JP2007239907A - Base isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide base isolation structure effectively preventing damage of small artifacts such as pottery, art work, or the like due to overturning, falling, or the like caused by an earthquake, and to provide a base isolation mount and a base isolation device having the structure. <P>SOLUTION: In the base isolation structure having a lower basal plate 1 and an upper mount plate 3, a middle plate 3 rotatably supported by abutting a spherical rotor 7 on the basal plate 1 positioned in a lower part and the mount plate 3 positioned in an upper part is slidably arranged in an un-fixed state between the basal plate 1 and the mount plate 3. The inexpensively manufacturable novel base isolation structure with a simple structure, and a small number of components, exercising a remarkable base isolation effect with respect to shaking due to an earthquake, particularly, shaking in a horizontal direction, and the base isolation mount and the base isolation device including the structure can be provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic isolation structure, and more particularly, for example, to be suitably applied as a seismic isolation device for preventing breakage due to an earthquake, fall, or the like of pottery, arts and crafts, etc. The present invention relates to a new seismic isolation structure having a high seismic isolation function against earthquake vibrations, in particular, horizontal shaking caused by an earthquake, and a base isolation table and a base isolation device including the structure as a component. is there.

  Conventionally, devices having various seismic isolation structures have been developed as seismic isolation devices for small figurines. As these prior arts, for example, as for a base isolation table and a base isolation device effective as a mounting table for vases, baskets, etc., the base member can be moved on the horizontal surface via rolling elements so that the object can be moved. There has been proposed a seismic isolation table characterized by installing members (Patent Document 1).

  In addition, for example, a sliding mechanism for installing important electronic equipment such as a computer or an expensive art object such as a Buddha image, a seismic isolation device, and a vibration control device were provided to be slidable on a fixed surface. A sliding mechanism having a sliding portion, in which the sliding portion and the fixed surface are relatively displaced according to the magnitude of input vibration, and adjusting the frictional force of the sliding portion with respect to the fixed surface There has been proposed a sliding mechanism, a seismic isolation device, and a seismic control device characterized in that a frictional force adjusting means is provided on the sliding portion (Patent Document 2).

  In addition, for example, as a seismic isolation device used under the equipment to protect the equipment from vibrations such as an earthquake, a pair of upper and lower base plates and an intermediate between both base plates A supporting means for allowing relative movement, and a plurality of annular wires made of a braided body fixed at least at one place on the lower base plate and at least one place on the upper base plate, respectively, and the restoring force of each wire Have been proposed to act in a direction to return the upper base plate to a predetermined position in cooperation with each other (Patent Document 3).

  In addition, for example, a seismic isolation table for absorbing shaking due to an earthquake or the like, particularly a seismic isolation table suitable for use in the protection of relatively small articles such as arts and crafts and antiques. A mounting plate, a substrate placed on an installation surface such as a floor, and an intermediate plate interposed between the mounting plate and the substrate; 3 or more are formed, and the upper surface of the substrate and the lower surface of the base plate are opposed to respective spherical concave surfaces formed on the upper and lower surfaces of the intermediate plate, and can rotate freely at the tip. A free bearing provided with a body is fixed so as to abut each of the center positions of the opposing spherical concave curved surfaces, and the base plate and the middle The horizontal direction is 360 ° with each plate kept horizontal. MenShindai, characterized in that the swingable direction is proposed (Patent Document 4).

  Further, for example, as a rack having a base isolation structure, particularly a rack having a base isolation structure for mounting an electronic device such as a computer, a plurality of lower pressure plates and a plurality of one ends attached to the lower pressure plate An elastic body, an intermediate pressure plate in which a lattice-shaped plate having a plurality of compartments is attached to the upper surface of which the other end of the elastic body is attached to the lower surface, and a plurality of spheres placed in each of the plurality of compartments; A rack having a seismic isolation structure, comprising: an upper pressure plate placed on the plurality of spheres; and a plurality of elastic members connecting the upper surface of the lower pressure plate and the lower surface of the upper pressure plate. Has been proposed (Patent Document 5).

