JPS5929728B2 - How to eliminate air supply and exhaust and condensation in a rubber-coated undulating weir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the supply and discharge of air to be filled into the bag body of the undulating weir and the inside of the bag body at an undulating weir made of rubber-coated cloth installed in a river channel in order to take water from a river. This relates to a method for discharging condensation that occurs.

Traditionally, when collecting water for agricultural use from a river, the water level is raised using a fixed or movable weir installed across the river channel. This increases the destructive force and causes the levee to break, and the levee breach may cause flooding within the levee, resulting in accidents such as the weir being washed away.

Therefore, in recent years, the digging method for sea channels has been adopted, and movable weirs are increasingly being adopted in place of fixed weirs to avoid creating obstacles in river channels during floods.

There are two types of movable weirs: the iron door type and the undulating weir made of rubber-coated cloth, but in recent years, due to construction costs and maintenance costs, intake weirs,
Relief weirs made of rubber-coated fabric have come to be widely used for tide protection weirs, dams, power generation layers, etc.

This undulating weir made of rubber-coated cloth has a bag body (gate) made of synthetic rubber-coated cloth installed across the seaway, and water or air is pressurized into this bag body, and it is raised to form a weir and a dam is formed on the upstream side. However, when the water level rises abnormally, the bag is flattened by discharging the air inside to smooth the water flow, and these lifting operations can be performed manually or automatically.

Most of the recently installed undulating weirs adopt a pneumatic type as the medium, and the dam water level detection port opened on the upstream side of the dam and the piping that follows it cross the embankment, and the lower part of the control room installed on the embankment. When the river reaches the planned water level due to rain, etc., the weight of the overflow water received by the float or packet activates the supply/exhaust valve to collapse the bag in the layer. It has become.

Further, these supply and exhaust valves are operated by electric power, mechanical power, manual power, etc., and air accumulated in a separately provided accumulation rake or air tank is used as the power source for these.

Furthermore, conventionally, the supply and exhaust pipes connected to the bag body as described above cross the embankment, so they needed to be completely watertight from a flood control perspective, and the pipes needed to be protected by wrapping with concrete etc. to stop water. In addition, in order to drain water droplets due to condensation that occurs inside the bag, the drain pipe provided below the bag should be allowed to flow down naturally into the pit at the bottom of the operation room, as described above, and the water droplets should be pumped up using the power of a pump, etc. Since these pipes are discharged to the outside, a large amount of civil engineering costs are required, such as digging and breaking embankments for these pipes, and other power sources such as pumps are required for drainage.In addition, during maintenance management, ramps are used to access the control room from the control room. There is a risk of injury and other accidents due to the movement up and down into the pit at the bottom, and from economic and handling considerations, models without a lower structure for the control room have become required.

Therefore, in a pneumatic relief weir, the present invention utilizes the bag of the weir as an air tank, and the supply/exhaust pipes and condensation discharge device are installed in a pit outside the embankment on the revetment without crossing the embankment. This eliminates the lower structure of the control room and automatically drains condensation inside the bag using the air pressure inside the bag, simplifying the operation of raising and lowering the bag, reducing construction costs, and reducing accidents. The purpose is to prevent

Next, one embodiment of the apparatus according to the present invention will be described with reference to the drawings.

As shown in Figures 1 and 2, it crosses the seaway 1 and extends over the seawalls 2 on both sides, and has twin tube spacers 3 inside.
The bottom of the bag body 5 of the undulating weir 4 made of rubber-coated cloth is fixed with the mounting bracket I on the floor stop work 6 of the seaway 1, and air is supplied and discharged to and from the bag body 5 through the main pipe 8 for supply and exhaust. This air is sucked and pressurized by a rotary blower 12 through a strainer 11 with a suction silencer by the operation of an electric motor 10 in an operation chamber 9 provided in the embankment, and is then pressurized by an overpressure prevention safety valve 13.
Air is supplied to the bag body 5 through a check valve 14, an air supply valve 15, etc., and a manual exhaust valve 1 is connected to an exhaust pipe 8a branching from the middle of the main pipe 8.
In the undulating weir 4 provided with The upper air supply and exhaust ports 19 provided at both ends of the upper part of the bag body 5 are opened, and the lower ends of the bag body 5 are connected to condensation drain pipes 20 which also serve as air supply and exhaust. The lower air supply/exhaust port 21 is opened.

