Non-overturning seismic isolation apparatus considering beyond-design-basis-earthquake

Abstract

A non-overturning seismic isolation apparatus considering a beyond-design-basis-earthquake, according to the present invention, comprises: an upper plate (1) fixedly provided on the bottom surface of a facility (F) to be protected, which is to be isolated from seismic force when an earthquake occurs; a lower plate (3) fixed on the ground or a structure fixed to the ground; and a seismic isolation means (5) which is provided between the upper plate (1) and the lower plate (3), and which slides, when the lower plate (3) is moved in the horizontal direction by the seismic force when the earthquake occurs, the upper plate (1) so as to damp the seismic force transmitted to the facility (F) to be protected. Therefore, the non-overturning seismic isolation apparatus considering a beyond-design-basis-earthquake, according to the present invention, can damp the seismic force applied to the facility (F) to be protected when the earthquake occurs.

Description

Nonconductive seismic isolation device considering over-design earthquakes

[0001] The present invention relates to a non-conductive seismic isolation device that takes into account over-design earthquakes, and more specifically, to an invention capable of attenuating seismic forces transmitted to equipment under protection and preventing the equipment under protection from being overturned by seismic forces.

[0002] (This patent is a patent supported by the Technology Innovation Development Project of the Ministry of SMEs and Startups (RS-2023-00269853))

[0003] Generally, earthquake-resistant structures include seismic-resistant structures, seismic-isolating structures, and seismic-controlling structures.

[0004] Seismic resistance is the ability to withstand earthquakes.

[0005] In addition, seismic isolation refers to the protection of upper facilities from earthquakes or vibrations, and includes vertical seismic isolation, which is free from the vertical forces of earthquakes or vibrations; horizontal seismic isolation, which is free from the horizontal forces of earthquakes or vibrations; and horizontal and vertical seismic isolation, which is free from both the horizontal and vertical forces of earthquakes or vibrations.

[0006] Seismic damping is the damping or control of vertical and horizontal forces caused by earthquakes or vibrations.

[0007] The magnitude of seismic forces affecting buildings during an earthquake varies depending on the structural characteristics of the building and affects advanced equipment installed inside.

[0008] In particular, electrical, communication, control and instrumentation, computer, and mechanical equipment, which are highly sensitive to high-energy seismic vibrations and vibrations caused by external shocks, are non-structural materials and thus have limits to their ability to withstand earthquakes. Since it is difficult to ensure stability by applying seismic design to the equipment itself, seismic isolation devices are being developed to protect these facilities from earthquakes.

[0009] In existing seismic isolation devices, a shaft and a slide block are installed to slide the equipment to be protected when seismic force occurs, thereby minimizing movement.

[0010] However, existing seismic isolation devices had problems sliding the equipment to be protected because the load of the equipment to be protected was concentrated on the shaft, causing the shaft to deform, or the linear ball bearing installed inside the slide block was damaged.

[0011] Meanwhile, as prior art to the present invention, the "displacement-controlled seismic isolation system with anti-overturning performance" of application number "10-2023-0059122" was patented and subsequently registered by the present applicant. The displacement-controlled seismic isolation system with anti-overturning performance comprises an upper plate coupled to the bottom surface of a protected object, a bottom plate fixed to the bottom surface, a square frame inserted between the upper plate and the bottom plate and fixedly installed on the bottom plate, and first and second sliding means installed within the square frame that slide the upper plate when a horizontal seismic force occurs to prevent the horizontal seismic force from being transmitted to the protected object.

[0012] The above first and second sliding means include a shaft and a slide block.

[0013] The above linear technology also had a problem in implementing seismic isolation performance because if the load of the object to be protected was excessive, the load was concentrated on the slide block and the shaft, causing the shaft to deform or sag, and damaging the linear ball bearing installed inside the slide block.

[0014] Accordingly, the present invention aims to solve the above problem by providing a non-conductive seismic isolation device that takes into account an over-design earthquake capable of attenuating seismic forces transmitted to protected facilities when an earthquake occurs.

