JP2020110805A - Transfer device - Google Patents

Abstract

To provide a transfer device devised so that rolling-up of sand is suppressed while sufficiently moving the sand.SOLUTION: A transfer device for transferring sand being sand contained in received water that has settled and deposited, comprises: a trough 3 which extends in a predetermined direction and constitutes a transfer path in which the settled sand is deposited; a discharge port 72 which discharges a fluid in the predetermined direction onto the sand deposited in the transfer path; and a covering member 38 which covers from above, a portion on an axis extending from the center of the discharge port 72 toward the predetermined direction, in the transfer path. A discharge port 71 is disposed at a position alienated from an inner peripheral surface 310 of the trough 3, and its height direction expands in a droop width direction to form a laterally long shape.SELECTED DRAWING: Figure 8

Description

The present invention relates to a transfer device for transferring the sedimented and deposited sand contained in received water.

The sewage treatment system receives wastewater such as sewage or rainwater, settles the sand contained in the wastewater to the bottom of the pond, and then moves in a predetermined direction to collect the sand accumulated at the bottom of the pond, and gathers it. Some have a settling basin that removes sand from sewage. It is known that this sand basin is provided with a sand collecting means for moving the sand accumulated at the bottom of the basin in a predetermined direction by the flow of the fluid discharged from the discharge port. In the sand collection using this fluid, the deposited sand may be rolled up by the discharged fluid, and it is important how to suppress the rolling up of the sand. Conventionally, inclined plates inclined downward in a predetermined direction are arranged at intervals above a transfer path extending in a predetermined direction, and the inclined plates are used to prevent the sand from rolling up (for example, See Patent Document 1).

JP, 9-70503, A

However, in the inclined plate shown in Patent Document 1, the inclined plate is arranged so as to face the discharge direction of the fluid from the discharge port, the fluid discharged from the discharge port is blocked, and the sand is sufficiently sanded. May not move to. Therefore, if the discharge pressure of the discharge port is increased in order to move the sand sufficiently, then the sand may wind up along the inclined plate due to the force of the discharged fluid.

In view of the above circumstances, it is an object of the present invention to provide a transfer device that is devised so as to prevent the sand from rolling up while sufficiently moving the sand.

The transfer device of the present invention which solves the above object,
In a transfer device that transfers the sedimented and deposited sand contained in the received water,
A transfer path constituent member that extends in a predetermined direction and forms a transfer path on which sedimented sand is deposited;
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member for covering, from above, an axial portion of the transfer path extending from the center of the discharge port toward the predetermined direction,
The discharge port is arranged at a position separated from the inner peripheral surface of the transfer path forming member, and has a horizontally long shape in which the height direction is collapsed and expanded in the width direction.

In this transfer device, the discharge port may be positioned such that both ends in the width direction are located inside both ends in the width direction of the covering member.

According to the present invention, it is possible to provide a transfer device that is devised so as to prevent the sand from rolling up while sufficiently moving the sand.

It is the top view which looked at the sand basin which can apply the transfer device of the present invention from the upper part. It is an AA sectional view of the sand basin shown in FIG. (A) is a perspective view mainly showing a connecting portion of a first U-shaped member and a second U-shaped member, and (b) of the connecting portion shown in (a) of the same figure. FIG. 2A is a sectional view taken along line CC of FIG. 2 showing a trough and a discharge nozzle, and FIG. 4B is a plan view of the portion shown in FIG. 4A from below the cover member 38. FIG. 5 is a DD cross section of FIG. 2. (A) is a partial cross-sectional view showing an enlarged vicinity of the most upstream end of the first U-shaped member, and (b) is a partial cross-sectional view of (a) as viewed from the left. It is a block diagram of the water supply equipment provided in the sand basin shown in FIG. It is a figure which shows an example of embodiment of this invention which changed the shape of a cover member, arrangement|positioning position, or the shape of a trough. FIG. 8A is a diagram showing a modification of the example shown in FIG. 8D, and FIG. 8B is a diagram showing a modification of the example shown in FIG. 8C. It is a fragmentary sectional view showing a modification of a discharge nozzle. It is sectional drawing which cut|disconnected the sand basin 10 which is 2nd Embodiment at the center of the width direction. It is a block diagram of the water supply equipment provided in the sand basin 10 shown in FIG. It is the schematic diagram which looked at the sand basin 100 which is 3rd Embodiment from the sand collection pit side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. A sand basin, which is an embodiment to which the transfer device of the present invention can be applied, is arranged on the upstream side of a sewage treatment system, and after the sand contained in wastewater such as sewage or rainwater is settled, the settled sand is collected. It is moved to the sand pit and removed from the sewage.

1 is a plan view of a sand basin 1 to which the transfer device of the present invention can be applied, and FIG. 2 is a cross-sectional view of the sand basin 1 shown in FIG.

As shown in FIG. 1, the sand basin 1 is a rectangular pond in plan view including a dust remover 2, a trough 3 as a transfer path constituent member of the present invention, a sand collecting pit 4, and a pump well 5. is there. Hereinafter, the long side direction of the sand basin 1 may be referred to as the longitudinal direction, and the short side direction may be referred to as the width direction. The settling basin 1 shown in FIG. 1 receives sewage from the right side of the figure, and the received water slowly flows toward the left side of the figure (see the straight line arrow shown in FIG. 2). That is, the longitudinal direction of the sand basin is the direction of water flow, and in FIGS. 1 and 2, the right side of the figures is the upstream side and the left side is the downstream side.

The dust remover 2 is used to remove contaminants (residuals) mixed in the wastewater that has flowed into the sand basin 1, and is installed upstream of the trough 3. The dust remover 2 has an endless chain 21, a plurality of rakes 22 attached to the endless chain 21 at intervals, and a filter screen 23 submerged in water. The endless chain 21 is provided in a state of standing upright on both sides of the sand basin 1 in the width direction, and as shown in FIG. 2, it is wound around the ground side sprocket 211 and the bottom sprocket 212. There is. When the endless chain 21 is driven, the rake 22 moves in and out of the water. The filtration screen 23 is arranged on the downstream side of the endless chain 21. The filter screen 23 has bars extending in the vertical direction arranged at a predetermined interval (for example, 25 mm to 75 mm), and blocks the passage of contaminants having a size larger than the predetermined interval. The contaminants blocked by the filter screen 23 are scraped up by the rake 22, and the scraped contaminants are placed on a transportation means such as a belt conveyor (not shown) on the ground side.

The trough 3 is provided at the bottom of the sand basin 1. An inclined surface 6 is provided at the bottom of the pond as described later, and a trough 3 is provided so as to connect to the inclined surface 6. The sand in the wastewater that has flowed into the sand basin 1 sinks toward the bottom of the sand on the upstream side of the sand basin 1 and accumulates on the bottom of the sand.

The pump well 5 stores wastewater from which sand has been removed. The pump well 5 is arranged on the most downstream side of the sand basin 1. Further, as shown in FIG. 2, the bottom of the pump well 5 is the deepest part of the sand basin 1. A pumping pump 51 is provided inside the pump well 5. The pumping pump 51 moves the wastewater stored in the pump well 5 to the outside of the sand basin 1. A pumping pipe 52 is connected to the pumping pump 51. The dirty water sucked by the pump 51 is sent to a settling tank (not shown) through the pump pipe 52. WL shown in FIG. 2 represents the water surface of the sewage. The position of the water surface WL changes depending on the amount of sewage flowing into the sand basin 1 within a range in which the height from the bottom surface of the trough 3 is, for example, 1 m or more and 5 m or less.

