JP2009264429A - Seismic isolation system and seismic isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic isolation system having restoration characteristics, which reduces an acceleration by extending the natural period of upper structure regardless of a supported load, and exhibits excellent vibration energy absorbing capability by obtaining a suitable friction force properly. <P>SOLUTION: The seismic isolation system 1 comprises: an upper shoe 11 secured to the upper structure 3 of a building having a concave lower surface 11a opening downward; a lower shoe 12 secured to the lower structure 2 such as the foundation and having a concave upper surface 12a opening upward; and moving bodies 13, 14 arranged movably between the upper shoe 11 and the lower shoe 12. The moving bodies 13, 14 have: a convex upper surface 13a facing the concave lower surface 11a of the upper shoe 11; and a convex lower surface 14a facing the concave upper surface 12a of the lower shoe 12, wherein a plurality of air outlets 13e, 14e are provided in the convex upper surface 13a and the convex lower surface 14a. At least three seismic isolation systems 1 are arranged in a seismic isolation structure 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic isolation device for a lightweight structure such as a detached house or equipment, an exhibition stand, and a seismic isolation structure provided with the seismic isolation device, in particular, an upper structure such as a building, It is interposed between the lower structure such as the foundation, reduces the transmission of vibrations of the lower structure due to earthquakes, traffic vibrations, etc. to the upper structure, collapses the upper structure, or is mounted on the upper structure. The present invention relates to a seismic isolation device that prevents damage to exhibits placed.

  As a seismic isolation device that is interposed between an upper structure such as a building and a lower structure such as a foundation and reduces the shaking of the upper structure, for example, the one described in Patent Document 1 is known. Yes. The seismic isolation device is fixed to the upper structure, and has an upper gutter having a concave spherical lower surface that opens downward, and a lower gutter that is fixed to the lower structure and has a concave spherical upper surface that opens upward, A sliding body is slidably disposed between the upper collar and the lower collar and has a convex spherical upper surface and a convex spherical lower surface.

  In the seismic isolation device of Patent Document 1 described above, when horizontal vibration (displacement) occurs in the lower structure due to the earthquake, the horizontal vibration of the lower structure is transmitted to the upper structure as it is by sliding the sliding body. Therefore, it is possible to reduce the shaking of the upper structure. In this seismic isolation device, regardless of the load supported by the seismic isolation device, the natural period of the upper structure can be lengthened from the principle of the pendulum. It is possible to obtain a damping action of vibration energy by the frictional resistance generated on the contact surface.

  Further, as a seismic isolation device that floats the upper structure by gas pressure, Patent Document 2 has a skirt-like seal member attached to the lower surface of the upper structure, and its tip is suspended in a groove provided in the lower structure. By sealing the lower space of the upper structure and introducing the levitation gas into the sealed space to lift the upper structure, thereby preventing the seismic motion from being transmitted to the upper structure. An apparatus is described. Further, as a seismic isolation device of this type, Patent Document 3 discloses a storage table on which an exhibit is placed on a storage box in which an air supply device is stored. In the meantime, an air pad provided with a plurality of air blowing holes in a square shape is arranged, and air is blown out from the air blowing holes to lift the mounting table, so that the mounting table vibrates when an earthquake occurs. A seismic isolation device that prevents this is described.

Utility Model Registration No. 2586794 Japanese Unexamined Patent Publication No. 2000-14585 JP 2001-208131 A

  However, in the seismic isolation device described in Patent Document 1, the friction coefficient of the sliding surface is uniquely determined by the sliding body, the material of the upper structure and the lower structure, and the load to be supported. There was a problem that the adjustment range was narrow. For this reason, when a low frictional force or a high frictional force is required, the material of the sliding surface must be changed, and the change of the sliding surface material may occur at the start of sliding. Sufficient consideration must be given to the generation of excessive resistance due to the coefficient of static friction, and it has been difficult to select materials.

  On the other hand, in the seismic isolation devices described in Patent Documents 2 and 3, a great effect can be expected in terms of blocking the vibration of the earthquake, but in order to use air pressure effectively, precise sealing technology is required, Since the friction is zero when the structure rises, the position of the upper structure will not be stable and the shaking of the earthquake will be settled unless the construction accuracy with the lower structure is very strict. A device for returning the origin of the subsequent upper structure is also necessary, which causes a problem that the cost is increased due to a large facility. Furthermore, the seismic isolation devices described in Patent Documents 2 and 3 also have a drawback that the seismic isolation mechanism itself does not operate at all when a failure occurs in the air supply device or when it is stopped due to a power failure or the like.

