Self-resetting semi-underground liquid storage tank with multiple damping units and damping method thereof

Abstract

The application relates to a self-resetting semi-underground liquid storage tank with multiple damping units and a damping method thereof. The liquid storage tank is externally provided with a two-section self-resetting side wall unit connected with surrounding soil through an eddy current damping-inertial unit. One screw rod stroke cavity is connected with the two-section self-resetting side wall unit through a sliding block, and the other is hinged with the surrounding soil through a hinge support. The sliding block is slidingly connected in a sliding rail. The two ends of a ball screw rod are respectively inserted into the screw rod stroke cavities connected with the sliding block and the hinge support. A rotating mass disc is arranged on the ball screw rod. A ball nut is sleeved on the ball screw rod. The ball nut is respectively embedded into the screw rod stroke cavities connected with the sliding block and the hinge support. Permanent magnets are respectively arranged on the screw rod stroke cavities connected with the sliding block and the hinge support and sleeved on the ball nut. Compared with the prior art, the application eliminates the stress concentration effect in the semi-underground liquid storage tank, simultaneously reduces the liquid and structure composite response of the liquid storage tank, and improves the seismic toughness of the semi-underground liquid storage tank.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of civil engineering structure energy dissipation and shock absorption, and relates to a self-resetting semi-underground liquid storage tank with multiple shock absorption units and a shock absorption method thereof. BACKGROUND

[0002] The demand for clean energy with low carbon and environmental protection is increasing. Natural gas is recognized as the cleanest fossil energy on earth, but it is difficult to store and transport; ultra-low temperature liquefaction of natural gas can form liquefied natural gas (LNG), and then realize convenient transportation and long-term storage. With the rapid development of thin film tank technology, the liquid storage tank as a storage medium for LNG is gradually becoming large-scale; at present, the maximum capacity of a single storage tank in China has reached 270,000 cubic meters. As an important lifeline engineering and energy infrastructure, the disaster prevention safety performance of the liquid storage tank structure under dynamic load disasters has attracted widespread attention.

[0003] Compared with the above-ground liquid storage tank structure, the underground or semi-underground liquid storage tank structure has more advantages. On the one hand, the liquid storage tank structure is mostly located in coastal areas, and the underground or semi-underground structure form is more convenient for the loading and unloading of LNG ships; and compared with the above-ground structure, it has natural advantages in resisting typhoons and tsunamis; on the other hand, once LNG leakage occurs, the influence radius of the underground or semi-underground liquid storage tank structure is smaller. Considering the high cost, long construction period and great construction difficulty of the underground liquid storage tank structure, the semi-underground liquid storage tank structure has more extensive engineering application.

[0004] The liquid storage tank structure in earthquake-prone areas may be subjected to strong earthquake action, and significant residual deformation of the liquid storage tank structure may occur under rare earthquake action, which seriously affects its use function and structural safety, and further causes serious economic loss and social impact. The energy dissipation and shock absorption technology attaches energy dissipation and shock absorption devices to the controlled structure to jointly bear the action of earthquakes and wind vibrations, etc., and uses additional energy dissipation and additional stiffness to ensure the complex requirements of the controlled structure, such as seismic safety, human comfort and normal use function. The side wall of the traditional semi-underground liquid storage tank and the surrounding soil form a fluid-tank-soil complex interaction system together. Under the action of earthquakes, stress concentration is easy to occur at the interface of the system interaction, and the sudden change of the lateral boundary condition of the tank body caused by the semi-buried soil will amplify the peak values of the shear force, bending moment, concentrated stress and liquid wave of the liquid storage tank body, and further seriously threaten the seismic safety and normal use function of the liquid storage tank structure. Therefore, it is urgent to develop a semi-underground liquid storage tank structure system that can eliminate stress concentration effect and realize efficient absorption and disposal of seismic energy.

