JP5526404B2 - Siphon pipe fishway - Google Patents

Description

The present invention relates to a siphon type pipe fishway provided in a river weir or the like.

Many fish that live in rivers move up and down the river as they grow and shift their living areas. And, if there is a weir in the middle of the river, these fish may not be able to move upstream due to the height difference provided by the weir, and may be affected by breeding, etc. May artificially provide a fishway so that fish can travel backwards.
Artificial fishways, for example, are divided by a partition plate with an opening, and a pool type with a slow flow pool connected in a staircase pattern, or a number of protrusions etc. on the bottom of an inclined water channel. There is a stream type in which a fast region and a slow region are distributed in a mosaic pattern to provide a path through which fish can go up.

However, for the pool type and the stream type, it is necessary to consider the fluctuation of the river water level when determining the position of the upstream outlet (inlet) and downstream inlet (outlet) of the fishway. Since the water level does not flow to the fishway and the fishway does not function due to a drop in the water level, careful consideration is required to determine the shape and location of the upstream outlet.
Even if the shape and installation position of the upstream outlet is appropriate, it is not possible to avoid changes in the speed of water flowing through the fishway due to fluctuations in the river level. It is difficult to design a fishway to ensure a stable route possible.
Therefore, a fishway using the principle of siphon is proposed in which the upstream outlet and the downstream inlet are immersed in the water on the upstream and downstream sides of the weir, respectively, and the flow rate is not affected by the flow rate fluctuation of the river ( For example, see Patent Document 1).

Utility Model Registration No. 3131554

However, the fishway of Patent Document 1 includes a fish resting chamber formed by alternately connecting a plurality of partition plates and partition pipes with ropes in a pipe (conduit) that serves as a fish upstream path. Since the board is closely arranged with the inner periphery of the pipe, the partition board is likely to be clogged with dust such as leaves. In addition, if you try to remove the separator from the pipe by pulling the rope to remove the clog, it will cause friction between the separator and the inner periphery of the pipe, and the separator cannot be removed. Or the separator may be damaged, which is problematic in terms of maintainability.
This invention is made | formed in view of this situation, and it aims at providing the siphon type pipe fishway which is excellent in maintainability while preventing it being influenced by the flow rate by the water level fluctuation | variation of a river.

The siphon type pipe fishway according to the present invention that meets the above-mentioned object is a bendable pipe comprising a water inlet that is immersed in water upstream of a step provided in a river and a water outlet that is immersed in water downstream of the step. A flow rate adjusting means provided at an end or an intermediate position of the pipe and having an opening having a diameter of 1/5 to 4/5 of the inner diameter of the pipe, and forming the fish path; And a support member fixed to the upstream side of the step or the step of the river.

In the siphon type pipe fishway according to the present invention, it is preferable that the opening of the flow rate adjusting means is formed at a reduced diameter end of a truncated cone-shaped tapered portion having an enlarged diameter end fixed inside the straight portion.

The siphon type pipe fishway which concerns on this invention WHEREIN: It is preferable that the diameter reduction end of the said taper part has faced the upstream.

In the siphon type pipe fishway according to the present invention, at least one end portion of the straight portion is formed with a male screw or a female screw, and can be screwed to a straight pipe provided at an end portion of the divided pipe. Is preferred.

In the siphon type pipe fishway according to the present invention, it is preferable that an inner diameter of the pipe is in a range of 90 to 300 mm, and an overall length of the tapered portion including the opening is in a range of 50 to 300 mm.

In the siphon-type pipe fishway according to the present invention, it is preferable that the water inlet is provided with a dust repellent through which fish can pass.

In the siphon type pipe fishway according to the present invention, it is preferable that a part or all of the pipe comprises a bellows hose.

In the siphon type pipe fishway according to the present invention, one or a plurality of the flow rate adjusting means is provided in the middle of the pipe, and the flow rate of the passing water is adjusted in the range of 1 to 2 m / second by the pipe. preferable.

Siphon pipe fishway of claim 1-7, wherein it includes a water inlet is immersed in water at the upstream side of the step provided in the river, since it has a pipe provided with a water outlet which is immersed in water at the downstream side of the step, siphon Using this principle, the water flowing in from the water inlet can be sent out from the water outlet, and even if the river water level fluctuates, it is possible to secure a fishway with a stable flow rate (flow velocity) in the pipe.
In addition, since the pipe can be bent, the pipe can be bent in accordance with the shape of the level difference of the river, so that it can correspond to various types of level difference (for example, weir).
Furthermore, since the diameter of the opening of the flow rate adjusting means is 1/5 to 4/5 of the inner diameter of the pipe, the flow rate of water can be limited by adjusting the flow rate of water at the opening.

