JP2001123435A - Water channel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve such problems that a hydraulic jump phenomenon of overflow water is not sufficiently reduced and that a noise accompanied to energy thereof is not sufficiently moderated, even when a downstream sloped face sloped continuously in a direction opposite to a sloped guide face is formed in a lower end part of the sloped guide face, or even when the guide face is formed into a circular arc shape. SOLUTION: In this structure, a sloped water channel face 6 is provided to make the overflow water 5 overflowing through weir main body 2 flow down, a guide bottom 7 is provided to be continued to a lower end of the water channel 6 so as to guide the overflow water 5 to a downstream, a plane straightening plate 8 for restraining hydraulic jump generated when the overflow water 5 falls down to a channel downstream 4 is arranged in a consecutive part for the water channel face 6 and the guide bottom 7 in a downstream thereof with a space 9 for allowing flow-in of the overflow water 5 between the guide bottom 7 and itself, a turbulent area 13 is thereby reduced by being shut in the channel face 6, the guide bottom 7 and the straightening plate 8 once, the energy of the overflow water 5 is reduced, and the hydraulic jump is prevented without worsening the effect for dissipation of the energy to suppress the noise accompanied thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weir facility or dam waterway structure having an inclined waterway part in which falling water overflows and falls from the upstream side of the waterway to the downstream side of the waterway.

[0002]

2. Description of the Related Art Generally, as shown in FIGS.
In a weir (fixed weir) or dam provided in the middle of the waterway, the falling water 5 on the upstream side of the waterway 3 is caused to flow over the inclined guide surface 6 of the weir body 2 to slide, and the falling water 5 falls to the downstream side 4 of the waterway. It is a configuration to make it. In such a configuration, the falling water 5 is
When the water reaches the downstream of the canal, the flow of the falling water 5 changes from the jet stream to the normal stream, causing a water jump phenomenon, and the water surface is violently disturbed. As a result, the surrounding air vibrates to cause a pressure fluctuation, and the turbulence of the water surface causes the mixing of the air and the water, and at that time, the bubbles collapse and the noise is generated.

[0003]

Accordingly, in order to more effectively reduce the energy due to the water jump as described above,
As shown in FIG. 8, near the lower end of the inclined guide surface 6, a downstream inclined surface (also referred to as a reverse inclined water tap) 30 that is gently and continuously inclined in a direction opposite to the inclined guide surface 6 is formed. As shown in the figure, a configuration has been proposed in which the inclined guide surface 6 is formed in an arc shape so as to reduce the energy accompanying the water jumping phenomenon of the falling water 5. However, simply forming the downstream inclined surface 30 or forming the inclined guide surface 6 in an arc shape is insufficient from the viewpoint of energy deenergization, and accordingly, the noise is not sufficiently reduced. .

Therefore, an object of the present invention is to provide a water channel structure that can solve the above-mentioned problems.

[0005]

Means for Solving the Problems In the present invention, there is provided an inclined channel surface for dropping flowing water from the upstream of the channel to the downstream of the channel, and guides the flowing water downstream from the lower end of the inclined channel surface. A rectifying plate for suppressing water jump generated when the flowing water falls to the downstream side of the water channel, and a gap enough to allow the flowing water to flow between the rectifying plate and the guiding bottom below the rectifying plate. It is located at the continuation of the inclined waterway surface and the guide bottom.

The distance between the guide bottom and the rectifier plate is such that flowing water flowing from between the guide bottom and the rectifier plate flows as overflow water from the downstream side to the upstream side of the upper surface of the rectifier plate, and the overflow water flows from the upper surface of the rectifier plate to the upper surface. Is set to be able to flow in from the upstream end to the downstream side. According to the above configuration, when the flowing water falls down the inclined channel surface from the upstream of the channel to the downstream of the channel, and when the flowing water is guided downstream with the guide bottom continuous to the lower end of the inclined channel surface, the flow straightening plate and the guide bottom are Since overflowing water flows in between, it is possible to confine turbulence accompanied by energy demagnetization, so that turbulence on the water surface due to the water jump phenomenon is prevented, and noise is suppressed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. First, a first embodiment of the present invention will be described with reference to FIGS. The waterway structure 1 according to the first embodiment of the present invention is used for a weir, for example, and flows from a waterway upstream side 3 of a weir body 2 (see FIG. 6) to a waterway downstream side 4 (hereinafter, referred to as falling water). 5 and a guide bottom 7 for guiding the falling water 5 further downstream from the lower end of the inclined waterway 6.
have.

