JP2006036217A - Sloshing preventive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical sloshing preventive device capable of preventing sloshing. <P>SOLUTION: The sloshing preventive device reduces the sloshing of liquid in a storage container 2, and a horizontal sloshing preventive member 5 is provided separately from the inner wall of the storage container between a liquid level and a position separated from the inner wall of the storage container. The sloshing preventive member 5 is supported by a stay 6 erected in the storage container 2 or provided in a positionally adjustable manner in the vertical direction with respect to the stay 6. The sloshing preventive member 5 is arranged between the liquid level and the position separated inward the liquid by a buoy and a weight connected thereto. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is provided in a storage container containing a liquid such as various liquid storage tanks such as an oil tank, a water tank, an agricultural water tank, and an industrial water tank, or a liquid storage tank. The present invention relates to an anti-sloshing device.

  When the storage container containing the liquid is swung by an earthquake wave or the like, as shown in FIG. 9, a large wave is generated on the liquid surface, and a sloshing phenomenon occurs in which the large wave impacts the wall surface of the container. Examples of such earthquakes due to sloshing include (1) an oil tank fire caused by the Niigata earthquake (June 16, 1964), (2) an oil tank fire caused by the Nihonkai Chubu earthquake (May 26, 1983), (3 ) Oil tank fires due to the Tokachi-oki earthquake (September 26, 2003) are known.

  The sloshing wave height increases with the input speed (cm / sec.) Of the earthquake, and in the case of the earthquake, the period of the earthquake is long (long-period ground motion). . In particular, if the natural frequency determined by the storage container and the liquid coincides with the frequency of an earthquake or the like, severe sloshing may occur due to a resonance phenomenon, and the storage container may be damaged. Conventionally, various methods have been devised in order to prevent or suppress this severe sloshing phenomenon.

  For example, there is known a method for preventing sloshing by attaching a plate-shaped body and a resistor using a spring to a floating roof in (A) a floating roof type tank (for example, see Patent Document 1). In the case of (A), there is a problem that it cannot be applied to a fixed roof tank as it is.

  In addition, (B) a method is also known in which a bag is placed on the surface of the inner solution, and the pressure of the inner solution is increased by injecting pressurized air into the bag to increase the sloshing frequency so that it does not resonate with the tank. (For example, refer to Patent Document 2). In the case of (B), since the pressure of the internal solution increases, a pressure reducing device such as a pressure reducing valve or the like is required to increase the pressure resistance of the pipe connected to the storage container.

  Moreover, (C) the method of preventing sloshing by the plane part installed in the inner solution surface of the storage tank container inner surface is also known (for example, refer patent document 3). In the case of (C), since the wave pressure of the sloshing acts on the wall surface through the flat portion, it is necessary to reinforce the wall surface.

  Further, (D) a method of consuming energy by overflow from the L-shaped panel opening floating on the inner solution surface and the vertical movement of the panel (for example, refer to Patent Document 4). The effect of preventing sloshing in the same way as a ship floating in the sea is not expected.

  In addition, (E) a metal that accompanies the movement of liquid by fixing upper and lower perforated plates having a plurality of fluid flow holes to the inner wall of the storage tank, and disposing a plurality of metal spheres between the upper and lower perforated plates so as to roll. There is also known a method of absorbing sloshing by absorbing the kinetic energy of the liquid by moving the ball-making body (see, for example, Patent Document 5).

