Water intake device

Abstract

A water intake device that can improve water intake efficiency while simplifying the configuration and reducing weight is provided. [Solution] The system includes a water intake movable weir 3 that is interposed in a waterway 2 and can move up and down. When the water intake movable weir 3 is lowered and placed on the waterway bottom 9 in a damming state, the lower end surface 6 of the water intake movable weir 3 covers the upper end portion 10a of a water collection recess 10 recessed in the waterway bottom 9. The water intake movable weir 3 allows the waterway water that has overflowed its upper end to flow down through an inclined water intake screen 5, and some of the water is filtered and taken in. The taken water flows into the water collection recess 10 from a lower end open portion 7 provided on the lower end surface 6 of the water intake movable weir 3.

Description

[Technical field]

[0001] The present invention relates to a water intake device, more specifically, to a water intake device that is provided with a movable water intake weir that is disposed in a waterway such as a river and can move up and down, and that is configured to take in water by damming up the waterway water when the movable water intake weir is in a lowered position. [Background technology]

[0002] Patent Document 1 discloses an example of a water intake device configured to take in water by damming up water from a waterway such as a river. In this device, a water intake device is provided integrally with a movable weir that is disposed in a waterway, such as a river, and is movable up and down, on the downstream surface of the waterway, and the water intake device is movable up and down integrally with the movable weir. The water intake device is provided with a water intake screen that allows water that has overflowed the upper end of the movable weir to flow down and filters a portion of the flowing water so that it can be taken in at its lower surface, and the bottom side of the water intake device is a water intake tank. The vertical length of the water intake tank is usually about 30 to 40 cm.

[0003] When the movable weir completely closes the waterway, the bottom of the intake tank abuts against the bottom of the waterway. Water that falls below the water intake screen is collected in the intake tank, the bottom of which abuts against the bottom of the waterway (the water depth in the intake tank is usually about 30 to 40 cm), and transported to a specified location via a water supply pipe to be used for snow melting, agricultural water, industrial water, etc.

[0004] When water stored in the intake tank is to be taken only temporarily for the purpose of melting snow, or during periods when water intake is not required, such as summer, the intake device is raised. The intake device is raised together with the movable weir, for example, by a lifting device consisting of a rack drive device.

[0005] The movable weir integrated water intake device having such a configuration has the advantage that it can reliably take in water without being affected by sediments on the upstream side of the movable weir, but it has the following problems.

[0006] (1) In the water intake device disclosed in Patent Document 1, for example, when water is taken in only for a certain period of time for the purpose of snow melting, the movable weir is raised during periods when water intake is not required, such as in summer, and at this time, the water intake device is also raised together with the movable weir. When the water intake device is raised (lifted), the water stored in the water intake tank is also lifted. The water depth in the water intake tank is usually about 30 to 40 cm, and the weight of the water stored is about 300 to 500 kg even for a small water intake device, and can reach 2 to 3 tons when the amount of water lifted is large. For this reason, a large lifting device with a large capacity is required to lift the water intake device, which causes a problem of an increase in the price of the water intake device. In addition, since the amount of water lifted is large, the water intake device must be constructed to be sturdy, which increases the size of each component. For this reason, there is a problem of poor workability, such as the need for a large tow truck when constructing the water intake device.

[0007] (2) As mentioned above, the water intake device allows the channel water that has overflowed the upper end of the movable weir to flow down over the upper surface of the intake screen and filters a portion of the flowing water so that it can be taken from the underside of the intake screen, and the intake screen is arranged so as to slope downward toward the downstream of the waterway.

[0008] As mentioned above, when taking in water, the movable weir closes the waterway, and in this state the bottom of the intake device (the bottom of the intake tank) comes into contact with the bottom of the waterway and water is taken in by the intake screen, but the bottom of the intake screen had to be aligned with the top of the intake tank, so the amount of water taken in by the intake screen was naturally limited to a certain amount by the top of the intake tank.

[0009] Therefore, in order to increase the amount of water intake in the water intake device, it was necessary to increase the extension length of the water intake device in the width direction of the waterway to increase the water intake area, or to increase the height of the movable weir and set the upper end of the water intake screen at a higher position. However, if the extension length of the water intake device is increased, the amount of water contained in the water intake tank increases further, which further increases the load to be lifted, resulting in the problem of requiring a lifting device with even greater capacity. Furthermore, there was a limit to how much height the movable weir could be increased due to restrictions under the River Act. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2003-34923 A Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been developed in consideration of the above-mentioned problems in the conventional art, and has the following objectives in a water intake device that takes in water by damming up water from a waterway. (1) First issue To improve the ease of construction of a water intake device and reduce its cost by reducing the lifting load required when raising a water intake movable weir and by simplifying and lightening the structure of the water intake movable weir. (2) Second issue To improve water intake efficiency by increasing the amount of water intake (amount of water intake per unit time). [Means for solving the problem]

[0012] In order to solve the above problems, the present invention employs the following means. That is, a first aspect of the water intake device of the present invention is a water intake device which comprises a water intake movable weir which is interposed in a waterway and can move up and down, and which takes in water by damming up the water in the waterway when the water intake movable weir is lowered, and the water intake movable weir is provided with a water intake screen which allows the water in the waterway that has overflowed its upper end to flow down and filters some of the flowing water so that it can be taken in at the bottom, and the lower end surface of the water intake movable weir is provided with a lower end opening portion which releases the water taken in by the water intake screen. A water collection recess is recessed into the bottom of the waterway, and when the movable water intake weir is lowered and installed at the bottom of the waterway in a damming state, the lower end surface portion covers the upper end of the water collection recess and the lower end open portion is connected to the water collection recess, and a water collection section is formed between the water collection recess and the lower end surface portion for collecting water taken in by the water intake screen.

[0013] A second aspect of the water intake device according to the present invention is the first aspect, wherein the movable water intake weir has a water intake box-shaped body formed of a metal plate, and has a main body having a horizontal upper plate part protruding horizontally toward the downstream of the waterway at the upper end of an upright plate part and a horizontal lower plate part protruding horizontally toward the downstream of the waterway at the lower end of the upright plate part, and an extended horizontal lower plate part connected horizontally to a tip of the horizontal lower plate part. The horizontal lower plate part and the extended horizontal lower plate part in a connected state constitute the lower end surface part, and the lower end opening part is provided on the extended horizontal lower plate part or across the extended horizontal lower plate part and the horizontal lower plate part. The left and right open ends of the main body are closed with side panels, and the upper and lower ends of the water intake screen, which slopes downward toward the downstream of the waterway and allows the water that has overflowed the upper end of the upright plate to flow down and filter a portion of the flowing water so that it can be taken in at the lower side, are directly or indirectly connected to the tip of the horizontal upper plate and the tip of the extended horizontal lower plate, so that the water taken in by the water intake screen is discharged at the lower end open section. The horizontal upper plate, the upright plate and the horizontal lower plate are formed as a single continuous piece by bending a single metal plate.

[0014] A third aspect of the water intake device according to the present invention is characterized in that, in the first or second aspect, the lower end surface portion has a cover plate portion connected to a downstream end of a lower end surface portion main body having the lower end open portion. When the lower end surface portion covers an upper end of the water collecting recess, the lower end open portion communicates with a part of the water collecting recess that forms the upstream side, and the cover plate portion closes the upper end open portion of the part of the water collecting recess that forms the downstream side, so that a water collecting portion that collects the taken water is formed between the water collecting recess and the lower end surface portion.

[0015] A fourth aspect of the water intake device of the present invention is characterized in that, in the third aspect, when the cover plate portion is viewed in a horizontal position, the upstream end of the cover plate portion on the waterway side is pivotally attached to the downstream end of the lower end surface portion main body so as to be rotatable in a vertical plane.

[0016] A fifth aspect of the water intake device according to the present invention is the first or second aspect, characterized in that a bottom recess recessed in the bottom of the waterway is partitioned in the waterway width direction by a vertically movable lifting partition plate, thereby forming the water collection recess upstream of the lifting partition plate. The lifting partition plate is lowered at the downstream end of the lower end surface part of the movable water intake weir, and the water collection recess is formed by the lifting partition plate partitioning the bottom recess in the waterway width direction as the movable water intake weir descends. The lower end surface part of the movable water intake weir covers the upper end part of the water collection recess, so that the lower end open part communicates with the water collection recess, and the water collection part that collects the water taken in by the water intake screen is formed between the water collection recess and the lower end surface part.

[0017] A sixth aspect of the water intake device according to the present invention is the first or second aspect, in which a bottom recess is provided in the upper bottom of a waterway having a drop, the upper bottom being connected to the lower bottom via a step. The entire downstream end of the bottom recess is open toward the downstream side of the waterway, and the bottom recess is partitioned in the waterway width direction by a lift-up partition plate that can move up and down, thereby forming a water collection recess that is upstream of the closed lift-up partition plate. The lift-up partition plate is disposed at the downstream end of the lower end surface of the movable water intake weir. The lift-up partition plate is lowered in association with the lowering of the movable water intake weir, causing the lift-up partition plate to partition the bottom recess, thereby forming the water collection recess. The device is characterized in that, by the lower end surface portion of the water-intake movable weir covering the upper end portion of the water-collecting recess, the lower end open portion is connected to the water-collecting recess, and a water-collecting portion for collecting the taken water is formed between the water-collecting recess and the lower end surface portion.

[0018] A seventh aspect of the water intake device of the present invention is the fifth aspect, characterized in that the lifting partition plate is pivotally attached to the downstream end of the lower end surface portion so as to be rotatable in a vertical plane.

[0019] An eighth aspect of the water intake device of the present invention is the sixth aspect, characterized in that the lifting partition plate is pivotally attached to the downstream end of the lower end surface portion so as to be rotatable in a vertical plane.

[0020] A ninth aspect of the water intake device according to the present invention is the first or second aspect, in which the water collection recess is provided on the upstream side of a bottom recess recessed into the bottom of the waterway, and the bottom recess extends downstream of the waterway beyond the downstream end of the lower end surface of the movable water intake weir. A tilting weir plate is provided on the downstream side of the bottom recess, and the tilting weir plate has a plate shape extending in the waterway width direction, and is configured so that its lower end can be in abutment with the bottom of the bottom recess and its both side ends can be in abutment with opposing side wall surfaces of the bottom recess. The tilting weir plate is pivotally attached at its lower end to the bottom side of the bottom recess, so that it can be tilted within an angular range between a lying state where it overlaps with the bottom on the downstream side of the waterway and a standing state where it stands at a required angle. The tilting weir plate is held in the raised state, thereby forming the water collection recess on the upstream side of the waterway from the tilting weir plate in the raised state. The lower end surface of the movable water intake weir covers the upper end part of the water collection recess, thereby communicating the lower end open part with the water collection recess, and forming the water collection section for collecting the taken water between the water collection recess and the lower end surface.

[0021] A tenth aspect of the water intake device according to the present invention is, in the first or second aspect, the water collection recess is provided on the upstream side of a bottom recess recessed in an upper-stage bottom of a waterway bottom having a drop, the upper-stage bottom of which is connected to a lower-stage bottom via a step, the bottom recess extends downstream of the waterway beyond the downstream end of the lower end surface of the movable water-intake weir, and the entire downstream end of the bottom recess is open toward the downstream side of the waterway. Also, a tilting weir plate is provided on the downstream side of the bottom recess, and the tilting weir plate has a plate shape extending in the waterway width direction, and its lower end can be in contact with the bottom of the bottom recess and both side ends are in contact with opposing side wall surfaces of the bottom recess. Furthermore, the tilting weir plate is pivotally attached at its lower end to the bottom side of the bottom recess, so that it can be tilted within an angle range between a laid-down state in which it overlaps with the bottom on the downstream side of the waterway, and a raised state in which it rises to a required angle. By maintaining the tilting weir plate in the raised state, the water collecting recess is formed on the upstream side of the waterway from the tilting weir plate in the raised state. And, by covering the lower end surface portion of the water intake movable weir with the upper end portion of the water collecting recess, the lower end open portion communicates with the water collecting recess, and the water collecting portion that collects the taken water is formed between the water collecting recess and the lower end surface portion.