A sand collecting pit 4 is provided in the portion of the bottom of the pond upstream of the pump well 5. A sand pump 41 is provided inside the sand collecting pit 4. The sand raising pump 41 is arranged near the bottom surface of the sand collecting pit 4 and conveys the sand collected in the sand collecting pit 4 to the outside of the sand basin 1. A sand lifting pipe 42 is connected to the sand lifting pump 41. The sand sucked by the sand lifting pump 41 is sent to the outside of the sand basin 1 through the sand lifting pipe 42.

The trough 3 is provided in the center of the sand basin 1 in the width direction as shown in FIG. 1, and extends in a predetermined direction from a position downstream of the dust remover 2. That is, it extends toward the sand collecting pit 4. The sand accumulated on the trough 3 is moved to the sand collecting pit 4 by the flow of water discharged from the discharge port described later. In FIG. 1, the discharge axis L extending from the center of the discharge port in the predetermined direction is shown by a one-dot chain line. In other words, the ejection axis L is an extension line obtained by extending the center line of the ejection port in a predetermined direction, and corresponds to an example of the axis referred to in the present invention.

The sand basin 1 shown in FIG. 1 also includes a covering member 38 that covers the discharge shaft L of the trough 3 from above. The length of the covering member 38 is the same as the entire length of the trough, and the covering member 38 extends along the trough 3. A detailed description of the cover member 38 will be given later.

The trough 3 includes a first U-shaped member 31, a second U-shaped member 32, a third U-shaped member 33, a first connecting member 34, and a second connecting member 35. It consists of and. The first connecting member 34 connects the first U-shaped member 31 and the second U-shaped member 32. Further, the second connecting member 35 connects the second U-shaped member 32 and the third U-shaped member 33. In the present embodiment, the length of each U-shaped member 31, 32, 33 in the longitudinal direction is 5 m. Each of the U-shaped members 31, 32, and 33 is a stainless steel plate material having a plate thickness of 4 mm and formed into a U-shaped cross section.

FIG. 3A is a perspective view showing mainly the connection points of the first U-shaped member 31 and the second U-shaped member 32. In FIG. 3A, the trough 3 is shown as transparent. Further, FIG. 3B is a partial cross-sectional view of the connection portion shown in FIG. The arrow in FIG. 3 indicates the moving direction of sand.

As shown in FIG. 3( a ), the first U-shaped member 31 and the second U-shaped member 32 are composed of a semi-cylindrical portion that is a lower portion and two plane portions that are an upper portion. It is configured. The first U-shaped member 31 and the second U-shaped member 32 are different in the inner diameter of the semi-cylindrical portion and the distance between the flat portions in the width direction. In the present embodiment, the inner diameter of the semi-cylindrical portion of the first U-shaped member 31 and the widthwise spacing of the flat portion are each 300 mm, and the inner diameter of the semi-cylindrical portion of the second U-shaped member 32 and The distance between the flat portions in the width direction is 350 mm. The first connection member 34 is made by processing a stainless steel plate material having a plate thickness of 4 mm. The first U-shaped member 31 and the first connecting member 34 are joined by welding, and the second U-shaped member 32 and the first connecting member 34 are also joined by welding.

The third U-shaped member 33 and the second connection member 35 shown in FIGS. 1 and 2 are also formed of a stainless steel plate material having a plate thickness of 4 mm. The inner diameter of the semi-cylindrical portion of the third U-shaped member 33 and the widthwise interval of the flat portion are 400 mm, respectively. The connecting points of the second U-shaped member 32 and the third U-shaped member 33 have the same structure as the connecting points shown in FIG.

The inner peripheral surface 310 of the first U-shaped member 31, the inner peripheral surface 320 of the second U-shaped member 32, the inner peripheral surface (not shown) of the third U-shaped member 33, and the first connecting member. The groove forming wall 30 is constituted by the downstream side surface 340 of the second U-shaped member 32, the downstream side surface (not shown) of the second U-shaped member 32, and the downstream side surface 360 of the end surface wall 36 (see FIG. 6A) described later. .. This groove forming wall 30 forms a groove G that extends in the longitudinal direction from the upstream side of the sand basin 1 to the sand collecting pit 4, and the most downstream end of the groove G is connected to the sand collecting pit 4. There is. A space from the bottom of the groove G to a height position of about 3/4 is assumed as the transfer path.

As shown in FIG. 3B, the wall bottom portion 300 of the groove forming wall 30 has a stepped shape that gradually becomes deeper toward the sand collecting pit 4 on the downstream side. Also in FIG. 3B, the right side of the figure is the upstream side and the left side is the downstream side. The wall bottom portion 300 includes a first extending portion 301 serving as a staircase-shaped upper step portion, a second extending portion 302 serving as a staircase-shaped lower step portion, and a step connecting the staircase-shaped upper step portion and the lower step portion. And a part 303. The first extending portion 301 and the second extending portion 302 extend in the longitudinal direction. In the present embodiment, the first extending portion 301 and the second extending portion 302 extend horizontally toward the sand collecting pit 4, but are inclined downward toward the sand collecting pit 4. It may be one. The step portion 303 is a portion that is perpendicular to the first extending portion 301 and the second extending portion 302. The step portion 303 is provided with a first discharge port 71 for discharging water. By providing the first discharge port 71 in the step portion 303, when the water in the groove G is moved by discharging water from the discharge port on the upstream side (the second discharge port 72 described later), the first discharge port 71 is formed. It is possible to prevent the discharge port 71 from interfering with the movement of sand. It should be noted that the ejection opening areas of the first ejection opening 71 and the second ejection opening 72 in this embodiment are both 2037 mm 2. On the upstream side of the first ejection port 71, the ejection nozzle 7 that forms an empty chamber 75 connected to the first ejection port 71 is provided. The discharge nozzle 7 is fixed to the lower portion of the first U-shaped member 31. Further, a part of the outer peripheral surface 311 of the first U-shaped member 31 is a part of the inner wall of the discharge nozzle 7. By doing so, the structure of the discharge nozzle 7 can be simplified, and the thickness of the discharge nozzle 7 in the vertical direction can be reduced.

4A is a cross-sectional view taken along the line CC of FIG. 2 showing the trough 3 and the discharge nozzle 7, and FIG. 4B shows the portion shown in FIG. 4A from below the cover member 38. It is a top view. 4(a) and 4(b), the plate thickness of the trough 3 and the discharge nozzle 7 is exaggerated.

As shown in FIG. 4A, the discharge nozzle 7 includes a fluid receiving port 76 that projects in the width direction from the first U-shaped member 31. A first water supply pipe 21 (see FIG. 7) for supplying water is connected to the fluid receiving port 76. As shown in FIG. 4B, the vacant chamber 75 is L-shaped in plan view. Water flowing from the fluid receiving port 76 into the vacant chamber 75 changes its flow direction to the downstream side in the vacant chamber 75, becomes parallel to the second extending portion 302, and flows along the second extending portion 302. It is discharged from the first discharge port 71. By discharging water along the second extending portion 302, the sand accumulated in the groove G can be efficiently moved along the groove G.

Moreover, as shown in FIG. 4A, the height positions of the upward opening of the first U-shaped member 31 and the upward opening of the second U-shaped member 32 are aligned. There is. That is, the height positions of the upper edge 312 of the first U-shaped member 31 and the upper edge 322 of the second U-shaped member 32 are the same.

