JP2009103255A - Integral spring damping mechanism for base isolation vibration damping device, and base isolation vibration damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a space-saving type damping mechanism for a base isolation vibration damping device, capable of securing maintainability-adjustability, while reducing the occupying area. <P>SOLUTION: This integral spring damping mechanism has a lower stand side fixing part 11 having an extraction hole 11a erected from a lower stand 2, an upper stand side fixing part 12 having an extraction hole 12a erected downward from an upper stand 3 and arranged at a predetermined interval to the lower stand side fixing part 11, a pair of spring supports 15 and 16 having hollow parts 15a and 16a respectively rotatably installed in the horizontal direction by shaft coupling on a lower stand side fixing part 2 and an upper stand side fixing part 3, a coil-shaped spring 20 installed in the pair of spring supports 15 and 16 in a state of respectively fixing both ends of presenting a cylindrical shape, and a vibration damping damper 21 concentrically arranged in this spring 20, respectively detachably installing one end side on one spring support 15 and the other end on the other spring support 16 and extractable to the side via the hollow part 15a and the extraction hole 11a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an integrated spring damping mechanism and a seismic isolation device for a seismic isolation / damping device, and more particularly, a seismic motion / wind vibration in a precision instrument, a machine, a facility, an instrument, a medium-light weight building, a structure, and the like. The present invention relates to an integrated spring damping mechanism and a seismic isolation device for a seismic isolation device that performs seismic isolation and vibration control.

  Conventionally, in order to perform seismic isolation / damping against seismic motion and wind vibration, an orthogonal rail and an elastic body / attenuator that freely slides the movable part platform on which the seismic isolation object is placed on the XY plane are used. A seismic isolation system has been developed.

  In the technical field of such a seismic isolation device, the purpose of using a mechanism that freely slides the movable unit base on the XY plane includes space saving by suppressing the height to a low level. It has not yet been improved to maintain and adjust while reducing the flat area.

  Further, as a conventional example, there are a mechanism in which an elastic body and an attenuator are simply combined in parallel, and a mechanism in which the elastic body and the attenuator are integrated into a single unit and removed for the maintenance.

  Among these, the former mechanism has a problem in terms of space saving and requires a mounting part for each of the elastic body and the attenuator, which is disadvantageous in terms of cost. In addition, the latter mechanism can be said to be a mechanism that sacrifices maintainability although it saves space.

  Patent Document 1 is configured to exhibit a damping performance by connecting a damping damper and a coil spring that gives an axial restoring force to the damping damper in series with respect to a building frame member. A building vibration control device has been proposed.

However, in the case of this patent document 1, since the series structure of a damping damper and a coil spring is adopted, it is not necessarily sufficient in terms of space saving.
JP 2003-049557 A

  The problem to be solved by the present invention is that there is no space-saving damping mechanism for a seismic isolation device that can maintain and adjust while reducing the occupied area.

  An integrated spring damping mechanism for a seismic isolation device according to the present invention includes a lower base placed on the ground or a floor, and an upper base placed on the base of the base for vibration isolation control at the upper part of the lower base. An integrated spring damping mechanism for a seismic isolation vibration control device, which is connected and arranged between the base isolation vibration control devices for performing base isolation control of the base isolation control object, and includes a lower base side fixed component having a hole erected from the base base; An upper base side fixing part which is provided with a hole erected downward from the upper base part and is spaced from the lower base side fixing part by a predetermined distance; the lower base side fixing part and the upper base side fixing part; A pair of spring supports each having a hollow portion rotatably attached in the horizontal direction by axial coupling, and a coil-shaped spring constructed in a state where both ends of the pair of spring supports are formed in a cylindrical shape are fixed to each other. Are arranged concentrically in this spring, with one end on one spring support and the other end on the other. Each detachably attached with a support to the most important feature to have, an attenuator for damping possible sampling laterally through said hollow portion and the vent hole.

  According to the first and second aspects of the invention, it is possible to pull out only the attenuator sideways without removing the spring, and it is excellent in maintainability, and the damping force of the attenuator itself can be adjusted or replaced. In addition, both spring supports are pivotally supported by the lower base side fixing parts and the upper base side fixing parts, so that they can follow the horizontal displacement freely and are seismic isolation. It is possible to provide an integrated spring damping mechanism for a seismic isolation device having a space-saving structure in which a spring and a damper capable of exhibiting a damping action are integrated.

