JP3347104B2 - Sand removal method of reservoir and sand removal equipment of reservoir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for discharging sand from a reservoir and a facility for discharging sand from the reservoir.

[0002]

2. Description of the Related Art There are many dams nationwide, and one of the problems in dam management is sedimentation. As the sedimentation progresses, the dam will no longer function. As a countermeasure, dredging was carried out by floating a boat on a reservoir when sedimentation had accumulated.

[0003] Since dredging is not very efficient, a sand dump gate is set up at the bottom of the dam, from which the water level of the dam reservoir is lowered to near Kalappo to discharge sediment deposited in the reservoir, so-called gate sand dumping. Had been done.

Further, a weir is provided upstream of the reservoir of the dam,
The concept of so-called bypass sand drainage in Japan and overseas examples of connecting the upstream of the weir and the downstream of the dam with a bypass channel tunnel and discharging the inflow sediment downstream of the dam through the bypass channel tunnel have been known. there were.

[0005]

In the bypass sand discharge, the flow rate of the main river increases, the bed load flowing into the bypass channel tunnel increases, and the bypass channel tunnel may be blocked.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been developed in order to prevent the flow rate of the main river from increasing, the bed load flowing into the bypass channel tunnel from increasing, and the bypass channel tunnel from being blocked. A reservoir is provided upstream of a reservoir made by damming the river with dams, the upstream of the weir and the downstream of the dam are connected by a bypass channel tunnel, and sediment from the upstream is discharged to the downstream of the dam, bypassing the dam. In the sand drainage method, the hanging wall is erected downward from the top at the mouth of the bypass channel tunnel, the weir is raised, and the water level upstream of the weir is raised by the weir and the hanging wall, so that the sediment is gradually removed. Inflow was made to prevent the bypass channel tunnel from being blocked, and a sand removal method for the reservoir was adopted.

Further, the present invention provides a weir provided upstream of a reservoir constructed by damming a river, connecting the upstream of the weir and the downstream of the dam with a bypass channel tunnel, and transferring sediment transported from the upstream to the dam. In a sand drainage facility for a reservoir that bypasses and discharges downstream of a dam, a hanging wall is erected downward from the top at the mouth of the bypass channel tunnel, and an air hole that connects the bypass channel tunnel and the ground surface downstream of the hanging wall. In order to temporarily store bed load by raising the weir, when the water level of the bed rises, the stored bed load flows into the bypass channel tunnel, and the bypass channel tunnel is blocked by bed sand. Sand drainage equipment for the reservoir to prevent the occurrence of water.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings.

In FIG. 1, a river 1 is dammed by a dam 2, and a reservoir 3 is located upstream of the dam 1.

A weir 4 is provided upstream of the reservoir 3.

The upstream of the weir 4 and the downstream of the dam 2 are connected by a bypass channel tunnel 5. The mouth 6 of this bypass channel tunnel 5 is a part which takes in water from the river 1,
The spout 7 is a part for discharging water from the bypass channel tunnel 5 to the river 1.

FIG. 2 is a longitudinal sectional view of the mouthpiece 6, and the mouthpiece 6 is opened slightly upstream of the weir 4. The spout 7 is open to the river 1 downstream of the dam 2 as shown in FIG.

In the present invention, a hanging wall 11 is erected from the upper part of the mouth 6 of the bypass channel tunnel 5 downward. The hanging wall 11 covers the upper part of the drinking mouth 6 and the lower part is opened so that water from the river 1 can flow in.

An air hole 12 is provided downstream of the hanging wall 11 so that water can easily flow through the bypass channel tunnel 5. In the illustrated example, it is provided immediately after the hanging wall 11. When water flows into the bypass channel tunnel 5, the air holes 12 have an air layer 14 interposed therebetween to facilitate the flow of water. When the water flows, the air is drawn from the air holes 12 and an air layer 14 intervenes above the water. If there is no air layer 14 above the water in the bypass channel tunnel 5, the water will not easily flow in the bypass channel tunnel 5.

Further, there is provided a sand storage weir 13 for temporarily storing the sediment transported from the upstream by the river 1 with the weir 4 raised. Reference numeral 15 is a gate.

