JPH059393Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a fireproof coating for isolators of seismically isolated buildings using vibration isolators (isolators) such as laminated rubber bearings.

<Conventional Technology> In seismically isolated buildings, an isolator is installed between the foundation and the building to prevent earthquake shock from being directly transmitted to the building, and the isolator supports the load of the building.

[Problems to be solved by the invention] If an isolator is installed in the middle floor of a building, especially if a fire breaks out from a floor below the isolator, the isolator's elastoplastic deformability, elastic force, and load-bearing capacity will be affected. It can be expected that this will not only upset the isolator, but also affect the verticality of the superstructure that constitutes the hierarchy above the isolator.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a fireproof coating for isolators in seismically isolated buildings to protect the isolators from fire and improve safety.

<Means for Solving the Problems> In order to achieve the above object, the fireproof coating for isolators of seismically isolated buildings according to the present invention has its upper part fixed to the upper structure and hangs down on the outer peripheral surface of the isolator so as to surround the isolator. The covered fireproof cylindrical body and the fireproof cylindrical body are locked and fitted to the inner circumferential surface of the lower end of the cylindrical body, and are placed on the lower structure so as to be able to slide freely on the surface of the lower structure and to surround the base of the isolator. The structure includes a fire-resistant annular body that moves integrally with the cylinder by locking and fitting into the inner circumferential surface of the lower end of the fire-resistant cylinder that moves together with the rocking movement of the upper structure. be.

《Operation》 When the upper structure and the lower structure are displaced out of phase due to earthquake input, the fire-resistant annular body remains fitted to the inner peripheral surface of the lower end of the fire-resistant cylindrical body. The first side moves in accordance with the moving direction of the cylindrical body, and maintains the sealing inside the cylindrical body and the heat insulation effect of the air.

<<Example>> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partial longitudinal cross-sectional view for illustrating and explaining the seismic isolation building 1. As shown in FIG. This seismic isolation building 1 has a seismic isolation laminated rubber bearing 4 installed between the second basement floor part 2 and the third basement floor part 3, and this laminated rubber bearing 4 supports the upper structure above the second basement floor part 2. are doing.

That is, this seismic isolation building 1 is divided into two sections, with the upper structure 5 above the floor slab on the second basement floor sandwiching the seismic isolation laminated rubber support 4, and the lower structure 6 below the ceiling on the third basement floor 3. It's structured. Considering the dry area, the installation position of the seismic isolation laminated rubber support 4 may be above the ground level, for example, between the floor of the first floor and the ceiling of the first basement floor.
In either case, the laminated rubber bearings 4 will be exposed to the heat of a fire that breaks out from the floor below the installation location, and especially since the dry area will act as a chimney, the area around each laminated rubber bearing 4 will be A fireproof coating 7 is provided.

FIG. 2 shows details of the fireproof coating 7. There are mounting flanges 8 on the top and bottom of the seismic isolation laminated rubber support 4, which are tightened and fixed with nuts 9 to anchor bolts such as embedded plates provided on the installation base. Since the seismic isolation laminated rubber support 4 is cylindrical, the fireproof coating 7 is composed of a cylindrical fireproof tube 10 and a circular fireproof annular body 11 fitted therein so as not to use excess volume.

The refractory cylindrical body 10 and the refractory annular body 11 are made of molded rock wool or libras mortar, and the cylindrical body 10
The radius is larger by the horizontal displacement dimension d of the laminated rubber bearing 4, and the height is such that when the upper end surface is attached to the upper structure 5, the lower end surface is lifted by the vertical displacement dimension e of the laminated rubber bearing 4. Formed to size. One annular body 11 is formed with a radius that fits into the inner periphery of the cylindrical body 10, and has a height sufficiently higher than the vertical displacement dimension e of the laminated rubber support 4.

The fireproof cylindrical body 10 is suspended from the upper structure 5 by a shaft concentric with the laminated rubber support 4, and its upper end edge is fixed to the upper structure 5 so as to wrap the same. An annular body 11 that is slidably placed on the lower structure 6 is fitted to the inner peripheral side of the lower edge, and the laminated rubber support 4 is hermetically covered with the cylindrical body 10 and the annular body 11. be.

When the lower structure 6 swings due to earthquake input, the upper structure 5 is moved by the action of the laminated rubber bearing 4.
The shaking is caused by a delay in the earthquake input acceleration, and as a result, a difference occurs in the shaking direction, causing horizontal and vertical displacement in the laminated rubber bearing 4. The rubber bearing 4 moves on the lower structure 6 while remaining in place, ensuring a tight seal inside the cylinder 10, and there is no risk that the laminated rubber bearing 4 will be directly exposed to fire and smoke.

<<Effects>> As explained in detail above, according to the fire-resistant covering for isolators of seismically isolated buildings according to the present invention, the upper part is fixed to the upper structure and the fire-resistant covering is drooped on the outer peripheral surface of the isolator so as to surround the isolator. Since the cylindrical body is provided, it is possible to maintain a state surrounding the isolator at all times depending on the direction of deformation of the isolator.
Further, a fire-resistant annular body is provided that is lock-fitted to the inner circumferential surface of the lower end of the cylindrical body, is slidable on the surface of the lower structure, and is placed on the lower structure so as to surround the base of the isolator. Therefore, the isolator can be kept hermetically covered at all times by moving in unison with the moving direction of the cylindrical body.

Therefore, the isolator, which bears the load of the superstructure, does not change its characteristics or decrease its rigidity due to the heat of the fire, improving the reliability of the isolator and ensuring safety. can get.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view schematically showing the seismic isolation building, Figure 2 A is a vertical cross-sectional view showing the fireproof coating of the isolator, and Figure B is a cross-sectional view taken along the line C-C in Figure A. . 1... Earthquake-isolated building, 2... 2nd basement floor, 3...
3rd floor basement part, 4... Seismic isolation laminated rubber bearing, 5...
Upper structure, 6... Lower structure, 7... Fire-resistant coating, 8... Tsuba, 9... Nut, 10... Fire-resistant cylindrical body, 11... Fire-resistant annular body.

Claims (1)

[Claims for Utility Model Registration] (1) A fire-resistant cylindrical body whose upper part is fixed to the upper structure and which is drooped over the outer circumferential surface of the isolator so as to surround the isolator, and which is attached to the inner circumferential surface of the lower end of the cylindrical body. It consists of a fire-resistant annular body that is securely fitted and placed on the lower structure so as to be slidable on the surface of the lower structure and to surround the base of the isolator, and is integrated with the rocking movement of the upper structure. A fire-resistant coating for an isolator of a seismically isolated building, comprising a fire-resistant annular body that is lock-fitted to the inner peripheral surface of the lower end of the fire-resistant cylindrical body and moves integrally with the cylindrical body. (2) The fire-resistant cylindrical body has a facing dimension from the outer peripheral surface of the isolator to the inner peripheral surface of the cylindrical body that is equal to or larger than the horizontal displacement dimension of the isolator; A fireproof coating for an isolator of an earthquake-isolated building according to claim 1, wherein the fireproof coating is separated from the isolator by at least a vertical displacement dimension of the isolator.