JP2016140795A - Solid-liquid separation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-liquid separation system capable of transferring more contaminants to an accumulation part.SOLUTION: A solid-liquid separation system comprises, in a basin bottom part 10, a trough 3 extending to a sand collection pit 42; a space formation member 8 which has an upper end portion forming a closed space S2 and which has an inlet port 8b provided below the upper end portion; and a delivery port 7a which delivers water within the space S2, the inlet port 8b functions as an opening which draws sand accumulated in the trough 3 into the space S2 by delivery of the water from the delivery port 7a, the space formation member 8 functions as a route in which the sand which has been drawn into the space S2 moves toward a sand collection pit 42 by delivery of the water from the delivery port 7a, and an end portion, which is near the sand collection pit 42, of the space formation member 8 protrudes further than an end portion, which is near the sand collection pit 42, of the trough 3.SELECTED DRAWING: Figure 8

Description

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

  It is one of the solid-liquid separation systems that separate the solid contained in the liquid from the liquid, whether it is a sand basin or a sedimentation basin provided in the sewage treatment facility. The sedimentation basin receives sewage such as sewage or rainwater, sinks the sand contained in the sewage to the bottom of the pond, transfers the sedimented sand to the sand collection pit, and sands the sand collected in the sand collection pit. It is removed by a pump. In addition, the sedimentation basin received the water from which the sand was removed in the sedimentation basin, settled sludge contained in the received water to the bottom of the pond, transferred the sedimented sludge to the sludge pit, and gathered in the sludge pit. Sludge is removed by a sludge pump. In addition, various solid-liquid separation systems are used outside of sewage treatment facilities. For example, metal powder contained in factory wastewater is transferred to a predetermined accumulation section, and collected metal powder is removed by a pump or the like. It is also possible to adopt a mode in which soil and the like that have flowed into a reservoir such as a dam lake are transported to a predetermined accumulation portion, and the collected soil and the like are removed by a pump or the like. Hereinafter, solids separated from liquid by a solid-liquid separation system, such as sand and sludge contained in sewage, metal powder contained in industrial wastewater, or earth and sand that flows into the reservoir together with water, may be referred to as contaminants. is there.

  In these solid-liquid separation systems, a discharge port that discharges 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 aspect in which the fluid is discharged toward the accumulated contaminants, the accumulated 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 rolling-up of the contaminants, this time, the contaminants may not be transported sufficiently. It is difficult to fully transport the contaminants. In view of this, a solid-liquid separation system has been proposed in which a contrivance for sufficiently transferring the contaminants is made while suppressing the rolling-up of the contaminants (see, for example, Patent Document 1).

  The solid-liquid separation system described in Patent Document 1 includes a groove extending toward an accumulation part such as a sand pit and opening upward at a bottom such as a pond bottom, and a groove defining surface that defines the groove. On the other hand, a space forming member having a gap and disposed along the groove and a discharge port for discharging a fluid are provided. For example, the space forming member is formed by cutting out the lower portion of the cylindrical body, forms a space where the upper end portion is closed, and has a suction port opened downward at the lower end. The suction port is spaced from the bottom of the groove. The discharge port has, for example, a flat shape whose height direction is crushed and expanded in the width direction, and fluid is discharged from the discharge port toward the downstream side in the transfer direction of the contaminants. In the solid-liquid separation system described in Patent Document 1, contaminants such as sand contained in sewage or the like enter the gap between the groove defining surface and the space forming member and accumulate on the bottom of the groove. Thus, when fluid is discharged from the discharge port into the space forming member, a pressure difference is generated between the inside and outside of the space forming member, and contaminants accumulated at the bottom of the groove are sucked into the space from the suction port. Further, in the space, the sucked contaminant moves to the downstream side in the transfer direction by the flow of the fluid, and is transferred to the accumulation unit. Contaminants that move in the space are unlikely to go out of the space forming member at the portion where the pressure difference is generated, and curling of the contaminants is suppressed. Therefore, it is possible to suppress the sand roll-up while sufficiently transferring the contaminants. The contaminants transferred to the accumulating unit are removed from the accumulating unit by a removing means such as a pump.

JP 2014-24055 A

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

  In view of the circumstances described above, an object of the present invention is to provide a solid-liquid separation system that can transfer more contaminants to the accumulating unit.

In the solid-liquid separation system of the present invention that solves the above-described object, the contaminants contained in the received liquid are allowed to settle to the bottom, the settled contaminants are transferred to the accumulation portion, and the contaminants are removed from the accumulation portion. A solid-liquid separation system to be removed,
A groove extending toward the accumulation portion at the bottom and opening upward;
A space forming member provided along the groove, forming a space where the upper end portion is closed, and provided with a suction port spaced from the bottom of the groove below the upper end portion;
A discharge port for discharging the fluid in the space toward the downstream side in the transfer direction of the contaminants,
The suction port functions as an opening that opens in the groove and sucks the contaminants accumulated in the groove into the space by discharging fluid from the discharge port.
The space forming member functions as a path for the contaminants sucked into the space to move toward the accumulation portion by discharging fluid from the discharge port, and the end on the accumulation portion side The groove protrudes from the end portion on the accumulation portion side.

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

  According to the solid-liquid separation system of the present invention, the space forming member has an end portion on the accumulation portion side protruding from an end portion on the accumulation portion side of the groove. Even if the contaminant falls at the end portion on the accumulation portion side, the contaminant can easily reach the accumulation portion, and more contaminant can be transferred to the accumulation portion.

  Further, in the solid-liquid separation system of the present invention, the solid-liquid separation system includes a support member that is provided at an end portion of the groove on the accumulation portion side, through which the space forming member penetrates and supports the space forming member. Also good.

  If the end of the space forming member on the stacking portion side protrudes from the end of the groove on the stacking portion side, 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.

  Furthermore, in the solid-liquid separation system according to the present invention, a partition member provided at an end portion of the groove on the accumulation portion side, through which the space forming member penetrates, and partitions the bottom portion in a direction intersecting with the extending direction of the groove. It may be provided.

  While blocking large contaminants that do not enter through the gap by the partition member, contaminants that enter through the gap and accumulate at the bottom of the groove can be easily reached to the accumulation portion.

