage section B and the third water storage section C. Then, power can be generated by the power generation device 110 provided in each pipe 205 of each accommodation section 203h. Moreover, if the two pumps 207 are operated, not only the capacity of each pump 207 but also the siphon effect due to the layout of the pipes 205 and 206 can be expected.

[0117] Note that the river structure 200 shown in FIGS. 12 and 13 may have a structure installed in a state fixed to the river, or may have a float structure floating on the water of the river. If the river structure 200 has a float structure, the river structure 200 can be easily moved to a desired position along the river, so it becomes possible to supply power to a house, a company, etc. at a desired place. Further, since it floats in accordance with the water level even when a rise in the water level of the river occurs, etc., it is possible to prevent problems such as damage caused by a rise in the water level and inability to generate power.

Industrial Applicability

[0118] The river structure of the present invention is suitable as a facility for generating power in a river.

Explanation of Signs

[0119] 1 Retaining structure 2 Retaining wall 3 Weir structure 10 Revetment Box 11 Body part 11a Opening 11h Space 12 Cover member 20 Weir Box 21 Body part 21a Opening 21h Space 22 Cover member 30 Dredging device 31 Floating body 31h Opening 32 Dredging equipment 33 Dredging container 33a Opening 33b Ceiling wall 33h Through hole 33c Side wall 34 Lifting device 35 Suction device 36 Pipe 37 Pipe 40 Dredging equipment 41 Container 100 River structure 101 Main body structure 101h Space 102 Base structure 105 Storage tank 105b Inner bottom surface 110 Equipment structure 111 Water receiving tank 112 Equipment installation space 113 Drainage tank 115 Purification equipment 116 Solar power generation equipment 130 Supply section 135 Water pump 140 Falling flow path 145 Generator 200 River structure 201 Power generation block 201a Water storage section 201b Water storage section 202a Upstream side wall 202b Downstream side wall 202h Space 203h Storage compartment 203x downstream channel space 203y upstream channel space 203d separation partition wall 205 pipe 205s straight section 205f horizontal section 205g straight section 206 pipe 206s straight section 206f horizontal section 206g straight section 207 pump 210 power generation device 251 connecting pipe 251e emergency water supply section 251p pump 261 connecting pipe 261e emergency water supply section 261p pump A first water storage section B second water storage section C third water storage section D fourth water storage section Wa retaining wall Wb retaining wall R river LR low water channel LB bottom bed LB HR high water area B levee SD mid-channel SB installation base W water

Claims

1. A main body having a hollow space where a power generation device is provided, and a storage part provided in front of and behind the main body, in the hollow space of the main body, a flow path space extending in the front-rear direction of the main body is provided, the flow path space is provided with a plurality of accommodation compartments divided by a plurality of partition walls provided at intervals along the extending direction thereof, inside the accommodation compartments a pipe and a power generation device that generates power by water flowing in the pipe are provided, the pipe is provided such that water flows between the storage parts provided in front of and behind the main body by connecting the pipes in each accommodation compartment, between adjacent accommodation compartments has a structure in which water flows from one accommodation compartment to another by the siphon effect A river structure characterized by this.

2. The flow path space a downstream flow path space in which water flows from the storage part provided in front of the main body to the storage part provided behind the main body by the siphon effect, and a countercurrent flow path space provided in parallel with the downstream flow path space and in which water flows from the storage part provided behind the main body to the storage part provided in front of the main body by the siphon effect are provided. The river structure according to claim 1, characterized by this.

3. The storage part an adjacent storage part adjacent to the main body, and a remote storage part provided outside the adjacent storage part, a downstream flow path pipe provided in parallel with the downstream flow path space and flowing water from the remote storage part located in front of the main body to the remote storage part located behind the main body, a countercurrent pipe provided in parallel with the countercurrent flow path space and flowing water from the remote storage part located behind the main body to the remote storage part located in front of the main body, in the downstream flow path pipe an emergency water supply part that blocks communication with the pipe provided in the downstream flow path space is provided, in the countercurrent pipe an emergency water supply part that blocks communication with the pipe provided in the countercurrent flow path space is provided. The river structure according to claim 2, characterized by this.

4. The main body has a float structure that can float on the water of the river. The river structure according to claim 1, characterized by this.

5. A structure provided between a river and a levee, a base structure having a floor surface at a predetermined limit liquid level height, and a facility structure provided at an interval above the base structure and having a hollow space inside. A storage tank provided on the bottom of the lower watercourse of the river upstream of the base structure for storing river water; A supply section for supplying the water in the storage tank to the hollow space of the equipment structure; A falling flow path provided downstream of the equipment structure for dropping the water in the hollow space of the equipment structure into the river; A generator provided in the falling flow path, and The storage tank has an inner bottom located below the bottom of the lower watercourse of the river. A river structure characterized by this.

6. The hollow space of the equipment structure includes a water receiving tank for storing the water supplied from the supply section, a drainage tank for storing the water drained to the falling flow path, and a water purification facility provided between the water receiving tank and the drainage tank. The river structure according to claim 5, characterized by this.

7. A flow path space for flowing river water is provided between the base structure and the equipment structure. The river structure according to claim 5 or 6, characterized by this.

8. The equipment structure is provided with a ceiling member covering the hollow space, and a solar power generation panel is provided on the ceiling member. The river structure according to claim 5 or 6, characterized by this.

9. Upstream of the base structure at the boundary between the lower watercourse and the high bank in the river, a pair of revetment structures formed by a plurality of revetment boxes arranged along the direction of the river flow on a flat installation bottom formed by excavating the boundary along the direction of the river flow are provided, and each revetment box has dredged sediment from the bottom of the lower watercourse and the sediment of the midstream island enclosed inside a hollow box-shaped body. The river structure according to claim 5 or 6, characterized by this.

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