JPH0359205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water-type bag-shaped undulation weir operating device suitable for use on tidal rivers.

(Prior art) Weirs, which supply or discharge water or air to a hollow bag made of flexible material and raise and lower it, have recently been developed due to their advantages such as simple structure and operation, and low construction costs. They were increasingly used as water gates instead of iron doors.

However, conventional products (1) detect the water level on the inside of the embankment, so it is necessary to install a water guide gutter pipe across the embankment in addition to the water intake gutter pipe, and (2) there is also a problem with this type of redundant embankment breakage. There is a risk that the embankment will collapse because the crossing work is installed in close proximity to the water intake sluice pipe, (3) maintenance such as removing sediment from the water intake sluice pipe is difficult, and (4) mechanical methods are not suitable. It was found that there were defects such as the risk of failure and unreliability as the product twisted and collapsed.

(Object of the Invention) Therefore, the present invention fundamentally improves these problems, and provides an operating device for a bag-shaped undulating weir that has a simple structure and can be raised and lowered by supplying and discharging water. This is what we are trying to provide.

(Structure of the Invention) In order to achieve the above object, the present invention provides an operating device for undulating a flexible bag-like undulating weir provided across the entire width of a river, which includes: A pump connected to the weir body for supplying pressurized water; an equipment room opened to the river upstream of the weir body; The main siphon device has its other end opened into the downstream river at the level of the downstream river via a crest located at a higher position than the water pressure inside the weir, and the main siphon device is connected to the downstream side near the crest of the main siphon device via a communicating pipe. and an air intake device that sucks and discharges air from the main siphon device after the river water level upstream of the weir reaches the automatic collapse water level. With the above configuration, when the water level of the river downstream of the weir is high and the water level of the river upstream of the weir changes from the planned weir raising water level to the automatic collapse water level, water in the equipment room flows into the control tank from the water conduit pipe. The secondary siphon device is activated by the rise in the water level in the control tank,
Thereby, by forming a siphon in the main siphon device and communicating the weir body with the river downstream of the weir, the weir body can be easily lowered automatically.

(Example) In explaining the example of the present invention, the river bed in the figure is
0.00, the planned weir raising water level is 1.00, and the upstream water depth at the time of collapse is 30% and the downstream water depth at the time of upright is 20% of the weir height. The height is shown in the figure as a ratio to the weir height.

First, as shown in FIG. 1, a weir body 1 made of a flexible bag crosses the entire width of the river R.
One side of it is fixed to the river bed with a metal fitting 2.

The equipment room 3 that opens to the upstream river A of the weir body 1 communicates with the downstream river B via a siphon 4 that is a sub-siphon device that constitutes a part of the intake device. The equipment room 3 shall be installed on a bank, open space, etc. on the side of a river.

As shown in FIG. 2, the inside of the weir body 1 communicates with a water supply device 8 such as a pump through a water pipe 5 and a water pipe 6 branched from the water pipe 5, and the water pipe 5 extends into the equipment room 3. The top inner bottom surface 9-c has a rising portion determined according to the height of a predetermined head of water to be supplied into the weir body 1, and the cross-sectional area is reduced at the height of the river bed of the downstream river B of the weir body 1. It opens through an outflow port 9-a, and in the middle, it communicates with a drain pipe 9, which is a main siphon device whose bottom inner upper surface 9-b is slightly lower than the riverbed level. Further, the water pipe 5 is connected to the outlet 9-a by a water branch pipe 10 branched at a height lower than the river bed.
I understand.

The other end of the breaker (communication pipe) 11 that opens on the top surface of the siphon 4 opens downstream from near the crest of the drain pipe 9, and the inner bottom surface of the highest point midway is the height of the maximum negative pressure generated in the pipe in terms of water head. is slightly higher than the sum of the height of the inner bottom surface of the highest part of the drain pipe 9. Inside this breaker 11, an intake pipe 12 branched from a position slightly higher than the upper surface of the highest part of the drain pipe 9, a ventilation frame 13, a control tank 14, an air guide pipe 15,
and communicates with the atmosphere through a check valve 16. The ventilation frame 13 is sealed on the sides, the height of the lower end opening is equal to the river water level when the weir body 1 should be erected (hereinafter referred to as the erected water level), and the intake pipe 1
A ventilation membrane 13-a is provided on the top surface other than the part connected to 2.
is set up. The ventilation membrane 13-a is made of cloth, and exhibits sufficient ventilation when both sides are in contact with air, but when one side is in contact with water, the surface tension of the water causes a pressure difference between the water and air. This results in a state where there is no ventilation at all.

The water conveyance pipe 17, which opens at the lower end slightly lower than the standing water level in the equipment room 3, consists of a relatively large diameter pipe 17b that opens only downward, and a small diameter pipe 17a connected to the upper part, and the other end is opened at the highest level. The internal bottom surface of the weir body 1 is connected to the intake pipe 12 in accordance with the height of the river water level upstream of the weir (hereinafter referred to as the "lodging water level") at which the weir body 1 is to be collapsed. Further, a U-shaped pipe 18 branches from the horizontal part of the intake pipe 12, and the other end opens into the control tank 14 slightly higher than the ventilation membrane 13-a. low.

