A weir installed in a waterway

Abstract

The present invention provides a weir to be installed in a waterway with an inclined inner surface and an inverted trapezoidal cross-section. [Solution] The weir plate 2 of the weir 1 is shaped like an inverted trapezoid, and a posture-holding member is attached to the weir plate 2. The posture-holding member allows the weir plate 2 to move up and down, and even if the water pressure of the water flowing through the channel acts on the weir plate 2, it can be restrained without being swept away.

Description

Technical Field

[0001] The present invention relates to a weir installed for blocking a waterway and introducing the flowing water into fields or the like.

Background Art

[0002] By blocking a waterway and raising the water level on the upstream side, it is possible to store water or facilitate water intake into a waterway for fields or the like. Generally, a weir is used as a means for blocking the waterway. FIG. 5 shows a cross-section of a general waterway (A) with a weir plate (B) installed. A suspension rod (C) extends upward from the weir plate (B), and a handle (D) is provided at the upper end of the suspension rod (C).

[0003] Therefore, the weir plate (B) can be lifted and lowered by grasping the handle (D). As shown in the figure, by lowering the weir plate (B), the water flowing in the waterway (A) can be blocked. Conversely, if the weir plate (B) is lifted, the water will flow along the waterway. By the way, guide grooves are provided on both inner side surfaces (E), (E) of the waterway (A), and both tip ends of the weir plate (B) can be fitted into the guide grooves and move up and down. The weir plate (B) is restrained by fitting both tip ends into the guide grooves and is arranged at a predetermined position without being washed away by water.

[0004] FIG. 6 shows a waterway (F) with an inverted trapezoidal cross-section in which the inner side surfaces (E), (E) are inclined, and an inverted trapezoidal weir plate (G) is arranged in the waterway (F). Guide grooves are provided on both inner side surfaces (E), (E) of the waterway (A) shown in FIG. 5 above. Both tip ends of the weir plate (B) are fitted into the guide grooves and are arranged at a predetermined position without being washed away by water. However, in the waterway (F) in which the inner side surfaces (G), (G) are inclined as shown in FIG. 6, when the weir plate (G) is lifted, both tip ends come out of the guide grooves on the inner side surfaces (G), (G). As a result, it cannot withstand the pressing force of the flowing water and is washed away.

[0005] Traditionally, various techniques have been known for regulating the flow of water by installing weirs in waterways. For example, in the "paddy field water level adjustment device" described in Japanese Patent Publication No. 2019-24401, a weir plate having a shape that conforms to the cross-sectional shape of the waterway C connecting the water source and the paddy field, and capable of blocking and opening the waterway C, is driven by a motor, and the water level of the paddy field is adjusted by a controller controlling the motor according to a signal from a water level sensor that detects the water level of the paddy field. This waterway has a vertical inner surface, as shown in Figure 5, and the weir plate is rectangular.

[0006] Furthermore, the "water intake structure and water intake method" related to Japanese Patent Publication No. 2012-41743 provides a water intake structure comprising a water intake port from which water flows out of a water source, a first water channel into which the water flowing out of the water intake port directly flows and guides the incoming water to the site of use, a second water channel provided adjacent to the first water channel on the side opposite to the side of the first water channel from which the water intake port is located, and a weir that separates the first water channel and the second water channel and is provided so as to intersect with the direction of outflow of water flowing out of the water intake port. The weir is configured such that when the outflow velocity of water from the water intake port is below a threshold, the water flowing into the first water channel from the water intake port does not flow into the second water channel, and when the outflow velocity of water from the water intake port exceeds the threshold, a portion of the water flowing into the first water channel from the water intake port flows into the second water channel.

[0007] As described above, it is well known that weirs are placed in waterways to draw water, but the inner surface of a waterway is always vertical. In the case of a waterway (he) with an inclined inner surface as shown in Figure 6, there are problems in installing the weir (to). [Patent Document 1] "Paddy field water level adjustment device" related to Japanese Patent Publication No. 2019-24401 [Patent Document 2] "Water intake structure and water intake method" related to Japanese Patent Publication No. 2012-41743 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0008] In a waterway with a vertically rising inner surface, it is easy to dam or allow water to flow by using a rectangular weir plate and raising and lowering it along a guide groove provided on the inner surface. However, in the case of a waterway with a sloping inner surface, when the installed weir plate is raised, a gap is created between it and the inner surface of the waterway, in addition to the space formed between it and the bottom of the waterway for water to flow through. There is no guide groove to hold the weir plate in place, and it cannot withstand the flow of water.

