JP7075071B1 - Sloshing suppression structure in sedimentation basin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an increase in shaking due to sloshing while improving installability and maintainability, and to easily install the product. SOLUTION: A sloshing suppressing structure in a settling basin includes an inclined plate unit 5 having a plurality of inclined plates 52, a plurality of hook bolts 6 for suspending the inclined plate units 5, and a first hook among a plurality of hook bolts 6. A damper 7 connected to the bolt 61 and the second hook bolt 62 is provided. The damper 7 is connected to the first connection position P1 of the first hook bolt 61 and the second connection position P2 having a height different from that of the first connection position P1 of the second hook bolt 62, with respect to the first connection position P1. The vibration of the second connection position P2 is attenuated. [Selection diagram] Fig. 3

Description

The present invention relates to a sloshing suppression structure in a settling basin.

Patent Document 1 describes a sloshing suppression structure that prevents the settling device from swinging together with the water due to sloshing of water in the settling pond during a large-scale earthquake and damaging the settling device. In this sloshing suppression structure, a shock absorber is interposed between the frame located at the parallel end of the settling inclined plate of the settling device and the side wall of the settling basin.

Japanese Unexamined Patent Publication No. 2016-159199

However, the sloshing suppression structure described in Patent Document 1 has a problem that it is difficult to install because it is necessary to drain the water from the settling basin or dive into the settling basin in order to arrange the shock absorber. Similarly, in order to maintain the shock absorber, it is necessary to drain the water from the settling basin or allow the operator to dive into the settling basin, which causes a problem that maintenance is difficult. Further, there is a problem that installation is difficult when the separation between the settling device and the side wall of the settling basin is narrow and when the settling device is movable.

Therefore, it is an object of the present invention to provide a sloshing suppression structure in a settling basin that can suppress an increase in shaking due to sloshing while improving installability and maintainability and can be easily installed.

The sloshing suppression structure in the settling pond according to the present invention includes an inclined plate unit having a plurality of inclined plates, a plurality of hook bolts for suspending the inclined plate units, and a first hook bolt and a second hook among the plurality of hook bolts. With a damper connected to the bolt, the damper is connected to a second connection position where the first connection position of the first hook bolt and the first connection position of the second hook bolt are different in height. Damps the vibration of the second connection position with respect to one connection position.

In this sloshing suppression structure in the settling basin, the heights of the first connection position of the first hook bolt and the second connection position of the second hook bolt are different. The relative distance between the position and the second connection position fluctuates, and the second connection position vibrates with respect to the first connection position. However, the damper is connected to the first hook bolt and the second hook bolt at the first connection position and the second connection position to attenuate the vibration of the second connection position with respect to the first connection position. Therefore, when the settling basin is sloshed, it is possible to suppress an increase in the swing of the inclined plate unit in the arrangement direction of the first hook bolt and the second hook bolt. Further, since the damper is connected to a plurality of hook bolts for suspending the inclined plate unit, the damper can be installed and maintained from above the settling pond. Therefore, the damper can be easily installed and maintained. Moreover, since the damper is arranged only in a small space between the first hook bolt and the second hook bolt, a wide space can be opened above the inclined plate unit. Therefore, cleaning equipment and the like for cleaning the piping and the inclined plate unit can be arranged in this space.

The damper may be a fluid resistance damper that obtains damping force by fluid resistance, a steel damper that obtains damping force by deformation of metal, or a friction damper that obtains damping force by frictional resistance. It may be an elastic damper that obtains a damping force by an elastic force. In the sloshing suppression structure in these sedimentation basins, a fluid resistance damper, a steel damper, a friction damper, or an elastic damper is used as a damper to easily and easily attenuate the vibration of the second connection position with respect to the first connection position. Can be done. Examples of the liquid resistance damper include an oil damper that obtains a damping force by the fluid resistance of oil, a viscous damper that uses a viscous fluid instead of oil, and an air damper that obtains a damping force by the fluid resistance of air. .. Examples of the steel damper include a bent plate-shaped damper and a coil spring-shaped one. Examples of the elastic damper include a rubber damper that obtains a damping force by the elastic force or the viscoelastic force of the rubber.