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

It is the top view which looked at the sand basin equivalent to one Embodiment of this invention from upper direction. It is AA sectional drawing of the sand basin shown in FIG. (A) is BB sectional drawing of the sand basin shown in FIG. 2, (b) is CC sectional drawing of (a). (A) is a top view of a discharge member, (b) is the side view which looked at the discharge member shown to (a) from the downward | lower direction. (A) is the front view (view seen from the downstream side) of an auxiliary trough, (b) is the side view which looked at the auxiliary trough shown to (a) from the left side. (A) is the front view (figure seen from the downstream) of the auxiliary space formation member, (b) is the side view which looked at the auxiliary space formation member shown to (a) from the left side. It is DD sectional drawing of the sand basin shown in FIG. (A) is EE sectional drawing of the sand basin shown in FIG. 2, (b) is an expanded sectional view which expands and shows the F section enclosed with the circle in the sand basin shown in FIG. (A) is a figure which expands and shows the G section which surrounds the sand collection pit and its peripheral part of a sand basin shown in FIG. 1 with a circle, (b) is HH sectional drawing of (a). (C) is II sectional drawing of (a), (d) is the perspective view which looked at the cap member shown to (a) from the left diagonal upper direction of the upstream. It is a figure which shows the modification of a partition member. It is a figure which shows the modification of the space formation member shown in FIG.8 (b). (A) And (b) is a figure which shows a mode corresponding to FIG.9 (c) and the same figure (d) about the 1st modification of the shade member shown in FIG. It is a figure which shows a mode corresponding to FIG. 9 about the 2nd modification of the shade member shown in FIG. 9, and the modification of the 2nd support plate shown in FIG. 13 (a) to (c) with respect to the second modification example shown in FIG. 13 and the second support plate of the modification example, with the second modification example using the shade member of the second modification example as the third modification example. FIG. (A) is sectional drawing of the width direction in the aspect which connects each of several trough and several space formation member to a transfer direction, and provides several discharge members in a transfer direction, (b) is N of (a). It is -N sectional drawing. 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 to Fig.3 (a) or FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The solid-liquid separation device of the present invention is a sand basin or sedimentation basin in a sewage treatment facility, a device that removes metal powder or the like contained in factory effluent, and a sediment or the like that flows into a reservoir such as a dam lake. It can employ | adopt for the apparatus which removes. In the present embodiment, the present invention will be described using an example in which the present invention is adopted in a sand basin. The sand basin is disposed upstream of the sewage treatment facility, and after sedimenting sand contained in sewage such as sewage or rainwater, the sedimented sand is moved to a sand collecting 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 cross-sectional view taken along line AA of the sand basin 1 shown in FIG.

  As shown in FIG. 1, the sand settling basin 1 is a rectangular pond that includes 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 the long side direction, and the short side direction may be referred to as the 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 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 used to remove a lump of mass or debris larger than a predetermined size from the contaminants mixed in the sewage that has flowed into the sand basin 1, and includes a trough 3 and a sand collecting pit. It is installed upstream of 42. The dust remover 2 includes an endless chain 21, a plurality of rakes 22 attached to the endless chain 21 at intervals, and a filtration screen 23 that is submerged in water. The endless chain 21 is provided so as to stand obliquely on both sides in the width direction of the sand basin 1 and is wound around a ground-side sprocket 211 and a pond bottom-side sprocket 212 as shown in FIG. Yes. When the endless chain 21 is driven, the rake 22 enters and exits the water. The filtration screen 23 is disposed on the downstream side of the endless chain 21. In the filter screen 23, bars extending in the vertical direction are arranged at a predetermined interval (for example, 25 mm to 75 mm), and block the passage of contaminants having a size greater than the predetermined interval. In the present embodiment, bars extending in the vertical direction are arranged at intervals of 75 mm. The contaminants blocked by the filter screen 23 are lifted up by the rake 22, and the lifted contaminants are placed on a conveying means such as a belt conveyor (not shown) on the ground side.

  On the downstream side of the dust remover 2, an upstream pond bottom 10a, a sand collecting pit 42, and a downstream pond bottom 10b are provided in the order of description from the upstream side to the downstream side. Hereinafter, when it is not necessary to distinguish the upstream pond bottom 10a and the downstream pond bottom 10b, they may be collectively referred to as the pond bottom 10. WL shown in FIG. 2 represents the surface of sewage. The position of the water surface WL varies depending on the amount of sewage flowing into the sand settling basin 1 in the range from 1 m to 5 m, for example. The sewage sand flowing into the sand settling basin 1 settles in the pond bottom 10 and the sand collecting pit 42, and the sand settled in the pond bottom 10 is collected in the sand collecting pit by water discharged from the discharge port 7a, as will be described later. 42. As a result, the sand in the sewage that has flowed into the sand basin 1 is collected in the sand collecting pit 42. That is, the direction from the discharge port 7a toward the sand collecting pit 42 corresponds to the transfer direction. 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 In 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 a collecting part, and the sand in the sewage that has flowed into the sand basin 1 is a contaminant contained in the received liquid. It corresponds to an example.

  The pond bottom 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 the trough 3 is provided so as to be connected to the inclined surfaces 41 and 41. In this embodiment, the inclined surface 41 is formed by placing concrete. The trough 3 corresponds to a groove that extends toward the sand collecting pit 42 and opens upward in the pond bottom 10. 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, a discharge member 7 having a discharge port 7a described later in detail is provided. ing. Further, the downstream side of the trough 3 provided on the upstream pond bottom 10 a and the upstream side of the trough 3 provided on the downstream pond bottom 10 b 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 on the upstream pond bottom 10a and the space provided on the downstream pond bottom 10b. Each upstream end of the forming member 8 protrudes into the sand collecting pit 42. Detailed description of the trough 3 and the space forming member 8 will be described later.