  In addition, many prior arts related to a seismic isolation mechanism using the rotating action of a ball have been proposed (Patent Documents 6 to 11). Furthermore, as a basic configuration, there are various types of seismic isolation systems that use load bearing mechanisms such as wheels and running rails, idle rollers, ball bearings and saucers, tension coil springs, linear bearings, curved rails and bearing blocks, and viscous dampers. Has been developed. However, these seismic isolation devices have a complicated seismic isolation structure, and the devices are complex and large, have a large number of parts, are expensive, and are widespread compared to devices intended for small objects. It has not been done. For this reason, in this technical field, the device is intended for small objects, has a relatively simple structure, has a small number of parts, can be manufactured at low cost, and has high seismic isolation. There was a strong demand for the development of seismic isolation tables and seismic isolation devices using a new seismic isolation system that could be effective.

JP-A-9-370 JP-A-9-89028 Japanese Patent Laid-Open No. 9-273594 JP 2000-46105 A JP 2000-320610 A JP 2001-124139 A JP 2001-124140 A JP 2001-193792 A JP 2001-200890 A JP 2002-195346 A JP 2003-201770 A

  Under such circumstances, the present inventors, in view of the above-mentioned prior art, in particular, a new immunity that can be suitably used as a seismic isolation device for small and expensive equipment such as pottery and arts and crafts. In the process of accumulating various research on seismic methods and structures, to develop a new seismic isolation structure that is simple in structure, has a small number of parts, can be manufactured at low cost, and exhibits a high seismic isolation effect Successfully completed the present invention. The present invention efficiently absorbs vibrations caused by earthquakes, and in particular, seismic isolation structures that can be suitably used to protect small and expensive items such as ceramics and arts and crafts from shaking caused by earthquakes, It aims at providing the base isolation table and base isolation device which have a structure.

The present invention for solving the above-described problems comprises the following technical means.
(1) In a base-isolated structure having a lower substrate and an upper base plate positioned on the substrate, a plurality of spherical rotating bodies can be rotated by contacting the lower substrate and the upper base plate. A base-isolated structure characterized in that an intermediate plate supported on the base plate is slidably and non-fixedly disposed between the substrate and the base plate.
(2) The seismic isolation structure according to (1), wherein the substrate and the base plate are configured by flat plates having substantially the same shape.
(3) In the above (1), the substrate and the base plate are urged so that the base plate returns to directly above the substrate by a plurality of elastic bodies that connect the upper surface of the substrate and the lower surface of the base plate. Seismic isolation structure.
(4) The seismic isolation structure according to (3), wherein the elastic body is a coil spring or a rubber spring.
(5) The seismic isolation structure according to (1), wherein the spherical rotating body is a sphere (ball).
(6) The said intermediate plate consists of the flat plate which supported the several spherical rotary body rotatably, and is arrange | positioned so that it may be located inside the width | variety of the said board | substrate and a baseplate. Seismic isolation structure.
(7) The seismic isolation structure according to (6), wherein the middle plate has a structure in which at least four spheres are rotatably supported at four corners of the middle plate made of a flat plate.
(8) The seismic isolation structure according to (1), further including splash prevention means for preventing the upper base plate positioned on the board from splashing from the lower board due to a longitudinal seismic wave.
(9) The splash preventing means includes a lower splash preventing plate fixed to the lower substrate, an upper splash preventing plate fixed to the upper base plate, and the lower splash preventing plate positioned above the upper splash preventing plate. The seismic isolation structure according to (8), which has a structure that is installed so as to be crossed.
(10) A base isolation table or a base isolation device including the base isolation structure according to any one of (1) to (9) as a constituent element.

Next, the present invention will be described in more detail.
The present invention relates to a base-isolated structure having a lower substrate and an upper base plate positioned on the substrate, and rotating a plurality of spherical rotating bodies in contact with the lower substrate and the upper base plate. An intermediate plate supported in a slidable and non-fixed manner is disposed between the substrate and the base plate.

