JP6755455B2 - Solid-liquid separation system - Google Patents

Description

The present invention relates to a solid-liquid separation system in which contaminants contained in a received liquid are settled at the bottom, the precipitated contaminants are transferred to an accumulation portion, and the contaminants are removed from the accumulation portion.

Whether it is a sand basin or a sedimentation basin installed in a sewage treatment facility, it is one of the solid-liquid separation systems that separates the solids contained in the liquid from the liquid. The sand basin receives sewage such as sewage or rainwater, sediments the sand contained in the sewage to the bottom of the pond, transfers the sedimented sand to the sand collection pit, and lifts the sand collected in the sand collection pit. It is removed by a pump. In addition, the settling basin receives water from which sand has been removed from the sand basin, settles the sludge contained in the received water to the bottom of the pond, transfers the settled sludge to the sludge pit, and collects it in the sludge pit. Sludge is removed by a sludge pump. Furthermore, various solid-liquid separation systems are used in places other than sewage treatment facilities. For example, metal powder contained in factory effluent is transferred to a predetermined accumulation part, and the collected metal powder is removed by a pump or the like. It is also conceivable that the sediment or the like that has flowed into a reservoir such as a dam lake is transferred to a predetermined accumulation part and the collected sediment or the like is removed by a pump or the like. Hereinafter, solids separated from liquids by a solid-liquid separation system, such as sand and sludge contained in sewage, metal powder contained in industrial wastewater, and earth and sand flowing into a reservoir together with water, may be referred to as contaminants. is there.

In these solid-liquid separation systems, a discharge port for discharging a fluid toward the downstream side in the transfer direction of the contaminant is provided, and the contaminant is transferred by discharging the fluid from the discharge port toward the accumulated contaminant. Are known. In the mode in which the fluid is discharged toward the deposited contaminants, the deposited contaminants may be rolled up by the discharged fluid. On the other hand, if the amount of fluid discharged from the discharge port is reduced in order to suppress the winding up of the contaminants, this time, the contaminants may not be sufficiently transferred, and the winding up of the contaminants should be suppressed. It is difficult to achieve both the and sufficient transfer of contaminants. Therefore, a solid-liquid separation system has been proposed in which the contaminants are sufficiently transferred while suppressing the winding of the contaminants (see, for example, Patent Document 1 and the like).

The solid-liquid separation system described in Patent Document 1 has a groove extending upward toward an accumulation portion such as a sand basin pit and a groove defining surface defining the groove at the bottom such as a pond bottom. On the other hand, it is provided with a space forming member having a gap and arranged along the groove, and a discharge port for discharging a fluid. The space-forming member is, for example, a member obtained by cutting out a lower portion of a cylindrical body, forms a space in which an upper end portion is closed, and has a suction port opened downward at the lower end. This suction port is separated from the bottom of the groove. The discharge port has, for example, a flat shape whose height direction is crushed and widens in the width direction, and a fluid is discharged from this discharge port toward the downstream side in the transfer direction of the contaminant. In the solid-liquid separation system described in Patent Document 1, contaminants such as sand contained in sewage and the like enter the gap between the groove defining surface and the space forming member and accumulate at the bottom of the groove. Therefore, when the fluid is discharged from the discharge port into the space of the space forming member, a pressure difference is generated between the inside and the outside of the space forming member, and the contaminants accumulated at the bottom of the groove are sucked into the space from the suction port. Further, in the space, the sucked contaminants move to the downstream side in the transfer direction by the flow of the fluid and are transferred to the accumulation part. The contaminants moving in the space are less likely to come out of the space forming member in the portion where the pressure difference is generated, and the winding of the contaminants is suppressed. Therefore, it is possible to suppress the roll-up of sand while sufficiently transferring the contaminants. The contaminants transferred to the accumulation part are removed from the accumulation part by a removing means such as a pump.

Japanese Unexamined Patent Publication No. 2014-24055

By the way, in the solid-liquid separation system described in Patent Document 1, the end on the integrated portion side in the groove, the end on the integrated portion side in the space forming member, and the inlet end on the groove side in the integrated portion coincide with each other. The fluid discharged from the outlet diffuses into the space of the integrated portion immediately after reaching the integrated portion. For this reason, in the portion near the integrated portion of the space forming member, the pressure difference between the inside and the outside of the space forming member becomes small, the suction force decreases, and the mixture moves in the space of the space forming member toward the integrated portion. It has become clear that some of the objects may come out from the suction port into the groove before reaching the accumulation part, and the contaminants may not reach the accumulation part.

In view of the above circumstances, an object of the present invention is to provide a solid-liquid separation system capable of transferring a larger amount of contaminants to the accumulation part.

The solid-liquid separation system of the present invention that solves the above object causes the contaminants contained in the received liquid to settle to the bottom, transfers the precipitated contaminants to the accumulation portion, and removes the contaminants from the accumulation portion. A solid-liquid separation system that removes
A groove extending upward toward the accumulating portion at the bottom and opening upward.
A space-forming member provided along the groove, forming a space in which the upper end portion is closed, and a suction port provided below the upper end portion and separated from the bottom portion of the groove.
It is provided with a discharge port for discharging the fluid in the space toward the downstream side in the transfer direction of the contaminant.
The discharge port discharges a fluid at a discharge pressure of 0.05 MPa or more and 0.3 MPa or less, and has a flat shape in which the opening length in the width direction is longer than the opening length in the width direction of the suction port. It is characterized by being.

According to the solid-liquid separation system of the present invention, it is possible to provide a solid-liquid separation system capable of transferring a larger amount of contaminants to the accumulation part.

It is a top view of the sand basin corresponding to one embodiment of the present invention. It is a cross-sectional view of AA of the sand basin shown in FIG. (A) is a sectional view taken along the line BB of the sand basin shown in FIG. 2, and FIG. 2B is a sectional view taken along the line CC of (a). (A) is a plan view of the discharge member, and (b) is a side view of the discharge member shown in (a) as viewed from below. (A) is a front view (viewed from the downstream side) of the auxiliary trough, and (b) is a side view of the auxiliary trough shown in (a) seen from the left side. (A) is a front view (viewed from the downstream side) of the auxiliary space forming member, and (b) is a side view of the auxiliary space forming member shown in (a) seen from the left side. It is a DD sectional view of the sand basin shown in FIG. (A) is an EE cross-sectional view of the sand basin shown in FIG. 2, and (b) is an enlarged cross-sectional view showing an enlarged portion F surrounded by a circle in the sand basin shown in FIG. (A) is an enlarged view showing the sand collecting pit of the sand basin shown in FIG. 1 and the G portion surrounding the sand collecting pit and the peripheral portion thereof, and FIG. , (C) is a cross-sectional view taken along the line II of (a), and (d) is a perspective view of the cap member shown in (a) viewed from diagonally above left on the upstream side. It is a figure which shows the deformation example of a partition member. It is a figure which shows the modification of the space forming member shown in FIG. 8B. (A) and (b) are diagrams showing how the first modification of the cap member shown in FIG. 9 corresponds to FIGS. 9 (c) and 9 (d). It is a figure which shows the state corresponding to FIG. 9 about the 2nd modification of the cap member shown in FIG. 9 and the modification of the 2nd support plate shown in FIG. In the cap member of the second modified example shown in FIG. 13 and the second support plate of the modified example, the mode in which the cap member of the second modified example is used as the third modified example corresponds to FIGS. 13 (a) to 13 (c). It is a figure which shows the state of this. (A) is a cross-sectional view in the width direction in a mode in which a plurality of troughs and a plurality of space forming members are connected in the transfer direction and a plurality of discharge members are provided in the transfer direction, and (b) is N in (a). −N sectional view. It is a figure which shows the modification of the discharge port which changed the shape and position with respect to the discharge port shown in FIG. 3A and FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The solid-liquid separation device of the present invention is a device for removing metal powder or the like contained in a sand basin or a settling basin in a sewage treatment facility, or in a factory effluent, or is installed in a reservoir such as a dam lake and has flowed in. Can be adopted as a device for removing. In the present embodiment, an example in which the present invention is adopted for a sand basin will be described. This sand basin is located on the upstream side of the sewage treatment facility, and after sedimenting the sand contained in sewage such as sewage or rainwater, the sedimented sand is moved to a sand collection pit and removed from the sewage.

