JP2000297420A - Sand moving method and device for storage dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sand moving method and a device for a storage dam capable of executing long distance transpotation by simple structure. SOLUTION: An upstream end is opened to sedimentary sand 3 on the bottom of a storage dam, a sand moving pipe 4 opened to a sedimentary sand conveyance and supply objective land located at a position lower than the bottom of the storage dam, a sand moving pipe 4 opened to a sedimentary sand conveyance and supply objective land locating a downstream end extending across a weir body 1 at a position lower than the bottom of the storage dam is laid through a spillway 9 of the weir body 1, a gate 12 of the spillway 9 is closed to raise a reservoir level W.L to the height higher than a maximum element of the sand moving pipe 4 to fill the inside of the sand moving pipe 4 with flowing water, the gravity flow of water caused by difference in pressure between the upstream end and downstream end of the sand moving pipe 4 is made to occur, and the sedimentary sand 3 is sucked from the upstream end of the sand moving pipe 4 brought into contact with the sedimentary sand 3 by the flowing water to eliminate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for discharging sand from a water storage dam.

[0002]

2. Description of the Related Art Sediment accumulates on the bottom of a water storage dam into which sediment flows together with river water from upstream.

The condition of sedimentation in which sediment accumulates varies depending on the conditions of storage dam basins such as the state of sedimentation and the composition of grain size in the basin, the number of years elapsed since the construction of the storage dam, and weather conditions. When approaching the altitude at the top of the main body, the effective storage capacity of the reservoir dam decreases, deteriorating the environment in the upstream basin,
It is feared that sedimentation on the bottom of a storage dam will cause the function of the storage dam to deteriorate, and cause various adverse effects, for example, the downstream area will be greatly damaged during rainfall.

[0004] Therefore, various sand discharging devices have been conventionally provided.

[0005] For example, a vortex sand discharge pipe that sucks water and sand through a narrow slit provided in a part of a pipe and discharges earth and sand by using the action of a vortex formed in the pipe, or a water storage level by gate operation. Sand pump system or sand pump to reduce the water flow and to provide appropriate tractive force in the water storage dam.

[0006]

However, the above-mentioned various sand discharging devices require a great deal of power, and can only remove sediment near the top of the dam body of the water storage dam. It is difficult to effectively use sand collected from water storage dams as sand and small aggregates to be mixed with cement, etc. It is.

Further, when the water surface and the sedimentary surface of the storage dam are located at a position lower than the top of the dam body and the altitude difference is large, an extremely large amount of power is required as sand discharging means. However, there is a problem in that it is difficult to attach a sand discharging device to the apparatus, and a large amount of money and labor are required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a method and an apparatus for discharging sand from a water storage dam that can be transported over a long distance with a simple structure.

[0009]

According to a first aspect of the present invention, there is provided a method for discharging sand from a dam, the upstream end of which is open to the sediment at the bottom of the water storage dam, and A sand drain pipe whose downstream end extending beyond the top is open to the sediment supply target site located at a position lower than the bottom of the water storage dam is laid through the spillway of the dam body, and the spillway gate is opened. By closing and raising the water storage level to a height equal to or higher than the highest point of the sand discharge pipe, the water is introduced into the sand discharge pipe to fill the inside of the pipe, and the gap between the upstream end and the downstream end of the sand discharge pipe The natural flow of water caused by the pressure difference is caused, the upstream end opening of the sand discharge pipe contacts the sediment, the natural flow of water into the sand discharge pipe sucks the sediment into the sand discharge pipe, and the sand discharge pipe From the downstream end opening.

According to a second aspect of the present invention, there is provided a dam sand discharging device, wherein a curved pipe member is disposed at the bottom of the spillway so as to straddle the top of the dam body, and the base end is the curved pipe member. A suction pipe member air-tightly connected to the upstream end of the water storage dam and having a tip extending into the water opening to the sediment at the bottom of the reservoir dam, and a base end air-tightly connected to the downstream end of the curved pipe member to be outside the dam. And a suction pipe oscillating means for oscillating a portion near the upstream end of the sand discharge pipe. Prepare.