  According to the present invention, in the seismic isolation structure, the substrate and the base plate are constituted by flat plates having substantially the same shape, and the substrate and the base plate connect a plurality of upper surfaces of the substrate and the lower surface of the base plate. It is a preferred embodiment that the base plate is urged by the elastic body so as to return to the position immediately above the substrate.

  In the present invention, the elastic body is preferably exemplified by, for example, a coil spring and a rubber spring, but is not limited thereto, and is an expansion and contraction having an equivalent or similar elastic action. Any material can be used as well.

  In the present invention, as the spherical rotator, for example, a sphere (ball) or an appropriate rotator having a function equivalent thereto is preferably used. The material, size, number, etc. of the spherical rotator are not particularly limited and can be designed as appropriate. Usually, an arbitrary number of spherical rotators of the same material, size are arranged. The

  In the present invention, the intermediate plate is composed of a flat plate that rotatably supports a plurality of spherical rotating bodies in contact with both the upper surface of the lower substrate located below and the lower surface of the upper base plate located above. The intermediate plate is slidably and non-fixably disposed between the substrate and the base plate. Here, the term “non-fixed” means that the intermediate plate is merely placed on the substrate and is not fixed to any of the substrate and / or the base plate. In the present invention, the size of the intermediate plate is not particularly limited, but the intermediate plate is a member that slides between the upper surface of the substrate and the lower surface of the base plate and moves in the horizontal direction. Therefore, it is preferable to form the substrate and the base plate so as to have an appropriate size so as to be positioned inside the width of the base plate.

  For example, in order to stably hold the intermediate plate, the intermediate plate is preferably formed in a structure in which at least four spheres (balls) are rotatably supported by the four corner portions of the intermediate plate made of a flat plate. However, it is not limited to these. In the present invention, the number of spherical rotating bodies such as these spheres (balls) and the structure of their supporting positions can be formed in an appropriate structure as necessary. In the intermediate plate, the support structure for supporting the spherical rotating body such as a sphere (ball) can rotate while the spherical rotating body is in contact with the upper surface of the substrate located at the lower portion and the lower surface of the base plate located at the upper portion. What is necessary is just to support, and the support structure in particular is not restrict | limited.

  Furthermore, in the present invention, it is possible to construct and provide a seismic isolation table and a seismic isolation device having an appropriate shape using the seismic isolation structure. The seismic isolation structure of the present invention has an important component in that the intermediate plate is slidably and non-fixedly disposed between the substrate and the base plate. And thereby, for example, the middle plate can slide and move freely following the horizontal shaking of the lower substrate with respect to the vertical and horizontal amplitudes caused by the seismic wave. It becomes feasible to remarkably suppress horizontal movement, and in particular, it is possible to exhibit a high seismic isolation effect against horizontal shaking.

  The seismic isolation structure of the present invention is used, for example, by placing it on a shelf, an exhibition stand, a floor, etc., and if necessary, fixing it to it and placing an object on the upper base plate. When the lower substrate vibrates due to an earthquake or the like, the base plate on which the objects are placed also shakes together. However, the upper base plate located in the upper part is connected to the lower substrate located in the lower part by an elastic body such as a coil spring, and the upper base plate is composed of a sphere (ball) supported by the middle plate. Since the intermediate plate is slidably and non-fixedly disposed between the substrate and the base plate, the container and the upper base plate are integrated with the lower substrate. Without moving to, the vibration energy from the bottom is surely removed. The relative displacement between the substrate and the base plate at this time is synergistically attenuated by the deformation of the elastic body and the sliding of the intermediate plate, and the vibration energy transmitted to the upper base plate is synergistically used for these cooperative operations. Absorbed. Therefore, the vibration applied to the container is quickly attenuated, thereby preventing the container from falling or falling.

  In the present invention, as a countermeasure against vertical vibration energy, that is, the equipment placed on the upper board swings in the vertical direction due to the simultaneous movement of the lower board and the upper base plate by the vertical seismic wave. In addition, it is possible to additionally install seismic isolation means for vertical shaking. In this case, the structure is complicated and it is not necessary to install expensive seismic isolation means, the structure is simple, the assembly and installation are simple, and it is particularly preferable that the upper base plate jumps up from the lower substrate due to vertical shaking. It is preferable to additionally install a splash prevention means that can prevent this. As the splash preventing means, for example, as shown in FIGS. 10 to 12, a lower splash preventing plate 10 fixedly installed on the lower substrate 1 and an upper portion fixedly installed on the upper base plate 3. It is preferable to install a pair of splash preventing means composed of the splash preventing plate 11.