In the case of (E), the metal sphere is biased to one side in the horizontal direction of the liquid reservoir during the earthquake, or to the other side. There is a problem of being small. Moreover, since it is a metal sphere, when it collides with the metal inner wall surface of a storage container inner wall, there exists a problem that a metal sound will arise and noise pollution will be caused.
JP-A-9-142575 “Floating Roof Storage Tank” JP-A-8-26388 “An apparatus for preventing sloshing of liquid in a container” Japanese Patent Laid-Open No. 9-272593 “Sloshing Prevention Device and Sloshing Prevention Method” JP-A-11-301788 “Sloshing Prevention Panel” 6-76191 “Sloshing prevention device”

As described above, the method (A) is limited to a floating roof tank, and in order to be applied to a fixed roof tank, it is necessary to install a floating roof-like structure in the tank, and there is a problem that costs increase. .
In addition, the method (B) has a problem that it is difficult to apply a huge bag for water and agricultural water storage tanks that repeatedly fluctuate a large water level, and the cost is high. The method (C) has a problem that the installation position of the flat portion cannot be specified in a water tank in which the water level fluctuation is large and the water level is not constant.

In the method (D), the panel is floating on the surface of the inner solution, and there is a problem that the effect of preventing sloshing cannot be expected as much as a ship floating in the waves.
In the method (E), when the metal sphere is biased, there is a problem that the energy absorption effect is small for the other portions. Moreover, since it is a metal sphere, when it collides with the metal inner wall surface of a storage container inner wall, there exists a problem of producing a noise pollution.

As a result of trial and error of arranging various anti-sloshing members in the model storage container in order to prevent liquid sloshing, the present inventor has provided the anti-sloshing member in the liquid from the liquid level in the model storage container. The inventors have found that sloshing can be prevented by this and completed the present invention.
It is an object of the present invention to provide an economical anti-sloshing device that can advantageously solve the conventional problems and prevent the anti-sloshing with a simple structure.

The anti-sloshing device according to the first aspect of the invention is a anti-sloshing device that reduces the anti-sloshing of the liquid in the storage container, and the anti-sloshing member that faces sideways between the liquid level and the position spaced downward from the liquid surface. Is provided so as to be kept away from the inner wall of the storage container.
According to a second aspect, in the anti-sloshing device according to the first aspect, the anti-sloshing member is supported by a support column erected in the storage container.
According to a third aspect, in the anti-sloshing device according to the second aspect, the anti-sloshing member is provided so that the position of the anti-sloshing member can be adjusted in the vertical direction with respect to the support column.
According to a fourth aspect, in the anti-sloshing device according to the first aspect, the anti-sloshing member is disposed between the liquid surface and the position away from the liquid surface by the floating body and the weight connected thereto. It is characterized by.
In the fifth invention, in the sloshing prevention device according to any one of the first invention to the fourth invention, the sloshing prevention member is either a flat plate or a flat plate having a side opening concave portion or a hole penetrating vertically. It is made into the member, It is characterized by the above-mentioned.
According to a sixth aspect, in the anti-sloshing device according to any one of the first to fourth aspects, the anti-sloshing member is a skeleton structure plate having a side opening recess or a hole penetrating vertically. And

According to the first aspect of the present invention, there is provided a sloshing prevention device for reducing sloshing of the liquid in the storage container, wherein the sideways sloshing prevention member is disposed on the inner wall of the storage container between the liquid level and the position spaced downward from the liquid surface. With a simple structure provided so as to maintain a state away from the sloshing, sloshing due to resonance such as during an earthquake can be reliably prevented, or sloshing that is not resonating can be reduced or prevented. Further, since the sloshing wave height and its hydraulic pressure can be reduced without changing the sloshing frequency, there is no need to reinforce the storage container, which is economical.
According to the second aspect of the present invention, the anti-sloshing member can be easily supported by the support column provided upright in the storage container, and the elasticity of the support column when the anti-sloshing member receives an action force due to the wave of the liquid in the container. The container can be tilted by bending deformation, and a large reaction force is not applied to the container.
According to the third invention, even if the liquid level changes due to the discharge of the liquid in the storage container or the transfer of the liquid into the storage container, the position of the anti-sloshing member is adjusted and the anti-sloshing position is arranged. be able to.
According to the fourth aspect of the invention, the anti-sloshing member can be accurately arranged at a position that is easily located below the liquid surface using the floating body and the weight. Moreover, even if the liquid level changes due to the supply and drainage of the liquid in the storage container, the liquid level can be responsive to a predetermined position below the liquid level.
According to the fifth aspect of the present invention, the sloshing prevention member can be reduced in weight, and manufacturing and transfer installation work are facilitated.
According to the sixth aspect of the present invention, the anti-sloshing member has a framework structure, so that not only can it be further reduced in weight compared to the plate-like case, but also small parts can be conveyed from a human hole or the like into a storage container. Since it can be assembled and installed, the assembly and installation work is facilitated.

