JPS5849230Y2 - Sediment stop gate for dam sand removal equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sand stopper gate for use in dam sand removal equipment.

As shown in Fig. 1, the dam sand removal equipment has a structure in which a water stop gate (main gate) 2 is provided on the downstream side of the sand removal pipe 1, and a sand stop gate 3 that also serves as a preliminary gate is provided on the upstream side, or As shown in Fig. 2, a structure in which a sand stopper gate 3 is provided in the middle of the sand discharge pipe 1 and a preliminary gate 4 is provided on the upstream side;
etc. are provided.

The reason why 2 or 3 gates are configured in this way is because the sand drain pipe 1 and water stop gate 2 are to be maintained and inspected, which are expected to be worn out and partially damaged due to the drainage of sediment. Since it is necessary to keep the portion dry, spare gates 3 and 4 are required.

Q When closing the water stop gate 2, it is necessary to provide a sand stop gate 3 to prevent sand from being trapped upstream of the water stop gate 2 in order to prevent sand from getting caught in the watertight part.

According to etc.

However, regardless of the layout of the sand removal equipment (two-gate installation, three-gate installation), the flow velocity and energy in the sand removal pipe 1 decrease due to the blockage of the sand stop gate 3, and the sediment that has passed through the sand stop gate 3 is stopped. Residual sediment in water gate 2 part 5
This may cause problems such as making it impossible to fully close the water stop gate 2.

The present invention proposes a sand stopper gate for dam sand removal equipment that can solve the above-mentioned problems, and one embodiment thereof will be described below with reference to FIGS. 3 to 7.

In the figure, 10 is a sand discharge pipe, 11 is a water stop gate, 12 is a sand stop gate, and 13 is a preliminary gate.

In the present invention, the sand stopper gate 12 is provided with a sand discharge pipe 10 at the top.
It has a discharge channel 14 that can match the inner diameter of the sand discharge pipe 10, and a gate main body part 15 that can close the sand discharge pipe 10 at the lower part.

Reference numeral 16 indicates an opening/closing device consisting of a hydraulic cylinder or the like.

Note that the inner surface of the drainage channel 14 is lined with a wear-resistant material similarly to the inner surface of the sand discharge pipe 10.

As shown in FIGS. 3 and 6, the water stop gate 11 and the reserve gate 13 are fully opened, and the earth stop gate 12
Closing of the gate is performed in the following manner while in the sand removal work condition (when fully opened) with the discharge channel 14 placed at the lowest position and the discharge channel 14 matched with the inner diameter of the sand removal pipe 10.

That is, first, the opening/closing device 16 is operated to raise the sand stopper gate 12.

Then, the gate main body 15 protrudes from the lower part of the sand discharge pipe 10 and begins to block the flow at the bottom of the sand discharge pipe 10.

Then, as shown in FIG. 4, among the earth and sand flowing near the bottom, those with larger particle sizes are deposited upstream of the gate main body 15, and do not flow toward the water stop gate 11 downstream.

As the blockage by the gate main body 15 progresses, the water overflows from the upper part of the gate main body 15, that is, the water flows into the discharge channel 14.
The amount of sediment contained in the water flowing downstream through the tube decreases, and its maximum particle size also decreases, so that just before it is completely closed, only water containing almost no sediment flows.

Therefore, sedimentation that is harmful to the operation of the water stop gate 11 does not occur, and even if sedimentation occurs, it can be swept away by the flow overflowing from the gate main body 15.
As shown in FIG. 7, the sand stop gate 12 can be completely closed, and the water stop gate 11 can be closed.

In the above embodiment, the sand stop gate 12 is arranged between the water stop gate 11 and the reserve gate 13, but this can also be adopted as a reserve gate combination as shown in Fig. 1. .

Also, it does not matter whether it is a slide gate type or a roller gate type.

According to the present invention described above, by raising the sand stopper gate after sand removal work, when the gate is closed, the flow is first cut off from the flow at the bottom, and the flow is diverted from the flow of sand with large particles flowing near the bottom. As the closing operation progresses, the amount of sediment contained in the water can be reduced and its maximum particle size can be reduced, and just before the closing operation is complete, only water that does not contain sediment can flow out.

Therefore, the accumulation of earth and sand that is harmful to the operation of the water stop gate does not occur, and the water stop gate can be completely closed reliably.

In addition, since the door groove is always blocked by the ring follow gate type, there is no adverse effect such as disturbing the high-speed flow during sand removal by the door groove.

Further, as described above, wear can be prevented by lining the drainage channel portion with a wear-resistant material like the inner surface of the sand discharge pipe.

[Brief explanation of drawings]

Figures 1 and 2 are longitudinal cross-sectional side views showing conventional examples, respectively.
Fig. 7 shows an embodiment of the present invention, Figs. 3 to 5 are longitudinal sectional side views showing the operating state, Fig. 6 is a longitudinal sectional front view in Fig. 3, and Fig. 7 is a longitudinal sectional view in Fig. 5. It is a front view. 10...Sand discharge pipe, 11...Water stop gate, 12...Sand stop gate, 13...
Spare gate, 14... Spillway, 15...
・Gate body part, 16...Opening/closing device.

Claims (1)

[Scope of utility model registration request] A sediment stop gate provided upstream of the water stop gate of a sand discharge pipe that has a water stop gate on the downstream side, and has a discharge channel in the upper part that can match the inner diameter of the sand discharge pipe, and a sand discharge pipe in the lower part. What is claimed is: 1. A sand stopper gate for dam sand removal equipment, characterized in that it has a gate main body that can be closed, and is connected to an opening/closing device.