The second hook bolt may be a hook bolt adjacent to the first hook bolt. In the sloshing suppression structure in this settling basin, since the second hook bolt is a hook bolt adjacent to the first hook bolt, the damper is connected to the first hook bolt and the second hook bolt without being interfered with by other hook bolts. can do.

The tilt plate unit extends in the first direction, which is the horizontal direction, and the second direction, which is the horizontal direction orthogonal to the first direction, and the second hook bolt is adjacent to the first hook bolt in the first direction. It may be a hook bolt. In the sloshing suppression structure in this settling basin, since the second hook bolt is a hook bolt adjacent to the first hook bolt in the first direction, the damper can be used as the first hook bolt and the second hook bolt without being interfered with by other hook bolts. It can be connected to a hook bolt and can appropriately suppress an increase in shaking of the inclined plate unit in the first direction.

The plurality of hook bolts may be suspended from a suspension frame suspended on a pair of side walls facing each other in the first direction. In the sloshing suppression structure in this sedimentation basin, a plurality of hook bolts are suspended on a suspension frame suspended from a pair of side walls facing each other in the first direction, but the first hook bolt and the second hook bolt adjacent to each other in the first direction are suspended. Since the damper is connected to the hook bolt, the damper can dampen the swing of the inclined plate unit in the first direction. Therefore, it is possible to prevent the inclined plate unit from colliding with the pair of side walls.

Dampers may be arranged at each of both ends when the inclined plate unit is divided into three in the first direction. In the sloshing suppression structure in this settling basin, dampers are placed at both ends when the inclined plate unit is divided into three in the first direction. Therefore, when the inclined plate unit is shaken in the first direction due to sloshing, it is inclined. The shaking of the plate unit can be effectively suppressed.

According to the present invention, it is possible to suppress an increase in shaking due to sloshing while improving installability and maintainability, and it is possible to easily install the product.

FIG. 1 is a schematic cross-sectional view of a settling basin to which a sloshing suppression structure is applied in the settling basin according to the embodiment. FIG. 2 is a schematic plan view of the sedimentation basin shown in FIG. FIG. 3 is a schematic cross-sectional view taken along the line III-III shown in FIG. FIG. 4 is an enlarged view of a part of FIG. 5 (a) and 5 (b) are schematic views of a damper, a first hook bolt, and a second hook bolt. FIG. 6 is a schematic view showing an oil damper. FIG. 7 is a schematic view showing a steel damper. FIG. 8 is a schematic view showing a friction damper. FIG. 9 is a schematic diagram of a rubber damper. 10 (a) and 10 (b) are schematic views of a damper, a first hook bolt, and a second hook bolt.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a schematic cross-sectional view of a settling basin 1 of a water purification plant to which a sloshing suppression structure in the settling basin according to the embodiment is applied. FIG. 2 is a schematic plan view of the settling basin 1 shown in FIG. FIG. 3 is a schematic cross-sectional view taken along the line III-III shown in FIG. FIG. 4 is an enlarged view of a part of FIG. As shown in FIGS. 1 to 4, the settling basin 1 has a pair of side walls 3 facing the first direction D1 in the horizontal direction, a plurality of suspension frames 4 suspended on the pair of side walls 3, and a plurality of suspensions. A tilting settling device 2 suspended from a frame 4 is provided. In the settling basin 1, water flows toward the second direction D2, which is a horizontal direction orthogonal to the first direction D1.

The inclined sedimentation device 2 is a device installed in the sedimentation basin 1 to increase the sedimentation area, promote the sedimentation of suspended solids such as flocs, and improve the treatment capacity of the water purification plant. The tilt settling device 2 includes a tilt plate unit 5, a plurality of hook bolts 6, and one or a plurality of dampers 7.

