JPH11223240A - Setting method and setting structure of base isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a base isolating device from being bent as much as possible by interposing a cushioning material for absorbing and moderating the bending deformation of a structure between the structure and the face plate of the base isolating device to connect the both. SOLUTION: A recessed part 2a is provided upward on the upper face plate 2 of a base isolating device 1 horizontally set on the pedestal 6a of a foundation 6, and a protruding part 5a to be fitted to the recessed part 2a is protruded downward in the connecting position of the foundation beam 5 of a base isolating structure with the base isolating device 1. A highly ductile buffering material 4 such as lead is filled in the recessed part 2a, the recessed part 2a is fitted to the protruding part 5a to ensure a horizontal clearance 7a and a vertical clearance 7b between the both, and a ring seal 8 for sealing the buffering material 4 is installed to the circumferential surface of the protruding part 5a. Thus, the volume of the buffering material 4 is kept constant, and the foundation beam 5 is never settled even by a large loading weight from the foundation beam 5. Since the lead material has a low yield point, however, it is plasticized by the bending moment of the foundation beam 5 to absorb and moderate the bending deformation of the foundation beam 5, so that no excessive bending is imparted to the base isolating device 1.

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 which is installed as a so-called seismic isolation means for a structure such as a building, a bridge or a tower. The present invention relates to an installation method and an installation structure that minimize bending of an apparatus.

[0002]

2. Description of the Related Art Conventionally, seismic isolation devices installed for the purpose of seismic isolation of structures such as buildings, bridges, towers, etc. have been given a bend by a structure that shakes under seismic force. In the case of a seismic isolation device called a so-called laminated rubber in which a donut-shaped steel plate and a rubber sheet are alternately stacked and bonded to each other and stacked in a columnar shape, there is a possibility that the steel plate and the rubber sheet may be separated due to a tensile force caused by bending. is there. Further, in a mechanical seismic isolation device such as a rolling bearing, when a bending is applied, a local load is applied to a rolling element or the like, which may cause a malfunction.
Therefore, there is a strong demand for seismic isolation devices (laminated rubber, rolling bearings, etc.) to have a structure that absorbs and mitigates as much as possible the bending deformation of a building that has been subjected to an earthquake and does not give excessive bending. As a technology that meets this need, a method of installing a seismic isolation device, such as increasing the diameter of a beam or the like that is directly joined to the seismic isolation device, or installing slabs above and below the seismic isolation device, and There is an installation structure.

[0003]

However, the techniques described in the above, however, are very expensive, and require seismic isolation on the middle floor of the building (middle-rise seismic isolation), seismic isolation on the capital, or in soft ground areas. There was a problem that it was very difficult to implement seismic isolation in a building that could cause uneven settlement.

[0004] Accordingly, an object of the present invention is to provide a cushion between a structure and a face plate of the seismic isolation device, which absorbs and moderates the bending deformation of the structure, thereby absorbing the bending deformation of the structure. An object of the present invention is to provide an installation method and an installation structure of a seismic isolation device which is relaxed so as not to bend as much as possible. A further object of the present invention is that it is easy to implement seismic isolation in a building that may cause middle layer seismic isolation, seismic isolation at the capital, or uneven settlement in soft ground areas, and is easy to construct. It is an object of the present invention to provide an economical method of installing a seismic isolation device and an installation structure.

[0005]

According to a first aspect of the present invention, there is provided a method of installing a seismic isolation device, comprising: It is characterized in that it is joined by interposing a cushioning material that absorbs and alleviates bending deformation of the structure.

According to a second aspect of the present invention, there is provided an installation structure of a seismic isolation device, wherein a concave portion or a convex portion is provided on a face plate of the seismic isolation device; The convex portion or the concave portion that fits into the concave portion or the convex portion of the face plate is provided, and the concave portion is filled with a highly ductile cushioning material such as lead or a lead alloy, and the seismic isolation device and the structure are The concave and convex portions with the buffer material interposed are fitted to each other so as to be capable of absorbing and relaxing bending deformation of the structure.

According to a third aspect of the present invention, in the installation structure of the seismic isolation device, a concave portion is provided at a joint portion of the structure with the seismic isolation device, into which a face plate of the seismic isolation device is fitted. The concave portion is filled with a highly ductile cushioning material such as lead or a lead alloy, and the seismic isolation device and the structure absorb and relax the bending deformation of the structure with the cushioning material interposed in the concave portion. Each of which is acceptably joined.

According to a fourth aspect of the present invention, in the installation structure of the seismic isolation device, a ring seal for sealing a cushioning material filled in the concave portion is mounted on an outer peripheral surface of the convex portion. It is characterized by. The installation structure of the seismic isolation device according to the invention described in claim 5 is characterized in that a ring seal that seals the cushioning material filled in the recess is mounted on the outer peripheral surface of the face plate described in claim 3. .

