JPH11200350A - Automatic fish way gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a fish way having a dam by making a detour meet with variations in the water level of the upstream, stably supply a slope of the fish way and, at the same time, to provide an automatic fish way gate capable of simplifying civil engineering structure. SOLUTION: A joint arm 10 extending in the direction of a stream is provided upward of a fish way equipped with a partition walls 7 and 8 in a turnable manner of pivoting on the end of the downstream, at the same time, a plurality of door bodies 9 hanging on the joint arm 10 are provided to the downward partition walls in a slidable manner, and a float 13 floating in a float chamber 17 provided to the upstream side of the fish way is suspended to the end of the upstream of the joint arm 10. By lever structure of the joint arm 10, operation force is increased to make it possible to raise and lower the door bodies 9, and the float 13 can be miniaturized. By the constitution, a simply automatic fish way gate 5 can be obtained. Water in the upper layer of the upstream is made to flow into the float chamber through a water pouring dam, the water in the float chamber is discharged to the downstream of the fish way through an outlet pipe to increase operation force of the float, and the accuracy can be promoted by the small float.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art In recent years, fishways have been provided in dams, weirs, and the like, but those designed for a case where the water storage level is constant have been constructed. The present invention relates to an automatic fishway gate that can cope with a fluctuation in the water level.

[0002]

2. Description of the Related Art Conventionally, a dam or a weir is provided in a river or a waterway for the purpose of flood control or water use, and a fish passage is provided for fish to run up and down by bypassing the dam or the weir. Therefore, the fishway has a large difference in water level between the downstream mouth and the upstream mouth, so that the fishway is generally provided with a gradient suitable for the fish so that the fish can easily go up or down, and a plurality of bulkheads are provided in the waterway. The structure is provided at intervals. Then, the water flow of the pool formed between the partition walls is configured to flow into the next pool at a certain head (overflow water depth).

[0003] The water level raised by a dam or a weir often fluctuates, and it is difficult for fish to run up and down in a waterway in which the height of the partition wall is determined, such as during drought or flood. It may be. For this reason, a fishway gate is provided so that fish can go up and down at all times or for a certain period in response to fluctuations in the water level. There are two types of fishway gates: one that uses the power of an electric motor or the like, and one that uses a float.If the fishway to be installed in a dam or weir is a location that is difficult to maintain and manage geographically, an automatic fishway gate using a float is used. Has been applied.

[0004] As a fishway gate using a float, a door with a float is attached to each partition, and the float with respect to the fluctuation of the water storage level is set so that each of the plurality of partitions with a door has a constant head. A fishway gate is used in which the height of the bulkhead (wall + door) is automatically adjusted. There is also a fishway in which a plurality of partition walls are connected by a floor plate, the downstream side of the floor plate is pivotally supported, the floor plate is floated by a float, and the float is raised or lowered by a change in water level to make the floor plate with a partition wall suitable for fish. .

[0005]

However, in the above-described conventional bulkheads with a plurality of doors, each of them operates independently, and the interlocking of the doors is not sufficient, so that the head is not stable. . In addition, a float and a civil engineering structure for the float are required for each partition, and the construction work becomes very complicated. In addition, even if only one partition is used as an example, when the float is configured to obtain the opening / closing force of the door by the change in buoyancy due to the fluctuation of the water level, the buoyancy of the float is more than the case of using the lever or the difference in water level between the upstream and downstream. Must be increased, which is uneconomical. Alternatively, if the size of the float is not sufficient, the accuracy is reduced, and the flow rate or the water level difference in the fishway cannot be maintained optimally. However, in the case of a float structure using a lever or a water level difference between the upstream and downstream, the interlocking of the doors does not work. Further, in a fishway in which the above-mentioned floorboard with a partition wall is rotated about the downstream side, a large float must be installed at the lower part of the floorboard, and a recess for accommodating the float in the riverbed must be made, which is a large scale.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic fishway gate with a simplified civil engineering structure by supplying a fishway capable of coping with fluctuations in the upstream water level.