[0005] Patent CN109267675A discloses a shear wall system with hysteresis type inertial capacity, comprising a shear wall structure, a hysteresis inertial capacity structure, and a mounting base, the hysteresis inertial capacity structure comprises a plurality of groups of hysteresis energy dissipation support units and a plurality of groups of viscous self-resetting inertial capacity units; wherein the viscous self-resetting inertial capacity unit comprises a connecting ring, a ball screw, an inertial capacity outer cylinder, a rotating inner cylinder, a rotating nut, a high-strength cable group, a plurality of rotating masses, viscous damping liquid, an inner cylinder rotating shaft and a connecting rod. But the viscous self-resetting inertial capacity unit and the hysteresis shear plate in the patent are connected in parallel in the vertical space, and the installation method is used to constrain the self-resetting deformation of the shear wall system, which cannot solve the problems of releasing the self-resetting tank deformation and relieving the stress concentration effect caused by the interaction between the semi-buried soil body and the tank; at the same time, the above installation position makes the shear wall and the mounting base have a spacing, and similar technology applied to the thin film type liquid storage tank cannot provide sufficient vertical support and self-resetting capacity for the inner tank containing liquid, thereby affecting the normal use function.

[0006] Patent CN109163047A discloses a nonlinear eddy current inertial mass damper and design method, the nonlinear eddy current inertial mass damper comprises a transmission assembly, a rotary eddy current damping element, an inertial flywheel and an outer cylinder; the transmission assembly comprises a ball screw system, a linear guide rail and a connecting rod; the rotary eddy current damping element comprises upper and lower magnetic conducting circular plates, a magnet group and a conductor circular plate; the inertial flywheel is sleeved on the ball screw and fixedly connected with the ball nut; the ball screw sequentially penetrates the center holes of the upper magnetic conducting circular plate, the ball nut, the lower magnetic conducting circular plate and the inertial flywheel. But the application range of the patent is limited to linear motion along the ball screw axis, and cannot solve the problem of non-linear motion along the ball screw axis such as rocking motion. SUMMARY

[0007] The purpose of the present application is to overcome at least one of the defects of the prior art and provide a self-resetting semi-underground liquid storage tank with multiple damping units and a damping method thereof, which can eliminate the stress concentration effect in the semi-underground liquid storage tank, reduce the liquid and structure composite response of the liquid storage tank, and improve the seismic toughness of the semi-underground liquid storage tank.

[0008] The purpose of the present application can be achieved by the following technical solutions:

[0009] One of the technical solutions of the present application is to provide a self-resetting semi-underground liquid storage tank with multiple damping units, which is semi-buried in the ground, and is connected with the surrounding soil through a two-section self-resetting side wall-electric eddy current damping-inertial capacity device, the two-section self-resetting side wall-electric eddy current damping-inertial capacity device comprises a two-section self-resetting side wall unit and an electric eddy current damping-inertial capacity unit, the liquid storage tank is externally provided with a two-section self-resetting side wall unit, the two-section self-resetting side wall unit is connected with the surrounding soil through an electric eddy current damping-inertial capacity unit,

[0010] The eddy current damping-inerter unit comprises an inerter part, an eddy current damping part, a screw stroke cavity, a slider, a slide rail and a hinge support, at least one pair of screw stroke cavities are provided, one of the screw stroke cavities is connected with the two-section self-resetting side wall unit through the slider, and the other screw stroke cavity is hinged with the surrounding soil through the hinge support, the slide rail is arranged on the two-section self-resetting side wall unit, and the slider is slidably connected in the slide rail,

[0011] The inerter part comprises a rotating mass disc, a ball screw and a ball nut, the ball screw is inserted into the screw stroke cavities connected with the slider and the hinge support at both ends, the rotating mass disc is arranged on the ball screw, and the ball nut is sleeved on the ball screw, at least one pair of ball nuts are arranged, and the ball nuts are embedded into the screw stroke cavities connected with the slider and the hinge support,

[0012] The eddy current damping part comprises a permanent magnet, at least one pair of permanent magnets are arranged on the screw stroke cavities connected with the slider and the hinge support and sleeved on the ball nut.

