JPH0420042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a semi-automatic control device for a bag-shaped undulation weir.

(Prior art) A so-called bag-like relief weir is a weir constructed across a river, made of cloth-lined rubber, etc., by injecting water or air into it to raise it up, or by discharging it and causing it to collapse. The structure is simple, no painting is required, and
Even without power, it can be easily lowered,
Since they do not require a backup power source, they have recently been widely used in place of steel floodgates.

However, conventional products cannot adjust the water level upstream of the weir body, causing flooding damage during small floods that do not reach collapse, and also require constant adjustment of the opening of the intake gate according to changes in water level. However, when the bridge was toppled, unnecessary stored water would be released all at once, posing the risk of causing a man-made disaster in the downstream area. Furthermore, since this method uses water guide pipes to guide flood water inside the embankment and uses floating bodies to operate the valves, it is necessary to install water guide pipes, and there are other problems associated with mechanical methods, such as the risk of failure. Ta.

(Object of the invention) Therefore, the present invention is capable of adjusting the water level,
The present invention aims to provide a more convenient control device that detects the water level outside the embankment, eliminates the need for water guide pipes, and controls the water level by a method that does not rely on any mechanical methods.

(Structure of the Invention) In order to achieve the above object, the control device of the present invention includes a weir body 1 that is installed in a direction across a river and is composed of an outer tube 4 and an inner tube 5, and a weir body 1 that is open to the river upstream of the weir body. The control device room 3 includes a supercharging prevention tank 11, an exhaust tank 12, a control tank 13, and a backflow prevention tank 11, an exhaust tank 12, a control tank 13, and It includes a prevention tank 14 and a water supply tank 15, the supercharging prevention tank 11 and the exhaust tank 12 communicate with a device that supplies air to the inner tube 5, and the exhaust tank 12 is an emergency siphon that opens into the river downstream of the weir. 32a and communicates with the atmosphere via an air discharge pipe 29, and the exhaust tank 12 and water supply tank 15 are connected to the backflow prevention tank 14 and the water supply pipe 31.
The control tank 13 and the water supply tank 15 communicate with each other through an air supply pipe 22 and communicate with the atmosphere through an air guide pipe 19. The saw-shaped opening 24a at the end opens into the water tank 15, and the inside of the water tank 15 is connected to the control device room 3 via the water pipe 25.
It is characterized by communicating with the flowing water inside.

(Embodiment) The present invention relates to a semi-automatic control device for a bag-shaped undulating weir. In the figure, the river bed is set at 0.00, the height of the overflow water at the weir body 1 is set at 1.00, and the height of each element is expressed as a ratio to these heights. The weir body 1 crosses the river over its entire length, and consists of an outer tube 4 whose end is fixed to the riverbed with metal fittings, and an inner tube 5 built therein with an airtight structure. The air blower 2 consists of a blower and a prime mover that drives the blower, and is disposed within the embankment. The control device room 3 is a flow channel that opens to the river approximately upstream of the weir and finally opens to the river mouth downstream of the weir via a siphon, and is located within the bank at the weir location.

One end of the water pipe 6 opens into the outer tube 4 , and the other end thereof opens into water near the downstream end of the control device room 3 . The inside of the inner tube 5 communicates with the air supply device 2 through a ventilation pipe 7 and an air supply pipe 8. There is a water passage plate 9 across the control device room 3 immediately upstream of the downstream opening of the water passage pipe 6, and this water passage plate 9
has a small-area water inlet 9a at a height near the riverbed, and an emergency water outlet 9b near a predetermined weir water surface. There is a siphon 10 at the downstream end of the control equipment room 3. This siphon 10 opens near the river bed downstream of the weir, but has a structure that can form a siphon hydraulically, and its crest is located above the weir. slightly lower than the water level. In addition, inside the control equipment room 3, there is a supercharging air prevention tank 11 that penetrates from a position lower than the river bed to above the water surface.
There are an exhaust tank 12 and a control tank 13 arranged near the bottom of the water, and a backflow prevention tank 14 and a water supply tank 15 arranged near the water surface, all of which are kept in a sealed state.

