JPH08246705A - Base isolation device of building and base isolation construction method - Google Patents

Abstract

PURPOSE: To provide a base isolation device which has a simple structure and is efficient and inexpensive by supporting a column by a receive base which is provided on a foundation and suspends a support ring by a steel bar and absorbing horizontal vibration by the receive base. CONSTITUTION: A column 1 is supported on a receive base 5 which suspends a support ring 9 by a steel bar 6 in its inside through a solid steel column 7 provided at its tip. In this case, a clearance is provided among the steel bar 7, the support ring 9, and the receive base 5. In addition, it is possible to increase damping effect by providing a damper in the clearance, crossing the steel bars 6, and filling viscous fluid in the receive base 5. When a foundation 3 vibrates in the horizontal direction due to earthquake, the support ring 9 oscillates like a swing, and force in the reverse direction acts on an upper end and a lower end of the steel bar 6 to block excitation force from the foundation 3. When excitation force disappears, the support ring 9 is restored to the center. Consequently, it is possible to reduce the height of a base isolation device and make maintenance unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for isolating buildings and structures from ground vibration caused by an earthquake.

[0002]

2. Description of the Related Art As a seismic isolation device for a building or the like, a device in which a seismic isolation layer of laminated rubber corresponding to about one layer of a building is provided between a plurality of locations between foundations of a building is disclosed in, for example, Japanese Patent Laid-Open No. 6-660.
Known by No. 45.

The seismic isolation layer is formed by stacking rubber sandwiched between steel plates over a plurality of layers. The seismic isolation layer causes internal displacement with respect to horizontal vibration of the ground due to an earthquake and reduces the response acceleration level. By doing so, the vibration of the upper structure is prevented or suppressed.

[0004]

However, in the case of this seismic isolation device, there is a problem that the cost is extremely high since a large amount of expensive laminated rubber is used and a large space is required for disposing the device.

Further, since the rubber undergoes a large deformation during the earthquake to cause displacement between the seismic isolation layers, the seismic isolation layer does not completely return to its original shape after the earthquake, and so-called residual deformation cannot be avoided. In order to prevent such functional deterioration due to residual deformation and rubber material deterioration, this seismic isolation device requires careful maintenance. However, if the space for such maintenance is secured in addition to the space occupied by the seismic isolation layer itself, the space available for the original purpose of the building will be further reduced.

The present invention has been made to solve the above-mentioned problems, requires no maintenance, requires a small installation space,
The purpose is to realize an inexpensive seismic isolation device and seismic isolation construction method.

[0007]

The invention according to claim 1 is interposed between a support base composed of a foundation or ground and a structure above it to prevent transmission of horizontal vibration of the support base to the structure. In a seismic isolation device for a structure, a base-side support member supported by a support base, a steel rod that is connected to the support member and projects toward the base, and the structure that is connected to a protruding portion of the steel rod And a structure-side support member that supports the.

According to a second aspect of the present invention, in the first aspect of the present invention, the base-side support member is composed of a tubular member having a small-diameter opening at the upper end, and the structure-side support member is provided at the lower end with a large-diameter portion. The columnar member comprises a columnar member provided therein, the columnar member is inserted from the opening into the inside of the base-side support member, and a plurality of steel rods are coupled to the wall surface of the cylindrical member around the opening to form the inside of the tubular member. And is connected to the large diameter portion of the columnar member.

According to a third aspect of the invention, in the second aspect of the invention, the steel rod is penetrated through the large diameter portion of the columnar member and the wall surface around the opening of the tubular member with a slight clearance, respectively.
A nut is screwed into each of the penetrating ends.

According to a fourth aspect of the invention, in the third aspect of the invention, a damper is interposed between the columnar member and the wall surface around the opening.

According to a fifth aspect of the invention, in the third aspect of the invention, a damper is interposed between the large diameter portion and the inner peripheral surface of the tubular member.

According to a sixth aspect of the invention, in the third aspect of the invention, the fluid is stored inside the tubular member.

According to a seventh aspect of the present invention, in the third aspect of the present invention, a rod-shaped damping member composed of an assembly of a plurality of thin steel rods is provided in parallel with the steel rod, and the large diameter portion of the columnar member and the opening of the tubular member are opened. It is arranged between the wall surface around the part.

According to the invention of claim 8, in the invention of claim 2, the steel rod is rigidly coupled to the large diameter portion and the wall surface around the opening of the tubular member, respectively.

