JP3196108B2 - Bulging fishway - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swollen fishway made of an elastic material and formed by injecting a compressed fluid into the inside and expanding it.

[0002]

2. Description of the Related Art Fishways, dams and the like installed in rivers are collectively referred to as river structures. These structures are conventionally formed of concrete. In recent years, it has been studied to form these river structures in a hollow body from an elastic material, and to inflate the hollow portion by injecting a compressed fluid. In Japanese Patent Application No. 8-323832, the applicant also installs a main body 1 made of a hollow body at the river bottom and connects the upstream inflow port 2 and the downstream river bottom section 3 at the time of bulging by injecting compressed fluid into the hollow part. An application is made for a fishway 5 which forms a run-up portion 4 of a fish.

[0003]

However, since the internal pressure is evenly applied to the hollow portion of the above-mentioned river structure, the cross section expands in a circular shape, so that the shape when expanded is different from the desired cross section initially set. There is a problem that is different. That is, FIG. 4
In the fishway shown in (1), there is a problem that the displacement amount at the middle point M increases, the inclination of the upstream portion 4 below the point M increases, and the fish run-up rate decreases.

[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a swollen fishway which can exhibit the original performance of a structure and can be adapted to the surrounding scenery.

[0005]

According to a first aspect of the present invention, a compressed fluid is formed in a hollow body from an elastic material, is provided at a step portion of a river, and a bottom portion is fixed to a river bottom portion of the river. And a body that is swelled
It is characterized in that a shape regulating portion is provided which regulates the upstream portion of the fish connecting the upstream inlet and the downstream river bottom in a substantially linear manner when the main body swells .

According to a second aspect of the present invention, the shape regulating portion is a rigid body.
And is connected to the river bottom through a connecting member.
Having the features at that.

According to a third aspect of the present invention, the shape regulating portion is a rigid body.
It is characterized in that it is connected to another shape regulating portion by a helical connecting member .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A swollen fishway 10 of the present invention will be described below with reference to FIGS. First, in FIGS. 1 and 2, a step portion 13 is provided between an upstream side 11 of a river and a river bottom portion 12 downstream thereof. A flow guide wall 14 is provided at the upper end of the step portion 13, and an inlet 15 is formed in a part of the flow guide wall 14. A recess 16 is provided in the downstream river bottom 12 in contact with the step 13.

The fishway 10 is provided on the downstream side in contact with the step 13. The main body 21 is formed in a hollow body having a hollow portion 22 from an elastic material, for example, a sheet made of a synthetic rubber or a synthetic resin.
, And the lower surface is fixed to the concave portion 16 of the river bottom 12. In addition, the main body 21 is colored in a color close to natural stone, for example, a rattan color.

The air pump 23 injects or discharges compressed air into the hollow portion 22. When the compressed air is injected into the hollow portion 22, the main body 21 swells and its upper surface is connected to the inflow port 15. It becomes the upstream part 24 connecting the river bottom part 12. still,
The compressed fluid is not limited to high-pressure air, and may be a liquid such as nonflammable gas (carbon dioxide) or water.

The upstream portion 24 is provided with a plurality of water receiving portions 25 which are formed of an elastic material such as a synthetic rubber or synthetic resin sheet so as to be able to expand and contract. This water receiving section 25
Has a container shape with an open upper end, and temporarily stores water flowing from the upstream. Excess water overflows and flows downstream to form a flow path for fish to run up. In addition, the water receiving section 25
A drain port (not shown) is formed at the lower end of the.

The shape regulating portion 31 is formed of a linear rigid body, for example, a mold steel, and is integrally embedded in the main body 21. The shape regulating portion 31 is configured to be
4 is regulated almost linearly, as shown in FIG.
A plurality of rows are intermittently arranged on the inner surface along the upstream portion 24 at intervals. This shape regulating portion 31 has 1
One or two ends of a bendable connecting member, for example, a chain 32 are connected. The other end of the chain 32 is connected to the recess 16. The length of each of the chains 32 is selected so that the plurality of shape regulating portions 31 are arranged substantially linearly. The connecting member is not limited to a chain, but may be a rope such as a rope.

Next, the operation of the above configuration will be described.
When a compressed fluid is injected into the hollow portion 22 of the main body 21 from the air pump 23, the main body 21 swells and the shape regulating portion 31
Also moves while the connecting member 32 is extended. When the connecting member 32 is fully extended, the movement of the shape regulating portion 31 also stops. Then, the plurality of shape regulating portions 3
1 are substantially aligned, and the upstream portion 24 is formed into a predetermined shape. According to the fishway 10, since the inclination angle of the upstream portion 24 does not change abruptly as in the prior art, the fish can be easily moved up.

When the air pump 23 discharges the compressed fluid in the hollow portion 22, the main body 21 contracts rapidly, and as shown in FIG. 10.

[0015]

According to the present invention, a hollow body is formed from an elastic material, is provided at a step portion of a river, a bottom portion is fixed to a river bottom of the river, and a compressed fluid is injected into the hollow portion to swell. The main body, and the upstream part of the fish which is arranged on the inner surface of the main body and connects the upstream inlet and the downstream river bottom when the main body swells.
Since the shape regulating portion for regulating the shape in a substantially straight line is provided, the upstream portion can be formed to have a substantially uniform inclination from the downstream to the upstream, so that the fish can easily go up.

[0016]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a swollen fishway .

FIG. 2 is a plan view of a fishway.

FIG. 3 is a longitudinal sectional front view in a state where the swollen fishway is contracted.

FIG. 4 is a longitudinal sectional side view of a conventional fishway.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fishway 11 Upstream side 12 River bottom part 13 Step part 16 Concave part 21 Main body 22 Hollow part 23 Air pump 24 Backward part 31 Shape regulation part 32 Chain (connection member)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02B 7/20 103

Claims (3)

(57) [Claims] 1. A main body formed in a hollow body from an elastic material and provided at a step portion of a river, a bottom portion of which is fixed to a river bottom of the river, and which is expanded by injecting a compressed fluid into the hollow portion. The fish run-up section, which is arranged on the inner surface of the main body and connects the upstream inlet and the downstream river bottom when the main body swells, has a substantially linear shape.
A bulging fishway characterized by having a shape regulating portion for regulating the size of the fishway. 2. The swollen fishway according to claim 1, wherein the shape restricting portion is made of a rigid body and is connected to a river bottom of the river via a connecting member. 3. The swollen fishway according to claim 1, wherein the shape restricting portion is made of a rigid body and is connected to another shape restricting portion by a connecting member.