(First embodiment)
1 (a) and 1 (b) show a sloshing prevention device 1 according to a first embodiment of the present invention. In this embodiment, water, oil or other liquid contained in a storage container 2 is shown. The sloshing prevention member 5 which consists of a horizontal disk-shaped board body is arrange | positioned in the position away from the liquid level 4 of 3 at the same time, The said sloshing prevention member 5 was arrange | positioned concentrically in the center part It is attached to the upper end of the column 6.

  As a mounting structure between the support column 6 and the anti-sloshing member 5, a flange may be provided at the upper end portion of the support column and a female screw hole may be provided in the anti-sloshing member 5 and fixed with bolts. The upper end portion of the support column is welded to the anti-sloshing member 5. It may be fixed by a rigid coupling means such as fitting the upper end of the column to the anti-sloshing member 5 and welding, or elastic by fixing an elastic body such as a rubber plate to the column upper end flange. A coupling means may be used, and it is desirable that the anti-sloshing member 5 be restored before and after the earthquake so that excessive stress is not applied to the support column 6 or the storage container 2. Further, it is desirable that the support column 6 has a restoring property to return to the initial vertical state because excessive stress does not act on the support column 6 or the storage container 2.

  In the illustrated embodiment, a seat plate 9 is integrally provided by welding or the like at the lower end portion of the support column, and the seat plate 9 is fixed to the bottom plate 10 of the storage container 2 by welding or the like to constitute the anti-sloshing device 1. . The natural frequency of the anti-sloshing device 1 is set to be different from the natural frequency of the storage liquid 3 and the storage container 2.

  As shown in FIG. 2, the disk-shaped anti-sloshing member 5 has a composite structure in which the anti-sloshing member 5 is used as a hollow member and filled with a filler 11 such as foamed resin or stored liquid as shown in FIG. In this case, the buoyancy of the anti-sloshing member 5 can be adjusted by the filler 11.

  Note that the anti-sloshing device 1 of the present invention can be applied to a wide range of storage containers such as a large-sized oil tank or the like from a small storage tank for storing liquid, and therefore when applied to a anti-sloshing device for a small storage container. Alternatively, the column 6 and the anti-sloshing member 5 may be manufactured by integral molding or the like.

  In the anti-sloshing device 1 configured as described above, the anti-sloshing member 5 oscillates behind the oscillation of the liquid due to the oscillation of the stored liquid 3 before the occurrence of sloshing due to resonance such as during an earthquake, The strut 6 that supports the anti-sloshing member 5 also tilts and swings within the elastic deformation region, that is, the anti-sloshing member 5 tilts and swings alone or together with the post 6 to prevent sloshing due to resonance and at the time of resonance. It functions as the anti-sloshing device 1 that prevents or reduces other sloshing. Further, even if the support 6 is elastically deformed and deformed, the state where the support 6 is separated from the inner wall of the storage container 2 is maintained. The anti-sloshing mechanism will be described later.

As the anti-sloshing mechanism that functions in this way, the following (1) to (3) are conceivable.
(1) By installing the anti-sloshing member 5, the anti-sloshing member 5 acts as a baffle plate, and the anti-sloshing member 5 is divided so that the stored liquid is cut above and below it. It becomes difficult for a liquid (for example, water) to be supplied onto the anti-sloshing member 5.
(2) The anti-sloshing member 5 is displaced by receiving a force due to the wave pressure caused by the sloshing of the stored liquid in the container. The anti-sloshing member 5 starts following the movement of the stored liquid with a slight delay due to slipping or the like. Therefore, a phase difference is generated between the period of the sloshing and the period of the sloshing prevention member 5, and the sloshing inhibits free vibration.