In addition, since the opening of the flow velocity adjusting means is formed at the reduced diameter end of the truncated cone-shaped tapered portion with the enlarged diameter end fixed inside the straight portion, all the water flowing in from the water inlet is water It will pass through the opening part which restrict | limits the passage amount, and will go to a water outlet, and can decelerate water reliably by the flow-rate adjustment means.

In the siphon type pipe fishway according to claim 2, since the diameter-reduced end of the tapered portion faces the upstream side, the fish going up is surely guided to the opening along the inclination of the diameter of the tapered portion. It is possible.

Since the siphon type pipe fishway of Claim 3 has a male thread or a female thread formed in at least one end part of the straight part, it can be screw-coupled with the straight pipe provided at the end part of the divided pipe. If the opening is clogged after installing the siphon-type pipe fishway, the screw connection between the straight pipe and the straight part is released, and the clogging can be removed easily and quickly. Costs can be suppressed.

In the siphon type pipe fishway according to claim 4 , since the inner diameter of the pipe is in the range of 90 to 300 mm, the pipe can be easily handled when the pipe is moved or installed.

Since the siphon type pipe fishway according to claim 5 is provided with the dust removal at the water inlet, it is possible to prevent the ingress of the dust from the water inlet and to suppress the clogging of the dust into the opening or the like.

In the siphon type pipe fishway according to the sixth aspect , part or all of the pipe is formed of a bellows hose. Therefore, it is possible to finely adjust the bending angle and install the pipe along the shape of the step.

In the siphon type pipe fishway according to claim 7 , one or a plurality of flow rate adjusting means are provided in the middle of the pipe, and the flow rate of the passing water is adjusted to a range of 1 to 2 m / sec. In addition, it is possible to ensure a flow velocity of 1 to 2 m / sec suitable for fish going up in the pipe.

It is explanatory drawing of the siphon type pipe fishway which concerns on the 1st Embodiment of this invention. It is sectional drawing of the flow-speed adjustment means of the siphon type pipe fishway. It is explanatory drawing of the siphon type pipe fishway which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the flow-speed adjustment means of the siphon type pipe fishway.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 and 2, the siphon pipe fishway 10 according to the first embodiment of the present invention is a water inlet 11 that is immersed in water upstream of a weir (an example of a step) provided in a river. And a bendable pipe 13 having a water outlet 12 immersed in water downstream of the weir, and a diameter that forms a fish path that is provided at an intermediate position of the pipe 13 and goes up the fish, is 1 / of the inner diameter of the pipe 13. Flow rate adjusting means 15, 16, 17, 18 having an opening 14 of 5 to 4/5, and a support member 19 for fixing the pipe 13 to the weir. Hereinafter, these will be described in detail.

The pipe 13 includes first, second, and third pipes 21, 22, and 23 arranged in order from the upstream side to the downstream side. The first, second, and third pipes 21, 22, and 23 are each made of a plastic flexible bellows hose and have an inner diameter L in the range of 90 to 300 mm, for example, 200 mm.
The base (upstream end) of the first pipe 21 is immersed in the water upstream of the weir, the water inlet 11 through which water flows is provided, and the tip (downstream end) of the third pipe 23 is provided. Is provided with a water outlet 12 that is immersed in the water downstream of the weir and that flows out of the water inlet 11 into the downstream of the weir.

The water inlet 11 is disposed at a position (for example, 1.5 m) higher than the water outlet 12, and the water flowing in from the water inlet 11 is the first, second, and third pipes 21, 22 according to the siphon principle. , 23 and water is discharged from the water outlet 12.
A part of the pipe 13 is arranged at the top of the weir and is located higher than the water inlet 11, but the water flowing in from the water inlet 11 due to the siphon principle flows through the pipe 13 toward the water outlet 12 without a gap. Therefore, a flow path that extends beyond the top of the weir can be formed, and even if the weir has no overflow, a fish upstream path can be secured without processing the weir.

