Sedimentation promotion device

Abstract

To provide a sedimentation promotion device capable of reliably and inexpensively suppressing damage to components caused by sloshing.SOLUTION: A sedimentation promotion device 2 comprises: an inclined plate holding assembly 3 that holds a plurality of sedimentation inclined plates 5 in parallel with each other; a suspension structure 8 for supporting the inclined plate holding assembly 3; and a suspension tool 7 for suspending the inclined plate holding assembly 3 from the suspension structure. The suspension tool 7 includes a first connector 12 and a second connector 14 suspended from the first connector 12 and having a ring shape. The first connector 12 suspends the second connector 14 so as to allow swinging in a horizontal direction, and the second connector 14 suspends the inclined plate holding assembly 3 such that the inclined plate holding assembly 3 can swing in a horizontal direction perpendicular to the swinging direction of the second connector 14 connected to the first connector 12.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a settling promotion device for efficiently settling sediment contained in water to be treated in a settling tank, and more particularly to a settling promotion device with measures taken to prevent sloshing. [Background technology]

[0002] Sedimentation promotion devices are used in sedimentation basins to efficiently separate sediments (impurities) from treated water discharged from water treatment facilities such as water purification plants. The sedimentation promotion device includes, for example, a plurality of inclined plates (hereinafter referred to as "settling inclined plates") arranged at an angle to the horizontal, a support frame for arranging the inclined plates in multiple vertical rows and multiple horizontal rows, and a suspender for suspending the support frame above the sedimentation basin.

[0003] Such settling promotion devices generally have a simple support structure in which a support frame is simply suspended from the sedimentation basin structure via a suspending device. Therefore, if sloshing (vibration) of the water being treated occurs in the sedimentation basin due to an earthquake, the settling promotion device may also sway relative to the sedimentation basin. The sloshing of the settling promotion device may cause malfunctions such as damage or deformation of the support frame, settling inclined plate, and suspending device, or the settling inclined plate falling off the support frame. Therefore, numerous countermeasures against sloshing have been proposed, such as those described in Patent Documents 1 to 3.

[0004] In the sloshing suppression structure described in Patent Document 1, a shock absorber such as a coil spring member or a rubber-like elastic member is interposed between the frame that holds the inclined settling plate and the side wall of the settling tank. In the sloshing suppression structure described in Patent Document 2, a damper is interposed between a steel frame placed in the settling tank and the hook bolt that suspends the inclined plate unit. In the inclined plate settling system described in Patent Document 3, a wave breaker placed near the water surface of the settling tank suppresses the growth of waves caused by sloshing of the water to be treated. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-159199 [Patent Document 2] Patent No. 7075071 [Patent Document 3] Patent Publication No. 2021-171741 Summary of the Invention [Problem to be solved by the invention]

[0006] The sloshing suppression structure described in Patent Document 1 is susceptible to loss of its function as a shock absorber due to fatigue failure of the coil spring members and deterioration of the rubber-like elastic members. Furthermore, given that the shock absorber is constantly submerged in the water being treated in the sedimentation basin, it is expected to deteriorate at a faster rate than if the shock absorber were installed above ground. Furthermore, even if the shock absorber can prevent the frame from colliding with the side wall of the sedimentation basin, it cannot fully suppress the displacement of the frame itself, and the load may be transmitted to the hanging devices, such as the hanging hooks and hanging bolts, that suspend the frame, potentially leading to fatigue failure of the hanging devices.

[0007] In the sloshing suppression structure described in Patent Document 2, if the dimensions of the inclined plate unit increase in the width direction of the sedimentation tank, dampers must be interposed between multiple hook bolts, which increases the cost of sloshing prevention measures, making them uneconomical and complicated to install.

[0008] The inclined plate sedimentation system described in Patent Document 3 can suppress sloshing on the water surface of the sedimentation tank, but it cannot prevent displacement of the support frame that holds the inclined plate itself due to earthquakes, and there remains a concern that the support frame may collide with the side wall of the sedimentation tank and be damaged.

[0009] Therefore, an object of the present invention is to provide a settling promotion device that can inexpensively and reliably prevent damage to components due to sloshing. [Means for solving the problem]

[0010] In one aspect, a sedimentation promotion device is provided, comprising an inclined plate holding assembly that holds multiple sedimentation inclined plates parallel to each other, a suspension structure for supporting the inclined plate holding assembly, and a hanging device for suspending the inclined plate holding assembly from the suspension structure, wherein the hanging device includes a first connector and a second connector suspended from the first connector and having a ring shape, wherein the first connector suspends the second connector so that it can swing horizontally, and the second connector suspends the inclined plate holding assembly so that it can swing horizontally perpendicular to the swing direction of the second connector connected to the first connector.

