JP6818462B2 - Fireproof structure - Google Patents

Description

The present invention relates to a fireproof structure that exhibits fireproof performance for a seismic isolation device constituting an intermediate layer seismic isolation device.

It is installed on the upper part of the lower column and is installed on the seismic isolation device that supports the joint between the reinforced concrete or steel reinforced concrete beam and the upper column, or on the upper part of the joint between the reinforced concrete or steel reinforced concrete beam and the lower column. Seismic isolation devices that make up the middle-layer seismic isolation of buildings, such as seismic isolation devices that support the upper pillars, are often treated as fireproof because they are the pillars of the main structural members under the Building Standards Law. ..

For example, Patent Document 1 discloses a seismic isolation structure in which a seismic isolation device installed on a structural support column and supporting a steel-framed reinforced concrete beam and a column-beam joint of the steel-framed column is covered with a fireproof coating material. Has been done.

However, the seismic isolation device installed on the upper part of the lower column supports the seismic isolation structure that supports the joint between the steel beam and the upper steel column, and the seismic isolation device installed on the upper part of the joint between the steel beam and the lower steel column. In the case of a seismic isolation structure that supports the upper pillars, even if this seismic isolation device is covered with a fireproof coating, there is concern that the fire resistance of the seismic isolation device will decrease due to the heat transferred from the joint where the temperature rises during a fire. Will be done.

Japanese Unexamined Patent Publication No. 2010-281669

In consideration of such facts, it is an object of the present invention to reduce the decrease in fire resistance of the seismic isolation device due to the heat transferred to the seismic isolation device through the joint between the column and the steel frame beam in the event of a fire.

The invention of the first aspect is the lower column and the upper column installed on the upper part of the lower column to support the joint portion between the upper column and the steel beam, or installed on the upper part of the joint portion between the lower column and the steel beam. A seismic isolation device supporting the above, a first fireproof coating provided around the joint, a second fireproof coating surrounding the seismic isolation device, and a steel beam outside the first fireproof coating. It is a fireproof structure having a third fireproof coating portion for fireproof coating.

In the invention of the first aspect, the first fireproof coating provided around the joint suppresses the ingress of heat from the outside of the first fireproof coating to the joint in the event of a fire, and the seismic isolation device is provided through the joint. Reduce the heat transferred.

In addition, the third fire-resistant coating that fire-resistant the steel beam suppresses the temperature rise of the steel beam in the event of a fire, thereby reducing the heat transferred from the steel beam to the joint and transmitting it to the seismic isolation device through the joint. Reduce the heat generated.

Further, the second fireproof coating portion surrounding the seismic isolation device suppresses heat from entering the seismic isolation device from the outside of the second fireproof coating portion in the event of a fire.

As a result, it is possible to reduce the deterioration of the fire resistance of the seismic isolation device due to the heat transferred to the seismic isolation device through the joint between the upper column or the lower column and the steel frame beam in the event of a fire.

In the invention of the second aspect, in the fireproof structure of the first aspect, a concrete slab is provided on the steel beam.

In the invention of the second aspect, the concrete slab can absorb the heat of the steel beam and the joint, and the heat transferred to the seismic isolation device through the joint can be further reduced.

In the invention of the third aspect, in the fireproof structure of the first or second aspect, the steel beam around the joint is provided with the heat absorbing means.

In the invention of the third aspect, the heat absorbing means absorbs the heat of the steel beam around the joint, so that the heat transferred to the seismic isolation device through the joint can be further reduced.

Since the present invention has the above configuration, it is possible to reduce the deterioration of the fire resistance of the seismic isolation device due to the heat transferred to the seismic isolation device through the joint between the column and the steel beam in the event of a fire.

It is a front sectional view which shows the fireproof structure which concerns on embodiment of this invention. FIG. 1 is a sectional view taken along the line AA of FIG. It is BB sectional view of FIG. It is a perspective view which shows the heat absorption means which concerns on embodiment of this invention. It is a perspective view which shows the tubular member and the beam which concerns on embodiment of this invention. It is a perspective view which shows the tubular member and the beam which concerns on embodiment of this invention. It is a perspective view which shows the heat absorption means which concerns on embodiment of this invention.

An embodiment of the present invention will be described with reference to the drawings. First, the fireproof structure according to the embodiment of the present invention will be described.

As shown in the front sectional view of FIG. 1, FIG. 2 which is the AA sectional view of FIG. 1, and FIG. 3 which is the BB sectional view of FIG. 1, the fireproof structure 10 of the present embodiment has a lower column 12 It is configured to include an upper column 14, a beam 16 as a steel beam, a seismic isolation device 18, a first fireproof coating portion 20, a second fireproof coating portion 22, and a third fireproof coating portion 24.

