JPS60246912A - Control device for bagform falling weir - Google Patents

Abstract

PURPOSE:To enable a weir body to fall down irrespective of the water level of the downstream, by a method wherein a control chamber, communicated with the upper stream side of a bagform falling weir, is located, and the interior of the weir body is communicated with the open air through an exhaust pipe depending on a water level in the control chamber. CONSTITUTION:With a feed air source A operated, a weir body 1 is expanded, water on the upper stream side flows through a water-conveyance port 5a into a control chamber B. When an upper stream water level is raised to a given water level, overflow over the crest of a siphon tube 150 begins, and water is discharged to the down stream. When water is increased to a given weir rise water level due to rainfall and the like, water flows in a feed water tank 130 from the conveyance pipe 134 side of a partition wall 131 communicated with the control chamber B. A control tank 120, which heretofore feeds the air in the siphon pipe 150, is full of water. Through a siphon action, water in an exhaust tank 110 is sucked, the interior of the weir body 1 is communicated with the open air through an exhaust pipe 111, and the weir body 1 is rapidly fallen down.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an operating device for a bag-shaped undulating weir.

(Prior art) A bag-like undulating weir that undulates by supplying and discharging air to a bag-like weir made of a flexible material such as rubber-coated cloth installed across a river is simple in structure and operation. Also, because it does not require painting, it has recently been widely used as a water gate in place of iron doors.

Regarding the operating device of this bag-shaped undulating weir, conventionally, (
Since the water level is detected inside the embankment, it is necessary to install a water conduit pipe across the embankment in addition to the intake gutter pipe.

(21) Since the extra 5 minutes of embankment crossing work is installed in close proximity to the water gutter pipe, there is a risk that the embankment will collapse. Management is complicated, and (4) 4>, 1': Since the water level is detected by a mechanical method, there is a risk of failure, and there are problems such as a lack of reliability.

In order to solve this problem, the applicant of the present application has already proposed in Application No. 57-151617 etc. that all mechanical mechanisms and human operations are not used except for the air supply device for standing up. Instead, we proposed a device that automatically prepares for lodging and raising according to increases and decreases in river flow, and it has been actually used as an operating device for a bag-shaped relief weir that solves the above-mentioned problems.

However, this patent application filed in 1983. - The operating device proposed in No. 151617 etc. is configured to automatically collapse the bag-like weir body with a mechanism that has a relationship with the downstream water level, so after the weir is installed, the water level can be set according to the downstream river improvement. When the downstream water level drops further, a new problem arises in that the lodging of the bag-like weir body is delayed until the downstream water level reaches the set water level.

Moreover, since the exhaust pipe was constructed with a narrowed end, there was a problem in that it was difficult to quickly exhaust the inside of the weir.

(Object of the Invention) An object of the present invention is to provide an operating device for a bag-like weir body that can solve the above-mentioned problems.

(Structure of the Invention) In order to achieve the above object, the present invention includes: a control room that opens into the river on the upstream side of a bag-like weir body that rises and falls by supplying and discharging air; The exhaust tank includes an exhaust tank, a backflow prevention tank, a water supply tank, a control tank, and a siphon pipe whose one end opens to the control room and whose other end opens to the river downstream of the weir body, and the exhaust tank is a supply and discharge pipe. communicate with the bag-like weir body through the exhaust tank, and also raise an exhaust pipe from the exhaust tank to open it to the atmosphere, and enter a water supply pipe connected to the exhaust pipe into the backflow prevention tank and open it,
One end of the communication pipe is opened at the bottom of the backflow prevention tank, and the other end of the communication pipe is entered into the water supply tank and opened, and the water supply tank is communicated with the control room and with the siphon pipe through a breaker pipe. Further, the control tank is connected to the control tank by an intake pipe that opens in the water supply tank at the height of the overflow water level and a U-shaped pipe that opens at a slightly higher place than the air guide pipe, and the control tank is connected to the air guide pipe. It is characterized by being configured to be open to the atmosphere.

(Example) First, as shown in Figs. 1 and 2, the weir body 1 consists of a bag that is traversed across a river and fixed to the river bed with a fixing fitting 2, and the air supply/discharge port 3 is used to supply air. supply and exhaust.

An air supply source A and a control room B are installed on the riverbank as operating devices for supplying and discharging air to and from the bag-shaped weir body 1.