[0008] Then, a flat plate-shaped rectifying plate 8 for suppressing water jump generated when the falling water 5 falls to the downstream side 4 of the water channel flows the falling water 5 between the straightening plate 8 and the guide bottom 7 below. Waterway 6 and guide bottom 7 with a gap 9 enough to allow
Are arranged in a continuous portion. The current plate 8 has a channel width 1.
1 and the distance between the guide bottom 7 and the rectifying plate 8 is such that the falling water 5 flowing from between the guide bottom 7 and the rectifying plate 8 is directed from the downstream side of the upper surface of the rectifying plate 8 to the upstream side. The overflow water 5a is set so that the overflow water 5a can flow from the upstream end of the upper surface of the current plate 8 to the downstream side. That is, the current plate 8 has a front end 10
However, the falling water 5 and its overflow water 5a are positioned above the lower end of the inclined channel surface 6 so that they smoothly merge at a point P located above the lower end of the inclined channel surface 6.

In the above configuration, the falling water 5 overflows from the weir main body 2 side and falls along the inclined channel surface 6 from the upstream channel 3 to the downstream channel 4. When the falling water 5 reaches the guide bottom 7, the flow straightening plate 8 guides the falling water 5 to the inclined waterway surface 6 with an interval 9 enough to allow the inflow between the falling water 5 and the guide bottom 7. Since it is arranged in a continuous portion of the bottom 7, the falling water 5 smoothly flows between the current plate 8 and the guide bottom 7. In the process of flowing from the inclined waterway 6 to the guide bottom 7, the falling water 5 changes from a jet stream to a normal stream, and there is a condition that the falling water 5 generates a water jumping phenomenon. Since the rectifying plate 8 is disposed in the area, the area shown by the imaginary line in FIG. 2, that is, the falling water 5 is once trapped in the inclined waterway surface 6, the guide bottom 7 and the rectifying plate 8, and the overflow water 5a is rectified. The water flows from the upstream end of the upper surface of the plate 8 toward the downstream side, and the turbulence of the water surface seen by the water jump phenomenon is suppressed. Therefore, noise is reduced, and a part of the falling water 5 that has passed between the straightening plate 8 and the guide bottom 7 returns from the upper surface side of the straightening plate 8 to the inclined waterway surface 6 side. It falls from the tip 10 and joins the falling water 5 falling from the inclined waterway surface 6.

As described above, according to the first embodiment of the present invention, the falling water 5 is caused to flow between the straightening plate 8 and the guide bottom 7, and the flow of the falling water 5 is straightened by the straightening plate 8. ,
Noise due to jumping water can be suppressed without impairing the energy deenergizing function. Next, a second embodiment of the present invention will be described with reference to FIGS. The waterway structure 1 according to the second embodiment of the present invention is provided at a continuous portion between the inclined waterway surface 6 and the guide bottom 7 in order to obtain a water depth required for the guide bottom 7 at a continuous portion between the inclined waterway surface 6 and the guide bottom 7. A recess 20 is formed in the guide bottom 7, and the other configuration is the same as that of the first embodiment.

In this configuration, the falling water 5 flows between the current plate 8 and the guide bottom 7, and the falling water 5
Flows to the downstream side of the water channel 4 as shown in the figure,
A part thereof is slightly disturbed in a range surrounded by an arc on the lower surface side of the current plate 8. Therefore, similar to the first embodiment, the water jump phenomenon is suppressed and the sound is muted. Other functions and effects are the same as those in the first embodiment, and a description thereof will be omitted.

Next, a third embodiment of the present invention will be described with reference to FIG. In the waterway structure 1 according to the third embodiment of the present invention, the flat rectifying plate 8 for suppressing the jumping water generated when the falling water 5 falls to the downstream side 4 of the waterway is provided with the falling water 5 below it. A water control member (also referred to as a baffle) 2 is disposed on a continuous portion of the inclined waterway surface 6 and the guide bottom 7 with a space 9 enough to allow inflow between the guide bottom 7 and the lower surface of the current plate 8.
The water control member 25 is similarly arranged on the guide bottom 7 facing the current plate 8. The other configuration is the same as in the first embodiment, and a description thereof will be omitted.

