JP2008025310A - Fish-pass partition wall, fish-pass block and fish-pass structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fish-pass partition wall capable of improving a run rate of migratory small fishes going upstream. <P>SOLUTION: A run-up overflow portion 11 capable of helping fishes to run up is arranged at an upper part 10 of a partition wall main body 9 arranged across a water passage 6 and a groove-like recess 12 is arranged at the run-up overflow portion 11. The groove-like recess 12 has an inclined face 25 at a downstream side and an inclined face 26 at an upstream side connected at a bottom portion 23 so as to be about 90° angle. An arcuate side face 29 with a projection is continuously arranged on the upper part of inclined plane 25 at the downstream side and the side face 32 is continuously arranged on the upper part of inclines plane 26 of the upstream side. The fishes going upstream at the run-up overflow portion 11 can go upstream at the run-up overflow portion by migrating further to the upstream side after arriving at the groove-like recess 12 and taking rest. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is mainly suitable for small fishes such as octopus, sorghum, crucifers, loach, etc., for the purpose of constructing a fishway that can reasonably run up from a low water level to a high water level. It relates to fishway partitions, fishway blocks, and fishway structures.

  Various structures have been proposed for the fishway, and a fish run-up system disclosed in Japanese Patent Application Laid-Open No. 2000-120052 has been proposed as a fishway in which partition walls are arranged at required intervals so as to cross the water channel. Yes. In this upstream system, a plate-shaped partition wall is arranged at a required interval so as to cross the channel in the fishway channel, and the water overflows at the upper end of the partition wall. By setting the height at which the fish can run up to the water level on the downstream side, the fish was run up from the waterway side to the paddy field or fallow rice field side.

  However, when using the run-up system with such a configuration, the water that overflowed downstream of the partition wall falls downward, so that fish that run up the overflow section are resisted by this fall. It was difficult to go up. Especially in the case of small fish, there was a problem that even when trying to run up, it was easily struck by a down stream and the rate of going up was low.

  In order to solve such a problem, for example, Japanese Patent Application Laid-Open No. 2005-282287 discloses a fishway in which a fishway block whose upper surface is formed in a semicircular arc shape is disposed in a water channel at a required interval. When a fishway having such a configuration is used, since the overflow in the semicircular arc surface of the fishway block is gentle, it is easier for fish to go up than in the run-up system including the flat partition wall. It can be said that is planned. However, since the overflow part is formed in a semicircular arc surface, the upstream path becomes long, and in the case of small fish with weak swimming ability, it is difficult to go up the overflow part at once and it is easy to be swept away by water flow was there.

  Therefore, the present inventor can solve such problems by forming a groove-like recess that can rest the fish in the upper part of the overflow section that presents a semicircular arc surface, so that the fish can go up in two stages. I thought of the overflow section that I did. By the way, as a fishway block provided with a concave pool portion where fish can rest, a fishway block disclosed in Japanese Patent Application Laid-Open No. 2006-63656 has been proposed. In the fishway block, the pool rear wall is formed higher than the pool front wall, and the front end and the rear end are fitted together by a fitting method, and are sequentially connected in the length direction of the waterway. It was to compose. These fishway blocks are used by being sequentially connected to each other, and are not used independently, such as being arranged at a required interval in the length direction of the water channel. When using a fishway constructed by sequentially connecting in this way, since the upstream side wall surface having a large height is formed on the upstream side of the concave pool part, the fish that has reached the pool part as a resting place Further, when going upstream, there was a problem that the upstream side wall surface having a high height hindered the fish from going up smoothly. Even if the fishway blocks are arranged at a required interval in the length direction of the water channel, the angle of inclination of the upstream side wall surface of the pool portion is large as a substantially vertical state. There was a problem that it was difficult to jump in the pool and move upstream.

JP 2000-120052 A (page 3-7, FIG. 2 to FIG. 3) Japanese Patent Laying-Open No. 2005-282287 (page 4-7, FIG. 4, FIG. 5, FIG. 7) JP 2006-63656 A (page 3-4, FIG. 1, FIG. 3, FIG. 9, FIG. 11)

  The present invention has been developed in view of the problems of the prior art, and when raising fish from a low water level part to a high water level part, the ascent rate can be improved even for small fish. An object is to provide a partition for a fishway. It is another object of the present invention to provide a fishway block that can facilitate the construction of a fishway having a fishway partition. Furthermore, it is an object to provide a fishway structure that allows fishes to safely go up.

In order to solve the above problems, the present invention employs the following means.
That is, the first aspect of the fishway bulkhead according to the present invention is a fishway bulkhead disposed in a fishway waterway, on the upper part of the bulkhead body disposed on the bottom surface of the waterway so as to cross the waterway. And an upstream overflow section that allows the upstream of the fish to be provided, and an intermediate portion of the upstream section of the upstream section of the upstream section that forms an angle of 80 to 120 degrees with each other in the length direction of the water channel. A groove-like recess having a downstream inclined surface inclined upward toward the downstream side of the water channel and an upstream inclined surface inclined upward toward the upstream side of the water channel. An upper portion of the inclined surface on the downstream side is connected to an upper portion of the arcuate side surface protruding on the downstream side of the partition wall body, and the upper portion of the upstream inclined surface is formed on the partition wall. It is characterized by being connected to the upper part of the upstream side surface of the main body.

  The second aspect of the fishway partition according to the present invention is a fishway partition disposed in a fishway waterway, and the upper part of the partition body disposed on the bottom surface of the waterway so as to cross the waterway is: The one end side is formed lower than the other part, and the one upstream end part is provided with a run-up overflow section that allows fish to run up, and the length of the water channel of the run-up overflow section is provided. A downstream inclined surface that is inclined upward toward the downstream side of the water channel and upstream of the water channel, which is connected to the middle portion of the width portion viewed in the lateral direction at the bottom so as to form an angle of 80 to 120 degrees with each other. A groove-shaped concave portion provided with an upstream inclined surface inclined upward toward the side is formed, and an upper portion of the downstream inclined surface is formed in an arcuate shape protruding upward on the downstream side of the partition wall body. And an upper portion of the upstream inclined surface is above the upstream side surface of the bulkhead body. And it is characterized in that it is provided continuously on.

  A third aspect of the partition for a fishway according to the present invention is a partition for a fishway disposed in a waterway for a fishway, and the upper part of the partition body disposed on the bottom surface of the waterway so as to cross the waterway is One end side is formed to be lower than the other part, and one upstream side is provided with a run-up overflow section that allows fish to run up. The slope part which becomes gradually high toward the other end part side is connected, and it is 80-120 degrees mutually in the middle part of the width part seen in the length direction of the waterway of the run-up overflow part. A downstream inclined surface that is inclined upward toward the downstream side of the water channel and an upstream inclined surface that is inclined upward toward the upstream side of the water channel, which are connected at the bottom so as to form an angle, are provided. A groove-shaped recess is formed, and the upper portion of the downstream inclined surface is on the downstream side of the partition wall main body, the arc-shaped side protruding upward Along with being provided continuously on the top, the upper end of the inclined surface of the upstream side, and is characterized in that it is provided continuously to the upper end of the side surface of the upstream side of the partition wall body.

  The fourth aspect of the fishway partition according to the present invention is a fishway partition disposed in the fishway waterway, and the upper part of the partition body disposed on the bottom surface of the waterway so as to cross the waterway is The one end side is formed lower than the other part, and on one end side there is provided a horizontal run-up section that allows fish to run up. The slope part which becomes gradually high toward the other end side of the upper part is continuously arranged, and the upstream part of the upstream part of the upstream part of the width part seen in the length direction of the water channel is 80 to 120 degrees each other. A downstream inclined surface that is inclined upward toward the downstream side of the water channel and an upstream inclined surface that is inclined upward toward the upstream side of the water channel, which are connected at the bottom so as to form an angle, are provided. A groove-shaped recess is formed, and the upper portion of the downstream inclined surface is on the downstream side of the partition wall main body, the arc-shaped side protruding upward Upper while being continuously to the upper inclined surface of the upstream side, and is characterized in that it is provided continuously to the upper side of the upstream side of the partition wall body.

