JPS6052247B2 - 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 arranged upstream of the ventilation box 6, and a bottom upper 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 of the discharge channel. In such a case, negative pressure and cavitation will occur at the location where the water vein separates, and the bottom of the outlet channel will be 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 gate is opened at the desired opening (opening) as shown in Figure 2, but when the gate 4 is opened to the desired opening from the fully closed state, there is no problem when the opening is small. 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 integrated and 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 is generated along the bottom water stop rubber 8, causing the following problem. In other words, the discharge water vein 12A at the minute opening degree
enters the ventilation hole 10 and narrows the cross section of the ventilation box 6,
In some cases, it may be filled with water, which significantly impairs the ventilation function. The present invention provides an aeration device at the bottom water stop part of a discharge control gate provided in a dam, and a ventilation box is provided downstream of the bottom water stop rubber installation position, and the downstream side is placed above the ventilation box. A jump lip is provided that is inclined to the side, and a baffle plate located below the jump lip is connected to a downstream bottom plate, and a ventilation hole facing downstream is formed by the jump lip and the baffle plate, and the The present invention provides a gate bottom water stop ventilation device characterized in that a box is communicated with a ventilation hole. According to this configuration, a stream of discharged water at a minute opening collides with a zipper lip, thereby preventing ventilation. The box part can be zipped up to allow water to flow downstream, and since the ventilation openings are directed downstream below the zip-up lip, it is possible to prevent discharged water from entering the ventilation openings.

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

20 is a dam 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 doorstop hardware 24 is provided upstream of the ventilation pipe 23. A bottom water stop rubber 25 is attached to the upper surface of the door stop hardware 24. The ventilation box 23
The upstream top plate is formed by a zip-up lip 26 that is inclined so that the downstream side is upper, and a rectifying plate 27 is provided below the zip-up lip 26.
This current plate 27 completely covers the upper part of the ventilation box 23, and most of its upstream side is inclined in the same direction as the upstream lip 26. As a result, the zip-up lip 26
and the rectifying plate 27 form a ventilation hole 28 facing downstream. A ventilation hole 29 is provided at the most upstream part of the current plate 27.
At the same time, a ventilation hole 31 is also formed in the partition plate 30 inside the ventilation box 23, so that the ventilation box 23 is connected to the ventilation opening 28.
is connected to. The current plate 27 is connected to the downstream bottom plate 32. When the gate 22 is slightly opened, the discharge water vein 33 is . The air collides with the zip-up lip 26, is zipped upward, passes through the ventilation opening 28, and then is guided by the bottom plate 32 and flows downstream.

Note that when the opening is relatively large, the zip-up lip 26 collides with the bottom plate 32, and the zip-up lip 26 collides with the bottom plate 32.
The impact on 6 is gone. 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 faces downstream below the zip-up lip, 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 when the opening is relatively large, it is possible to prevent the zip-up lip from being accidentally damaged, and the current plate is connected to the downstream bottom plate. Because of this, the discharge water vein can flow smoothly downstream when the opening is relatively large.

[Brief explanation of the drawing]

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...Door stop hardware, 25...Bottom water stop rubber, 26...Zip lip, 27...Brightening plate, 28...Vent opening Hole, 29...Vent hole, 30...Partition plate, 31...Vent hole, 32...Bottom plate, 33...Discharge water vein .

Claims (1)

[Claims] 1. A ventilation device for the bottom water stop part of a discharge control gate installed in a dam, with a ventilation box provided downstream of the bottom water stop rubber installation position, and a ventilation box slanted at the top so that the downstream side is the upper side. A jump lip is provided, a baffle plate located below the jump lip is connected to a downstream bottom plate, the jump lip and the baffle plate form a ventilation hole facing downstream, and the ventilation box is opened for ventilation. A gate bottom water stop ventilation device characterized by communicating with a hole.