JPH0373692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an operating device for a bag-shaped undulating weir.

(Prior art) A bag-like undulating weir, which is constructed across a river and made of flexible material such as rubber-coated cloth, which rises and falls by supplying and discharging air, has a simple structure and operation, and is easy to paint. These days, they are widely used as water gates in place of iron gates, as they do not require a sluice.

Regarding the operation device of this bag-shaped undulating weir, conventionally, (1) since the water level is detected inside the embankment, it is necessary to install a water guide gutter pipe across the embankment in addition to the water intake gutter pipe, and (2) Since such extra embankment crossing structures are installed in close proximity to the water channel pipes, there is a risk that the embankment will collapse, (3) maintenance such as removing sediment from the water channel pipes is complicated, and (4) ) Since the water level is detected by a mechanical method, there is a risk of failure and other problems, such as a lack of reliability.

In order to solve this problem, the applicant of the present application has already proposed in Japanese Patent Application No. 57-151617 etc. that a river can be constructed without any mechanical mechanism or human operation except for an air supply device for standing up. We propose a device that automatically prepares for lodging and standing up in response to increases and decreases in flow rate.
It is actually used as an operating device for bag-shaped undulating weirs that solves the above-mentioned problems.

However, the operating device proposed in this patent application No. 57-151617 etc. is configured to automatically lower the bag-like weir body using a mechanism that has a relationship with the downstream water level. If the downstream water level drops below the set water level due to renovation, a new problem arises in that the collapse of the bag-shaped weir is delayed until the downstream water level reaches the set water level.

Furthermore, since the exhaust pipe has a narrowed exhaust end, there is a problem in that it is 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 the following:
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; an exhaust tank, a backflow prevention tank, a water supply tank, and a control tank installed in the control room; one end in the control room; and a siphon pipe whose other end opens into the river on the downstream side of the weir body, and the exhaust tank is communicated with the bag-shaped weir body via a supply and exhaust pipe, and an exhaust pipe is connected from the exhaust tank. A water supply pipe that is erected and opened to the atmosphere and connected to the exhaust pipe is entered into the backflow prevention tank and opened, and the other end of the communication pipe with one end opened at the bottom of the backflow prevention tank is connected to the water supply tank. 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 within the water supply tank and at the height of the lodging water level; It is characterized in that the control tank is communicated with the control tank through a U-shaped pipe that opens slightly higher than the pipe, and the control tank is opened to the atmosphere through an air guide pipe.

(Example) First, as shown in FIGS. 1 and 2, the weir body 1 is traversed across a river, and with the fixing fittings 2,
It consists of a bag fixed to the river bed, and air is supplied and exhausted from an air supply/exhaust port 3.

An air supply source A and a control room B are installed on the river bank 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 0.00 for the river bed and 1.00 for the weir height, and the overflow water at the time of collapse is 20% and the downstream water depth at the time of standing is 20%.
For the example in the case of 20%, the preferred height of each part from the riverbed is shown as a ratio to the set weir height.

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.

The interior of the control room B can be roughly divided into an automatic lodging mechanism 10, a supercharging prevention mechanism 20, and a safety exhaust mechanism 30. (This is called the lodging water level.)
It has a function of automatically discharging the air inside the weir body 1 when the temperature exceeds the limit.

The supercharging prevention mechanism 20 has a function of automatically discharging the air inside the weir body 1 when the pressure inside the weir body 1 becomes abnormal during air supply work to the weir body 1, and safely exhausts the air inside the weir body 1. The mechanism 30 has a function as a safety means for discharging the air inside the weir body 1 when the above-mentioned automatic lodging mechanism 10 does not operate normally.

The automatic lodging mechanism 10 includes an exhaust tank 110 and a control tank 1.
20, a water supply tank 130, a backflow prevention tank 140, and a siphon pipe 150.

The exhaust tank 110 is connected to the air supply source A via the supply and exhaust pipe 6.
and communicates with the weir body 1. 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. Also, the exhaust pipe 111
Attach the exhaust frame 112 to the lower end of the exhaust frame 112.
A ventilation membrane 113 is provided on the top surface. Ventilation membrane 11
3 is a material that has air permeability when both sides are in contact with air, but on the other hand, when one side is in contact with water, the surface tension of the water resists the pressure difference between water and air and blocks air permeability. and structure. exhaust pipe 111
The upper end of the weir body 1 opens at a slightly higher point than the collapsed water level 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,
It is opened 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 . The communication pipe 142 is bent into a U-shape, and the lowest part thereof is set at a height below the standing water level. The other end of this communication pipe 142 is entered into the water supply tank 130, and 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 interior of the water tank 130 is partitioned into two rooms by a partition wall 131 whose crest is slightly lower than the lodging water level, and a protrusion 132 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 communicated with the siphon tube 150 through a breaker tube 133. An intake pipe 121 and a U-shaped pipe 122 extending upward from the control tank 120 enter the chamber in which the protrusion 132 exists in the water supply tank 130, and the upper end of the intake pipe 121 is opened at the height of the lodging water level. In addition, the upper end of the U-shaped pipe 122 is opened slightly higher than the intake pipe 121. 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 arranged 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 made large so that the water passes through the water guide pipe 143. Care has been taken to reduce the speed of the upward flow of water. This is intended to prevent dirt from entering the water tank 130.