The inclined plate unit 5 is formed in a rectangular parallelepiped shape as a whole and is arranged between a pair of side walls 3. The inclined plate unit 5 has a unit frame 51 and a plurality of inclined plates 52.

The unit frame 51 is a frame body that holds a plurality of inclined plates 52. The unit frame 51 is formed, for example, in a rectangular parallelepiped grid pattern.

Each of the plurality of inclined plates 52 is a plate-shaped member inclined with respect to the vertical direction in order to increase the settling area. The plurality of inclined plates 52 are arranged in the first direction D1 so as to be parallel to each other. It should be noted that each of the plurality of inclined plates 52 may extend in the second direction D2 or may extend in a direction inclined with respect to the second direction D2.

The plurality of hook bolts 6 are members for suspending the inclined plate unit 5 with respect to the plurality of suspension frames 4. The plurality of hook bolts 6 are swayably suspended from each of the plurality of suspension frames 4. Further, the plurality of hook bolts 6 are swayably suspended from the unit frame 51 of the inclined plate unit 5. That is, a plurality of hook bolts 6 are suspended from one suspension frame 4, and the unit frame 51 is suspended from all hook bolts 6 suspended from the plurality of suspension frames 4.

The damper 7 is connected to any two hook bolts 6 of the plurality of hook bolts 6. Of the plurality of hook bolts 6, two hook bolts connected to the damper 7 are referred to as a first hook bolt 61 and a second hook bolt 62. When only one damper 7 is provided in the inclined settling device 2, the first hook bolt 61 and the second hook bolt 62 are also only one set. When a plurality of dampers 7 are provided in the inclined settling device 2, a plurality of sets of the first hook bolt 61 and the second hook bolt 62 are also provided. When a plurality of dampers 7 are connected to one hook bolt 6, the hook bolt 6 can be any of the first hook bolt 61 and the second hook bolt 62.

The damper 7 is connected to the first connection position P1 of the first hook bolt 61 and to the second connection position P2 of the second hook bolt 62. The height of the second connection position P2 is different from that of the first connection position P1. In the present embodiment, as an example, the first connection position P1 is higher than the second connection position P2.

Here, with reference to FIG. 5, the positional relationship between the first connection position P1 and the second connection position P2 will be described. FIG. 5 is a schematic view of the damper 7, the first hook bolt 61, and the second hook bolt 62. FIG. 5A shows a case where the inclined plate unit 5 moves to the side of the second hook bolt 62 with respect to the first hook bolt 61, and FIG. 5B shows a case where the inclined plate unit 5 is stationary. (2) The case where the hook bolt 62 is moved to the side of the first hook bolt 61 is shown. In FIG. 5, the state in which the inclined plate unit 5 is stationary is shown by a solid line, and the state in which the inclined plate unit 5 is shaken by sloshing is shown by a two-dot chain line. Further, the linear distance between the first connection position P1 and the second connection position P2 is defined as the relative distance L.

As shown in FIG. 5, when the inclined plate unit 5 is shaken by sloshing, the first hook bolt 61 and the second hook bolt 62 are inclined, so that the relative distance L is displaced so as to vibrate. For example, as shown in FIG. 5A, when the inclined plate unit 5 moves toward the second hook bolt 62 with respect to the first hook bolt 61, the relative distance L is larger than that when the inclined plate unit 5 is stationary. Will be long. On the other hand, as shown in FIG. 5B, when the inclined plate unit 5 moves from the stationary state to the first hook bolt 61 side with respect to the second hook bolt 62, the relative distance L is such that the inclined plate unit 5 is stationary. It will be shorter than if it were.

In this way, when the inclined plate unit 5 shakes due to sloshing, the relative distance L is displaced so as to vibrate. That is, when the inclined plate unit 5 shakes due to sloshing, the second connection position P2 vibrates with respect to the first connection position P1. Therefore, the damper 7 is connected to the first connection position P1 and the second connection position P2 so as to attenuate the vibration of the second connection position P2 with respect to the first connection position P1.