(3) Moreover, the effect | action by the reflected wave accompanying tilting of the anti-sloshing member 5 can also be expected. Furthermore, as in the embodiment described later, when a recess or a through hole penetrating the anti-sloshing member 5 is formed, energy is consumed when the liquid passes through the hole, so that energy necessary for wave growth is insufficient. In addition, the liquid passing through the hole interferes with the liquid on the anti-sloshing member 5, and the energy necessary for wave growth is insufficient.

  Note that, as shown in FIG. 8, if the flat plate 31 that is not held on the surface of the stored liquid 3 is simply floated, the flat plate 31 is synchronized with the movement of the waves, as shown in FIG. Therefore, the wave height is hardly reduced, and the flat plate 31 may collide with the inner wall of the storage container 2 and damage the wall of the storage container 2.

  In the first embodiment, the anti-sloshing member 5 is installed at a position separated downward from the liquid level 4 of the stored liquid 3. However, the anti-sloshing member 5 is moved from the liquid level 4 of the stored liquid 3 to the inside of the stored liquid. What is necessary is just to arrange | position to the predetermined position below.

Regarding the position below the anti-sloshing member 5, the stored liquid 3 can be divided into an upper part that becomes a movable liquid part during horizontal vibration such as an earthquake and a fixed liquid part that hardly moves during horizontal vibration. In the case of a storage container having a liquid depth (in the case of water, meaning water depth), the anti-sloshing member 5 may be disposed in the movable liquid portion. Among the movable liquid parts, it is desirable that the movable liquid part be provided at a position from the liquid surface at the time of the still liquid surface (meaning the still water surface in the case of water) to a depth substantially corresponding to the wave height generated by the sloshing. Even at the position, the anti-sloshing effect is high if it is disposed at a depth substantially corresponding to the wave height generated by the sloshing. The wave height d _max (see FIG. 9) at the time of sloshing can be calculated by a conventional formula such as a Hausner.

  In order to prevent the sloshing prevention member 5 from colliding with the storage container inner wall surface 12, it is necessary to provide the disk-shaped sloshing prevention member 5 at a position sufficiently away from the storage container inner wall surface 12. Therefore, the outer diameter of the disk-shaped sloshing prevention member 5 is larger than the inner diameter of the storage container 2 so that the sloshing prevention member 5 does not come into sufficient contact with the inner wall surface of the storage container 2 even when the sloshing prevention member 5 is horizontally displaced due to the elastic deflection of the column 6. Carefully set the design so that the dimensions are small.

  The materials of the anti-sloshing member 5 and the column 6 are appropriately set depending on the properties of the storage liquid 3 in the storage container 2. For example, if the stored liquid 3 is clean water, a material such as steel that does not affect the water quality may be selected. As a method for supporting the flat anti-sloshing member 5, the storage container 2 such as a tank has a roof-supporting column installed in the center of the tank. Alternatively, a separately installed inflow pipe may be used, or a new support may be installed.

(Second Embodiment)
3 (a) and 3 (b) show the anti-sloshing device 1 according to the second embodiment of the present invention. The anti-sloshing device 5 has a plurality of through-holes that vertically penetrate the anti-sloshing member 5 at equal angular intervals in the circumferential direction. 13 is provided to increase the void ratio of the anti-sloshing member 5 and to reduce the weight of the anti-sloshing prevention member 5, thereby facilitating the transport installation work.

