JP2003239260A - Selective water intake device of dam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a selective water intake device of a dam capable of reducing overall weight without using a steel-made impervious wall. <P>SOLUTION: A water intake tower 2 capable of changing a water intake height is formed of impervious walls 3a to 3d having a plurality of stages comprised of a frame 10 and a flexible membrane 11 to greatly reduce weight in comparison with the steel-made impervious wall to be used, a lifter is miniaturized, and the selective water intake device of the dam can be installed by providing a float 1 on the surface of a dam-lake. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dam selective intake device which can take water from an arbitrary water level, such as an upper layer, a middle layer or a lower layer of a dam lake, as required.

[0002]

2. Description of the Related Art A selective intake device for a dam is provided with an intake tower formed by a plurality of stages of impermeable walls that can be raised and lowered so as to surround the intake along the dam wall on the dam lake side. By raising and lowering the intake tower, the intake height can be changed from the lower layer to the upper layer of the dam lake so that water can be taken from any water level.

Using such a dam selective intake device,
When water is normally discharged or flooded, the height of the water intake tower is lowered to lower the height of the intake tower so that water begins to rise, muddy water sinks from the upper layer, and the upper layer is filled with clear water. When this happens, the height of the water intake tower is raised by raising the impermeable walls in multiple stages, and only the clear water in the upper layer is taken from the upper end of the water tower and discharged downstream.

[0004]

By the way, a multi-stage impermeable wall which can be moved up and down along the dam wall on the lake side so as to surround the intake port can withstand water pressure, The one made of steel is usually used to make the wall watertight.

However, the steel impermeable wall has a very large overall weight, and in order to move the steel impermeable wall up and down, large-scale equipment is required, the operating cost is high, and the selective water intake device is installed. There is a problem that the construction period is long and the construction cost is high.

Therefore, the present invention is intended to obtain a selective water intake device for a dam which does not use a steel impermeable wall and which can reduce the overall weight.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of steps of an ascending / descending impermeable wall forming an intake tower along a dam wall surface on the dam lake side. A pair of vertically extending guide rails are formed by a horizontally curved frame whose both ends are supported so as to be vertically movable, and a flexible film supported by the frame so as to hang down from the frame. .

As the flexible film forming the water intake tower,
A rubberized cloth or the like can be used, and by supporting this flexible film on the wall surface of the dam by a frame, the overall weight of the water intake tower can be significantly reduced.

Further, the frame has a hollow structure, and air is filled from the air tank through the air tube into the frame having the hollow structure to adjust the buoyancy, thereby further reducing the supporting weight of the entire water intake tower. can do.

The length of the flexible membrane in the vertical direction is such that when the water intake tower is raised, that is, when the frame interval of each stage is widened, the flexible membrane bends inward due to water pressure from the outside. Even when it is lifted, the lower edge of the upper flexible film has a length that overlaps with the outer lower side of the lower frame. As a result, even if the flexible film bends inward due to water pressure and the lower edge of the flexible film rises upward, the lower edge of the flexible film contacts the outer side of the lower frame, and the upper impermeable wall No water leakage space is formed between the lower end of the and the upper end of the lower impermeable wall.

It is preferable to provide a bottom impermeable wall on the bottom surface of the water intake tower composed of a plurality of stages of water impermeable walls in order to prevent the lake bottom water from being caught in the water intake tower.

Since the water intake tower according to the present invention is lightweight as described above, a float is provided on the water surface of the dam lake, and the uppermost impermeable wall of the water intake tower is hung from this float by a wire to It can be installed by installing the winding winch of the wire on the float and sequentially connecting the frames of the impermeable walls of each of the stages by a connecting chain.

Then, when the suspending wire of the hoisting winch installed on the float is extended, the impermeable wall at the uppermost stage descends, and accordingly, the impermeable walls at the lower stage connected by the connecting chain also descends sequentially. Since the frame interval is narrowed, the height of the intake tower is lowered, and water in the middle or lower layers of the dam lake can be taken according to the height of the intake tower.

On the other hand, when the turbid water settles down after increasing the water level and clear water is confirmed in the upper layer of the dam lake, and only the clear water in the upper layer is to be discharged to the downstream side, the suspension wire of the hoisting winch installed on the float is used. Winding up and pulling up the uppermost impermeable wall to the maximum, the frame interval of the impermeable walls of each stage connected by the connecting chain expands accordingly, which increases the height of the intake tower and the upper layer of the dam lake. Can take water.

