JPS5965111A - Raising and falling dam of flexible film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

In a flexible membrane undulating weir, a flexible membrane envelope (bag-like body) made of rubberized cloth, for example, which forms the weir body, is attached to at least the riverbed in the direction across the river, and an inlet/exhaust pipe is connected to the inside of the envelope. (water)
A fluid such as air or water as an expansion medium is introduced through a tube to cause the tube to expand and stand up, and the fluid is discharged from the inside of the envelope to cause the tube to contract and fall down (for example, Japanese Patent Publication No. 11702/1973).
(See Japanese Patent Publication No. 44-2371).

Conventionally, in this type of undulating weir, as shown in Figure 1,
When the upstream water depth (11) reaches the planned lodging water level (5) at the time of flooding (see figure fal), the envelope forming the weir (1 mark 1 fluid is discharged l-) is completely collapsed, and the collapsed envelope membrane is completely collapsed. This prevents floods by allowing flowing water (6) and sediment (stones) (3) to pass through (see Figure (1)), but when the flooding is over, sediment (3) is deposited on the envelope (1) that has collapsed. When the next weir is erected, this accumulated sediment obstructs it and the erecting force of the weir causes the accumulated sediment (b)
The weir cannot be pushed up to the second stream side (see Fig. 1 fdl), and the predetermined weir height cannot be secured.

This type of sediment deposition phenomenon often occurs at weirs in the middle and lower reaches of rivers, and is often seen when weirs are installed at planned riverbed positions (levels) that are lower than the current riverbed. Note that (4) in Figure 1 is the river bed, and the imaginary line in Cdl in the figure shows the upright state of the envelope in the case where there is no sedimentation.

As a result, water for agricultural purposes cannot be taken 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 has been 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 similar auxiliary weir (hereinafter abbreviated as a small weir) is formed at the upstream side inside the envelope (1) forming the main weir, which is lower than the take-up height formed by the envelope (1). Cover (2)
is arranged.

The present invention constructed as described above operates as follows.

■ Under normal usage conditions, as shown in Figure 2+a+,
The main weir is erected by the cover (1) and the auxiliary cover (2)
Small weirs due to this will be brought down. Water intake is used in this state.

■ A flood occurred and the upstream water depth (11) reached the planned overflow water level (5
), as shown in Figure 2 (bl), the main weir forming the envelope (1) is collapsed as in the conventional method.The flowing earth and sand (3) flows down the collapsed envelope coating of the side weir. When the flooding begins to stop, the water flow rate slows down and sediment begins to accumulate on the collapsed both envelopes, and when the flooding ends, it is deposited.

■ The next time the flood stops and the weir is erected, first refer to Figure 2 (
A small weir like C1 is erected with high internal pressure, and the envelope (2) of the weir, which mainly pushes the accumulated earth and sand in that area, is pulled upstream. (Internal pressure of the envelope (2) of the small weir)> (Internal pressure when the envelope (1) of the main weir is in use).

■ Only one small weir (2) is shown in the above ■ to ■, but depending on the amount of sediment (3), multiple small weirs (2), (2') may be formed as shown in Figure 2 Fdl. , (2") are installed under high pressure. At this time, the lower weir height has higher internal pressure.

■ In the states of ■ and ■, the envelope (1) of the main weir is inflated and erected to maintain a predetermined weir height. FIG. 2 [el shows this state. Tasoshi small weir is for multiple cases.

■ After ■, as shown in Figure 2 ffl, the envelopes (2), (2'), and (2") of the small weir inside the main weir are shrunk and used. The sediment upstream of the weir will be removed next time. During floods, the side weirs collapse and the water flows downstream due to the special hydraulic power.

In addition, in the states of ■ and ■, that is, the states of FIG.

In addition, as mentioned above, in Figure 2 (C) and (dl), the small weir was inflated after the flood ended (in the presence of accumulated sediment), but as shown in Figure 6, the small weir was covered before the flood stopped. (2) can be expanded to ensure a predetermined weir height without depositing earth and sand (6) on the envelope (1) membrane of the main weir.

In other words, the flow of sediment (3) flows down on the envelope membranes of both collapsed weirs as explained in section ① above, but when the water starts to flow or stop flowing, the flow rate slows down and the collapsed envelopes (1) and (2) are formed. As earth and sand begin to accumulate on both weir envelopes, as shown in Figure 6, the small weir formed by envelope (2) is erected, and the earth and sand is deposited upstream of the small weir and the collapsed envelope (1) is erected. Do not deposit on film. Even if a large amount of sediment passes through the small weir formed by cover (2) and accumulates on the fallen cover (1), overflow water from the upright small weir formed by cover (2) The falling water flow washes away the earth and sand on the fallen envelope (1) membrane downstream. After the flooding has stopped, the main weir formed by the envelope (1) is erected and water is taken in from upstream of the main weir.

In addition, after the main weir formed by the envelope (1) is completely erected, the envelope (
The small weir formed in 2) will be laid down. The accumulated sediment upstream of the weir can be flowed downstream by the outflow force when the side weirs formed by envelopes (1) and (2) collapse during the next flood. Furthermore, the internal pressure that causes the envelope (2) to expand and stand up is higher than the internal pressure that is applied to the envelope (1) in use.

As described below, according to the undulating weir made of a flexible membrane of the present invention, there is no need to manually remove accumulated earth and sand, and the weir can be erected only by the internal pressure of the weir.

[Brief explanation of the drawing]

Figure 1 (al~(dl) is a diagram explaining the lodging and raising process of a conventional undulating weir made of a flexible membrane, and Figure 2 is (al~([) is an illustration of the i-I undulating weir made of a flexible membrane of the present invention. Figure 6 is a diagram illustrating the operation process of another example of the =f exflexural membrane undulating weir of the present invention. (1) Encasing; (2)... Cover, (3)... Sediment (stone), (4)... River bed, (5)... Planned lodging water level, (6)... Flowing water agent, patent attorney Yoshi. Takemasa
Tsukasa 1st (0) 5 (b) 1st (C) (d) 2121st (0) (b) 2nd (C) (d) 21st Swamp (e) (f)

Claims (1)

[Scope of Claims] (1) A flexible membrane envelope is attached to at least a river bed in a direction across the river, and a fluid as an expansion medium such as air or water is introduced into the interior of the envelope to inflate and erect. In a flexible membrane undulating weir that is capable of deflating and collapsing by discharging a fluid as an expansion medium from inside the envelope, the undulating weir is made of a flexible membrane as a main body, and the flexible membrane as a main body is used. It consists of an auxiliary flexible membrane undulation weir with a lower weir height than the main flexible membrane undulation weir installed at the upstream part of the interior of the undulating weir, and when water comes out, the auxiliary undulation weir is used to expand and raise it. An undulating weir made of a flexible membrane, characterized in that the main weir is inflated and erected to ensure the weir height after the end of flooding without manual removal of accumulated sediment. (2) The scope of the patent claims that eliminates the manual removal of accumulated sediment by removing the accumulated sediment on the envelope of the main weir which collapses by inflating and erecting the auxiliary weir using high internal pressure after the flooding has subsided. The undulating weir made of a flexible membrane according to item (1). (6) The end of the flood at the time of the flood f? Claim (1) states that the manual removal of accumulated sediment is eliminated by increasing the auxiliary weir at iJ to expand and raise it under high internal pressure to reduce the amount of sediment that accumulates on the envelope of the main weir that collapses. An undulating weir made of flexible membrane.