  As described above, when the through hole 13 penetrating the anti-sloshing member 5 is opened to increase the porosity, energy is consumed when the stored liquid 3 passes through the through hole 13, so that the energy necessary for wave growth is insufficient. To come. Further, the stored liquid passing through the through hole interferes with the stored liquid on the anti-sloshing member 5, and the energy necessary for wave growth becomes insufficient. Further, by providing the through-hole 13, the direction of the stored liquid 3 is forcibly changed when passing through the through-hole 13, and the action of canceling waves by interfering with the stored liquid on the upper side of the anti-sloshing member 5 also occurs. Moreover, the effect | action by the reflected wave accompanying tilting of the anti-sloshing member 5 can also be expected. Since other configurations are the same as those in the above-described embodiment, the same portions are denoted by the same reference numerals and the description thereof is omitted.

(Third embodiment)
4 (a) and 4 (b) show the anti-sloshing device 1 of the third embodiment of the present invention. In this embodiment, not only the through-hole 13 but also the anti-sloshing member 5 penetrates up and down. It is an embodiment for showing that a concave portion that opens to the side may be used, and the side portions such as a plurality of semicircular cutouts that penetrate the sloshing prevention member 5 vertically at equal angular intervals in the circumferential outer peripheral edge portion. In this embodiment, an opening recess 14 is provided. In this manner, the side opening recess 14 such as a notch may be provided in the peripheral edge portion, and the anti-sloshing member 5 having a reduced porosity and a reduced weight may be used. Such a side opening recess 14 may be provided in the anti-sloshing member 5 of the embodiment having the through hole 13.

(Fourth embodiment)
5 (a) and 5 (b) show a sloshing prevention device 1 according to a fourth embodiment of the present invention, in which a strut insertion hole 15 penetrating in the vertical direction is provided at the center of the sloshing prevention member 5 and a lower portion. A bolt insertion lateral hole 16 is provided on the support 6 supporting the sloshing prevention member 5, and a bolt insertion lateral hole 17 is provided on the support 6 supporting the sloshing prevention member 5 in the vertical direction. The sloshing prevention member 5 is provided so that the position of the sloshing prevention member 5 can be adjusted by a nut 19 that is inserted into the bolt insertion hole 17 at an optimum position of the column 6 and screwed into the bolt 18. In the case of a large anti-sloshing member 5, although not shown in the drawing, a position adjusting device such as a hydraulic jack is attached to one of the support 6 and the anti-sloshing member 5, and connected to the other, You may make it adjust the position of the sloshing prevention member 5 in the up-down direction. In this case, the position adjustment device may be automatically driven by a detection device that detects the liquid level of the stored liquid to adjust the position of the sloshing prevention member 5.

  With such a configuration, the anti-sloshing member 5 can be installed at an optimum position according to the liquid level in the storage container 2, and the anti-sloshing effect can be enhanced.

(Fifth embodiment)
6 (a) and 6 (b) show a sloshing prevention device 1 according to a fifth embodiment of the present invention. In this embodiment, the anti-sloshing member 5 is a frame structure plate having a frame structure plate shape. It is a form that is lighter and easier to assemble.

  More specifically, as shown in FIG. 6 (b), the anti-sloshing member 5 includes an outer annular member 21 in which a plurality of arc-shaped members 20 are arranged in a circle and integrated into a circle by bolts or the like, and a gap therebetween. An inner annular member 22 in which a plurality of arc-shaped members 20 are arranged in a circle and integrated with a bolt or the like, and a column connecting member 23 at the center with an interval therebetween is provided as an outer annular member. The connecting beam member 24 is arranged between the inner ring member 22 and the inner ring member 22 or between the inner ring member 22 and the column connecting member 23 and integrated with a bolt or the like to form the double ring sloshing prevention member 5. Yes. As the material of the anti-sloshing member 5, various metal materials such as steel, synthetic resin materials, or composite materials thereof may be used depending on the chemical properties of the stored liquid.

  When the inner annular member 22, the outer annular member 21, the connecting beam member 24, and the column connecting member 23 are configured, the foamed synthetic resin or the filler 11 made of the same material as the storage liquid 3 is filled in the rectangular cross section to reduce the weight. Or the buoyancy of the anti-sloshing member 5 can be adjusted accordingly.