According to a ninth aspect of the present invention, in the second aspect of the invention, the steel rods are arranged in parallel around the columnar member at equal intervals.

According to a tenth aspect of the invention, in the second aspect of the invention, the steel rods are arranged so as to intersect around the columnar member.

According to an eleventh aspect of the present invention, in the second aspect of the present invention, each steel rod is constituted by an assembly of a plurality of bundled thin steel rods.

According to a twelfth aspect of the invention, a plurality of the seismic isolation devices according to the first aspect of the invention are arranged at a predetermined interval between the structure and the supporting base to support the structure.

[0019]

According to the invention of claim 1, since the structure-side support member is supported through the steel rod projecting from the base-side support member in the direction of the base, the steel rod swings or displaces with respect to horizontal vibration of the support base. Bending deforms to isolate the structure from vibration.

According to the second aspect of the present invention, since the columnar member inserted inside the tubular member is supported by the plurality of steel rods arranged around it, the columnar member can be stably supported. It is possible to realize a seismic isolation structure using steel rods with a small device.

According to the third aspect of the invention, since the clearance is provided at the steel rod connecting portion, the steel rod is supported so that it can swing freely, and horizontal vibration can be completely cut off.

According to the fourth aspect of the invention, since the damper is interposed between the columnar member and the opening, it is possible to obtain the action of damping the relative vibration of the support base and the structure.

According to the fifth aspect of the invention, since the damper is interposed between the large diameter portion and the inner peripheral surface of the tubular member, it is possible to obtain the action of damping the relative vibration of the support base and the structure.

According to the sixth aspect of the invention, since the fluid is stored inside the tubular member, an effect of damping relative vibration between the support base and the structure can be obtained.

According to a seventh aspect of the invention, the horizontal relative vibration of the supporting base and the structure of the rod-shaped member is caused by the frictional resistance generated between the thin-diameter steel rods when the rod-shaped member composed of an assembly of a plurality of small-diameter steel rods is deformed. To decay. Therefore, the horizontal vibration is blocked by the steel rod and the horizontal vibration is damped by the rod-shaped member at the same time, and a good seismic isolation action is obtained.

Since the steel rod is rigidly connected to the cylindrical member and the columnar member, the relative displacement of these members is performed solely depending on the bending deformation of the steel rod and the supporting base and A large damping force can be generated against relative vibration of the structure.

According to the ninth aspect of the invention, since the steel rods are arranged in parallel around the columnar member at equal intervals, the seismic isolation device can be simply constructed.

According to the tenth aspect of the invention, since the steel rods are arranged so as to cross the periphery of the columnar member, the swinging range of the large diameter portion and the generated damping force can be variously changed according to the inclination angle of the steel rods. it can.

According to the eleventh aspect of the present invention, since the steel rod is composed of an assembly of a plurality of small diameter steel rods bound together, the supporting base and the structure are caused by frictional resistance generated between the small diameter steel rods when the steel rods are deformed. The relative vibration of can be efficiently damped.

According to the twelfth aspect of the invention, a plurality of the seismic isolation devices of the first aspect are arranged at a predetermined interval between the structure and the supporting base to support the structure, so that the seismic isolation efficiency can be reduced in a small space. A high structure support structure can be realized.

[0031]

1 and 2 show a first embodiment of the present invention.

In FIG. 1, 1 is a pillar of a building which is a structure, 2 is a beam of a building, 3 is a foundation of a building made of concrete cast-in-place piles, and 4 is a ground around the foundation 3.

The seismic isolation device is provided between the lower end of the pillar 1 and the pile head of the foundation 3.

The seismic isolation device is a pedestal 5 as a base side supporting member fixed to the pile head of the foundation 3, a large number of steel rods 6 having one end fixed to the pedestal 5, and the pedestal 5 by the steel rods 6. The solid steel column 7 is provided as a structure-side support member suspended from the.

The pedestal 5 is a bottomed tubular member made of cast iron or reinforced concrete, and has an opening 5A with a reduced diameter at the upper end of the body 5B. The bottom 5C of the pedestal 5 is fixed to the reinforcing bar of the pile head (not shown) of the pile foundation 3 by welding or the like so as not to be displaced from the pile head against the action of the horizontal vibration force.

