JP3662051B2 - Undulating weir - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a fishway that dams rivers, drainage channels, etc., and allows fish (including salmon, mud, salmon, etc.) to move upstream (or downstream), and has a height of 15 m. It relates to undulating weirs that can be used as ordinary dams, sluices and valves from dam type that crosses.
[0002]
[Prior art]
Conventionally, weirs provided in rivers include gate weirs, overturn weirs, rubber weirs, etc., all of which have various problems. That is, in each of the weirs, in order to allow fish and the like to move upstream (or downstream), a fishway is provided so as to bypass the weir, or transported appropriately upstream (or downstream) by an elevator or the like. It was necessary to make a large-scale structure.
[0003]
The present inventor has invented a undulation weir to solve these problems and has already filed an application (Japanese Patent Laid-Open No. 6-180009). This undulating weir has one end edge on the support shaft provided at the other end edge portion of the upstream side weir plate and one end edge portion rotatably attached to the support shaft fixed in the width direction of the river bed. And a downstream side weir plate whose other edge is slid on the river bed, and driving means for raising or falling the both weir plates. With this configuration, fish and the like can move directly on the downstream side dam plate to the upstream side (or downstream side).
[0004]
[Problems to be solved by the invention]
However, in the undulation weir, it is necessary to maintain the slope of the downstream weir plate at 1/10 or less so that any fish can move smoothly toward the upstream side (or downstream side). For this reason, if the standing height of the upstream dam plate is increased in order to increase the amount of damming, the downstream dimension of the downstream dam plate increases accordingly, and it is put into practical use in terms of installation cost, occupied space, etc. May not be suitable.
[0005]
Moreover, if the flow rate decreases, the flow becomes such that fish or the like cannot move upstream on the upper surface of the downstream dam plate. That is, there arises a problem that a desired overflow height cannot be obtained. Conversely, if the desired overflow height is to be secured, it will not serve as a weir. Such a problem of overflow height also occurs when the flow state of the river changes and the flow rate is biased.
[0006]
In view of the above problems, an object of the present invention is to provide a hoisting weir that facilitates the movement of fish or the like upstream or downstream with a simple structure.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides an upstream dam plate having an upstream edge pivotably mounted in the width direction of the riverbed and a support shaft provided at the downstream edge of the upstream dam plate. In a undulation weir that is movably connected and has a downstream weir plate with a downstream edge sliding on the river bed, a concave groove inclined from the upstream edge to the downstream edge of the downstream weir plate with respect to the flow-down direction Forming a fishway consisting ofThe downstream dam plate is provided with a lid that closes the upper opening of the concave groove from the upstream side and can adjust the closing dimension thereof.Is.
[0008]
With this configuration, the slope of the fishway can be made smaller than that of the downstream dam plate, and regardless of the standing position of both dam plates, fish etc. to the upstream side (or downstream side) Including) can be moved. In addition, since the fishway is provided directly on the downstream side weir plate, the length of the fishway can be minimized and the movement of fish etc. to the upstream side (or downstream side) can be performed smoothly. It is. Furthermore, fish and the like are not easily subjected to running water resistance even if the groove is not so deep, and are appropriately protected from external enemies such as catching. In addition, the adjustment of the closing dimension of the lid body may be configured such that a long hole is formed in the lid body and screwed to the downstream dam plate through the long hole, or a plurality of the lid body and the downstream dam plate are arranged. The connecting rod may be pivotably connected, and the operation portion extended to the riverbank side may be operated in the river width direction to change the rotational position of the connecting rod.
[0009]
In order to achieve the above object, the present invention provides an upstream dam plate having an upstream edge pivotably mounted in the width direction of the riverbed and a support shaft provided at the downstream edge of the upstream dam plate. In a undulation weir that is movably connected and has a downstream dam that has a downstream edge that slides on the river bed, and that is inclined with respect to the flow-down direction from the upstream edge to the downstream edge of the downstream dam. The upstream dam plate is attached with an auxiliary plate capable of adjusting the projecting dimension obliquely upward on the downstream side, except for the upstream position of the upstream end portion and the downstream end portion of the fish passage. It is.
[0010]
With this configuration, by adjusting the protruding dimension of the auxiliary plate, it is possible to stop running water at a position higher than the standing position of both dam plates. In this case, since the auxiliary plate is not provided at the most upstream position of the fishway, the fish that has gone up the fishway can smoothly move to the upstream side. In particular, since the inside of the fishway corresponds to a downstream region where the flow is slow, it is convenient for the fish to move upstream. Even when the amount of water decreases, water flows through the fishway of the downstream dam plate, so that the temperature of the downstream dam plate does not rise excessively due to solar radiation, and deformation of the downstream dam plate can be prevented. In addition, the amount of water in the most downstream area is larger than that in other parts, and the water splash increases, so that fish are more likely to collect in response to this sound. Furthermore, as the amount of water increases, the fish easily move upstream.