[0022] An eleventh aspect of the water intake device of the present invention is characterized in that, in the first or second aspect, the inner wall surface portion of the water collection recess downstream of the water channel as viewed in the extension direction of the water channel is inclined toward the downstream side of the water channel from its lower end to its upper end. Effect of the Invention

[0023] The water intake device of the present invention adopts a basic configuration in which a water collection section for collecting water taken in by the water intake screen is formed between the water collection recess recessed into the bottom of the waterway and the lower end surface of the water intake movable weir.

[0024] Therefore, according to the present invention, it is possible to reduce the lifting load required to raise the movable intake weir, thereby reducing the capacity of the lifting device, and to simplify and lighten the structure of the movable intake weir, thereby improving the ease of construction of the intake device and reducing its cost. It is also possible to increase the amount of water intake (amount of water intake per unit time) and improve the efficiency of the intake. This will be explained in detail below.

[0025] (1) The water intake device according to the present invention employs a configuration in which a water collection section for collecting water taken in using a water intake screen is formed between the water collection recess recessed into the bottom of the waterway and the lower end surface of the water intake movable weir. Therefore, unlike the water intake device according to Patent Document 1, in which the bottom side of the water intake device that takes in waterway water with a water intake screen is used as a water intake tank to store the taken water, this water intake device does not have to lift a large amount of water at the same time when lifting the water intake movable weir. Therefore, the lifting load of the water intake movable weir can be significantly reduced. For this reason, when the water intake device according to the present invention is used, a lifting device with a large capacity as in the prior art is not required, the lifting device can be made smaller, and the cost of the lifting device can be reduced.

[0026] (2) The movable water-intake weir of the present invention does not need to be equipped with an intake tank, which was essential in the water-intake device of Patent Document 1. Therefore, when using the water-intake device of the present invention, the lower end of the water-intake screen can be extended to a state close to the bottom of the waterway. This makes it possible to increase the amount of water intake (amount of water intake per unit time) and improve water-intake efficiency. The ability to increase the amount of water intake in this way has the advantage that it can be installed in places where it was previously not possible to install a water-intake device due to insufficient water intake.

[0027] (3) In particular, when the water-intake movable weir is configured to have the water-intake box-shaped body, the main body of the water-intake box-shaped body is configured as a channel-shaped body with high rigidity by the horizontal upper plate portion, the upright plate portion, and the horizontal lower plate portion, so that the water-intake movable weir has strength against water pressure. Therefore, the movable intake weir can be constructed simply and light in weight, which contributes to reducing the capacity of the lifting device and also contributes to reducing the cost by reducing the number of steps required to manufacture the intake device. [Brief description of the drawings]

[0028] [Figure 1] 1 is a perspective view illustrating a water intake device according to the present invention when a movable water intake weir is in its lowest and highest positions. FIG. [Diagram 2] FIG. 2 is a plan view illustrating the water intake device according to the present invention. [Diagram 3] FIG. 2 is a perspective view illustrating a movable water intake weir that constitutes the water intake device according to the present invention. [Figure 4] 1 is a cross-sectional view showing a state in which the movable intake weir is installed on the bottom surface of a waterway and water is being taken in by damming up the waterway water. FIG. [Diagram 5] FIG. [Figure 6] 1 is a side view showing a state in which a water intake port provided on one side of a water collecting recess is closed by an opening / closing cover plate. FIG. [Figure 7] 1A and 1B are a perspective view and a partial side view illustrating a channel-shaped main body portion. [Figure 8] FIG. 2 is a partial perspective view showing the configuration of the water intake screen. [Figure 9] FIG. 2 is a cross-sectional view illustrating the water intake action of the water intake screen. [Figure 10] 10 is an explanatory diagram illustrating the flow straightening effect of the flowing water guide plate. FIG. [Figure 11] FIG. 4 is an explanatory diagram illustrating the waterproofing effect of the fin-shaped waterproof rubber. [Figure 12] 13A and 13B are a perspective view and a sectional view illustrating the mutual engagement of wedge-shaped restricting projections. [Figure 13]FIG. 2 is a perspective view illustrating a water intake device having a cover plate portion. [Figure 14] 11 is an explanatory diagram illustrating the function of the cover plate portion. FIG. [Figure 15] 13 is a cross-sectional view illustrating the removal state of garbage that has flowed into the water collection recess when the water intake movable weir is slightly raised. FIG. [Figure 16] FIG. 2 is a perspective view illustrating a water intake device having a liftable partition plate with a fixed upper end. [Figure 17] 10 is an explanatory diagram illustrating the function of the liftable partition plate. FIG. [Figure 18] FIG. 2 is a perspective view illustrating a water intake device having a lifting partition plate whose upper end is pivotally attached. [Figure 19] 10 is an explanatory diagram illustrating the function of the liftable partition plate. FIG. [Figure 20] 13A and 13B are perspective and sectional views illustrating a holding structure for a lower edge portion of a lift-up partition plate whose upper end portion is pivotally mounted. [Figure 21] This is a cross-sectional view illustrating the removal state of garbage that has flowed into a water collection recess when a water-intake movable weir having a lifting partition plate whose upper end is pivotally attached is in a slightly raised position. [Figure 22] FIG. 13 is a perspective view illustrating an embodiment in which a water intake device having a lifting partition plate whose upper end is pivotally attached is provided at a drop section. [Figure 23] This is a cross-sectional view. [Figure 24] This is a cross-sectional view illustrating the removal state of garbage that has flowed into the water collection recess when a water intake device having a lifting partition plate whose upper end is pivotally attached is installed at a drop section and the movable water intake weir is slightly raised. [Diagram 25] FIG. 2 is a perspective view illustrating a water intake device equipped with a tilting dam plate. [Figure 26] FIG. 2 is an explanatory diagram illustrating the function of the tilting dam plate. [Figure 27] 1 is a cross-sectional view illustrating the removal state of garbage that has flowed into a bottom recess in a water intake device having a tilting dam plate in the bottom recess when the movable water intake dam is slightly raised. FIG. [Figure 28]FIG. 13 is a perspective view illustrating an embodiment in which a water intake device having a tilting dam plate is provided at a drop section. [Figure 29] FIG. 2 is an explanatory diagram illustrating the function of the tilting dam plate. [Diagram 30] 1 is a cross-sectional view illustrating the removal state of garbage that has flowed into the bottom recess in a water intake device equipped with a tilting weir plate when the movable water intake weir is slightly raised. FIG. [Diagram 31] FIG. 4 is a cross-sectional view showing another embodiment of the water intake device. [Diagram 32] A side view showing the state in which the water intake box-shaped body is reinforced with an annular reinforcing member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLES

[0029] 1 to 4, a water intake device 1 according to the present invention comprises a movable intake weir 3 that is interposed in a waterway 2 with a flat waterway bottom 9 and can move up and down, and is configured to take in water by damming up the waterway water when the movable intake weir 3 is in a lowered state. The movable intake weir 3 is provided with a water intake screen 5 that allows the waterway water that has overflowed its upper end 4 to flow down and filters a portion of the flowing water so that it can be taken in at its lower surface, and the lower end surface 6 of the movable intake weir 3 is provided with a lower end opening 7 that releases the water taken in by the intake screen 5. A water collection recess 10 is recessed into the waterway bottom 9 of the waterway 2, and when the movable water intake weir 3 is lowered and installed at the waterway bottom 9 in a damming state, the lower end surface portion 6 covers the upper end portion 10a of the water collection recess 10 and the lower end open portion 7 communicates with the water collection recess 10, so that a water collection section 11 for collecting water taken in by the water intake screen 5 is formed between the water collection recess 10 and the lower end surface portion 6. This will be described in detail below.

[0030] In this embodiment, the movable intake weir 3 is configured to have a water intake box-shaped body 12 as shown in Figures 3 and 4, and left and right weir plates 17, 19 extending in the width direction are provided in opposite left and right directions on left and right ends 15, 16 of the upstream end 13 of the waterway of the water intake box-shaped body 12 as viewed in the width direction of the waterway 2. Then, when the movable intake weir 3 is installed on the waterway bottom 9 (Figures 1 and 4), the water intake box-shaped body 12 and the left and right weir plates 17, 19 are configured to close the waterway 2 and weir up the waterway water to take in water, as shown in Figure 2. Here, "left and right" refers to the left and right sides as viewed in the upstream direction of the waterway.

[0031] The water intake box 12 is formed of a metal plate as shown in Figs. 3-4 and 7, and has a horizontal upper plate 22 protruding horizontally toward the downstream of the waterway at the upper end 21 of the standing plate 20, a horizontal lower plate 25 protruding horizontally toward the downstream of the waterway at the lower end 23 of the standing plate 20, and a main body 29 formed by connecting an extended horizontal lower plate 27 to a tip 26 of the horizontal lower plate 25. The horizontal lower plate 25 and the extended horizontal lower plate 27 in a connected state constitute the lower end surface 6, and the lower end open portion 7 is provided on the extended horizontal lower plate 27 or across the extended horizontal lower plate 27 and the horizontal lower plate 25, and the left and right open ends 30, 31 of the main body 29 are closed by left and right side plates 32, 33 (Figs. 2-3). In addition, a water intake screen 35 is provided which slopes downward toward the downstream of the waterway to allow the water in the waterway that has overflowed the upper end 21 of the upright plate portion 20 (the upper end of the movable water intake weir 3) to flow down and filter part of the flowing water so that it can be taken in at the lower side 35 (Figure 4).The upper and lower ends 37, 39 of the water intake screen 35 are directly or indirectly connected to the tip 28 of the horizontal upper plate portion 22 and the tip 40 of the extended horizontal lower plate portion 27.

[0032] As shown in Figures 4 and 7, the horizontal upper plate portion 22, the upright plate portion 20, and the horizontal lower plate portion 25 are formed as a single continuous piece by bending a single metal plate, and the base end portion 42 of the extended horizontal lower plate portion 27 and the tip end portion 26 of the horizontal lower plate portion 25 are connected together in an integrated state by welding.

[0033] The metal plate is, for example, a stainless steel plate having a thickness of 6 mm. The main body 29 may be formed by bending the horizontal upper plate 22, the upright plate 20, the horizontal lower plate 25, and the extended horizontal lower plate 27 into a single metal plate, but in this embodiment, in view of the large size of the main body 29, the base end 42 of the extended horizontal lower plate 27 is welded to the tip end 26 of the horizontal lower plate 25 as described above in order to facilitate manufacturing.

[0034] The height of the upright plate portion 20 is, for example, 1000 mm, and the width of the horizontal upper plate portion 22 is set to 150 to 300 mm, for example, 200 mm. The width of the horizontal lower plate portion 27 is formed to be substantially equal to the width of the horizontal upper plate portion 22 in this embodiment, and is set to 150 to 300 mm, for example, 200 mm.

[0035] The main body 29 thus constructed is formed as a channel-shaped body 43 (Figs. 4 and 7) having a high rigidity and a channel-shaped cross section by the horizontal upper plate 22, the upright plate 20, and the horizontal lower plate 25. The left and right open ends 30, 31 (Figs. 4 and 7) of the main body 29 thus constructed are closed by the left and right side plates 32, 33 as shown in Figs. 2 and 3, and the upper and lower ends 37, 39 of the water intake screen 5 are directly or indirectly connected to the tip 28 of the horizontal upper plate 22 and the tip 40 of the extended horizontal lower plate 27, as described above, to form the water intake box 12.

[0036] The water intake box 12 itself has high rigidity because its main body 29 is configured with the channel body 43. In addition, the left and right open ends 30, 31 of the main body 29 are closed by the left and right side plates 32, 33, so that the left and right side plates 32, 33 also function as reinforcing ribs for the main body 29, further improving the rigidity of the water intake box 5. This ensures the strength of the water intake box 12 against water pressure.