Figure 2 shows the details of control room B. The numerical values shown in the figure are based on the riverbed of 1l100 and the weir height of 1.00.
The preferable height of each part from the river bed is shown as a ratio to the set weir height for an example in which the overflow water at the time of collapse is 20% and the downstream water depth at the time of upright is 20%.

The control room B opens to the river upstream of the weir body 1 (hereinafter referred to as the river upstream of the weir). 4 is a shielding plate that partitions the control room B from the river upstream of the weir, and 5 is a mud shielding plate that stands up from the riverbed. A water guide hole 5a is provided in the mud shield plate 5 at a location slightly higher than the river bed.

Inside the control room B, an automatic collapse mechanism 10 and a supercharging prevention mechanism 20 are installed.
The automatic lodging mechanism 10 automatically lowers the weir body 1 when the water level on the upstream side of the weir body 1 exceeds a set lodging water level (hereinafter referred to as the lodging water level).
It has the function of discharging the air inside.

The supercharging prevention mechanism 20 prevents the weir body 1 from being air-supplied during air supply work to the weir body 1.
The safety exhaust mechanism 30 has a function of automatically discharging the air inside the weir body 1 when the pressure inside the weir body 1 becomes abnormal. It functions as a safety measure to expel the air inside.

The automatic lodging mechanism 10 includes an exhaust tank 110, a control tank 120, a water supply tank 160, a backflow prevention tank 140, and a siphon pipe 150.
It is equipped with

The exhaust tank 110 is in communication with the air supply source A and the weir body 1 via the supply/discharge pipe 6. An exhaust pipe 111 stands up from the exhaust tank 110, and the lower end of the exhaust pipe 111 enters the exhaust tank 110 and opens at a height slightly lower than the river bed. Further, an exhaust frame 112't is attached to the lower end of the exhaust pipe 111, and a ventilation membrane 115 is provided on the top surface of the exhaust frame 112. The gas permeable membrane 113 has air permeability when its both sides are in contact with air, but when its lower side is in contact with water, the air permeability is cut off due to the surface tension of the water due to the pressure difference between the water and air. material and structure. The upper end of the exhaust pipe 111 opens at a location slightly higher than the collapsed water level of the weir body 1 and is open to the atmosphere. This exhaust pipe 111 is connected to a water supply pipe 141 in the middle.

The water supply pipe 141 enters the backflow prevention tank 140 and opens at a location slightly lower than the set weir height. One end of a communication pipe 142 is open at the bottom of the backflow prevention tank 140 . Communication pipe 1
42 is bent into a U-shape, and the lowest part thereof is set at a height below the standing water level.

Although the other end of this communication pipe 142 enters into the water supply tank 130, it is preferable that the other end is opened at the same height as the opening of the water supply pipe 141 in the backflow prevention tank 140 described above.

The inside of the water tank 130 is divided into two rooms by a partition wall 151 whose frest is slightly lower than the lodging water level, and a projection 162 is provided on the top surface of the water tank 130, which is set at the lodging water level, to protrude upward according to the lodging water level. The protrusion 132 is in communication with the siphon tube 150 through a breaker tube 133. The control tank 12 is located in the chamber in which the protrusion 132 exists in the water supply tank 130.
An intake pipe 121 and a U-shaped pipe 122 extending upward from 0 enter, and the upper end of the intake pipe 121 is opened at the height of the collapse water level, and the upper end of the U-shaped pipe 122 is opened slightly above the intake pipe 121. It should be opened at a high place. On the other hand, the other chambers in the water supply tank 130 are communicated with the control chamber B via a water conduit 134 that opens at the bottom of the chamber. The water guide pipe 143 is disposed near the siphon pipe 150 so that the opening at its lower end is not filled with sediment, and the diameter of the lower part of the water guide pipe 143 is enlarged to prevent water passing through the water guide pipe 143. Care was taken to reduce the speed of the upward flow. As a result, water supply $
This is to prevent earth and sand from entering into the 130.

