Settling acceleration device

Abstract

【Problem】To provide a sedimentation promoting device capable of inexpensively and surely suppressing damage to a sedimentation inclined plate caused by sloshing. 【Solution means】The sedimentation promoting device includes a rectangular lattice structure 14 and a sedimentation inclined plate 5 disposed obliquely within the lattice structure 14. The sedimentation inclined plate 5 has a lower notch 5a formed at its lower end. The lower notch 5a engages with a connection portion between a first vertical support member 6-1b and a lower horizontal support member 6-2c of the lattice structure 14. A vertical gap G1 is formed between the upper end of the sedimentation inclined plate 5 and an upper horizontal support member 6-1c of the lattice structure 14, and the sedimentation inclined plate 5 is configured to be movable within the lattice structure 14. 【Selected drawing】Figure 7

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, when water sloshing (swaying) occurs in the sedimentation basin due to an earthquake, the settling promotion device may also sway relative to the sedimentation basin. Sloshing of the settling promotion device may lead to 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 members, such as the hanging hooks and hanging bolts, that suspend the frame, potentially leading to fatigue failure of the hanging members.

[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 a settling inclined plate due to sloshing. [Means for solving the problem]

[0010] In one aspect, a sedimentation promotion device is provided that promotes the settling of sediments contained in the water to be treated, comprising a rectangular lattice structure and a sedimentation inclined plate arranged at an angle within the lattice structure, the lattice structure having an upper horizontal support member located above the sedimentation inclined plate, a lower horizontal support member located below the sedimentation inclined plate, and a first vertical support member and a second vertical support member located on both sides of the sedimentation inclined plate, the sedimentation inclined plate having a lower notch formed at its lower end, the lower notch engaging with the connection between the first vertical support member and the lower horizontal support member, a vertical gap being formed between the upper end of the sedimentation inclined plate and the upper horizontal member, and the sedimentation inclined plate being configured to be movable within the lattice structure.

[0011] In one aspect, the upper horizontal support member has a protrusion that protrudes upward, the upper end of the sinking inclined plate is located below the protrusion, and the vertical gap is formed between the upper end of the sinking inclined plate and the protrusion. In one aspect, the sinking inclined plate further has an upper notch formed at its upper end, the upper notch engaging with the upper horizontal support member, and the vertical gap being formed between the lower end of the upper notch and the upper horizontal support member. In one embodiment, the width of the grid structure is 100 mm or less and the height of the grid structure is 180 mm or less. [Effects of the Invention]

[0012] When water sloshing (swaying) occurs in the sedimentation tank due to an earthquake, the settling inclined plate is subjected to water pressure and can move within the lattice structure with the lower notch as a fulcrum. Therefore, the settling inclined plate can release excessive water pressure (load), and as a result, damage to the settling inclined plate due to water sloshing can be 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 as viewed from the direction of flow of the water to be treated in the sedimentation 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 perspective view showing a settling ramp supported by three grid structures. [Figure 7] FIG. 7 is an enlarged perspective view of one embodiment of the grid structure and settling ramp. [Figure 8] FIG. 8 is a side view showing the subsidence inclined plate and lattice structure shown in FIG. [Figure 9] FIG. 9 is an enlarged perspective view showing another embodiment of the grid structure and the settling inclined plate. [Figure 10] FIG. 10 is a side view showing the submerged inclined plate and lattice structure shown in FIG. [Figure 11] FIG. 11 is a plan view showing another embodiment of the inclined settling plate. [Figure 12] FIG. 12 is an enlarged perspective view of one embodiment of the settling ramp shown in FIG. 11 supported by a grid structure. [Figure 13] FIG. 13 is a side view of the sinking inclined plate and lattice structure shown in FIG. 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 supporting 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 , a suspension structure 8 is suspended across 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 a suspension structure 8. Examples of the suspension structure 8 include precast concrete girders and steel girders. Although not shown, the suspension structure 8 may be composed of a steel girder connected to the suspender 7 and extending in the width direction D, 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 of the pond, and the movement of the suspension structure 8 can move the inclined plate support assembly 3 in the length direction D1 of the pond.

[0018] In this embodiment, the suspending device 7 is composed of a hook bolt 11 extending from the suspension structure 8 toward the support frame 6, and a connecting hook 12 fixed to the tip of the hook bolt 11. The connecting hook 12 is configured to be able to engage with the upper part of the support frame 6. Note that the configuration of the suspending device 7 is not limited to the configuration of this embodiment as long as the suspending device 7 can suspend the inclined plate holding assembly 3 from the suspension structure 8.

[0019] 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 subsidence 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. In one embodiment, the support members 6b and 6c are, for example, wire mesh or 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 an identical rectangular lattice structure 14. This configuration allows parallel inclined subsidence plates 5 to be arranged in multiple rows in the vertical direction.

