JPS5965110A - Rising and falling dam of flexible film - Google Patents

Abstract

PURPOSE:To prevent the sedimentation of soil and sand on the film of fallen dam body by providing a small-size flexible film rising and falling dam having a height lower than the main dam on the right upstream position of the main flexible film rising and falling dam. CONSTITUTION:When water flooding occurs and the water depth H of the upstream reaches a designed falling water lever 5, the main dam of a baggy film 1 is fallen. During the maximum water flooding, the main dam of the baggy film 1 and a small-size dam of a baggy film 2 are fallen together. When the water flooding comes to an end, since the flow rate of water becomes delayed and soil and sand bagin to sediment on the baggy films 1 and 2 of both dams. The small- size dam of the baggy film 2 is raised to prevent the sedimentation of soil and sand on the baggy film 1 of the main dam.

Description

[Detailed description of the invention] The present invention relates to a flexible membrane undulating weir.

An undulating weir made of a flexible membrane is a weir made of a flexible membrane, such as a rubberized cloth envelope (bag-shaped I*'), which forms the weir body, is extended in the direction across the river at least in the river bed, and is connected to the inside of the envelope. Leading injection and exhaust (
Water) A fluid as an expansion medium such as air or water is introduced from a pipe to cause expansion and erecting, and the fluid is discharged from the inside of the envelope to cause contraction and collapse.
702, Japanese Patent Publication No. 44-2371).

Conventionally, in this type of undulating weir, as shown in Figure 1, when water comes out, the weir is formed when the second water depth (1-1) reaches the flattened water level (5) (see Figure [al]). The fluid inside the envelope (1) is drained to completely collapse the envelope, and running water (6) and earth and sand (stones) (6) are passed over this collapsed envelope to prevent flooding (see figure (bl) ), sediment (6) is deposited on the fallen envelope membrane when the flood has ended, and obstructs the erection of the next weir (see Figure (C1)).Such sediment deposition phenomena often occur at weirs in the middle and lower reaches of rivers, and This is often seen when a weir is installed at a planned river bed position (level) that is lower than the current river bed.(4) in Figure 1 is the river bed.

As a result, the weir cannot maintain the designed weir height, making it impossible to take water for agricultural use from upstream of the weir. Currently, weirs are erected by manually removing this accumulated sediment, but this method has the disadvantage of requiring a great deal of labor and time.

In view of the above, the present invention was developed to eliminate these drawbacks. The invention will now be explained in detail with reference to FIG. 2 as an example.

That is, in the present invention, a flexible membrane envelope (an auxiliary weir consisting of a similar envelope (2) with a lower weir height than the main weir formed by the moon, located immediately upstream of the main weir formed by the moon) is provided. (hereinafter abbreviated as small weir)
.

The present invention constructed as described above operates as follows.

(2) In normal use, as shown in Figure 2 Cal, the main weir with the cover (1) is erected, and the small weir with the auxiliary cover (2) is lowered down. Water intake is used in this state.

■ A flood occurred and the upstream water depth (H) reached the planned collapse water level (5)
As shown in Figure 2 (bl), as in the conventional case, the envelope (1
) to topple the main weir formed by the

■ At the peak of the flood, both the main weir formed by envelope (1) and the small weir formed by envelope (2) collapse as shown in Figure 2 (bl), and the sediment μ → flow is caused by both of these collapses. Flows down on the earth's envelope.

■ When the flooding begins to end, the velocity of the flowing water slows down and sediment begins to accumulate on the overlying cover (formed by the Moon and (2)). A small weir formed by the cover (2) is erected, and earth and sand are deposited upstream of the small weir, but are not deposited on the fallen cover (1).

■ Even if a large amount of soil passes through the small take-up formed by envelope (2) and accumulates on the fallen envelope (1), the
As shown in Fig. 1, the falling water flow of overflow from the upright small weir formed by the envelope (2) washes away the sediment on the collapsed envelope (lunar membrane) downstream.

■ After the flooding has stopped, the main weir formed by the envelope (1) is erected and water is taken from the upstream side of the main weir.

(2) After the main weir formed by the envelope (1) is completely erected, the small weir formed by the envelope (2) is brought down as shown in Figure 2 (tel). The accumulated soil upstream of this small weir can be flowed downstream by the water output force when the side weirs formed by envelopes (1) and (2) collapse during the next flood.

As described above, since the flexible membrane undulating weir of the present invention has a small weir with a lower weir height than the main weir placed immediately upstream of the main weir, the main weir that has collapsed due to this small weir It is possible to prevent sediment from accumulating on the envelope of the weir, and even if the sediment accumulates, the overflowing water from the small weir can cause the accumulated sediment on the envelope that forms the collapsed main weir to flow down. That is, according to the present invention, it is possible to reduce the accumulation of earth and sand, and even if it does accumulate, there is no need to manually remove it, and it can be erected by the internal pressure of the envelope.

[Brief explanation of the drawing]

Figures 1 (al to (C1) are diagrams explaining the lodging process of a conventional undulating weir made of a flexible membrane, and Figures 2 (a) to (el) are diagrams illustrating the operating process of the undulating weir made of a flexible membrane of the present invention. Examples of diagrams to explain each are shown. )... Planned lodging water level, (6)... Flowing water agent Patent attorney Masaru Yoshitake
Tsukasa Figure 1 (0) Figure 2 (0) (C)

Claims (2)

[Claims] (1) Attach a flexible membrane envelope to at least the river bed in the direction across the river, and inflate the interior of the envelope by introducing a fluid as an expansion medium such as air or water into the interior of the envelope. In a flexible membrane undulating weir that is capable of discharging fluid as an expansion medium and causing contraction and lodging, there are 1. A flexible membrane undulating weir comprising a auxiliary flexible membrane undulating weir having a lower weir height than the main flexible membrane undulating weir provided in the main body. (2) The auxiliary flexible membrane undulating weir is inflated and erected before the flood water stops, which reduces the accumulation of earth and sand on the envelope membrane of the main flexible membrane undulating weir and improves the main body's efficiency. An undulating weir made of a flexible membrane according to claim 1, which drains earth and sand accumulated on the envelope of the undulating weir made of a flexible membrane.