The lower ends of the water suction pipe 121 and the U-shaped pipe 122 enter the control tank 120, and a ventilation frame 123 is attached to the lower end opening edge of the water suction pipe 121.
A ventilation membrane 124 is provided on the top surface. Ventilation frame 12
The lower edge of 3 is set equal to the river water level at which the weir body 1 should stand (hereinafter referred to as the standing water level). on the other hand,
The U-shaped tube 122 is provided with a U-shaped portion 125 inside the control tank 120 . The lower end opening of the U-shaped tube 122 is located slightly higher than the ventilation membrane 124, and the U-shaped portion 125
The inner upper surface of the lowest part of is located slightly lower than the standing water level. The control tank 120 is opened to the atmosphere through an air guide pipe 126. The air guide pipe 126 is provided with a check valve 127, and by closing the check valve 127, it is possible to check whether there is any abnormality in the automatic lodging function of the weir body 1.

By sufficiently constricting the water inlet 151 of the siphon tube 150 to reduce its opening area,
The overflow from the crest of the siphon tube 150 causes the air entrainment effect to occur without the inside of the siphon tube 150 becoming full. A drain port 152 of the siphon pipe 150 is opened to the river downstream of the weir. 1
Reference numeral 53 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 storage pipe 20 that stands up from the bottom of the supercharging prevention tank 201.
It has 2. 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 203 is provided 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 it is ejected from the horn 2.
04, 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 301 located lower than the riverbed. Safety exhaust tank 30
1 is connected to the air supply source A and the weir body 1 via a supply/exhaust pipe 6, and a safety exhaust pipe 302 extends upward from a safety exhaust tank 301 and is opened to the atmosphere in the river downstream of the weir. The lower end of the safety exhaust pipe 302 enters into the safety exhaust tank 301 and is opened, an exhaust frame 303 is attached to the opening edge of the lower end of the safety exhaust pipe 302, and a ventilation membrane 304 is provided on the top surface of the exhaust frame 303. There is. A water replenishment hole 305 is provided in the safety exhaust pipe 302, and the opening area of this water replenishment hole 305 is made sufficiently small so that when the water level in the control room B is high, the water refill hole 2
Care has been taken to ensure that complete exhaustion is not inhibited by the inflow of water from 05.

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

(1) Erecting 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 sludge or the like upstream of the weir body 1, it will be exhausted from the supercharging air prevention tank 201, and it will function as an overpressure prevention means. fulfill. However, since the air supply work is done quickly,
Normally, the water level of the river upstream of the weir is 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 will be limited until the water level of the river upstream of the weir reaches the predetermined height. significantly lower than when reached. For this reason, the upper end of the water storage pipe 202 is set at a height equal to the height of the lower end of the above-mentioned supply/discharge pipe 6 plus the height of the water column corresponding to the atmospheric pressure generated at this time. The amount is weir body 1
When the air is filled in, 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 and emits a sound, causing the operation of the air supply source A. Command to cancel. In this way, the weir body 1 is completely erected, and the water level upstream of the weir body gradually rises, but the upstream water level is lower than that of the water retention pipe 202.
As the water rises above the upper end and the internal pressure increases due to the water pressure applied to the weir body 1, the water level in the control chamber B also rises through the water guide hole 5a, and the supercharging prevention tank 20
Since the water pressure inside the weir body 1 also increases, the required air will not be inadvertently discharged from the weir body 1.

Furthermore, the safety exhaust tank 301, which also communicates with the weir body 1 via the supply/discharge pipe 6, is also water-sealed with water that has flowed in from the water replenishment hole 305 in the previous standing state, and the exhaust tank 110 has already reached the standing water level. Since the water supply tank 130 is filled with water when the water level is reduced to 130, air is prevented from being discharged in either case.

In this way, when the upstream water level of the weir body reaches a predetermined weir raising water level or higher, overflow starts from above the crest of the siphon pipe 150, but since the opening area of the water intake port 151 is made sufficiently small, the inside of the siphon pipe 150 is The exhaust tank 110 does not reach full flow, and the path starting from the air guide pipe 126 compensates for the amount of air exhausted by the air entrainment action of the siphon pipe 150.
The water inside will not be drained and the standing state will still be maintained.