  In the case where the inclined portion is provided on the upper portion of the partition wall main body, it is preferable that a portion of the inclined portion near the upstream run-up portion is formed in an arc shape protruding downward.

  In the fishway partition according to the first to fourth aspects, it is preferable that the distance between the upper part of the inclined surface on the downstream side and the bottom part is set to 5 to 30 mm.

  In the fishway partition according to the first to fourth aspects, the width in the length direction of the water channel of the partition main body is set to 60 to 200 mm, and the bottom portion is set to the central portion of the width portion of the partition main body. It is good to be located.

  In the fishway bulkhead according to the first to fourth aspects, the upper projecting arc-shaped side surface connected to the downstream inclined surface, and the upper projecting quadrant arc-shaped side surface are presented. It is preferable that the upper part of the inclined surface on the downstream side is connected to the upper part of the four-sided arc-shaped side surface, and the connected part is formed as an arcuate surface protruding upward.

  In the fishway bulkhead according to the first to fourth aspects, the upper projecting arc-shaped side surface connected to the downstream inclined surface, and the upper projecting quadrant arc-shaped side surface are presented. And the upper part of the inclined surface on the downstream side is connected to the upper part of the quadrant arc-shaped side surface, and the quadrant arc-shaped side surface has a height of 1/4 to 3/4 from the bottom surface of the partition wall body. The upper side surface portion and the lower side surface portion that are divided vertically in the part are composed of the lower side surface portion, and the lower side surface portion is formed at the lower end of the upper side surface portion formed in the four-part arcuate surface. As an extension of the divided arcuate surface, it is preferable that the segmented arcuate surface is arranged so as to be located upstream of the virtual four-divided arcuate surface that is assumed to be continuously continuous downward.

  In the fishway bulkhead according to the first to fourth aspects, the side surface on the upstream side of the bulkhead body where the upper part of the inclined surface on the upstream side is connected is a right-angled side surface substantially perpendicular to the bottom surface of the water channel. In addition, it is preferable that the connecting portion between the upper portion of the upstream inclined surface and the upper portion of the right side surface is formed as an arcuate surface protruding upward.

  In the fishway partition according to the first to fourth aspects, the upper portion of the upstream inclined surface may be set higher than the upper portion of the downstream inclined surface.

  In the partition for fishway according to the second, third, and fourth aspects, on the downstream side surface of the partition body, and on the portion located on the other end side of the upstream run-up part, It is preferable to provide a collision-preventing cavity for preventing a collision of fish going up the upstream run-up section without opening the upstream side surface.

  In the fishway partition according to the second, third, and fourth aspects, on the downstream side surface of the partition main body, and on the portion located on the other end side of the upstream part, An anti-collision cavity for preventing collision of upstream fish going up the upstream part is provided without opening the upstream side surface, and the upper edge height of the anti-collision part is set to the upstream part. It is better to set it equal to or higher than the top end height of.

  In the fishway partition including the collision prevention cavity, it is preferable that an internal cavity extending toward the one end is continuously provided inside the partition body.

  In the fishway partition including the collision prevention cavity, the collision prevention cavity may be configured to be opened at the other end of the partition body.

  The fishway block according to the present invention is characterized in that each of the fishway partition walls is disposed in a fixed state on the bottom surface of the waterway so as to cross the waterway member.

  In another aspect of the fishway block according to the present invention, a plurality of the fishway partition walls are disposed in a fixed state on the bottom surface of the waterway so as to cross the waterway member, and the waterway channel. For the fishway bulkheads that are adjacent in the length direction, the anti-collision cavity of the fishway bulkhead located upstream is opposed to the upstream part of the fishway bulkhead located downstream. It is characterized by.

  In the fishway structure according to the present invention, any one of the fishway partition walls provided with a collision prevention cavity in a waterway for a fishway is disposed at a required interval in the length direction of the waterway so as to cross the waterway. Regarding the fishway bulkhead adjacent in the length direction of the water channel, the collision prevention cavity of the fishway bulkhead located upstream is opposed to the upstream part of the fishway bulkhead located downstream. It is characterized by being.

The present invention has the following excellent effects.
(1) The fishway bulkhead according to the present invention is provided with a run-up overflow section allowing fish to run up at the upper part of the bulkhead body, and the upstream run-up section forms an angle of 80 to 120 degrees with each other. In this way, a groove-shaped recess composed of a downstream inclined surface and an upstream inclined surface connected at the bottom is provided, and the upper portion of the downstream inclined surface protrudes upward on the downstream side of the partition wall body. It is connected to the upper part of the arc-shaped side.
Therefore, according to the present invention, even a small fish can move up relatively easily along the arc-shaped side surface of the projection, which has a calm overflow condition, and can reach the groove-shaped recess. The fish that has reached the groove-shaped recess can temporarily rest in the groove-shaped recess, and by swinging the tail fin and kicking the inclined surface on the downstream side by the tail fin or tail handle, Can be moved obliquely upward, thereby allowing the groove-shaped recess to escape.
As described above, the fish can easily go up the fishway partition wall in two stages. Therefore, according to the present invention, the fish going up rate can be improved.

(2) The upper part of the bulkhead body is formed such that one end side is lower than the other part, and the upstream part that allows the fish to run up is provided on the one end side. In such a case, by arranging the fishway partition wall having such a configuration in the water channel so that the upstream run-up section is in a staggered arrangement, the flow velocity of the channel water flowing over the upstream run-up section is increased. It can be weakened by the above-mentioned other high portions, and the overflow water can be guided toward the upstream portion of the fishway partition located on the downstream side. As a result, the channel water can be made to flow in a meandering flow with a reduced flow velocity, facilitating the fish going up in the upstream run-up section, and improving the fish going up rate.

(3) One end side is formed lower than the other part, a run-up overflow part is provided on the one end side, and the run-up overflow part is gradually moved toward the other end side. When the inclined part which becomes high is connected continuously, even if the flow rate of channel water fluctuates, the water depth suitable for the fish going up can be secured by the inclined part. This can improve the rate of fish run-up.
In particular, in the case where a horizontal upstream part is provided on the one end side, a straight and gentle upstream state with a substantially uniform water depth is obtained in the horizontal upstream part. It is possible to improve the fish run-up rate in the horizontal run-up section.

(4) In particular, when the arc-shaped side surface projecting upward is configured as a quadrant arc-shaped side surface projecting upward, the quadrant arc-shaped side surface is formed from 1/4 to the bottom surface of the partition wall body. The upper side surface portion is formed of an upper side surface portion and a lower side surface portion that are vertically divided at a height of 3/4, and the lower side surface portion is formed into a quadrant arc-shaped surface. In the case of adopting a configuration in which the lower end of the four-segment arc-shaped surface is continuously arranged so as to be located on the upstream side of the hypothetical four-segment arc-shaped surface that is assumed to be continuously continuous downward as an extension of the four-segment arc-shaped surface, The fish can be easily moved up to the recess.
That is, the water flowing down the upper side surface portion that presents a quadrant arc-shaped surface tends to flow in the substantially tangential direction at the lower end side portion of the upper side surface portion, and accordingly, downward in the lower side surface portion. The flow rate of the lower side portion of the lower side portion, which is a run-up section for fish going up, can be made more gentle, so that the fish It is possible to go up more easily and reach the groove-like recess.

(5) In particular, when the portion of the inclined portion near the upstream run-up portion is formed in a downwardly protruding arc shape, the water depth of the shore portion is compared with the case where the inclined portion is linear. It can be formed deeper. For this reason, even if there is a fish that goes up at the edge of the water, it is possible to make the fish run up in a state that is not too difficult. In addition, by forming a circular arc projecting downward, it is possible to relieve changes in the water depth in the inclined portion, and to further improve the overflow state in the horizontal upstream upstream portion. This can improve the fish run-up rate.

(6) When the upper portion of the upstream inclined surface is positioned higher than the upper portion of the downstream inclined surface, the flow that overflows the upper end of the upstream inclined surface collides with the downstream inclined surface. Therefore, the turbulent state of the flow on the inclined surface on the downstream side can be prevented as much as possible, and the fish can be moved up smoothly.