[0011]
In order to achieve the above object, the present invention provides an upstream dam plate having an upstream edge pivotably mounted in the width direction of the riverbed and a support shaft provided at the downstream edge of the upstream dam plate. In a undulation weir that is movably connected and has a downstream dam that has a downstream edge that slides on the river bed, and that is inclined with respect to the flow-down direction from the upstream edge to the downstream edge of the downstream dam. And the both dam plates include an automatic auxiliary auxiliary plate composed of an upstream auxiliary dam plate, a downstream auxiliary dam plate, and auxiliary drive means having substantially the same configuration capable of adjusting the water level further upstream of the damming position. An undulating weir is provided.
[0012]
With this configuration, not only can the water level be adjusted in a wider range than when the auxiliary plate is provided, but also the amount of water flowing down in the fishway can be easily adjusted.
[0013]
In order to achieve the above object, the present invention provides an upstream side dam plate having one end edge rotatably attached to a support shaft fixed in the width direction of the river bed, and the other end side edge portion of the upstream side dam plate A plurality of undulation weirs with one end edge pivotably connected to the support shaft provided on the other side and a downstream dam plate whose other end edge slides along the river bed are arranged side by side in the river width direction. When a guide wall is erected from the river bed so that no gap is created between them, and each undulation weir has the same erection position, a fishway located on the same straight line is formed, and each undulation is formed on the guide wall. Even if the standing position of the weir is changed, if the fishway is located on the same straight line, an escape recess that communicates them is formed to flow down from the upstream side to the downstream side at the fishway and the escape recess. It is.
[0014]
With this configuration, even when the width dimension of the river is large, it is possible to cope with the undulation weir and to set the slope of the fishway sufficiently small. In addition, since both the dam plates are guided by the guide walls, the strength is excellent, and even if the standing positions of the both dam plates are slightly changed, the fishway communicates appropriately with the relief recesses formed in the guide walls.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0031]
(First Embodiment) FIG. 1 shows a undulation weir 1 according to a first embodiment, and is substantially the same as a undulation weir according to a conventional example except for a fishway 11 formed on a downstream dam plate 4 described below. It is a configuration. That is, the undulating weir 1 includes an upstream weir plate 3 provided on a river bed 2 of concrete or the like with an upstream edge pivotable about a support shaft 2a, and a support provided at the downstream edge of the upstream weir plate 3. An upstream edge is pivotally connected around a shaft 3a, and a downstream side dam plate 4 whose downstream edge slides on the river bed 2 and drive means 5 for raising or falling the both dam plates 3 and 4 are provided. It is a thing.
[0032]
The both dam plates 3 and 4 include a steel plate subjected to rust prevention treatment, a reinforced plastic board, a sandwich structure plate in which resin plates are arranged on both sides of the steel plate, and a plurality of ribs provided by arranging steel plates at predetermined intervals. Can be used, and a sealing member 6 made of waterproof rubber, plastic or the like (not shown on the front edge in the figure) is integrated on both sides. .
[0033]
On both banks of the river where both the weir plates 3 and 4 are disposed, side walls 7 (not shown in the figure in the figure) are formed continuously from the river bed 2 with concrete or the like, and the sealing member 6 slides. A metal 8 is integrated with the contacting portion. Examples of materials that can be used for the metal 8 include stainless steel (SUS304) and carbon steel (SS400). Of course, when carbon steel is used, its surface needs to be rust-prevented by painting.
[0034]
Further, the driving means 5 can adopt a mechanism such as rotating the upstream side weir plate 3 by a cylinder or pulling the downstream edge of the downstream side weir plate 4 via a wire or the like by driving a motor (this embodiment). In this embodiment, a cylinder is used), and an appropriate number may be arranged according to the weight of the hoisting weir 1 and the like. However, when the hoisting weir 1 is formed at a low cost, the driving means 5 is not necessarily required, and a structure that can be maintained in a predetermined standing position is provided so that the standing weir 1 does not fall down, and a crane or the like is provided if necessary. The standing position can be changed by the above. As a structure for maintaining the standing position of the hoisting weir 1, for example, both ends of the support shaft 3 a are fixed to both banks with a wire or the like, or the downstream edge of the downstream weir plate 4 is appropriately erected from the river bed 2 A structure that is supported by the supported support member can be employed.
