JPS6328979Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an earth and sand discharge device for preventing earth and sand and driftwood from flowing into a dam reservoir.

Reservoirs obtained by blocking rivers with dams become shallower over the years due to sedimentation and sedimentation, reducing the effective amount of water stored and causing problems in power generation and water intake. On the other hand, in rivers downstream from dams, the inflow of sediment is significantly reduced, causing the problem that it is no longer possible to obtain the sediment necessary to stabilize the foundations of bridge piers and river structures.

In order to solve the various problems mentioned above, for example, a device has been developed in which a sand discharge pipe is laid at the bottom of the reservoir, and the settled sediment flows in through the opening on the upstream side of the sand discharge pipe and is discharged to the downstream side of the dam. Although it has been proposed,
At present, no sand removal device has been developed that is sufficiently effective.

The purpose of this invention is to provide a sediment discharge device that is more effective in preventing sediment and driftwood from flowing into a reservoir and has a greater capacity to discharge sediment to the downstream side than the conventional sediment discharge devices mentioned above. It is to be.

In other words, this idea provides a sand drainage channel leading from the upstream of the river to the dam, and on the upstream side of this sand drainage channel, a branch point with an inlet that allows water to flow into the reservoir is provided, and an overflow gate is installed at this inlet. A screen will be installed, a gate will be installed on the downstream side of the branch point, and the downstream end of the sand drainage channel will be connected to the sand drainage port installed in the dam.
This sand discharge port is provided with a sand discharge gate.

Since this design has the above-mentioned configuration, water flowing from the upstream of the river and containing sediment and driftwood flows into the reservoir over the overflow gate at the inlet provided at the upstream branch of the discharge channel, and the water becomes heavy. Sediment does not cross the overflow gate and remains in the waterway. Therefore, the amount of sediment flowing into the reservoir is significantly less than in conventional reservoirs, and the screen also prevents driftwood and the like from flowing into the reservoir.

In addition, by opening the gate in the channel and the sand discharge gate in the dam, the sediment that has settled in the sediment drainage channel can be discharged to the downstream side of the dam along with the water that flows into the channel from the upstream side of the river. There is also no fear that river sediment will decrease.

Therefore, the turbid water generated during floods is directly discharged downstream, and it is possible to prevent the water from becoming turbid for a long period of time in the reservoir, so unlike the conventional method, the turbid water is not discharged downstream for a long period of time and pollutes the downstream river.

If it is necessary to raise the water level in the reservoir, the overflow gate is lowered and the gate downstream of the branch point is closed, allowing all water from the upstream river to flow into the reservoir. In addition, if the water volume in the reservoir is large, the water volume can be easily adjusted by opening both the overflow gate and the downstream gate of the branch point to allow water to flow into both the reservoir and the waterway. It has the effect of

Next, one embodiment of this invention will be described based on the accompanying drawings.

In FIG. 1, 1 is a reservoir, 2 is a dam, and 3 is a sand drainage channel provided along the reservoir 1. In the illustrated case, it is an open channel, but it may be a closed channel.

4 is an upstream river, and 5 is a downstream river. Water from the upstream river 4 once flows into the waterway 3, and then flows into the reservoir 1 through an inlet 6 provided at a branch point a. There is. This inlet 6 is shown in Figs. 3 and 4.
As shown in the figure, it has an overflow gate 8 and a screen 9 that are driven by a hydraulic cylinder 7 or the like.

In addition, there is a third
As shown in FIG. 5, a slide gate 11 that is raised and lowered by a hydraulic cylinder 10 or the like is provided.

Reference numeral 12 in FIG. 2 denotes a sand discharge port provided in the dam 2, which communicates with the downstream end of the water channel 3 and has a sand discharge gate 15 operated by a hydraulic cylinder 14.

16 is a discharge port provided in the dam 2, and has a gate 18 operated by a hydraulic cylinder 17.

In addition, spare gates 20, 21 that are raised and lowered by a hoist 19 installed on the dam 2 are provided at the entrances to the sand discharge outlet 12 and the discharge outlet 16.

In the above embodiment, the water containing sediment, driftwood, etc. that has flowed into the sand discharge channel 3 from the upstream river 4 passes through the screen 9 at the branch point a to remove the driftwood, etc., and then overflows through the overflow gate 8. By doing so, heavy sediment such as earth and sand is removed, so that almost no driftwood or earth and sand enters the reservoir 1.

On the other hand, water containing soil and driftwood is removed from the slide gate 1.
1 , flows downstream through the waterway 3 , passes through the preliminary gate 20 and the sand discharge gate 15 , and is discharged from the sand discharge port 12 to the downstream river 5 .

[Brief explanation of the drawing]

Fig. 1 is a plan view of a reservoir in which the device of this invention is implemented, Fig. 2 is an enlarged vertical sectional side view of the same partially cut away,
FIG. 3 is an enlarged plan view of the branching point of the sand discharge channel, FIG. 4 is an enlarged longitudinal sectional side view of the overflow gate, and FIG. 5 is an enlarged longitudinal sectional view of the slide gate. 1...Reservoir, 2...Dam, 3...Sand drainage channel,
4... Upstream river, 5... Downstream river, 6... Inlet, 8... Overflow gate, 9... Screen, 1
1...Slide gate, 12...Sand discharge port, 15...
... Sand discharge gate, a... Branching point.

Claims (1)

[Scope of utility model registration request] A sand drainage channel is established from the upstream of the river to the dam, and on the upstream side of this sand drainage channel, there is a branch point with the inlet where water flows into the reservoir, and an overflow gate and screen are installed at this inlet. A sand discharge device for a dam, in which a gate is provided on the downstream side of a point, the downstream end of a sand discharge channel is communicated with a sand discharge port provided in a dam, and this sand discharge port is provided with a sand discharge gate.