  The base isolation table composed of the lower substrate 1 and the upper base plate 3 of the present invention, for example, when the base plate 1 moves in the vertical direction due to the vertical seismic wave, the base plate 3 also moves in the vertical direction in conjunction with it. At that time, if horizontal seismic energy, that is, lateral seismic waves, acts simultaneously, a shift occurs between the movement of the base plate 3 on which the object is placed and the movement of the substrate 1. 3 is lifted from the substrate 1, thereby causing the equipment to fall or fall from the base plate 3, causing damage to the equipment. However, at this time, if there is a splash preventing means as shown in FIGS. 10 to 12, the lower splash preventing plate 10 fixed to the substrate 1 and the upper splash preventing plate fixed to the base plate 3. 11, in order to reliably prevent the base plate 3 from significantly jumping up from the substrate 1, the base plate 3 on which the equipment is placed does not jump up from the base plate 1, thereby causing the equipment to fall or the base plate 2. It is highly probable that the camera will fall off.

  In general, as an earthquake countermeasure, it is important to attenuate both horizontal and vertical vibrations caused by an earthquake. However, especially in a base-isolated base with a simple structure, it effectively absorbs horizontal vibration energy. On the other hand, for vertical seismic waves, it is particularly important to take measures to prevent the base plate 3 from splashing due to vertical shaking immediately after the earthquake. If it is possible to prevent the upper base plate 3 from greatly jumping up from the lower substrate 1 at the beginning of the earthquake, then it is possible to prevent damage to the equipment with a high probability in practice by attenuating the horizontal vibration energy. is there. In the present invention, the situation of the vibration action on the base plate 1 and the objects placed on the base plate due to the longitudinal seismic wave and the lateral seismic wave as described above is comprehensively examined, and is realistically high. The effectiveness of the above-mentioned splash preventing means capable of preventing damage to the equipment with probability was confirmed.

  In the present invention, the splash preventing means is preferably exemplified by the structure shown in FIGS. 10 to 12, but is not limited to this example, and has the same or similar structure. Any material can be used as long as it has an effect of preventing the base plate 3 from greatly jumping up from the substrate 1 against vertical shaking. Further, in the present invention, it is also possible to appropriately adopt a structure in which an elastic material such as a coil spring is additionally installed on the substrate 1 to attenuate the seismic waves in the vertical direction by the energy absorbing action of the elastic material. In the invention, the structure to which the seismic isolation means for such a longitudinal seismic wave is added, and the specific configuration thereof can be arbitrarily designed as necessary.

  The splash preventing means includes a lower splash preventing plate 10 fixed to the lower substrate 1 and an upper splash preventing plate 11 fixed to the upper base plate 3 positioned on the substrate. The lower splash preventing plate 10 and the upper splash preventing plate 11 are fixed to the lower substrate 1 and the upper base plate 3, and the fixing means 12 and 13 are, for example, screws or the like via an appropriate height adjusting member. The method of fixing using the usual fixing member of this is illustrated. In that case, the lower splash-preventing plate 10 and the upper splash-preventing plate 11 are installed so as to cross so that the lower splash-preventing plate 10 is positioned above the upper splash-preventing plate 11. It is possible to add a stopper function for preventing the upper base plate 3 from splashing up.

  Usually, the lower splash prevention plate 10 is installed on the upper side of the middle plate, and the upper splash prevention plate 11 is placed on the lower side of the middle plate, but this is not restrictive. The lower splash preventing plate 10 and the upper splash preventing plate 11 are preferably exemplified by plate materials made of wood, plastic, metal, etc., but are not limited to these materials. It is possible to use members of appropriate materials and forms having the same functions as those described above, and they can be arbitrarily designed according to the type, size, material, etc. of the base isolation table and base isolation device .