[0035]
A groove 9 is formed in the river bed 2 on which the downstream edge of the downstream side weir plate 4 slides. The groove portion 9 is provided in the vicinity of both banks of a river where fish and the like (including sharks, mud sharks, sharks, and the like) move frequently. And, regardless of the sliding position of the downstream edge of the downstream side weir plate 4, it communicates with the concave groove 12 of the downstream side weir plate 4 described below. However, it goes without saying that the groove 9 can be provided in various places such as the central part of the river according to the difference or change in the flowing water state.
A groove 9 is formed in the river bed 2 on which the downstream edge of the downstream side weir plate 4 slides. The groove portion 9 is provided in the vicinity of both banks of a river where fish and the like (including sharks, mud sharks, sharks, and the like) move frequently. And, regardless of the sliding position of the downstream edge of the downstream side weir plate 4, it communicates with the concave groove 12 of the downstream side weir plate 4 described below. However, it goes without saying that the groove 9 can be provided in various places such as the central part of the river according to the difference or change in the flowing water state.
[0036]
As shown in FIG. 2, it is preferable that a sliding contact member 10 slidably contacting the inside of the groove portion 9 is provided on the downstream edge of the downstream side weir plate 4. The sliding contact member 10 can be made of, for example, a plurality of elastic string-like materials, a hard rod-like body, etc., and can be used for sand, gravel, etc. By removing the moss and making it easy to generate moss, an environment in which fish and the like prefer to move is formed.
[0037]
A fishway 11 is formed in the downstream dam plate 4. The fishway 11 includes a concave groove 12 formed in the downstream dam plate 4 and a lid 13 that covers the concave groove 12. The concave groove 12 is composed of an inclined portion 14 provided so as to be inclined with respect to the flow-down direction from the upstream edge to the downstream edge of the downstream side weir plate 4 and a linear portion 15 provided along the flow-down direction at the downstream end portion, It has a semicircular cross section and is formed by pressing or the like. The inclination angle of the inclined portion 14 of the concave groove 12 is set to such a value that the gradient of the fishway 11 is 1/10 or less even when both the weir plates 3 and 4 are raised to the maximum standing position.
[0038]
The lid body 13 is attached so as to cover the concave groove 12 from the upstream side of the downstream dam plate 4. Specifically, a long hole 13a is formed in the lid body 13 in the width direction, and is screwed to the downstream dam plate 4 through the long hole 13a. Therefore, by changing the position of the screw with respect to the long hole 13a, the projecting (closing) dimension of the lid 13 covering the concave groove 12 can be adjusted. Accordingly, when the light is introduced into the concave groove 12 (this is effective because fish often dislikes movement to a dark place), or in order to prevent dust and the like from accumulating, the lid 13 is used. What is necessary is just to reduce a protrusion dimension, and when protecting from an external enemy (for example, a bird etc.), what is necessary is just to increase an obstruction | occlusion dimension (for example, it is good also as a full closure). In this case, if the lid 13 is made of a translucent material such as a transparent acrylic plate, the problem of insufficient light quantity in the fishway 11 does not occur. The lid 13 is not necessarily required, and the flow in the groove 12 is greatly affected by the flowing water on the upper surface of the downstream weir plate 4 depending on various conditions such as the installation location of the hoisting weir 1 and the flow velocity. If not, it is unnecessary.
[0039]
The undulation weir 1 including the fishway 11 having the above-described configuration is provided at a plurality of locations in the river and sequentially dams running water. And the standing position of both dam boards 3 and 4 is changed and used according to the water quantity of a river. It is preferable that the standing positions of the two weir plates 3 and 4 are slightly lower than the water level. In the undulation weir 1 used in this way, fish can move upstream as follows.
[0040]
That is, the fish mainly moves toward the upstream side (or downstream side) in the groove portion 9 near both banks. In the vicinity of both banks, the amount of water is large and the flow rate is slower than the other parts because of the groove 9, so that the fish easily move. Further, even if the water level of the river is lowered, a predetermined amount of water is guaranteed by the groove portion 9, and the upstream flowing water also flows from the concave groove 12 formed in the downstream dam plate 4, so that the movement of the fish is hindered. It will never be done.
[0041]
In this way, the fish that has reached the undulating weir 1 has a sufficiently high water level, the standing position of both dam plates 3 and 4 is low, and the slope of the downstream dam plate 4 is 1/10 or less. Not only the fishway 11 of the side dam plate 4 but also other parts can be passed toward the upstream side (or downstream side).
[0042]
On the other hand, when the water level is low or the standing positions of both dam plates 3 and 4 are high and the gradient of the downstream dam plate 4 exceeds 1/10, the inclined portion 14 can be moved upstream. it can. In this case, the fish that has moved from the downstream side can move to the inclined portion 14 after entering the straight portion 15 formed in the same direction as the moving direction in the river bed 2. Moreover, since the fishway 11 has a configuration in which the concave groove 12 is covered with the lid 13, the flow velocity is slow and the upstream movement is easy.