[0007]

In order to achieve the above object, according to the present invention, a connecting arm extending on a plurality of partition walls is provided on a fishway having a plurality of partition walls at intervals. The downstream end is pivotally provided, and the door body is provided so as to be rotatable. The door body is provided on the partition below the connection arm so as to slide vertically, and each door body is suspended from the connection arm. A float floating on the upstream side is suspended from the upstream end.

According to a second aspect of the present invention, in the first aspect of the present invention, the float connected to the upstream end of the connecting arm is provided.
It is housed in a float chamber provided in the upstream of the fishway, a water injection weir is arranged near the door provided in the uppermost stream, and the lower discharge port of the water injection weir communicates with the float chamber. An outflow pipe communicating with the fishway downstream is provided.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 2, a fishway 3 is provided bypassing a weir (or dam) 2 that closes a reservoir (or waterway) 1, an upstream port 4 of the fishway 3 is provided upstream of the weir 2, and a fishway 3 is provided. Automatic fishway gate 5 on the upstream side of
The downstream side is a fixed fishway 6.

As shown in FIGS. 1A and 2, the automatic fishway gate 5 is a sliding type which can be moved up and down to the most upstream partition 7 of the fishway 3 and a plurality of partitions 8 downstream thereof. The doors 9 are attached to each other, and each door 9 is connected to a connecting arm 10 extending upward in the water flow direction via a connecting rod 11 so as to be integrally provided. The connecting arms 10 are paired and connected by connecting pins 12, and the upstream side of the connecting arm 10 is connected to a float 13 described later.

In the fixed fishway section 6 on the downstream side of the fishway 3, the height of the partition wall 8 a is increased toward the upstream side, but the most upstream partition wall 7 of the automatic fishway gate 5 and the plurality of partition walls 8 on the downstream side are formed by a door body. Since each of the partitions 9 is provided, each partition 7 and 8 is constructed at the same height. The connecting arm 10 has a downstream end pivotally supported and pivots upstream. The suspended door body 9 is gradually enlarged from the downstream side, and the most upstream door body 9 is largest. Have been. Thereby, even if the door body 9 moves up and down, it does not separate from the partition walls 7 and 8.

As shown in FIG. 1B, the sliding door 9 has watertight rubber 14 attached to the lower end and both lateral ends, and a roller 15 is provided between the sliding doors 9 and 8. Both ends of the connecting rod 11 are pivotally supported by pins 12 and are rotatably mounted on the connecting rods 11 so that the elevation of the door 9 does not interfere with the angle θ of the connecting arm 10. When the connecting arm 10 is in the horizontal state, the partition walls 7 and 8 and the door 9 are arranged at the same height. As shown in FIG. 1A, a stopper 16 may be provided on the side wall so that the inclination of the connecting arm 10 does not exceed the upper limit, and the roller 15 provided on the door body 9 may be provided only at the lower end.

Further, float chambers 17 are provided on both sides of the upstream side of the automatic fishway gate 5, and are generally in communication with the reservoir 1, and the floats 13 accommodated in the float chambers 17 are provided.
Are connected to the upstream sides of the two connecting arms 10 by a suspension arm 18 and a π-shaped support member 19.

As described above, the float 13 is arranged on the upstream side of the fishway 3 where the fluctuation of the water level which causes the change of the buoyancy of the float 13 can be utilized to the maximum, and the float 13 is suspended at the most upstream part of the connecting arm 10. Since the operating force can be reduced by the leverage structure of the connecting arm 10, the float 13 can be reduced, and the civil structure becomes simple and economical. Further, since all the doors 9 are suspended from the connecting arm 10, it is not necessary to provide the floats 13 on each of the doors 9, and all the doors 9 can be reliably operated by the leverage structure. When the upstream water level rises, the water level of the float chamber 17 rises, so that the float 13 rises, and each door 9 slides upward at a respective ratio. As a result, a fishway 3 having a constant head is formed, and the fishes run up and down. Further, when the upstream water level becomes low, as shown in FIG. 3, each door body 9 comes to overlap with the partition walls 7 and 8.

