JP3069534B2 - Rubber gate safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an up-and-down weir made of a bag made of a flexible rubber film defining an upstream side and a downstream side of a river or the like, that is, a rubber gate capable of easily adjusting a weir height. The present invention relates to a safety device for preventing overcharging of a bag body and coping with overpressure on the bag body.

[0002]

2. Description of the Related Art For the purpose of taking in agricultural water, blocking seawater at river mouths, etc., there is a rubber gate which is arranged so as to cross a river and is fixed to a river bed. The rubber gate increases the weir height by filling and expanding a fluid such as air into the bag body, or contracts by discharging the fluid to lower the weir height.

An example of this kind of prior art is described with reference to FIG. 3, in which a blower (air supply device) 51 is connected to a bag body 53 via an open / close valve 58 by a supply / exhaust pipe 52. And
The air is supplied / discharged by operating the blower 51 and opening / closing the opening / closing valves (58 and 58a) to expand or contract the bag 53, thereby raising and lowering the bag 53, that is, the weir.

A branch pipe 54 branches off from the supply / exhaust pipe 52 to reach a water tank 55. Then, from the blower 51 to the bag 5
When air is supplied to the branch pipe 3, the pressure in the bag 53 is acting on the branch pipe 54. Therefore, as long as the pressure in the bag 53 is equal to or less than the pressure corresponding to the length of submerged pipe 54, the blower 51 Then, air is supplied to the bag 53, and the bag 53 continues to expand.
The air pressure in the bag 53 acts on the branch pipe 54 to lower the water level of the branch pipe 54. Then, when the water level falls, the air in the supply / exhaust pipe 52 escapes from the discharge port 56 through the branch pipe 54 and is discharged into the water tank 55, and the inside of the bag 53 is maintained at a constant pressure, and the bag 53 To prevent overcharging.

When an overpressure is applied to the bag 53 by heat or water pressure, air is discharged from the air supply / exhaust pipe 52 through the branch pipe 54 to the outlet 56, and the pressure of the bag 53 is kept constant. In this case, the bag 53 is prevented from being damaged by overpressure. That is, the branch pipe 54 and the water tank 55 constitute a safety device 57.

The prior art having a safety device for preventing overcharging and overpressure is disclosed in Japanese Patent Application Laid-Open No. 57-19081.
No. 6, “Overpressure prevention device for flexible membrane weir”, Japanese Patent Publication No. 62-
It is also disclosed in, for example, US Pat.

[0007]

However, in the prior art, even if it is possible to prevent supercharging and overpressure,
It does not have the function of automatically lowering the rubber gate against excessive overpressure. Japanese Patent Application Laid-Open No. 57-190816 and Japanese Patent Publication No. 62-9692 also disclose means for preventing supercharging and overpressure, but have a structure in which two or more devices are required. It was complicated and took up space.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a safety device for a rubber gate which has both a function of preventing overcharging and an automatic falling function by overpressure with a simple device. To provide.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a safety device for a rubber gate connected between a blower and a bag, comprising a water tank and a vertical wall inside the water tank. An overpressure exhaust pipe provided, an overpressure prevention pipe connected to the overpressure exhaust pipe in the water tank and opened to the atmosphere, and an overpressure prevention pipe connected above the connection point of the overpressure prevention pipe with the overpressure exhaust pipe. And a branch pipe connected to the overpressure exhaust pipe which branches off from a supply / exhaust pipe extending from the blower to the bag body and can be opened in the water tank and provided with an on-off valve in the middle. It is characterized by.

Further, it is desirable to provide a conduit for communicating the water tank erected the over-retraction trachea rivers and internal weir upstream.

When the pressure in the bag reaches a predetermined pressure equal to or higher than the atmospheric pressure when the bag is inflated, air acts on the overpressure exhaust pipe from the supply / exhaust pipe via the branch pipe to lower the water level. When the air pressure is lowered to the mounting portion of the supercharge prevention pipe, the air is discharged into the water tank through the branch pipe, the overpressure exhaust pipe, and the supercharge prevention pipe, thereby preventing the supercharge of the bag body. Also, if excessive overpressure acts on the bag when the bag is raised, the water level of the overpressure exhaust pipe drops to the mounting part of the overpressure prevention pipe, and the air in the bag is released from the branch pipe, overpressure exhaust pipe, and overpressure. The air is released to the atmosphere through the prevention pipe, the air is continuously exhausted, and the bag completely falls down.

[0012]

An embodiment of the present invention will be described with reference to FIG.