(7) In particular, the width in the length direction of the water channel of the partition wall main body is set to 60 to 200 mm, and the bottom of the groove-shaped recess provided in the upstream run-up section is positioned at the central portion in the width direction of the partition wall main body. In this case, the fish run-up route can be divided into a front half and a rear half, and even for small fishes, it is possible to go up the fishway partition without difficulty and contribute to the improvement of the run-up rate.

(8) The fishway partition wall according to the present invention is formed such that the upper part of the partition wall main body is formed such that one end side thereof is lower than the other end part and the upstream end part is provided on the one end part side. When configured, a collision that prevents a collision of an upstream fish that goes up the upstream upstream section on a portion of the side surface on the downstream side of the bulkhead body that is located on the other end side of the upstream upstream section In the case of adopting a configuration in which a prevention cavity is provided, for a fishway bulkhead that is adjacent in the length direction of the waterway, a collision of a fishway bulkhead located on the upstream side with the upstream upstream part of the fishway bulkhead located on the downstream side When the prevention cavities are arranged in an opposing state to constitute a fishway structure, it is possible to effectively prevent the collision of the upstream fish. Thereby, the going-up rate of fish can be improved.
When the internal cavity is connected to the collision prevention cavity inside the bulkhead body, the fish that entered the collision prevention cavity when the upstream fish is aimed at a long-legged bird such as a heron, You can avoid danger by running into the inner cavity.

(9) When using a fishway block in which a fishway partition wall according to the present invention is disposed on a waterway member, there is an advantage that a required fishway can be easily and efficiently constructed by connecting the fishway block. is there.

  1-3, a fishway partition wall 1 according to the present invention is mainly intended for small fish with weak swimming ability, such as sea lions, sorghum, crucifers, loach, and the like. Is used to construct a fishway 5 that can be reasonably moved up to a high water level part 3 such as a reservoir (paddy field, fallow field, reservoir, etc.), and crosses the waterway 6 to a waterway 6 for fishway In the upper part 10 of the partition wall body 9 arranged on the bottom surface 7 of the water channel, a upstream upstream part 11 is provided that allows the water channel to overflow from the upstream side toward the downstream side, allowing fish to run up, A groove-like recess 12 is formed in an intermediate portion of the width portion 8 of the upstream run-up portion 11 viewed in the length direction of the water channel 6.

  As the fishway partition wall 1 for constituting the fishway 5, in this embodiment, the first type fishway partition wall 1a shown in FIGS. 4 to 10 and the second type fishway partition wall 1b shown in FIGS. Is going to be used. The difference between the two types is that a collision prevention cavity 45 (described later) provided in an open state on a downstream side surface 41 (described later) of the partition wall body 9 is provided on either side of the both ends 14 and 15 of the partition wall body. Other configurations are the same. Therefore, in the following description, the configuration of the first type fishway partition wall 1a will be mainly described in detail.

  In the present embodiment, the first and second types of fishway partition walls 1a and 1b are both configured as concrete blocks independent of the water channel 6, and are used for fishway construction intended for small fish. In consideration of this, the width L1 of the partition wall 9 in the length direction of the water channel 6 is set to 60 to 200 mm, preferably 100 to 150 mm. The bulkhead body 9 has a horizontal bottom surface 13 (FIG. 5) fixed in contact with the water channel bottom surface 7, and both end portions 14 and 15 are formed on the water channel side surfaces 16 and 16 as shown in FIG. The upper part 10 of the upper part 10 is formed such that one end part side 17 is lower than the other part 19 and the one end part side 17 has a part L2 in the range of 10 to 20 mm. FIG. 7) shows the horizontal upstream part 11 that allows fish to run up. The upstream part 11 is provided with an inclined part 21 that gradually increases toward the other end side 20 of the upper part 10, and a substantially horizontal horizontal upper part 22 is provided at the upper end of the inclined part 21. ing. In the present embodiment, as shown in FIG. 7, the inclined portion 21 is formed as an arcuate portion 21a projecting downward from the upstream portion 11 while the portion near the horizontal upper portion 22 is formed. , And is formed as a protruding arcuate portion 21b.

  As shown in an enlarged view in FIG. 8, the groove-like recess 12 is formed on the downstream side of the water channel 6, which is continuous at the bottom 23 so as to form an angle θ1 of 80 to 120 degrees, preferably 90 to 110 degrees. It has a downstream inclined surface 25 that is inclined upward and an upstream inclined surface 26 that is inclined upward toward the upstream side of the water channel 6. In the present embodiment, the bottom portion 23 has a downwardly protruding arc shape, and the downstream inclined surface 25 and the upstream inclined surface 26 are almost linear in this embodiment. Strictly speaking, it is formed as a projecting circular arc surface slightly above. The reason why the circular arc surface is formed so as to protrude slightly above is to further adjust the flow state of the channel water flowing into the groove-like recess 12. Further, the distance L3 between the upper end 27 of the downstream inclined surface 25 and the bottom 23 is set to 5 to 30 mm, preferably 7 to 15 mm.

  Then, as shown in FIG. 8A, an upper portion 27 of the inclined surface 25 on the downstream side is connected to an upper portion of an arc-shaped side surface 29 protruding upward on the downstream side of the partition wall main body 9, The continuous portion 30 is formed in an arc surface protruding upward. Further, the upper portion 31 of the upstream inclined surface 26 is connected to the upper portion of the upstream side surface 32 of the partition wall body 9 (in this embodiment, a right side surface 32a substantially perpendicular to the bottom surface 13; The connecting portion 33 is formed on the arc surface protruding upward, and the connecting portions 30 and 33 are formed on the protruding arc surface in this way because the fish reaches the groove-shaped recess 12. Then, when the groove-shaped recess 12 is escaped, it is difficult to be damaged.

  In the present embodiment, the arcuate side surface 29 protruding upward is configured as a quadrant arcuate side surface 29a protruding upward. More specifically, the quadrant arc-shaped side surface 29a is preferably formed at a height portion 37 of ¼ to ¾ from the bottom surface 13 of the partition wall body 9, as shown in FIGS. Is composed of an upper side surface portion 35 and a lower side surface portion 36 which are divided vertically at a substantially half height portion, and the lower side surface portion 36 is an upper side formed in a quadrant arc-shaped surface. Are connected to the lower end 37 of the side surface portion 35 so as to be positioned upstream of a virtual quadrant arcuate surface 35a (shown by a one-dot chain line) 35a that is assumed to be continuously extended downward as an extension of the quadrant arcuate surface. It is installed. As will be described later, the position of the approximately half-height portion 37 here is as long as the overflow in the vicinity of the lower side surface portion 36, which is a run-up section for fish going up, becomes more gradual. It is not exactly specified as a half height portion, and may be slightly up and down.

  In addition, the height L4 of the upper end of the downstream portion of the groove-like recess 12 of the upstream run-up section 11 with respect to the horizontal bottom surface 13 is preferably 30 to 90 mm. If it is lower than 30 mm, it is suitable for going up a smaller fish, but the effect of reducing the flow velocity by the right side surface 32a is not preferred, and it is not preferable. In the water reservoir 39 (FIG. 3) between the partition walls 1 and 1 for the fishway. Unnecessary water depth cannot be secured. On the other hand, if it is higher than 90 mm, it is not preferable because it is difficult for a small fish to go up.

  In the present embodiment, in consideration of abnormal water increase, the groove-like recess 12 is made continuous with the portion other than the upstream run-up portion 11 (FIGS. 4 and 6).

  In the present embodiment, the width L1 of the partition wall 9 in the length direction of the water channel 6 is set to 60 to 200 mm. When the width L1 is smaller than 60 mm, the fish is caused to run upstream in the upstream and upstream section 11. This is because it becomes difficult to form the protruding arc-shaped side surface 29 and the groove-shaped concave portion 12 on the necessary portion. On the other hand, if it is larger than 200 mm, the run-up distance is long for small fish, and the run-up rate is deteriorated.

