Seismic isolation apparatus

Abstract

The present invention relates to a seismic isolation apparatus in which first and second seismic isolation units (310, 320) having a multilayer structure using a plurality of balls (313, 325) and an elastic pad (322) can be used to repeatedly attenuate vibrational energy transmitted to a structure foundation (20) when an earthquake occurs, and which can thus provide an even more improved seismic isolation function.

Description

Seismic isolation device

[0001] The present invention relates to a technology for a base isolation device that reduces vibration energy transmitted to structures such as buildings or facilities when an earthquake occurs.

[0002] When an earthquake occurs, vibrations are transmitted vertically and horizontally to structures such as buildings and facilities, and horizontal vibrations cause the structures to shake and twist violently.

[0003] If the magnitude of the transmitted vibration is large, it can partially damage the structure, reducing its stability and, in severe cases, even cause the structure to collapse.

[0004] To reduce damage to structures caused by earthquakes, various seismic isolation devices have been developed and used.

[0005] A seismic isolation device is a device that reduces the energy received by a structure by lengthening the period of vibration caused by an earthquake.

[0006] The matters described as background technology above are only intended to enhance understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled in the art.

[0007] The purpose of the present invention is to provide a seismic isolation device installed between a ground foundation and a structural foundation, which has a more improved seismic isolation function by applying a double-layer seismic isolation structure using a plurality of balls and elastic pads.

[0008] The seismic isolation device of the present invention for achieving the above object is characterized by including: a seismic isolation base fixed to a ground foundation; a foundation base coupled to a structural foundation; and a seismic isolation unit installed between the seismic isolation base and the foundation base to connect the seismic isolation base and the foundation base, configured in a double layer, and doubly attenuating vibration energy transmitted to the structural foundation when an earthquake occurs.

[0009] The above-mentioned seismic isolation unit is characterized by including a first seismic isolation unit that is fixed to be integral with the bottom of the seismic isolation base; and a second seismic isolation unit that is stacked on the first seismic isolation unit, connected to the foundation base, and capable of relative movement with respect to the first seismic isolation unit.

[0010] The vibration energy transmitted to the foundation of a structure when an earthquake occurs is characterized by being initially attenuated by the movement of the first base isolation unit and secondarily attenuated by the movement of the second base isolation unit.

[0011] The above first seismic isolation unit is characterized by including: a first plate fixed to the bottom of a seismic isolation base and having a plurality of first concave grooves formed on the upper surface; and a plurality of first balls inserted into each of the first concave grooves, and moving within the first concave grooves when the first plate moves due to an earthquake to attenuate vibration energy.

[0012] The above first concave groove is formed in an arc shape that is open upward, and is characterized by preventing movement and detachment of the first ball when an earthquake occurs and inducing the return of the first ball to its initial position.

[0013] The above-described seismic isolation base is characterized in that a stopper is fixed along the outer perimeter of a first plate at the bottom portion thereof; the first plate is inserted into a space between the stoppers so that the outer perimeter thereof is supported by the stoppers; and the seismic isolation base and the first plate are connected to each other as one body by the stoppers so that they move together in the forward-backward and left-right directions when an earthquake occurs.

[0014] The second seismic isolation unit is characterized by including: a second plate laminated on a first seismic isolation unit; an elastic pad laminated on the second plate; a third plate laminated on the elastic pad and having a plurality of second concave grooves formed on an upper surface; and a plurality of second balls, one of which is inserted into each of the second concave grooves, contacts the foundation base, and moves within the second concave grooves when the third plate moves due to an earthquake to attenuate vibration energy.

[0015] The above elastic pad is characterized by attenuating vibration energy in all directions: front-back, left-right, and up-down.

[0016] The above second concave groove is formed in an arc shape that is open upwards, and is characterized by preventing movement and detachment of the second ball when an earthquake occurs and inducing the return of the first ball to its initial position.

[0017] The above-mentioned seismic isolation base is characterized by including a floor portion fixed to a ground foundation; a wall portion protruding from the floor portion to form an outer perimeter; and a plurality of reinforcing bars connecting the floor portion and the wall portion.

[0018] The invention further comprises a support bar having one end fixed to a wall of the foundation base and the other end protruding toward the wall of the seismic isolation base while the bottom of the foundation base is supported by an isolation unit; a spring fitted to the support bar so as to surround the circumference of the support bar, one end of which is in contact with the wall of the foundation base and the other end of which is spaced apart from the wall of the seismic isolation base by a predetermined distance;

[0019] The above support bar and spring are characterized by being installed on all walls in the front, back, left, and right directions of the foundation base.