  The sand collecting pit 42 is provided with a sand pump 51. The sand pump 51 is disposed on the bottom surface of the sand collection pit 42 and conveys the sand collected in the sand collection pit 42 to the outside of the sand basin 1. The sand pump 51 is detachably connected to the sand 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 It is sent to the outside of the settling basin 1 through the sand raising pipe 52. That is, the sand pump 51 corresponds to an example of a removing unit. The sand pump 51 can be removed from the sand pipe 52 with a wire attached to the upper end, and then pulled up from the sand collecting pit 42 to perform maintenance and the like by lifting the wire. A cap member 6 is attached to the sand pump 51. When the sand pump 51 is lifted to the ground, the shade member 6 can be lifted to the ground together. The shade member 6 corresponds to an example of a surrounding member, and will be described in detail 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 pump 51 is provided. The stirring member 53 discharges water toward the sand accumulated below the suction port of the sand pump 51 and disturbs the sand accumulated below the suction port, thereby blocking the suction port of the sand pump 51. It prevents the sand from being removed and promotes the suction of sand.

  A pump well (not shown) is provided further downstream than the downstream pond bottom 10b. The pump well stores sewage from which the sand has been removed. A pumping pump is provided inside the pump well, and the sewage sucked by the pumping pump is sent to a sedimentation basin (not shown).

  Next, the discharge member 7 and the peripheral configuration where the discharge member 7 is arranged will be described with reference to FIGS. The upstream pond bottom 10a and the downstream pond bottom 10b are configured symmetrically with the sand collecting pit 42 interposed therebetween. For this reason, in the following description, when the configuration provided in the upstream pond bottom 10a and the configuration provided in the downstream pond bottom 10b are common, the configuration provided in the upstream pond bottom 10a is taken as an example. The description of the configuration provided in the downstream pond bottom 10b may be omitted.

  Fig.3 (a) is BB sectional drawing of the sand basin 1 shown in FIG. 2, FIG.3 (b) is CC sectional drawing of the figure (a). In FIG. 3A, the left-right direction in the figure is the width direction, and the direction from the back side to the near side in the figure is the transfer direction. 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 has a water supply pipe 70 connected to a rear end portion thereof and a discharge port 7 a at a tip end portion thereof. 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 rate 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 the water discharged from the discharge port 7a is adjusted to about 1500 liters per minute. Thus, the flow rate of the water discharged from the discharge port 7a may be adjusted as appropriate according to the overall length of the trough 3 and the like. In addition, although the water discharged from the discharge port 7a may use the sewage received in the sewage treatment plant, it may be another fluid.

  3A and 3B, the auxiliary trough 30, the auxiliary space forming member 80, and the first support plate 91 are provided in the region where the discharge member 7 is disposed. The auxiliary trough 30 has the same cross-sectional shape in the width direction as that of the trough 3, but is significantly shorter in the transport 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 the space forming member 8 (see FIGS. 1 and 2). Furthermore, 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 transport direction of the first support plate 91 by a fastening member 913 made of a bolt and a nut. The trough 3 and the space forming member 8 are fixed by welding on the downstream side of the first support plate 91 in the transfer direction.

  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. 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 transport direction. As shown in FIG. 4A and FIG. 4B, the discharge member 7 is configured by connecting two L-shaped pipes 71 and 72, a straight 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. Thus, if the aspect which crushes a round pipe into flat shape and forms the nozzle part 74 is employ | adopted, the manufacture will become easy. The linear pipe 73 is provided with mounting pieces 731 and 731 extending outward in the width direction.

  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 viewed from the left side. . In FIG. 5A, the horizontal direction in the figure is the width direction, and in FIG. 5B, the right direction in 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 in the same manner as the trough 3 described later in detail. Further, the auxiliary trough 30 is provided with a plate-like flange portion 31 at the end on the downstream side in the transfer direction (the right side in FIG. 5B). The flange portion 31 is formed with a bolt hole 31 a through which a bolt fixed to the first support plate 91 is passed. The auxiliary trough 30 corresponds to a groove like the trough 3, and a pair of support pieces 32 and 32 extending inward in the width direction are provided on the groove defining surface 30a for defining the groove.

  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. 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 in the same manner as the space forming member 8 described later in detail. Further, the auxiliary space forming member 80 is provided with a plate-like flange portion 81 at the end on the downstream side in the transfer direction (the right side in FIG. 6B). The flange portion 81 is formed with a bolt hole 81 a through which a bolt fixed to the first support plate 91 is passed.

  As shown in FIG. 3A and FIG. 3B, the auxiliary trough 30 has four flanges 31 in the present embodiment in a state where the flange portion 31 is joined to the downstream surface of the first support plate 91 in the transfer direction. It is fixed to the first support plate 91 by a fastening member 913. In addition, the auxiliary space forming member 80 is fixed to the first support plate 91 by five fastening members 913 in the present embodiment 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. Thus, a contrivance is made so as not to inadvertently generate a gap between the auxiliary trough 30 and the auxiliary space forming member 80 and the first support plate 91. Furthermore, as described above, the trough 3 is fixed to the upstream surface of the first support plate 91 in the transfer direction, and the auxiliary trough 30 and the trough 3 are continuous in the transfer direction across the first support plate 91. Connected to the connected state. The space forming member 8 is fixed to the upstream surface of the first support plate 91 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. Connected to the connected state.

  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 placed 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 enters the auxiliary space forming member 80. In this embodiment, as shown by the solid line arrow, the discharge direction from the discharge port 7a is the transfer direction. The discharge member 7 is supported in a posture in which water is discharged in a substantially horizontal direction toward the head. 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 is removed. 80 can be taken out from the state of entering. Accordingly, for example, when the discharge port 7a is clogged with contaminants, it is possible to perform maintenance such as removing the contaminants.

  As shown in FIG. 3A, the first support plate 91 is a plate member having a rectangular shape on the lower side and a trapezoidal shape on the upper side. In the figure, the portion 911 embedded in the placed concrete is indicated by cross hatching. 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 is formed with a first opening 91a, and a second opening 91b is formed in a donut shape of about 1/3 in the lower portion. Thereby, portions of the space S1 in the trough 3 and the space S10 in the auxiliary trough 30 other than the first opening 91a and the second opening 91b are partitioned in the transport direction by the first support plate 91. This partitioned portion is indicated by hatching having a large interval in the drawing, and may be referred to as a first partition portion 912 hereinafter. The auxiliary space forming member 80 is supported by the first support plate 91 by fixing the auxiliary space forming member 80 with a fastening member 913 on the upstream surface of the first partition portion 912 in the transfer direction. Further, the space forming member 8 is supported on the first support plate 91 by fixing the space forming member 8 to the surface of the first partition 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 (the vertical direction in the present embodiment) intersecting with the extending direction of the space forming member 8, and a direction (high height) perpendicular to the thickness direction. The length in the thickness direction is shorter than the length in the thickness direction). Thereby, on the 1st support plate 91, contaminants, such as sand, do not accumulate easily, and a string-like contaminant does not wind easily. That is, the first support plate 91 corresponds to an example of a support member.