As supplementary equipment, there is a shield plate 19 at the entrance of the equipment room 3, and a mud shield plate 20 immediately downstream of it. There is a water guide hole 20-a at a slightly higher location. Further, there are saucers 21 and 22 below the water inlet 4-a and drain port 4-b of the siphon 4, respectively, and a shielding dish 23 is provided below the lower end of the water conduit 17 opening. Further, in the middle of the water distribution pipe 10, there is an artificial water discharge valve 24 that opens only when the weir body 1 is toppled, regardless of the water level. There is a shutoff valve 25 that disconnects from the water pipe 10.

In the above explanation, the volume of the control tank 14 and other structures not mentioned above will be explained together with the operation of this embodiment.

First, the standing function will be explained.

Weir body 1, which is erected with pressure water at a head slightly higher than the level of the overflow water level from the height of the river bed, has less vibration during overflow, so it can be used when the overflow water depth during overflow is relatively high. It is used in Therefore, when the water supply device 8 is operated, water is sent into the weir body 1, and the weir body 1 starts to rise. Water in excess of the required capacity is discharged through the drain pipe 9, and the water is discharged through the outlet 9.
A command is given to stop the operation of the water supply device 8 when water flows out from -a. In this way, the weir body 1 is completely erected, and the water level upstream of the weir gradually rises, but the pressure inside the weir body 1, which increases as the water level rises, is discharged through the drain pipe 9 and is always kept constant. ,Also,
Since the circumference is determined in advance based on the relationship between the internal pressure of the weir and the planned weir raising water level, the weir crest will not become unintentionally low.

In this way, the water level upstream of the weir rises and also passes through the water guide hole 20-a to the equipment room 3, which is equal to the water level upstream of the weir.
When the water level inside reaches a predetermined dam raising water level or higher, overflow will begin from the crest of the siphon 4, but since the cross-sectional area of the water inlet 4-a is made sufficiently small, the water will never reach full flow. Since the amount of air discharged by the air entrainment action of the siphon 4 is sufficiently compensated for by the path starting from the air guide pipe 15, the water in the weir body 1 is not discharged from the drain pipe 9, and the water still remains standing. State is preserved.

Next, the automatic lodging function will be explained. The water level of the river downstream of the weir has risen to about 0.70 due to the tide level, and when the water level upstream of the weir rises due to rainfall and reaches the overflow level (1.30), water is sent from the water conduit 17 into the control tank 14 into the equipment room 3. As water flows in and the water level rises, the gap below the ventilation membrane 13-a, which had been supplying air into the siphon 4, is narrowed and the amount of air supplied is drastically reduced.
The air inside is discharged from the drain port 4-b by overflow water and becomes diluted, and the degree of vacuum increases at an accelerated pace. In this way, the inside of the control tank 14 is completely shut off from the outside, so the water level in each part rises due to the negative pressure inside the siphon 4, and eventually the drain pipe 9 starts overflowing and forms a siphon by itself. Furthermore, the air inside the intake pipe 12 is discharged through the drain pipe 9,
leading to the formation of a siphon. Through this series of actions, the inside of the weir body 1 is communicated with the water level downstream of the weir, and the water inside the weir is discharged, and on the other hand, it is pushed out by the water pressure on the upstream side of the weir body 1, so that the water is completely drained and it collapses. In this way, if the water head in the siphon 4 becomes 0.90 or less, the water will be completely drained, so there is no problem even if the water level downstream of the weir is relatively high.Also, the height of the drain port 4-b can be increased, and this mechanism It has become a feature.

Please note the mechanism during lodging. Because running water containing suspended sediment passes through equipment room 3,
Although it is expected that sludge will accumulate inside the water inlet 4-
a is surrounded by a saucer 20, and even if sediment is generated, it is always sucked into the siphon 4 together with running water, so there is no fear that the siphon 4 will not operate.
In addition, the water conveyance pipe 17 is designed to prevent its bottom from being buried due to the action described later, and its lower part is made large so that the speed of upward flow is small and the transport of earth and sand into the control tank 14 is prevented. is prevented.

A check valve 16 is provided to check such a lodging function as appropriate, and by closing this valve, the air supply to the interior of the siphon 4 is completely cut off.
The negative pressure inside siphon 4 increases, and as above,
Water is injected into the control tank 14 from the water conduit 17, drained from the drain pipe 9, and the weir body 1 is collapsed. Note that during this inspection and lodging, the following points should be added:
A mechanism for raising the water level inside the breaker 4 to the opening of the U-shaped pipe 18 and a mechanism for raising the water level to the right of the breaker 11. First, the former will be explained. The U-shaped part of the U-shaped pipe 18 already contains water that flowed in 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 that is created by spreading that water in the vertical part. The induced negative pressure inside the drain pipe 9 is large, so when the ventilation membrane 13-a is submerged, the water in the U-shaped part is pulled up and air is sucked in from the opening, and the air inside the control tank 14 flows through the U-shaped pipe. Since the air is discharged until the opening 18 is submerged in water, the gas permeable membrane 13-a is submerged in water, creating a condition in which the surface tension of water necessary for preparation for standing up, which will be described below, is exerted during the incline. In addition, although the water surface heights of the left and right vertical parts of the breaker 11 that do not form a siphon are equal, the water level in the equipment room 3 is lower than the upper ends of the saucers 21 and 22, which are both at the same height and open at the upper ends. Then, the breaker 1 increases as the water level decreases.
In order to resist the negative pressure in 1, the saucers 21 and 22
As the water inside is sucked, the upper surface on the right side of the breaker rises and becomes balanced, and even if the river water level drops to zero, the water inlet 4-a and drain outlet 4-b are exposed and exposed to the atmosphere. The volumes of the saucers 21 and 22 are made sufficiently large so that they do not communicate with each other.

