Sloshing suppression structure

Abstract

To provide a sloshing suppression structure with a wider range of applications compared to suppressing sloshing by floating a floating body or a floating roof on the liquid surface. [Solution] The sloshing suppression structure 100 comprises a pool body 52 installed in a high-rise building 10, which stores water W and has a water surface WA, a movable floor 110 that is movable up and down on the bottom 56 of the pool body 52 and allows water W to pass through, and a movable floor lifting device 130 that moves the movable floor 110 in the water W to a position where sloshing is suppressed when an earthquake is detected.

Description

[Technical Field]

[0001] The present invention relates to a sloshing suppression structure. [Background technology]

[0002] Patent Document 1 discloses a technology relating to a sloshing suppression device that is installed in a storage container that contains liquid, such as various liquid storage tanks or liquid storage tanks, including oil tanks, waterworks tanks, agricultural water tanks, and industrial water tanks, to suppress sloshing caused by the liquid. In this prior art, the sloshing suppression device comprises a flat float that floats on the surface of the liquid in the storage container, and a tuned vibration system that has a spring that is stretched elastically and expandably in a direction approximately parallel to the surface or bottom of the float, and a weight attached to at least one end of the spring.

[0003] Patent Document 2 discloses a technology relating to an apparatus and method for suppressing sloshing of volatile petroleum products stored in a floating roof tank. In this prior art, at least one sloshing suppression device is placed inside the tank body in advance, and the device includes a resistance plate that moves freely due to the flow of the stored liquid, a support that is submerged in the stored liquid and movably installed on the bottom of the tank body and supports the resistance plate in the stored liquid as it tends to float due to buoyancy, and a wire that connects the resistance plate to the support. Sloshing is damped by the fluid resistance generated by the relative movement between the sloshing suppression device and the flowing stored liquid. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-143575 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-280738 Summary of the Invention [Problem to be solved by the invention]

[0005] Storage containers with flat floats floating on the surface of the liquid, as in Patent Document 1, and floating roof tanks with a floating roof floating on the surface of the liquid stored in the tank body, as in Patent Document 2, have a narrow range of application, as they cannot be used in, for example, swimming pools or bathtubs.

[0006] In view of the above, an object of the present invention is to provide a sloshing suppression structure that has a wider range of application than when sloshing is suppressed by floating a floating body or a floating roof on the liquid surface. [Means for solving the problem]

[0007] The first aspect is a sloshing suppression structure that is installed in a building, has a storage section that stores liquid and has a liquid surface, a movable floor that is movable up and down above the bottom of the storage section and allows the liquid to pass through, and a movable floor lifting section that, when it detects the occurrence of an earthquake, moves the movable floor in the liquid to a position where sloshing of the liquid is suppressed.

[0008] In the sloshing suppression structure of the first aspect, when an earthquake is detected, the movable floor moves to a position where sloshing is suppressed, thereby suppressing sloshing. Therefore, compared to suppressing sloshing by floating a floating body or a floating roof on the liquid surface, the range of application is wider.

[0009] A second aspect is the sloshing suppression structure according to the first aspect, in which the movable floor lifting unit moves the movable floor to a position where the sloshing natural frequency does not match the natural frequency of the building.

[0010] In the sloshing suppression structure of the second aspect, when an earthquake is detected, the movable floor moves, changing the apparent water depth, and the natural frequency of sloshing no longer matches the natural frequency of the building, thereby suppressing resonance between sloshing and the building, thereby suppressing sloshing.

[0011] The third aspect is a sloshing suppression structure that includes a storage section that stores liquid and has a liquid surface, a movable floor that is movable up and down above the bottom of the storage section and allows the liquid to pass through, and a movable floor lifting section that repeatedly moves the movable floor up and down in the liquid when it detects the occurrence of an earthquake.