[0037] The water intake screen 5 constituting the water intake box-shaped body 12 may be any one that blocks foreign matter such as fallen leaves contained in the flowing water and enables water intake on its underside 35 (Fig. 4). The water intake screen 5 is, for example, as shown in Figs. 8 to 10, a V-shaped cross section that narrows toward the back side, and is made of stainless steel screen bars 45 extending in the left-right direction, which are arranged in multiple stages on top of top-bottom support rails 46 (Fig. 8) that are arranged in a slanted state at required intervals in the left-right direction, to form an integrated lattice-like structure. The screen bars 45 have a wide outer surface 47 with a width of about 5 mm. The screen bars 45 are arranged in multiple stages on the support rails 46 at intervals of about 1 mm, with the outer surface 47 inclined slightly downward toward the downstream side with respect to the slanting line 49 of the water intake screen 36 as shown in Fig. 9, to form the water intake screen 5 having slits 50 for allowing water to flow in.

[0038] The inclination angle of the water intake screen 36 (the angle of the inclined line 49 (Figure 9)) is set to 30 to 35 degrees, for example about 30 degrees, from the vertical so that foreign objects such as fallen leaves contained in the water flowing down the upper surface (hereinafter referred to as the screen surface) 51 of the water intake screen 5 are not likely to get caught, and the lower portion of the water intake screen 5 is formed hollow as shown in Figure 4.

[0039] As described above, the upper end 37 of the water intake screen 5 is directly or indirectly connected to the tip portion 28 of the horizontal upper plate portion 22. In this embodiment, as shown in Figures 3 to 4, the upper end of the water intake screen 36 is indirectly connected to the tip portion 28 of the horizontal upper plate portion 22 via a running water guide plate 52. As shown in Figures 3 to 4, the flowing water guide plate 52 has a downstream portion on the water channel configured as an upwardly convex arc-shaped plate portion 53, and an upstream portion on the water channel configured as a horizontal plate portion 55.

[0040] 4, a lower end 56 of the arcuate plate portion 53 is connected to the upper end 37 of the water intake screen 5, and a tip 54 of the horizontal plate portion 55 is connected to the tip portion 28 of the horizontal upper plate portion 22. In addition, the lower end 39 of the water intake screen 5 is indirectly connected to the tip of the extended horizontal lower plate portion 27 via, for example, an L-shaped connecting member 57 welded to the tip of the extended horizontal lower plate portion 27.

[0041] The horizontal upper plate portion 22 increases the flow velocity of the raised waterway water to facilitate the flow of garbage in the waterway water downstream, and the flowing water guide plate 52 regulates the flow velocity to facilitate the smooth flow of water to the water intake screen 5. The filtered water that falls on the lower surface side 35 of the water intake screen 5 is discharged from the lower end open portion 7 and stored in the water collection portion 11.

[0042] As shown in Fig. 3, the side panels 32, 33 closing the left and right open ends 30, 31 of the main body 29 have a left side edge 59 extending from the left edge of the horizontal upper panel 22 to the left edge of the water intake screen 5, and a right side edge 60 extending from the right edge of the horizontal upper panel 22 to the right edge of the water intake screen 5, on which left and right guide walls 61, 62 are provided in a continuous manner to reliably guide the raised channel water to the water intake screen 5. The height of the left and right guide walls 61, 62 is set to, for example, about 100 mm. The guide walls 61, 62 are formed by the upper end portions of the left and right side panels 32, 33.

[0043] The left and right weir plates 17, 19 are formed of metal plates (e.g. stainless steel plates) having a thickness of, for example, 6 mm, and are protruded by welding in opposite directions so as to extend in the width direction of the waterway at left and right ends 15, 16, as viewed in the width direction of the waterway, of the upstream end portions of the left and right side plates 32, 33 that constitute the water intake box 12. Tips 17a, 19a of the left and right weir plates 17, 19 are adjacent to inner surfaces 90, 91 of the left and right dams 65, 66, as shown in Figure 2.

[0044] In this embodiment, as shown in Fig. 2, the upstream surface 67, 69 of the weir plates 17, 19 is flush with the upstream surface 70 of the intake box 12, and the upper ends 17a, 19a of the weir plates 17, 19 match the upper ends 61a, 62a of the guide walls 61, 62, as shown in Fig. 3. Therefore, when the intake box 12 is installed on the waterway bottom 9 (Fig. 1), the waterway water that has been weired up to the height of the upper ends of the guide walls 61, 62 is collected between the left and right guide walls 61, 62 as shown by the arrows in Fig. 3 and supplied to the water intake screen 5.

[0045] 2 and 3, protrusions 77, 78 for mounting a support member 76 that pivotally supports a lower end portion 75 of a rack rod 73 (described later) are provided on each of the left and right side portions (formed by the left and right side plates 32, 33) of the water intake box 12 when viewed in the waterway width direction. In this embodiment, the protrusions 77, 78 are configured as a collecting pipe body 79 having sufficient strength.

[0046] In the collecting pipe 79, a base end portion 81 of a lower pipe 80 formed slightly longer in the waterway extension direction below the side plates 32, 33 is welded to the side plates 32, 33, and base ends 83, 83 of rectangular upper pipes 82, 82 formed slightly longer in the waterway extension direction, positioned slightly above the lower pipe 80 and on the upstream and downstream sides of the waterway, are welded to the side plates 32, 33. The upper pipes 82, 82 are connected to each other and the upper pipe 82 and lower pipe 80 are connected by welding with a reinforcing member 85 such as a reinforcing plate.

[0047] In this embodiment, a reinforcing means 86 is used to increase the water pressure resistance of the left and right dam panels 17, 19. In this embodiment, as shown in Fig. 2, the reinforcing means 86 is configured as a means for connecting the left and right dam panels 17, 19 and the upstream surface parts 87 of the protrusions 77, 78 on the waterway by welding with a connecting plate 89.

[0048] The movable water-intake weir 3 is configured to be vertically movable while being interposed in the waterway 2. In this embodiment, as shown in Figures 1 and 2, outer end portions 95, 96 of the protrusions 77, 78 are fitted into left and right guide grooves 92, 93 that are continuously provided in the vertical direction on opposing inner sides 90, 91 of the left and right weirs 65, 66, so that the movable water-intake weir 3 is vertically movable along the guide grooves 92, 93.

[0049] With the left and right outer end portions 95, 96 of the left and right protrusions 77, 78 fitted into the opposing guide grooves 92, 93, the tips 17a, 19a of both dam plates 17, 19 are in close proximity to the inner surfaces 90, 91 of the dam 65, 66, as shown in Figures 2 and 11. In order to prevent water from leaking through gaps between the tips 17a, 19a and the inner surfaces 90, 91, as shown in Figures 2 and 11, a vertically long fin-shaped waterstop rubber 101 is bolted to the surface portions 100, 100 on the upstream side of the waterway at the tips of the dam plates 17, 19, and a tip edge portion 102 of the waterstop rubber 101 is in elastic pressure contact with the inner surfaces 90, 91 of the dam 65, 66.

[0050] 1 and 2, the opposing left and right guide grooves 92, 93 are formed by arranging left and right channel steels 103, 105 that are long in the vertical direction, with the openings of the left and right guide grooves 92, 93 facing each other. The left and right columnar channel steels 103, 105 extend above the dams 65, 66, as shown in FIG. 1, and their upper ends are connected to each other by a cross member 106.

[0051] Furthermore, as shown in Figures 2-3 and 12, the downstream surface portions 107, 109 of the protrusions 77, 78 have wedge-shaped regulating projections 113 protruding therefrom which can engage with wedge-shaped regulating projections 112 protruding from inner surfaces 110, 111 facing the upstream side of the guide grooves 92, 93, and when the water-intake type movable weir 3 is lowered, the abutting engagement of the two regulating projections 112, 113 stabilizes the water-intake movable weir 3 in the lowest position shown in Figures 1 and 4.

[0052] In this embodiment, the movable water-intake weir 3 is moved up and down by a lifting device 116 comprising a rack rod 73 and a rack drive device 121, as shown in Fig. 1. The rack rod 73 is journalled to support members 76, 76 (Figs. 1-3) welded to upper surfaces 117, 119 of the protrusions 77, 78 arranged on the left and right, as shown in Figs. 1-3, and extends upward, with a rack being provided continuously in the vertical direction. The rack rod 73 is inserted into a vertical insertion hole (not shown) provided in the cross member 106, protrudes above the cross member 106 (Fig. 1), and the rack drive devices 121, 121 are provided on the left and right ends of the upper surface of the cross member 106.

[0053] The left and right rack drive devices 121, 121 are connected by a rotating connecting shaft 122, and when driven forward and backward by a reduction motor 123 provided on one of the rack drive devices 121a, pinions (not shown) provided on both ends of the rotating connecting shaft 122 are rotated, causing the left and right rack rods 73, 73 to move up and down, and therefore the water intake movable weir 3 to move up and down.

[0054] The lower end surface 6 of the movable intake weir 3 is provided with the lower end open portion 7 for releasing the water taken in by the intake screen 5, as described above (Fig. 4). In this embodiment, as shown in Fig. 7, the lower end open portion 7 is configured in the extended horizontal lower plate portion 27 with, for example, three lower end open portions 7 each having a rectangular shape that is long in the extension direction of the waterway, arranged in parallel at required intervals in the width direction of the waterway.

[0055] 4-5, the water collecting recess 10 is provided by digging down the bottom of the waterway 2, and has a rectangular shape elongated in the extension direction of the waterway 2 in a plan view, with an open upper end. The water collecting recess 10 is formed by pouring concrete in this embodiment, and its inner wall surface portion 126 and its upper end peripheral portion 127 are covered with a steel plate such as a stainless steel plate. This makes it possible to prevent the water collecting recess 10 from being damaged by large stones or driftwood that flow down the waterway when the water level rises.

[0056] 4-5, in this embodiment, the water collecting recess 10 has an inner wall surface 129 on the upstream side of the water channel as viewed in the extension direction of the water channel 2 and opposing side wall surfaces 130, 130 formed as vertical surfaces, an inner wall surface 131 on the downstream side of the water channel is an inclined surface 131a that slopes upward toward the downstream side of the water channel from its lower end to its upper end, and a bottom surface 134 of the water collecting recess 10 is a horizontal surface. The inclination angle of the inclined surface 131a with respect to the horizontal plane is set to about 40 degrees.

[0057] As shown in Figure 4, when the water intake movable weir 3 is lowered and installed at the water channel bottom 9 of the water channel 2 in a damming state, the lower end surface portion 6 covers the upper end portion 10a of the water collection recess 10, the lower end open portion 7 is connected to the water collection recess 10, and the water collection portion 11 is formed between the water collection recess 10 and the lower end surface portion 6, which collects the water taken in by the water intake screen.

[0058] In order to obtain the dammed state, in this embodiment, as shown in Figures 4(A) and (C), a water stop rubber 133 is disposed continuously from a lower end portion 132 of the upstream surface of the waterway of the water intake box 12 to the lower end portions of the upstream surfaces of the weir plates 17, 19, and the water stop rubber 133 is fixed with bolts. The water stop rubber 133 protrudes downward by about 20 mm from the lower end surface of the water intake box 12. Then, when the movable intake weir 3 is installed on the bottom 9 of the waterway, a lower edge portion 135 of the water stop rubber 133 is configured to be pressed against the bottom 9 of the waterway, and the dammed state is obtained by this pressing.

[0059] As described above, the state where the lower end surface portion 6 covers the upper end portion 10a of the water collecting recess 10 is in an abutting state in this embodiment, as shown in FIG. 4(A), where the upper end peripheral portion 127 of the water collecting recess 10 and the peripheral portion 136 of the lower end surface portion 6 are in abutting contact with each other. The abutting state may be a state where there is no gap between them, or a state where there is a small gap between them. The small gap may be formed by itself due to the unevenness of the upper end peripheral portion 127, or may be formed as a gap between intermediate pieces interposed at a required interval between the upper end peripheral portion 127 and the peripheral portion 136 of the lower end surface portion 6. In this embodiment, the abutting state is a state where there is a small gap between them due to the unevenness of the upper end peripheral portion 127.

[0060] When this abutting state is achieved, the lower end surface portion 6 covers the upper end portion 10a of the water collection recess 10, and as shown in Figure 4, the lower end open portion 7 is connected to the water collection recess 10, and a water collection portion (the depth of the water collection portion is, for example, approximately 30 to 40 cm) 11 that collects the taken water is formed between the lower end surface portion 6 of the water intake movable weir 3 and the water collection recess 10.