Next, the bypass sand removal according to the present invention will be described based on a conceptual diagram of FIG. 4 in comparison with a conventional bypass sand removal.

In the conventional bypass sand removal, a river 1 is dammed by a dam 2, an upstream side of the dam 2 is a reservoir 3, a weir 4 is provided upstream of the reservoir 3, and a bypass is provided upstream of the weir 4 and downstream of the dam 2. They are connected by a water channel tunnel 5 (see FIG. 1), and the inflow sediment from the upstream is discharged to the downstream of the dam 2. here,
A weir 4 slightly higher than the bypass channel tunnel 5 is provided.

On the other hand, according to the present invention, a hanging wall 11 is hanged downward from the upper part of the mouth 6 of the bypass passage tunnel 5, and the air communicating with the bypass water tunnel 5 and the ground surface is provided downstream of the hanging wall 11. A hole 12 was provided, and the weir 4 was raised to form a sand storage weir 13.

Referring to FIGS. 5 to 9, a comparison will be made between the conventional bypass sand discharge and the bypass sand discharge of the present invention. In addition,
The sectional view here is a section from the weir 4 or the sand storage weir 13 to the drinking spout 6 in the plan view.

The amount of sedimentation depends on the flow rate of the river 1 and the state 1 in FIG.
Then, the flow rate of the river 1 is small and the amount of sediment is small. Then, sand is swept according to the flow rate, which is the same in the conventional and the present invention, and the sand passing capacity of the tunnel is secured.

Next, when the flow rate of the river 1 is medium in the state 2 in FIG. 6, the amount of sedimentation is also medium, and conventionally, when the amount of sedimentation increases, the sediment S advances.

In the present invention, the water level rises in front of the mouthpiece 6 due to the presence of the hanging wall 11 and the progress of sediment is suppressed, and the sweeping force of the mouthpiece 6 increases due to the rise in the water level in front of the mouthpiece 6. At this time, the sediment S disappears. This mouthpiece 6
Suppression of the progress of sediment on the front surface and the disappearance of the sediment S from the front surface of the drinking mouth 6 to the drinking mouth 6 ensure the sand passage capacity of the bypass channel tunnel 5.

In the state 3 of FIG. 7, the flow rate of the river 1 is large and the sedimentation amount is also large. is there.

According to the present invention, the presence of the sand dam 13
The water level rises in front of the drinking mouth 6, and the progress of sediment is suppressed. In the spout 6, the water level rises in front of the spout 6, so that the sweeping force becomes large and the sediment S disappears. By suppressing the progress of sedimentation in front of the mouth 6 and the disappearance of sediment from the front side of the mouth 6 to the mouth 6, the sand passage capacity of the bypass channel tunnel 5 is ensured.

In state 4 in FIG. 8, when the flow rate of the river 1 falls to the middle, the amount of sediment also becomes medium. In the related art, the inside of the bypass channel tunnel 5 is closed, and the sediment overflows the weir.

On the other hand, according to the present invention, when the water level decreases, the sweeping force increases in front of the mouth 6, the sediment S gradually disappears, the sediment gradually flows into the mouth 6, and the bypass waterway. The sand passing capacity of the tunnel 5 is continuously maintained.

In the state 5 in FIG. 9, the flow rate of the river 1 is small, and the amount of sediment is small. Conventionally, earth and sand overflow the weir and flow down the river channel.

On the other hand, according to the present invention, the sand continuously flows into the spout 6 according to the flow rate and is swept through the bypass alley tunnel 5.

As described above, according to the present invention, when the flow rate of the river 1 becomes large, the suspended sand is temporarily stored due to the existence of the hanging wall 11 and the sand storage weir 13, so that the flow rate of the river 1 becomes small. At this time, the water gradually flows into the bypass channel tunnel 5 and is discharged downstream of the dam 2.

[0030]

As described above, according to the present invention, a weir is provided upstream of a reservoir constructed by damming a river, and the upstream of the weir and the downstream of the dam are communicated by a bypass channel tunnel. This is a method of discharging sand from a reservoir that discharges sedimentation sand to the downstream of the dam, bypassing the dam.The hanging wall is erected downward from the top at the mouth of the bypass channel tunnel, the weir is raised, and the weir and the hanging wall are used. By raising the water level at the upstream of the weir, the sediment gradually flows in and the reservoir drainage method is designed to prevent the bypass channel tunnel from being blocked. Even if the sediment becomes large, the bypass channel tunnel will not be blocked, and the sand can be discharged stably.

