JPS6012487B2 - Flexible membrane water stop weir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable membrane water stop weir (air expansion type), and more particularly to a movable membrane water cutoff weir that can be lowered in multiple stages.

In recent years, cut-off weirs made of flexible membranes have been used for irrigation, etc., but these weirs are made of flexible membranes, such as rubberized cloth, that are covered with at least several beds of water stop weirs. Install in the transverse direction~
Air is sent into the inside of the envelope from an inlet/exhaust pipe that extends to the bottom of the envelope to cause expansion.

(For example, Tokuko Sho 40-11702 “Samurai Ko Sho 44-1237”
(see 1). When a river floods with this type of cut-off weir, it is necessary to collapse the cut-off weir quickly and allow the water to flow downstream. However, with conventional cut-off weirs, they would collapse completely.

In the case of a shower-like rainfall, if the weir stops collapsing midway and stops, the stored water on the upstream side does not have to flow downstream.

The present invention eliminates the above-mentioned conventional drawbacks and satisfies the above-mentioned needs.

That is, the present invention is a multi-stage lodging type water stop weir in which the sheath once collapses (due to the previously acting lodging water level), but does not completely collapse until it reaches the lodging water level again (later acting lodging water level). The invention will now be explained in detail with reference to the illustrative drawings.

Figure 1 Nakagawa: This is a bag-like body made of a material similar to that of the Nakagawa River.This bag crosses the river and is attached to the concrete river bed. The case where there is no air in the envelope is indicated by 8'', the case where the case is completely collapsed is indicated by 8'', and the case where the case is in an intermediate state is indicated by ''.

Open the valve 5 and operate the blower 4, and the pipeline 6,
Air is blown through 7 to the envelope in the 8'' state.

Send the full amount of air into the bag and the corner will be at its maximum height. ) Close valve 5 and stop blower 4. With the above, the water stop weir is in its normal operating condition. As will be described later, the upstream water level is designed to have a water level difference of 5 degrees between 25 working earlier and 27 working later.

If the upstream water level temporarily reaches the water level 2 due to a shower, etc., the upstream water level can be detected by transmitting the water level from the upstream water level detection port through the pipeline 9 to the detection device IQ, for example, the siphon pipe (for example, the height of the siphon pipe is 25') (Let it be equivalent to 25).

In this case, the bucket 26 receives the water flowing out from the siphon pipe and is lowered by gravity, thereby opening the valve turtle 3. When the blower mother blows air into the envelope and raises the weir, the blown air is cooled by water on the upstream side and drain accumulates inside the envelope. Even if this drain closes the pipeline Takataka, the air inside the envelope will not be discharged even if the valve turtle 3 is opened, so a drain tank envelope 5 is provided in the middle of the pipeline turtle 2. Therefore, the water in the pipeline tank 2 collects under the drain tank turtle 6, and the air in the pipeline turtle lid passes through the pipe member 7 and reaches the tip of the pipe 2 crab in the blow-off tank Fujifin. Note that military 6 is a valve for draining water from the drain tank.
Flow-off tank 1 is filled with water, and its water level is 9, and the difference between the end of pipe 2P and the bell bone g is C.
is waiting for a kind of valve effect.

The above C is the design pressure when the upstream water level is 25 mm and the envelope is 25 mm.In other words, the air inside the pipe 28 escapes from the tip of the pipe 20 at an air pressure higher than the level difference.At this time, the air As air bubbles escape, the amount of water in the blow-off tank temporarily increases, but the upper area is enlarged and two anti-foam plates, for example, a plate with holes, are installed so that only air escapes and the water inside the blow-off tank increases. Water cannot escape.

If this state of air leakage continues, the water stop weir envelope changes from a turtle's shape to a turtle's shape, and the cross-sectional area of the river increases as its height decreases, allowing water to drain upstream.

At the height of the pipe, the air pressure inside the envelope is balanced by the water pressure difference C between the tip of the pipe 28, which has the valve effect of a flow-off tank 1, and the water level turtle 9.The air inside the envelope cannot escape from the 2-box pipe. .In other words, the water stopping pipe stops midway.The above are the means and operation for inclining (contracting) the casing in the middle.As the water level increases further, the air pressure inside the casing increases and the pipe 2
Air escapes from the Q tip, but if the water rises quickly, the upstream water level will reach water level 27.

Then, the water level 27 of the detection device is transmitted and detected (same as the detection device Tominori), and the valve turtle 4 is not connected to the lodging device 2 star (same as the lodging device 26) to the line of the valve force 3. The air inside the valve unit 4, which enters the atmosphere, completely escapes and the envelope becomes r-shaped. In other words, it collapses completely. The above is the means for completely collapsing (contracting) the envelope and its operation. In order to completely collapse in the above case, it is necessary to quickly drain the water on the upstream side to lower the water level when the complete collapse water level reaches the two holes. Valve 1 through 11
4 to open the valve 14 and quickly remove the fluid inside the weir. Also, for intermediate lodging, use valve 13 (
Use a valve that opens when the water level reaches the point where intermediate lodging begins.