[0043]
In the first embodiment, as shown in FIG. 3, the lid 13 is connected to a plurality of connecting rods 16 provided rotatably on the upstream side of the concave groove 12 of the downstream side weir plate 4. The projecting dimension of the lid 13 with respect to the concave groove 12 may be adjustable by changing the rotational position of the connecting rods 16. According to this, the operating member 17 is connected to the lid 13 itself, and the projecting dimension with respect to the concave groove 12 can be adjusted from the river shore, and the adjustment work is easier than that using the long hole 13a. It is.
[0044]
Although the concave groove 12 is semicircular, it may be formed in various shapes such as a quadrangle and an inverted triangle. In short, a predetermined water level is set in the concave groove 12 regardless of the standing position of the undulating weir 1. The shape can be maintained. However, it is preferable to adopt a configuration in which the shape changes smoothly, such as semicircular, in that dust and the like are less likely to collect and water can flow smoothly.
[0045]
Further, although the straight line portion 15 is formed only at the downstream end portion of the concave groove 12, it may be formed only at the upstream end portion or at both end portions. The reason why the straight line portion 15 is also formed at the upstream end portion is to facilitate movement of the fish to the downstream side via the fishway 11. That is, when the slope of the downstream side weir plate 4 is large (when it exceeds 1/10), the movement speed of the fish on the downstream side weir plate 4 is high and the risk of getting damaged increases. By providing it at the end, it is possible to make it easy to enter the fishway 11 and to move it smoothly without worrying about being damaged downstream.
[0046]
Further, if a plurality of protrusions are provided on the bottom surface of the concave groove 12 and the running water is made to flow smoothly along the protrusions, fish and the like can move smoothly toward the upstream side.
[0047]
As said protrusion part, what consists of innumerable protrusion 18a shown to Fig.4 (a), what consists of several protrusion 18b arranged in parallel in the flow-down direction shown in FIG.4 (b), figure Various shapes such as a plurality of protrusions 18c arranged orthogonal to the flow-down direction shown in 4 (c) can be applied. And each said protrusion part 18a, 18b, 18c sprays and adheres a particle | grain to the inner surface of the fishway 11, integrates a board | plate material by welding etc., forms the board | plate material which comprises the fishway 11 by press work, What is necessary is just to form by various methods, such as sticking the sheet | seat which has a protrusion part.
[0048]
In addition, as shown in FIG. 15, the protruding portion may be configured by a block 100 having a hollow space 100 a and a plurality of through holes 100 b. The block 100 can be formed of various materials having high strength such as concrete and reinforced plastic. The block 100 may be fixed or placed not only on the fishway 11 but also on the river bed 2 formed of concrete or the like. However, it is preferable to fix so that it will not flow when the water increases. Also, the projecting direction and length of the block 100 may be set freely. In short, as long as it can form a region where fish and the like can be prevented from flowing on the downstream side of the block 100 in a more natural state. Good. It is preferable to place seeds such as aquatic plants in the hollow space 100a. The grown aquatic plants and the like extend out of the block 100 through the through hole 100b, and are not simply peeled off and flown away from the surface of the block, and can always maintain a state close to nature. . Further, in the through hole 100b, a metal ring or the like is fitted into the through hole 100b, or a protective frame such as an iron plate is provided on the outer surface so that the block 100 is not damaged by cracks or the like due to growth of aquatic plants or the like. May be provided.
[0049]
Moreover, although the said fishway 11 was comprised with the ditch | groove 12 and the cover body 13, you may make it comprise with a grooved member, such as a cylindrical body and a cross-sectional U shape, or a cross-sectional U shape. These may be directly fixed to the downstream side weir plate 4 by welding, bolting, or the like, but are preferably connected to the upstream edge of the downstream side weir plate 4 so as to be rotatable. According to this, irrespective of the gradient of the downstream dam plate 4, the gradient of the fishway 11 can be freely adjusted. It is preferable that the cylindrical body and the groove member have a shape that smoothly changes in the flow-down direction so that flowing water flows smoothly. The cylindrical body and the groove-shaped part may be bent by forming a bellows part at an intermediate part, or may be configured to have flexibility as a whole. In this case, the cylindrical body or the like may be placed at an arbitrary position. Need to be able to position. In the case of a cylindrical body, when it is made of a transparent material so that light can be taken into the inside, or a plurality of through holes are drilled, the flowing water on the upper surface of the downstream side weir plate 4 or when this flowing water is small Preferably, air (oxygen) can be taken into the interior.