In the supercharging prevention tank 11, one end of the branched vent pipe 7 hangs down from above and opens near the riverbed level. Further, one end of the refilling water pipe 16 opens on the side surface of the ventilation pipe 7 at a position lower than this opening, and the other end extends upward, and its tip opens slightly below the designed water level when the weir is erected. The height of the opening of the ventilation pipe 7 and the opening of the water supply pipe 16 is the height of the inner tube 5.
It is designed to obtain water pressure that counteracts the atmospheric pressure inside when standing up. An air escape pipe 1 is installed on the top surface of the supercharging prevention tank 11.
7 and a horn 18 are connected, and the other ends of both are open to the air. The diameter of the air escape pipe 17 is such that pressure is applied to the air in the supercharging prevention tank 11, and as a result,
The appropriate amount of air is determined so that it passes through the horn.

An air guide pipe 19 whose other end opens into the air is connected to the top surface of the control tank 13, and a check valve 20 is provided in the middle thereof. Inside the tank 13, there is provided an air supply frame 21 whose lower end matches the river water level (0.20) to be raised, whose sides are sealed, and which has a ventilation membrane 21a on the top surface, and an air supply frame 21 connected to the top surface. The upper end of the trachea 22 opens near the top surface inside the water tank 15. The ventilation membrane 21a is made of cloth and exhibits good air permeability when both sides are in contact with air, and when one side is in contact with water, a material that prevents ventilation is stretched due to its surface tension. Depending on the capacity of the ventilation membrane, the height of the air supply frame is determined to be as large as possible. In addition, the tank has an opening slightly higher than the ventilation membrane 21a and an upper inner surface that is reversed and rises from a position slightly lower than the lower end of the air supply frame 21, and an upper end that is slightly higher than the air supply pipe 22. There is a U-shaped tube 23 having a. Water tank 15
The upper end of the partition plate 15a is slightly lower than that of the air supply pipe 22. A saw-shaped opening 24a of the breaker 24 is opened at the height of a predetermined weir water surface in the right section of the partition plate 15a, and a small-diameter intake port 24b is opened at the same height as the upper end of the air supply pipe 22. , the other end opens at the top surface of the siphon 10, and a water conduit 25 branches from the bottom surface of the same section as the saw-shaped opening, and the lower end has an expanded diameter and opens into water below the water level at which it should stand. .
A small-diameter water suction pipe 26 branches from near the top of the breaker 24, and the other end opens at the top of a water injection pipe 27. One end of the water injection pipe 27 opens downward to a portion below the water level above the weir in the right section of the water supply tank 15, and the other end is opened sufficiently above the water level sucked up by the negative pressure generated by the siphon 10 during water level adjustment. , in order to set the inner and lower surfaces at a position lower than the surface of the water being sucked up during lodging, via the top,
It is reversed and opens downward at a position lower than the lower end of the air supply frame 21 in the control tank 13 .

In addition, one end of the branched ventilation pipe 7 is opened on the side of the exhaust tank 12, and an exhaust frame 28 having the same structure as the air supply frame 21 is built in. An air discharge pipe 29 is connected to this, and the other end is opened in the air. It is open to On the way, the water supply pipe 30 branches from a sufficiently low position, that is, a position lower than the water level in the air discharge pipe 29 at the time of starting exhaustion when the air pressure in the inner tube 5 is weak at best, and the other end is in the backflow prevention tank 14. The water pipe 31 that opens at the top and near the bottom of the
After passing through a position lower than the lower end of the air supply frame 21, it reverses upward and opens at the same height as the water supply pipe 30, considerably above the bottom surface in the left section of the water supply tank 15. Both of these openings are lower than that of the air supply pipe 22 by the amount of water required to seal the exhaust tank 12 etc., but the upper end of the air supply frame 22 is lower than that of the water supply pipe 22.
It is set as high as possible based on the upper end of the water supply tank 15 and the U-shaped pipe 23.