[0061] 6, a water intake 139 is provided on one side 130a of the water collecting recess 10 to utilize the water stored in the water collecting portion 11 for snow melting or the like. The water intake 139 is configured as, for example, a rectangular opening 140, which can be opened and closed by an opening and closing cover plate 141. The opening and closing cover plate 141 is configured so that its upper edge portion 142 can be opened and closed by a hinge mechanism 145 attached to an upper edge portion 143 of the water intake 139, and can be held in an open state by a holder. When taking in water, the opening and closing cover plate 141 is held in an open state, and in this state the water intake 139 communicates with an inlet of a water conveyance pipe (not shown) that is buried on the dam side. In this embodiment, the water pipe is connected to a water tank 146 provided in the dam 66, and a submersible pump 147 is installed in the water tank 146 (FIGS. 1 to 2).

[0062] To take in water using the water intake device 1 having such a configuration, the water intake movable weir 3 is lowered and placed in a dammed state where the water intake movable weir 3 is installed on the waterway bottom 9 (Figs. 1 and 4). In this dammed state, a required overflow water depth (a water depth of about 3 to 10 cm obtained by the guide vertical walls 61, 62) is obtained at the upper end 4 of the water intake movable weir 3, and the peripheral portion 136 of the lower end surface portion 6 of the water intake movable weir 3 is in contact with the upper end peripheral portion 127 of the water collecting recess 10. The waterway water that has overflowed the upper end 4 of the water intake movable weir 3 flows downstream along the inclined screen surface 51, as shown in Fig. 9.

[0063] When the channel water flows down the flowing water guide plate 52 and the screen surface 51, fallen leaves and other debris are blocked, and a part of the flowing water passes through the slits 50 (FIG. 9) of the water intake screen 5 and falls on the lower surface 35 thereof. The filtered water thus fallen is stored in the water collection section 11, and then flows into the water storage tank 146 provided in the dam via the water conveyance pipe. The inflow water is transported to a specified location via the water supply pipe 148 by the operation of the submersible pump 147 housed in the water storage tank 146, and is used for snow melting, agricultural water, industrial water, etc.

[0064] In this embodiment, the abutment of the peripheral portion 136 against the upper end peripheral portion 127 is in a state in which there is a small gap between them, so that a portion of the water flowing into the water collection section 11 flows out through the gap into the waterway 2, and this outflow action prevents debris in the water in the waterway from flowing into the water collection section 11.

[0065] Here, when comparing the amount of water intake per unit time by the water intake device 1 of this embodiment with the amount of water intake per unit time by the water intake device of Patent Document 1, the amount of water intake by the water intake device of this embodiment is greater.

[0066] The reason is that in the water intake device according to Patent Document 1, the bottom side of the water intake device is the water intake tank, so the lower edge of the water intake screen had to be set at the upper edge of the downstream end of the water intake tank, whereas in the water intake device according to this embodiment, the lower edge of the water intake screen according to Patent Document 1 can be brought close to the bottom of the waterway (Fig. 4). This makes it possible to extend the water intake screen in a downward inclined state by approximately the height of the water intake tank (about 30 to 40 cm), and therefore it is possible to increase the water intake area of ​​the water intake screen.

[0067] When water is taken in only for a certain period of time for the purpose of melting snow, when water collection is not required in summer, or when the water level of the waterway rises abnormally due to a large flood, the movable water intake dam 3 is raised as shown by the dashed line in Fig. 1. When the movable water intake dam 3 is raised in this way, the garbage that has been blocked by the movable water intake dam 3 flows into the water collection recess 10 on the flowing water. However, even if the garbage flows in like this, since the inner wall surface portion 131 on the downstream side of the waterway is an upwardly inclined surface portion 131a, the garbage that has flowed into the water collection recess 10 can be easily removed by utilizing the flow velocity of the waterway water. In this embodiment, the inner surface portion of the water collection recess 10 is covered with a steel plate such as a stainless steel plate, so that the garbage can be removed more smoothly by reducing friction.

[0068] After the debris is removed from the water-collecting recess 10, the water intake port 139 (FIG. 6) is closed with the openable cover plate 141 to prevent the ingress of debris.

[0069] In addition, the water intake device 1 according to this embodiment is configured such that the lower end of the water intake movable weir 3 is opened by providing the lower end opening portion 7 on the lower end surface portion 6 of the water intake movable weir 3, and does not have a water intake tank as in Patent Document 1, but is configured such that the water collection portion 11 is formed between the lower end surface portion 6 and a water collection recess 10 formed by digging down the waterway bottom 9. Therefore, when using the water intake device 1 according to this embodiment, it is not necessary to simultaneously lift a lot of water (2 to 3 tons in some cases) when the movable weir is raised, as in the water intake device according to Patent Document 1. Therefore, when using the water intake device 1 according to this embodiment, the lifting load of the water intake movable weir 3 can be small. Therefore, the water intake device 1 according to this embodiment does not require a lifting device with a large capacity as in the conventional device, and is economical in that the cost of the water intake device can be reduced by miniaturizing the lifting device 116 (Figure 1).

[0070] Furthermore, since the water intake device 1 forms the water collecting portion 11 between the water collecting recess 10 and the lower end surface portion 6, it does not require a water intake tank as required in Patent Document 1. Therefore, when the water intake device 1 of this embodiment is used, the size of the components of the water intake movable weir 3 can be made smaller, and the structure of the water intake movable weir 3 can be simplified, making it possible to reduce the weight of the water intake movable weir 3. Therefore, when the water intake device 1 of this embodiment is used, it is economical in that it is possible to improve the ease of construction when assembling the water intake device 1 at the construction site and to reduce the price of the water intake device 1.

[0071] In particular, as described above, the water intake device of this embodiment is configured so that the movable water intake weir 3 has the water intake box-shaped body 12 (Figure 4), so below we will refer to the unique action and effect of the water intake device 1 having the water intake box-shaped body.

[0072] As described above (Figure 2, etc.), the movable water intake weir 3 has left and right weir plates 17, 19 extending in the width direction protruding in opposite directions from the left and right ends 15, 16 of the upstream end portion 13 of the waterway of the water intake box-shaped body 12, as viewed in the width direction of the waterway, and is configured so that when the movable water intake weir 3 is installed on the bottom 9 of the waterway, the water intake box-shaped body 12 and the left and right weir plates 17, 19 close the waterway 2 and dam up the water in the waterway to take in the water. The water intake box 12 is made of a metal plate, and has a horizontal upper plate 22 that protrudes horizontally toward the downstream side of the waterway from the upper end 21 of an upright plate 20, a horizontal lower plate 25 that protrudes from the lower end 23 of the upright plate 20, and a main body 29 formed by integrally connecting the extended horizontal lower plate 27 to the tip 26 of the horizontal lower plate 25. The left and right open ends 30, 31 of the main body 29 are closed by left and right side plates 32, 33, and the upper and lower ends 37, 39 of a water intake screen 36 that slopes downward toward the downstream of the waterway are directly or indirectly connected to the tip 28 of the horizontal upper plate 22 and the tip 40 of the extended horizontal lower plate 27, thereby forming the water intake box 12.

[0073] The horizontal upper plate 22, the upright plate 20 and the horizontal lower plate 25 which constitute the main body 29 are configured as a highly rigid channel-like body 43 by a series of bends of metal plates. The left and right open ends 30, 31 of the main body 29 are closed by left and right side plates 32, 33, which also function as reinforcing ribs for the main body 29. As a result, the water intake box 12 is a highly rigid structure.

[0074] Therefore, the entire internal space of the water intake box 12 can function as a water intake tank while ensuring strength against water pressure.

[0075] Then, with the movable water intake weir 3, which has left and right weir plates 17, 19 protruding from the left and right ends of the water intake box-shaped body 12, installed on the water channel bottom 9, the water channel 2 can be closed and the water in the channel can be dammed.

[0076] To explain this in more detail, the bending moment due to water pressure acting on the movable intake weir 3 with the waterway 2 closed is greater toward the center of the width of the waterway 2, so a large bending moment acts on the water intake box 12 installed on the bottom 9 of the waterway, but the water intake box 12 can resist this bending moment because of its high rigidity as described above. This is because, as described above, the water intake box 12 is not a structure reinforced with many connecting members or reinforcing members, but is a highly rigid structure as described above, and strength against water pressure is ensured.

[0077] Specifically, firstly, this is because the main body 29 forms the channel-like body 43 (Fig. 4) with high rigidity by the horizontal upper plate 22, the upright plate 20, and the horizontal lower plate 25. Secondly, whereas the movable weir in Patent Document 1 is independent of the water intake device and only the movable weir alone can function as a weir, in the present invention, the entire water intake box-like body 12 with high rigidity, the entire internal space of which can also serve as a water intake tank, can function as a weir. EXAMPLES

[0078] Figures 13 to 15 show other embodiments of the water intake device 1 according to the present invention, the basic configuration of which is the same as in embodiment 1, and comprises a water intake movable weir 3 which is interposed in a waterway 2 having a flat waterway bottom 9 and can move up and down, and the water intake movable weir 3 has a water intake screen 5 which allows the water that has overflowed its upper end 4 to flow down and filters some of the flowing water so that it can be taken in at the lower side 35, and is arranged in a state in which it is inclined downward toward the downstream of the waterway (the inclination angle is the same as in embodiment 1, 30 to 35 degrees from the vertical), and the lower end surface 6 of the water intake movable weir 3 is provided with a lower end opening portion 7 of the same configuration as in embodiment 1 which releases the water taken in by the water intake screen 5. A water collection recess 10 is recessed into the waterway bottom 9 of the waterway 2, and when the water intake movable weir 3 is lowered and installed on the waterway bottom 9 in a damming state, the lower end surface portion 6 covers the upper end portion 10a of the water collection recess 10 and the lower end open portion 7 communicates with the water collection recess 10, and a water collection section 11 for collecting water taken in by the water intake screen 5 is formed between the water collection recess 10 and the lower end surface portion 6. In this embodiment, the fact that the water intake movable weir 3 is configured to have the water intake box-shaped body 12 and the configuration for moving the water intake movable weir 3 up and down are the same as in embodiment 1, so a description thereof will be omitted.

[0079] The water intake device 1 of this embodiment differs from the water intake device 1 of embodiment 1 in that the lower end surface portion 6 of the movable water intake weir 3 is formed by connecting a cover plate portion 152 to a downstream end portion (hereinafter referred to as the downstream end portion) 151 of a lower end surface portion main body 150 having the lower end open portion 7. When the lower end surface portion 6 covers the upper end portion 10a of the water collecting recess 10, the lower end open portion 7 communicates with a portion 153 forming the upstream side of the water collecting recess 10, and the cover plate portion 152 closes an upper end open portion 156 of a portion 155 forming the downstream side of the water collecting recess 10. As a result, the water collecting portion 11 that collects the taken water is formed between the water collecting recess 10 and the lower end surface portion 6.

[0080] In this embodiment, the lower end surface portion main body 150 is formed with the lower end open portion 7 consisting of an opening portion, for example, as in the first embodiment. When the movable water intake weir 3 descends and is installed in the waterway bottom 9 of the waterway 2 in the damming state, the entire circumference of the peripheral portion 136 of the lower end surface portion 6 comes into contact with the entire circumference of the upper end peripheral portion 127 of the water collecting recess 10 (Figs. 13 to 15) (Figs. 13 to 14), so that the lower end surface portion 6 is covered by the upper end portion 10a of the water collecting recess 10, as described above. In this covered state, the lower end open portion 7 communicates with the upstream portion 153 of the water collecting recess 10, and the cover plate portion 152 closes the upper end open portion 156 of the downstream portion 155 of the water collecting recess 10 in a horizontal state that is the extension direction of the waterway 2. As a result, a water collection section 11 (the depth of the water collection section is, for example, about 30 to 40 cm) that collects the taken water is formed between the lower end surface portion 6 of the movable water intake weir 3 and the water collection recess 10.