Further, FIG. 4A also shows a cover member 38 having an inverted V-shaped cross section. That is, FIG. 4A shows the first covering member 381 located above the first U-shaped member 31 and the second covering member 382 located above the second U-shaped member 32. Has been done. Although not shown here, a third covering member 383 (see FIG. 5) is arranged above the third U-shaped member 33. In the following description, the first covering member 381, the second covering member 382, and the third covering member 383 are collectively referred to as the covering member 38. The cover member 38 is for preventing the sand from being rolled up by the fluid discharged from the discharge port. The covering member 38 is supported by supporting members 39 fixed to the upper ends of both sides of the trough 3. The support members 39 are provided at predetermined intervals in the extending direction of the trough 3, and the space 37 between the support members 39 and the supporting members 39 in the extending direction of the trough 3 is open upward (FIG. 1). reference). The length of the support member 39 in the extending direction is equal to or longer than the predetermined interval in the filter screen 23, and is 200 mm here. By setting the length of the support member 39 in this manner, it is possible to prevent the contaminants (stain residue) that have passed through the filtration screen 23 from being wrapped around the support member 200. Further, it is preferable that the support member 39 is arranged at least near the downstream side of the discharge port. The sand is most likely to be rolled up in the vicinity of the downstream side of the discharge port, and the support member 39 also serves as a covering member, so that the sand can be more effectively prevented from rolling up. In addition, in this embodiment, the cover member 38 and the support member 39 are integrally formed.

The cover member 38 is formed by bending a single plate member at 90 degrees, has flat plate-shaped inclined portions 380 formed on both sides in the width direction of the trough 3, and has a sharp upper end 38a. The inclined portion 380 is inclined downward at an angle of 45 degrees in the width direction of the trough 3. The sand also settles on the cover member 38, but since the upper end 38a is sharp, it is difficult for the sand to deposit on the upper end 38a portion, and the sand settling on the cover member 38 passes through the inclined portion 380, It becomes easy to flow into the trough 3 from the space 37 (see FIG. 1) between the support members 39. Further, the height position of the lower end 38b of the covering member 38 having an inverted V-shaped cross section in the present embodiment is such that the upper edge 312 of the first U-shaped member 31 and the upper edge 322 of the second U-shaped member 32. Matches the height position of.

It is preferable that the supporting member 39 also be provided with an inclined portion similarly to the cover member 38. That is, it is preferable that the upstream half of the support member 39 be inclined downward toward the upstream side and the downstream half be inclined downward toward the downstream side. By doing so, it is possible to prevent sand from accumulating on the support member 39.

5: is a figure which shows the pond bottom side of the DD cross section of FIG. As in FIG. 4 described above, FIG. 5 is also a view when the cross section is taken at a position where the support member 39 is not present. The background is omitted in FIG. Therefore, although the third cover member 383 is shown in FIG. 5, the first cover member 381 and the second cover member 382, which should be visible on the back side, are omitted from the drawing, and they should also be visible on the back side. The support member 39 is also omitted in the figure.

As shown in FIG. 5, inclined surfaces 6 are provided on both sides of the trough 3 in the width direction. The inclined surface 6 is inclined 45 degrees downward toward the trough 3 and extends in the longitudinal direction between the uppermost stream end of the sand basin 1 and the upstream end of the sand collecting pit 4. The sand contained in the sewage that has flowed into the sand settling basin 1 settles at the bottom of the basin during the course of the sewage flowing downstream. The sand that has settled on the inclined surface 6 further flows down along the inclined inclined surface 6 toward the trough 3, and the settled sand can be collected in the groove G. FIG. 5 shows a state in which the sand S settled on the inclined surface 6 flows down toward the trough 3, and the sand S is accumulated in the trough 3. In the trough 3 shown in FIG. 5, the sand S is deposited from the bottom of the groove G to a position approximately half the height, and here, water is discharged from a third discharge port 73 (see FIG. 7) (not shown). Then, the inside of the trough 3 becomes a transfer route. The inclination angle of the bottom of the pond may be 30 degrees or 60 degrees, for example.

Further, in FIG. 5, an arrow W representing the length in the transfer path width direction (trough width direction) between the support members 39 and 37 (see FIG. 1) between the support members 39 is shown. This length is also a length equal to or longer than the above-mentioned predetermined interval in the filter screen 23, and is 100 mm here. By setting such a length, the sand S that has flown down along the inclined surface 6 is likely to flow down by the trough 3, and it is possible to prevent clogging of the above-mentioned interval 37. The space 37 between the support members 39 and 37 (see FIG. 1) corresponds to an example of the open portion.

FIG. 6A is an enlarged partial cross-sectional view of the vicinity of the most upstream end of the first U-shaped member 31. In FIG. 6A, the right side of the figure is the upstream side, and the left side of the figure is the downstream side.

As shown in FIG. 6A, a plate-shaped end face wall 36 is attached to the end face that is the most upstream end of the first U-shaped member 31. As described above, the downstream side surface 360 of the end wall 36 forms a part of the groove forming wall 30.

FIG. 6B is a partial sectional view of FIG. 6A viewed from the left side. That is, FIG. 6B is a view of the end wall 36 viewed from the downstream side, and the back side of the paper surface is the upstream side.

As shown in FIG. 6B, the end face wall 36 is provided with a second discharge port 72. An L-shaped pipe 77 that forms an empty chamber 78 connected to the discharge port 72 is provided on the upstream side of the second discharge port 72. The L-shaped pipe 77 is an L-shaped pipe in plan view, and is connected to the second water supply pipe 22 (see FIG. 7) for supplying water. The water flowing into the empty chamber 78 changes its flow direction to the downstream side in the empty chamber 78, becomes parallel to the first extending portion 301, and flows from the second outlet 72 to the first extending portion 301. Is discharged along. By discharging water along the first extending portion 301, the sand accumulated in the groove G can be efficiently moved along the groove G.

FIG. 7 is a block diagram of water supply equipment provided in the sand basin 1 shown in FIG.

A water supply pump P is provided in the sand basin 1. The water supply pump P is a pump that supplies 2000 liters of water per minute. A branch pipe 24 is provided between each water supply pipe 21, 22, 23 connected to each discharge port 71, 72, 73 and the water supply pump P. It should be noted that FIG. 7 shows the third discharge port 73 and the third water supply pipe 23 provided at the step between the second U-shaped member 32 and the third U-shaped member 33. .. Further, the water supply pipes 21, 22, and 23 are provided with electrically operated valves V1, V2, and V3, respectively.

Next, the operation of the sand basin 1 in this embodiment will be described. First, sewage flows into the sand basin 1. When the sewage flowing into the sand basin 1 passes through the dust remover 2 shown in FIG. 2, the contaminants (residuals) mixed in the sewage are removed. The sewage that has passed through the dust remover 2 reaches the upstream end of the trough 3 and further flows in the extending direction of the trough 3. While the sewage flows through the upstream side portion of the trough 3, the sand contained in the sewage sinks to the bottom of the sand basin 1. As described above, in this portion, the sand settled on the inclined sloped surface 6 also flows down along the inclined sloped surface 6 toward the trough 3. Further, the sand that has settled down to the covering member 38 flows down into the trough 3 from the space 37 between the supporting members 39 (see FIG. 1) (see FIG. 1) through the inclined portion 380. Thus, sand is deposited in the groove G.

