JP3791990B2 - Discharge method of sediment in the dam reservoir - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for discharging sediment deposited on the bottom of a dam reservoir.
[0002]
[Prior art]
The sediment deposited at the bottom of the dam reservoir not only reduces the amount of water stored in the dam and lowers the water control function of the dam, but also may cause an increase in the river bed upstream of the dam reservoir and a decrease in the river bed downstream of the dam reservoir. There is also an adverse effect on rivers.
Therefore, in order to discharge the sediment deposited on the bottom of the dam reservoir, conventionally, the water level of the dam reservoir is lowered, the bottom of the dam reservoir is exposed and the sediment is excavated with a work vehicle, or the water level is lowered by drought, etc. The bottom of the dam reservoir exposed at the time is excavated with a work vehicle and discharged outside the dam reservoir.
[0003]
[Problems to be solved by the invention]
However, the method of discharging sedimentary sediment by lowering the water level of the dam reservoir and exposing the bottom may not always discharge sedimentary sediment due to the amount of water stored in the dam reservoir and the amount of water used in each period. Moreover, in the method of discharging sedimentary sediment in the case of drought, sedimentary sediment cannot be discharged if the state of full water continues.
The present invention has been devised in view of the above circumstances, and the object of the present invention is to discharge sediment sediment in a dam reservoir that can discharge sediment sediment at any time regardless of the amount of water stored in the dam reservoir, the amount of water used, etc. It is to provide a method.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a method for discharging sediment deposited on the bottom of a dam reservoir, wherein a cylinder is placed in the dam reservoir, its lower end is driven into the sediment of the dam reservoir, and its upper end is A plurality of earth and sand intakes are provided in a portion where the cylinder is driven into the sediment, and a sediment sedimentation basin separated from the dam reservoir, and the cylinder is driven into the sediment An earth supply pipe that communicates with the portion of the cylinder, an air supply pipe that communicates with the portion of the earth discharge pipe that is closer to the cylinder, and an upper end of the air supply pipe that protrudes above the water surface. Provide a weight that slidably moves inside, open the earth and sand intake, and close the air supply pipe, and move the weight upward from the bottom of the cylindrical body to take in the earth and sand Deposit from mouth Sand is allowed to flow out into the cylinder, the earth and sand intake is closed with the weight positioned at the top of the cylinder, and the weight is lowered to move the sediment in the cylinder to the sediment discharge pipe. , Cut off the communication part of the cylinder and the earth and sand discharge pipe, insert a sphere in the part near the sedimentation basin at the earth and sand discharge pipe part connected to the air supply pipe, and then send compressed air from the air supply pipe into the earth and sand discharge pipe And the earth and sand are moved through the earth and sand discharge pipe through the sphere and discharged to the settling basin.
[0005]
Further, the present invention is characterized in that the spherical body is inserted using compressed air from an air supply pipe.
Further, in the present invention, a sphere insertion pipe is erected in the vicinity of the sedimentation basin in the vicinity of the sediment discharge pipe communicated with the air supply pipe, and is connected to the sediment discharge pipe. It is carried out using compressed air from the sphere insertion pipe, and after the sphere is inserted into the earth and sand discharge pipe, the part where the sphere insertion pipe faces the earth and sand discharge pipe portion is blocked.
Further, the present invention is characterized in that the cylindrical body is erected in the vicinity of the dam dam body.
Further, the present invention is characterized in that the communication portion between the cylinder and the earth and sand discharge pipe is blocked by the weight being located at the cylinder portion where the earth and sand discharge pipe is communicated.
Further, the present invention is characterized in that a stirring blade is provided at the lower end of the weight, and the stirring blade is rotated when the weight is lowered.
[0006]
In the present invention, the weight is moved upward from the lower part of the cylinder by, for example, a winch in a state where the earth and sand intake is opened and the air supply pipe is closed. As a result, the accumulated sediment flows out from the sediment intake into the cylindrical body.
If the weight is positioned at the upper part of the cylinder, the earth and sand intake is closed, the lifting force of the winch is released, and the weight is lowered, for example, by its own weight. Thereby, the sediment in the cylinder is moved from the cylinder to the sediment discharge pipe.
In addition, if a stirring blade is provided and rotated at least when the weight is lowered, the accumulated sediment is hard to be solidified and is smoothly moved to the sediment discharge pipe.
If the weight is located at the lower part of the cylinder, the communicating part of the cylinder and the sediment discharge pipe is shut off, the air supply pipe is opened, the sphere is introduced into the air supply pipe, for example, and the sphere is put into the earth by compressed air. Insert into the sediment in the discharge pipe.
Then, by supplying further compressed air to the air supply pipe, the spheres are pushed into the sedimentation basin side in the sediment discharge pipe, and the sedimentary sediment is moved to the sedimentation basin side through the compressed air and the spheres. , Drain the sphere.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, examples of the present invention will be described.