[0011] In one embodiment, the second connector has an oval ring shape. In one embodiment, the second connector has an opening formed in a part of its ring shape and a gate that can close the opening. In one embodiment, the first connector is a connecting hook, and the connecting hook has a gate that can close an opening of the connecting hook. [Effects of the Invention]

[0012] In these embodiments, the inclined plate support assembly can swing freely in both the length and width directions of the basin. As a result, when sloshing of the water to be treated occurs, the inclined plate support assembly can be freely displaced relative to the sedimentation basin, reducing the load on the stationary components of the settling promotion device. Therefore, by simply adopting a simple and inexpensive configuration in which the inclined plate assembly is suspended by two connectors with different swing directions, damage to the components of the settling promotion device due to sloshing of the water to be treated can be effectively prevented. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a plan view schematically showing a settling basin in which a settling promotion device according to one embodiment is disposed. [Figure 2] FIG. 2 is a schematic front view of the sedimentation promotion device shown in FIG. 1, viewed from the direction of flow of the water to be treated in the settling tank. [Figure 3] FIG. 3 is a schematic side view of the sedimentation promotion device shown in FIG. 1, as viewed from the side wall of the settling tank along the direction of flow of the water to be treated. [Figure 4] FIG. 4 is a front view of a support frame according to one embodiment. [Figure 5] FIG. 5 is a schematic diagram showing a settling inclined plate according to one embodiment. [Figure 6] FIG. 6 is a schematic front view of a hanging tool according to one embodiment, viewed from the direction in which the water to be treated flows in the settling basin. [Figure 7] FIG. 7 is a schematic side view of the hanging tool shown in FIG. 6, as viewed from the side wall of the sedimentation tank along the flow direction of the water to be treated. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically illustrating a sedimentation basin in which a settling promotion device according to one embodiment is disposed. FIG. 2 is a schematic front view of the settling promotion device shown in FIG. 1 as viewed from the flow direction of the water to be treated in the settling basin, and FIG. 3 is a schematic side view of the settling promotion device shown in FIG. 1 as viewed from a side wall of the settling basin along the flow direction of the water to be treated. In the embodiments described below, as shown in FIG. 1, a horizontal direction D1 parallel to the flow direction F of the water to be treated may be referred to as the "pond length direction D1." A horizontal direction D2 perpendicular to the pond length direction D1 may be referred to as the "pond width direction D2." The pond length direction D1 is perpendicular to the vertical direction and parallel to the flow direction F of the water to be treated. The pond width direction D2 is perpendicular to the vertical direction and the flow direction F of the water to be treated.

[0015] The settling tank 1 shown in Fig. 1 is a facility for settling sediments (impurities) contained in the water to be treated, and has a generally rectangular shape in plan view. At least one settling promotion device 2 (four in Fig. 1) is disposed in the settling tank 1 to efficiently settle the sediments.

[0016] 2 and 3, the settling promotion device 2 includes a plurality of inclined settling plates 5 for promoting the settling of sediment, a plurality of (three in FIG. 3) support frames 6 for holding the plurality of inclined settling plates 5, a plurality of suspenders 7 for suspending the support frames 6, and a suspension structure 8 for suspending the suspenders 7. Hereinafter, a unit formed by the plurality of support frames 6 and the plurality of inclined settling plates 5 held by these support frames 6 will be referred to as an "inclined plate holding assembly 3."

[0017] As shown in FIG. 1 , the suspension structure 8 spans the sedimentation basin 1 in the width direction D2. The multiple inclined sedimentation plates 5 and support frame 6, i.e., the inclined plate support assembly 3, are supported on the ground or structure where the sedimentation basin 1 is formed via a suspender 7 and the suspension structure 8. Examples of the suspension structure 8 include precast concrete girders and steel girders. Although not shown, the suspension structure 8 may also be composed of a steel girder connected to the suspender 7 and extending in the width direction D2, a pair of rails laid on the ground or structure where the sedimentation basin 1 is formed and extending parallel to the length direction F, and one or more pairs of wheels attached to the steel girders and capable of running on the pair of rails. In this configuration, the suspension structure 8 can be moved in the length direction D1, and the movement of the suspension structure 8 can move the inclined plate support assembly 3 in the length direction D1.

[0018] FIG. 4 is a front view of a support frame according to one embodiment. The support frame 6 shown in FIG. 4 has a substantially rectangular shape and is composed of a frame main body 6a constituting an outer frame and support members 6b and 6c for supporting the inclined submersion plate 5 at an angle. The frame main body 6a may be formed, for example, by welding four plate-like members together, or by fastening the four plate-like members together using bolts or the like. In one embodiment, the frame main body 6a may be formed by bending a single plate-like member. The support members 6b and 6c are, for example, wires stretched in a lattice pattern on the frame main body 6a. The support member 6b extends vertically, and the support member 6c extends horizontally. The support members 6b and 6c are stretched at equal intervals on the frame main body 6a to form a lattice of the same shape. This configuration allows parallel inclined submersion plates 5 to be arranged in multiple rows in the vertical direction.

