JP6138029B2 - Sediment discharge facility for dam reservoir - Google Patents

Description

  The present invention relates to a facility for discharging sediment from a dam reservoir downstream from a bank body, that is, a sediment discharging facility for a dam reservoir.

  Generally, dams are designed on the assumption that sedimentation flows from the upstream side into the dam reservoir. However, if more sediment than is planned flows into the dam reservoir, it may adversely affect the work of the dam, so it is necessary to remove the sediment from the dam reservoir by dredgers. As what does not require such a dredger, what provided the sediment discharge apparatus in the dam itself is proposed (for example, refer patent document 1). The device described in Patent Document 1 is configured to discharge sediment using a siphon principle by piping from the dam reservoir to the downstream side of the dam body.

JP 2008-106497 A

  However, the apparatus described in Patent Document 1 discharges the sediment and water in the dam reservoir together. For this reason, a large pipe (for example, a siphon device) and a pump for carrying both sediment and water are required, and a special valve that can block the flow of sediment and water is necessary for this large pipe. As a result, the apparatus becomes complicated. In addition, since the apparatus described in Patent Document 1 discharges sediment and water (that is, turbid water) downstream, that is, wastefully discharges water that does not need to be discharged, such as a flood season or a flood season. It can only be operated when the dam reservoir has abundant water. Thus, in the said apparatus, since the period which can operate | move is limited, it is necessary to discharge | emit a lot of sediment during that period. For this reason, the said apparatus becomes large inevitably, and cost becomes high.

  Therefore, an object of the present invention is to provide a sediment discharge facility in which the facility itself is simplified and does not waste water in a dam reservoir.

In order to solve the above-mentioned problem, the sediment discharge facility for a dam reservoir according to claim 1 of the present invention is a dam reservoir compost provided with a sediment transport means for moving the sediment of the dam reservoir to the downstream side of the dam body. Sand discharge equipment,
A siphon-type water conduit having a water intake port disposed in the water area of the dam reservoir, over the dam body, and a drain port disposed on the downstream side of the dam body;
A negative pressure pump that applies the principle of siphon to the siphon-type water conduit,
A hydraulic engine driven by water from the siphon-type conduit,
Power transmission means for driving the sediment transporting means by transmitting the power generated by driving the hydraulic engine to the sediment transporting means is provided.

Moreover, in the sediment discharge facility of the dam reservoir of the present invention according to claim 2, the sediment transport means according to claim 1 has a screw conveyor,
The said screw conveyor is a structure which can discharge | emit water from a to-be-conveyed object, and can return it to a dam reservoir.

Furthermore, in the sediment discharge facility for the dam reservoir of the present invention according to claim 3, the screw conveyor according to claim 2 is arranged so as to be submerged in the dam reservoir, and sucks the sediment and water. It is connected to the downstream side of this suction screw conveyor and has an ascending screw conveyor that conveys the sedimentation upward,
A universal joint connecting the suction screw conveyor and the ascending screw conveyor;
A rotating support for supporting the ascending screw conveyor rotatably in the axial direction;
Floating in the dam reservoir and moored and movable,
The upstream portion of the suction screw conveyor is moored to the floating body and is movable.

Further, the sediment discharge facility for the dam reservoir according to claim 4 of the present invention is the sediment discharge facility for the dam reservoir according to claim 3, wherein a propeller that is interlocked with the screw of the suction screw conveyor is provided,
The propeller agitates the sediment in the dam reservoir by the fluid force generated by the rotation, thereby expanding the suction range of the sediment by the suction screw conveyor.
Moreover, the sediment discharge facility of the dam reservoir of the present invention according to claim 5 is the sediment discharge facility of the dam reservoir according to any one of claims 1 to 3, wherein the hydraulic engine is a siphon type conduit. Water is alternately supplied to the head side or the cap side, and a double-acting hydraulic cylinder that moves the piston back and forth, and an output shaft that is driven by the piston moving back and forth.

  According to the sediment discharge facility of the dam reservoir, the facility can be simplified and waste of water in the dam reservoir can be prevented.