FIG. 1 is a plan view of a sand basin 1 corresponding to an embodiment of the present invention as viewed from above, and FIG. 2 is a sectional view taken along the line AA of the sand basin 1 shown in FIG.

As shown in FIG. 1, the sand basin 1 is a rectangular pond in a plan view provided with a dust remover 2, a trough 3, and a sand collecting pit 42. Hereinafter, the long side direction of the sand basin 1 may be referred to as a longitudinal direction, and the short side direction may be referred to as a width direction. The sand basin 1 shown in FIG. 1 receives sewage from the left side of the figure, and the received water slowly flows toward the right side of the figure (see the arrows shown in FIGS. 1 and 2). That is, the longitudinal direction of the sand basin 1 is the direction of water flow, and in FIGS. 1 and 2, the left side of the figure is the upstream side and the right side is the downstream side.

The dust remover 2 is for removing stone blocks, slags, and the like having a predetermined size or larger among the contaminants mixed in the sewage flowing into the sand basin 1, and is used for trough 3 and sand collection pits. It is installed on the upstream side of 42. The dust remover 2 has an endless chain 21, a plurality of rakes 22 attached to the endless chain 21 at intervals, and a filtration screen 23 submerged in water. The endless chain 21 is provided so as to stand diagonally on both sides of the sand basin 1 in the width direction, and is wound around the ground side sprocket 211 and the pond bottom side sprocket 212 as shown in FIG. There is. When the endless chain 21 is driven, the rake 22 goes in and out of the water. The filtration screen 23 is arranged on the downstream side of the endless chain 21. In the filtration screen 23, bars extending in the vertical direction are arranged at predetermined intervals (for example, 25 mm to 75 mm) to block the passage of contaminants having a size equal to or larger than the predetermined intervals. In this embodiment, bars extending in the vertical direction are arranged at intervals of 75 mm. The contaminants blocked by the filtration screen 23 are scraped up by the rake 22, and the contaminants that are scraped up are placed on a transportation means such as a belt conveyor (not shown) on the ground side.

On the downstream side of the dust remover 2, an upstream side pond bottom portion 10a, a sand collecting pit 42, and a downstream side pond bottom portion 10b are provided in the order described from the upstream side to the downstream side. Hereinafter, when it is not necessary to distinguish between the upstream side pond bottom portion 10a and the downstream side pond bottom portion 10b, they may be collectively referred to as the pond bottom portion 10. The WL shown in FIG. 2 represents the water surface of sewage. The position of the water surface WL changes depending on the amount of sewage flowing into the sand basin 1 in a range where the height from the bottom 10 is, for example, 1 m or more and 5 m or less. The sand in the sewage that has flowed into the sand basin 1 settles in the pond bottom 10 and the sand collection pit 42, and the sand that has settled in the pond bottom 10 is settled in the sand collection pit by the water discharged from the discharge port 7a, as will be described later. Transferred to 42. As a result, the sand in the sewage that has flowed into the sand basin 1 is collected in the sand collection pit 42. That is, the direction from the discharge port 7a to the sand collecting pit 42 corresponds to the transfer direction, and in the sand basin 1 shown in FIGS. 1 and 2, the right direction is the transfer direction at the upstream pond bottom 10a, and the downstream pond At the bottom 10b, the left direction is the transfer direction. Further, the pond bottom 10 corresponds to an example of the bottom, the sand collecting pit 42 corresponds to an example of the accumulation part, and the sand in the sewage flowing into the sand basin 1 is a contaminant contained in the received liquid. Corresponds to one example.

The bottom of the pond 10 is provided with inclined surfaces 41 and 41 inclined downward from both sides in the width direction toward the center in the width direction, and a trough 3 is provided so as to connect to the inclined surfaces 41 and 41. In the present embodiment, the inclined surface 41 is formed by placing concrete. The trough 3 corresponds to a groove extending upward toward the sand collecting pit 42 at the bottom of the pond 10. Discharge members 7 having discharge ports 7a, which will be described in detail later, are provided on the upstream side of the trough 3 provided on the upstream pond bottom 10a and on the downstream side of the trough 3 provided on the downstream pond bottom 10b. ing. Further, each of the downstream side of the trough 3 provided on the upstream pond bottom 10a and the upstream side of the trough 3 provided on the downstream pond bottom 10b are connected to the sand collecting pit 42. A space forming member 8 is provided in the trough 3. The space forming member 8 extends along the trough 3, and is provided at the downstream end of the space forming member 8 provided at the upstream pond bottom 10a and the space provided at the downstream pond bottom 10b. Each of the upstream end portions of the forming member 8 projects into the sand collecting pit 42. A detailed description of the trough 3 and the space forming member 8 will be described later.

A sand lifting pump 51 is provided in the sand collecting pit 42. The sand pump 51 is arranged on the bottom surface of the sand collecting pit 42, and conveys the sand collected in the sand collecting pit 42 to the outside of the sand basin 1. Further, the sand pump 51 is detachably connected to the sand lifting pipe 52 (see FIG. 1), and the sand sucked into the sand pump 51 from the suction port located near the bottom surface of the sand collecting pit 42 is collected. It is sent to the outside of the sand basin 1 through the sand lifting pipe 52. That is, the sand lifting pump 51 corresponds to an example of the removing means. The sand pump 51 can be pulled up from the sand collecting pit 42 to the ground for maintenance or the like by removing the sand pump 51 from the sand lifting pipe 52 with the wire attached to the upper end and then pulling up the wire. A cap member 6 is attached to the sand pump 51. When the sand lifting pump 51 is pulled up to the ground, the shade member 6 can also be pulled up to the ground. The cap member 6 corresponds to an example of the surrounding member, but a detailed description will be described later. Further, inside the sand collecting pit 42, a stirring member 53 for discharging water toward the lower side of the suction port of the sand lifting pump 51 is provided. The stirring member 53 discharges water toward the sand accumulated below the suction port of the sand lifting pump 51, and disturbs the sand accumulated below the suction port, thereby closing the suction port of the sand lifting pump 51. It prevents the sand from coming off and promotes the suction of sand.

A pump well (not shown) is provided on the downstream side of the pond bottom 10b on the downstream side. Sewage from which sand has been removed is stored in the pump well. A pump is provided inside the pump well, and the sewage sucked by the pump is sent to a settling basin (not shown).

Next, the discharge member 7 and the peripheral configuration in which the discharge member 7 is arranged will be described with reference to FIGS. 3 to 6. The upstream pond bottom 10a and the downstream pond bottom 10b are symmetrically configured with the sand collecting pit 42 in between. Therefore, in the following description, when the configuration provided on the upstream pond bottom 10a and the configuration provided on the downstream pond bottom 10b are common, the configuration provided on the upstream pond bottom 10a is taken as an example. The description of the configuration provided at the bottom of the pond 10b on the downstream side may be omitted.

FIG. 3A is a sectional view taken along the line BB of the sand basin 1 shown in FIG. 2, and FIG. 3B is a sectional view taken along the line CC of FIG. 2A. In FIG. 3A, the left-right direction of the figure is the width direction, and the direction from the back side of the figure to the front side of the figure is the transfer direction. Further, in FIG. 3B, the right direction in the figure is the transfer direction.

As shown in FIGS. 1, 2 and 3 (a), the discharge member 7 is provided with a water supply pipe 70 connected to the rear end portion and a discharge port 7a at the tip end portion thereof. The water supplied from the water supply pipe 70 to the discharge member 7 is discharged from the discharge port 7a in the transfer direction. In the present embodiment, the discharge flow velocity of the water discharged from the discharge port 7a is set to 8 m / sec or more, and the discharge pressure is set to 0.05 MPa or more and 0.3 MPa or less. Further, as will be described later, in the present embodiment in which the total length of the trough 3 is set to about 10 m, the flow rate of water discharged from the discharge port 7a is adjusted to about 2000 liters per minute. Here, when the total length of the trough 3 is set to about 5 m, the flow rate of water discharged from the discharge port 7a is adjusted to about 1500 liters per minute. In this way, the flow rate of the water discharged from the discharge port 7a may be appropriately adjusted according to the total length of the trough 3 and the like. The water discharged from the discharge port 7a may be sewage received at the sewage treatment plant, but may be another fluid.