  Further, the angle θ1 formed by the downstream inclined surface 25 constituting the groove-shaped recess 12 and the upstream inclined surface 26 is set to 80 to 120 degrees when the angle θ1 is smaller than 80 degrees. The fish resting in the groove-shaped recess 12 is forced to take an unreasonable posture, and as described later, it is difficult to obtain an effective repulsive force even if the fish swings its tail and repels the groove-shaped recess. Because. On the other hand, when the angle is greater than 120 degrees, the repulsive force for escape when the tail is swung with respect to the inclined surface 25 on the downstream side cannot be effectively obtained, and the water depth in the groove-shaped recess 12 is reduced. This is because the groove-like recess 12 is not suitable for resting fish.

  In addition, the distance L3 between the upper end 27 of the inclined surface 25 on the downstream side and the bottom 23 is set to 5 to 30 mm. This is intended for small fish whose fishway 5 has a weak swimming ability. In consideration of the fact that the small fish is tailed, the tail height of the small fish is set to 10 mm to 20 mm. This is because when the distance L3 is smaller than 5 mm, it is difficult to obtain a repulsive force enough to escape the groove-like recess 12 even if the fish swings its tail. On the other hand, if it is larger than 30 mm, the groove-like recess 12 becomes too deep and it becomes difficult for fish to escape from the groove-like recess 12.

  If the dimension of the principal part of the partition 1 for fishway which has such a structure is illustrated, the length L5 (FIG. 7) between the both ends 14 and 15 of the said partition main body 9 is 280 mm, and the length direction of the said waterway 6 Width L1 (FIG. 8A) is set to 120 mm. The horizontal upstream portion 11 has a length L2 (FIG. 7) of 15 mm, and a height L4 (FIG. 7) of the upper end of the downstream portion of the groove-shaped recess 12 with respect to the horizontal bottom surface 13. Is set to 56 mm. The inclination angle of the inclined portion 21 with respect to the horizontal plane is set to about 30 degrees.

  Further, the radius of curvature R1 (FIG. 7) of the arcuate portion 21a projecting downward is set to 177 mm, and the radius of curvature R2 of the arcuate portion 21b projecting upward is set to 200 mm. The height L6 (FIG. 7) of the upper end 24 of the projecting arcuate portion 21a is set to 100 mm, and from one end 40 of the upper portion 10 to the upper end 24 of the projecting arcuate portion 21a. The distance L7 (FIG. 7) is set to 115 mm, for example. Further, the bottom 23 of the groove-shaped recess 12 is located at the central portion in the width direction of the partition wall main body 9 as shown in FIG.

  The downstream inclined surface 25 and the upstream inclined surface 26 are configured to be continuous at the bottom 23 so as to form an angle of 90 degrees, and the downstream inclined surface 25 with respect to the horizontal bottom surface 13. The inclination angle θ2 (FIG. 8A) is set to 73 degrees, and the inclination angle θ3 (FIG. 8A) of the upstream inclined face 26 with respect to the horizontal bottom face 13 is set to 17 degrees. . A distance L3 (FIG. 8B) between the upper end 27 of the downstream inclined surface 25 and the bottom 23 is set to 12 mm, and the upper end 31 and the bottom of the upstream inclined surface 26 are set. 23 is set to 40 mm, and the upper surface 31 of the upstream inclined surface 26 is inclined to the downstream side while the bottom surface 13 of the fishway partition wall 1 is horizontal. The height is slightly higher than the upper portion 27 of the surface 25, and the height difference is set to, for example, about 4.5 mm.

  Also, as shown in FIGS. 4 to 5 and FIG. 9, the side surface 41 is located on the downstream side of the partition wall body 9 and is located closer to the other end 14 side of the partition wall body 9 than the upstream run-up portion 11. In the present embodiment, a collision prevention cavity 45 for preventing the collision of the upstream fish is provided in a portion 43 (in the present embodiment, a substantially half of the downstream side surface 41 on the other end 14 side) 43. Yes. The anti-collision cavity 45 is provided so that the portion 43 of the partition wall body 9 is opened but the upstream side surface 46 is not opened, and the other end 14 and the bottom surface 13 of the partition wall body 9 are opened. It is provided to be in an open state. The side edge 49 on the one end side of the opening 47 of the collision prevention cavity 45 is in a substantially vertical state, and a substantially horizontal upper edge 51 is connected via an arc edge 50. As shown in FIG. 7, the height L9 of the horizontal upper edge 51 is set to be higher than the height of the uppermost end of the upstream upstream section 11, that is, the height of the horizontal upstream upstream section 11. Yes. For example, the height with respect to the horizontal bottom surface 13 is set to 110 mm. The length L10 (FIG. 7) in the water channel width direction of the collision prevention cavity 45 is 140 mm, and the width L11 in the water channel length direction is set to 90 mm. In the present embodiment, as shown in FIG. 10, the edge portion 52 (FIG. 9) of the opening 47 of the collision preventing cavity 45 is formed as an inclined edge so that the heel side is enlarged.

  In this embodiment, as shown in FIGS. 5 and 7, an internal cavity 53 extending toward the one end 15 is connected to the collision prevention cavity 45 inside the partition wall body 9. The tip of the internal cavity 53 is in a close proximity to the one end 15.

  FIG. 1 shows a fishway 5 constructed by alternately arranging a first fishway partition wall 1a and a second fishway partition wall 1b as blocks having the above-described configuration in the fishway waterway 6 at a required interval. The fishway partition walls 1a and 1b are arranged at an interval L13 (FIG. 3) of about 150 mm in consideration of the body length because the fishway 5 is intended for small fish. . The water channel bottom surface 7 of the water channel 6 has a gradient of about 11 degrees in the present embodiment, and the fishway partition wall 1 has a bottom surface 13 as shown in FIGS. The both ends 14 and 15 are in contact with the water channel side surfaces 16 and 16 of the water channel 6 and are fixed to the water channel 6 through mortar or the like. In this way, the fishway 5 configured with the fishway partition wall 1 fixed to the water channel 6 is, as shown in FIG. 2, the fishway partition wall 1A located on the downstream side with respect to the vertically adjacent fishway partition walls 1A and 1B. The upstream run-up section 11 has a fishway structure 55 in which the collision prevention cavity 45 of the fishway partition wall 1B located on the upstream side is opposed. Accordingly, in the waterway 6 for the fishway, the upstream run-up portion 11 formed lower than the other portion 19 is arranged in a staggered manner.

  Since the fishway partition walls 1a and 1b have the collision preventing cavity 45 and the inner cavity 53 as described above, the fishway partition wall 1 is fixed to the water channel bottom surface 7 so that the downstream side is opened. An L-shaped cavity portion 56 (FIGS. 2 and 4) is formed by connecting the inner cavity portion 53 closed in the circumferential direction to the collision prevention cavity portion 45 thus formed.

  3 and 13 show a section of the fishway partition wall 1 fixed to the channel bottom 7 as described above, and are inclined about 11 degrees toward the downstream side of the channel. In this state, as shown in FIG. As described above, the inclination angle θ4 of the downstream inclined surface 25 forming the groove-like recess 12 with respect to the horizontal plane is 62 degrees, and the upper portion 27 of the downstream inclined surface 25 has the quadrant arc-shaped side surface 29a. The upper part is connected. Further, the inclination angle θ5 of the upstream inclined surface 26 with respect to the horizontal plane is 28 degrees, and the upper portion 31 of the upstream inclined surface 26 is connected to the upper portion of the right side surface 32a. In this state, the upper portion 31 of the upstream inclined surface 26 is formed higher than the upper portion 27 of the downstream inclined surface 25, and the difference in height is about 16 mm.

  However, when the fishway 5 having such a configuration is used, the channel water flowing down the water channel 6 hits the right side surface 32a while being guided by the right side surface 32a while being impinged on the right side surface 32a, as shown by arrows in FIGS. It flows diagonally from the water channel side surface 16a side to the other water channel side surface 16b side, and then overflows the upstream run-up section 11 downstream. The aqueduct water sequentially repeats this, and flows down the fishway 5 in a meandering state while reducing the momentum of the water. Between the fishway partition walls 1, 1 adjacent in the length direction of the waterway 6, there is a swimming ability. A water reservoir 39 having a relatively slow flow suitable for a weak small fish is formed. And the water of this water storage part 39 will be in the state which entered into the said collision prevention cavity 45 and the said internal cavity 53, as shown in FIG.

