JPS629687B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a weir, and more particularly to an undulating weir made of a flexible membrane that prevents noise from overflowing water falling.

(Prior art and its problems) When a residence, etc. is adjacent to the installation site of a flexible membrane undulating weir, conventional measures are generally not taken to prevent or reduce the noise caused by falling overflow water. Because there is no such thing, it may become a problem as noise pollution. Furthermore, Fig. 1 shows a conventional undulating weir made of a flexible membrane, and 1 in the figure shows an envelope (bag-like body) made of a flexible membrane, for example, rubberized cloth.
10 is an inlet/exhaust (water) pipe communicating with the envelope, 7 is an expansion medium such as air or water, 8 is overflow water, 9 is a river bed, and the envelope sends the expansion medium to expand and rise. The expansion medium can be discharged to deflate and collapse (for example, Japanese Patent Publication No. 40-11702)
(See Special Publication No. 44-2371).

(Structure of the Invention) In view of the above, the present invention provides a method for preventing this noise. The invention will now be explained in detail with reference to the illustrative drawings, but the invention is not limited thereto.

FIG. 2 is a diagram illustrating a flexible membrane undulating weir to which the present invention is applied, cut along the river flow direction, and FIG. 3 is a plan view thereof.

In the present invention, a flexible membrane 2, such as rubberized cloth, cloth, polyethylene sheet, etc., is adhered to the entire length or part of the transverse direction near the top of the weir body 1 formed by the flexible membrane envelope. The other end is fixed to the riverbed downstream from the point where the overflow water falls. 5,6
indicates the above fixed part.

The flexible membrane 2 is provided with an inlet 3 and an outlet 4 of a size and number that allow most of the overflow water to flow in and out at two locations near the weir top and near the fixed part of the river bed. At times, overflow water is transferred to the inlet 3 near the weir top fixed part 5.
This water is allowed to flow out from the outlet 4 near the downstream fixed part 6, and the sound of this overflow water falling is blocked by the flexible membrane 2, thereby reducing noise to the outside of the weir body. can be reduced.

Note that the inlet 3 and outlet 4 are as shown in Fig. 3.
Either open the hole in the flexible membrane 2 itself or
As shown in the figure, three flexible membranes 2a, 2b, 2c may be connected, for example, by a belt 11 or the like, that is, they may be cut. Alternatively, a rigid plate that cannot be folded may be used as the flexible membrane 2 for noise isolation, and in this case, there is no need to fix the end of the rigid plate to the riverbed. The rigid plate may be, for example, a rubber plate containing steel cord, a steel plate, or the like.

(Effects of the Invention) According to the present invention as described above, since a sound insulating film is provided in the downstream part of the weir body, the sound of overflowing water falling is blocked. Therefore, noise caused by overflow water is reduced.

[Brief explanation of the drawing]

In the diagrams showing the flexible membrane undulating weir cut in the river flow direction, Figure 1 is the conventional one, Figure 2 is the
The figures each illustrate the invention. FIG. 3 is a plan view of the one shown in FIG. 2, and FIG. 4 is another example of the invention corresponding to FIG. 1... Weir body formed by a flexible membrane envelope, 2...
Flexible membrane, 3... Inlet, 4... Outlet, 5, 6
... Fixed part, 7 ... Expansion medium, 8 ... Overflow water, 9
...River bed, 10...Inlet/exhaust (water) pipe, 11...
belt.

Claims (1)

[Scope of Claims] 1. A flexible membrane envelope forming a weir body is attached to a river bed in a direction transverse to the river flow, and a fluid serving as an expansion medium is introduced into the envelope to inflate and erect it. In a weir that discharges the expansion medium fluid from inside the envelope to cause the weir to contract and collapse, a sound insulating surface is formed over the entire length or part of the envelope that forms the weir body when the weir is expanded in the direction across the river flow. A sound insulating surface is formed by fixing one end of the means for forming the sound insulating surface in advance, fixing the other end on the downstream side or leaving it unfixed, and providing the means for forming the sound insulating surface with an inlet and an outlet for water in advance. An undulating weir made of a flexible membrane, characterized in that it guides water to the lower side of the means to prevent and reduce noise caused by overflowing water. 2. The means for forming the sound insulating surface is a flexible membrane,
2. The flexible membrane undulating weir according to claim 1, wherein the upstream end is fixed to the envelope forming the weir body, and the downstream end is fixed to the river bed. 3. Claim 1 in which the means for forming the sound insulation surface is a rigid plate, the upstream end of which extends to the envelope forming the weir body, and the downstream end of which extends downstream. The described flexible membrane undulating weir. 4. The flexible membrane undulating weir according to claim 1, wherein the means for forming the sound insulation surface has a water inlet provided in advance on the weir top side and a water outlet on the river bed side. . 5. The flexible membrane undulating weir according to claim 1, wherein the position where the means for forming the sound insulating surface is fixed to the envelope is near the top of the weir body. 6. The flexible membrane undulating weir according to claim 1, wherein the inlet and outlet are hole-shaped. 7. The flexible membrane undulating weir according to claim 1, wherein the inlet and outlet are cut-shaped.