  According to invention of Claim 3 and 4, only each attenuator can be pulled out without removing each spring, it is excellent in maintainability, and the whole seismic isolation system is adjusted or replaced by each attenuator The damping force can be adjusted arbitrarily, and each spring and each attenuator can freely follow the displacement in the Y direction or X direction even when the upper platform is displaced in the Y direction or X direction. The seismic isolation / damping function can be effectively demonstrated as a whole, and the individual integrated spring damping mechanism has a space-saving structure. A vibration damping device can be provided.

  According to the fifth aspect of the present invention, four integrated spring damping mechanisms are arranged in the X direction arrangement between the lower frame and the upper frame and four in the Y direction, and between the lower frame and the upper frame. Four orthogonal rail devices that allow relative displacement in the X direction and Y direction of the upper frame and the lower frame are arranged at four corners between them, and the X direction is placed between the upper frame and the lower frame. With the configuration in which the drive device and the Y-direction drive device are arranged, it is possible to provide a seismic isolation device that has the same effect as the invention of claim 3 or 4.

An object of the present invention is to provide a space-saving damping mechanism for a seismic isolation device capable of ensuring maintenance and adjustment while reducing an occupied area.
The present invention achieves the above-described object between a rectangular base placed on the ground or floor and a rectangular base placed on the seismic isolation object side above the base. An integrated spring damping mechanism for a seismic isolation device that is connected and performs seismic isolation control of the seismic isolation target object, and has a horizontal base-side fixed part that stands upright from the base An upper base-side fixing component that is provided with a horizontal hole erected downward from the upper base, and that is spaced from the lower base-side fixing component by a predetermined distance, and the lower base-side fixing component and the upper A pair of spring supports each having a horizontal hollow portion in which a projecting piece is axially coupled to a bearing piece provided in an opposing arrangement to the base-side fixed component and rotatably mounted in the horizontal direction, and the pair of spring supports A coiled spring installed in a state where both ends of the body which are cylindrical are fixed, and in this spring The one end is attached to one spring support and the other end is removably attached to the other spring support using fixing parts and screws, and the hollow portion of the one spring support and the undercarriage A vibration-damping attenuator that can be pulled out horizontally through a hole provided in a side fixing part or through a hole provided in the hollow part of the other spring support and the fixing part on the upper base. Realized by the configuration.

  Hereinafter, an integrated spring damping mechanism for a seismic isolation device and a seismic isolation device according to an embodiment of the present invention will be described in detail with reference to the drawings.

(Example 1)
An integrated spring damping mechanism for a seismic isolation device according to Embodiment 1 of the present invention will be described with reference to FIGS.

  An integrated spring damping mechanism (hereinafter referred to as “integrated spring damping mechanism”) 1 for a seismic isolation device according to the first embodiment, as shown in FIG. 1, is a rectangular shape disposed on the ground or floor surface. Between the lower base 2 and the rectangular upper base 3 disposed on the side of the seismic isolation object 4 such as a precision instrument or a machine. It is connected and arranged so as to perform seismic isolation / damping with respect to the seismic motion / wind vibration of the seismic isolation target 4.

  The integrated spring damping mechanism 1 includes a substantially L-shaped lower base side fixing component 11 having a horizontal hole 11a standing upward from the lower base 2 and a downward direction from the upper base 3. And an inverted L-shaped upper base-side fixing part 12 which is provided with a horizontal hole 12a and is spaced from the lower base-side fixing part 11 by a predetermined distance.

  The lower pedestal side fixing component 11 includes a pair of upper and lower bearing pieces 13a and 13b protruding toward the upper pedestal side fixing component 12 side. Similarly, the upper pedestal side fixing component 12 is placed on the lower pedestal side fixing component 11 side. 13a and 13b are provided with a pair of upper and lower bearing pieces 14a and 14b protruding opposite to each other.

  The pair of bearing pieces 14a of the upper gantry-side fixing component 12 is replaced with one spring support 15 having a substantially cylindrical shape and having a hollow portion 15a with respect to the pair of bearing pieces 13a, 13b of the lower gantry-side fixing component 11. The other spring supports 16 having a substantially cylindrical shape with respect to 14b and having hollow portions 16a are attached so as to be rotatable in the horizontal direction.

