JPH0427005A - Watertight device of gate - Google Patents

Abstract

PURPOSE:To stably control the watertight device of gate by a method in which a main pump is operated, a watertight rubber is pressurized through an antifreezing liquid supply tube to press it on gate, a subpump is operated, and the watertight rubber is further pressed through an antifreezing liquid introducing tube and a water-pressure cylinder. CONSTITUTION:When the lowering of a gate is stopped, a main pump 13 is operated, and antifreezing liquid in a storage tank 10 is supplied to a watertight rubber 4 and the lower chamber (b) of a water-pressure cylinder 20 through a supply tube 11. When the rod 23 of the cylinder 20 comes into contact with a stopper 23' and the pressure of the antifreezing liquid is equalized with the static water pressure of dam head, the main pump is stopped. The subpump 28 is then operated to introduce antifreezing liquid into the upper chamber (a) of the cylinder 20 through an antifreezing liquid introducing tube 25. The antifreezing liquid in the lower chamber (b) of an area ratio of 1/10-1/20 is supplied through a communicating tube 24 and the supply tube 11 into the rubber 4 and orderly pressurized to press the rubber 4 on the gate. Fine control can thus be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a watertight device for a gate provided in a water pipe of a dam or the like.

[Conventional technology j The conventional watertight rubber crimping device has a dam 1 as shown in Fig. 3.
A main gate 3 such as a radial gate installed in the water pipe 2 of
and an annular watertight rubber 4 provided on the inner peripheral surface of the water conduit 2 and press-fitting the entire front circumference of the gate 3 in the closed state. is introduced to pressurize the antifreeze liquid filled in the watertight rubber 4, and at the same time, the antifreeze liquid is further pressurized by a separately provided pump to advance the watertight rubber 4, thereby creating a pressure force greater than the water pressure of the dam 1. It is known that the gate 3 is maintained watertight by acting on the gate 3.

However, in the case of this device, the pump simply sends a certain amount of clean water into the watertight rubber 4 to pressurize the antifreeze liquid extra, so the pressing force of the watertight rubber 4, that is, the pressure force of the gate 3, is adjusted to the desired value. It is not always possible to maintain In other words, it is impossible for JO to act as an oppressor in small units.

This means that the maximum water head of the dam is around 100m, which is equivalent to 10 when converted to water pressure! J/ctA, and the pressing force of the watertight rubber 4 at this time is slightly higher than the water pressure 12 to 13.
KM~ is set. The reason why this pressurizing force is finely controlled by the pump from the low water head to the above-mentioned water head is based on the characteristics of the pump.

Therefore, as an improvement to this, JP-A-62-24
2005 @ Publication can be mentioned.

This watertight device contains antifreeze fluid that is crimped onto a closed gate and is sent into the watertight rubber to pressurize it, and air to pressurize the antifreeze fluid that pressurizes the antifreeze fluid and sends it into the watertight rubber. It has an airtight pressure tank and an air reservoir, and is equipped with an air supply means for supplying air from the air reservoir into the airtight pressure tank to pressurize the antifreeze liquid, and an air discharge means for discharging air from the airtight pressure tank. is.

Since this method pressurizes the antifreeze liquid using air pressurizing means, it has the advantage of allowing fine control of the watertight rubber.

[Problems to be Solved by the Invention] However, since there is no separation wall between the antifreeze in the airtight pressure tank and the air introduced to pressurize it, air may mix into the antifreeze. Therefore, there is a problem that the control becomes unstable (irregular), and for example, it is difficult to set it at a predetermined position, and the reliability of the current step control is lacking.

The present invention has been made in order to improve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a watertight device for a gate that enables stable control and fine control by employing hydraulic pressure means. That is.

[Means for Solving the Problems 1] The gate watertight device of the present invention includes a gate provided in a dam,
The watertight rubber is compressed through a liquid pressurizing means, and the liquid pressurizing means connects the back of the watertight rubber and an antifreeze storage tank via an antifreeze supply pipe equipped with a main pump. , connected to the antifreeze storage tank via an antifreeze discharge pipe equipped with a first switching valve, and connected to the antifreeze supply pipe with a first cylinder.
Connecting the lower chamber formed by the piston fitted in the nonda and the lower chamber of the hydraulic cylinder consisting of the lower chamber, further connecting the lower chamber to the antifreeze storage tank, and an antifreeze inlet pipe equipped with a sub-pump and a second switching valve. The rod of the piston is connected to the outside of the cylinder (projects out), a stopper is provided at the projecting end, and the area ratio of the upper chamber to the lower part is 10:1 to 2o:1. It consists of the following.

