JP7220437B1 - Inclined plate sedimentation system - Google Patents

Abstract

A tilting plate sedimentation system having sloshing suppression means of a tilting plate sedimentation device that can be easily applied to an existing tilting plate sedimentation system is provided. A restraining plate (31) is attached to both left and right ends of an inclined plate settling device (1) at a predetermined distance from the inclined plate (2), and at the same time, the inclined plate (2) is attached to a suspension bolt (22) that suspends the inclined plate settling device (1). A breakwater plate 6 is installed in parallel to suppress the growth of sloshing waves of water when an earthquake occurs. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to an inclined plate sedimentation system in which an inclined plate sedimentation device is suspended in a sedimentation tank, and to the inclined plate sedimentation system provided with sloshing suppression means.

Conventionally, in water purification plants, etc., as means for efficiently settling solids contained in the water to be treated, an inclined plate sedimentation device, in which a plurality of inclined plates are attached to a support frame and integrated, is used as a hanging means such as a hanging bolt. known is a tilt plate settling system suspended in a settling tank. In such an inclined plate sedimentation system, the inclined plate sedimentation device is not fixed to the sedimentation tank. As a result, the inclined plate sedimentation device also sloshed, and accidents occurred in which the inclined plate sedimentation device contacted the wall of the sedimentation tank, damaging the inclined plate and the support frame, or the inclined plate came off the support frame and fell. was

In Patent Document 1, by interposing a buffer device such as a coil spring member or a rubber-like elastic member between the inclined plate sedimentation device and the side wall of the sedimentation tank, sloshing at the time of an earthquake is suppressed, and the inclined plate and the support are suppressed. A structure is disclosed that prevents damage to the frame.

JP 2016-159199 A

In order to sufficiently suppress the sloshing of the shock absorber disclosed in Patent Document 1, it is necessary to install a large number of shock absorbers between the inclined plate sedimentation device and the side wall of the sedimentation tank, which is a large-scale operation.

An object of the present invention is to provide an inclined plate sedimentation system equipped with sloshing suppression means of an inclined plate sedimentation device that can be easily applied to existing inclined plate sedimentation systems.

The present invention provides an inclined plate sedimentation device having a plurality of inclined plates horizontally arranged at predetermined intervals so that the inclined surfaces are parallel to each other;
Suspension material suspended horizontally over the sedimentation tank,
a suspension means having an upper end attached to the suspension member and a lower end attached to the inclined plate settling device;
The inclined plate sedimentation device is suspended in the sedimentation tank via the suspension means, and a horizontal counterflow type inclined plate sedimentation system in which water flows horizontally along the surface of the inclined plate,
Above the inclined plate sedimentation device, a breakwater plate erected vertically along a direction parallel to the upper end of the inclined plate and shielding from the upper end of the inclined plate to the water surface is placed to prevent sloshing water waves. have multiple sheets spaced apart to prevent the growth of
The inclined plate sedimentation devices stand vertically along the direction of water flow, at both left and right ends as viewed from the direction of water flow, at a predetermined distance from the lower ends of the inclined plates arranged at the left and right ends. It is characterized by having a restraining plate that

The present invention includes the following configurations as preferred embodiments.
The breakwater plate is a plate-like member elongated in the horizontal direction, and the longitudinal direction thereof is arranged parallel to the upper end of the inclined plate.
The lower edge of the breakwater plate is at a position equal to or lower than the upper edge of the uppermost inclined plate of the inclined plate settling device.
The upper end of the breakwater plate is positioned higher than the water surface in the sedimentation tank.
The distance from the upper end of the breakwater plate to the lower end of the suspension member is 1 cm to 3 cm.
The breakwater plate is attached to the suspension means.
Long stiffeners parallel to the longitudinal direction of the breakwater plate are attached to the breakwater plate and the suspension means.
The distance between the lower ends of the inclined plates located at both left and right ends of the inclined plate sedimentation device and the restraining plates is 40 mm to 250 mm.

In the present invention, sloshing of the inclined plate settler can be greatly suppressed by arranging the restraining plates on both the left and right ends of the inclined plate settler and by arranging the breaker plate above the inclined plate settler. , it is possible to prevent damage to the inclined plate sedimentation device when an earthquake occurs. Moreover, the present invention can be easily applied to existing systems because it is only necessary to attach the suppressing plate to the inclined plate sedimentation device and the breakwater plate to the suspension member.

