JPH0529228Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a fish ladder auxiliary device for preventing small fish from entering a waterway that takes in agricultural water from the upstream side of a river dam. .

(Prior art) Conventionally, an intake channel for agricultural water, etc. is provided on the upstream side of a river dam. A coarse bar screen and a water intake gate are installed at the entrance of the channel. Water intake is adjusted by opening and closing.

(Problem to be solved by the invention) By the way, since the bar screen explained in the above conventional example has a coarse mesh, when the water intake gate is opened to take water, small fish enter the intake channel through the bar screen. There was a problem in that the small fish continued to move downstream of the intake channel and did not return to the river, causing them to die in the intake channel.

This invention aims to improve the situation by focusing on the above-mentioned actual situation.The purpose of this invention is to protect nature by taking small fish and returning them to the river without invading the waterway, and to make the river water more effective. The object of the present invention is to provide a fishway auxiliary device that can be used.

(Means for solving the problem) In order to achieve the above object, the present invention takes the following technical measures.

That is, the present invention provides a bypass waterway that connects the upstream and downstream sides of a river dam, and the waterway is equipped with a coarse garbage removal screen at the entrance, a water control gate at the exit, and a waterway for agricultural purposes etc. in the middle. Connect the entrance of the intake canal, install a fine screen at the entrance of the canal, install a water intake gate in the intake canal downstream of the fine screen, and open the water control gate as appropriate to remove small fish and fine garbage from the river. It is distinctive in that it is made to flow down to.

(Function) According to the present invention, small fish and fine garbage that have entered the bypass waterway through the coarse waste removal screen are prevented from entering the intake waterway by the fine screen, while the water control gate is always closed. Because
The water in the Baijas canal flows into the intake canal, but small fish remain in the bypass canal, and by opening the water control gate as appropriate, the water flowing down from the outlet of the bypass canal along with fine garbage is collected on the downstream side of the river dam. will be returned to. Therefore, small fish are protected from entering the intake canal and dying, and river water can be used effectively.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In the drawing, 1 is a river, 2 is a dam on the river, 3 is a gate on dam 2, 4 is an embankment on river 1, and 5 is a side levee for fish passage between dam 2 and 4. A stepped fishway 6 is provided between the side bank 5 and the bank 4.

A bypass waterway 7 is provided on the side of the fishway 6 to connect the upstream side and the downstream side of the dam 2 approximately parallel to the fishway 6, and at the upstream entrance of the waterway 7, there is a bar screen for removing bulky debris. A normally closed water control gate 9 is installed at the downstream exit.

The middle part of the bypass waterway 7 is connected to the entrance of an intake waterway 10 for agricultural use, etc., and a fine dust removal screen, such as a mesh rotating screen, is provided at the entrance of the intake waterway 10 so as to straddle the bypass waterway 7. 1
1 is installed, and a water intake gate 12 is installed in the intake channel 10 on the downstream side of the screen 11, so that water intake can be adjusted.

The coarse garbage removal screen 8 allows fine garbage and small fish to pass through and enter the bypass passage 7, and when fine garbage accumulates, it is appropriately removed.

The water control gate 9 is for returning small fish that have entered the bypass waterway 7 to the downstream side of the river 1,
Normally, this is closed to prevent unnecessary water from flowing downstream, and the water is allowed to flow into the intake channel 10, making effective use of valuable water.

The net-type rotating screen 11 prevents small fish and fine garbage from flowing into the intake channel 10, returns the small fish to the river, and prevents them from dying in the intake channel 10. As shown in FIGS. 3 and 4, an endless strip-shaped screen body 11a is connected to a drive wheel 14 attached to a rotating shaft 13 that is supported parallel to the upper part of the bypass waterway 7, and The screen main body 11a is wound around a guide rail 15 and is configured to rotate from bottom to top at the entrance of the intake channel 10. In addition, guide rail 1
5 and the channel bottom 7a is closed by a closing plate 16.

Further, the rotating shaft 13 is driven by a drive device (for example, a motor with a speed reducer, an engine, etc.) 17 via a belt 18 or the like.

In the embodiment described above, since the water control gate 9 is always closed, by opening the water intake gate 12, small fish and fine garbage are passed from the river 1 through the coarse garbage removal screen 8 at the entrance of the bypass waterway 7 along with water. The water flows into the bypass channel 7, and the water passes through the fine rotating screen 11 into the intake channel 10 and flows down. On the other hand, small fish swim and stay in the bypass waterway 7 without passing through the fine rotary screen 11, and by opening the water control gate 9 as appropriate, the small fish are removed from the bypass waterway 7 along with water and fine garbage. It is returned to the downstream side of dam 1 and protected. Incidentally, the garbage caught on the rotary screen 11 for fine dust removal may be collected on the embankment 4.

The present invention is not limited to the above-mentioned embodiments. For example, other types of screens can be used as the fine dust removal screen 11 instead of the rotary screen, and the bypass waterway 7 is connected to the fishway 6. They can be installed on the opposite shore where there is no fishway 6, etc., without having to install them side by side.

(Effects of the invention) As mentioned above, in this invention, water is taken in from the middle of the bypass waterway through a fine screen, so small fish that have invaded the bypass waterway are returned to the river without being allowed to enter the intake waterway. It is possible to protect small fish without killing them. In addition, a normally closed water control gate is installed at the exit of the bypass waterway and opened as appropriate to return small fish to the river.
River water can be used effectively.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic plan view, Fig. 2 is an enlarged perspective view, Fig. 3 is a schematic plan view showing an example of a fine dust removal screen, and Fig. 4 is a longitudinal side view of the same. It is a diagram. 1...River, 2...Weir, 7...Bypass waterway, 8...Rough screen, 9...Water control gate,
10... Intake channel, 11... Fine screen, 12
...Water intake gate.

Claims (1)

[Scope of utility model registration request] A bypass waterway 7 is provided to connect the upstream and downstream sides of the dam 2 of the river 1, and the waterway 7 is provided with a screen 8 for removing coarse garbage at the entrance, a water control gate 9 at the exit, and a waterway for agricultural purposes etc. in the middle. The entrance of the intake channel 10 is communicated, a fine screen 11 is provided at the entrance of the intake channel 10, a water intake gate 12 is provided in the intake channel 10 downstream of the narrow screen 11, and the water control gate 9 is opened as appropriate. A fish ladder auxiliary device is characterized in that it allows small fish to flow down into a river.