[0050]
(Second Embodiment) FIG. 5 shows an undulating weir 20 according to a second embodiment. This undulating dam 20 is common to the first embodiment in that it includes an upstream dam plate 21, a downstream dam plate 22, and a driving means 23, but the fishway 24 is on the downstream side. It is different in that it is formed by two concave grooves 25a and 25b having different inclination directions, and the intermediate portions of the concave grooves 25a and 25b intersect so as to communicate with each other.
[0051]
The downstream ends of the concave grooves 25a and 25b are located on both sides of the river. This is because the flow velocity is usually slow near both banks of the river, and the fish prefers the slow flow velocity portion to move upstream, so that the fish can easily enter the fishway 24.
[0052]
According to the undulation weir 20 having the above-described structure, the downstream end of the fishway 24 is positioned near both banks where the fish moving upstream in the river preferably pass, so that the fish can easily enter the fishway 24. It is possible to adopt a configuration in which the fishway 24 can be effectively used.
[0053]
In the undulation weir 20 according to the second embodiment, the fishway 24 is provided with two concave grooves 25a and 25b so that they are communicated with each other in the middle portion. However, the fishway 24 may be further branched. . For example, when the water level becomes low, it often flows down only at the central part of the river, so it is necessary to open the downstream end of the fishway 24 at that position (indicated by a two-dot chain line in the figure). ). Similarly to the first embodiment, a linear portion is formed at the end of the groove 25a or 25b, a lid is provided on the groove 25a or 25b, or a plurality of inner surfaces of the groove 25a or 25b are provided. Of course, it is also possible to provide a protruding portion, or to arrange a cylindrical body in the concave grooves 25a, 25b. Furthermore, each of the concave grooves 25a, 25b may be changed in width, depth, etc. according to the type of fish to be moved.
[0054]
(Third Embodiment) FIG. 6 shows an undulating weir 30 according to a third embodiment. This undulating dam 30 is common to the first and second embodiments in that it includes an upstream dam plate 31, a downstream dam plate 32, and a drive means 33. It is different in that a staying portion 35 that is bent at an intermediate portion and in which the fish can rest is formed at the bent portion.
[0055]
According to the undulating dam 30, the rising position is high and the width of the river (downstream dam plate 3) is narrow, so that in the configuration as in each of the above embodiments, the gradient of the fishway with respect to the downstream direction is reduced to 1/10. Even if it cannot be done below, the fish can move upstream (or downstream) by bending the middle part of the fishway 34 and suppressing the slopes of the inclined parts 34a and 34b as described above. .
[0056]
In addition, a stay 35 is formed in the fish passage 34, where water is stagnant to some extent, so that the fish is not washed away. Therefore, the fish that has risen up the inclined portion 34a of the fishway 34 only needs to rest at the staying portion 35 and change the direction, and then go up the inclined portion 34b of the fishway 34, and smoothly go upstream. It is movable.
[0057]
In addition, although the retention part 35 was formed in the said fishway 34, the full length of the fishway 34 is not so long, and when the fish can fully move upstream, it is unnecessary. In addition, the fishway 34 is not necessarily formed linearly, and may be formed to meander as long as a predetermined gradient (for example, a gradient of 1/10 or less) can be maintained. is there.
[0058]
Further, the staying portion 35 is not necessarily provided at the bent portion of the fishway 34. When the inclined portions 34a and 34b are long or when the inclined portions 34a and 34b are short, the fish that cannot go up moves. In that case, of course, the stay part 35 may be formed in the middle of the inclined parts 34a, 34b.
[0059]
(Fourth Embodiment) FIG. 7 shows an undulating weir 40 according to a fourth embodiment. This undulating weir 40 is common to the above-described embodiments in that it includes a downstream dam plate 41, an upstream dam plate 42, and a driving means 43, but on the surface of the downstream dam plate 3. The difference is that a partition wall 45 constituting the fishway 44 is provided so as to be rotatable about a support shaft 45a.
[0060]
The partition wall 45 is supported by a plurality of ribs 46 (see FIG. 8) with its downstream surface projecting from the downstream weir plate 3 in a state where the undulating weir 40 is erected, and the downstream weir on the upstream side. A groove portion 47 can be formed with the surface of the plate 42. Then, in a state where the standing weir 40 is turned over flatly, the partition wall 45 is rotated to the opposite side with respect to the rib 46 so as not to protrude from the downstream side weir plate 42. Thereby, the partition wall 45 does not obstruct the flow down, and a smooth flow is always ensured.