[0009] Furthermore, if a handle screwed onto a screw is rotated to raise or lower the weir plate, the plate will rotate and become unstable without a guide. The problem that this invention aims to solve is this issue, and it provides a weir to be installed in a waterway with an inclined inner surface, in which a weir plate is attached to the waterway, and when the weir plate is lifted to release water, the weir plate is not swept away by the water flow, and the orientation of the weir plate does not change, and the weir plate is held in a predetermined position, thereby controlling the flow of water. [Means for solving the problem]

[0010] This invention relates to a waterway with an inverted trapezoidal cross-section and an inclined inner surface. An inverted trapezoidal weir is installed to block the water flowing through this waterway. When the inverted trapezoidal weir is lowered and in contact with the bottom of the waterway, it makes contact with the inner surface without any gaps, effectively stopping the flow of water. The water blocked by the weir is primarily used for irrigating fields, but is not limited to that use. When water flows, the weir plate is lifted, creating a space between it and the bottom of the channel, but a gap is also created between it and the inner surface of the channel. The water in the channel flows through the space created between the weir plate and the bottom of the channel, and also through the gaps that occur between both ends of the weir plate and the inner surface.

[0011] While there is no problem with water flowing through the gap between both ends of the weir plate and the inner surface of the waterway, when the weir plate is lifted, the guide groove into which the ends of the weir plate were fitted disappears, creating a gap between it and the inner surface of the waterway, causing the weir plate to be swept away. Therefore, in this invention, a posture-holding member is attached to the weir plate, so that even if the weir plate is lifted and a gap is created between it and the inner surface, it will not be swept away and will be held in place.

[0012] The posture-holding member attached to the weir plate allows the weir plate to be raised and lowered in order to allow water to flow into the waterway or to block it, and even if it is lifted and comes out of the guide groove, it is structured to be held in place in a predetermined position without being washed away by the water hitting the lower end of the weir plate. Furthermore, when raising or lowering the weir plate, the handle screwed onto the screw that rises from the weir plate is designed so that its direction does not change even when rotated.

[0013] While the specific structure of the posture-holding member is not limited in this invention, the posture-holding member attached to the weir plate extends toward the inner surface of the waterway, and its tip engages with the inner surface, thereby enabling the weir plate to be raised and lowered without being swept away by the water. Furthermore, by attaching the posture-holding member to the inner surface of the waterway and configuring its tip to engage with the weir plate, the weir plate can be raised and lowered without being swept away by the water.

[0014] In other words, the posture-holding member does not restrict the raising and lowering movement of the weir plate, and can be fixed in place so as not to be swept away by the water pressure acting on it by the water flow when it is lifted and comes out of the guide groove. Here, the raising and lowering of the weir board can be operated by gripping a suspension rod extending upward from the weir board, or by extending a screw upward from the weir board and operating it with a handle; the specific means are not limited. When the weir board is lifted using a handle, it is held at a predetermined height; however, when it is lifted by hand via a suspension rod, it will fall if released. Therefore, appropriate means are taken to hold the weir board in place to prevent it from falling. [Effects of the Invention]

[0015] The water channel according to the present invention has an inclined inner surface, and the amount of flowing water can be appropriately adjusted by raising and lowering the installed weir plate. By lowering the weir plate to contact the bottom of the water channel, the flow can be stopped and water can be supplied from the branch pipe provided on the inner surface of the water channel to the fields etc. When water supply to the fields is not required, the flow of the water channel returns to the original state by raising the weir plate. And even if the weir plate is lifted and disengaged from the guide groove provided on the inner surface and a gap is generated, the weir plate will not be washed away by water by the attached posture holding member.