1 is a partial perspective view schematically showing the configuration of an embodiment of an inclined plate sedimentation system of the present invention; FIG. It is the figure which looked at the embodiment of FIG. 1 from the water flow direction. FIG. 2 is a top view of the inclined plate settling device of the embodiment of FIG. 1; FIG. 2 is an enlarged view of the suspension bolt of FIG. 1 and its surroundings, where (a) is a front view and (b) is an A-A' end view in (a). FIG. 2 is a partial perspective view schematically showing the configuration of an example of a conventional inclined plate sedimentation system; FIG. 5 is a view of the inclined plate sedimentation system of FIG. 4 as viewed in the water flow direction; FIG. 4 is an enlarged view of a suspension bolt and its surroundings in another embodiment of the inclined plate settling system of the present invention, where (a) is a front view and (b) is a B-B' end view in (a).

The present invention suppresses the sloshing of water in the sedimentation tank caused by an earthquake by arranging suppressing plates on the left and right ends of the inclined plate sedimentation device and a breakwater plate on the upper side, respectively. It is characterized by suppressing sloshing of the inclined plate sedimentation device. The configuration of the present invention will be described in detail below with reference to the drawings.

First, a configuration example of a conventional inclined plate sedimentation system will be described. FIG. 5 is a partial perspective view schematically showing the configuration of an example of a conventional inclined plate sedimentation system. This example is a transverse flow type inclined plate sedimentation system in which water flows horizontally along the surface of the inclined plate 2, and FIG. 6 shows the system of FIG. It is a diagram. In FIG. 5, illustration of a part of the inclined plate 2 on the left front side is omitted, and in FIGS. 5 and 6, illustration of water in the sedimentation tank 11 is omitted.

The inclined plate sedimentation system shown in FIGS. 5 and 6 includes an inclined plate sedimentation device 1 and suspension members 21 such as PC girders and steel girders (made of SS or SUS) suspended over a sedimentation tank 11 in the horizontal direction. , and suspension bolts 22 as suspension means. In the inclined plate sedimentation device 1, a plurality of inclined plates 2 are arranged at predetermined intervals so that the inclined surfaces are parallel to each other, and are fixed to and integrated with a horizontally long support frame 3, Furthermore, by connecting a plurality of supporting frames 3 arranged in the vertical direction to each other by means of struts 5, the interval between the inclined plates 2 is maintained, and twisting of the inclined plate sedimentation device 1 is prevented. The inclined plate sedimentation device 1 is suspended in the sedimentation tank by attaching the upper end of the suspension bolt 22 to the suspension member 21 and hooking the lower end to the uppermost support frame 3 .

The water to be treated flows along the inclined surface of the inclined plate 2 as indicated by the water flow direction F in FIG. After that, it slides down on the inclined plate 2 and settles on the bottom 11a of the sedimentation tank. Further, clarified water from which solid matter has been removed from the water to be treated rises along the inclined plate 2 . In this example, the lower end of the upper inclined plate 2 and the upper end of the lower inclined plate 2 have a gap in the horizontal direction. It is separated from the solids that settle through the opposite back side. Therefore, the rising clarified water is not mixed with the sedimented solids, and clarified water can be efficiently obtained.

Next, the features of the inclined plate sedimentation system of the present invention will be described.

FIG. 1 is a partial perspective view schematically showing the configuration of one embodiment of the inclined plate sedimentation system of the present invention, and FIG. 2 is a view of the system of FIG. 3 is a top view of the inclined plate sedimentation device of FIG. 1 to 3, the same members as in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof is omitted. Also, in FIG. 1, illustration of a part of the inclined plate 2 on the left front side, the restraining plate 31 and the mounting member 32 is omitted, and in FIGS.

A feature of the inclined plate sedimentation system of the present invention is that, in the inclined plate sedimentation system illustrated in FIGS. The reason is that the breakwater plate 6 is arranged above each. That is, the configuration of the present invention is the same as that of the conventional inclined plate sedimentation system except for the suppression plate 31 and the breakwater plate 6 .