The lower ends of the water suction pipe 121 and the U-shaped pipe 122 are connected to the control tank 120.
The ventilation frame 12 is placed at the lower opening edge of the water suction pipe 121.
3 and attach the ventilation membrane 124 to the top surface of the ventilation frame 123.
It is set up. The lower edge of the ventilation frame 123 is equal to the river water level at which the weir body 1 should rise (hereinafter referred to as the rising water level). On the other hand, the U-shaped tube 122 has a U-shaped portion 1 inside the control tank 120.
25 is provided. The lower end opening of the U-shaped tube 122 is located at a slightly higher location than the gas permeable membrane 124, and the upper surface of the lowest portion of the U-shaped portion 125 is located at a slightly lower level than the standing water level. The control tank 120 is opened to the atmosphere through an air guide pipe 126. A check pulp 127 is provided in the air guide pipe 126, and by closing the check pulp 127, it is possible to check whether there is any abnormality in the automatic lodging function of the weir body 1.

The water intake port 151 of the siphon tube 150 is sufficiently constricted to make its opening area small, thereby preventing the interior of the siphon tube 150 from becoming full due to overflow from the frest of the siphon tube 150, thereby achieving an air entrainment effect. I try to do it.

The drain port 152 of the siphon pipe 150 opens into the river downstream of the weir.

Reference numeral 153 indicates a saucer, and the side wall of this saucer 153 surrounds the water intake port 151 of the siphon tube 150.

Next, the configuration of the supercharging prevention mechanism 20 will be explained.

The supercharging prevention mechanism 20 includes a supercharging prevention tank 201 and a water holding pipe 202 that stands up from the bottom of the supercharging prevention tank 201. A supply/discharge pipe 6 connected to the air supply source A and the weir body 1 enters into the supercharging prevention tank 201. The height of the water storage pipe 202 is set to the height of the lower end of the supply/discharge pipe 6 plus the height of the water column corresponding to the atmospheric pressure generated at this time.

On the other hand, the supercharging prevention tank 201 is opened to the atmosphere through an escape pipe 203, and the escape pipe 205 is equipped with a horn 204 and a volume control valve 205. When a predetermined amount of air is sealed in the weir body 1, air blows out from the lower end of the supply/discharge pipe 6 in the supercharging prevention tank 201 and is released from the escape pipe 203, but a part of the air blows the horn 204. When the vehicle passes by, a sound is emitted, and the horn is used to issue a command to stop the operation of the air supply source A.

The safety exhaust mechanism 30 has a safety exhaust tank 601 disposed below the river bed. The safety exhaust tank 301 is connected to the air supply source A and the weir body 1 via the supply and exhaust pipe 6, and the safety exhaust pipe 302 is extended upward from the safety exhaust tank 501 to be opened to the atmosphere in the river downstream of the weir. There is. The lower end of the safety exhaust pipe 602 is inserted into the safety exhaust tank 601 and opened, an exhaust frame 303 is attached to the lower opening edge of the safety exhaust pipe 302, and a ventilation membrane 304 is installed on the top surface of the exhaust frame 503. It is a provision. A water replenishment hole 305 is provided in the safety exhaust pipe 302, and the opening area of the water refill hole 305 is made sufficiently small so that when the water level in the control room B is high, the inflow of water from the water replenishment hole 205 inhibits complete exhaustion. Care must be taken to ensure that this is not the case.

The operation of the operating device having the above configuration and the functions of each part will be explained.

(1) Raising the weir body The height of the lower end of the supply/discharge pipe 6 in the supercharging prevention tank 201 is set to a height that can withstand the atmospheric pressure that normally occurs in the fully erected state. 1, if abnormal pressure is generated in the weir body 1 due to sedimentation or other factors upstream of the weir body 1, it will be exhausted from the supercharge air prevention tank 201, and it will function as an overpressure prevention means. . however,
Since the air supply work is carried out quickly, the water level of the river downstream of the weir is usually significantly lower than the predetermined weir raising water level, so even if a predetermined amount of air is sealed in the weir body 1, the pressure generated at this time is , significantly lower than if the water level of the river downstream of the weir had reached the specified height. Therefore, the upper end of the water storage pipe 202 is set at a height equal to the height of the lower end of the supply/discharge pipe 6 plus the height of the water column corresponding to the atmospheric pressure generated at this time. When the amount of air is sealed in the weir body 1, air is ejected from the lower end of the supply/exhaust pipe 6 and released into the atmosphere from the air escape pipe 203, and a part of it passes through the horn 204, emits a sound, and blows the air. Command to stop operation of supply source A. In this way, the weir body 1 is completely erected and the water level upstream of the weir body gradually rises, but the secondary water level rises above the upper end of the water storage pipe 202 and the weir body 1
As the internal pressure increases due to water pressure applied to control room B
The water level inside also rises through the water introduction hole 5a, and the supercharging prevention tank 2
Since the water pressure in the weir body 1 also increases, there is no possibility that a small amount of air will be inadvertently discharged from the weir body 1.