Next, the water supply pump P is driven and the electric valve V2 is opened. At this time, the electric valves V1 and V3 are closed. The water of 2000 liters per minute supplied by the water supply pump P is discharged from the second discharge port 72 via the branch pipe 24 and the second water supply pipe 22. By continuing this discharge for 5 minutes, the sand in the groove G formed by the inner peripheral surface 310 of the first U-shaped member 31 was formed by the inner peripheral surface of the second U-shaped member 32. Move to groove G. That is, the sand moves to the sand collecting pit 4 side through the transfer route. When the sand moves along the transfer route, the sand is likely to wind up due to the momentum of the water discharged from the second discharge port 72, but the lifted sand hits the covering member 38 and goes further upward. Instead, it fits in the groove G. Since the inclined portion 380 of the covering member 38 is inclined in the width direction of the transfer path, it does not block the water discharged from the second discharge port 72. Further, the inclined portion 380 is not arranged so as to face the discharge direction of water from the second discharge port 72, and it is difficult for sand to wind up along the inclined portion 380.

According to the research conducted by the present inventor, a U-shaped member having the same shape as the first U-shaped member 31 in a sand basin filled with sewage until the bottom of the inner peripheral surface of the U-shaped member reaches a position where the water depth is 2 m. Using a U-shaped member, sand is further deposited from the upper part of the U-shaped member up to about 100 mm, and at a discharge flow rate of 16 m/sec, 3000 liters per minute, 2000 liters per minute, and 1000 liters per minute of water are discharged from the discharge port. It was found that when the water was discharged, the sand could not be moved efficiently even if the discharge time was increased unnecessarily, and the time for discharging the water that can move the sand efficiently was about 5 minutes. Further, when the discharge time of water is 5 minutes, when sand of 1000 liters is discharged per minute, the movement distance of sand is slightly over 6 m, and when 2000 liters per minute, the movement distance of sand is about 12 m and 3000 minutes per minute. It was also found that in liters, sand traveled about 18 meters.

When water is continuously discharged from the second discharge port 72 for 5 minutes, the electric valve V2 is closed and the electric valve V1 is opened. As a result, 2000 liters per minute of water supplied by the water supply pump P is discharged from the first discharge port 71. By continuing this discharge for 5 minutes, the sand in the groove G formed by the inner peripheral surface 320 of the second U-shaped member 32 was formed by the inner peripheral surface of the third U-shaped member 33. Move to groove G. That is, the sand further moves to the sand collecting pit 4 side through the transfer route. Also at this time, the sand is likely to wind up due to the momentum of the water discharged from the first discharge port 71, but like the above description, the covering member 38 suppresses the windup.

After that, the electric valve V1 is closed and the electric valve V3 is opened. As a result, 2000 liters per minute of water supplied by the water supply pump P is discharged from the third discharge port 73. By continuing this discharge for 5 minutes, the sand in the groove G formed by the inner peripheral surface of the third U-shaped member 32 moves to the sand collecting pit 4. That is, the sand reaches the sand collecting pit 4 side through the transfer route. Also at this time, the sand is likely to wind up due to the momentum of the water discharged from the third discharge port 73, but like the above, the covering member 38 suppresses the windup.

Finally, the water supply pump P is stopped, the electric valve V3 is closed, the sand pump 41 is driven, and the sand moved to the sand collecting pit 4 is conveyed to the outside of the sand basin 1.

In this embodiment, it is premised that the discharge flow rate control from each discharge port is the most effective in order to move the accumulated sand efficiently by a predetermined distance. The discharge flow velocity of water at the outlets 71, 72, 73 is not limited to any value, and the discharge flow velocity is preferably 8 m/sec or more and 24 m/sec or less. If it is less than 8 m/sec, the flow velocity will be insufficient as expected, and there may be a case where the sand cannot be moved a predetermined distance in relation to the water pressure. If the sand cannot be moved by a predetermined distance, a large number of discharge ports are required in the sand movement direction, and the number of pipes to the discharge ports also increases, which is uneconomical because of a large number of devices. If it is faster than 24 m/sec, it cannot be said that there is no risk that sand will come out upwards between the support members 39 and 37 (see FIG. 1), so for safety, discharge flow velocity Is preferably suppressed to 24 m/sec or less. Furthermore, when using sewage as sand collecting water, there is a risk that the pipe will have a small diameter and dust will be clogged. The water discharge pressure at each of the discharge ports 71, 72, 73 is 0.1 MPa or more and 0.3 MPa or less.

As described above, in the sand basin 1 of the present embodiment, it is possible to prevent the sand from rolling up by the covering member 38 while sufficiently moving the sand. In addition, the discharge ports 71, 72, 73 are arranged at intervals in the extending direction (longitudinal direction) of the groove G, and 2000 liters of water per minute is sequentially introduced into the groove G from the respective discharge ports 71, 72, 73. Since it is discharged, the sand accumulated in the groove G can be efficiently moved by a predetermined distance.

In the following description, differences from the previously described sand basin 1 will be mainly described. In addition, the same reference numerals as those used so far may be given to the names of the constituents that are the same as the names of the constituents described so far, and redundant description will be omitted.

FIG. 8 is a diagram showing an example of an embodiment of the present invention in which the shape and arrangement position of the covering member or the shape of the trough are changed. In FIG. 8, the width direction of the trough is the left-right direction of the figure. Further, the space below the groove formed in the trough serves as the transfer path.

In FIGS. 8A and 8B, a trough 305 having a 3/4 circular arc-shaped inner peripheral surface 3051 is provided with a covering member 385 having an upper half of an outer contour line having a pink cross section. An example of placement is shown.

The inner peripheral surface 3051 of the trough 305 shown in FIG. 8A and FIG. 8B has a curved portion 3051a at the upper end portion that is inserted toward the center side in the trough width direction. The curved portion 3051a acts as a brush against the sand that is going to be wound up along the inner peripheral surface 3051 of the trough 305, and is wound along the inner peripheral surface 3051 as shown by the arrow in FIG. The sand that is about to rise is returned to the transfer route.

Further, it can be said that the covering member 385 shown in FIGS. 8A and 8B has a cross-sectional shape of the upper half of the outline of the chestnut shape. This covering member 385 also has an inclined portion 3851 that is inclined downward in the width direction of the trough 305 (width direction of the transfer path). The inclined portion 3851 shown in FIGS. 8A and 8B is opened at an angle of 90 degrees, and the lower portion is formed of a curved surface. Here, the lower part thereof is formed by an arcuate curved surface having a radius of 150 mm. The upper end 385a of the cover member 385 is sharp, and the lower end 385b thereof is almost directly below, that is, faces the sand transport path, and the sand that has settled to the cover member 385 easily flows down to the sand transport path through the inclined portion 3851. .. Further, the covering member 385 extending in the predetermined direction also suppresses the winding up of sand that is about to be wound up in the extending direction (predetermined direction) of the trough 305 by the force of the water discharged from the discharge port.

In the cover member 385 shown in FIG. 8A, the height position of the lower end 385b coincides with the height position of the upper end 3052 of the trough 305. The distance W1 between the lower end 385b of the covering member 385 and the upper end 3052 of the trough 305 is a length equal to or longer than the predetermined interval in the filter screen 23 shown in FIG. 2, and is 100 mm here.