[0012] In the sloshing suppression structure of the third aspect, when an earthquake is detected, the movable floor repeatedly moves up and down, causing the apparent water depth to continue to change and the natural frequency of sloshing to continue to change, thereby suppressing resonance and thereby suppressing sloshing. [Effects of the Invention]

[0013] According to the present invention, a sloshing suppression structure with a wider range of applications is provided compared to a case where sloshing is suppressed by floating a floating body or a floating roof on the liquid surface. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram of a high-rise building equipped with a pool. [Figure 2] 1 is a perspective view showing the structure of a pool to which the sloshing suppression structure of the first embodiment is applied. FIG. [Figure 3] 1 is a plan view of a pool to which a sloshing suppression structure according to a first embodiment is applied. FIG. [Figure 4] (A) is an explanatory diagram of the state in which the movable floor is at the bottom, and (B) is an explanatory diagram of the state in which the movable floor has moved upward when an earthquake is detected. [Figure 5] 1 is a graph showing the first natural frequency and sloshing frequency of a high-rise building. [Figure 6] FIG. 1 is a model diagram of a numerical simulation. [Figure 7] (A) is a graph showing the change in sloshing water level over time when the moving speed of the movable floor during an earthquake is 0.100 m / s, and (B) is a graph showing the change in overflow volume over time. [Figure 8](A) is a graph showing the change in sloshing water level over time when the moving speed of the movable floor during an earthquake is 0.050 m / s, and (B) is a graph showing the change in overflow volume over time. [Figure 9] (A) is a graph showing the change in sloshing water level over time when the moving speed of the movable floor during an earthquake is 0.025 m / s, and (B) is a graph showing the change in overflow volume over time. [Figure 10] FIG. 2 is a cross-sectional view showing a schematic configuration of the lifting device. [Figure 11] FIG. 2 is a block diagram of a movable floor lifting device. [Figure 12] FIG. 2 is a block diagram showing a hardware configuration of a control device. [Figure 13] FIG. 2 is a block diagram showing the functional configuration of a control device. [Figure 14] 10 is a flowchart showing the flow of processing when an earthquake is detected in the movable floor lifting device of the first embodiment. [Figure 15] Showing the movement of the movable floor when an earthquake is detected in the pool of the second embodiment, (A) is an explanatory diagram of the state in which the movable floor has moved to the upper first position, and (B) is an explanatory diagram of the state in which the movable floor has moved to the lower second position. [Figure 16] 10 is a flowchart showing the flow of processing when an earthquake is detected in the movable floor lifting device of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] First Embodiment A sloshing suppression structure according to a first embodiment of the present invention will be described.

[0016] The two directions perpendicular to the horizontal direction are the X direction and the Y direction, respectively indicated by the arrows X and Y. The vertical direction perpendicular to the X direction and the Y direction is the Z direction, indicated by the arrow Z.

[0017] Furthermore, each drawing is merely a schematic representation. The dimensions and proportions of each element shown in the drawings may not necessarily correspond to the actual elements. The dimensions, proportions, and number of each element may not necessarily correspond between multiple drawings. Hatching representing cross sections may be omitted if it makes the view difficult to see.

[0018] In addition, descriptions of configurations that are not directly related to the present invention and well-known configurations may be omitted or simplified.

[0019] These also apply to the second embodiment described later.

[0020] [structure] First, the structure of the sloshing suppression structure of this embodiment will be described.

[0021] The sloshing suppression structure 100 of this embodiment is applied to a pool 102 shown in Fig. 1 (see also Fig. 2). In this embodiment, the pool 102 is installed on the top floor 12 of a multi-story high-rise building 10.

[0022] As shown in Fig. 2, the sloshing suppression structure 100 applied to a pool 102 is configured to include a pool body 52, a movable floor 110, and a movable floor lifting / lowering device 130 (see also Fig. 11). Note that a control device 140 constituting the movable floor lifting / lowering device 130, which will be described later, is shown next to the pool body 52 for convenience in Fig. 2, but may be installed anywhere.

[0023] Pool body 52, which is an example of a storage section, is composed of bottom 56 that is rectangular in plan view and sidewalls 54 that rise from the outer periphery of bottom 56 (see also FIG. 3). Water W, which is an example of a liquid, is stored within pool body 52 (see also FIG. 3).