  Therefore, the present invention has been made in view of the above points, and regardless of the load to be supported, the natural period of the upper structure can be prolonged to reduce the acceleration, and a suitable frictional force can be obtained as appropriate. The purpose of the present invention is to provide a seismic isolation device that has excellent vibration energy absorption capability and also has restoration characteristics.

  In order to achieve the above object, the present invention provides a seismic isolation device, which is fixed to an upper structure and has an upper gutter having a concave spherical lower surface that opens downward, and is fixed to the lower structure and opens upward. And a movable body disposed movably between the upper collar and the lower collar, and the movable body is disposed on the concave spherical lower surface of the upper collar. The convex spherical upper surface is opposed to the concave spherical upper surface of the lower shell, and the air blowing groove is formed on the convex spherical upper surface and / or the convex spherical lower surface. It is characterized by providing.

  According to the present invention, when the lower structure horizontally oscillates (displaces) during an earthquake or the like, the moving body applies a load between the concave spherical lower surface of the upper collar and the concave spherical upper surface of the lower collar. While supporting, it moves along the concave spherical lower surface of the upper collar and the concave spherical upper surface of the lower collar, so that the horizontal vibration of the lower structure can be prevented from being transmitted to the upper structure as it is, and the Regardless of the load supported by the seismic device, the natural period of the upper structure can be lengthened from the principle of the pendulum, and the acceleration to the upper structure can be reduced.

  In addition, according to the present invention, air is blown out from the air blowing groove to form an air layer on the surface of the moving body, or to reduce the load on the upper structure supported by the seismic isolation device by air pressure. The moving body can be moved in a state where no force is generated or in a state where the frictional force is small. On the other hand, by stopping the air blowing from the air blowing groove and bringing the moving body into contact with the concave spherical lower surface of the upper collar and the concave spherical upper surface of the lower collar, The moving body can be slid by the frictional force determined by the load material and the load to be supported. Therefore, the frictional force can be changed without changing the material such as the moving body, and a suitable frictional force can be obtained as appropriate to ensure excellent vibration energy absorption capability.

  Furthermore, according to the present invention, after an earthquake or the like has subsided, the moving body that has been moved by receiving an external force is reversed along the inclination of the concave spherical lower surface of the upper collar and the concave spherical upper surface of the lower collar. Since it moves gently in the direction and finally returns to the center, it is possible to return the moving body to the home position without providing a separate home position return device, and to ensure restoration characteristics.

  The present invention is also a seismic isolation device, which is fixed to the lower structure and has a concave spherical upper surface that opens upward, and is fixed to the upper structure and disposed on the lower structure. The movable body has a convex spherical lower surface facing the concave spherical upper surface of the lower collar, and an air blowing groove on the convex spherical lower surface. . According to the present invention, it is possible to reduce the acceleration by prolonging the natural period of the upper structure regardless of the load to be supported with a simpler configuration, and in a similar manner to the above-described invention. By obtaining the above, it is possible to have excellent vibration energy absorption capability and also have a restoring characteristic.

  Further, the present invention is a seismic isolation device, which is fixed to the upper structure and has an upper lower surface having a concave spherical lower surface that opens downward, and is fixed to the lower structure and is disposed under the upper surface. The movable body has a convex spherical upper surface facing the concave spherical lower surface of the upper collar, and an air blowing groove on the convex spherical upper surface. . According to the present invention, it is possible to reduce the acceleration by prolonging the natural period of the upper structure regardless of the load to be supported with a simpler configuration, and in a similar manner to the above-described invention. By obtaining the above, it is possible to have excellent vibration energy absorption capability and also have a restoring characteristic.

  The seismic isolation device includes air supply means for supplying air to the moving body, and the air supply means is a magnitude of an external force applied to the lower structure or a magnitude of vibration transmitted to the upper structure. Accordingly, the air supply to the moving body can be controlled. According to this configuration, a frictional force suitable for the magnitude of the external force can be obtained as appropriate, and an excellent vibration energy absorption capability can be ensured.