[0013] Further, the liquid storage tank comprises an inner tank, a dome is arranged on the inner tank, a two-section self-resetting side wall unit of the ground part is arranged outside the side wall of the inner tank, and an underground side wall of the underground part is arranged outside the side wall of the inner tank, a bottom plate is arranged below the bottom wall of the inner tank, the dome is connected with the two-section self-resetting side wall unit, the two-section self-resetting side wall unit is connected with the underground side wall, and the underground side wall is connected with the bottom plate.

[0014] Further, a heat insulation layer is arranged between the inner tank and the two-section self-resetting side wall unit, the underground side wall and the bottom plate.

[0015] Further, a diaphragm wall is arranged outside the underground side wall, and a rubber pad is arranged between the underground side wall and the diaphragm wall.

[0016] Further, the two-section self-resetting side wall unit comprises a self-resetting upper side wall and a self-resetting lower side wall connected in sequence, and the self-resetting upper side wall and the self-resetting lower side wall are anchored to the underground side wall through prestressed tendons.

[0017] As a preferred technical solution, the lower end of the self-resetting upper side wall and the self-resetting lower side wall is provided with a chamfer, which provides space for the swinging movement of the self-resetting upper side wall and the self-resetting lower side wall.

[0018] Further, a screw ball is arranged between the threads of the ball screw, the ball screw rotates relative to the ball nut through the screw ball, the screw ball can reduce the friction between the ball screw and the ball nut, facilitate the rotating movement, and the ball nut is rigidly connected with the screw stroke cavity.

[0019] Further, the permanent magnets are arranged on the opposite end faces of the screw stroke cavities connected with the slider and the hinge support, and the permanent magnets are rigidly connected with the ball nut and the screw stroke cavity.

[0020] Further, the rotating mass disc is arranged between the opposite permanent magnets and is rigidly connected with the ball screw, and the rotating mass disc comprises the conductor sheet and the non-conductor sheet arranged at intervals.

[0021] As a preferred technical solution, the material of the conductor sheet is selected from one or more of copper, copper alloy, aluminum and aluminum alloy.

[0022] As a preferred technical solution, one non-opposite end face of the screw stroke cavity is rigidly connected with the slider through the slider connecting rod, and the other non-opposite end face of the screw stroke cavity is hingedly connected with the hinge support through the hinge support connecting rod.

[0023] Further, the slide rail is provided with slide rail balls, the slider slides relative to the slide rail through the slide rail balls, and the slide rail balls can reduce the friction between the slider and the slide rail and facilitate relative sliding.

[0024] One of the technical solutions of the present application is to provide a damping method for a self-resetting semi-underground liquid storage tank with multiple damping units, which is used for damping the liquid storage tank, and the method comprises the following steps:

[0025] When an earthquake occurs, the seismic motion is transmitted to the underground continuous wall through the surrounding soil and further transmitted to the liquid storage tank, and the rubber pad arranged between the underground side wall and the underground continuous wall has good energy absorption and seismic isolation effect, which can effectively reduce the transmission of the seismic motion to the liquid storage tank.

[0026] The rubber pad cannot completely isolate the transmission of the seismic motion, so the underground side wall moves horizontally, the self-resetting lower side wall moves horizontally and swings, the hinge support provides space for the swing motion of the self-resetting lower side wall, the slide rail is rigidly connected with the self-resetting lower side wall and also moves in the same way, the slider moves along the axis of the slide rail in the slide rail, so that the slider and the hinge support move relative to each other, when the relative distance between the slider and the hinge support changes, the slider drives the ball nut and the screw stroke cavity to move relative to each other along the axis of the ball screw, and at the same time, the ball nut drives the ball screw and the rotating mass disc to rotate, thereby absorbing energy.

