JPS6023514A - Water-inflatable flexible membrane undulating weir - Google Patents

Abstract

PURPOSE:To discharge water trapped on the folded end portion of a water-expansion type rising and falling dam made of a flexible film to the outside of the dam by providing a small pipe having an opening near the folded end portion of the inside of the dam, connecting from a water supply and discharge pipe to the inside of the dam. CONSTITUTION:A flexible small pipe 7 is provided in such a way that it is opened near the folded end portion 6 of the expanded skin in the water expansion type film baggy skin 1 attached to the top of the convexed crest 3 of concrete. The pipe 7 is connected from a water supply and discharge pipe 2 to a water supply and discharge port 5. Even when the level of water 4 trapped near the folded end 6 becomes lower than the level of the port 5, the water can be all discharged to the outside of the dam by a siphoning phenomenon.

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. The pressure medium of air, water, or both of these is supplied to the interior of the envelope to inflate 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. (For example, see Japanese Patent Publication No. 40-11702 and Japanese Patent Publication No. 44-2371).

In this type of undulating weir, a flexible membrane undulating weir is installed at the convex apex of the concrete (for example, a flexible membrane undulating weir is 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 two downstream ends is not discharged to the outside of the weir body.

In other words, as shown in Fig. 1, the two girder ends (6)
Drainage does not occur in the vicinity because it is at a lower level than the water supply and drainage port (5). Therefore, the water-inflatable flexible membrane undulation weir installed on the frest (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. Rumata (2) is a water supply and drainage pipe, and (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 a water-expandable flexible membrane undulating weir that is attached to the convex apex of concrete, from a water supply and drainage pipe,
Alternatively, if the water supply pipe and the drain pipe are separate, the drain pipe leads into the weir body, and is characterized by having a pipe that is flexible inside the weir body and opens near the two proximal ends of the weir body. It is.

The present invention will be described in detail below with reference to FIG. 2 as an example.

A thin pipe (7) connects the normal water supply and drainage outlet (5) to the water supply and drainage pipe (2).
) is passed through this thin tube (the force is made of a flexible material within the weir body formed by the envelope (1), and rises along the expansion shape of the weir body to near the two proximal ends (6). Leave it open in the open position.This open pipe (no) may be connected to the water supply and drainage pipe with a separate pipe without using the normal water supply and drainage port.Also, if the water supply pipe and the drainage pipe are separate, the drain pipe Connect to.

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 a force is provided in this drainage pipe, even if the level of water accumulated near the two proximal ends (6) becomes lower than the level of the water supply and drainage port (5) during the collapse process of the weir body, the siphon phenomenon will cause the water to drain away. It can be discharged outside the weir body.

(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 drawings]

In the diagrams illustrating a water-expandable flexible membrane undulating weir installed at the convex apex of concrete, FIG. 1 shows a conventional one, and FIG. 2 shows an example of the present invention.

Claims (1)

[Claims] (1) In a water-expandable undulating weir made of a flexible membrane that is attached to the convex apex of concrete, the weir that forms an envelope can be used from the water supply and drainage pipe, or from the drainage pipe if the water supply and drainage pipes are separate. It leads into the body, has flexibility inside the weir body, and has two parts in the weir body.
A water-expandable flexible membrane undulating weir characterized by having a pipe that opens near the folded end.