[0024] As shown in Figures 2 and 11, the movable floor lifting device 130 is configured to include a plurality of lifting devices 150 (see also Figure 10) that raise and lower the frame material 120 (see Figure 2) described later, and a control device 140.

[0025] The lifting device 150 may have any structure as long as it has the function of lifting and lowering the frame material 120 and the movable floor 110, but in this embodiment it has the following structure.

[0026] As shown in FIG. 2, the lifting devices 150 are provided on the side wall 54 of the pool main body 52 at intervals in the X direction.

[0027] 10, the lifting device 150 has a lifting shaft 152 that protrudes from a device body 154. The hole in the device body 154 through which the lifting shaft 152 protrudes is sealed to prevent water W from entering the device body 154.

[0028] A frame material 120 (see also FIG. 2) is supported on the lifting shaft 152 of each lifting device 150. In addition, a movable floor 110 is placed on the frame material 120. Therefore, when the lifting shaft 152 of each lifting device 150 moves up and down (extends and contracts), the supported frame material 120 moves up and down, and the movable floor 110 placed on the frame material 120 moves up and down in the water W.

[0029] As shown in Fig. 2, the frame material 120 of this embodiment is made up of square pipes joined in a lattice pattern, but is not limited to this. The movable floor 110 is designed to allow water W stored in the pool body 52 to pass through. The movable floor 110 of this embodiment is made up of a slatted floor material with slits 112 formed therein through which the water W passes, but is not limited to this.

[0030] As shown in Fig. 11, each lifting device 150 is electrically connected to a control device 140. The control device 140 has a function to control the elevation of the lifting shaft 152 (see Fig. 10) of each lifting device 150, and a function to detect the occurrence of an earthquake. The amount of elevation of the lifting shaft 152 (see Fig. 10) of each lifting device 150 is controlled by the control device 140 so that they are all the same.

[0031] Next, a description will be given of the hardware configuration of the control device 140 of this embodiment. The control device 140 has the same configuration as a general computer.

[0032] 12, the control device 140 includes a CPU (Central Processing Unit) 141A, a ROM (Read Only Memory) 141B, a RAM (Random Access Memory) 141C, a storage 141D, a first communication interface 141E, a second communication interface 141F, an input unit 141G, and a display unit 141H. Each component is connected to each other via a bus 141J so as to be able to communicate with each other.

[0033] The CPU 141A is a central processing unit that executes various programs and controls the operation of each lifting device 150 (see FIG. 10), etc. That is, the CPU 141A reads various programs from the ROM 141C or the storage 141D and executes the programs using the RAM 141C as a work area. The CPU 141A controls the above-mentioned components and performs various arithmetic processing in accordance with the programs recorded in the ROM 141C or the storage 141D. In this embodiment, the ROM 141C or the storage 141D stores various programs.

[0034] The ROM 141C stores various programs and various data. The RAM 141B temporarily stores programs or data as a working area. The storage 141D is configured with an HDD (Hard Disk Drive), an SSD (Solid State Drive), flash memory, etc., and stores various programs including the operating system and various data.

[0035] The first communication interface 141E is an interface for wired or wireless communication with other devices such as the elevator device 150 (see FIG. 10), and uses standards such as Ethernet (registered trademark), FDDI, and Wi-Fi (registered trademark). The second communication interface 141F is an interface for connecting to the Internet 190 (see FIG. 11).

[0036] The input unit 141G includes a pointing device such as a mouse, a keyboard, etc., and is used to perform various inputs. The display unit 141H is, for example, a display, and displays various types of information. A touch panel system may be adopted for the display unit 141H so that it functions as the input unit 141G.

[0037] Next, the functional configuration of the control device 140 will be described.

[0038] As shown in FIG. 13, the control device 140 includes an elevator device control section 142 and an earthquake detection section 143.

