JP2013032810A - Base isolation structure having rolling base isolation support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve base isolation characteristics of a structure in which a rolling base isolation support device is installed using a rigid elliptical rolling element having long periodicity, revertability, and damping properties.SOLUTION: In a base isolation structure, usually an upper structure G and a bottom structure B are supported by a plane abutting part H having a large area, and the lifting force acts on the rolling base solation support device S having an internal pressure chamber J in which a rolling element 7 is incorporated and pressurized fluid acts. In an earthquake, the upper structure G is supported by following the rolling of the rolling element 7.

Description

  The present invention is a structural system composed of an upper structure such as a building / artificial ground and a lower structure such as a foundation, which are independent of each other and relatively movable in the horizontal direction, and supports the load of the upper structure as well as seismic motion, etc. A basic device for reducing the vibration of the upper structure against forced vibrations and isolating it, so-called a seismic isolation support device between the upper structure and the lower structure. The present invention relates to a base-isolated structure having a rolling base isolation support device via a rotator between the lower structure and the lower structure.

In the seismic isolation support device, which uses a rolling element such as a steel ball to perform seismic isolation, it is possible to obtain a sensitive response to seismic motion. There is also a problem of adding a return function to the original position after the earthquake motion.
From this point of view, the inventor previously provided an attenuation / restoration mechanism according to Japanese Patent Laid-Open No. 2005-273353 (Reference 1), Japanese Patent Application Laid-Open No. 2005-282247 (Reference 2), Japanese Patent Application Laid-Open No. 2006-153125 (Reference 3), and the like. A base-isolated base structure with constraining beams to prevent falls was proposed. However, in these techniques, the damping / restoring mechanism is complicated, and a special device such as a detection device is also required.
In view of this, the inventor of the present invention based on the knowledge that by making the rolling element into a spheroid, a return function can be provided and a longer period of oscillation can be achieved. Reference 4) (hereinafter referred to as the prior invention) proposed a rolling seismic isolation support device in which a damper steel bar is incorporated into a spheroid.
That is, according to the seismic isolation support device of the preceding invention, a spheroid rotator is interposed between the upper structure (building) G and the lower structure (foundation) B, and the spheroid is always present. The superstructure G is stably supported by the stable position state taken by the spheroid, and in the event of an earthquake, following the rolling characteristics of the spheroid, that is, following the rolling trajectory of the spheroid, the superstructure G has a longer period and returns by a return moment. In addition, the damper steel bar incorporated in the spheroid exhibits a damping action.

JP 2005-273353 A JP 2005-282247 A JP 2006-153125 A JP 2010-84910 A

The present invention is a further development of the prior invention, and is based on the idea that a more effective seismic isolation action can be obtained by adding a mechanism for reducing the load on the superstructure to the prior invention. .
For this reason, the present invention adopts a plane support other than the rolling element at normal times, and arranges the mechanism around the rolling element, and further arranges it at the contact portion between the upper structure and the lower structure. The aim is to obtain a new structure of rolling seismic isolation.
In particular, the present invention focuses on the point that the load on the rolling element is unloaded at all times, that is, in a fixed position where the upper and lower structures are stationary.

The seismic isolation system having the rolling seismic isolation support device of the present invention specifically adopts the following configuration.
A first aspect of the present invention relates to a seismic isolation structure having a rolling seismic isolation support device.
In a structure composed of an upper structure and a lower structure that are independent of each other and can move relative to each other in the horizontal direction,
The upper surface of the lower structure is formed as a flat surface,
Holding a predetermined area in a fixed position and transmitting the load of the upper structure to the lower structure with a flat contact portion;
Between the upper structure and the lower structure, a rolling seismic isolation support device having the following configuration is installed,
It is characterized by that.
a. A rigid load receiving plate whose upper surface forms the same level as the upper surface of the lower structure is fixed to the upper surface of the lower structure,
b. On the lower surface of the upper structure, a rigid load supporting cylinder made of a cylindrical body having a cylindrical internal pressure chamber opened downward is fixed,
c. A sealing member that seals between a facing portion with a smooth surface formed on the upper surface of the load receiving plate is fixedly held at the lower end of the cylindrical side wall portion of the load supporting cylinder,
d. In the internal pressure chamber of the load support cylinder, a rolling element made of a rigid body and having a spheroid shape whose surface curvature gradually changes, takes a minimum height in a fixed position state and has a horizontal movement range, The upper and lower sides are sandwiched between the lower surface of the ceiling wall portion of the load supporting cylinder and the upper surface of the load receiving plate with substantially no load,
e. A filling fluid is sealed in a pressurized state in the internal pressure chamber in a fixed position state,
f. A rod-shaped damper insertion hole is formed along the central axis of the rolling element, and the rod-shaped damper insertion hole of the rolling element is in a fixed position on the load receiving plate and the ceiling wall portion of the load supporting cylinder. The rod-shaped damper insertion pipes having the rod-shaped damper insertion holes on the same straight line are arranged so as to maintain hermeticity. And
g. The rolling element supports the load of the upper structure in a rolling state in a relative movement between the upper structure and the lower structure.
The first invention is an inventive idea including the following first and second embodiments.
The second aspect of the present invention relates to a seismic isolation structure having another rolling seismic isolation support device. As described in claim 2, in the first aspect of the present invention, a rolling isolation system is provided between the upper structure and the lower structure. In addition to the support device, an internal pressure chamber device having the following configuration is installed.
a. On the lower surface of the upper structure, a rigid load supporting cylinder made of a cylindrical body having a cylindrical internal pressure chamber opened downward is fixed,
b. A sealing member that seals between the facing portion of the upper surface of the lower structure and the smooth surface is fixedly held at the lower end of the cylindrical side wall portion of the load supporting cylinder,
c. A filling fluid is sealed in the internal pressure chamber in a pressurized state in a fixed position.
In the first invention and the second invention, instead of the component f term of the rolling seismic isolation support device, a rod-shaped damper insertion hole is opened along the center axis of the rolling element, and one end is provided in each of the upper and lower structure. A rolling seismic isolation support device is installed between the upper structure and the lower structure, and the other end is fixed in a solid state and the other end is inserted into the steel rod damper insertion hole. Seismic isolation structures constitute another invention.
In the first invention and the second invention, the seismic isolation structure is characterized in that the planar abutting portion of the upper structure with respect to the lower structure is cast-in-place concrete placed on the upper surface of the lower structure via a sliding surface. Another invention is constituted. The present invention is shown in the following first embodiment.
In the first and second inventions described above, the flat abutting portion of the upper structure with respect to the lower structure is suspended below the rigid structure mounted and fixed on the load supporting cylinder of the seismic isolation support device. A seismic isolation structure characterized by the bottom of the body also constitutes another invention. This invention is shown in the following second embodiment.

In the first and second inventions and other inventions thereof, the “lower structure” and the “upper structure” are the foundation as the lower structure, the building as the upper structure supported by the foundation, and the artificial structure described in the following embodiments. It is not limited to the ground alone, but includes the structure of the lower layer (lower plate) and the upper layer (upper plate) with the upper and lower surfaces in the hierarchy in the building as a boundary. The “constant position state” means a normal state of the upper structure, in other words, a stationary state of the upper structure, and further means a stable state of the rolling element.
In addition, the “spheroid shape” of the rotator is not limited to the spheroid (ellipsoid), the surface curvature gradually changes, and the height between the contact points of the upper and lower parallel surfaces gradually increases as it rolls. This includes all the shapes of the spheres, and is specifically shown in the following embodiments. Further, the “substantially no load” means a load sufficient to keep the upper and lower surfaces of the rolling element sandwiched between the lower surface of the ceiling wall portion of the load supporting cylinder and the upper surface of the load receiving plate. Including no load.
When the upper structure takes the artificial ground, the building body is constructed on the artificial ground, and the artificial ground is supported by the lower structure serving as the foundation via the flat contact portion and the rolling element.
In the first and second inventions described above,
1) The upper surface of the load receiving plate is made smooth on the contact surface with the sealing member, and the remaining upper surface of the load receiving plate and the lower surface of the ceiling surface of the load supporting cylinder are also made smooth. ,
2) In the item f of the rolling seismic isolation support device, a through-hole is provided along the center of the rolling element, and a rod-shaped damper insertion tube having a rod-shaped damper insertion hole is disposed in a constrained manner in the through-hole.
3) Similarly, in item f, the rod-shaped damper insertion pipes arranged on the load receiving plate and the ceiling wall portion of the load supporting cylinder are attached to the lower surface of the load receiving plate and the upper surface of the ceiling wall portion of the load supporting cylinder. The rod-shaped damper insertion holes are directly formed on the load receiving plate and the ceiling wall portion of the load supporting cylinder,
4) The rolling element is not limited to omnidirectional movement in the horizontal direction, and adopts a unidirectional displacement.
Is an embodiment appropriately taken.