According to the present invention, a weir is provided upstream of a reservoir formed by damming a river, and the upstream of the weir and the downstream of the dam are communicated by a bypass channel tunnel, and sediment transported from the upstream is transferred to the dam. In a sand drainage facility for a reservoir that bypasses and discharges downstream of a dam, a hanging wall is erected downward from the top at the mouth of the bypass channel tunnel, and an air hole that connects the bypass channel tunnel and the ground surface downstream of the hanging wall. In order to temporarily store bed load by raising the weir, when the water level of the bed rises, the stored bed load flows into the bypass channel tunnel, and the bypass channel tunnel is blocked by bed sand. The sediment is temporarily stored in the weir and its upstream area, and gradually flows into the bypass channel tunnel and discharges to the downstream of the dam. Never as road tunnel is closed, it can be stably Haisuna.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall outline of a bypass sand discharge according to the present invention.

FIG. 2 is a longitudinal sectional view of the drinking mouth of FIG.

FIG. 3 is a longitudinal sectional view of the spout of FIG.

FIG. 4 is a conceptual diagram of a conventional bypass sand discharge and a bypass sand discharge of the present invention.

FIG. 5 is a comparison diagram of the conventional bypass sand discharge and the bypass sand discharge of the present invention.

FIG. 6 is a comparison diagram of the conventional bypass sand discharge and the bypass sand discharge of the present invention.

FIG. 7 is a comparison diagram of the conventional bypass sand discharge and the bypass sand discharge of the present invention.

FIG. 8 is a comparison diagram of the conventional bypass sand discharge and the bypass sand discharge of the present invention.

FIG. 9 is a comparison diagram of the conventional bypass sand discharge and the bypass sand discharge of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... River 2 ... Dam 3 ... Reservoir 4 ... Weir 5 ... Bypass waterway tunnel 6 ... Inlet 7 ... Outlet 11 ... Hanging wall 12 ... Air hole 13 ... Sand storage weir 14 ... Air layer 15 ... Gate

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Kokubo 3-2-2, Nakanoshima, Kita-ku, Osaka-shi Inside Kansai Electric Power Co., Inc. (72) Inventor Masahiro Kato 3-2-2, Nakanoshima, Kita-ku, Osaka-Kansai Electric Power Co., Ltd. (72) Inventor Kazuo Ashida 1-6-4 Otemae, Chuo-ku, Osaka-shi Hana Building 7F, River Environment Management Foundation River Environment Research Institute Osaka Research Laboratory (72) Inventor Ken Saito Osaka Central 1-20-19, Shimanouchi-ku New Jec Co., Ltd. (56) References JP-A-58-178709 (JP, A) JP-A-5-331827 (JP, A) (58) Fields investigated (Int. . ⁷ , DB name) E02B 7/20 106

Claims (2)

(57) [Claims] 1. A weir is provided upstream of a reservoir constructed by damming a river, and the upstream of the weir and the downstream of the dam are communicated with a bypass channel tunnel. This is a method of discharging sand from a reservoir discharged to the downstream, where a hanging wall is erected downward from the top at the mouth of the bypass channel tunnel, the weir is raised, and the water level upstream of the weir is raised by the weir and the hanging wall. A method of discharging sand from a reservoir, in which sediment is gradually introduced to prevent a bypass channel tunnel from being blocked. 2. A dam is provided upstream of a reservoir constructed by damming a river, and the upstream of the weir and the downstream of the dam are connected by a bypass channel tunnel, and sediment transported from the upstream bypasses the dam. In the sand discharge facility of the reservoir discharged to the downstream, a hanging wall is erected downward from the top at the mouth of the bypass channel tunnel, and an air hole communicating with the bypass channel tunnel and the ground surface is provided downstream of the hanging wall. To increase the height of the bed and temporarily store bed load, so that when the water level of the bed rises, the bed load stored therein flows into the bypass channel tunnel to prevent the bypass channel tunnel from being blocked by bed load. Sand drainage equipment for the reservoir.