[0020] The spring is formed to be longer than the length of the support bar, so that when the base isolation base and foundation base move horizontally due to an earthquake, the other end of the spring comes into contact with the wall of the base isolation base before the support bar, thereby absorbing vibration energy through the elastic force of the spring.

[0021] The spring is continuously compressed while the other end of the spring is in contact with the wall of the seismic isolation base, and when the other end of the support bar comes into contact with the wall of the seismic isolation base, the horizontal movement of the foundation base is restricted, thereby restricting the horizontal movement of the structural foundation.

[0022] It is characterized by further including a cover member that wraps and protects the entire seismic isolation base, foundation base, and seismic isolation unit.

[0023] The upper surface of the above cover member is characterized in that a cover hole is formed so that the structural foundation penetrates through the cover hole.

[0024] The seismic isolation device according to the present invention has a configuration that uses first and second seismic isolation units of a double-layer structure using a plurality of balls and elastic pads to attenuate vibration energy transmitted to the foundation of a structure when an earthquake occurs in several stages, thereby having the effect of providing a more improved seismic isolation function.

[0025] Figure 1 is an exploded view of a seismic isolation device according to the present invention;

[0026] Fig. 2 is a cross-sectional view of the combined state of Fig. 1;

[0027] Figure 3 is a drawing for explaining the first and third plates according to the present invention.

[0028] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components are given the same reference numbers and redundant descriptions thereof will be omitted.

[0029] The suffixes "module" and "part" used for components in the following description are given or used interchangeably only for the convenience of writing specifications, and do not have distinct meanings or roles in themselves.

[0030] In describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description is omitted.

[0031] In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0032] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0033] When it is said that a component is "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but there may also be other components in between.

[0034] On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0035] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0036] In this specification, terms such as “includes” or “has” are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0037] In addition, the unit or control unit included in the names of motor control units (MCU) and hybrid control units (HCU) are terms widely used to name control devices (Controllers) that control vehicle-specific functions, and do not mean generic function units.

[0038] The controller may include a communication device that communicates with other controllers or sensors to control the function in charge, a memory that stores operating system or logic commands and input / output information, and one or more processors that perform judgments, calculations, decisions, etc. necessary for controlling the function in charge.

[0039] Below, a seismic isolation device according to a preferred embodiment of the present invention will be described.

[0040] The seismic isolation device according to the present invention may include, as illustrated in FIGS. 1 to 3, a seismic isolation base (100) fixed to a ground foundation (10); a foundation base (200) coupled to a structure foundation (20); and a seismic isolation unit (300) installed between the seismic isolation base (100) and the foundation base (200) to connect the seismic isolation base (100) and the foundation base (200), configured in a double layer, and doubly attenuating vibration energy transmitted to the structure foundation (100) when an earthquake occurs.

[0041] The ground foundation (10) can be a concrete foundation abutment connected to the ground or the ground.

[0042] The seismic isolation base (100) is preferably formed of a steel material with secured strength and rigidity, but is not limited thereto, and can be installed to be firmly fixed to the ground foundation (10) using a connecting member such as an anchor bolt.

[0043] The lower part of the structural foundation (20) is installed to be inserted into the foundation base (200), so that the lower part of the structural foundation (20) and the foundation base (200) can be combined to form an integrated structure.

[0044] The lower part of the structural foundation (20) can be installed by simply being inserted into the foundation base (200), and the lower part of the structural foundation (20) and the foundation base (200) can be connected using a connecting member as needed.

[0045] It is preferable that the lower part of the structural foundation (20) and the foundation base (200) be formed with the same cross-section for mutual connection, and can typically be formed with a square cross-section, a polygonal cross-section, or a circular cross-section.

[0046] The seismic isolation unit (300) is configured as a double-layer structure between the seismic isolation base (100) and the foundation base (200), so that when an earthquake occurs, the vibration energy transmitted to the structural foundation (20) is attenuated in the first and second stages, thereby providing the advantage of a more improved seismic isolation function.

[0047] The seismic isolation unit (300) according to the present invention includes a first seismic isolation unit (310) that is fixed to be integral with the bottom part (110) of the seismic isolation base (100); and a second seismic isolation unit (320) that is stacked on the first seismic isolation unit (310), connected to the foundation base (200), and capable of relative movement with respect to the first seismic isolation unit (310).