[0019] As shown in FIG. 3, in this embodiment, the inclined plate holding assembly 3 includes three support frames 6 arranged at equal intervals in the pond length direction D1. In one embodiment, the inclined plate holding assembly 3 may include two support frames 6 arranged at equal intervals in the pond length direction D1, or may include three or more support frames 6. As shown in FIG. 2, the sedimentation inclined plate 5 is inserted obliquely into each lattice formed by the support members 6b and 6c of the support frame 6. When multiple sedimentation inclined plates 5 are inserted into each lattice of the support frame 6, each sedimentation inclined plate 5 is supported obliquely on the diagonal of each lattice formed by the support members 6b and 6c of the support frame 6. With this configuration, the multiple sedimentation inclined plates 5 are arranged parallel to each other. For ease of explanation, the three support frames 6 may be referred to as the first support frame 6A, the second support frame 6B, and the third support frame 6C along the flow direction F of the water to be treated (see FIG. 3).

[0020] Figure 5 is a schematic diagram showing a sedimentation inclined plate according to one embodiment. The sedimentation inclined plate 5 shown in Figure 5 has three notches 5a at its bottom. Each notch 5a is formed in the sedimentation inclined plate 5 so that the intersections of the support members 6b and 6c fit into the notches when the sedimentation inclined plate 5 is inserted into each grid of the support frame 6. By fitting each notch 5a into the support members 6b and 6c, the sedimentation inclined plate 5 is positioned relative to the multiple support frames 6 (i.e., 6A, 6B, and 6C) and the sedimentation inclined plate 5 is prevented from falling off the support frame 6.

[0021] A sedimentation promotion device 2 having such a configuration is placed in a sedimentation tank 1, and the sediment contained in the treated water flowing into the sedimentation tank 1 is promoted to settle due to the increased settling area created by the multiple settling inclined plates 5.

[0022] FIG. 6 is a schematic front view of a hanging device according to one embodiment, viewed from the direction of flow of the untreated water in the sedimentation basin. FIG. 7 is a schematic side view of the hanging device shown in FIG. 6, viewed from a side wall along the direction of flow of the untreated water in the sedimentation basin. In this embodiment, the hanging device 7 is composed of a first connector 12, a second connector 14, and a connecting bolt 11, and the inclined plate holding assembly 3 is connected to a suspension structure 8 via the hanging device 7. The upper end of the connecting bolt 11 is firmly fixed to the suspension structure 8 and is a stationary member that is only allowed to move to a certain extent in the pond length direction D1 and the pond width direction D2. The first connector 12 is also a stationary member that is fixed to the lower end of the connecting bolt 11 and is only allowed to move to a certain extent in the pond length direction D1 and the pond width direction D2.

[0023] The first connector 12 is configured to allow the second connector 14 to swing horizontally relative to the first connector 12. Specifically, the first connector 12 is a member having an inner edge that allows the second connector 14 to swing relative to the first connector 12. The first connector 12 shown in FIGS. 6 and 7 is a connecting hook having an opening 12a, and the second connector 14 is hung from the inner edge of the hook of the first connector 12 through the opening 12a. The second connector 14 can swing or be displaced along the inner edge of the hook of the first connector 12.

[0024] As shown in FIG. 7, the second connector 14 is a ring-shaped connector, and the support frame 6 (upper part of the frame) of the inclined plate holding assembly 3 can be suspended from the inner edge of its lower part. The second connector 14 suspends the inclined plate holding assembly 3 so that the inclined plate holding assembly 3 can swing horizontally, perpendicular to the swing direction of the second connector connected to the first connector 12. In this embodiment, the opening 12a of the first connector 12 faces the pond width direction D2 (see FIG. 6), and the second connector 14 suspended from the inner edge of the hook of the first connector 12 can swing in the pond width direction D2 along the inner edge of the hook of the first connector 12 (see FIG. 7). Meanwhile, the inclined plate holding assembly 3 suspended from the lower part of the second connector 14 can swing in the pond length direction D1, which is perpendicular to the pond width direction D2, along the inner edge of the ring-shaped second connector 14.

