JP2000240072A - Base isolation device installing method and installation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply no bending to a base isolation device to the utmost by connecting an upper face plate of the base isolation device fixed to a foundation structure and a flange plate fitted to the lower base of a base isolation structure to each other to roll. SOLUTION: When bending deformation is caused in a post 11 of a base isolation structure to apply compressive force and tensile force to a base isolation device 1, a flange plate 4 fitted to a lower base part of the post 11 is caused to rotate, the outer peripheral part of the flange plate 4 causes rolling along the spherical surface or polygonal surface to vary vertically, and twelve discoidal springs 7 are elongated and contracted to follow, thereby absorbing and lightening the vertical displacement, so that excessive additional axial force is not applied to a bolt 6 and bending can be prevented from being transmitted to the base isolation device to the utmost. A dowel 3 is integrally provided in the lower surface of the flange plate 4, and a slit 5 fitted to the dowel 3 is provided in an upper face plate 2 to similarly execute the above. Thus, a natural function of the base isolation device can be permanently maintained so as to realize base isolation and differential settlement measures in an intermediate layer base isolation and the post head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an installation method and an installation structure of a seismic isolation device installed as a seismic isolation means for a so-called seismic isolation structure such as a building, a bridge, a tower, and the like. The present invention relates to an installation method and an installation structure in which a seismic isolation device is not bent as much as possible.

[0002]

2. Description of the Related Art Conventionally, seismic isolation devices installed for the purpose of seismic isolation of so-called seismic isolation structures such as buildings, bridges, towers, etc., are bent by the structures that shake due to seismic force (horizontal force). receive. In the case of a seismic isolation device called a so-called laminated rubber in which a steel sheet and a rubber sheet are alternately laminated and bonded to each other to form a columnar shape, the steel sheet and the rubber sheet are peeled off due to the local tensile force of the rubber sheet caused by bending There is a possibility that the rubber sheet itself may be broken by a local compression force. Further, when a bending is applied to a mechanical seismic isolation device such as a rolling bearing, a large local load is applied to a rolling element or the like, which may cause malfunction.

[0003] Therefore, there is a strong demand for seismic isolation devices (laminated rubber, rolling bearings, etc.) to have a structure that absorbs and alleviates bending deformation of a building that has been subjected to an earthquake as much as possible and does not give excessive bending. Techniques to meet this need include seismic isolation device installation methods and structures, such as strengthening by increasing the diameter of beams, etc. directly connected to the seismic isolation device, or installing slabs above and below the seismic isolation device. There is.

[0004]

[Problems to be Solved by the Invention] However, both of the techniques described in the above are very expensive, seismic isolation at the middle floor of the building (middle-rise seismic isolation), seismic isolation at the capital, or softness. There was a problem that it was very difficult to implement seismic isolation of buildings that could cause uneven settlement in the ground area.

Accordingly, an object of the present invention is to connect the upper face plate and the flange plate of the seismic isolation device with a structure that allows rolling accompanying bending deformation of the seismic isolation structure and absorbs and reduces vertical displacement. An object of the present invention is to provide an installation method and an installation structure of a seismic isolation device that minimizes bending of the seismic isolation device. A further object of the present invention is to achieve seismic isolation in a middle layer, seismic isolation at a capital, or seismic isolation in a building that may cause uneven settlement in a soft ground area, which is economically advantageous. It is an object of the present invention to provide an installation method and an installation structure of a seismic isolation device.

[0006]

According to a first aspect of the present invention, there is provided a method of installing a seismic isolation device according to the present invention. A face plate and a flange plate attached to the lower bottom portion of the seismic isolation structure are connected so as to be rollable by providing fixed points capable of transmitting a horizontal force on each vertical center line, and the upper face plate and the flange plate are connected to each other. A peripheral part is connected to allow rolling associated with bending deformation of the seismic isolation structure.

According to a second aspect of the present invention, there is provided a seismic isolation device mounting structure, wherein a dowel or a dowel hole is provided in a center portion of an upper surface of an upper face plate of the seismic isolation device fixed to a foundation structure. A dowel hole or a dowel that fits into the dowel or the dowel hole of the upper face plate is provided at a center of a lower surface of a flange plate attached to a lower bottom portion of the seismic structure; and the upper face plate and the flange of the seismic isolation device are provided. The plate is fitted with the dowel and the dowel hole so that horizontal force can be transmitted, and at least one surface is formed as a spherical surface or a polygonal surface that allows bending deformation of the seismic isolation structure as rolling. The two peripheral portions are connected by a structure that absorbs and reduces vertical displacement.