According to a sixth aspect of the present invention, there is provided an installation structure for a seismic isolation device, wherein the structure according to the second or third aspect and the face plate of the seismic isolation device are joined by bolts that resist pulling out. Features.

[0010]

Embodiments and examples of the present invention will be described below with reference to the drawings. FIG.
And an example of an installation method and an installation structure of the seismic isolation device 1 described in claim 2. The seismic isolation device 1 installed substantially horizontally on a pedestal 6 a for mounting the seismic isolation device provided on the foundation 6 has a concave portion 2 a facing upward on an upper face plate 2. At the joint of the base beam 5 of the seismic isolation structure with the seismic isolation device 1, a convex portion 5 a having a shape and size that fits closely to the concave portion 2 a of the upper face plate 2 is projected downward. . The recess 2a of the upper face plate 2 is filled with a highly ductile cushioning material 4 such as lead or a lead alloy, and the seismic isolation device 1 and the foundation beam 5 The concave portion 2a and the convex portion 5a of the foundation beam 5 are fitted together, and are joined so as to be able to absorb and alleviate the bending deformation of the foundation beam 5. That is, when the concave portion 2a and the convex portion 5a are fitted to each other, the projecting portion 5a of the basic beam 5 is provided so as to secure a slight horizontal gap 7a and a vertical gap 7b between the basic beam 5 and the upper face plate 2. The design and adjustment of the height and the outer diameter, the depth and the inner diameter of the concave portion 2a of the upper face plate 2, and the thickness of the cushioning material 4 to be filled are achieved. A ring seal 8 for sealing the cushioning material 4 filled in the concave portion 2a of the upper face plate 2 is mounted on the outer peripheral surface of the convex portion 5a of the foundation beam 5.

Although the seismic isolation device 1 is implemented by a so-called laminated rubber in the illustrated example, it is not limited to this. Further, the foundation beam 5 and the pedestal 6 joined to the upper and lower portions of the seismic isolation device 1 are not limited thereto, and various combinations of so-called structures, such as columns and beams, abutments and girders, can be implemented. That is, seismic isolation at the middle floor of the building (middle-rise seismic isolation), seismic isolation at the capital, etc. can be suitably performed. Incidentally, the same technical idea is applied to the embodiments described below.

According to the installation structure of the seismic isolation device 1 configured as described above, since the cushioning member 4 is in a sealed state,
Since the volume of the cushioning member 4 is always kept constant by being sealed by the ring seal 8, even if a large load is applied from the foundation beam 5, the foundation beam 5 is supported without sinking. But,
Since the so-called lead material used as the cushioning material 4 has a low yield point, it is plasticized immediately after the bending moment of the foundation beam 5 acts and flows in a sealed state. Low resistance to bending deformation, absorbs and moderates the bending deformation. As a result, no excessive bending is applied to the seismic isolation device 1. Of course, similar effects can be expected in seismic isolation at the middle floor of the building (middle-rise seismic isolation) or seismic isolation at the capital.

When the compressive force from the foundation beam 5 is not so large and the elastic deformation of the cushioning member 4 can sufficiently absorb the bending deformation of the foundation beam 5, the cushioning member 4 does not need to be in a sealed state. The seal 8 is unnecessary. When resistance to the tensile or shearing force acting on the seismic isolation structure is required, as shown by the chain line, the bolt 10 that resists pulling out the foundation beam 5 and the upper face plate 2 of the seismic isolation device 1 is used. Join.

FIG. 2 shows an example of an installation method and an installation structure of the seismic isolation device 1 according to the first and third aspects. The main feature is that a recess is provided in the foundation beam of the seismic isolation structure, and the face plate of the seismic isolation device is directly fitted and joined to the recess. Hereinafter, a specific description will be given. The seismic isolation device 1 is installed substantially horizontally on a pedestal 6 a for mounting the seismic isolation device provided on the foundation 6. At the joint of the base beam 5 of the seismic isolation structure and the seismic isolation device 1, a concave portion 5 b having a shape and depth into which the upper face plate 2 of the seismic isolation device 1 is closely fitted is provided downward. The concave portion 5b is filled with a highly ductile cushioning material 4 such as lead or a lead alloy. The seismic isolation device 1 and the foundation beam 5 are provided with the cushioning material 4 interposed in the concave portion 5b. Are joined so as to allow absorption and relaxation of bending deformation. That is, when the upper face plate 2 is fitted into the concave portion 5b, a slight vertical gap 7b is formed between the foundation beam 5 and the upper face plate 2.
Depth and inner diameter of the recess 5b of the foundation beam 5,
The outer diameter of the upper face plate 2 and the thickness of the cushioning material 4 to be filled are designed and adjusted. A ring seal 8 is mounted on the outer peripheral surface of the upper face plate 2 of the seismic isolation device 1 to seal the cushioning material 4 filled in the recess 5b of the foundation beam 5.