  Normally, the flow rate of the channel water in the fishway 5 is set so that a water depth of about 20 mm is obtained in the horizontal upstream section 11 as shown in FIG. When the water depth is set in this way, from the relationship of the inclination angle of the inclined portion 21, as shown in FIG. 16, a portion 59 of the upper part 10 of the partition wall body 9 separated from the one water channel side surface 16a by about 80 mm. Will be in contact with overflow water. The water reservoir 39 is formed between the fishway partition walls 1 and 1 adjacent in the length direction of the water channel 6.

  The overflow state in the horizontal upstream section 11 will be described in more detail. As shown in FIG. 3, the water channel has a water depth of about 20 mm from the upstream side 60 to the downstream side 61 of the upstream section. Water flows down. In the present embodiment, as shown in FIG. 17, the upper portion 31 of the upstream inclined surface 26 is higher than the upper portion 27 of the downstream inclined surface 25, and therefore, the upper end 26 of the upstream inclined surface 26. The flow that has crossed the surface is less likely to collide with the inclined surface 25 on the downstream side. Therefore, the turbulent state of the flow on the inclined surface 25 on the downstream side can be prevented as much as possible, and the fish can be moved up smoothly. Become. And the water which flowed into the groove-shaped recessed part 12 of the said horizontal upstream overflow part 11 is shown in FIG. 14, FIG. 17, since this groove-shaped recessed part 12 is horizontal, As shown in FIG. 14, FIG. Dispersed by the horizontal linear upper portion 27, the water will flow over in a gentle flow state with a substantially uniform water depth. As a result, a gentle flow state along the arc-shaped side surface 29 is formed on the arc-shaped side surface 29 protruding upward. Thereby, the fish can easily go up along the arc-shaped side surface 29 and reach the groove-shaped recess 12.

  In particular, in the present embodiment, as shown in an enlarged view in FIG. 17, the arcuate side surface 29 protruding upward is configured as a quadrant arcuate side surface 29a protruding upward. More specifically, as described above, the lower side surface portion 36 is continuously formed downwardly as an extension of the quadrant arc-shaped surface at the lower end 37 of the upper side surface portion 35 formed in the quadrant arc-shaped surface. It is continuously provided in a bent state so as to be positioned upstream of a virtual quadrant arcuate surface (indicated by a one-dot chain line) 35a assumed to be continuous. Therefore, the water flowing down the upper side surface portion 35 having a quadrant arcuate surface flows in a substantially tangential direction at a lower end side portion of the upper side surface portion 35 as shown by an arrow F1 in FIGS. Along with this, the downward flow velocity in the lower side surface portion 36 can be suppressed to be relatively small. As a result, the overflow in the vicinity of the lower side surface portion 36, which is a run-up section for fish going up, becomes more gentle. Therefore, the fish can easily go up the lower side surface portion 36 and reach the groove-shaped recess 12 as indicated by an arrow F2 in FIGS.

  FIG. 18 shows a state where the fish 62 has reached the groove-like recess 12. The fish 62 that has reached the groove-like recess 12 is supported on the upstream inclined surface 26 in a natural posture. In this state, the tail fin 63 can be brought into contact with the inclined surface 25 on the downstream side without difficulty.

  Therefore, the fish that has reached the groove-like recess 12 has a tail fin 63 with respect to the inclined surface 25 on the downstream side after having temporarily rested in the groove-like recess 12 or immediately after reaching the groove-like recess 12. Can be moved obliquely upward along the upstream inclined surface 26 by the repulsive force when the inclined surface 25 is kicked by the tail fin 65 or the tail handle 65, thereby escaping the groove-shaped recess 12 The water reservoir 39 existing on the upstream side of the fishway partition wall 1 can be entered.

  When the fish escapes from the groove-like recess 12 in this way, if the momentum of escape is strong, as shown by the arrow in FIG. 3, the collision prevention cavity 45 of the fishway partition wall 1 disposed on the upstream side. You can get inside. If such a collision prevention cavity 45 is not provided, the fishway partition wall 1 in which the fish 62 that escapes from the groove-like recess 12 exists on the upstream side when the moment of escape from the groove-like recess 12 is strong. However, by providing the collision prevention cavity 45 as in the present embodiment, fish can enter the collision prevention cavity 45 as in the present embodiment. This can be avoided and prevent damage to the fish that run up. Since the collision prevention cavity 45 is provided without opening the upstream side surface 46 of the partition wall main body 9, there is no water flow jetted into the collision prevention cavity 45 from the upstream side. Can smoothly enter into the collision preventing cavity 45.

  In addition, the collision prevention cavity 45 also functions as a hiding place from birds and the like. In particular, in the present embodiment, the internal cavity portion 53 is connected to the collision prevention cavity portion 45, so that when the upstream fish is aimed at a long-legged bird such as a heron, the collision prevention cavity portion 45 The fish that have entered can escape to the back of the internal cavity 53 (FIG. 14) to avoid danger. As described above, the internal cavity 53 is effective as a countermeasure against feeding damage of birds such as herons, but in addition, it can also serve as a habitat for aquatic insects, and therefore can serve as a feeding ground for fish that run upstream.

  Ascending fish can go up from the drainage channel 2 to the reservoir 3 as the paddy field, the fallow rice field, etc., as shown by the arrow in FIG.

  In the present invention, the collision prevention hollow portion 45 is provided on the downstream side surface 41 of the partition wall main body 9 and on the other end portion 14 side of the upstream run-up portion 11. However, if the anti-collision cavity 45 is provided so as to extend toward the upstream run-up section 11, or the internal cavity 53 is opened on the side surface 41 on the downstream side of the partition wall body 9, When the fish runs up the upstream part 11, the upstream fish is caught by the upper edge part of the collision prevention cavity 45 and the upper edge part of the internal cavity part 53, resulting in a trouble that causes upstream trouble. It becomes. In addition, since the water flow that overflows in the upstream run-up section 11 is disturbed when it flows over the upper edge portion of the collision prevention cavity 45 or the upper edge portion of the internal cavity 53, there is a problem that prevents the fish from going up. is there.

  FIG. 19 shows a case where the flow rate of the channel water flowing through the fishway 5 is very large. The depth of the overflow water overflowing the upstream run-up section 11 is increased, and the upper side of the upper portion 10 is increased. Overflow water is in contact at site 66. The increase of the overflow water depth in this way means that the water depth in the horizontal upstream run-up section 11 becomes larger than the planned water depth. The water surface 67 at the planned water depth is shown by a one-dot chain line in FIG. As a result, depending on the fish, the horizontal upstream run-up section 11 having a large water depth may be avoided, and the shallow part above it may be selected and run up.

  More specifically, in the present embodiment, the horizontal upstream part 11 is provided with an inclined part 21 that gradually increases toward the other end, so that the amount of water flowing down the water channel 6 is small. When the water depth of the channel water increases and the water depth increases, the water depth in the inclined portion 21 changes according to the inclination angle of the inclined portion 21. Therefore, when the water depth of the channel water fluctuates in this way, the fish can go up by selecting an appropriate water depth portion in the inclined portion 21 while avoiding a large water depth portion in the horizontal upstream run-up portion 11. Also occurs. In particular, in this embodiment, as described above, the portion of the inclined portion 21 near the upstream portion 11 has a downwardly protruding arc shape, so that the water depth of the shore portion 69 is set to the inclined portion 21. Can be formed deeper as compared with the case of a straight line. For this reason, even if there is a fish that goes up and down by selecting the shallow water portion 69, it is possible to make the fish run up without much difficulty. In addition, by forming the portion of the inclined portion 21 near the upstream upstream portion 11 in this manner in the shape of a protruding arc, the change in the water depth in the inclined portion is reduced, and the horizontal upstream upstream portion 11 is relieved. It is easy to arrange the overflow condition.

  In the embodiment, the fishway partition wall 1 is configured as a block independent of the water channel 6, but the fishway partition wall 1 may be configured integrally with the water channel 6.