  In the case of the anti-sloshing member 5 having the above-described skeleton structure, short parts such as the arc-shaped member 20 or the connecting beam member 24 constituting the sloshing prevention member 5 are put into the container from a human hole or the like provided in a storage container such as a tank. Since it can be carried in and out, it can be easily transported into the storage container and assembled on site in the storage container at low cost.

  Note that, as the arc-shaped member 20 and the connecting beam member 24, a commercially available steel pipe material is used, and when a connecting flange is appropriately provided on the circumferential end of the arc-shaped member 5 and inside or outside in the radial direction, Furthermore, the anti-sloshing member 5 can be manufactured at low cost.

(Sixth embodiment)
FIG. 7 shows the anti-sloshing device 1 of the sixth embodiment of the present invention in which the anti-sloshing member 5 is a movable floating type. In this embodiment, the anti-sloshing preventing member 5 is directly placed on the upper side of the disk-like anti-sloshing member 5. Alternatively, as shown in the drawing, one or a plurality of floating bodies 28 are connected via a connecting member 27 such as a connecting strip or a connecting bar, and the lower side of the sloshing prevention member 5 is directly or via a connecting member 27. A weight 29 is arranged, and the sloshing prevention member 5 is placed in a liquid at a predetermined distance away from the liquid surface in a state where the floating body 28, the weight 29 and the sloshing prevention member 5 are suspended. Has been. The portion of the anti-sloshing member 5 may be a flat plate as shown in FIGS. 1 and 3, a composite structure as shown in FIG. 2, or a frame structure plate as shown in FIG.

  Such a configuration is advantageous when a supporting column cannot be installed, and the sloshing prevention member 5 made of a flat plate is located at a position from the stored liquid level 4 (the liquid level at the time of still water) to a position approximately below the sloshing wave height dimension. The floating body 28 and the weight 29 considering the weight balance may be attached to the necessary number of anti-sloshing members so as to be installed.

  Further, the outer peripheral portion of the anti-sloshing member 5 and the inner surface side of the storage container 2 are connected to each other by a connecting strip 30 such as a wire rope or a chain, or a spring material (a spring plate, a compression coil spring, or a tension). The center of the storage container 2 is centered (biased) by the weight of the connecting strip 30 or the biasing force of the spring material, and the sloshing prevention member 5 is It is designed to keep a distance. The connecting strip 30 or the spring material can have a slightly longer dimension than the difference between the inner diameter radius of the storage container 2 and the radial dimension of the anti-sloshing member 5, or a length dimension larger than that. In the case of a spring plate, the width dimension is appropriately set. The anti-sloshing member 5 can prevent the storage container 2 from colliding with the connecting strip 30 or the spring plate. The anti-sloshing member 5 and the storage container 2 are connected to each other by a spring-biased elastic connecting member disposed at equal angular intervals so that the center of the anti-sloshing member 5 is the center of the storage container 2. It is also possible to maintain the state away from the inner wall surface of the storage container 2. In addition, although illustration is abbreviate | omitted, you may install buffer materials, such as a fender, in the peripheral part by the side of the anti-sloshing member 5. FIG.

  When a plurality of floating bodies 28 and weights 29 are attached to the plate-shaped anti-sloshing member 5 shown in FIG. 7, they are attached at equal angular intervals such as 120 ° or symmetrically at equal angular intervals. It only has to be attached. The installation positions and the number of installations of the floating body 28 and the weight 29 are appropriately set by design in consideration of the weight of the sloshing prevention member 5 and the like.

  As the floating-type anti-sloshing member 5, the anti-sloshing member 5 of a frame structure plate or a double annular frame structure plate as shown in FIG. 6 may be used.

