JP2006070531A - Fish nest block for river - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fish nest block for a river securing good environment for fish to live and facilitating regeneration even if the river bottom is flattened by concrete construction work. <P>SOLUTION: In the fish nest block installed at the river bottom in parallel with a stream from the upper reaches to the lower reaches of the river, a slant face plate inclining downward in an upstream direction is connected to the upstream end of a top plate, and a leg piece is hangingly provided at the width center over both the top plate and slant face plate to provide habitable spaces of fishes on both sides of the leg piece. The lower end faces of the leg part piece and slant face plate are formed in the same or almost the same height positions so that the lower end of the leg piece and the lower end of the slant face plate serve as the ground plane. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fish nest block for a river installed at the bottom of a river.

    Rivers are home to a variety of fish, including crucian carp, carp, ayu, eel, eel, loach, and catfish. Currently, however, environmental destruction such as revetment work, river repair, water pollution, and release of alien species As a result, there is a critical trend that decreases significantly. In addition, fish that can no longer inhabit are forced to seek a place of life upstream of nature, apart from sweetfish and trout that place their place of life temporarily in the sea. There is a serious problem that will end.

  In the case of revetment work or river renovation, the flow of water is simply made uniform, so there is no place for fish and no spawning, and no fish are caught. In particular, if concrete blocks are laid not only on the riverbank but also on the riverbed, most fish can't live at all. Moreover, due to the concrete spread, it is almost impossible to restore this to the original natural environment. Therefore, the environment where river fish can live is gradually narrowing.

  In view of the above circumstances, the present invention provides a fish nest block for a river that can provide a comfortable environment for fish and can be easily regenerated even if the riverbed is flattened by concrete work. Was an issue.

  In order to solve the above-described problems, the present invention is a fish nest block installed on the bottom of a river in parallel with the flow from upstream to downstream, and a slope plate inclined downward in the upstream direction is connected to the upstream end of the top plate. A leg piece is vertically suspended at the center of the width of both the top plate and the slope plate, and a space for fish is provided on both sides of the leg piece. The present invention provides a fish nest block for rivers characterized in that both lower ends are formed at the same or almost the same height so that the lower ends are both ground contact surfaces.

  Since the fish nest block for rivers is configured as described above, vertical and horizontal ground contact surfaces are formed at the lower ends of both the leg piece and the slope plate, thereby providing a stable installation state. Therefore, if the slope plate is installed on the river bottom with the river face up, the water stream will run on the slope plate, and the fish nest block will be pressed downward, so it will be swept away or overturned by the water flow. Without a stable position as a fish nest. In addition, since contaminants such as dead branches drifting from the upstream ride on the top plate with the water flow from the slope plate and are discharged downstream, the inconvenience of entering the space on both sides of the leg piece is prevented. In addition, even if foreign matter, gravel, stones, etc. enter, it is eliminated by being sucked by the fast water flow on both sides, so that the space is maintained as a stable place for fish.

  As explained above, according to the fish nest block for rivers of the present invention, the inconvenience of being swept away or overturned by the water flow despite the easy installation is prevented, and the space where the fish is housed is safe. Even if the riverbed is flattened by concrete work, there is an excellent effect that an environment where fish can live is obtained and can be revived easily.

  Next, embodiments of the present invention will be described with reference to the drawings.

  The drawing shows an embodiment, and the fish nest block P for the river is formed of concrete. The shape of the fish nest block P is connected to the upstream slope plate 3 on the upstream end of the top plate 1. The leg piece 5 is suspended from both the top plate 1 and the slope plate 3 at the center of the width, and spaces 7 are provided on both sides thereof. Moreover, the lower end surfaces 9 and 10 of both the leg piece 5 and the slope plate 3 are formed on the same surface at the T-shaped intersection.

It is installed stably so that it does not fall down due to the grounding of the lower end surfaces 9 and 10 at the vertical and horizontal intersections. However, in the installation, the slope plate 3 is placed on the upstream side. Since it rides up and escapes and the fish nest block is pressed downward, inconveniences such as being swept away or overturned even if the water flow becomes strong are prevented.

  Looking at the internal spaces 7 and 7, since the momentum of water is blocked by the slope plate 3, it can be made a safe place for fish. Furthermore, when the riverbed is flat with concrete or the like, the spaces 7 and 7 are easily maintained as they are, but even the riverbed of gravel, stone, or the like is prevented from flowing in by the slope plate 3, and the dead branches The inflow of impurities such as is also prevented.

  In addition, since the water flow is turned to both sides by the slope plate 3, relatively fast water flows F and F are generated on both sides, and the water pressure is low due to the flow velocity. It is sucked out so as to be caught in the fast outer water streams F and F, and this also provides a place where the fish 7 can rest assured without filling the spaces 7 and 7.

  In addition, although the leg piece 5 was formed on the ridge, a cutout or a hole may be provided in the left and right spaces 7 and 7 so that the fish can interact with each other. A protrusion may be partially formed on the lower end surfaces 9 and 10 so as to bite into the installation location.

It is a perspective view of a fish nest block for rivers showing one embodiment of this invention. It is a side view of the fish nest block for the river. It is sectional drawing of the AA arrow of FIG.

Explanation of symbols

P Fish nest block for river 1 Top plate 3 Slope plate 5 Leg piece 7 Space 9 Lower end surface of leg piece 10 Lower end surface of slope plate

Claims (1)

  A fish nest block installed at the bottom of a river in parallel with the flow from upstream to downstream, and a slope plate that is slanted in the upstream direction is connected to the upstream end of the top plate, and the center of the width extends across both the top plate and the slope plate. Both leg portions are provided so that a space for fish is provided on both sides of the leg piece, and the lower end of the leg piece and the lower end of the slope plate are both ground contact surfaces. A fish nest block for rivers, characterized in that the lower end surface of is formed at the same or almost the same height.