In order to achieve water tightness between the flexible membrane of the impermeable wall of each stage and the dam wall surface on the dam lake side, both side edges of the flexible membrane forming the impermeable wall of multiple stages are It is preferable to provide a watertight plate that abuts on the wall surface of the dam.

Further, the length of the flexible film forming the water blocking walls in the left and right direction is set so that both side edges of the flexible film bend along the dam wall surface on the dam lake side. A watertight presser plate for inserting both side edges of the flexible membrane is provided on the wall surface on the dam lake side to achieve watertightness between the flexible membrane on the impermeable wall at each stage and the dam wall surface on the dam lake side. You may do it.

As described above, since the flexible film forming the water shield walls in a plurality of steps is kept watertight with respect to the dam wall surface, when the water shield wall is moved up and down, the flexible film is formed. The contact surface with the wall surface of the dam is rubbed so that the flexible film is easily worn or broken.
For this reason, it is preferable that both side edge portions of the flexible film forming the water blocking walls in a plurality of steps are formed by separate replaceable parts.

Further, in order to prevent the lower edge of the flexible film forming the impermeable wall from being lifted and to improve the water tightness with the impermeable wall in the lower stage, the flexible film forming the impermeable wall is formed. A weight member such as a metal chain is preferably attached to the lower edge.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a dam selective water intake device according to the present invention will be described below. As shown in FIGS. 1 (a) to 1 (c), the selective water intake device for a dam according to the present invention is provided with a float 1 on the water surface of a dam lake A.
A plurality of stages (4 stages in this example) of vertically movable water-impervious walls 3a, 3b, 3 provided around the intake C along the dam wall B
This is a structure in which the water intake tower 2 composed of c and 3d is suspended and supported. Then, as shown in FIG. 1 (a), the height of the water intake tower 2 is lowered by lowering the plurality of steps of the impermeable walls 3 a to 3 d, and as shown in FIGS. 1 (b) and 1 (c). As described above, the height of the water intake tower 2 can be increased by sequentially raising the plurality of steps of the impermeable walls 3a to 3d, and the discharge from the water intake C to the downstream side can be performed at the height of the water intake tower 2. Accordingly, it is possible to take water at any height such as the upper layer, the middle layer or the lower layer of the dam lake A.

Float 1 is located on the water surface of Dam Lake A,
It is formed by combining steel plates and the like in a curved shape so as to surround the dam wall surface B of the intake wall projecting to the lake side, which has the intake C near the bottom of the lake. Both ends of the float 1 are attached to a pair of vertical guide rails 4a installed on the dam wall B,
It is supported so as to be movable up and down through a support fitting 5.

The float 1 is provided with three winding winches 7 for suspending and supporting the uppermost impermeable wall 3a of the water intake tower 2 at three positions near the ends and in the center.

On the outer surface of the float 1, driftwood and dust floating on the water surface are prevented from flowing into the water intake tower 2,
A skirt 8 formed of a rubber film or the like is installed.

The water intake tower 2 suspended and supported by the float 1 is composed of a plurality of stages of impermeable walls 3a to 3d which can be raised and lowered. The impermeable walls 3a to 3d are vertically movable along a pair of guide rails 4b provided on both sides of a dam wall surface B provided with an intake C projecting to the dam lake A side so as to be vertically movable. It is formed by a horizontally curved frame 10 supported via a flexible film 11 fixed to the frame 10 so as to hang down from the frame 10.

As the flexible film 11, a rubber cloth or the like can be used. The frame 10 is formed in a hollow structure made of stainless steel or steel. The buoyancy may be adjusted by filling the hollow frame 10 with air from an air tank through an air tube.

As shown in FIG. 8B or 8C, the length of the flexible film 11 in the vertical direction is as shown in FIG. 8B or 8C.
Even if the flexible film 11 is bent inward and lifted by water pressure from the outside while the space is widened and the flexible film 11 is stretched, as shown in FIG. The length of the lower edge overlaps the outer lower side of the lower frame 10. Thereby, even if the flexible film 11 is bent inward by water pressure and the lower edge of the flexible film 11 is lifted upward, the lower edge of the flexible film 11 contacts the outer side of the lower frame 11,
A water leakage space is not formed between the lower end of the upper impermeable wall 3 and the upper end of the lower impermeable wall 3.

The frame 11 of the upper impermeable wall 3 and the frame 11 of the lower impermeable wall 3 are sequentially connected by a connecting chain 12. Therefore, when the wire 6 that suspends the frame 10 of the uppermost impermeable wall 3 is hoisted by the winch 7, the frame 10 of the lower impermeable wall 3 and the uppermost impermeable wall connected by the connecting chain 12 are connected. Three
8 (b) in a state in which the space between the frame 10 and the frame 10 is gradually widened and the frame 10 of the uppermost impermeable wall 3 is pulled up most.
Alternatively, as shown in (c), the flexible membranes 11 of the impermeable walls 3 in a plurality of stages are stretched, and the height of the water intake tower 2 is increased.