  In the present invention, in order to stably support and fix the object placed on the upper base plate, for example, using a thread fixed to fixing means provided at the four corners of the base plate, if necessary. It is possible to support and fix the container so that the container can be placed on the base plate more stably. In this case, as the fixing means, a hole having an appropriate shape capable of fixing the yarn is suitable, but the fixing means is not limited thereto, and any fixing means can be used. In addition, as the above-mentioned yarn, for example, a transparent and high-strength filamentous product is preferably used, but the yarn is not limited thereto, and a yarn of an appropriate material and form is used as long as it has a similar function. can do.

  Furthermore, the base isolation table of the present invention can be appropriately provided with other optional base isolation means as needed, whereby the vertical and horizontal directions of the base isolation table of the present invention can be appropriately set. It is possible to enhance the seismic isolation characteristics against seismic waves. The present invention has a simple structure, is easy to assemble, and is a base-isolated base composed of a minimum number of members and exhibits high base-isolation characteristics, and actually prevents damage to equipment with a high probability. The present invention has a high technical significance in that a seismic isolation structure that can be used, and a seismic isolation table and a seismic isolation device using the structure are realized.

The following effects are exhibited by the present invention.
(1) The seismic isolation structure of the present invention is highly seismically isolated, especially for horizontal shaking caused by an earthquake, due to the simultaneous cooperation of frictional force and damping force by a spherical rotating body and expansion and contraction by an elastic body. An effect is obtained.
(2) The center plate supporting the spherical rotating body is slidably and non-fixedly arranged between the substrate and the base plate, so that the center of the base plate is centered on the base plate according to the horizontal amplitude of the earthquake. It is possible to follow and slide in the horizontal direction, thereby enabling high seismic isolation against large shaking caused by an earthquake.
(3) The seismic isolation structure of the present invention can be easily assembled by simply interposing an intermediate plate supporting a spherical rotating body between the substrate and the base plate, and connecting the base plate and the base plate with an elastic body. Since it is simple, the number of parts is small, and the number of manufacturing steps is small, it has an advantage that it can be manufactured at low cost in a short time.
(4) By changing the material, strength, quantity, size, etc. of the spherical rotating body and the elastic body, it is possible to arbitrarily construct a base isolation base for small equipment to a base isolation base for large equipment.
(5) By installing the splash prevention means on the base isolation table of the present invention, it is possible to prevent the upper base plate and the objects placed on the base plate from significantly jumping up from the lower substrate due to longitudinal seismic waves. Accordingly, it is possible to prevent the object from falling over or falling from the base plate and being damaged with a high probability.
(6) Furthermore, since there is no substantial change in the seismic isolation effect due to the weight of the equipment to be placed, it is not necessary to adjust the damping force of the base isolation table.
(7) Since there are few parts and no complicated seismic isolation system and mechanism are used, no special maintenance is required.

  EXAMPLES Next, although this invention is demonstrated concretely based on an Example, this invention is not limited at all by the following Examples.

  In the following, embodiments of the present invention will be described in detail based on the description of the drawings, but the following shows one preferred embodiment of the present invention, and the present invention is applied to the following cases. It is not limited. In FIG. 1, the side view (upper stage) and the bottom view (lower stage) of the intermediate board 2 of the seismic isolation structure of this invention are shown. In the intermediate plate 2, support bases 8 that support four spherical rotating bodies (balls) 7 are fixed to the intermediate plate via fixtures 9 at the four corners of the intermediate plate made of a flat plate. The number and installation position of the support bases that support the spherical rotating body can be changed as appropriate.