  That is, the spring support 15 is formed in a substantially cylindrical shape, and a pair of bearing pieces 13a and 13b of the lower base side fixing part 11 and projecting pieces 17a and 17b that are equally spaced from each other on the end base side. Projected in a vertical arrangement toward the fixed component 11 side, the projecting piece 17a is overlaid on the bearing piece 13a, and the projecting piece 17b is overlaid on the bearing piece 13b, and these are axially coupled using shaft screws 19 and 19. The spring support 15 is configured to be supported by the undercarriage base fixing part 11 so as to be rotatable in the horizontal direction as shown in FIG.

  Similarly, the spring support 16 is formed in a substantially cylindrical shape, and a pair of bearing pieces 14a and 14b of the upper mount side fixing component 12 and projecting pieces 18a and 18b that are equally spaced from each other on the end surface thereof. Projected in a vertical arrangement toward the side fixed component 12, the projecting piece 18 a is overlaid on the bearing piece 14 a, and the projecting piece 18 b is overlaid on the bearing piece 14 b, and these are axially coupled using shaft screws 19 and 19. The spring support 16 is supported by the upper base side fixing component 12 so as to be rotatable in the horizontal direction as shown in FIG.

  On the opposite side of the spring support 15 from the projecting pieces 17a, 17b, a spring receiving cylinder portion 15b is provided so as to protrude from the side of the spring support 16 opposite to the projecting pieces 18a, 18b. A spring receiving cylinder portion 16b is provided so as to protrude from the spring receiving cylinder portion 15b.

  A coiled spring (pre-tension spring) 20 for seismic isolation / damping is provided between the spring receiving cylinder 15b and the spring receiving cylinder 16b.

  That is, the cylindrical ends of the spring 20 are fixed to a pair of spring fixing bodies 27 each having an annular shape and having a hollow portion 27a as shown in FIG. 4, and the pair of spring fixing bodies 27 are fixed to the spring receiving cylinder. The spring 20 is installed between the spring support 15 and the spring support 16 by mounting and fixing to the portion 15b and the spring receiving cylinder 16b.

  As shown in FIGS. 1 and 5, a damper 21 composed of, for example, an oil damper for damping vibration is concentrically disposed in the spring 20 laid between the spring support 15 and the spring support 16. The interior is also removable.

  As shown in FIG. 5, each end of the pair of L-shaped fixing parts 22, 22 is attached to the end face on the projecting piece 17 a, 17 b side of the spring support 15 using a set screw 23 so as to face each other. Further, a mounting projection piece 21a provided on one end side of the attenuator 21 is sandwiched between the other pieces of the pair of L-shaped fixing parts 22 and 22 and can be attached and detached using bolts 24, washers 25 and nuts 26. It is fixed.

  In addition, a pair of L-shaped fixing parts 22 are attached to the end surfaces of the spring support 16 on the projecting pieces 18a, 18b side using a set screw 23 in the opposite arrangement as described above. A mounting hole 21c provided on the rod 21b protruding to the other end of the attenuator 21 is sandwiched between the fixed parts 22 and fixed using a bolt 24, a washer 25, and a nut 26. .

  By releasing the screwed connection between the bolts 24 and the nuts 26 by the mounting structure of the damper 21 to the spring support 15 and the spring support 16, the spring support 15 of the damper 21, The connection to the spring support 16 is released.

  Thus, the attenuator 21 can be removed from the hollow portion 27a of the spring fixing body 27, the hollow portion 15a of the spring support body 15 and the lower frame side without removing the spring 20 from the spring support body 15 and spring support body 16. It can be moved, for example, in the direction of arrow a shown in FIG.

  On the contrary, the attenuator 21 is moved in the direction of the arrow b shown in FIG. 5 within the spring 20 and arranged at a predetermined position between the spring support 15 and the spring support 16. It can be attached to the support 16.

  The case where the attenuator 21 is pulled out to the side of the spring support 16 and the case where the attenuator 21 is attached to the spring support 15 and the spring support 16 are the same as described above.

  That is, according to the integrated spring damping mechanism 1 of the first embodiment, since only the attenuator 21 can be pulled out without removing the spring 20, it is excellent in maintainability, and by adjusting or replacing the attenuator 21 The damping force of the attenuator 21 itself can be adjusted arbitrarily.

  Further, according to the integrated spring damping mechanism 1 of the first embodiment described above, the spring support 15 and the spring support 16 to which the spring 20 and the attenuator 21 are attached are respectively mounted on the lower base as shown in FIG. Since the side fixing part 11 and the upper base side fixing part 12 are rotatably supported, even when the upper base side fixing part 12 is displaced, for example, in the horizontal direction and in the Y direction, these springs 20 are damped. The device 21 can freely follow the displacement in the Y direction to exhibit seismic isolation and vibration control.