[0015] In addition, another objective of the present invention is to provide a non-conductive seismic isolation device that takes into account an over-design earthquake, which can prevent deformation or damage to the slide block, shaft, and linear ball bearing installed inside the slide block when the load of the equipment to be protected is concentrated on the slide block and shaft when configuring a seismic isolation device using a shaft and a slide block.

[0016] In addition, another objective of the present invention is to provide a non-conductive seismic isolation device that takes into account an over-design earthquake, wherein when a seismic isolation device is configured using a shaft and a slide block, low-elasticity rubber cushions are inserted at both ends of the shaft so that when an over-design earthquake occurs, the slide block exceeds the design movement distance and collides with the ends of the shaft, the low-elasticity rubber cushions absorb impact energy to attenuate the seismic force and prevent the overturning of the protected equipment.

[0017] The nonconductive seismic isolation device for considering an over-design earthquake according to the present invention for achieving the above purpose comprises: an upper plate (1) fixedly installed on the bottom surface of a protected facility (F) to be isolated from seismic force when an earthquake occurs; a lower plate (3) fixed on the ground or a structure fixed to the ground; and a seismic isolation means (5) installed between the upper plate (1) and the lower plate (3) and sliding the upper plate (1), which is integrally coupled with the protected facility (F), to attenuate the seismic force transmitted to the protected facility (F) when the lower plate (3) moves horizontally due to seismic force when an earthquake occurs. The above seismic isolation means (5) comprises a lower frame (7) fixedly installed on the lower plate (3), an upper frame (9) installed between the upper plate (1) and the lower frame (7), a vertical sliding means (15) installed on the lower frame (7) and sliding the upper frame (9) when seismic force acting in the vertical direction of the lower plate (3) occurs, a plurality of upper frame support bearings (11) with two or more shaft-fixed to the lower frame (7) to support the upper frame (9) and rolling by friction with the bottom surface of the upper frame (9), a horizontal sliding means (17) installed on the upper frame (9) and sliding the upper plate (1) when seismic force acting in the horizontal direction of the lower plate (3) occurs, a plurality of upper plate support bearings (13) with two or more shaft-fixed to the upper frame (9) to support the upper plate (1) and rolling by friction with the bottom surface of the upper plate (1), and between the lower plate (3) and the upper frame (9), and the upper It includes a restoration means (19) installed between the frame (9) and the top plate (1) and, when the seismic force disappears, uses elastic restoring force to restore the arrangement state of the bottom plate (3), the upper frame (9), and the top plate (1) to the arrangement state before the seismic force occurred.

[0018]

[0019] The non-conductive seismic isolation device for considering an over-design earthquake according to the present invention, configured in this way, can attenuate the seismic force applied to the protected facility (F) when an earthquake occurs.

[0020] In addition, the present invention can prevent the upper LBB shaft (41) and the lower LBB (Linear Ball Bearing) shaft (23) from sagging due to the load of the equipment to be protected (F) by installing an upper plate support bearing (13) capable of distributing the load of the equipment to be protected (F) on the upper frame (9) and installing an upper frame support bearing (11) capable of distributing the load of the equipment to be protected (F) on the lower frame (7).

[0021] In addition, the present invention can prevent sagging of the upper LBB shaft (41) and the lower LBB shaft (23), thereby preventing deformation or damage to the upper linear ball bearing (45) and the lower linear ball bearing (27) respectively installed in the upper slide block (43) and the lower slide block (25), and can ensure linear movement of the upper slide block (43) and the lower slide block (25).

[0022] In addition, when the upper slide block (43) and the lower slide block (25) slide when an earthquake occurs, the lower tension spring (33) and the upper tension spring (51) are compressed or expanded to control the displacement of the protected equipment (F).