  In the anti-sloshing member 5 having such a form, although not shown in the drawings, the floating body 28 and the weight 29 are arranged on the outer annular member 21 or the inner annular member 22 symmetrically at equal angular intervals or the like, and are directly attached or connected. What is necessary is just to connect via the strip | belt body 27 and arrange | position to the position away from the liquid level in the storage container 2 below.

Next, a description will be given of the result of a shaking table experiment using the anti-sloshing device of the present invention as a model. The storage container which installed the sloshing prevention member 5 modeled in FIG. 10 is shown.
As a storage container, a model of the storage container 2 made of an acrylic resin tube having an outer diameter of 600 mm, an inner diameter of 580 mm, a depth of 800 mm, water as a storage liquid and a water depth of 500 mm was installed on a shaking table, and the anti-sloshing member 5 was provided. In the case and the case where the anti-sloshing member 5 is not provided as a comparative example (normal case), a 2 gal sine wave excitation was applied.
The sloshing prevention member 5 has two types, ie, a circular plate shape shown in FIGS. 1 and 3 and a double-ring frame structure plate shown in FIG.
When the anti-sloshing member 5 is a flat plate, the flat plate has a diameter of 345 mm, and the flat plate has two thicknesses of 1 mm and 7 mm. The flat plate void ratio (the ratio of the total plane area of the through-hole 13 to the plane area simply multiplied by the diameter of the flat plate) is changed to 0%, 25%, 50%, and 67.7%. A flat plate was prepared.
The installation depth of each flat plate and frame structure plate-shaped sloshing prevention member 5 was set to 2 cm from the water surface of about 20% of the assumed sloshing wave height.
Further, the anti-sloshing member 5 of the double-frame structure plate having a circular plate shape has an outer diameter of an outer annular member (outer bone) having a circular cross section of 335 mm, an inner diameter of 304 mm, and an inner annular member (inner bone) having a circular cross section. The outer diameter was 224 mm and the inner diameter was 193 mm.
In either case, the anti-sloshing member 5 was fixed to the upper part of a steel rod column 6 having a diameter of 5 mm, the upper end of the column 6 was slightly protruded from the water surface, and a rod having a total length of 500 mm was fixed to the mounting bracket).
The lower part of the column 6 was fixed to the bottom plate of the storage container 2 via the mounting bracket.
Results of shaking table tests for the case of the anti-sloshing member 5 of the above-described various flat plates and the frame structure plate (simply referred to as the frame in Table 1 and FIG. 11) and the case where the anti-sloshing member 5 is not provided as a comparative example. Is shown in Table 1 and FIG. Further, when the anti-sloshing member 5 is provided, the sloshing due to the resonance can be reliably prevented without causing the sloshing due to the resonance.
From the experimental results shown in FIG. 11 which is a bar graph of the dynamic water pressure, the wave height, and the anti-sloshing member of Table 1 and the part thereof, the wave height and the dynamic pressure due to the sloshing can be prevented by installing the flat anti-sloshing device 1. It can be seen that it can be significantly reduced (about 40% or less) compared to the case where no device is provided (in the case of normal).
Further, it can be seen that the smaller the porosity, if the flat plate thickness is the same, and the thicker the thickness, the better reduction effect is the same. Furthermore, it can be seen that the sloshing frequency does not change and does not affect the basic dynamic behavior.

Further, when the anti-sloshing device 1 of the present invention is used, the sloshing frequency is changed irrespective of the type of the storage container of the floating roof type or the fixed roof type, and regardless of the planar shape of the circular or square storage container. In fact, there is almost no difference in the reduction effect due to the direction of the earthquake. Further, there is no need to reinforce the storage container or the piping to be connected, and it is economical because it is not necessary to cover the entire liquid surface as in the prior art, and there is no possibility that the flat device collides with the wall surface of the storage container.

  The present invention can be applied to a storage container of any of the above-ground type, underground type, or semi-underground type, and the storage container itself has a shape such as a plane cylindrical shape, a rectangular parallelepiped shape, or a spherical shape. Can be applied to containers.

