JP7224602B2 - river structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a river structure capable of preventing flooding of a river when the water level rises, and more particularly, to a river structure capable of preventing the collapse of embankments at places prone to flooding.

In recent years, due to the effects of global warming, guerrilla downpours have become more frequent in urban areas, etc., and embankment construction on riverbeds has turned rivers into ceiling rivers, exacerbating damage caused by river flooding. is becoming

In order to prevent such flooding of rivers, there are methods such as increasing the height of riverbed embankments and deepening riverbeds by scraping off the sediment from the riverbed. Since the countermeasures are taken during the project construction, there is a problem that not only does it take time to take these countermeasures, but also a huge amount of money is incurred.

Japanese Patent Application Laid-Open No. 2020-16061

On the other hand, when a river overflows, the levee is partially scraped away from places where water is relatively likely to concentrate or where the levee is weak. It is known that it will eventually cause a large flood damage.

For this reason, if it is possible to prevent the collapse of the levee in its initial state at places where flooding is likely to occur, instead of constructing a large embankment, it is possible to prevent a large amount of river flooding damage.

Therefore, in order to solve the above problems, an object of the present invention is to provide a river structure that can prevent the collapse of the initial state of the embankment at the location where the river is likely to overflow.

That is, in order to solve the above-mentioned problems, the present invention provides a groove body which is provided at a position higher than the riverbed and which allows the water of a swollen river to pass through; A tapered portion is provided at a high position for collecting water in the horizontal direction into the groove.

With this construction, when the water level is low, the water can flow below the groove, and only when the water rises and the water level rises above the groove, the tapered portion is used to form the embankment. The side water can be collected in the central groove body, the amount of water hitting the embankment can be reduced, and the collapse of the embankment in its initial state can be prevented.

Further, in such an invention, the groove body is supported by a columnar body erected on the riverbed.

With this configuration, the large load applied to the groove can be supported by the columnar body.

Alternatively, the groove body is supported by being suspended from above the river.

With this configuration, the groove body can be easily installed without performing riverbed construction or the like.

Further, the channel is constructed from independent channel elements, which are connected in an overlapping manner.

With this configuration, the length of the groove can be changed arbitrarily, and the transportation and installation work at the time of installation can be facilitated.

Further, the groove body is configured by connecting a plurality of independent groove body elements each having a large inner width on the upstream side and a small inner width on the downstream side. connecting the downstream ends of the side channel elements in an overlapping manner.

With this structure, the water flowing through the groove elements does not leak from the connecting portions of the groove elements, and the groove elements can be easily connected.

Also, the groove element is made of plastic.

With this configuration, the weight of the groove element can be reduced, and by using, for example, waste plastic, it is possible to recycle garbage, thereby addressing environmental problems.

Further, driftwood prevention means for preventing driftwood from entering the taper portion is provided on the upstream side of the taper portion.

With this configuration, it is possible to prevent driftwood from entering the groove and reduce the load applied to the groove.

According to the present invention, a groove body is provided at a position higher than the riverbed and through which the water of a swollen river can pass; Since the tapered portion is provided for collecting the water in the direction to the groove body, when the water level is low, the water can flow below the groove body, and the water rises from the groove body. Only when the water level rises upward, the tapered portion allows the water on the embankment side to be collected in the central groove. As a result, the amount of water hitting the embankment can be reduced to prevent the embankment from collapsing in its initial state.

A diagram showing a river structure showing an embodiment of the present invention (low water level state) Diagram showing the planar state of the river structure in the same configuration A diagram showing the side of the low water level state in the same configuration A diagram showing a side view of the same form in a state of rising water A view of the rising water level in the same configuration as seen from the direction of flow The figure which shows another example of the driftwood prevention means in the same form. A diagram showing an example of another support in the same form A diagram showing another connection method of the groove element in the same form.

An embodiment of the present invention will be described below with reference to the drawings.

