JPS5853310Y2 - drum gate - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drum gate that can prevent noise, vibration, etc. during overflow, and can be easily erected even when the overflow water is deep.

Drum gates are typically installed and used as overflow base gates for spillways.

The drum gate currently in use is as shown in FIG.

That is, the drum gate 1 is a hollow body with a fan-shaped cross section,
The drum gate 1 is hinged to the upper edge on the upstream side of a chamber 3 bored in the embankment body 2, and can be raised and lowered by the water pressure inside the chamber 3.
Water is injected into the chamber 3 from a water injection pipe 4 via an injection/drainage switching valve 5, and water is drained from a drainage pipe 6 via an injection/drainage switching valve 5, and no measures are taken in the event of an overflow. However, it had the following problems.

That is, when the drum gate 1 is fully closed, when the water level on the upstream side of the drum gate 1 rises and overflows from the overflow end of the skin plate 1A, this overflowing water flows to the back plate 1B of the drum gate 1 as shown in FIG. Since the water flows down along the back plate 1B while colliding with the
As the water flows down along the direction B, it hits the watertight rubber bearing part and continuously damages the watertight rubber part, and it is easy to take countermeasures against negative pressure on the downstream surface of the overflow end of the skin plate 1A. Furthermore, no measures have been taken to reduce the upright moment of the drum gate that occurs when the overflow depth becomes large.

The present invention relates to a drum plate made in view of the above-mentioned circumstances, and includes extending the overflow end of the skin plate of the drum gate to at least the vicinity of the vertical line of the downstream end of the back plate when the drum gate is fully closed, and An auxiliary buoyancy tank is installed on the opposite end of the back plate and at a position closer to the chamber side than a vertical line passing through the center of rotation of the drum gate when the drum gate is fully opened. be.

Embodiments of the present invention will be described with reference to the drawings.

As shown in Fig. 1, the overflow end of the skin play (IA) of the drum gate 1 is extended to the vicinity of the vertical line l of the downstream end of the back plate 1B of the drum gate 1, which is fully closed by the water pressure in the chamber 3. In addition to the lip 7, an auxiliary buoyancy link 8 is provided on the opposite end of the back plate 1B to increase the upright moment of the drum gate 1.

Now, when the drum gate 1 is fully closed, the water level on the upstream side of the drum gate 1 is rising, and this rise causes water to overflow (
When the water overflows (overflow), the overflowing water does not collide with the back plate 1B of the drum gate 1 and flows through the embankment body 2 as shown in Fig. 1.
flows down to.

Therefore, no noise or vibration occurs, and the downstream space of the back plate 1B (space partitioned by overflowing water)
This is advantageous because air can be easily supplied to the area.

Further, an auxiliary buoyancy tank 8 can be attached to the anti-overflow end side of the back plate 1B of the drum gate 1 so as to be biased toward the chamber 3 side with respect to a vertical line passing through the center of rotation of the drum gate 1 when the drum gate 1 is fully opened. Therefore, when raising drum gate 1:
When the drum gate 1 is injected into the chamber 3, the drum gate 1 tries to float due to its own buoyancy, and the buoyancy of the auxiliary buoyancy tank 8 causes the drum gate 1 to float around its rotation center. This action occurs, and the drum gate 1 can be erected.

Thereby, even if the overflow water depth is large, the drum gate 1 can be easily erected.

At this time, the auxiliary buoyancy tank 8 is connected to the drum gate 1 as shown in the figure.
By protruding from the back plate 1B of the drum gate 1, the auxiliary buoyancy tank 8 can act as a stopper that hits the protrusion of the embankment and stops the drum gate 1 from rising.

In the drum gate of the present invention, an auxiliary buoyancy tank 8 is attached to the back plate of the drum gate 1.
The auxiliary buoyancy tank 8 is not located directly below the center of rotation of the drum gate 1 when the drum gate 1 is fully opened, but is located on the chamber 3 side.
Since the direction of the pressure due to the buoyancy of the drum gate 1 is directed to a position downstream of the center of rotation of the drum gate 1, the upright moment of the drum gate 1 can be increased.

Moreover, it is advantageous in terms of space if the shape of the auxiliary buoyancy tank 8 is made into an arc shape centered on the center of rotation of the drum gate 1 as shown in the figure.

When the drum gate 1 is to be laid down, the drum gate 1 can be laid down without any trouble simply by draining water from the chamber 3.

Note that the present invention is not limited to the illustrated and explained embodiments; for example, the overflow surface of the skin plate may be made into a smooth curved surface, or the overflow end of the skin plate may not be extended and other plate-like members may be attached. Add a stiffener to the overflow end of the skin plate to match this overflow surface, and strengthen it with a stiffener etc. so that it is aligned with at least a vertical line l.
The extension overflow end of the skin plate or the plate-shaped member provided at the overflow end should be curved to reduce the amount of digging of the downstream channel bed, and the stopper when standing up should be a drum gate It is optional to provide the auxiliary buoyancy tank in a shape other than that shown in the drawings, to arrange a plurality of auxiliary buoyancy tanks in an appropriate number of rows on the back plate, etc., as long as it does not depart from the gist of the present invention. Of course, various changes can be made.

As described above, according to the drum gate of the present invention, (i) it is possible to eliminate the collision of overflowing falling water with the back plate, thereby preventing noise;

(ii) In combination with (i), it is possible to easily cope with the fluctuating pressure at the freezing point of overflowing falling water, thereby effectively preventing vibrations.

(iii) Damage to watertight parts due to overflowing falling water can be prevented.

(iv) Even if the overflow water depth is large, the standing operation can be performed easily and reliably.

(v) The mechanism is simple and can be manufactured easily.

Demonstrates excellent effects such as

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the mechanism and operating state of the drum gate of the present invention, and FIG. 2 is an explanatory diagram showing the mechanism and operating state of the conventional drum gate. 1... Drum gate, 1A... Skin plate, 1B... Back plate, 2... Bank body, 3... Chamber, 7 ······lip,
8... Auxiliary buoyancy tank, l... Back plate 1
The vertical line at the downstream end of B.

Claims (1)

[Scope of utility model registration request] The skin plate overflow end of the drum gate is extended at least to the vicinity of the vertical line of the downstream end of the back plate when the drum gate is fully closed, and the drum gate is extended on the opposite overflow end side of the back plate and when the drum gate is fully opened. A drum gate characterized by having an auxiliary buoyancy tank installed at a position closer to the chamber than a vertical line passing through the center of rotation of the drum gate.