(Function)
The seismic isolation system having the rolling seismic isolation support device of the present invention exhibits the following effects by adopting the above configuration.
The seismic isolation structure having the rolling seismic isolation support device of the present invention always receives the uplift force acting on the internal pressure chamber and transmits the reduced load of the upper structure G to the lower structure B at the plane contact portion thereof. In the event of an earthquake, the load of the upper structure G is transmitted to the lower structure B in response to the support action of the seismic isolation support device interposed between the upper structure G and the lower structure B, and the rolling element rolls. Demonstrates seismic isolation against earthquake motion.

(A) Always At all times, the upper structure G and the lower structure B make a plane contact with a large area as a fixed position, and the load of the upper structure G is transmitted to the lower structure B through the plane contact surface.
Moreover, the rolling seismic isolation support device S takes a fixed position state.
That is, in the fixed position state of the rolling seismic isolation support device S, the inner pressure chamber is filled with a filling fluid through the piping system at a predetermined pressure, and the filling fluid in the inner pressure chamber is externally formed by a sealing member and other real actions. Without being leaked out, and kept in a predetermined pressure state. As a result, an uplift force acts on the upper structure G, and the pressure at the contact surface of the upper structure G is reduced (approximately 80% is taken as a guide). The load (effective load) of the superstructure G reduced by receiving the lifting force is not affected by a small lateral force such as a wind load. Furthermore, it is effective to take measures corresponding to an increase in lateral load by reducing the pressure in the internal pressure chamber.
The rolling elements in the rolling seismic isolation support device S are installed in a neutral state, that is, a stable state with the largest curvature surface up and down in a fixed position state. In this state, the upper and lower parts of the rolling element are sandwiched between the lower surface of the ceiling portion of the load supporting cylinder and the upper surface of the load receiving plate, but the rolling element does not substantially support the load. Further, the steel rod damper is unloaded in the fixed position state, but the above-described uplift force can be further increased by adopting an installation state showing resistance for a small forcing force such as a wind load.

(B) At the time of an earthquake During the earthquake (and in all cases where a force that causes shaking is applied to the structure), the ground shakes greatly, and the foundation B as the substructure is integrated with the ground due to the forced displacement of the earthquake motion. Although the upper structure G vibrates, the upper structure G swings with the vertical movement through the rolling action of the rolling elements, and a relative displacement occurs between the upper structure G and the lower structure B. In the initial motion of this earthquake, the friction of the upper structure is extremely small due to the uplift force that was acting at all times, and the relative movement between the upper structure and the lower structure occurs smoothly, thereby urging the rolling elements to roll. This upward lifting force is lost by the upward movement of the superstructure G.
The rolling element in contact with the upper structure G also rolls with the movement of the upper structure G, and the upper structure G supported by the rolling element follows the rolling locus of the rolling element. When the superstructure G moves in the reverse direction, the above operation is reversed.
Along with the earthquake motion, the superstructure G follows the rolling trajectory of the rotator and makes a translational oscillating motion accompanied by the vertical motion, so that the structure G has a oscillating action with a large period due to the rolling action of the rotator. Therefore, adverse effects such as resonance due to earthquake motion can be avoided.
In addition, the rod-shaped damper is deformed along with the rolling of the rolling element, and a damping force is generated as the deformation energy is consumed. Further, a restoring force (restoring moment) is also generated due to the movement of the point of action due to the rolling movement of the rolling element. To do.
(B-1) For initial motion When there is an initial motion of a large earthquake motion above a certain level, the superstructure G is apparently a small vertical load due to the action of the uplift force at all times, and is in contact with a large area. The friction acting on the contact surface of the upper structure with the lower structure is extremely small, and the relative movement between the upper structure and the lower structure occurs smoothly and immediately, and the rolling element rolls. In other words, this lifting force acts to promote the rolling movement of the rolling element, the rolling is started without delay to the initial motion of the earthquake, and then the effect of this lifting force is lost. The structure G smoothly shifts to the swing displacement.
(B-2) Seismic isolation / damping action The rolling element in contact with the upper structure G rolls with the movement of the upper structure G, and the upper structure G supported by the rolling element moves the rolling element. Follow the rolling trajectory of the child with translation. When the superstructure G moves in the reverse direction, the above operation is reversed.
Accompanying the earthquake motion, the superstructure G follows the rolling trajectory of the rolling element, and performs a swinging motion accompanied by a vertical motion. This swinging motion realizes translation and has no inclination. As a result, the structure G is subjected to a translational rocking action with a large period due to the rolling action of the rolling elements, and adverse effects such as a resonance action due to earthquake motion can be avoided.
In addition, in the swing displacement of the integral structure system of the superstructure G and the rolling element, the rod-shaped damper is inserted into the rod-shaped damper insertion tube of the load receiving plate and the load supporting cylinder as the rolling displacement of the rolling element to the left and right. It is pulled out from the rod-shaped damper insertion tube, and pulled in and forcibly undergoes bending deformation. A damping force is exhibited by the energy absorption effect by the bending action, and the vibration of the superstructure G is damped. In another aspect of the rod-shaped damper (Claim 3), the upper and lower rod-shaped dampers are each pulled out from the rod-shaped damper insertion hole of the rolling element, and are pulled in and forcibly subjected to bending deformation, thereby exhibiting a damper action. .
(B-3) Returning action With the rolling displacement of the rolling element, the upper contact on the rolling locus of the rolling element gradually moves upward (rises) when the structure G moves away from the original fixed position. A lifting force is applied to the upper structure G supported by the child. Moreover, in the return displacement from the uppermost point to the initial position (neutral position), it is in a descending state and rises again after passing the lowermost point.
During this time, an eccentric distance in the horizontal direction is generated between the lower contact and the upper contact, and an eccentric moment is generated with the lower contact as a supporting point due to the load of the upper structure G acting on the upper contact, and a restoring moment (2 in the opposite parallel direction) is generated. It functions as a return couple), that is, a return force. As a result, the upper structure G exhibits the characteristic of returning to the normal state, that is, the initial fixed position state, and the seismic isolation structure returns to the stable state with the end of the forced horizontal force, that is, the seismic force.
(B-4)
As described above, the seismic isolation structure achieves a long period of the structural system in the event of an earthquake, avoids resonance with the ground motion, and receives the damping function of the seismic isolation support device S to act on the structure. Is quickly damped, and the structure quickly returns to its initial position in response to a restoring moment (in other words, a return couple). Furthermore, the initial motion of the base isolation is smoothly performed by the lifting force, and there is no impact on the superstructure G.
After returning to the initial position, the upper structure G is again placed on the lower structure through a wide contact surface, and the internal pressure chamber is pressurized to reduce the ground pressure again. Prepare for earthquake motion.
According to the configuration in which the internal pressure chamber device is added, in addition to the above-described action, a lifting force is further added, the ability to reduce the load of the superstructure G is increased, and the response to the initial motion of the earthquake is enhanced.

