JPH11270182A - Seismic isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute construction of an upper layer building frame and construction of a base isolation layer building frame in parallel so as to shorten the construction period by unitizing a footing positioned on the base isolation device of an upper structure, and forming the footing into steel construction or PC construction. SOLUTION: A base isolation device is provided on a constructed concrete foundation, a unitized footing 20 is loaded thereon, and the fitting base plate of the base isolation device is fixed to anchor members 27. Next, after arranging the pillar reinforcement 28 of the base isolation layer and beam reinforcement of a direct upstair setting the footing 20 as a supporting structure, concrete is placed around them to construct the pillar 21 of the base isolation layer and the beams 24 or the floor of the direct upstair. Consequently, reinforcement arranging and construction the pillar 21, the beams 24, and the floor of the upper floor than the direct upstair, and reinforcement arranging and construction of the beams 24 and the floor of the base isolation layer can be executed in parallel. Hereby the construction period is shortened, and by forming the footing 20 into steel construction, the steel construction and the reinforced concrete construction can be easily applied to the base isolation structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mitigating a horizontal force acting on a structure during an earthquake by a seismic isolation device.
The present invention relates to a seismic isolation structure that ensures the soundness of the structure.

[0002]

2. Description of the Related Art FIG. 5 shows a building 1 as an upper structure.
One structural example of a base-isolated structure having a base seismic isolation structure by interposing a plurality of seismic isolation devices 3 between a concrete foundation 2 as a lower structure and a concrete foundation 2 is shown.

In FIG. 5, as each seismic isolation device 3, a pair of mounting substrates 4 and 5 integrally mounted on the lower surface of the building 1 and the upper surface of the concrete foundation 2, respectively, and these mounting substrates A high damping laminated rubber bearing is shown, which is composed of a laminated rubber 6 which is integrally attached between the mounting substrates 4 and 5 and is elastically deformed by the relative movement of the mounting substrates 4 and 5 in the surface direction.

In the case of an earthquake or the like, the seismic isolation device 3 elastically deforms the laminated rubber 6 in the shearing direction with the relative movement of the building 1 and the concrete foundation 2 in the horizontal direction. By being caused, the horizontal seismic force during an earthquake is absorbed by the elastic deformation energy and the damping force, the horizontal seismic force transmitted to the building 1 is reduced, and the period of the shaking of the building 1 is reduced. Bigger,
The soundness of the building 1 is ensured.

Here, the seismic isolation device 3 is constituted not only by the illustrated high-damping laminated rubber bearing, but also by a combination of an elastic sliding bearing and a combination of a low-damping laminated rubber bearing and a damper.

[0006] Conventionally, when the above seismic isolation structure is constructed, as shown in FIGS. 6A and 6B, after the seismic isolation device 3 is installed on the concrete foundation 2, FIG.
(C) As shown in FIG.
And the seismic isolation device 3 is fixed between the first floor and the concrete foundation 2. Then, as shown in FIG. After arranging the bars (not shown), as shown in FIG. 6 (d), the upper floors are sequentially constructed by casting concrete and constructing the columns 9 on the first floor and the beams 10 on the upper floor. I am trying to do it.

[0007]

However, when a seismic isolation structure is constructed by such a conventional construction method,
There is a problem that the construction of the upper skeleton cannot be performed unless the construction of the skeleton (hereinafter referred to as the skeleton of the seismic isolation layer) such as the floor beams 7 and the floor on the first floor is completed. In addition, since the construction period required for the frame construction of each layer is directly recorded as the total construction period of the whole seismic isolation structure, there is a problem that the construction period is prolonged.

The present invention is intended to effectively solve the problems of the conventional seismic isolation structure as described above, and the construction of the upper layer and the construction of the seismic isolation layer are performed in parallel. To provide a seismic isolation structure that can shorten the construction period.

[0009]

A seismic isolation structure according to claim 1 is a seismic isolation structure having an upper structure built on a seismic isolation device, wherein the seismic isolation device for the upper structure is provided. It is characterized in that the footing located above is unitized. Here, the invention described in claim 2 is characterized in that the footing described in claim 1 is made of steel, and the invention described in claim 3 is described in claim 1. Is characterized in that the footing is made of PC.

In the seismic isolation structure according to any one of claims 1 to 3, a footing for connecting the upper structure and the seismic isolation device is unitized, and the seismic isolation device is installed after the seismic isolation device is installed. By installing the footing on the device, it is possible to continuously construct a seismic isolation layer rising portion such as a pillar on the seismic isolation device via the footing. By this, on the columns of the seismic isolation layer, it is possible to construct frames such as columns, beams and floors on the immediately upper floor, and based on the frames on these immediately upper floors, further construct the frame on the upper floor. be able to. Here, after the construction of the frame on the upper floor is completed, the construction of beams, floors, etc. in the seismic isolation layer is possible in parallel with the construction of the upper floor. Construction of the skeleton and construction of the skeleton on a floor higher than the immediately above floor can be performed in parallel, whereby the construction period can be shortened by at least one layer.

And, as in the invention according to claim 2,
The footing is made of steel to facilitate application to a steel structure. Also, as in the invention according to claim 3, the footing is made of PC, so that it can be applied to a reinforced concrete structure. make it easier.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the following description, the same parts as those in FIG.