In any of the method for discharging sand from a water storage dam according to the first aspect of the present invention and the method for discharging water from a water storage dam according to a second aspect of the present invention, the inside and outside of the water storage dam are communicated across the top of the main body of the dam. The natural flow of water caused by the pressure difference between the upstream end and the downstream end in the sand discharge pipe absorbs and eliminates sediment at the bottom of the reservoir dam.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 6 show an embodiment of a sand discharging device for a water storage dam according to the present invention, wherein 1 is a dam body, 2 is a reservoir (dam water), 3 is sediment, and 4 is sediment. It is a sand drain.

The sand discharge pipe 4 is air-tightly connected to a curved pipe member 5 arranged so as to straddle the top of the embankment main body 1 via a flexible pipe member 6 at the upstream end of the bent pipe member 5 and extends into the water. It is composed of a suction pipe member 7 and a discharge pipe member 8 connected to the downstream end of the curved pipe member 5 and extending outward from the dam body 1.

As shown in FIG. 3, the curved pipe member 5 has a shape in which one end is bent obliquely downward and the other end is bent substantially vertically downward, and is provided at the top of the dam body 1. Spillway 9
The one end bent obliquely downward is directed toward the inside (upstream side) of the dam body, and the straight pipe portion 5a is substantially horizontal or the outer end of the dam body 1 (A downstream end portion) is disposed so as to be slightly lower, the outer periphery of the straight pipe portion 5a is covered with a packing member 10 such as a soft rubber sheet, and the lower outer surface of the packing member 10 is 9 Adhere to the nectar with concrete between the lower part.

Above the curved pipe member 5 fixed to the spillway 9, there is provided a gate 12 which moves up and down along a gate guide 11, and as shown in FIG. It is formed so as to be able to adhere to the pipe member 5 via the packing member 10, and the spillway 9 can be completely shut off when the gate 12 is closed.

The flexible tube member 6 is made of thick rubber and has a bellows shape which can sufficiently withstand the effects of the weight of the suction tube member 7 and the sand flow flowing in the tube, and the stress of the suction tube member 7 caused by wind and water pressure. And the base end is air-tightly connected to the end (upstream end) of the curved pipe member 5 facing the inward side of the bank body 1.

The suction pipe member 7 has a length whose base end is air-tightly connected to the front end (upstream end) of the flexible tube member 6 and whose front end extends into the water storage 2 and reaches the sediment 3.

The tip of the suction pipe member 7 is open to the sediment 3 and is configured to be able to swing up, down, left and right by suction pipe swing means 13 described later.

The discharge pipe member 8 is air-tightly connected to an end (downstream end) of the bent pipe member 5 facing the outside of the dam body 1 and has a distal end outward of the dam body 1. It has a length that extends to a sediment feeding site (not shown), and the tip is open to the sediment feeding site.

The suction pipe swinging means 13 is disposed upward from the vicinity of the distal end of the suction pipe member 7 and has a turret 15 provided with a sliding shoe 14 at its lower end, and a pulley 16 disposed at the top of the turret 15. And a hoisting rope 17 wound around the pulley 16. One end of the hoisting rope 17 is connected to the vicinity of the distal end of the suction pipe member 7, and the other end of the hoisting rope 17 is not shown. Winding around the upper drum, the winding drum is rotated forward and reverse, and the winding rope 17 is wound up or paid out as the winding drum rotates, so that the distal end of the suction pipe member 7 moves up and down with the bending of the flexible pipe member 6. It is configured to swing.

Further, two moving ropes 18 each having one end connected to the lower part of the tower 15 are extended from the tower 15 in the left-right direction, and a plurality of falling ropes 19 each having one end connected to the upper part of the tower 15. Are stretched in all directions around the tower 15, and these other ends of the moving rope 18 and the fall prevention rope 19 are
Each of them is wound around a moving drum (not shown), and the moving drum is rotated in the normal and reverse directions, and the moving rope 18 and the fall-preventing rope 19 are wound or fed out with the rotation of the moving drum. The turret 15 moves together with the sliding shoe 14 that slides upward, and the tip of the suction pipe member 7 is configured to move in either the left or right direction.