  20 to 21 and FIG. 22 show a fishway block 71 that constitutes a fishway having a predetermined length by joining the open ends 70, 70, and a separate fishway partition wall 1 is provided on the waterway member 72. Is provided in a fixed state. A fishway block 71a shown in FIGS. 20 to 21 and a fishway block 71b shown in FIG. 22 differ in that the collision preventing cavity 45 is provided on either side of the both ends 14 and 15 of the bulkhead body 9, and other configurations. Is the same.

  The water channel member 72 is formed in a U-shaped groove shape having a water channel 6 for a fishway, and a strip-shaped water stop material 75 is interposed between the inner peripheral edge portions of both end portions 73 and 73 as shown in FIG. A kerf-shaped recess 76 is formed in a U-shape. The fishway partition wall 1 is provided on the bottom surface 7 of the waterway so as to cross the waterway 6 at, for example, a central portion in the length direction of the waterway member 72, and the fishway partition wall 1 and the waterway member 72 In the present embodiment, the distances L12 and L13 between the both end portions 73 and 73 are set to about 75 mm, respectively.

  The fishway partition wall 1 has the same configuration as shown in FIGS. 4 to 6, and the upper part 10 of the partition wall body 9 is formed such that one end side 17 thereof is lower than the other part 19. A horizontal upstream part 11 having the same configuration as that described above is formed on one end side 17, and the upstream part 11 gradually increases toward the other end side 20 of the upper part 10. An inclined portion 21 is provided continuously. Then, as shown in FIG. 21, a groove-like recess 12 having the same configuration as described above is formed in the upstream section 11 as shown in FIG. An upper portion 27 of the inclined surface 25 on the downstream side is formed on an arc-shaped side surface protruding upward on the downstream side of the partition wall body 9 (in this embodiment, a side surface 29a having a quadruple arc shape protruding upward) 29. The upper part 31 of the upstream inclined surface 26 is connected to the upper part, and the upper part 31 of the upstream side of the partition wall body 9 (in the present embodiment, a right side surface 32 a that is substantially perpendicular to the water channel bottom surface 7) 32. It is connected to. Further, the downstream side surface 41 of the partition wall body 9 is provided with an L-shaped cavity portion 56 similar to the above, which is composed of the collision prevention cavity portion 45 and the internal cavity portion 53, having the same configuration as described above. Yes.

  The fishway partition wall 1 is configured such that the bottom surface 13 of the partition wall body 9 is in contact with the water channel bottom surface 7 and the both end portions 14 and 15 thereof are in contact with the water channel side surfaces 16 and 16 and mortar or the like. Thus, the water channel member 72 is fixed.

  When constructing the fishway 5 using the fishway blocks 71a and 71b having such a configuration, as shown in FIG. 23, for example, the fishway blocks 71a and 71b are placed on the base portion 74 of the required gradient on the horizontal retrograde. The upper overflow section 11 is alternately laid so as to be in a staggered arrangement. At that time, the open ends 70 and 70 of the water channel members 72 and 72 are joined together with the band-shaped water stop material 75 interposed therebetween. To do. In this joint integration, the water stop material 75 is interposed in the accommodation groove 79 formed by the matching of the adjacent notched groove-like recesses 76, 76, and the water channel members 72, 72 are mutually connected to the outer side surfaces 80, This is done by fixing the connecting piece 81 at 80. By connecting the required number of waterway members 72 in a straight line in this way, the fishway 5 having a required length formed by the fishway partition walls 1a, 1b being juxtaposed with the waterway 6 with an interval of about 150 mm is formed. Constructed and provided with a fishway structure similar to that described above. The fishway 5 can function in the same manner as described above. A plurality of rows of fishways 5 having such a configuration, for example, two rows may be adjacent to each other to form a plurality of rows of fishways.

  In FIG. 24, a plurality of, for example, two fishway partition walls 1, 1 are provided in a fixed state at a required interval, for example, about 150 mm, in one water channel member 72 in the length direction of the water channel 6. A fishway block 71 is shown. In the fishway block 71, the collision prevention cavity 45 of the other fishway partition wall 1 is opposed to the horizontal run-up section 11 of one fishway partition wall 1.

  In the fishway blocks 71, 71, the case where the fishway partition 1 is configured separately from the waterway member 72 has been described, but the fishway partition 1 and the waterway member 72 may be configured integrally. . In this case, the whole may be integrally formed with resin.

  The waterway member 72 constituting the fishway block 71 can be configured in various forms including the fishway waterway 6. Further, the joining and integration of the ends of the waterway members 72 and 72 of the fishway blocks 71 and 71 may be performed by overlapping the end portions of the waterway members 72 and 72.

  The present invention is by no means limited to those shown in the above-described embodiments, and it goes without saying that various design changes can be made within the scope of the claims. One example is as follows.

(1) FIGS. 25 to 26 show another embodiment of the fishway partition wall 1, and the fishway partition wall 1 shown in FIG. 25 has an upper portion 10 of the partition wall body 9 from one end 15 to the other end 20. An inclined portion (the inclination angle is, for example, about 32 degrees with respect to the horizontal plane) 21 is provided continuously with the other end side 20 of the upper portion 10 formed in the horizontal upper portion 22. And the part of the lower end side of this inclination part 21 is made into the sloped upflow overflow part 11, and the groove-shaped recessed part 12 of the same structure as the above is provided in this inclined upstream upstream part 11. In the present embodiment, the groove-like recess 12 is made continuous with portions other than the upstream run-up portion 11. In the same manner as described above, a collision preventing cavity 45 is provided on the side surface 41 on the downstream side of the partition wall body 9.

  As shown in FIG. 26, the upper part 10 may be configured as an inclined part 21 that inclines with a constant gradient from one end part 15 of the partition wall body 9 toward the other end part 14. Since the slope portion 21 is thus provided, the upstream run-up portion 11 having an appropriate depth is formed according to the slope angle of the slope portion 21 even when the flow rate of the channel water is increased. Become. An upper portion 27 of the inclined surface 25 on the downstream side of the groove-shaped recess 12 is formed on the downstream side of the partition wall body 9 and has an arcuate side surface projecting upward (in this embodiment, a quadrant arc-shaped side surface 29a) 29. The upper portion 31 of the inclined surface 26 on the upstream side of the groove-shaped recess 12 is formed on the upstream side surface 32 of the partition wall body 9 (in the present embodiment, the same right side surface 32a as described above) 32. It is connected to the top. In the same manner as described above, a collision preventing cavity 45 is formed on the side surface 41 on the downstream side of the partition wall body 9.

  When the fishway partition 1 is configured in this way, the upstream run-up portion 11 as the lower end side of the inclined portion 21 is formed on one end side 17 of the partition body 9 as described above. When the upstream run-up section 11 is configured as the lower end side of the inclined section 21 in this way, water channel water that overflows the upstream run-up section 11 is likely to gather on the lower end side of the inclined section 21, but the overflow state Is different from the case where the channel water overflows the overflow section 82 where no groove-shaped recess is provided as shown in FIG. In this case, the overflow condition of the channel water is a contracted overflow condition approaching one end 15 side of the partition wall body 9 as shown in FIG. On the other hand, in the present invention, since the groove-like recess 12 having the same configuration as described above is formed in the upstream run-up section 11, the case where the horizontal upstream run-up section 11 as described above is provided. If not, the water flowing into the groove-like recess 12 will flow over the upper end 27 of the inclined surface 25 on the downstream side, and will be dispersed in the length direction of the inclined portion 21 and will flow relatively. A gentle overflow condition is obtained. This makes it easy for fish to reach the groove-like recess 12 by going up the arcuate side surface 29 protruding upward.

(2) FIG. 28 shows a fishway partition wall 1 in which a central part in the length direction of the upper part 10 formed horizontally is cut off and provided with a run-up overflow part 11. A groove-shaped recess 12 having the same configuration is provided. FIG. 29 shows a fishway partition wall 1 in which a portion close to one end of the upper portion 10 is cut off and provided with an upstream overflow portion 11, and the upstream upstream portion 11 has a groove having the same configuration as described above. A concave portion 12 is provided. FIG. 30 also shows a fishway partition wall 1 in which one end side is lowered one step and the upper part 10 is horizontal and the upstream part 11 is provided at the lower part. A groove-like recess 12 having the same configuration as described above is provided.