[0061]
The partition wall 45 has a structure in which the grooved portion 47 can be formed between the partition wall 45 and the downstream weir plate 43 by supporting the downstream surface with the rib 46, but the rib 46 is provided. In addition, various configurations such as enabling the partition wall 45 to be rotated by a cylinder (not shown) can be employed. That is, when the groove-shaped portion 47 is used as the fishway 44, any structure that can withstand a predetermined water pressure and can be folded may be used. It is further preferable to form a recess (not shown) in the downstream dam plate 43 so as to be substantially flush with the downstream dam plate 43 when folded.
[0062]
The partition wall 45 is not necessarily configured to be rotatable, and may be integrated with the downstream weir plate 43 by welding or the like. In this case, for example, if it is necessary to change the position of the fishway due to changes in the flow of rivers, it is relatively easy to cut a part of the partition wall 45 and connect a new partition wall 45. can do.
[0063]
(Fifth Embodiment) FIG. 9 shows an undulating weir 50 according to a fifth embodiment. This undulating weir 50 is common to the above embodiments in that it includes an upstream side weir plate 51, a downstream side weir plate 52, and a driving means 53. It is different in that a plurality of auxiliary plates 54 made of steel plates or the like are screwed and fixed along the edges via elongated holes 54a.
[0064]
Each auxiliary plate 54 is fixed so as to protrude obliquely upward from the upstream side weir plate 51 toward the downstream side, and the protruding dimension can be adjusted by using the elongated hole 54a. The auxiliary plate 54 has zero projecting dimension from the upstream side weir plate 52 at one place or a plurality of places as necessary. Specifically, in the portion where the upstream opening of the fishway 55 is located, the protruding dimension of the auxiliary plate 54 is made zero for the movement of the fish (in FIG. 9, the auxiliary plate 54 is not provided at this position. ). In addition, the auxiliary plate 54 may be composed of a single piece, but taking into account the change in the flow of water over time (when the water flowing in the center flows near one shore due to changes in topography, etc.) If so, it is possible to respond more flexibly to a configuration with a plurality of sheets.
[0065]
According to the auxiliary plate 54, the damming water level can be adjusted by adjusting the protruding dimension from the upstream weir plate 51, which is simpler than the case where the rising height of the hoisting weir 50 is adjusted by the driving means 53. It can correspond to. Moreover, much energy is not required unlike the case where the standing weir 50 is raised against the water pressure. However, since the auxiliary plate 54 has a structure that is only screwed to the upstream dam plate 51, there is a limit to the amount of water that can be dammed, and only when the rising level of the water level is within 20 cm, for example. Is available. Therefore, if the rising dimension of the water level exceeds 20 cm, it is necessary to cope by adjusting the standing position of the hoisting weir 50.
[0066]
As shown in FIG. 10, it is preferable that the auxiliary plate 54 has a projecting dimension of zero or not provided at the upstream position of the downstream end of the fishway 55. That is, by preventing the auxiliary plate 54 from projecting at this position, a larger amount of running water can be supplied to the downstream end of the fishway 55 than in other portions. At the downstream end of the fishway 55, a sound based on splashing or the like is generated, and the fish collect in response to this sound, and the water amount increases, so that the fishway 55 can easily enter. In the fifth embodiment, the same fishway as that used in each of the above embodiments can be used.
[0067]
(Sixth Embodiment) FIG. 11 shows an undulating weir 60 according to a sixth embodiment. This undulating weir 60 is common to the above-described embodiments in that it includes an upstream weir plate 61, a downstream weir plate 62, and a driving means 63. It is different in that it has a flat portion 64 formed by being bent inward in the vicinity of a support shaft 61a that is a connecting portion with the upstream side weir plate 61.
[0068]
Both edges of the flat portion 64 are chamfered or arcuate so as not to be angular. As a result, the gradient changes smoothly, so that the fish can move smoothly upstream (or downstream) without being damaged. Further, the flat portion 64 improves the mechanical strength of the entire undulation weir and, as described above, when the fishway is formed of a concave groove, the connection structure with the upstream side is simplified (in FIG. You only need to form a ditch as shown by the dashed line.) Moreover, the flat portion 64 can be used as a sidewalk or the like when the water level is low, and it is convenient to move the flat portion 64 when a repair location occurs. The flat portion 64 is not limited to the downstream dam plate 62 but may be formed on the upstream dam plate 61.
[0069]
(Seventh Embodiment) FIG. 12 shows an undulating weir 70 according to a seventh embodiment. This undulating weir 70 is common to the above embodiments in that it includes an upstream dam plate 71, a downstream dam plate 72, and a driving means 73. This is different in that an auxiliary undulating weir 74 is provided.
