Settling acceleration device

Abstract

Provided is a sedimentation promoting device capable of inexpensively and surely suppressing damage to components due to sloshing. 【Solution means】The sedimentation promoting device 2 includes an inclined plate holding assembly 3 that holds a plurality of sedimentation inclined plates 5 parallel to 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 connecting tool 12 and a second connecting tool 14 that is suspended from the first connecting tool 12 and has a ring shape. The first connecting tool 12 suspends the second connecting tool 14 so as to be swingable in the horizontal direction, and the second connecting tool 14 suspends the inclined plate holding assembly 3 so as to be swingable in a horizontal direction perpendicular to the swinging direction of the second connecting tool 14 to which the inclined plate holding assembly 3 is connected to the first connecting tool 12.

Description

Technical Field

[0001] The present invention relates to a sedimentation promoting device for efficiently sedimenting sediments contained in water to be treated in a sedimentation basin, and more particularly to a sedimentation promoting device with sloshing countermeasures.

Background Art

[0002] In order to efficiently separate sediments (impurities) from water to be treated discharged from water treatment facilities such as water purification plants, a sedimentation promoting device disposed in a sedimentation basin is used. The sedimentation promoting device includes, for example, a plurality of inclined plates (hereinafter referred to as "sedimentation inclined plates") disposed obliquely with respect to the horizontal direction, a support frame for arranging the sedimentation inclined plates in a plurality of stages in the vertical direction and a plurality of rows in the horizontal direction, and a suspension tool for suspending the support frame in the sedimentation basin.

[0003] Such a sedimentation promoting device generally has a simple support structure in which the support frame is suspended from the structure of the sedimentation basin via a suspension tool. Therefore, when sloshing (oscillation) of the water to be treated caused by an earthquake occurs in the sedimentation basin, the sedimentation promoting device may also oscillate with respect to the sedimentation basin. The oscillation of the sedimentation promoting device may lead to problems such as damage or deformation of components of the sedimentation promoting device such as the support frame, the sedimentation inclined plates, and the suspension tool, or detachment of the sedimentation inclined plates from the support frame. Therefore, many sloshing countermeasures as described in Patent Documents 1 to 3 have been proposed.

[0004] In the sloshing suppression structure described in Patent Document 1, a buffer device such as a coil spring member or a rubber-like elastic member is interposed between the frame holding the sedimentation inclined plates and the side wall of the sedimentation basin. In the sloshing suppression structure described in Patent Document 2, a damper is interposed between the steel gantry disposed in the sedimentation basin and the hook bolt for suspending the inclined plate unit. In the inclined plate sedimentation system described in Patent Document 3, the growth of the waves of the sloshing of the water to be treated is suppressed by a wave breaker disposed near the water surface of the sedimentation basin.

Prior Art Documents

Patent Document

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the sloshing suppression structure described in Patent Document 1, there is a concern that the function as a shock absorber may be lost due to fatigue failure of the coil spring member or deterioration of the rubber-like elastic member. Furthermore, considering that the shock absorber is constantly submerged in the water to be treated in the sedimentation basin, it is assumed that the shock absorber will deteriorate at a faster rate than when it is placed on the ground. Furthermore, even if the shock absorber can avoid the collision between the side wall of the sedimentation basin and the frame, the displacement of the frame itself cannot be completely suppressed, and the load is transmitted to the suspension tools such as the suspension hook and suspension bolt that suspend the frame, and there is a risk that the suspension tool will reach fatigue failure.

[0007] In the sloshing suppression structure described in Patent Document 2, when the dimensions of the inclined plate unit become large in the tank width direction of the sedimentation basin, it is necessary to interpose dampers between a plurality of hook bolts, and the cost required for sloshing countermeasures becomes high, lacking in economic efficiency, and the construction also becomes complicated.

[0008] In the inclined plate sedimentation system described in Patent Document 3, although the sloshing of the water surface of the sedimentation basin can be suppressed, the displacement of the support frame itself that holds the inclined plate due to an earthquake cannot be prevented, and there remains a concern that the support frame will collide with the side wall of the sedimentation basin and be damaged.