[0039] The lifting device control unit 142 controls the lifting and lowering of the lifting shafts 152 (see FIG. 10) of the lifting devices 150. As described above, the lifting device control unit 142 lifts and lowers the lifting shafts 152 (see FIG. 10) of the lifting devices 150 so that the lifting amounts are the same.

[0040] The earthquake detection unit 143 detects the occurrence of an earthquake. In this embodiment, the earthquake detection unit 143 detects the occurrence of an earthquake by receiving an emergency earthquake warning issued by the Japan Meteorological Agency 192 (see FIG. 11) via the Internet 190 (see FIG. 11).

[0041] In this embodiment, when the earthquake detection unit 143 detects the occurrence of an earthquake, the control device 140 moves the movable floor 110 to a preset position where sloshing is suppressed by the lifting device control unit 142. The preset position where the movable floor 110 is moved to, where sloshing is suppressed, will be described later.

[0042] Next, the process of the control device 140 for moving the movable floor 110 when an earthquake occurs will be described with reference to the flowchart of FIG.

[0043] In step S101, CPU 141A (see FIG. 12) checks whether an Earthquake Early Warning has been received. If not (No), the process returns to step S101; that is, CPU 141A waits until an Earthquake Early Warning is received. If received (Yes), the process proceeds to step S102.

[0044] In step S102, the CPU 141A raises the lift shaft 152 (see FIG. 10) to move the movable floor 110 (see FIGS. 2 and 10) to a preset position where sloshing is suppressed.

[0045] The lifting device 150 is also designed so that the movable floor 110 can be moved to any position by a person operating an operation panel (not shown).

[0046] [Effect] Next, the operation of this embodiment will be described.

[0047] An earthquake shakes the high-rise building 10, causing sloshing (fluctuation of the liquid surface) in the water W in the pool 102, resulting in a wave-like flow in which the water surface WA near one side wall 54 descends and the water surface WA near the other side wall 54 rises alternately. This sloshing causes the water W near the side wall 54 to overflow onto the poolside 60.

[0048] The frequency of the displacement of the water surface WA due to this sloshing is called the sloshing natural frequency. The sloshing natural frequency is determined by the shape of the pool, not the magnitude of the response, and can be calculated from the pool length and water depth, as described below. The water level of the water surface WA displaced by sloshing is called the sloshing water level. The reference water level is the water surface WA when no earthquake has occurred.

[0049] As shown in FIG. 4(A), the movable floor 110 is normally located near and above the bottom 56 of the pool body 52.

[0050] However, as shown in Figure 4(B), when an earthquake is detected, the movable floor 110 moves to a position where sloshing is suppressed. In this embodiment, the position where the movable floor 110 moves to suppress sloshing is a position where the sloshing natural frequency of the water W stored in the pool body 52 does not match the natural frequency of the high-rise building 10. Therefore, resonance between the sloshing of the pool 102 and the high-rise building 10 is suppressed, suppressing sloshing and, as a result, reducing the amount of water overflowing onto the poolside 60.

[0051] In this way, the sloshing suppression structure 100 of this embodiment suppresses sloshing without floating a floating body or a floating roof on the water surface WA, and therefore can be applied to swimming pools where people swim.

[0052] After the earthquake shaking has subsided, the movable floor 110 is returned to the position shown in Fig. 4(A). Any method may be used to return the movable floor 110 to the position shown in Fig. 4(A). For example, as in the second embodiment described below, the movable floor 110 may be automatically returned after a predetermined time has elapsed since the occurrence of an earthquake was detected, or the movable floor 110 may be returned by a person operating an operation panel.

[0053] Here, the sloshing natural frequency can be calculated using the following [Equation 1], where n is the order of the frequency mode, π is the constant of the circumference of a circle, tanh function is the tangent hyperbolic function, g is the acceleration of gravity, fn is the frequency of the nth mode, L is the length of the pool, and H is the water depth.

[0054]

number

[0055] As can be seen from this [Equation 1], the natural frequency of sloshing can be calculated using the pool length L and the water depth H. When the movable floor 110 rises, the water depth H between the movable floor 110 and the water surface WA changes, and so the natural frequency of sloshing changes. For convenience, the water depth between the movable floor 110 and the water surface WA may be referred to as the "apparent water depth."