[0048] Looking at the drawing, the first seismic isolation unit (310) is installed on the bottom (110) of the seismic isolation base (100), and the second seismic isolation unit (320) is installed between the first seismic isolation unit (310) and the foundation base (200).

[0049] The first seismic isolation unit (310) and the second seismic isolation unit (320) are structures that can move relative to each other, so that when an earthquake occurs, the vibration energy transmitted to the structure foundation (20) can be initially attenuated by the movement of the first seismic isolation unit (310) and secondarily attenuated by the movement of the second seismic isolation unit (320).

[0050] The first seismic isolation unit (310) may include a first plate (312) fixed to the bottom (110) of the seismic isolation base (100) and having a plurality of first concave grooves (311) formed on the upper surface; and a plurality of first balls (313) inserted one at a time into each first concave groove (311) and moving within the first concave groove (311) when the first plate (312) moves due to an earthquake to attenuate vibration energy.

[0051] The first plate (312) can be formed as a rectangular flat plate with a predetermined cross-sectional thickness to a level that can secure strength and rigidity, but the outer shape can also be formed in various shapes as needed.

[0052] On the upper surface of the first plate (312), a plurality of first concave grooves (311) are formed at regular intervals, and the first concave grooves (311) can be formed in various shapes as long as they satisfy the conditions of smooth movement and prevention of detachment of the first ball (313), and for example, can be formed in an arc shape that is opened upward.

[0053] The first concave groove (311) can play a role in preventing movement and detachment of the first ball (313) in the event of an earthquake and in guiding the first ball (313) to return to its initial position.

[0054] The state in which the first ball (313) is located at the center of the first concave groove (311) can be defined as the initial position of the first ball (313).

[0055] That is, since the first concave groove (311) is formed in an arc shape, when an earthquake occurs, the first ball (313) always has a movement to move toward the center of the first concave groove (311), and as a result, the first concave groove (311) can play a role in returning the first ball (313) to its initial position, and as a result, the collapse of the structure can be prevented as much as possible.

[0056] The first ball (313) is a sphere with a cross-section formed in the shape of a garden, and is preferably formed of chrome material to ensure strength and rigidity, but is not limited thereto.

[0057] According to the present invention, a stopper (400) can be fixed along the outer perimeter of the first plate (312) to the bottom part (110) of the seismic isolation base (100).

[0058] The stopper (400) is formed of steel and can be welded to the bottom (110) of the seismic isolation base (100).

[0059] The stopper (400) can be welded to the bottom (110) of the seismic isolation base (100) to form a square frame that matches the outer shape of the first plate (312).

[0060] The first plate (312) can be installed so that it is inserted into the space between the stoppers (400) and its outer perimeter is supported by the stoppers (400), and accordingly, the seismic isolation base (100) and the first plate (312) are connected to each other as one body by the stoppers (400) so that they can move together in the forward and backward directions and left and right directions when an earthquake occurs.

[0061] When the first plate (312) is inserted into the space between the stoppers (400), the outer surface of the first plate (312) and the inner surface of the stopper (400) can be joined together in a forced fit manner to form an integrated structure.

[0062] Alternatively, a very small gap may exist between the first plate (312) and the stopper (400) so that the first plate (312) can be inserted into the space between the stoppers (400), but this small gap cannot be a factor that prevents the seismic isolation base (100) and the first plate (312) from becoming one, and accordingly, the seismic isolation base (100) and the first plate (312) can move together in the forward and backward directions and left and right directions when an earthquake occurs.

[0063] The second seismic isolation unit (320) may include a second plate (321) laminated on the first ball (313) of the first seismic isolation unit (310); an elastic pad (322) laminated on the second plate (321); a third plate (324) laminated on the elastic pad (322) and having a plurality of second concave grooves (323) formed on the upper surface; and a plurality of second balls (325) inserted one at a time into each second concave groove (323), contacting the foundation base (200), and moving within the second concave grooves (323) when the third plate (324) moves due to an earthquake to attenuate vibration energy.

[0064] The first ball (313) is installed in contact with the first plate (312) and the second plate (321) within the first concave groove (311), and when the first plate (312) moves due to an earthquake, it performs a rolling motion within the first concave groove (311).

[0065] The first plate (312), the second plate (321), and the third plate (324) may be formed of the same shape and material, but are not limited thereto.

[0066] Additionally, the first ball (313) and the second ball (325) may be formed with the same shape and material, but are not limited thereto.

[0067] The elastic pad (322) according to the present invention is a rubber pad made of a viscoelastic material, and is installed between the second plate (321) and the third plate (324). When vibration energy due to an earthquake is transmitted, it serves to attenuate the vibration energy through movements in the forward-backward, left-right, and up-down directions.