According to the seismic isolation structure of the present invention, the upper structure G is always subjected to the lifting force and its load is apparently reduced, and the load is applied to the lower structure B by the wide planar contact portion with the lower structure B. Durability is assured for a long time with stable support without burden. During an earthquake, the apparent friction of the upper structure G is reduced, so that the static frictional force with the flat contact portion of the lower structure B is extremely small. Is immediately started, and the rolling element incorporated in the seismic isolation support device S immediately rolls, and the superstructure G follows the rolling trajectory of the rolling element for a long period and has a return force. A seismic action is applied, and the superstructure G becomes a translational shake and no abnormal stress is generated. In addition, rapid damping is exhibited by a damper mechanism that is linked to the rolling element.
Then, in the seismic isolation support device S, the rolling element can be held in a predetermined movement space to deal with all directions of the horizontal plane.
According to the configuration in which the internal pressure chamber device is added, in addition to the above-described effects, a lifting force is further added, and the ability to reduce the load on the superstructure G can be increased. The pressure burden can be reduced.

The sectional side view which shows the structure of the principal part of the seismic isolation structure which has the rolling seismic isolation support apparatus of one Embodiment of this invention. The vertical sectional view which shows the whole structure of the rolling seismic isolation device applied to this seismic isolation structure (partial enlarged view of FIG. 1, sectional view taken along line 2-2 of FIG. 3). The plane block diagram which shows the whole structure of a seismic isolation support apparatus (3-3 line sectional drawing of FIG. 2). Detailed view of seismic isolation support device (attachment of sealing member). The figure which shows the piping system of the filling fluid of a seismic isolation support apparatus. The schematic block diagram of the one aspect | mode (elliptical rotary body) of a rolling element. The schematic block diagram of another aspect of a rolling element. Detailed view of seismic isolation support device (installation of steel bar damper). The example of arrangement | positioning of the seismic isolation support apparatus and internal pressure chamber apparatus in this seismic isolation structure is shown, (a) The figure is the side view, (b) The figure is the top view. The example of arrangement | positioning to the artificial ground of a seismic isolation support apparatus and an internal pressure chamber apparatus is shown, (a) The figure is the side view, (b) The figure is the top view. The figure which shows operation | movement of a seismic isolation support apparatus. The figure which shows operation | movement of a seismic isolation support apparatus. The figure which shows the attachment aspect of the other rod-shaped damper in a seismic isolation support apparatus. The vertical sectional view which shows the structure of the internal pressure chamber apparatus applied to this seismic isolation structure. Side sectional drawing which shows the structure of the principal part of the base isolation structure which has the rolling base isolation support apparatus of other embodiment of this invention. The example of arrangement | positioning of the seismic isolation support apparatus etc. in the seismic isolation structure of other embodiment of this invention is shown, (a) A figure is the side view, (b) The figure is the top view.

An embodiment of a seismic isolation structure having a rolling seismic isolation support device of the present invention will be described based on the drawings.
(First embodiment)
FIGS. 1-8 shows one Embodiment (1st Embodiment) of this seismic isolation structure, S is a rolling seismic isolation support apparatus (henceforth "seismic isolation support apparatus") integrated in this seismic isolation structure. Indicates. That is, FIG. 1 shows a schematic configuration of a seismic isolation structure in which a plurality of seismic isolation support devices S are incorporated, FIG. 2 shows a longitudinal sectional configuration of the seismic isolation support device S, FIG. 3 shows a plan configuration thereof, and FIG. FIG. 8 shows a partial configuration of the seismic isolation support device S and a detailed configuration of its characteristic part. Moreover, FIG. 9, FIG. 10 shows the arrangement | positioning aspect of this seismic isolation structure, and FIG. 11, FIG. 12 shows the operation | movement at the time of the earthquake.
In the illustration of the seismic isolation structure, X indicates a longitudinal direction, Y indicates a width direction, and Z indicates a height direction.

The seismic isolation structure of the present embodiment is composed of an upper structure G and a lower structure B that are independent of each other and can be relatively moved in the horizontal direction, and the lower surface Ga and the lower structure of the upper structure G in a fixed position state, that is, a stationary state. The upper surface Ba of B is in flat contact, and the load of the upper structure G is transmitted to the lower structure B via the flat contact portion H, and the base structure B and the lower structure B are rolled to support seismic isolation. The apparatus S is installed.
Therefore, the rolling seismic isolation device S is
a. On the upper surface of the lower structure B, a rigid load receiving plate 1 whose upper surface forms the same level surface as the upper surface Ba of the lower structure is fixed.
b. On the lower surface of the upper structure G, a rigid load supporting cylinder 2 made of a cylindrical body having a cylindrical internal pressure chamber opened downward is fixed,
c. The lower end of the cylindrical side wall portion of the load supporting cylindrical body 2 is fixedly held with a sealing member 3 for sealing between the facing portion with the smooth surface formed on the upper surface of the load receiving plate 1,
d. In the internal pressure chamber of the load supporting cylinder 2, a rolling element 7 made of a rigid body and whose surface curvature gradually changes into a spheroid shape takes a minimum height in a fixed position and has a moving range in the horizontal direction. And
The upper and lower sides are sandwiched between the lower surface of the ceiling wall portion of the load supporting cylinder 2 and the upper surface of the load receiving plate 1 with substantially no load,
e. A filling fluid is sealed in a pressurized state in the internal pressure chamber in a fixed position state,
f. A rod-shaped damper insertion hole is formed along the central axis of the rolling element 7, and the rod-shaped damper insertion hole of the rolling element in a fixed position on the load receiving plate and the ceiling wall portion of the load supporting cylinder. A rod-shaped damper insertion tube having a rod-shaped damper insertion hole that is collinear with the rod-shaped damper insertion hole is arranged so as to maintain hermeticity, and the rod-shaped damper insertion hole can be moved without being removed even in the moving state of the rolling element. Arranged,
g. The rolling element 7 supports the load of the upper structure G in a rolling state in relative movement between the upper structure G and the lower structure B.
Is.

Hereinafter, the detailed structure of each part will be described.
Flat contact part H (See Fig. 1)
The upper structure G and the lower structure B form a rigid body, regardless of on-site molding or precast molding. In this embodiment, both are formed with in-situ reinforced concrete.
Thus, in this embodiment, the lower surface Ga of the upper structure G and the upper surface Ba of the lower structure B form a smooth surface, and make a planar contact with a large area in a fixed position, via the planar contact portion H. The upper structure G is slidably supported on the lower structure B, and transmits the load of the upper structure G to the lower structure B.
In the present embodiment, the flat abutting portion H is composed of all the planes excluding the occupied area portion of the seismic isolation support device S. It is free to provide a contact portion (that is, a gap portion).
Since the plane contact portion H has a sufficiently large area, the pressure on the lower structure B of the upper structure G is small, and in addition, it receives an uplift force acting on the seismic isolation support device S described later. The load on the upper structure G is reduced (with 80% as a guide), and the apparent pressure (effective pressure) on the lower structure B of the upper structure G is extremely small.

Load receiving plate 1 (See Figs. 1 and 2)
The load receiving plate 1 is made of a rigid flat plate having a predetermined thickness with a hard material (usually made of steel), and is fixed to the upper surface of the lower structure B at the same level. The upper surface 1a of the load receiving plate 1 is a smooth surface and requires solidity (including airtightness and watertightness) in addition to rigidity in order to maintain various functions described later.

Load support cylinder 2 (see FIGS. 1 to 4)
The load supporting cylindrical body 2 is formed of a cylindrical rigid structure that is opened downward with a predetermined thickness and includes a cylindrical side wall portion 12 and a ceiling wall portion 13, and is integrated with the upper structure G to be integrated with the lower structure B. Contributes to the transmission of load to That is, as will be described later, the load supporting cylinder 2 does not transmit the load of the upper structure G when stationary, but directly transmits the load of the upper structure G when the upper structure G moves or lifts. is there. In addition, a true circular internal pressure chamber J to be pressurized is formed inside the load supporting cylinder 2. For this reason, in addition to rigidity, the load supporting cylinder 2 is made of a material having a solidity (airtightness, watertightness).
Specifically, the cylindrical side wall portion 12 has an enlarged-diameter wall portion 12a at the lower portion thereof, the lower end surface thereof is smoothed, and an annular groove 14 is provided facing the lower end surface. 14, the attachment holes 15 are formed at a plurality of locations (6 in the present embodiment) on the circumference from the upper surface of the enlarged wall portion 12 a. The ceiling surface 13a of the ceiling wall part 13 forms a smooth or normal level surface. As will be described later, a through hole for a predetermined member is opened in the ceiling wall portion 13, but the main body portion itself is kept solid.