The suppression plate 31 is a plate-like member, and as shown in FIGS. , vertically along the water flow direction F. The breakwater plate 6 is a long plate-like member, and as shown in FIGS. It is placed upright in the vertical direction.

In the direction orthogonal to the water flow direction F, the water to be treated passing through the gap between the inclined plate sedimentation device 1 and the side wall 11b of the sedimentation tank 11 is not treated by the inclined plate, so the width of the gap is as narrow as possible. set. On the other hand, in the direction parallel to the water flow direction F, there is a sufficient distance between the inclined plate sedimentation device 1 and the side wall (not shown) of the sedimentation tank 11 . Therefore, when shaking due to an earthquake acts in a direction perpendicular to the water flow direction F, the inclined plate sedimentation device 1 may sloshing and come into contact with the side wall 11b of the sedimentation tank 11 .

As described above, the shaking of an earthquake is first transmitted to the water in the sedimentation tank 11 to cause sloshing, and the sloshing of this water is transmitted to the inclined plate sedimentation device 1 to cause sloshing. At this time, the water rises and falls along the inclined plate 2, causing the inclined plate settling device 1 to sloshing. Moreover, above the inclined plate sedimentation device 1, the water wave that caused the sloshing grows large and propagates to the inclined plate sedimentation device 1 to cause sloshing.

In the present invention, the restraining plate 31 restrains the inclined plate settler 1 from being suddenly moved by water sloshing, and prevents the inclined plate settler 1 from contacting the side wall 11 b of the sedimentation tank 11 . At the same time, the suppression plate 31 suppresses the movement of water on both the left and right sides of the inclined plate sedimentation device 1, thereby suppressing the growth of water sloshing. Furthermore, the breakwater plate 6 suppresses the growth of waves on the inclined plate settler 1, that is, the growth of sloshing of water, thereby suppressing the sloshing of the inclined plate settler 1 by such waves. Therefore, as a whole, the sloshing of the inclined plate sedimentation device 1 is greatly suppressed, and the contact of the inclined plate sedimentation device 1 with the sedimentation tank 11 and the fall of the inclined plate 2 are prevented. The sloshing suppression effect of the inclined plate sedimentation device 1 can be obtained by either the suppression plate 31 or the breakwater plate 6, but a high suppression effect can be obtained by providing both.

In the present invention, inclined plates positioned at both left and right ends of the inclined plate sedimentation device 1 are provided so that the solids settled on the inclined plate 2 having a lower end near the restraining plate 31 can fall downward from the lower end. 2 to the restraining plate 31, a predetermined gap is interposed. Normally, the distance between the inclined plate sedimentation device 1 and the side wall 11b of the sedimentation tank 11 is about 100 mm to 400 mm. Therefore, within this range, after obtaining the effect of suppressing sloshing by attaching the suppression plate 31 to the inclined plate settler 1, the lower ends of the inclined plates 2 positioned at the left and right ends of the inclined plate settler 1 and the suppression plate 31 The gap is preferably 40 mm to 250 mm in order for the solid matter to drop downward from the gap. In addition, when viewed from the horizontal direction, the upper end of the restraining plate 31 may reach the upper end of the uppermost inclined plate 2, and the lower end thereof may reach the lower end of the lowermost inclined plate 2. In the direction of water flow, It is sufficient that the front end reaches the front end of the front-stage inclined plate 2 and the rear end reaches the rear end of the rear-stage inclined plate 2 . That is, when viewed from a direction perpendicular to the water flow direction F, it is sufficient that the suppression plate 31 does not overlap the inclined plate 2 so that the inclined plate 2 cannot be seen.

The suppressing plate 31 may be attached to the pillars 5 arranged on both the right and left sides of the inclined plate sedimentation device 1 via the attachment members 32 . Therefore, it can be easily attached to the existing inclined plate sedimentation device 1 as well. The mounting member 32 is not particularly limited, and commercially available stainless steel or aluminum hardware is preferably used. Alternatively, both ends of the support frame 3 may be extended and the restraining plates 31 may be attached to the ends thereof.