[0023] In addition, when an earthquake exceeding the design occurs, the upper slide block (43) reaches the end of the upper LBB shaft (41) or the lower slide block (25) reaches the end of the lower LBB shaft (23), the upper low-elasticity rubber cushion (47) or the lower low-elasticity rubber cushion (29) absorbs the shock, thereby preventing the invention from being damaged or separated.

[0024] In addition, the present invention can prevent the overturning of the protected equipment (F) by allowing the upper slide block (43) to reach the end of the upper LBB shaft (41) or the lower slide block (25) to reach the end of the lower LBB shaft (23) when an overturning moment occurs due to the occurrence of an earthquake exceeding the design distance, by allowing the upper LBB shaft (41) and the lower LBB shaft (23) to resist the overturning moment through their own internal strength.

[0025] In addition, the present invention allows the upper tension spring (51) and the lower tension spring (33) to elastically restore the upper slide block (43) and the lower slide block (25) to their original positions when the seismic force disappears after the seismic force is generated, and simultaneously allows the protected equipment (F) to return to its original position.

[0026] Drawing 1 is a drawing illustrating the present invention with the protected equipment installed.

[0027] Drawing 2 is a combined perspective view of the present invention,

[0028] Figure 3 is a drawing illustrating the present invention with the top plate separated.

[0029] Figure 4 is an exploded perspective view of the present invention,

[0030] Drawing 5 is a drawing illustrating the state of the present invention when the bottom plate, the lower frame, and the upper frame have moved the maximum movement distance in the horizontal direction of the bottom plate during an earthquake.

[0031] Drawing 6 is a drawing illustrating the state of the present invention when the bottom plate and the lower frame have moved the maximum movement distance in the longitudinal direction of the bottom plate during an earthquake.

[0032] Drawing 7 is a drawing illustrating the state of the present invention when, during an earthquake, the bottom plate, the lower frame, and the upper frame move the maximum movement distance in the horizontal direction of the bottom plate, and the bottom plate and the lower frame move the maximum movement distance in the vertical direction of the bottom plate.

[0033] *Explanation of symbols*

[0034] F. Protected Equipment 1. Top Plate

[0035] 3. Bottom plate 5. Seismic isolation means

[0036] 7. Lower frame 9. Upper frame

[0037] 11. Upper frame support bearing 13. Top plate support bearing

[0038] 15. Vertical sliding means 17. Horizontal sliding means

[0039] 19. Means of return to original state 21. Lower LBB shaft fixing frame

[0040] 23. Lower LBB shaft 25. Lower slide block

[0041] 27. Lower linear ball bearing 29. Lower low-elasticity rubber cushion

[0042] 31. Lower return means 33. Lower tension spring

[0043] 35. Lower tension spring fixing means 37. Upper LBB shaft fixing frame

[0044] 39. Intermediate connecting frame 41. Upper LBB shaft

[0045] 43. Upper slide block 45. Upper linear ball bearing

[0046] 47. Upper low-elasticity rubber cushion 49. Upper means of returning to original state

[0047] 51. Upper tension spring 53. Upper tension spring fixing means

[0048] The present invention will be described in detail below with reference to the attached drawings.

[0049] As illustrated in Drawings 1 and 2, the non-conductive seismic isolation device for considering an over-design earthquake according to the present invention comprises: an upper plate (1) fixedly installed on the bottom surface of a protected facility (F) to be isolated from seismic force when an earthquake occurs; a lower plate (3) fixed on the ground or a structure fixed to the ground; and a seismic isolation means (5) installed between the upper plate (1) and the lower plate (3) and sliding the upper plate (1), which is integrally coupled with the protected facility (F), to attenuate the seismic force transmitted to the protected facility (F) when the lower plate (3) moves horizontally due to seismic force when an earthquake occurs.