[0068] On the upper surface of the third plate (324), a plurality of second concave grooves (323) are formed at regular intervals, and the second concave grooves (323) can be formed in various shapes as long as they satisfy the conditions of smooth movement and prevention of detachment of the second ball (325), and for example, can be formed in an arc shape that is opened upward.

[0069] The second concave groove (323) can play a role in preventing movement and detachment of the second ball (325) in the event of an earthquake and in guiding the second ball (325) to return to its initial position.

[0070] The state in which the second ball (325) is located at the center of the second concave groove (323) can be defined as the initial position of the second ball (325).

[0071] That is, since the second concave groove (323) is formed in an arc shape, when an earthquake occurs, the second ball (325) always has a movement to move toward the center of the second concave groove (323), and as a result, the second concave groove (323) can play a role in returning the second ball (325) to its initial position, and as a result, the collapse of the structure can be prevented as much as possible.

[0072] In the present invention, it has been described that the vibration energy caused by an earthquake is first attenuated by the movement of the first seismic isolation unit (310) and the vibration energy is secondarily attenuated by the movement of the second seismic isolation unit (320). However, to explain in more detail, the vibration energy can be secondarily and thirdly attenuated by the movement of the second seismic isolation unit (320).

[0073] That is, when an earthquake occurs and the base isolation (100) and the first plate (312) move horizontally (front-backward, left-right, and lateral), the vibration energy transmitted to the second base isolation unit (320) can be primarily attenuated through the rolling motion of the first ball (313).

[0074] And, when the second plate (321) moves horizontally, the vibration energy transmitted to the third plate (324) can be secondarily attenuated through the forward-backward, left-right, and up-down movements of the elastic pad (322).

[0075] In addition, when the third plate (341) moves horizontally, the vibration energy transmitted to the foundation base (200) combined with the structural foundation (20) through the cloud movement of the second ball (325) can be attenuated in three stages.

[0076] If we look at the second seismic isolation unit (320) in detail like this, it can be seen that the vibration energy is attenuated in the second and third stages using the elastic pad (322) and the second ball (325), but if we look at the second seismic isolation unit (320) in a larger scope, it can be seen that the vibration energy is attenuated in the first stage in the first seismic isolation unit (310), and the vibration energy is attenuated in the second stage in the second seismic isolation unit (320).

[0077] The seismic isolation base (100) according to the present invention may include a floor portion (110) that is fixed to a ground foundation (10) via a connecting member such as an anchor bolt; a wall portion (120) that protrudes upward from the floor portion (100) to form an outer perimeter; and a plurality of reinforcing bars (130) that connect the floor portion (110) and the wall portion (120).

[0078] The bottom part (110) of the seismic isolation base (100) is formed as a flat plate and installed to form a contact with the ground foundation (10), and the wall part (120) can be formed to protrude upward from the bottom part (110) to form a square frame.

[0079] That is, the wall portion (120) of the seismic isolation base (100) is a structure in which four wall surfaces are connected to form a square structure, and each wall surface is arranged in the front, back, left, and right directions, and the upper part of the wall portion (120) is formed to be open.

[0080] The lower part of the structural foundation (20) in which the first and second base isolation units (310, 320) and the foundation base (200) are combined is installed so that it is inserted into the wall (120) of the base isolation base (100) through the open upper part of the wall (120).

[0081] The reinforcing bar (130) serves to reinforce the wall portion (120) so that it is perpendicular to the floor portion (110), and in particular, when the support bar (500) and spring (600) described later come into contact with the wall portion (120) of the seismic isolation base (100), it serves to maintain the supporting force of the wall portion (120), thereby preventing collapse or damage to the wall portion (120).

[0082] The seismic isolation device according to the present invention may further include a support bar (500) having one end fixed to a wall portion (210) of the foundation base (200) and the other end protruding toward a wall portion (120) of the seismic isolation base (100) while the bottom of the foundation base (200) is supported by a seismic isolation unit (300); and a spring (600) fitted into the support bar (500) so as to surround the circumference of the support bar (500), such that one end contacts the wall portion (210) of the foundation base (200) and the other end is spaced apart from the wall portion (120) of the seismic isolation base (100) by a predetermined distance.

[0083] The support bar (500) and spring (600) can play a role in preventing collapse of the structure by limiting horizontal movement of the structure foundation (200) through contact with the wall portion (120) of the seismic isolation base (100) when the vibration energy due to an earthquake is large and the base isolation base (100) and the structure foundation (200) move excessively in the horizontal direction.