[0056] Next, the position where the sloshing of the movable floor 110 shown in FIG. 4(B) is suppressed, that is, the position where the natural frequency of sloshing does not match the natural frequency of the high-rise building 10 in this embodiment, will be described.

[0057] The graph in Figure 5 shows the response magnification of sloshing displacement relative to the input acceleration caused by an earthquake when the height of the high-rise building 10 is 120 m. The pool length in the Y direction is 10 m, and the response magnification was calculated as the value at the end of the pool in the Y direction. The natural frequency of the 120 m high high-rise building 10 is determined by numerical simulation or the like.

[0058] In this example, when the apparent water depth is 1.0 m, the first frequency of the natural frequency of the high-rise building 10 and the second frequency of the sloshing natural frequency are approximately the same. In contrast, when the apparent water depth is 0.8 m and 0.6 m, the first frequency of the natural frequency of the high-rise building 10 and the second frequency of the sloshing natural frequency are different. Therefore, in this embodiment, when an earthquake is detected, the movable floor 110 may be moved to a position where the apparent water depth is less than 1.0 m, for example, to a position where the apparent water depth is 0.5 m.

[0059] When the apparent water depth during normal use is 0.8 m, the primary frequency of the natural frequency of the high-rise building 10 does not match the secondary frequency of the sloshing natural frequency. However, even in this case, by setting the apparent water depth to 0.5 m, the sloshing natural frequency deviates from the primary frequency of the natural frequency of the high-rise building 10, further reducing the possibility of resonance compared to when the apparent water depth is 0.8 m, thereby reducing changes in the sloshing water level and the amount of overflow.

[0060] Furthermore, the pool body 52, which is rectangular in plan view, has a pool length Lx in the X direction and a pool length Ly in the Y direction. Therefore, from the above-mentioned [Equation 1], the sloshing natural frequency differs between the X direction and the Y direction. Therefore, the movable floor 110 is moved to a position where both the sloshing natural frequency in the X direction and the sloshing natural frequency in the Y direction do not match the natural frequency of the high-rise building 10, or to a position farther away from the position where they match.

[0061] (Numerical simulation) Next, a numerical simulation will be described on the effect of suppressing the amount of water overflowing onto the poolside 60 due to sloshing in the pool 102 to which the sloshing suppression structure 100 of this embodiment is applied.

[0062] First, the analysis conditions for the pool of numerical simulations will be explained.

[0063] The mathematical model of pool 700 shown in Fig. 6 has a depth of 1 m, a pool length L of 10 m, a water depth H of 1 m, and a width R of pool side 760 of 3 m. Note that since no mesh was cut in the depth direction during the analysis, the mathematical model is three-dimensional and the analytical degree of freedom is two-dimensional.

[0064] Furthermore, the mathematical model assumed that pool 700 was installed on the 29th floor of a 30-story high-rise building with a height of 120 m. The high-rise building had a period of 2.4 s and the main frame was elastic. Furthermore, taking into account the damping effect of dampers and other damping devices installed in the high-rise building during an earthquake, the damping constant of the main frame was set to h = 0.03, and the input acceleration to the high-rise building was set to El Centro NS waves. Furthermore, the acceleration waveform of the 29th floor where pool 700 was installed during an earthquake, obtained through numerical analysis under these analysis conditions, was input to the bottom 704 of the pool body 702.

[0065] The moving speed of the movable floor 710 was set to three speeds: 0.1 m / s, 0.05 m / s, and 0.025 m / s. The analysis started at the moment the earthquake occurred, and the movable floor 710 was moved from a water depth of 1.0 m to a water depth of 0.5 m at each speed at the same time as the analysis started.

[0066] Under these conditions, a numerical simulation was performed to determine the sloshing water level at the left end of pool body 702 and the amount of water overflowing onto left pool side 760 during an earthquake.