The installation structure of the seismic isolation device 1 configured as described above can be expected to have the same operation and effect as the installation structure described with reference to FIG. Of course, if the compressive force from the foundation beam 5 is not so large and the elastic deformation of the cushioning material 4 can sufficiently absorb the bending deformation of the foundation beam 5, it is not necessary to make the cushioning material 4 hermetically sealed, and the ring seal 8 Not required. When resistance to the tensile or shearing force acting on the seismic isolation structure is required, as shown by the chain line, the bolt 10 that resists pulling out the foundation beam 5 and the upper face plate 2 of the seismic isolation device 1 is used. It is also possible to penetrate and join the cushioning material 4.

As another embodiment, as shown in FIG. 3, contrary to the embodiment shown in FIG. 1, a convex portion 2b is provided on the upper face plate 2 of the seismic isolation device 1, and a concave portion is formed on the foundation beam 5. 5b may be provided and the same effect can be expected. Further, as shown in FIGS. 4, 5 and 6, it is also possible to carry out the configuration in which FIGS. 1, 2 and 3 are respectively turned upside down. In this case, the same applies. An effect can be expected. Furthermore, as shown in FIG. 7, the present invention can also be implemented by interposing cushioning materials 4 on both sides between the structures 9, 9 and the face plates 2, 3 of the seismic isolation device 1.

[0017]

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 bending deformation of the building frame is absorbed and mitigated between the structure and the face plate of the seismic isolation device. Since the damping material is interposed, the bending deformation of the structure is absorbed and mitigated while maintaining the supporting force of the building frame, and the seismic isolation device is not bent as much as possible. Therefore, the original function of the seismic isolation device can be maintained permanently.

In addition, since it can be implemented simply by interposing a cushioning material between the building frame and the seismic isolation device, seismic isolation in the middle layer, seismic isolation at the capital, uneven settlement countermeasures, etc. can be easily realized, and construction is simplified. It is highly economical.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a different embodiment of the installation structure of the seismic isolation device according to the present invention.

FIG. 3 is a front view showing another embodiment of the installation structure of the seismic isolation device according to the present invention.

FIG. 4 is a front view showing a different embodiment of the installation structure of the seismic isolation device according to the present invention.

FIG. 5 is a front view showing a different embodiment of the installation structure of the seismic isolation device according to the present invention.

FIG. 6 is a front view showing another embodiment of the installation structure of the seismic isolation device according to the present invention.

FIG. 7 is a front view showing a different embodiment of the installation structure of the seismic isolation device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 seismic isolation device 2 upper face plate 2a recess of upper face plate 2b protrusion of upper face plate 3 lower face plate 4 cushioning material 5 foundation beam (structure) 5a projection of foundation beam (structure) 5b recess of foundation beam (structure) 6 Pedestal (structure) 7a Horizontal gap 7b Vertical gap 8 Ring seal 9 Structure 10 Bolt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiichi Kusakabe 4-1-1-13 Honcho, Chuo-ku, Osaka-shi Inside Takenaka Corporation (72) Inventor Ichizo Yamane 4-1-1-13 Honcho, Chuo-ku, Osaka-shi No. Takenaka Corporation (72) Inventor Masafumi Yamamoto 1-5-1, Otsuka, Inzai City, Chiba Pref.

Claims (6)

[Claims] 1. A method of installing a seismic isolation device, comprising: joining a structure and a face plate of the seismic isolation device with a cushioning material absorbing and mitigating bending deformation of the structure interposed therebetween. 2. A concave or convex portion is provided on a face plate of a seismic isolation device, and a convex or concave portion fitted to the concave or convex portion of the face plate is provided at a joint portion of the structure with the seismic isolation device. Being provided, the concave portion is filled with a highly ductile buffer material such as lead or lead alloy, and the seismic isolation device and the structure are fitted with the concave portion and the convex portion with the buffer material interposed. The installation structure of the seismic isolation device, which is jointed so that absorption and mitigation of bending deformation of the structure can be permitted. 3. A concave portion for fitting a face plate of the seismic isolation device is provided at a joint portion of the structure with the seismic isolation device, and a highly ductile cushioning material such as lead or lead alloy is provided in the concave portion. The seismic isolation device is characterized in that it is filled, and the seismic isolation device and the structure are joined to the structure so as to allow absorption and mitigation of bending deformation of the structure after being interposed in the recess. Installation structure. 4. The installation structure of a seismic isolation device according to claim 2, wherein a ring seal for sealing the cushioning material filled in the concave portion is mounted on an outer peripheral surface of the convex portion. 5. The installation structure of a seismic isolation device according to claim 3, wherein a ring seal for sealing the cushioning material filled in the concave portion is mounted on an outer peripheral surface of the face plate. 6. The installation structure of the seismic isolation device according to claim 2, wherein the structure and the face plate of the seismic isolation device are joined by bolts that resist pulling out.