[0009] Therefore, an object of the present invention is to provide a sedimentation promotion device that can reliably and inexpensively suppress damage to components due to sloshing.

Means for Solving the Problem

[0010] In one aspect, there is provided a sedimentation acceleration device including an inclined plate holding assembly that holds a plurality of sedimentation inclined plates in parallel with each other, a suspension structure for supporting the inclined plate holding assembly, and a suspension tool for suspending the inclined plate holding assembly from the suspension structure. The suspension tool includes a first connector and a second connector that is suspended from the first connector and has a ring shape. The first connector suspends the second connector so as to be swingable in the horizontal direction, and the second connector suspends the inclined plate holding assembly so as to be swingable in a horizontal direction perpendicular to the swinging direction of the second connector to which the inclined plate holding assembly is connected to the first connector.

[0011] In one aspect, the second connector has an elliptical ring shape. In one aspect, the second connector has an opening formed in a part of its ring shape and a gate capable of closing the opening. In one aspect, the first connector is a connecting hook, and the connecting hook has a gate capable of closing its opening.

Advantages of the Invention

[0012] According to these embodiments, the inclined plate holding assembly is swingable in both the tank length direction and the tank width direction. As a result, when sloshing of the water to be treated occurs, the inclined plate holding assembly can be freely displaced with respect to the sedimentation tank, and the load on the stationary components of the sedimentation acceleration device is reduced. Therefore, by simply adopting an inexpensive configuration in which the inclined plate assembly is suspended by two connectors having different swinging directions, breakage of the components of the sedimentation acceleration device caused by sloshing of the water to be treated can be effectively prevented.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

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

[0015] The sedimentation basin 1 shown in FIG. 1 is a facility for sedimenting sediments (impurities) contained in the water to be treated, and has a substantially rectangular shape in plan view. At least one (four in FIG. 1) sedimentation acceleration device 2 for efficiently sedimenting sediments is arranged in the sedimentation basin 1.

[0016] As shown in FIGS. 2 and 3, the sedimentation promoting device 2 includes a plurality of sedimentation inclined plates 5 for promoting the sedimentation of sediment, a plurality of (three in FIG. 3) support frames 6 for holding the plurality of sedimentation inclined plates 5, a plurality of suspension tools 7 for suspending the support frames 6, and a suspension structure 8 for suspending the suspension tools 7. Hereinafter, a unit composed of the plurality of support frames 6 and the plurality of sedimentation inclined plates 5 held by these support frames 6 is referred to as an "inclined plate holding assembly 3".

[0017] As shown in FIG. 1, the suspension structure 8 extends across the tank width direction D2 of the sedimentation tank 1, and the plurality of sedimentation inclined plates 5 and the support frames 6, that is, the inclined plate holding assembly 3, are supported by the ground or structure on which the sedimentation tank 1 is formed via the suspension tools 7 and the suspension structure 8. Examples of the suspension structure 8 include PC girders and steel girders. Although not shown, the suspension structure 8 may be composed of a steel girder connected to the suspension tool 7 and extending in the tank width direction D2, a pair of rails laid on the ground or structure on which the sedimentation tank 1 is formed and extending parallel to the tank length direction F, and a pair or a plurality of pairs of wheels provided on the steel girder and capable of traveling on the pair of rails. In this configuration, the suspension structure 8 can be moved in the tank length direction D1, and by moving the suspension structure 8, the inclined plate holding assembly 3 can be moved in the tank length direction D1.