It is a schematic perspective view which shows the sediment discharge facility of the dam reservoir which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the sediment discharge facility of the dam reservoir. It is a longitudinal cross-sectional view which shows the screw conveyor in the sediment discharge facility of the dam reservoir. 3 is an enlarged view of FIG. 3, (a) is an enlarged view of a in FIG. 3, (b) is an enlarged view of b of FIG. 3, and (c) is an enlarged view of c of FIG. 3. It is a figure which shows the cross-sectional view of the mouth part in the screw conveyor, (a) is AA sectional drawing of FIG.4 (c), (b) is BB sectional drawing of FIG.4 (c), (c ) Is a cross-sectional view taken along the line CC of FIG. It is a figure which shows the hydraulic engine in the sediment depositing equipment, (a) is side surface sectional drawing, (b) is a perspective view. It is a hydraulic-pressure circuit diagram which shows the hydraulic cylinder and hydraulic equipment in the hydraulic engine.

Hereinafter, a sediment discharge facility for a dam reservoir according to an embodiment of the present invention will be described with reference to the drawings.
First, the schematic structure of the sediment discharge facility of the dam reservoir will be described.

  As shown in FIGS. 1 and 2, the sediment discharge facility moves the sediment A accumulated at the bottom of the dam reservoir P to the downstream D of the dam body B and discharges it. That is, the sediment discharge facility 100 is roughly divided into the sediment transport means 1 to 4 for moving the sediment A of the dam reservoir P to the downstream side D of the dam body B, and the sediment transport means 1 to 4. It comprises power generation means 5-7 for generating necessary power and power transmission means 8-10 for transmitting the power generated by the power generation means 5-7 to the sediment transport means 1-4.

"Sediment transport means 1-4"
As shown in FIGS. 1 and 3, the sediment transporting means 1 to 4 include a suction screw conveyor 1 disposed in the dam reservoir P from the upstream side of the sediment A, and the suction screw conveyor 1. The ascending screw conveyor 2 connected to the downstream end, and the belt conveyor 3 that conveys the object to be transported from the ascending screw conveyor 2 (sediment A, which will be described in detail below) to the bank top Bt substantially horizontally. Is done. Further, as shown in FIGS. 1 and 2, the sediment transporting means 1 to 4 slide the sediment A, which is a material to be transported from the belt conveyor 3, down to the downstream side D of the dam body B. A tube 4 (eg bellows hose) is also provided.

  The suction screw conveyor 1 and the ascending screw conveyor 2 (hereinafter simply referred to as the screw conveyors 1 and 2) are all transported while draining the object to be transported from the upstream side to the downstream side. That is, the screw conveyors 1, 2 are enlarged views of a and b in FIG. 3, that is, as shown in FIGS. 4 (a) and 4 (b), outer shell guide tubes 1o and 2o and inner shell guide tubes 1i and 2i. And screws 1 s and 2 s that rotate inside the inner shell guide tubes 1 i and 2 i to convey the object to be conveyed. The inner shell guide pipes 1i and 2i have a structure (porous double pipe) in which a hole is formed and water is discharged from the transported object, that is, a drainage structure. For this reason, in the transported object, water is discharged at the stage of rising from the water surface of the dam reservoir P, and only the sediment A is obtained.

  As shown in FIGS. 1 and 3, the suction screw conveyor 1 has an upstream end (hereinafter referred to as a “mouth portion 1 m”) at a central position (a position where a large amount of sediment A is accumulated) in plan view. And the downstream end is arranged near the slope T. That is, the suction screw conveyor 1 sucks the sediment A and water at the mouth portion 1m and conveys it to the downstream end (upward screw conveyor 2 side). Here, the shed 1m has a structure that can suck the sediment A efficiently. That is, as shown in FIG. 4 (c), the mouth portion 1m is formed so that the screw shaft 1a and the upper part of the outer shell guide tube 1o are extended to the upstream side of the suction, and upstream of the extended screw shaft 1a. A propeller 11 provided at the end [see also FIG. 5A] and an open disk 12 that sucks the sediment A and water agitated and transferred by the fluid force generated by the rotation of the propeller 11 by the nozzle effect [FIG. see also c)]. Further, as shown in FIG. 4 (c), the shed portion 1m is provided with two support portions 13 and 14 for supporting the extended screw shaft 1a. One of these two support portions 13 and 14 is a three-way support portion 13 [see also FIG. 5 (b)] arranged on the downstream side of the propeller 11, and the other is arranged on the downstream side of the opening disk 12. It is the four-way bearing part 14 [refer also FIG.5 (c)]. As shown in FIGS. 1 and 3, the shed 1m is moored to the floating body F floated on the dam reservoir P (the floating body F itself is also moored to the slope T). Is movable in the upstream and downstream directions and in the vertical direction.