Further, as shown in FIGS. 3A and 3B, an auxiliary trough 30, an auxiliary space forming member 80, and a first support plate 91 are provided in the region where the discharge member 7 is arranged. The auxiliary trough 30 has the same cross-sectional shape in the width direction as the trough 3, but is significantly shorter in the transfer direction than the trough 3 (see FIGS. 1 and 2). Further, the auxiliary space forming member 80 also has the same cross-sectional shape in the width direction as the space forming member 8, but the length in the transfer direction is significantly shorter than that of the space forming member 8 (see FIGS. 1 and 2). Further, the length in the transfer direction is about half that of the auxiliary trough 30. The auxiliary trough 30 and the auxiliary space forming member 80 are fixed to the upstream side in the transfer direction of the first support plate 91 by a fastening member 913 composed of bolts and nuts. The trough 3 and the space forming member 8 are fixed to the first support plate 91 on the downstream side in the transfer direction by welding.

FIG. 4A is a plan view of the discharge member 7, and FIG. 4B is a side view of the discharge member 7 shown in FIG. 4A as viewed from below. In FIG. 4A, the vertical direction is the width direction, and in FIG. 4B, the direction orthogonal to the paper surface is the width direction, and the right direction is the transfer direction. As shown in FIGS. 4 (a) and 4 (b), the discharge member 7 is configured by connecting two L-shaped pipes 71 and 72, a linear pipe 73, and a nozzle portion 74. In the present embodiment, the nozzle portion 74 is formed by crushing a round pipe into a flat shape, and a discharge port 7a is formed at the tip thereof. If the aspect of forming the nozzle portion 74 by crushing the round pipe into a flat shape is adopted in this way, the production thereof becomes easy. The straight pipe 73 is provided with mounting pieces 731 and 731 extending outward in the width direction, respectively.

FIG. 5A is a front view of the auxiliary trough 30 (viewed from the downstream side), and FIG. 5B is a side view of the auxiliary trough 30 shown in FIG. 5A as viewed from the left side. .. In FIG. 5A, the left-right direction of the figure is the width direction, and in FIG. 5B, the right direction of the figure is the transfer direction. As shown in FIGS. 5A and 5B, the auxiliary trough 30 has a shape in which the upper portion of the round pipe is cut out, similarly to the trough 3 described in detail. Further, the auxiliary trough 30 is provided with a plate-shaped flange portion 31 at an end portion on the downstream side in the transfer direction (right side in FIG. 5B). A bolt hole 31a through which a bolt fixed to the first support plate 91 is passed is formed in the flange portion 31. The auxiliary trough 30 corresponds to a groove like the trough 3, and a pair of support pieces 32, 32 extending inward in the width direction are provided on the groove defining surface 30a for determining the groove.

FIG. 6A is a front view (viewed from the downstream side) of the auxiliary space forming member 80, and FIG. 6B is a view of the auxiliary space forming member 80 shown in FIG. 6A from the left side. It is a side view. In FIG. 6B, the right direction in the figure is the transfer direction. As shown in FIGS. 6A and 6B, the auxiliary space forming member 80 has a shape in which the lower portion of the round pipe is cut out, similarly to the space forming member 8 described in detail later. Further, the auxiliary space forming member 80 is provided with a plate-shaped flange portion 81 at an end portion on the downstream side in the transfer direction (right side in FIG. 6B). A bolt hole 81a through which a bolt fixed to the first support plate 91 is passed is formed in the flange portion 81.

As shown in FIGS. 3 (a) and 3 (b), the auxiliary trough 30 has four flange portions 31 joined to the surface of the first support plate 91 on the downstream side in the transfer direction in the present embodiment. It is fixed to the first support plate 91 by the fastening member 913. Further, in the present embodiment, the auxiliary space forming member 80 is fixed to the first support plate 91 by five fastening members 913 in a state where the flange portion 81 is joined to the surface of the first support plate 91 on the downstream side in the transfer direction. ing. As a result, a device is devised so as not to inadvertently create a gap between the auxiliary trough 30 and the auxiliary space forming member 80 and the first support plate 91. Further, as described above, the trough 3 is fixed to the surface of the first support plate 91 on the upstream side in the transfer direction, and the auxiliary trough 30 and the trough 3 are continuous in the transfer direction with the first support plate 91 interposed therebetween. It is connected in the state of. Further, a space forming member 8 is fixed to the surface of the first support plate 91 on the upstream side in the transfer direction, and the auxiliary space forming member 80 and the space forming member 8 are also continuous in the transfer direction with the first support plate 91 interposed therebetween. It is connected in the state of.

The discharge member 7 is fixed to the auxiliary trough 30 by the fastening member 732 in a state where the mounting piece 731 is mounted on the support piece 32 of the auxiliary trough 30. As a result, as shown in FIG. 3B, the discharge port 7a is arranged at a position where it has entered the auxiliary space forming member 80, and in the present embodiment, as shown by the solid arrow, the transfer direction from the discharge port 7a. The discharge member 7 is supported in a posture in which water is discharged in a substantially horizontal direction toward. If the auxiliary space forming member 80 is removed from the first support plate 91 and the discharge member 7 is removed from the auxiliary trough 30 and the water supply pipe 70, the discharge port 7a that has entered the auxiliary space forming member 80 can be removed from the auxiliary space forming member 80. It can be taken out from the state where it has entered the 80. As a result, for example, when the discharge port 7a is clogged with a contaminant, maintenance such as removing the contaminant can be performed.

As shown in FIG. 3A, the first support plate 91 is a plate material having a rectangular shape in the lower portion and a trapezoidal outer shape in the upper portion. In the figure, the portion 911 buried in the cast concrete is shown by cross-hatching. Further, the first support plate 91 is a space S20 in the auxiliary space forming member 80 (see FIG. 3B) among the space S10 in the auxiliary trough 30 (see FIG. 3B) and the space S1 in the trough 3. ) And the space S2 of the space forming member 8 are continuous, a first opening 91a is formed, and a second opening 91b is formed in a donut shape of about 1/3 in the lower portion. As a result, of the space S1 in the trough 3 and the space S10 in the auxiliary trough 30, the portions other than the first opening 91a and the second opening 91b are partitioned in the transfer direction by the first support plate 91. This partitioned portion is indicated by hatching with a large interval in the figure, and may be hereinafter referred to as a first compartment portion 912. The auxiliary space forming member 80 is supported by the first support plate 91 by fixing the auxiliary space forming member 80 with the fastening member 913 on the surface of the first section portion 912 on the upstream side in the transfer direction. Further, the space forming member 8 is supported by the first support plate 91 by fixing the space forming member 8 to the surface of the first section portion 912 on the downstream side in the transfer direction by welding. The first support plate 91 is a plate material having a thickness of about 3 mm provided along a direction intersecting the extending direction of the space forming member 8 (vertical direction in the present embodiment), and is a direction (height) orthogonal to the thickness direction. The length in the thickness direction is shorter than the length in the vertical direction. As a result, contaminants such as sand are less likely to accumulate on the first support plate 91, and string-like contaminants are less likely to wrap around. That is, the first support plate 91 corresponds to an example of a support member.

The first support plate 91 is arranged at a position close to the discharge port 7a in the transfer direction, and the water discharged from the discharge port 7a passes through the first opening 91a of the first support plate 91 in a strong state. As a result, the first support plate 91 has a relative adverse effect of partitioning the space S1 in the trough 3 as compared with the second support plate 92, which will be described later, which supports the downstream end portion of the space forming member 8 in the transfer direction. small. Therefore, in the present embodiment, the support of the space forming member 8 and the auxiliary space forming member 80 is emphasized, and the second opening 91b of the first support plate 91 is made into a donut-shaped opening of about 1/3, and the space forming member. A mode is adopted in which a portion for fixing the 8 and the auxiliary space forming member 80 is sufficiently secured.