  Furthermore, according to the integrated spring damping mechanism 1 of the first embodiment described above, the spring fixing body 27 has a hollow portion 27a, the spring support 15 has a hollow portion 15a, and the undercarriage side fixing component 11 has a hole 11a. It is provided to secure an accommodation space for the attenuator 21, and the attenuator 21 is accommodated in the spring 20 in a concentric arrangement, so that the spring 20 and the attenuator 21 are integrated into a space-saving structure. Can do.

  Furthermore, according to the integrated spring damping mechanism 1 of the first embodiment, since the force point of the spring 20 and the force point of the attenuator 21 coincide with each other, ideal spring force and damping force can be exhibited. There is also an advantage that can be.

(Example 2)
Next, a seismic isolation device 31 according to Embodiment 2 of the present invention will be described with reference to FIG.

  As shown in FIG. 7, the seismic isolation device 31 according to the second embodiment is opposed to a rectangular lower base 2 disposed on the ground or floor and an upper portion spaced from the lower base 2 by a predetermined distance. For example, a plurality of the integrated spring damping mechanisms 1 and the like are connected to a rectangular base 3 arranged on the side of a seismic isolation object such as a precision instrument or a machine, and the seismic isolation control It performs seismic isolation and vibration control for the ground motion and wind vibration of the target object.

  That is, in the seismic isolation device 31 according to the second embodiment, a total of eight integrated spring damping mechanisms 1 are distributed between the lower base 2 and the upper base 3, and the upper base 3 A total of four orthogonal rail devices 32 that enable relative displacement in the X direction and the Y direction with respect to the gantry 2 are distributed.

The integrated spring damping mechanism 1 is arranged in series between the lower gantry 2 and the upper gantry 3 in a series of two in the X direction, and a total of four over two rows at regular intervals. Yes.
Further, with respect to the Y direction, a total of four integrated spring damping mechanisms 1 are arranged in series and in two rows at regular intervals.

  In this way, a total of eight integrated spring damping mechanisms 1 are arranged to partition the four corner regions so that each of them has a rectangular shape when the seismic isolation device 31 is viewed from above.

  A total of four orthogonal rail devices 32 are arranged at each of the four corners of the seismic isolation device 31. Further, the X direction driving device 32A and the Y direction driving device 32B are arranged between the lower frame 2 and the upper frame 3.

The orthogonal rail device 32 includes a Y-direction rail 33 arranged on the lower frame 2 side, an X-direction rail 34 arranged on the upper frame 3 side, and the Y-direction rail 33 and the X-direction rail 34 arranged in an X-Y crossing manner. And a cross support 35 for supporting relative displacement in the X and Y directions.
The X-direction drive device 32A includes an AC servo motor 41 arranged in the X direction, a coupling 42, a ball screw 43, a linear guide 44 arranged in the Y direction, and an end support 45.
The Y-direction drive device 32B includes an AC servo motor 41 arranged in the Y direction, a coupling 42, a ball screw 43, a linear guide 44 arranged in the X direction, and an end support 45.

  According to the seismic isolation device 31 according to the second embodiment, a total of eight integrated spring damping mechanisms 1 described in the first embodiment, four in the X direction between the upper mount 3 and the lower mount 2, Since the four arrangements are provided in the X direction, it is possible to pull out only the attenuators 21 without removing the springs 20 for each of the integrated spring damping mechanisms 1. By adjusting or exchanging, the damping force of the seismic isolation device 31 as a whole can be arbitrarily adjusted.

  Further, for each of the integrated spring damping mechanisms 1, the spring support 15 and the spring support 16 to which the spring 20 and the attenuator 21 are attached, as shown in FIG. Since the upper base 3 is rotatably supported by the upper base 12, the springs 20 and the attenuators 21 are connected even when the upper base 3 is displaced horizontally, for example, in the Y direction or the X direction. By freely following the displacement in the Y direction or the X direction, the seismic isolation device 31 as a whole can effectively exhibit the seismic isolation / damping action.

  Further, each of the integrated spring damping mechanisms 1 is provided with a hollow portion 27a in the spring fixing body 27, a hollow portion 15a in the spring support body 15, and a hole 11a in the mounting base side fixing component 11, respectively. Since the accommodation space is secured and the attenuators 21 are accommodated in the springs 20 in a concentric arrangement, the individual integrated spring damping mechanisms 1 have a space-saving structure, and as a result, the seismic isolation device 31 as a whole. Can also be a space-saving structure.