The first pipe 21 is fixed to the weir by a support member 19 made of a wire or the like attached to the weir, and the water inlet 11 is fixed at a predetermined position. The water inlet 11 is provided with a coarse mesh-like dust remover 24 through which fish can pass.
In the present embodiment, the water inlet 11 and the water outlet 12 are arranged at normal river water levels (not during water increase or drought) at positions of a water depth of 600 mm and a water depth of 500 mm, respectively. The depth from the water surface of the water outlet 12 varies depending on the water depth of the river where the siphon pipe fishway 10 is installed, the difference in fluctuation of the water level, and the like. In addition, it is possible to determine whether or not the garbage guard 24 is provided at the water inlet 11 according to the type and amount of garbage flowing through the river.

The flow rate adjusting means 15, 16, 17, and 18 are made of plastic, each having a straight tubular straight portion 25, an enlarged diameter end fixed to the inside of the straight portion 25, and a tubular opening 14 formed at the reduced diameter end. And a truncated cone-shaped tapered portion 26.
In addition, since the diameter-reduced end of the taper portion 26 is arranged facing the upstream side, the fish heading from the downstream side of the weir to the upstream side is moved to the opening portion 14 along the inclination of the taper portion 26 to reduce the diameter. Can be guided.

The base portion (upstream end portion) of the upstream straight pipe 28 is attached to the tip portion (downstream end portion) of the first pipe 21 by the fixing band 27, and the tip portion (downstream side) of the upstream straight pipe 28 is attached. The end portion is fitted to the base side of the straight portion 25 of the flow rate adjusting means 15 and connects the first pipe 21 and the flow rate adjusting means 15 in series.
Further, an intermediate straight pipe 29 is provided between the flow velocity adjusting means 15 and 16 so that both ends are fitted into the straight portions 25 of the flow velocity adjusting means 15 and 16 and the flow velocity adjusting means 15 and 16 are connected in series. Yes.
Then, a downstream straight pipe 30 is provided in which a base portion is fitted on the front side of the straight portion 25 of the flow rate adjusting means 16 and the front portion is fixed to the second pipe 22 by a fixing band 27.

The upstream straight pipe 28, the intermediate straight pipe 29, and the downstream straight pipe 30 are made of plastic and have an inner diameter in the range of 85 to 295 mm, for example, 190 mm. The straight part 25 of the flow rate adjusting means 15, 16 is formed with an inner diameter in the range of 90 to 300 mm (for example, 200 mm), and the opening 14 of the flow rate adjusting means 15, 16 has a diameter B of the pipe 13 (first, The inner diameter L of the second and third pipes 21, 22, 23) is 1/5 to 4/5. The total length A of the tapered portion 26 including the opening 14 (the combined length of the opening 14 and the tapered portion 26) is in the range of 50 to 300 mm, for example, 100 mm.

Between the second and third pipes 22 and 23, an upstream straight pipe 33, a flow velocity adjusting means 17, an intermediate straight pipe 34, a flow velocity adjusting means 18, and a downstream straight pipe 35 are connected in series from the upstream side. The upstream straight pipe 33 and the downstream straight pipe 35 are fixed to the second and third pipes 22 and 23 by a fixing band 27, respectively.
The upstream straight pipe 33, the intermediate straight pipe 34, and the downstream straight pipe 35 are formed in the same shape, size, and material as the upstream straight pipe 28, the intermediate straight pipe 29, and the downstream straight pipe 30, respectively. ing.

Here, between the first and second pipes 21 and 22 and between the second and third pipes 22 and 23, the same number (two in the present embodiment) of flow rate adjusting means is provided. However, the number is not necessarily the same. For example, when three or more flow rate adjusting means are provided between the first and second pipes 21 and 22, the intermediate straight pipe is increased and each flow rate adjusting means is provided. Can be connected in series and when one flow rate adjusting means is provided, an intermediate straight pipe is not required.
The number of flow rate adjusting means provided in the pipe is, for example, siphon so that the flow rate of water passing through the pipe is in a range of 1 to 2 m / second (for example, 1.5 m / second) that is generally suitable for fish going up. It is tentatively decided at the time of preparing the installation plan of the type pipe fishway, and finally decided by actually measuring the flow velocity at the setting site.

The siphon type pipe fishway 10 includes plastic first, second and third pipes 21, 22 and 23, flow rate adjusting means 15, 16, 17 and 18, upstream straight pipes 28 and 33, and intermediate straight pipe 29. , 34 and downstream straight pipes 30 and 35 are used, and are lighter than those formed of stainless steel or the like. Therefore, the siphon type pipe fishway 10 is easy without requiring heavy equipment such as a crane car. And can be installed in a short time.