(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., the bulkhead 131 in the water tank 130
A water surface equal to that of the control room B is formed in the chamber on the side of the water conduit 134, and the earth and sand that flowed in with the flowing water is precipitated at the bottom of the chamber. When the water level further rises and reaches the collapsed water level beyond the partition wall 131, water flows into the control tank 120 from the upper end opening of the intake pipe 121, and as the water level in the control tank 130 rises, the water level in the siphon pipe 150 continues to rise. The ventilation membrane 124 on the top surface of the ventilation frame 123 that supplied air to
The lower gap is narrowed, drastically reducing the amount of air supply, and on the other hand,
The air in the siphon pipe 150 is exhausted from the drain port 152 by overflow water from the crest, becoming diluted, and water is rather absorbed from the water conduit pipe 134, so that the degree of vacuum in the siphon pipe 150 increases at an accelerated pace. In this way, the inside of the water supply tank 130 is cut off from the atmosphere, so the water level in each part rises due to the negative pressure inside the siphon pipe 150, and eventually the breaker pipe 133 and the siphon pipe 150
All the air inside is exhausted, forming a so-called siphon phenomenon. Through this series of operations, the water level in the exhaust tank 110 is lowered due to pressure due to the internal pressure of the weir body 1 and drainage from the exhaust frame 112 to the path leading to the breaker pipe 133.
2, and exhaustion begins. At the same time, the ventilation membrane 113 on the top surface of the exhaust frame 112 comes into contact with air on both the upper and lower surfaces and restores ventilation. As a result, the inside of the exhaust tank 110 becomes close to atmospheric pressure and reverse flow starts, but the siphon pipe 150, the water supply tank 130, and the communication pipe 1
Since the water head in the water supply pipe 142 is lower than the upper end opening of the water supply pipe 141, the water in the water supply tank 130 does not flow back into the exhaust tank 110, and only slightly flows into the water supply pipe 1.
Only a part of the water in the exhaust frame 110 falls into the exhaust tank 110, but 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 communicated with the atmosphere.
The air in the weir body 1 is pushed out by the water pressure of the upstream river, so it is completely evacuated and the weir body 1 is collapsed. In this way, the siphon tube 150
If the water head inside the weir falls below 0.90, it will be completely evacuated, so there is no problem even if the water level downstream of the weir is relatively high, which has the advantage of not interfering 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. 1
51 is surrounded by the side wall of the saucer 153, even if sediment is generated, it is always sucked into the siphon 150 along with running water, so the siphon tube 1
There is no fear that 50 will not work. In addition, the water conduit 134 is installed near the siphon pipe 150 so that the lower part thereof is not buried by sediment, but due to the influence of the streamline flowing into the water intake port 151, the water level in the water conduit 134 is lowered to the control room B. In order to prevent the water level from being different from the water level inside the river, the water intake port 151 is lowered to a level near the river bed.

(3) Inspection of automatic lodging function.

By closing the inspection valve 127 provided to constantly check the lodging function, the siphon tube 1
This is done by cutting off the air supply into 50. By closing the check valve 127, the negative pressure inside the siphon pipe 150 increases, and as in the case of automatic lodging described above, the water is removed from the water suction pipe 121 to the control tank 120.
Water flows inward and the weir body 1 collapses. It should be noted that during this inspection and lodging, the water surface in the control tank 120 is
It is to rise to the upper end opening of. The U-shaped portion 125 of the U-shaped pipe 122 already contains water that entered during the previous lodging, but the water level downstream of the weir is low at the time of inspection and lodging compared to the height of the water column when this water is spread out in the vertical portion. The negative pressure inside 150 is large. From this, when the ventilation membrane 124 is submerged, the water in the U-shaped portion 125 is pulled up to the water tank 130 side, air is sucked in from the opening, and the air in the control tank 120 is absorbed until the upper end opening of the U-shaped tube 122 is submerged. It will be discharged, and the ventilation frame 1
The gas permeable membrane 124 of No. 23 is submerged in water, creating a condition where the surface tension of water is exerted during the incline, which is necessary for preparation for standing up as described below.

Furthermore, even if there is a large flood during lodging for inspection, the inspection valve 127 remains closed, so as in the above case, no flooding occurs and there is no problem.

(4) Next, the standing preparation function will be explained.

