Damping Device

Abstract

To provide a damping device that improves earthquake resistance and safety of a liquid storage tank against a bulging phenomenon.SOLUTION: There is provided a damping device 1 arranged in a storage tank for liquid with a rectangular cross-sectional shape, including: a first fixing part 2 fixed to a first side S1 of an inner wall of the liquid storage tank; a second fixing part 3 fixed to a second side surface S2 in the liquid storage tank; and a connecting member 6 connecting the first fixing part 2 and the second fixing part 3, in which the first side S1 and the second side S2 are adjacent to each other, the first fixing part 2 and the second fixing part 3 having a hollow elastic member 4 and a support member 5 that supports the hollow elastic member 4, and the connecting member 6 connects the hollow elastic member 4 of the first fixing part 2 and the hollow elastic member 4 of the second fixing part 3.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a damping device disposed within a storage tank for a liquid. [Background technology]

[0002] Sloshing is a known phenomenon in which liquid storage tanks such as water tanks are destroyed by earthquake motion. Sloshing occurs when the natural vibration frequency of the liquid in the tank coincides with the earthquake motion, causing the liquid to sway violently due to resonance, resulting in damage mainly to the tank's ceiling or upper side panels.

[0003] Furthermore, analysis of the destruction of tanks caused by recent earthquakes has revealed that tanks can be destroyed not only by the above-mentioned sloshing phenomenon, but also by a phenomenon called bulging. Bulging is a phenomenon in which seismic motion causes the liquid in a tank to vibrate as a single mass (mass body) in conjunction with the tank's side panels. The hydrostatic pressure of the liquid in a tank is proportional to its depth, so it is higher near the bottom of the tank. Therefore, when bulging occurs, stress tends to concentrate at the bottom of the tank, increasing the risk of damage to the side panels and corners at the bottom of the tank.

[0004] As a countermeasure against this bulging phenomenon, for example, a method of disposing a damping device in a liquid storage tank as described in Patent Document 1 below has been considered. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-117269 A Summary of the Invention [Problem to be solved by the invention]

[0006] The damping device described in Patent Document 1 mentioned above can efficiently absorb the kinetic energy of the panel of a liquid storage tank attempting to expand outward due to the bulging phenomenon, thereby preventing damage to the tank. However, when the panel of a liquid storage tank attempts to collapse inward, the effect of damping the kinetic energy is not necessarily sufficient, and there is still room for improvement.

[0007] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a damping device that improves the earthquake resistance and safety of a liquid storage tank against the bulging phenomenon. [Means for solving the problem]

[0008] The damping device of the present invention is a damping device arranged in a liquid storage tank having a rectangular cross-sectional shape, a first fixing part fixed to a first side surface of an inner wall of the liquid storage tank, a second fixing part fixed to a second side surface inside the liquid storage tank, and a connecting member connecting the first fixing part and the second fixing part, the first side and the second side are adjacent to each other; The first fixing portion and the second fixing portion each include a hollow elastic member and a support member that supports the hollow elastic member, The connecting member connects the hollow elastic member of the first fixing portion and the hollow elastic member of the second fixing portion. The hollow elastic member of the first fixing portion and the hollow elastic member of the second fixing portion mutually transmit kinetic energy. It is characterized by: In the present invention, it is preferable that the connecting member includes a frame member spanning the hollow elastic member of the first fixing portion and the hollow elastic member of the second fixing portion.

[0009] According to this configuration, when kinetic energy due to earthquake motion or the like is applied to the first side surface of the inner wall of the liquid storage tank, causing the first side surface to bulge outward or to dent inward, the kinetic energy is received mainly by the first fixed part, causing the hollow elastic member of the first fixed part to elastically deform. When the hollow elastic member elastically deforms, resistance is generated and the kinetic energy is converted into thermal energy, thereby making it possible to damp vibrations due to earthquake motion or the like.

[0010] In addition, when kinetic energy due to earthquake motion, etc. is applied to the second side of the liquid storage tank, as in the case of the first fixed part described above, the second fixed part mainly receives the kinetic energy, and the hollow elastic member of the second fixed part elastically deforms to dampen the vibrations due to earthquake motion, etc.

[0011] In other words, when kinetic energy due to seismic motion or the like is applied to both the first and second sides of the inner wall of the liquid storage tank, both the hollow elastic member of the first fixed part and the hollow elastic member of the second fixed part will elastically deform, thereby damping vibrations caused by the seismic motion, etc.

