JP4507605B2 - Dust remover for irrigation canals - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dust removal device for a water channel that is used to separate dust flowing in along with the flowing water from the flowing water and discharge it outside the water channel in a water channel installed for agricultural water, hydroelectric power plant water, and the like. is there.

The dust that flows into the irrigation channel along with the running water when taking the irrigation water from the river has become an obstacle to the use of the water, and has been eliminated by various devices and efforts.
The most basic of the method was to catch the dust flowing down with a screen in which steel bars were diagonally arranged in the canal and picked up with a rake by human power.
However, the demand for mechanization of dust removal work has become stronger due to the upsizing of facilities, and various dust removal devices have been devised, developed and used.
Nothing in particular

By the way, mechanical equipment that captures dust separated in running water and separates it from water operates in water corresponding to dust of various sizes, shapes, and materials, and thus becomes large and expensive.
In addition, water flows into the irrigation channel without taking a break, and the dust also flows along with it, so the dust removal device is frequently operated and worn out, so that a large expense is required for maintenance and repair.

In addition, disposal of the garbage raised from the irrigation canal requires a lot of labor and cost. In recent years, since the amount of dust mixed in running water has been increasing, one of the important matters for the manager of the irrigation channel that needs to be solved is the disposal of this dust.

Therefore, in recent years, when water is taken from the river, garbage is separated and returned to the river without entering the irrigation channel, and a horizontal horizontal screen is attached to the front of the water intake so that it flows down naturally. Various ideas have been made, such as the development of water intake equipment that draws dust from the thing and the discharge gate, but the effect is insufficient and improvement is required.

Therefore, in the dust removal apparatus for the irrigation channel of the present invention, the screen and gate facility provided in the middle of the irrigation channel are effectively arranged, and the dust is returned to the river using a small amount of water.

In other words, in the middle of the irrigation channel, a deep part with a lower water channel bottom is created, and a descending wall is installed in the middle, and the water flow descending from the top to the bottom of the descending wall rises again downstream of the descending wall. A horizontal screen is installed at a position to return to the normal flow to catch the dust mixed in the running water.
When the drainage gate provided below the horizontal screen is opened, the water inside the irrigation channel flows out of the drainage gate, so that the dust trapped on the lower side of the horizontal screen goes out of the irrigation channel together with the water. It is discharged.
At this time, in order to allow the dust trapped below the horizontal screen to flow, if the water downstream from the horizontal screen flows backward, the horizontal screen is washed from the top and the dust removal effect is good.

In addition, in order to flow the dust that has floated on the water surface and stays on the upstream side of the descending wall, the dust removal effect is good if the water on the upstream side of the descending wall flows down vigorously.
Furthermore, it is necessary that the drain outlet is appropriately large according to the size of the dust. It is also known from experience that dust removal can be carried out efficiently in a short time when the amount of water flowing out when the drain gate is opened is moderate.
Therefore, the water control gates are installed by selecting the positions of the normal cross sections on the upstream and downstream sides of the irrigation channel adjacent to the section where the bottom of the irrigation channel is lowered and the water depth is deepened. If the upstream and downstream water control gates are closed, the time required for discharging the dust is shortened, and the amount of water loss is small, and dust removal can be performed efficiently.
And the dust discharged with the water from the drain gate returns to the river as it is, so the manager of the irrigation channel is freed from the task of disposing of the dust captured and lifted from the flowing water.

In this way, the dust removal device of the irrigation channel composed of the descending wall, the horizontal screen, the drainage gate, and the water control gates installed upstream and downstream in the place where the water depth in the middle of the irrigation channel is deepened is like a conventional dust removal device. It is not composed of a large number of precision mechanical parts, and the water control gate and drainage gate are commonly used gate facilities, so they are inexpensive and have excellent durability. In addition, the drainage gate can also be used as a drainage gate installed in places in the irrigation canal, and the water control gate can also be used as a water control gate installed in places in the irrigation canal. In addition, it is a facility with a low construction cost burden and has little wear and tear due to operation.