When the siphon type pipe fishway 10 is installed in a river weir, first, the water outlet 12 is sealed with a vinyl sheet or the like, and the first, second, and third pipes 21, 22, and 23 are bent, and other members. The state in which the principle of siphon can be used, that is, the state where water is fully filled from the water outlet 12 to the water inlet 11 by flowing water from the water inlet 11 which is the highest position compared to the parts. create. The water inlet 11 and the water outlet 12 are immersed in water so that the water inlet 11 is higher than the water outlet 12 in a state where the water is fully filled from the water outlet 12 to the water inlet 11. By removing the vinyl sheet and winding the support member 19 around the first pipe 21 and fixing the support member 19 to the weir, a flow path (fish path) over the top of the weir is provided.

After the flow path using the siphon principle is provided, a stable flow rate is maintained in the pipe 13 as long as the water inlet 11 or the water outlet 12 does not come out of the water surface even if the water level of the river fluctuates. It is possible to secure a route through which fish can run up during both high and low water.
Further, when dust such as leaves is clogged in the opening 14 of the flow rate adjusting means 15 and 16 (the same applies to the flow rate adjusting means 17 and 18), the upstream straight pipe 28, the intermediate straight pipe 29, and the downstream straight Since part of the connection with the pipe 30 can be removed to remove the clogging, the clogging removal work after installation can be performed in a short time. Furthermore, it is not necessary to provide a mechanism used only for taking out the dust, such as an open / close door, in the flow rate adjusting means, and the number of members and parts constituting the flow rate adjusting means can be suppressed.

Next, a siphon type pipe fishway 40 according to a second embodiment of the present invention will be described.
In addition, about the component same as the siphon type pipe fishway 10, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIGS. 3 and 4, the siphon-type pipe fishway 40 is formed with a straight portion 41 having internal threads formed at both ends and a tubular opening 42 that restricts the flow of water. Plastic flow rate adjusting means 44, 45, 46, and 47 each having a fixed tapered portion 43 are provided.
The taper portion 43 of the flow rate adjusting means 44, 45, 46, 47 has a truncated cone shape, the diameter-expanded end is fixed inside the straight portion 41, and the opening 42 is formed at the diameter-reduced end of the taper portion 43. Yes.

Further, one end (upstream end) of the first pipe 21 is fixed to the first pipe 21 by a fixing band 27, and an upstream straight is formed with a male screw at the other end (downstream end). A pipe (an example of a straight pipe) 48 is provided, and the flow velocity adjusting means 44 (straight portion 41) is screwed to the upstream straight pipe 48 and connected in series to the first pipe 21.
Between the flow rate adjusting means 44 and 45, male screws are formed at both ends, and an intermediate straight pipe 49 screwed to the flow rate adjusting means 44 and 45 is disposed.
Further, one end (downstream end) of the second pipe 22 is fixed to the second pipe 22 by a fixing band 27, and a male straight thread is formed at the other end (upstream end). A pipe (an example of a straight pipe) 50 is provided, and the flow rate adjusting means 45 is screwed to the downstream straight pipe 50 and connected in series to the second pipe 22.
In addition, each part to which the flow rate adjusting means 44 and 45 are screw-coupled is prevented from leaking by a sealing material.

The upstream straight pipe 48, the intermediate straight pipe 49, and the downstream straight pipe 50 are made of plastic and have an inner diameter in the range of 85 to 295 mm, for example, 190 mm. The straight portion 41 of the flow velocity adjusting means 44, 45 is formed with an inner diameter in the range of 90 to 300 mm (for example, 200 mm), and the opening 42 of the flow velocity adjusting means 44, 45 has a diameter B ′ of the pipe 13 (first The inner diameter L of the second and third pipes 21, 22, 23) is 1/5 to 4/5 times. The total length A ′ of the tapered portion 43 including the opening 42 (the combined length of the opening 42 and the tapered portion 43) is in the range of 50 to 300 mm, for example, 100 mm.

Between the second and third pipes 22 and 23, the upstream straight pipe 51, the flow rate adjusting means 46, the intermediate straight pipe 52, the flow rate adjusting means 47, and the downstream straight pipe 53 are screwed in order from the upstream side. The upstream straight pipe 51 and the downstream straight pipe 53 are fixed to the second and third pipes 22 and 23 by a fixing band 27, respectively.
The upstream straight pipe 51, the intermediate straight pipe 52, and the downstream straight pipe 53 are formed in the same shape, size, and material as the upstream straight pipe 48, the intermediate straight pipe 49, and the downstream straight pipe 50, respectively. ing.