[0012] Therefore, kinetic energy due to earthquake motion, etc. is not concentrated in one hollow elastic member of the damping device, but is dispersed to two hollow elastic members, making it possible to efficiently damp vibrations due to earthquake motion, etc. As a result, the bulging phenomenon is weakened, making the liquid storage tank less likely to be damaged not only when the side of the liquid storage tank bulges outward, but also when the side of the liquid storage tank tries to collapse inward.

[0013] In the present invention, it is preferable that the first side surface and the second side surface form four corners of an inner wall of the liquid storage tank.

[0014] According to this configuration, the damping device is installed at the corners of the inner wall of the liquid storage tank, making the installation method easy and more effective in preventing damage at the corners where stress due to the bulging phenomenon is likely to concentrate.

[0015] The damping device of the present invention is a damping device arranged in a liquid storage tank having a rectangular cross-sectional shape, a first fixing part fixed to a first side surface of an inner wall of the liquid storage tank, a second fixing part fixed to a second side surface inside the liquid storage tank, and a connecting member connecting the first fixing part and the second fixing part, the first side and the second side are adjacent to each other; The first fixing portion and the second fixing portion each include a hollow elastic member and a support member that supports the hollow elastic member, the connecting member connects the hollow elastic member of the first fixing portion and the hollow elastic member of the second fixing portion, A plurality of stages are arranged vertically in the liquid storage tank. It is characterized by:

[0016] According to this configuration, when kinetic energy due to earthquake motion or the like is applied to the first side surface of the inner wall of the liquid storage tank, causing the first side surface to bulge outward or to dent inward, the kinetic energy is received mainly by the first fixed part, causing the hollow elastic member of the first fixed part to elastically deform. When the hollow elastic member elastically deforms, resistance is generated and the kinetic energy is converted into thermal energy, thereby making it possible to damp vibrations due to earthquake motion or the like. In addition, when kinetic energy due to earthquake motion, etc. is applied to the second side of the liquid storage tank, as in the case of the first fixed part described above, the second fixed part mainly receives the kinetic energy, and the hollow elastic member of the second fixed part elastically deforms to dampen the vibrations due to earthquake motion, etc. In other words, when kinetic energy due to seismic motion or the like is applied to both the first and second sides of the inner wall of the liquid storage tank, both the hollow elastic member of the first fixed part and the hollow elastic member of the second fixed part will elastically deform, thereby damping vibrations caused by the seismic motion, etc. Therefore, kinetic energy due to earthquake motion, etc. is not concentrated in one hollow elastic member of the damping device, but is dispersed to two hollow elastic members, making it possible to efficiently damp vibrations due to earthquake motion, etc. As a result, the bulging phenomenon is weakened, making the liquid storage tank less likely to be damaged not only when the side of the liquid storage tank bulges outward, but also when the side of the liquid storage tank tries to collapse inward. moreover According to this configuration, vibrations caused by earthquake motions and the like can be more efficiently damped over a wider range in the vertical direction of the liquid storage tank, thereby weakening the bulging phenomenon.

[0017] In the present invention, it is preferable that the liquid storage tank is a panel-type tank formed by joining a plurality of panels, and that the first fixing portion is fixed to the joint between the panels on the first side surface, and the second fixing portion is fixed to the joint between the panels on the second side surface.

[0018] When bulging occurs in a panel-type tank, the joint between the panels may be damaged. However, with this configuration, the first fixing part and the second fixing part are fixed to the joint between the panels, reinforcing the joint, making it less susceptible to damage.

[0019] In the present invention, it is preferable that the hollow elastic member is made of a thermosetting elastomer or a thermoplastic elastomer.

[0020] In this configuration, the hollow elastic member is made of a thermosetting elastomer or a thermoplastic elastomer, making the hollow elastic member more flexible and easier to elastically deform, and thereby more efficiently damping vibrations caused by seismic activity, etc., thereby weakening the bulging phenomenon. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a plan view of a liquid storage tank equipped with a damping device; [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 13 is a side view of another embodiment of the damping device. [Diagram 5]FIG. 13 is a side view of another embodiment of the damping device. [Figure 6] FIG. 13 is a perspective view of another embodiment of a damping device. [Figure 7] FIG. 13 is a perspective view of another embodiment of a damping device. [Figure 8] 13 is a graph showing wall response displacement. [Figure 9] 13 is a graph showing wall response displacement. [Figure 10] 13 is a graph showing wall response acceleration. [Figure 11] 13 is a graph showing wall response acceleration. [Figure 12] 1 is a graph showing a rainflow analysis of wall displacement. [Figure 13] 1 is a graph showing a rainflow analysis of wall displacement. [Figure 14] 1 is a graph showing a rainflow analysis of wall response acceleration. [Figure 15] 1 is a graph showing a rainflow analysis of wall response acceleration. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] [Embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a damping device according to the present invention will be described with reference to the drawings. (Liquid storage tank) In this invention, the liquid storage tank T refers to any tank capable of containing and storing liquid L such as water, fuel, chemical liquids, etc., and whether or not it is earthquake-resistant is not particularly relevant.

