JPH0634450U - River fish reef unit and top plate - Google Patents

Abstract

(57) [Summary] [Purpose] There is little sedimentation, and it is in harmony with the riverside nature.
(EN) Provided are a fish reef unit for rivers and a top plate that form an environment in which river fish prefer to collect and proliferate. [Structure] The side wall facing the main stream of the river is provided with a plurality of water flow holes with an angle of inclination of 15 to 85 °, and at least one is provided in the rectangular box.
A rectangular box-shaped fish reef unit with a pair of straightening vanes arranged in a zigzag pattern on the side wall with multiple water holes. The same unit has a straightening plate with a taper. And a top plate that has a water hole at the bottom and a recess suitable for landing on riverside plants, and is removable from these.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a river fish reef unit, and more particularly to a river fish reef unit and a top plate that are particularly suitable for growing river fish such as ayu, ayu, carp, abalone, eel, river shrimp, and river crab.

[0002]

[Prior art and problems]

 Due to pollution of river water quality and construction of dams, it has become extremely difficult for the above-mentioned river fish such as ayu to proliferate. Especially in the case of sweetfish that feeds on algae during the adult season, the reduction of the boulder effect due to the construction of the upstream dam is fatal. .

In addition, as a result of revetment work, inorganic riverbanks that often consist of concrete retaining walls often appear, and so-called ant crawling gaps do not exist, and modern rivers are not only sweetfish but all rivers. The environment has become difficult for fish to live in.

Therefore, efforts are being made to restore the natural environment to the riverbank by residents along the river, central government agencies such as the Ministry of Construction, and local governments.

These include, for example, “multi-natural river development” advocated by the Ministry of Construction.

As one of them, there are measures for developing and disseminating a river fish reef unit.

Various types of fish reef units themselves have already been devised, developed and put into practical use, mainly for the purpose of marine aquaculture such as so-called marine farms.

However, the river fish reef unit has hardly been developed, probably because of limited use and scale, or because it is exposed to a violent water flow, and the actual situation is that there are very few practical examples. .

Therefore, the present inventors, in response to the call from the local government, made a trial construction of a river fish reef unit called “woodwork sedimentation”.

A woodworking floor is a structure in which pine wood (or cedar wood) is assembled in the shape of a double girder and piled up with a fixed size of natural stone or crushed stone. So-called historic disaster-prevention civil engineering has been performed since ancient times. It is a technology.

However, since the wooden girders have poor durability, it is difficult to supply the stones, and it is also difficult to maintain the transmission technique, there arises a problem that it is extremely difficult to implement the woodworking floor.

[0012] The "bank reef block with fish reef" shown in Japanese Utility Model Publication No. 61-135928 is also applicable to rivers and is said to have the effect of preventing the inflow of sediment, but the relationship between the configuration of the device and the effect I'm not sure. In addition, no measures have been taken for harmony with the nature of the riverside.

Therefore, the present inventors have arrived at the present invention as a result of earnest studies from the technical viewpoint of not only preventing the inflow of earth and sand but also actively injecting the earth and sand even if it inflows.

[0014]

[The purpose of the device]

 An object of the present invention is to provide a river fish reef unit with less sedimentation.

Another object of the present invention is to provide a river fish reef unit and a top plate that are in harmony with the nature of the riverside and provide an environment in which river fish prefer to collect and proliferate.

[0016]

[Constitution of device]

 According to the present invention, in a rectangular box-shaped river fish reef unit having a plurality of water flow holes on the side wall, a pair of short side walls are arranged substantially at right angles to the river water flow, and a pair of long side walls are arranged. The water flow holes are arranged almost parallel to the river water flow, and the water flow holes are provided on the side wall facing the direction of the water flow at an angle of 15 to 85 °, and at least one pair of straightening vanes are provided in a staggered manner in the rectangular box. A fish reef unit for rivers (claim 1), characterized in that it is a straightening plate having a taper in the vertical direction such that at least one pair of staggered straightening plates approach each other in the downward direction. The river fish reef unit according to claim 1 (claim 2), which is a rectangular box fish reef unit having a plurality of water flow holes on the side wall, wherein a pair of short side walls are arranged substantially at right angles to the river water flow. Installed, and the pair of long side walls are almost parallel to the river water flow The auxiliary fish reef unit, which is arranged and has a water flow hole on each side wall, and at least one pair of straightening vanes is staggered in a rectangular box, is connected in parallel to the river bank side. The fish reef unit for rivers according to claim 1 (claim 3) and a recess having a water passage hole at the bottom and suitable for landing of riparian plants on the top surface, according to any one of claims 1 to 3. Provided is a top plate which is detachably attached to the river fish reef unit described above (Claim 4).

The present invention will be described in detail below with reference to examples.

[0018]

【Example】

 1 is a plan sectional view of an embodiment of the present invention, FIG. 2 is a side view of the embodiment (a view taken along the line BB of FIG. 1), and FIG. 3 is a sectional view taken along the line AA of FIG.

1, FIG. 2 and FIG. 3, 1 is a river fish reef unit, 2 and 8 are upstream and downstream short side walls, 4 and 6 are river main side and shore long side walls, respectively. 3 is an upstream side opening, 9 is a downstream side opening, 5 is a main side inclined opening, 7 is a shore side opening, 11 and 12 are straightening vanes, 21 is a connecting bolt hole, and 30 and 31 are stagnation parts. Is.