Further, in the present invention, the breakwater plate 6 preferably shields from the upper end of the inclined plate 2 to the water surface in order to prevent the growth of sloshing water waves. Therefore, the lower end of the breakwater plate 6 is at the same position as the upper end of the uppermost inclined plate 2 of the inclined plate settling device 1 or at a lower position, and the upper end of the inclined plate 2 It is preferable that the side and the lower end side of the breakwater plate 6 overlap each other. In addition, it is preferable that the upper end of the breakwater plate 6 is positioned as high as possible above the water surface so that the sloshing water wave does not grow. If there is, the breaker plate 6 may be damaged by a slight shake, or vibration may be transmitted from the suspension member 21 to the breaker plate 6 . Therefore, it is preferable that the space between the upper end of the breakwater plate 6 and the lower end of the suspension member 21 (H in FIG. 4(a)) is approximately 1 cm to 3 cm.

The breakwater plate 6 is preferably arranged corresponding to the length of the inclined plate sedimentation device 1 in the direction parallel to the water flow direction F, and more preferably inclined in the direction parallel to the water flow direction F. It preferably protrudes forward and backward from the end of the plate sedimentation device 1 . Moreover, as shown in FIGS. 1 and 2, when a plurality of inclined plates 2 are arranged in the water flow direction F, it is preferable that the breakwater plate 6 is continuous over the plurality of such plates. .

A plurality of breakwater plates 6 may be arranged at appropriate intervals within a range that prevents the growth of sloshing water waves. As shown in FIGS. can be installed. Preferably, the breakwater plates 6 may be arranged at a pitch of about 50 cm to 150 cm in the direction orthogonal to the water flow direction F, and the spacing between the hanging bolts 22, 22 adjacent to the direction orthogonal to the water flow direction F is too wide. In that case, the hanging bolts 22 or rod-shaped members similar to the hanging bolts 22 may be separately attached to the hanging members 21 as mounting members for the wave breaking plate 6 at the position where the wave breaking plate 6 is desired to be arranged.

FIG. 4(a) shows an enlarged view of the hanging bolt 22 and its surroundings in FIG. 1, and FIG. 4(b) shows an end view of the A-A' portion in FIG. 4(a). In this example, the wave breaker 6 is attached to the suspension bolt 22 using a U bolt 7 passing through the wave breaker 6 . In FIG. 4, 8 is a nut for fixing the U-bolt 7. As shown in FIG. 4(a), 23 is a stopper for preventing the support frame 3 hooked on the tip of the suspension bolt 22 from coming off the suspension bolt 22. As shown in FIG. In this way, the work of attaching the breakwater plate 6 to the inclined plate sedimentation device 1 is easy because it is only necessary to attach the breakwater plate 6 to the suspension bolts 22, and can be performed without stopping the water treatment. . Also, when replacing the breakwater plate 6, it is easy to remove, and it is possible to replace the breakwater plate 6 even during water treatment.

Materials for the suppressing plate 31 and the breakwater plate 6 used in the present invention are not particularly limited, but materials that are resistant to UV deterioration are preferable because they are exposed to sunlight. A resin material such as terephthalate) or SUS is preferably used.

As shown in FIG. 1, when the breakwater plate 6 is attached to the suspension bolts 22, at the intermediate portion of the two suspension bolts 22, 22 adjacent in the water flow direction F, the wave generated by the earthquake causes breakage. The plate 6 may be bent, deformed, twisted or cracked. Therefore, in order to prevent these, a reinforcing material may be used. FIG. 7 schematically shows the configuration of an embodiment using such a reinforcing member. FIG. 7(a) shows an enlarged view of the hanger bolt 22 and its peripheral portion of the embodiment, and FIG. 7(b) shows an end view of the B-B' portion in FIG. 7(a). In the embodiment of FIG. 7, along the longitudinal direction of the breakwater plate 6, a long plate-like reinforcing member 9 is provided between the hanging bolt 22 and the breakwater plate 6 and between the breakwater plate 6 and the nut. 8, and the suspension bolt 22 and the breakwater plate 6 are attached integrally with the U bolt 7 and the nut 8. That is, a total of four reinforcing members 9 on the front and back sides are attached to one breakwater plate 6 at two upper and lower positions. As a result, the breaker plate 6 is reinforced, and even in the intermediate portions of the hanging bolts 22, 22, the breaker plate 6 is less likely to be bent, deformed, twisted, or cracked by waves caused by an earthquake.

