JPS629683B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an undulating weir made of a flexible membrane, and more particularly to a water-expandable undulating weir made of a flexible membrane.

(Prior art and its problems) An undulating weir made of a flexible membrane uses a flexible membrane envelope (bag-like body) such as rubber-coated cloth that forms the weir body in a direction that crosses the flow of a river, etc. at least on the floor. A pressure medium such as air, water, or both of these is injected into the interior of the envelope to expand and erect the envelope, and the pressure medium is discharged from the interior of the envelope to cause the envelope to contract and fall down (e.g. (See Special Publication No. 11702, Special Publication No. 44-2371).

In a flexible membrane undulating weir installed at the convex apex of the middle concrete of this type of undulating weir (for example, a flexible membrane undulating weir installed on the crest of a concrete high dam for raising purposes) In the case of the air expansion type when the weir is collapsed, the internal air can be completely discharged to the outside of the weir body, but in the case of the water expansion type, the water accumulated near the downstream bifurcated end is not discharged to the outside of the weir body.

That is, as shown in FIG. 1, in the collapsed state, the vicinity of the folded end 6 is at a position lower than the level of the water supply/drainage port 5, and therefore no water is drained. Therefore, the water-inflatable flexible membrane undulation weir installed on the crest 3 cannot be completely collapsed. In FIG. 1, the collapsed shape of the envelope 1 is represented by a solid line, and the expanded shape is represented by a virtual line. Also, 2 is the water supply and drainage pipe,
4 is water.

(Structure of the Invention) In view of the above, the present invention has been developed to solve these problems.

That is, the present invention provides an undulating weir made of a water-expandable flexible membrane attached to the apex of a convex shape of concrete. The structure is characterized by having a flexible tube that opens near the bifurcated ends of the weir body. The present invention will be described in detail below with reference to FIG. 2 as an example.

A thin pipe 7 is passed from the normal water supply and drainage port 5 to the water supply and drainage pipe 2, and this thin pipe 7 is made of a flexible material inside the weir formed by the envelope 1, and is folded into two along the expansion shape of the weir. It rises to near end 6 and is left open at that position. This thin pipe 7 may be connected to a water supply and drainage pipe through a separate pipe without using a normal water supply and drainage port. Also, if the water supply and drainage pipes and drain pipes are separate, connect them to the drain pipe.

In addition, in FIG. 2, contrary to FIG. 1, the inflated shape of the envelope 1 is drawn by a solid line, and the collapsed shape is drawn by a virtual line.

If this drainage pipe 7 is provided, even if the level of water accumulated near the bifurcated end 6 becomes lower than the level of the water supply/drainage port 5 during the collapse process of the weir body, all of it will be drained out of the weir body due to the siphon phenomenon. be able to.

(Effects of the Invention) As described above, according to the present invention, a water-expandable flexible membrane undulation weir installed at the apex of a convex shape of concrete can be completely collapsed.

[Brief explanation of the drawing]

In the diagram explaining the water-expandable flexible membrane undulation weir installed at the convex apex of concrete, the first
The figure shows a conventional device, and FIG. 2 shows an example of the present invention. 1... Covering, 2... Water supply and drainage pipe, 3... Crest, 4... Water, 5... Water supply and drainage pipe opening, 6... Bifold end of covering, 7... Thin pipe.

Claims (1)

[Claims] 1. In a water-expandable flexible membrane undulating weir attached to the convex apex of concrete, from the water supply and drainage pipe, or if the water supply and drainage pipes are separate, from the drainage pipe into the weir formed by the envelope. What is claimed is: 1. A water-expandable flexible membrane undulating weir, characterized by having a tube that is flexible inside the weir body and opens near two bent ends of the weir body.