[0027] When the rotating mass disc rotates, the rotating motion of the conductor sheet cuts the magnetic induction lines of the permanent magnet to generate eddy current damping, thereby dissipating energy.

[0028] At the same time, under the action of the prestressed tendon, the self-resetting upper side wall and the self-resetting lower side wall can return to the original position after the earthquake.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] (1) Compared with the traditional semi-underground liquid storage tank structure, the two-section self-resetting side wall-electric eddy current damping-inerter device is provided, on the one hand, the above-ground side wall and the underground side wall are independently formed into two parts, and the two-section above-ground side wall is connected through prestressed tendons, so that the above-ground side wall becomes a self-resetting structure, which can restore to the initial position after an earthquake as a typical recoverable structure, eliminate residual deformation, eliminate stress concentration effect in the semi-underground liquid storage tank and improve the seismic toughness of the liquid storage tank; on the other hand, the electric eddy current damping-inerter unit can effectively absorb vibration energy and control structural effect, reduce the acceleration response of the sloshing liquid based on the acceleration-dependent inertial control force, and then reduce the combined response of the liquid and the structure of the liquid storage tank and improve the seismic toughness of the liquid storage tank; by using the restoring capacity of the self-resetting technology and the energy dissipation capacity of the inertial mass damper, the deformation capacity and energy absorption and dissipation capacity of the liquid storage tank side wall can be improved, the influence of stress concentration can be eliminated, and the combined response of the structure-liquid interaction system can be reduced and the seismic toughness of the semi-underground liquid storage tank structure can be improved;

[0031] (2) The rubber pad provided between the underground side wall of the liquid storage tank and the underground continuous wall can effectively absorb energy during an earthquake and reduce the response of the entire semi-underground liquid storage tank structure;

[0032] (3) The electric eddy current damping-inerter unit of the present application converts translation and swing into rotation, and converts it into damping force through the electric eddy current damping part, realizing energy absorption and dissipation;

[0033] (4) The present application constructs a double vibration energy isolation mechanism of rubber pad and two-section self-resetting side wall unit, realizes the energy disposal path of two-section self-resetting side wall swing energy absorption, inerter part efficiency energy absorption, and electric eddy current damping part efficiency energy dissipation, can effectively control the stress concentration phenomenon of the semi-buried underground liquid storage tank, reduce the comprehensive seismic response of the liquid storage tank base shear, bending moment, deformation and wave, and improve the seismic toughness of the semi-underground liquid storage tank structure;

[0034] (5) The two-section self-resetting side wall-electric eddy current damping-inerter device of the present application is convenient and flexible to install, easy to construct and replace, and can effectively isolate, absorb and dissipate vibration energy, ensuring the safety of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of a self-resetting semi-underground liquid storage tank with multiple damping units in the embodiments of the present application;

[0036] Figure 2 is a structural schematic diagram of a two-section self-resetting side wall-electric eddy current damping-inerter device in the embodiments of the present application;

[0037] Figure 3 Figure 1 is a structural schematic diagram of a two-section self-resetting side wall unit in an embodiment of the present application;

[0038] Figure 4 Figure 2 is a structural schematic diagram of an eddy current damping-mass unit in an embodiment of the present application;

[0039] Figure 5 Figure 3 is a structural schematic diagram of a rotating mass disc in an embodiment of the present application;

[0040] Figure 6 Figure 4 is a top view of the cooperation between a slider and a slide rail in an embodiment of the present application.