  The 1st support plate 91 is arrange | positioned in the position close | similar to the discharge port 7a in the transfer direction, and the water discharged from the discharge port 7a passes the 1st opening 91a of the 1st support plate 91 in a state with strong momentum. As a result, the first support plate 91 is relatively less affected by partitioning the space S1 in the trough 3 than the second support plate 92 described later, which supports the downstream end portion of the space forming member 8 in the transfer direction. small. For this reason, in this embodiment, emphasis is placed on the support of the space forming member 8 and the auxiliary space forming member 80, and the second opening 91b of the first support plate 91 is formed as a donut-shaped opening of about 1/3, and the space forming member. The aspect which fully secures the part which fixes 8 and the auxiliary space formation member 80 is employ | adopted.

  Further, the first partition portion 912 has a portion positioned above the space forming member 8 and the auxiliary space forming member 80. Hereinafter, the portion of the first partition portion 912 that is 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 partition portion 9121 is distinguished from other portions by using a one-dot chain line. When a stone block R (shown by a two-dot chain line in the drawing) 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 And the auxiliary space forming member 80 may be caught. In the present embodiment, such a large stone block R can be blocked by the partitioning portion 9121 in the first partition portion 912 of the first support plate 91. That is, at least the partition portion 9121 of the first partition portion 912 of the first support plate 91 corresponds to a partition member.

  FIG. 7 is a DD cross-sectional view 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 to the front side is the transfer direction. In FIG. 7, only the discharge port 7a of the discharge member 7 is shown, and the first support plate 91 is omitted to simplify the drawing.

  As shown in FIG. 7, the inclined surfaces 41 provided on both sides in the width direction of the trough 3 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 for defining a groove, and an upper edge 3b at an upper end portion of the groove defining surface 3a. The trough 3 has a shape in which approximately 1/3 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 opens upward. Hereinafter, the portion opening upward is referred to as the 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 a space S2 in which a portion above the lower end is closed. The space forming member 8 has a shape in which approximately 1/6 of a lower portion of a stainless steel cylindrical body having a diameter of about 150 mm and a plate thickness of about 3 mm is cut out, has an arc-shaped side surface 8a, and faces downward. Open. Hereinafter, this opened portion is referred to as a suction port 8b. The suction port 8b is an opening having an opening length L in the width direction. In the present embodiment, the suction port 8b has an opening length L in the width direction that is a bar (see FIG. 1 and FIG. 1) in the filter screen 23 of the dust remover 2. 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 opening length L in the width direction is preferably set to be equal to or greater than the bar interval (mesh width) in the filtration screen 23 of the dust remover 2. In addition, in this embodiment, space S2 is so narrow that the lower end part connected to the suction inlet 8b approaches the suction inlet 8b, and in order to employ | adopt this aspect, the opening length of the width direction of the inlet 8b is sufficient. 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 end of the space forming member 8 on the upstream side in the transfer direction is supported by the first support plate 91 (see FIG. 3), and the end on the downstream side in the transfer direction is the second described later in detail. It is supported by a support plate 92 (see FIG. 8). As shown in FIG. 7, in the present embodiment, the center of the space forming member 8 in the radial direction is matched with the center of the trough 3 in the radial direction. Therefore, the radial distance C between the trough 3 and the space forming member 8 is substantially the same at any location, and 80 mm or more is secured in this embodiment. Thus, 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 also secured to the mesh width (75 mm in this case) of the filtration screen 23, so the upstream side It is suppressed that the contaminants that have passed through the filter member are clogged in the interval C. Moreover, in this embodiment, since the center of the radial direction of the space formation member 8 is made to correspond to the center of the radial direction of the trough 3, the space | interval C beyond the mesh width of the filtration screen 23 is ensured in any location. It becomes easy.

  Sand contained in the sewage flowing into the sand settling basin 1 sinks to the pond bottom 10 and the sand collecting pit 42 in a process in which the sewage flows downstream. Of the sand that has settled on the upstream pond bottom 10a, 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 arrows in the figure, and the opening of the trough 3 From the trough 3 and the space forming member 8. Although the sand also sinks to the space forming member 8, since it is arcuate, it is difficult for the sand to accumulate, and the sand that has settled on the space forming member 8 forms a space with the trough 3 through the arcuate side surface 8 a. It enters the gap with the member 8. Therefore, the sand that has settled on the upstream pond bottom 10 a accumulates in the trough 3. In addition, when a stone block R or the like larger than the interval 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 settling basin 1, a stone block R or the like larger than the mesh width of the filtration screen 23, that is, larger than the interval C between the trough 3 and the space forming member 8. There is little possibility of passing through the filtration screen 23 and flowing into the upstream pond bottom 10a. However, depending on the direction of the stone block when passing through the filter screen 23, the stone block R and the like of such a size as to be caught between the upper edge 3b of the trough 3 and the space forming member 8 is inadvertently filtered. May flow into the upstream pond bottom 10a. Further, when the dust remover 2 is provided not on the upstream side of the sand settling basin 1 but on the downstream side, there is a possibility that a stone block R or the like larger than the interval C between the trough 3 and the space forming member 8 will flow in. Get higher.

  As shown in FIG. 7, in the present embodiment, the discharge port 7 a is arranged so that the position seen from the transfer direction is the center of the space S <b> 2 in the space forming member 8. As described above, the discharge port 7a has a long hole shape formed by flattening the tip of a pipe-shaped water supply pipe, and the opening length W in the width direction is defined as the width direction of the suction port 8b. Is set longer than the opening length L. Specifically, the opening length W in the width direction of the discharge port 7a in this embodiment is about 120 mm, and the height H is about 20 mm. By making the discharge port 7a such a flat shape, it is possible to ensure a wider range in which the flow velocity is higher than that of a perfect circle shape. In addition, the opening length of the width direction of the discharge outlet 7a can be enlarged to the full inside of the space formation member 8, as shown with a dashed-two dotted line in a figure. However, as the opening length in the width direction of the discharge port 7a is increased, the gap with the auxiliary trough 30 (see FIG. 3) becomes smaller, and dust or the like is easily clogged in the gap, or the discharge member 7 (see FIG. 3) may cause inconvenience such as interference with the auxiliary trough 30. For this reason, 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 or substantially in parallel with the axis of the space forming member 8. That is, water is discharged in the horizontal direction or in the substantially horizontal direction (see the right-pointing arrow of the solid line in FIG. 3B).