Examples of the damper 7 include a fluid resistance damper that obtains a damping force by a fluid resistance force, an elastic damper that obtains a damping force by an elastic force, an elastic damper that obtains a damping force by an elastic force, and a steel damper that obtains a damping force by deformation of a metal. Examples thereof include a friction damper that obtains a damping force by frictional resistance.

Examples of the liquid resistance damper include an oil damper that obtains a damping force by the fluid resistance of oil, a viscous damper that uses a viscous fluid instead of oil, and an air damper that obtains a damping force by the fluid resistance of air. As an example of the fluid resistance damper, FIG. 6 shows a schematic diagram of the oil damper. The oil damper 71 shown in FIG. 6 has a cylinder portion 71b in which an oil chamber 71a is formed, a rod portion 71c inserted into the cylinder portion 71b, and a piston fixed to the rod portion 71c and arranged in the oil chamber 71a. It has 71d and. The piston 71d is formed with a hole such as an orifice through which oil passes. Then, either one of the cylinder portion 71b and the rod portion 71c is connected to the first hook bolt 61 at the first connection position P1, and any one of the cylinder portion 71b and the rod portion 71c is connected to the second connection position P2. Is connected to the second hook bolt 62. In this oil damper 71, a damping force is generated by the resistance of the oil passing through the piston 71d.

Examples of the steel damper include a bent plate-shaped damper and a coil spring-shaped one. As an example of a steel damper, FIG. 7 shows a schematic view of a bent plate-shaped steel damper. The steel damper 72 shown in FIG. 7 is composed of a bent plate-shaped steel 72a. Then, one end of the steel material 72a is connected to the first hook bolt 61 at the first connection position P1, and the other end of the steel material 72a is connected to the second hook bolt 62 at the second connection position P2. Has been done. In this steel material damper 72, a damping force is generated by changing the force when the steel material 72a bends into heat energy or the like.

Examples of the friction damper include a friction damper that generates a frictional force by pinching. As an example of the friction damper, FIG. 8 shows a schematic diagram of a friction damper that generates a frictional force by pinching. The friction damper 73 shown in FIG. 8 has a first connection portion 73a connected to the first hook bolt 61 at the first connection position P1 and a second connection portion connected to the second hook bolt 62 at the second connection position P2. It has a 73b and a holding portion 73c that is fixed to the first connecting portion 73a and slidably sandwiches the second connecting portion 73b. An elongated hole 73d is formed in the second connecting portion 73b, and the holding portion 73c is fastened with a bolt through the elongated hole 73d to slidably sandwich the second connecting portion 73b. In this friction damper 73, a damping force is generated by the frictional force between the second connecting portion 73b and the holding portion 73c.

Examples of the elastic damper include a rubber damper that obtains a damping force by the elastic force or the viscoelastic force of the rubber. As an example of the elastic damper, FIG. 9 shows a schematic diagram of a rubber damper that exerts a frictional force by the elastic stretching force of the rubber. The rubber damper 74 shown in FIG. 9 has a first connection portion 74a connected to the first hook bolt 61 at the first connection position P1 and a second connection portion 74b connected to the second hook bolt 62 at the second connection position P2. And a rubber portion 74c arranged between the first connection portion 74a and the second connection portion 74b. The end surface 74d of the first connection portion 74a on the rubber portion 74c side and the end surface 74e of the second connection portion 74b on the rubber portion 74c side are flat surfaces facing each other. In the rubber damper 74, a damping force is generated by the elastic stretching force of the rubber portion 74c between the end surface 74d of the first connecting portion 74a and the end surface 74e of the second connecting portion 74b.

The number, arrangement, etc. of the dampers 7 in the inclined settling device 2 are not particularly limited, and are appropriately set according to the size and shape of the inclined settling device 2, the size and shape of the settling basin 1, and the like.