  Furthermore, since each of the integrated spring damping mechanisms 1 has a structure in which the force point of the spring 20 and the force point of the attenuator 21 coincide with each other, the ideal spring force and damping force of the seismic isolation device 31 as a whole. There is also an advantage that can be exhibited.

  The configuration of the seismic isolation device 31 shown in FIG. 7 is merely an example, and it goes without saying that the number of arrangements of the integrated spring damping mechanism 1 and the number of arrangements of the orthogonal rail devices 32 are not limited to the illustrated examples.

  The integrated spring damping mechanism for seismic isolation devices of the present invention exerts seismic isolation / damping action against seismic and wind vibrations in precision equipment, machinery, equipment, equipment, as well as medium and lightweight buildings and structures. Widely applicable as a space-saving mechanism.

It is a schematic front view which shows the integral spring damping mechanism for seismic isolation devices which concern on Example 1 of this invention. It is explanatory drawing which shows the plane of the state which extracted the attenuator of the integrated spring damping mechanism for seismic isolation devices which concern on the present Example 1, and the side surface of a mounting base side fixing component. FIG. It is a front view of the state which extracted the attenuator of the integrated spring damping mechanism for seismic isolation devices concerning this Example 1. It is explanatory drawing which shows the spring and spring fixed body of the integrated spring damping mechanism for seismic isolation devices which concern on the present Example 1. FIG. It is the schematic which shows the state which extracts the attenuator from the mounting base side fixing | fixed part to the side in the integrated spring damping mechanism for seismic isolation devices which concern on the present Example 1. FIG. It is explanatory drawing which shows the rotation state of a spring and an attenuator in the integrated spring damping mechanism for seismic isolation devices concerning Example 1 of this invention. It is a schematic plan view which shows the seismic isolation system which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damping mechanism for seismic isolation system 2 Lower base 3 Upper base 4 Seismic isolation object 11 Lower base side fixed part 11a Hole 12 Upper base side fixed part 12a Hole 13a Bearing piece 13b Bearing piece 14a Bearing piece 14b Bearing piece DESCRIPTION OF SYMBOLS 15 Spring support body 15a Hollow part 15b Spring receiving cylinder part 16 Spring support body 16a Hollow part 16b Spring receiving cylinder part 17a Projection piece 17b Projection piece 18a Projection piece 18b Projection piece 19 Shaft screw 20 Spring 21 Attenuator 21a Installation projection piece 21b Rod 21c Mounting hole 22 Fixing part 23 Set screw 24 Bolt 25 Washer 26 Nut 27 Spring fixing body 27a Hollow part 31 Seismic isolation device 32 Orthogonal rail device 32A X direction drive device 32B Y direction drive device 33 Y direction rail 34 X direction rail 35 Cross support 41 AC servo motor 42 Coupling 43 Baud Screw 44 linear guide 45 end support

Claims (5)

