JPS6164912A - Controller for water bag type dam - Google Patents

Abstract

PURPOSE:To exactly and automatically fall down a water bag type dam during flood period by a method in which an air vent is provided in the upside of the horizontal part provided to the middle of the downstream side of a siphon device and connected to a sucker through a suction pipe. CONSTITUTION:When the water level of upstream river overflowing a dam 1 reaches a given height, overflow occurs from the crest 9b of a suction siphon 9. The outlet 9e is filled with water, and the inside of the siphon 9 becomes of a negative pressure to shield it from the outside. At the same time, the negative pressure is transmitted through a suction pipe 7, an air-water separating tank 6, and an air vent 5d to the inside of the siphon 5. The water level on the upstream side in the siphon 5 is sucked up, overflow in the siphon 5 is started, and air is discharged with overflow water. Theoverflow water on the downstream side of the siphon 5 is separated from air in the horizontal part 5b, and the air is floated in the tank 6 and discharged from the siphon 9. The siphon 5 is almost deprived of its air, and water is discharged from the dam 1 to fall it down.

Description

Detailed Description of the Invention (Field of Application of Ii) The present invention is a weir that is used for water intake from a river, etc., and which is erected by pouring water into a flexible bag. The present invention relates to a control device for controlling the system.

(Prior art) The water type bag weir control device 04 has a complicated structure, but
Alternatively, those with a simple structure may be performed manually. As an improvement over the conventional one, Patent Application No. 05 of 1982
There is a problem with the patent of No. 3,281, but when examined in detail, this application shows that the siphon and the intake pipe are directly connected, so the separation efficiency of air and water in the smartphone is 7. Therefore, it may take a long time to start the siphon, or air may remain in the siphon until the end, which may interfere with the lodging of the weir body.In addition, there is always overflow in the intake siphon, so air replenishment is required. There is a problem with this.

(Problem to be solved by the invention 1) This defense was made in order to correct the problem described in J-.Inside the siphon, air and water that form H...'! The object of the present invention is to provide a control device for a wooden bag-shaped weir that improves the separation and has a simplified structure for controlling σO.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a drainage channel that communicates the inside of the weir body and the downstream river, and a siphon means is interposed in the middle of the drainage channel, and a siphon means is interposed in the middle of the drainage channel. In a control device for discharging water in a weir body and causing the air to fall down, a horizontal portion is provided at an intermediate portion on the downstream side of the siphon means, an air vent is provided on the upper surface of the horizontal portion, and the air vent is connected to an intake pipe. It is characterized by being connected to the intake means via.

With this configuration, when the water level of the upstream river reaches a predetermined water level or higher, a siphon can be formed in the siphon means by effectively exhausting the air inside the siphon means by opening the seven air vents with the air intake means. .

(¥ Flow side) Hereinafter, an embodiment of the invention will be explained with reference to the drawings [1]. The river is crossed by a weir that crosses Kanayama.
It is divided into A and lower KB.

The weir body 1 is made of a flexible hollow bag, and the inside thereof is connected to a water supply system R3 via a water pipe 2. A drain pipe 4 branches off from the middle of the water pipe 2, that is, is connected to a siphon 5, and continues to a drain port 4a that opens downstream. Siphon 5 is the reason why weir body l stands up.
The rising part has a crease 5a at a position higher than the water surface that occurs under atmospheric pressure due to the maximum internal pressure (hereinafter referred to as the maximum internal pressure of the weir), the descending part that reverses and descends from the crest 5a, 1. A horizontal portion 5C provided in the middle of the lower part of the weir, which is level at a position sufficiently higher than the highest downstream river water level when the weir is collapsed, and a river W of the downstream river that is continuous from the descending part. It consists of an opening 5C that opens at a nearby position.

The opening 5C communicates with the drain port 4a at this position.

An air vent consisting of a plurality of grooves or holes 5d is provided on the upper surface of the horizontal portion 5b, and a steam/moisture tank 6 is provided above and on the sides thereof. An intake pipe 7 that opens at the top of the intake siphon 9 is connected to the neck of the steam/water separation tank 6 .

The inlet 8a of the intake siphon 9 is significantly narrower than other parts of the intake siphon, and the crest 9 at the top
b is the same as the height of the water level of the upstream river when the weir body should be collapsed, and the soil surface 9c of the outlet 9e is slightly higher than the expected highest water level of the upstream river when the weir body is to collapse. The discharge port 8e of No. 9 is provided at a position higher than the position of the upper surface 9c and opens toward the L direction.
An outflow port 9d at the same water level as the upper surface 9c is provided on a surface opposite to the surface 9C that rises toward the discharge port 8e.