In the cover member 385 shown in FIG. 8B, the height position of the lower end 385b is lower than the height position of the upper end 3052 of the trough 305, and the height position of the upper end 385a is the height of the upper end 3052 of the trough 305. It is above the Sa position. That is, the lower end portion of the covering member 385 shown in FIG. 8B has entered the trough 305. The covering member 385 is separated from the upper end 3052 of the trough 305 by a distance W2 which is equal to or larger than the predetermined distance in the filter screen 23 shown in FIG. Further, the lower end 385b of the covering member 385 is also separated from the inner peripheral surface 3051 of the trough 305 by a distance W3 which is equal to or larger than the predetermined interval in the filter screen 23 shown in FIG. The distances W1 to W3 described above are all in the width direction of the trough.

In FIG. 8C, the trough 306 shown in FIGS. 8A and 8B has a narrowed bottom area, and the covering member 385 shown in FIGS. 8A and 8B. An example of arranging is shown.

The inner peripheral surface 3061 of the trough 306 shown in FIG. 8C also has a curved portion 3061a acting as a burrow at the upper end portion. Further, in the trough 306 shown in FIG. 8C, the area of the bottom portion of the trough is small, so the area of the bottom portion of the transfer path is also small, and the sand easily moves along the transfer path.

Further, in the cover member 385 shown in FIG. 8C, the height position of the lower end 385b is higher than the height position of the upper end 3062 of the trough 306. That is, the covering member 385 is disposed above the trough 306, and the lower end 385b of the covering member 385 is separated from the upper end 3062 of the trough 306 by a distance W4 which is equal to or more than the predetermined interval in the filter screen 23 shown in FIG. There is. The distance W4 mentioned here is the shortest distance connecting the lower end 385b of the covering member 385 and the upper end 3062 of the trough 306, and is 100 mm apart here.

FIG. 8D shows a trough 307 in which the U-shaped trough 3 shown in FIG. That is, the inner peripheral surface 3071 of the trough 307 shown in FIG. 8D has a curved portion 3071a that is curved with its outside convex, a flat portion 3071b that serves as an intermediate portion in the vertical direction, and a semi-cylindrical portion 3071c that serves as a bottom portion. Have. This curved portion 3071a also acts as a brush against the sand that is going to be wound up along the inner peripheral surface 3071 of the trough 307, and is wound along the inner peripheral surface 3071 as shown by the arrow in FIG. The sand that is about to rise is returned to the transfer route.

The cover member 38 shown in FIG. 8D is the same as the inverted V-shaped cover member 38 shown in FIG. 4A and the like, and is provided with a pair of flat plate-shaped inclined portions 380. The covering member 38 is disposed above the trough 307, and the widthwise interval L1 at the lower ends of the pair of inclined portions 380 is longer than the widthwise length L2 of the opening of the trough 307. Further, the lower end 38b of the covering member 38 is separated from the upper end 3072 of the trough 307 by a distance W5 which is equal to or more than the above-mentioned predetermined interval in the filter screen 23 shown in FIG. The distance W5 here is also the shortest distance like the distance W4, and is 80 mm apart here. The covering member 38 extending in the predetermined direction also suppresses the sand that is about to be wound up in the extending direction (predetermined direction) of the trough 307 due to the force of the water discharged from the discharge port.

In the examples described so far, the widthwise interval at the lower ends of the pair of inclined portions of the covering member was shorter than the widthwise length of the opening of the trough, but the covering member is more than the predetermined distance above the trough. If located above, the spacing may be the same as the widthwise length of the opening in the trough.

As described above, in any of the examples described with reference to FIG. 8, since the distances W1 to 5 are equal to or more than the predetermined interval, the sand that has flowed down along the inclined surface 6 shown in FIG. It is also possible to prevent clogging between the support members (not shown here) 37 (see FIG. 1).

In addition to this, the trough may be formed in a semi-circular shape, may be in a rectangular shape with an upper opening, or may be in a semi-oval tube shape in which the radius of curvature decreases toward the lower side. Good. In the case of the semi-oval tube shape, even if a heavy object such as a stone is settled at the bottom of the tube, the heavy object is easily moved by the flow of water.

Further, the covering member may have a semicircular cross-sectional shape, or may have a shape formed by connecting arc-shaped curves. Further, although all the inclined portions of the covering member shown in FIG. 8 are opened at an angle of 90 degrees, they may be at a predetermined angle belonging to a range of 30 degrees or more and 90 degrees or less.

FIG. 9A is a diagram showing a modification of the example shown in FIG. 8D.

9(a) shows the same trough 307 as the trough shown in FIG. 8(d). Further, FIG. 9A also shows the inclined surfaces 6 provided on both sides in the width direction of the trough 307. This inclined surface 6 is inclined downward by θ1 (here, 45 degrees) toward the trough 307. As shown in FIG. 9A, the opening 307a of the trough 307 is narrowed.

The cover member 386 shown in FIG. 9A is an inverted V-shaped cover member, but the opening angle (θ2) of the inclined portion 3861 is 60 degrees. The cover member 386 is also disposed above the trough 307, and the interval L1 in the trough width direction at the lower ends 386b of the pair of inclined portions 3861 is longer than the length L2 in the trough width direction of the opening of the trough 307. The opening 307a of the trough 307 is long, and is completely covered in the width direction by the cover member 386 with a space in the vertical direction. Further, the lower end 386b of the covering member 386 is separated from the inclined surface 6 by a distance W6 which is equal to or more than the above-mentioned predetermined interval in the filter screen 23 shown in FIG. The distance W6 mentioned here is the shortest distance connecting the lower end 386b of the covering member 386 and the inclined surface 6, and is 100 mm apart here. Note that the lower end 386b of the covering member 386 may be installed in the trough width direction with a distance W7 that is equal to or more than the above-mentioned predetermined interval with respect to the inclined surface 6.

In the modification shown in FIG. 9(a), the sand slides on the inclined surface 6 to drop from the opening 307a of the trough 307 to the transfer path, and the dropped sand is transferred to the inner peripheral surface 3071 by the force of the water discharged from the discharge port. Even if it is likely to wind up along the sand, the curved portion 3071a of the trough 307 acts as a burrow, and as shown by the arrow in the figure (a), the sand that tries to wind up along the inner peripheral surface 3071 is transferred. Returned to the route. Further, the covering member 386 extending in the predetermined direction also suppresses the winding up of sand that is about to be wound up in the extending direction (predetermined direction) of the trough 307 by the force of the water discharged from the discharge port.

FIG. 9B is a diagram showing a modification of the example shown in FIG. 8C.

9(b) shows the same trough 306 as the trough shown in FIG. 8(e). Further, the cover member 387 shown in FIG. 9B has the same shape as the cover member 385 shown in FIG. 8C. The cover member 387 completely covers the opening 306a of the trough 306 in the width direction at intervals in the vertical direction. The lower end 387b of the covering member 387 shown in FIG. 9B is separated from the upper end 3062 of the trough 306 by a distance W8 which is equal to or more than the above-mentioned predetermined interval in the filter screen 23 shown in FIG. The distance W8 mentioned here is the shortest distance connecting the lower end 387b of the covering member 387 and the upper end 3062 of the trough 306, and is 100 mm apart here.

The sand that is about to wind up along the inner peripheral surface 3061 due to the momentum of the water discharged from the discharge port is assumed to have once jumped out of the opening 306a of the trough 306 as shown by the curved arrow in FIG. 9B. Also, it is reversed in the covering member 387 and returns to the transfer path. Further, the covering member 387 extending in the predetermined direction also suppresses the winding up of sand that is about to be wound up in the extending direction (predetermined direction) of the trough 306 due to the force of the water discharged from the discharge port.