[0081] Here, the damming state is achieved by attaching a water-stop rubber 133 (Fig. 14) in the same manner as in Example 1. The abutment state of the lower end surface portion 6 of the movable water-intake weir 3 against the waterway bottom portion 9 may be such that there is almost no gap between them, or such that a small gap is formed between them. The small gap may be formed naturally due to the unevenness of the upper end peripheral portion 127, or may be formed, for example, as a gap between intermediate pieces interposed at a required interval between the upper end peripheral portion 127 and the peripheral portion 136 of the lower end surface portion 6. In this example, the abutment state is such that a small gap is formed between them.

[0082] The cover plate 152 in a horizontal, closed state prevents debris contained in the waterway from flowing into the water collection recess 10. The cover plate 152 is made of, for example, a stainless steel plate, and has a thickness of 6 mm and a horizontal length in the horizontal state (length seen in the extension direction of the waterway) of 400 to 500 mm.

[0083] In this embodiment, as shown in Figure 14, when viewed in the horizontal state, the cover plate portion 152 has an upstream end 157 of the waterway pivotally attached to the downstream end 151 of the lower end surface portion 6 via a hinge mechanism 159 so as to be rotatable in a vertical plane around the widthwise axis of the waterway 2, and can assume an inclined flip-up state shown by the dotted line in Figure 14 from the closed state shown in Figures 13-14, and can also assume a hanging state in the raised state.

[0084] In this embodiment, as shown in Figures 13 and 14, the water collection recess 10 is recessed into the water channel bottom 9 of the water channel 2, and in a plan view, has a rectangular shape that is elongated in the extension direction of the water channel 2 and is open at the upper end.

[0085] The water collecting recess 10 is formed by pouring concrete, and as in the first embodiment, its inner surface and the upper peripheral edge portion are protected by being covered with a steel plate such as a stainless steel plate.

[0086] 13-14, the water collecting recess 10 has an inner wall surface 129 on the upstream side of the water channel as viewed in the extension direction of the water channel 2 and opposing side wall surfaces 130, 130 formed as vertical surfaces, an inner wall surface 131 on the downstream side of the water channel is formed as an inclined surface 131a that slopes upward from its lower end to its upper end toward the downstream side of the water channel, and a bottom surface 134 of the water collecting recess 10 is formed as a horizontal surface. The inclination angle of the inclined surface 131a with respect to the horizontal plane is set to about 40 degrees.

[0087] A water intake 139 is provided at the upstream side of the waterway of one of the side walls 130a to utilize the water stored in the water collection section 11 for snow melting and the like. The water intake 139 is configured as, for example, a rectangular opening, and the water intake 139 can be opened and closed by an opening and closing cover plate 141. In this embodiment, as shown in Figs. 13-14, the opening and closing cover plate 141 is 123, and its upper edge portion 142 is openably attached to the upper edge portion 143 of the water intake 139 via a hinge mechanism 145, and can be held in an open state via a holder. During the water intake, the opening and closing cover plate 141 is held in an open state as shown by a thick dashed line in Fig. 13, and in this state, the water intake 139 communicates with a water tank (not shown) provided in the dam via a water pipe 144, for example, in the same manner as described in the first embodiment.

[0088] To take in water using the water intake device 1 having such a configuration, the water intake movable weir 3 is lowered so that the peripheral portion 136 of the lower end surface portion 6 of the water intake movable weir 3 abuts against the entire circumference of the upper end peripheral portion 127 of the water collecting recess 10, as shown in Figures 13 and 14. In other words, the water intake movable weir 3 is placed on the waterway bottom 9 in a damming state. In this damming state, the overflow depth at the upper end 4 of the water intake movable weir 3 is about 30 to 50 mm.

[0089] The waterway water that overflows the upper end 4 of the movable intake weir 3 flows downstream over the inclined screen surface 51. As it flows down the screen surface 51, fallen leaves and other debris are blocked, and a portion of the flowing water falls on the underside of the slits 50 (Fig. 8) in the intake screen 5. The water that falls in this way is collected in the water collection section 11, and then flows into the water tank via the water conveyance pipe 144, and is transported to a specified location via a water supply pipe by the operation of a submersible pump housed in the water tank, and is used as snow melting water, agricultural water, industrial water, etc.

[0090] In this embodiment, as described above, the abutment state of the peripheral portion 136 of the lower end surface portion 6 against the upper end peripheral portion 127 is such that a small gap is formed between the entire circumference of the peripheral portion 136 and the upper end peripheral portion 127. Therefore, a part of the water that flows into the water collection portion 11 flows out into the waterway through the small gap. This outflow action prevents debris in the waterway from flowing into the water collection portion 11.

[0091] Here, when comparing the amount of water intake per unit time by the water intake device 1 of this embodiment with the amount of water intake per unit time by the water intake device of Patent Document 1, the amount of water intake by the water intake device of this embodiment is greater.

[0092] The reason is the same as that described in Example 1, and is that when the water intake device of this example is used, the water intake screen 5 can be extended downward at the same inclination angle by approximately the height of the water intake tank of Patent Document 1 (approximately 30 to 40 cm), and as a result, the water intake area of ​​the water intake screen 5 can be increased.

[0093] When water is taken only for a certain period of time for purposes such as snow melting, or when water collection is not required during summer or other times, or when the water level in the waterway rises abnormally due to a flood, the movable water-intake weir 3 is raised as shown in Figure 15, and the water intake 139 in the waterway 2 is closed with the opening / closing cover plate 141 to prevent debris from entering.

[0094] Moreover, the water intake device 1 according to this embodiment is configured such that the lower end of the movable water intake weir 3 is opened by providing the lower end open portion 7 (FIG. 14) on the lower end surface portion 6, and does not have a water intake tank as in Patent Document 1. The water collection portion 11 is formed between the lower end surface portion 6 and a water collection recess 10 formed by digging down the waterway bottom 9. Therefore, when the water intake device 1 according to this embodiment is used, it is not necessary to simultaneously lift a large amount of water (2 to 3 tons in some cases) when lifting the movable water intake weir 3. Therefore, the lifting load of the movable water intake weir 3 can be small. Therefore, when the water intake device 1 according to this embodiment is used, a lifting device with a large capacity as in the conventional device is not required, and the cost of the water intake device can be reduced by miniaturizing the lifting device 116 (FIG. 1). This is economical. Furthermore, because the movable intake weir 3 does not have a water intake tank as in Patent Document 1, the size of the components of the movable intake weir 3 can be made smaller and the structure can be simplified, thereby making it possible to reduce the weight of the movable intake weir 3. Therefore, the water intake device 1 of this embodiment is economical in that it improves the ease of construction when assembling the water intake device 1 at the construction site and reduces the price of the water intake device.

[0095] With the water-intake movable weir 3 raised, the cover plate portion 152 is in a drooping state at the downstream end portion 151 (FIG. 14) of the lower end surface portion main body 150. Since the cover plate portion 152 in this drooping state is dangerous if it is blown about by a strong wind, it is advisable to fix it to the water-intake movable weir 3 via an appropriate fixing means.

[0096] When the length of the cover plate portion 152 in the waterway extension direction is short, for example, about 100 to 200 mm, the cover plate portion 152 itself has high rigidity, so that the cover plate portion 152 may be integrally connected to the downstream end portion 151 in a horizontally protruding state. In this case, when the water-intake movable weir 3 is in the raised state, the cover plate portion 152 is in a horizontally protruding state at the downstream end portion 151 of the water-intake movable weir 3.

[0097] When the water intake device 1 starts to be lifted in this manner, the debris that has been blocked by the movable water intake dam 3 is carried by the flowing water and flows into the water collection recess 10, as shown in Fig. 15. However, even if debris flows in like this, the cover plate portion 152 is lifted by the water flow and is in a splashed-up state as shown in Fig. 15, and the inner wall surface portion 131 on the downstream side of the waterway is an upwardly inclined surface portion 131a, so that the debris that has flowed into the water collection recess 10 is well removed by the flow velocity of the waterway. Furthermore, since the removal of debris caused by the lifting up of the cover plate portion 152 takes place at a location downstream of the downstream end portion 151 of the lower end surface portion main body 150 of the movable water intake weir 3, debris that flows into the water collection recess 10 can be prevented from flying up and adhering to the water intake screen 5, making it easier to clean the water intake screen 5 and facilitating the maintenance and management of the water intake device 1.

[0098] In this embodiment, since the inner surface of the water collecting recess 10 is covered with a steel plate such as a stainless steel plate, the removal of the dust can be performed more smoothly with reduced friction. EXAMPLES

[0099] 16-17 and 18-19 show another embodiment of the water intake device 1 according to the present invention, the basic configuration of which is the same as in embodiment 1, and includes a movable water intake weir 3 that is interposed in a waterway with a flat waterway bottom 9 and can move up and down. The movable water intake weir 3 is provided with a water intake screen 5 that allows water that has overflowed its upper end 4 to flow down and filters a portion of the flowing water so that it can be taken in at its lower surface 35, and is provided at its lower end surface 6 with a lower end opening 7 of the same configuration as in embodiment 1 for discharging the water taken in by the water intake screen 5. A water collection recess 10 is recessed into the waterway bottom 9 of the waterway 2, and when the movable water intake weir 3 is lowered and installed on the waterway bottom 9 in a damming state, the lower end surface portion 6 covers the upper end portion 10a of the water collection recess 10 and the lower end open portion 7 communicates with the water collection recess 10, so that a water collection section 11 for collecting water taken in by the water intake screen 5 is formed between the water collection recess 10 and the lower end surface portion 6. In this embodiment, the movable water intake weir 3 is configured to have the water intake box-shaped body 12, and the configuration for moving the movable water intake weir 3 up and down is the same as in embodiment 1, so a description thereof will be omitted.

[0100] The water intake device 1 according to this embodiment differs from the water intake devices 1 according to the first and second embodiments in that the water intake device 1 according to this embodiment includes a water collection section 11 having the following configuration, which is different from the water collection section 11 described in the first and second embodiments.

[0101] That is, a bottom recess 160 recessed into the waterway bottom 9 of the waterway 2 is partitioned in the waterway width direction by a lift-up partition plate 161 that can move up and down, thereby forming the water collection recess 10 which is on the waterway upstream side of the lift-up partition plate 161. The lift-up partition plate 161 is installed downward at the downstream end portion 151 of the lower end surface portion 6 of the movable water intake weir 3, and the water collection recess 10 is formed by the lowering of the lift-up partition plate 161 accompanying the lowering of the movable water intake weir 3, and the lower end surface portion 6 of the movable water intake weir 3 covers the upper end portion 10a of the water collection recess 10. Furthermore, the entire circumference of the peripheral portion 136 of the lower end surface portion 6 is in contact with the entire circumference of the upper end peripheral portion 127 (FIG. 16) of the water collecting recess 10, so that the lower end open portion 7 communicates with the water collecting recess 10, and the water collecting portion 11 that collects the water taken in by the water intake screen 5 is formed between the water collecting recess 10 and the lower end surface portion 6. The water collecting recess 10 and the water collecting portion 11 are formed simultaneously.

[0102] As shown in Figs. 16-17 and 18-19, the bottom recess 160 is recessed by digging down the waterway bottom 9 of the waterway 2, and is rectangular in shape in a plan view in the extension direction of the waterway 2, with an open upper end. The bottom recess 160 is formed by pouring concrete, and as in the first embodiment, its inner surface and the upper end peripheral portion are covered and protected with a steel plate such as a stainless steel plate. The bottom recess 160 has an inner wall surface 129 on the upstream side of the waterway as viewed in the extension direction of the waterway 2 and opposing side wall surfaces 130, 130 formed as vertical surfaces, an inner wall surface 131 on the downstream side of the waterway is an inclined surface 131a that slopes upward from its lower end to its upper end toward the downstream side of the waterway, and a bottom surface 134 of the bottom recess 160 is a horizontal surface. The inclination angle of the inclined surface portion 131a with respect to the horizontal plane is set to about 40 degrees. As shown in Figures 16 and 18, a water intake port 139 is provided on the upstream side of the waterway of one of the side wall portions 130a for utilizing the water stored in the water collection portion 11 for melting snow, etc. The water intake port 139 is configured as, for example, a rectangular opening, and the water intake port 139 can be opened and closed by an opening / closing cover plate 141. The upper edge portion 142 of the opening / closing cover plate 141 is attached to the upper edge portion 143 of the water intake port 139 via a hinge mechanism 145 so as to be able to open and close, and can be held in the open state via a holder. When the water intake is performed with the water channel 2 completely closed by the movable water intake weir 3 as shown in Figures 16-17 and Figures 18-19, the opening / closing cover plate 141 is held in the open position, and in this state the water intake port 139 is connected via a water conveyance pipe 144 to a water tank (not shown) provided in the weir, for example, in the same manner as described in Example 1.