According to a third aspect of the present invention, there is provided the seismic isolation device installation structure, wherein the upper face plate and the flange plate of the second aspect are provided with a vertical bolt and a disc spring installed on the bolt. A nut is screwed and connected via an elastic spring such as a coil spring or an elastic body such as rubber.

According to a fourth aspect of the present invention, there is provided an installation structure for a seismic isolation device, wherein the lower surface of the flange plate is formed as a spherical surface or a polygonal surface which gradually expands from the outer periphery toward the center. The upper surface of the upper face plate of the seismic isolation device is formed substantially in a horizontal plane.

[0010]

1 and 2 show an embodiment of an installation method and an installation structure of a seismic isolation device 1 according to the first and second aspects of the present invention. Foundation beam (foundation structure)
The upper surface 2a of the upper face plate 2 of the seismic isolation device 1 which is fixed vertically to 10 is a substantially horizontal plane, and a dowel (shear key) 3 is integrally provided at a substantially central portion thereof. On the other hand, the lower surface 4a of the flange plate 4 as a column base attached to the lower bottom of the column 11 of the seismic isolation structure is formed in a spherical surface or a polygonal surface that allows bending deformation of the column 11 as rolling. A dowel hole 5 that fits into the dowel 3 of the upper face plate 2 is provided. The upper face plate 2 and the flange plate 4 of the seismic isolation device 1 are fitted with the dowels 3 and the dowel holes 5 so that a horizontal force can be transmitted, and the peripheral portions of the dowels 3 and 5 are connected by a structure that absorbs and moderates vertical displacement. (Claim 2).

As means for connecting the upper face plate 2 of the seismic isolation device 1 and the flange plate 4 in a structure for absorbing and mitigating the vertical displacement, the upper face plate 2 and the flange plate 4 are connected.
Is screwed and connected to a nut 8 via a vertical bolt 6 disposed at the periphery thereof and an elastic body 7 such as a disc spring, a coil spring or the like or a rubber or the like provided on the bolt 6 (claim 3). ). In the illustrated example, the upper face plate 2
And a plurality of flange plates 4 arranged in a well-balanced manner along two concentric circles having a center at the center X (FIG. 1) as viewed in plan (six in the inner circle and four in the outer circle in the embodiment). 6
The bolt 6 is passed through the bolt holes of a total of 12 pieces), a disc spring 7 is installed above the bolt 6 on the upper surface of the flange plate 4, and a nut 8 is screwed into the upper and lower ends of the bolt 6 and tightened. Are linked. In addition,
The number and arrangement of the connecting members are not limited to the illustrated example, and any number and arrangement can be used as long as the structure absorbs and moderates vertical displacement between the upper face plate 2 and the flange plate 4. Also, the disc spring 7 can be similarly implemented by being installed on the lower surface of the upper face plate 2 of the seismic isolation device 1. The same can be implemented by using an elastic body such as a coil spring or rubber instead of the disc spring 7.

In the illustrated example, the lower surface 4a of the flange plate 4 has a spherical surface or a bulge gradually expanding from the outer periphery toward the center (the dowel hole 5) as a structure that allows bending deformation of the column 11 of the seismic isolation structure as rolling. The upper face plate 2 is formed in a polygonal surface, and the upper surface 2a of the upper face plate 2 is formed in a substantially horizontal plane (claim 4), but is not limited thereto. The same applies to the case where the upper surface 2a of the upper face plate 2 is formed as a spherical or polygonal surface gradually expanding from the outer periphery toward the center (the dowel 3), and the lower surface 4a of the flange plate 4 is formed as a horizontal surface. The same can be achieved by forming both of them on the spherical surface or polygonal surface as described above.

According to the installation structure of the seismic isolation device 1 configured as described above, when the column 11 of the seismic isolation structure undergoes bending deformation and compressive force acts on the seismic isolation device 1, the flange plate 4 causes rotation, and at this time, the outer peripheral portion of the flange plate 4 rolls in accordance with a spherical or polygonal surface and fluctuates up and down, and the twelve disc springs 7 expand and contract to follow the vertical displacement. In this case, excessive additional axial force does not act on the bolt 6, and the transmission of bending to the seismic isolation device 1 can be prevented as much as possible. On the other hand, when a tensile force acts on the seismic isolation device 1 from the column 11 of the seismic isolation structure due to the bending deformation, the bolt 6 also resists the tension, but when the column 11 is bent at this time, In addition, the transmission and bending of the seismic isolation device 1 can be prevented as much as possible by the expansion and contraction of the twelve disc springs 7 on the same principle as when the compressive force acts.