  By discharging water into the space S2 of the space forming member 8 from the discharge port 7a, a pressure difference is generated between the space forming member 8 (space S2) and the outside, and accumulated in the trough 3 (space S1). The sand is sucked into the space S2 from the suction port 8b as indicated by the curved arrow shown in FIG. Furthermore, in the space S <b> 2 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 7 a. By the way, the suction port 8b of the space forming member 8 functions as a suction port that sucks sand accumulated in the trough 3 into the space S2 by discharging water from the discharge port 7a. Depending on the shape and the size of the discharge port 7a, it may function as a discharge port for discharging the sand sucked into the space S2 by the momentum 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, compared to the suction force that sucks in 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. Thereby, it can suppress that the suction inlet 8b functions as a discharge outlet which discharges the sand in space S2, and can fully 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, sand moving in the space S2 may come out of the suction port 8b before reaching the sand collecting pit 42. is there. For this reason, 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 position of the discharge port 7a in the height direction is arranged at the center of the space S2 of the space forming member 8, and as shown in FIG. Although the structure which discharges water to the direction is employ | adopted, as shown by the dashed-dotted line of FIG.3 (b), the position of the height direction of the discharge outlet 7a is below the center of space S2 of the space formation member 8. It is also possible to employ a configuration in which water is discharged from the discharge port 7a slightly upward. This makes it possible to improve the suction force for sucking sand into the space S2 from the suction port 8b, particularly in the vicinity of the discharge port 7a.

  In addition, particularly when there is a lot of sand accumulated in the space S1 of the trough 3, the sand accumulated outside the space S2 moves toward the sand collecting pits 42 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 be moved toward the sand collecting pit 42 by being dragged by the movement outside the space S2.

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

  Fig.8 (a) is EE sectional drawing of the sand basin 1 shown in FIG. 2, FIG.8 (b) is an expanded cross section which expands and shows the F part enclosed in the circle in the sand basin 1 shown in FIG. FIG. In FIG. 8A, the left-right direction is the width direction, and the cap member 6 described later is omitted in detail. 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 8B, 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 FIG. ), The placed concrete exists on the upstream side in the transfer direction of the portion 921 indicated by cross hatching (the back side in FIG. 8A). As shown in FIG. 8B, the space forming member 8 penetrates the second support plate 92 in the transfer direction, and the end portion on the sand collecting pit 42 side is closer to the sand collecting pit 42 than the second support plate 92. In other words, the space forming member 8 protrudes toward the sand collecting pit 42 (in the transfer direction) from the end of the trough 3 on the sand collecting pit 42 side. Hereinafter, the part which protruded in the sand collection pit 42 of the space formation member 8 may be called the protrusion part 8c. The space forming member 8 is supported by the second support plate 92 by being welded and fixed to the second support plate 92 in a state of passing through the second support plate 92.

  By the way, when the end of the space forming member 8 on the sand collecting pit 42 side coincides 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 that, it diffuses into the space of the sand collecting pit 42. For this reason, in the portion near the sand collecting pit 42 of the space forming member 8, the pressure difference between the inside and outside of the space forming member 8 is reduced and the suction force is reduced, so that the inside of the space S 2 of the space forming member 8 passes through the sand collecting pit. It has been found that some of the sand that has moved toward 42 exits 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 protrusion 8c, the space forming member 8 has a space as shown by the most upstream arrow among the three curved arrows indicating the flow of water in FIG. Even when the sand moving toward the sand collecting pit 42 in S2 falls from the suction port 8b upstream of the downstream end of the space forming member 8, the sand is collected into the sand collecting pit 42. The structure that makes it easy to reach is adopted. Thereby, in this embodiment, more sand can be transferred to the sand collecting pit 42.

  Similarly to the first support plate 91, the second support plate 92 has a first opening 92 a formed in a region where the space S 2 of the space forming member 8 is connected to the sand collecting pit 42 in the space S 1 in the trough 3. Further, a second opening 92b is formed in a donut shape of about ½ in the lower portion. Thereby, portions of the space S1 in the trough 3 other than the first opening 92a and the second opening 92b are partitioned by the second support plate 92 in the transport direction. This partitioned portion is indicated by hatching having a large interval in the drawing, and may be hereinafter referred to as a second partition portion 922. The space forming member 8 is supported in a state of penetrating through the second partition portion 922. Similarly to the first support plate 91, the second support plate 92 is 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 the second support plate 92. That is, the second support plate 92 also corresponds to an example of a support member. Note that both the first support plate 91 and the second support plate 92 may be inclined with respect to the vertical direction.

  As described above, since the momentum of the water discharged from the discharge port 7a becomes relatively weaker as it goes downstream, the second support plate 92 of the present embodiment has more water than the support of the space forming member 8. The size of the second opening 92 b is set larger than the second opening 91 b of the first support plate 91.

  Moreover, the 2nd division part 922 also has the partition part 9221 located above the space formation member 8, as it distinguishes and shows with a dashed-dotted line in Fig.8 (a). 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 dammed by the partition portion 9221 in particular. That is, at least the partition portion 9221 of the second partition portion 922 of the second support plate 92 corresponds to a partition member. In addition, the partition 9221 is formed larger than the partition 9121 of the first support plate 91 shown in FIG. This is because a large stone block just before the sand collecting pit 42 is used to prevent clogging of large stone blocks and other contaminants from the sand pump 51 (see FIGS. 1 and 2) arranged in the sand collecting pit 42. The intention is to reliably dam R. 2 and 3A, the partitioning portion 9121 of the first support plate 91 is the height of the upper end 41a of the inclined surface 41 (see FIG. 9A, FIG. 13C, etc.). 2 and FIG. 8A, the height position of the upper end 41a of the inclined surface 41 is provided even in the partitioning portion 9221 of the second support plate 92, as shown in FIGS. It is provided at a lower position. Here, when the flow of water is dammed in the transfer direction, there occurs a problem that the flow rate of the water increases at that portion and the sand is difficult to settle. For this reason, the height of the partition portions 9121 and 9221 is limited by these partition portions 9121 and 9221 so that the water flow is not blocked more than necessary.