[Action 1: When the gate descends from the open state and stops, the first
The switching valve is closed, the second switching valve is switched to the discharge side, the main motor is started, and the main pump is operated.

Then, antifreeze from the antifreeze storage tank is supplied to the back of the watertight rubber via the antifreeze supply pipe. Furthermore, this antifreeze fluid is also supplied to the lower chamber of the hydraulic cylinder via the antifreeze fluid communication pipe. As a result, the piston rises together with the rod, but when it rises by a certain amount, the stopper hits the cylinder and stops, and it does not rise any further.Continuing, the main pump operates to supply antifreeze to the watertight rubber, making it watertight. The rubber is pressurized and expanded, and this expansion pressurizes the watertight rubber and moves it forward, crimping the gate. The main pump stops operating when the pressure reaches approximately the same level as the hydrostatic pressure caused by the dam's water head. Then, the second switching valve closes, the auxiliary motor starts, the auxiliary pump operates, and the antifreeze in the tank is introduced into the upper chamber of the hydraulic cylinder. Then, the amount of water stored in the upper chamber increases, and when the water pressure relative to the stored amount becomes greater than the water pressure in the lower chamber, the hydraulic cylinder begins to descend, and the antifreeze in the lower chamber passes through the antifreeze communication pipe → the antifreeze supply pipe and becomes watertight. Supplied to rubber.

Therefore, by supplying the antifreeze in the lower chamber to the back of the watertight rubber, the watertight rubber is sequentially pressurized, and as a result, the watertight rubber expands and moves forward to press the gate.

Then, when this pressing force increases by a predetermined pressure from the water pressure relative to the water head of the dam, the sub pump stops.

As a result, the antifreeze in the watertight rubber is confined in a pressurized state by the closing of the first switching valve and the action of the reverse valve, and the watertight rubber is pressed by a predetermined engraving and moves forward. In turn, it is crimped to the gate with appropriate pressure to maintain watertightness.

Furthermore, the hydraulic cylinder has an area ratio of the upper chamber and lower chamber of 1.
Since 0=1 to 20:1, the actual pressure in the lower chamber is increased in small units with respect to the actual pressure on the main pump side. This makes it easy to control the pressure on the watertight rubber by increasing or decreasing the water head of the dam.

To change the gate from the closed state to the open state, the first and second switching valves are opened. As a result, the antifreeze in the back of the watertight rubber returns to the tank via the antifreeze supply pipe → antifreeze discharge pipe, and the antifreeze in the upper chamber also returns to the tank via the antifreeze discharge pipe. Therefore, the pressure of the watertight rubber is released and the pressure becomes zero, and the frictional force of the watertight rubber when the gate is opened becomes small, making it easier to open and close the gate.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

The basic structure shown in FIG. 3 is the same, so the explanation will be omitted. 1 and 2, reference numeral 10 denotes an antifreeze storage tank, and this tank is connected to an engraved/shrinkable tube 5 provided on the back of the watertight rubber 4 described above via an antifreeze supply pipe 11.

A main motor 12 is connected to the antifreeze supply pipe 11 from the tank 10 side.
A main pump 13 and a check valve 14 are provided which are operated by.

Reference numeral 15 denotes an antifreeze discharge pipe having a first switching valve 16 branched from the antifreeze supply pipe 11 and connected to the tank 10 at the other end.

Reference numeral 20 denotes a cylindrical hydraulic cylinder disposed vertically, and a piston 22 is fitted into a cylindrical cylinder 21 disposed vertically, and a rod 23 of the piston 22 penetrates the cylinder 21 and projects downward. A stopper 23- for regulating the amount of rise of the rod 23 is provided at its lower end.

Therefore, the hydraulic cylinder 20 is divided into an upper chamber a and a lower chamber by the piston 22, and the lower chamber is divided into an antifreeze supply pipe 11.
are connected through the antifreeze communication pipe 24.

Further, an antifreeze inlet pipe 25 for introducing antifreeze from the tank 10 and an antifreeze outlet pipe 26 for returning antifreeze from the upper part 'la to the tank 10 are connected to the upper chamber a of the hydraulic cylinder 20.