The purpose of this is that the head C of the safety device (normal pressure) of the blow-off tank 18 is low compared to the head D of the safety device (design maximum pressure) of the blow-off tank 23, and if the pressure in the weir body is even slightly high when ocean air is applied, the weir If there is no valve turtle 3 before the air is applied to the body, the fluid will escape from the blow-off tank turtle 8. In order to prevent this, a valve 13 is provided for the purpose of preventing malfunction during air injection. It is not until the upstream water level reaches the intermediate collapse water level that the valve 13 is opened and the blow-off tank furnace 8 is activated due to the pressure change caused by the increase in the upstream water level. On the other hand, as a complete device, a pipeline 22 branched from the air injection pipeline 6 is placed in a blow-off tank 23 with a pipe 24 whose tip is a barrier formed by an extension of the pipe 22. Water is stored in the flow-off tank 23, and the distance from the tip of the pipe 24 to the water surface is D. If too much air is put into the envelope at a design pressure D or higher during inflation, the air being injected will escape from the tip of the pipe 24, and a complete device is provided to prevent accidents due to overpressure of the envelope. The above D is the design pressure when the upstream water level is 27 and the envelope is tortoise. According to the present invention as described above, it is a multi-stage type in which the sheath that forms a water stop weir once collapses, and even if it collapses, it will not completely collapse unless it falls over again, so that the sheath will not collapse due to a temporary increase in water. Since it does not completely collapse, it has the advantage of being economical without wasting stored water.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the movable membrane water stop weir of the present invention. turtle··. Coverage at maximum height, i′...! and 1'', 1''...cover in a completely collapsed state, 2...river bed concrete, 4... Blower, 5...Valve, 6,?
...Pipeline, 8...Upstream water level detection port 9...Pipeline, Ki Q, Kame 1...Detection device, Kame 2...Pipeline, 13, Stove 4...Valve, Kame 5...Drain tank is also heavy 6 ... Valve " Thing 7 ... / Type " Turtle 8 ... Flow-off tank, 19 ... Water level of flow-off tank, 20 ... Pipe, 21 ... Foaming board, 22 ... Pipeline, 23 ... Blow-off tank, 24 ...・Pipe " 25... Lodging water level that works first, 26... Lodging device, 27... Lodging water level that works later, 28... Lodging device. Figure 1

Claims (1)

[Scope of Claims] 1. A water stop weir in which a flexible membrane envelope is attached to at least a river bed in a direction across the river, and gas can be sent to the envelope to make it erect (inflate). and comprises two or more lodging means that detect only the upstream water level, operate at different water levels, and lodge (contract) the envelope to different set heights, and the two or more lodging means are one One is completely lodging (
The other is a means for intermediate collapse (contraction), and the means for completely collapsing is a means for completely collapsing the exhaust pipe that communicates with the bottom of the envelope, which is equipped with a valve that is opened and closed by detecting the water level upstream of the cover, and the tip is The intermediate collapse means is provided with a valve that is opened and closed by detecting the water level upstream of the intermediate collapse in the exhaust pipe communicating with the bottom of the envelope, and the tip is opened in a blow-off tank filled with water. A flexible membrane water stop weir characterized in that these means operate independently of each other. 2. The flexible membrane water stop weir according to claim 1, wherein the blow-off tank is provided with a defoaming plate having a cross-sectional area larger in the upper part than in the lower part and having holes in the tank. 3. In a cut-off weir in which a flexible membrane envelope is attached to at least the river bed in a direction across the river, and gas is sent to the envelope to make it erect (inflate), only the upstream water level The two or more lodging means operate at different water levels and collapse (contract) the envelope to different set heights, and one of the two or more lodging means operates at different water levels, and one of the two or more lodging means operates at different water levels and collapses (contracts) the envelope to different set heights.
The other is a means for intermediate collapse (contraction), and the means for completely collapsing is a means for completely collapsing the exhaust pipe that communicates with the bottom of the envelope, which is equipped with a valve that is opened and closed by detecting the water level upstream of the cover, and the tip is The intermediate collapse means is provided with a valve that is opened and closed by detecting the water level upstream of the intermediate collapse in the exhaust pipe communicating with the bottom of the envelope, and the tip is opened in a blow-off tank filled with water. Furthermore, a drain tank is provided between the valve of the intermediate collapse means and the blow-off tank, and the complete collapse means and the intermediate collapse means operate independently of each other. Water weir. 4. The flexible membrane water stop weir according to claim 3, wherein the blow-off tank is provided with a defoaming plate having a cross-sectional area larger in the upper part than in the lower part and having holes in the tank.