[0050] As illustrated in Drawings 3 and 4, the seismic isolation means (5) comprises: a lower frame (7) fixedly installed on the lower plate (3); an upper frame (9) installed between the upper plate (1) and the lower frame (7); a vertical sliding means (15) installed on the lower frame (7) to slide the upper frame (9) when seismic force acting in the vertical direction of the lower plate (3) occurs; two or more upper frame support bearings (11) axially fixed to the lower frame (7) to support the upper frame (9) and rolling by friction with the bottom surface of the upper frame (9); a horizontal sliding means (17) installed on the upper frame (9) to slide the upper plate (1) when seismic force acting in the horizontal direction of the lower plate (3) occurs; two or more upper plate support bearings (13) axially fixed to the upper frame (9) to support the upper plate (1) and rolling by friction with the bottom surface of the upper plate (1); and the It includes a restoration means (19) installed between the bottom plate (3) and the upper frame (9), and between the upper frame (9) and the top plate (1), which uses elastic restoring force to restore the arrangement state of the bottom plate (3), the upper frame (9), and the top plate (1) to the arrangement state before the seismic force was generated when the seismic force disappears.

[0051] As shown in Drawing 4, the lower frame (7) is in the shape of a rectangular prism with an open top surface and includes a pair of lower LBB shaft fixing frames (21) laid parallel to each other in the vertical direction of the lower plate (3) on the lower plate (3), and the upper frame support bearing (11) is axially fixed to the left and right sides of the lower LBB shaft fixing frames (21).

[0052] The above LBB stands for Linear Ball Bearing, meaning a linear ball bearing.

[0053] As shown in Figure 4, the above vertical sliding means (15) includes a lower LBB shaft (23) that is installed in a 1:1 ratio within a pair of lower LBB shaft fixing frames (21) and is laid in the vertical direction of the lower LBB shaft fixing frames (21), with both ends fixedly installed on the front and rear of the lower LBB shaft fixing frames (21); a lower slide block (25) that is fitted into the lower LBB shaft (23) and fixedly coupled to the bottom surface of the upper frame (9); and a lower linear ball bearing (27) that is fitted into the lower LBB shaft (23) and fixedly coupled to the lower slide block (25) to slide the lower slide block (25) in the longitudinal direction of the lower LBB shaft (23).

[0054] Two lower slide blocks (25) are installed on one of the lower LBB shafts (23).

[0055] As shown in Drawing 4, lower low-elasticity rubber cushions (29) are fitted to both ends of the lower LBB shaft (23) to cushion the impact when colliding with the lower slide block (25).

[0056] As shown in Figures 3 and 4, the above-mentioned restoration means (19) includes a lower restoration means (31) connected between the lower plate (3) and the upper frame (9) and which restores the arrangement between the lower plate (3) and the upper frame (9) to its original state using elastic restoring force when the seismic force acting in the vertical direction of the lower plate (3) disappears.

[0057] As shown in Drawings 3 and 4, the lower original return means (31) includes a pair of lower tension springs (33) that are positioned between the lower frame (7) and are laid parallel to each other in the vertical direction of the lower frame (7), and a lower tension spring fixing means (35) that fixes one end of the lower tension spring (33) to one surface of the upper frame (9) and fixes the other end of the lower tension spring (33) to one surface of the lower plate (3).

[0058] When one lower tension spring (33) positioned on the left side of the lower frame (7) expands, another lower tension spring (33) positioned on the right side of the lower frame (7) contracts.

[0059] As shown in Drawings 3 and 4, the upper frame (9) is in the form of a rectangular prism with an open top surface and includes a pair of upper LBB shaft fixing frames (37) installed between the upper plate (1) and the lower frame (7) and laid parallel to each other in the horizontal direction of the lower plate (3), and a pair of intermediate connecting frames (39) laid parallel to each other in the vertical direction of the lower plate (3) between the pair of upper LBB shaft fixing frames (37), with both ends fixedly connected to the outer surface of each pair of upper LBB shaft fixing frames (37), and a plurality of upper plate support bearings (13) are axially fixed to the front and rear of the upper LBB shaft fixing frames (37).

[0060] The upper frame support bearing (11) is rotated axially by friction with the bottom surface of the intermediate connecting frame (39) or the bottom surface of the upper LBB shaft fixing frame (37) that is in contact with the boundary of the intermediate connecting frame (39).

