JPH09235908A - Seismic isolation method for stairs and seismic isolation staircase building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building with stairs in base isolation structure in which seismic force on an earthquake can be decreased for damping vibrations quickly and thereby an escape passage can be secured sufficiently for each of stories. SOLUTION: Stairs 13 for a specified number of stories are provided at the inside of a frame, and a stairs frame 10 installed along the exterior of a building 2 and bearing devices 8 interposed between the stairs frame and foundation parts 6 for supporting the stairs frame so that the frame can be displaced horizontally against the foundation parts are provided. Then, dampers 12, each arranged horizontally between opposite laterals of the building and the stairs frame and produces damping force as horizontal distance between the laterals of the building and the stairs frame varies, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation method for a staircase and a seismic isolation staircase building, which can quickly dampen a sway when an earthquake occurs to secure a blameless passage on the upper and lower floors.

[0002]

2. Description of the Related Art Normally, in a building with stairs installed inside, when an earthquake occurs, if the upper and lower floors cause a displacement between floors and the building shakes, the stairs that extend diagonally between the upper and lower floors cause an earthquake. Bear most of the power.

The stairs arranged along the outer wall of the building also directly bear the seismic force from the ground when an earthquake occurs.

[0004]

By the way, when a large earthquake occurs, the stairs are the only blame passages from the upper floor to the lower floor, so it is necessary to surely prevent destruction and collapse. However, as described above, since the conventional stairs have a structure that directly bears the seismic force, it is difficult to avoid destruction or collapse.

Therefore, the present invention has been made in view of the above circumstances, and it is possible to reduce the seismic force at the time of occurrence of an earthquake and quickly damp the shaking to sufficiently secure a slam passage on the upper and lower floors. The purpose is to provide a seismic isolation method for stairs and a seismic isolation staircase building.

[0006]

In order to solve the above-mentioned problems, a method of seismic isolation of stairs according to claim 1 is to provide a stairway of a predetermined floor inside a frame when an earthquake occurs, or inside a building. The stair frame installed along the outside of the building is displaced in the horizontal direction with respect to the foundation part by a support device interposed between the stair frame structure and the foundation part, and the building and the stair frame structure are mutually displaced. The damper disposed between the facing side portions suppresses the horizontal displacement of the stair frame by generating a damping force.

In the seismic isolation staircase building according to claim 2, a stairway of a predetermined floor is provided inside the frame structure, and a stair frame structure is installed inside or outside the building, and the stair frame structure and the foundation part. A supporting device interposed between the building and the stair frame to support the stair frame so that the stair frame can be displaced in the horizontal direction with respect to the base part, and extends horizontally between the side parts of the building and the stair frame facing each other. And a damper that generates a damping force when the horizontal distance between the side portions of the building and the stair frame changes.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a base isolation staircase building according to the present invention will be described below with reference to the drawings. FIG. 1 shows a seismic isolation staircase building 4 of the first embodiment.
Has the same height as the middle-rise building and is installed on the ground along the outer wall of the middle-rise building 2.

FIG. 2 shows the concrete structure of the seismic isolation staircase building 4 up to the second floor. A staircase building foundation (foundation) 6 is buried in the ground adjacent to the building 2. ,
A stair frame (frame) 10 is installed on this staircase ridge foundation 6 via a supporting device 8, and the building 2 and stair frame 1
The damper 12 is arranged between the side portions facing each other.

FIG. 3 is a plan sectional view of the second floor portion of the stair frame 10, and FIG. 4 is a plan sectional view of the first floor portion of the stair frame 10. The stair frame 10 is a square plan view. Four steel columns 1 arranged in a shape and extending vertically
0a and a plurality of steel frame beams 10b that horizontally connect adjacent steel frame columns 10a and connect them, and are formed as a rectangular parallelepiped frame frame. A damper mounting steel beam 10c extending horizontally toward the outer wall of the building 2 is connected to each of the two or more floors of the stair frame 10.

Inside the stair frame 10, there is installed a stairway portion 13 of a folded type which is continuous from the first floor to the top floor, and the landing 1 is provided for each half-story of the folded portion of the staircase.
4 are provided. In addition, landing 1 on each floor above the 2nd floor
4 and a floor of the entrance / exit 2a of each floor of the building 2 spans a trap 16 made of a metal plate.

