JPH0529227Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fishway device installed in a dam to allow fish to ascend from a downstream waterway into a dam reservoir.

(Prior technology) Traditionally, this type of fishway was constructed by forming a gently sloping, step-like waterway attached to a dam from the top of the dam to the water surface downstream, and by constructing a small weir in stages. A staged fishway is formed, or a gently sloped slope is formed from the top of the dam to the downstream water surface,
There is a slope-type fish ladder with shield walls protruding in a staggered pattern at appropriate locations to reduce the force of flowing water and allow fish to ascend.

(Problems to be solved by the invention) By the way, since the above-mentioned conventional fishway is constructed in a river, construction is carried out during the dry season, and moreover, it is carried out directly on site by pouring concrete, etc. The problem is that it takes a long time to complete.

In addition, since the purpose of fish ladders is to allow fish to climb up on a gentle slope, they require a large amount of space in terms of planes, resulting in huge construction costs, which increase as the size of the dam increases. .

The present invention was devised in view of the above-mentioned actual situation, and its purpose is to easily and economically construct existing dams in a relatively short period of time.
An object of the present invention is to provide a fishway device that can save space in a plane.

(Means for Solving the Problems) In the present invention, the following technical measures were taken in order to achieve the above object.

That is, the present invention connects a fishway conduit that penetrates the dam body and is arranged along the slope on the back side of the dam body to the lower water inlet of the overflow control gate provided inside the dam body, The present invention is characterized in that a gate is provided at the downstream end of the fish passageway, and a plurality of transparent or semi-transparent light fixtures and fish reservoirs are provided in the middle of the pipeline.

(Operation) According to the present invention, first, the inlet gate at the downstream end is opened to guide fish into the lower end of the fishway pipe, and then the inlet gate is closed, and the dam storage water is gradually overflowed from the overflow adjustment gate. The water level inside the fishway pipe will gradually rise. The fish climb up the fishway conduit while resting on the water surface and in the fish pool, and reach the inside of the gate from the water inlet of the overflow adjustment gate. Then, as the water level inside the regulating gate rises, the fish also rise, and when the water level inside the regulating gate becomes approximately the same as the dam storage water level,
Fish enter the dam water storage area and ascend upstream.

In this way, when the fish have completed their ascent, the overflow control gate is closed (raised), the inlet gate is opened to release the water in the fishway pipe downstream, and the above operation is repeated again, allowing the fish to rise. Aiming to improve.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In the drawing, 1 is a dam body, 2 is a dam water storage, and 3 is a multistage overflow adjustment gate provided in the front water storage of the dam dam body 1. The gate 3 consists of a surface intake gate with a semicircular door body 4 that is vertically expandable and retractable, and is configured to be movable up and down by an opening/closing device 5 installed on the dam body 1.
The surface water of the dam overflows from the upper edge of a.

Reference numeral 6 denotes a fishway pipe, and a horizontal pipe 6a at the upper end is inserted and fixed into a horizontal hole 7 that is provided through the dam body 1 and opens at the lower end of the gate 3 at the upstream side.
The upstream end of the gate 3 is connected to the water inlet 8 of the gate 3. The fishway pipe 6 includes a steel horizontal pipe 6a, an oblique pipe 6b, vertically curved pipes 6c and 6d, and a lower end inlet pipe 6e.
It is composed of a plurality of light beams 9 made of transparent synthetic resin pipes (for example, acrylic pipes), and are connected to each other by flange joints 6f. and,
Each of the vertically bent pipes 6c, 6d and the oblique pipe 6b has a fish reservoir 10 projecting downward, a drain pipe 11 is connected to the lower end of each fish reservoir 9, and an on-off valve 12 is connected to the outlet of each drain pipe 11. is provided.
In addition, 13 is a tube support stand.

The lower end inlet pipe 6e and the light fixture 9 connected thereto are made larger in diameter than other pipes to form a fish reservoir 10a, and the lower end inlet pipe 6e
The entrance has a reduced diameter and is provided with a slide gate 14. Further, an air vent pipe 15 is provided above the lower end inlet pipe 6e, and an on-off valve 16 is provided in the air vent pipe 15.

Reference numeral 17 denotes a slide gate opening/closing machine, which is installed on the frame 18 and folded so that it can be operated on the frame 18 together with the air vent opening/closing valve 16.

Reference numeral 19 denotes a priming pipe, the upper end of which is located near the water inlet 8 of the gate 3 and provided with a priming on-off valve 20, and the lower end of which opens into the water channel 21 below the lower end inlet pipe 6e. The priming on-off valve 20 is operated from above the dam body 1.

22 is a lighting device for guiding fish.

In the above-described embodiment of the present invention, when fish are to be brought up, the slide gate 14 is first opened, the priming on-off valve 20 is opened, and the priming pipe 19 is opened.
The water stored in the dam is discharged into the waterway 20, fish are guided into the lower end inlet pipe 6e and collected in the fish reservoir 10a, and then the slide gate 14 and the on-off valve 20 are closed. Next, the overflow adjustment gate 3 is lowered slightly to allow the dam surface water to overflow into the gate 3, and the fishway pipe 6
The water level inside the tank will gradually rise. The fish are guided up by the light 9 while resting in the fish basin 10 along with the water surface inside the fish passage pipe 6, reach the overflow adjustment gate 3 through the water inlet 8, and as the water level inside the gate 3 rises, the fish When the water level within the gate 3 reaches approximately the same level as the dam storage water level, the fish reach the dam storage area and ascend upward. In this way, when the fish have completed their ascent, the overflow adjustment gate 3 is raised to stop the overflow, the slide gate 14 is opened, the water in the fish passage pipe 6 is discharged downstream, and the above-mentioned process is again carried out. By repeating the operation, you can try to raise the fish.

Note that the overflow adjustment gate 3 is not limited to a semicircular multistage gate, but can be a cylinder gate, a multistage gate, etc. Also, the priming pipe 19 is omitted and the fishway pipe 6 is also used for priming. be able to.

Furthermore, the present invention is not limited to the above-mentioned embodiments; for example, instead of using a synthetic resin pipe, the illumination 9 may be formed by providing an opening in a part of a steel pipe or the like and closing it with a transparent plate or a semi-transparent plate. It can be used as a light fixture.

(Effects of the invention) Since the present invention has the above-mentioned configuration, the planar installation space can be reduced, and the fishway pipe 6 can be manufactured in a factory, and the pipe installation work can be carried out on site.
This involves drilling a horizontal hole in the dam body and installing an overflow gate, and it can be easily constructed on an existing dam in a short period of time.Furthermore, the fishway conduit on the back side of the dam body can only be used during the dry season. It is possible to save construction costs and gain economic benefits.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a central vertical sectional view, and FIG. 2 is a left side view of FIG. 1. 1... Dam embankment body, 3... Overflow adjustment gate, 6...
...Fishway pipe, 8... Water inlet, 9... Lighting, 1
0,10a...Fish pool, 14...Slide gate.

Claims (1)

[Scope of utility model registration request] A fishway pipe that penetrates the dam body and is arranged along the slope on the back side of the dam body is connected to the lower water inlet of the overflow control gate provided inside the dam body, and the downstream of the fishway pipe is A fishway device characterized in that a gate is provided at a side end, and a plurality of lights and fish pools made of transparent or translucent materials are arranged in the middle of the pipe.