[0067] Figure 7(A) is a graph showing the change in overflow volume when the apparent water depth is 1.0 m, when the apparent water depth changes from 1.0 m to 0.5 m at a moving speed of 0.1 m / s, and when the apparent water depth is 0.5 m, and Figure 7(B) is a graph showing the change in sloshing water level.

[0068] Figure 8(A) is a graph showing the change in overflow volume when the apparent water depth is 1.0 m, when the apparent water depth changes from 1.0 m to 0.5 m at a moving speed of 0.05 m / s, and when the apparent water depth is 0.5 m, and Figure 8(B) is a graph showing the change in sloshing water level.

[0069] Figure 9(A) is a graph showing the change in overflow volume when the apparent water depth is 1.0 m, when the apparent water depth changes from 1.0 m to 0.5 m at a moving speed of 0.025 m / s, and when the apparent water depth is 0.5 m, and Figure 9(B) is a graph showing the change in sloshing water level.

[0070] When the apparent water depth in these graphs is 1.0 m, the natural frequency of sloshing matches the natural frequency of a high-rise building, so the amount of overflow and the displacement of the sloshing water level are large.

[0071] In contrast, when the apparent water depth in these graphs is 0.5 m, the natural frequency of sloshing and the natural frequency of the high-rise building do not match, but are far apart, so the amount of overflow and the displacement of the sloshing water level are suppressed.

[0072] Furthermore, from the graphs of Figures 7(A) and 7(B), when the moving speed of the movable floor 710 is fast at 0.1 m / s, the movable floor 710 has completed moving to a water depth of 0.5 m approximately 8 seconds after the overflow amount and sloshing water level reach their maximum values, so the effect of suppressing the displacement of the overflow amount and sloshing water level is significant.

[0073] However, from the graphs of Figures 8(A), 8(B), 9(A), and 9(B), when the moving speed of the movable floor 710 is slow, at 0.05 m / s and 0.025 m / s, the effect of suppressing the overflow amount and sloshing water level is small because the movable floor 710 is still moving about 8 seconds later, when the overflow amount and sloshing water level reach their maximum values. However, after the movable floor 710 moves to a water depth of 0.5 m, the overflow amount and sloshing water level are suppressed.

[0074] In this way, it can be seen that sloshing can be suppressed by separating the natural frequency of sloshing from the natural frequency of a high-rise building. It can also be seen that the effect of suppressing sloshing can be increased by moving the movable floor to a predetermined position early after an earthquake occurs.

[0075] Here, it has been found that there are other factors that affect the magnitude of sloshing besides the resonance between the natural frequency of sloshing of the pool 102 and the natural frequency of the high-rise building 10. In other words, even if the natural frequency of sloshing of the pool 102 and the natural frequency of the high-rise building 10 do not match, sloshing may become large.

[0076] However, the factors that affect the magnitude of sloshing are complex and not all of them have been clarified.

[0077] Therefore, in this embodiment, a position of the movable floor 110 where sloshing is suppressed more than the position of the movable floor 110 in Figure 4(A) during normal use, or a position of the movable floor 110 where sloshing is minimized, may be determined by computer simulation or model experiments that reflect various conditions (for example, the detailed shape of the pool body 52, etc.), and the movable floor 110 may be moved to that position when an earthquake is detected.

[0078] In short, when an earthquake is detected, the movable floor 110 should be moved to a position where sloshing is suppressed more than the position shown in FIG. 4(A) during normal use.

[0079] Second Embodiment Next, a sloshing suppression structure according to a second embodiment of the present invention will be described. Note that the same members as those in the first embodiment are designated by the same reference numerals, and descriptions of overlapping contents will be omitted or simplified.

[0080] [structure] The structure of the sloshing suppression structure of this embodiment will be described.

[0081] A swimming pool 202 to which the sloshing suppression structure 200 of this embodiment shown in FIG. 15 is applied is installed on the ground.