  FIG. 31 shows another embodiment of the partition 1 for the fishway. The upper part 10 of the bulkhead main body 9 is formed horizontally, and each part of the upper part allows the fish to run upstream. 11 is provided with a groove-like recess 12 having the same configuration as described above.

  In these cases, the upper portion 27 of the inclined surface on the downstream side of the groove-shaped recess 12 is formed on the downstream side of the partition wall body 9 and has an arcuate side surface projecting upward (in this embodiment, divided into four parts). The upper side of the inclined surface on the upstream side of the groove-shaped recess 12 is connected to the upper side of the arcuate side surface 29a) 29, and the upstream side surface of the partition wall body 9 (in the present embodiment, the same as described above) It is connected to the upper part of the right side surface 32a) 32. In the same manner as described above, a collision preventing cavity 45 is formed on the side surface 41 on the downstream side of the partition wall body 9.

(3) The groove-like recess 12 provided in the upstream run-up section 11 is provided so that its bottom 23 is located at the central portion in the width direction of the partition wall main body 9 as shown in the embodiment. In addition, it may be provided in a state of being biased to the side surface 29 on the downstream side of the partition wall main body 9 or in a state of being biased to the side surface 32 on the upstream side. Further, between the upper portion 27 of the downstream inclined surface 25 and the downstream side surface 29 of the partition wall body 9, or between the upper portion 27 of the upstream inclined surface 26 and the upper portion of the upstream side surface 32 of the partition wall body 9. A small flat portion may be formed between them.

(4) In addition, the angle θ1 formed by the downstream inclined surface 25 and the upstream inclined surface 26 of the groove-like recess 12 provided in the upstream upstream section 11 is preferably approximately 90 degrees. As long as the angle is in the range of 80 to 120 degrees, it can be set as required. FIGS. 32 and 33 show cases where the angles formed by the downstream inclined surface 25 and the upstream inclined surface 26 are set to 80 degrees and 120 degrees, respectively.

  In addition, the distance between the upper part 27 and the bottom part 23 of the inclined surface 25 on the downstream side is set to 12 mm in the above embodiment, but it matches the size of the upstream fish that the fishway is intended for. It is set as required, and is set as required within a range of 5 to 30 mm in accordance with the width of the partition main body 9 in the length direction of the water channel (for example, 60 to 200 mm). 34 and 35 show cases where this distance is set to 5 mm and 30 mm, respectively.

  In addition, the inclined surface 25 on the downstream side of the groove-like recess 12 provided in the upstream run-up section 11 is formed as an inclined surface that is inclined upward toward the downstream side of the water channel 6, and the upstream The inclined surface 26 on the side is formed as an inclined surface that is inclined upward toward the upstream side of the water channel 6. However, these inclined surfaces 25 and 26 are formed as slightly upward protruding surfaces as described above. In addition to being formed, it may be formed in a straight line or may be formed as a slightly concave inclined surface.

(5) As shown in FIG. 36, the arcuate side surface 29 projecting upward on the downstream side of the bulkhead body 9 is formed as a quadrant arc-shaped side surface as shown in the above embodiment. In some cases, it is formed in a streamline shape that is long in the length direction of the water channel.

(6) Further, the side surface 32 on the upstream side of the partition wall main body 9 is formed as a quadrangular arc-shaped side surface 32b as shown in FIG. There is also. In this case, the cross-sectional shape of the partition main body 9 in the upstream run-up section 11 is semicircular.

(7) The collision-preventing cavity 45 provided on the side surface 29 on the downstream side of the bulkhead main body 9 is formed with the other end open as shown in the embodiment, and the upstream fish As long as collision can be prevented substantially satisfactorily, for example, as shown in FIG. 38, a fixing portion 87 for the water channel bottom surface 7 may be provided at the lower part of the other end of the partition wall body 9.

(8) The shape of the collision prevention cavity 45 exhibits a polygonal shape in addition to the one shown in the above embodiment as long as it can prevent the collision of the upstream fish going up the upstream upstream section 11. Also good. At that time, in order to prevent the fish that entered the collision prevention cavity from being damaged, the edge portion 52 (FIG. 10) of the opening 47 is formed on the inclined surface on which the heel side expands as described above. In addition, it may be formed in an arc shape.

(9) The fishway partition wall 1 according to the present invention may be configured not to include the collision prevention cavity 45 as shown in FIG.

(10) The bottom 23 forming the groove-like recess 12 may be formed in a non-arc shape such as a right angle as shown in FIG. Further, the continuous portions 30 and 33 may be formed at an acute angle.

(11) The fishway partition wall 1 can be constructed using various materials such as rubber, synthetic resin, wood, ceramics, etc., in addition to the above-described concrete, and the material is not limited.

(12) When a fishway is constructed by arranging the fishway partition wall 1 in the water channel 6, the interval between adjacent fishway partition walls is not specified to be about 150 mm as described above, and is adapted to the target upstream fish. Set as required. In addition, the dimensions and angles of the above-described portions of the fishway partition 1 are also set as required in accordance with the target fish. Further, when a fishway is constructed by disposing a fishway partition wall 1 formed so that one end side is lower than the other part, the upstream run-up part provided on the one end side is the same as the water channel. Sometimes placed on the side.

It is sectional drawing which shows the fishway constructed | assembled using the partition for fishways which concerns on this invention. It is the fragmentary perspective view. It is sectional drawing explaining the flow state of the channel water in a fishway, and the fish going up operation. It is the perspective view which looked at the partition for fishways from the upper side. It is the perspective view which looked at the partition for fishways from the lower side. It is the perspective view which looked at the partition for fishways from the upper side. It is explanatory drawing explaining the structure and dimension of each part of the partition for fishways. It is sectional drawing explaining the structure of the groove-shaped recessed part in the partition for fishways. It is sectional drawing which shows the partition for fishways. It is sectional drawing explaining the edge part of the opening part of a collision prevention cavity part. It is the perspective view which looked at the other Example of the partition for fishways from the upper side. It is the perspective view which looked at it from the lower side. It is sectional drawing which shows the partition for fishways in the use condition. It is a perspective view explaining the flow state of the water in a fishway. It is a top view explaining the flow state of the water in a fishway. It is sectional drawing explaining the normal water depth in a groove-shaped recessed part. It is sectional drawing explaining the overflow state of channel water in a run-up overflow part. It is sectional drawing which shows the resting state of the fish which reached | attained the groove-shaped recessed part. It is sectional drawing explaining the rising state of the water level in a groove-shaped recessed part. It is a perspective view explaining the block for fishways. FIG. It is a perspective view which shows the other Example of the block for fishways. It is a perspective view which shows the state which connected the block for fishways. It is a perspective view which shows the other Example of the block for fishways. It is the front view and perspective view which show the other Example of the partition for fishways. It is the front view and perspective view which show the other Example of the partition for fishways. It is a perspective view explaining the overflow state of waterway water in the partition for fishway which is not provided with a groove-shaped crevice. It is a perspective view which shows the other Example of the partition for fishways. It is a perspective view which shows the other Example of the partition for fishways. It is a perspective view which shows the other Example of the partition for fishways. It is a perspective view which shows the other Example of the partition for fishways. It is sectional drawing which shows the other Example of the partition for fishways. It is sectional drawing which shows the other Example of the partition for fishways. It is sectional drawing which shows the other Example of the partition for fishways. It is sectional drawing which shows the other Example of the partition for fishways. It is sectional drawing which shows the other Example of the partition for fishways. It is sectional drawing which shows the other Example of the partition for fishways. It is a perspective view which shows the other Example of the partition for fishways. It is a perspective view which shows the other Example of the partition for fishways. It is sectional drawing which shows the other Example of the partition for fishways.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fishway partition 2 Drainage channel 3 Reservoir 5 Fishway 6 Water channel 7 Water channel bottom surface 9 Bulkhead main body 10 Upper part of bulkhead main body 11 Upstream overflow part 12 Groove-shaped recessed part 17 One end part 19 Other part 20 Upper other end part 21 Inclined portion 23 Bottom portion 25 Inclined surface on the downstream side 26 Inclined surface on the upstream side 27 Upper portion of the inclined surface on the downstream side 29 Arc-shaped side surface projecting on the upper surface 29a Four-sided arc-shaped side surface 31 Upper portion of the upstream inclined surface 32 Upstream Side surface 35 Upper side surface portion 36 Lower side surface portion 37 Connection portion 39 Water storage portion 45 Collision prevention cavity portion 53 Internal cavity portion 62 Fish 63 Caudal fin 65 Tail 70 Open end 71 Fishway block 72 Waterway member 75 Waterstop material