[0020] As shown in FIG. 3, in this embodiment, the inclined plate assembly 3 includes three support frames 6 arranged at equal intervals in the pond length direction D1. In one embodiment, the inclined plate 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 inclined settling plate 5 is inserted obliquely into each lattice structure 14 formed by the support members 6b and 6c of the support frame 6. When multiple inclined settling plates 5 are inserted into each lattice structure 14 of the support frame 6, each inclined settling plate 5 is supported obliquely on the diagonal of each lattice structure 14 formed by the support members 6a and 6b of the support frame 6. With this configuration, the multiple inclined settling plates 5 are arranged parallel to each other. Hereinafter, 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).

[0021] FIG. 5 is a schematic diagram showing a sedimentation inclined plate according to one embodiment. FIG. 6 is a perspective view showing a sedimentation inclined plate supported by three lattice structures 14. The sedimentation inclined plate 5 has three lower cutouts 5a at its lower end. Each rectangular lattice structure 14 is composed of support members 6b and 6c. Each lower cutout 5a engages with the intersection of the support members 6b and 6c when the sedimentation inclined plate 5 is inserted into each lattice structure 14 of the support frame 6. The engagement of each lower cutout 5a with the support members 6b and 6c positions the sedimentation inclined plate 5 relative to the multiple support frames 6 (i.e., 6A, 6B, and 6C) and prevents the sedimentation inclined plate 5 from falling off the support frame 6.

[0022] In the embodiment shown in FIG. 6, one inclined submerged plate 5 is supported by three lattice structures 14, but in other embodiments, one inclined submerged plate 5 may be supported by two lattice structures 14, or four or more lattice structures 14.

[0023] FIG. 7 is an enlarged perspective view showing one embodiment of the lattice structure 14 and the inclined sedimentation plate 5. The inclined sedimentation plate 5 is disposed obliquely within the rectangular lattice structure 14. More specifically, the inclined sedimentation plate 5 is inclined along the diagonal line of the lattice structure 14. The inclined sedimentation plate 5 is not fixed to the lattice structure 14 but is simply supported by the lattice structure 14. Therefore, when subjected to water pressure, the inclined sedimentation plate 5 is movable within the lattice structure 14 relative to the lattice structure 14. However, longitudinal movement of the inclined sedimentation plate 5 is limited by the engagement between the lower notch 5a and the lattice structure 14.

[0024] The lattice structure 14 is composed of support members 6b and 6c of the support frame 6. In the following description, the support member 6c located above the submerged inclined plate 5 is referred to as the upper horizontal support member 6-1c, the support member 6c located below the submerged inclined plate 5 is referred to as the lower horizontal support member 6-2c, and the support members 6b located on both sides of the submerged inclined plate 5 are referred to as the first vertical support member 6-1b and the second vertical support member 6-2b.

[0025] The lower notch 5a formed at the lower end of the inclined plate 5 engages with the connection between the lower horizontal support member 6-2c and the first vertical support member 6-1b. The connection between the lower horizontal support member 6-2c and the first vertical support member 6-1b is located within the lower notch 5a of the inclined plate 5. More specifically, the lower notch 5a of the inclined plate 5 loosely engages with the connection between the lower horizontal support member 6-2c and the first vertical support member 6-1b. The inclined plate 5 is not fixed to the lower horizontal support member 6-2c and the first vertical support member 6-1b. A vertical gap G1 is formed between the upper end of the inclined plate 5 and the upper horizontal support member 6-1c. Therefore, the inclined plate 5 can move within the lattice structure 14, using the lower notch 5a as a fulcrum.

[0026] Figure 8 is a side view showing the inclined settling plate 5 and lattice structure 14 shown in Figure 7. As shown in Figure 8, when water sloshing (swaying) caused by an earthquake occurs in the sedimentation tank 1, the inclined settling plate 5 is subjected to water pressure and can move within the lattice structure 14 with the lower notch 5a as a fulcrum. Therefore, the inclined settling plate 5 can release excessive water pressure (load), and as a result, damage to the inclined settling plate 5 caused by water sloshing can be prevented.

[0027] In one embodiment, the width W of the lattice structure 14 is 100 mm or less, and the height H of the lattice structure 14 is 180 mm or less. The lower limits of the width W and height H of the lattice structure 14 are not particularly limited, as long as the intended purpose of the settling inclined plate 5, which is to promote the settling of sediments (impurities) contained in the water to be treated, can be achieved. The settling inclined plate 5 disposed within the lattice structure 14, whose upper limit for the width W is 100 mm and the upper limit for the height H is 180 mm, has a relatively small surface area. Therefore, when water sloshing occurs in the settling tank 1, the force applied from the water to the settling inclined plate 5 can be reduced. As a result, damage to the settling inclined plate 5 can be prevented.

[0028] 9 is an enlarged perspective view showing another embodiment of the lattice structure 14 and the sedimentation inclined plate 5. The configuration of this embodiment that is not particularly described is the same as the embodiment described with reference to FIGS. 5 to 8, so duplicated description will be omitted.