The vertical position of the exhaust frame 28 is determined in consideration of the upper end of the water supply pipe 30 and the atmospheric pressure inside the inner tube 5.

In addition, as a safety device, at the bottom of the exhaust tank 12,
Emergency siphon 3 that is sufficiently large compared to the water supply pipe 30
2a opens, passes through the crest at the same height as the upper end of the water supply pipe 30, turns upward again from approximately half the height of the weir height, and rises higher than the upper surface of the lowest end into the river downstream of the weir body. There is a small drainage port 32b near the exit. Air discharge pipe 29 and emergency siphon 3
The exhaust tank side of 2a is communicated with an air supply pipe 32c having almost the same height and diameter as the water supply pipe 30, and the same small starting pipe 32d opens at the upper end of the exit side of the emergency siphon 32a, and the other end is connected to a predetermined height. Open your eyes,
The upper part and the sides are closed by the cap metal fittings 32e,
Together, this part also constitutes a siphon. Further, the other end of the mud drain pipe 33 that opens immediately upstream of the water passage plate 9 and passes through it is connected to a siphon 10.
It opens inside the downstream side.

An emergency exhaust pipe 34 branches off from a position suitable for operating the air pipe 8, and the other end opens into the air via an emergency exhaust valve 35. Furthermore, the ventilation pipe 7
A forced rise valve 36 is provided in the ventilation pipe 7 between the connection point of the air supply pipe 8 and the supercharging prevention mechanism 11.

As a countermeasure against other dust and sedimentation, the upstream entrance of the control equipment room 3 has a water passage section at the lower end, and is located at a position that almost coincides with the river revetment surface, shielding it from above the water surface. 37, and downstream there is a mud shield plate 3 that reaches approximately half the height of the weir height from the river bed.
There are 8. Further, there is a cleaning pipe 39 provided with a cleaning valve 40 on the bottom surface of the right end of the left side section of the water supply tank 15.

Next, the effect will be explained. First, I will explain the standing function. At the start of rising, the supercharging prevention tank 11 and the exhaust tank 12 are filled with water, but this will be described later. Therefore,
By operating the air supply device 2, air is supplied into the inner tube 5, and when the atmospheric pressure increases, air is blown out from the opening of the ventilation pipe 7 into the supercharging prevention tank 11 against water pressure, and the air is blown out into the inner tube 5. The air bubbles rise and are released into the atmosphere through the air escape pipe 17 and horn 18. At that time, the horn 18 sounds an alarm, and the air supply device 2
operation will be stopped. As a result, the flowing water of the river is dammed, flows over the mud shield plate 38, and flows through the water inlet 9.
The water flows into the outer tube 4 through the water pipe a and the water pipe 6, and the buoyancy of the inner tube 5 causes the weir crest and the upstream river water level to continue to rise. When the upstream water level approaches a predetermined level, overflow occurs from the crest of the siphon 10. On the other hand, since the series of flow channels are narrowed at the water inlet 9a position, the water level inside the weir that can be used for erection is equal to the upstream water level. The upstream water level reaches a predetermined height, although the circumferential lengths of the outer tube 4 and inner tube 5 are made sufficiently large.