Next, the standing preparation function will be explained.

If the inspection valve 16 is open, as the water in the river decreases, the water in the control tank 14 is discharged through the intake pipe 12, so that the water level becomes equal to the river water level. Therefore, when the river water level reaches the standing water level, which is 0.20 in the embodiment, air is sucked in from the lower end of the ventilation frame 13, and the ventilation membrane 13-a comes into contact with the air on both the upper and lower surfaces and restores air permeability.
1. The water that has been drawn up into the interior of the intake pipe 12 etc. by negative pressure is sequentially replaced with air from a higher position. At this time, the replaced water falls into the control tank 14 and the water level rises, but the volume inside the control tank 14 is made sufficiently large so that the gas permeable membrane 13-a will not be submerged. On the other hand, sediment inside the shielding pan 23 is mainly removed by water falling from the enlarged part of the water conduit 17, improving water flow through the water conduit 17, and inside the drain pipe 9 and the siphon 4 as well. Since the inside of the equipment room 3 is separated from the water level downstream of the weir by being exposed to the atmosphere,
By operating the water supply device 8, the weir body 1 can be erected at any time.

In addition, when inspection and lodging are performed, if the water level has decreased to below the standing water level, the same operation as above will be performed.

In addition to the above, weir body 1 regardless of the upstream water level
If it is desired to topple the dam, the artificial water discharge valve 24 is opened, and if there is a large amount of sediment on the weir after the dam is toppled, the shutoff valve 25 is closed and the water supply device 8 is operated to remove it. Note that dust and dirt are prevented from entering the equipment room 3 by a shielding plate 19 and by a mud shielding plate 20.

(Effects) If the device of the present invention is used in this way, regardless of changes in the water level of the river downstream of the weir, it will automatically be completely collapsed during floods, and will be ready to stand when the water is low, and no machinery is required for the lodging mechanism. Since it does not use a mechanical mechanism, there is no failure and it is extremely safe.

[Brief explanation of drawings]

FIG. 1 is an overall plan view showing an embodiment, and FIG. 2 is a schematic diagram of a device for operating a weir body. 1~Weir body, 2~Fixing metal fittings, 3~Equipment room, 4~Siphon, 4-a~Water port, 4-b~Drain port, 5
- Water pipe, 6 - Water pipe, 7 - Machine room, 8 - Water supply device, 9 - Drain pipe, 9-a - Outlet, 10 - Water distribution pipe, 11 - Breaker, 12 - Intake pipe, 13 - Ventilation frame, 13-a - Ventilation membrane, 14 - Control tank, 15 - Air guide pipe, 16 - Inspection valve, 17 - Water pipe, 18 -
U-shaped pipe, 19~shielding plate, 20~mud shielding plate, 20-a
- Water introduction hole, 21 - saucer, 22 - saucer, 23 - shielding dish, 24 - artificial water discharge valve, 25 - cutoff valve.

Claims (1)

[Scope of Claims] 1. An operating device for undulating a flexible bag-like undulating weir installed across the entire width of a river, comprising: A pump connected to the weir body, an equipment room opened to the river upstream of the weir body, and a crest provided in the equipment room, one end communicating with the inside of the weir body, and located at a position higher than the predicted maximum water pressure inside the weir body. The other end is connected to the main siphon device whose other end opens to the downstream river at the level of the downstream river, and the downstream side from near the crest of the main siphon device is connected via a communicating pipe, so that the river water level upstream of the weir automatically collapses. and an intake device that sucks and discharges air in the main siphon device after reaching the water level, and operates the main siphon by creating a negative pressure in the main siphon device after reaching the automatic collapse water level. An operating device for a water-type bag weir characterized by: 2. In the operating device for a water-type bag weir according to claim 1, the intake device is arranged such that the other end of the communication pipe opens near the crest, and one end is located at a higher position than the opening of the main siphon. In the equipment room, there is a secondary siphon device whose other end opens to the downstream river side, a control tank provided in the equipment room that communicates with the atmosphere, and a control tank that is branched from the middle of the communication pipe and opens at the rising water level in the control tank. 1. An operating device for a water-type bag-shaped weir, characterized in that it is comprised of an air intake pipe, and a water guide pipe that branches from an automatic collapse water level in the middle of the air intake pipe and opens into an equipment room.