Similarly, the safety exhaust tank 601, which communicates with the weir body 1 via the supply/drainage pipe 6, was also water-sealed with water that had flowed in from the water replenishment hole 305 in the previous standing state, and the exhaust gas m110
Also, when the water level has already decreased due to the rising water level, the water supply tank 1'5
Since the inside of the container is filled with water, air is prevented from discharging in either case.

In this way, when the water level upstream of the weir body reaches a predetermined weir raising water level or higher, overflow starts from above the frest of the siphon pipe 150, but since the opening area of the water intake port 151 is sufficiently small, the inside of the siphon pipe 150 is is never in full flow,
In addition, the amount of air discharged by the air entrainment action of the siphon tube 150 is compensated for by the initial freezing path in the air guide pipe 126, so the water in the exhaust tank 110 is not discharged and the upright state is still maintained. It will be done.

(2) Next, the automatic lodging function will be explained.

When the water level upstream of the weir body reaches a predetermined weir raising water level or higher due to rainfall, etc., a water level equal to that of the control room B is formed in the chamber on the water guide pipe 134 side of the partition wall 131 in the water tank 160, and water flows into the bottom of the chamber along with the flowing water. The sediment has settled. When the water level further rises and exceeds the partition wall 131 and reaches the collapsed water level, water flows into the control tank 120 from the upper end opening of the intake pipe 121.
As the water level in the control tank 160 rises, the ventilation frame 123 that had previously been supplying air into the siphon tube 150
The gap below the ventilation membrane 124 on the top surface is narrowed and the amount of air supply is drastically reduced. On the other hand, the air in the siphon pipe 150 is discharged from the drain port 152 by overflow water from the frost, becomes diluted, and is then drained from the water conduit pipe 134. Rather, it absorbs water and siphon tube 15
The degree of vacuum within 0 increases at an accelerated rate. In this way, the inside of the water supply tank 160 is cut off from the water, and the water level in each part rises due to the negative pressure inside the siphon pipe 150, and finally all the air in the breaker pipe 163 and the siphon pipe 150 is exhausted. °, forming a so-called siphon phenomenon. Through this series of operations, the inside of the exhaust tank 110 is
According to the internal pressure of the breaker pipe 1 from the exhaust frame 112
The water level is lowered by the drainage to the path connected to the exhaust frame 112, and the water level is lowered to the lower end of the exhaust frame 112, and exhaust is started. At the same time, the ventilation membrane 116 on the top surface of the exhaust frame 112 comes into contact with air on both the upper and lower surfaces, thereby restoring air permeability. As a result, the inside of the exhaust tank 110 becomes close to atmospheric pressure and reverse flow starts, but the water heads in the siphon pipe 150, water tank 130, and communication pipe 142 are already lower than the upper end opening of the water supply pipe 141. Therefore, the water in the water supply tank 160 is transferred to the exhaust tank 110.
Only a small portion of the water in the water supply pipe 141 falls into the exhaust tank 110 without flowing back into the interior, and the ventilation membrane 113 on the top surface of the exhaust frame 112 is not submerged, and the inside of the weir body 1 is completely filled with air. On the other hand, the air in the weir body 1 is pushed out by the water pressure of the upstream river, so it is completely exhausted and the weir body 1 is collapsed. In this way, the water head inside the siphon tube 150 is 1
Since the water is completely evacuated when the water level reaches 190 or less, there is no problem even if the water level downstream of the weir is relatively high, which has the advantage that it does not interfere with the automatic lodging of the weir body.

In addition, to add a supplementary explanation about the mechanism during the collapse, it is expected that mud will accumulate inside the control room B because flowing water containing suspended sediment passes through the inside of the control room B. Since 151 is surrounded by the side wall of the receiving tray 153, even if sediment is generated, it will always be sucked into the siphon 150 along with running water, so there is no fear that the siphon pipe 150 will not operate. In addition, the water conveyance pipe 134 is provided with a siphon pipe 15 so that the lower part thereof is not buried with sediment.
However, in order to avoid the water level in the water conduit 134 from being different from the water level in the control room B due to the influence of streamlines flowing into the water inlet 151, the water inlet 151 can be lowered to a height near the river bed. be.

(3) Inspection of automatic lodging function.