Sealing member 3 (see FIGS. 2, 3 and 4)
The sealing member 3 is made of a rubber annular body having a circular cross section of the main body portion 3a, and mounting projections 3b project from the mounting holes 15 at a plurality of portions on the upper surface of the annular body. The mounting projection 3b is inserted into the mounting hole 15 in a crimping manner, and the main body 3a of the sealing member 3 is accommodated in the concave groove 14 of the cylindrical side wall 12 of the load supporting cylinder 2. The mounting projection 3b is inserted into the mounting hole 15 in a pressure-bonding manner, and prevents the main body 3a of the sealing member 3 from falling out of the concave groove 14.
The main body 3a of the sealing member 3 has a so-called O-ring function, and exerts a sealing action against pressurization of the internal pressure chamber J with a predetermined compression rate by contact with the upper surface 1a of the load receiving plate 1.
In addition, the load receiving plate 1 should just be a smooth surface at least in the site | part which contact | abuts this sealing member 3, and the other site | part does not need to be a special smooth surface. Similarly, the lower surface of the ceiling wall portion 13 of the load supporting cylinder 2 may not be a particularly smooth surface.
Further, the sealing member 3 is not limited to the illustrated example as long as the sealing member 3 is fixed to the lower surface of the load supporting cylinder 2 and exhibits a sealing action with a required compression rate.

Supply pipe 4 and discharge pipe 5 (see FIGS. 1, 2 and 5)
The supply pipe 4 and the discharge pipe 5 are arranged in such a way that the outside and the internal pressure chamber J are communicated with each other at the possible corners of the ceiling wall portion 13 of the load supporting cylinder 2 while maintaining solidity (airtightness, watertightness). . That is, the filling fluid K is sent from the outside to the internal pressure chamber J through the supply pipe 4, and the filling fluid K in the internal pressure chamber J is discharged to the outside through the discharge pipe 5. In addition, the supply pipe 4 and the discharge pipe 5 may be an appropriate place on the cylindrical side wall portion 12 of the load supporting cylinder 2.
FIG. 5 shows a piping system connected to the supply pipe 4 and the discharge pipe 5, and the supply system piping 4 a is drawn to the outside and connected to the pressure pump 18 via the check valve 17. The discharge piping 5a is also drawn outside and connected to the on-off valve 19 (normally closed).
In this piping system, appropriate piping elements are further added depending on the state of the filling fluid K (gas, liquid). For example, when the filling fluid K is a liquid system, it goes without saying that a liquid tank is connected to the tip of the pumping pump 18.
(Filling fluid K)
The filling fluid K is appropriately selected from both gas and liquid modes (incompressible and small compressibility), but air and water are preferably used from the viewpoint of avoiding adverse effects on the environment.

(Pressure holding in internal pressure chamber J)
By sealing the internal pressure chamber J of the load supporting cylindrical body 2 by the contact of the load receiving plate 1 with the sealing member 3, the internal pressure chamber J of the load supporting cylindrical body 2 constitutes a sealed space, and the desired pressure is achieved. Holds. That is, the inside of the internal pressure chamber J receives a predetermined pressure by the filling fluid K fed into the internal pressure chamber J, and as a result, acts as an uplift force on the upper structure G and bears a considerable proportion of the load of the upper structure G. In the present embodiment, a load reduction of about 80% of the total load of the upper structure G is expected by all the internal pressure chambers J of the plurality of seismic isolation devices S installed in the present structural system.

Roller 7 (See FIGS. 1-3, 6 and 7)
The rolling element 7 is made of a rigid spheroid, and the upper and lower sides thereof are sandwiched between the load supporting cylinder 2 (its ceiling wall portion 13) and the load receiving plate 1, and the internal pressure chamber J of the load supporting cylinder 2 is fixed. There is a moving area in the horizontal direction inside. The present spheroid is a three-dimensional shape obtained by rotating an elliptical plane including the center point O about the minor axis as the rotation axis. In this spheroid, as shown in FIG. 6, a (X direction), b ( (Y direction) is the major axis, c (Z direction) is the minor axis, and a = b> c.
That is, in the case of a round sphere, the vertical distance between the upper and lower surfaces G and B between the upper and lower structures G and B, that is, the vertical distance between the contacts N and M, that is, the height takes a constant value. The surface curvature gradually changes, and a three-dimensional shape in which the height between the contact points on the upper and lower surfaces gradually increases as it rolls. Therefore, the height between the contact points on the upper and lower surfaces gradually decreases when rolling in the original position direction. As such a sphere, besides a spheroid, a paraboloid, a three-dimensional shape of catenary lines and clothoid lines is adopted.
In FIG. 6, the rolling element 7 forming a spheroid is in a fixed position, its lower surface portion is at the upper surface 1 a and the M point of the load receiving plate 1, and the upper surface portion is at the lower surface 13 a and the N point of the ceiling wall portion 13. The height is a minimum value of h (= 2c). In the present embodiment, the upper and lower surfaces of the rolling element 7 correspond to the upper and lower end surfaces of a steel rod damper insertion tube 9a disposed in the rolling element 7, which will be described later. It should be noted that in this fixed position state, the burden on the load of the upper structure G of the present rolling element 7 is substantially zero. That is, the upper and lower surface portions of the rolling element 7 are sandwiched between the upper and lower structures G and B, but the load transmission between the upper and lower structures G and B is performed by the plane contact portion H as described above. The burden is negligible at the site of the rolling element 7.
When the spheroid roller 7 rolls and tilts, the upper surface 13a is lifted, and the distance between the contact points N and M with the upper and lower surfaces gradually increases. At the same time, the reaction force is received from the upper and lower surfaces, and they act as couples having the same size and the opposite directions, and give the rolling element 7 a restoring force. In this figure, 7a is a cut plane obtained by cutting the side surface of the spheroid 7, and only the lower surface and the vicinity of the upper surface can be used.
FIG. 7 shows yet another sphere 7A. In this aspect, the upper surface and the lower surface have a radius of curvature R that is sufficiently larger than the distance r from the center O to form a partial sphere. In this embodiment, the surface curvature has a constant value, but exhibits the same dynamic characteristics as the spheroid rolling element 7, and the structure placed on the sphere 7A by taking a large R value. Can be prolonged.
As the rigid material of the present rolling element 7, an appropriate material such as iron (steel, cast iron), high-strength concrete, or hard synthetic resin can be adopted as a material that maintains a predetermined strength (compressive strength). In terms of form, high-strength concrete is preferably used because of its weight and cost. In high-strength concrete, the compressive strength is 60 N (Newton) / square mm, and sufficient rigidity is obtained.

(Arrangement of the rolling element 7)
The present rolling element 7 (outer diameter d = 2a, 2b) has its central axis aligned with the center of the inner pressure chamber J (inner diameter D) of the load supporting cylinder 1, and in the inner pressure chamber J in all horizontal directions. A movable space (Dd), that is, a moving area is provided. At this time, the rolling element 7 takes a fixed position and maintains a stable state.

Damper mechanism (see Figs. 1-3, 8)
The steel rod damper insertion tube 9 and the steel rod damper 10 constitute a “damper mechanism”. A steel rod damper insertion hole 8 is formed in the steel rod damper insertion tube 9, and the steel rod damper 10 moves while being guided by the steel rod damper insertion hole 8.