In the above configuration, when the falling water 5 falls from the upstream side 3 of the channel to the downstream side 4 of the channel along the inclined channel surface 6 and the falling water 5 reaches the guide bottom 7, the rectifying plate 8 is moved downward. The falling water 5 is arranged at a continuous portion of the inclined waterway surface 6 and the guiding bottom 7 with a space 9 enough to allow the inflow of the falling water 5 between the guiding bottom 7 and the falling water 5. And between the guide bottom 7. Here, the falling water 5 is provided with a condition of a water jumping phenomenon. However, since a straightening plate 8 is disposed in a continuous portion of the inclined waterway surface 6 and the guide bottom 7, an area shown by a virtual line in FIG.
That is, the falling water 5 is once confined in the inclined waterway surface 6, the guide bottom 7, and the rectifying plate 8, and the turbulence of the water surface seen by the turbulent jumping phenomenon is suppressed, the rectifying plate 8 rectifies the water, and the occurrence of the water jumping phenomenon is prevented. Therefore, noise is suppressed. Other functions and effects are the same as those of the first embodiment.

In each of the above-described embodiments, the position of the current plate 8 is fixed. However, the present invention is not limited to this, and the current plate 8 can be moved up and down in accordance with the amount of the falling water 5. It may be. Further, in each of the above-described embodiments, the straightening plate 8 is configured such that the tip 10 has the falling water 5 that falls from the inclined channel surface 6 to the downstream side 4 and the upstream side 3 from the upper surface of the straightening plate 8.
It is positioned above the lower end of the inclined waterway surface 6 so that the falling water 5 returning to the lower part of the inclined waterway surface 6 smoothly merges at a point P located above the lower end portion of the inclined waterway surface 6, but is not limited thereto. In a range where the falling water 5 falling from the road surface 6 to the downstream side 4 and the falling water 5 returning to the upstream side 3 from the upper surface of the straightening plate 8 smoothly merge, the front end portion 10 of the straightening plate 8 is close to the guide bottom 7. It may be positioned to be located.

[0015]

As is apparent from the above description, the present invention provides an inclined channel surface for flowing water to fall from the upstream of the channel to the downstream of the channel, and guides the flowing water downstream from the lower end of the inclined channel surface. A rectifying plate for suppressing the water jump generated when the flowing water falls to the downstream side of the water channel has a gap below the guide bottom for allowing the flowing water to flow between the guiding bottom and the guiding bottom. In this case, the flowing water is disposed at a continuous portion between the inclined waterway surface and the guide bottom, so that when the flowing water is guided downstream at the guiding bottom continuous to the lower end of the inclined waterway surface, the flowing water is formed between the inclined waterway surface and the guiding bottom. While being rectified by the rectifying plate arranged in the continuous portion, the flowing water flowing from between the guide bottom and the rectifying plate flows as overflow water from the downstream side to the upstream side of the rectifying plate upper surface, and this overflow water is formed on the rectifying plate upper surface. Since the water flows from the upstream end to the downstream side, Hydraulic jump phenomenon angle due to the changes of the guiding bottom and can be prevented, thus it is possible to suppress the noise.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a main part of a waterway structure showing a first embodiment of the present invention.

FIG. 2 is a side view of a state in which falling water is once contained in a current plate and a guide bottom.

FIG. 3 is an enlarged perspective view of a main part of a water channel structure according to a second embodiment of the present invention.

FIG. 4 is an enlarged side view of the main part.

FIG. 5 is an enlarged side view of a main part of a water channel structure according to a third embodiment of the present invention.

FIG. 6 is a schematic side view of a main part of a water channel structure using a conventional weir.

FIG. 7 is a schematic side view of a main part of a water channel structure using a conventional dam.

FIG. 8 is a side view showing a state in which a downstream inclined surface is formed near the lower end of the inclined guide surface.

FIG. 9 is a side view of a main part showing a zero in which the inclined guide surface is formed in an arc shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterway structure 2 Weir main body 3 Waterway upstream 4 Waterway downstream 5 Falling water 6 Inclined waterway surface 7 Guide bottom 8 Rectifier plate 10 Tip of rectifier plate

Claims (2)

[Claims] 1. A water channel having an inclined channel surface for flowing water to fall from an upstream of the channel to the downstream of the channel, and a guide bottom disposed continuously at a lower end of the inclined channel surface to guide the flowing water downstream. A rectifying plate for suppressing water jump generated when the flowing water falls to the guide bottom, wherein the sloping plate is provided with a gap below the rectifying plate so as to allow flowing water to flow into the guiding bottom. A water channel structure which is arranged at a continuous portion between a road surface and a guide bottom. 2. The distance between the guide bottom and the rectifier plate is such that flowing water flowing from between the guide bottom and the rectifier plate flows as overflow water from a downstream side of the upper surface of the rectifier plate to an upstream side, and the overflow water flows into the upper surface of the rectifier plate. The water channel structure according to claim 1, wherein the water channel structure is set so as to be able to flow in from the upstream end to the downstream side.