Inspection valve 127 provided to constantly inspect the lodging function
By closing the siphon tube 150, the air supply to the inside of the siphon tube 150 is cut off.

By closing the inspection pulp 127, the negative pressure in the siphon tube 150 increases, and water flows into the control tank 120 from the intake pipe 121, causing the weir body 1 to collapse, as in the case of automatic collapse described above. It should be noted that during this inspection and lodging, the water level in the control tank 120 rises to the upper end opening of the U-shaped tube 122. The 0-shaped part 125 of the U-shaped pipe 122 already contains water that entered during the previous lodging, but compared to the height of the water column when this water is spread out in the vertical part,
At the time of inspection and lodging, the water level downstream of the weir is low and the negative pressure inside the siphon pipe 150 is high. From this, when the ventilation membrane 124 is submerged, the water in the 0-shaped part 125 is pulled up to the water tank 130 side and air is sucked in from the opening, and the air in the control tank 120 continues until the upper end opening of the U-shaped tube 122 is submerged. Without being discharged, the ventilation membrane 124 of the ventilation frame 123 is submerged in water, creating a condition in which the surface tension of water, which is necessary to prepare for standing up as described below, works during the collapse.

Furthermore, even if there is a large flood during lodging for inspection, since the inspection pulp 127 is tightened, there will be no flooding as described above and there will be no problem.

(4) Next, the stand-up preparation function will be explained.

Open the inspection pulp 127 and repeat. As the river water level decreases when the weir body 1 is in the collapsed state, the water in the control tank 120 is discharged through the breaker pipe 123, and the water level becomes equal to the river water level. Therefore, when the river water level drops to the standing water level, and in this embodiment reaches 0.20, the ventilation frame 12
3, the ventilation membrane 124 of the ventilation frame 123 comes into contact with the air on both the upper and lower surfaces and restores ventilation, so air is sucked into the water tank 130 and the breaker pipe 1
33 and the inside of the water tank 160 are replaced with water and air sequentially from the top, and the water in the water tank 130 falls through the water supply pipe 141 etc. into the exhaust tank 110 and the exhaust pipe 111, and the water inside the exhaust tank 110 is The water level rises, the ventilation membrane 113 of the exhaust frame 112 is submerged, and the inside of the exhaust tank 110 is cut off from the atmosphere. Therefore, the communication pipe 142 of the water tank 130
The volume of the side chamber is sufficiently large. Good luck, control tank 1
The water surface inside 20 is the total amount of water inside the U-shaped pipe 122, the intake pipe 121, the ventilation frame 123, and the protrusion 132 on the top surface of the water tank 130.
The volume of the control tank 120 is large enough to prevent the ventilation membrane 124 of the ventilation frame 123 from being submerged, although some of the water in the tank flows in and rises. On the other hand, from the water pipe 134, the water in the chamber on the water pipe 134 side of the water supply tank 130 above from the lower end opening and mainly the water in the enlarged diameter part of the water pipe 134 fall into the control room B, and the sediment around the lower end opening flows into the control room B. In addition, since the inside of the siphon pipe 150 also communicates with the atmosphere and the inside of the control room B is separated from the water level downstream of the weir, the operation of the air supply source A is controlled. Once the water is started, only one weir body is raised, but even if air is supplied before the water level reaches the rising water level, all of the air is exhausted from the exhaust pipe 111 and the weir body 1 does not rise.

By the way, there may be a situation in which the river water level rises again when the river is in the lying down state after the preparation for standing is completed, and water flows into the control tank 120. In this case, when the water level reaches the collapse water level, the control tank 12 is also opened from the upper end of the intake pipe 121.
As in the case of automatic lodging, the fact that water flows into the chamber and the ventilation membrane 124 of the ventilation frame 123 is flooded is the same as in the case of automatic lodging.
When the lower end opening of the U-shaped pipe 122 is submerged in water, the inside of the protrusion 162 at the top of the water tank 130 and the inside of the breaker pipe 133 are cut off from the atmosphere and become pressurized, so no matter how much the water level downstream of the weir rises, the breaker pipe 133 remains A siphon phenomenon cannot be formed. However, when the river water level starts to drop, the water in the control tank 120 overflows from the upper end opening of the intake pipe 121 and is discharged from the path of the water guide pipe 126 in response to the drop in the river water level, and the water in the control tank 120 is discharged from the path of the water guide pipe 126, which is the same as the normal standing preparation function. There is no need to worry because the ventilation membrane 124 of the ventilation frame 123 will be exposed to the atmosphere when the water level is near the standing water level.