[0082] Furthermore, the sloshing suppression structure 200 applied to the pool 202 is configured to include a pool body 52, a movable floor 110 (see also Figures 2 and 3), and a movable floor lifting device 130 (see Figures 2, 11, and 12), similar to the first embodiment. In other words, the sloshing suppression structure 200 of this embodiment is structurally similar to the sloshing suppression structure 100 of the first embodiment.

[0083] The sloshing suppression structure 200 of this embodiment differs from the sloshing suppression structure 100 of the first embodiment in the way in which the movement of the movable floor 110 is controlled after an earthquake is detected.

[0084] In this embodiment, as in the first embodiment, the movable floor 110 is normally positioned near and above the bottom 56 of the pool body 52, as shown in Figure 4(A). This position of the movable floor 110 is defined as the initial position.

[0085] In the control device 140 shown in Figure 13 (see also Figures 11 and 12), when the earthquake detection unit 144 detects the occurrence of an earthquake, the lifting device control unit 142 moves the movable floor 110 up and down by alternately moving the movable floor 110 between a first position shown in Figure 15(A) and a second position shown in Figure 15(B) that have been set in advance.

[0086] Next, the process of the control device 140 for moving the movable floor 110 when an earthquake occurs will be described with reference to the flowchart of FIG.

[0087] In step S201, CPU 141A (see FIG. 12) checks whether an Earthquake Early Warning has been received. If not (No), the process returns to step S201; that is, CPU 141A waits until an Earthquake Early Warning is received. If received (Yes), the process proceeds to step S202.

[0088] In step S202, the CPU 141A repeatedly raises and lowers the lifting shaft 152 (see FIG. 10), and alternately moves the movable floor 110 between the first position (FIG. 15(A)) and the second position (FIG. 15(B)), thereby moving the movable floor 110 up and down.

[0089] In step S203, the CPU 141A checks whether a preset time, for example, five minutes, has elapsed since the detection of the earthquake.

[0090] If the time has not elapsed (No), the process returns to step S203. That is, CPU 141A waits until the emergency set time has elapsed. If the time has elapsed (Yes), the process proceeds to step S204.

[0091] In step S204, the CPU 141A stops the up and down movement of the movable floor 110, and moves it to its original initial position on the bottom 56 of the movable floor 110 (FIG. 4(A)).

[0092] [Effect] Next, the operation of this embodiment will be described.

[0093] An earthquake shakes the high-rise building 10, causing sloshing (fluctuation of the liquid surface) in the water W in the pool 102, resulting in a wave-like flow in which the water surface WA near one side wall 54 descends and the water surface WA near the other side wall 54 rises alternately. This sloshing causes the water W near the side wall 54 to overflow onto the poolside 60.

[0094] As shown in FIG. 4(A), the movable floor 110 is normally located near and above the bottom 56 of the pool body 52.

[0095] However, as shown in FIG. 15, when an earthquake is detected, the movable floor 110 alternately moves between a first position (FIG. 15(A)) and a second position (FIG. 15(B)), and the movable floor 110 continues to move up and down.

[0096] In this way, when an earthquake is detected, the movable floor 110 continues to move up and down repeatedly, causing the apparent water depth to continue to change, i.e., the natural frequency of sloshing to continue to change, thereby suppressing resonance. Therefore, sloshing is suppressed.

[0097] Here, the pool body 52 of the swimming pool 202 of this embodiment is installed on the ground. Therefore, the seismic waves input to the pool body 52 have multiple frequency components. Therefore, even if the movable floor 110 is moved to the first position (FIG. 15(A)), there is a risk that the sloshing natural frequency of the movable floor 110 at the first position will coincide with any of the natural frequencies of the multiple frequency components, causing resonance.

[0098] However, as in this embodiment, by repeatedly moving the movable floor 110 up and down to continuously change the sloshing natural frequency, it is possible to prevent the resonance from continuing.

[0099] In this way, the sloshing suppression structure 200 of this embodiment suppresses sloshing without floating a floating body or a floating roof on the water surface WA, and therefore can be applied to swimming pools where people swim.