[0023] An example of the liquid storage tank T to which the damping device 1 according to the present invention can be applied is a general box-shaped tank having a rectangular (square or oblong) cross-sectional shape.

[0024] The shape of the tank is not particularly limited, but may be, for example, a panel-type tank composed of a plurality of panels P as shown in Fig. 1. Examples of such a panel-type tank include a known stainless steel panel tank having a plurality of stainless steel panels and a known FRP panel tank having a plurality of fiber-reinforced plastic (FRP) panels.

[0025] There are no particular limitations on the size of the tank, and it can be used in a wide range of applications, from a typical water tank measuring, for example, 3m high x 3m wide x 3m deep, to large tanks with an effective depth of over 7m.

[0026] (Damping device) As shown in Figures 1 and 2, the damping device 1 of this embodiment includes a first fixing part 2 fixed to a first side surface S1 of the inner wall of the liquid storage tank T, a second fixing part 3 fixed to a second side surface S2 of the inner wall of the liquid storage tank T, and a connecting member 6 connecting the first fixing part 2 and the second fixing part 3.

[0027] The first side surface S1 and the second side surface S2 of the inner wall of the liquid storage tank T are adjacent to each other. For example, in the case of the liquid storage tank T having a rectangular cross-sectional shape in this embodiment, the first side surface S1 and the second side surface S2 of the inner wall are side surfaces that are approximately perpendicular to each other in a plan view.

[0028] On the other hand, if the cross-sectional shape of the liquid storage tank T is not rectangular, the first side surface S1 and the second side surface S2 of the inner wall are not necessarily perpendicular to each other in a plan view. In other words, this does not mean that the damping device 1 of the present invention cannot be applied to tanks other than liquid storage tanks having a rectangular cross section.

[0029] Moreover, it is preferable that the first side surface S1 and the second side surface S2 are parts that form a corner portion C of the inner wall of the liquid storage tank T.

[0030] In the present invention, the inner wall of the liquid storage tank T includes not only the side walls but also the ceiling and bottom. Also, while the first side surface S1 is limited to the inner wall, the second side surface S2 is not limited to only the inner wall but also includes the side surfaces of other members provided in the liquid storage tank, such as a reinforcing member formed by combining multiple vertical frames and multiple horizontal frames in a jungle gym shape.

[0031] The first fixed part 2 and the second fixed part 3 in this embodiment have the same configuration, and include a hollow elastic member 4 and a support member 5 that supports the hollow elastic member 4.

[0032] The hollow elastic member 4 in this embodiment is a cylindrical elastic member having a cross-sectional shape (see FIG. 3) that combines a semicircular portion and a rectangular portion, but is not limited to this configuration, and other cylindrical shapes, for example, having a cross-sectional shape that is simply circular or rectangular, may also be used.

[0033] Examples of materials constituting the hollow elastic member 4 include, but are not limited to, thermosetting elastomers such as rubber, or thermoplastic elastomers such as olefin-based elastomers, styrene-based elastomers, and polyvinyl chloride resin-based elastomers. However, when the damping device 1 of the present invention is applied to a water tank that stores tap water, for example, it is necessary to construct the hollow elastic member 4 from a material that does not adversely affect the quality of tap water.

[0034] The hollow elastic member 4 can be manufactured by using the above-mentioned constituent materials as materials, for example, forming them into a long and thin plate shape by a known extrusion molding method, and then cutting them into a predetermined size and shape.

[0035] The support member 5 in this embodiment includes a hollow square tube 50 having a rectangular cross section and two angle members 51 having an L-shaped cross section, and each of the two angle members 51 is fixed by a bolt and a nut to each of the two side surfaces on the short side of the cross section of the square tube 50. The angle members 51 are formed with a plurality of through holes for inserting bolts, screws, etc.