Therefore, even when a compressive force or a tensile force acts on the seismic isolation device 1 from the column 11 of the seismic isolation structure, excessive bending deformation generated in the column 11 is absorbed and mitigated.
The transmission of bending to the seismic isolation device 1 can be prevented as much as possible. It is to be noted that the same can be achieved by providing the dowel 3 integrally with the lower surface of the flange plate 4 and providing the dowel hole 5 which fits into the dowel 3 in the upper face plate 2. In the illustrated example, the seismic isolation device 1 is implemented by a so-called laminated rubber, but is not limited to this. Further, the foundation beam 10 and the pillar 11 of the seismic isolation structure are not limited to this, and various combinations of so-called structures such as an abutment and a girder can be implemented. That is,
It can also be suitably applied to seismic isolation at the middle floor of a building (middle floor seismic isolation) or seismic isolation at the capital. Incidentally, reference numeral 9 in the drawing denotes a lower face plate of the seismic isolation device 1.

[0015]

According to the method for installing a seismic isolation device and the structure for installing the seismic isolation device according to the present invention, the upper face plate of the seismic isolation device fixed to the foundation structure and the flange attached to the seismic isolation structure A plate is fixed to each vertical center line with a fixed point capable of transmitting horizontal force and connected in a rollable manner, allowing rolling accompanying bending deformation of the seismic isolation structure to absorb and alleviate vertical displacement. As a result, it is possible to absorb and alleviate the bending deformation of the base-isolated structure while maintaining the supporting force of the base-isolated structure, and to prevent the transmission of the bending to the base-isolated device as much as possible. Therefore, the original function of the seismic isolation device can be maintained permanently. Intermediate seismic isolation, seismic isolation at the capital, and differential settlement measures can be easily implemented, making construction simple and economical.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an installation structure of a seismic isolation device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Upper face plate 2a Upper surface of upper face plate 3 Dowel (Shear key) 4 Flange plate 4a Lower surface of flange plate 5 Dowel hole 6 Bolt 7 Belleville spring 8 Nut 9 Lower face plate 10 Foundation beam (foundation structure) 11 pillar

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masafumi Yamamoto 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside the Takenaka Corporation Technical Research Institute (72) Inventor Akira Nishimura 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside Takenaka Corporation Technical Research Institute (72) Inventor Ichiichi Kusakabe 4-1-1-13 Honcho, Chuo-ku, Osaka City Inside Takenaka Corporation, Osaka Main Store (72) Inventor Ichizo Yamane Chuo-ku, Osaka City F-term (reference) in the Osaka head office of Takenaka Corporation, 4-chome 1-113 2D046 DA13 DA14

Claims (4)

[Claims] An upper face plate of a seismic isolation device fixed to a foundation structure and a flange plate attached to a lower bottom portion of the seismic isolation structure are provided with fixed points capable of transmitting a horizontal force on respective vertical center lines. A method of installing a seismic isolation device, characterized in that the seismic isolation device is provided and connected so as to be capable of rolling, and peripheral portions of the upper face plate and the flange plate are connected in a permissible manner with rolling caused by bending deformation of the seismic isolation structure. 2. A dowel or a dowel hole is provided in the center of the upper surface of the upper face plate of the seismic isolation device fixed to the substructure, and the lower center of the flange plate attached to the lower bottom of the seismic isolation structure. A dowel hole or a dowel which fits into the dowel or the dowel hole of the upper face plate is provided; and the upper face plate and the flange plate of the seismic isolation device transmit horizontal force between the dowel and the dowel hole. And at least one of the surfaces is formed as a spherical surface or a polygonal surface that permits bending deformation of the seismic isolation structure as rolling, and the peripheral portions of both are connected by a structure that absorbs and moderates vertical displacement. The installation structure of the seismic isolation device, which is characterized in that: 3. An upper face plate and a flange plate of the seismic isolation device include a vertical bolt and a disc spring mounted on the bolt.
A nut is screwed and connected via an elastic body such as a coil spring or an elastic body such as rubber,
An installation structure for the seismic isolation device according to claim 2. 4. The lower surface of the flange plate is formed as a spherical or polygonal surface gradually expanding from the outer periphery toward the center, and the upper surface of the upper face plate of the seismic isolation device is formed substantially in a horizontal plane. The installation structure of the seismic isolation device according to claim 2 which performs.