Further, the support device 8 includes four steel columns 14a.
Four units are installed between the lower surface of the staircase foundation 10 and the upper surface of the staircase ridge foundation 6, which is the lower position of the. As shown in FIG. 5, each supporting device 8 is arranged between the upper surface of the staircase ridge foundation 6 and the lower flange 8a, and the first supporting portion 8b and the lower flange 8a and the upper flange 8c. The second supporting portion 8d is provided. And the first bearing portion 8b
Has a structure in which a plurality of metal plates such as iron plates are alternately laminated in the vertical direction, and the second support portion 8d has a structure in which the metal plates and the rubber are alternately laminated in the horizontal direction between the upper and lower plates. In addition, the anchor bolt 8e protruding upward from the inside of the stairs foundation 8 includes the first support portion 8b and the lower bulge 8b.
And is screwed onto the nut at the upper part of the lower flange 8b.

The damper 12 is, as shown in FIG.
A coil 12a having a coil axis oriented horizontally is used, and flanges 12b and 12c are fixed to both ends of the coil 12a in the axial direction. Then, one flange 12b is fixed to the outer wall of the building 2 by a chemical anchor bolt 12d, and the other flange 12c is fixed to the tip of the damper mounting steel beam 10c.
It is fixed via d and a fastening bolt 12e.

The operation of the seismic isolation staircase wing 4 having the above-described structure will be described.
Since the second support portion 8d of the support device 8 installed between the staircase ridge foundation 6 and the staircase frame 10 is elastically deformed in the horizontal direction, the staircase frame 10 sways with a long period. For this reason,
The seismic force input to the staircase frame 10 decreases.

In addition, when the earthquake occurs, the building 2 also shakes,
Since the cycle of this building 2 is different from the staircase frame 10 which swings in a long cycle by the support device 8, the building 2 and the staircase frame 10
The horizontal distance between the opposite sides of and repeatedly increases and decreases. At this time, the damper 12 on each floor, which is arranged between the damper mounting steel beam 10c and the building 2, has the building 2 and the stair frame 1
When the distance in the horizontal direction from 0 increases, the stretching operation is performed, and when the distance decreases, the elasto-plastic deformation is caused while performing the retracting operation. Then, the vibration of the building 2 and the stair frame 10 is quickly attenuated by the absorption of the hysteresis energy due to the elastic-plastic deformation of the damper 12.

When a large-scale earthquake of seismic intensity 4 or higher occurs, the first bearing portion 8b of the bearing device 8 installed between the staircase building foundation 6 and the staircase frame 10 also slips, causing the first bearing portion to slip. Since the frictional force of 8b consumes a large amount of energy, the stair frame 10 further swings and the input seismic force is reduced. And, as with the occurrence of small and medium-sized earthquakes, building 2
The horizontal distance between the mutually facing sides of the building 2 and the staircase frame 10 repeatedly increases and decreases due to the swaying between the staircase frame 10 and the staircase frame 10 with different cycles. Due to the absorption of the hysteresis energy by, the sway of the building 2 and the stair frame 10 is quickly attenuated.

In this way, the seismic isolation staircase building 4 of this embodiment is used.
The seismic force input to the staircase frame 10 is reduced by the support device 8 installed between the staircase ridge foundation 6 and the staircase frame structure 10, and the space between the building 2 and the staircase frame structure 10 facing each other is reduced. The arranged damper 12 repeatedly expands and contracts due to the shaking of the building 2 and the stair frame 10 with different periods to cause elastic-plastic deformation, and quickly absorbs the vibration of the building 2 and the stair frame 10 by absorbing the hysteresis energy. It is possible to prevent the building 2 and the staircase ridge 10 from being destroyed or collapsed. Further, since the shaking of the staircase ridge 10 is quickly attenuated, it is possible to sufficiently secure the slam passage on the upper and lower floors when an earthquake occurs.

Next, FIGS. 7 and 8 show the seismic isolation staircase building 20 of the second embodiment, and this seismic isolation staircase building 20 is installed inside a middle-rise building 22. That is, the staircase ridge foundation 24 is formed at the bottom of the inside of the building 22, and the staircase frame 10 is installed on the staircase ridge foundation 6 via the support device 8, and the inner wall of the building 22 and the staircase frame 10 are connected. The dampers 12 are arranged while facing each other. The supporting device 8, the stair frame 10 and the damper 12 have the same structure as that of the first embodiment.