  In the seismic isolation device, the air supply means supplies air to the moving body when the magnitude of external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure is less than a predetermined value. When the magnitude of external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure is equal to or greater than a predetermined value, the supply of air to the moving body is stopped, Or it can comprise so that air may be attracted | sucked from the said mobile body.

  According to the above configuration, when the vibration is relatively small and the magnitude of the external force applied to the lower structure or the magnitude of the vibration transmitted to the upper structure is less than a predetermined value, the surface of the moving body In order to reduce the load on the upper structure supported by the seismic isolation device by air pressure, it is possible to slide in a state where no friction force is generated or in a state where the friction force is small, and acceleration due to a longer period A suitable seismic isolation effect can be obtained by the reduction. On the other hand, the vibration is relatively large, and the magnitude of the external force applied to the lower structure or the magnitude of the vibration transmitted to the upper structure is a predetermined value or more. In this case, in addition to reducing the acceleration by increasing the period, damping is given by the frictional force determined by the material such as the sliding body and the load to be supported, so the ability to absorb vibration energy can be improved. Safety in case of an earthquake It is possible to secure the sex. Also, by sucking air from the moving body, the vibration energy can be attenuated by using the adsorption force in addition to the frictional force determined by the material such as the moving body and the load to be supported. It becomes possible to gain ability. For this reason, it is possible to obtain at least three stages of seismic isolation characteristics with a single seismic isolation device by properly using air supply, supply stop, and air suction, for example. In addition, as the magnitude of the external force as the predetermined value, acceleration, speed, or displacement can be used as appropriate.

  In the seismic isolation device, the air supply means applies the force to the moving body when the magnitude of an external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure is less than a predetermined value. When supply of air is stopped or air is sucked from the moving body, and the magnitude of external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure is greater than or equal to a predetermined value The mobile body can be configured to supply air.

  According to the above configuration, in a relatively small vibration region less than a predetermined value, it corresponds to the magnitude of the friction force determined by the friction force determined by the material such as the moving body and the load to be supported or the suction force by air suction. Until the external force is input, the upper structure can be secured immovably, while the vibration is large and the magnitude of the external force applied to the lower structure or the magnitude of the vibration transmitted to the upper structure is predetermined. When the value is equal to or larger than the value, the displacement can be absorbed while the resistance force is small while the natural period of the upper structure is lengthened, so that it can be used as a trigger device.

  In the seismic isolation device, the convex spherical upper surface has the same curvature as the concave spherical lower surface, and the convex spherical lower surface has the same curvature as the concave spherical upper surface. Can be configured. According to this configuration, the movable body can be floated or brought into surface contact with the upper rod and the lower rod at a certain distance, and the upper structure can be supported more stably.

  In the seismic isolation device, the air blowing groove of the moving body can be formed by a surface restriction, and a self-drawing-shaped air blowing hole can be formed in the bottom surface of the air blowing groove without requiring precision machining. A seismic isolation device capable of mass production can be realized.

  Further, the seismic isolation device may include a plurality of combinations of the air blowing groove formed by the surface restriction and the air blowing hole having the self-formed restriction shape, and each combination can be made independent of each other. Thus, air can be blown out uniformly over the entire convex spherical upper surface or convex spherical lower surface of the moving body.

  Furthermore, the air blowing groove of the moving body can be used also as an air suction groove when sucking air from the moving body, thereby contributing to a reduction in manufacturing cost of the seismic isolation device. An air suction groove may be provided separately from the air blowing groove.

  In the seismic isolation device, at least one of the upper and lower surfaces of the movable body is a polyphenylene sulfide resin, or a reinforced synthetic resin in which at least one of glass fiber, carbon fiber, or inorganic filler is mixed in the polyphenylene sulfide resin. Can be formed. Since this polyphenylene sulfide resin or the like has excellent sliding characteristics, it is possible to achieve both stable load support and sliding characteristics. In addition, for example, even if some trouble occurs in the air supply device, good sliding characteristics can be ensured, so that an excessive load can be prevented from acting on the upper structure, and a fail-safe function is also provided. It becomes possible. The moving body may be made of a copper-based or iron-based metal material, and a lubricating film having good sliding characteristics, such as molybdenum disulfide or DLC, is applied to the upper and lower surfaces of the moving body formed from the metal material. May be.