Further, the first section portion 912 has a portion located above the space forming member 8 and the auxiliary space forming member 80. Hereinafter, the portion of the first section portion 912 located above the space forming member 8 and the auxiliary space forming member 80 may be referred to as a partition portion 9121. In FIG. 3A, the alternate long and short dash line is used to distinguish the partition portion 9121 from the other portions. When a stone block R (indicated by a two-dot chain line in the figure) larger than the distance C between the auxiliary trough 30 and the auxiliary space forming member 80 is received by the sand basin 1, the upper edge of the groove defining surface 30a in the auxiliary trough 30 is received. It may get caught between the auxiliary space forming member 80 and the auxiliary space forming member 80. In the present embodiment, such a large stone block R can be blocked by a partition portion 9121 in the first section portion 912 of the first support plate 91. That is, at least the partition portion 9121 of the first section portion 912 of the first support plate 91 corresponds to the partition member.

FIG. 7 is a cross-sectional view taken along the line DD of the sand basin 1 shown in FIG. In FIG. 7, the left-right direction is the width direction, and the direction from the back side of the paper surface to the front side of the paper surface is the transfer direction. Further, in FIG. 7, for simplification of the drawing, only the discharge port 7a of the discharge members 7 is shown, and the first support plate 91 is omitted.

As shown in FIG. 7, the inclined surfaces 41 provided on both sides of the trough 3 in the width direction are inclined downward by about 30 degrees toward the trough 3. The trough 3 has a space S1 formed therein and has an arc-shaped groove defining surface 3a that defines the groove, and has an upper edge 3b at the upper end portion of the groove defining surface 3a. Further, the trough 3 has a shape in which approximately 1/3 of the upper part of a stainless steel cylinder having a total length of 10 m, a diameter of 300 mm, and a plate thickness of about 3 mm is cut out, and is open upward. Hereinafter, the portion that opens upward is referred to as an opening of the trough 3. The cross-sectional shape of the trough 3 in the width direction is not limited to the arc shape, and may be a U shape, a V shape, or the like.

The space forming member 8 partitions the space S1 in the trough 3 and forms the space S2 in which the portion above the lower end is closed. Further, the space forming member 8 has a shape in which approximately 1/6 below a stainless steel cylinder having a diameter of 150 mm and a plate thickness of about 3 mm is cut out, has an arcuate side surface 8a, and faces downward. Is open. Hereinafter, this open portion will be referred to as a suction port 8b. The suction port 8b is an opening having an opening length L in the width direction, and in the present embodiment, the opening length L in the width direction of the suction port 8b is set to a bar (FIGS. 1 and 1) on the filtration screen 23 of the dust remover 2. It is set to be larger than the interval (see 2), for example, about 80 mm. The size of the opening length L in the width direction of the suction port 8b is not particularly limited, but in order to prevent contaminants that have passed through the filtration screen 23 from clogging the suction port 8b, the suction port 8b It is preferable to set the opening length L in the width direction to be equal to or larger than the bar spacing (mesh width) in the filtration screen 23 of the dust remover 2. In the present embodiment, the lower end portion of the space S2 connected to the suction port 8b becomes narrower as it approaches the suction port 8b, and in order to adopt this aspect, the opening length in the width direction of the suction port 8b is adopted. L may be made smaller than the diameter of the space forming member 8. As will be described in detail later, the space forming member 8 has a total length slightly longer than the total length of the trough 3.

As described above, the space forming member 8 is supported by the first support plate 91 (see FIG. 3) at the end on the upstream side in the transfer direction, and the end on the downstream side in the transfer direction is the second end described in detail later. It is supported by a support plate 92 (see FIG. 8). As shown in FIG. 7, in the present embodiment, the radial center of the space forming member 8 is aligned with the radial center of the trough 3. Therefore, the radial distance C between the trough 3 and the space forming member 8 is substantially the same in all locations, and 80 mm or more is secured in the present embodiment. In this way, as with the opening length L in the width direction of the suction port, the distance C between the trough 3 and the space forming member 8 is secured to be equal to or larger than the mesh width of the filtration screen 23 (75 mm in this case), so that it is on the upstream side. It is suppressed that the contaminants that have passed through the filtration member of the above are clogged in the interval C. Further, in the present embodiment, since the radial center of the space forming member 8 is aligned with the radial center of the trough 3, a space C equal to or larger than the mesh width of the filtration screen 23 is secured at any location. It becomes easy.

The sand contained in the sewage that has flowed into the sand basin 1 settles in the pond bottom 10 and the sand collection pit 42 in the process of the sewage flowing downstream. Of the sand that has settled on the bottom of the pond 10a on the upstream side, the sand that has settled on the inclined surface 41 flows down further toward the trough 3 along the inclined surface 41 as shown by the straight arrow in the figure, and the opening of the trough 3 is reached. It enters the gap between the trough 3 and the space forming member 8. Sand also settles on the space forming member 8, but since it is arcuate, it is difficult for sand to accumulate, and the sand that has settled on the space forming member 8 runs along the arcuate side surface 8a to form a space with the trough 3. It enters the gap with the member 8. Therefore, the sand that has settled on the upstream pond bottom 10a is deposited in the trough 3. Further, when a stone block R or the like larger than the distance C between the trough 3 and the space forming member 8 flows in, it is caught between the upper edge 3b of the groove defining surface 3a and the space forming member 8. .. In the present embodiment, since the dust remover 2 is provided on the upstream side of the sand basin 1, a stone block R or the like larger than the mesh width of the filtration screen 23, that is, the distance C between the trough 3 and the space forming member 8 is formed. It is unlikely that it will pass through the filtration screen 23 and flow into the upstream pond bottom 10a. However, depending on the orientation of the stone block when passing through the filtration screen 23, the stone block R or the like having a size such that it is caught between the upper edge 3b of the trough 3 and the space forming member 8 is carelessly formed on the filtration screen 23. There is a possibility that it will flow into the upper pond bottom 10a on the upstream side. Further, when the dust remover 2 is provided not on the upstream side but on the downstream side of the sand basin 1, there is a possibility that a stone block R or the like larger than the distance C between the trough 3 and the space forming member 8 flows in. It gets higher.

As shown in FIG. 7, in the present embodiment, the discharge port 7a is arranged so that the position viewed from the transfer direction is the center of the space S2 in the space forming member 8. As described above, the discharge port 7a has an elongated hole shape formed by flattening the tip of the pipe-shaped water supply pipe, and the opening length W in the width direction thereof is set in the width direction of the suction port 8b. It is set longer than the opening length L of. Specifically, the opening length W in the width direction of the discharge port 7a in the present embodiment is about 120 mm, and its height H is about 20 mm. By forming the discharge port 7a in such a flat shape, it is possible to secure a wider range in which the flow velocity is increased than in the case of a perfect circle shape. The opening length of the discharge port 7a in the width direction can be increased to the full inside of the space forming member 8 as shown by the alternate long and short dash line in the figure. However, as the opening length of the discharge port 7a in the width direction is increased, the gap between the discharge port 7a and the auxiliary trough 30 (see FIG. 3) becomes smaller, and the gap is likely to be clogged with dust or the like, or the discharge member. When removing 7 (see FIG. 3), there may be a problem that the auxiliary trough 30 is interfered with. Therefore, it is preferable to determine the opening length W in the width direction of the discharge port 7a within a range in which such inconvenience does not occur. Water is discharged from the discharge port 7a in parallel with or substantially parallel to the axis of the space forming member 8. That is, water is discharged in a horizontal direction or a substantially horizontal direction (see the solid arrow pointing to the right in FIG. 3B).

When water is discharged from the discharge port 7a into the space S2 of the space forming member 8, a pressure difference is generated between the inside (space S2) and the outside of the space forming member 8 and is deposited in the trough 3 (space S1). The sand is sucked into the space S2 from the suction port 8b as shown by the curved arrow shown in FIG. 7. Further, in the space S2 of the space forming member 8, the sucked sand moves toward the sand collecting pit 42 (see FIGS. 1 and 2) by the flow of water discharged from the discharge port 7a. By the way, the suction port 8b of the space forming member 8 functions as a suction port for sucking the sand accumulated in the trough 3 into the space S2 by discharging water from the discharge port 7a. Depending on the shape of the sand and the size of the sand discharged from the discharge port 7a, the sand sucked into the space S2 may function as a discharge port due to the force of the fluid discharged from the discharge port 7a. In the present embodiment, since the opening length W in the width direction of the discharge port 7a is longer than the opening length L in the width direction of the suction port 8b, it is compared with the suction force of sucking an object into the space S2 from the suction port 8b. The discharge force for discharging the sand in the space S2 from the suction port 8b is relatively weakened. As a result, it is possible to prevent the suction port 8b from functioning as a discharge port for discharging sand in the space S2, and to sufficiently send sand to the sand collection pit 42. Even if the opening length W in the width direction of the discharge port 7a is smaller than the opening length L in the width direction of the suction port 8b, the sand accumulated in the trough 3 is sucked into the space S2 from the suction port 8b. Can be made. However, as described above, when the suction port 8b functions as a discharge port, the sand moving in the space S2 may come out from the suction port 8b before reaching the sand collection pit 42. is there. Therefore, in order to move the sand farther, it is preferable that the opening length W in the width direction of the discharge port 7a is longer than the opening length L in the width direction of the suction port 8b.