In the seismic isolation staircase building 20 having the above structure, the seismic force input to the staircase structure 10 is reduced by the support device 8 installed between the staircase building foundation 24 and the staircase structure 10, and the building 2
The damper 12 arranged between the inner wall of 2 and the staircase frame 10 faces each other to repeatedly expand and contract due to the shaking of the building 2 and the staircase frame 10 at different periods, causing elastic-plastic deformation, and absorption of hysteresis energy to the building. Since the sway of 2 and the staircase frame 10 is quickly attenuated, it is possible to prevent the building 22 and the staircase building 10 from being destroyed or collapsed. Further, since the shaking of the staircase ridge 10 is quickly attenuated, it is possible to sufficiently secure the slam passage on the upper and lower floors when an earthquake occurs.

In each of the above-mentioned embodiments, the coil for generating the elasto-plastic hysteresis energy is used as the damper 12 to suppress the large shaking of the buildings 2 and 22 and the stair frame 10 when an earthquake occurs. The gist of the invention is not limited to this, and an oil damper or a friction damper may be used as long as the damping effect is generated according to the change in the distance between the building 2 and the stair frame 10 when an earthquake occurs. The same effect can be obtained.

Further, in the above embodiment, the damper 12 has two
It is installed on each floor above the floor, but it is not limited to this, and may be installed only on even floors, for example, in the building 2,
Since 22 and the upper floor portion of the stair frame 10 largely shake, a damper 12 having a low spring constant may be used as the damper 12 on the upper floor so that a sudden damping effect does not occur.

Further, the support device 8 is not limited to the above structure, but may be any other device as long as it supports the stair frame 10 and reduces seismic force.

[0023]

As described above, according to the present invention, when an earthquake occurs, the seismic force input to the stair frame is reduced by the support device installed between the foundation and the stair frame, and the building and the staircase are reduced. The dampers arranged between the side portions facing each other with the frame generate damping force due to the horizontal distance between the side portions of the building and the stair frame changing due to the shaking of the building and the stair frame with different cycles, Since the shaking of both the stair frames is quickly attenuated, it is possible to prevent the building and staircase from being destroyed or collapsed. Further, since the shaking of the stair frame is quickly attenuated, it is possible to sufficiently secure the slam passages on the upper and lower floors when an earthquake occurs.

[Brief description of drawings]

FIG. 1 is a view showing a seismic isolation staircase building according to the present invention installed along the outside of a building.

FIG. 2 is a side view showing a lower layer portion of the seismic isolation staircase building according to the present invention.

FIG. 3 is a view taken along line III-III in FIG. 2;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 2;

FIG. 5 is a view showing a bearing device according to the present invention.

FIG. 6 is a diagram showing a damper according to the present invention.

FIG. 7 is a view showing a seismic isolation staircase building according to the present invention installed inside a building.

8 is a view taken along the line VIII-VIII of FIG.

[Explanation of symbols]

 2, 22 building 4 seismic isolation staircase building 6 staircase building foundation (foundation) 8 support device 10 stair frame 12 damper 13 staircase

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Masuse Inventor Hideo Masuse, No. 1 Shino Nishi Goshoda-cho, Kita-ku, Kyoto City, Kyoto Prefecture Shimazu Corporation Shino Plant

Claims (2)

[Claims] 1. When an earthquake occurs, a staircase is provided between the staircase structure and the foundation section, with a staircase on a predetermined floor provided inside the structure and installed along the inside or outside of the building. Displaced in the horizontal direction with respect to the foundation part by the mounted bearing device, and the displacement in the horizontal direction of the stair frame is generated by the damping force generation of the damper arranged between the side parts of the building and the stair frame facing each other. A seismic isolation method for stairs characterized by being controlled. 2. A stairway structure provided with a predetermined level of stairs inside the frame structure and installed along the inside of the building or along the outside of the building, and the staircase structure interposed between the staircase structure and the foundation. A supporting device for supporting the base part so as to be displaceable in the horizontal direction, and the supporting device supporting the building part and the staircase structure so as to extend horizontally between the opposite side parts of the building and the staircase structure. A seismic isolation staircase building, comprising: a damper that generates a damping force by changing the horizontal distance between the sides of the seismic isolation staircase.