(41 Failure of siphon tube If the siphon tube 150 does not operate for some reason, i.e. water intake 0151 or drain port 15
2 is blocked, the water level in the control room B is equal to the water level upstream of the weir body, and the water seal height in each exhaust tank rises equally. Since the water seal height is limited by the height of the water seal, when the internal pressure of the weir body 1 reaches the water seal level or higher, exhaust starts from the lower end of the exhaust frame 503, and the ventilation membrane 304 on the top surface becomes air permeable. is recovered, the air in the weir body 1 is exhausted, and the top of the layer is lowered. In this case, while the water level in control room B is high, the safety exhaust pipe 501
There is no water flowing in from the water supply hole SOS in the exhaust frame 303.
Since there is a risk that the ventilation membrane 604 of the pump may be submerged in water and complete exhaustion may not be achieved, no consideration is given to setting the opening area of the water replenishment hole 305 sufficiently small to prevent this. If this safety exhaust mechanism 30 is activated, it will not stand up unless water is artificially injected, and this will serve as a signal indicating an abnormality in the device.

The basic operation has been explained above, but in addition to the above, if you want to collapse the weir body 1 regardless of the height of the water level upstream of the weir body, open the artificial air release valve 7, If there is a large amount of sediment on the layer, the gate valve 8 is closed and the air supply source A is operated to remove the sediment.

Immediately after the installation of the device, first, water is poured into the supercharging prevention tank 201, the safety exhaust tank 301, and the exhaust tank 110, respectively, and then the air supply source A is started to be operated, so that the weir body 1 is erected. Furthermore, for the seat valve, a shielding plate 4,
In addition, the mud shielding plate 5 prevents the mud from entering the control room B.

(Effects of the Invention) As explained above, in the present invention, water flows into the intake pipe opened at the level of the lodging water level in the water tank without depending on the water level of the river downstream of the weir. The weir can be automatically lowered, and the operation of the weir will not be affected even if there is a change in the downstream water level due to the improvement of the river downstream of the weir.

In addition, the lower end opening of the exhaust pipe, L, TE, , phosphorus, oj~・
' 4 liters of air can be quickly expelled from the body.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing an embodiment of the present invention, and FIG. 2 is a system diagram of the embodiment of the present invention. A... Air supply source B... f (jlJ Omuro 1... Weir body 6... Supply/exhaust pipe 10... Automatic lodging mechanism 20... Supercharging air prevention mechanism 50... Safety exhaust Mechanism 110...Exhaust tank 120...Control tank 130...Water tank 140...Backflow prevention tank 150...Siphon 111...Exhaust pipe, 112...Exhaust frame 113...
・Vent membrane 121...Intake pipe, 122...U-shaped pipe 125-...
Air guide pipe, 125... U-shaped portion 131... Partition wall, 13
2... Projection 133... Breaker pipe, 134 Center water pipe, 141... Water supply pipe, 142... Communication pipe, 151
...Water inlet, 152...Drain port Patent applicant Toyo Ogyo Co., Ltd. 7-C) Representative patent attorney Yumi Sakai ,', :) (l God (and 1 other person)

Claims (1)

[Claims] (1) A control room that opens into the river on the upstream side of a bag-like weir body that rises and falls by supplying and discharging air and air, and an exhaust tank, backflow prevention tank, water supply tank, and control tank that are equipped with pressure in the control room. and a siphon pipe having one end open to the control room and the other end opening to the river downstream of the weir body, and the exhaust tank is communicated with the bag-like weir body via a supply and discharge pipe. An exhaust pipe is erected from the exhaust tank and opened to the atmosphere,
A water supply pipe connected to the exhaust pipe is entered into the backflow prevention tank and opened, and the other end of the communication pipe whose one end is opened at the bottom of the backflow prevention tank is entered into the water supply tank and opened,
The water supply tank is connected to the control room and communicated with the siphon pipe through a breaker pipe, and further includes an intake pipe that opens in the water tank and at a high pitched level of the overflowing water level, and an intake pipe that opens at a slightly higher place than the intake pipe. An operating device for a bag-shaped undulating weir, characterized in that the control tank is connected to the control tank by a U-shaped pipe, and the control tank is opened to the atmosphere by an air guide pipe.