Next, the water level adjustment function will be explained. When the upstream water level reaches a predetermined height, the air inside the siphon 10 is continuously discharged by the flowing water, and the inside of the water tank 15 is entrained by the breaker 24 and becomes negative pressure. Air is replenished from the air conduit 19, but water supplied from the water conduit 25 causes the saw-shaped opening 24
Since a is half submerged and narrowed, siphon 10
The air supply to the siphon 10 is restricted, the inside of the siphon 10 becomes negative pressure, a siphon effect occurs, the amount of drainage increases, the water level at the opening of the water pipe 6, that is, the water level inside the weir is suppressed, and the rise in the water level is stopped. However, the water level is maintained at a predetermined level. Therefore, if the flow rate decreases and the water level falls too low, this constriction will be relaxed, and if the flow rate increases and the water level rises too much, the constriction will be strengthened and the upstream water level will automatically be kept constant. dripping In addition, when the flow rate is large, the water level inside the weir is of course extremely low, but in that case, if the siphon 10 sucks in too much air and is cut off, the water level in the weir body passing through the water pipe 6 will be As the inflow increases, the upstream water level rises rapidly, and on the other hand, overflow on the crest of the siphon 10 does not occur, which may impair the water level adjustment function. However, in such a case, as the water level rises, overflow occurs from the emergency water port 9b, overflowing over the crest of the siphon 10, and the water level adjustment function is immediately restored. Moreover, at the same time, it goes without saying that the water passage capacity of the water passage port 9a and, by extension, the siphon 10 is made larger than that of the water passage pipe 6.

Next, a function that automatically collapses due to flooding will be explained. During a flood, the water level adjustment function described above automatically lowers the dam crest, but eventually the inner tube 5 comes into contact with the river bed via the outer tube 4. When this state is reached, the water level adjustment function is lost, the upstream water level rises slightly, and the saw-shaped opening 24a is submerged, but since the intake port 24b is small, the inside of the siphon 10 becomes negative pressure, and the breaker 24 and water intake pipe 26 to the water injection pipe 27, and the sucked water is injected into the control tank 13, the air supply frame 21 is submerged, and the inside of the water supply tank 15 is completely cut off from the outside world, while the air in the tank is injected into the control tank 13. Since it is sucked in and discharged from the port 24b, it becomes a negative pressure, and the water level in the water tank rises due to water being supplied from the water conduit 25 and the water supply pipe 30, reaching the upper end of the intake port 24b, and thereafter the water level in the breaker 24 rises. rises, a series of siphons are formed, and the water tank 15
The amount of wastewater from the area will increase dramatically. However, water pipe 2
5 is sufficiently small, the pressure in the water supply tank 15 drops significantly, and at the same time, the water surface in the air discharge pipe 29 and the water pressure in the exhaust tank 12 drop, and the air pressure in the inner tube 5 causes the exhaust tank to drop all at once. It is pushed down to the lower end of 28 and exhaust begins. On this occasion,
The air present in the water supply pipe 30 is removed from the backflow prevention tank 1.
4, the water level in the tank becomes slightly lower than the upper end of the water supply pipe 30, and the water level in the air discharge pipe 29 becomes higher than the water head in the water supply tank 15 by this amount. The horizontal area of the backflow prevention tank 14 is made large so that there is only a slight difference in height, so there is no problem.

Also, at the same time as the exhaust starts, the water in the water tank 15 is
The water tries to flow back into the air discharge pipe 29, but since the upper end of the water supply pipe 30 is set higher than the water head in the water tank 15 at the start of exhaustion, the backflow is blocked at this portion. Of course, some of the water in the exhaust frame 28, air discharge pipe 29, and water supply pipe 30 falls into the exhaust tank 12 again at the same time as the exhaust starts, and the lower end of the exhaust frame 28 is submerged in water, but the ventilation membrane 28a has already been submerged. Since both sides are in contact with air and restore breathability, exhaust continues through this part, and the water inside the weir is forcibly discharged by the siphon action of the siphon 10, so the weir is completely closed. fall down.

