JPS6052248B2 - Gate bottom water stop ventilation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aeration device at the bottom water stop portion of a discharge control gate provided in a dam.

A general example of a dam is shown in Figure 1.

In other words, 1 is the dam body, and in the middle part there is a discharge channel 2.
An overflow passage 3 is formed in the upper part. The discharge passage 2 is provided with a discharge adjustment gate 4, and the overflow passage 3 is provided with an overflow gate 5. A ventilation box 6 is provided at the bottom water stop portion of the discharge adjustment gate 4. The vicinity of the conventional ventilation box 6 is shown in FIGS. 2 and 3. That is, 7 is a door stop metal fitting disposed upstream of the ventilation box 6, and a bottom water stop rubber 8 is attached to its upper surface. The top plate 9 of the ventilation box 6 has a plurality of ventilation holes 10 and is connected to a bottom plate 11 located further downstream. As shown in FIG. 2, there may be places where the discharge water vein 12 separates from the bottom surface of the discharge channel. In such cases, negative pressure and cavitation occur at the water vein separation site,
The bottom of the outlet channel is eroded. In order to prevent this, a device for ventilating appropriate locations from the outside, that is, the vent box 6 is required. By the way, there is no problem when the opening is at the desired opening (opening) as shown in Figure 2, but when the gate 4 is opened at a small opening during the process of opening the gate 4 from the fully closed state to the desired opening. As shown in FIG. 3, a discharge water vein 12A is generated along the bottom water stop rubber 8. Furthermore, in recent years, from the viewpoint of effective use of water resources, groups of dams in the same water system have been integratedly managed by computers, and it has become necessary to release water at minute openings of the gates 4. When water is discharged for a long time due to this minute opening, the above-mentioned discharge water vein 12A along the bottom water-stop rubber 8 occurs, causing the following problem. That is, the discharged water vein 12A at a minute opening enters the ventilation hole 10, narrowing the cross section of the ventilation box 6, or in some cases causing the ventilation box 6 to be filled with water, significantly impeding the ventilation function.
The present invention is an aeration device for the bottom water stop part of a discharge control gate provided in a dam, in which a bottom water stop rubber is attached to the top surface of the ventilation box, and the bottom water stop rubber is attached to the upper rear end of the ventilation box so that the downstream side is the upper side. providing an inclined jump lip, connecting a baffle plate located below the jump lip to a downstream bottom plate, and forming a J ventilation opening facing upward downstream by the jump lip and the baffle plate; The present invention provides a gate bottom water stop ventilation device characterized in that the ventilation box is communicated with a ventilation hole, and according to this configuration,
When the opening is small, the discharged water vein collides with the zip-up lip, which allows the ventilation box to zip up and flow downstream, and the ventilation openings are below the zip-up lip and are directed toward the upper downstream side. Therefore, it is possible to prevent the flow of water from entering the ventilation holes.

Hereinafter, one embodiment of the present invention will be described based on FIG. 4.

20 is a tom body, 21 is a discharge channel, and 22 is a discharge adjustment gate. A ventilation box 23 is provided at the bottom water stop portion of the discharge adjustment gate 22, and a bottom water stop rubber 25 is attached to the upper surface of the top plate 24 of the ventilation box 23. The ventilation box 2
From the rear end of the top plate 24 of No. 3, a zip-up lip 26 that is inclined so that the downstream side is uppermost is connected, and a rectifying plate 27 is provided below the zip-up lip 26. This rectifying plate 27 is connected to the rectifying plate 2 from the rear surface of the ventilation box 23.
7 and are inclined in the same direction as the zip-up lip 26. Thereby, the zip-up lip 26 and the rectifying plate 27 form a ventilation hole 28 facing downstream and upward. Then, a ventilation hole 30 is formed in the rear plate 29 of the ventilation box 23, and a partition plate 31 inside the ventilation box 23 is formed.
A vent hole 32 is also formed in the vent hole 32, thereby communicating the vent box 23 with the vent hole 28. The current plate 27 is connected to a downstream bottom plate 33. As shown by the solid line in FIG. 4, when the gate 22 is slightly opened, the discharged water vein 34A collides with the zip-up lip 26, is zipped upward and passes through the ventilation opening 28, and then passes through the bottom plate 33. guided by the flow downstream.

Note that when the opening is relatively large as shown in the imaginary line in FIG.
It collides with the bottom plate 33 without colliding with the zipper lip 26, and there is no impact on the zip-up lip 26.

According to the gate bottom water stop ventilation device of the present invention having the above configuration, the discharged water vein collides with the zip-up lip when the opening degree is small, so that the discharge water vein can zip up the ventilation box section and flow downstream. Furthermore, since the ventilation hole is located below the zip-up lip and faces downstream and upward, it is possible to prevent discharged water from entering the ventilation hole.

Furthermore, since the zip-up lip is provided at a position where the discharge water veins do not collide with each other when the opening is relatively large, it is possible to prevent the zip-up lip from being accidentally damaged. Because of this, the discharge water vein can flow smoothly downstream when the opening is relatively large. In addition, in the case of a gate that receives relatively high water pressure, a box-shaped cross section is used to ensure the accuracy of the water stop position and to increase the rigidity of the door stop.In the present invention, this cross section of the door stop box is used as a ventilation box. Since it is used for both purposes, it is possible to omit the use of materials while still ensuring the desired accuracy and rigidity.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a general example of a dam, Figs. 2 and 3 are longitudinal sectional views of main parts of a conventional example, and Fig. 4 is a longitudinal sectional view of main parts showing an embodiment of the present invention. . 20... Dam body, 21... Outlet channel,
22... Discharge adjustment gate, 23... Ventilation box, 2
4...Top plate, 25...Bottom waterproof rubber, 2
6... Zip lip, 27... Rectifier plate, 28... Ventilation hole, 29... Rear plate,
30...Vent hole, 31...Partition plate, 3
2...Vent hole, 33...Bottom plate, 34
, 34A...Discharge water vein.

Claims (1)

[Claims] 1 A ventilation device at the bottom water stop part of a discharge adjustment gate installed in a dam, in which a bottom water stop rubber is attached to the top surface of the ventilation box, and a jump sloped at the rear end of the upper part of the ventilation box so that the downstream side is the upper side. A lip is provided, and a rectifier plate located below the jump lip is connected to the downstream bottom plate.
A gate bottom water stop ventilation device characterized in that a ventilation hole facing downstream and upward is formed by the jump lip and the current plate, and the ventilation box is communicated with the ventilation hole.