Steel rod damper insertion tube 9 (see FIGS. 1 to 3 and FIG. 8)
The steel rod damper insertion tube 9 has a steel rod damper insertion hole 8 therein, and is formed of a circular tubular body of a rigid material (generally made of iron) having a predetermined thickness. The rolling element 7, the load receiving plate 1, the load Each of them is arranged in a penetrating manner on the ceiling wall portion 13 of the support cylinder 2.
That is, the steel rod damper insertion tube 9 is disposed in the steel rod damper insertion tube 9 a disposed in the rotator 7, the steel rod damper insertion tube 9 b disposed in the load receiving plate 1, and the load support cylinder 2. The steel rod damper insertion tube 9c further includes a lid 9d at the upper end of the steel rod damper insertion tube 9c. 8a, 8b and 8c are steel rod damper insertion holes 8 of the steel rod damper insertion tubes 9a, 9b and 9c, respectively. And these steel rod damper penetration pipes 9a, 9b, and 9c take the state which end surfaces mutually contact in the fixed position state of the rolling element 7. FIG.
More specifically, the steel rod damper insertion tube 9a disposed in the rolling element 7 is disposed in a constrained state in a hole formed along the central axis of the rolling element 7, and the upper and lower end surfaces thereof are flat. In addition, the upper and lower end surfaces of the rolling element 7 are flush with each other.
The bottomed steel rod damper insertion tube 9b disposed on the load receiving plate 1 has an upper end flush with the upper surface of the load receiving plate 1, that is, a flat surface. The steel rod damper insertion tube 9b extends downward from the lower surface of the load receiving plate 2, and a housing 22 projects from the outer surface of the steel rod damper insertion tube 9b. The load receiving plate 1 is firmly fixed to the load receiving plate 1 through welding).
The steel rod damper insertion tube 9c disposed in the load supporting cylinder 2 has a lower end flush with the lower surface of the ceiling wall portion 13 of the load supporting cylindrical body 1, that is, a flat surface, from the upper surface of the ceiling wall portion 13. It extends long upwards. The steel rod damper insertion tube 9b also has a housing 23 projecting from the outer surface thereof, and is firmly attached to the ceiling wall portion 13 of the load supporting cylinder 1 by a fixture (including welding) through the housing 23. It is fixed. The upper end of the steel rod damper insertion tube 9c is opened, closed with a lid 9d, and used for the operation of inserting the steel rod damper 10.
And in the fixed position state of the rolling element 7, the end surfaces of these steel rod damper insertion pipes 9a, 9b, 9c are brought into contact with each other.
In addition, the steel rod damper insertion tube 9a to the rotator 7 is abolished, the opening hole of the rotator 7 is used as a steel rod damper insertion hole 8a, and the upper and lower surface portions of the rotator 7 are connected to the steel rod damper insertion tubes 9b and 9c. It is not excluded to take the abutment mode.

Steel bar damper 10 (See FIGS. 1 to 3 and FIG. 8)
The steel rod damper 10 is mainly composed of a steel rod having a predetermined elasto-plastic characteristic, and a steel rod damper insertion hole of a steel rod damper insertion tube 9 disposed on the rolling element 7, the load receiving plate 1, and the load supporting cylinder 2. 8 is inserted.
Thus, as the rolling element 7 rolls, the steel rod damper 10 is guided by the steel rod damper insertion hole 8 of the steel rod damper insertion tube 9 and deforms as it moves.
In addition, although the steel rod damper 10 employ | adopted the single rod-shaped body in this embodiment, use of the several small diameter steel wire is also included.

(Construction of this seismic isolation structure and placement and installation of seismic isolation support device S)
This seismic isolation structure is intended for a light or heavy structure building such as a wooden structure, a steel frame structure, a reinforced concrete structure or the like as the superstructure G, and the seismic isolation support device S is arranged symmetrically with respect to the building G. .
FIG. 9 shows one mode of the arrangement.
In the figure, B is a foundation as a lower structure constructed by being connected to a foundation pile P placed on the ground E, and the upper surface of the foundation B is constructed on the same level surface smoothly. A plurality of seismic isolation devices S are arranged symmetrically on this foundation B (eight locations in the example), and the building body G is simultaneously or on the base B and these seismic isolation devices S. It is built by placing. In a wooden lightweight building, the construction of the foundation pile P is not particularly necessary.
Thereby, the base isolation structure in the structure by the foundation B, the base isolation support apparatus S, and the building main body G is comprised.

In constructing and constructing the base-isolated structure, when constructing the foundation B on-site concrete, a plurality of load receiving plates 1 having steel rod damper insertion pipes 9b attached to the upper surface Ba (FIG. 1) of the foundation B have their upper surfaces 1a. Are buried and installed at the same level.
After the foundation concrete of the foundation B is consolidated, the load supporting cylinder 2 in which the sealing member 3 and the rolling element 7 as well as the supply pipe 4 and the discharge pipe 5 are incorporated on each load receiving plate 1 on the foundation B is provided. Each is installed. At this time, the sealing member 3 abuts against the upper surface 1a of the load receiving plate 1 while maintaining a sealing action, and the steel rod damper insertion tube 9a of the rolling element 7 and the steel rod damper insertion tube 9c of the load supporting cylinder 2 are The steel rod damper insertion tube 9b of the load receiving plate 1 already installed is arranged on the same vertical line. Then, the steel rod damper 10 is inserted into the steel rod damper insertion tube 9 composed of the steel rod damper insertion tubes 9a, 9b, 9c, and is closed by the lid body 9d. In addition, a piping system (a supply system 4 a and a discharge system 5 a) is connected to the supply pipe 4 and the discharge pipe 5.
After each load supporting cylinder 2 is installed, the floor slab concrete of building G (part of building G) has a sufficient thickness from the upper surface of foundation B and the upper surface of ceiling wall portion 13 of each load supporting cylinder 2. It is driven and kept. At this time, with respect to the foundation B, a release agent is applied to the upper surface, and the edge with the cast concrete is cut to keep the slip. Further, a shielding material (or a masking material, indicated by a symbol W in FIG. 2) is enclosed on the lower side surface of the load supporting cylinder 2 so that uncured floor slab concrete does not flow into the lower surface of the load supporting cylinder 2. It is an effective means to attach to. The masking material W is a non-essential matter in the seismic isolation structure. In addition, the thickness of the cast concrete of the floor slab does not need to be the same on the upper surface of the foundation B and the upper surface of the ceiling wall portion 13 of the load supporting cylinder 2, and the thicknesses may be different. It is important that the floor slab and the load supporting cylinder 2 are integrated. As a result, the load of the building G is loaded on the foundation B and the ceiling wall portion 13 of the load supporting cylinder 2.

In order to fully perform the functions of the seismic isolation support device S and the seismic isolation structure in which the seismic isolation support device S is incorporated, a piping system derived from the supply pipe 4 and the discharge pipe 5 of the seismic isolation support device S (supply Predetermined operating devices (a check valve 17, a pressure pump 18, and an on-off valve 19) are connected to the system 4a and the discharge system 5b).
Furthermore, it is also an effective measure to introduce a predetermined pressure to the seismic isolation support device S before the entire building G is constructed, and to add an operation of cutting the edge with the foundation B.

Moreover, FIG. 10 shows one aspect | mode of arrangement | positioning of the seismic isolation support apparatus S in the artificial ground as one form of this seismic isolation structure. In this aspect, an artificial ground G1 applied to a detached house, that is, a small-scale artificial ground is shown.
In the artificial ground G1 of this aspect, the foundation B is constructed directly on the ground E while keeping the horizontal, the load receiving plate 1 with the steel rod damper insertion tube 9b is arranged on the foundation B, and the rolling element 7 And the upper part of the seismic isolation support device S of the load supporting cylinder 2 is arranged, and then the artificial ground G1 is constructed by in-situ concrete casting in the manner described above (use of a release material and a masking material). Sealing member 3, steel rod damper insertion pipes 9a and 9c, lid body 9d, steel rod damper 10, supply pipe 4, discharge pipe 5 and their piping systems are arranged in the upper part of seismic isolation support device S. Of course. After the construction of the artificial ground G1, the residential building G2 is constructed directly on the manhole ground G1.
Thereby, the base isolation structure in the structure by foundation B, base isolation support apparatus S, artificial ground G1, and building main body G2 is comprised. In this aspect, the artificial ground G1 constitutes the original superstructure G.

