JPS602269Y2 - fishway - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a fish ladder.

If there is a head in the river, the fish ladder should be 2 to 6 m wide and slope device/1.
A stepped waterway with a size of 0 to l/15 is provided to allow fish to pass through.

The overflow depth of the stepped waterway is generally 0.15 m, ~0.
It is said that the optimum height is 25m, but the difference between steps is about 0.3m.

Now, because conventional fishways are generally made of fixed staircases made of concrete, they have the following problems.

(b) Reduce river cross-sectional area and reduce river water flow capacity during floods, etc.

(b) Water flows through the fishway only when there is sufficient river water, and it does not function as a fishway during the dry season.

Also, it is difficult to secure the optimum overflow water depth.

The present invention solves the above problems.

An explanation will be given below with reference to the illustrative drawings. As shown in Fig. 1, the present invention consists of flexible membrane undulating weirs 1.1', 1'' 1 n that are spaced apart in the flow direction of the river and stepped in the direction across the river.
t, etc., and when the upstream water storage source drops and no overflow occurs during a drought, the upstream weir is gradually collapsed as shown in Figure 2, and when the water rises, the collapsed weir is inflated sequentially from the downstream weir.

This mechanism allows water to flow through the Mokugyo Pass at all times, except during abnormally dry periods (when there is almost no upstream water storage source).

In Figures 1 and 2, 2 is the fish ladder and 3, 3', 3'.

3'', etc. are water injection and drainage (air) pipes, and the flexible membrane undulating weir 1.1', 1'', 1'', etc. are flexible membrane weirs forming the weir body, as is already known. The envelope (bag-like body) is attached to at least the riverbed in the direction across the river, and a fluid such as water or air or both is sent from the inlet/drainage (air) pipe communicating inside the envelope to cause it to expand or to stand up. (See, for example, Japanese Patent Publication No. 1170-1170 and Japanese Patent Publication No. 23'11 of 1973).

Figure 3 is a front view of the river seen from the downstream side to the upstream side in Figure 1, with 2 the fishway, 4 the river bed, 5 the weir, 64 the bank slope, and 7 the fishway partition wall. be.

The concrete implementation of the above is as follows: (1) Separate piping systems (including pumps, pressure regulators and depressurizers inside the dam for water supply and drainage (air) sources, etc.) are provided for each type.

In addition, a packet mechanism, a siphon mechanism (in the case of a water expansion type), or a blow-off mechanism (in the case of an air expansion type) (see Fig. 4), which are conventionally used for tilting the weir, are separately provided.

■ Install a water level detector upstream of the highest temperature to detect the water source.

■ Install internal pressure detectors in each type.

(2) A control device will be provided which is connected to the internal pressure regulators, water level detectors, and internal pressure detectors of (2) to (3) by electrical signals.

The above combination diagram is illustrated in FIG. 4 for the i-th weir from the upstream (for the S-water expansion weir).

In Figure 4, 1" is the i-th weir, 2 is the fishway, 3" is the water supply pipe, 4 is the river bed, 8 is the water supply and drainage pump, 9 is the siphon pipe, 10 is the valve, 11 is the water level detector, 12 13 is an internal pressure detector, 13 is a control device, 14 is wiring for distributing electrical signals,
Reference numerals 15 and 15 respectively indicate the set water level for the i-th weir expansion and inversion (i.e., the i-th weir height).

In the above case, the weir is toppled as follows.

A water level detector 11 monitors the upstream water level, and if the water level falls below a set water level (that is, weir height), the drainage pump is activated to completely drain the water in the weir.

When the internal pressure detector 12 reaches the set pressure (approximately Okg/d), the drainage pump is stopped.

The expansion of the weir is carried out as follows.

When the water level rises, the water level detector 11 detects that it has exceeded the set water level (that is, the height of the weir), and the water supply pump is activated to expand the weir.

When the internal pressure detector 12 reaches a predetermined pressure, the water supply pump is stopped.

The present invention as described above has the following advantages.

■ By completely collapsing the undulating weir during floods, the river's water flow capacity will not be reduced.

■ It is very effective as a fish ladder because it can ensure a constant overflow depth even during times of drought or flooding.

In addition, in the present invention, although it has been explained that the complete collapse is performed by expanding and collapsing each layer depending on the increase or decrease in the upstream water level, it is not necessarily a complete collapse, but may be partial.

[Brief explanation of drawings]

Figure 1 is a diagram of the fishway according to the present invention taken in the flow direction during normal water flow, Figure 2 is a diagram taken in the flow direction of the fishway of the present invention during dry water, and Figure 3 is a diagram of the fishway in Figure 1 taken along the flow direction. FIG. 4 is a front view viewed from the downstream side to the upstream side, and is an explanatory view of means for expanding and collapsing the fishway weir of the present invention layer by layer by increasing and decreasing the upstream water level. 1.1', 1'', 1'''...flexible membrane undulating weir, 2.
...Fishway, 3.3', 3'', 3''...Injection and drainage (air) pipe, 4...River bed, 5...Weir, 6...River slope, 7.
...Fishway partition wall, 8... Water supply and drainage pump, 9... Siphon pipe, 10... Valve, 11... Water level detector, 12... Internal pressure detector, 13... Control device, 14・
... Wiring, 15... Set water level for i-th weir expansion and lodging (
In other words, it is the same as the weir height).

Claims (1)

[Scope of utility model registration request] A plurality of flexible membrane undulating weirs are provided at intervals in the river flow direction and in a direction across the river to allow water to flow in a stepped manner,
These weirs are designed to allow fish to pass through, and each of these weirs consists of a separate piping system, and is equipped with a control device that connects an upstream water level detector and an internal pressure regulator for each layer using electrical signals. A fish ladder is used to ensure overflow water is always ensured by lowering the weir when the upstream water level becomes equal to the weir height.