JPS60112913A - Undulating weir made of flexible film - Google Patents

Abstract

PURPOSE:To prevent the generation of falling-down noise generated by overflow water, by a method wherein the one end of a rigid plate, having so sufficient rigidity that it can not be folded, and plural holes, is secured to a cover forming a portion on the downstream side of a weir. CONSTITUTION:The one end of a rigid plate 2, such as steel cord-reinforced rubber plate or steel plate, having so sufficient rigidity that it is unfoldable, is secured to a spot in the vicinity of a part 6 which is folded in two parts when a cover 1 made of a flexible film turns down. This, since overflow water flows in through holes 12 and flows out between the rigid plate 2 and a river-bed part 9, causes water to gather at the lower part of the rigid plate 2 to reduce bending of the rigid plate 2 and form a slope surface with a slow gradient, resulting in the reduction of the generation of noise.

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 overflowing ice falling noise.

(Prior art and its problems) When a residence, etc. is located near 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 noise, it may become a problem as noise pollution. Fig. 1 shows a conventional undulating weir made of a flexible membrane, in which (1) is a flexible membrane, such as a rubberized cloth envelope (bag-like body), and (4) is a body that communicates with the envelope. Inlet/exhaust (water) pipe, (7) indicates an expansion medium such as air or water, (8) indicates overflow water, and (9) indicates a river bed. It can be contracted and laid down (for example, Special Publication No. 11702-11702, Special Publication No. 40-1170)
4-2371).

(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.

Figures 2 and 3 are views taken along the river flow direction of an undulating weir made of a flexible membrane as an example of the present invention, with Figure 3 showing the weir when it is erected and Figure 4 when it is being lowered. Note that FIG. 4 is an enlarged view of section A, which is circled in FIG. 2, and FIG. 5 is an enlarged view of section B, which is circled in FIG.

In the present invention, a rigid plate (2), for example, steel coated, is inserted in the vicinity of the two-fold part (6) when the flexible membrane envelope (1) collapses. One end of a rubber plate, a corrosion-resistant steel plate, etc. is fixed. When the weir is erected, the other end is extended downstream from this fixed part so that the slope formed by the plate (2) becomes a gentle slope to the river bed. Release without fixing. This plate (2) is provided over the entire length or part of it in the direction across the river flow, and is fixed to the envelope membrane (1) by suitable means such as adhesive. (5) is this fixing means.

Near the top of the rigid plate (2) is an inflow hole (
12). As shown in the figure, it is preferable that the opening area of the upper surface of the hole (12) be larger than that of the lower surface so that water can easily flow through the hole (12). The inflowing water flows out from between the rigid plate (2) and the riverbed (91) released at the downstream end of the rigid plate (2), but water accumulates at the bottom of the rigid plate, and this filled water increases the overflow water pressure. This makes it difficult for the rigid plate (2) to bend.

By doing the above, the noise can be reduced by allowing the overflow water to fall gently.

(Effect of the invention) According to the present invention as described above, there are the following advantages.

By forming a gentle slope on the downstream side of the weir body, overflow water flows down gently, thus reducing noise caused by overflowing ice falling. In addition, since the overflow water flows down a gentle slope, fluctuations in the separation point of the overflow water vein from the weir body and vibrations of the water vein itself are reduced, thereby preventing vibration of the weir body.

[Brief explanation of the drawing]

In the diagrams showing flexible membrane undulating weirs cut in the direction of river flow, FIG. 1 shows the conventional one, and FIG. 2.6 shows the one according to the present invention. Note that Figure 2 shows the weir when it is erected, and Figure 6 shows it when the weir is collapsed. Figure 4 is an enlarged view of section A, circled in Figure 2, and Figure 5 is an enlarged view of section A, circled in Figure 2.
It is an enlarged view of part B circled in the figure. (1) Flexible membrane envelope, (2) Rigid plate, (4) Inlet/exhaust (water) pipe, (5) Fixing means, (6) ...bifold part, (7)...expansion medium,
(8)...overflow water, (9)...river bed, (12)...
... Hole 1 Figure 7I-2 Figure 3

Claims (5)

[Claims] (1) A flexible membrane envelope that forms a weir body is attached to the river bed in a direction that crosses the river flow, and a fluid serving as an inflation medium is introduced into the envelope to inflate and erect it. In a weir designed to discharge fluid as an expansion medium and cause the weir to contract and collapse, the entire length or part of the weir in the direction across the river flow on the downstream side of the weir when the weir is expanded is such that it cannot be folded into the envelope. One end of the rigid plate is connected and fixed in advance, and the other end of the plate that closes when the weir is expanded is extended downstream from the point where the overflow water falls and is released. By preparing holes in advance to allow water to flow in on the lower side, the rigid plate prevents it from bending due to overflow water pressure.The rigid plate allows overflow water to flow downstream of the weir body on a gentle slope. An undulating weir made of a flexible membrane, characterized in that it prevents and reduces noise caused by overflowing water and vibration of the weir body. (2) The flexible membrane undulation according to claim (1), wherein the hole provided in the rigid plate so that water can flow into the lower side of the rigid plate has a larger opening area on the upper surface than the opening area on the lower surface. Weir. (3) The flexible membrane undulation according to claim (1), wherein the position of the cover that connects and fixes one end of the rigid plate is near the two-fold part of the cover when the weir collapses. Weir. (4) An undulating weir made of a flexible membrane according to claim (1), wherein the rigid plate that cannot be folded is a rubber plate containing steel wire. (5) The flexible membrane undulating weir according to claim (1), wherein the plate having such rigidity that it cannot be folded is a steel plate.