  As shown in FIG. 3, the ascending screw conveyor 2 is arranged along the tilting T so as to be rotatable with respect to the axial direction of the guide tubes 1 o and 1 i by a plurality of rotating supports S. The rising screw conveyor 2 is connected at its upstream end to the downstream end of the suction screw conveyor 1 via a universal joint (details will be described later as a second universal joint 10). For this reason, the suction screw conveyor 1 and the ascending screw conveyor 2 are configured so that the second universal joint 10 and the rotation support body are provided even if the mouth portion 1m of the suction screw conveyor 1 moves to some extent in the upstream and downstream directions and the vertical direction. S is a configuration that can be flexibly handled. Furthermore, as shown in FIG. 1, the ascending screw conveyor 2 is disposed such that the downstream end is positioned higher than the bank top Bt.

  The belt conveyor 3 is a publicly-known well-known earth-and-sand conveyor belt conveyor, and as shown in FIG. 1, an endless belt 3b that transports the sediment A, and a drive unit 3r that circulates the endless belt 3b. Have The belt conveyor 3 has an upstream end disposed below the downstream end of the ascending screw conveyor 2 and a downstream end disposed on the bank top Bt. In addition, although the one belt conveyor 3 was shown in FIG. 1, depending on the distance which conveys the sediment A, several belt conveyors 3 may be connected in series.

  As shown in FIG. 1, the sand discharge pipe 4 has an upstream end disposed below the downstream end of the belt conveyor 3 and a downstream end disposed on the downstream side D of the dam body B. As shown in FIG. 1 and FIG. 2, a location suitable for temporarily placing the sediment A (for example, a river bank) (hereinafter referred to as a sediment sedimentation place Dp) is selected as the downstream end position of the sand discharge pipe 4. The

"Power generation means 5-7"
As shown in FIGS. 1 and 2, the power generation means 5 to 7 include a siphon-type water conduit 5 disposed so as to straddle the dam body P from the dam reservoir P, and a siphon principle in the siphon-type water conduit 5. And a hydraulic engine 7 driven by water from the siphon water conduit 5 is provided.

  As shown in FIG. 1, the siphon type conduit pipe 5 has an upstream end (water intake) disposed in the dam reservoir P along the bank B and a downstream end (drain) downstream of the bank B. D is connected to the hydraulic engine 7. The siphon-type conduit 5 is not shown in the figure, but the upstream end (water inlet) is located in the water area of the dam reservoir P, and a filter is provided inside, so that only water is sent to the hydraulic engine 7. It is.

  As shown in FIG. 1, the negative pressure pump 6 is disposed at the highest position of the siphon-type water conduit 5, that is, at the bank top Bt. For this reason, the negative pressure pump 6 applies the siphon principle to the siphon water conduit 5 by filling the siphon water conduit 5 with water up to the position.