FIG. 1 is a sectional side view of a dam reservoir in which the method of the present invention is carried out, and FIG. 2 is a plan view thereof.
Reference numeral 2 is a dam reservoir, 4 is a dam body, 6 is a sedimentation basin provided upstream of the dam reservoir 2, and 8 is a muddy water treatment facility provided adjacent to the sedimentation basin 6.
In the method for discharging sediment sediment according to the present invention, a cylinder 12, a sediment discharge pipe 14, a weight 16, an air supply pipe 18, a sphere 20 and the like are used.
For example, a steel pipe is used as the cylindrical body 12, and the cylindrical body 12 is erected vertically in the vicinity of the bank body 4 and is supported by a support member 22 provided between the bank body 12. The lower portion of the cylindrical body 12 is driven into sedimentary sediment (silt layer) 24 deposited on the bottom of the reservoir 2, and the upper end protrudes above the water surface.
[0008]
A plurality of earth and sand intakes 26 are provided at intervals in the circumferential direction and the vertical direction at a portion where the cylinder 12 is embedded in the sedimentary sediment 24 and the vicinity thereof, and each earth and sand intake 26 is a cylinder. 12 can be opened and closed by a cover plate (not shown) disposed on the outer peripheral surface.
One end of the earth and sand discharge pipe 14 is connected to a portion near the lower end of the cylinder 12 below the earth and sand intake 26 through a communication port 28, and the earth and sand discharge pipe 14 is connected to the bottom of the dam reservoir 2. It is buried and exposed to the surface of the ground near the sedimentation basin 6 while gradually rising as it leaves the communication port 28, and the other end is located on the sedimentation basin 6.
[0009]
The weight 16 is inserted into the cylindrical body 12.
In this embodiment, a winch and an arm 30 are provided on the bank body 4, and a wire 32 wound around the winch is inserted into the cylindrical body 12 through a plurality of pulleys provided on the arm 30, and the weight 16 is It is suspended in the cylinder 12 via the wire 32.
The outline of the weight 16 has a circular shape in plan view corresponding to the inner diameter of the cylindrical body 12, and the outer periphery of the weight 16 is formed so as to slide on the inner peripheral surface of the cylindrical body 12. It is formed in a vertical dimension that closes the communication port 28 in a state where it descends and faces the communication port 28.
A stirring blade 34 is provided below the lower end surface of the weight 16.
The stirring blade 34 is configured to be rotated by a driving mechanism such as a motor or a gear mechanism provided in the weight 16. The power supply to the motor may be performed from above the bank body 4 through a power cord, or may be performed from a battery provided inside the weight 16.
[0010]
The air supply pipe 18 communicates with the portion close to the cylindrical body 12 of the earth and sand discharge pipe 14 and is erected vertically, and is supported by a support member provided between the dam body 4. An open / close valve 36 that opens and closes the air supply pipe 18 is provided at an upper portion of the location where the air supply pipe 18 communicates with the sediment discharge pipe 14. The on-off valve 36 is located in the air supply pipe 18 by the driving means so as to shut off the air supply pipe 18 and is retracted from the air supply pipe 18 to open the air supply pipe 18. ing.
The sphere 20 is formed in a spherical shape from a material that can be expanded and contracted, such as sponge, and is inserted into the air supply pipe 18, and the sphere 20 is disposed in the air supply pipe 18 and the earth and sand discharge pipe 14. For example, as shown in FIG. 1, when the inner diameter of the air supply pipe 18 is larger than the inner diameter of the earth and sand discharge pipe 14, as shown in FIG. As shown, the spherical body 20 compressed in the air supply pipe 18 by compressed air is further compressed in the earth and sand discharge pipe 14 to have a small diameter as shown by (f) in FIG.
Further, a convex portion 38 bulges and is formed on the bottom surface of the inner surface of the sediment discharge pipe 14 to which the air supply pipe 18 is connected, and the sphere 20 inserted into the air supply pipe 18 is compressed into the sediment discharge pipe 14 by compressed air. When moving to the position, the convex portion 38 is configured to deviate from the axis of the air supply pipe 18 to the sedimentation basin 6 side in the sediment discharge pipe 14.
[0011]
Next, a procedure for discharging the sediment deposited on the bottom of the reservoir using the cylindrical body 12, the sediment discharge pipe 14, the weight 16, the air supply pipe 18, the sphere 20 and the like as described above will be described.
First, in the state where the earth and sand intake 26 is opened and the air supply pipe 18 is closed by the on-off valve 36, as shown in FIGS. Is moved upward from the lower part of the cylindrical body 12.