A seismic isolation object is connected between a lower base placed on the ground or floor and an upper base placed on the base of the base isolation object at the top of the base. An integrated spring damping mechanism for a seismic isolation damping device that performs damping,
A mounting base side fixing part having a hole erected from the mounting base;
An upper base side fixing part arranged with a predetermined interval with respect to the lower base side fixing part, provided with a hole erected downward from the upper base;
A pair of spring supports each having a hollow portion attached to the lower base side fixing part and the upper base side fixing part so as to be pivotable in the horizontal direction by axial coupling;
A coiled spring constructed in a state of fixing both ends of a cylindrical shape to the pair of spring supports,
A vibration that is concentrically arranged in the spring and is detachably attached at one end to one spring support and the other end to the other spring support, and can be pulled out laterally through the hollow portion and the hole. An attenuator for attenuation,
An integrated spring damping mechanism for a seismic isolation vibration device. It is connected and arranged between a rectangular base placed on the ground or floor and a rectangular base placed on the side of the seismic isolation object at the upper part of the base. An integrated spring damping mechanism for a seismic isolation device that performs seismic isolation of a vibration object,
A mounting base side fixing component having a horizontal hole erected from the mounting base;
An upper base side fixing component arranged horizontally spaced from the upper base with a predetermined hole with respect to the lower base side fixing component;
A pair of bearings provided on the lower base side fixing part and the upper base side fixing part opposite to each other are provided with a horizontal hollow portion that is rotatably coupled in the horizontal direction by axially coupling the projecting pieces. A spring support;
A coiled spring constructed in a state of fixing both ends of a cylindrical shape to the pair of spring supports,
It is concentrically arranged in the spring, and one end side is attached to one spring support body and the other end is detachably attached to the other spring support body by using fixing parts and screws, and the one spring support body is hollow. For vibration damping, which can be pulled out horizontally through a hole provided in the lower part and the lower base side fixing part, or through a hole provided in the hollow part of the other spring support and the upper base side fixing part. An attenuator,
An integrated spring damping mechanism for a seismic isolation vibration device. A seismic isolation control of the seismic isolation control object is arranged between a lower base placed on the ground or floor and an upper base placed on the base of the base isolation control object at the upper part of the base base. A seismic isolation device for shaking,
A lower base side fixing component having a hole standing upright from the lower base, and an upper base side arranged at a predetermined interval with respect to the lower base side fixing component having a punching hole standing downward from the upper base A pair of spring supports each including a fixed part, a hollow portion attached to the lower base side fixed part and the upper base side fixed part so as to be pivotable in a horizontal direction by axial coupling, and a cylinder on the pair of spring supports Coiled springs installed in a state where both ends are fixed, and concentrically arranged in the spring, so that one end side can be attached to one spring support and the other end can be attached to the other spring support. An integrated spring damping mechanism having a vibration damping attenuator that can be pulled out laterally through the hollow portion and the through hole in the X direction and the Y direction between the lower frame and the upper frame. A plurality of each is arranged,
A plurality of orthogonal rail devices that enable relative displacement in the X direction and the Y direction between the upper frame and the lower frame between the lower frame and the upper frame;
Seismic isolation system characterized by Between the rectangular base placed on the ground or floor and the rectangular base placed on the side of the base isolation object at the top of the base; A seismic isolation device that performs seismic isolation of an object,
A lower base side fixing part provided with a horizontal hole erected from the lower base and a horizontal hole provided downward from the upper base and provided with a predetermined distance from the lower base side fixing part A horizontal direction in which a protruding piece is axially coupled to a bearing piece provided in an opposing arrangement to the upper base side fixing part and the lower base side fixing part and the upper base side fixing part, respectively, and is mounted so as to be rotatable in the horizontal direction. A pair of spring supports having a hollow portion, a coiled spring constructed in a state where both ends of the pair of spring supports are fixed to each other, and concentrically arranged in the spring, with one end side The other end of the spring support is detachably attached to the other spring support using a fixing part and a screw, and a hole is provided in the hollow part of the one spring support and the fixing part on the lower base. Or of the other spring support An integral spring damping mechanism having a vibration attenuator that can be pulled out in the horizontal direction through a hollow portion and a hole provided in the fixed part on the upper base side, between the lower base and the upper base. A plurality of each are arranged in the X direction and the Y direction,
A plurality of orthogonal rail devices that enable relative displacement in the X direction and the Y direction between the upper frame and the lower frame between the lower frame and the upper frame;
Seismic isolation system characterized by Between the rectangular base placed on the ground or floor and the rectangular base placed on the side of the base isolation object at the top of the base; A seismic isolation device that performs seismic isolation of an object,
A lower base side fixing part provided with a horizontal hole erected from the lower base and a horizontal hole provided downward from the upper base and provided with a predetermined distance from the lower base side fixing part A horizontal direction in which a protruding piece is axially coupled to a bearing piece provided in an opposing arrangement to the upper base side fixing part and the lower base side fixing part and the upper base side fixing part, respectively, and is mounted so as to be rotatable in the horizontal direction. A pair of spring supports having a hollow portion, a coiled spring constructed in a state where both ends of the pair of spring supports are fixed to each other, and concentrically arranged in the spring, with one end side The other end of the spring support is detachably attached to the other spring support using a fixing part and a screw, and a hole is provided in the hollow part of the one spring support and the fixing part on the lower base. Or of the other spring support An integral spring damping mechanism having a vibration attenuator that can be pulled out in the horizontal direction through a hollow portion and a hole provided in the fixed part on the upper base side, between the lower base and the upper base. 4 in the X direction and 4 in the Y direction,
A total of four orthogonal rail devices capable of relative displacement in the X and Y directions between the upper frame and the lower frame are arranged at four corners between the lower frame and the upper frame, An X-direction drive device and a Y-direction drive device are arranged between the lower base and
Seismic isolation system characterized by

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