[0018] FIG. 4 is a front view of a support frame according to an embodiment. The support frame 6 shown in FIG. 4 has a substantially rectangular shape and is composed of a frame body 6a that constitutes an outer frame and support members 6b and 6c for obliquely supporting the sedimentation inclined plates 5. The frame body 6a may be formed, for example, by welding four plate-like bodies or by fastening four plate-like bodies using bolts or the like. In one embodiment, the frame body 6a may be formed by bending one plate-like body. The support members 6b and 6c are, for example, wires stretched in a grid pattern on the frame body 6a. The support member 6b extends in the vertical direction, and the support member 6c extends in the horizontal direction. The support members 6b and 6c are stretched at equal intervals on the frame body 6a so as to form grids of the same shape. With such a configuration, a plurality of sedimentation inclined plates 5 parallel to each other can be arranged in a plurality of stages in the vertical direction.

[0019] As shown in FIG. 3, in the present 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 plates 5 are obliquely inserted into the grids formed by the support members 6b and 6c of the support frame 6. When a plurality of sedimentation inclined plates 5 are inserted into the grids of the support frame 6, each sedimentation inclined plate 5 is obliquely supported on the diagonal line of each grid formed by the support members 6b and 6c of the support frame 6. With such a configuration, the plurality of sedimentation inclined plates 5 are arranged to be parallel to each other. Hereinafter, for convenience of explanation, the three support frames 6 may be referred to as a first support frame 6A, a second support frame 6B, and a third support frame 6C along the flow direction F of the water to be treated (see FIG. 3).

[0020] FIG. 5 is a schematic diagram showing a sedimentation inclined plate according to an embodiment. The sedimentation inclined plate 5 shown in FIG. 5 has three notches 5a at its lower part. Each notch 5a is formed in the sedimentation inclined plate 5 so that when the sedimentation inclined plate 5 is inserted into each grid of the support frame 6, the intersection of the support members 6b and 6c fits therein. By fitting each notch 5a into the support members 6b and 6c, the positioning of the sedimentation inclined plate 5 with respect to a plurality of support frames 6 (i.e., 6A, 6B, 6C) is achieved, and the sedimentation inclined plate 5 is prevented from falling off the support frame 6.

[0021] The sedimentation promoting device 2 having such a configuration is disposed in the sedimentation tank 1, and sediment in the water to be treated flowing into the sedimentation tank 1 is promoted to sediment by the increased sedimentation area provided by the plurality of sedimentation inclined plates 5.

[0022] FIG. 6 is a schematic front view of a suspension tool according to an embodiment as viewed from the flow direction of the water to be treated in the sedimentation tank, and FIG. 7 is a schematic side view of the suspension tool shown in FIG. 6 as viewed from the side wall along the flow direction of the water to be treated in the sedimentation tank. In this embodiment, the suspension tool 7 is composed of a first coupling tool 12, a second coupling tool 14, and a coupling bolt 11, and the inclined plate holding assembly 3 is connected to the suspension structure 8 via this suspension tool 7. The upper end of the coupling bolt 11 is firmly fixed to the suspension structure 8 and is a stationary member that allows only a certain amount of displacement in the tank length direction D1 and the tank width direction D2. The first coupling tool 12 is also a stationary member fixed to the lower end of the coupling bolt 11 and allowing only a certain amount of displacement in the tank length direction D1 and the tank width direction D2.

[0023] The first coupling tool 12 is configured to allow horizontal swinging of the second coupling tool 14 with respect to the first coupling tool 12. Specifically, the first coupling tool 12 is a member having an inner edge that allows swinging of the second coupling tool 14 with respect to the first coupling tool 12. The first coupling tool 12 shown in FIGS. 6 and 7 is a coupling hook having an opening 12a, and the second coupling tool 14 is suspended from the inner edge of the hook of the first coupling tool 12 through the opening 12a. The second coupling tool 14 can swing or displace along the inner edge of the hook of the first coupling tool 12.