The river structure 1 in this embodiment is designed to reduce the amount of water hitting the embankment 62 by directing the water in the upper layer of the river from the side of the embankment 62 to the center side, as shown in FIG. 2, the groove body 2 is provided in a state of floating above the riverbed 61, and the upstream end of the groove body 2 (see FIG. 2) is provided to collect the water on the embankment 62 side into the groove body 2 on the central side. A tapered portion 3 is provided. With this configuration, when the water level is low (the state shown in FIG. 1), the water flows below the groove body 2, and when the water level rises (the state shown in FIG. 5). ) collects the water on the side of the embankment 62 to the center and flows it into the groove body 2, thereby preventing the embankment 62 from breaking in the initial state and preventing the flooding of the river. . BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail.

First, the groove body 2 is provided by connecting a plurality of groove body elements 21, and as shown in FIGS. is configured. As shown in FIG. 2, the side wall 23 has, for example, a wide inner opening width on the upstream side (front end side) and a relatively narrow inner opening width on the downstream side (rear end side). there is When connecting these groove elements 21, the rear end portion 26 of the upstream groove element 21 is placed on the front end portion 25 of the downstream groove element 21 from above. The groove elements 21 are connected while overlapping each other. A flange portion 24 formed by bending the side wall 23 is provided at the upper edge of the side wall 23 of the groove element 21, and a suspended body 42 such as a wire (FIG. 7) is inserted into a hole portion 27 of the flange portion 24. See), etc. can be attached. Such a groove element 21 is made of plastic, reinforced polystyrene foam, lightweight concrete, etc., in addition to a metal plate or a wooden board. By doing so, it is possible to facilitate transportation and installation, and when waste plastic is used, there is also the advantage that it is possible to contribute to environmental problems by reusing garbage.

Such a groove 2 is suspended from the river bottom 61 by the support 4, and is attached so that the bottom 22 is located at a position about 0.5 m to 2 m lower than the dangerous water level. When fixing to such a support 4, the first method uses a method of attaching the groove 2 to a columnar body 41 erected on the riverbed 61, as shown in FIG. Such columnar bodies 41 are provided at regular intervals along the riverbed 61, and are fixed with anchor bolts in a state in which the groove element 21 is placed on the upper surface thereof.

As a second method, as shown in FIG. 7, the groove element 21 can be suspended and supported from above the river by a suspension body 42 such as a wire. When the groove element 21 is supported by such a suspension body 42, the suspension body 42 is suspended from a metal body 43 such as a wire along the width direction of the river so that the groove element 21 can be supported. When the groove element 21 is supported by the hanging body 42, a wire is attached to the hole 27 provided in the flange portion 24 so as to hang down.

A tapered portion 3 as shown in FIG.

This tapered portion 3 is formed in front of the groove body 2 so that the water from the upstream is drawn toward the center from the bank 62 side, and like the groove body 2, it is made of a metal plate, a wooden board, a plastic, or the like. be done. Then, like the groove body 2, it is supported by a support body 4 such as a columnar body 41 erected on the riverbed 61. - 特許庁The left and right end portions of the tapered portion 3 may be provided so as to be in close contact with the embankment 62, or may be provided at positions slightly separated from the embankment 62. As shown in FIG. At this time, if the embankment 62 is provided at a position slightly away from the embankment 62, the flowing trees and garbage can flow between the tapered part 3 and the embankment 62, and the embankment 62 can be reinforced.

Moreover, when the groove body 2 and the tapered portion 3 are provided in this way, driftwood flowing from the upper stream hits it, and the load and water resistance cannot be endured. Therefore, here, as shown in FIG.

As the driftwood prevention means 5, in a first example, as shown in FIG. 2, a mesh body 51 made of metal is provided on the upstream side perpendicular to the flow direction, and the driftwood is brought into contact with the mesh body 51 to block it. can be considered. Alternatively, as shown in FIG. 6, which is a second example, a reverse tapered portion 3 may be provided to bring the driftwood closer to the embankment 62 side. If such a reverse tapered portion 3 is provided, the water of the river is drawn toward the embankment 62, so there is a possibility that the embankment 62 will be scraped off and the river will overflow. Therefore, the reverse tapered portion 3 is also formed of the mesh body 52 so that water can flow in the direction of flow and driftwood, garbage, etc. can be moved toward the embankment 62 side.

Next, the operation of the river structure 1 constructed in this manner will be described.