The turret 15 is a two-piece turret 15a composed of two pillars 20 and a plurality of structural members 21 as shown in FIG. 5, or a four-piece turret 15 as shown in FIG. It is a matter of course that any of the so-called lantern towers 15b constituted by the pillar members 20 and the plurality of fine members 21 may be used. It is advantageous to use a folding screen tower (not shown).

The above-mentioned curved pipe member 5, suction pipe member 7,
It is desirable that each pipe member such as the discharge pipe member 8 has a pipe diameter capable of performing an obstacle removing operation in consideration of a case where rocks or gravel are clogged in the pipe and natural flow in the pipe is obstructed.

The material of each tube member is a cast aluminum tube,
Cast iron pipes and high-pressure reinforced concrete pipes are considered to be good.

When the sediment 3 is removed from the water storage dam by the sand discharge device of the water storage dam shown in FIGS. 1 to 6, the gate 12 of the spillway 9 is closed and the highest part of the sand discharge pipe 4 ( (Where the bent pipe member is fixed) Increase L.

Water level W. As the L rises, the inside of the suction pipe member 7 is filled with the flowing water flowing from the distal end opening of the suction pipe member 7, and the flowing water then flows into the curved pipe member 5 of the sand discharging pipe 4.
Through the discharge pipe member 8.

For the water that fills the inside of the sand discharge pipe 4 and flows down, the upstream end (the end side of the suction pipe member 7) and the downstream end (the end side of the discharge pipe member 8) of the sand discharge pipe 4. A pressure difference occurs between the two, and a natural flow of water is caused inside the sand discharge pipe 4 due to the pressure difference.

Thereafter, the hoisting rope 17 is paid out from a hoisting drum (not shown), the tip of the suction pipe member 7 is lowered, and the tip of the suction pipe member 7 is brought into contact with the sediment 3. It flows into the pipe from the opening of the member 7, flows through each of the suction pipe member 7, the flexible pipe member 6, the curved pipe member 5, and the discharge pipe member 8 which constitute the sand discharging pipe 4, and opens the discharge pipe member 8. Is released to the sediment supply target area.

It should be noted that the sediment 3 discharged at the sediment feeding target area
Although the water flow including the seawater varies depending on the altitude of the place where the storage dam occupies and the elevation of the sediment supply target area with respect to the height of the dam body 1, it has a very large flow velocity. It is necessary to expect.

In order to stop the removal of the sediment 3 from the water storage dam, the hoisting rope 17 is wound around the hoist drum, and the tip of the suction pipe member 7 is separated from the sediment 3. The flow of the sand 3 is stopped.

In order to stop the outflow of the water storage 2 from the water storage dam, the hoisting rope 17 is further wound around the hoisting drum, so that the tip of the suction pipe member 7 is moved to the water level W.W. If it is wound up to a position above L, the inflow of the water 2 into the suction pipe member 7 stops.

Further, when the sediment removal position of the water storage dam is moved to another position, the moving drum (not shown) is rotated in the normal and reverse directions, and the moving rope 18 accompanying the rotation of the moving drum and the fall prevention rope are rotated. By taking up or feeding out 19, the tower 15 is moved together with the sliding shoe 14 sliding on the sediment 3, and the tip of the suction pipe member 7 is moved to a required position.

As described above, according to the embodiment of the sand discharge device of the water storage dam shown in FIGS. 1 to 6, the suction pipe member 7, the flexible pipe member 6, the curved pipe member 5, and the discharge pipe member 8 are provided. Is fixed to the spillway 9 of the dam body 1, and the inside and outside of the water storage dam are communicated by the sand discharge pipe 4, and the gate 12 of the spillway 9 is connected. Is closed and the water level W. By raising L, the inside of the sand discharge pipe 4 is filled with the water 2 flowing from the opening of the suction pipe member 7, and the natural water caused by the pressure difference between the upstream end and the downstream end of the sand discharge pipe 4. Since the flow is induced and the sediment 3 at the bottom of the water storage dam is sucked and removed by being put on the running water, the sand sediment 3 does not require a special suction power and has a simple structure. Long-distance transportation becomes possible.

In addition, since the sand discharge from the water storage dam to a remote place can be carried, the sand discharged from the water storage dam can be commercialized as sand and small aggregate for the purpose of being mixed with cement or the like and used effectively. It will be easier.