[0084] The support bar (500) may be formed as a steel round bar with a circular cross-section, and the spring (600) may be formed as a high-elasticity spring, but is not limited thereto.

[0085] The spring (600) is installed so as to wrap around the circumference of the support bar (500), so that one end is supported by contacting the wall (210) of the foundation base (200), and the other end is installed so as to exist as a free end spaced apart from the wall (120) of the seismic isolation base (100) by a predetermined distance.

[0086] The support bar (500) and spring (600) must be able to restrain all horizontal movements (front-backward and left-right directions) of the base isolation base (100) and the structural foundation (200). To this end, it is preferable that the support bar (500) and spring (600) are installed on all wall sections (210) in the front-back, left-right, and right directions of the foundation base (200).

[0087] In a situation where the base isolation base (100) and the structural foundation (200) move horizontally due to an earthquake, when the other end of the spring (600) comes into contact with the wall (120) of the base isolation base (100), the spring (600) is compressed, and at this time, the support bar (500) can play a role in guiding the movement of the spring (600) in response to the longitudinal deformation of the spring (600).

[0088] The seismic isolation device according to the present invention is characterized in that the length of the spring (600) is formed longer than the length of the support bar (500) protruding from the wall portion (21) of the foundation base (200), so that when the seismic isolation base (100) and the foundation base (200) move in the horizontal direction (front-backward direction and left-right direction) due to an earthquake, the other end of the spring (600) comes into contact with the wall portion (120) of the seismic isolation base (100) before the support bar (500) and is compressed, and vibration energy can be absorbed by the elastic force of the compressed spring (600), thereby further strengthening the seismic isolation function.

[0089] And, when the compression of the spring (600) continues while the other end of the spring (600) is in contact with the wall (120) of the seismic isolation base (100), and the other end of the support bar (500) comes into contact with the wall (120) of the seismic isolation base (100), the horizontal movement of the foundation base (200) is restricted, so that excessive horizontal movement of the structural foundation (20) can be restrained, thereby preventing collapse or damage to the structure.

[0090] The seismic isolation device according to the present invention may further include a cover member (700) that surrounds and protects the entire seismic isolation base (100), foundation base (200), and seismic isolation unit (300).

[0091] The cover member (700) is formed in a rectangular parallelepiped shape with an open lower side, and can be installed to cover the entire base (100), foundation base (200), and base isolation unit (300).

[0092] It is preferable that the cover member (700) be a waterproof cover with a waterproof function, and through this, it is preferable to prevent moisture penetration into the seismic isolation unit (300) as much as possible to ensure smooth operation of the seismic isolation unit (300).

[0093] According to the present invention, a cover hole (710) is formed on the upper surface of the cover member (700), so that the structural foundation (20) can be installed through the cover hole (710).

[0094] In order to maintain the waterproof function of the cover member (700), a rubber pad may be combined along the edge of the cover hole (710), and the pad may be in contact with the surface of the structural foundation (20) to eliminate the gap between the cover hole (710) and the structural foundation (20).

[0095] As described above, the seismic isolation device according to the present invention has a configuration that uses first and second seismic isolation units (310, 320) of a double-layer structure using a plurality of balls (313, 325) and elastic pads (322) to attenuate vibration energy transmitted to the structural foundation (20) when an earthquake occurs in several stages, thereby having the advantage of being able to have a more improved seismic isolation function.

[0096] Although the present invention has been illustrated and described with respect to specific embodiments, it will be apparent to those skilled in the art that the present invention may be variously improved and modified without departing from the technical spirit of the invention as defined by the following claims.

[0097] [Explanation of symbols]

[0098] 10 - Ground foundation

[0099] 20 - Structural Foundations

[0100] 100 - Seismic isolation base

[0101] 110 - Bottom

[0102] 120 - Wall

[0103] 130 - Reinforcement

[0104] 200 - Basic Base

[0105] 210 - Wall

[0106] 300 - Seismic isolation unit

[0107] 310 - 1st seismic isolation unit

[0108] 311 - 1st concave groove

[0109] 312 - Plate 1

[0110] 313 - Ball 1

[0111] 320 - Second Seismic Isolation Unit

[0112] 321 - Second Plate

[0113] 322 - Elastic Pad

[0114] 323 - Second concave groove

[0115] 324 - Third Plate

[0116] 325 - Second ball

[0117] 400 - Stopper

[0118] 500 - Support Bar

[0119] 600 - Spring

[0120] 700 - Cover member

[0121] 710 - Cover hole

Claims

1. Seismic isolation base fixed to the ground foundation; Foundation base combined with the structural foundation; and A seismic isolation device characterized by including a seismic isolation unit which is installed between the seismic isolation base and the foundation base to connect the seismic isolation base and the foundation base, is configured as a double layer, and double-damps vibration energy transmitted to the foundation of a structure when an earthquake occurs.