[0100] In this embodiment, the movable floor 110 automatically returns to the initial position shown in Fig. 4(A) after a preset time has elapsed since the detection of the occurrence of an earthquake, but this is not limited to this. The movable floor 110 may be returned to its initial position by manually operating the operation panel after the earthquake shaking has subsided.

[0101] <Other> The present invention is not limited to the above embodiment.

[0102] For example, in the first embodiment, the pool 102 is installed on the top floor 12 of the high-rise building 10, but this is not limiting. The pool 102 may be installed on a floor other than the top floor 12 or on the roof, or may be installed in a building other than the high-rise building 10.

[0103] Furthermore, for example, in the first embodiment, the movable floor 110 is configured to rise and move to a position where sloshing is suppressed when an earthquake is detected, but this is not limited to this. The movable floor 110 may be configured to descend and move to a position where sloshing is suppressed when an earthquake is detected.

[0104] Furthermore, for example, in the second embodiment, the pool 202 is installed on the ground, but this is not limiting. The pool 202 may be installed in a building. In this case, too, by continuously changing the sloshing natural frequency, continuous resonance with the natural frequency of the building is prevented, thereby suppressing sloshing.

[0105] Furthermore, for example, in the above embodiment, the occurrence of an earthquake is detected using an emergency earthquake warning issued by the Japan Meteorological Agency 192, but this is not limiting. For example, an earthquake with a seismic intensity equal to or greater than a preset seismic intensity or an earthquake with an acceleration greater than a preset seismic intensity may be detected by seismometers installed in the high-rise building 10, near the high-rise building 10, near the pool 202, etc.

[0106] Furthermore, in the above-described embodiments, the sloshing suppression structure of the present invention is applied to recreational swimming pools 102, 202 where people swim, but the present invention is not limited to this. For example, the sloshing suppression structure of the present invention may be applied to large bathtubs such as Jacuzzis, water storage tanks, and water storage tanks. For example, the sloshing suppression structure of the present invention may be applied to a spent fuel pool that stores spent fuel and the like at a nuclear facility.

[0107] The sloshing suppression structure of the present invention may also be applied to storage tanks and storage tanks that store liquids other than water.

[0108] In the above embodiments, the processing performed by the CPU 141A after reading software (programs) may be performed by various processors other than a CPU. Examples of processors in this case include dedicated electrical circuits, such as programmable logic devices (PLDs) and application-specific integrated circuits (ASICs), whose circuit configurations are reconfigurable after fabrication, such as field-programmable gate arrays (FPGAs), which are processors with circuit configurations specifically designed to perform specific processing. Furthermore, the processing may be performed by one of these various processors, or by a combination of two or more processors of the same or different types (e.g., multiple FPGAs, or a combination of a CPU and an FPGA). Furthermore, the hardware structure of these various processors is, more specifically, an electrical circuit that combines circuit elements such as semiconductor devices.

[0109] Furthermore, the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. A plurality of embodiments and modifications can be implemented in combination as appropriate. [Explanation of symbols]

[0110] 52 Pool body (example of storage section) 56 Bottom 100 Sloshing suppression structure 102 Pool 110 Movable floor 130 Movable floor lifting device 200 Sloshing suppression structure 202 Pool

Claims

1. a storage unit that is installed in the building, stores a liquid, and has a liquid level; a movable floor that is provided on the bottom of the storage section so as to be movable up and down and through which the liquid can pass; a movable floor lifting unit that, when detecting the occurrence of an earthquake, moves the movable floor in the liquid to a position where sloshing of the liquid is suppressed; A sloshing suppression structure.

2. the movable floor lifting unit moves the movable floor to a position where the sloshing natural frequency does not match the natural frequency of the building. The sloshing suppression structure according to claim 1.

3. a reservoir portion that stores a liquid and has a liquid level; a movable floor that is provided on the bottom of the storage section so as to be movable up and down and through which the liquid can pass; a movable floor lifting unit that repeatedly moves the movable floor up and down in the liquid when an earthquake is detected; A sloshing suppression structure.

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