[0041] Marking in the figure:

[0042] 1 - dome, 2 - underground side wall, 3 - bottom plate, 4 - thermal insulation layer, 5 - inner tank, 6 - underground continuous wall, 7 - rubber pad, 8 - two-section self-resetting side wall-eddy current damping-mass device, 9 - self-resetting upper side wall, 10 - self-resetting lower side wall, 11 - prestressed tendon, 12 - rotating mass disc, 13 - ball screw, 14 - ball screw, 15 - permanent magnet, 16 - ball nut, 17 - screw stroke cavity, 18 - slider connecting rod, 19 - hinged support connecting rod, 20 - slider, 21 - slide rail, 22 - hinged support, 23 - conductor sheet, 24 - non-conductor sheet, 25 - slide rail ball. DETAILED DESCRIPTION

[0043] The present application will be described in detail below with specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present application, and detailed implementation and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements referred to in a particular orientation, constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are used to describe common objects, and only indicate different instances of the same object, and do not imply that the objects thus described must be in a given order, whether in time, space, order, or any other manner.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] Embodiment:

[0047] A self-resetting semi-underground liquid storage tank with multiple damping units, as shown in Figure 1 and Figure 2 The liquid storage tank is semi-buried in the ground, and the liquid storage tank is connected to the surrounding soil through a two-section self-resetting side wall-electric eddy current damping-inertial mass device 8, which includes a two-section self-resetting side wall unit and an electric eddy current damping-inertial mass unit. The two-section self-resetting side wall unit is provided outside the liquid storage tank and is connected to the surrounding soil through the electric eddy current damping-inertial mass unit,

[0048] The electric eddy current damping-inertial mass unit includes an inertial mass part, an electric eddy current damping part, a screw stroke cavity 17, a sliding block 20, a sliding rail 21, and a hinged support 22. The screw stroke cavity 17 is provided with at least one pair, one of which is connected to the two-section self-resetting side wall unit through the sliding block 20, and the other is hinged to the surrounding soil through the hinged support 22. The two-section self-resetting side wall unit is provided with a sliding rail 21, and the sliding block 20 is slidingly connected in the sliding rail 21,

[0049] The inertial mass part includes a rotating mass disc 12, a ball screw 13, and a ball nut 16. The ball screw 13 extends into the screw stroke cavity 17 connected to the sliding block 20 and the hinged support 22 at both ends, respectively. The rotating mass disc 12 is provided on the ball screw 13, and the ball nut 16 is sleeved on the ball screw 13. The ball nut 16 is provided with at least one pair, which is embedded into the screw stroke cavity 17 connected to the sliding block 20 and the hinged support 22, respectively,

[0050] The electric eddy current damping part includes a permanent magnet 15, which is provided with at least one pair, respectively arranged on the screw stroke cavity 17 connected to the sliding block 20 and the hinged support 22, and sleeved on the ball nut 16;

[0051] In this embodiment, the two-section self-resetting side wall unit is connected to the vertical side wall of the surrounding soil through the electric eddy current damping-inertial mass unit;

[0052] The liquid storage tank comprises an inner tank 5, a dome 1 arranged on the inner tank 5, a two-section self-resetting side wall unit of an above-ground part and an underground side wall 2 of an underground part arranged outside the side wall of the inner tank 5, and a bottom plate 3 arranged below the bottom wall of the inner tank 5, wherein the dome 1 is connected with the two-section self-resetting side wall unit, the two-section self-resetting side wall unit is connected with the underground side wall 2, and the underground side wall 2 is connected with the bottom plate 3;

[0053] In the embodiment, the inner tank 5 is a thin film type inner tank, the shape of the cross section of the thin film type inner tank is circular, the two-section self-resetting side wall unit of the above-ground part and the underground side wall 2 of the underground part are arranged outside the side wall of the inner tank 5, the dome 1 is rigidly connected with the upper end of the two-section self-resetting side wall unit, the two-section self-resetting side wall unit is vertically anchored on the underground side wall 2, and the lower end of the underground side wall 2 is rigidly connected with the bottom plate 3;

[0054] A heat insulation layer 4 is arranged between the inner tank 5 and the two-section self-resetting side wall unit, the underground side wall 2 and the bottom plate 3;

[0055] The underground side wall 2 is provided with a diaphragm wall 6, and a rubber pad 7 is arranged between the underground side wall 2 and the diaphragm wall 6;