[0061] As illustrated in Drawings 3 and 4, the above horizontal sliding means (17) includes an upper LBB shaft (41) that is installed in a 1:1 ratio within a pair of upper LBB shaft fixing frames (37), is laid horizontally in the horizontal direction of the upper LBB shaft fixing frames (37), and has both ends fixedly installed on the left and right sides of the upper LBB shaft fixing frames (37); an upper slide block (43) that is fitted into the upper LBB shaft (41) and fixedly coupled to the top plate (1); and an upper linear ball bearing (45) that is fitted into the upper LBB shaft (41) and fixedly coupled to the upper slide block (43) to slide the upper slide block (43) in the longitudinal direction of the upper LBB shaft (41).

[0062] Two upper slide blocks (43) are installed on one of the upper LBB shafts (41).

[0063] As shown in Figures 3 and 4, upper low-elasticity rubber cushions (47) are fitted to both ends of the upper LBB shaft (41) to cushion the impact when colliding with the upper slide block (43).

[0064] As shown in Figures 3 and 4, the above-mentioned restoration means (19) includes an upper restoration means (49) connected between the top plate (1) and the upper frame (9) and which restores the arrangement between the top plate (1) and the upper frame (9) to its original state using elastic restoring force when the seismic force acting in the horizontal direction of the bottom plate (3) disappears.

[0065] As shown in Drawings 3 and 4, the upper original return means (49) includes a pair of upper tension springs (51) positioned parallel to each other in the horizontal direction of the upper frame (9) with the upper frame (9) in between, and an upper tension spring fixing means (53) that fixes one end of the upper tension spring (51) to one surface of the upper frame (9) and fixes the other end of the upper tension spring (51) to one surface of the top plate (1).

[0066] When one upper tension spring (51) positioned at the front of the upper frame (9) is expanded, another upper tension spring (51) positioned at the rear of the upper frame (9) is contracted.

[0067] As shown in Drawing 4, a square hole (H) is formed through the center of the upper plate (1) and lower plate (3).

[0068] Drawing 5 is a drawing illustrating the state of the present invention when the lower plate (3), the lower frame (7), and the upper frame (9) move the maximum movement distance in the horizontal direction of the lower plate (3) when an earthquake force is generated in the horizontal direction of the lower plate (3), and Drawing 6 is a drawing illustrating the state of the present invention when the lower plate (3) and the lower frame (7) move the maximum movement distance in the vertical direction of the lower plate (3) when an earthquake force is generated in the vertical direction of the lower plate (3).

[0069] Drawing 7 is a drawing illustrating the state of the present invention when seismic force is generated in the horizontal and vertical directions of the bottom plate (3), and the bottom plate (3), the lower frame (7), and the upper frame (9) move the maximum movement distance in the horizontal direction of the bottom plate (3) and the bottom plate (3) and the lower frame (7) move the maximum movement distance in the vertical direction of the bottom plate (3).

[0070] The non-conductive seismic isolation device for considering an over-design earthquake according to the present invention, configured in this way, can attenuate the seismic force applied to the protected facility (F) when an earthquake occurs.

[0071] In addition, the present invention can prevent the upper LBB shaft (41) and the lower LBB shaft (23) from sagging due to the load of the protected equipment (F) by installing an upper plate support bearing (13) capable of distributing the load of the protected equipment (F) on the upper frame (9) and installing an upper frame support bearing (11) capable of distributing the load of the protected equipment (F) on the lower frame (7).

[0072] In addition, the present invention can prevent sagging of the upper LBB shaft (41) and the lower LBB shaft (23), thereby preventing deformation or damage to the upper linear ball bearing (45) and the lower linear ball bearing (27) respectively installed in the upper slide block (43) and the lower slide block (25), and can ensure linear movement of the upper slide block (43) and the lower slide block (25).