The lower column 12 is a reinforced concrete column formed in a square column, and the upper column 14 is a steel frame column made of a square steel pipe. The beam 16 is a steel-framed beam made of H-shaped steel, and is arranged radially from the upper column 14 in all directions in a plan view, and its end is joined to the side surface of the upper column 14 by welding. ..

A floor slab 26 formed of reinforced concrete as a concrete slab is provided on the beam 16.

The seismic isolation device 18 is made of laminated rubber bearings and is installed above the lower pillar 12. Further, the seismic isolation device 18 supports a joint portion 28 (lower end portion of the upper pillar 14) as a joint portion between the upper pillar 14 and the beam 16. That is, the seismic isolation device 18 is a seismic isolation device constituting the middle layer seismic isolation of the building.

The first fireproof coating portion 20 is composed of a coating plate member 30 made of a calcium silicate plate, and is provided around the joint portion 28. The covering plate member 30 is fixed to the lower surface of the floor slab 26 and suspended by using a mounting member (not shown) such as an angle member.

The second fireproof coating portion 22 is formed of a lower portion 32 of the coating plate member 30 and a calcium silicate plate, and is fixed and erected on the upper surface of the lower column 12 by using an attachment member (not shown) such as an angle member. It is composed of a plate member 34 and is provided so as to surround the seismic isolation device 18. A gap is formed between the lower surface of the covering plate member 30 (lower portion 32) and the upper surface of the covering plate member 34, whereby the covering plate member 30 (lower portion 32) and the covering plate member 34 are laterally connected to each other. It is possible to move relative to.

The third fireproof coating portion 24 is made of wet sprayed rock wool, and the outer peripheral surface of the beam 16 on the outside of the first fireproof coating portion 20 is fireproof coated. The end portion of the beam 16 (inside the first fireproof coating portion 20) near the joint portion 28 is not provided with a fireproof coating. As a result, the construction labor can be reduced and the construction cost can be reduced.

Next, the action and effect of the fireproof structure according to the embodiment of the present invention will be described.

In the fireproof structure 10 of the present embodiment, as shown in FIGS. 1 to 3, the first fireproof coating portion 20 provided around the joint portion 28 allows the joint portion from the outside of the first fireproof coating portion 20 in the event of a fire. The ingress of heat into the 28 is suppressed, and the heat transferred to the seismic isolation device 18 through the joint 28 is reduced.

Further, the third fireproof coating portion 24 that fireproofly covers the beam 16 suppresses the temperature rise of the beam 16 at the time of a fire, thereby reducing the heat transferred from the beam 16 to the joint portion 28, and the joint portion 28. The heat transferred to the seismic isolation device 18 is reduced through.

Further, the second fireproof coating portion 22 surrounding the seismic isolation device 18 suppresses heat from entering the seismic isolation device 18 from the outside of the second fireproof coating portion 22 in the event of a fire.

As a result, it is possible to reduce the decrease in fire resistance of the seismic isolation device 18 due to the heat transferred to the seismic isolation device 18 through the joint 28 in the event of a fire.

Further, in the fireproof structure 10 of the present embodiment, as shown in FIGS. 1 and 2, since the floor slab 26 is provided on the beam 16, the floor slab 26 heats the beam 16 and the joint 28. The heat that can be absorbed and transferred to the seismic isolation device 18 through the joint 28 can be further reduced.

Further, in the refractory structure 10 of the present embodiment, as shown in FIG. 1, the covering plate member 30 (lower part 32) and the covering plate member 34 are provided so as to be relatively movable in the lateral direction. Even if the pillar 12 and the joint 28 move relative to each other in the lateral direction, the second fireproof coating 22 can be kept intact.

The embodiment of the present invention has been described above.

In the present embodiment, as shown in FIG. 1, the seismic isolation device 18 installed above the lower column 12 made of reinforced concrete is used to connect the upper column 14 of the steel frame and the joint 28 of the beam 16 of the steel frame. Although an example of the supported configuration is shown, the lower column 12 can be a column having various structures such as a steel-framed column with a fireproof coating and a steel-framed reinforced concrete column.

Further, the upper column may be supported by a seismic isolation device installed above the joint (joint portion) between the steel-framed lower column and the steel-framed beam. In this case, the upper column can be a column having various structures such as a reinforced concrete column, a steel-framed column with fireproof coating, and a steel-framed reinforced concrete column.

Further, in the present embodiment, as shown in FIG. 1, an example in which the seismic isolation device 18 is a laminated rubber bearing is shown, but other bearings such as a high damping laminated rubber bearing, a laminated rubber bearing with a lead plug, and an elastic sliding bearing are shown. It may be a type of seismic isolation device.