[0056] In the embodiment, the rubber pad 7 is arranged between the underground side wall 2 and the diaphragm wall 6;

[0057] As shown in Figure 3 , the two-section self-resetting side wall unit comprises a self-resetting upper side wall 9 and a self-resetting lower side wall 10 connected in sequence, and the self-resetting upper side wall 9 and the self-resetting lower side wall 10 are anchored on the underground side wall 2 by prestressed tendons 11;

[0058] In the embodiment, the prestressed tendons 11 are prestressed steel bars, and the dome 1 is rigidly connected with the upper end of the self-resetting upper side wall 9;

[0059] The lower end of the self-resetting upper side wall 9 and the self-resetting lower side wall 10 is provided with a chamfer, so as to provide space for the swing movement of the self-resetting upper side wall 9 and the self-resetting lower side wall 10;

[0060] As shown in Figure 4 , the ball screws 14 are arranged between the threads of the ball screws 13, the ball screws 13 rotate relative to the ball nuts 16 through the ball screws 14, the ball screws 14 can reduce the friction between the ball screws 13 and the ball nuts 16, so as to facilitate the rotation, and the ball nuts 16 are rigidly connected with the screw stroke cavities 17;

[0061] The permanent magnets 15 are arranged on the end faces opposite to the screw stroke cavities 17 connected with the sliders 20 and the hinge supports 22, respectively, and the permanent magnets 15 are rigidly connected with the ball nuts 16 and the screw stroke cavities 17;

[0062] In the embodiment, the permanent magnet 15 is sleeved on the ball nut 16;

[0063] As shown in the figure, the rotating mass disc 12 is arranged between the opposite permanent magnets 15, and is rigidly connected with the ball screw 13, and includes the conductor sheet 23 and the non-conductor sheet 24 arranged at intervals; Figure 5

[0064] In the embodiment, the rotating mass disc 12 is circular in shape, and the conductor sheet 23 and the non-conductor sheet 24 are both fan-shaped;

[0065] The material of the conductor sheet 23 is selected from one or more of copper, copper alloy, aluminum and aluminum alloy, and in the embodiment, the material of the conductor sheet 23 is copper alloy, and the material of the non-conductor sheet 24 is ceramic;

[0066] One end face of the screw stroke cavity 17 is rigidly connected with the sliding block 20 through the sliding block connecting rod 18, and the other end face of the screw stroke cavity 17 is hingedly connected with the hinge support 22 through the hinge support connecting rod 19;

[0067] In the embodiment, one screw stroke cavity 17 is rigidly connected with the sliding block connecting rod 18, and the other screw stroke cavity 17 is rigidly connected with the hinge support connecting rod 19;

[0068] As shown in the figure, the slide rail 21 is provided with the slide rail ball 25, and the sliding block 20 slides relative to the slide rail 21 through the slide rail ball 25, and the slide rail ball 25 can reduce the friction between the sliding block 20 and the slide rail 21, and facilitate relative sliding; Figure 6 In the embodiment, the hinge support 22 is a spherical hinge, which can rotate at multiple angles, and when the earthquake propagates in different directions, the spherical hinge allows the screw stroke cavity 17 to move, and the outer vertical side wall of the self-resetting side wall 10 is rigidly connected with the slide rail 21, and the vertical side wall of the surrounding soil is rigidly connected with the hinge support 22.