As a result, fluidized or semi-fluid deposited sediment 24 flows out from the sediment intake 26 into the cylinder 12. That is, since the lower part of the cylinder 12 is communicated with the atmosphere by the earth and sand discharge pipe 14, the accumulated earth and sand 24 is caused by the water pressure applied to the earth and sand 24 and the suction force caused by the upward movement of the weight 16. 12 flows out into the interior.
Next, as shown in FIG. 1 (A), the earth and sand intake 26 is closed with the weight 16 positioned at the upper end of the cylindrical body 12, the lifting force of the winch is released, and the weight 16 is lowered by its own weight. .
As a result, the accumulated sediment 24 that has flowed into the cylinder 12 is moved from the communication port 28 to the sediment discharge pipe 14.
The stirring blade 34 is rotated at least when the weight 16 is lowered. As a result, the accumulated sediment 24 sucked into the cylindrical body 12 is agitated and smoothly moved from the communication port 28 to the sediment discharge pipe 14 without being hardened.
[0012]
Next, as shown by (c) in FIG. 1, when the weight 16 is positioned below the cylindrical body 12, the lowering of the weight 16 is stopped by the winch.
In this state, the weight 16 faces the communication port 28, closes the communication port 28, and the communication portion between the cylinder 12 and the sediment discharge pipe 14 is blocked.
Further, the stirring blade 34 is located on the bottom surface of the cylindrical body 12 inside the cylindrical body 12.
Next, the opening / closing valve 36 is opened, the sphere 20 is put into the air supply pipe 18, the sphere 20 is moved below the air supply pipe 18 by the compressed air, and further, in the accumulated sediment 24 in the sediment discharge pipe 14. insert. In this case, since the convex portion 38 is provided, the sphere 20 is inserted into the earth and sand discharge pipe 14 at a location displaced closer to the sedimentation basin 6 than the axis of the air supply pipe 18.
Further, by supplying further compressed air to the air supply pipe 18, the sphere 20 is pushed into the sedimentation basin 6 side in the sediment discharge pipe 14, whereby the sedimentary sediment 24 is compressed via the compressed air and the sphere 20. 6 and the sedimentary sediment 24 and the sphere 20 are discharged into the settling basin 6.
[0013]
If the accumulated sediment 24 and the sphere 20 in the sediment discharge pipe 14 are discharged to the sedimentation basin 6, the sediment intake 26 is opened and the air supply pipe 18 is closed by a winch in the same procedure as described above. The weight 16 is moved upward from the lower part of the cylinder 12 to allow the sediment 24 to flow into the cylinder 12 from the earth and sand intake 26, and then the earth and sand intake 26 is closed and the weight 16 is lowered by its own weight. Then, the sedimentary sediment 24 is moved to the sediment discharge pipe 14, the sphere 20 is put into the air supply pipe 18, and the sedimentary sediment 24 is discharged to the sedimentation basin 6 through the compressed air and the sphere 20.
And the sedimentation sediment 24 is discharged | emitted to the sedimentation basin 6 by repeating such a procedure. The turbid water in the sedimentation basin 6 is purified by the turbid water treatment facility 8, and the purified water is discharged to the upstream location of the reservoir 2.
[0014]
Therefore, according to the present embodiment, since the sediment 24 deposited at the bottom of the reservoir 2 is discharged using the cylinder 12, the sediment discharge pipe 14, the weight 16, the air supply pipe 18, the sphere 20 and the like, the dam reservoir 2 Regardless of the amount of water stored, the amount of water used, etc., it is possible to reliably discharge the sediment 24 at any time.
And the equipment comprising the cylindrical body 12, the sediment discharge pipe 14, the weight 16, the air supply pipe 18 and the like for discharging sedimentary sediment 24 may be installed when a dam is newly installed, or an existing dam is installed. Can be easily installed, and can be widely applied to all dams regardless of whether they are new or existing.
[0015]
In addition, although the Example demonstrated the case where the spherical body 20 was thrown in from the air supply pipe | tube 18, it was made to communicate with the earth and sand discharge pipe 14 in the part near the sedimentation basin 6 near the sediment discharge pipe 14 connected with the said air supply pipe 18. The sphere insertion tube may be erected, and the sphere 20 may be inserted into the earth and sand discharge pipe 14 using compressed air from the sphere insertion pipe. After the sphere 20 is inserted into the earth and sand discharge pipe 14, the sphere insertion is performed. The part where the pipe faces the earth and sand discharge pipe 14 is closed by an on-off valve. When this spherical insertion tube is used, the convex portion 36 is omitted.
In the embodiment, the case where the communication port 28 is closed by the weight 16 while the sedimentary sediment 24 is moved in the sediment discharge pipe 14 by compressed air has been described, but an on-off valve for opening and closing the communication port 28 is provided, The communication port 28 may be closed by this on-off valve.