As described above, the irrigation dust removing apparatus of the present invention has excellent characteristics, but has a fundamental problem. That is, the water level of the upstream and downstream irrigation channels fluctuates significantly each time the dust removal operation is performed.
In other words, in order to remove dust, the water control gate is closed, the irrigation channel is closed, the drainage gate is opened, and the water in the irrigation channel is released even though it is partly. As the water level rises, an overflow weir for spillover may be required for safety.
Therefore, there is a problem that the power generation output of the hydropower plant can be reduced and fluctuated, and there is a concern that in the agricultural channel, the water level of the downstream reservoir will be lowered and air may be mixed into the pipeline. .

Therefore, in the dust removal device for the irrigation channel according to the present invention, at the position where the dust removal device is provided, a flow guide wall that equally divides the width of the irrigation channel into 2 or n is provided, and the dust removal operation is performed at the irrigation channel width of 1/2 or 1 / n. The remaining ½ or (n−1) / n irrigation canals continued to run as usual.

In this way, it is possible to avoid a significant fluctuation in the upstream or downstream water level due to the dust removal operation.
Of course, it is possible to equally divide the width of the irrigation channel into 4 or 5, and if n is increased, the effect of calming the fluctuation of the water level will be improved accordingly, but the equipment cost will increase and the management will be complicated, It is not recommended to set n to 4 or more except in the case of a special large size.
Further, even when the width of the irrigation channel is equally divided into two, if the width of the irrigation channel can be expanded in the part of the dust removing device, the effect of calming the water level can be sufficiently obtained.
The dust removing apparatus of the type of claim 1 is capable of releasing water mixed with dust by installing drainage gates on the left and right side walls of the irrigation channel as in the case where the irrigation channel becomes a channel bridge and crosses the river. It is convenient to use it in some cases.
The dust removing apparatus of the second aspect can be used when it is preferable to provide a drain gate on the left or right side wall of the water channel.
The dust removing device of the type of claim 4 or claim 5 is a dust removing device in which the downstream water control gate is an economical type, and further pursuing economy.
The dust removing device of the type of claim 6 can be used when it is not allowed to discharge the garbage into the river.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a water channel dust removing device according to the present invention will be described in detail below with reference to the drawings.
FIG. 1 to FIG. 5 show one embodiment of a dust removal device for a water channel according to the present invention. FIG. 1 is a plan view of the dust removal device for a water channel according to this embodiment, and FIG. 3 shows a state where the upstream and downstream water control gates are closed and the dust removal operation is started in the cross-sectional view, and FIG. 4 further proceeds in the cross-sectional view to open the drain gate, and together with the water, FIG. 5 is a plan view showing a state in which the water channel divided on the right bank side is dedusted.

1, 2, 3, and 4, a portion 1 having an appropriate length in the middle of the irrigation channel is selected to lower the bottom of the channel, and a slightly longer channel having a channel bottom at a normal position upstream thereof. And a section of a slightly long portion 3 having a water channel bottom at a normal position downstream thereof, and a series of flow guide walls 4 for dividing the water channel width into two.
At the upstream end of the flow guide wall 4, a water control gate 5 for opening and closing the divided water channel on the right side of the flow guide wall 4 and a water control gate 6 for opening and closing the divided water channel on the left side of the flow guide wall 4 are installed. .
Also at the downstream end of the flow guide wall 4, a water control gate 7 that opens and closes the divided water channel on the right side of the flow guide wall 4 and a water control gate 8 that opens and closes the divided water channel on the left side of the flow guide wall 4. Is installed.
Further, in the middle of the length of the portion 1 where the bottom of the channel of the irrigation channel is lowered, the down wall 9 of the divided water channel on the right side of the flow guide wall 4 and the down wall 10 of the divided water channel on the left side of the flow channel 4. Are installed so that the water flow is obstructed in the portion from the side wall of the water channel and the top of the flow guide wall 4 to the height of the normal water channel bottom.
Further, horizontal screens 11 and 12 having a normal water channel bottom height are provided so as to cover the entire portion located downstream of the descending walls 9 and 10 of the portion 1 where the bottom of the water channel is lowered.