[0103] 17 and 19, the lift-up partition plate 161 is hung down at the downstream end 151 of the lower end surface portion 6 of the movable intake weir 3, and as the lift-up partition plate 161 descends in conjunction with the lowering of the movable intake weir 3, the lower end surface portion 6 of the movable intake weir 3 covers the upper end portion 10a of the water collecting recess 10. The entire circumference of the peripheral portion 136 of the lower end surface portion 6 comes into contact with the entire circumference of the upper end peripheral portion 127 of the water collecting recess 10 (FIGS. 16 and 18), thereby obtaining the covered state (a state in which the movable intake weir 3 is installed on the waterway bottom 9). In this covered state, the lower end open portion 7 is connected to the water collection recess 10, and the water collection section 11 (the depth of the water collection section is, for example, approximately 30 to 40 cm) that collects the water taken in by the water intake screen 5 is formed between the lower end surface portion 6 of the water intake movable weir 3 and the water collection recess 10.

[0104] Here, the damming state is achieved by disposing a water-stop rubber 133 (Figs. 17 and 19) in the same manner as in Example 1. The abutment state of the lower end surface portion 6 of the movable water-intake weir 3 against the waterway bottom portion 9 may be such that there is almost no gap between them, or such that a small gap is formed between them. The small gap is formed naturally by the unevenness of the upper end peripheral portion 127, or, for example, as a gap between intermediate pieces interposed at a required interval between the upper end peripheral portion 127 and the peripheral portion 136 of the lower end surface portion 6. In this example, the abutment state is such that a small gap is formed between them.

[0105] The lift-up partition plate 161 is made of a stainless steel rectangular plate extending in a direction perpendicular to the extension direction of the waterway 2, and has a thickness of, for example, 20 mm. When the lift-up partition plate 161 is in the lowered state, as shown in Figures 16-17 and 18-19, its lower end portion 162 is in contact with the bottom portion 163 of the bottom recess 160, and both end portions 165, 165 viewed in the perpendicular direction are in contact with the opposing side wall portions 164 of the bottom recess 160 over their entire length as shown in Figures 16 and 18. By maintaining the lowered state, the water collecting recess 10 is formed by the portion of the bottom recess 160 upstream of the lift-up partition plate 161.

[0106] As described above, the lift-up partition plate 161 is suspended in a suspending state from the downstream end portion 151 of the lower end surface portion 6 of the movable water-intake weir 3, and there are two types of suspension configurations.

[0107] The first configuration, as shown in Figures 16-17, is a suspended configuration in which the lift-up partition plate 161 is in a hanging state and its upper end portion 166 is fixedly connected to the downstream end portion 151. The second configuration is a suspended configuration in which the lift-up partition plate 161 is in a hanging state and its upper end portion 166 is pivotally attached to the downstream end portion 151 via, for example, a hinge mechanism 168 (Figure 19) so as to be rotatable in a vertical plane (rotatable around an axis perpendicular to the extension direction of the waterway 2).

[0108] The water collecting section 11 is formed by the lower end surface section 6 of the movable water intake weir 3 covering the upper end portion 10a of the water collecting recess 10. The covering state is obtained by the entire circumference of the peripheral portion 136 of the lower end surface section 6 (Figs. 17 and 19) being in abutment with the entire circumference of the upper end peripheral portion 127 of the water collecting recess 10 (Figs. 16 and 18), but in this embodiment, the peripheral portion 136 of the lower end surface section 6 is in abutment with the upper end of the lift-up partition plate 161, both in the "connected state in which the upper end 166 of the lift-up partition plate 161 and the downstream end 151 of the lower end surface section 6 are fixedly connected" in the first configuration and in the "connected state in which the upper end 166 of the lift-up partition plate 161 and the downstream end 151 are pivotally connected" in the second configuration.

[0109] In the case of the first configuration, since the lift-up partition plate 161 is in its hanging state and its shape is fixed, when the lift-up partition plate 161 is lowered in the bottom recess 160, its lower end portion 162 will naturally come into contact with the bottom 163 of the bottom recess 160, and both side end portions 165, 165 will come into contact with the opposing side wall portions 164, 164 of the bottom recess 160, thereby forming the water collection recess 10 that can withstand the water pressure of the collected water.

[0110] On the other hand, in the case of the second configuration, the lift-up partition plate 161 is in its hanging state and its upper end 166 is pivotally attached to the downstream end 151 so that if the lift-up partition plate 161 is simply lowered in the bottom recess 160 as in the first configuration, the lift-up partition plate 161 will not be able to withstand the water pressure of the taken water and will be caused to jump up to the downstream side of the waterway by the water pressure, and the required water collection recess 10 will not be formed.

[0111] Therefore, when the second configuration is adopted, as shown in Figs. 19-20, fitting grooves 170 (Fig. 20(B)) for fitting lower edge portions 169 of both edge portions 167 of the lift-up partition plate 161 are provided in the opposing side wall portions 164. The fitting grooves 170 can be formed by fixing a pair of holding pieces 171 that sandwich the lower edge portions 169 to the opposing side wall portions 164. In this embodiment, the pair of holding pieces 171 forming the fitting grooves 170 are also arranged at a required interval on the bottom 163 of the bottom recess 160. As a result, by lowering the lift-up partition plate 161 in the bottom recess 160 and fitting the lower end edge portions 169, 169 on both sides into the fitting groove portions 170, 170 on both sides and the fitting groove portions 170, 170 provided in the bottom 163, the water collection recess 10 that can withstand the water pressure of the taken water can be formed, and the water collection portion 11 can be formed.

[0112] As described in the first embodiment, the water contained in the water collection section 11 flows into the water tank through the water guide pipe 144 from the water intake 139 provided on the side of the water collection recess 10, and is transported to a designated location through a water supply pipe by the operation of an underwater pump housed in the water tank, and is used for snow melting, agricultural water, industrial water, etc.

[0113] In particular, when the suspension configuration according to the second configuration is adopted, grooves are not provided for fitting the entire vertical edge portions 167,167 on both sides of the lift-up partition plate 161, but fitting grooves 170,170 (Fig. 20(B)) are provided for fitting lower edge portions 169,169 of the edge portions 167,167 on both sides of the lift-up partition plate 161. For this reason, for example, when the water-intake movable weir 3 is raised during a period when water intake is not required, the lift-up partition plate 161 rises as the water-intake movable weir 3 rises, but when the lower edge portions 169,169 of the edge portions 167,167 on both sides come out of the fitting grooves 170,170 on both sides, the lift-up partition plate 161 will naturally open obliquely toward the downstream side of the waterway due to the force of the water flow, as shown in Fig. 21. This open state occurs immediately after the movable water intake dam 3 is lifted slightly, and immediately thereafter, the garbage that was blocked by the movable water intake dam 3 is carried by the running water and flows into the bottom recess 160. Because a gap 172 is generated below the diagonally opened lift-and-lower partition plate 161 and the inner wall surface portion 131 on the downstream side of the waterway is an upwardly inclined surface portion 131a, the garbage that has flowed into the bottom recess 160 is efficiently removed through the gap 172 by the flow velocity of the waterway water.

[0114] This prevents debris that flows into the bottom recess 160 from flying up and adhering to the underside 173 of the water intake screen 5, making it easier to clean the water intake screen 5 and facilitating the maintenance and management of the water intake device 1.

[0115] In this embodiment, since the inner surface of the bottom recess 160 is covered with a steel plate such as a stainless steel plate, the dust can be removed more smoothly with reduced friction.

[0116] Figures 22 to 24 show another embodiment of the water intake device 1 in which the bottom recess 160 recessed into the waterway bottom 9 of the waterway 2 is closed with a lift-up partition plate 161 that can move up and down to form a water collection recess 10 upstream of the lift-up partition plate 161, and a water collection section 11 that collects the taken water is formed between the lower end surface portion 6 of the water intake movable weir 3 and the water collection recess 10, and the bottom recess 160, the water collection recess 10 and the water collection section 11 are provided in the waterway bottom 9 which has a drop.

[0117] That is, in the water intake device 1, the upper channel bottom 9a is connected to the lower channel bottom 9b via a step 175, and the bottom recess 160 is recessed into the upper channel bottom 9a of the channel bottom 9A having a drop, and the entire downstream end 176 of the bottom recess 160 is open toward the downstream side of the channel. The bottom recess 160 is closed by the lift-up partition plate 161 which is movable up and down, thereby forming a water collection recess 10 which is on the upstream side of the lift-up partition plate 161.

[0118] In this case, the abutment portion 177 (Figure 23) between the lower end portion 162 of the lift-up partition plate 161 and the bottom surface portion 163 of the bottom recess 160, and the abutment portion 184 (Figure 22) between the edges 179, 179 on both sides of the lift-up partition plate 161 and the opposing side wall surfaces 180, 180 of the bottom recess 160 are made watertight via gaskets.

[0119] The lifting partition plate 161 is installed downward at the downstream end portion 151 of the lower end surface portion 6 of the water-intake movable weir 3 in the same manner as described above, and the water-collecting recess 10 is formed by the descent of the lifting partition plate 161 accompanying the descent of the water-intake movable weir 3.

[0120] Then, the entire circumference of peripheral portion 136 (Fig. 23) of the lower end surface portion 6 of the water intake movable weir 3 comes into contact 128 with the entire circumference of upper end peripheral portion 127 (Fig. 22) of the water collecting recess 10, thereby obtaining a state in which the lower end surface portion 6 covers the upper end portion 10a of the water collecting recess 10. In this covering state, the lower end open portion 7 communicates with the water collecting recess 10, and the water collecting portion 11 that collects the taken water is formed between the lower end surface portion 6 of the water intake movable weir 3 and the water collecting recess 10.

[0121] Here, the blocking state is achieved by disposing the watertight rubber 133 in the same manner as in Example 1. In this case, the abutting state 128 is a contact state in which the two parts come into contact with each other without any gaps via a packing.

[0122] In the case of the water intake device 1 having this configuration, the presence of a step 175 in the waterway bottom 9 causes the entire end 176 of the bottom recess 160 on the downstream side of the waterway to be open towards the downstream side of the waterway. Therefore, in either the first or second configuration, when the movable water intake weir 3 rises and causes blocked garbage to flow into the bottom recess 160 on the flow of running water, the garbage can be reliably discharged towards the downstream side of the waterway through the end 182 on the downstream side of the waterway, which is in a totally open state.

[0123] Fig. 23 shows the case of the second configuration, in which, for example, when the intake movable weir 3 is raised during a period when water intake is not required, the lifting partition plate 161 rises with the rise of the intake movable weir 3. During this rise, as shown in Fig. 20(B), when the lower end edge portions 169, 169 of the edge portions 167, 167 on both sides come out of the fitting groove portions 170, 170 on both sides and the fitting groove portion 170 provided in the bottom portion 163, the lifting partition plate 161 naturally opens obliquely toward the downstream side of the waterway due to the force of the water flow, as shown in Fig. 21. Therefore, if trash flows into the bottom recess 160, the trash will be discharged more quickly toward the bottom end of the waterway. EXAMPLES

[0124] 25 to 27 show another embodiment of the water intake device 1 according to the present invention, the basic configuration of which is the same as that of the first embodiment, and includes a movable intake weir 3 that is disposed in a waterway 2 having a flat waterway bottom 9 and can move up and down, and is configured to take in water by damming up the waterway water when the movable intake weir 3 is in a lowered state. The movable intake weir 3 is provided with a water intake screen 5 that allows the waterway water that has overflowed its upper end 4 to flow down and filters a portion of the flowing water so that it can be taken in at its lower surface, and is provided with a lower end opening 7 of the same configuration as that of the first embodiment, which releases the water taken in by the intake screen 5, at its lower end surface 6. A water collection recess 10 is recessed into the waterway bottom 9 of the waterway 2, and when the water intake movable weir 3 is lowered and installed at the waterway bottom 9 in a damming state, the lower end surface portion 6 covers the upper end portion 10a of the water collection recess 10, the lower end open portion 7 is connected to the water collection recess 10, and a water collection section 11 that collects the taken water is formed between the water collection recess 10 and the lower end surface portion 6.