In the present embodiment, the height position of the discharge port 7a is arranged at the center of the space S2 of the space forming member 8, and as shown in FIG. 3B, the discharge port 7a is horizontally or substantially horizontal. A configuration is adopted in which water is discharged in the direction, but as shown by the one-point chain line in FIG. 3B, the position of the discharge port 7a in the height direction is below the center of the space S2 of the space forming member 8. It is also possible to adopt a configuration in which water is discharged slightly upward from the discharge port 7a. By doing so, it is possible to improve the suction force for sucking sand into the space S2 from the suction port 8b, particularly in the region near the discharge port 7a.

Further, especially when there is a large amount of sand accumulated in the space S1 of the trough 3, the accumulated sand moves toward the sand collecting pit 42 even outside the space S2 as the sand moves in the space S2 of the space forming member 8. To do. The stone block R caught between the upper edge 3b of the trough 3 and the space forming member 8 may also move toward the sand collecting pit 42 so as to be dragged by the movement outside the space S2.

Next, with reference to FIG. 8, the structure of the end portion of the trough 3 on the downstream side in the transfer direction, the structure of the end portion of the space forming member 8 on the downstream side in the transfer direction, and the second support plate 92 supporting them will be described. ..

8 (a) is an EE cross-sectional view of the sand basin 1 shown in FIG. 2, and FIG. 8 (b) is an enlarged cross-sectional view showing an enlarged portion F surrounded by a circle in the sand basin 1 shown in FIG. It is a figure. In FIG. 8A, the left-right direction is the width direction, and the cap member 6 described in detail is omitted. In FIG. 8B, the right direction is the transfer direction.

As shown in FIGS. 8A and 8B, the second support plate 92 is a rectangular plate material. Further, as shown in FIGS. 1, 2 and 8 (b), the second support plate 92 is provided at a position where the surface on the downstream side in the transfer direction faces the sand collecting pit 42, and is provided in FIG. 8 (a). ), The placed concrete exists on the upstream side in the transfer direction (the back surface side in FIG. 8A) of the portion 921 indicated by the cross hatching. As shown in FIG. 8B, the space forming member 8 penetrates the second support plate 92 in the transfer direction, and the end portion of the space forming member 8 on the sand collecting pit 42 side is a sand collecting pit 42 rather than the second support plate 92. The space forming member 8 projects inward, that is, the space forming member 8 projects toward the sand collecting pit 42 side (transfer direction) from the end portion of the trough 3 on the sand collecting pit 42 side. Hereinafter, the portion of the space forming member 8 that protrudes into the sand collecting pit 42 may be referred to as a protruding portion 8c. The space forming member 8 is supported by the second support plate 92 by being fixed by welding in a state where the space forming member 8 penetrates the second support plate 92.

By the way, when the end of the space forming member 8 on the sand collecting pit 42 side is aligned with the end of the trough 3 on the sand collecting pit 42 side, the water discharged from the discharge port 7a reaches the sand collecting pit 42. Immediately after, it diffuses into the space of the sand collecting pit 42. Therefore, in the portion near the sand collecting pit 42 of the space forming member 8, the pressure difference between the inside and the outside of the space forming member 8 becomes small and the suction force decreases, and the sand collecting pit in the space S2 of the space forming member 8 It has become clear that a part of the sand that has moved toward the 42 may come out from the suction port 8b before reaching the sand collecting pit 42, and the sand may not reach the sand collecting pit 42. Since the space forming member 8 of the present embodiment has the protruding portion 8c, the space is shown by the most upstream arrow among the three curved arrows indicating the flow of water in FIG. 8 (b). Even if the sand moving toward the sand collecting pit 42 in S2 falls from the suction port 8b on the upstream side of the downstream end of the space forming member 8, the sand is collected in the sand collecting pit 42. We have adopted a configuration that makes it easy to reach. Thereby, in the present embodiment, more sand can be transferred to the sand collecting pit 42.

Similar to the first support plate 91, the second support plate 92 has a first opening 92a formed in a region of the space S1 in the trough 3 in which the space S2 of the space forming member 8 is connected to the sand collecting pit 42. Further, a second opening 92b is formed in a donut shape of about 1/2 in the lower portion. As a result, the portion of the space S1 in the trough 3 other than the first opening 92a and the second opening 92b is partitioned in the transfer direction by the second support plate 92. This partitioned portion is indicated by hatching with a large interval in the figure, and may be hereinafter referred to as a second compartment portion 922. The space forming member 8 is supported in a state of penetrating the second compartment portion 922. Like the first support plate 91, the second support plate 92 is also a plate material having a thickness of about 3 mm provided along the direction intersecting the extending direction of the space forming member 8 (vertical direction in the present embodiment). The length in the thickness direction is shorter than the length in the direction orthogonal to the thickness direction (height direction). As a result, contaminants such as sand are less likely to accumulate on the second support plate 92, and string-like contaminants are less likely to wrap around. That is, the second support plate 92 also corresponds to an example of the support member. Both the first support plate 91 and the second support plate 92 may be inclined in the vertical direction.

As described above, the momentum of the water discharged from the discharge port 7a becomes relatively weaker toward the downstream side, so that the second support plate 92 of the present embodiment is more water than the support of the space forming member 8. The size of the second opening 92b is set to be larger than that of the second opening 91b of the first support plate 91, with an emphasis on the point of passing through.

Further, the second section portion 922 also has a partition portion 9221 located above the space forming member 8 as shown by the alternate long and short dash line in FIG. 8A. Even if a stone block R larger than the distance C between the auxiliary trough 30 and the auxiliary space forming member 80 flows, it can be blocked by the partition portion 9221 in particular. That is, at least the partition portion 9221 of the second section portion 922 of the second support plate 92 corresponds to the partition member. Further, the partition portion 9221 is formed larger than the partition portion 9121 of the first support plate 91 shown in FIG. 3A. This is because the sand lifting pump 51 (see FIGS. 1 and 2) arranged in the sand collecting pit 42 is prevented from being clogged with contaminants such as a large stone block, so that the large stone block immediately before the sand collecting pit 42 The intention is to reliably block R. As shown in FIGS. 2 and 3A, the partition portion 9121 of the first support plate 91 has the height of the upper end 41a of the inclined surface 41 (see FIGS. 9A, 13C, etc.). It is provided at a position lower than the position, and as shown in FIGS. 2 and 8A, even in the partition portion 9221 of the second support plate 92, the height position of the upper end 41a of the inclined surface 41 It is provided at a lower position than. Here, if the flow of water is blocked in the transfer direction, the flow velocity of water increases at that portion and sand becomes difficult to settle. Therefore, these partition portions 9121 and 9221 limit the height of the partition portions 9121 and 9221 so as not to block the flow of water more than necessary.

The downstream side pond bottom portion 10b has a symmetrical configuration with the upstream side pond bottom portion 10a described above as an example with the sand collecting pit 42 interposed therebetween. Therefore, the discharge port 7a at the downstream pond bottom 10b is arranged at the downstream end of the downstream pond bottom 10b, and water is discharged from the discharge port 7a toward the upstream side. As a result, the water discharge direction of the discharge port 7a, that is, the transfer direction is opposite to that of the upstream pond bottom 10a, and sand moves in the space S2 in the space forming member 8 from the downstream side to the upstream side. It is collected in the sand collection pit 42. When a large contaminant flows into the sand basin 1, there is a high possibility that it will settle in the upstream pond bottom 10a, which is larger than the distance C between the trough 3 and the space forming member 8 in the downstream pond 10b. It is unlikely that stone blocks R and the like will flow in. Further, even if a large stone block R or the like is sandwiched between the trough 3 and the space forming member 8 at the bottom of the pond 10b on the downstream side, the sandwiched stone is formed because water flows from the upstream side to the downstream side. The lump R and the like are difficult to move to the sand collecting pit 42. For these reasons, in the downstream pond bottom portion 10b, a mode in which the partition portion 9121 of the first support plate 91 shown in FIG. 3A is omitted or the area is reduced can be adopted, and also in FIG. 8A. The partition portion 9221 of the second support plate 92 shown in the above may be omitted, or an embodiment in which the area is reduced may be adopted.