  Moreover, this invention is a seismic isolation structure, Comprising: At least 3 or more of said seismic isolation apparatuses are arrange | positioned, It is characterized by the above-mentioned. ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to prevent suitably the collapse of an upper structure, or the damage of the display etc. which are mounted on this upper structure.

  As described above, according to the present invention, regardless of the load to be supported, the natural period of the upper structure can be extended to reduce the acceleration, and the vibration energy absorption capability can be obtained by appropriately obtaining a suitable frictional force. It is possible to provide a seismic isolation device and the like that have excellent restoration characteristics.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a first embodiment of a seismic isolation device according to the present invention. This seismic isolation device 1 has a lower structure 2 such as a foundation of a detached house and a horizontal direction H with respect to the lower structure 2. It is interposed between the upper structures 3 such as detached houses.

  The seismic isolation device 1 has an upper collar 11 having a concave spherical lower surface 11a that is fixed to the upper structure 3 and opens downward, and a concave spherical upper surface 12a that is fixed to the lower structure 2 and opens upward. And a movable body 13, 14 that is movably disposed between the upper collar 11 and the lower collar 12. The upper rod 11 is fixed to the upper structure 3 by bolts 17 and 18, and the lower rod 12 is fixed to the lower structure 2 by bolts 19 and 20.

  The moving body 13 has a convex spherical upper surface 13a having the same curvature as the concave spherical lower surface 11a facing the concave spherical lower surface 11a of the upper collar 11, and a plurality of air on the convex spherical upper surface 13a. And an outlet 13e. On the other hand, the movable body 14 has a convex spherical lower surface 14a having the same curvature as the concave spherical upper surface 12a and a convex spherical lower surface 14a. Air outlet 14e. These moving bodies 13 and 14 are joined by bolts 21 and 22 and nuts 23 and 24.

  As shown in FIGS. 1 and 2, the moving body 13 is formed in a generally thick disc shape as a whole, and is connected to a flexible hose 25 via a connection fitting 26. An annular groove 13c communicating with the opening 13b and an air blowing hole 13d for guiding air from the annular groove 13c to the air blowing groove 13e are provided. The air blowing groove 13e is formed shallowly at a depth of about 0.03 mm to 0.05 mm by a so-called surface restriction. Further, the air blowing hole 13d has a so-called self-contained throttle shape and is formed with a smaller diameter toward the surface, and an air blowing outlet 13f opens at the bottom surface of the air blowing groove 13e. A closing member 15 is joined to the bottom surface of the moving body 13.

  Three combinations of the air blowing groove 13e by the surface throttle and the self-blowing shaped air blowing hole 13d are provided, each having a fan shape when viewed from above. Since these three sets of air blowing structures are independent of each other, air can be blown evenly over the entire convex spherical upper surface 13a of the moving body 13.

  On the other hand, the moving body 14 is also formed symmetrically with the joint surface with the moving body 13 as a symmetry plane, and has the same configuration as the moving body 13.

  The upper and lower surfaces or the whole of the moving bodies 13 and 14 are formed of a polyphenylene sulfide resin or a reinforced synthetic resin obtained by mixing at least one of glass fiber, carbon fiber, or inorganic filler in the polyphenylene sulfide resin. The moving body may be made of a copper-based or iron-based metal material, and a lubricating film having good sliding characteristics, such as molybdenum disulfide or DLC, is applied to the upper and lower surfaces of the moving body formed from the metal material. May be.

  As shown in FIG. 1, an air pump 27 is provided to supply air to the moving body 13, and air is introduced into the moving body 13 via the flexible hose 25 and the connection fitting 26. The air pump 27 also functions as a vacuum pump that sucks air from the moving body 13 via the connection fitting 26 and the flexible hose 25. Similarly, air is supplied or sucked by the air pump 30, the flexible hose 28, and the connection fitting 29 for the moving body 14.

  Next, operation | movement of the seismic isolation apparatus 1 which has the said structure is demonstrated, referring FIGS. 1-3. Hereinafter, the operation of the moving body 13 will be mainly described, but the moving body 14 operates in the same manner as the moving body 13.