  In the case of carrying out the present invention, in the case of a flat rectangular storage container, a plurality of the anti-sloshing devices of the present invention may be provided in parallel at intervals in a plane.

  In the case of carrying out the present invention, in the case of a suspension type anti-sloshing device using a supporting column or a floating body and a weight, a plurality of anti-sloshing members may be provided so as to be vertically spaced or overlapped.

When practicing the present invention, when the anti-sloshing member 5 is in the form of a frame structure plate, it may be a frame structure plate having a side opening recess 14.

BRIEF DESCRIPTION OF THE DRAWINGS The sloshing prevention apparatus of 1st Embodiment of this invention is shown, Comprising: (a) is a vertical front view which shows the state provided in the storage tank, (b) is a top view of (a). It is a vertical front view which shows the deformation | transformation form of the sloshing prevention member in FIG. The sloshing prevention apparatus of 2nd Embodiment of this invention is shown, Comprising: (a) is a longitudinal front view which shows the state provided in the storage tank, (b) is a top view of (a). The sloshing prevention device of 3rd Embodiment of this invention is shown, Comprising: (a) is a longitudinal front view which shows the state provided in the storage tank, (b) is a top view of (a). The sloshing prevention apparatus of 4th Embodiment of this invention is shown, Comprising: (a) is a longitudinal front view which shows the state provided in the storage tank, (b) is a top view of (a). The sloshing prevention device of 5th Embodiment of this invention is shown, Comprising: (a) is a longitudinal front view which shows the state provided in the storage tank, (b) is a top view of (a). The sloshing prevention device of 6th Embodiment of this invention is shown, Comprising: (a) is a longitudinal front view which shows the state provided in the storage tank, (b) is a top view of (a). (A) is a longitudinal front view showing the behavior when a floating flat plate is provided on the liquid surface, and (b) is a plan view of (a). (A) is a longitudinal front view showing a state where sloshing has occurred, (b) is a plan view of (a). It is a figure which shows the model of the storage container which installed the anti-sloshing member. It is explanatory drawing made into the bar graph about the result of having performed the shaking table test about the case where a sloshing prevention member is provided in a model storage container, and the case where it does not provide.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sloshing prevention apparatus 2 Reservoir 3 Reservoir 4 Liquid surface 5 Sloshing prevention member 6 Post 9 Seat plate 10 Bottom plate 11 Filler 12 Inner wall surface 13 Through hole 14 Recess 15 Post insertion hole 16 Bolt insertion side hole 17 Bolt insertion side hole Hole 18 Bolt 19 Nut 20 Arc-shaped member 21 Outer annular member 22 Inner annular member 23 Column connecting member 24 Connecting beam member 27 Connecting member 28 Floating body 29 Weight 30 Connecting strip 31 Flat plate

Claims (6)

  Anti-sloshing device that reduces sloshing of the liquid in the storage container, and keeps the state of the anti-sloshing member facing away from the inner wall of the storage container between the liquid level and the position spaced downward from the liquid surface. An anti-sloshing device characterized by being provided.   2. The anti-sloshing device according to claim 1, wherein the anti-sloshing member is supported by a support column erected in the storage container.   The anti-sloshing device according to claim 2, wherein the anti-sloshing member is provided so that the position of the anti-sloshing member can be adjusted in the vertical direction.   2. The anti-sloshing device according to claim 1, wherein the anti-sloshing member is disposed between the liquid surface and a position away from the liquid surface by a floating body and a weight connected to the anti-sloshing member.   5. The sloshing prevention member is a flat plate member of any one of a flat plate or a flat plate having a lateral opening recess or a hole penetrating vertically. The anti-sloshing device as described.   The sloshing prevention device according to any one of claims 1 to 4, wherein the sloshing prevention member is a frame structure plate having a side opening concave portion or a hole formed by a hole penetrating vertically.

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