[0070]
The auxiliary undulation dam 74 includes an upstream side auxiliary dam plate 75, a downstream side auxiliary dam plate 76, and auxiliary drive means 77. The upstream edge of the upstream auxiliary dam plate 75 is rotatably connected to a support shaft 71 a that connects the dam plates 71 and 72. The upstream edge of the downstream auxiliary dam plate 76 is rotatably connected to the downstream edge of the upstream auxiliary dam plate 75 around the support shaft 75a. The downstream edge of the downstream auxiliary dam plate 76 slides on the upper surface of the downstream dam plate 76, and the standing position of the undulating weir 70 is adjusted by auxiliary drive means 77 such as a cylinder connected thereto. .
[0071]
In the undulation weir with the above-described configuration, if the change in the water level is small, it can be dealt with by adjusting the standing positions of the auxiliary dam plates 75 and 76. For example, the auxiliary undulation weir 74 may be covered to the maximum extent by taking statistics of river level changes over the course of a year. The auxiliary hoisting weir 74 requires less energy than the case where the standing position of the hoisting weir 70 is adjusted, and can respond quickly. That is, since the water pressure acting on the upstream weir plate 71 of the undulating weir 70 is large, there are restrictions in changing the standing position.
[0072]
When the both dam plates 71 and 72 are flatly overturned, the auxiliary dam plates 75 and 76 do not hinder the flow by being similarly flatly overturned. Further, the upstream edge of the upstream auxiliary dam plate 75 is provided on the support shaft 71a. However, a separate support shaft (not shown) is provided on other portions, for example, the upstream dam plate 71 and the downstream dam plate 72. Of course, it may be fixed and connected to this support shaft.
[0073]
(Eighth Embodiment) FIG. 13 shows an undulating weir 80 according to an eighth embodiment. The undulating weir 80 is common to the above-described embodiments in that it includes an upstream weir plate 81, a downstream weir plate 82, and a driving means 83. An internal space 87 formed by the inner surfaces of the two weir plates 81 and 82 and the upper surface of the river bed 86 is provided by opening and closing means 84a and 84b and through holes 85a and 85b through which fish and the like can move. It is different in that running water can be introduced inside.
[0074]
As the opening / closing means 84a, 84b, a valve, a slide type plate material or the like can be used (the opening / closing means 84a, 84b shown in FIG. 13 are constituted by slide type opening / closing plates. The through holes 85a and 85b are preferably closed on the upstream side in the flow direction, and the open / close plates and the weir plates 81 and 82 are preferably watertight with packing or the like. Further, the number of the through holes 85a and 85b may be any number, but when the number of the through holes 85a provided in the upstream side weir plate 81 is increased, the downstream side weir plate 82 has a relationship with water pressure. A structure having the same high strength as the upstream weir plate 81 is required.
[0075]
In the undulating weir 80 having such a configuration, first, the through hole 85 a of the upstream side weir plate 81 is opened, and the upstream running water is taken into the internal space 87. Then, the through hole 85a of the upstream side weir plate 81 is once closed, and the through hole 85b of the downstream side weir plate 82 is opened. As a result, the fish on the downstream side can move into the internal space 87. Once the fish or the like has moved into the internal space 87, the fish or the like can be moved upstream by once closing the through hole 85b of the downstream dam plate 82 and opening the through hole 85a of the upstream dam plate 81. And
[0076]
In this case, it is preferable that the opening / closing means 84a and 84b are configured to automatically open and close the through holes 85a and 85b in a predetermined time period in the order. Further, instead of drilling the through hole 85b in the downstream dam plate 82, a groove or the like that connects the internal space 87 and the downstream side may be formed in the river bed 86 where the downstream edge slides. . Further, the opening / closing means 84a and 84b and the through holes 85a and 85b are not only used as fishways, but are also used for water discharge when the water pressure is high due to the high upstream water level and the standing position of the undulating weir 80 cannot be changed. May be. That is, by opening both through-holes 85a and 85b, the water that has been blocked on the upstream side is caused to flow downstream to lower the water level, and then the standing position of the undulating weir 80 is changed.
[0077]
(Ninth Embodiment) FIG. 14 shows an undulating weir 90 according to a ninth embodiment. The undulation weir 90 is formed by arranging the undulation weirs 91a and 91b similar to those described in the above embodiments in the width direction of the river. The provided guide wall 93 is located. Each undulation dam 91a, 91b includes upstream dam plates 94a, 94b, downstream dam plates 95a, 95b and driving means 96a, 96b, and is recessed in the downstream dam plates 94a, 94b of the undulation weirs 91a, 91b. Grooves 97a and 97b are formed, respectively. One end of the groove 97a formed in the downstream weir plate 95a is located at the downstream edge, and the other end is located at the side edge. On the other hand, one end of the concave groove 97b formed in the downstream side weir plate 95b is located on the side edge, and the other end is located on the upstream edge. The guide wall 93 is formed with a relief recess 98 that communicates with the both concave grooves 97a and 97b. The relief recess 98 is formed to have a large width and depth so that the concave grooves 97a and 97b can communicate with each other even if the standing positions of the undulating weirs 92a and 91b are slightly changed.