(Operation of this seismic isolation structure)
The seismic isolation structure having the seismic isolation support device of the present embodiment always applies the reduced load of the upper structure G of the building (or artificial ground) to the lower structure B of the concrete foundation via the flat contact portion H. In the event of an earthquake, the load of the upper structure G is transmitted to and supported by the lower structure B in response to the support action of the rolling elements 7 of the seismic isolation support device S interposed between the upper structure G and the lower structure B. , The rolling element 7 exerts a seismic isolation action against the earthquake motion.

(A) Always A predetermined operating device, that is, a supply system pipe 4a, is connected to a piping system derived from the seismic isolation support device S, and a check valve 17 and a pressure pump 18 are connected to a discharge system pipe 5b. Is connected to the on-off valve 19. The filling fluid K pumped from the pump 18 is guided to the internal pressure chamber J, and when the internal pressure chamber J is filled with a predetermined pressure, the on-off valve 19 is closed. The filling fluid K in the internal pressure chamber J does not leak to the outside by the sealing member 3. In the present embodiment, air is used as the filling fluid K.
As a result, an uplift force acts on the upper structure G.
The upper structure G and the lower structure B make a plane contact with a large area as a fixed position state, and transmit the load of the upper structure G to the lower structure B through the plane contact part H. As a result, the pressure at the contact surface H of the upper structure G is reduced (approximately 80% as a guide). The load (effective load) of the superstructure G reduced by receiving the lifting force is not affected by a small lateral force such as a wind load. Furthermore, it is effective to take measures corresponding to an increase in lateral load by reducing the pressure in the internal pressure chamber.
On the other hand, the rolling element 7 in the seismic isolation support device S in a fixed position is installed in a neutral state (in other words, a stable state) with the largest curvature surface up and down. The portion is sandwiched between the lower surface 13a of the ceiling portion 13 of the load supporting cylinder 2 and the upper surface 1a of the load receiving plate 1 in a contact state, but the rolling element 7 does not substantially bear a load. Further, the steel rod damper 10 is unloaded in the fixed position state, but the above-described lifting force can be further increased by adopting an installation state showing resistance with respect to a small forcing force such as a wind load.

(B) During an earthquake (see Figs. 11 and 12)
In the event of an earthquake (and in all cases where a force that causes damage to the building such as excessive wind load is applied), the ground E shakes greatly, and the substructure is subjected to the forced displacement of this earthquake motion. The foundation B as a base vibrates integrally with the ground E, but the superstructure (building) G is oscillated through the rolling action of the rolling elements 7 that form the main body of the seismic isolation support device S, and the superstructure G and the bottom A relative displacement occurs with the structure B.
In the initial motion of this earthquake, the friction (static friction) against the base B surface of the upper structure G is extremely small due to the uplift force that was acting at all times, and the relative movement between the upper structure G and the lower structure B occurs smoothly. This encourages the rolling element 7 to roll. This upward lifting force is lost by the upward movement of the superstructure G.
The rolling element 7 in contact with the upper structure G rolls with the movement of the upper structure G, and then the upper structure G is supported by the rolling element 7 and the upper part supported by the rolling element 7. The structure G follows the rolling locus of the rolling element 7. When the superstructure G moves in the reverse direction, the above operation is reversed.
Accompanying the earthquake motion, the superstructure G follows the rolling trajectory of the rolling element 7 and swings along with the vertical movement, so that the structure G has a swinging action with a large period due to the rolling action of the rolling element 7. As a result, the so-called seismic isolation effect is exhibited by avoiding adverse effects such as the resonance effect caused by the strong ground motion of short period components.

(B-1) For initial motion When there is an initial motion of a large earthquake motion above a certain level, the building, that is, the superstructure G, has a small vertical load on the surface due to the effect of the lifting force at all times, and it is applied over a large area. Therefore, the friction acting on the contact surface H of the upper structure G with the lower structure B is extremely small, and the relative movement between the upper structure G and the lower structure B occurs smoothly and immediately. The rolling action of the rolling element 7 is immediately exerted. In other words, this lifting force acts to promote the rolling movement of the rolling element 7 and smoothly shifts to the following (B-2) and subsequent states. If the upward movement accompanying the rolling of the rolling element 7 breaks the sealing action of the sealing member 3, the effect of this lifting force is lost.
Further, by detecting the initial tremor of the earthquake and taking a means for further increasing the internal pressure of the internal pressure chamber J by this detection signal, the initial operation can be further ensured.

(B-2)
Subsequently, when the upper structure G moves rightward (b) in FIG. 11, the rolling element 7 receives a lateral forcing force (so-called seismic inertial force) from the contact (support point) N on the upper surface. A rotational force is generated, and rotation in the right direction, that is, in the clockwise direction, starts from the contact (support point) M on the lower surface. At this time, the engagement action between the damper steel bar 10 and the upper part of the rolling element 7 also serves as a trigger for rotation.
Due to the rotation, that is, the tilting movement of the rolling element 7, the lower contact M shifts to the right without causing a slip, and at the same time, the upper contact N shifts to the left without causing a slip. The vertical distance from the lower surface, that is, the height of the upper contact increases, and the upper structure G is lifted upward. With this lifting, the filling fluid K in the internal pressure chamber J is dissipated, the uplifting action by the internal pressure chamber J is lost, and the rolling element 7 loads the entire load W of the building. Has a sufficient bearing strength. It should be noted that the couple due to the acting force of the building load W on the support point N and the reaction force from the support point M acts in the direction opposite to the rotation direction of the rolling element 7 and increases with the rotation of the rolling element 7. Although acting as a clockwise restoring force, the influence is small in the early stage of rotation.
Accordingly, the superstructure (building) G moves while being supported by the rolling element 7, follows the rolling locus of the rolling element 7, and swings between the horizontal movement component and the upward movement component. However, this oscillating motion achieves translation and has no inclination. As a result, the superstructure G is subjected to a swinging action with a large period due to the rolling action of the rolling elements 7, and adverse effects such as a resonance action with the earthquake motion can be avoided.
At the same time, the steel rod damper 10 is pulled out from the steel rod damper insertion tube 9b of the load receiving plate 1 and the steel rod damper insertion tube 9c of the load supporting cylinder 2 and is bent, and a damper action is obtained by absorbing energy accompanying the bending deformation. Demonstrate.
When the rolling movement of the rolling element 7 proceeds and comes to the right end, the upper contact N is at the highest position. FIG. 11 shows this state.

(B-3)
When the superstructure G receives a seismic inertia force in the reverse direction and moves to the left (in the direction B in FIG. 12), the above state is reversed.
First, the rolling element 7 starts to rotate in the left direction, that is, counterclockwise from the right end position, but the couple action (or rotational moment) due to the building load acting on the rolling element 7 contributes to this rotation, and the restoring force. Acts as As the rolling element 7 rotates, the lower contact M shifts to the left and the upper contact N also shifts to the right. As the building G moves downward, the two contacts M and N approach the initial position. The steel rod damper 10 is drawn into the steel rod damper insertion tube 9c of the load supporting cylinder 2 and the steel rod damper insertion tube 9b of the load receiving plate 1 and is deformed linearly to exhibit a damper action.
The lower contact M and the upper contact N simultaneously become the initial position, and the rolling element 7 passes through the lowest position (neutral position).
Further, the superstructure G moves to the left in response to the seismic inertia force, and the lower contact M and the upper contact N are shifted to the left and to the right, respectively, and the vertical distance (height) is increased. That is, it conforms to the state (B-2) described above. The steel bar damper 10 is also bent again and exhibits a damper action. The couple effect due to the building load gradually increases, generating a restoring force and counteracts this left displacement.
When the rolling movement of the rolling element 7 proceeds and reaches the left end, the upper contact N is at the highest position. FIG. 12 shows this state.

