JPS5841367B2 - How to prevent the noise of overflowing water from a weir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing noise caused by water overflowing a weir and falling.

If there is a residence adjacent to the installation site of a weir, such as a undulating weir made of flexible membrane, it may be a problem as noise pollution as conventional weirs generally do not take measures to prevent the sound caused by falling overflow water. It may become

The present invention relates to a method for preventing this noise.

The invention will now be explained in detail with reference to the illustrative drawings.

However, it is not limited to this. 1 and 2 are cross-sectional views in the longitudinal direction of a river of an example in which the present invention is applied to an undulating weir made of a flexible membrane, for example, a rubber-coated cloth.

In addition, a flexible membrane undulating weir is one in which, for example, a rubber-coated cloth envelope (bag-like body) is attached to the river bed in the direction across the river, and air or water is fed into the envelope to cause it to expand and rise. (For example, Special Publication No. 40-11702, Special Publication No. 44-2371)
(see issue).

In these figures, 1 is the river bed surface on which the weir body is attached, 2 is the main body of the weir body made of a flexible membrane envelope, 3 is the support column fixed to the top of the weir body,
4 is a linear body such as a linear body or a rod-shaped body.

5 indicates a rectifying sheet, and 6 indicates overflow water.

That is, in the present invention, as a method for preventing noise caused by overflowing water of a undulating weir made of a flexible membrane, a plurality of supports 3 are arranged and fixed along the entire length of the top of the weir body 2 in the transverse direction as shown in FIG. A filamentous body 4 such as a wire rope is tensioned between each support, and the upstream end of a rectifier sheet, for example a rubberized cloth sheet 5, continuous in the transverse direction is attached to the filamentous body 4, so that at least the downstream end can absorb overflow. Extend it to the downstream side of the point where it falls and release it.

The installation height of the filament body 4 is approximately the middle of the normal overflow water 6.

In this way, the overflow water is divided into two by the straightening sheet, so that the turbulent flow during falling is further rectified, and the falling resistance is increased, so the falling speed is reduced, and noise caused by overflowing ice falling can be prevented.

Further, the diffusion of the falling noise below the rectifier sheet is blocked by the rectifier sheet.

In Figure 2, there are no supports on the weir body as in Figure 1.

This is an example in which the striatum 4 is directly tensioned between both banks, and the rest is the same as the case in FIG. 1.

The layers described above are for an undulating weir made of flexible membrane.

In the present invention, the weir can also be applied to the case of a falling weir 7 made of steel and a fixed weir 8 made of, for example, concrete, as shown in FIGS. 3 and 4.

In these figures, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

As explained above, the present invention can easily prevent noise.

[Brief explanation of drawings]

The figure shows a weir cut in the direction of river flow to which the noise prevention method of the present invention is applied, even if it collapses. Figure 1 shows the case where a support is provided at the top of a undulating weir made of a flexible membrane. Figure 2 shows a flexible membrane undulating weir similar to Figure 1, but without a support at the top of the weir, Figures 3 and 4 show other examples of the present invention, and Figure 3 shows a steel overturning weir. In the case of , Figure 4 illustrates the case of a fixed weir made of concrete. 1... Riverbed surface on which weir body is attached, 2... Weir body, 3... Support column, 4... Linear body, 5...
... rectifier sheet, 6 ... overflow water, 7 ...
...Steel tipping weir, 8...Fixed weir.

Claims (1)

[Scope of Claims] 1. A thin strip such as a wire or rod is passed along the weir over the top of the weir, and a rectifying sheet is attached to the wire to divide the overflow water into two and allow it to fall. A method for preventing the noise of falling water from overflowing a weir, characterized by preventing the noise of flowing water. 2. A weir according to claim 1, in which a plurality of struts are arranged and fixed on the top of the weir body and the struts are used to pass the filament over the top of the weir body along the weir body. How to prevent overflow water falling noise. 3. A method for preventing overflow water falling noise of a weir as set forth in claim 1, which involves passing a striated body along the weir body over the top of the weir body by tensioning the striated body between both banks. . 4. The method for preventing overflow water falling noise of a weir according to claim 1, wherein the weir is an undulating weir made of a flexible membrane. 5. The method for preventing overflow water falling noise of a weir according to claim 1, wherein the weir is a steel overturning weir. 6. The method for preventing overflow water falling noise of a weir according to claim 1, wherein the weir is a fixed weir made of concrete.