Further, a backflow prevention plate 10 is provided at the upstream portion of the side waterway 8 across its entire width, and its frest is positioned higher than the outlet 8e of the intake siphon 9. In addition, 12 in the figure
is the straight tube 1 that connects the inlet and outlet 1 of the siphon 5.
This is an emergency valve that is designed to keep 1 closed at all times.

Next, the operation of this embodiment will be explained.

When river water is forced into the weir body l by the water supply device 3,
Weir body l stands up. In the upright state, the vicinity of the crest of the siphon 5 is always open to the atmosphere, and the rising portion of the siphon 5 is appropriately filled with water, so that the weir maintains a stable upright state.

1. When the water level for the flowing river reaches a predetermined height, the water first overflows from the frest 8b of the intake siphon 9, and the intake siphon 9 and the outlet 9e become full of water. 9 The interior is isolated from the outside air. On the other hand, air is naturally mixed in the overflow water, and this air entrainment action creates a negative pressure inside the intake siphon 9, and this negative pressure sucks up the water surface on the upstream side of the intake siphon 9, causing the overflow to continue. It becomes more and more intense. At the same time, this negative pressure is applied to the intake pipe 7,
Air moisture! +(!6 and the air vent L15d are transmitted into the siphon 5, the upstream side of the siphon 5, and the gas are sucked up, and overflow starts in the siphon 7 on 5. When 2, the siphon:' -The water level on the downstream side within t15 also rises,
Since the 1] γ setting of air vent + r5d is set sufficiently high, the flow force of the overflow water becomes sufficiently strong before the air vent port 5d is submerged, and the air inside the siphon 5 absorbs the overflow water. and υ[is given to the second generation. The overflow water that has flowed downstream of the siphon 5 is mixed with air in the horizontal part 5b,
The separated air, together with the air remaining in this part, passes through the air vent 5d, the air-water separation tank 6, and the intake pipe 7, and is mixed with the water flow in the section II) near the top of the intake siphon 9. and released into the atmosphere.

In this way, when the amount of air in the device made up of outside air decreases, the water surface on the hilly part on the downstream side of the siphon 5 rises and overflows, reaching the vicinity of the horizontal part 5b. Even at this stage, the bubbles carried to the horizontal part 4b and d float up in the water in the air-water separation tank 6 and are discharged from the intake siphon 9, so there is almost no air in the siphon 5. No one remains, a so-called siphon is formed, the books inside the weir are ejected, and the weir collapses.

Next, the functions of the e-flow prevention IL handling 10 will be explained.

As the lodging progresses, most of the water in the side channel 8 flows back into the upstream river, but the water below the crest of the backflow prevention plate io ii! ! The water remains in the side channel 8 without flowing away, and the water in the side channel below the outlet 3e of the intake siphon is only slightly removed by the outlet 9d, so the rate of decrease in the water level is extremely slow. It is. therefore.

The reason why the upper surface 9c of the intake siphon 9 near the outlet 9e is exposed and the siphon inside the siphon 5 is severed due to the intrusion of air from this part is after the weir body starts to collapse.
Since sufficient time has elapsed, the weir body can completely complete its lodging.

Furthermore, since the size of the outflow port 9d is appropriately determined, the siphon is cut off before the next standing up, and the standing preparation is automatically completed.

Emergency valve 1 is required to collapse the weir body at any time during non-flood times.
2 can be opened artificially.

(Effects) As described above, in the present invention, a horizontal portion is provided on the downstream side of the air intake means, an air vent is provided on the upper surface of the horizontal portion, and air is drawn through the air vent by the suction means. Since it is provided so as to be pulled out from the inside, the overall structure is not complicated, and the siphon can be formed reliably, so that automatic lodging can be reliably performed in the event of a flood.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing the weir body and the siphon means on the same plane to illustrate the principle of the present invention, and FIG. 2 is a plan view. l - weir body, 5 - siphon. 5b~Horizontal part, 5tj~Air vent. 9 ~ Intake siphon. Patent 1,1 applicant Toyota Motor Corporation (and 1 other person)

Claims (2)

[Claims] (1) Control in which a drainage channel is provided that communicates the inside of the weir body with the downstream river, and a siphon means is interposed in the middle of the channel, and the water inside the weir body is discharged and collapsed by discharging the air in the siphon means. The device is characterized in that a horizontal part is provided at an intermediate portion on the downstream side of the siphon means, an air vent is provided on the upper surface of the horizontal part, and the air vent is connected to the air intake means via an intake pipe. Control device for bag type weir. (2) The control device according to claim 1, wherein the intake means is an intake siphon, and the other end of the intake pipe is connected to the top of another siphon means. Control device for a bag weir.