JPH04101Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a main discharge water system for a reservoir, particularly a new system for selectively taking clear water from a reservoir whose water becomes turbid over a long period of time.

[Prior Art] Currently, rivers downstream of existing dams are suffering from turbid water damage to varying degrees.

In other words, after a heavy rain, the turbidity of a river usually returns to clear water within two to three days, but once dense turbid water from a flood flows into a reservoir, the water in the reservoir is mixed throughout and becomes turbid. This turbid water is discharged downstream for a long period of time, which prevents moss from growing on the rocks at the riverbed, causing damage such as the inability of ayu to grow, and other negative effects such as pollution and deterioration of the living environment.

Several techniques have been proposed in the past to prevent damage from turbid water, but one representative example is the "selective water intake device" devised by the applicant himself (Fig. 5 of Publication No. 1661/1983). There are A to C).

This idea has multiple door bodies 20 along the vertical direction.
are arranged in a row, and the connecting tools 22 are connected so that an opening 21 of a desired size is formed between each door body.
In this configuration, a hoisting device is provided above the door body to connect with the uppermost door body and lift the door body.

Specifically, as shown in the figure, a common hanging rod is inserted into two overlapping door bodies, and when the hanging rod is rolled up, openings 21 are created sequentially by the length of the hanging rod. Water can be selectively taken from the water layer at any depth through the opening by utilizing the density difference of water inside and outside the door body.

On the other hand, as another solution, a method of filtering all of the main discharge water is being considered, with slow gravel filtration, pressure-type rapid filtration, precision filtration, etc. being cited as the main methods.

[Problems to be solved by the invention] Among the conventional techniques, the drawback of water intake using a selective water intake device is that depending on the climatic conditions, the next flood may begin before the clear layer is formed, making the water in the entire reservoir turbid.
Unfortunately, when early autumn arrives and the heat dissipation period begins, the whole pond undergoes a general circulation caused by vertical convection, and as a result of vertical mixing, the water in the reservoir becomes turbid for a long period of time until the following spring, no matter which layer water is taken from. The point is that the water is becoming murky.

In addition, regardless of the filtration treatment method, the amount of water to be treated is too large, so large facilities and
Complicated maintenance and high maintenance costs are hindering its practical application.

In order to solve the above-mentioned problems, the main purpose of the present invention is to selectively take water from the upstream channel where the water clears relatively quickly, and is also equipped with a control function that can respond to emergencies such as flooding and sedimentation. The purpose is to provide a main discharge water system.

[Means for Solving the Problems] The main water discharge device according to the present invention includes an upstream dam and a downstream dam in a waterway to form an upstream reservoir and a downstream reservoir. The reservoir is connected to the main discharge channel of the downstream dam along with the downstream water intake via a water conduit installed at the bottom of the downstream reservoir, and the amount of water released from each intake can be adjusted by opening and closing a control valve attached to each intake. The upstream dam is formed by integrally combining a fixed gate and a movable gate, and the upstream reservoir is equipped with a water level sensor and a sediment sensor, which detect the water level and inflow of sediment to open and close the movable gate. The above-mentioned problems were solved by controlling the selection of the water intake and the amount of water discharged from the water intake in response to the opening and closing of the control valve.

[Function] The function of the main discharge water device of the present invention will be explained based on FIGS. 1 to 3 showing examples.

FIG. 1 is a front sectional view showing the steady state of this embodiment of the device.

During normal operation, the movable gate 12 of the upstream dam is closed, and the clarification flowing in from the upstream side is blocked, and the water volume in the upstream reservoir increases until it reaches the water level at the upstream water intake 5, while the control valve 9 is open and The clear water taken from the reservoir does not enter the downstream reservoir, passes through a water pipe 7 installed at the bottom of the pond, and is discharged downstream from the main waterway 8 that penetrates the downstream dam 2.

During this time, the downstream control valve 10 is closed and no water is taken from the downstream water intake port 6.

The opening degree of the control valve 9 is adjusted so that the inflow from the upstream and the discharge to the downstream are balanced and the water levels W ₁ and W ₂ of the upstream and downstream reservoirs are maintained at approximately constant values.

Figure 2 shows the effect when sediment flows into the upstream reservoir 3 from upstream and accumulates in an abnormal situation. When the soil is detected, the action is exchanged as shown in Figure 2B.

That is, the control valve 9 closes and water intake from the upstream water intake 5 is stopped, and the movable gate 12 opens and the stored water and sediment on the upstream side flow into the downstream reservoir 4 over this gate, and the sediment accumulated on the upstream side. are largely eliminated.

At the same time, the control valve 10 on the downstream side opens, water intake starts from the downstream water intake 6, and water is discharged from the main waterway 8 to the downstream of the dam.

In this state, water flow inside the water pipe 7 is stopped.

When most of the sediment accumulated in the upstream reservoir is pushed by the water force and discharged downstream, the sediment detection sensor 1
The signal No. 4 stops and acts on the control valves 9 and 10 and the movable dam to restore the steady state (FIG. 1).

Figure 3 shows the action in the event of a flood among abnormal situations. When the water level of the upstream reservoir rises and the water level sensor 13 detects the set water level _W3 ,
Signals to close the control valve 9, open the movable gate 12, and open the control valve 10 are issued, and water flow through the water pipe 7 is stopped, and water is taken from the downstream water intake 6 and flows into the main discharge channel 8.
will be introduced to

In this case as well, when the water level drops and the water level sensor no longer senses an abnormality, the signal stops and the steady state shown in FIG. 1 is restored.