[0024] As shown in FIG. 7, the second coupler 14 is a ring-shaped coupler having a ring shape, and the support frame 6 (upper part) of the inclined plate holding assembly 3 can be suspended from the inner edge at the lower part thereof. The second coupler 14 suspends the inclined plate holding assembly 3 so that the inclined plate holding assembly 3 can swing in a horizontal direction perpendicular to the swinging direction of the second coupler to which the inclined plate holding assembly 3 is connected to the first coupler 12. In the present embodiment, the opening 12a of the first coupler 12 faces the pond width direction D2 (see FIG. 6), and the second coupler 14 suspended from the inner edge of the hook of the first coupler 12 can swing in the pond width direction D2 along the inner edge of the hook of the first coupler 12 (see FIG. 7). On the other hand, the inclined plate holding assembly 3 suspended from the lower part of the second coupler 14 can swing in the pond length direction D1 perpendicular to the pond width direction D2 along the inner edge of the second coupler 14 having a ring shape.

[0025] According to such a configuration, the second coupler 14 and the inclined plate holding assembly 3 suspended from the first coupler 12 can swing in the pond width direction D2, and the inclined plate holding assembly 3 suspended from the second coupler 14 can swing in the pond length direction D1. Therefore, when sloshing of the water to be treated occurs in the sedimentation pond 1, the displacement of the inclined plate holding assembly 3 caused by the force component parallel to the pond length direction D1 of the water to be treated is alleviated by the swinging between the second coupler 14 and the inclined plate holding assembly 3. Further, the displacement of the inclined plate holding assembly 3 caused by the force component parallel to the pond width direction D2 of the water to be treated is alleviated by the swinging between the first coupler 12 and the second coupler 14. As a result, an excessive load due to the sloshing of the water to be treated is prevented from being applied not only to the stationary structures (for example, the connecting bolts 11 and the suspension structure 8, etc.) to which the sedimentation assembly 3 is connected, but also to the inclined plate holding assembly 3 itself. Therefore, it is possible to prevent damage to the components of the sedimentation promoting device 2 due to sloshing with a simple and inexpensive configuration in which the inclined plate holding assembly 3 is suspended from the suspension structure 8 via the first coupler 12 and the second coupler 14 whose swinging directions are different by 90 degrees in the horizontal direction.

[0026] As shown in FIGS. 6 and 7, the first connector 12 preferably has a first gate 12b capable of closing its 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 so that the second connector 14 can pass through the opening 12a of the first connector 12, and the first gate 12b is rotated (see the dashed line in FIG. 6). The first gate 12b prevents the second connector 14 from falling off the first connector 12 and at the same time enables the second connector 14 to be easily engaged with the first connector 12.

[0027] The second connector 14 shown in FIGS. 6 and 7 has an elliptical shape such as a carabiner. Similar to the first connector 12, the second connector 14 preferably has a second gate 14b capable of closing its opening 14a. The second gate 14b normally closes the opening 14a under a load 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 inclined plate holding assembly 3 with the second connector 14, the first connector 12 or the support frame 6 of the inclined plate holding assembly 3 is pressed against the second gate 14b with a force greater than the load applied to the second gate 14b so that the support frame 6 of the first connector 12 or the inclined plate holding assembly 3 can pass through the opening 14a of the second connector 14, and the second gate 14b is rotated (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 and at the same time enables the first connector 12 and the inclined plate holding assembly 3 to be easily engaged with the second connector 14.

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

[0029] The above-described embodiments are described for the purpose of enabling those having ordinary knowledge in the technical field to which the present invention pertains to practice the present invention. Various modifications of the above embodiments can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is construed in the broadest scope in accordance with the technical idea defined by the claims.

Explanation of Reference Numerals

[0030] 1 Sedimentation pond 2 Sedimentation promotion device 3 Inclined plate holding assembly 5 Inclined plate 6 Support frame 7 Suspension tool 8 Suspension structure 11 Connecting bolt 12 First coupling member (connecting hook) 14 Second coupling member (ring-shaped coupling member)

Claims

1. a tilt plate support assembly for supporting the plurality of submerged tilt plates parallel to each other; a suspension structure for supporting the ramp retention assembly; a suspension device for suspending the ramp support assembly from the suspension structure; The hanging device includes a first connector and a second connector suspended from the first connector and having a ring shape; The first connector suspends the second connector so as to be swingable in a horizontal direction, A sinking promotion device, wherein 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 capable of closing an opening of the connecting hook.

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