Further, as shown in FIG. 7, by attaching the reinforcing member 9 integrally with the suspension bolt 22, the plurality of suspension bolts 22 are connected to each other below the suspension member 21 in the direction along the water flow direction F. Therefore, the restraining force of the suspension bolts 22 connected to each other integrates the inclined plate settling device 1 suspended by the suspension bolts 22, making it less likely to be distorted and less susceptible to sloshing.

Incidentally, the reinforcing member 9 may be provided only on either the front side or the back side. As the reinforcing member 9, for example, reinforcing angle steel made of SUS or resin is preferable, and the same material as the breakwater plate 6 is preferably used.

In FIGS. 1 to 3, the plurality of inclined plates 2 are attached to the support frame 3 via the fixtures 4 and integrated. is not limited to In addition, as the suspending means, if the upper end is attached to the suspending member 21 and the lower end is attached to the inclined plate sedimentation device 1, the inclined plate sedimentation device 1 can be suspended in the sedimentation tank 11. It is not limited to the suspension bolt 22.

In FIGS. 1 to 3, a plurality of inclined plates 2 are arranged in the horizontal direction to form one stage, and are arranged in two stages vertically and two rows in front and behind so that the directions of inclination are opposite to each other. is not limited to Only one stage may be used, or three or more stages may be arranged. Moreover, it is good also as one row, and it is good also as three or more rows. In the case of arranging in multiple stages, it is preferable to arrange so that the inclination directions are opposite between the upper and lower stages.

1: Inclined plate sedimentation device, 2: Inclined plate, 3: Support frame, 4: Fixture, 5: Post, 6: Breakwater plate, 7: U bolt, 8: Nut, 9: Reinforcing material, 11: Sedimentation tank , 11a: bottom, 11b: side wall, 21: suspension member, 22: suspension bolt, 23: stopper, 31: restraint plate, 32: mounting member

Claims (8)

an inclined plate sedimentation device having a plurality of inclined plates horizontally arranged at predetermined intervals so that the inclined surfaces are parallel to each other;
Suspension material suspended horizontally over the sedimentation tank,
a suspension means having an upper end attached to the suspension member and a lower end attached to the inclined plate settling device;
The inclined plate sedimentation device is suspended in the sedimentation tank via the suspension means, and a horizontal counterflow type inclined plate sedimentation system in which water flows horizontally along the surface of the inclined plate,
Above the inclined plate sedimentation device, a breakwater plate erected vertically along a direction parallel to the upper end of the inclined plate and shielding from the upper end of the inclined plate to the water surface is placed to prevent sloshing water waves. have multiple sheets spaced apart to prevent the growth of
The inclined plate sedimentation devices stand vertically along the direction of water flow, at both left and right ends as viewed from the direction of water flow, at a predetermined distance from the lower ends of the inclined plates arranged at the left and right ends. An inclined plate settling system, characterized in that it has a restraining plate that 2. The inclined plate sedimentation system according to claim 1, wherein the breakwater plate is a horizontally elongated plate-like member, and the longitudinal direction thereof is arranged parallel to the upper end of the inclined plate. 3. The inclined plate settler system according to claim 1, wherein the lower end of the breakwater plate is at a position equal to or lower than the upper end of the uppermost inclined plate of the inclined plate settler. The inclined plate sedimentation system according to any one of claims 1 to 3, wherein the upper end of the breakwater plate is positioned higher than the water surface in the sedimentation tank. The inclined plate subsidence system according to any one of claims 1 to 4, wherein the distance from the upper end of the breakwater plate to the lower end of the suspension member is 1 cm to 3 cm. 6. A tilting plate subsidence system according to any one of claims 1 to 5, characterized in that said breakwater plate is attached to said suspension means. 7. An inclined plate subsidence system according to claim 6, characterized in that elongated stiffeners parallel to the longitudinal direction of the wave breaker are attached to the wave breaker and the suspension means. 8. The tilt according to any one of claims 1 to 7, wherein the distance between the lower ends of the tilt plate located at both left and right ends of the tilt plate sedimentation device and the restraining plate is 40 mm to 250 mm. Plate sedimentation system.

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