[0069] A damping method for a self-resetting semi-underground liquid storage tank with multiple damping units, which is used for damping the above-mentioned liquid storage tank, and the specific steps are as follows:

[0070] When the earthquake occurs, the seismic motion is transmitted to the underground continuous wall 6 through the surrounding soil, and further to the liquid storage tank, and the rubber pad 7 arranged between the underground side wall 2 and the underground continuous wall 6 has good energy absorption and shock isolation effect, which can effectively reduce the transmission of the seismic motion to the liquid storage tank;

[0071]

[0072] ​​The rubber pad 7 cannot completely isolate the transmission of earthquake, so the underground side wall 2 moves horizontally, so that the self-resetting lower side wall 10 moves horizontally and swings, the hinged connection of the hinge support 22 provides space for the swing movement of the self-resetting lower side wall 10, the slide rail 21 is rigidly connected with the self-resetting lower side wall 10 and also moves in the same way, the slider 20 moves along the axis of the slide rail 21 in the slide rail 21, so that the slider 20 and the hinge support 22 move relatively, when the relative distance between the slider 20 and the hinge support 22 changes, the slider 20 drives the ball screw nut 16 and the ball screw rod stroke cavity 17 to move relatively along the axis of the ball screw rod 13, at the same time, the ball screw nut 16 drives the ball screw rod 13 and the rotating mass disc 12 to rotate, thereby absorbing energy;

[0073] When the rotating mass disc 12 rotates, the rotating movement of the conductor sheet 23 cuts the magnetic induction lines of the permanent magnet 15 to generate eddy current damping, thereby dissipating energy;

[0074] At the same time, under the action of the prestressed tendon 11, the self-resetting upper side wall 9 and the self-resetting lower side wall 10 can restore to the original position after the earthquake.

[0075] The above description of the embodiments is for the convenience of the ordinary skilled in the art to understand and use the invention. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present application without departing from the scope of the present application should be within the scope of protection of the present application.

Claims

1. A self-resetting semi-underground liquid storage tank having a multi-element shock absorbing unit, characterized by, The liquid storage tank is half-buried in the ground, the liquid storage tank is connected with the surrounding soil through a two-section self-resetting side wall-electric eddy current damping-inerter device (8), the two-section self-resetting side wall-electric eddy current damping-inerter device (8) includes a two-section self-resetting side wall unit and an electric eddy current damping-inerter unit, the outer side of the liquid storage tank is provided with the two-section self-resetting side wall unit, the two-section self-resetting side wall unit is connected with the surrounding soil through the electric eddy current damping-inerter unit, The electric eddy current damping-inerter unit includes an inerter part, an electric eddy current damping part, a screw stroke cavity (17), a sliding block (20), a sliding rail (21) and a hinged support (22), the screw stroke cavity (17) is provided with at least one pair, one screw stroke cavity (17) is connected with the two-section self-resetting side wall unit through the sliding block (20), the other screw stroke cavity (17) is hinged with the surrounding soil through the hinged support (22), the two-section self-resetting side wall unit is provided with the sliding rail (21), the sliding block (20) is slidingly connected in the sliding rail (21), The inerter part includes a rotating mass disc (12), a ball screw (13) and a ball nut (16), the two ends of the ball screw (13) respectively extend into the screw stroke cavities (17) connected with the sliding block (20) and the hinged support (22), the ball screw (13) is provided with the rotating mass disc (12), the ball screw (13) is sleeved with the ball nut (16), the ball nut (16) is provided with at least one pair, and is embedded into the screw stroke cavities (17) connected with the sliding block (20) and the hinged support (22) respectively, The electric eddy current damping part includes a permanent magnet (15), the permanent magnet (15) is provided with at least one pair, and is arranged on the screw stroke cavities (17) connected with the sliding block (20) and the hinged support (22) respectively and sleeved on the ball nut (16).

2. The self-resetting semi-underground liquid storage tank having a multi-element shock absorbing unit according to claim 1, characterized in that, The liquid storage tank includes an inner tank (5), the inner tank (5) is provided with a dome (1), the outer side wall of the inner tank (5) is provided with a two-section self-resetting side wall unit of an above-ground part and an underground side wall (2) of an underground part, the bottom wall of the inner tank (5) is provided with a bottom plate (3), the dome (1) is connected with the two-section self-resetting side wall unit, the two-section self-resetting side wall unit is connected with the underground side wall (2), and the underground side wall (2) is connected with the bottom plate (3).