  FIG. 3 is a history curve showing the relationship between the horizontal resistance of the seismic isolation device 1 and the horizontal displacement (relative displacement between the upper structure 3 and the lower structure 2). (B) shows a case where air is not supplied to the moving body 13 and air is not sucked from the moving body 13, and (c) shows a case where air is sucked from the moving body 13. When air is supplied to the moving body 13 in (a), the moving body 13 can be moved in a state where no frictional force is generated, so that relative displacement occurs in a state where the horizontal resistance force is small. When air is not supplied to the moving body 13 and air is not sucked from the moving body 13, air does not intervene between the moving body 13 and the upper rod 11. When a large horizontal resistance force is obtained and air is sucked from the moving body 13 in (c), an additional attracting force acts between the moving body 13 and the upper rod 11, so when the same relative displacement occurs. Can obtain a greater horizontal resistance.

  In the following description, first, in the seismic isolation device 1, when the magnitude of the external force applied to the lower structure 2 or the magnitude of vibration transmitted to the upper structure 3 is less than a predetermined value, the seismic isolation device 1 moves from the air pump 27. When air is supplied to the body 13 and the magnitude of the external force applied to the lower structure 2 or the magnitude of vibration transmitted to the upper structure 3 is greater than or equal to a predetermined value, the operation of the air pump 27 is stopped, The operation | movement which stops supply of the air to the mobile body 13 is demonstrated. By this operation, when the vibration is relatively small and the applied external force is smaller than the predetermined value, the seismic isolation device 1 operates with a low horizontal resistance force, and a suitable seismic isolation effect is obtained by reducing acceleration by increasing the period. On the other hand, if the vibration is large and the external force is greater than the predetermined value, in addition to reducing the acceleration by increasing the period, the vibration energy is attenuated by the friction force determined by the material such as the moving body and the load to be supported. As a result, it is possible to improve the absorption capacity and secure safety in the event of a large earthquake.

  Normally, air is supplied from the air pump 27 to the moving body 13 via the flexible hose 25 and the connection fitting 26. The air supplied from the connection fitting 26 to the moving body 13 is blown out from the air supply port 13b to the concave spherical lower surface 11a through the annular groove 13c and the air blowing hole 13d. As a result, an air layer is formed between the convex spherical upper surface 13a of the movable body 13 and the concave spherical lower surface 11a of the upper collar 11, so that a frictional force is generated as shown in FIG. In other words, the mobile body 13 can be moved, in other words, the seismic isolation device 1 operates with a small horizontal resistance force, and a suitable seismic isolation effect can be obtained by reducing the acceleration by increasing the period. This state is continuously maintained when the magnitude of the external force applied to the lower structure 2 is less than a predetermined value.

  On the other hand, in the event of a large earthquake or the like where an external force exceeding a predetermined value is applied, the operation of the air pump 27 is stopped and the supply of air to the moving body 13 is stopped. Thereby, the convex spherical upper surface 13a of the movable body 13 and the concave spherical lower surface 11a of the upper collar 11 are in direct contact with each other, and the movable body 13 slides. As a result, as shown in FIG. 3 (b), in addition to the reduction of acceleration due to the longer period, damping is performed by the frictional force determined by the material such as the moving body 13 and the load to be supported, and the absorption of vibration energy is increased. It is possible to improve and secure safety.

  In the above embodiment, the operation of the air pump 27 is stopped when the magnitude of the external force applied to the lower structure 2 or the magnitude of the vibration transmitted to the upper structure 3 exceeds a predetermined value. However, at this time, the air pump 27 can be made to function as a vacuum pump to suck air from the moving body 13. In that case, as shown in FIG. 3C, in addition to the frictional force determined by the material such as the moving body 13 and the load to be supported, the vibrational energy can be attenuated using the adsorption force, It becomes possible to obtain a higher damping capacity.

  Next, in the seismic isolation device 1, when the magnitude of the external force applied to the lower structure 2 or the magnitude of vibration transmitted to the upper structure 3 is less than a predetermined value, the air pump 27 is stopped to move the moving body When the supply of air to 13 is stopped and the magnitude of the external force applied to the lower structure 2 or the magnitude of vibration transmitted to the upper structure 3 exceeds a predetermined value, the air pump 27 is operated. The operation of supplying air to the moving body 13 will be described. By this operation, in a relatively small vibration region less than a predetermined value, until an external force corresponding to the magnitude of the frictional force determined by the material such as the moving body 13 and the load to be supported is input, the superstructure When the body 3 can be secured immovably, on the other hand, when the vibration is large and the magnitude of the external force exceeds a predetermined value, the body 3 is displaced with a small resistance force while keeping the natural period of the upper structure 3 longer. It can absorb and function like a trigger device.