Next, the situation of each part during the lying state will be explained. As explained above, the water in the control tank 13 forms a siphon between the water in the control tank 13 and the river water at the time of collapse, and both water surfaces are linked, so when the river water level decreases to the predetermined level at which it should rise. Air is sucked in from the lower end of the air supply frame 21, and the water in the water supply tank 15 is released from negative pressure and flows into the exhaust tank 12.
The inside of the inner tube 5 is cut off from the outside world, and the inside of the inner tube 5 is cut off from the outside world. Since the ventilation membrane 21a of No. 21 has already recovered its ventilation, all preparations for standing up are completed. If the water rises above the crest of the emergency siphon 32a during the collapse, the exhaust tank 12 is already directly filled with river water, and the excess water is discharged through the emergency siphon 32a. In this state, that is, if the water level rises again without standing up in the state where the preparation for standing is completed, and the water level becomes higher than the upper end of the air supply pipe 22, water will enter the control tank 13 from now on. At that time, air supply pipe 2
When the lower end of tube 2 is submerged in water, the air inside the tube remains because the outlet passage is blocked. However, since the water in the water supply tank 15 is connected to the river via the water conduit pipe 25 and the sludge pipe 33, when the water level decreases again, it becomes negative pressure, and the water surface in the water supply pipe 22 is sucked up. Although the water level in the water tank 15 is slightly lower than the upper end of the air supply pipe 22, the crest of the partition plate 15a is lower than the upper end of the air supply pipe 22.
The air in the tank 2 spreads evenly throughout the water tank 15, and the difference in height is slight. Therefore, if the river water level becomes slightly lower than the lower end of the air supply frame 21, the control tank 21
The water in the tank overflows from the upper end of the air supply pipe 22 onto the water surface in the water supply tank 15 and is discharged through the water guide pipe 25, the water level in the control tank 13 decreases, and the ventilation membrane of the air supply frame 21 becomes air permeable. At the same time, the water in the water supply tank 15 is released from the negative pressure, but since the exhaust tank 12 etc. are already full of water, it is discharged through the emergency siphon 32a, and preparations for standing up are completed again.

Next, the automatic safety function will be explained. If the device described above does not operate normally and the upstream water level rises, water will first enter the cap 32e, but since the drainage port 32b is above the water surface of the downstream river, the internal and external water levels are the same. It is. Therefore,
When the upstream water level reaches the upper end of the starting pipe 32d, water flows into the outlet side of the emergency siphon 32a and is discharged from the outlet of the emergency siphon 32a, but since the drain port 32b is small, the outlet is submerged in water, cut off from the outside air, and the water flows out. Since air is exhausted by
Everything inside the safety device 32 becomes negative pressure, and the cap hardware 32e
Since the water level inside rises and flows in, the air inside the emergency siphon 32a is rapidly removed to form a siphon, the water level inside the air discharge pipe 29 lowers, and exhaust begins as in the case of automatic lodging. Ru. At the same time, the inside of the cap metal fitting 32e becomes atmospheric pressure due to the air supply pipe 32c, so the siphon is cut off and the starting pipe 3
Since the emergency siphon 2d is smaller than the emergency siphon 32a and its mounting position is closer to the exit than the crest of the siphon, water will not enter the exhaust tank 12. Furthermore, the partition plate 15a prevents water from entering through the water conduit 25, allowing the exhaust to continue normally. As a result, when the upstream water level becomes below the crest of the mud shield plate 38, no water flows into the control room 3, and on the other hand, it is discharged through the mud drain pipe 33, so that the water inside the weir is drained from the water flow pipe 6, Water inlet 9a and mud drain pipe 3
3, and is discharged into the downstream river, so the external water pressure becomes stronger than the internal water pressure on the weir body, and the water is completely drained and collapses.

Next, a description will be given of the function of the device when artificially toppling down a tree other than during a flood. In the upright state, if the artificial lodging valve 20 is closed, the interior of the siphon 10 is cut off from the outside air, so of course water is injected into the control tank 13 from the water injection pipe 27, and the siphon is collapsed.
The phenomena that occur in each part of the device in this case are as follows:
This is exactly the same as when a building collapses due to a flood, so you can easily and comprehensively check the functions of each part at any time.
Therefore, when artificially lodging, it is preferable to use the artificial lodging valve 20, but if all of these devices become abnormal and an emergency is required, the emergency lodging valve 35 can be opened to cause the lodging. Of course.

Also, during lodging, earth and sand accumulates on the weir body,
If it is difficult to stand up normally, close the forced upright valve 36, let it stand up halfway while keeping an eye on the atmospheric pressure, raise the dam to a certain extent, then open the emergency lodging valve 35 and let it fall down. If this is repeated, natural running water can be used. sediment can be removed.

