JPH1161786A - Vacuum type fish way - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fish way through hole so that fish can freely communicate between up/down side of a river intercepted by a dam, by decompressing the fish way through hole arranged over the high dam by a vacuum pump to fill the through hole with static water. SOLUTION: A fish-collecting tower 1 provided with a ventilation tower 2 is installed at the river side and another fish-collecting tower 1' is installed at the dam side and both towers are connected by a fish way through hole 4 so as to stride a dam through opening/closing gates 3, 3'. The suction opening of a vacuum pump 5 is provided at the uppermost position of the fish way through hole 4. The vacuum pump 5 is driven to decompress the through hole 4 and static water is charged in the through hole 4 and the gate 3' is closed and the gate 3 is opened to conduct fish in the fish-collecting tower 1 into the fish way through hole 4. And when the gate 3 is closed and the gate 3' is opened, fish can be transferred from the river side to the dam side and when the gates are reversely operated, fish can be transferred from the dam side to the river side. And hence, fish can be freely transferred between the dam and the river cut off by the dam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decompression type fishway, and more particularly, to a fish collection tower provided upstream and downstream of a bank installed in a river or the like. The present invention relates to a fish-friendly fishway, which is connected by a fishway through hole having an opening / closing gate and allows the fish to freely move up and down by the operation of the vacuum pump and the opening / closing gate.

[0002]

2. Description of the Related Art Fish such as rivers keep their natural system by going up and down rivers and the like. But 3 fish
It is said that when there is a height difference of 0 cm or more, that is, when there is a fluctuation in the water level, it is impossible to go uphill. Therefore, when a dike is installed in a river, etc., fish downstream cannot go upstream over this dike, and many fishways have been proposed and implemented to solve this problem. Have been. There are two types of fishways that have been proposed so far: fixed fishway and movable fishway. The former is often used in places with small fluctuations in water level. The canal has a gentle structure, and the guiding wall type (this is a structure in which the guiding wall protrudes alternately from the left and right end wall surfaces to the center of the canal so that the water flowing through the canal meanders. ), Stepped fishway (this is a structure in which multiple weirs are arranged in a waterway in a stepwise manner, so that water flowing in the waterway overflows each weir, and fish So that you can go up),
There is a backflow fishway (this has a structure in which a wall is provided in the middle of a waterway to generate backflow of water).

On the other hand, a movable fishway is provided in a place where the water level fluctuates greatly, and the type thereof is a downturned fishway (this is a waterway constituting a fishway, in which a plurality of gates are provided so as to fall to the downstream side. Structure), an upside-down fishway (this is a structure in which a plurality of gates are provided so that they can fall over the waterway that constitutes the fishway, so as to compensate for the low water level of the downturned fishway. Up-and-down fishway (this is a structure in which a plurality of gates are provided in the waterway constituting the fishway so as to be able to move up and down), and lock-type fishway (this is provided in the waterway constituting the fishway) The gate has a structure that can be opened and closed alternately, and an elevator-type fishway (this is provided with an elevator that puts fish in the middle of the waterway that constitutes the fishway, and raises the fish to a high water level at once. )etc A.

[0004]

As described above, in a place where the height difference is small, that is, in a place where the water level fluctuation is small, a fixed type fishway such as a plane type fishway, a guided wall type fishway, a step type fishway, or a reverse type fishway is used. Well used, no major problems. However, movable fishways, such as a downturned fishway, an upside-down fishway, an up-and-down fishway, a lock-type fishway, and an elevator-type fishway, which are installed in places with large fluctuations in water level, generally have large facilities. Therefore, it has disadvantages such as a large space requirement, a high equipment cost, and a very troublesome operation and maintenance. More specifically, the problems of each of the conventional movable fishways will be described. Since the downstream overturned fishway and the upstream overturned fishway have to be provided with a number of gates whose height is gradually reduced from upstream to downstream ( (The heights of the gates are all different.) In order to prevent the gates from hitting each other, a considerably long distance is required in the flow direction of the water channel, so that the equipment becomes large and the equipment cost increases.

[0005] In addition, the lifting fishway also requires a large number of large gates and gates having different heights, and each of the gates requires equipment for lifting and lowering the height. Get higher. The size of the gate used in the lock-type fishway is very large, and the two gates installed in the waterway need to be lifted up and down in a well-balanced manner while considering the run-up of the fish. It is troublesome. In addition, the elevator-type fishway is considerably expensive in terms of facilities, and also requires sufficient care in running up the fish, which is extremely troublesome.

