JP3253272B2 - Fireproof joints of seismically isolated buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof joint of a seismic isolation building, and more particularly to a fireproof joint constituting a fireproof section of a building on which a seismic isolation device is installed.

[0002]

2. Description of the Related Art As a seismic isolation device used for a building, a device composed of a laminated body formed by alternately stacking a steel plate and a rubber is widely used. It has a structure and each piece has fire resistance. Generally, seismic isolation devices are installed between the foundation and the building,
The impact is not transmitted directly to the building, and the seismic isolation device bears the load of the building.

By the way, the seismic isolation device is not only installed under the structure and between the foundation, but also in the future, the scope of application is expanded for the seismic isolation structure of the structure, and in response to the high rise of the building In order to do so, it is essential to install it in any location. When the seismic isolation device is installed in the middle layer of a building, especially when a fire starts from the floor where the seismic isolation device is installed or a lower level, the elasto-plastic deformation performance, elastic restoring force, and load resistance of the seismic isolation device due to heat from the fire With the deterioration of the seismic isolation function such as capacity, the verticality of the structures that make up the floor above the floor where the seismic isolation device is installed will also be affected.

On the other hand, in the case of a fire compartment according to the Building Standards Law, in the event of a fire, the inside of the fire compartment is formed as a closed space from the outside by a fire prevention means including a fire wall made of a fire-resistant material so as to block fire and high heat. Has become. Therefore, when the seismic isolation device is installed in the middle layer of the building, the outer wall of the building which is a part of the structure, the boundary wall of the stairwell, and the staircase for the movement of people, the elevator shaft, the dust chute for the transfer of goods, Fire barriers that form hard-hole sections that continuously penetrate buildings, such as linen chute and equipment shafts such as air-conditioning / exhaust ducts, supply / exhaust pipes or power distribution communication cables, are directly related to seismic isolation devices. In addition, a fire barrier and a seismic isolation device may be co-existing on the same floor as an area section or a section for different purposes including an underground mall, a parking lot, a theater, and the like.

[0005]

However, the seismic isolation device allows displacement of a phase difference between a lower floor where the base floor itself is installed and an upper floor supported by the base floor itself when an earthquake occurs, or This allows the skeleton supported by itself to be displaced with respect to the foundation on which it is installed so that it can flexibly respond. On the other hand, the fire wall (including the outer wall) that forms the fire protection section is a rigid body made of fire-resistant material, and the upper and lower floors or the foundation and the building are tightly connected to each other and the inside of the fire protection section including the seismic isolation device from the outside. It must be shut down and maintain a function to prevent the fire compartment from being directly exposed to fire or high heat and spreading the fire after the earthquake.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem of a fireproof joint which coexists with a seismic isolation device, does not interfere with the behavior of the seismic isolation device, and does not impair the fireproof performance even after an earthquake occurs. The purpose of the compartment is to provide a sustainable fire joint.

[0007]

In order to achieve the above object, a fireproof joint of a seismic isolation building according to the invention of claim 1 of the present application is a fireproof wall for a seismic isolation building in which a seismic isolation device is installed. A sliding part is provided between the upper firewall and the lower firewall, or between the firewall and the foundation or floor surface, and a heat-resistant component is mounted on the sliding part as a sliding member. A refractory joint, comprising: a refractory member having a cushioning property for the heat-resistant structure; and a metal support fitting for supporting the heat-resistant component and attaching the fire-resistant component to a fire wall side. A girder plate portion abutting on the sliding contact surface of the girder, a side plate portion bent upward from one end thereof and fixed to the side surface of the fire wall, and a side plate portion bent downward from the other end of the girder plate portion And separating the beam plate portion in the width direction thereof and separating them, It is summarized as the use of those constituted by connecting via an insulator.