In addition, in the divided water channel on the right side of the flow guide wall 4, the upstream side of the down wall 9 or 10 of the portion 1 where the bottom of the water channel is lowered is selected and provided at the lower end of the right bank side wall of the water channel A drainage gate 13 for opening and closing the drainage port is provided, and in the divided water channel on the left side of the flow guide wall 4, a drainage gate 14 for opening and closing the drainage port provided at the lower end of the left bank of the irrigation channel is provided.
If the water control gates 5, 6, 7, 8 are fully opened, the drainage gates 13, 14 are fully closed and water is allowed to flow through the irrigation channel, the water flow is divided into the diversion channel width. 4 is divided into right and left and flows into the section of the dust removing device. Thereafter, the water passes through the water control gates 5 and 6 and then flows into the portion 1 where the bottom of the water channel is lowered, and is pushed downward by the descending walls 9 and 10 and goes under the descending walls 9 and 10.
Downstream of that, the lower part 1 of the water channel ends, so that the water flow is pushed upward and passes between the bars of the screens of the horizontal screens 11 and 12 to reach the normal water channel bottom part. , They pass through the water control gates 7 and 8 and merge at the downstream end of the flow guide wall 4.

In the course of this flow, the dust 15 floating on the surface of the flowing water stays on the upstream surface of the descending walls 9 and 10, and the dust 16 flowing mixed with the flowing water flows on the horizontal screens 11 and 12. Captured on the bottom surface.
FIG. 1 is a plan view showing this state, and FIG. 2 is a cross-sectional view. The state of the cross-sectional view at this time is the same on the right side and the left side of the flow guide wall 4, but in FIG. 2, reference numerals are assigned as divided water channels on the right side of the flow guide wall 4.

If the dust removal operation is performed in this state, the operation is as follows. For example, the dust removal operation is performed in the divided water channel on the right side of the flow guide wall 4.
First, the upstream water control gate 5 and the downstream water control gate 7 are fully closed. FIG. 3 is a cross-sectional view of the right divided water channel in this state.
In the state of FIG. 3, the part of the right divided water channel surrounded by the upstream water control gate 5, the downstream water control gate 7 and the flow guide wall 4 is closed, and the water flow is stopped. Yes.

On the other hand, the divided waterway on the left bank is in the state shown in FIG. However, since the effective water channel width is halved, the head loss is increased, the water level slightly rises upstream of the water control gate 5, and the water level drops slightly downstream of the water control gate 7.
Therefore, as soon as the state of FIG. 3 is reached, if the drainage gate 13 is fully opened and the enclosed water is discharged, the dust 15 and 16 are discharged from the drainage gate 13 together with the water out of the irrigation channel. Since the amount of water flowing out at this time is limited to that existing in the part surrounded by the water control gate 5 and the water control gate 7, the water level on the upstream side and downstream side of the irrigation channel is lost at the same time as the outflow is completed in a short time. Therefore, water use obstacles such as lowering the water level downstream are alleviated.
As soon as the drainage of the water containing the dust 15 and 16 is finished, the drain gate 13 is closed and the water control gates 5 and 7 are fully opened.
As a result, the flow of the irrigation channel is restored to the state shown in FIG. FIG. 5 is a plan view showing this state, and the dusts 15 and 16 have disappeared from the divided water channel on the right side of the flow guide wall 4.

What has been described above is the dust removal operation of the divided irrigation channel on the right bank side, but the dust removal operation of the divided irrigation channel on the left bank side can also be performed in the same procedure.
In this way, in this embodiment, it is possible to discharge the dust mixed in the running water together with a small amount of water while minimizing water utilization problems such as lowering the water level downstream of the irrigation channel.
In this embodiment, since the drainage gates are provided on the side walls on both sides of the irrigation channel, for example, it is preferable that the irrigation channel be installed as a channel bridge over a mountain stream.