  In the above embodiment, the operation of the air pump 27 is stopped when the magnitude of the external force applied to the lower structure 2 or the magnitude of vibration transmitted to the upper structure 3 is less than a predetermined value. At this time, the air pump 27 can also function as a vacuum pump to suck air from the moving body 13. In that case, in addition to the frictional force determined by the material such as the movable body 13 and the load to be supported, the upper structure 3 can be secured immovably with a larger force by using the adsorption force.

  Next, a seismic isolation structure to which the seismic isolation device 1 is applied will be described with reference to FIG.

  In this seismic isolation structure 41, three or more seismic isolation devices 1 are interposed between the foundation 42 and the detached house 43, and each seismic isolation device 1 transmits the load of the detached house 43 to the foundation 42. At the same time, a horizontal relative displacement is allowed between the foundation 42 and the detached house 43. When the foundation 42 is horizontally displaced during an earthquake or the like, the seismic isolation device 1 functions as described above, so that the horizontal vibration of the foundation 42 can be prevented from being transmitted as it is to the detached house 43 and the detached house. The natural period of 43 can be lengthened, and the acceleration to the detached house 43 can be reduced.

  Next, a second embodiment of the seismic isolation device according to the present invention will be described with reference to FIG. The seismic isolation device 51 is also interposed between a lower structure 52 such as a foundation of a detached house and an upper structure 53 such as a detached house that can move in the horizontal direction H with respect to the lower structure 52. Be dressed.

  The seismic isolation device 51 has a configuration in which the upper arm 11, the moving body 13, the closing member 15, and the like are excluded from the seismic isolation device 1 described in the first embodiment. In FIG. 5, the same components as those of the seismic isolation device 1 shown in FIG. As a result, it is possible to realize a seismic isolation device having a simpler configuration, and in a similar manner to the first embodiment, the natural period of the upper structure is lengthened regardless of the load to be supported, and acceleration is achieved. By obtaining a suitable frictional force as appropriate, it is excellent in vibration energy absorption capability and can also have a restoring characteristic.

  Next, a third embodiment of the seismic isolation device according to the present invention will be described with reference to FIG. The seismic isolation device 61 is also interposed between the lower structure 62 such as the foundation of a detached house and the upper structure 63 such as a detached house that can move in the horizontal direction H with respect to the lower structure 62. Be dressed.

  The seismic isolation device 61 has a configuration in which the lower arm 12, the moving body 14, the closing member 16, and the like are excluded from the seismic isolation device 1 described in the first embodiment. In FIG. 6, the same code | symbol is attached | subjected about the component same as the seismic isolation apparatus 1 shown in FIG. As a result, it is possible to realize a seismic isolation device having a simpler configuration, and in a similar manner to the first embodiment, the natural period of the upper structure is lengthened regardless of the load to be supported, and acceleration is achieved. By obtaining a suitable frictional force as appropriate, it is possible to have excellent vibration energy absorption capability and also have a restoring characteristic.

It is sectional drawing which shows 1st Embodiment of the seismic isolation apparatus concerning this invention. It is a figure which shows the moving body of the seismic isolation apparatus of FIG. 1, Comprising: (a) is a top view, (b) is the sectional view on the AA line of (a), (c) is the A section enlarged view of (b). It is. It is a hysteresis curve which shows the relationship between the horizontal resistance of the seismic isolation apparatus concerning this invention, and horizontal displacement amount (relative displacement of the upper structure 3 and the lower structure 2), Comprising: (a) is at the time of air supply, (b) Indicates a state in which no air is supplied or sucked, and FIG. It is the schematic which shows the seismic isolation structure using the seismic isolation apparatus concerning this invention. It is sectional drawing which shows 2nd Embodiment of the seismic isolation apparatus concerning this invention. It is sectional drawing which shows 3rd Embodiment of the seismic isolation apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Lower structure 3 Upper structure 11 Upper flange 11a Concave spherical lower surface 12 Lower flange 12a Concave spherical upper surface 13 Moving body 13a Convex spherical upper surface 13b Air supply port 13c Annular groove 13d Air outlet hole 13e Air outlet groove 13f Air outlet 14 Moving body 14a Convex spherical lower surface 14b Air supply port 14c Annular groove 14d Air outlet hole 14e Air outlet groove 15 Closing member 16 Closing members 17-22 Bolts 23, 24 Nut 25 Flexible hose 26 Connection fitting 27 Air pump 28 Flexible hose 29 Connection fitting 30 Air pump 41 Seismic isolation structure 42 Foundation 43 Detached house 51 Seismic isolation device 61 Seismic isolation device

