JPH11280296A - Sliding base isolating structure and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding base isolating structure which is easy to fabricate and advantageous in terms of cost. SOLUTION: A sliding base isolator 10 and a rubber pad body 20 are interposed in series between a foundation side footing 1 and a building side footing 2 which are vertically opposite to each other. The non-integrated rubber pad body 20 in which a rubber sheet and a steel plate are not vulcanization bonded together is used, and by setting the friction coefficient between the rubber sheet and the steel plate to be greater than the friction coefficient between a sliding material 11 and a sliding mating material 12, the rubber pad 20 can be made to exhibit similar base isolating effects to those of vulcanization integrated moldings of the prior art. In construction work, the rubber sheet and the steel plate subjected to the required rustproofing process can be laid one on the other at a construction site.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding seismic isolation structure and a construction method thereof, and more particularly to a sliding seismic isolation device and a rubber pad (laminated rubber having a relatively low height) connected in series (vertical) between a lower structure and an upper structure. And a method of constructing the seismic isolation structure.

[0002]

2. Description of the Related Art A sliding seismic isolation device has a sliding member such as a Teflon plate on one of a lower structure and an upper structure such as a foundation side footing and a building side footing opposed to each other, and a sliding partner material such as a stainless steel plate on the other side. Are installed to slide between the sliding material and the sliding partner during an earthquake, and a horizontal restoring force such as a laminated rubber bearing or a coil spring is separately provided. In addition, a design in which rubber pads are added in series to the sliding material of the sliding seismic isolation device is generally adopted, and the rubber pad imparts initial rigidity to the sliding seismic isolation device and exerts the seismic isolation effect from a small vibration level. At the same time, the response characteristics of the upper structure can be improved.

Conventionally, as the rubber pad, a rubber sheet and a steel sheet are alternately overlapped and then subjected to a vulcanization step (compression and heating), whereby the rubber sheet and the steel sheet are vulcanized and integrally molded. Goods were used.

[0004]

However, the vulcanization step requires a dedicated mold, a compression heater, and the like, so that the production cost of the rubber pad increases, and the vulcanization step requires only 8 hours or less. There is a problem that it takes about one day and it takes a long time to manufacture.

Further, the rubber pad to be superimposed on the sliding seismic isolation device is designed to have a shear resistance of 100 to 200% because the sliding material and the mating material always slide before a large deformation of, for example, 200% or more in shear strain. In spite of being able to cope with any major earthquake, the conventional product was designed to not break to a shear strain of about 400% and was clearly overspecified, which also increased the cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sliding seismic isolation structure which is easy to manufacture and advantageous in cost, and a method of constructing the same.

[0007]

According to the present invention, there is provided a seismic isolation structure in which a sliding seismic isolation device and a rubber pad body are interposed in series between a lower structure and an upper structure. The rubber pad body is characterized by being a non-vulcanized non-integral one in which a rubber sheet and a rust-proof metal plate are alternately stacked.

Here, "non-vulcanized non-integral" means that the rubber pad body is not a vulcanized integral molded product. More specifically, the rubber pad body is not subjected to a vulcanizing step, and therefore, the rubber sheet-metal plate The gap is not vulcanized. The rubber sheet itself is previously subjected to a vulcanization step independently of the metal plate, and such a rubber sheet is overlaid on the metal plate.

Further, the sliding material and the rubber pad body of the sliding seismic isolation device can be integrated by a known method such as an adhesive.

Further, in order to slide between the sliding material and the sliding material of the seismic isolation device without slipping between the rubber sheet and the metal plate of the rubber pad body at the time of the earthquake, the coefficient of friction between the rubber sheet and the metal plate is determined by the sliding material and the sliding. Set larger than the coefficient of friction between mating materials.

The rust-prevention treatment includes, in addition to rust-preventive painting and soaking in zinc, a mode in which a metal plate is made of a stainless steel plate, an aluminum plate or the like.

The rubber pad body can be assembled at a factory, carried in and installed on site, and a sliding material, a rubber sheet and a metal plate can be superimposed on site.

[0013] The method for constructing a sliding seismic isolation structure according to the present invention is a method for constructing the above-described sliding seismic isolation structure, wherein the rubber sheet and the metal plate are overlapped on site.

That is, an embodiment in which the above-described rubber sheet and metal plate are overlaid on site is claimed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing a sliding seismic isolation structure according to the present invention. A sliding seismic isolation device 10 and a rubber pad body 20 are provided between a foundation footing 1 and a building footing 2 which are vertically opposed to each other. It is interposed in series with the former facing up.

In the construction of the sliding seismic isolation structure,
As schematically shown in FIG. 3, at the site, first, a flange 23 is fixed to the foundation side footing 1 by bolting,
Next, the rubber sheet 21 and the steel plate 22 that has been subjected to the required rust prevention treatment are simply alternately overlapped on the flange 23 without interposition of an adhesive or the like, thereby obtaining a non-vulcanized non-integrated rubber pad body 20 as a whole ( The rubber sheet itself has undergone a vulcanization process.) It is desirable that the diameter of the rubber sheet 21 be slightly smaller than that of the steel sheet 22. Then, the sliding material 11 of the sliding seismic isolation device 10 is fixed on the rubber pad body 20 with an adhesive or the like. On the other hand, the sliding partner material 12 of the sliding seismic isolation device 10
Is fixed to the building side footing 2 by an ordinary method. still,
The rubber pad body 20 can be manufactured in a factory.

FIG. 2 shows the seismic deformation state of the above-mentioned sliding seismic isolation structure. By setting the friction coefficient between the rubber sheet 21 and the steel plate 22 to be larger than the friction coefficient between the sliding material 11 and the mating material 12, the conventional method is used. The same seismic isolation effect as a vulcanized integrated molded product can be achieved.

For example, the space between the upper and lower footings 1 and 2 is hermetically surrounded by a transparent vinyl sheet 30 (see FIG. 1), and an oxygen scavenger is accommodated in the inside thereof.
(2) The rust prevention can be made more reliable, and the deterioration of the sliding seismic isolation structure can be surely prevented.

[0020]

As described above, in the sliding seismic isolation structure and the construction method according to the present invention, a costly vulcanization step is not required for the rubber pad body added in series to the sliding seismic isolation device. It can be greatly reduced, and fabrication and construction are easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a sliding seismic isolation structure according to the present invention.

FIG. 2 is an explanatory view showing an earthquake deformation state of the sliding seismic isolation structure according to the present invention.

FIG. 3 is an explanatory view schematically showing a state in which a rubber pad body and the like are installed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Footing 1 foundation side 2 Footing 2 building side 10 Slope seismic isolation device 11 Sliding material 12 Sliding partner material 20 Rubber pad body 21 Rubber sheet 22 Steel plate 23 Flange 30 Transparent vinyl sheet

Claims (2)

[Claims] 1. A seismic isolation structure having a sliding seismic isolation device and a rubber pad body interposed in series between a lower structure and an upper structure, wherein the rubber pad body has been subjected to a rubber sheet and a rustproof treatment. A non-vulcanized, non-integrated structure in which metal plates are alternately superposed on each other. 2. The method for constructing a slip-isolation structure according to claim 1, wherein said rubber sheet and said metal plate are overlapped on site.