An on-off valve 2 for controlling air supply from a blower 1;
And an on-off valve 2 for exhausting to the atmosphere when the bag body 3 falls down
A supply / exhaust pipe 4 is connected to a rubber bag 3 disposed so as to cross a river or the like via a.

The safety device 5 according to the present embodiment includes a water tank 6,
An overpressure exhaust pipe 7, an overpressure prevention pipe 8, a supercharging prevention pipe 9,
A branch pipe 10 branched from a supply / exhaust pipe 4 extending from the blower 1 to the bag body 3.

A vertically long overpressure exhaust pipe 7 is provided upright on the inner bottom wall of the water tank 6 having an open upper surface. The overpressure exhaust pipe 7 is fixed to the bottom wall of the water tank 6 in a liquid-tight and air-tight manner.
The upper end surface is closed. Further, the water tank 6 is communicated with the river on the upstream side of the weir by the water pipe 11.
The water level of the water tank 6 is the same as the water level of the river, or becomes the same as the bottom of the water pipe 11 and becomes constant when the water level of the river falls.

An overpressure prevention pipe 8 is attached to the bottom of the overpressure exhaust pipe 7. This overpressure prevention pipe 8 is an overpressure exhaust pipe 7.
It extends upward in parallel with and is open to the atmosphere.

The overpressure exhaust pipe 7 of the overpressure prevention pipe 8
The supercharging prevention pipe 9 is attached at a position above the attachment point of the above. The supercharging prevention pipe 9 has an opening / closing valve 12 on the way and can be opened into the water tank 6.

It is preferable that the inner diameter of the overpressure prevention pipe 8 and the inner diameter of the overpressure exhaust pipe 9 be the same in order to make the exhaust amount the same.

The mounting position of the supercharging prevention pipe 9 to the overpressure exhaust pipe 7 is 50 m longer than the mounting position of the overpressure prevention pipe 8.
It is preferable that the mounting be made higher than the larger one of m and the inner diameter of the overpressure prevention pipe 8 or the overpressure exhaust pipe 9. When exhausting from the supercharge prevention pipe 9, the water level of the overpressure exhaust pipe 7 drops to the center of the supercharge prevention pipe 9 and moves up and down, so that the supercharge prevention pipe 9 and the overpressure prevention pipe 8 are attached. If the height difference is small, the air is exhausted from the overpressure prevention pipe 8 and the bag body 3 may fall down automatically.

A branch pipe 10 branched from a supply / exhaust pipe 4 extending from the blower 1 to the bag body 3 is connected to an upper portion of the overpressure exhaust pipe 7.

The present embodiment configured as described above is as follows. In a state where the on-off valve 2 a is opened without operating the blower 1, the bag body 3 is lying down. At this time, the internal pressure of the bag body 3 is at the atmospheric pressure. The water in 6 flows into the overpressure exhaust pipe 7 via the supercharged prevention pipe 9, and the water level in the water tank 6 and the water level in the overpressure exhaust pipe 7 are at the same level. When the bag 3 is inflated and raised, the open / close valve 2 of the supply / exhaust pipe 4 is opened.
By closing the valve a, opening the on-off valve 12 of the supercharge prevention pipe 9 and operating the blower 1, the bag 3 is gradually expanded.

When the bag body 3 is inflated and rises to a predetermined pressure higher than the atmospheric pressure, air acts on the overpressure exhaust pipe 7 from the supply / exhaust pipe 4 via the branch pipe 10 to lower its water level. Let it. When the water level drops to the mounting portion of the supercharge prevention pipe 9, air is discharged into the water tank through the branch pipe 10, the overpressure exhaust pipe 7, and the supercharge prevention pipe 9, and the pressure of the bag body 3 decreases. A constant pressure is maintained to prevent overcharging of the bag 3. Then, the operation of the blower 1 is terminated, and the on-off valve 12 is closed.

Further, when excessive pressure is applied to the bag body 3 due to concentrated torrential rain or heat when the bag body 3 stands, the water level of the overpressure exhaust pipe 7 further decreases to the mounting portion of the overpressure prevention pipe 8, The air in the bag body 3 is discharged into the atmosphere through the branch pipe 10, the overpressure exhaust pipe 7, and the overpressure prevention pipe 8, and the air is continuously exhausted.
The bag 3 completely falls down.

As described above, the present embodiment not only prevents overcharging of the bag body 3 but also prevents excessive pressure from being applied to the bag body 3.
In addition, it has the function of completely falling down.