FIGS. 6 to 10 show another embodiment of the dust removal device for the irrigation channel according to the present invention, FIG. 6 is a plan view of the dust removal device for the irrigation channel according to this embodiment, and FIG. 7 shows the divided irrigation channel on the right bank side. Both cross-sectional views show the normal water flow state, FIG. 8 shows the state where the dust removal operation is started in the cross-sectional view of the central divided irrigation channel, and FIG. 9 shows the cross-sectional view of the divided irrigation channel on the left bank side and the drainage gate FIG. 10 is a plan view showing a state in which the dust removal operation of the divided irrigation channel on the left bank side is completed and the normal water flow state is restored.

6, 7, 8, 9, and 10, a portion 1 in which the irrigation channel in the middle of the irrigation channel is bent 90 ° to the left is selected to provide a lower portion 1 of the channel, and an upstream normal position A section including a slightly long portion 2 having a bottom of the water channel and a slightly long portion 3 having a bottom of the water channel at a normal position downstream thereof is defined as a section of a dust removing device. At the same time as dividing into three, the left and right relations of the divided irrigation channels are reversed by providing underdrains at appropriate places.

That is, before the irrigation channel bends to the left, the flow guide walls 21 and 22 are provided to divide the width of the irrigation channel into three, and the water control gate 24 is installed at the entrance of the right divided irrigation channel, and the central division is performed. A water control gate 25 is installed at the entrance of the irrigation canal, and a water control gate 26 is installed at the entrance of the divided water supply channel on the left side.
Among them, in the divided water channel on the right side, the length of the portion 2 having the water channel bottom at the normal position downstream of the water control gate 24 is short, and immediately becomes the portion 1 in which the water channel bottom is lowered. There is a drain gate 36 from the bottom of the lower channel on the right side of the lower portion 1 of the channel, and a culvert that goes in the left direction from the lower channel channel below the down wall 30 on the right side of the flow guide wall 20. There are 39 entrances. The underdrain 39 reaches under the horizontal screen 33 after diving under the central divided water channel and the left divided water channel. On the downstream side of the horizontal screen 33, a backflow prevention flap gate 27 installed at the upper part of the irrigation channel in the portion 3 having the water channel bottom at a normal position and lowering the center of gravity of the door body is installed as a downstream water control gate. Then , the flow guide wall 22 ends on the downstream side, and the divided portion of the irrigation channel ends.
The divided irrigation channel is located on the right side of the irrigation channel between the right bank side wall and the diversion wall 20 in the upstream, but is located on the left side of the irrigation channel between the diversion wall 22 and the left bank side wall in the downstream. ing.
Further, in the centrally divided irrigation channel, the portion 2 having the water channel bottom at the normal position downstream of the water control gate 25 exceeds the culvert 39 and becomes slightly longer, and then the portion 1 where the water channel bottom is lowered. It becomes.

There is a drain gate 37 from the bottom of the lower water channel on the right side of the lower part 1 of the channel bottom, and on the left side below the down wall 31 on the right side of the flow guide wall 21, it proceeds in the left direction from the lower water channel bottom. There is a culvert 40 entrance. The underdrain 40 reaches under the horizontal screen 34 after diving under the left divided water channel.
On the downstream side of the horizontal screen 34, a backflow prevention flap gate 28 is installed as a downstream water control gate in the portion 3 having the water channel bottom at a normal position , and the flow guide walls 22 and 23 are terminated at the downstream portion thereof. Splitting ends.
The divided irrigation channel is located in the center between the flow guide walls 20 and 21 in the upstream, and is also located in the center between the flow guide walls 22 and 23 in the downstream.
Further, in the divided water channel on the left side, the portion 2 having the water channel bottom at the normal position downstream of the water control gate 26 is the longest to exceed the underdrains 39 and 40, and thereafter the water channel bottom. It becomes the part 1 which made low.