[0125] In this embodiment, the fact that the water-intake movable weir 3 is configured to have the water-intake box-shaped body 12 and the configuration for moving the water-intake movable weir 3 up and down are the same as in embodiment 1, so the explanation thereof will be omitted.

[0126] The water intake device 1 according to this embodiment differs from the water intake devices according to the first, second and third embodiments in that the water intake device 1 according to this embodiment includes a water collection section 11 having the following configuration, which is different from the water collection section 11 described in the first, second and third embodiments.

[0127] That is, the water collecting recess 10 is provided on the upstream side of a bottom recess 160 recessed in the waterway bottom 9 of the waterway 2, the bottom recess 160 extends downstream of the waterway beyond the downstream end 151 of the lower end face portion 6 of the movable water intake weir 3, and a tilting weir plate 185 is provided in a downstream bottom recess 183 forming the waterway downstream side of the bottom recess 160. The tilting weir plate 185 has a plate shape extending in the waterway width direction, and is configured so that its lower end face portion 186 can come into contact with a bottom 187 of the bottom recess 183 and its both side end portions 189, 189 come into contact with opposing side wall surface portions 190, 190 of the bottom recess 160. Furthermore, the tilting weir plate 185 is pivotally attached, for example by a hinge mechanism 192, to the bottom side of the bottom recess 183, so that it can be tilted within an angle range between a laid-down state 195A in which it overlaps with the bottom 193 on the downstream side of the waterway, and a raised state 195B in which it rises to a required angle, and by maintaining the tilting weir plate 185 in the raised state 195B, the water collection recess 10 is formed on the upstream side of the waterway from the tilting weir plate 185 in the raised state. Furthermore, the entire circumference of the peripheral portion 136 (Figure 26) of the lower end surface portion 6 is in abutment with the upper end peripheral portion 127 (Figure 25) of the water collection recess 10 over its entire circumference, so that the lower end surface portion 6 of the water intake movable weir 3 covers the upper end portion 10a of the water collection recess 10, the lower end open portion 7 is connected to the water collection recess 10, and a water collection portion 11 that collects the taken water is formed between the lower end surface portion 6 of the water intake movable weir 3 and the water collection recess 10.

[0128] The configuration of the bottom recess 160 and the configuration and installation of the tilting dam plate 185 will be described in more detail below. In this embodiment, the bottom recess 160 is recessed by digging into the waterway bottom 9 of the waterway as shown in Figures 25-26, and has a rectangular shape elongated in the extension direction of the waterway 2 in a plan view, with an open upper end. The bottom recess 160 is formed by pouring concrete, and as in the first embodiment, its inner surface and the peripheral portion of the upper end are covered and protected by a steel plate such as a stainless steel plate.

[0129] The bottom recess 160 has an inner wall surface portion 129 on the upstream side of the waterway as viewed in the extension direction of the waterway 2 and opposing side wall surfaces 130, 130 formed as vertical surfaces, and an inner wall surface portion 131 on the downstream side of the waterway is formed as an inclined surface portion 131a inclined obliquely upward toward the downstream side of the waterway from its lower end to its upper end. The upstream side of the bottom surface portion of the bottom recess 160 is formed as an upstream horizontal surface portion 196, and the downstream side of the waterway is formed as a downstream horizontal surface portion 199 connected to the upstream horizontal surface portion 196 via a step portion 175, and an accommodation recess 201 is formed with the downstream horizontal surface portion 199 as a bottom 200. When the tilting dam plate 185 is in a fallen state overlapping the bottom portion 200, the tilting dam plate 185 is accommodated in the accommodation recess 201. The inclination angle of the inclined surface portion 131a with respect to the horizontal plane is set to about 40 degrees.

[0130] The tilting weir plate 185 extends in the width direction of the waterway and has both side ends 189, 189 (Figure 25) that can abut against the opposing side wall portions 130, 130 of the bottom recess 160.The tilting weir plate 185 is made of, for example, stainless steel and has a rectangular plate shape with a thickness of, for example, 100 mm.

[0131] The tilting dam plate 185 has its lower end 188 pivoted to the step portion 175 of the lower end bottom recess 183 by the hinge mechanism 192 so that its lower end surface portion 186 abuts against the bottom portion 187, and can be tilted within an angle range between a laid-down state where it overlaps with the bottom portion 193 and a raised state shown by a solid line where it rises at a required angle from the downstream side of the waterway toward the upstream side of the waterway, as shown in Fig. 26. The rising angle is set to, for example, 70 degrees, and in the tilted raised state, the upper edge portion 203 of the tilting dam plate 185 is in close proximity to the upper end of the bottom recess 160.

[0132] The tilting dam plate 185 is held in the raised state by, for example, detachably engaging a first engaging member provided on the upper edge of the tilting dam plate 185 with a second engaging member provided on the downstream end 151 of the lower end surface portion 6. In this held state, the water collecting recess 10 is formed on the waterway upstream side of the tilting dam plate 185.

[0133] The entire circumference of the peripheral portion 136 (Fig. 26) of the lower end surface portion 6 of the movable water-intake weir 3 comes into contact with the entire circumference of the upper end peripheral portion 127 (Fig. 25) of the water collecting recess 10, thereby obtaining a state in which the lower end surface portion 6 covers the upper end portion 10a of the water collecting recess 10. In this embodiment, the "coming into contact" refers not only to the case in which the peripheral portion 136 comes into contact with the upper end edge portion 203 of the tilting weir plate 185 in the upright state in the portion where the tilting weir plate 185 in the upright state is present, but also to the case in which the peripheral portion 136 comes into close proximity to the upper end edge portion 203 as shown in Fig. 26. In this covered state, the lower end open portion 7 is connected to the water collection recess 10, and a water collection section 11 for collecting the taken water is formed between the lower end surface portion 6 of the water intake movable weir 3 and the water collection recess 10.

[0134] Here, the damming state is achieved by disposing a water-stop rubber 133 in the same manner as in Example 1. The abutment state of the lower end surface portion 6 of the movable water-intake weir 3 against the waterway bottom portion 9 may be such that there is almost no gap between them, or such that a small gap is formed between them. The small gap is formed naturally by the unevenness of the upper end peripheral portion 127, or, for example, as a gap between intermediate pieces interposed at a required interval between the upper end peripheral portion 127 and the peripheral portion 136 of the lower end surface portion 6. In this example, the abutment state is such that a small gap is formed between them.

[0135] When water is taken in only for a certain period of time for purposes such as melting snow, or when water collection is not required, such as in summer, the movable water-intake weir 3 is raised as shown by the dashed line in Fig. 1, and at this time, the engagement between the first engaging member and the second engaging member is automatically released. When the engagement is released in this manner, the tilting weir plate 185 automatically tilts due to its own weight, the water flow, and the water pressure, and reaches a tilted state overlapping the bottom 200 of the storage recess 201. When tilting in this manner, any trash accumulated in the storage recess 201 should be removed beforehand.

[0136] The water contained in the water collection section 11 flows into the water tank through a water supply pipe 144 from a water intake port 139 provided on one side wall surface portion 130a of the water collection recess 10, as described in Example 1, and is transported to a predetermined location through a water supply pipe by the operation of an underwater pump housed in the water tank, and is used as snow melting water, agricultural water, industrial water, etc.

[0137] FIG. 27 shows a state in which the movable water-intake weir 3 is lifted up slightly during a period when water intake is not required, for example, and the engaging weir plate 185 is overlapping the bottom portion 200.

[0138] In this state, the garbage that was blocked by the movable water intake dam 3 will flow into the water collection recess 10 with the flowing water, but the garbage that has flowed in will be efficiently removed by the flow velocity of the water in the channel.

[0139] In this case, in order to regulate the flow of the running water, the tilting dam plate 185 can be held in an inclined state with a rise angle slightly smaller than the above-mentioned raised state, for example, as shown by the dashed line in FIG.

[0140] Figures 28 to 30 show another embodiment of a water intake device 1 in which a bottom recess 160 recessed into the waterway bottom 9 forms the water collection recess 10 by holding the tiltable weir plate 185 in an upright position at a required angle, and a water collection section 11 for collecting the taken water is formed between the water collection recess 10 and the lower end surface portion 6, and the bottom recess 160, the water collection recess 10 and the water collection section 11 are provided in a waterway bottom 9A having a drop.

[0141] That is, the water collecting recess 10 constituting the water intake device 1 is provided on the upstream side of a bottom recess 160 recessed into an upper channel bottom 9a of a channel bottom 9A having a drop, the upper channel bottom 9a being connected to a lower channel bottom 9b via a step portion 175. The bottom recess 160 extends downstream of the channel beyond the downstream end portion 151 of the lower end surface portion 6, and the entire end portion 176 of the bottom recess 160 downstream of the channel 2 is opened toward the downstream side of the channel. The tilting weir plate 185 is provided in a downstream bottom recess 183 forming the downstream side of the bottom recess 160. The tilting weir plate 185 is in the form of a plate that extends in the width direction of the waterway and has both ends 206 , 206 that can abut against opposing side wall surfaces 207 , 207 of the bottom recess 160 .

[0142] The tilting weir plate 185 is pivotally attached at its lower end 188 to the bottom side of the bottom recess 183 by a hinge mechanism 192, so that it can be tilted within an angle range between a tilted state in which it overlaps with the bottom 200 on the downstream side of the waterway, and an upright state in which it rises to the required angle.

[0143] The angle of the rise is set to, for example, 70 degrees. As shown in Fig. 29, the tilting dam plate 185 is held in the raised state, so that the water collecting recess 10 is formed on the upstream side of the waterway from the tilting dam plate 185 in the raised state.

[0144] In this case, the abutment portion 211 between the lower end portion 188 of the tilting dam plate 185 and the bottom portion 187 of the bottom recess 160, and the abutment portion 213 between both ends 206, 206 of the tilting dam plate 185 and the opposing side wall portions 207, 207 are made watertight via gaskets.

[0145] The entire circumference of peripheral portion 136 (Fig. 29) of the lower end surface portion 6 comes into contact with the entire circumference of upper end peripheral portion 127 (Fig. 28) of the water collecting recess 10, thereby obtaining a state in which the lower end surface portion 6 covers the upper end portion 10a of the water collecting recess 10. In this covering state, the lower end open portion 7 communicates with the water collecting recess 10, and a water collecting portion 11 that collects the taken water is formed between the lower end surface portion 6 of the movable water intake weir 3 and the water collecting recess 10.

[0146] The advantage of a water intake device 1 having this configuration is that the presence of a step 175 at the bottom of the water channel can be utilized to open the entire downstream end 176 of the bottom recess 160 toward the downstream side of the water channel.

[0147] Therefore, as shown in Figure 30, when the tilting weir plate 185 is in a tilted state overlapping the bottom 187, when the movable water intake weir 3 rises and the blocked garbage flows into the bottom recess 160 with the flowing water, the garbage can be reliably discharged downstream of the waterway through the downstream end 176 of the bottom recess 160, which is in an entirely open state. In this embodiment, the inner surface of the bottom recess 160 is covered with a steel plate such as a stainless steel plate, so that the garbage can be discharged more smoothly with reduced friction. EXAMPLES

[0148] The present invention is by no means limited to the above-mentioned embodiment, and it goes without saying that various design modifications are possible within the scope of the claims. Examples thereof are as follows.

[0149] (1) In each of the above-mentioned embodiments, in order to more reliably prevent the inflow of debris into the water collection portion 11, a rubber plate (10 to 20 mm thick) made of soft butyl rubber or the like may be attached to the peripheral portion 136 of the lower end surface portion 6. This brings the entire circumference of the peripheral portion 136 of the lower end surface portion 6 into contact with the entire circumference of the upper end portion of the water collection recess 10 via the rubber plate. With this configuration, when the lower end surface portion 6 of the movable water-intake weir 3 covers the upper end portion 10a of the water collection recess 10, the peripheral portion 136 and the upper end peripheral portion 127 of the water collection recess 10 come into contact with each other without any gaps.