Brief Description of the Drawings

[0016] [Figure 1] This is an embodiment showing the weir according to the present invention, where (a) is a plan view and (b) is a front view respectively. [Figure 2] When the weir plate has descended and is in contact with the bottom surface of the water channel, (a) is a front view and (b) is a view taken in the direction of arrow A in (a). [Figure 3] When the weir plate is lifted and the protruding rod attached to it protrudes and the tip is fitted into the guide provided on the inner surface of the water channel and is constrained, (a) is a front view and (b) is a view taken in the direction of arrow B in (a). [Figure 4] This is another embodiment showing the weir according to the present invention, where (a) is the case where the weir plate has descended and is in contact with the bottom surface of the water channel, and (b) is the case where the weir plate has been lifted. [Figure 5] A conventional specific example in which a weir plate is arranged in a water channel with a vertically standing inner surface. [Figure 6] A conventional specific example in which a weir plate is arranged in a water channel with an inclined inner surface.

Modes for Carrying Out the Invention

[0017] Figs. 1(a) and (b) are embodiments showing the weir 1 of the present invention to which the posture holding member is attached, where (a) is a plan view and (b) is a front view respectively. 2 in the same figure shows the weir plate, 3, 3 show the upper protruding rods, and 4, 4 show the lower protruding rods. The weir plate 2 forms an inverted trapezoid and has an upper end surface 5, a lower end surface 6, and both side end surfaces 7, 7. Furthermore, four protruding rods 3,3,4,4 are provided on the front of the weir plate 2, and each of these protruding rods 3,3,4,4 slides in the longitudinal direction (horizontal direction), and its tip 8,8... can protrude from the side end faces 7,7 of the weir plate 2.

[0018] The protruding rods 3,3,4,4 are housed in cylinders 9,9 attached to the front of the weir plate 2, and coil springs 11,11 are housed in the spaces 10,10 provided between the two protruding rods 3,3 and the two protruding rods 4,4. Therefore, when the tips of the protruding rods 3,3,4,4 are pressed, they retract, and the coil springs 11,11 can be compressed. Conversely, when the pressing force is removed, the compressed coil springs extend and their tips protrude from the side end faces 7,7.

[0019] Figure 2 shows the weir 1 installed in the waterway 12, with the weir plate 2 lowered and its lower end surface 6 in contact with the bottom surface 13 of the waterway 12. Figure 3 shows the case where the weir plate 2 is lifted, creating a space 14 between it and the bottom surface 13, and simultaneously creating a gap 16 between the inner surface 15 of the waterway and the side end surface 7. As shown in Figure 2(b) from the perspective of arrow A in (a), when the weir plate 2 descends and its lower end surface 6 comes into contact with the bottom surface 13, the side ends of the weir plate 2 are sandwiched between the two guides 17, 17 provided on the inner surface 15 of the waterway.

[0020] Therefore, the water in the waterway 12 is blocked by the weir plate 2, and water can be supplied to fields and other areas from the branch pipes (not shown) installed on the inner surface 15. Furthermore, even if water pressure acts on the weir plate 2, the guides 17, 17 prevent the weir plate 2 from being swept away. In this case, the overhanging rods 3 and 4 attached to the front of the weir plate 2 are retracted by compressing the coil springs 11 and 11.

[0021] Figure 3 shows the case when the weir plate 2 is lifted, and Figure 3(b) shows the view from arrow B in Figure 3(a), where the protruding rods 3 and 4 protrude due to the spring force of the coil spring 11 and fit between the two guides 18, 18 which are located above the front side of the guides 17, 17. As the weir plate 2 rises, its tip detaches from the guides 17, 17, and instead, the cantilever rods 3, 4 are fitted between the guides 18, 18 provided on the inner surface 15 and are restrained. Therefore, the weir plate 2 can withstand the water pressure acting on it and will not be swept away. When the weir plate 2 is lifted, a space is formed between it and the bottom of the waterway 13, allowing water to flow. Even if the water level in the waterway 12 rises and hits the lower end of the weir plate 2, the weir plate 2 will not be swept away.

[0022] Furthermore, even if the weir plate 2 is configured to be raised and lowered by rotating a handle that is screwed onto a screw that rises from the weir plate 2, the orientation of the weir plate 2 does not change with the operation of the handle because the extension rods 3 and 4 are fitted onto the guides 18 and 18. On the other hand, when raising and lowering the weir plate 2 is done via suspension rods, recesses are provided on the inner surface 15 of the waterway (bottom of the guide groove) that the tips of the protruding overhanging rods 3 and 4 can engage with, so that the weir plate 2, once raised to a predetermined height, will not fall.