  In FIG. 2, the side view of the seismic isolation structure of this invention is shown. In the figure, 1 is a lower substrate located at the bottom, 2 is a middle plate, and 3 is an upper base plate located at the top. The intermediate plate 2 is supported by a support base 8 so that a spherical rotating body 7 such as a sphere (ball) can be rotated by contacting the upper surface of the lower substrate 1 positioned below and the lower surface of the upper base plate 3 positioned above. It is supported via a fixture 9. An elastic body 4 such as a coil spring is connected to the upper surface of the substrate 1 and the lower surface of the base plate 3 via rods 5 and 6. In this case, the elastic characteristics, material, and strength of an elastic body such as a coil spring can be arbitrarily adjusted according to the weight of the base plate and the equipment placed on the base plate. Thereby, horizontal shaking is absorbed and attenuated synergistically by the cooperation of the expansion and contraction action of the elastic body and the sliding action of the intermediate plate.

  In FIG. 3, the structure which looked at the seismic isolation structure of this invention from the lower side is shown typically. In this example, four elastic bodies 4 are disposed at the four corners of the substrate 1 and the base plate, and the four corners of the middle plate 2 disposed so as to be located inside the substrate 1 and the base plate. The basic structure of the seismic isolation structure of the present invention in which the spherical rotating body 7 is supported by four support bases 8 formed in the part is shown. Furthermore, the structure (photograph) of the detail of the seismic isolation structure of this invention is shown in FIGS.

  FIG. 4 is a perspective view (photograph) of a bird's-eye view of the entire seismic isolation structure of the present invention. FIG. 5 is a side view (photograph) of a side structure (part) of the seismic isolation structure of the present invention. FIG. 6 is a bottom surface structure (photograph) of the intermediate plate, which is supported by a support base so that the spherical rotating body can rotate, as viewed from below. FIG. 7 is an enlarged view (photograph) of a support structure in which the spherical rotating body is supported by a support base. FIG. 8 is a top view (photograph) as seen from above of an intermediate plate in which the spherical rotating body is rotatably supported by a support base. FIG. 9 is a side view of a lower substrate, an upper base plate positioned on the substrate, and an intermediate plate placed thereon when the members constituting the base isolation table of the present invention are disassembled and stacked. It is a state (photograph) as seen.

  In the present invention, in particular, as a seismic isolation means for longitudinal seismic waves, a splash prevention means can be additionally installed in the base isolation table of the present invention. FIG. 10 shows an example of the splash preventing means. The splash preventing means includes a lower splash preventing plate 10 fixed to the lower substrate 1 by a fixing tool 12 and an upper portion fixed to the upper base plate (not shown) positioned on the substrate by a fixing tool 13. These are constituted by splash prevention plates 11, which are installed in a cross so that the lower splash prevention plate 10 is positioned above the upper splash prevention plate 11 in the base isolation table of the present invention. FIG. 11 shows an outline of a side view of the splash preventing means viewed from the direction B of FIG. FIG. 12 shows an outline of a side view of the splash preventing plate viewed from the direction A in FIG. Since the lower splash prevention plate 10 is installed in a cross so as to be positioned above the upper splash prevention plate 11, the substrate and the base plate are formed by the lower splash prevention plate 10 and the upper splash prevention plate 11. Thus, it becomes possible to prevent the base plate from significantly jumping up from the substrate due to vertical shaking caused by vertical seismic waves. In this case, the intermediate plate is disposed in a space close to the upper base plate or in a space close to the lower substrate.

  In the present invention, since the intermediate plate is slidably arranged between the substrate and the base plate so as to be slidable, the frictional action due to the sliding of the intermediate plate and the expansion and contraction action of the elastic body such as the coil spring are synergistic. In cooperation, it is possible to demonstrate a high seismic isolation effect especially against horizontal shaking of the earthquake. In the present invention, since the intermediate plate is slidably and non-fixedly arranged, the intermediate plate slides following the horizontal movement of the base plate to absorb the horizontal vibration energy. It can be absorbed effectively by the force and damping force and can be isolated. The present invention can effectively prevent breakage of small items such as pottery, arts and crafts, etc. due to an earthquake, falling, etc., but is not limited thereto, for example, showcases, displays, office equipment It is possible to provide a seismic isolation structure that can be suitably used as an earthquake countermeasure for all equipment represented by electrical equipment, furniture, furniture, etc., and a seismic isolation table and seismic isolation device having the structure. is there.