The seismic isolation structure according to the present embodiment is characterized in that a footing 20 for connecting the building 1 as an upper structure and the seismic isolation device 3 is unitized as shown in FIG. The footing 20 has a substantially disk-shaped base plate 22 integrally attached to the lower end of a box-shaped column 21 by welding, and has a substantially disk-shaped external diaphragm on the outer periphery at a predetermined distance from the lower end of the column 21. 23 are integrally attached by welding so as to be in parallel with the base plate 22, and a stiffener (not shown) is attached to the opposite surface of the base plate 22 and the outer diaphragm 23 by 90 degrees around the axis of the column 21.
Are connected by welding at intervals of ゜, and furthermore, four beams 24 radially arranged from the column 21 in four directions,
A plurality of joint plates 25 and high-strength bolts 26 are connected to the base plate 22, the outer diaphragm 23, and the stiffener.

The base plate 22 is mounted on the mounting board 4 above the seismic isolation device 3 in a surface contact state, and the mounting board 4 is directed upward from below. A plurality of anchor members 27 to which fixing bolts (not shown) which are attached therethrough are screwed are fixed integrally at predetermined intervals around the axis of the column 21.

Next, an example of constructing the seismic isolation structure according to the present embodiment using the footing 20 configured as described above will be described with reference to FIGS. First, as shown in FIG. 2A, a concrete foundation 2 is constructed, and the seismic isolation device 3 is installed on the concrete foundation 2 using anchor bolts as shown in FIG. 2B.

Next, on the seismic isolation device 3 shown in FIG.
The unitized footing 20 is placed as shown by an arrow in FIG.
Then, the mounting substrate 4 above the seismic isolation device 3 is fixed by fixing bolts. Thus, as shown in FIG. 2 (c), the footing 20 is used as a supporting structure to arrange the column bars 28 of the seismic isolation layer, and at the upper end of the column bars 28, the beam bars 29 of the immediately upper floor are arranged. After the reinforcement, these column 28 and beam 2
9, concrete is cast around the base 9, and as shown in FIG. 2 (e), the columns 30 of the seismic isolation layer and the beams 31 and floors 32 immediately above the columns 30 are provided.
To construct.

At this point, the beams and floor of the seismic isolation layer can be constructed. However, since the columns 30 of the seismic isolation layer and the beams 31 and floor 32 of the floor immediately above are constructed as described above, By using these as supporting structures, it becomes possible to construct columns, beams and floors directly above the floor. Therefore, as shown in FIG. 3, the reinforcement of the columns 32 and beams 34 and the floor 35 by arranging the column reinforcements and the beam reinforcements on the floors higher than the immediately above floor and casting concrete into them.
Reinforcement of beam reinforcement of seismic isolation layer and beam 3 by casting concrete
6 and the construction of the floor 37 can be performed in parallel,
The construction period of the seismic isolation structure can be shortened accordingly. In the present embodiment, the footing 2
By making 0 a steel frame structure, it is easy to apply to a steel framed seismic isolation structure, and also to a reinforced concrete seismic isolation structure.

The above embodiment is an example, and various modifications can be made based on the structure of the seismic isolation structure to be applied, the type of seismic isolation device, design requirements, and the like. For example, in the above-described embodiment, the example in which the footing 20 is made of a steel frame is shown. However, instead of this, as shown in FIG. It is also possible to assemble the pillars 41 so as to be orthogonal to the above, and to cast concrete in a cross shape so as to surround these intersections to form a footing 42 made of PC. In this case, it is necessary to embed an anchor member such as an anchor bolt for fixing the footing 42 to the seismic isolation device so as to protrude from the lower surface of the footing 42. And column 4
Reinforcing bars continuous to 1 are performed by a mechanical connection method such as a lap joint, welding, or pressure welding.

[0019]

As described above, according to the seismic isolation structure of any one of the first to third aspects, the footing located on the seismic isolation device of the upper structure is unitized and isolated. By installing a footing on this seismic isolation device after installing the seismic device, it is possible to continuously construct a seismic isolation layer rising portion such as a pillar on the seismic isolation device using the footing as a support structure. On the columns of the seismic isolation layer, it is possible to construct frames such as columns, beams, and floors on the immediately upper floor, and based on the frames on the floor directly above, it is possible to further construct the frame on the upper floor. it can. Here, after the construction of the skeleton on the upper floor is completed, the skeleton of the seismic isolation layer can be constructed. Can be performed in parallel, whereby the construction period can be shortened by at least one layer.

And, as in the invention according to claim 2,
The footing is made of steel, thereby facilitating the application to a steel building structure. Also, as in the invention according to claim 3, the footing is made of PC,
Facilitates application to reinforced concrete buildings.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a footing used for a seismic isolation structure according to an embodiment of the present invention.

FIG. 2 is a construction process diagram of a seismic isolation structure according to an embodiment of the present invention.

FIG. 3 is a construction process diagram of the seismic isolation structure of one embodiment of the present invention.

FIG. 4 is an external perspective view showing a modified example of the footing of the present invention.

FIG. 5 is a longitudinal sectional view showing one structural example of a seismic isolation structure.

FIG. 6 is a construction process diagram of a conventional seismic isolation structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 2 Concrete foundation 3 Seismic isolation device 20 Footing 22 Base plate 42 Footing

Claims (3)

[Claims] A seismic isolation structure comprising an upper structure built on a seismic isolation device, wherein a footing located on the seismic isolation device of the upper structure is unitized. Structure. 2. The seismic isolation structure according to claim 1, wherein the footing is made of steel. 3. The seismic isolation structure according to claim 1, wherein said footing is made of PC.