When implementing the sand discharging method and apparatus of the present invention, always take care of the situation on the upstream side of the dam and take care not to cause secondary disaster even if the sediment flow (debris flow) flows downstream. It is necessary to be careful that if the tip of the suction pipe is rushed too much into the sediment so that the sediment is clogged in the pipe, the removal of the sediment is rushed.

The method and apparatus for discharging sand from a water storage dam according to the present invention are not limited to the above-described embodiment, but correspond to the illustrated curved pipe member 5, flexible pipe member 6, and suction pipe member 7. The portion may be integrally formed in advance with a rubber material or a material similar thereto, and the portion corresponding to the flexible tube member may be configured to retain flexibility, otherwise, within a range not departing from the gist of the present invention. Of course, various changes can be made.

[0038]

As described above, according to the method and apparatus for discharging sand from a water storage dam of the present invention, the following various excellent effects can be obtained.

(1) In any of the method and the apparatus for discharging sand from a water storage dam according to claim 1 or 2, the upstream end is opened to the sediment at the bottom of the water storage dam and extends beyond the top of the dam. A sand drainage pipe whose downstream end is open to the sediment supply target area at a position lower than the bottom of the water storage dam is laid at the bottom of the spillway of the dam body, and the spillway gate is closed. Raises the water storage surface to a height higher than the highest point of the sand discharge pipe to fill the inside of the sand discharge pipe with running water, and causes the natural flow of water due to the pressure difference between the upstream end and the downstream end of the sand discharge pipe. The sediment can be sucked and removed from the upstream end of the sand discharge pipe that is brought into contact with the sediment by the running water. Therefore, no special suction power is required as a sand discharging device, and the structure is simple. Long-distance transportation is possible.

(2) In addition, since the sand discharge from the water storage dam can be transported to a remote place, the sand discharged from the water storage dam is commercialized as sand and small aggregate for the purpose of mixing with cement or the like, and is effectively used. It becomes easy to do.

(3) Further, if the method and apparatus for discharging sand from a water storage dam according to claim 1 or 2 of the present invention are effectively used, improvement of swamp ground, reclamation of coasts, creation of airfields, etc. It is possible to prevent noise, beautify the river environment,
It can help to improve the global environment.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a sand discharge device of a water storage dam according to the present invention.

FIG. 2 is a plan view related to FIG. 1;

FIG. 3 is an enlarged view of a curved tube member fixing portion related to FIG. 1;

4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a front view of an example of the tower related to FIG. 1;

FIG. 6 is a perspective view of another example of the tower related to FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 dam main body 2 water storage (dam water) 3 sedimentation 4 sand drainage pipe 5 curved pipe member 6 flexible pipe member 7 suction pipe member 8 discharge pipe member 9 spillway 12 gate 13 suction pipe swing means W. L water level

Claims (2)

[Claims] 1. An upstream end is open to the sediment at the bottom of a storage dam, and a downstream end extending beyond the top of a dam body is located at a lower position than the bottom of the storage dam. The open sand drainage pipe is laid through the spillway of the embankment body, and the spillway gate is closed to raise the water storage level to a height higher than the highest point of the sand drainage pipe, thereby storing water in the sand drainage pipe. To fill the inside of the pipe, cause natural flow of water due to the pressure difference between the upstream end and the downstream end of the sand discharge pipe, and contact the upstream end opening of the sand discharge pipe with the sediment. A method for discharging sand from a water storage dam, wherein sediment is sucked into the sand discharge pipe by natural flow of water into the sand discharge pipe and discharged from a downstream end opening of the sand discharge pipe. 2. A curved pipe member arranged at the bottom of the spillway so as to straddle the top of the dam body, and a distal end portion whose base end is airtightly connected to the upstream end of the curved pipe member and extends into the water is provided with a reservoir. A suction pipe member that opens to the sediment at the bottom of the dam, a base end of which is airtightly connected to a downstream end of the curved pipe member and extends outside the dam, and a tip end of the suction pipe member with respect to the sediment feeding target area. A sand discharging device for a water storage dam, comprising: a sand discharging pipe constituted by an opening discharge pipe member; and a suction pipe rocking means for rocking a portion near the upstream end of the sand discharging pipe.