  As described above in detail, the present invention relates to a seismic isolation structure, and according to the present invention, the present invention exhibits a high seismic isolation function against vibration caused by an earthquake, in particular, horizontal vibration caused by an earthquake, It is possible to provide a seismic isolation structure having a new seismic isolation structure provided with a splash prevention means that reliably prevents the base plate from being lifted up due to swaying of the direction. In particular, the present invention provides a new seismic isolation table and seismic isolation device that can be suitably used as seismic isolation means that can effectively prevent breakage due to the fall, fall, etc. of small items such as pottery, arts and crafts, etc. Can be provided. INDUSTRIAL APPLICABILITY The present invention is useful for providing a new seismic isolation structure that has a simple structure, has a small number of parts, can be manufactured at low cost, and has a high seismic isolation function.

The side view (upper stage) and bottom view (lower stage) of the intermediate board which comprise the seismic isolation structure of this invention are shown. The side view of the seismic isolation structure of this invention is shown. The figure which showed typically the structure which looked at the seismic isolation structure of this invention from the lower side is shown. The perspective view (photograph) of the whole seismic isolation structure of this invention is shown. The side view (photograph) of the side structure (part) of the seismic isolation structure of this invention is shown. The bottom structure (photograph) of the middle board of the seismic isolation structure of this invention is shown. The enlarged view (photograph) of the support structure of the support stand which supports a spherical rotating body on an intermediate plate is shown. The top view (photograph) which looked at the spherical rotary body supported by the intermediate plate from the upper side of the intermediate plate is shown. The state (photograph) which looked at the board | substrate, the baseplate, and the intermediate board mounted in this baseplate from the side surface is shown. The outline of the arrangement structure of the splash preventing means composed of the lower splash preventing plate 10 fixed to the lower substrate 1 and the upper splash preventing plate 11 fixed to the upper base plate is shown. The outline | summary of the side view of the splash prevention means seen from the B direction of FIG. 10 is shown. The outline | summary of the side view of the splash prevention means seen from the A direction of FIG. 10 is shown.

Explanation of symbols

1 Substrate 2 Middle plate 3 Base plate 4 Elastic body (coil spring)
5 Rod 6 Rod 7 Spherical rotating body (ball)
8 Support Base 9 Fixing Tool 10 Lower Splash Prevention Plate 11 Upper Splash Prevention Plate 12 Fixing Tool 13 Fixing Tool

Claims (10)

  In a base-isolated structure having a lower substrate and an upper base plate positioned on the substrate, a plurality of spherical rotating bodies are rotatably supported by contacting the lower substrate and the upper base plate. A base-isolated structure characterized in that an intermediate plate is slidably arranged between the substrate and the base plate in a non-fixed manner.   The base isolation structure according to claim 1, wherein the substrate and the base plate are configured by flat plates having substantially the same shape.   The base isolation structure according to claim 1, wherein the base plate and the base plate are urged so that the base plate returns to directly above the base plate by a plurality of elastic bodies that connect the upper surface of the base plate and the lower surface of the base plate. body.   The seismic isolation structure according to claim 3, wherein the elastic body is a coil spring or a rubber spring.   The seismic isolation structure according to claim 1, wherein the spherical rotating body is a sphere (ball).   The seismic isolation structure according to claim 1, wherein the intermediate plate is composed of a flat plate that rotatably supports a plurality of spherical rotating bodies, and is disposed so as to be positioned inside the width of the substrate and the base plate. .   The seismic isolation structure according to claim 6, wherein the intermediate plate has a structure in which at least four spheres are rotatably supported by four corner portions of the intermediate plate made of a flat plate.   The seismic isolation structure according to claim 1, further comprising a splash preventing means for preventing the upper base plate positioned on the board from splashing from the lower board due to a longitudinal seismic wave.   The splash preventing means includes a lower splash preventing plate fixed to the lower substrate, an upper splash preventing plate fixed to the upper base plate, and the lower splash preventing plate positioned above the upper splash preventing plate. The seismic isolation structure according to claim 8, having a structure installed in a cross.   A base isolation table or base isolation device comprising the base isolation structure according to claim 1 as a constituent element.