  As shown in FIG. 6 (a), the hydraulic engine 7 includes a piston rod 78 of a double-acting hydraulic cylinder 70 using water from the siphon-type water conduit 5 (hereinafter referred to as pressure water as shown in FIG. 2). The output sprocket 80 (see FIG. 6B) is rotated together with the drive shaft 69 by the withdrawal and withdrawal of the piston rod 78. In the following, the head side of the hydraulic cylinder 70 will be described as the front side, and the cap side will be described as the rear side. The hydraulic engine 7 includes a pedestal 61h on which at least five (first to fifth) members 61v are erected and fixed, and devices 62 to 70 installed on the pedestal 61h. And a box body 60 for housing the frame 61h and the devices 62 to 70. The devices 62 to 70 are the above-described double-acting hydraulic cylinder 70 supported by the fourth and fifth support members 61v and capable of moving the piston rod 78 out of and with the pressure water, and the piston rod of the hydraulic cylinder 70. A connecting rod 62 whose rear end is connected to the front end (front end) of 78, a connecting rod guide 63 that supports the connecting rod 62 so as to be movable in the front-rear direction, and is supported by a third support member 61v, and a front end of the connecting rod 62; And a rotary disc 65 that is rotatably supported via a crankshaft 64 of the second support member 61v, and a drive sprocket 66 that synchronizes with the rotation of the rotary disc 65. In other words, the rotating disk 65 can rotate around the crankshaft 64 by rotating the piston rod 78 of the hydraulic cylinder 70 to rotate the drive sprocket 66. The rotation of the drive sprocket 66 is assisted by a flywheel (not shown) and the torque becomes constant. The devices 62 to 70 connect a drive shaft 69 provided on the first support member 61v, a passive sprocket 68 whose center is fixed to the drive shaft 69, and the drive sprocket 66 and the passive sprocket 68. And a chain 67 to be interlocked. That is, the drive shaft 69 is rotationally driven by the rotation of the drive sprocket 66. Further, the drive shaft 69 extends to the left side (front side in FIG. 6A) and penetrates the box body 60, and as shown in FIG. The output sprocket 80 described above is attached. As described above, the hydraulic engine 7 can rotate the output sprocket 80 with water (pressure water) from the siphon-type water conduit 5. Further, the hydraulic engine 7 is sufficiently driven with a small amount of water because the amount of pressure water required for driving is only the volume of the piston 76 moved. Furthermore, the rotational speed of the output sprocket 80 in the hydraulic engine 7 is lower than that of other hydraulic engines such as a hydro turbine, and there is no significant difference from the rotational speed required for the sediment transporting means 1 to 4.

Next, the hydraulic cylinder 70 which is a main part of the hydraulic engine 7 and the hydraulic equipment connected to the hydraulic cylinder 70 by a hydraulic circuit will be described with reference to FIG.
"Hydraulic cylinder 70"
The hydraulic cylinder 70 includes a cylinder body 71 having a long cylindrical cylinder tube 72 and a piston portion 75 that is movable in the longitudinal direction inside the cylinder tube 72.

  The cylinder main body 71 includes a front cover 73F that covers the opening at the front end of the cylinder tube 72, a rear cover 73R that covers the opening at the rear end of the cylinder tube 72, and an outer peripheral surface of the cylinder tube 72. The front and rear ports 74F and 74R for supplying and discharging the pressure water are provided. Among these, the front port 74F is attached toward the rear surface of the front cover 73F, and the rear port 74R is attached toward the front surface of the rear cover 73R. These front and rear ports 74F and 74R are for draining at the other / one port (74R / 74F) while supplying water at one / the other port (74F / 74R).

  The piston portion 75 includes a piston 76 that can move back and forth inside the cylinder tube 72 while sliding on the inner peripheral surface of the cylinder tube 72, and front and rear cushion plungers that project from the front and rear surfaces of the piston 76. 77 and the piston rod 78 attached to the front cushion plunger 77 and extending forward through the front cover 73F.

  Front and rear fitting recesses 73i that are substantially the same shape as the front and rear cushion plungers 77 are formed on the rear surface side of the front cover 73F and the front surface side of the rear cover 73R. The front cover 73F and the rear cover 73R are formed with front and rear communication grooves 73c that connect the front and rear fitting recesses 73i and the front and rear ports 74F and 74R, respectively. Further, the front cover 73F is formed with a rod hole 73l through which the piston rod 78 passes.

"Hydraulic equipment"
Examples of the water pressure device include the leading end detector 52 and the trailing end detector 53 that detect the movement limit of the piston 76 in the front-rear direction, and supply of pressure water / The direction switching valve 54 for automatically switching the discharge ports 74F and 74R, the inflow control valve 55 for controlling the inflow amount of the pressure water to the direction switching valve 54, and the outflow amount of the pressure water from the direction switching valve 54 are controlled. An outflow control valve 56 is provided.