Screws are formed on both ends of the steel rod 6, and the upper end of the steel rod 6 penetrates the wall surface around the opening 5A of the pedestal 5, and is engaged with the upper end of the pedestal 5 by a nut 8 screwed to the penetrating end. Be stopped. The diameter of the through hole of the steel rod 6 formed on the wall surface of the cradle 5 is set so as to have a slight clearance with respect to the outer diameter of the steel rod 6.

The solid steel column 7 is a columnar member having a large diameter support ring 9 formed at the lower end and a large diameter support surface 7A formed at the upper end.

The lower end of the steel rod 6 penetrates the support ring 9, and the support ring 9 is supported by a nut 10 screwed to the penetration end. These through holes of the support ring 9 are also formed so as to have a slight clearance with respect to the outer diameter of the steel rod 6. Further, the diameter of the support ring 9 itself is also set so that a predetermined space can be secured with respect to the wall surface of the surrounding pedestal 5.

Such steel rods 6 are arranged around the solid steel columns 7 in a concentric circle with the solid steel columns 7 at equal angular intervals as shown in FIG. Support it in the state of being lifted to the position. Further, the solid steel column 7 supports the column 1 upward by the supporting surface 7A at the upper end.

In this way, the pillar 1 has the pedestal 5 and the steel rod 6
It is supported in a state of being lifted from the ground 4 by the solid steel pillars 7 suspended by. A large number of seismic isolation devices of the same structure are arranged at predetermined intervals on the lower side of the building, and the entire building is supported in a state of being lifted from the ground 4.

The seismic isolation device is carried into the construction site of the building with the pedestal 5, the steel rod 6, and the solid steel column 7 assembled in advance, and after fixing the pedestal 4 to the pile foundation 3, the building The pillar 1 and the beam 2 are constructed on the support surface 7A of each seismic isolation device.

Next, the operation will be described.

When the pedestal 5 fixed to the pile foundation 3 vibrates in the horizontal direction due to an earthquake, the upper end of the steel rod 6 connected to the pedestal 5, which is the support member on the base side, and the support member on the structure side. A horizontally opposite force acts on the lower end of the steel rod 6 connected to a certain solid steel column 7 via a support ring 9. However, since the steel rod 6 penetrates through the through holes of the pedestal 5 and the support ring 9 with a slight clearance, each steel rod 6 is supported by the force applied to the upper and lower ends in the opposite direction in the horizontal direction. While swinging, swinging like a swing, pillar 1
The structure including the beam 2 and the beam 2 is horizontally displaced relative to the support base composed of the foundation 3 and the ground 4. The swinging force of the steel rod 7 completely shuts off the vibration force generated by the support base,
It is not transmitted to the superstructure including the pillar 1 and the beam 2.

When the support ring 9 supported in a swing shape disappears, the pendulum stabilizing action due to gravity returns to the center of the body 5B of the pedestal 5 without any residual deformation. The permissible swing displacement amount of the support ring 6 is determined by the diameter of the pedestal 5, the length of the steel rod, the diameter of the through hole formed in the pedestal 5 and the support ring 9, etc. Even if the height is not increased, it is possible to secure a large swing room for the support ring 9. Therefore, the height of the seismic isolation device can be suppressed to a low level, and since maintenance is not required, it is not necessary to secure a maintenance space.

FIG. 3 shows a second embodiment of the present invention.

Here, the damper 1 is provided between the edge of the opening 5A and the solid steel column 7 and between the support ring 9 and the wall surface of the body 5B.
Interpose 1. The damper 11 may be of any structure having a recoverable structure that elastically deforms under a predetermined resistance, and rubber, metal or the like can be used.

In the first embodiment, the support ring 9 oscillates for a while due to the inertial force even after the vibration force due to the earthquake has subsided. However, by providing the damper 11 in this way, the support ring 9 oscillates. A damping force against the movement is generated, and the swing of the support ring 9, that is, the relative vibration between the structure and the support base can be stopped early.

FIG. 4 shows a third embodiment of the present invention, in which a liquid is injected inside the pedestal 5 of the seismic isolation device constructed in the same manner as the first embodiment. In this case,
A damping force with respect to the swing displacement of the support ring 9 is generated according to the viscosity of the liquid.

5 to 7 show a fourth embodiment of the present invention.

In the first to third embodiments, all the steel rods 6 are arranged concentrically in parallel with the solid steel columns 7. However, in this embodiment, the adjacent steel rods 6 are arranged adjacent to each other. Arranged to intersect. As shown in FIG. 6, the engaging portions of the upper end of the steel rod 6 to the pedestal 5 are alternately positioned on the double concentric circles, and the engaging portion of the lower end of the steel rod 6 to the support ring 9 is shown in FIG. Located above a single circle as shown.