[0029] In this embodiment, the upper horizontal support member 6-1c of the lattice structure 14 has a protrusion 20 that protrudes upward. More specifically, the end of the upper horizontal support member 6-1c connected to the second vertical support member 6-2b forms the protrusion 20 that is raised upward. The upper end of the subsidence inclined plate 5 is located below the protrusion 20 of the upper horizontal support member 6-1c. A vertical gap G1 is formed between the upper end of the subsidence inclined plate 5 and the protrusion 20.

[0030] FIG. 10 is a side view showing the inclined settling plate 5 and lattice structure 14 shown in FIG. 9. As shown in FIG. 10, when water sloshing (swaying) caused by an earthquake occurs in the sedimentation basin 1, the inclined settling plate 5 is subjected to water pressure and can move within the lattice structure 14 with the lower notch 5a as a fulcrum. In particular, the protrusion 20 can increase the vertical gap G1 compared to the embodiment described with reference to FIGS. 7 and 8. As a result, damage to the inclined settling plate 5 caused by water sloshing can be more effectively prevented.

[0031] 9 and 10, the protrusion 20 is configured as a step portion formed by raising a portion of the upper horizontal support member 6-1c, but the shape of the protrusion 20 is not limited to this embodiment. For example, the protrusion 20 may have a curved shape in which a portion of the upper horizontal support member 6-1c is curved upward.

[0032] Fig. 11 is a plan view showing another embodiment of the sedimentation inclined plate 5. As shown in Fig. 11, the sedimentation inclined plate 5 has, in addition to the lower cutouts 5a, upper cutouts 5b formed at the upper end of the sedimentation inclined plate 5. The upper cutouts 5b are provided in the same number as the lower cutouts 5a.

[0033] FIG. 12 is an enlarged perspective view showing an embodiment in which the inclined plate 5 shown in FIG. 11 is supported by a lattice structure 14. The configuration of this embodiment, which is not specifically described, is the same as that of the embodiment described with reference to FIGS. 5 to 8, and therefore redundant description will be omitted. The upper notch 5b engages with the upper horizontal support member 6-1c. More specifically, the upper notch 5b loosely engages with the upper horizontal support member 6-1c, and the inclined plate 5 is not fixed to the upper horizontal support member 6-1c. A vertical gap G1 is formed between the lower end of the upper notch 5b and the upper horizontal support member 6-1c. Therefore, the upper end of the inclined plate 5 can move relative to the upper horizontal support member 6-1c.

[0034] FIG. 13 is a side view showing the inclined settling plate 5 and lattice structure 14 shown in FIG. 12. As shown in FIG. 13, when water sloshing (swaying) caused by an earthquake occurs in the sedimentation basin 1, the inclined settling plate 5 is subjected to water pressure and can move within the lattice structure 14, with the lower notch 5a as a fulcrum. In particular, the upper notch 5b can increase the vertical gap G1 compared to the embodiment described with reference to FIGS. 7 and 8. As a result, damage to the inclined settling plate 5 caused by water sloshing can be more effectively prevented.

[0035] 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 be obvious to a person skilled in the art, and the technical concept of the present invention may 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]

[0036] 1 Sedimentation tank 2. Sedimentation accelerator 3 Inclined Plate Holding Assembly 5. Settling inclined plate 5a Lower notch 5b Upper notch 6 Support Frame 6A First support frame 6B Second support frame 6C Third support frame 6a Frame body 6b, 6c Support member 6-1b First vertical support member 6-2b Second vertical support member 6-1c Upper horizontal support member 6-2c Lower horizontal support member 7 Hanging device 8 Suspension structure 11 Hook bolt 12 Connecting hooks 14 Lattice structure 20 Protrusion G1 Gap

Claims

1. A sedimentation promotion device that promotes the sedimentation of sediments contained in water to be treated, a rectangular lattice structure; a sinking inclined plate disposed obliquely within the lattice structure; The lattice structure has an upper horizontal support member located above the submerged inclined plate, a lower horizontal support member located below the submerged inclined plate, and a first vertical support member and a second vertical support member located on both sides of the submerged inclined plate, the sinking inclined plate has a lower notch formed at its lower end, and the lower notch engages with a connection portion between the first vertical support member and the lower horizontal support member; A vertical gap is formed between the upper end of the sinking inclined plate and the upper horizontal member, The settling promotion device, wherein the settling inclined plate is configured to be movable within the lattice structure.

2. the upper horizontal support member has a protruding portion that protrudes upward, The upper end of the sinking inclined plate is located below the protrusion, The settling promotion device according to claim 1 , wherein the vertical gap is formed between an upper end of the settling inclined plate and the protrusion.

3. the settling ramp plate further has an upper notch formed at its upper end, the upper notch engaging with the upper horizontal support member; The settling promotion device according to claim 1 , wherein the vertical gap is formed between a lower end of the upper cutout and the upper horizontal support member.

4. 2. The sedimentation promotion device according to claim 1, wherein the width of the lattice structure is 100 mm or less and the height of the lattice structure is 180 mm or less.

Images