In the example shown in FIG. 9 described above, the trough widthwise interval at the lower end of the cover member is longer than the widthwise length of the opening of the trough (groove), but the interval may be the same. .. That is, the interval in the trough width direction at the lower end of the covering member may be equal to or more than the width direction length of the trough (groove) opening.

FIG. 10 is a partial cross-sectional view showing a modified example of the discharge nozzle 7.

In this modification, a discharge pipe 79 that protrudes toward the groove G side from the step portion 303 is provided at the tip of the discharge nozzle 7. A discharge port 74 for discharging water is provided at the downstream end of the discharge pipe 79. In this modification, the outer shape portion of the discharge pipe 79 protruding into the groove G becomes a part of the groove forming wall 30. It should be noted that this modified example has a drawback in that if the sand accumulates just below the portion of the discharge pipe 79 protruding into the groove G, it will be difficult to move the sand.

Further, in the above-described embodiment, an example in which one discharge port 71, 72, 73 is provided at each predetermined position (5 m interval) in the extending direction of the groove G has been described, but the extending direction of the groove G is described. A plurality of ejection ports may be provided at each predetermined position in. When a plurality of discharge ports are provided at each predetermined position, the total amount of water discharged from the plurality of discharge ports provided at each predetermined position is 2000 liters per minute. Further, in the present embodiment, an example in which only one trough 3 is provided has been described, but a plurality of troughs 3 may be provided in parallel.

The water discharged from each of the discharge ports 71, 72, 73 is preferably 1000 liters or more and 3000 liters or less per minute, and need not be 2000 liters per minute. If it is less than 1000 liters per minute, the sand deposited in the groove G may hardly move. If it is more than 3000 liters per minute, it cannot be said that there is no danger that sand will come out from between the support members 39 and 39 between the support members 39. Is preferably kept at 3000 liters per minute or less. To explain this in more detail, in the present embodiment, it is premised that controlling the discharge flow rate from each discharge port is the most effective in order to move the accumulated sand efficiently by a predetermined distance. Assuming that the discharge flow rate is 16 m/sec, if the discharge flow rate is reduced to 800 liters per minute, not only the sand will not move for a predetermined distance, but also the discharge port and the pipe connected to the discharge port will have a small diameter, and the sand will be collected. When sewage is used as water, there is a risk of clogging with dust. Further, since the sand does not move for a predetermined distance, a large number of discharge ports are required in the moving direction of the sand, and the number of pipes to the discharge ports also increases, which is uneconomical because of a large number of devices. On the other hand, if the discharge flow rate is also set to 16 m/sec, and if the discharge flow rate is increased to 3200 liters per minute, there is no fear that sand will come out from the space 37 between the support members 39 and 39. It cannot be cut.

Further, three pumps P may be provided, each pump P may be connected to each of the discharge ports 71, 72, 73, and water may be supplied from each pump P at the same time. The sand moving time can be shortened by simultaneously supplying the water from each pump P. As shown in FIG. 8, the amount of water discharged from each discharge port is preferably in the range of 1000 liters per minute to 3000 liters per minute, and the larger the amount, the greater the movement distance of sand. it can. However, when rehabilitating an existing sand basin and installing a discharge port, the amount of water discharged from the discharge port at the same time should be less than the pumping amount of the pumping pump 51 so that the water level in the sand basin does not rise. It is preferable. In other words, it is preferable that the pump includes a pump for pumping the total amount of water discharged from the discharge port per unit time.

Next, another embodiment will be described. Also in the following description, differences from the sand basin 1 described above will be mainly described. Further, the same components as those described so far are designated by the same reference numerals as those used so far, and the duplicated description will be omitted.

FIG. 11 is a cross-sectional view of the sand basin 10 of the second embodiment, taken along the center in the width direction. Also in FIG. 11, the right side of the figure is the upstream side and the left side is the downstream side.

The sand basin 10 of the second embodiment is different from the sand basin 1 of the previous embodiment in the position where the sand collecting pit 4 is provided. This sand basin 10 has an upstream trough 8 on the upstream side of the sand collecting pit 4 and a downstream trough 9 on the downstream side of the sand collecting pit 4. Further, unlike the previous embodiment, the upstream trough 8 and the downstream trough 9 have no connecting member and are formed by a single U-shaped member. Each of the upstream side trough 8 and the downstream side trough 9 is a stainless steel plate material having a plate thickness of 4 mm and formed into a U-shaped cross section. In the second embodiment, the upstream trough 8 has a length of 7 m in the longitudinal direction, and the downstream trough 9 has a length of 8 m in the longitudinal direction.

Although the same dust remover 2 as the dust remover 2 shown in FIG. 2 is installed further upstream than the upstream trough 8, it is omitted in FIG.

Further, above each of the upstream side trough 8 and the downstream side trough 9, there is provided a covering member 38 having an inverted V-shaped cross section similar to the covering member 38 shown in FIG.

The end of the upstream trough 8 opposite to the sand collecting pit 4 and the end of the downstream trough 9 opposite to the sand collecting pit 4 are shown in FIG. The structure is the same as that shown in FIG. 6B, the upstream discharge port 81 (see FIG. 12) is provided on the downstream side surface of the end face wall attached to the upstream trough 8, and the downstream trough 9 is provided. A downstream discharge port 91 (see FIG. 12) is provided on the upstream side surface of the end wall attached to the. In the second embodiment, the upstream groove forming wall 80 is formed by the inner peripheral surface of the upstream trough 8 and the downstream side surface of the end surface wall attached to the upstream trough 8. The upstream groove G is formed by the upstream groove forming wall 80. The most downstream end of the upstream groove G is connected to the sand collecting pit 4. A downstream groove forming wall 90 is formed by the inner peripheral surface of the downstream trough 9 and the upstream side surface of the end surface wall attached to the downstream trough 9. The downstream groove G is formed by the downstream groove forming wall 90. The most upstream end of the downstream groove G is connected to the sand collecting pit 4. When water is discharged from the upstream discharge port 81 (see FIG. 12), the inside of the upstream trough 8 serves as a transfer path, and when water is discharged from the downstream discharge port 91 (see FIG. 12), the downstream trough 8 The inside of 9 becomes a transfer route.

FIG. 12 is a block diagram of water supply equipment provided in the sand basin 10 shown in FIG.

The sand basin 10 is provided with a water supply pump P. The water supply pump P is a pump that supplies 2000 liters of water per minute. A branch pipe 27 is provided between each water supply pipe 25, 26 connected to each discharge port 81, 91 and the water supply pump P. Further, the water supply pipes 25 and 26 are provided with electric valves V4 and V5, respectively.

In the sand basin 10 shown in FIG. 11, the water supply pump P is driven and the electric valve V4 is first opened. At this time, the electric valve V5 is closed. The water of 2000 liters per minute supplied by the water supply pump P is discharged from the upstream discharge port 81 via the branch pipe 27 and the water supply pipe 25. By continuing this discharge for 5 minutes, the sand in the groove G on the upstream side moves to the sand collecting pit 4. Next, the electric valve V4 is closed and the electric valve V5 is opened. As a result, 2000 liters per minute of water supplied by the water supply pump P is discharged from the downstream discharge port 91. By continuing this discharge for 5 minutes, the sand in the groove G on the downstream side moves to the sand collecting pit 4. In this way, the sand moves to the sand collecting pit 4 through the transfer route in the upstream trough 8 and the transfer route in the downstream trough 9, respectively. When the sand moves along the transfer route, the sand is likely to wind up due to the momentum of the discharged water, but the lifted sand hits the covering member 38 and does not move upward anymore and is settled in the groove G. .. Further, the covering member 38 does not block the water discharged from the upstream discharge port 81 and the downstream discharge port 91. Further, the cover member 38 is not arranged so as to face the discharge direction of water from the upstream discharge port 81 and the downstream discharge port 91, and sand is unlikely to wind up along the cover member 38. Finally, the water supply pump P is stopped, the motor-operated valve V5 is closed, the sand pump 41 is driven, and the sand moved to the sand collecting pit 4 is conveyed to the outside of the sand basin 1. The above operation is repeated every predetermined time.