  The downstream pond bottom 10b has a symmetrical configuration with the upstream pond bottom 10a described above as an example with the sand collecting pit 42 interposed therebetween. For this reason, the discharge port 7a in the downstream pond bottom part 10b is arrange | positioned in the edge part of the downstream of the downstream pond bottom part 10b, and water is discharged toward the upstream from the discharge port 7a. Thereby, the water discharge direction of the discharge port 7a, that is, the transfer direction is opposite to the upstream pond bottom 10a, and the sand moves in the space S2 in the space forming member 8 from the downstream side toward the upstream side. Collected in the sand collection pit 42. In addition, when a big contaminant flows into the sand basin 1, there is a high possibility of sinking to the upstream pond bottom 10a, and the downstream pond bottom 10b is larger than the interval C between the trough 3 and the space forming member 8. There is a low possibility that the stone block R and the like will flow in. In addition, even if a large stone block R or the like is sandwiched between the trough 3 and the space forming member 8 at the downstream pond bottom 10b, there is a flow of water from the upstream side toward the downstream side, The lump R or the like is difficult to move to the sand collecting pit 42. For these reasons, in the downstream pond bottom portion 10b, it is possible to omit the partition portion 9121 of the first support plate 91 shown in FIG. 3A or to reduce the area, and FIG. A mode in which the partitioning portion 9221 of the second support plate 92 shown in FIG.

  Furthermore, as shown in FIGS. 1, 2, and 8 (b), in the present embodiment, the partition portions 9121, 9221 are used as a device for suppressing the clogging of the sand pump 51 with contaminants such as large stone blocks. In addition, a cap member 6 is also provided. The shade member 6 will be described with reference to FIG.

  FIG. 9 (a) is an enlarged view of the sand collecting pit 42 of the sand basin 1 shown in FIG. 1 and a G portion surrounding the periphery thereof, and FIG. 9 (b) is an enlarged view of FIG. 9 (a). FIG. 4C is a cross-sectional view taken along the line II of FIG. 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.

  As shown in FIG. 9A to FIG. 9C, the cap member 6 is provided with a sand pump in a state where a flow path leading from the trough 3 and the space forming member 8 to the sand pump 51 of the sand collecting pit 42 is secured. 51 is enclosed. That is, the shade member 6 corresponds to an example of a surrounding member. As the surrounding member, the portion other than the flow path leading from the trough 3 and the space forming member 8 to the sand pump 51 of the sand collecting pit 42 may be closed and the sand pump 51 may be surrounded. The shade member 6 surrounds the sand 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 side and the downstream side of the ceiling portion 61, A first side wall 63 constituting the side wall on which the sand pipe 52 is located and a second side wall 64 constituting the other side wall are provided. The shade member 6 of the present embodiment surrounds the sand pump 51 and covers the sand pump 51 with the ceiling 61.

  The ceiling portion 61 has a substantially rectangular shape, and avoids the projecting portions 611 and 611 projecting on the upstream side and the downstream side, the through hole 61a provided in the approximate center in plan view, and the sand raising pipe 52, respectively. The substantially U-shaped notch 61b is provided. Further, the shade member 6 is attached to the sand pump 51 by a fastening member (not shown) in a state where the sand pump 51 passes through the through hole 61 a of the ceiling 61. Accordingly, as described above, the cap member 6 can also be lifted from the sand collecting pit 42 by lifting the sand pump 51 from the sand collecting pit 42.

  The partition wall 62 is suspended 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. 9A and 9B, the partition wall 62 includes a second support plate upstream of the second support plate 92 in the upstream pond bottom 10a and a second support plate in the downstream pond bottom 10b. It is located downstream from 92. That is, the partition wall 62 is positioned upstream of the second support plate 92 in the transfer direction. Thereby, as described above, the stone block R (see FIG. 8A, etc.) that has moved toward the sand collecting pit 42 with the transfer of sand by the water discharged from the discharge port 7a is first divided into partition walls. It is blocked by 62. If there is a stone block R that has passed through the partition wall 62, it is finally dammed up by the second support plate 92. Note that the partition wall 62 may be positioned downstream of the second support plate 92 in the transfer direction. However, in this aspect, when a stone block or the like is sandwiched 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 pump 51 is driven. In some cases, a lump 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 positioned upstream of the second support plate 92 in the transfer direction, the partition wall 62 and the second support are supported even if the partition wall 62 moves. A lump or the like sandwiched between the plates 92 does not fall into the sand collecting pit 42.

  Further, since the lower end portion of the partition wall 62 is cut out in an arc shape, the trough 3 and the space formation are formed between the partition wall 62 and the space forming member 8 as shown in FIG. An interval of approximately the same size as the interval with the member 8 is provided.

  The first side wall part 63 is a pair of rectangular wall parts 631 and 631 provided at intervals in the transfer direction, and a position between the rectangular wall parts 631 and 631 and a notch part of the ceiling part 61 It has a U-shaped wall portion 632 depending from 61b. When the sand pump 51 is removed from the sand pumping pipe 52 and the cap member 6 is taken out from the sand collecting pit 42 together with the sand pump 51, the U-shaped wall 632 contacts the sand pumping pipe 52. The flow path leading from the first side wall 63 side to the suction port of the sand pump 51 is blocked to some extent. The second side wall portion 64 is a single rectangular wall portion. The first side wall part 63 and the second side wall part 64 are arranged with a gap with respect to the bottom of the sand collecting pit 42. By setting this gap, the lower limit value of the size of the contaminant that prevents the sand pump 51 from being reached can be adjusted.

  The shade member 6 can prevent contaminants that cause problems in the sand pump 51 from reaching the sand pump 51. The ceiling portion 61 is not always necessary, but if the sand pump 51 is surrounded and covered by the ceiling portion 61 as in the present embodiment, the ceiling portion 61 sinks from above as well as contaminants flowing from the side. It can also block the contaminated material.