[0036] The curved surface constituting the semicircular cross-sectional portion of the hollow elastic member 4 is fixed to one side surface on the longer side of the cross-section of the square tube 50 of the support member 5 by means of a bolt and a nut.

[0037] The connecting member 6 in this embodiment includes two plate-like members 60 and two frame members 61 that are L-shaped in a plan view, and both ends of the two frame members 61 are fixed to the plate-like members 60 by welding.

[0038] Each of the two plate-like members 60 of the connecting member 6 is fixed by a bolt and a nut to the flat outer surface (the surface opposite to the curved surface) of the hollow elastic member 4 in each of the first fixing part 2 and the second fixing part 3. In this way, the hollow elastic member 4 of the first fixing part 2 and the hollow elastic member 4 of the second fixing part 3 are connected via the connecting member 6.

[0039] The square tube 50 and angle member 51 in the above-mentioned support member 5, as well as the plate-like member 60 and frame member 61 in the connecting member 6, are desirably made of a relatively lightweight material such as aluminum, but are not limited to this.

[0040] (How to use the damping device) Next, a method of using the damping device 1 according to this embodiment will be described. Here, an example will be described in which a liquid storage tank T configured as a general box-shaped body having a rectangular cross-sectional shape is used, and the damping device 1 according to this embodiment is applied to the liquid storage tank T.

[0041] As shown in Figure 1, the liquid storage tank T is constructed by combining multiple vertical frames and multiple horizontal frames into a cage-like structure resembling a jungle gym, with a panel P (inner wall) made of, for example, fiber-reinforced plastic (FRP) attached to the side of the structure.

[0042] In this embodiment, the first side surface S1 and the second side surface S2 of the inner wall of the liquid storage tank T refer to side surfaces that are substantially perpendicular to each other in a plan view.

[0043] As shown in Figures 1 and 2, at the four corners C of the liquid storage tank T in a plan view, the first fixing portion 2 and the second fixing portion 3 of the damping device 1 are positioned at approximately the same height relative to the panel P that constitutes the corners C, with the axis of the hollow elastic member 4 being approximately horizontal.

[0044] At this time, as shown in Figs. 2 and 3, it is desirable to dispose the first fixing portion 2 and the second fixing portion 3 of the damping device 1 at a joint portion J between panels P arranged in the vertical direction.

[0045] Then, by driving screws or the like into the through holes of the angle members 51 of the first fixing portion 2 and the second fixing portion 3, the damping device 1 is fixed to the panel P that constitutes the corner portion C of the liquid storage tank T.

[0046] The damping devices 1 are preferably provided at the four corners C of the liquid storage tank T in a plan view, but are not necessarily limited to this configuration.

[0047] In addition, it is desirable to install the damping device 1 at a height where the amplitude of the panel P due to the bulging phenomenon is expected to be large. For example, it is good to install it below the center in the vertical direction of the liquid storage tank T, and it may be installed not only in one stage but also in multiple stages in the vertical direction as shown in FIG.

[0048] According to the above configuration, when an earthquake occurs, the hollow elastic member 4 of the damping device 1 deforms, thereby damping vibrations caused by earthquake motions or the like in the liquid storage tank T and weakening the bulging phenomenon. As a result, deformation and damage to the panels, frames, and the like in the liquid storage tank T can be prevented.

[0049] Other embodiments 1. The method of installing the damping device 1 on the panel of the liquid storage tank T is not limited to the above-mentioned embodiment, and may be configured such that the first fixing part 2 and the second fixing part 3 of the damping device 1 have only one angle member 51 and are fixed to the panel only via the angle member 51, as shown in Fig. 4 (only the first fixing part 2 is shown in Fig. 4 for convenience). Also, as shown in Fig. 5, the damping device 1 may be installed with a flat plate 52 interposed between each of the first fixing part 2 and the second fixing part 3 of the damping device 1 and the panel (only the first fixing part 2 is shown in Fig. 5 for convenience). It is preferable that the flat plate 52 is fixed so as to span the joint part J between the panels.