First, when the water level is low and the water is flowing, the water flows below the groove body 2 .

On the other hand, when the water level rises above the bottom 22 of the groove body 2 due to a sudden increase in water, as shown in FIGS. The water comes to pass through the groove body 2. - 特許庁At this time, since water from the left and right direction concentrates on the groove body 2 , the height of the side wall 23 of the groove body 2 is set to a height corresponding to the water drawn by the taper portion 3 .

In addition, when the driftwood prevention means 5 is provided on the upstream side, the driftwood prevention means 5 blocks the driftwood, garbage, etc., and the vertical mesh body 51 (FIG. 4) and the reverse taper portion 3 are blocked. The mesh body 52 (FIG. 6) collects driftwood and garbage to the embankment 62 side. If the driftwood can be pulled toward the embankment 62 by the reverse tapered portion 3 and passed through the gap between the tip of the tapered portion 3 and the embankment 62, the embankment 62 can be reinforced by the driftwood.

Then, with the driftwood removed, the water that originally flows along the embankment 62 is passed through the groove body 2, and at a point where the possibility of flooding has disappeared, the water is discharged from the groove body 2 to the original river. let me put it back.

As described above, according to the above-described embodiment, the groove body 2 is provided at a position higher than the river bottom 61 and allows the water of the swollen river to pass through, and the upstream end of the groove body 2 at the river bottom 61 Since the tapered portion 3 is provided at a position higher than the groove body 2 to collect the water in the horizontal direction into the groove body 2, when the water level is low, the water can be collected below the groove body 2. In addition, only when the water level rises above the groove body 2, the tapered part 3 can collect the water on the embankment 62 side into the central groove body 2. - 特許庁This makes it possible to reduce the amount of water hitting the embankment 62 and prevent the embankment 62 from collapsing in its initial state.

It should be noted that the present invention is not limited to the above embodiments, and can be implemented in various modes.

For example, in the above-described embodiment, the groove elements 21 are connected only in the flow direction of the river, but as shown in FIG. 8, the groove elements 21 may also be connected in the width direction of the river good. By constructing in this way, it becomes possible to draw water to the groove body 2 corresponding to a wide river. When connecting the groove elements 21 in the width direction, it is preferable to connect the groove elements 21 by passing bolts through the holes 27 provided in the flange portion 24 .

In the above-described embodiment, the opening width of the front end portion 25 of the groove element 21 is widened and the opening width of the rear end portion 26 is narrowed. good too. In this case, since a gap is generated at the connecting portion and water leakage occurs, it is preferable to attach a plate or the like to fill the gap which is the boundary portion.

Reference Signs List 1 River structure 2 Groove 21 Groove element 22 Bottom 23 Side wall 24 Flange 25 Front end 26 Rear end 27 Hole portion 3 Taper portion 31 Front end portion 4 Support body 41 Columnar body 42 Hanging body 43 Metal body 5 Driftwood prevention means 51・Mesh body 52 Mesh body 61 River bottom 62 Embankment

Claims (7)

a groove body provided at a position higher than the river bottom and capable of allowing the water of the swollen river to pass through;
a tapered portion provided at an upstream end of the groove body and at a position higher than the riverbed for collecting water in the horizontal direction into the groove body;
A river structure characterized by providing a 2. The river structure according to claim 1, wherein said grooves are attached so as to be supported by columnar bodies erected on the riverbed. 2. The river structure according to claim 1, wherein said groove is suspended from above the river. 2. The river structure according to claim 1, wherein said grooves are composed of independent groove elements, which are provided in an overlapping state. The groove body is formed by connecting a plurality of independent groove body elements each having a large inner width on the upstream side and a small inner width on the downstream side. 2. The river structure according to claim 1, wherein the downstream end of the upstream channel element is overlapped . The groove body is formed by connecting a plurality of independent groove body elements having a large inner width on the upstream side and a small inner width on the downstream side,
2. River structure according to claim 1, characterized in that said channel elements are made of plastic. 2. The river structure according to claim 1, further comprising driftwood prevention means for preventing driftwood from entering said taper portion on the upstream side of said taper portion.

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