JPS6052249B2 - 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. 2 and 3 show the vicinity of the conventional ventilation box 6. 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 a case, 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 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. 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, thereby significantly inhibiting the ventilation function. Furthermore, water that has flowed into the ventilation box 6 cannot be easily removed.
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 ventilation box is provided downstream of the bottom water stop rubber installation position, and the top plate of the ventilation box is used to connect the bottom water stop rubber A plurality of ventilation holes are formed at the side ends, and all or part of these ventilation holes are communicated with a pipe arranged in the ventilation box,
This invention provides a gate bottom water stop ventilation device characterized by forming a suction port at the lower end of the pipe. According to this configuration, the discharged water vein at the minute opening always flows downstream through the upper part of the ventilation hole. Even if water were to flow into the ventilation box, the suction action generated within the vibrator due to the negative pressure mentioned above will automatically direct the water to the outlet side through the suction port and the vibrator. can be discharged.

An embodiment of the present invention will be described below with reference to FIG.

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 door stop hardware 24 is provided upstream of this ventilation box 23. A bottom water stop rubber 25 is attached to the upper surface of the door stop hardware 24. The ventilation box 23
A plurality of ventilation holes 27 are formed in the end portion of the top plate 26 composing the bottom water stop rubber 25 side, which penetrates in the vertical direction. A vibrator 28 whose upper end communicates with all or part of these ventilation holes 27 is disposed within the ventilation box 23,
A suction port 29 is formed at the lower end of the vibrator 28. A ventilation hole 31 is formed in the partition plate 30 inside the ventilation box 23, thereby communicating the inside of the ventilation box 23 with the ventilation opening 27. The top plate 26 is connected to a downstream bottom plate 32. As shown by the solid line in FIG. 4, when the gate 22 is slightly opened, the discharged water vein 33A passes over the vent hole 27 formed outside the contact angle, and then is guided by the bottom plate 32 and flows downstream.

Note that when the opening degree is relatively large as shown by the imaginary line in FIG. 4, the discharged water vein 33 does not collide with the top plate 26, but collides with the bottom plate 32 and flows downstream. According to the gate bottom water stop ventilation device of the present invention having the above configuration, the discharged water vein collides with the downstream side of the ventilation box when the opening degree is small, thereby allowing the discharged water vein to flow downstream through the upper part of the vent hole. .

Even if water were to flow into the ventilation box, the suction action generated within the vibrator due to the negative pressure generated will automatically direct the water accumulated in the ventilation box to the outlet side through the suction port and the vibrator. can be discharged.

[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...Door stop hardware, 25...Bottom waterproof rubber, 26...Top plate, 27...Vent hole, 2
8... Vibrator, 29... Suction port, 30...
...Partition plate, 31...Vent hole, 32...Bottom plate, 33,33A...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, in which a ventilation box is provided downstream of the bottom water stop rubber installation position, and the top plate of this ventilation box is used to close the end of the bottom water stop rubber side. A water stop part at the bottom of a gate, characterized in that a plurality of ventilation holes are formed in the bottom of the gate, all or part of these ventilation holes are communicated with a pipe arranged in a ventilation box, and a suction port is formed at the lower end of this pipe. Ventilation device.