  Next, a modified example of the above-described embodiment will be described. In the description after this, the description will focus on the differences from the above-described embodiment, and the components having the same names as the names of the components described so far will be described with reference numerals used so far. A duplicate description may be omitted.

  FIG. 10 is a diagram illustrating 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 FIG. 3A and FIG. 8A, the partition part 9121 that is a part of the first support plate 91 and the partition part 9221 that is a part of the second support plate 92 are provided. Although it has a function as a partition member, it may be configured as a partition member that does not have a function of supporting the space forming member 8. In FIG. 10, the modification which provided the partition member which does not have a function which supports the space formation member 8 is shown.

  The partition member 93 shown in FIG. 10A has a lower end portion 931 provided in a substantially linear shape in the width direction and 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. It is provided in a state of being connected to the upper end of the space forming member 8 and the upper edge 3 b of the trough 3. Thereby, the partition member 93 is provided in the 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 approximately 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. Yes. In addition, when changing the height position of the space formation member 8 in the trough 3, as shown by a dashed-two dotted line in Fig.10 (a), let the lower end part of the partition member 93 be the upper end of the space formation member 8. FIG. What is necessary is just to incline and provide so that it may connect with the upper edge 3b of the trough 3. FIG. 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 that are formed in an upwardly convex arc shape. The space forming member 8 is disposed at an equal distance from any upper edge 3b of the groove defining surface 3a in the direction intersecting the extending direction of the trough 3, and between the space forming member 8 and the lower end portion 941. Has an interval substantially the same as the minimum interval C between the upper edge 3 b of the trough 3 and the space forming member 8. 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, it can be stably dammed. In particular, the sand basin in a mode in which the dust remover 2 is provided on the downstream side and a large stone block or the like easily flows. Useful for.

  The partition member 95 shown in FIG. 10C is used in a mode in which the space forming member 8 is disposed not at the center in the width direction in the trough 3 but at a position biased in the width direction. The space forming member 8 shown in FIG. 10C is arranged closer to the first upper edge 3b1 shown on the right side in the drawing than the second upper edge 3b2 shown on the left side in the drawing on the groove defining surface 3a. . Thereby, the minimum interval C2 between the second upper edge 3b2 and the space forming member 8 is larger than the minimum interval C1 between the first upper edge 3b1 and the space forming member 8. The partition member 95 has a lower end portion 951 and an upper end portion 952 that are formed in an upwardly convex arc shape, and a minimum interval between the space forming member 8 and the lower end portion 951 is the second upper edge 3b2 and the space forming member 8. Is set to be approximately the same as the minimum interval C2. Here, as shown in FIG. 10 (c), the space forming member 8 has either one upper edge (in this case, shown on the left side of the figure) in the direction intersecting the extending direction of the trough 3 of the groove defining surface 3a. In a mode of being arranged closer to the other upper edge (here, the first upper edge 3b1 shown on the right side of the drawing) than the second upper edge 3b2), the minimum of the first upper edge 3b1 and the space forming member 8 The minimum interval C2 between the second upper edge 3b2 and the space forming member 8 is larger than the interval C1. In this embodiment, even if the partition member 95 dams a stone block R or the like that is 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 block R The lump R or the like may enter from 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 damped will vary. In the modification shown in FIG. 10C, the lower end portion 951 of the partition member 95 is provided above the upper end of the space forming member 8 by the minimum distance C2 between the second upper edge 3b2 and the space forming member 8. Thus, the lower limit value of the size of the stone block R or the like to be dammed can be made constant.

  FIG. 11 is a view showing a modification of the space forming member 8 shown in FIG.

  The protrusion 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 sand that falls from the suction port 8b before reaching the sand collecting pit 42.

  FIGS. 12A and 12B are views showing a state corresponding to FIGS. 9C and 9D with respect to the first modification of the shade member 6 shown in FIG.

  As shown in FIGS. 12A and 12B, the shade member 6 ′ of the first modified example has rectangular partitions 62 ′ and 62 ′ hanging from the projecting portions 611 and 611 of the ceiling portion 61, respectively. The rectangular transfer direction side partition walls 621 and 621 hanging from the ceiling portion 61 are provided on both sides in the width direction across the partition walls 62 ′ and 62 ′. In the shade member 6 ′ of the first modified example, the contaminant flowing into the sand collecting pit 42 can be dammed by the transfer direction side partition wall 621.

  FIG. 13 is a diagram illustrating a state corresponding to FIG. 9 for a second modification of the shade member 6 illustrated in FIG. 9 and a modification of the second support plate 92 illustrated in FIG. 9. 13B is a cross-sectional view taken along line JJ in FIG. 13A, and FIG. 13C is a cross-sectional view taken along line KK in FIG.

  As shown in FIGS. 13A to 13D, the shade member 6 "of the second modified example 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 65 a is formed in the upstream side wall 65, and an opening 66 a is similarly formed in the downstream side wall 66.

  The modified second support plate 92 ′ has a bent portion 923 that is located above the space forming member 8 and bent toward the sand collecting pit 42. The bent portion 923 enters the shade member 6 "from the openings 65a and 66a of the shade member 6". Thereby, 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 set as the cap member. 6 ″ downstream side wall portion 66 and the bent portion 923 of the second support plate 92 ′ are blocked. It should be noted that the bent portion 923 only needs to be slightly inserted into the shade member 6 '' at the tip 923a. However, in this modification, the tip 923a of the bent portion 923 is sufficiently within the shade member 6 '' for safety. It is set to the length that enters. Further, the front end 923a of the bent portion is not inserted into the shade member 6 '' but outside the shade member 6 '' and opposed to the upstream side wall portion 65 and the downstream side wall portion 66 with a predetermined gap. Also good. However, the sand collecting pit 42 is caused by the displacement of the upstream side wall 65 or the like caused by the vibration of the stone lump or the like fitted between the tip 923a of the bent portion and the upstream side wall 65 or the like. May fall. Therefore, a mode in which the leading end 923a of the bent portion is inserted into the shade member 6 '' is more preferable.