On the other hand, as shown in FIG. 4, when the wire 6 is extended and the frame 10 of the uppermost impermeable wall 3 is lowered, the flexible film 11 of the upper impermeable wall 3 is changed to the one shown in FIG. As shown in a), while overlapping the flexible membrane 11 of the lower water-blocking wall 3, the interval between the frames 10 in each step becomes narrower, so that the height of the water intake tower 2 becomes higher than the height of the water intake C. Go down to a lower position.

At the lower edge of the flexible film 11 forming the water shield wall 3, a metal is formed on the lower edge of the flexible film 11 in order to prevent the flexible film 11 from being lifted up and to improve the water tightness with the lower water shield wall 3. A weight member 13 such as a chain is attached.

Below the bottommost impermeable wall 3d, the multi-tiered impermeable walls 3a to 3d stacked near the lake bottom D are pulled up by the hoisting winch 7 when the multi-tiered impermeable walls 3a are pulled up. In order to prevent the entire ~ 3d from being pulled upward while overlapping, the two bottom frames 14, 15 having the same shape as the frame 10 of the impermeable walls 3a to 3d have the same shape as the impermeable walls 3a to 3d. They are connected by a connecting chain 12, and the lower bottom frame 15 is fixed to the dam wall surface B by a fixing wire rope 16.

Further, on the dam wall surface B below the intake C,
In order to prevent water near the lake bottom D from being caught in the water intake tower 2 formed by the water impermeable walls 3a to 3d, the bottom water impermeable wall 17 that closes the lower surface of the water intake tower 2 has the fixing wire rope 18 Is fixed by. This bottom impermeable wall 17
Is the upper and lower frames 17 as shown in FIG. 8 and FIG.
It is composed of a and 17b, a top plate 17c and a side plate 17d.

As shown in FIG. 7, the bottom water-impervious wall 17 is formed in such a size as to fit snugly inside the frame 10 and the bottom frame 14 of the water-impervious walls 3a to 3d, and the impermeable walls 3c to 3d.
The inner periphery of the frame 10 and the bottom frame 14 is a packing 1 that keeps watertightness by closely adhering to the side plate 17d of the bottom impermeable wall 17.
9 is attached.

Flexible membrane 1 of the above-mentioned water-impervious walls 3a to 3d at each stage.
In order to achieve the water tightness between 1 and the dam wall surface B, as shown in FIG. It is preferably provided in the vertical direction.

Further, as shown in FIG. 12, the impermeable wall 3
The lateral length of the flexible film 11 forming a to 3d is
Both sides of the flexible membrane 11 are formed to have a length that bends along the dam wall B, and the dam wall B is provided with a watertight presser plate 21 into which both edges of the flexible membrane 11 are inserted. Water wall 3a ~
The water tightness between the 3d flexible film 11 and the dam wall surface B may be improved.

Since the flexible film 11 forming the water shield walls 3a to 3d is kept watertight with respect to the dam wall surface B, when the water shield walls 3a to 3d are moved up and down, the flexible film 11 is moved. 11 and the dam wall surface B are rubbed with each other, and the flexible film 11 is easily worn or broken. Therefore, as shown in FIG. 13, both side edge portions of the flexible film 11 are formed as separate parts 11a, and the bolts 22
It is convenient and the cost can be reduced if it can be replaced.

[0035]

As described above, in the selective water intake device according to the present invention, the intake tower whose water intake height can be changed is formed by the plurality of steps of the impermeable walls including the frame and the flexible membrane. Since it can be made much lighter than steel, it can be installed with a float on the surface of the dam lake, the elevating device can be downsized, the operating cost is low, the construction period for installation work is short, and the construction cost is low. Can also be cheaper.

[Brief description of drawings]

FIG. 1 is a schematic view showing an installation situation of a selective water intake device according to the present invention, in which (a) shows a state in which the height of the water intake tower is lowered to the lowest position, and (b) shows the height of the water intake tower in an intermediate position. (C) shows a state in which the height of the water intake tower is raised to the highest level.

FIG. 2 is a front view of the selective water intake device according to the present invention showing a state in which the height of the water intake tower is raised to the highest level.

FIG. 3 is a side view of FIG.