[0078]
As described above, the undulation weirs 91a and 91b are arranged side by side, so that even when the width dimension of the river is large, it is possible to cope with it. Even if it is not possible, it is possible to cope without bending the fishway halfway.
[0079]
In the ninth embodiment, the case where the two undulation weirs 91a and 91b are provided side by side has been described, but it is needless to say that the number may be three or more depending on the width dimension of the river. In this case, the fishway does not have to be formed by the concave grooves formed in all the downstream dam plates, and may be configured appropriately according to the standing position of the normally used undulating dam.
[Brief description of the drawings]
FIG. 1 is a perspective view of a undulation weir according to a first embodiment.
FIG. 2 is a partially enlarged view of FIG.
3 is a partially enlarged view showing a mechanism that allows adjustment of a protruding dimension of the lid of FIG. 1. FIG.
FIGS. 4A to 4C are partial front views showing various forms of protrusions formed in the concave groove of FIG.
FIG. 5 is a perspective view of a undulation weir according to a second embodiment.
FIG. 6 is a perspective view of a undulation weir according to a third embodiment.
FIG. 7 is a perspective view of a undulation weir according to a fourth embodiment.
FIG. 8 is a partial side view of FIG. 7;
FIG. 9 is a perspective view of a undulation weir according to a fifth embodiment.
FIG. 10 is a perspective view of a undulation weir according to a sixth embodiment.
FIG. 11 is a perspective view of a undulation weir according to a seventh embodiment.
FIG. 12 is a perspective view of a undulation weir according to an eighth embodiment.
FIG. 13 is a perspective view of a undulation weir according to a ninth embodiment.
FIG. 14 is a perspective view of a undulation weir according to a tenth embodiment.
FIG. 15 is a cross-sectional view showing one aspect of a protrusion.
[Explanation of symbols]
2 Riverbed
3 Upstream dam plate
4 Downstream dam plate
2a, 3a spindle
5 Drive means
11 Fishway

Claims (4)

An upstream dam plate that is rotatably attached to the upstream edge in the width direction of the river bed, and an upstream edge that is rotatably connected to a spindle provided at the downstream edge of the upstream dam plate, the downstream edge of which is the river bed In the undulation weir with the downstream weir plate that slides
From the upstream edge of the downstream weir plate to the downstream edge, forming a fishway made of a concave groove that is inclined with respect to the flow-down direction,
An undulating weir characterized in that the downstream weir plate is provided with a lid that closes the upper opening of the concave groove from the upstream side and that can be adjusted in its closing dimension .   An upstream dam plate that is rotatably attached to the upstream edge in the width direction of the river bed, and an upstream edge that is rotatably connected to a spindle provided at the downstream edge of the upstream dam plate, the downstream edge of which is the river bed In the undulation weir with a downstream weir plate that slides
  From the upstream edge to the downstream edge of the downstream dam plate, forming a fishway made of a concave groove that is inclined with respect to the flow-down direction,
  An undulating weir characterized in that an auxiliary plate capable of adjusting an obliquely upward projecting dimension on the downstream side is attached to the upstream side weir plate except for the upstream position of the upstream end portion and the downstream end portion of the fishway.   An upstream dam plate that is rotatably attached to the upstream edge in the width direction of the river bed, and an upstream edge that is rotatably connected to a support shaft provided at the downstream edge of the upstream dam plate, the downstream edge of which is the river bed In the undulation weir with a downstream weir plate that slides
  From the upstream edge to the downstream edge of the downstream dam plate, forming a fishway made of a concave groove that is inclined with respect to the flow-down direction,
  Both the dam plates are provided with an automatic auxiliary undulation dam composed of an upstream auxiliary dam plate, a downstream auxiliary dam plate, and auxiliary drive means having substantially the same configuration capable of adjusting the water level further upstream of the damming position. A characteristic undulating weir.   An upstream side dam plate with one end edge rotatably attached to a support shaft fixed in the width direction of the river bed, and one end edge portion rotated around a support shaft provided at the other end side edge portion of the upstream side dam plate A plurality of undulating weirs that are connected movably and have downstream dam plates whose other edges slide along the river bed are arranged side by side in the river width direction so that no gaps are created between the undulating weirs. When a guide wall is erected and the standing position is the same for each undulating weir, a fishway is formed on the same straight line, and even if the standing position of each undulating weir is changed on the guide wall, the fishway If they are located on the same straight line, a relief recess that communicates them is formed to flow down from the upstream side to the downstream side at the fishway and the escape recess.

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