Claims (18)

  A fishway partition that is disposed in a waterway for a fishway, and a upstream part that allows fish to run up is provided at the top of the partition body that is disposed on the bottom of the waterway so as to cross the waterway. The upstream part of the upstream part of the upstream part is connected to the middle part of the width part seen in the length direction of the water channel, and is connected upward at the bottom so as to form an angle of 80 to 120 degrees with each other. A groove-like recess is provided, which is provided with an inclined surface on the downstream side inclined to the upstream side and an inclined surface on the upstream side inclined upward toward the upstream side of the water channel, and the upper portion of the inclined surface on the downstream side is formed by the partition wall The upper part of the upstream inclined surface is connected to the upper part of the upstream side surface of the bulkhead main body, and is connected to the upper part of the arcuate side surface protruding upward on the downstream side of the main body. A partition for fishway.   A fishway partition disposed in a waterway for a fishway, and an upper part of the partition body disposed on the bottom of the waterway so as to cross the waterway is formed such that one end side thereof is lower than the other part. The upstream part that allows the fish to run up is provided on the one end side, and the upstream part of the upstream part of the upstream part of the upstream part is 80 to the middle part of the width part as viewed in the length direction of the water channel. A downstream inclined surface that is inclined upward toward the downstream side of the water channel and an upstream inclined surface that is inclined upward toward the upstream side of the water channel, which are connected at the bottom so as to form an angle of ˜120 degrees; A groove-like recess provided with a top of the inclined surface on the downstream side is connected to the upper part of the arcuate side surface protruding upward on the downstream side of the bulkhead body, and on the upstream side. A fishway characterized in that the upper part of the inclined surface is connected to the upper part of the upstream side surface of the bulkhead main body. The partition wall.   A fishway partition disposed in a waterway for a fishway, and an upper part of the partition body disposed on the bottom of the waterway so as to cross the waterway is formed such that one end side thereof is lower than the other part. The one upstream side is provided with an upstream overflow part that allows the fish to run upward, and the upward upstream part has an inclined part that gradually increases toward the other end side of the upper part. Is connected to the middle of the upstream portion of the upstream portion of the upstream portion of the upstream portion, and is connected to the bottom portion so as to form an angle of 80 to 120 degrees with each other. A groove-like recess provided with a downstream inclined surface that is inclined upward toward the side and an upstream inclined surface that is inclined upward toward the upstream side of the water channel is formed. The upper part is connected to the upper part of the arcuate side surface protruding upward on the downstream side of the bulkhead body, and the upstream side The upper end of the inclined surface, the fishway bulkhead, characterized in that it is provided continuously to the upper end of the side surface of the upstream side of the partition wall body.   A fishway partition disposed in a waterway for a fishway, and an upper part of the partition body disposed on the bottom of the waterway so as to cross the waterway is formed such that one end side thereof is lower than the other part. In addition, a horizontal upstream part that allows the fish to run up is provided on the one end side, and the upstream part is provided with an inclined part that gradually increases toward the other end of the upper part. Is connected to the middle of the upstream portion of the upstream portion of the upstream portion of the upstream portion, and is connected to the bottom portion so as to form an angle of 80 to 120 degrees with each other. A groove-like recess provided with a downstream inclined surface that is inclined upward toward the side and an upstream inclined surface that is inclined upward toward the upstream side of the water channel is formed. The upper part is connected to the upper part of the arc-shaped side surface protruding upward on the downstream side of the bulkhead body, and the upstream side Top of the inclined surface, the fishway bulkhead, characterized in that it is provided continuously to the upper side of the upstream side of the partition wall body.   5. The fishway partition according to claim 3, wherein a portion of the inclined portion closer to the upstream and upstream portion has an arc shape protruding downward.   The fishway partition according to any one of claims 1 to 4, wherein a distance between an upper part of the inclined surface on the downstream side and the bottom part is set to 5 to 30 mm.   The width of the water channel in the length direction of the partition main body is set to 60 to 200 mm, and the bottom portion is located at a central portion of the width portion of the partition main body. 4. The fishway partition according to any one of 4 above.   The upwardly projecting arc-shaped side surface connected to the downstream inclined surface presents an upward projecting quadrant arc-shaped side surface, and the downstream-side tilt is formed on the upper portion of the quadrant arc-shaped side surface. The fishway partition wall according to any one of claims 1 to 4, wherein upper portions of the surfaces are continuously provided, and the connected portions are formed in an arcuate surface protruding upward.   The upwardly projecting arc-shaped side surface connected to the downstream inclined surface presents an upward projecting quadrant arc-shaped side surface, and the downstream-side tilt is formed on the upper portion of the quadrant arc-shaped side surface. The upper part of the surface is provided continuously, and the quadrant arc-shaped side surface is divided into an upper side surface portion and a lower side portion that are vertically divided at a height of 1/4 to 3/4 from the bottom surface of the bulkhead body. Hypothesized that the lower side surface portion is a series of downwards as an extension of the quadrant arc-shaped surface at the lower end of the upper side surface portion formed in the quadrant arc-shaped surface. The fishway partition wall according to any one of claims 1 to 4, wherein the fishway partition wall is continuously provided so as to be positioned upstream of the quadrant arcuate surface.   The upstream side surface of the bulkhead body to which the upper portion of the upstream inclined surface is connected is a right side surface substantially perpendicular to the water channel bottom surface, and the upper side of the upstream inclined surface and the right side surface are The partition for a fishway according to any one of claims 1 to 4, wherein the continuous portion with the upper portion is formed in an arcuate surface protruding upward.   5. The fishway partition wall according to claim 1, wherein an upper portion of the upstream inclined surface is positioned higher than an upper portion of the downstream inclined surface.   Prevention of collision of upstream fish that goes up the upstream upstream part on the downstream side surface of the bulkhead body and located on the other end side of the upstream upstream part The fishway partition according to claim 2, 3 or 4, wherein the collision preventing cavity is provided without opening the upstream side surface.   Collision of upstream fish that travels up the upstream part on the downstream side of the bulkhead body and on the other end side of the upstream part. The collision prevention cavity is provided without opening the upstream side surface, and the upper edge height of the collision prevention cavity is set equal to or higher than the uppermost end height of the upstream run-up section. The partition for a fishway according to claim 2, 3 or 4.   14. The fishway partition according to claim 12, wherein an internal cavity that extends toward the one end is connected to the collision prevention cavity in the interior of the partition body. .   The fishway partition according to claim 12, 13 or 14, wherein the collision prevention cavity is opened at the other end of the partition body.   A fishway block, wherein the fishway partition wall according to any one of claims 1 to 15 is disposed on a fishway waterway member in a fixed state on the bottom surface of the waterway so as to cross the waterway.   A plurality of fishway partition walls according to any one of claims 1 to 15 are disposed on a fishway channel member in a fixed state on the bottom surface of the channel so as to cross the channel, and the length direction of the channel In the fishway bulkheads adjacent to each other, the anti-collision cavity of the fishway bulkhead located upstream is opposed to the upstream part of the fishway bulkhead located downstream. Block for fishway. The fishway bulkhead according to any one of claims 12 to 15 is disposed in the waterway for the fishway at a required interval in the length direction of the waterway so as to cross the waterway, and is adjacent to the length direction of the waterway. A fishway structure characterized in that, for a matching fishway partition, the collision prevention cavity of the fishway partition located upstream is opposed to the upstream part of the fishway partition located downstream. .

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