FIG. 4 is a side view of the selective water intake device according to the present invention showing a state in which the height of the water intake tower is lowered to the lowest position.

FIG. 5 is a plan view of a float portion.

FIG. 6 is a plan view of an upper surface portion of a water blocking wall.

FIG. 7 is a plan view of a bottom impermeable wall portion.

FIG. 8 is a partial cross-sectional view showing the relationship between the flexible membrane of the impermeable wall, the frame and the bottom impermeable wall, (a) showing a state where the height of the water intake tower is lowered to the lowest position, (b). Shows a state in which the height of the water intake tower is raised to an intermediate position, and (c) shows a state in which the height of the water intake tower is raised to the highest level.

FIG. 9 is a partial cross-sectional view showing the relationship between the lower edge of the upper flexible film and the lower frame.

FIG. 10 is a partial cross-sectional view of a bottom impermeable wall.

FIG. 11 is a partial cross-sectional view showing an example of a watertight structure at a side edge portion of a flexible film.

FIG. 12 is a partial cross-sectional view showing another example of the watertight structure at the side edge of the flexible film.

FIG. 13 is a partial cross-sectional view showing an example in which the side edge portion of the flexible film is formed as a separate part.

[Explanation of symbols]

A dam lake B dam wall C water intake D Lake bottom 1 float 2 water intake tower 3a-3d impermeable wall 4a, 4b Guide rail 5 Support bracket 6 wires 7 hoisting winch 8 skirt 9 Guide roller 10 frames 11 flexible membrane 11a Separate parts 12 chains 13 Weight member 14, 15 bottom frame 16 Wire rope for fixing 17 Bottom impermeable wall 17a, 17b frame 17c Top plate 17d Side plate 18 Wire rope for fixing 19 packing 20 watertight board 21 Watertight pressure plate 22 volts

Claims (12)

[Claims] 1. An intake tower that surrounds the intake along the dam wall on the dam lake side is formed by a plurality of stages of impermeable walls that can be raised and lowered, and by raising and lowering the impermeable wall, the intake height of the intake tower is increased. In the selective water intake device of the dam that can be changed from the lower layer to the upper layer of the dam lake, each step of the above-mentioned impermeable walls is provided with a pair of guide rails provided in the vertical direction along the dam wall surface on the dam lake side, A selective water intake device for a dam, comprising a horizontally curved frame whose both ends are supported so as to be vertically movable, and a flexible membrane supported by the frame so as to hang down from the frame. 2. The flexible membrane supported by the upper-stage frame has a length in the up-down direction in which the frame spacing of the impermeable walls of each stage is widened, and the flexible membrane is provided with an inner side by water pressure from the outside. The selective water intake device for a dam according to claim 1, wherein a lower edge of the upper flexible film has a length overlapping with an outer lower side of the lower frame even when the upper flexible membrane is bent. 3. The selective water intake device for a dam according to claim 1, wherein a bottom impermeable wall is provided on the bottom surface of the water intake tower composed of the plurality of stages of impermeable walls. 4. A float is provided on the surface of the dam lake, and the uppermost impermeable wall of the intake tower is hung from the float by a wire, and a winder winch for the wire is installed on the float to shield each stage. 4. The water wall frames are sequentially connected by a connecting chain.
The selective water intake device for the dam described in any of 1. 5. The watertight plate with which both side edges of a flexible film forming a plurality of steps of a water blocking wall abut against the wall surface of the dam on the lake side are provided with a watertight plate. Dam selective water intake device. 6. The length in the left-right direction of the flexible membrane forming the water-impervious walls in a plurality of stages is such that both side edges of the flexible membrane bend and abut along the dam wall surface on the dam lake side. The selective water intake device for a dam according to any one of claims 1 to 4, further comprising a retaining watertight plate formed on the dam wall surface on the dam lake side to insert both side edges of the flexible membrane. 7. The dam according to claim 1, wherein both side edge portions of the flexible film forming the plurality of steps of the water blocking wall are formed by separate replaceable parts. Selective water intake device. 8. The selective water intake device for a dam according to claim 1, wherein a weight member is attached to a lower edge of the flexible film forming the plurality of steps of the water blocking walls. 9. The selective water intake device for a dam according to claim 1, wherein the weight member is made of a metal chain. 10. The selective water intake device for a dam according to claim 1, wherein the flexible film is formed of a rubberized cloth. 11. The selective water intake device for a dam according to claim 1, wherein the frame forming the plurality of steps of the impermeable walls has a hollow structure. 12. The selective water intake device for a dam according to claim 11, wherein the buoyancy is adjusted by filling air from an air tank into the hollow frame.