Next, the vicinity of the float chamber 17 will be described in detail. Since the float chambers 17 are provided symmetrically on both sides upstream of the automatic fishway gate 5, one of them will be described with reference to FIG. As shown in FIGS. 2 and 4, screens 20 are stretched on both sides of the upstream mouth 4 of the fishway 3, and a partition wall 7 and a door 9 on the most upstream side are provided in the center. The inside of the screen 20 is surrounded by the screen 20 and is filled with water.
1 is formed, and a water injection weir 22 suspended from the connection arm 10 is disposed in the water injection tank 21. Further, a float chamber 17 is provided so as to be connected to the water injection tank 21, and the float 13 is accommodated therein.

The weir 22 and the float 13 are composed of a π-shaped support member 19 attached to the connecting arm 10 and the suspension arm 1.
8, the water injection weir 22 is composed of an annular weir 23 and a flexible pipe 24 provided at the central bottom discharge port, and the flexible pipe 24 is connected to the bottom of the float chamber 17.
The overflow water of the water injection weir 22 flows into the float chamber 17. Also, the suspension arm 18 of the water injection weir 22 may be made of a wire by making the water injection weir 22 sufficiently heavy to overcome buoyancy. The left and right float chambers 17 are connected to each other by a communication pipe 25 connecting the bottoms to eliminate the structural error of the water injection weir 22 and to remove the left and right float chambers 1.
The water surface of 7 is the same. An outflow pipe 26 is connected to the float chamber 17, extends to the fishway fixing portion 6, and is opened by an outflow hole 26a.

The operating force of the float 13 is a value obtained by multiplying the flat area of the float 13 by the water level difference of the float chamber 17. When the water storage level rises slightly, the float 13 flows into the float chamber 17 due to inflow from the weir 22. The water level rises and a large upward operating force is obtained. Conversely, when the water storage level drops slightly, the inflow from the water injection weir 22 decreases, the outflow from the outflow pipe 26 relatively increases, and the water level in the float chamber 17 decreases,
A large downward operating force can be obtained. As described above, the water level of the float chamber 17 is largely changed by the inflow from the water injection weir 22 into the float chamber 17 and the outflow from the outflow pipe 26, and the operating force of the float 13 is increased, thereby further reducing the float 13. The operation accuracy can be greatly improved. Further, since the weir 22 is attached near the door 9 provided at the uppermost stream, the positional relationship between the uppermost door 9 and the water storage level is always kept constant. Is always kept constant, and the operation accuracy is improved.

[0018]

According to the present invention, a float is provided on the upstream side of the fishway and connected to the upstream side of the connecting arm, and is rotatable around the downstream end of the connecting arm. Because of this, the leverage structure of the connecting arm can increase the operating force, move up and down the plurality of doors, and reduce the float. This allows
A simple automatic fishway gate with a stable gradient is obtained. In addition, the flow of water in and out of the float chamber containing the float is performed by using a weir and an outflow pipe, thereby increasing the fluctuation of the water level, increasing the operating force of the float and increasing the operating accuracy, and further reducing the float. can do.

[Brief description of the drawings]

FIG. 1 illustrates an automatic fishway gate according to the present invention (a).
It is a sectional view of a full length and (b) a door body part.

FIG. 2 is a plan view of the automatic fishway gate shown in FIG.

FIG. 3 is a sectional view when the upstream water level of the automatic fishway gate shown in FIG. 1 is low.

FIG. 4 is a cross-sectional view around the float of the automatic fishway gate shown in FIG. 1;

[Description of Signs] 5 Automatic fishway gate 7, 8 Partition wall 9 Door body 10 Connecting arm 13 Float 17 Float chamber 22 Water injection weir 26 Outflow pipe

Claims (2)

[Claims] 1. A fishway provided with a plurality of partition walls at intervals, a connecting arm extending over the plurality of partition walls is rotatably provided around a downstream end thereof, and a door is provided on each of the partition walls below the connecting arm. Body is provided so as to slide in the vertical direction, each door body is suspended from the connection arm, and at the upstream end of the connection arm,
An automatic fishway gate characterized by hanging a float floating upstream. 2. A float connected to the upstream end of the connecting arm is housed in a float chamber provided in an upstream portion of the fishway, and a weir is disposed near a door body provided in an uppermost stream portion.
2. The automatic fishway gate according to claim 1, wherein a lower discharge port of the water injection weir communicates with the float chamber, and an outflow pipe communicating from the float chamber to a fishway downstream is provided.