There is a drain gate 38 from the bottom of the lower water channel at the back right side of the lower part 1 of the water channel bottom, a down wall 32 is on the left side, and a horizontal screen 35 is located under the lower wall.
On the downstream side of the horizontal screen 35, a backflow prevention flap gate 29 is installed as a downstream water control gate in the portion 3 having the water channel bottom at a normal position , and the flow guide wall 23 ends at the downstream portion to divide the water channel. finish.
The divided irrigation channel is located on the left side of the irrigation channel between the left bank side wall and the diversion wall 21 in the upstream, but is located on the right side of the irrigation channel between the diversion wall 23 and the right bank side wall in the downstream. Yes.
In this embodiment, in the portion 1 where the bottom of the water channel is lowered by utilizing the fact that the water channel bends to the left, and in the portion having the water channel bottom in the normal position upstream and downstream, two sets of flow guide walls each upstream and downstream As a result of reversing the left and right positional relationship of the three divided irrigation channels by placing the two culverts at appropriate positions, the three drainage gates 36, 37, 38 are concentrated on the right bank of the irrigation channel. And the floor height of each drainage gate has succeeded in making it equal to the height of the channel bottom of the part 1 which made the bottom of the channel low.

Naturally, if the case where the irrigation channel turns to the right is used, the three drainage gates can be concentrated on the left bank of the irrigation channel.
In this embodiment, the width of the irrigation channel is divided into two in comparison with the case where the number of divisions is two, so that the downstream water level drop that occurs when the dust is sequentially removed one by one. Water use obstacles are further reduced.
In addition, it is technically possible to divide the width of the irrigation channel into 4 or 5 or the like, and when the number to be divided is n, in this dust removal apparatus, each upstream and downstream (n-1) A set of flow guide walls and (n-1) culverts may be arranged at appropriate positions. However, increasing the number of divisions to 4 or more is often not a good idea due to increased equipment costs.

In this embodiment, the backflow prevention flap gates 27, 28 and 29 are employed as the downstream water control gates. The flap gates 27, 28, and 29 are opened and closed by a shaft 42 supported by a bearing 43 that is set on the side walls of the irrigation channel and the top ends of the flow guide walls 22 and 23. If it is slightly downstream from the center of the shaft 42 and no external force is applied, each of the divided irrigation channels is closed, but when pushed from the upstream by the water flow, it rotates around the shaft 42 and opens downwardly. And the water flow is configured to move in the downstream direction.
In this way, if a flap gate for backflow prevention is adopted for the downstream water control gate, it is more economical than installing a general slide gate, etc., and this flap gate is automatically operated according to the sequence of operation. This is advantageous because

FIG. 6 is a plan view of a normal water flow state of this embodiment, and FIG. 7 is a cross-sectional view of the rightmost divided irrigation channel in a normal water flow state. In FIG. 7, the dust 15 that has floated and floated on the water stays in the vicinity of the descending wall surface 30 located above the entrance of the underdrain 39 on the right side of the flow guide wall 20, and the dust 16 that has flowed in the water is horizontal. It is captured on the lower surface of the screen 33.

As shown in FIG. 8, in the divided irrigation channel at the center, the dust 15 floating in the water stays in the vicinity of the descending wall surface 31 located above the entrance of the underdrain 40 on the right side of the flow guide wall 21. However, the dust 16 that has flowed in the water is captured by the lower surface of the horizontal clean 34.

Furthermore, as shown in FIG. 9, in the divided irrigation channel on the left side, the dust 15 that floats on the water stays on the front surface of the descending wall 32 continuing from the flow guide wall 23 and is mixed with water. The dust 16 that has flown is captured on the lower surface of the horizontal screen 35.