Further, the through holes of the steel rod 6 formed in the cradle 5 and the support ring 9 eliminate the play with respect to the steel rod 6, and the steel rod 6 is structured so that the rocking is restricted by the respective through holes.

In this case, since the swing of the support ring 9 is performed depending on the bending deformation of the steel rod, a stronger damping force is generated as compared with the first to third embodiments. The swingable range of the support ring 9 and the generated damping force vary depending on the length and material of the steel rod 6 and the inclination angle.

FIG. 8 shows a fifth embodiment of the present invention.

Here, the upper end and the lower end of the steel rod 6 are fastened to the pedestal 5 and the support ring 9 by double nuts 8a and 8b and 10a and 10b, respectively. In this case, the upper and lower ends of the steel rod 6 are more rigidly supported, and a larger damping force can be obtained as compared with the other embodiments.

9 and 10 show a sixth embodiment of the present invention. Here, the steel rod 6 is composed of an assembly of a plurality of small diameter steel rods 13, and these are bundled by a binding ring 12 as shown in FIG. Also in this embodiment, the swing displacement of the support ring 9 depends on the bending deformation of the steel rod 6, but at the same time, the small-diameter steel rods 13 forming the steel rod 6 are displaced from each other and frictional resistance generated at that time causes frictional resistance. A damping force with respect to the swing of the support ring 9 is generated. The swingable range of the support ring 9 and the generated damping force can be changed by the pitch of the binding ring 12 and the binding force.

FIG. 11 shows a seventh embodiment of the present invention.
Here, a rod-shaped damping member 14 composed of an assembly of small-diameter steel rods 13 is arranged in parallel with the steel rods 6. The steel rods 6 and the rod-shaped damping members 14 are arranged alternately, for example, but their arrangement ratio can be arbitrarily changed according to the load conditions and the like.

As described above, by providing the steel rod 6 and the rod-shaped damping member 14, the steel rod 6 supports the vertical load and blocks the horizontal vibration, while the rod-shaped damping member 14 serves as the small-diameter steel rod 1.
Since the horizontal vibration is damped by the frictional resistance of 3, a preferable seismic isolation action is obtained. In addition, the steel rod 6 is used as a vibration damping member.
Separation with the above improves the safety of building support and the degree of freedom in designing seismic isolation devices.

The rod-shaped damping member 14 may be bound by the binding ring 12 used in the sixth embodiment.

Although each of the above-described embodiments is intended to block the vibration force exerted by the support base on the structure due to an earthquake, the present invention is not limited to blocking the vibration force at the time of an earthquake.
It is also effective as a support structure for a vibrating body for the purpose of blocking the transmission of vibration on the structure side to the support base.

[0060]

As described above, according to the invention of claim 1,
Since the steel rod protruding from the base-side support member toward the base swings or bends to block the structure from horizontal vibration of the base, a simple structure and an efficient seismic isolation structure can be realized.

According to the second aspect of the present invention, the columnar member inserted inside the tubular member is supported by the plurality of steel rods arranged around the columnar member. Therefore, the seismic isolation structure using the steel rods is structurally stable. It can be realized with a small device.

According to the third aspect of the invention, vibration isolation is improved by the plurality of steel rods supported so as to freely swing.

According to the fourth aspect of the present invention, the damper interposed between the columnar member and the opening damps the relative vibration of the support base and the structure at an early stage, and the vibration absorbing capacity of the seismic isolation device is improved.

According to the fifth aspect of the present invention, the damper interposed between the large diameter portion and the inner peripheral surface of the tubular member quickly damps the relative vibration of the support base and the structure, thereby vibrating the seismic isolation device. The absorption capacity of is improved.

According to the sixth aspect of the invention, the fluid stored inside the tubular member damps the relative vibration of the support base and the structure according to the viscosity, so that a damping force can be easily generated.

According to the invention of claim 7, the steel rod blocks horizontal vibration, while the rod-shaped damping member damps horizontal vibration, so that a high seismic isolation effect can be obtained. Further, since the member for damping vibration is separated from the steel rod, it is possible to improve the safety of supporting the structure and the degree of freedom in designing the seismic isolation device.