Furthermore, in the above-mentioned outer pit 18, a check valve 22 is provided in the middle of the main pipe 8 so as to communicate only in the direction of the bag body 5, and a branch pipe 8c branched from the check valve 22 near the automatic exhaust valve 17 is connected to the branch pipe 8c. , air/water separation cyclone 2
3 and a water seal type pressure safety device 24 having a tank 24a at the bottom thereof, and further the air/water separation cyclone 23,
An air injector 25 (see FIG. 3) is interposed so as to communicate the main pipe 8 between the check valve 22 and the upper supply/exhaust port 19, and the drain pipe 2 is connected to the negative pressure side of the air injector 25.
The upper end of 0 is opened for connection, and this drain pipe 2
A drain recovery tank 26 is provided in the middle of the drain.

This drain recovery tank 26 includes a strainer 27 installed at the bottom as shown in FIG.
8 and a water pipe 29 connecting the pipes 8 and 8.

Further, a float 32 is provided on the upright portion of the detection tube 31 connected to the dam water level detection port 30 provided on the upstream side of the dam, and an automatic lodging pilot valve 33 is actuated by the elevation of the float 32. It communicates with the automatic exhaust valve 17, and when the water level rises abnormally during a flood, the automatic exhaust valve 17 is activated and the air in the bag body 5 is discharged from an exhaust pipe 8a branched from the main pipe 8.

According to the present invention configured as described above, in order to supply air to the bag body 5 of the undulating weir 4 and make it erect, an electric motor 10 provided in the operation room 9 is operated to operate a strainer provided in the main pipe 8 for supply and exhaust. The air sucked from the rotary blower 12
, overpressure prevention safety valve 13, check valve 14, and air supply valve 15,
Furthermore, air is supplied to the bag body 5 from the upper air supply/exhaust port 19 via the check valve 22 provided in the pit 18 outside the embankment, and from the branch pipe 8c branched from the main pipe 8, passes through the air/water separation cyclone 23 and then to the lower drain pipe 20. Air is also supplied into the bag body 5 from the lower air supply/exhaust port 21 connected to the bag body 5 to make the bag body 5 stand up, and a dam is formed on the upstream side of the bag body 5 to store water.

In addition, due to water increase due to rainfall, etc., the water level of Kaido 1 has been reduced to the planned water level S.
When the water level reaches WL, the float 32 installed in the detection tube 31 rises due to the introduction of water from the dam water level detection port 30 provided on the upstream side of the seaway, and the automatic lodging pilot valve 33 connected to this is activated to automatically lower the water level. By opening the exhaust valve 17 and discharging the air inside the bag body 5 to the outside from the exhaust pipe 8a through the main pipe 8 and the drain pipe 20, the bag body 5 is collapsed, thereby eliminating obstacles on the seaway 1 and making the river flow smoothly. Let it flow down.

In addition, at the same time as the bag body 5 falls down, the exhaust force generated by the water head pressure is used to spray condensation generated inside the bag body 5 and accumulated in the drain recovery tank 26 from the drain pipe 20 below from the spray injector 28. The air is sucked through the strainer 27 and the water pipe 29 to form a mist, and the mist air is sucked through the air injector 25 provided at the upper end of the drain pipe 20 by the exhaust ejected from the main pipe 8. The air is then sent to the steam/water separation cyclone 23 to separate moisture, and one of the air is discharged from the branch pipe 8c through the main pipe 8 to the exhaust pipe 8a, and the other moisture is sent to the tank 24a of the pressure safety device 24 below. It is used as replenishment water.