According to a second aspect of the present invention, in a base-isolated building in which a seismic isolation device is installed, a firewall is divided between an upper firewall and a lower firewall, or between a firewall and a foundation or floor. And a heat-resistant joint having a heat-resistant component as a sliding member in the sliding-contact portion, wherein the heat-resistant component has a cushioning property, and A metal support fitting to be supported and attached to the fire wall side, and a girder plate portion to be brought into contact with the sliding contact surface of the fire protection wall on the metal support fitting, and downward from both ends of the girder plate portion. A bent side plate portion and a support plate for fixing one side plate portion to the side surface of the fire wall are formed, and the girder plate portion is divided in the width direction to be separated from each other, and both divided plate portions are thermally insulated. The gist of the invention is to use a structure that is connected through a body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred embodiment of the present invention, as shown in FIGS. 1 and 2, a sliding wall is divided into a sliding contact portion between an upper firewall 1 and a lower firewall 2. In the structure of the fire wall on which the heat-resistant component P is mounted as a moving member,
The heat-resistant structure P is composed of a metal support fitting A ₁ and a refractory member B supported by the metal and having a cushioning property,
The metal supporting member A ₁ is fixed to the side of the upper fire barrier 1 by anchor bolts 11 by bending upward from one end of the girder plate portion 3 abutting on the sliding contact surface of the upper fire wall 1. It is formed of a side plate portion 4 and a side plate portion 5 bent downward from the other end of the girder plate portion 3 and divides the girder plate portion 3 in the width direction thereof so as to be separated from each other. A heat insulating plate 6 is applied to the back side of the device and fixed by a tapping screw 7.

[0010]

1 and 2 show a first embodiment of the present invention.
In this embodiment, in a base-isolated building in which a seismic isolation device is installed, a metal supporting bracket A is used as a sliding member at a sliding contact portion between an upper firewall 1 and a lower firewall 2 obtained by dividing a firewall.
₁ shows a structure in which a heat-resistant structure P composed of a refractory member B having a cushioning property and supported by it is provided.

[0011] The metal support bracket A ₁ is used steel plate material, a girder part 3 abutting the sliding contact surface of the upper fire wall 1, side plate portions projecting bent respectively downwards from its widthwise opposite ends 4 and 5, the beam plate portion 3 is divided in the width direction thereof and separated from each other, and a heat insulating plate 6 such as a calcium silicate plate or the like, in which the divided plate portions 3a and 3b are applied to the back surfaces thereof. It is configured to be connected via For connection of the heat insulating plate 6,
After screwing into the split plate portions 3a and 3b using the tapping screw 7, the screw portion protruding from the surface of the plate portion is cut off.

The refractory member B having a cushioning property is as follows:
The core 8 of the rock wool, and the outer shell 9 of ceramic fiber blankets surrounding this, composed of a refractory skin 10 such as glass cloth or refractory nonwoven fabric covering the surface, by bonding it to the support bracket A ₁ I support them.

[0013] The heat-resistant structure P is abutting the wall surface of the upper fire wall 1 a side plate portion 4 of the support bracket A ₁ with an end portion of the skin 10, the firewall via the anchor bolt 11 suitable for number It is fixed to the side and is held on the upper fire wall 1.
The heat-resistant structure P is provided on the sliding contact portion in a state where the refractory member B having cushioning properties is compressed in the vertical direction.

With the above configuration, the divided upper fire wall 1
And the lower firewall 2 are allowed to be displaced in different phases. Therefore, the function does not interfere with the function of the seismic isolation device (not shown), and the upper fire protection wall 1 displaced integrally with the heat-resistant structure P is not damaged and the fire protection function is not lost.

The metal support fitting A ₁ constituting the heat resistant structure P is located outside the fire wall (in the figure, on the left side of the fire wall).
When a fire occurs, the heat is transmitted to the inside of the fire compartment partitioned by the fire wall (the right side of the fire wall in the figure), and there is a drawback that this becomes an undesired thermal bridge for the fire wall. However, the metal supporting bracket A ₁ having the above-described configuration is configured such that the beam plate portion 3 is divided in the width direction and separated from each other, and the divided plate portions 3 a and 3 b are connected by the heat insulating plate 6. The supporting function is not impaired, and the thermal bridge due to heat conduction can be more reliably prevented.

FIGS. 3 and 4 show a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which is the same as that of FIG. In the present embodiment, a metal support fitting A ₂
In this example, both ends of the girder plate portion 3 are bent downward in the same direction to form side plate portions 5 and 5 ', and a metal support plate 12 (piece material) is provided at a required interval in the longitudinal direction of the side plate portion 5'. The support plate 12 is fixed to the side of the upper fire barrier 1 via anchor bolts 11 and held on the upper fire barrier 1.