Then, the area ratio of the upper chamber a and the lower chamber A is set to 10:1 to 20.
:1, and the cylinder length of the upper part a is set to 5 to 10 m.

An auxiliary pump 28 operated by an auxiliary motor 27 is interposed in the antifreeze inlet pipe 25, and a second switching valve 29 is provided in the antifreeze outlet pipe 26.

Reference numeral 30 denotes a pressure detector connected to the antifreeze fluid communication pipe 24, and the results detected by this detector are inputted to a computer 32 via a control panel 31. In addition, the control panel 31
The water head of the dam 1 is detected by a water level gauge 33, and the result is inputted.

34 is a drive control unit C that inputs signals from the control panel 31, and this control unit issues drive commands to the main and sub motors 12 and 27;
A switching command is issued to the first and second switching valves 16.29.

By the way, 35 is a relief valve and 36 is a pressure gauge.

Next, the operation of the embodiment will be explained.

When the gate 3 is open, the switching valves 16 and 29 are open, and the water pressure in the tube 5 is almost zero because it communicates with the tank 10 via the antifreeze supply pipe 11 and the antifreeze discharge pipe 15. be. However, since the tank 10 is installed above the position of the watertight rubber 4, pressure is generated within the tube 5 by the amount of water head, but the pressure is very small.

When the gate 3 descends and stops from the above state, a command is issued from the control unit 34 in response to a stop signal from the gate 3, and the switching valve 16 is closed and the switching valve 29 is switched to the discharge side (right side in the figure). Then, the main motor 12 starts and the main pump 1
3 works. Then, antifreeze from the antifreeze storage tank 10 is supplied into the tube 5 via the antifreeze supply pipe 11. Furthermore, this antifreeze is also supplied to the lower part ib of the hydraulic cylinder 20 through the antifreeze fluid communication pipe 24, whereby the piston 22 rises together with the rod 23, but when it rises by a predetermined amount, the stopper 23' is stopped by the cylinder 2199. And it won't go up any higher.

Subsequently, when antifreeze is supplied to the tube 5 by the operation of the main pump 13, the tube 5 is pressurized and engraved, and due to this engraving, the watertight rubber 4 is pressurized and moves forward to press the gate 3. The operation of the main pump 13 stops when the pressure becomes approximately the same as the hydrostatic pressure due to the water head of the dam 1. Then, the switching valve 29 is closed, the auxiliary motor 27 is started, the auxiliary pump 28 is operated, and the antifreeze in the tank 10 is introduced into the upper chamber a of the hydraulic cylinder 20. Then, the amount of water stored in the lower chamber a increases, and when the water pressure relative to the stored amount becomes greater than the water pressure in the lower chamber, the piston 22 begins to descend, and the antifreeze in the lower part ib flows from the antifreeze communication pipe 24 to the antifreeze supply pipe. 11 into the tube 5.

At this time, the antifreeze is supplied to the tank 10 through the antifreeze supply pipe 11.
However, the check valve 14 prevents the flow from flowing backwards.

Therefore, by supplying the antifreeze in the lower chamber to the back of the watertight rubber 4, the watertight rubber 4 is sequentially pressurized, and as a result, the watertight rubber 4 engraves and moves forward to press the skin plate of the gate 3.

Then, when this pressing force is increased by a predetermined pressure from the water pressure relative to the water head of the dam 1, the sub pump 28 is stopped.

That is, the pressurized state of the tube 5 is detected by the pressure detector 3Q, and the detected value is converted into an electrical signal and sent to the control panel 31.
and Zara (input to computer 32).

On the other hand, the water head of the dam 1 is detected by the water level gauge 33, and the water pressure due to this water head is converted into an electrical signal and inputted to the control panel 31, and further inputted to the computer 32.

Here, since the pressurizing force (target value) of the watertight rubber 4 corresponding to this water pressure is set and stored in the computer 32, this target value and the detected value are compared and calculated, and when both values match, the computer 32 32-control panel 31-control unit 34, and the sub motor 27 is stopped by the command from the control unit 34.

As a result, the antifreeze in the tube 5 is controlled by the switching valve] 6
Closing and Check Valve] 4, the tube 5 is closed in a pressurized state, and the watertight rubber 4 is pushed forward by the predetermined engraving, and the tube 5 is crimped to the gate 3 with an appropriate pressure. and keep it watertight.