FIG. 10 is a plan view showing a state in which the dust 15 has disappeared from the front surface of the descending wall 32 and the dust 16 has disappeared from the lower surface of the horizontal screen 35 as a result of performing the dust removal operation on the divided water channel on the left side.

In the dust removal apparatus for the irrigation canal in any of the above-described embodiments, a drop work or overflow weir is installed instead of the downstream water control gate, and the wastewater flows backward from the downstream of the irrigation canal during drainage operation. It can also be configured to reduce water flow.

In the irrigation canal where the water from the river is taken to the place where the water is taken and used for the increased use of water in recent years, the dust removal apparatus of the present invention separates the dust that floats and mixes with the water from the water. It was developed to do that.
There are many uses such as agricultural water, hydroelectric power plants, and waterworks.
In particular, the dust removal apparatus of the irrigation channel according to the present invention may not return the collected and separated dust to the river again when the dust flowing in the mountainous or rural areas is harmless organic matter such as fallen leaves. It was assembled starting from the idea of the heel.

The dust removal device for the irrigation channel of the present invention captures and separates dust from water without operating precise mechanical parts underwater, and has low equipment costs, low operating costs, and few failures, so maintenance is easy. is there. In addition, it is easy and inexpensive to automate a gate (sluice) operation system that opens and closes for dust removal.
Therefore, a dust collection box having a large volume having a large drainage net surface is placed downstream of the drain gate of the dust removal device of the irrigation canal according to the present invention, and the dust is captured again and appropriately lifted by a crane. It is also possible to reverse and spread it over the work floor so that sorting work etc. can be performed safely and efficiently.
The dust collection and disposal system configured as described above can be provided as a system that is sufficiently economical and durable as a whole.

1 shows an embodiment of a dust removal device for a water channel according to the present invention, and is a plan view of a normal water flow state. It is sectional drawing of the normal water flow state of the water channel divided on the right side. It is sectional drawing of the state which started dust removal operation of the water channel divided | segmented on the right side. It is sectional drawing of the state which opened the drainage gate of the divided canal on the right side, and discharged | emitted the dust with water. It is a top view of the state which the dust removal operation of the water channel divided | segmented on the right side was complete | finished, and returned to the normal water flow state. The other example of the dust removal apparatus of the water channel of this invention is shown, and it is a top view of a normal water flow state. It is sectional drawing of the normal water flow state of the water channel divided on the right side. It is sectional drawing of the state which started dust removal operation of the center divided water channel. It is sectional drawing of the state which opened the drainage gate of the divided canal on the left side, and discharged | emitted the dust with water. It is a top view of the state which the dust removal operation of the divided water channel of the left side was complete | finished, and returned to the normal water flow state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower part 2 Part 3 Part 4 Flow guide wall 5 Water control gate 6 Water control gate 7 Water control gate 8 Water control gate 9 Down wall 10 Down wall 11 Horizontal screen 12 Horizontal screen 13 Drain gate 14 Drain gate 15 Dust 16 Dust 20 Diversion Wall 21 Diversion Wall 22 Diversion Wall 23 Diversion Wall 24 Water Control Gate 25 Water Control Gate 26 Water Control Gate 27 Flap Gate 28 Flap Gate 29 Flap Gate 30 Down Wall 31 Down Wall 32 Down Wall 33 Horizontal Screen 34 Horizontal screen 35 Horizontal screen 36 Drain gate 37 Drain gate 38 Drain gate 39 Underdrain 40 Underdrain 41 Counterweight 42 Rotating shaft 43 Bearing

Claims (4)