(B-4)
Along with the earthquake motion, the superstructure G swings, and in response to the swing, the rolling element 7 repeats the operations (B-2) and (B-3) described above.
As a result, the structure has a long period with the rolling action of the rolling elements 7, the harmful resonance phenomenon is avoided, and the desired seismic isolation action is obtained. In this operation, the rolling element 7 exhibits a characteristic that a restoring force is generated by a couple action acting on the upper and lower fulcrums, and a stable state is restored.
On the other hand, the steel rod damper 10 in the seismic isolation support device S is also constantly deformed, exhibits a damping effect due to the deformation energy, and quickly reduces the vibration of the lower structure G.

(B-5)
When the earthquake motion ends and the upper structure G returns to the original position, the inner pressure chamber J is filled with the filling fluid K again. As a result, the seismic isolation structure returns to the function in the fixed position state and prepares for the next earthquake motion.

(C)
The swinging action and the returning action at the time of the vibration are not limited to the seismic motion, but the lifting action works, has a wide sliding support surface between the upper and lower structures, and the seismic isolation support device S is installed. This applies to all vibrations between structures.

(Effect of this seismic isolation structure)
According to the seismic isolation structure of the present embodiment, the building, that is, the upper structure G is always subjected to the lifting force action, the load is apparently reduced, and the base B is supported by the wide support surface H with the foundation, that is, the lower structure B. On the other hand, a large load is not applied, and durability is ensured for a long time with stable support. At the time of an earthquake, the frictional force with the support surface H of the foundation B is extremely small due to the reduction of the apparent load of the building G, and the relative movement between the building G and the foundation B starts immediately due to the forced displacement due to the earthquake motion. Then, the rolling element 7 incorporated in the seismic isolation support device S immediately rolls, and the building G is subjected to a seismic isolation action in which a restoring force follows the rolling locus of the rolling element 7, and the building G Becomes a translational shake and no abnormal stress is generated. In addition, rapid damping is exhibited by the damper mechanism that is linked to the rolling element 7.
And by making the rolling element 7 hold | maintain a predetermined movement space in the seismic isolation support apparatus S, it can cope with all the directions of a horizontal surface.
Furthermore, in the construction of the seismic isolation structure according to the present embodiment, the contact portion of the upper structure G with the foundation B, specifically, the construction of the floor slab portion of the building G or the artificial ground B1 is performed directly on the foundation B. It is carried out by cast-in-place concrete, and does not require any special formwork except for the release agent, and can be constructed economically and easily.

(Other aspects 1)
In the damper mechanism of the above-described embodiment, a mode in which a single rod-shaped damper (steel rod damper) and upper and lower rod-shaped damper insertion pipes through which the rod-shaped damper is inserted is shown, one end is fixed to each of the upper and lower structure. The aspect which consists of two rod-shaped dampers can be taken.
FIG. 13 shows a damper mechanism of one aspect thereof, and the same reference numerals are given to members equivalent to those of the previous embodiment. This damper mechanism comprises steel rod dampers 25 and 26 as two independent rod dampers in the vertical direction. The lower damper rod 25 has a threaded portion 25a at one end and the other end from below the load receiving plate 1. It is inserted into the steel rod damper insertion hole 8a of the rolling element 7 through the steel rod damper insertion hole 8b of the load receiving plate 1, and the packing 28 is held and fixed to the lower end of the load receiving plate 1 at one end side ( In the illustrated example, welding is employed.) The fixing body 29 is screwed into the screw hole and fixed. The upper damper rod 26 also has a threaded portion 26 a at one end, and the other end rolls from above the ceiling wall portion 13 of the load supporting cylinder 2 through the steel rod damper insertion hole 8 c of the load supporting cylinder 2. It is inserted into the steel rod damper insertion hole 8a of the child 7 and is fixed by screwing into the screw hole of the fixing body 31 which is fixed by holding the packing 30 at the upper end of the load supporting cylinder 2 at one end side. .
In this embodiment, as the rolling element 7 rolls, the steel bar dampers 25 and 26 are bent and deformed to absorb the energy of the earthquake motion.

(Other aspect 2)
In the seismic isolation structure of the above embodiment, only the seismic isolation support device S is installed, but in addition to the seismic isolation support device S, an internal pressure chamber device S1 shown in FIG. Can be configured. As shown in FIGS. 9 and 10, the internal pressure chamber device S1 is installed between the upper structure G and the lower structure B together with the seismic isolation support device S.
As shown in FIG. 14, the internal pressure chamber device S <b> 1 can be said to be a seismic isolation support device in which the rolling element 7 is omitted. In the figure, members having the same functions as those of the seismic isolation support device S of the previous embodiment are given the same reference numerals. That is, 1 is a load receiving plate, 2 is a load supporting cylinder, 3 is a sealing member, 4 is a supply pipe, 5 is a discharge pipe, and J is an internal pressure chamber. The load supporting cylinder 2 is integrally installed in the floor slab concrete of the superstructure G to be cast on site. In the illustrated example, the thickness of the load receiving plate 1 and the load support cylinder 2 is made thinner than that of the seismic isolation support device S, but may of course be the same. Furthermore, the load receiving plate 1 can be omitted. The internal pressure chamber device S1 is not particularly limited in volume, but may be smaller than the seismic isolation support device S. Further, the internal pressure chamber device S1 does not have the rolling element 7, and therefore has no damper mechanism.
In the supply pipe 4 and the discharge pipe 5, the filling fluid is supplied to and discharged from the internal pressure chamber J through the piping systems 4a and 4b shown in the previous embodiment. The upper surface 1a of the load receiving plate 1 and the lower surface of the load supporting cylinder 2 have a predetermined gap, and the sealing member 3 keeps the internal pressure chamber J airtight.
Reference numeral 33 denotes an anchor portion attached to the internal pressure chamber device S1 and includes a lower anchor member 34, an upper anchor member 35, and a chain member 36. The lower anchor member 34 passes through the load receiving plate 1 and is fixed to the base B, and the upper anchor member 35 passes through the ceiling portion of the load supporting cylinder 2 and is fixed to the upper structure G, and protrudes into the internal pressure chamber J. Both ends of the chain member 36 are connected to the annular portions of the anchor member 34 and the upper anchor member 35 so as to be loosely inserted. In the example shown in the figure, the chain member 26 has a certain length and can be bent and bent freely. The anchor member 33 can be omitted if necessary.
9 and 10 show the arrangement of the internal pressure chamber device S1. In this arrangement mode, the internal pressure chamber device S1 is arranged in an intermediate portion of each seismic isolation support device S while maintaining symmetry, but is arranged side by side with each seismic isolation support device S or independently of the seismic isolation support device S. The internal pressure chamber device S1 may be arranged in a symmetrical manner in any aspect.

According to the seismic isolation structure in which the internal pressure chamber device S1 is arranged, the lifting force capacity for the upper structure G is further increased, the static friction force for the upper structure G is further reduced, and the seismic isolation for the initial motion of the earthquake is performed. The rolling of the rolling element 7 in the support device S is further smoothed.
The anchor member 33 regulates displacement exceeding the allowable range of the upper structure G with its rigidity in relative movement between the upper structure G and the lower structure B.

  Furthermore, by disposing the internal pressure chamber device S1, it is possible to adopt a mode in which the internal pressure means composed of the sealing means 3, the supply 4 and the discharge pipe 5 is omitted in the seismic isolation support device S. In this aspect, the seismic isolation support device S only needs to satisfy the moving space of the rolling element 7 and the load support conditions of the rolling element 7, and the structure of the seismic isolation support device S can be simplified.