For example, the damper 7 may be connected to all the hook bolts 6, or the damper 7 may be connected to only a part of the hook bolts 6. Further, the damper 7 may be connected to the adjacent hook bolts 6, or the damper 7 may be connected to the hook bolts 6 which are not adjacent to each other.

When connecting the damper 7 to the adjacent hook bolts 6, the second hook bolt 62 may be the first hook bolt 61 and the hook bolt 6 adjacent to the first direction D1, and the first hook bolt 61 and the second hook bolt 62. It may be a hook bolt 6 adjacent to the direction D2, or it may be a hook bolt 6 adjacent to the first hook bolt 61 and the direction inclined with respect to the first direction D1 and the second direction D2.

On the other hand, when the damper 7 is connected to the hook bolts 6 that are not adjacent to each other, the damper 7 needs to be arranged avoiding the hook bolt 6 arranged between the first hook bolt 61 and the second hook bolt 62. However, as the horizontal distance between the first hook bolt 61 and the second hook bolt 62 becomes longer, the displacement amount of the relative distance L due to the movement of the inclined plate unit 5 becomes larger. For example, FIG. 10A shows one-span installation when a plurality of hook bolts 6 are arranged at equal intervals, and FIG. 10B shows a plurality of hook bolts 6 arranged at equal intervals. It shows the two-span installation in the case of. In the one-span installation, the damper 7 is connected to the adjacent hook bolts 6, and in the two-span installation, the damper 7 is connected to the two adjacent hook bolts 6. As is clear from the comparison between FIGS. 10 (a) and 10 (b), when a plurality of hook bolts 6 are arranged at equal intervals, the two-span installation is better than the one-span installation. The amount of displacement of the relative distance L due to the movement of the unit 5 becomes large. Therefore, from the viewpoint of increasing the damping effect of one damper 7, it is also possible to connect the damper 7 to the hook bolts 6 which are not adjacent to each other to increase the horizontal distance between the first hook bolt 61 and the second hook bolt 62. preferable.

Further, when the inclined plate unit 5 swings in the first direction D1 due to sloshing, the displacement amount of the inclined plate unit 5 becomes larger at both ends in the first direction D1 than at the central portion in the first direction D1. Therefore, from the viewpoint of increasing the damping effect of one damper 7, the damper 7 is arranged at each of both ends when the inclined plate unit 5 is divided into three, four, or five in the first direction D1. Is preferable. In this case, dampers 7 may be arranged in addition to both ends.

As described above, in the sloshing suppression structure in the settling basin according to the present embodiment, the heights of the first connection position P1 of the first hook bolt 61 and the second connection position P2 of the second hook bolt 62 are different. When the settling basin 1 is sloshed due to an earthquake or the like, the relative distance L between the first connection position P1 and the second connection position P2 fluctuates, and the second connection position P2 vibrates with respect to the first connection position P1. Become. However, the damper 7 is connected to the first hook bolt 61 and the second hook bolt 62 at the first connection position P1 and the second connection position P2, and attenuates the vibration of the second connection position P2 with respect to the first connection position P1. .. Therefore, when the settling basin 1 is sloshed, it is possible to suppress an increase in the swing of the inclined plate unit 5 in the arrangement direction of the first hook bolt 61 and the second hook bolt 62. Further, since the damper 7 is connected to the plurality of hook bolts 6 for suspending the inclined plate unit 5, the damper 7 can be installed and maintained from above the settling basin 1. Therefore, the damper 7 can be easily installed and maintained. Moreover, since the damper 7 is arranged only in a small space between the first hook bolt 61 and the second hook bolt 62, a wide space A can be opened above the inclined plate unit 5. Therefore, cleaning equipment for cleaning the piping and the inclined plate unit 5 can be arranged in this space A.

Further, by using a fluid resistance damper, a steel material damper, a friction damper, or an elastic damper as the damper 7, the vibration of the second connection position P2 with respect to the first connection position P1 can be easily and easily damped.

