JPH06116931A - Fishway opening and closing device - Google Patents

Abstract

PURPOSE:To enable execution of the free passage of fishes by a method wherein an openable cover having holes through which a gentle water flow is generated by causing a branched water flow passing in a small pipe to flow into a large pipe is mounted on a fishway pipe. CONSTITUTION:By bringing a perforated induction cover 3 into an opened state and a perforated discharge cover 4 into a closed state, water is brought into a gentle stream state. After fishes are guided in a fishway pipe 1, the perforated induction cover 3 is closed. Further, the perforated discharge cover 4 is opened and fishes are discharged to an upper stream spot. This constitution enables the free passage of fishes from sea to the upper stream side of a river.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] The openable fishway device of the present invention was installed in a place where fish could not move upstream or downstream, such as by a weir, and was developed to allow fish to freely pass through the fishway pipe. It is a thing.

[0002]

2. Description of the Related Art Conventionally, there is a staircase type, but small fast-moving fish such as sweetfish can climb, but large fish and slow-moving fish cannot climb by the staircase type.

[0003]

[Problems to be Solved by the Invention] It is installed in a place where fish cannot go up or down by a weir or a dam made in a river so that fish going down to the sea or going upstream can freely come and go. As such, it was developed.

[0004]

[Means for Solving the Problems] (1) Fishway tube, (2) Fishway box, (3) Perforated guide lid, (4) Perforated discharge lid, and an openable fishway device having the above configuration.

[0005]

[Operation] First, (3) the perforation guide cover is opened so that the fish can go up by installing the openable fishway device on a weir or the like, and (4) the perforated discharge cover is closed during that time. The flow is slow. In the meantime, introduce the fish into the fishway tube, and at intervals, (3) close the perforated guide lid,
After that, (4) the perforated discharge lid is opened and the fish are discharged upstream. Also, the fish that descend during this time can enter the fishway tube. It is possible to release the fish downstream by (4) closing the perforated discharge lid, and then (3) opening the perforated guide lid after a time interval. During this time, the fish that climb upstream enter the fishway pipe. By repeating this opening and closing, the fish can freely move back and forth inside the fishway pipe installed on the weir.

[0006]

EXAMPLE An example of the present invention will be described. (3) When the piercing guide lid opens, (2) guide the fish to the fishway tube and the fish enters, (3) close the piercing guide lid, and then (4) open the piercing discharge lid to open the fish. Is discharged upstream.
(3) The perforation guide lid is closed first because the pressure of the water flow from the upstream is applied so that the fish entering the fishway pipe will not flow with a strong water flow, and (4) the perforation discharge lid. To make it easier to open. An automatic opening and closing type fishway device that automatically repeats this opening and closing.

[0007]

[Effects of the Invention] Although various fish live in the river, such as fish that once go down to the sea and then climb up to the river, many rivers are blocked by fish such as weirs and dams. By installing this retractable fishway device in such a place, fish will be able to move freely from the sea to the upstream of the river, if not the original river where weirs and dams were not there. It is an open and close fishway device developed.

[0008]

[Brief description of drawings]

[Fig. 1] Perspective view with fishway box

[Fig. 2] Part of fishway tube and perforated guide lid

[Fig. 3] Partial perspective view of a half section of a fishway tube and fishway box.

[Fig. 4] Partial perspective view of the fishway pipe discharge lid.

[FIG. 5] Partial half cross-sectional perspective view when the discharge lid is opened.

[Explanation of symbols]

 (1) Fishway tube (2) Fishway box (3) Perforated fish guide lid (4) Perforated fish release lid

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[Procedure amendment]

[Submission date] September 23, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

[Fig.1] Perspective view of fishway tube with fishway box

[Figure 2] Half-section perspective view of fishway tube, fishway box, and discharge lid

[Fig. 3] Partial judgment surface perspective view when the discharge lid is opened

[Explanation of code] (1) Fishway tube (2) Fishway box (3) Perforated guide lid (4) Perforated discharge lid

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 1]

[Fig. 2]

[Fig. 3]

Claims (4)

[Claims] 1. An open / close type fishway tube having an openable / closable lid attached to the fishway tube, the opening having a hole for creating a gentle water flow by flowing a large amount of water flow into the small tube. 2. A box-shaped (2) fishway box is installed in order to (1) open the lid on the downstream side of the fishway tube, and opens and closes with a hole for inviting fish while allowing a certain amount of water to flow. Formula (3) Attach a perforated guide lid, (1) Attach an openable / closable (4) discharge lid that also has a hole for flowing water on the upstream side of the fishway pipe. 3. A discharge lid having a plurality of holes on the upstream side (4). 4. A fishway pipe using a soft pipe that can be installed over the upper part of the weir or dam when the fishway pipe is installed.