[0016]
【The invention's effect】
As is apparent from the above description, the present invention is a method for discharging sediment deposited on the bottom of a dam reservoir, in which a cylinder is placed in the dam reservoir and its lower end is driven into the sediment sediment of the dam reservoir and its upper end is A plurality of earth and sand intakes are provided in a portion where the cylinder is driven into the sediment, and a sediment sedimentation basin separated from the dam reservoir, and the cylinder is in the sediment A sand discharge pipe communicating with a portion driven into the pipe, an air supply pipe connected to a portion of the sediment discharge pipe close to the cylinder, and an upper end of the air supply pipe projecting above the water surface are provided. By providing a weight that slidably moves inside the body, opening the earth and sand intake, and closing the air supply pipe, the weight is moved upward from the bottom of the cylindrical body. From the earth and sand intake The sediment is discharged to the inside of the cylinder, the earth and sand intake is closed while the weight is located at the top of the cylinder, and the weight is lowered to move the sediment in the cylinder to the sediment discharge pipe. Block the communication part between the cylinder and the earth and sand discharge pipe, insert a sphere near the sedimentation basin at the earth and sand discharge pipe part connected to the air supply pipe, and then discharge compressed air from the air supply pipe. It was supplied to the inside of the pipe, and the earth and sand were moved through the earth and sand discharge pipe through the sphere to be discharged to the settling basin.
Therefore, the sediment can be reliably discharged at any time regardless of the amount of water stored in the dam reservoir, the amount of water used, etc., and the sediment can be removed using a cylinder, sediment discharge pipe, weight, air supply pipe, etc. Therefore, facilities for discharging sediment sediment may be installed at the time of new dam construction, or can be easily installed in existing dams, and can be widely applied to all dams.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of a dam reservoir in which the method of the present invention is implemented.
FIG. 2 is a plan view of a dam reservoir in which the method of the present invention is implemented.
[Explanation of symbols]
2 Dam reservoir 4 Dyke body 12 Tube body 14 Sediment discharge pipe 16 Weight 18 Air supply pipe 20 Sphere

Claims (6)

A method for discharging sediment deposited on the bottom of a dam reservoir,
Put the cylinder in the dam reservoir, and erected the lower end of the dam reservoir into the sediment of the dam reservoir while projecting the upper end above the water surface.
A plurality of earth and sand intakes are provided in the portion where the cylinder is driven into the sediment,
A sediment discharge pipe is provided that communicates the sediment sedimentation pond separated from the dam reservoir and the portion where the cylinder is driven into the sediment.
While providing an air supply pipe communicated with the portion of the earth and sand discharge pipe closer to the cylindrical body, the upper end of the air supply pipe protrudes above the water surface,
Provide a weight that slidably moves inside the cylinder,
With the earth and sand intake opening opened and the air supply pipe closed, the weight is moved upward from the bottom of the cylinder to cause sediment sediment to flow out from the earth and sand intake to the inside of the cylinder. ,
The earth and sand intake is closed in a state where the weight is located at the upper part of the cylinder, and the weight is lowered to move the sediment in the cylinder to the earth and sand discharge pipe,
Blocking the communicating part of the cylinder and the earth and sand discharge pipe, inserting a sphere in the part near the sedimentation basin in the earth and sand discharge pipe part communicated with the air supply pipe,
Then, compressed air was supplied from the air supply pipe into the earth and sand discharge pipe, and the earth and sand were moved through the sphere to move inside the earth and sand discharge pipe and discharged into the sedimentation basin.
A method for discharging sedimentary sediment from a dam reservoir. 2. The method for discharging sedimentary sediment in a dam reservoir according to claim 1, wherein the insertion of the sphere is performed using compressed air from an air supply pipe. In the vicinity of the sediment discharge pipe communicated with the air supply pipe, a sphere insertion pipe is erected in the vicinity of the sedimentation basin and communicated with the sediment discharge pipe. The insertion of the sphere into the sediment discharge pipe is compressed from the sphere insertion pipe. The method for discharging sedimentary sediment in a dam reservoir according to claim 1, wherein the method is carried out using air, and after the sphere is inserted into the sediment discharge pipe, the part of the spherical insertion pipe facing the sediment discharge pipe is closed. The method for discharging sediment sediment in a dam reservoir according to claim 1, wherein the cylindrical body is erected in the vicinity of a dam dam body. The method for discharging sedimentary sediment in a dam reservoir according to claim 1, wherein the communication portion between the cylindrical body and the sediment discharge pipe is blocked by the weight being located at a cylindrical section where the sediment discharge pipe is communicated. 2. The method for discharging sediment sediment in a dam reservoir according to claim 1, wherein a stirring blade is provided at a lower end of the weight, and the stirring blade is rotated when the weight is lowered.

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