(Second Embodiment)
In the first embodiment, the contact portion of the upper structure G to the lower structure B, specifically, the floor slab portion of the upper structure G is constructed by cast-in-place concrete, but in the second embodiment, The construction aspect by a ready-made member is shown.
FIG. 15 shows one aspect of the seismic isolation structure of the second embodiment, and members equivalent to those of the first embodiment are denoted by the same reference numerals.
In this embodiment, the beam material Ga is stretched between the upper surfaces of the load supporting cylinders 2 of the seismic isolation support devices S arranged side by side, and the floor slab Gb is placed on the upper surface of the beam material Ga. As the beam material Ga, a precast material is adopted, and it is integrated with the upper structure G as a structural material. The beam material Ga is usually a steel material, specifically H-shaped steel, but may be another material, for example, a reinforced concrete beam material. The beam material Ga is rigidly joined to the load support cylinder 2 of the seismic isolation support device S by welding or bolt connection. It is preferable that the pillar material of the structure of the building G is mounted and fixed on the load supporting cylinder 2 of the seismic isolation support device S. The floor slab Gb may be cast in place or precast.
Thus, the bundle F is fixedly fixed to the lower surface of the beam member Ga so as to be orthogonal to each other between the parallel beam members Ga. That is, the bundle F has a structure in which the bundle F is suspended and fixed to the beam material Ga. The bundle F is formed of a rigid body having a large area on the lower surface, whether hollow or solid, and the lower surface Fa of the bundle F abuts on the upper surface Ba of the foundation B in a fixed position. A contact portion between the lower surface Fa of the bundle F and the upper surface Ba of the foundation B constitutes a flat contact portion H.
In addition, this bundle F can also take the aspect attached to the beam material Ga distribute | arranged to the cross (cross) shape.

FIG. 16 shows an example of the arrangement of the seismic isolation support device S and the bundle F in the seismic isolation structure of this embodiment, and the seismic isolation support device S arranged with symmetry between the upper and lower structures G and B. A bundle F is arranged between the beam members Ga spanned between them.
Arrangement according to this is also made on the artificial ground.

(Operation and effect of this embodiment)
In the seismic isolation structure of this embodiment, there is no essential difference from the action of the seismic isolation structure of the first embodiment.
In other words, the reduced load of the upper structure G of the building (or artificial ground) is always transmitted and supported to the lower structure B of the concrete foundation via the plane contact portion H, and the upper structure G and the lower structure B The load of the upper structure G is transmitted to and supported by the lower structure B by receiving the support action of the rolling element 7 of the seismic isolation support device S interposed between them, and the seismic isolation with respect to the earthquake motion by the rolling action of the rolling element 7 Demonstrate the effect.
Each action / operation of the initial motion of the earthquake, the continuation of the earthquake, and the end of the earthquake is the same as that of the first embodiment.
The effect of the seismic isolation structure of this embodiment is not essentially different from the effect of the seismic isolation structure of the previous first embodiment. As a result, workability can be improved.

(Other aspects)
In the second embodiment, it is possible to adopt a mode in which the floor slab Gb is rigidly connected to the beam material Ga and the bundle F is attached to the lower surface of the floor slab Gb.
Also in this embodiment, in addition to the seismic isolation support device S, an internal pressure chamber device S1 can be added. The internal pressure chamber device S1 can take an aspect of being incorporated in the bundle F or an aspect of being attached to another beam material Ga.

The present invention is not limited to the above-described embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included in the technical scope of the present invention.
1) In each of the above-described embodiments, the foundation installed on the ground E as the lower structure B and the building or the artificial ground as the upper structure G supported by the foundation are shown. It includes a lower layer so-called lower plate and an upper layer so-called upper plate structure.
That is, this seismic isolation structure having a seismic isolation support device S between the lower layer (lower plate) and the upper layer (upper plate) is applied on the middle floor in the building, with a two-layer structure on the floor. be able to.
2) Although the seismic isolation mode in all directions is shown in the present embodiment, the seismic isolation mode in one direction (for example, the X direction) is not excluded. In this case, an ellipse is taken in the XZ plane, and the same elliptical cross-sectional shape is taken in the Y direction. Furthermore, by providing a restraining means at the end in the Y direction, displacement only in the X and Z directions is allowed.

  DESCRIPTION OF SYMBOLS S ... Rolling seismic isolation support apparatus, S1 ... Internal pressure chamber apparatus, G ... Upper structure, B ... Lower structure, H ... Plane contact part, 1 ... Load receiving plate, 1a ... Upper surface, 2 ... Load support cylinder, 3 ... Sealing member, 4 ... supply pipe, 5 ... discharge pipe, 7 ... rolling element, 8 ... rod-shaped damper insertion hole, 9 ... rod-shaped damper insertion pipe, 10 ... rod-shaped damper, 12 ... cylindrical side wall portion of the load supporting cylinder 2, DESCRIPTION OF SYMBOLS 13 ... Ceiling wall part of the load support cylinder 2, 13a ... Lower surface, J ... Internal pressure chamber, K ... Filling fluid, M ... Lower contact, N ... Upper contact, Ga ... Beam material, F ... Bundle

Claims (6)

In a structure composed of an upper structure and a lower structure that are independent of each other and can move relative to each other in the horizontal direction,
The upper surface of the lower structure is formed as a flat surface,
Holding a predetermined area in a fixed position and transmitting the load of the upper structure to the lower structure with a flat contact portion;
Between the upper structure and the lower structure, a rolling seismic isolation support device having the following configuration is installed,
A base-isolated structure characterized by that.
a. A rigid load receiving plate whose upper surface forms the same level as the upper surface of the lower structure is fixed to the upper surface of the lower structure,
b. On the lower surface of the upper structure, a rigid load supporting cylinder made of a cylindrical body having a cylindrical internal pressure chamber opened downward is fixed,
c. A sealing member that seals between a facing portion with a smooth surface formed on the upper surface of the load receiving plate is fixedly held at the lower end of the cylindrical side wall portion of the load supporting cylinder,
d. In the internal pressure chamber of the load support cylinder, a rolling element made of a rigid body and having a spheroid shape whose surface curvature gradually changes, takes a minimum height in a fixed position state and has a horizontal movement range, The upper and lower sides are sandwiched between the lower surface of the ceiling wall portion of the load supporting cylinder and the upper surface of the load receiving plate with substantially no load,
e. A filling fluid is sealed in a pressurized state in the internal pressure chamber in a fixed position state,
f. A rod-shaped damper insertion hole is formed along the central axis of the rolling element, and the rod-shaped damper insertion hole of the rolling element is in a fixed position on the load receiving plate and the ceiling wall portion of the load supporting cylinder. The rod-shaped damper insertion pipes having the rod-shaped damper insertion holes on the same straight line are arranged so as to maintain hermeticity. And
g. The rolling element supports the load of the upper structure in a rolling state in a relative movement between the upper structure and the lower structure. 2. The base isolation structure according to claim 1, wherein an internal pressure chamber device having the following configuration is installed between the upper structure and the lower structure in addition to the rolling base isolation support device.
a. On the lower surface of the upper structure, a rigid load supporting cylinder made of a cylindrical body having a cylindrical internal pressure chamber opened downward is fixed,
b. A sealing member that seals between the facing portion of the upper surface of the lower structure and the smooth surface is fixedly held at the lower end of the cylindrical side wall portion of the load supporting cylinder,
c. A filling fluid is sealed in the internal pressure chamber in a pressurized state in a fixed position.   In place of the f-term of claim 1, a rod-shaped damper insertion hole is formed along the center axis of the rolling element, and one end is fixed to the upper and lower part structure while maintaining the solidity, and the other end is the rod-like shape. A base-isolated structure characterized in that a rolling base-isolated support device in which a rod-like damper is inserted into a damper insertion hole is installed between an upper structure and a lower structure. The base isolation structure according to claim 3, wherein an internal pressure chamber device having the following configuration is installed between the upper structure and the lower structure in addition to the rolling base isolation support device.
a. On the lower surface of the upper structure, a rigid load supporting cylinder made of a cylindrical body having a cylindrical internal pressure chamber opened downward is fixed,
b. A sealing member that seals between the facing portion of the upper surface of the lower structure and the smooth surface is fixedly held at the lower end of the cylindrical side wall portion of the load supporting cylinder,
c. A filling fluid is sealed in the internal pressure chamber in a pressurized state in a fixed position.   The seismic isolation structure according to any one of claims 1 to 4, wherein the flat contact portion of the upper structure with respect to the lower structure is cast-in-place concrete placed on the upper surface of the lower structure via a sliding surface.   The flat contact portion of the upper structure with respect to the lower structure is a bottom surface of a bundle suspended below a rigid structure mounted and fixed on a load supporting cylinder of the seismic isolation support device. The seismic isolation structure described in Crab.

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