JPH0336990B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention uses seismic isolation members to separate an upper structure and a lower structure of a building and allow freedom in their relative positional relationship. The present invention relates to a method of constructing a seismically isolated building with a continuous upper structure and lower structure.

《Prior art》 Conventionally, the lower structure of a building frame was constructed on the foundation ground, and seismic isolation members such as those made by alternately laminating thin metal plates and rubber, or those with a spring structure were interposed thereon. There is a seismic isolation structure that constitutes an upper structure and does not connect the upper structure and the lower structure integrally, but maintains mutual positional freedom.

In the construction process of this type of building, temporary scaffolding, stationary lifting equipment, etc. are installed inside and outside the building itself, and the construction process continues.

[Problems to be solved by the invention] In that case, if an earthquake occurs while construction is being carried out on the upper floors while supporting the vertical load on the seismic isolation members, the structure, temporary scaffolding, and stationary lifting equipment will be damaged. Differences in shaking direction and frequency occurred between the two, creating a dangerous situation for workers and scaffolding.

The present invention was made in view of the above circumstances, and its purpose is to reduce the risk of earthquakes during construction by making the shaking of temporary structures and buildings directly installed on the ground the same. .

<Means for Solving the Problems> In order to achieve the above object, the method for constructing a seismic isolation building according to the present invention includes installing a seismic isolation member between the upper structure and the lower structure of the building frame. During the construction of a seismically isolated building, the upper structure and the lower structure are directly connected and integrated using a fixed member that spans the upper and lower structures. The function of the member is restricted, and the fixing member is removed after construction of the building is completed.

<<Operation>> According to the above method, if an earthquake occurs while temporary structures are installed, the operation of the seismic isolation members will be restricted because the upper and lower structures are integrally connected.
The difference in rocking motion between the superstructure and the construction temporary structure becomes smaller.

After the construction of the building is completed, the fixed members that connect the upper and lower structures are removed, so the seismic isolation function is restored and normal operation is resumed.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 illustrates the state during construction, in which the upper part of a lower structure 4 consisting of a retaining wall 2 and a foundation 3 is exposed in a depression created by excavating the ground 1. A seismic isolation member 7 made of alternately laminated metal thin plates and rubber plates is installed on a support point 6 at which the lower structure 4 supports the upper structure 5 of the building frame. The main pillar portion 8 of the upper structure 5 rests thereon.

A dog run 9 is provided that integrally extends outward from the side of the upper structure 5 and covers the lower structure 4.

During the construction of a seismic isolation structure like the one described above, temporary scaffolding 10 is installed, and in the figure, one side of the scaffolding 10 hangs over the top of the Inuhashiri 9, and the other side rests on the ground surface of the ground 1. There is. If the seismic isolation member 7 operates in such a state, it will cause a relative positional shift between the upper structure 5 and the temporary scaffold 10, and the distance difference between the upper structure 5 and the upper structure 10 will increase becomes large and dangerous.

Therefore, a support seat 11 is interposed between the upper and lower outer ring surfaces of the seismic isolation member 7 and the surface where the support point 6 and the main column portion 8 are in contact with each other.
Drive insert bolt 12-12 into -11. Alternatively, the insert bolts 13-13 are driven at any upper arbitrary position on the inner surface of the retaining wall 2 and in the vicinity thereof, along with the position on the inward rear surface of the dog run 9.

Next, attach the flat metal fixing member 14 to the bolt 1.
It tightens between 2 and 12. Alternatively, the fixing member 14a of the metal L-shaped fitting is tightened between the bolts 13-13.

The bolt holes of the fixing members 14, 14a are preferably formed into elongated holes in advance to accommodate the sinking of the seismic isolation member 7. Incidentally, the diameter of the bolts 12 and 13 is approximately 16 m/m.

During the construction work, the upper structure 5 is
and the lower structure 4 are directly connected and integrated. Thereafter, when the construction is completed, the fixing members 14, 14a may be removed.

A protection plate 15 is attached with one bolt 13 between the dogbashiri 9 and the retaining wall 2 that remain after the fixing member 14a is removed.

The protection plate 15 is made of an elastic-plastic material, and even after being bent into an L-shape, it tends to return to its original flat plate shape.
For example, galvanized iron plates, flame-retardant rubber sheets, etc. are preferable.

The protective plate 15 is necessary to completely isolate the inside and outside of the building once the building is completed, and to constitute a fireproof division. In addition, by using an elastic-plastic material, the smooth sliding of the dogbashiri 9 and the retaining wall 2 during an earthquake is not prevented.

<<Effects>> As explained above in detail, according to the construction method of a seismically isolated building according to the present invention, the upper structure and the lower structure are integrated with fixing members only during the construction work, so temporary structures are The shaking directions and frequencies of the structure and structure may approach each other, causing the structure and temporary object to collide with each other.
The danger of losing the center of gravity of the temporary structure due to the reaction can be avoided.

Moreover, since the fixing member is removed after the construction work is completed, the function of the seismic isolation building can be performed without impairing the function of the seismic isolation member.

[Brief explanation of drawings]

Figure 1 is a partial sectional view showing the surrounding area including the seismic isolation members during construction of a seismic isolation building;
FIG. 3 is a partial sectional view showing the fixing member after construction is completed, FIG. 4 is an explanatory view showing an example of how the protection plate is attached, and FIG. 5 is a perspective view illustrating the protection plate. 4... Lower structure, 5... Upper structure, 7...
Seismic isolation member, 14, 14a... fixed member.

Claims (1)

[Claims] 1. When constructing a seismically isolated building in which a seismic isolation member is installed between the upper structure and the lower structure of the building frame, the upper structure and the lower structure are The structure is characterized in that the upper structure and the lower structure are directly connected and integrated by a fixing member that spans over the structure to restrain the action of the seismic isolation member, and the fixing member is removed after construction of the building is completed. Construction method for seismically isolated buildings.