Leave the inspection valve 127 open. 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, which is 0.20 in this embodiment, air is sucked in from the lower end of the ventilation frame 123, and the ventilation membrane 124 of the ventilation frame 123 comes into contact with air on both the upper and lower surfaces, improving breathability. As it recovers, air is sucked into the water tank 130 and the breaker pipe 133 and water tank 1
30 is 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, the water level in the exhaust tank 110 rises, and the exhaust The ventilation membrane 113 of the frame 112 is submerged in water and the exhaust tank 110
The interior will be cut off from the atmosphere. For this reason, the volume of the chamber on the communication pipe 142 side of the water tank 130 is made sufficiently large. In addition, the control tank 120
The water level inside rises due to the total amount of water inside the U-shaped pipe 122, water suction pipe 121, and ventilation frame 123, as well as a part of the water inside the protrusion 132 on the top surface of the water tank 130. The volume of the control tank 120 is made sufficiently large so that the gas permeable membrane 124 is not submerged in water. 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. Sand is removed to ensure good water flow, and the inside of the siphon pipe 150 also communicates with the atmosphere, separating the inside of the control room B from the water level downstream of the weir, so the operation of the air supply source A is started. If this is done, the weir body 1 will be in an upright state at any time, but even if air is supplied before the rising water level is reached, all of the air will be exhausted from the exhaust pipe 111 and the weir body 1 will not stand up.

By the way, after the above-mentioned preparation for standing up was completed and the river was in the lying down state, the river water level rose again and the control tank 12
There may also be a situation where water flows into the tank. In this case, when the water level reaches the lodging level, water also flows into the control tank 120 from the upper end opening of the intake pipe 121, and the ventilation membrane 124 of the ventilation frame 123 is submerged in water, as in the case of automatic lodging. However, when the lower end opening of the U-shaped tube 122 is submerged in water, the inside of the protrusion 132 on the upper part of the water tank 130 and
The inside of the breaker pipe 133 is cut off from the atmosphere and becomes pressurized, and no matter how much the water level upstream of the weir rises, the breaker pipe 133 cannot form a siphon phenomenon.
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.

(4) Failure of the siphon tube If the siphon tube 150 does not operate for some reason, that is, the water intake port 151,
Alternatively, if the drain port 152 is blocked, the water level in the control room B is equal to the weir upstream water level, and the water seal heights in each exhaust tank rise equally, but the safety exhaust pipe 302 in the safety exhaust tank 301 The water seal height is limited by the height of the inner bottom surface of the weir body 1.
When the internal pressure of the water seal becomes 1.40 or more, the exhaust frame 30
Exhaust is started from the lower end of the weir body 1, and the ventilation membrane 304 on the top surface restores air permeability, the air inside the weir body 1 is exhausted, and the weir top is lowered. In this case, control room B
While the water level inside is high, water flows in from the water replenishment hole 305 in the safety exhaust pipe 301, and the exhaust frame 30
Since there is a risk that the ventilation membrane 304 of No. 3 may be submerged in water and complete exhaustion may not be achieved, consideration has been given to setting the opening area of the water replenishment hole 305 to be 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, and furthermore, If there is a lot of sludge on the weir, the gate valve 8 is closed and the air supply source A is operated to remove the sludge.

Immediately after installing the device, first, the supercharging prevention tank 201, the safety exhaust tank 301, and the exhaust tank 1 are
After water is injected into each tank 10, the weir body 1 is erected by starting the operation of the air supply source A. Further, dust particles are prevented from entering the control room B by the shielding plate 4 and the mud shielding plate 5.

(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. This means that the weir can be automatically lowered, so even if the downstream water level fluctuates due to river improvements downstream of the weir, the operation of the weir will not be affected.

In addition, since there is no need to narrow down the lower end opening of the exhaust pipe, the lower end opening of the exhaust pipe is exposed to the air, so that the air in the weir can be quickly discharged.

[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...Control room, 1...Weir body, 6...
Supply and exhaust pipe, 10... Automatic collapse mechanism, 20... Supercharging prevention mechanism, 30... Safety exhaust mechanism, 110... Exhaust tank, 1
20... Control tank, 130... Water supply tank, 140... Backflow prevention tank, 150... Siphon, 111... Exhaust pipe, 1
DESCRIPTION OF SYMBOLS 12... Exhaust frame, 113... Ventilation membrane, 121... Intake pipe, 122... U-shaped pipe, 125... Air guide pipe, 125...
U-shaped portion, 131... Partition wall, 132... Projection, 133
...Breaker pipe, 134...Water conduit pipe, 141...Water supply pipe, 142...Communication pipe, 151...Water intake port, 152...
drain.

Claims (1)

[Scope of 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 an exhaust tank, a backflow prevention tank, a water supply tank, and a control tank arranged 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. A communication pipe in which 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 one end is opened at the bottom of the backflow prevention tank. The other end is introduced into the water supply tank and opened, the water supply tank is communicated with the control room and the siphon pipe through a breaker pipe, and the water supply tank is connected within the water supply tank and at the height of the collapsed water level. Operation of a bag-shaped undulating weir, characterized in that the control tank is connected to the control tank through an open intake pipe and a U-shaped pipe that opens slightly higher than the intake pipe, and the control tank is opened to the atmosphere through an air guide pipe. Device.