JPH044024Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a water gate opening/closing device that opens and closes water intakes and outlets of power plants, water gates of dams, rivers, etc. by raising and lowering gates.

[Prior art]

In general, water gates such as water intakes and discharge ports of power plants and agricultural water intakes are equipped with a water gate opening/closing device that is equipped with an elevating gate that shuts off or opens between the upstream waterway and the downstream waterway. is provided. There are two types of devices of this type: those that are always closed and then opened when water is discharged, and those that are always open and then shut off when, for example, repairing a generator or in the event of a storm surge.
In either case, the water pressure on the upstream side is applied to the gate, so a large amount of force is required to open and close it.
In particular, when opening the gate, the gate must be raised against water pressure and its own weight, so conventionally, this type of opening/closing device required a drive source of extremely large capacity. Also, those that are opened and closed manually require a great deal of effort.

[Summary of the idea]

The present invention was developed in view of the above points, and when the gate reaches the bottom, the lower ends of the side walls facing the upstream and downstream waterways are suspended below the gate bottom plate. A raised-bottomed space is provided at the lower end of the gate to cut off both the upstream and downstream waterways, and a passage with an on-off valve is provided between the raised-bottomed space and the upstream waterway. By communicating with the waterway, not only can a stable shut-off state of the gate be reliably obtained by keeping the shut-off valve closed at all times, but also the shut-off valve can be kept open at the beginning of opening from the shut-off state of the gate. In this way, there is provided a water gate opening/closing device which can reduce the power required to open and close the gate by applying an upward force due to water pressure to the gate. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

〔Example〕

1 and 2 show an example in which the water gate opening/closing device according to the present invention is implemented in a water intake water gate of a power plant. In the figure, the gate 1 is made of FRP resin, which is known as reinforced plastic reinforced with glass fiber, and has a vertically long rectangular cross section, and is used to block the upstream waterway 2 and the downstream waterway 3. It is formed in a watertight manner between both ends in the width direction and the water gate so that it can be opened, and is supported so as to be able to move up and down via rollers or the like. A drive device (not shown) for raising and lowering the gate 1 is provided on the ground or on the dam. Gate 1 bottom plate 4
is formed in a raised bottom shape so that a raised bottom space 6 is formed between the bottom plate 4 and the bottom surface 5 of the water channel when the gate 1 touches the bottom. In addition, the lower edges of the upstream water pressure opposing side plate 7 and the downstream water pressure opposing side plate 8, which land on the bottom almost orthogonally to the waterway bottom surface 5, are each suspended downward to form a watertight space between them and the waterway bottom surface 5. As a result, when landing on the bottom, the raised bottom space 6 is isolated from both the upstream and downstream channels 2 and 3.

Furthermore, the upstream waterway 2 and the raised bottom space 6 are communicated through an L-shaped communication pipe 9 provided in the gate 1, and this communication pipe 9 can be opened and closed from the outside. An on-off valve 10 is provided.

The operation of the water gate opening/closing device configured as above will be explained. FIG. 2a shows the gate 1 reaching the bottom and being closed off, and the downstream channel 3 is empty of water. Further, the on-off valve 10 is closed. When opening the gate 1, when the on-off valve 10 is opened by an external operation, the water in the upstream waterway 2 flows into the raised bottom space 6, and the pressure of this water causes the gate 1 to have a head H. An upward force, or buoyancy, due to water pressure equivalent to . When the gate 1 is raised by driving the lifting device for the gate 1 after the water is introduced, a buoyant force, that is, an upward acting force is applied at the initial stage of the rise, so that the power required when starting the drive device is reduced. gate 1
When the water begins to rise, water in the upstream waterway 2 flows into the downstream waterway 3 through the lower part of the gate 1 as shown by the arrow in FIG. 2b. Figure 2c shows the gate 1 having finished rising. At this time, on-off valve 1
0 is open. When the gate 1 is to be lowered again, the on-off valve 10 is closed and the lifting device is driven to bring the gate 1 to the bottom as shown in FIG. 2d. In this case, since the raised bottom space 6 is blocked from both water channels 2 and 3,
pressure is small. Then, by drying up or flowing down the downstream waterway 3, the state shown in FIG. 2a is achieved.

In addition, in this example, the gate 1 is a lightweight
Since it is made of FRP resin, the lifting power of the gate 1 is reduced considerably, but it is not necessarily made of FRP resin, and even if it is made of a metal plate, the effect of the raised bottom space 6 can be exhibited. In addition, if it is made of FRP resin, it has excellent corrosion resistance, so
Increases the durability of the gate.

[Effect of idea]

As is clear from the above explanation, according to the water gate opening/closing device according to the present invention, when the gate reaches the bottom,
The lower end of the side wall facing the upstream and downstream waterways is suspended below the gate bottom plate, thereby creating a raised bottom space that is cut off from both the upstream and downstream waterways. It is provided at the lower end and is configured to communicate between this raised bottom space and the upstream waterway through a passageway with an on-off valve, so despite the simple configuration, the on-off valve is always closed. By doing so, not only can a stable closed state of the gate be obtained reliably, but also by opening the on-off valve at the initial stage of opening when the gate is raised from the closed state, it is possible to By allowing water from the side channel to flow in via the channel, it is possible to apply an upward force (buoyancy) to the gate due to large water pressure equivalent to the head of the upstream channel, and as a result, the gate initially rises. It has various excellent effects, such as reducing the force required to lift the lift, significantly reducing the power required for the lifting and lowering device, and significantly reducing labor in the case of manually opened/closed devices. Further, according to the present invention, when the above-mentioned on-off valve is closed and the gate is lowered to set the shut-off state, there is no upward force, so that it is possible to reliably obtain a stable shut-off state. There are advantages.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the water gate opening/closing device according to the present invention, FIG. 1 is a longitudinal sectional view thereof, and FIG.
The figure is an explanatory diagram of the operation. DESCRIPTION OF SYMBOLS 1... Gate, 2... Upstream waterway, 3... Downstream waterway, 4... Bottom plate, 5... Channel bottom, 6... Raised bottom space, 7... Upstream side water pressure opposing side plate, 8...
...Downstream water pressure opposing side plate, 9...Communication pipe, 10...
Open/close valve.

Claims (1)

[Scope of utility model registration request] The upstream water pressure facing surface is provided with a gate that can be raised and lowered almost perpendicularly to the bottom of the waterway, and the side walls facing the upstream and downstream waterways of this gate are suspended below the gate bottom plate. A raised-bottom space is provided at the lower end of the gate that is cut off from both the upstream and downstream waterways when the gate touches the bottom, and an external 1. A water gate opening/closing device, characterized in that the water gate is connected through a water passage having an opening/closing valve that can be operated from the gate and is opened when the gate is released from a closed state.