A part (1) with an appropriate length in the middle of the irrigation channel and a lower bottom of the irrigation channel is provided (1), and the parts (2) and (3) having the channel bottoms at the normal positions of the upstream and downstream irrigation channels A section including the basin is also installed, and a series of flow guide walls (4) that divide the channel width into two are installed.
Two water control gates (5) and (6) for opening and closing each divided water channel are provided at the upstream end of the flow guiding wall (4), and at the same time, each divided water channel is also opened and closed at the downstream end 2 Gate water control gates (7), (8) will be provided.
Furthermore, at the same time as providing the downstream wall (9), (10) from the top of the water channel side wall and the diverting wall (4) to the position of the normal water channel bottom, which is divided in the middle of the irrigation channel having a lower water channel bottom, A horizontal screen (11), (12) is provided at the position of the normal water channel bottom in the entire portion where the bottom of the water channel downstream from the descending walls (9), (10) is lowered.
In addition, in each divided water channel, drain gates (13), (14) for opening and closing drain ports provided in the side wall of the portion (1) where the bottom of the water channel upstream of the descending walls (9), (10) is lowered 1) each.
When the water flowing down the irrigation channel reaches the part (1) where the bottom of the water channel is lowered, it is pushed down by the descending walls (9) and (10) and reaches the downstream of the descending walls (9) and (10). It passes through the horizontal screens (11) and (12) provided at the position of the normal water channel and floats down to the portion (3) having the water channel bottom at the normal position of the downstream water channel.
The dust that floats on the surface of the flowing water stays on the upstream surface of the descending walls (9) and (10), and the dust that flows mixed with the flowing water flows on the horizontal screens (11) and (12). Captured on the bottom surface.
Therefore, in one of the two divided water channels, the upstream and downstream water control gates (5) and (7) or (6) and (8) are kept fully open and at the same time divided into two. In the state where the drainage gate (13) or (14) of the irrigation channel is held fully closed, the upstream and downstream water control gates (6) and (8) or (5) and (7) in the other of the two divided irrigation channels. If the drainage gate (14) or (13) is shifted from fully closed to fully open after shifting from fully open to fully closed, the upstream and downstream water control gates (6) and (8) or (5) and (7) The water trapped in the two-divided part of the irrigation channel surrounded by () is suspended in the front of the descending wall (10) or (9) and the horizontal screen (12) or (11) Along with dust trapped on the bottom Water gate (14) or (13) is discharged out of the canal. When the discharge is finished, close the drainage gate (14) or (13) that is fully open, then open the upstream and downstream control gates (6) and (8) or (5) and (7). You can return to the state.
At this time, in one of the two divided irrigation channels, either one of the upstream and downstream water control gates (5) and (7) or (6) and (8) is kept fully open, and is divided into the same two parts. Since the drainage gate (13) or (14) of the irrigation channel is fully closed, the water flowing down this portion does not interrupt the water flowing downstream in the irrigation channel. Moreover, the running water blocked by the upstream water control gate (6) or (5) does not overflow.
In this way, one and the other of the water channels with the water channel width divided into two are alternately used for dust removal and water flow, and the dust mixed in the flowing water is discharged out of the water channel. apparatus. In the irrigation dust removal apparatus of Claim 1,
An apparatus for removing dust from an irrigation channel characterized by having a structure in which the direction of the irrigation channel is bent by 90 ° horizontally before the descending wall on the downstream side of the water control gate upstream of the two gates. In the dust removal apparatus of the water channel of Claim 1 or 2, The door body protruded diagonally downward toward the downstream side from the rotating shaft provided in the upper part of the downstream water control gate position, and protruded in the opposite direction to the door body as a whole Adopting a backflow prevention flap gate with a weight that adjusts so that the center of gravity of the shaft is near the center of the rotation axis, it is unlikely to block the water flow in the downstream direction of the irrigation channel, and in the downstream direction of the irrigation channel when discharging dust A dust removal device for a water channel, characterized in that it is configured to prevent water flowing backward from the water to the drain outlet. 4. A dust removal apparatus for a water channel according to any one of claims 1 to 3 , wherein a dust collection box having a sufficiently large volume having a large drainage net surface is placed downstream of the drainage gate to capture the dust again, and the dust collection box as appropriate. A dust removal device for an irrigation channel characterized in that it is lifted up by a crane to perform separation and incineration processing and disposal.

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