As described above, also in the sand basin 10 of the second embodiment, it is possible to suppress the curling of the sand by the covering member 38 while sufficiently moving the sand. Further, the upstream discharge port 81 is arranged at the upstream end of the upstream groove formation wall 80, and the downstream discharge port 91 is arranged at the downstream end of the downstream groove formation wall 90, and each minute from each discharge port. Since 2000 liters of water are discharged toward the upstream side groove G and the downstream side groove G, the sand accumulated in the groove can be efficiently moved by a predetermined distance. Further, in the sand basin 10, the groove G is provided on the upstream side of the sand collecting pit 4 and on the downstream side of the sand collecting pit 4, so that the length of the groove G in the extending direction is shortened. By shortening the length of the groove G in the extending direction, the discharge port can be omitted in the middle of the groove G, and the structures of the upstream trough 8 and the downstream trough 9 can be simplified.

In addition, if the sand basin explained above is put together, in the sand basin where the sand contained in the received water sinks, a groove forming wall that forms a groove in the bottom of the basin and forms a groove in which the settled sand accumulates; A sand collecting pit that is provided at the bottom and is connected to the groove, and a discharge port that is arranged on the groove forming wall and that discharges fluid into the groove from a predetermined position in the extending direction of the groove. It can also be said that the discharge port unit is a sand basin characterized by discharging a fluid of 1000 liters or more and 3000 liters or less per minute. According to this sand basin, since the fluid of 1000 liters to 3000 liters per minute is discharged from the discharge port unit, the accumulated sand can be efficiently moved by a predetermined distance.

Here, when the discharge unit includes a plurality of discharge ports, the total amount of discharge from the plurality of discharge ports per unit time is 1000 liters or more and 3000 liters or less per minute.

In addition, a plurality of the projecting opening units may be arranged on the groove forming wall at intervals in the extending direction of the groove.

In addition, it is preferable that the pond bottom portion has a bottom surface continuous with the groove, and the bottom surface is inclined downward toward the groove. Since the bottom surface is inclined toward the groove, the sedimented sand can be collected in the groove.

Further, the groove forming wall has an extending portion extending toward the sand collecting pit at a wall bottom portion, and the discharge port discharges a fluid along the extending portion. It is preferable. This allows the sand to move efficiently along the groove.

Furthermore, the groove forming wall has a staircase-shaped wall bottom portion that gradually becomes deeper toward the sand collecting pit, and the discharge port unit connects an upper step portion and a lower step portion in the staircase-shaped wall bottom portion. It is also preferable that it is arranged at the step portion. By arranging the discharge port unit at the step, the discharge port unit does not hinder the movement of sand.

Furthermore, at least a part of the groove forming wall is formed of an inner peripheral surface of a plate-shaped member, and a part of an outer peripheral surface of the plate-shaped member is formed as a part of an inner wall connected to the discharge port unit. It is also one of the preferable embodiments to have the discharge nozzle described above. According to this aspect, the structure of the discharge nozzle can be simplified and the vertical thickness of the discharge nozzle can be suppressed.

Further, the sand collecting method of the sand basin described so far is a sand collecting method for collecting the sand in the sand basin in which the sand contained in the received water is settled, and the sand is provided at the bottom of the basin. And a fluid is discharged into the groove from a predetermined position in the extending direction of the groove, and the sand settled in the groove is moved toward the sand collecting pit connected to the groove by the flow of the fluid. And a sand collecting step, wherein the sand collecting step is a step of discharging a fluid of 1000 liters or more and 3000 liters or less per minute.

FIG. 13 is a schematic view of the sand basin 100 of the third embodiment as viewed from the sand collecting pit side. In FIG. 13, the back side of the paper is the upstream side and the front side of the paper is the downstream side. The left-right direction of FIG. 11 is the pond width direction.

The sand basin 100 of the third embodiment is a so-called high-pressure sand basin in which the discharge pressure of water discharged from the discharge port 101 is 0.59 MPa or more. In FIG. 13, four discharge ports 101 are shown, and a discharge axis L extending from the center of each discharge port 101 in a predetermined direction in which a sand collecting pit (not shown) is provided is also shown. The discharge axis L is an axis (extension line) extending in the direction perpendicular to the paper surface. Further, this sand basin 100 is not provided with a trough in a groove shape, and the basin 100a is a flat surface. The sand transfer path 103 is a plane portion along the discharge axis L in the pond bottom portion 100a. In FIG. 13, the extension direction of the transfer path 103 is also perpendicular to the paper surface, and the width direction is the left-right direction of the drawing as is the pond width direction. Further, the sand basin 100 shown in FIG. 13 is also provided with a cover member 38 having a reverse V-shaped cross section similar to the cover member 38 shown in FIG. The covering member 38 shown in FIG. 13 also covers a portion of the transfer path 103 on the discharge axis L with an interval from the upper side in the vertical direction, and is an inclined portion that is inclined downward in the width direction of the transfer path 103. Have 380.

When high-pressure water is discharged from the discharge port 101 in a state where sand is accumulated on the pond bottom 100a, the sand moves to the sand collecting pit (not shown) through the transfer path 103. At this time, since the water is of high pressure, the sand is likely to wind up due to the force of the discharged water, but the floating sand hits the covering member 38 and does not go upward any further. The covering member 38 shown in FIG. 13 also does not block the water discharged from the discharge port 101, is not arranged so as to face the discharge direction of the water from the discharge port 101, and is covered with sand. It is hard to roll up along 38. As described above, also in the sand basin 100 for carrying out the high-pressure sand collection of the third embodiment, it is possible to suppress the rolling up of the sand by the covering member 38 while sufficiently moving the sand.

The sand basin that I have explained so far is
In a sand basin where the sand contained in the received water sinks,
A transfer route that is provided at the bottom of the pond, extends in a predetermined direction, and deposits the sedimented sand,
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member for covering an axial portion of the transfer path extending from the center of the discharge port in the predetermined direction from above,
A dust remover disposed on the water receiving port side of the transfer path and blocking passage of a contaminant having a predetermined length or more among contaminants mixed in the received water,
The cover member has an inclined portion that is inclined downward in the width direction of the transfer path,
The transfer path is formed by a groove forming wall and has a groove shape having an opening at the upper end,
The covering member may be separated from the upper end of the groove forming wall by the predetermined length or more.

In the sand setting site, the lower part of the cover member may be formed into an arcuate curved surface.

In addition, in the sand basin where the sand contained in the received water sinks,
A transfer route that is provided at the bottom of the pond, extends in a predetermined direction, and deposits the sedimented sand,
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member for covering, from above, an axial portion of the transfer path extending from the center of the discharge port toward the predetermined direction,
The cover member has an inclined portion that is inclined downward in the width direction of the transfer path,
The transfer path is formed by a groove forming wall and has a groove shape having an opening at the upper end,
The groove forming wall may be characterized in that it has a curved portion at the upper end portion that extends toward the center side in the width direction.