[0150] (2) The size and arrangement of the lower end opening portion 7 provided on the lower end surface portion 6 of the water intake movable weir 3, and the lower end opening portion 7 provided on the lower end surface portion main body 150, may be such that the water taken in by the water intake screen 36 can be released into the water collection portion 11 while ensuring the required strength of the lower end surface portion 6 and the lower end surface portion main body 150.

[0151] (3) As long as it does not significantly impair the strength of the main body portion 29 configured as the channel-shaped body, the lower end open portion 7 may be provided across the extended horizontal lower plate portion 27 and the horizontal lower plate portion 25, as shown by the dashed line in Figure 7, for example.

[0152] (4) The lifting device 116 can be constructed using various known means, such as a spindle system using a spindle whose lower end is connected to the upper end of the water-intake movable weir 3.

[0153] (5) The inner wall surface portion of the water collection recess 10 on the downstream side of the water channel when viewed in the extension direction of the water channel 2, and the inner wall surface portion of the bottom recess 160 on the downstream side of the water channel when viewed in the extension direction of the water channel may be vertical surfaces.

[0154] (6) The means for supplying the stored water in the water collecting section 11 to a predetermined location for use as snow melting, agricultural water, industrial water, etc. may be a means for supplying the stored water by gravity flow from the water intake, or a means for supplying the stored water to a predetermined location by a submersible pump installed in the water collecting recess 10. When a submersible pump is thus installed in the water collecting recess 10, the submersible pump may be configured to rise together with the water intake movable weir when the water intake movable weir rises.

[0155] (7) Figure 31 shows another embodiment of the water intake device 1 according to the present invention. The water intake device 1 is configured in the same manner as in Patent Document 1, with a water intake device section 219 integrally provided on a surface section 217 on the downstream side of the waterway of a movable weir section 216 that is interposed in the waterway and can move up and down. The movable weir section 216 and the water intake device section 219 form the water intake movable weir 3, with a bottom surface section 220 of the water intake device section 219 forming the lower end surface section 6, which is provided with a lower end open section 7, for example, of the same configuration as above, that communicates with the water collecting recess 10, and the water collecting section 11 is provided between the water collecting recess 10 and the lower end surface section 6.

[0156] (8) When the movable water intake weir 3 is configured to have the water intake box-shaped body 12, it can also be configured as follows.

[0157] 1) The main body 29 constituting the water intake box 3 may be configured so that the horizontal upper plate portion 22, the upright plate portion 20, the horizontal lower plate portion 25 and the extended horizontal lower plate portion 27 are formed continuously by bending a single metal plate. 2) The volume of the water intake box 12 is set as required taking into consideration the width of the waterway, the planned high water level of the waterway, the required amount of water intake, etc. 3) In the case where the strength of the intake box 12 against water pressure needs to be further improved due to the installation conditions of the water intake device 1 of the present invention, a ring-shaped reinforcing member 221 may be arranged inside the intake box 12 at the middle part in the longitudinal direction (waterway width direction) of the water intake box 12, or a plurality of ring-shaped reinforcing members 221 may be arranged at required intervals (e.g., 1 m intervals) in the longitudinal direction in consideration of the rigidity required for the intake box 12, to form a ring-shaped reinforcing portion 221, as shown in Fig. 32. The ring-shaped reinforcing member 221 is fixed to the inner surface of the intake box 12 by welding. When the ring-shaped reinforcing member 221 is arranged in this manner, in the portion where the screen surface 51 exists, the tip surface 222 of the ring-shaped reinforcing member 221 is formed as an inclined end surface 225 along the screen surface 51. When the annular reinforcing member 221 is positioned in this manner, it is preferable that the water intake screen 5 is positioned such that the water intake screen 5 is interrupted by the annular reinforcing member 221 so that the screen surface 51 and the inclined end surface 225 are flush with each other. 4) The upper and lower ends of the water intake screen 5 may be directly connected to the tip of the horizontal upper plate portion 22 and the tip of the extended horizontal lower plate portion 27 . [Explanation of symbols]

[0158] 1 Water intake device 2. Waterways 3 Water intake movable weir 5. Water Intake Screen 6 Lower end surface 7 Lower end open part 9 Waterway bottom 10. Water collection recess 11. Water collection section 12 Water intake box 17 Weir plate 19 Weir plate 20 Standing plate part 22 Horizontal upper plate section 25 Horizontal lower plate part 27 Extension horizontal lower plate part 29 Main body 32 Side plate 33 Side part 43 Channel-shaped body 61 Guide Wall 62 Guide Wall 116 Lifting Equipment 152 Cover plate part 160 Bottom recess 161 Liftable partition 175 Step 185 Tilt weir plate

Claims

1. This water intake device is equipped with a movable intake weir that is interposed in a waterway and can move up and down, and when the movable intake weir is lowered, it dams up the water in the waterway and takes in water, the movable intake weir has an intake screen that allows water that has overflowed its upper end to flow down and filters some of the flowing water so that it can be taken in at the bottom, the intake screen is installed in a state where it slopes downward towards the downstream of the waterway, and the lower end surface of the movable intake weir is provided with a lower end opening portion that releases the water taken in by the intake screen, A water collection recess is recessed into the bottom of the waterway, and when the movable water intake weir is lowered and installed at the bottom of the waterway in a damming state, the lower end surface portion covers the upper end of the water collection recess and the lower end open portion is connected to the water collection recess, and a water collection portion is formed between the water collection recess and the lower end surface portion for collecting water taken in by the water intake screen.

2. The movable water-intake weir is constructed with a water-intake box-shaped body, which is formed of a metal plate and has a main body having an upper end of an upright plate portion which has a horizontal upper plate portion which protrudes horizontally toward the downstream of the waterway, and a lower end of the upright plate portion which protrudes horizontally toward the downstream of the waterway, and an extended horizontal lower plate portion which is connected horizontally to the tip of the horizontal lower plate portion; The horizontal lower plate portion and the extended horizontal lower plate portion in a connected state constitute the lower end surface portion, The lower end open portion is provided on the extended horizontal lower plate portion or across the extended horizontal lower plate portion and the horizontal lower plate portion, The left and right open ends of the main body are closed with side panels, and the upper and lower ends of the water intake screen, which slopes downward toward the downstream of the waterway, allow the water that has overflowed the upper end of the upright plate section to flow down and filter a portion of the flowing water so that it can be taken in at the lower side, are directly or indirectly connected to the tip of the horizontal upper plate section and the tip of the extended horizontal lower plate section, and are configured so that the water taken in by the water intake screen is released at the lower end open section, 2. The water intake device according to claim 1, wherein the horizontal upper plate portion, the upright plate portion and the horizontal lower plate portion are formed as a single continuous piece by bending a single metal plate.

3. The lower end surface portion is formed by connecting a cover plate portion to a downstream end portion of a lower end surface portion main body having the lower end open portion, When the lower end surface portion covers the upper end portion of the water collecting recess, the lower end open portion communicates with the upstream portion of the water collecting recess, and the cover plate portion closes the upper end open portion of the downstream portion of the water collecting recess, 3. The water intake device according to claim 1, further comprising a water collecting portion formed between the water collecting recess and the lower end surface portion for collecting the taken water.

4. A water intake device as described in claim 3, characterized in that when the cover plate portion is viewed in a horizontal position, the upstream end of the cover plate portion on the waterway side is pivotally attached to the downstream end of the lower end surface portion main body so as to be rotatable in a vertical plane.

5. A bottom recess formed in the bottom of the waterway is partitioned in the waterway width direction by a vertically movable lifting partition plate, thereby forming the water collecting recess on the upstream side of the waterway from the lifting partition plate, The water intake device described in claim 1 or 2, characterized in that the lifting partition plate is lowered at the downstream end of the lower end surface portion of the water intake movable weir, and the water collection recess is formed by the lifting partition plate dividing the bottom recess in the width direction of the water channel as the lifting partition plate descends in conjunction with the lowering of the water intake movable weir, and the lower end surface portion of the water intake movable weir covers the upper end of the water collection recess, so that the lower end open portion is connected to the water collection recess, and the water collection portion that collects water taken in by the water intake screen is formed between the water collection recess and the lower end surface portion.

6. A bottom recess is provided in the bottom of the upper channel of a channel having a drop, the bottom of the lower channel being connected to the bottom of the upper channel via a step portion, the entire downstream end of the bottom recess is open toward the downstream side of the channel, and the bottom recess is partitioned in the width direction of the channel by a lift-up partition plate that can move up and down, thereby forming a water collection recess that is upstream of the closed lift-up partition plate. The water intake device described in claim 1 or 2, characterized in that the lifting partition plate is lowered at the downstream end of the lower end surface portion of the water intake movable weir, and the water collection recess is formed by the lifting partition plate dividing the bottom recess as the water intake movable weir descends, and the lower end surface portion of the water intake movable weir covers the upper end portion of the water collection recess, so that the lower end open portion is connected to the water collection recess, and a water collection portion that collects the taken water is formed between the water collection recess and the lower end surface portion.

7. 6. The water intake device according to claim 5, wherein the lifting partition plate is pivotally attached to the downstream end of the lower end surface portion so as to be rotatable within a vertical plane.

8. 7. The water intake device according to claim 6, wherein the lifting partition plate is pivotally attached to the downstream end of the lower end surface portion so as to be rotatable within a vertical plane.

9. the water collecting recess is provided on the upstream side of a bottom recess formed in the bottom of the waterway, and the bottom recess extends downstream of the waterway beyond the downstream end of the lower end surface portion of the movable water intake weir; a tilting dam plate is provided on the downstream side of the bottom recess in the waterway, the tilting dam plate has a plate shape extending in the waterway width direction, and is configured so that its lower end can be in contact with the bottom of the bottom recess and both side ends can be in contact with opposing side wall surfaces of the bottom recess; In addition, the tilting weir plate is pivotally attached at its lower end to the bottom side of the bottom recess, so that it can be tilted within an angle range between a tilted state in which it overlaps with the bottom on the downstream side of the waterway and a raised state in which it rises to a required angle, The tilting dam plate is held in the raised state, so that the water collecting recess is formed on the upstream side of the waterway from the tilting dam plate in the raised state, A water intake device as described in claim 1 or 2, characterized in that the lower end surface portion of the water intake movable weir covers the upper end portion of the water collection recess, thereby connecting the lower end open portion to the water collection recess, and forming the water collection portion that collects the taken water between the water collection recess and the lower end surface portion.

10. the water collection recess is provided on the upstream side of a bottom recess recessed into an upper section of a waterway bottom having a drop, the upper section being connected to a lower section of the waterway bottom via a step portion, the bottom recess extending downstream of the waterway beyond the downstream end of the lower end surface portion of the movable water intake weir, and the entire downstream end of the bottom recess is open towards the downstream side of the waterway, Further, a tilting dam plate is provided on the downstream side of the bottom recess, the tilting dam plate has a plate shape extending in the width direction of the waterway, and is configured so that its lower end can come into contact with the bottom of the bottom recess and both side ends can come into contact with the opposing side wall surfaces of the bottom recess, In addition, the tilting weir plate is pivotally attached at its lower end to the bottom side of the bottom recess, so that it can be tilted within an angle range between a tilted state in which it overlaps with the bottom on the downstream side of the waterway and a raised state in which it rises to a required angle, The tilting dam plate is held in the raised state, so that the water collecting recess is formed on the upstream side of the waterway from the tilting dam plate in the raised state, A water intake device as described in claim 1 or 2, characterized in that the lower end surface portion of the water intake movable weir covers the upper end portion of the water collection recess, thereby connecting the lower end open portion to the water collection recess, and forming the water collection portion that collects the taken water between the water collection recess and the lower end surface portion.

11. A water intake device as described in claim 1 or 2, characterized in that the inner wall surface portion of the water collection recess on the downstream side of the water channel when viewed in the extension direction of the water channel is inclined toward the downstream side of the water channel from its lower end to its upper end.

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