[0025] With this configuration, the second connector 14 and the inclined plate holding assembly 3 suspended from the first connector 12 can swing in the pond width direction D2, and the inclined plate holding assembly 3 suspended from the second connector 14 can swing in the pond length direction D1. Therefore, when sloshing of the water to be treated occurs in the settling basin 1, the displacement of the inclined plate holding assembly 3 caused by a force component parallel to the pond length direction D1 of the water to be treated is alleviated by the swinging motion between the second connector 14 and the inclined plate holding assembly 3. Furthermore, the displacement of the inclined plate holding assembly 3 caused by a force component parallel to the pond width direction D2 of the water to be treated is alleviated by the swinging motion between the first connector 12 and the second connector 14. As a result, excessive load due to sloshing of the water to be treated is prevented from being applied not only to the stationary structures (e.g., the connecting bolts 11 and the suspension structure 8) to which the settling assembly 3 is connected, but also to the inclined plate holding assembly 3 itself. Therefore, a simple and inexpensive configuration in which the inclined plate holding assembly 3 is suspended from the suspension structure 8 via the first connector 12 and the second connector 14, whose swing directions differ by 90 degrees horizontally, can prevent damage to the components of the sedimentation promotion device 2 due to sloshing.

[0026] As shown in FIGS. 6 and 7 , the first connector 12 preferably has a first gate 12b that can close the opening 12a. The first gate 12b normally closes the opening 12a under a load applied by an elastic member such as a spring. In one embodiment, the first gate 12b may close the opening 12a by magnetic force. When engaging the second connector 14 with the first connector 12, the second connector 14 is pressed against the first gate 12b with a force greater than the load applied to the first gate 12b, causing the first gate 12b to rotate so that the second connector 14 can pass through the opening 12a of the first connector 12 (see the dashed-dotted line in FIG. 6 ). The first gate 12b prevents the second connector 14 from falling off the first connector 12 and simultaneously facilitates engagement of the second connector 14 with the first connector 12.

[0027] The second connector 14 shown in FIGS. 6 and 7 has an oval shape like a carabiner. Similar to the first connector 12, the second connector 14 preferably has a second gate 14b that can close its opening 14a. The second gate 14b normally closes the opening 14a when a load is applied by an elastic member such as a spring. In one embodiment, the second gate 14b may close the opening 14a by magnetic force. When engaging the first connector 12 or the ramp plate holding assembly 3 with the second connector 14, the first connector 12 or the support frame 6 of the first connector 12 or the ramp plate holding assembly 3 is pressed against the second gate 14b with a force greater than the load applied to the second gate 14b, causing the second gate 14b to rotate so that the support frame 6 of the first connector 12 or the ramp plate holding assembly 3 can pass through the opening 14a of the second connector 14 (see the dashed line in FIG. 7 ). The second gate 14b prevents the first connector 12 and the inclined plate holding assembly 3 from falling off the second connector 14, while at the same time facilitating engagement of the first connector 12 and the inclined plate holding assembly 3 with the second connector 14.

[0028] The configuration of the second connector 14 is not limited to the example shown in Figures 6 and 7, as long as it can suspend the inclined plate holding assembly 3 so that it can swing in a horizontal direction perpendicular to the swing direction of the second connector connected to the first connector 12. For example, the second connector 14 may be a string-like member such as a rope, chain, or wire connected in a ring shape, or may be a D-shaped ring. When the second connector 14 is a string-like member, the second connector 14 has a fastener capable of connecting both ends of the string-like member.

[0029] The above-described embodiments have been described for the purpose of enabling a person of ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments would naturally be possible for a person skilled in the art, and the technical concept of the present invention may also be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is to be interpreted in the broadest scope in accordance with the technical concept defined by the claims. [Explanation of symbols]

[0030] 1 Sedimentation tank 2. Sedimentation accelerator 3 Inclined Plate Holding Assembly 5 Inclined plate 6 Support Frame 7 Hanging device 8 Suspension structure 11 Connecting bolt 12 First connector (connecting hook) 14 Second connector (ring-shaped connector)

Claims

1. a tilt plate support assembly for supporting the plurality of settling tilt plates parallel to one another; a suspension structure for supporting the ramp support assembly; a hanger for suspending the ramp plate retention assembly from the suspension structure; The hanging device includes a first connector and a second connector that is hung from the first connector and has a ring shape, The first connector suspends the second connector so as to be swingable in a horizontal direction, A sinking promotion device in which the second connector suspends the inclined plate holding assembly so that the inclined plate holding assembly can swing in a horizontal direction perpendicular to the swing direction of the second connector connected to the first connector.

2. The settling promotion device of claim 1 , wherein the second connector has an elliptical ring shape.

3. The second connector is an opening formed in a part of the ring shape; The settling promotion device according to claim 1 , further comprising: a gate capable of closing the opening.

4. The first connector is a connecting hook, The settling promotion device according to claim 1 , wherein the connecting hook has a gate that can close the opening of the connecting hook.

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