[0073] In addition, when the upper slide block (43) and the lower slide block (25) slide when an earthquake occurs, the lower tension spring (33) and the upper tension spring (51) are compressed or expanded to control the displacement of the protected equipment (F).

[0074] In addition, when an earthquake exceeding the design occurs, the protected equipment (F) exceeds the design travel distance and one of the upper slide blocks (43) reaches the end of the upper LBB shaft (41) or one of the lower slide blocks (25) reaches the end of the lower LBB shaft (23), the upper low-elasticity rubber cushion (47) or the lower low-elasticity rubber cushion (29) absorbs the shock, thereby preventing the present invention from being damaged or separated.

[0075] In addition, the present invention can prevent the overturning of the protected equipment (F) by having the upper LBB shaft (41), the upper slide block (43), the lower LBB shaft (23), and the lower slide block (25) resist the overturning moment through their own internal strength when the protected equipment (F) exceeds the designed travel distance due to the occurrence of an earthquake exceeding the design, causing the upper slide block (43) to reach the end of the upper LBB shaft (41) or the lower slide block (25) to reach the end of the lower LBB shaft (23).

[0076] In addition, the present invention allows the upper tension spring (51) and the lower tension spring (33) to elastically restore themselves when the seismic force disappears after it occurs, thereby returning the upper slide block (43) and the lower slide block (25) to their original positions and simultaneously returning the protected equipment (F) to its original position.

Claims

1. A top plate (1) fixedly installed on the bottom surface of a protected facility (F) to be isolated from seismic force when an earthquake occurs; A bottom plate (3) fixed on the ground or a structure fixed to the ground; and includes a seismic isolation means (5) installed between the upper plate (1) and the lower plate (3) and sliding the upper plate (1), which is integrally coupled with the protected equipment (F), when the lower plate (3) moves horizontally due to seismic force during an earthquake, thereby attenuating the seismic force transmitted to the protected equipment (F). The above seismic isolation means (5) comprises a lower frame (7) fixedly installed on the lower plate (3), and An upper frame (9) installed between the upper plate (1) and the lower frame (7), A vertical sliding means (15) installed on the lower frame (7) and sliding the upper frame (9) when seismic force acting in the vertical direction of the lower plate (3) occurs, Two or more upper frame support bearings (11) are axially fixed to the lower frame (7) and support the upper frame (9), and roll by friction with the bottom surface of the upper frame (9). A horizontal sliding means (17) installed on the upper frame (9) and sliding the upper plate (1) when seismic force acting in the horizontal direction of the lower plate (3) occurs, Two or more upper plate support bearings (13) are axially fixed to the upper frame (9) and support the upper plate (1), and roll by friction with the bottom surface of the upper plate (1). and includes a restoration means (19) installed between the lower plate (3) and the upper frame (9), and between the upper frame (9) and the upper plate (1), which uses elastic restoring force to restore the arrangement state of the lower plate (3), the upper frame (9), and the upper plate (1) to the arrangement state before the seismic force was generated when the seismic force disappears. The lower frame (7) is in the shape of a rectangular prism with an open top surface and includes a pair of lower LBB shaft fixing frames (21) laid parallel to each other in the vertical direction of the lower plate (3) on the lower plate (3). A plurality of the above upper frame support bearings (11) are axially fixed to the left and right sides of the lower LBB shaft fixing frame (21), and The above-mentioned vertical sliding means (15) is installed one-to-one within a pair of lower LBB shaft fixing frames (21) and is laid vertically in the lower LBB shaft fixing frames (21), and has both ends fixedly installed on the front and rear of the lower LBB shaft fixing frames (21), and a lower LBB shaft (23). A lower slide block (25) fitted onto the lower LBB shaft (23) and fixedly coupled to the bottom surface of the upper frame (9), and includes a lower linear ball bearing (27) that is fitted onto the lower LBB shaft (23) and fixedly coupled to the lower slide block (25) to slide the lower slide block (25) in the longitudinal direction of the lower LBB shaft (23). A non-conductive seismic isolation device for over-design earthquakes, characterized by having lower low-elasticity rubber cushions (29) fitted at both ends of the lower LBB shaft (23) to cushion the impact when colliding with the lower slide block (25).