[0023] The posture-holding member shown in Figure 1 is an example where the protruding extension rods 3 and 4 are attached to the front of the weir plate 2. When the weir plate 2 is lifted, the extension rods protrude due to the spring force of the coil springs 11 and 11. The posture-holding member of the present invention is not limited to the above-mentioned overhanging rods 3 and 4, but is configured to allow the raising and lowering movement of the weir plate 2 and to withstand the water pressure caused by the water flow so as not to be swept away.

[0024] Figure 4 shows another embodiment of the posture-holding member. (a) shows the case when the weir plate 2 is lowered, and (b) shows the case when the weir plate 2 is raised. When the weir plate 2 is lowered and a large water pressure is acting due to the water flow, the side ends of the weir plate 2 are fitted into both guides 17, 17 provided on the inner surface 15 of the waterway. The weir plate 2 is lifted, creating a large space 14 between it and the bottom surface 13 of the waterway. As a result, the water flowing through the waterway 12 hardly hits the weir plate 2, but it can be supported by the link 19 extending from the inner surface 15 of the waterway 12.

[0025] The link 19 swings vertically around a fixed shaft 20 provided on the inner surface 15 of the waterway, and has a sliding shaft 21 at its tip. The weir plate 2 has a horizontally extending guide groove 22, and the sliding shaft 21 can slide along this guide groove 22. If the weir plate 2 is lifted, the link 19 swings upward, causing the slide shaft 21 at the tip of the link to move along the guide groove 22. Moreover, even if water pressure acts on the back of the weir plate 2, the link 19 cannot swing perpendicular to the plane of the paper, and the weir plate 2 will not be swept away.

[0026] Here, it is preferable that links 19,19 consist of two links, flanking the weir plate 2, so that they can withstand some water pressure acting on the weir plate 2. Furthermore, when the means for raising and lowering the weir plate 2 is configured to be via a suspension rod extending upward from the weir plate 2, a shallow recess is provided in the guide groove 21 to prevent the weir plate 2 from falling once it has been raised to a predetermined height. A portion of the slide shaft 21 is locked into this recess, thereby preventing the slide shaft 21 from sliding.

[0027] Furthermore, a weir plate 2 is installed to block the flow of water in the channel 12, but if the weir plate 2 is large, a large amount of water pressure will act on it due to the flow. Therefore, raising and lowering the weir plate 2 is hard work, but in the present invention, the weir plate 2 may be configured to reduce the water pressure acting on it by opening a part of it. For example, an opening plate can be pivotally supported on a part of the weir plate 2 so that it can rotate, and by pulling a string connected to the opening plate, it can rotate and open a part of the weir plate 2. [Explanation of Symbols]

[0028] 1 weir 2 Weir plate 3. Overhanging rod 4. Overhanging rod 5 Top surface 6 Lower end surface 7 Side end face 8 Tip 9 tubes 10 Space 11 Coil spring 12 waterways 13. Base 14 Space 15 Inner surface 16 gaps 17 Guide 18 Guide 19 links 20 Fixed axis 21 Slide axis 22 Guide grooves

Claims

1. A weir installed in a waterway having an inverted trapezoidal cross-section with an inclined inner surface, characterized in that the weir plate of the weir is inverted trapezoidal, a posture-holding member is attached to the weir plate, the posture-holding member allows the weir plate to move up and down, and can restrain the weir plate without being swept away even when water pressure from the water flowing in the waterway acts on it.

2. The above-mentioned posture-holding member is composed of an overhanging rod attached horizontally to the weir plate, and is capable of engaging with a guide or recess provided on the inner surface of the waterway, as described in claim 1, for installation in a waterway.

3. The above-mentioned posture-holding member has a link pivotally supported so as to be able to swing vertically around a fixed shaft provided on the inner surface of the waterway, and the tip of the link is provided with a sliding shaft, the sliding shaft being able to slide along a guide groove provided on the weir plate, as described in claim 1 for installation in a waterway.

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