Claims (14)

An upper collar having a concave spherical lower surface fixed to the upper structure and opening downward;
A lower rod having a concave spherical upper surface fixed to the lower structure and opening upward;
A movable body that is movably disposed between the upper collar and the lower collar,
The movable body has a convex spherical upper surface facing the concave spherical lower surface of the upper collar, and has a convex spherical lower surface facing the concave spherical upper surface of the lower collar, the convex spherical surface A seismic isolation device comprising an air blowing groove on the upper surface and / or the lower surface of the convex spherical surface. A lower rod having a concave spherical upper surface fixed to the lower structure and opening upward;
A movable body fixed to the upper structure and disposed on the lower arm,
The seismic isolation device, wherein the movable body has a convex spherical lower surface facing the concave spherical upper surface of the lower collar, and has an air blowing groove on the convex spherical lower surface. An upper collar having a concave spherical lower surface fixed to the upper structure and opening downward;
A movable body fixed to the lower structure and disposed below the upper arm,
The seismic isolation device, wherein the moving body has a convex spherical upper surface facing the concave spherical lower surface of the upper collar, and has an air blowing groove on the convex spherical upper surface. Air supply means for supplying air to the mobile body;
The air supply means controls air supply to the moving body according to the magnitude of an external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure. The seismic isolation device according to claim 1, 2 or 3.   The air supply means supplies air to the moving body when the magnitude of external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure is less than a predetermined value, When the magnitude of the external force applied to the structure or the magnitude of vibration transmitted to the upper structure is greater than or equal to a predetermined value, the supply of air to the moving body is stopped, or the air from the moving body The seismic isolation device according to claim 4, wherein the seismic isolation device is sucked.   The air supply means stops the supply of air to the moving body when the magnitude of external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure is less than a predetermined value. Or when the magnitude of external force applied to the lower structure or the magnitude of vibration transmitted to the upper structure is greater than or equal to a predetermined value when air is sucked from the movable body. The seismic isolation device according to claim 4, wherein the seismic isolation device is supplied.   The convex spherical upper surface of the moving body has the same curvature as the concave spherical lower surface of the upper collar, and the convex spherical lower surface of the movable body is the same as the concave spherical upper surface of the lower collar. The seismic isolation device according to claim 1, having a curvature of   The air blowing groove of the moving body is formed by a surface restriction, and a self-blowing shaped air blowing hole is formed in the bottom surface of the air blowing groove. The seismic isolation device according to any one of the above.   The seismic isolation device according to claim 8, comprising a plurality of combinations of the air blowing grooves formed by the surface restriction and the self-drawing shaped air blowing holes, wherein each combination is independent of each other.   The seismic isolation device according to claim 1, wherein the air blowing groove of the moving body is also used as an air suction groove when sucking air from the moving body.   At least one of the upper and lower surfaces of the moving body is formed of a polyphenylene sulfide resin or a reinforced synthetic resin in which at least one of glass fiber, carbon fiber, or inorganic filler is mixed in the polyphenylene sulfide resin. The seismic isolation device according to any one of claims 1 to 10.   The seismic isolation device according to claim 1, wherein the moving body is made of a metal material.   The said moving body consists of metal materials, and has a lubricating film which consists of molybdenum disulfide or DLC (Diamond like Carbon) on the surface of either upper and lower sides, The Claim 1 thru | or 10 characterized by the above-mentioned. Seismic isolation device.   A seismic isolation structure comprising at least three seismic isolation devices according to claim 1.

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