Further, since the second hook bolt 62 is a hook bolt adjacent to the first hook bolt 61, the damper 7 is connected to the first hook bolt 61 and the second hook bolt 62 without being interfered with by other hook bolts 6. can do.

Further, since the second hook bolt 62 is the first hook bolt 61 and the hook bolt 6 adjacent to the first direction D1, the damper 7 is connected to the first hook bolt 61 and the first hook bolt 6 without being interfered with by other hook bolts 6. It can be connected to the two hook bolts 62, and the increase in the sway of the inclined plate unit 5 in the first direction D1 can be appropriately suppressed.

Further, although a plurality of hook bolts 6 are suspended from the suspension frame 4 suspended on the pair of side walls 3 facing the first direction D1, the first hook bolt 61 and the second hook adjacent to the first direction D1 are suspended. By connecting the damper 7 to the bolt 62, the damper 7 can attenuate the shaking of the inclined plate unit 5 in the first direction D1. Therefore, it is possible to prevent the inclined plate unit 5 from colliding with the pair of side walls 3.

Further, when the inclined plate unit 5 is divided into three, four, or five in the first direction D1, dampers are arranged at both ends, so that the inclined plate unit 5 swings in the first direction D1 due to sloshing. At that time, the shaking of the inclined plate unit 5 can be effectively suppressed.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and the present invention may be modified or applied to other objects without changing the gist described in each claim. good.

1 ... Sedimentation pond, 2 ... Inclined sedimentation device, 3 ... Side wall, 4 ... Suspended frame, 5 ... Inclined plate unit, 6 ... Hook bolt, 7 ... Damper, 51 ... Unit frame, 52 ... Inclined plate, 61 ... First hook Bolt, 62 ... Second hook bolt, 71 ... Oil damper, 71a ... Oil chamber, 71b ... Cylinder part, 71c ... Rod part, 71d ... Piston, 72 ... Steel damper, 72a ... Steel material, 73 ... Friction damper, 73a ... No. One connection part, 73b ... Second connection part, 73c ... Holding part, 73d ... Long hole, A ... Space, D1 ... First direction, D2 ... Second direction, L ... Relative distance, P1 ... First connection position, P2 … Second connection position.

Claims (9)

An inclined plate unit with multiple inclined plates,
A plurality of hook bolts for suspending the inclined plate unit, and
A damper connected to the first hook bolt and the second hook bolt among the plurality of hook bolts is provided.
The damper is connected to a second connection position having a height different from that of the first connection position of the first hook bolt and the first connection position of the second hook bolt, and the first connection position with respect to the first connection position. (2) Attenuate the vibration at the connection position,
Sloshing suppression structure in the settling basin. The damper is a fluid resistance damper that obtains a damping force by a fluid resistance force.
The sloshing suppression structure in the sedimentation basin according to claim 1. The damper is a steel damper that obtains a damping force by deformation of metal.
The sloshing suppression structure in the sedimentation basin according to claim 1. The damper is a friction damper that obtains a damping force by frictional resistance.
The sloshing suppression structure in the sedimentation basin according to claim 1. The damper is an elastic damper that obtains a damping force by an elastic force.
The sloshing suppression structure in the sedimentation basin according to claim 1. The second hook bolt is a hook bolt adjacent to the first hook bolt.
The sloshing suppression structure in the settling basin according to any one of claims 1 to 5. The inclined plate unit extends in a first direction which is a horizontal direction and a second direction which is a horizontal direction orthogonal to the first direction.
The second hook bolt is a hook bolt adjacent to the first hook bolt in the first direction.
The sloshing suppression structure in the settling basin according to any one of claims 1 to 6. The plurality of hook bolts are suspended from a suspension frame suspended on a pair of side walls facing each other in the first direction.
The sloshing suppression structure in the sedimentation basin according to claim 7. The dampers are arranged at both ends when the inclined plate unit is divided into three in the first direction.
The sloshing suppression structure in the settling basin according to claim 7 or 8.

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