Next, countermeasures against dust and sedimentation inside the device will be explained. Floating dust is prevented from entering the control device room 3 by the shielding plate 37, and is carried away by the flowing water of the river.
The intrusion of sediment is prevented by the mud shield plate, but regarding the accumulation of finer particles, the opening of the water holding pipe 16 is located away from the water bottom, and the water conduit 25
A sludge drain pipe 33 opens directly below the sludge pipe 33, and is constantly cleaned by a large water level difference. Furthermore, the water injected from the water injection pipe 27 into the control tank 13 at the start of lodging is in a static state while the water level is being adjusted;
Due to sedimentation, the water does not contain any soil and sand, and the water sucked from the water conduit 25 during lodging is first enlarged at the bottom to reduce the soil content, and the flow velocity is reduced. The earth and sand go directly to the breaker 24, and the earth and sand left in the water supply tank 15 are washed out when preparations for standing are completed, and the earth and sand go directly to the water pipe 25.
water is drained from the water. However, as explained above, during a flood, river water flows directly into the exhaust tank 12 and indirectly into the water tank 15. Therefore, the inside of the exhaust tank 12 tends to generate sediment and needs to be cleaned, but it can be easily cleaned by injecting water from the outlet of the air discharge pipe 29. Also, water tank 15
The openings of the pipes that open into the pipes are made quite high from the bottom surface and have a structure that allows sedimentation, and if the washing valve 40 is opened and water is poured from the water conduit 19, sedimentation can be easily removed. Can eliminate confusion. that time,
The inside of the control tank 13 is also washed at the same time, and since all the water flowing into the tank is clean water, this is sufficient.

(Effects) Since the control device according to the present invention does not have any mechanical parts, it has a simple structure, fewer failures, and is inexpensive. It issues a warning while protecting the weir body by preventing air supply, and automatically maintains a constant water level while standing, regardless of the river flow rate, and automatically maintains a constant water level during floods. It is extremely convenient because it can be laid down, and furthermore, it can be artificially laid down and maintained in that state at any time, and the functions of most of the equipment can be easily inspected.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the apparatus of the present invention, and FIG. 2 is a plan view thereof. 1... Weir body, 2... Air supply device, 3... Control device room, 4
...Outer tube, 5...Inner tube, 1
0...Siphon, 11...Supercharging air prevention tank, 12...Exhaust tank, 13...Control tank, 14...Backflow prevention tank, 15...
Water supply tank, 19... Air guide pipe, 22... Air supply pipe, 24... Breaker, 24a... Serrated opening, 25... Water guide pipe,
29...Air discharge pipe, 31...Water pipe, 32a...Emergency siphon.

Claims (1)

[Claims] 1 Weir body 1 consisting of an outer tube 4 and an inner tube 5 installed in a direction across a river
and a control device room 3 that forms a flow channel that opens into the river upstream of the weir body and opens into the river downstream of the weir body via a siphon 10, and the control device room 3 includes a supercharging air prevention tank 11, Exhaust tank 12 and control tank 13
, a backflow prevention tank 14 , and a water supply tank 15 , the supercharging prevention tank 11 and the exhaust tank 12 communicate with a device that supplies air to the inner tube 5 , and the exhaust tank 1
2 is an emergency siphon 32 that opens into the river downstream of the weir body.
a, and communicates with the atmosphere through an air discharge pipe 29, the exhaust tank 12 and the water supply tank 15 communicate with the backflow prevention tank 14 through a water pipe 31, and the control tank 13 communicates with the atmosphere through an air guide pipe 19. The serrated opening 24a at the other end of the breaker 24 connected to the top of the siphon 10 communicating with the outer tube 4 opens into the water tank 15, and the water tank 15 communicates with the water supply tank 15 through an air supply pipe 22. A semi-automatic control device for a bag-shaped undulating weir, characterized in that the inside of the weir 15 is connected to the flowing water in the control device room 3 via a water conduit 25.