JPH089218Y2 - Fishway device for movable weir - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is intended to be installed in a steel structure floodgate facility among floodgate facilities consisting of civil engineering structures and steel structures that are installed across rivers and the like. The present invention relates to a fishway device for a movable weir.

(Prior art) Generally, due to reasons such as the use of water, it does not interfere with the flow of running water such as a fixed weir made of concrete or the like as a structure that crosses rivers and blocks river water. A movable weir or the like having a function of moving or turning down is provided. When installing movable weirs etc., make a running water passage between the upstream and downstream separated by these structures,
Many fishways have been established to facilitate the ups and downs of fish.

In recent years, as a structure for a weir, a movable weir of an elevating type or a falling type is mainly used due to reasons such as safety in flood control and securing a site. An example of the elevating movable weir, as shown in FIG.
Concrete weir pillars 2 are erected at predetermined intervals across the river, and weir bodies 3 are erected vertically between the weir pillars 2. The weir body 3 is raised and lowered on the weir pillars 2. An operation room 5 accommodating a hoisting machine 4 is installed.

In addition, it is included in the water flow section determined by calculating the flood volume of this river (refers to the lower section of the river shown in Fig. 3 within the river bounded by the dotted line and further divided by HWL). As much as possible to reduce the civil engineering structures that remain as equipment,
In addition, because the fishway is installed as a civil engineering structure that projects above the riverbed, its location should be outside the cross section to prevent scouring of the riverbed material due to running water. In addition, it is often installed near the embankment of the dike where the flow velocity is relatively slow.

In FIG. 3, a concrete wall 6 is built on the riverbank, and a further space is provided between the weir pillar 2 and this part, which connects the upstream side and the downstream side of the movable weir 1. It is said to be a fish path 7 for fish and the like. The fishway 7 is composed of a plurality of partitioned tanks 8 that rise stepwise from downstream to upstream with a height difference within the range where fish can go up. Has been done. Fish or the like can be run up or down through running water that overflows over each partition, or through a hole or the like provided through the partition.

(Problems to be solved by the invention) As described above, although the structure of the fishway is simple, it is preferable to have a wide river near the fishway installation point. In places where there is no fishway, as shown in FIG. 3, a fishway is installed on the riverbank, which causes problems such as the expansion of the river width near the fishway installation point, the complexity of the civil engineering shape, and an increase in construction costs. Therefore, when constructing a movable weir, it was desired to be able to install fishways sufficiently even in places where the river width is narrow.

An object of the present invention is to provide a fishway device for a movable weir, which uses a part of the weir body of the movable weir as a fishway.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a movable weir having a weir body that is constructed so as to be able to move up and down so as to cross the river. A fishway with a plurality of tanks arranged in a stepwise manner in the transverse direction was provided, a dowel opening leading to the upper portion of the fishway was provided upstream of the weir body, and a discharge opening leading to the lower portion of the fishway was provided downstream of the lower portion. Is characterized by.

(Operation) Since the present invention is configured as described above, the upstream water is stored by the weir body, and the overflowed water flows down from the dowel and is discharged while storing the running water in a plurality of staircase-shaped tanks. It flows downstream from the outlet. Run-up fish enter from the outlet,
It is possible to go upstream through multiple tanks along this flow. In addition, the fish that flow down can go downstream with running water.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the movable weir 9 provided across the inside of the river is slidable vertically between the weir pillar 10 and the weir pillar 10 which is erected at appropriate intervals in the direction crossing the river. Weir body attached to
The weir body 11 comprises a wire rope wound around an electric hoisting device 13 installed in an operation room 12 provided on the weir pillar 10.
Connected to 14. A fishway may be provided along the outside of the weir body 11, but in the present embodiment, an apparatus having a fishway inside the weir body 11 will be described below.

This weir body 11 is made of steel material, and as shown in FIGS. 1 and 2, a weir body 11 is provided on the upper upstream side of the weir body 11 and opens on the upstream side of the weir body, and on the lower downstream side thereof. A partition plate 17 is provided which is provided with a discharge port 16 opening to the downstream side, and the top of which is lowered stepwise from the dovetail 15 to the discharge port 16 inside the weir body 11.
Is provided with a fishway 19 consisting of a plurality of continuous tanks 18. In addition, the floor plate 20 is provided in each tank so that the running water accumulated in the plurality of tanks 18 does not increase in weight when the weir body 11 is moved up and down.
It is provided corresponding to 18.

In addition, a screen for dust prevention around the drinking mouth 15
A plurality of lighting windows 22 are provided on the upper surface of the weir body 11, and a device through which fish can pass with peace of mind is attached if necessary. In addition, a plurality of upper plates 23 are continuously stretched upward with a step difference from the fishway 19 to form a tubular fishway 19 having a substantially constant cross-sectional area, so that the amount of water flowing through the fishway 19 during a flood or the like can be increased. You may limit it.

In this way, the water level is sufficiently maintained upstream of the weir body 11 as long as there is no abnormal water shortage, etc., and the water flowing in from the dowel port 15 sequentially flows into each tank 18 and reaches the downstream side of the weir body 11 via the drainage port 16. The fish released from the weir body 11 to the upstream are fish paths.
Fish that climb upstream 19 and descend from the upstream of the weir body 11 can also pass through the fishway 19 according to the flow of running water and descend downstream.

(Effects of the Invention) Since the present invention is configured as described above, the fishway provided in the weir can direct the upstream fish to the upstream, and the fishway provided in the weir provides There is no need to expand the width of the river near the weir installation point, and the overall civil engineering shape can be constructed to reduce construction costs.

[Brief description of drawings]

FIG. 1 is a front view of a movable weir provided with a fishway according to an embodiment of the present invention, FIG. 2 is a side sectional view of a main part of FIG. 1, and FIG. 3 is a front view of a conventional movable weir. 9 ... Movable weir, 11 ... Weir body 15 ... Drinking mouth, 16 ... Discharge port 18 ... Tank, 19 ... Fishway

Claims (1)

[Scope of utility model registration request] 1. A movable weir built across a river and provided with a vertically movable weir body, wherein a fish path is provided inside the weir body, in which a plurality of tanks are arranged stepwise in the river transverse direction. A fishway device for a movable weir, characterized in that a dovetail leading to the upper part of the fishway is provided upstream of the weir body, and a discharge port leading to the lower part of the fishway is provided downstream of the lower part.