  As an example other than the configuration described above, although not shown, a cam mechanism directly connected to the crankshaft 64 is provided instead of the extended end detector 52 and the retracted end detector 53. The cam mechanism mechanically detects the movement limit of the piston 76 in the front-rear direction, and transmits a signal about the detection to the direction switching valve 54, so that the extension end detector 52 and the retraction end detector 53 are provided. The same control as that to be realized is realized.

"Power transmission means 8-10"
As shown in FIG. 1, the power transmission means 8 to 10 include a rotary shaft 8 that transmits the rotational force (power) of the output sprocket 80 in the hydraulic engine 7 to the drive unit 3 r in the belt conveyor 3, and In addition, the first universal joint 9 that transmits the rotational force (power) of the drive unit 3r to the screw 2s in the ascending screw conveyor 2 and the rotational force (power) of the screw 2s in the ascending screw conveyor 2 are screwed in the suction screw conveyor 1. The second universal joint 10 that transmits to 1s is provided. Since there is no significant difference between the rotational speed of the output sprocket 80 and the rotational speed required for the drive unit 3r and the screws 1s and 2s, the power transmission means 8 to 10 do not require equipment such as a speed reducer. .

Hereinafter, the operation of the sediment discharge facility 100 of the dam reservoir P will be described.
First, the negative pressure pump 6 is filled with water from the water inlet to the highest position of the siphon-type water conduit 5. Then, the siphon principle works on the siphon-type water conduit 5, and then the water of the dam reservoir P is automatically sent from the water inlet of the siphon-type water conduit 5 to the drain even if the negative pressure pump 6 is stopped.

  When the sediment A accumulated at the bottom of the dam reservoir P needs to be discharged to the downstream side D of the dam body B, the inflow control valve 55 and the outflow control valve 56 are opened. Then, the pressure water is supplied to the hydraulic cylinder 70, the piston rod 78 is withdrawn and retracted, and the output sprocket 80 is rotationally driven.

  When the output sprocket 80 rotates, this rotational force (power) is transmitted to the drive unit 3r by the rotating shaft 8, and the endless belt 3b circulates. Further, the rotational force (power) of the drive unit 3r is transmitted to the screw 2s in the ascending screw conveyor 2 by the first universal joint 9, and the screw 2s rotates. Further, the rotational force (power) of the screw 2s is transmitted to the screw 1s in the suction screw conveyor 1 by the second universal joint 10, and the screw 1s rotates. For this reason, the sediment A and water are sucked by the suction screw conveyor 1 from the mouth portion 1 m and conveyed to the ascending screw conveyor 2. In addition, in the shed 1m, when the sediment A is agitated by the fluid force generated by the rotation of the propeller 11, the suction range of the sediment A is expanded. Further, the ascending screw conveyor 2 discharges water from the objects to be transported (the sediment A and water), and the sediment A is transported to the belt conveyor 3. Further, the sediment A is transported to the sand removal pipe 4 by the belt conveyor 3, and the sediment A slides down to the temporary sediment storage place Dp by the sand removal pipe 4.

  Thus, according to the sediment discharge facility 100 of the dam reservoir P, by using the hydraulic engine 7, the sediment transport means 1 to 4 are sufficiently driven even with a small amount of water in the dam reservoir P. Therefore, the dam reservoir P It is possible to prevent waste of water.

  Further, by using the hydraulic engine 7, there is no significant difference between the rotational speed of the output sprocket 80 and the rotational speed required for the drive unit 3r and the screws 1s and 2s, and a large speed reduction device such as a speed reducer is required. The equipment can be simplified because it does not.

  Furthermore, since the ascending screw conveyor 2 discharges water from the transported object and returns it to the dam reservoir P, it is possible to further prevent waste of the dam reservoir P without transporting the dam reservoir P water wastefully. it can.

In addition, since the water of the dam reservoir P is not transported unnecessarily by the ascending screw conveyor 2, the power required for transport can be reduced and the equipment can be further simplified.
In addition, the mouth portion 1m is moored to the floating body F, and is movable to some extent in the upstream and downstream directions and the vertical direction, and has a structure that can efficiently suck the sediment A, so by suppressing the suction of water, The facility can be further simplified.