In this embodiment, the water level of the water tank 6 is the same as that of the river by the water pipe 11, but when the water level of the river falls, it becomes the same as the bottom of the water pipe 11 and becomes constant. Thereby, the set pressure at the time of air supply when the water level of the river is low can be set as low as about 65 to 70% of the pressure at the time of storage. That is, when the pressure in the standard water storage state in the rubber gate weir is equivalent to the water column of the gate height, when the upstream water level is absent or sufficiently low, the internal pressure of the bag body 3 at the time of air supply is lower than the internal pressure during the water supply. If the water level rises to a water storage state when the water level rises to about 65 to 70%, the bag body 3 is pressed by the water flow, so that the internal pressure increases to 100% and reaches a specified value (standard water storage state). is there.

The internal pressure of the bag 3 at the time of air supply is 65-70.
The following method is used to set it to about%. Normally, when the rubber gate is lying down, the water level is low and below the bottom surface of the water pipe 11. Therefore, the water in the water tank 6 flows out of the water pipe 11 into the river, and the water level is kept constant at the bottom of the water pipe 11.
When air is supplied to the bag body 3 by the blower 1, the overpressure exhaust pipe 7
The water level inside is lowered, and the water is exhausted from the supercharge prevention pipe 9 into the water tank 6. In this case, the air pressure in the overpressure exhaust pipe 7
When the pressure exceeds the pressure equivalent to the water column at the distance (depth) between the water level and the supercharged prevention pipe 9, the gas is exhausted. Therefore, the distance (water depth)
Use to determine the set pressure.

On the other hand, when the water level of the river is higher than the bottom of the water pipe 11, the water level in the water tank 6 is at the same level as the water level of the river. When air is supplied at this time, the distance (water depth) between the water level of the water tank 6 and the supercharged prevention pipe 9 is increased, and a pressure of 70% or more is applied.

Next, a different embodiment will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals.

The safety device 5 according to this embodiment also includes a water tank 6
, An overpressure exhaust pipe 7, an overpressure prevention pipe 8, and a supercharging prevention pipe 9
And a branch pipe 10 branched from a supply / exhaust pipe 4 extending from the blower 1 to the bag body 3. The configuration and operation thereof are exactly the same as those of the above-described embodiment, and therefore description thereof is omitted.

However, the water pipe 11 utilizing the river water level is not provided, and the structure is independent.

[0031]

As is apparent from the above description, since the difference in water level is used, it is possible to reliably prevent supercharging when the bag is raised, and also to prevent excessive charging of the bag. It also has the function of automatically and automatically falling down against pressure, and provides an unprecedented safety device. Therefore, even if excessive pressure is applied when the bag is raised, there is no fear that the rubber gate will be damaged.

In particular, since the present invention has one of the above-described effects in one device, the function of preventing supercharging is also provided.
It has a simple structure and does not take up much space.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blower 2 On-off valve 2a On-off valve 3 Bag 4 Supply / exhaust pipe 5 Safety device 6 Water tank 7 Overpressure exhaust pipe 8 Overpressure prevention pipe 9 Supercharge prevention pipe 10 Branch pipe 11 Water guide pipe 12 On / off valve 13 River upstream of weir 14 River downstream of the weir 51 Blower 52 Supply / exhaust pipe 53 Bag body 54 Branch pipe 55 Water tank 56 Outlet 57 Safety device 58 On-off valve 58a On-off valve

Continuation of the front page (56) References JP-A-57-190816 (JP, A) JP-A-3-76169 (JP, A) JP-A-55-81918 (JP, A) JP-A-48-107225 (JP) , U) Japanese Utility Model Showa 59-43522 (JP, U) Japanese Patent Publication No. 62-9962 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02B 7/20 103

Claims (2)

(57) [Claims] 1. A safety device for a rubber gate connected between a blower and a bag, comprising a water tank, an overpressure exhaust pipe erected on a bottom wall inside the water tank, and a water tank attached to the overpressure exhaust pipe. An overpressure prevention pipe which is connected inside and opened to the atmosphere, and which is connected above a connection point of the overpressure prevention pipe with the overpressure exhaust pipe and which can be opened into the water tank and provided with an on-off valve on the way. A safety device for a rubber gate, comprising: a supercharging prevention pipe; and a branch pipe branched from a supply / exhaust pipe extending from the blower to the bag body and connected to the overpressure exhaust pipe. 2. The overpressure exhaust pipe in a river upstream of a weir and inside the weir.
The safety device for a rubber gate according to claim 1, further comprising a water guide pipe communicating with a water tank in which the water tank is provided upright .