2. In Paragraph 1, The upper frame (9) is in the shape of a rectangular prism with an open top surface and is installed between the upper plate (1) and the lower frame (7), and comprises a pair of upper LBB shaft fixing frames (37) laid parallel to each other in the horizontal direction of the lower plate (3), and It includes a pair of intermediate connecting frames (39) that are laid parallel to each other in the vertical direction of the lower plate (3) between a pair of upper LBB shaft fixing frames (37) and each have their ends fixedly connected to the outer surface of a pair of upper LBB shaft fixing frames (37). A plurality of the above-mentioned upper plate support bearings (13) are axially fixed to the front and rear of the upper LBB shaft fixing frame (37), and The above horizontal sliding means (17) is installed in a 1:1 ratio within a pair of upper LBB shaft fixing frames (37) and is laid horizontally in the upper LBB shaft fixing frames (37), and the upper LBB shaft (41) has both ends fixedly installed on the left and right sides of the upper LBB shaft fixing frames (37), and Upper slide block (43) fitted onto the upper LBB shaft (41) and fixedly coupled to the top plate (1), and includes an upper linear ball bearing (45) that is fitted onto the upper LBB shaft (41) and fixedly coupled to the upper slide block (43) to slide the upper slide block (43) in the longitudinal direction of the upper LBB shaft (41), An over-design seismic isolation device for over-design seismic isolation, characterized by having upper low-elasticity rubber cushions (47) fitted at both ends of the upper LBB shaft (41) to cushion the impact when colliding with the upper slide block (43).

3. In Paragraph 2, A non-conductive seismic isolation device for an over-design earthquake, characterized in that when an overturning moment occurs because the equipment to be protected (F) exceeds the design travel distance due to an over-design earthquake, the upper slide block (43) reaches the end of the upper LBB shaft (41) or the lower slide block (25) reaches the end of the lower LBB shaft (23), the upper LBB shaft (41), the upper slide block (43), the lower LBB shaft (23), and the lower slide block (25) resist the overturning moment through their own internal strength to prevent the overturning of the equipment to be protected (F).

4. In Paragraph 1, The above-mentioned restoration means (19) includes a lower restoration means (31) connected between the lower plate (3) and the upper frame (9) that restores the arrangement between the lower plate (3) and the upper frame (9) to its original state using elastic restoring force when the seismic force acting in the vertical direction of the lower plate (3) disappears. The above lower original return means (31) comprises a pair of lower tension springs (33) positioned parallel to each other in the vertical direction of the lower frame (7) with the lower frame (7) in between, and It includes a lower tension spring fixing means (35) that fixes one end of the lower tension spring (33) to one side of the upper frame (9) and fixes the other end of the lower tension spring (33) to one side of the lower plate (3). One lower tension spring (33) positioned on the left side of the lower frame (7) is installed so that when it expands, another lower tension spring (33) positioned on the right side of the lower frame (7) contracts, and The above-mentioned restoration means (19) includes an upper restoration means (49) connected between the top plate (1) and the upper frame (9) that restores the arrangement between the top plate (1) and the upper frame (9) to its original state using elastic restoring force when the seismic force acting in the horizontal direction of the bottom plate (3) disappears. The upper original return means (49) comprises a pair of upper tension springs (51) positioned parallel to each other in the horizontal direction of the upper frame (9) with the upper frame (9) in between, and It includes an upper tension spring fixing means (53) that fixes one end of the upper tension spring (51) to one side of the upper frame (9) and fixes the other end of the upper tension spring (51) to one side of the top plate (1). A non-conductive seismic isolation device for over-design earthquakes, characterized in that when one upper tension spring (51) positioned at the front of the upper frame (9) expands, another upper tension spring (51) positioned at the rear of the upper frame (9) contracts.

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