As shown by the arrow, water flows from upstream to downstream, enters the fish reef unit from the upstream side opening 3 and the mainstream side inclined opening 5, and most of the water flows out from the downstream side opening 9. It is discharged downstream. A part of the water is discharged to the shore through the shore-side opening 7, or enters the auxiliary fish reef unit connected as described later. At this time, the inclination angle θ of the mainstream side inclined opening is preferably in the range of 15 to 85 °. This is because if the inclination angle θ is less than 15 °, the side wall opening side wall becomes thin and it is difficult to form with concrete, and the strength of the opening decreases and it becomes fragile. This is because it becomes difficult to incorporate the main stream into the reef. Inside the fish reef unit, a pair of straightening vanes 11 and 12 are provided so as to be inclined rearward. The water flow becomes slower behind the straightening vanes 11 and 12 and becomes the stagnation portions 30 and 31, so that fish are likely to gather. There may be 1.5 pairs of rectifying plates, that is, three or more, but at least one pair is required.

The inner diameter of the bolt hole is set to be slightly larger than the outer diameter of the bolt. It may be a long hole. This is because when connecting to other fish reef units as will be described later, it is flexible to the unevenness of the river bed.

4 and 5 are a plan sectional view showing another embodiment and a sectional view taken along the line CC of FIG.

The feature of this embodiment is that the current plates 11A and 12A are tapered so as to approach each other in the lower direction.

By doing so, the water flow in the portion close to the bottom can be accelerated, so that the sediment that easily accumulates at the bottom can be discharged to the outside of the fish reef unit.

FIGS. 6 and 7 are a plan sectional view and a horizontal sectional view, respectively, when two fish reef units are connected in a horizontal direction (a direction perpendicular to the water flow) or in a vertical direction. In FIG. 6, the two fish reef units 1 and 1A are fixed by strong bolts and nuts 22 and 22. In this case, the fish reef unit 1A may be the same type fish reef unit, but may be an auxiliary fish reef unit in which some openings 7 are omitted as blinds.

In FIG. 7, the upper and lower fish reef units 1 and 1B do not have to have the same specifications as long as they have the same outer size. That is, in this case, the lower fish reef unit 1B is provided with a tapered straightening plate in which sediment does not easily accumulate, and the upper fish reef unit 1 is the basic type shown in FIG. In this figure, water flows upward from the bottom of the paper.

FIG. 8 is a side sectional view of the top plate 40. Similar to the fish reef unit main body, the top plate 40 is made of reinforced concrete or the like, and has a riverside plant floor 41 that has a concave portion on the upper surface and contains soil or artificial soil such as water-containing plastic. A large number of through holes 42 that penetrate the top plate are provided in the bottom portion thereof. When a riverside plant 44 such as willow, bamboo, bamboo grass, and reed that has the property of forming a root is planted in the through hole 42, the root 45 grows just like a hydroponic culture, just below the water level WL. This root is a perfect spawning site for river fish other than sweetfish, such as haya. In addition, the riverside plants 44 that grow on the top surface provide a place of rest for the ayu and other river fish that blocks direct sunlight, making it a perfect place to hide and hide fish. This area can be inside or outside the fish reef unit as long as it is shaded.

[0028]

[Effect of device]

 By carrying out the present invention, all of the above objects are achieved.

That is, the river fish reef unit of the present invention has a small amount of sedimentation, and in addition to the top plate, it can be in harmony with the nature of the riverside, and can create an environment in which river fish can preferentially collect and multiply.

[Brief description of drawings]

FIG. 1 is a plan sectional view of an embodiment of the present invention.

FIG. 2 is a view on arrow BB in FIG.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a plan sectional view of another embodiment.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a plan cross-sectional view of two fish reef units connected horizontally.

FIG. 7 is a horizontal cross-sectional view of two fish reef units connected vertically.

FIG. 8 is a side sectional view of the top plate.

[Explanation of symbols]

 1 River fish reef unit 2 Upstream short side wall 3 Upstream side opening 4 Main stream side long side wall 5 Main stream side inclined opening 6 Shore long side wall 7 Shore side opening 8 Downstream short side wall 9 Downstream opening 11 Rectifier Plate 12 Rectifier Plate 11A Tapered Rectifier Plate 12A Tapered Rectifier Plate 40 Top Plate 41 Riverside Plant Floor 42 Through Hole 44 Riverside Plant 45 Root WL Water Surface

Claims (4)

[Scope of utility model registration request] 1. A rectangular box-shaped river fish reef unit having a plurality of water flow holes on its side wall, wherein a pair of short side walls are arranged substantially at right angles to the river water flow, and a pair of long side walls. Are arranged almost parallel to the river water flow, and water flow holes are provided on the side wall facing the direction of the water flow at an angle of 15 to 85 °, and at least one pair of straightening vanes are provided in a staggered manner in the rectangular box. A fish reef unit for rivers. 2. The fish reef unit for rivers according to claim 1, wherein at least one pair of staggered straightening vanes are straightening vanes which are tapered in the vertical direction such that they are closer to each other in the downward direction. 3. A rectangular box-shaped river fish reef unit having a plurality of water flow holes on its side wall, wherein a pair of short side walls are arranged substantially at right angles to the river water flow, and a pair of long side walls. Of the auxiliary fish reef units, in which the side walls of the above are arranged substantially parallel to the river water flow, water holes are provided in each side wall, and at least one pair of straightening vanes are staggered in the rectangular box are connected in parallel to the river bank side. 1
Alternatively, the river fish reef unit according to claim 2. 4. The river fish reef unit according to any one of claims 1 to 3, wherein the bottom has a water passage hole, and the top surface has a recess suitable for landing of riverside plants. Free top plate.