[0017] In the supporting bracket of A ₁ structure of the embodiment of Figures 1-2, the side plate portions 4 attached to the upper firewall 1 to about 4
Although the rise of 0mm of length is required, the support bracket A ₂ is a metal-made support plate 12 only the fixed part of the U-shaped bracket consisting a girder part 3 and the side plate portions 5 and 5 ' As a result, the support plate 12 can be raised up to a length of about 20 mm, and as a result, the heat receiving area can be reduced. It can be more reliable.

Table 1 below shows the results of a fire resistance test performed on the metal support fittings of the above-mentioned Examples and Comparative Examples.

[0019]

[Table 1]

In the fire resistance test, heating was performed for 2 hours in accordance with JIS-A-1304. That is, on the left side of the fire wall, a heating furnace including a part of the wall body and a metal supporting bracket is formed, a hot gas is sent into the heating furnace, and the temperature in the furnace is shown in Table 2 below with time. The temperature of the side plate exposed to the right side of the fire wall was measured using a thermocouple.

[0021]

[Table 2]

From the results of the above fire resistance test, it was confirmed that the metal support fitting used for the heat resistant structure of the present invention had an excellent effect of suppressing thermal bridges. The same effect as described above can be obtained by providing a sliding portion between the fire wall and the foundation or floor surface and attaching the heat-resistant structure as a sliding member to the sliding portion. .

[0023]

As described above in detail, according to the present invention, a seismically isolated building capable of maintaining a fireproof compartment without interfering with the behavior of the seismic isolation device and without impairing fire resistance even after an earthquake occurs. A fireproof joint is obtained. In particular, according to the present invention, a metal support fitting with a suppressed thermal bridge can be used for the heat-resistant component constituting the fireproof joint, so that the reliability of the fireproof joint can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fireproof joint of a base-isolated building showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a metal support fitting of the first embodiment.

FIG. 3 is a sectional view of a fireproof joint of a base-isolated building showing a second embodiment of the present invention.

FIG. 4 is a perspective view of a metal support fitting of the second embodiment.

[Explanation of symbols]

1 lower firewall dividing the divided upper firewall 2 fire wall fire wall P refractory structure A ₁ to A ₂ metal support bracket 3 digits plate portion 3a, 3b dividing plate portions 4,5,5 'side plates Part 6 Heat insulating plate 7 Tapping screw B Fireproof member 8 Core material 9 Outer shell 10 Skin 11 Anchor bolt 12 Support plate (piece material) 13 Screw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-2042 (JP, A) JP-A-4-272372 (JP, A) JP-A 10-280728 (JP, A) 23550 (JP, U) Registered utility model 3045590 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/94

Claims (2)

(57) [Claims] 1. A seismic isolation building in which a seismic isolation device is installed, a sliding portion between an upper firewall and a lower firewall dividing a firewall, or between a firewall and a foundation or a floor. A fire-resistant joint for mounting a heat-resistant component as a sliding member on the sliding contact portion, wherein the heat-resistant component has a cushioning-resistant fire-resistant member, and the fire-resistant member is supported on the fire barrier side. A metal support fitting to be attached, a girder plate portion abutting on the sliding contact surface of the fire wall, and a bend upward from one end thereof fixed to the side surface of the fire wall. Side plate part, and a side plate part bent downward from the other end of the girder plate part, and the girder plate part is divided in the width direction and separated, and both divided plate parts are interposed via a heat insulator. A fire-resistant joint of a base-isolated building, characterized by using a structure that is connected to a building. 2. In a base-isolated building in which a seismic isolation device is installed, a sliding contact portion between an upper firewall and a lower firewall dividing a firewall, or between a firewall and a foundation or a floor surface. A fire-resistant joint for mounting a heat-resistant component as a sliding member on the sliding contact portion, wherein the heat-resistant component has a cushioning-resistant fire-resistant member, and the fire-resistant member is supported on the fire barrier side. A metal support fitting to be attached, the metal support fitting, a girder plate portion abutting on a sliding contact surface of the fire wall, and a side plate portion bent downward from both ends of the girder plate portion, One side plate portion is formed of a support plate fixed to the side surface of the fire wall, and the beam plate portion is divided in the width direction and is separated,
A fire-resistant joint for a base-isolated building, comprising a structure in which both divided plate portions are connected via a thermal insulator.