[0050] 2. The installation method of the damping device 1 according to the present invention is not limited to the corner C of the inner wall of the liquid storage tank T. Alternatively, for example, as shown in FIG. 6, the first fixing part 2 of the damping device 1 may be fixed to a panel P of the side wall of the liquid storage tank T, and the second fixing part 3 may be fixed to a panel P of the bottom of the liquid storage tank T. In this case, the panel P of the side wall becomes the first side surface S1, and the panel P of the bottom becomes the second side surface S2. Also, for example, as shown in FIG. 7, the first fixing part 2 of the damping device 1 may be fixed to a panel P of the side wall of the liquid storage tank T, and the second fixing part 3 may be fixed to a side surface of a reinforcing member R provided in the liquid storage tank T. In this case, the panel P of the side wall becomes the first side surface S1, and the side surface of the reinforcing member R becomes the second side surface S2.

[0051] 3. Although not shown in the figures, the configuration of the connecting members described above is not limited to the above-described embodiment, and other components, for example, a member having an isosceles trapezoidal shape in a planar view may be used as the frame member.

[0052] 4. The damping device according to the present invention may be used in combination with a known sloshing damper (vibration control device) for suppressing the sloshing phenomenon in a liquid storage tank. EXAMPLES

[0053] [About the demonstration experiment] A demonstration experiment was carried out to confirm the effectiveness of the damping device of the present invention. To verify the effectiveness of the damping device, a vibration experiment was conducted using a 3000mm x 3000mm x 3000mm FRP water tank.

[0054] Water was poured into this tank up to a water level of 2700mm, which is 90% of the tank's capacity, which is the same as the normal water level. The bulging damping device used here consisted of elastic deformation dampers made mainly of rubber attached to eight locations, including the four corners of the tank and at positions 1000mm and 2000mm from the tank bottom. Using seismic waves, a comparison was made of the effectiveness of the damping device in reducing the response acceleration of the tank's sidewall.

[0055] Two types of seismic waves were used in this experiment: 30% displacement of the JMA Kobe SN observation wave observed at the Kobe Marine Meteorological Observatory during the Southern Hyogo Prefecture Earthquake, and 50% displacement of the Uto NS observation wave during the Kumamoto Earthquake. The excitation direction was perpendicular to the measurement surface. A large vibration device owned by the Aichi Institute of Technology was used for the excitation experiment. In this experiment, the expansion direction of the water tank was considered positive (+) and the contraction direction was considered negative (-).

[0056] Experimental Results (Wall response displacement) Figures 8 and 9 show the wall response displacement at the 1500mm position. Figure 8 shows the wall response displacement when vibration was applied at Kobe SN 30%. Without vibration control, the maximum displacement was 82.64 mm on the + side, whereas with the addition of a damping device it was 53.12 mm, a reduction of approximately 36%. On the - side, without vibration control it was -75.76 mm, whereas with the addition of a damping device it was -60.72 mm, a reduction of approximately 20%.

[0057] Also, Fig. 9 shows the wall displacement when vibration was applied at Kumamoto Uto NS 50%. The maximum displacement without vibration control was 59.44 mm, whereas with the addition of the damping device it was 30.88 mm, a reduction of approximately 48%. On the negative side, without vibration control it was -69.36 mm, whereas with the addition of the damping device it was -43.20 mm, a reduction of approximately 38%.

[0058] (Wall response acceleration) Figures 10 and 11 show the wall response acceleration at the 2000mm position. Figure 10 shows the wall response acceleration when shaking is applied at Kobe SN 30%, and the maximum acceleration without vibration control is 7.56 m / s 2 and -7.60m / s on the negative side. 2 When a damping device is added, the positive side is 7.14 m / s 2 On the negative side, it is -6.67m / s 2 There is no significant change in the maximum acceleration. However, by adding a damping device, the repeated acceleration can be suppressed compared to when no vibration control is used, and damping is promoted after 5 seconds.

[0059] Figure 11 shows the wall response acceleration when subjected to vibration at 50% NS in the Uto area of ​​the Kumamoto earthquake. The maximum acceleration on the positive side was 6.46 m / s 2 When a damping device is added, the speed is 4.45m / s 2 The result was 1.92m / s when comparing with and without the damping device. 2 On the negative side, the vibration is reduced by about 29%. 2 When a damping device is added, it is -6.91m / s 2 and 0.35 m / s 2 However, it can be seen that the addition of the damping device, compared to when no vibration control is used, makes it possible to suppress the repeated acceleration, and damping is promoted after 5 seconds.