Furthermore, since the area ratio of the upper chamber a and the lower chamber ib is 10:1 to 20:1, the main pump 1
The actual pressure in the lower chamber a is increased in small units relative to the actual pressure on the third side. This facilitates pressurization control of the watertight rubber 4 by increasing and decreasing the water head of the dam 1.

Thereafter, fluctuations in the water level are constantly detected by a water level gauge 33, and water pressure in the tube 5 is constantly detected by a pressure detector 30, and these are input to the computer 32 via the control I panel 31.

From this state, for example, if the water level of the dam 1 rises and the rising value exceeds a certain value, the control panel 31 →
A command is issued from the control unit 34 and the sub pump 27 is activated to further increase the pressure. When the target value is reached, the 130 pressure is stopped and the watertight rubber 4 is pressurized in accordance with the water head of the dam 1. .

Conversely, when the dam water level falls and the detected value of the water level gauge 33 becomes less than a certain value, the switching valve 29 is opened via the control section 34. As a result, the antifreeze in the upper chamber a returns to the tank 10 via the antifreeze outlet pipe 26, so that the pressure in the tube 5 decreases. This pressure drop is detected by the pressure detector 30,
When the lower target set value is reached, the switching valve 29 is switched to close by a command from the control unit 34.

In reality, it is difficult to stop at a lower set value, so the pressure inside the tube 5 will be lower than that set value.

Therefore, this detected value is passed through the control panel 31 to the computer 3.
2 and is compared and calculated by the computer 32, and when the detected value reaches the target value, it is stopped. In this way, the water-tight rubber 4
Press down to maintain watertightness.

To change the gate from the closed state to the open state, the switching valve 16.29 is activated by the opening signal of the gate 3 and a command from the control unit
becomes open. As a result, the antifreeze in the tube 5 returns to the tank 10 via the antifreeze supply pipe 11 → antifreeze discharge pipe 15, and the antifreeze in the upper chamber a also returns to the tank 10 via the antifreeze outlet pipe 26. Therefore, the pressure inside the tube 5 becomes zero, and the frictional force of the watertight rubber 4 becomes small when the gate 3 is opened, making it easier to open and close the gate 3.

If the pressure inside the tube 5 becomes abnormally high for some reason, it is returned to the tank 10 via the relief valve 35 to avoid overpressure.

In addition, in the above embodiment, the tube 5 is attached to the back of the watertight rubber 4.
However, if the amount of movement of the watertight rubber 4 is relatively small, the tube 5 can be omitted and water pressure can be applied directly to the watertight rubber 4.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

The back of the watertight rubber and the antifreeze storage tank are connected via an antifreeze supply pipe equipped with a main pump, and the antifreeze storage tank is connected via an antifreeze discharge pipe equipped with a first switching valve, and the antifreeze supply pipe is connected to the antifreeze supply pipe. A lower chamber of a hydraulic cylinder consisting of an upper chamber and a lower chamber formed by a piston fitted in the cylinder is connected, and the upper chamber and an antifreeze storage tank are connected to each other, and an antifreeze inlet pipe equipped with a sub-pump and a second switching valve are connected. The rod of the piston is connected to the outside of the cylinder through the provided antifreeze outlet pipe, and a stopper is provided at the end of the piston, which eliminates instability of control caused by air mixing with the antifreeze, as in the past. It will be resolved.

In addition, since the area ratio of the lower chamber to the lower chamber is 10:1 to 20:1, it is possible to fine-grained pressure control of the watertight rubber by using the regular main pump and sub pump together, without using a special main pump. At the same time, the length of the tube at the top of the tube is shortened to just the width, and the production cost is low.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part, and FIG. 3 is a cross-sectional view showing a water conduit and a gate of a conventional dam.

Claims (1)

[Claims] (1) A watertight rubber is pressed onto a gate provided in a dam via a liquid pressure means, and the liquid pressure means connects the back of the watertight rubber and an antifreeze storage tank with a main pump. an upper chamber formed by a piston fitted in a cylinder; and an upper chamber formed by a piston fitted in a cylinder; The lower chamber of the hydraulic cylinder consisting of a lower chamber is connected, and the upper chamber and an antifreeze storage tank are connected via an antifreeze inlet pipe equipped with a sub-pump and an antifreeze outlet pipe equipped with a second switching valve, and the piston A watertight device for a gate, characterized in that the rod projects outside the cylinder, a stopper is provided at the projecting end, and the area ratio of the upper chamber to the lower chamber is 10:1 to 20:1. .