By the way, in the said embodiment, although the number of the hydraulic cylinders 70 in the hydraulic engine 7 was not demonstrated, it designs suitably according to the motive power required for the sediment transport means 1-4.
In the above embodiment, the connecting structure between the output sprocket 80 and the rotating shaft 8 and the connecting structure between the rotating shaft 8 and the drive unit 3r, which are the power transmission means 8 to 10, have not been described in detail. For these connection structures, known ones such as gears are appropriately used.

  Furthermore, you may make it the structure which can attract the sediment A more efficiently by generating the accompanying flow in the vicinity of the shed 1m. Specifically, although not shown in the drawing, a plurality of suction ports for sucking sediment A are formed in the opening disc 12, and a separate thin tube (hereinafter referred to as the downstream side of the opening disc 12 and the four-way support portion 14 in the outer shell guide tube 1o). Connect the upstream end of the suction tube. On the other hand, a part on the downstream side of the siphon-type water conduit 5 is used as a branch part, and a venturi pipe is connected to this branch part. Further, the downstream end of the suction pipe is connected to the venturi pipe. In addition, in order to control the flow of the pressure water from the branch part of the siphon type water guide pipe 5 to the venturi pipe, a gate valve is provided on the upstream side of the venturi pipe. With this structure, the venturi principle is applied to the venturi pipe by opening the gate valve, and an accompanying flow is generated in the throat portion 1m via the suction pipe and the suction port. Therefore, since the sediment A is efficiently sucked, waste of water in the dam reservoir P can be further prevented.

DESCRIPTION OF SYMBOLS 1 Suction screw conveyer 2 Ascending screw conveyer 3 Belt conveyer 4 Sand discharge pipe 1-4 Sediment conveyance means 5 Siphon type water guide pipe 6 Negative pressure pump 7 Hydraulic engine 5-7 Power generation means 8 Rotating shaft 9 First universal joint 10 First 2 Universal joints 8 to 10 Power transmission means 70 Hydraulic cylinder

Claims (5)

A sediment discharge facility for a dam reservoir equipped with a sediment transport means for moving the sediment of the dam reservoir to the downstream side of the dam body,
A siphon-type water conduit having a water intake port disposed in the water area of the dam reservoir, over the dam body, and a drain port disposed on the downstream side of the dam body;
A negative pressure pump that applies the principle of siphon to the siphon-type water conduit,
A hydraulic engine driven by water from the siphon-type conduit,
A dam reservoir sediment discharging facility, comprising: a power transmission means for driving the sediment transporting means by transmitting power generated by driving the hydraulic engine to the sediment transporting means. The sediment transport means has a screw conveyor,
2. The sediment discharge facility for a dam reservoir according to claim 1, wherein the screw conveyor has a structure capable of discharging water from a transported object and returning it to the dam reservoir. A screw conveyor is submerged in the dam reservoir and has a suction screw conveyor that sucks sediment and water, and a lift screw conveyor that is connected to the downstream side of the suction screw conveyor and transports the sediment. And
A universal joint connecting the suction screw conveyor and the ascending screw conveyor;
A rotating support for supporting the ascending screw conveyor rotatably in the axial direction;
Floating in the dam reservoir and moored and movable,
The sediment discharging facility for a dam reservoir according to claim 2, wherein an upstream portion of the suction screw conveyor is moored to the floating body to be movable. Propeller that works with the screw of the suction screw conveyor is provided,
The dam according to claim 3, wherein the propeller agitates the sediment in the dam reservoir by a fluid force generated by the rotation thereof, thereby expanding the suction range of the sediment by the suction screw conveyor. Reservoir sedimentation facility.   A hydraulic engine has a double-acting hydraulic cylinder in which water from a siphon-type water conduit is alternately supplied to a head side or a cap side to cause a piston to move in and out, and an output shaft that is driven by the piston moving in and out. The sediment discharge facility for a dam reservoir according to any one of claims 1 to 4.

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