Further, as shown in FIGS. 1, 2 and 8 (b), in the present embodiment, the partition portions 9121 and 9221 are devised to prevent contaminants such as large stone blocks from being clogged in the sand lifting pump 51. In addition, a cap member 6 is also provided. The cap member 6 will be described with reference to FIG.

9 (a) is an enlarged view of the sand collecting pit 42 of the sand basin 1 shown in FIG. 1 and the G portion surrounding the sand collecting pit 42 and its peripheral portion in a circle, and FIG. 9 (b) is a view showing the same FIG. FIG. 5C is a sectional view taken along the line HI, and FIG. 6C is a sectional view taken along the line II of FIG. In FIGS. 9A and 9B, the left side is the upstream side and the right side is the downstream side. In FIG. 9C, the left-right direction is the width direction. FIG. 9D is a perspective view of the shade member 6 shown in FIG. 9A as viewed from diagonally upper left on the upstream side.

As shown in FIGS. 9 (a) to 9 (c), the cap member 6 secures a flow path from the trough 3 and the space forming member 8 to the sand pump 51 of the sand collecting pit 42. It surrounds 51. That is, the cap member 6 corresponds to an example of the surrounding member. The surrounding member may be a member that surrounds the sand lifting pump 51 by blocking a portion other than the flow path from the trough 3 and the space forming member 8 to the sand pump 51 of the sand collecting pit 42. The cap member 6 surrounds the sand lifting pump 51 with a predetermined gap.

As shown in FIGS. 9A to 9D, the shade member 6 includes a ceiling portion 61 located on the upper surface, partition walls 62 and 62 provided on the upstream and downstream sides of the ceiling portion 61, and a lift. It includes a first side wall portion 63 that forms a side wall on the side where the sand pipe 52 is located, and a second side wall portion 64 that forms the other side wall. The shade member 6 of the present embodiment surrounds the sand pump 51 and covers the sand pump 51 with a ceiling portion 61.

The ceiling portion 61 has a substantially rectangular shape, and is for avoiding the protruding portions 611 and 611 protruding to the upstream side and the downstream side, the through hole 61a provided in the substantially center of the plan view, and the sand lifting pipe 52. It has a substantially U-shaped notch 61b. Further, the cap member 6 is attached to the sand lifting pump 51 by a fastening member (not shown) in a state where the sand lifting pump 51 penetrates through the through hole 61a of the ceiling portion 61. As a result, as described above, by pulling up the sand lifting pump 51 from the sand collecting pit 42, the cap member 6 can also be pulled up from the sand collecting pit 42.

The partition wall 62 hangs down from the protruding portion 611 of the ceiling portion 61 in a substantially inverted triangular shape, and the lower end portion is cut out in an arc shape. Further, as shown in FIGS. 9 (a) and 9 (b), the partition wall 62 has a second support plate on the upstream side of the second support plate 92 on the upstream side pond bottom 10a and a second support plate on the downstream side pond bottom 10b. It is located on the downstream side of 92. That is, the partition wall 62 is located on the upstream side in the transfer direction with respect to the second support plate 92. As a result, as described above, the stone block R (see FIG. 8A, etc.) that has moved toward the sand collecting pit 42 due to the transfer of sand by the water discharged from the discharge port 7a first has a partition wall. It is dammed by 62. If there is a stone block R that has passed through the partition wall 62, it is finally blocked by the second support plate 92. The partition wall 62 may be located downstream of the second support plate 92 in the transfer direction. However, in this embodiment, if a stone block or the like is caught between the partition wall 62 and the second support plate 92, the partition wall 62 moves due to vibration or the like when the sand lifting pump 51 is driven, and the partition wall 62 and the partition wall 62 A stone block or the like sandwiched between the second support plate 92 may fall into the sand collecting pit 42. On the other hand, as shown in FIG. 9, if the partition wall 62 is located upstream of the second support plate 92 in the transfer direction, even if the partition wall 62 moves, the partition wall 62 and the second support A stone block or the like sandwiched between the plate 92 and the plate 92 does not fall into the sand collecting pit 42.

Further, as shown in FIG. 9C, the partition wall 62 has a trough 3 and a space formed between the partition wall 62 and the space forming member 8 because the lower end portion thereof is cut out in an arc shape. A space having substantially the same size as the space with the member 8 is provided.

The first side wall portion 63 is a position sandwiched between a pair of rectangular wall portions 631, 631 provided at intervals in the transfer direction and these rectangular wall portions 631, 631, and is a notch portion of the ceiling portion 61. It has a U-shaped wall portion 632 that hangs down from 61b. The U-shaped wall portion 632 contacts the sand lifting pipe 52 of the cap member 6 when the sand pump 51 is removed from the sand lifting pipe 52 and the cap member 6 is taken out from the sand collecting pit 42 together with the sand lifting pump 51. The flow path connected to the suction port of the sand lifting pump 51 from the first side wall portion 63 side is blocked to some extent while avoiding the above. The second side wall portion 64 is a single rectangular wall portion. The first side wall portion 63 and the second side wall portion 64 are arranged with a gap from the bottom of the sand collecting pit 42. By setting this gap, it is possible to adjust the lower limit of the size of the contaminants that prevent the sand pump 51 from reaching.

The cap member 6 makes it possible to prevent contaminants that cause a malfunction in the sand lifting pump 51 from reaching the sand pump 51. Although the ceiling portion 61 is not always necessary, if the sand lifting pump 51 is surrounded and covered with the ceiling portion 61 as in the present embodiment, not only the contaminants flowing from the side but also the contaminants will settle from above. It can also block contaminants.

Next, a modified example of the above-described embodiment will be described. In the subsequent description, the differences from the above-described embodiments will be mainly described, and the components having the same names as the components described so far will be described with the reference numerals used so far. Duplicate description may be omitted.

FIG. 10 is a diagram showing a modified example of the partition member. In FIG. 10, the left-right direction is the width direction.

In the above-described embodiment, as shown in FIGS. 3A and 8A, the partition portion 9121 which is a part of the first support plate 91 and the partition portion 9221 which is a part of the second support plate 92 are Although it has a function as a partition member, it may be configured as a partition member which does not have a function of supporting the space forming member 8. FIG. 10 shows a modified example in which a partition member having no function of supporting the space forming member 8 is provided.

The partition member 93 shown in FIG. 10A has a lower end portion 931 provided substantially linearly in the width direction and is connected to the upper end of the space forming member 8 and the upper edge of the groove defining surface 3a of the trough 3, that is, It is provided so as to be connected to the upper end of the space forming member 8 and the upper edge 3b of the trough 3. As a result, the partition member 93 is provided in a region above the region connected to the upper end of the space forming member 8 and the upper edge 3b of the trough 3. The height dimension of the partition member 93 is set to be substantially the same length as the minimum distance C between the upper edge 3b of the trough 3 and the space forming member 8, and the upper end portion 932 is provided substantially linearly in the width direction. There is. When changing the height position of the space forming member 8 in the trough 3, the lower end portion of the partition member 93 is set to the upper end of the space forming member 8 as shown by the alternate long and short dash line in FIG. 10 (a). It may be provided so as to be connected to the upper edge 3b of the trough 3. According to the partition member 93, the stone block R sandwiched between the space forming member 8 and the upper edge 3b of the trough 3 can be stably dammed.