The flow velocity adjusting means 44, 45, 46, 47 are arranged so that the diameter-reduced end of the tapered portion 43 faces the upstream side, so that the fish moving from the downstream side of the weir to the upstream side is reduced in diameter by the tapered portion 43. It can guide to the opening part 42 along the inclination to do.
Further, in the present embodiment, the flow rate adjusting means 44, 45, 46, 47 are formed with female threads at both ends of the straight portion 41, but a flow rate adjusting means with male threads formed can also be used. In this case, the upstream straight pipe, the intermediate straight pipe, and the downstream straight pipe are formed with internal threads that are engaged with the external threads of the flow rate adjusting means.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, the installation of the siphon type pipe fishway is not limited to steps such as weirs, but can be installed on steps naturally formed in rivers.
The number of flow rate adjusting means is not limited to four, and the number is changed depending on the height and shape of the step where the siphon type pipe fishway is installed. The flow rate adjusting means can be provided not at the intermediate position of the pipe but at the end of the pipe, and the pipe may be fixed upstream of the step by a support member. Further, the pipe may be entirely a bellows hose or a part of the pipe may be a bellows hose.
The openings of the flow rate adjusting means do not need to be all the same size, and can be made different sizes depending on the flow rate adjusting means. The smaller the diameter, the greater the water deceleration effect.

10: siphon type pipe fishway, 11: water inlet, 12: water outlet, 13: pipe, 14: opening, 15, 16, 17, 18: flow rate adjusting means, 19: support member, 21, 22, 23: first 1, 2nd, 3rd pipe, 24: Waste removal, 25: Straight part, 26: Tapered part, 27: Fixed band, 28: Upstream straight pipe, 29: Intermediate straight pipe, 30: Downstream straight pipe, 33: Upstream straight pipe, 34: Intermediate straight pipe, 35: Downstream straight pipe, 40: Siphon type pipe fishway, 41: Straight part, 42: Opening part, 43: Tapered part, 44, 45, 46, 47: Flow rate adjusting means, 48: upstream straight pipe, 49: intermediate straight pipe, 50: downstream straight pipe, 51: upstream straight pipe , 52: intermediate straight pipe, 53: downstream straight pipe

Claims (7)

A bendable pipe comprising a water inlet that is immersed in water upstream of a step provided in a river, and a water outlet that is immersed in water downstream of the step;
A flow rate adjusting means provided at an end or an intermediate position of the pipe and having an opening having a diameter of 1/5 to 4/5 of the inner diameter of the pipe;
Have a support member for fixing the step of upstream or the rivers of the step of at least the river said pipe,
The siphon-type pipe fishway, wherein the opening of the flow velocity adjusting means is formed at a reduced diameter end of a truncated cone-shaped tapered portion having an enlarged diameter end fixed inside the straight portion . The siphon type pipe fishway of Claim 1 WHEREIN: The diameter-reduction end of the said taper part has faced the upstream side, The siphon type pipe fishway characterized by the above-mentioned. The siphon type pipe fishway according to claim 1 or 2 , wherein at least one end portion of the straight portion is formed with a male screw or a female screw, and can be screwed to a straight pipe provided at an end portion of the divided pipe. Siphon type pipe fishway characterized by becoming. It in siphon pipe fishway according to any one of claims 1 to 3, the inner diameter of the pipe is in the range of 90～300Mm, the total length of the tapered portion including the opening in the range of 50~300mm Siphon type pipe fishway characterized by. The siphon type pipe fishway of any one of Claims 1-4 WHEREIN: The garbage entrance which a fish can pass is provided in the said water inlet, The siphon type pipe fishway characterized by the above-mentioned. The siphon type pipe fishway of any one of Claims 1-5 WHEREIN: Part or all of the said pipe consists of a bellows hose, The siphon type pipe fishway characterized by the above-mentioned. The siphon type pipe fishway of any one of Claims 1-6 WHEREIN: The said flow velocity adjustment means is provided in the middle of the said pipe, or one or more, The flow velocity of the water to pass is the range of 1-2 m / sec in the said pipe. Siphon type pipe fishway characterized by being adjusted to.

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