Furthermore, in the sand basin where the sand contained in the received water sinks,
A transfer route that is provided at the bottom of the pond, extends in a predetermined direction, and deposits the sedimented sand,
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member for covering, from above, an axial portion of the transfer path extending from the center of the discharge port toward the predetermined direction,
The cover member may have an inclined portion that is inclined downward in the width direction of the transfer path.

According to the above sand basin, the inclined portion is inclined in the width direction and therefore does not block the fluid discharged from the discharge port. In addition, the inclined portion is not arranged so as to face the discharge direction of the fluid from the discharge port, and it is difficult for sand to wind up along the inclined portion.

Here, it is preferable that the cover member covers the portion from above at a vertical interval.

The inclined portion may have a flat plate shape or a curved surface shape. Further, when the inclined portion has a curved shape, it is preferable that the inclined portion has a curved shape with a convex upper portion.

The discharge shaft extends over the entire length of the transfer path, and the covering member covers a part or the whole of the discharge shaft from above. The cover member is provided along the transfer path.

The transfer path may be flat. Further, the transfer path may be a groove formed by a groove forming wall and having an opening at the upper end. It should be noted that the entire space defined by the groove forming wall may not be the transfer path, but a part of the lower side of the space may be the transfer path. Further, the lower end of the inclined portion may be located above the upper edge of the groove forming wall, or may be located at the same height as the upper edge. Alternatively, the lower end of the inclined portion may be located below the upper edge, and in this case, a part of the inclined portion enters the space defined by the groove forming wall. Will be out.

Further, it may be an aspect provided with a sand collecting pit provided at the bottom of the pond and connected to the transfer path.

Further, the covering member may have an inverted V-shape whose cross-sectional shape is upside down, or may have a shape of the upper half of the outer line of a peach or chestnut shape. It may have a shape formed by connecting arc-shaped curves.

Further, in the sand basin, the transfer route is a mode in which the widthwise central portion is covered by the covering member, and the widthwise both end portions are open, and for example, the transfer route has the widthwise both end portions. It may be open upwards.

According to this aspect, the center of the discharge port is located in the central portion in the width direction, and the settling sand enters the transfer path from both ends in the width direction that are open upward, and accumulates in the transfer path.

In the sand basin, the transfer path is formed by a groove forming wall and has a groove shape having an opening at an upper end,
It is preferable that the groove forming wall has an upper end portion having a curved portion that is recessed toward the center side in the width direction.

That is, the curved portion is curved with the outside of the groove-shaped transfer path being convex, and acts as a brush against sand that is going to be rolled up along the groove forming wall, and along the groove forming wall. The sand to be hoisted is returned to the transfer path.

Further, in the sand basin, it is preferable that the cover member has a sharp upper end.

Since the upper end is sharp, it is difficult for sand to accumulate on the cover member, and the sand that has settled on the cover member easily flows down the transfer path through the inclined portion.

Furthermore, in the sand basin, provided with a dust remover that is arranged on the water receiving side of the transfer route and blocks passage of contaminants having a predetermined length or more among contaminants mixed in the received water,
The transfer path is a groove formed by a groove forming wall and having an opening at an upper end,
It is preferable that the cover member is separated from the upper end of the groove forming wall by the predetermined length or more.

By doing so, it becomes easier for the settled sand to enter the open portion through the transfer path, and it is also possible to prevent the open portion from being clogged.

The cover member may have a lower end portion separated from the upper end portion of the groove forming wall by the predetermined length or more. Alternatively, both end portions in the width direction of the transfer path may be opened by the predetermined length or more when viewed in the width direction.

In addition, the sand basin that I have explained so far is
In a transfer device that transfers the sedimented and deposited sand contained in the received water,
A transfer path constituent member that extends in a predetermined direction and forms a transfer path on which sedimented sand is deposited;
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member that covers, from above, an axial portion of the transfer path extending from the center of the discharge port toward the predetermined direction,
The transfer path constituent member has an upper portion having a curved portion that enters the center side in the width direction of the transfer path,
A gap is always provided between the lower end on the one side in the width direction of the cover member and the curved portion on the one side, and the lower end on the other side in the width direction of the cover member and the curved portion on the other side. There is always a gap between them,
The curved portion may be positioned above the lower end of the cover member.

Also, the transfer device described so far is
In a transfer device that transfers the sedimented and deposited sand contained in the received water,
A transfer path constituent member that extends in a predetermined direction and forms a transfer path on which sedimented sand is deposited;
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member for covering, from above, an axial portion of the transfer path extending from the center of the discharge port toward the predetermined direction,
The transfer path constituting member has a lower curved portion that is recessed downward toward the center side in the width direction of the transfer path in the lower portion,
A gap is always provided in the width direction between the lower end of the cover member on the one side in the width direction and the one side of the transfer path forming member, and the lower end of the cover member on the other side in the width direction is formed. It may be characterized in that a gap is always provided in the width direction between the transfer path forming member and the other side.

Also, the transfer device described so far is
In a transfer device that transfers the sedimented and deposited sand contained in the received water,
A transfer path constituent member that extends in a predetermined direction and forms a transfer path on which sedimented sand is deposited;
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member that covers, from above, an axial portion of the transfer path extending from the center of the discharge port toward the predetermined direction,
The transfer path forming member has a lower curved portion that is recessed downward toward a widthwise center of the transfer path in a lower portion, and an upper bend that enters the widthwise center of the upper portion. Parts,
The covering member has a pair of lower ends spaced apart in the width direction and a curved surface portion connected to the lower ends,
The pair of lower ends is one that has entered the transfer path,
The curved surface portion on the one side in the width direction of the covering member is opposed to the one side upper curved portion of the transfer path forming member with a gap,
The curved surface portion on the other side in the width direction of the covering member is opposed to the upper side curved portion on the other side of the transfer path constituting member with a gap,
A gap is always provided in the width direction between the lower end of the cover member on the one side in the width direction and the one side of the transfer path forming member, and the lower end of the cover member on the other side in the width direction is formed. A gap is always provided in the width direction between the transfer path forming member and the other side.

Further, in this transfer device, the cover member may have inclined portions that are inclined downward on both sides in the width direction of the transfer path toward the outside in the width direction.

1 sand set basin 3,305,306,307 trough 30 groove forming wall 3051a, 3061a, 3071a curved part 3052,3062,3072 upper end 4 sand collecting pit 6 pond bottom 7 discharge nozzle 37 interval 38,385 cover member 380,3851 inclined part 38a, 385a Upper end 38b, 385b Lower end 39 Support member G groove L Discharge shaft

Claims (2)

In a transfer device that transfers the sedimented and deposited sand contained in the received water,
A transfer path constituent member that extends in a predetermined direction and forms a transfer path on which sedimented sand is deposited;
A discharge port for discharging the fluid in the predetermined direction with respect to the sand accumulated in the transfer path,
A cover member for covering, from above, an axial portion of the transfer path extending from the center of the discharge port toward the predetermined direction,
The transfer device is arranged in a position apart from an inner peripheral surface of the transfer path forming member, and has a horizontally long shape in which a height direction is collapsed and a width direction is expanded. The transfer device according to claim 1, wherein both ends of the discharge port in the width direction are positioned inside both ends of the cover member in the width direction.

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