[0060] (Rainflow analysis) A rainflow analysis was carried out to clarify the effect of damping on wall response displacement and wall response acceleration by adding a damping device. Rainflow analysis is usually used as a method to predict fatigue life in machines and structures that are subjected to irregular repeated fluctuating loads, and it determines the amplitude that contributes to fatigue life and its occurrence frequency from the path of raindrops. In this experiment, this method was applied to wall displacement and acceleration, and the reduction effect of adding a damping device was analyzed.

[0061] Figures 12 and 13 show the results of rainflow analysis of wall displacement, with Figure 12 being for Kobe SN 30% excitation and Figure 13 being for Kumamoto Uto NS 50% excitation. In Figure 12, without vibration control, the number of occurrences of total amplitudes of 100mm to 130mm was 4.5 times, but with the addition of a damping device, this was significantly reduced to 0.5 times. Similarly, in Figure 13, without vibration control, the number of occurrences of total amplitudes of 80mm to 120mm was 5.5 times, but with the addition of a damping device, this was significantly reduced to 0 times. From this, it can be considered that the damping device was effective for large amplitudes.

[0062] On the other hand, Fig. 14 and Fig. 15 show the rainflow analysis results of the wall response acceleration. Fig. 14 shows the results when Kobe SN was excited at 30%, and Fig. 15 shows the results when Kumamoto Uto NS was excited at 50%. In Fig. 14, the wall response acceleration was 11 to 16 m / s without vibration suppression. 2 In Figure 15, the number of occurrences of the 6.0 to 13.0 m / s 2 The number of occurrences was 6.5 times without vibration control, while it was 4.5 times with the damping device. From these analysis results, it was considered that adding the damping device had the effect of suppressing the repeated large responses of the tank wall and promoting damping.

[0063] By installing the damping device of the present invention in a water tank, it was possible to reduce the wall response.Furthermore, by conducting a rainflow analysis, it was possible to clarify the damping effect by using the damping device to reduce the number of repeated occurrences of large displacements and large accelerations. [Industrial Applicability]

[0064] The damping device of the present invention can be used for a wide range of sizes of liquid storage tanks, from small tanks such as water tanks for storing clean water, to large tanks such as tanks for storing contaminated water. [Explanation of symbols]

[0065] 1. Damping device 2 1st fixed part 3 Second fixed part 4. Hollow elastic member 5 Supporting member 50 square tube 51 Angle member 52 flat plate 6 Connecting members 60 Plate-shaped member 61 Frame members T Liquid storage tank P Panel (interior wall) S1 1st side S2 2nd side J joint part C Corner L Storage Liquid R Reinforcement member

Claims

1. 1. A damping device disposed in a liquid storage tank having a rectangular cross-sectional shape, a first fixing part fixed to a first side surface of an inner wall of the liquid storage tank, a second fixing part fixed to a second side surface inside the liquid storage tank, and a connecting member connecting the first fixing part and the second fixing part, the first side and the second side are adjacent to each other; The first fixing portion and the second fixing portion each include a hollow elastic member and a support member that supports the hollow elastic member, A damping device characterized in that the connecting member connects the hollow elastic member of the first fixed part and the hollow elastic member of the second fixed part, thereby transmitting kinetic energy between the hollow elastic member of the first fixed part and the hollow elastic member of the second fixed part.

2. A damping device as described in claim 1, characterized in that the connecting member comprises a frame member spanning the hollow elastic member of the first fixed part and the hollow elastic member of the second fixed part.

3. 3. The damping device according to claim 1, wherein the first side surface and the second side surface form four corners of an inner wall of the liquid storage tank.

4. A damping device disposed in a liquid storage tank having a rectangular cross-sectional shape, a first fixing part fixed to a first side surface of an inner wall of the liquid storage tank, a second fixing part fixed to a second side surface inside the liquid storage tank, and a connecting member connecting the first fixing part and the second fixing part, the first side and the second side are adjacent to each other; The first fixing portion and the second fixing portion each include a hollow elastic member and a support member that supports the hollow elastic member, the connecting member connects the hollow elastic member of the first fixing portion and the hollow elastic member of the second fixing portion, A damping device characterized in that a plurality of stages are arranged vertically within the liquid storage tank.

5. The damping device according to any one of claims 1 to 4, characterized in that the liquid storage tank is a panel-type tank formed by joining a plurality of panels, the first fixing portion is fixed to a joint portion between the panels on the first side surface, and the second fixing portion is fixed to a joint portion between the panels on the second side surface.

6. 6. The damping device according to claim 1, wherein the hollow elastic member is made of a thermosetting elastomer or a thermoplastic elastomer.

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