2. In claim 1, The above seismic isolation unit is a first seismic isolation unit that is fixed to be integral with the bottom of the seismic isolation base; and A seismic isolation device characterized by including a second seismic isolation unit that is laminated on the first seismic isolation unit, connected to a foundation base, and capable of relative movement with respect to the first seismic isolation unit.

3. In claim 2, A base isolation device characterized in that the vibration energy transmitted to the foundation of a structure when an earthquake occurs is first attenuated by the movement of the first base isolation unit and secondarily attenuated by the movement of the second base isolation unit.

4. In claim 2, The above first seismic isolation unit is a first plate fixed to the bottom of the seismic isolation base and having a plurality of first concave grooves formed on the upper surface; and A seismic isolation device characterized by including a plurality of first balls, one of which is inserted into each of the first concave grooves, and which move within the first concave grooves when the first plate moves due to an earthquake and attenuates vibration energy.

5. In claim 4, A seismic isolation device characterized in that the first concave groove is formed in an arc shape that is open toward the top, thereby preventing movement and detachment of the first ball and inducing the return of the first ball to its initial position when an earthquake occurs.

6. In claim 4, A stopper is fixed along the outer perimeter of the first plate at the bottom of the above seismic isolation base; The above first plate is installed so that it is inserted into the space between the stoppers and its outer periphery is supported by the stoppers; A seismic isolation device characterized in that the above-mentioned seismic isolation base and the first plate are connected to each other as one unit by a stopper so that they move together in the forward-backward and left-right directions when an earthquake occurs.

7. In claim 2, The above second seismic isolation unit is a second plate laminated on the first seismic isolation unit; An elastic pad laminated on the second plate; A third plate laminated on the elastic pad and having a plurality of second concave grooves formed on the upper surface; and A seismic isolation device characterized by including a plurality of second balls, each of which is inserted into each of the second concave grooves, comes into contact with the foundation base, and moves within the second concave grooves to attenuate vibration energy when the third plate moves due to an earthquake.

8. In claim 7, A seismic isolation device characterized in that the above elastic pad damps vibration energy in all of the forward-backward, left-right, and up-down directions.

9. In claim 7, A seismic isolation device characterized in that the second concave groove is formed in an arc shape that is open toward the top, thereby preventing movement and detachment of the second ball and inducing the return of the second ball to its initial position when an earthquake occurs.

10. In claim 1, The above seismic isolation base is a floor part fixed to the ground foundation; A wall portion protruding from the floor portion to form an outer perimeter; and A seismic isolation device characterized by including a plurality of reinforcing bars connecting the floor portion and the wall portion.

11. In claim 1, A support bar having one end fixed to the wall of the foundation base and the other end protruding toward the wall of the seismic isolation base while the bottom surface of the above foundation base is supported by the seismic isolation unit; A base isolation device characterized by further including a spring, which is fitted to a support bar so as to surround the perimeter of the support bar, has one end in contact with the wall of the foundation base, and the other end is spaced apart from the wall of the base isolation by a predetermined distance.

12. In claim 11, A seismic isolation device characterized in that the above support bars and springs are installed on all walls in the forward, backward, left, and right directions from the foundation base.

13. In claim 11, A seismic isolation device characterized in that the length of the spring is formed longer than the length of the support bar, so that when the seismic isolation base and foundation base move horizontally due to an earthquake, the other end of the spring comes into contact with the wall of the seismic isolation base before the support bar, thereby absorbing vibration energy through the elasticity of the spring.

14. In claim 13, A seismic isolation device characterized in that the horizontal movement of the foundation is restricted by restricting the horizontal movement of the foundation when the other end of the spring is in contact with the wall of the seismic isolation base and the compression of the spring continues so that the other end of the support bar is in contact with the wall of the seismic isolation base.

15. In claim 1, An isolation device characterized by further including a cover member that surrounds and protects the entire isolation base, foundation base, and isolation unit.

16. In claim 15, A seismic isolation device characterized in that a cover hole is formed on the upper surface of the cover member and the structural foundation penetrates through the cover hole.

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