According to the invention of claim 8, a high vibration damping capacity can be obtained by bending deformation of the steel rod rigidly coupled to the cylindrical member and the columnar member.

According to the ninth aspect of the present invention, the structure of the seismic isolation device can be simplified by disposing the steel rods in parallel around the columnar member at equal intervals.

According to the tenth aspect of the present invention, the allowable range of relative vibration between the support base and the seismic isolation device and the generated damping force are varied by changing the inclination angle of the steel rods arranged so as to intersect around the columnar member. Can be changed.

According to the eleventh aspect of the present invention, since a plurality of small diameter steel rods obtained by binding the steel rods are displaced from each other with respect to vibration, a high vibration damping capability due to frictional resistance can be obtained.

According to the invention of claim 12, a plurality of seismic isolation devices according to claim 1 are arranged between the structure and the supporting base at a predetermined interval, so that the seismic isolation device can be arranged and maintained. The space is greatly reduced, and a support structure with high seismic isolation efficiency can be realized at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a seismic isolation device showing a first embodiment of the present invention.

FIG. 2 is a view on arrow AA in FIG.

FIG. 3 is a vertical sectional view of a seismic isolation device showing a second embodiment of the present invention.

FIG. 4 is a vertical sectional view of a seismic isolation device showing a third embodiment of the present invention.

FIG. 5 is a vertical sectional view of a seismic isolation device showing a fourth embodiment of the present invention.

FIG. 6 is a view taken along the line BB in FIG.

FIG. 7 is a view taken along the line C-C in FIG.

FIG. 8 is a vertical sectional view of a seismic isolation device showing a fifth embodiment of the present invention.

FIG. 9 is a vertical sectional view of a seismic isolation device showing a sixth embodiment of the present invention.

FIG. 10 is a transverse cross-sectional view of the small diameter steel rod binding portion of the same.

FIG. 11 is a vertical sectional view of a seismic isolation device showing a seventh embodiment of the present invention.

[Explanation of symbols]

 1 column 3 foundation 5 cradle 5A opening 6 steel rod 7 solid steel column 8, 10 nut 9 support ring 11 damper 12 binding ring 13 thin steel rod 14 rod-shaped damping member

Claims (12)

[Claims] 1. A seismic isolation device for a structure, which is interposed between a support base composed of a foundation or ground and a structure above it to prevent horizontal vibration of the support base from being transmitted to the structure. A support member supported on the base, a steel rod connected to the support member to project toward the base, and a structure support member connected to the protruding portion of the steel rod to support the structure. A seismic isolation device for structures. 2. The base-side support member is composed of a tubular member having a small-diameter opening at the upper end, and the structure-side support member is composed of a columnar member having a large-diameter portion at the lower end. Is inserted into the inside of the base-side support member from the opening, and the plurality of steel rods are coupled to the wall surface of the tubular member around the opening to project inside the tubular member, and The seismic isolation device for a structure according to claim 1, which is connected to a diameter portion. 3. The steel rod according to claim 2, wherein the steel rod is passed through the large-diameter portion of the columnar member and the wall surface around the opening of the tubular member with a slight clearance, and nuts are screwed into the penetrating ends. Seismic isolation device. 4. The seismic isolation device according to claim 3, wherein a damper is interposed between the columnar member and the opening. 5. The seismic isolation device according to claim 3, wherein a damper is provided between the large diameter portion and the inner peripheral surface of the tubular member. 6. The seismic isolation device according to claim 3, wherein the fluid is stored inside the tubular member. 7. A bar-shaped damping member composed of an assembly of a plurality of thin steel rods is arranged in parallel with the steel rod between the large diameter portion of the columnar member and the wall surface around the opening of the tubular member. The seismic isolation device according to Item 3. 8. The seismic isolation device according to claim 2, wherein the steel rod is rigidly coupled to the large diameter portion and the wall surface around the opening of the tubular member, respectively. 9. The seismic isolation device according to claim 2, wherein the steel rods are arranged in parallel around the columnar member at equal intervals. 10. The seismic isolation device according to claim 2, wherein the steel rods are arranged so as to intersect around a columnar member. 11. The seismic isolation device according to claim 2, wherein each of the steel rods is composed of an assembly of a plurality of thin steel rods bound together. 12. A seismic isolation construction method for a structure, wherein a plurality of the seismic isolation devices according to claim 1 are arranged at a predetermined interval between a structure and a support base to support the structure.