The partition member 94 shown in FIG. 10B has a lower end portion 941 and an upper end portion 942 formed in an arc shape that is convex upward. The space forming member 8 is arranged at a position on the groove defining surface 3a at the same distance from any upper edge 3b in the direction intersecting the extending direction of the trough 3, and is between the space forming member 8 and the lower end portion 941. Has a distance of substantially the same size as the minimum distance C between the upper edge 3b of the trough 3 and the space forming member 8. Further, the height dimension of the partition member 94 is set to be substantially the same as the interval C. According to this partition member 94, even if a larger stone block R flows in, it can be stably dammed. In particular, a dust remover 2 is provided on the downstream side, and a sand basin in a mode in which a large stone block or the like easily flows. It is useful for.

The partition member 95 shown in FIG. 10C is used in a mode in which the space forming member 8 is not arranged at the center of the trough 3 in the width direction but is arranged at a position biased in the width direction. The space forming member 8 shown in FIG. 10C is arranged on the groove defining surface 3a closer to the first upper edge 3b1 shown on the right side in the figure than on the second upper edge 3b2 shown on the left side in the figure. .. As a result, the minimum distance C2 between the second upper edge 3b2 and the space forming member 8 is larger than the minimum distance C1 between the first upper edge 3b1 and the space forming member 8. The lower end portion 951 and the upper end portion 952 of the partition member 95 are formed in an arc shape that is convex upward, and the minimum distance between the space forming member 8 and the lower end portion 951 is the second upper edge 3b2 and the space forming member 8. It is set to be substantially the same as the minimum interval C2 with. Here, as shown in FIG. 10 (c), the space forming member 8 is the upper edge of either one of the groove defining surfaces 3a in the direction intersecting the extending direction of the trough 3 (here, shown on the left side of the figure). In the embodiment in which the first upper edge 3b1 is arranged closer to the other upper edge (here, the first upper edge 3b1 shown on the right side of the figure) than the second upper edge 3b2), the minimum of the first upper edge 3b1 and the space forming member 8 is set. The minimum distance C2 between the second upper edge 3b2 and the space forming member 8 is larger than the distance C1. In this embodiment, even if the partition member 95 blocks a stone block R or the like smaller than the minimum distance between the second upper edge 3b2 and the space forming member 8, a stone having the same size as the blocked stone block R. The lump R or the like may enter through the gap between the second upper edge 3b2 and the space forming member 8, and the size of the stone lump R or the like to be dammed may vary. In the modified example shown in FIG. 10 (c), the lower end portion 951 of the partition member 95 is provided above the upper end of the space forming member 8 by C2 minutes which is the minimum distance between the second upper edge 3b2 and the space forming member 8. Therefore, the lower limit of the size of the stone block R or the like to be dammed can be made constant.

FIG. 11 is a diagram showing a modified example of the space forming member 8 shown in FIG. 8 (b).

The protruding portion 8c'of the space forming member 8'shown in FIG. 11 is not provided with a suction port 8b at the lower end portion, and is formed in an annular shape when viewed in the transfer direction. By doing so, it is possible to reduce the amount of sand that falls from the suction port 8b before reaching the sand collection pit 42.

12 (a) and 12 (b) are views showing how the first modification of the cap member 6 shown in FIG. 9 corresponds to FIGS. 9 (c) and 9 (d).

As shown in FIGS. 12 (a) and 12 (b), in the shade member 6'of the first modification, the partition walls 62'and 62' hanging from the protruding portions 611 and 611 of the ceiling portion 61 are rectangular. On both sides of the partition walls 62'and 62'in the width direction, rectangular transfer direction side partition walls 621 and 621 hanging from the ceiling portion 61 are provided. In the shade member 6'of the first modification, the partition wall 621 on the transfer direction side makes it possible to block the contaminants flowing into the sand collecting pit 42.

FIG. 13 is a diagram showing a second modification of the cap member 6 shown in FIG. 9 and a modification of the second support plate 92 shown in FIG. 9 corresponding to FIG. 13 (b) is a JJ sectional view of FIG. 13 (a), and FIG. 13 (c) is a KK sectional view of FIG. 13 (a).

As shown in FIGS. 13 (a) to 13 (d), the shade member 6 ″ of the second modification includes an upstream side wall portion 65 on the upstream side and a downstream side wall portion 66 on the downstream side. A rectangular opening 65a is formed in the upstream side wall portion 65, and an opening 66a is similarly formed in the downstream side wall portion 66.

The second support plate 92'of the modified example has a bent portion 923 located on the upper side of the space forming member 8 and bent toward the sand collecting pit 42 side. The bent portion 923 enters the cap member 6 ″ through the openings 65a and 66a of the cap member 6 ″. As a result, the upstream side of the sand collecting pit 42 is blocked by the upstream side wall portion 65 of the cap member 6'' and the bent portion 923 of the second support plate 92', and the downstream side of the sand collecting pit 42 is the cap member. It is blocked by the downstream side wall portion 66 of 6'' and the bent portion 923 of the second support plate 92'. The tip of the bent portion 923 may be slightly inserted into the cap member 6 ″, but in this modified example, the tip 923a of the bent portion 923 is sufficiently inserted into the cap member 6 ″ for safety. The length is set to fit in. Further, the tip 923a of the bent portion is not allowed to enter the cap member 6 ″, but is outside the cap member 6 ″ and faces the upstream side wall portion 65 and the downstream side wall portion 66 with a predetermined gap. May be good. However, the sand pit 42 is caused by the displacement of the upstream side wall portion 65 or the like due to the vibration when the sand lifting pump 51 is driven by the stone block or the like fitted between the tip end 923a of the bent portion and the upstream side wall portion 65 or the like. It may fall into. Therefore, it is more preferable that the tip 923a of the bent portion is inserted into the cap member 6 ″.

FIG. 14 shows an embodiment in which the cap member 6'' of the second modification shown in FIG. 13 and the cap member 6'' of the second modification are used as the third modification in the second support plate 92'of the modification. , 13 (a) to 13 (c) are shown. 14 (b) is an LL sectional view of FIG. 14 (a), and FIG. 14 (c) is an MM sectional view of FIG. 14 (a).

As shown in FIGS. 14 (a) to 14 (c), in the cap member 60 of the third modification, the notch 61b'formed in the ceiling 61'has a large notch so as to avoid the sand pump 51. The U-shaped wall portion 632'hangs down from the notch portion 61b'. As shown in FIGS. 14 (a) and 14 (b), the cap member 60 is separated from the sand lifting pump 51, and as shown in FIGS. 14 (a) to 14 (c), one end is collected. Four support pieces 67 fixed to the side wall 421 of the sand pit 42 are provided, and the other end of these support pieces 67 is fixed to the ceiling portion 61'. As a result, as shown in FIGS. 14 (b) and 14 (c), the cap member 60 is arranged with a gap with respect to the bottom of the sand collecting pit 42. In the embodiment shown in FIG. 14, the sand lifting pump 51 is independently pulled up from the sand collecting pit 42.

Up to this point, the sand basin 1 provided with one trough 3 and one space forming member 8 in each of the upstream pond bottom 10a and the downstream pond 10b has been described as an example. Here, when the length of the upstream side pond bottom portion 10a and the downstream side pond bottom portion 10b in the transfer direction is long, a plurality of troughs 3 are connected in the transfer direction, and a plurality of space forming members 8 are also connected in the transfer direction. It may be the mode to do. Further, the sand collecting pit 42 is provided at the downstream end of the sand basin 1 instead of providing the sand collecting pit 42 between the upstream pond bottom 10a and the downstream pond 10b as shown in FIGS. 1 and 2. The same applies when the pond bottom portion 10 is provided in the portion and the length of the pond bottom portion 10 is increased. In these cases, a plurality of discharge members 7 may be provided at intervals in the transfer direction.

FIG. 15A is a cross-sectional view in the width direction in a mode in which a plurality of troughs 3 and a plurality of space forming members 8 are connected in the transfer direction and a plurality of discharge members 7 are provided, and FIG. 15B is the same. It is an NN cross-sectional view of FIG. In the figure (a), the left-right direction is the width direction, and in the figure (b), the right direction is the transfer direction. That is, in FIG. 3B, the left side is the upstream side in the transfer direction, and the right side is the downstream side in the transfer direction.