[0006]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of intensive studies on fishways which do not have the above-mentioned problems. In other words, the present invention provides a fish collection tower for collecting fish upstream and downstream of a bank installed in rivers and the like,
The two fish collection towers are connected by a fish passage through the dam, and the fish passage can be passed by alternately opening and closing a vacuum pump for filling the still water by decompression and opening and closing. A decompression-type fishway provided with two opening / closing gates as described above, wherein the upstream and downstream fish of the weir can be freely moved up and down by operating both gates and a vacuum pump. It is.

[0007] The present invention has solved all the problems of the conventional movable fishway installed in a bank with large water level fluctuation. In other words, the present invention enables fish to be easily moved from a downstream side to an upstream side or from an upstream side to a downstream side by a simple operation even in a tall embankment. In addition, although the fishways proposed and implemented so far have been intended only for ordinary so-called upstream fish, the decompressed fishway of the present invention is not limited to fish living in rivers and any other organisms (or fish). , Shrimp, rainbow, etc.) can freely move up and down over the embankment. Furthermore, since the decompression type fishway of the present invention does not become large-scale in terms of equipment, it has an advantage that it can be considerably reduced.

[0008]

1 is a plan view of a partially cut-out decompression type fishway according to the present invention, and FIG. 2 is a sectional view taken along the line Y--Y of FIG. First, a fish collection tower (1) having a ventilation tower (2) downstream of the tall embankment (river) and a fish collection tower (1 ') were installed upstream (dam). These two fish towers (1),
(1 ') is connected by a fishway through hole (4) while straddling the dam, and two opening / closing gates (3) near the two fish collecting towers (1) and (1'); (3 ') is provided.

In addition, a suction port of a vacuum pump (5) is provided in the middle of the fish passage hole (4) so that the inside of the fish passage hole can be reduced in pressure. With the above facilities, the downstream side of the dam (river)
Fish to the upstream side (dam) or the fish upstream of the dam (dam) to the downstream side (river). The operation method is as follows. First, the vacuum pump (5) is operated to operate the fishway. The opening of the opening / closing gate (3) and the opening of the opening / closing gate (3) for the fish of the river that has been filled with still water in the through hole and led into the fish collecting tower (1) are opened, and the fishway opening ( 4) After leading inside,
The opening / closing gate (3) is closed and the opening / closing gate (3 ') is opened to move the fish in the fishway passage hole (4) to the upstream side (dam).

On the other hand, in order to move the fish upstream (dam) of the dam to the downstream (river), the opening and closing gate (3) is closed while operating the vacuum pump (5). (3 ') is opened, and the fish led into the fish collection tower (1') on the upstream side of the weir is led to the fishway passage (4), and then the opening gate (3 ') is closed. The opening gate (3) is opened to move the fish in the fishway passage (4) to the downstream side (river). The vacuum pump (5) and the opening gate (3) as described above,
By automatically repeating the operation (3 '), the fish on the downstream and upstream sides of the bank can be smoothly moved up and down without causing any damage.

[0011]

As described above, according to the present invention, fish downstream or upstream of a tall dam are collected by a fish collecting tower provided downstream or upstream of the dam and these two fish collecting towers are straddled over the dam. It can be freely moved up and down by the operation of two gates attached to the fishway through hole and the vacuum pump through the fishway through hole which is connected in a state, and the fish can be vigorously moved upstream or downstream of the high dam according to the present invention. You can now go up and down. The equipment used in the present invention is smaller in size and has a simpler structure than the conventionally proposed movable fishway, so that it is easy to operate, and is low in cost and hard to break down.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a reduced-pressure fishway of the present invention.

FIG. 2 is a cross-sectional view taken along line YY of FIG.

[Brief description of reference numerals]

 1 Fish collection tower (installed on the downstream side of the weir) 1 '上流 (Installed on the upstream side of the weir) 2 Ventilation tower 3 Open / close gate (attached near the fish collection tower on the downstream side of the weir) 3' 〃 (fish collection on the upstream side of the weir (Attached near the tower) 4 Fishway passage 5 Vacuum pump

Claims (1)

[Claims] 1. A fish collecting tower for collecting fish is provided upstream and downstream of a bank installed in a river or the like, and the two fish collecting towers are connected by a fishway through hole while straddling the bank.
This fish passage hole is provided with a vacuum pump for filling the still water with reduced pressure and two opening / closing gates which allow the fish to pass by opening and closing alternately. A decompression-type fishway characterized in that fish upstream and downstream of the weir can be freely moved up and down by operating a pump.