[Example] Figures 1 to 4 show examples of the invention of the present application,
Figure 4 is a perspective view of the entire device, showing the upstream reservoir 3.
A dustproof screen 19 is installed upright.

Next, the upstream dam 1 has fixed gates 11 provided as concrete weirs on both the left and right sides of the reservoir, and a movable gate 12 sandwiched between these two gates in the center of the flow path.

In this embodiment, it is a rubber movable weir whose main body is a bag made of flexible elastic material (soft rubber), and communicates with a water supply and drainage pump 16 via a water supply and drainage pipe 15 that opens into the bag.

The water supply and drainage source of this pump is a water supply and drainage port 17 that opens into the downstream reservoir, and when the pump operates, water is forced into the bag to inflate it, and the inner wall of the bag is heated so that it can maintain its upright state. Keep pressing.

As other implementation means, a pneumatic fan may be attached instead of the water supply and drainage pump to raise the bag body using atmospheric pressure, or the rotatable door body may be raised and lowered electrically. (It may also be raised and lowered using a pressure cylinder.) In this example, a rotary torque method is adopted as an example of a sediment detection sensor installed in an upstream reservoir.

As shown at 14 in Figure 1, a blade that rotates at a low speed is held underwater and in a steady state only the surrounding water resistance torque is sensed, but if dirt and sand abnormally invade and accumulate, this resistance torque suddenly changes. Therefore, the presence of sediment can be detected.

This torque difference is electrically converted and a signal is generated to transmit commands to the subsequent control system of the entire device.

The water level sensing sensor 13 may be a simple float type sensor with a limiter, but in this example, a pressure type water level gauge (bubble type or electric type) that can sense more precisely is used.

This is done by installing the measuring tip underwater at a fixed position.
It detects the water level using changes in water pressure due to changes in water depth, and when the water level reaches a set value or higher, it issues a signal and sends an operation command to the control system.

The upstream control valve 9 for steady use and the downstream control valve 10 for emergency use may be ordinary butterfly valves, and the valve plates may be rotated by electric power or hydraulic pressure to open and close the valves.

The downstream dam 2 is made of an ordinary concrete weir, and includes a main waterway 8 penetrating the bottom and a door body 18 for opening and closing this waterway.

[Effect of the invention] The main discharge water device according to the invention of the present application has the above-mentioned effects, so that the downstream reservoir, which is the main reservoir (usually an existing one), is permanently suspended due to the inflow of turbid water, resulting in a clear water layer. If this is not possible, only the upstream water that has regained its clarity relatively quickly is collected in an upstream dam (usually newly constructed), and this clear water is selectively released directly downstream without mixing with the water in the downstream reservoir. This is to preserve the ayu fishing downstream.

There are many other effects as well, including the intake of water for daily use, environmental improvement, and increased value as a tourist resource.

In addition, in the event of flooding or the inflow of sediment that is common in mountainous rivers, the water intake system is quickly switched to take water in front of the original downstream dam, and the system is designed to eliminate the impact of the dam function caused by the construction of a new upstream dam. It is assembled.

That is, when sediment is abnormally deposited in the upstream reservoir, making water intake difficult and increasing turbidity, the water intake system is switched to flush away the sediment and prevent it from entering the water pipe 7.

In addition, in the event of a flood, the inflowing upstream water itself becomes turbid, so the meaning of upstream storage is lost, and the first priority is to adjust the water level and switch the water intake system to emergency use.
We will have to wait for the upstream water to become clearer.

As is clear from the above description, this device can discharge clear water extremely effectively by simply adding one more simple piece of construction to the upstream side of an existing dam reservoir.

In other words, the effects can be expected to be extremely large compared to investment.

In addition, there is no need to hire new personnel to manage this device, and in the event of an emergency, the device automatically responds without impairing the original function of the dam.

[Brief explanation of the drawing]

1, 2A and B, and 3 are front sectional views explaining the embodiment of the present invention and its operation, and 4.
The figure is a perspective view of the same embodiment, and FIGS. 5A to 5C are partial front sectional views of the prior art. 1...Upstream dam, 2...Downstream dam, 3...Upstream reservoir, 4...Downstream reservoir, 5...Upstream water intake,
6... Downstream water intake, 7... Water pipe, 8... Main discharge channel, 9, 10... Control valve, 11... Fixed gate,
12...Movable gate, 13...Water level sensor,
14... Sediment detection sensor.

Claims (1)

[Scope of utility model registration request] An upstream dam 1 and a downstream dam 2 are provided in the waterway to form an upstream reservoir 3 and a downstream reservoir 4, and an upstream water intake 5 and a downstream water intake 6 are opened in the upstream reservoir 3 and the downstream reservoir 4, respectively. is connected to the downstream dam 2 via a water conduit 7 installed at the bottom of the downstream reservoir 4.
The upstream dam 1 is connected to the main drainage channel 8 together with the downstream water intake 6, and the amount of water discharged from each intake can be adjusted by opening and closing control valves 9 and 10 attached to each intake.The upstream dam 1 has a fixed gate 11 and a movable gate 12 The upstream reservoir is equipped with a water level sensor 13 and a sediment sensor 14, which sense the water level and inflow of sediment to open and close the movable gate 12 and control valves 9 and 10. The main discharge water device of the turbid water dam reservoir that responds to the selection of water intake and controls the discharge water volume.