  FIG. 14 shows an aspect in which the shade member 6 ″ of the second modification example is replaced with the shade member 6 ″ of the second modification example in the shade member 6 ″ of the second modification example shown in FIG. It is a figure which shows a mode corresponding to Fig.13 (a)-(c). FIG. 14B is a cross-sectional view taken along line LL in FIG. 14A, and FIG. 14C is a cross-sectional view taken along line MM in FIG.

  As shown in FIGS. 14A to 14C, the shade member 60 of the third modified example has a notch 61 b ′ formed in the ceiling 61 ′ so that the notch 61 b ′ is largely cut away from the sand pump 51. In addition, a U-shaped wall portion 632 ′ hangs down from the notch 61b ′. As shown in FIGS. 14 (a) and (b), the cap member 60 is separated from the sand pump 51, and as shown in FIGS. 14 (a) to (c), one end is gathered. Four support pieces 67 fixed to the side wall 421 of the sand pit 42 are provided, and the other ends of these support pieces 67 are fixed to the ceiling portion 61 ′. Accordingly, as shown in FIG. 14B and FIG. 14C, the shade member 60 is disposed with a gap with respect to the bottom of the sand collecting pit 42. In the embodiment shown in FIG. 14, the sand pump 51 is pulled up from the sand collecting pit 42 independently.

  Up to this point, the sand sink pond 1 in which one trough 3 and one space forming member 8 are provided in each of the upstream pond bottom 10a and the downstream pond bottom 10b has been described as an example. Here, when the upstream pond bottom 10a and the downstream pond bottom 10b are long in the transfer direction, the plurality of troughs 3 are connected in the transfer direction, and the plurality of space forming members 8 are also connected in the transfer direction. It is good also as an aspect to do. 1 and FIG. 2, the sand collecting pit 42 is not provided in the form of the sand collecting pit 42 between the upstream pond bottom 10a and the downstream pond bottom 10b. The same applies when the length of the pond bottom 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 an aspect 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. It is NN sectional drawing of a figure (a). In FIG. 4A, the left-right direction is the width direction, and in FIG. 4B, the right direction is the transfer direction. That is, in FIG. 5B, 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 are supported by the third support plate 96 at the ends on the downstream side in the transfer direction. 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 are supported by the third support plate 96 at the ends on the upstream side in the transfer direction. . Note that the ends of the trough 3 and the space forming member 8 on the downstream side in the transfer direction are supported by a second support plate 92 shown in FIG.

  As shown in FIG. 15B, by fixing the third support plates 96 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. Thereby, 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 through 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 similar to the second support plate 92 shown in FIG. 8 (a), in the space S2 of the space forming member 8 in the space S1 in the trough 3. A first opening 96a is formed in the region, and a second opening 96b is formed in a donut shape of about ½ in the lower portion. Thereby, portions of the space S1 in the trough 3 other than the first opening 96a and the second opening 96b are also partitioned by the third support plate 96 in the transport direction.

  FIG. 16 is a view showing a modified example of the discharge port in which the shape and position are changed with respect to the discharge port 7a shown in FIG. 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 member are shown.

  The discharge port 70a of the first modification shown by a solid line in FIG. 16 is deformed in an arc shape so that both end portions in the width direction are directed downward. By carrying out like this, the center part of the width direction in the discharge port 70a will move away from the suction port 8b of the space formation member 8, and the suction port 8b will function as a discharge port which discharges the sand inhaled in space S2. The action which suppresses can be expected.

  In FIG. 16, the discharge port 70 a ′ of the second modified example indicated by the one-dot chain line changes the position in the height direction until it abuts on the inner peripheral surface 8 e of the space forming member 8. Further, the discharge port 70a '' of the third modified example shown by a two-dot chain line in FIG. 16 is obtained by reducing the opening length W in the width direction until it becomes slightly larger than the opening length L in the width direction of the suction port 8b. Thus, the position in the height direction is changed until it comes into contact with the inner peripheral surface 8e of the space forming member 8. By doing so, the discharge port 70a '' of the third modification can be expanded in the range in which the position in the height direction is changed as compared to the discharge port 70a 'of the second modification.

  Like these modified examples, the discharge port has a flat shape whose height direction is crushed and expanded 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 arrangement position can be changed within the range of the requirement that it is long.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope described in the claims. For example, the first support plate 91, the second support plate 92, the third support plate 96, the partition members 93, 94, 95, and the shade member 6 may be formed with a slit in a part or all of them, You may employ | adopt the aspect which suppresses inhibiting the flow of the water in the settling basin 1 by these 1st partition members 93 grade | etc., By comprising by the saw-like member etc. which connected the bar.

  In addition, even if it is a structural requirement contained only in description of embodiment and each modification demonstrated above, you may apply the structural requirement to embodiment and another modification.

DESCRIPTION OF SYMBOLS 1 Sand basin 2 Dust remover 3 Trough 3a Groove demarcation surface 41 Inclined surface 42 Sand collection pit 51 Sand pump 6 Shaft member 7 Discharge member 7a Discharge port 8 Space formation member 8b Suction port 91 First support plate 92 , 94, 95 Partition member S1, S2 space

Claims (3)

A solid-liquid separation system that settles contaminants contained in the received liquid to the bottom, transfers the settled contaminants to the accumulation unit, and removes the contaminants from the accumulation unit,
A groove extending toward the accumulation portion at the bottom and opening upward;
A space forming member provided along the groove, forming a space where the upper end portion is closed, and provided with a suction port spaced from the bottom of the groove below the upper end portion;
A discharge port for discharging the fluid in the space toward the downstream side in the transfer direction of the contaminants,
The suction port functions as an opening that opens in the groove and sucks the contaminants accumulated in the groove into the space by discharging fluid from the discharge port.
The space forming member functions as a path for the contaminants sucked into the space to move toward the accumulation portion by discharging fluid from the discharge port, and the end on the accumulation portion side A solid-liquid separation system, characterized in that the groove protrudes beyond the end of the groove on the accumulation part side.   2. The solid-liquid separation system according to claim 1, further comprising a support member that is provided at an end of the groove on the accumulation portion side, through which the space forming member penetrates, and supports the space forming member.   2. A partition member provided at an end portion of the groove on the accumulation portion side, through which the space forming member penetrates, and partitions the bottom portion in a direction intersecting with an extending direction of the groove. The solid-liquid separation system described.