In addition, when it is desired to remove condensation inside the bag body 5 during normal times, the air in the main pipe 8 is discharged by operating the manual exhaust valve 16, and the air is discharged from the air injector 25 installed in the middle (at this time, the air is discharged in the reverse direction). (The stop valve 22 prevents further exhaustion.) In the same manner as described above, atomized condensation is sucked from the drain pipe 20, and moisture is separated and removed by the steam/water separation cyclone 23.

As explained above, the present invention provides that the main operating equipment of the undulating weir is installed in the operation room inside the embankment, and furthermore, an outside pit is provided at the top of the revetment within a predetermined cross section of the embankment, and the supply and exhaust pipes to the bag body are installed in this pit. Since most of the dam water level detection pipes, bag condensation removal equipment, etc. were installed in piping, these pipings did not cross the embankment as in conventional structures, and this meant that there was no need for excavations or sheet piles for construction work. This eliminates the need for construction costs, and prevents accidents such as the destruction of embankments during floods, making it safer in terms of flood control and management.Furthermore, when draining condensation inside the bag, the bag can be used as an air tank. This air is used to automatically turn the condensation into a mist, and the moisture is separated and removed by the air-water separation cyclone, which eliminates the need for the μ-hole lower structure of the pit in the operation room and the pump pump, as in the conventional structure. Equipment etc. become uncomfortable, and therefore the cost of digging and constructing pits within the embankment can be significantly reduced, maintenance management of these is also unnecessary, and accidents resulting in injury are eliminated.

In addition, the dam water level pipe can be shortened, and the supply and exhaust pipes are only a main pipe and a pilot pipe, which reduces piping construction costs and is economical.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an explanatory diagram of a undulating weir and a undulating device, and Fig. 2 is an enlarged cross-sectional view of the bag, with A in the figure standing up and the mouth in the figure lying down. FIG. 3 is an enlarged sectional view of the main parts of the drain recovery tank and the air injector. 1... Kaido, 2... Seawall, 3...
・・Twin tube spacer, 4・・・・undulating weir,
5... Bag body, 6... Floor stop, 7...
...Mounting bracket, 8...Main pipe, 8a...
・Exhaust pipe, 8b... Bypass pipe, 8C...
... Branch pipe, 9 ... Control room, 10 ... Electric motor, 11 ... Strainer, 12 ...
Rotary blower, 13...Egress prevention safety valve, 1
4... Check valve, 15... Air supply valve, 16
...Manual exhaust valve, 17...Medium moving exhaust valve,
18... Pit outside the embankment, 19... Upper supply/exhaust port, 20... Drain pipe, 21... Lower supply/exhaust port, 22... Check valve, 23...
Air/water separation cyclone, 24... Water seal pressure safety device, 24a... Tank, 25... Air injector, 26... Drain recovery tank, 2
7...Strainer, 28...Spray injection, 29...Water pipe, 30...Dam water level detection port, 31...Detection tube , 32...
...Float, 33...Automatic lodging pilot valve, 34...Pilot pipe, SWL...
Planned lodging water level.

Claims (1)

[Claims] 1. In an undulating weir installed on a seaway and equipped with a rubber-coated cloth bag that is raised and lowered by supplying and discharging air, a pilot diaphragm automatic exhaust valve is installed in a bypass pipe midway through the main pipe that supplies and discharges air to the bag. This pilot diaphragm type automatic exhaust valve is connected by an air pipe to an automatic lodging pilot valve operated by a float installed in a dam water level detection pipe opened upstream of the river, and the water level of the river reaches the planned lodging water level. When this occurs, the air inside the bag is automatically removed and the bag is collapsed, and a reverse valve is installed in the middle of the main pipe, and an internal strainer and sprayer are installed in the middle of the drain pipe for condensation generated inside the bag. A drain recovery tank with an insector is installed, and the atomized air water generated in the drain pipe is sucked in by the air insector installed in the middle of the main pipe and sent to the air-water separation cyclone to separate air and water. , the moisture is discharged by flowing down into the tank of the water seal type pressure safety device below, and the mechanism for collapsing the bag and removing condensation is installed in an outside embankment bit formed outside the embankment. Method of supply/exhaust and fog elimination in rubber-coated undulating weir.