Further, in the present embodiment, as shown in FIG. 1, an example in which the first fireproof coating portion 20 and the second fireproof coating portion 22 are composed of a calcium silicate plate is shown, but the first fireproof coating portion 20 is Anything that can suppress the ingress of heat from the outside of the first fireproof coating portion 20 into the joint portion 28 at the time of a fire and reduce the heat transferred to the seismic isolation device 18 through the joint portion 28 is sufficient. The second fireproof coating portion 22 may be any as long as it can suppress heat from entering the seismic isolation device 18 from the outside of the second fireproof coating portion 22 in the event of a fire. For example, the first refractory coating portion 20 and the second refractory coating portion 22 may be made of gypsum board, a dry board-shaped rock wool heat insulating material, or the like.

Further, in the present embodiment, as shown in FIG. 1, an example in which the third fireproof coating portion 24 is made of wet sprayed rock wool is shown, but the third fireproof coating portion 24 is a beam 16 in the event of a fire. Anything that can suppress the temperature rise will do. For example, the third fireproof coating portion 24 may be a dry rock wool sheet, a thermal expansion sheet, a calcium silicate board, a gypsum board, a fireproof paint, or the like.

Further, in the present embodiment, as shown in FIG. 1, an example is shown in which the outer peripheral surface of the beam 16 outside the first fireproof coating portion 20 is fireproof coated by the third fireproof coating portion 24, but the joint portion 28 is shown. A fireproof coating may be applied to the outer peripheral surface of the end portion (inside of the first fireproof coating portion 20) of the nearby beam 16. In this case, the fireproof coating applied to the beam 16 located inside the first fireproof coating portion 20 may be thinner than the fireproof coating applied to the beam 16 located outside the first fireproof coating portion 20. ..

Further, as shown in the perspective view of FIG. 4 and the perspective view of FIG. 7, heat absorbing means 36 and 44 are provided at the ends of the beams 16 located around the joint portion 28 (near the joint portion 28). May be good.

In FIG. 4, the heat absorbing means 36 is filled and hardened in a steel tubular member 38 made of a square steel pipe whose end is joined to the side surface of the joint 28 by welding or the like, and in the tubular member 38. It is composed of concrete 40 and the like. Further, the inside of the upper pillar 14 is also filled with concrete 42 and hardened.

As shown in the perspective view of FIG. 5, the upper and lower end surfaces of the tubular member 38 and the upper and lower flange end surfaces of the beam 16 are joined by welding, bolts, or the like, and one beam is formed by the tubular member 38 and the beam 16. It constitutes a member. That is, the heat absorbing means 36 is provided at the end of the beam member. As shown in the perspective view of FIG. 6, a reinforcing plate 46 may be provided in the tubular member 38 to increase the strength of the tubular member 38.

In FIG. 7, the heat absorbing means 44 is made of steel made of a square steel pipe in which the heat absorbing means 44 is inserted and arranged in the beam 16 so as to surround the end portion of the beam 16, and the end portion is joined to the side surface of the joint portion 28 by welding or the like. The tubular member 38 and the concrete 40 which is filled and hardened in the tubular member 38 to integrate the end portion of the beam 16 and the tubular member 38 are configured. Further, the inside of the upper pillar 14 is also filled with concrete 42 and hardened.

With such a configuration, the heat absorbing means 36 and 44 absorb the heat of the beam 16 around the joint 28, and the concrete 42 absorbs the heat of the joint 28 through the joint 28. The heat transferred to the seismic isolation device 18 can be further reduced. Further, the tubular member 38 can be used as a jack receiver for the lifting jack used when replacing the seismic isolation device 18.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

10 Fireproof structure 12 Lower column 14 Upper column 16 Beam (steel beam)
18 Seismic isolation device 20 1st fireproof coating 22 2nd fireproof coating 24 3rd fireproof coating 26 Floor slab 28 Joint (joint)
36, 44 Endothermic means

Claims (4)

With the lower pillar
A seismic isolation device installed above the lower column to support the joint between the upper column and the steel beam, or installed above the joint between the lower column and the steel beam to support the upper column.
The floor slab provided on the steel beam and
A first fireproof coating suspended from the floor slab and provided around the joint,
A second fireproof coating that surrounds the seismic isolation device like a wall and has a lower or upper portion that is relatively movable with respect to the first fireproof coating .
A third fireproof coating that fireproofly coats the steel beam outside the first fireproof coating, and a third fireproof coating.
Fireproof structure with. The floor slabs, refractory structure according to claim 1 which is a concrete slab. The fireproof structure according to claim 1 or 2, wherein the steel beam around the joint is provided with heat absorbing means. The steel beam inside the first fireproof coating portion is not provided with a fireproof coating, or is provided with a fireproof coating having a thickness thinner than the thickness of the third fireproof coating portion. The fireproof structure according to 2.

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