3. The self-resetting semi-underground liquid storage tank having a plurality of shock absorbing units according to claim 2, wherein Heat insulation layers (4) are arranged between the inner tank (5) and the two-section self-resetting side wall unit, the underground side wall (2) and the bottom plate (3).

4. The self-resetting semi-underground liquid storage tank having a plurality of shock absorbing units according to claim 2, wherein The underground side wall (2) is provided with a diaphragm wall (6) outside, and a rubber pad (7) is arranged between the underground side wall (2) and the diaphragm wall (6).

5. The self-resetting semi-underground liquid storage tank having a plurality of shock absorbing units according to claim 4, wherein The two-section self-resetting side wall unit includes a self-resetting upper side wall (9) and a self-resetting lower side wall (10) connected in sequence, and the self-resetting upper side wall (9) and the self-resetting lower side wall (10) are anchored on the underground side wall (2) through prestressed tendons (11).

6. The self-resetting semi-underground liquid storage tank having a multi-element shock absorbing unit according to claim 1, characterized in that, The ball screw (13) is provided with a screw ball (14) between threads, and the ball screw (13) rotates relative to the ball nut (16) through the screw ball (14), and the ball nut (16) is rigidly connected with the screw stroke cavity (17).

7. The self-resetting semi-underground liquid storage tank having a plurality of shock absorbing units according to claim 5, wherein The permanent magnet (15) is arranged on the end face opposite to the screw stroke cavity (17) connected with the slider (20) and the hinge support (22), and the permanent magnet (15) is rigidly connected with the ball nut (16) and the screw stroke cavity (17).

8. The self-resetting semi-underground liquid storage tank having a plurality of shock absorbing units according to claim 7, wherein The rotating mass disc (12) is arranged between the opposite permanent magnets (15) and is rigidly connected with the ball screw (13), and includes the conductor sheet (23) and the non-conductor sheet (24) arranged at intervals.

9. The self-resetting semi-underground liquid storage tank having a multi-element shock absorbing unit according to claim 1, characterized in that, The slide rail (21) is provided with a slide rail ball (25), and the slider (20) slides relative to the slide rail (21) through the slide rail ball (25).

10. A shock absorbing method for a self-resetting semi-underground liquid storage tank having a multi-element shock absorbing unit, characterized by, The method is used for damping the liquid storage tank as claimed in claim 8, and the method comprises the following steps: When the earthquake occurs, the seismic motion is transmitted to the underground continuous wall (6) through the surrounding soil, and further transmitted to the liquid storage tank, and the rubber pad (7) arranged between the underground side wall (2) and the underground continuous wall (6) has the energy absorption and shock isolation effect, and reduces the transmission of the seismic motion to the liquid storage tank; The horizontal and swing compound motion of the self-resetting lower side wall (10) is caused by the horizontal motion of the underground side wall (2), the hinge connection mode of the hinge support (22) provides the space for the swing motion of the self-resetting lower side wall (10), the slide rail (21) is rigidly connected with the self-resetting lower side wall (10) and also generates the same motion, the relative motion of the slider (20) along the axis of the slide rail (21) in the slide rail (21) causes the relative motion of the slider (20) and the hinge support (22), when the relative distance of the slider (20) and the hinge support (22) changes, the slider (20) drives the screw stroke cavity (17) and the ball nut (16) to produce the relative displacement along the axis of the ball screw (13), and at the same time, the ball nut (16) drives the ball screw (13) and the rotating mass disc (12) to rotate, thereby absorbing the energy; When the rotating mass disc (12) rotates, the rotating motion of the conductor sheet (23) cuts the magnetic induction lines of the permanent magnet (15) to generate the eddy current damping, thereby dissipating the energy; At the same time, under the action of the prestressed tendon (11), the self-resetting upper side wall (9) and the self-resetting lower side wall (10) are restored to the original position after the earthquake.

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