As shown in FIG. 15B, the trough 3 and the space forming member 8 provided on the upstream side in the transfer direction have their respective ends on the downstream side in the transfer direction supported by the third support plate 96. The ends of the trough 3 and the space forming member 8 on the upstream side in the transfer direction are supported by the first support plate 91 shown in FIG. Further, as shown in FIG. 15B, the trough 3 and the space forming member 8 provided on the downstream side in the transfer direction have their respective ends on the upstream side in the transfer direction supported by the third support plate 96. .. The ends of the trough 3 and the space forming member 8 on the downstream side in the transfer direction are supported by the second support plate 92 shown in FIG. 8A.

As shown in FIG. 15B, by fixing the third support plates 96 to each other with the overlapping fastening member 963, the two troughs 3 are connected in the transfer direction, and the two space forming members 8 are connected in the transfer direction. ing. As a result, the space S1 in the trough 3 and the space S2 in the space forming member 8 are also connected in the transfer direction. The discharge member 7 is inserted from an insertion port 8d formed at the upper end of the space forming member 8 and is supported in a posture in which water is discharged from the discharge port 7a in a substantially horizontal direction.

As shown in FIG. 15 (a), the third support plate 96 is the space S2 of the space forming member 8 in the space S1 in the trough 3, similarly to the second support plate 92 shown in FIG. 8 (a). A first opening 96a is formed in the region, and a second opening 96b is formed in a donut shape of about 1/2 in the lower portion. As a result, the portion of the space S1 in the trough 3 other than the first opening 96a and the second opening 96b is also partitioned in the transfer direction by the third support plate 96.

FIG. 16 is a diagram showing a modified example of the discharge port whose shape and position are changed with respect to the discharge port 7a shown in FIGS. 3A and 8. In FIG. 16, the left-right direction is the width direction, and only the space forming member 8 and the discharge port of the discharge members are shown.

The discharge port 70a of the first modified example shown by the solid line in FIG. 16 is deformed in an arc shape so that both end portions in the width direction face downward. By doing so, the central portion of the discharge port 70a in the width direction moves away from the suction port 8b of the space forming member 8, and the suction port 8b functions as a discharge port for discharging the sand sucked into the space S2. Can be expected to have the effect of suppressing.

The discharge port 70a'of the second modified example shown by the alternate long and short dash line in FIG. 16 changes its position in the height direction until it comes into contact with the inner peripheral surface 8e of the space forming member 8. Further, the discharge port 70a ″ of the third modified example shown by the alternate long and short dash line in FIG. 16 has an opening length W in the width direction reduced until it is slightly larger than the opening length L in the width direction of the suction port 8b. The position in the height direction is changed until the space forming member 8 comes into contact with the inner peripheral surface 8e. By doing so, the discharge port 70a ″ of the third modification can have a wider range for changing the position in the height direction than the discharge port 70a ″ of the second modification.

As in these modifications, the discharge port has a flat shape in which the height direction is crushed and widens in the width direction, and the opening length W in the width direction is larger than the opening length L in the width direction of the suction port 8b. The shape and placement position can be changed within the range of the requirement that it is long.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, with respect to the first support plate 91, the second support plate 92 and the third support plate 96, the partition members 93, 94, 95, and the cap member 6, slits may be formed in a part or all of them, or a plurality of slits may be formed. A mode may be adopted in which the first partition member 93 or the like suppresses the flow of water in the sand basin 1 by being composed of a slatted member or the like to which the rods are connected.

Even if the constituent requirements are included only in the above-described embodiment and the description of each modified example, the constituent requirements may be applied to the embodiment and other modified examples.

The following will be added, including what has been explained so far.

(Appendix 1) In another solid-liquid separation system, the contaminants contained in the received liquid are settled to the bottom, the settled contaminants are transferred to the accumulation portion, and the contaminants are removed from the accumulation portion. It is a solid-liquid separation system
A groove extending upward toward the accumulating portion at the bottom and opening upward.
A space-forming member provided along the groove, forming a space in which the upper end portion is closed, and a suction port provided below the upper end portion and separated from the bottom portion of the groove.
It is provided with a discharge port for discharging the fluid in the space toward the downstream side in the transfer direction of the contaminant.
The suction port opens in the groove and functions as an opening for sucking the contaminants accumulated in the groove into the space by discharging the fluid from the discharge port.
The space forming member functions as a path for the contaminants sucked into the space to move toward the integrated portion by discharging the fluid from the discharge port, and the end portion on the integrated portion side serves as a path. It is characterized in that it protrudes from the end portion of the groove on the side of the integrated portion.

(Appendix 2) In addition, another solid-liquid separation system causes the contaminants contained in the received liquid to settle to the bottom, transfers the settled contaminants to the accumulation portion, and removes the contaminants from the accumulation portion. A solid-liquid separation system that removes
A groove extending upward toward the accumulating portion at the bottom and opening upward.
A space-forming member provided along the groove, forming a space in which the upper end portion is closed, and a suction port provided below the upper end portion and separated from the bottom portion of the groove.
It is provided with a discharge port for discharging the fluid in the space toward the downstream side in the transfer direction of the contaminant.
The space forming member has an end portion on the integrated portion side that protrudes from the end portion on the integrated portion side in the groove.
The discharge port is characterized in that the fluid is discharged at a discharge pressure of 0.05 MPa or more and 0.3 MPa or less.

That is, the space forming member protrudes from the groove in the transfer direction.

According to this solid-liquid separation system, the space-forming member has an end portion on the integrated portion side that protrudes from the end portion on the integrated portion side in the groove, so that the space-forming member is integrated. Even if the contaminant falls at the end portion on the portion side, the contaminant can easily reach the integrated portion, and a larger amount of the contaminant can be transferred to the integrated portion.

(Appendix 3) Further, in the solid-liquid separation system described in Appendix 2, a support member provided at the end of the groove on the side of the integrated portion, through which the space forming member penetrates, and supporting the space forming member is provided. It may be a thing or a thing.

If the end portion of the space forming member on the integrated portion side protrudes from the end portion on the integrated portion side in the groove, the position of the space forming member with respect to the groove may be difficult to stabilize. .. By supporting the space-forming member by the support member, the position of the space-forming member with respect to the groove can be stabilized.

(Appendix 4) Further, in the solid-liquid separation system described in Appendix 2, the space forming member is provided at the end of the groove on the side of the integrated portion, and the space forming member penetrates the groove in a direction intersecting the extending direction of the groove. It may be provided with a partition member for partitioning the bottom portion.

While the partition member blocks large contaminants that do not enter through the gap, the contaminants that enter through the gap and accumulate at the bottom of the groove can be easily reached to the accumulation portion.
(Appendix 5) In addition, another solid-liquid separation system causes the contaminants contained in the received liquid to settle to the bottom, transfers the settled contaminants to the accumulation portion, and removes the contaminants from the accumulation portion. A solid-liquid separation system that removes
A groove extending upward toward the accumulating portion at the bottom and opening upward.
A space-forming member provided along the groove, forming a space in which the upper end portion is closed, and a suction port provided below the upper end portion and separated from the bottom portion of the groove.
It is provided with a discharge port for discharging the fluid in the space toward the downstream side in the transfer direction of the contaminant.
The discharge port is characterized in that the fluid is discharged at a discharge pressure of 0.05 MPa or more and 0.3 MPa or less, and the opening length in the width direction is longer than the opening length in the width direction of the suction port. And.

1 Sand basin 2 Dust remover 3 Trough 3a Groove demarcation surface 41 Inclined surface 42 Sand collection pit 51 Sand lifting pump 6 Cap member 7 Discharge member 7a Discharge port 8 Space forming member 8b Suction port 91 1st support plate 92 2nd support plate 93 , 94,95 Partition member S1, S2 Space

Claims (1)

A solid-liquid separation system in which contaminants contained in the received liquid are settled to the bottom, the sedimented contaminants are transferred to the accumulation portion, and the contaminants are removed from the accumulation portion.
A groove extending upward toward the accumulating portion at the bottom and opening upward.
A space-forming member provided along the groove, forming a space in which the upper end portion is closed, and a suction port provided below the upper end portion and separated from the bottom portion of the groove.
It is provided with a discharge port for discharging the fluid in the space toward the downstream side in the transfer direction of the contaminant.
The discharge port discharges a fluid at a discharge pressure of 0.05 MPa or more and 0.3 MPa or less, and has a flat shape in which the opening length in the width direction is longer than the opening length in the width direction of the suction port. A solid-liquid separation system characterized by being.