JPH10266400A - Fire resistant covering structure of base-isolated device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To follow mutual displacement of axial load material at the time of earth quake and surely hold fire resistant covering thickness by mutually slidably and verti cally laminating a plurality of annular fire resistant covering materials through an air layer on the outer periphery of a baseisolated device inserted in the axial load material. SOLUTION: A base-isolated device composed of laminating rubber and the like is fixed between the upper and lower parts 10a, 10b of a prism 10 through upper and lower flanges 12a, 12b by bolts 13, and the end of the upper and lower parts 10a, 10b are covered by an angular fire resistant covering material 14. A plurality of circular plate-like fire resistant covering materials 15 are mutually slidably vertically laminated through a slip material such as a teflon sheet, a constant interval is held by spacers 17 and the base-isolated device is covered. Thus, in the case where mutual displacement occurs between the upper and lower parts 10a, 10b of the square column 10 at the time of earthquake, each fire resistant covering material 15 smoothly slides, follows movement of the base-isolated device 12, and a constant air layer S can be held between the outer peripheral part of the base-isolated device 12 and the inner peripheral part of the fire resistant covering material 15 by the spacers 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof structure surrounding a seismic isolation device interposed between axial members such as columns in a seismic isolation building.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for imparting seismic isolation to various types of buildings, and accordingly, there have been demands for a base portion of a building (axial member), a column head of a specific level (axial member), a middle or a column base. A seismic isolation method in which vibrations that propagate from the ground to the building or between floors are insulated by interposing a seismic isolation device made of rubber, laminated rubber, etc., and the stress and deformation generated in the building frame are suppressed. Are often adopted. In a base-isolated building with a seismic isolation device installed in this way, if the seismic isolation device is damaged by a fire, the bearing of the axial force is impaired and the existence of the frame itself is jeopardized. It is necessary to provide fire resistance by coating with a refractory material.

[0003] By the way, such a fireproof covering structure of the seismic isolation device is not only capable of protecting the seismic isolation device from fire because of its own fire resistance, but also has a structure between the upper and lower parts generated during an earthquake. The seismic isolation device can smoothly follow the relative displacement, and the seismic isolation device is mainly made of rubber, so that the seismic isolation device can be inspected periodically because deterioration over time is inevitable. Is required. Therefore,
As the conventional fireproof covering structure, as shown in FIG. 6, a seismic isolation device 2 interposed between upper and lower portions 1a and 1b of a column 1 is interposed with a required air layer S functioning as a heat insulating layer. A sheet-like refractory covering material 3 is practically used in which it is surrounded with some slack so as to be deformable, and upper and lower ends thereof are fixed to upper and lower portions 1a and 1b of the column 1, respectively. I have.

According to the fireproof covering structure of the seismic isolation device 2 having the above configuration, as shown in FIG. 7, when a relative displacement occurs between the upper and lower portions 1a and 1b of the column 1 during an earthquake, a sheet-like structure is formed. This can be followed by the deformation of the fireproof covering material 3 and, as shown in FIG. There is an advantage that a certain air layer S functioning as a heat insulating layer can be maintained.

[0005]

However, in the above-mentioned conventional fireproof covering structure of the seismic isolation device, when the seismic isolation device 2 is inspected, the fireproof covering material 3 must be removed every time. There has been a problem that the work is extremely large and requires a great deal of labor. In addition, since the sheet-like refractory covering material 3 needs to be attached to the periphery of the seismic isolation device 2 with a slack so as to be deformable, it is particularly applied to a middle-layer seismic isolation device having an external appearance. In that case, there was also a problem that the appearance of the design was poor.

Therefore, as another conventional fireproof coating structure,
As shown in FIG. 9, the seismic isolation device 2 interposed between the upper and lower portions 1a and 1b of the column 1 is divided into a plurality of ring-shaped fireproof coatings with a required air layer S interposed therebetween. It is known that the members 5 are slidably laid on each other so as to be slidable one over the other and surrounded. According to such a fire-resistant coating structure, since the outer shape of the fire-resistant coating material 5 can be adjusted to a shape continuous with the upper and lower portions 1a and 1b of the column 1, the appearance is excellent even when applied to a middle layer seismic isolation or the like. And upper and lower parts 1a, 1 generated during an earthquake
As shown in FIG. 10, there is an advantage that the refractory coating 5 can follow the relative displacement of b by sliding in the horizontal direction.

However, since the fireproof structure of the seismic isolation device follows the relative displacement during the earthquake by sliding between the fireproof materials 5, as shown in FIG. Sometimes, the state in which the refractory coating materials 5 are shifted from each other remains even after the earthquake. For this reason, it is possible to maintain a uniform and required refractory coating thickness (the contact length between the refractory coating materials 5 between the outside and the air layer S) between the refractory coating materials 5 over the entire circumference of the seismic isolation device 2. In addition, there are many places where the air layer S that contributes to the fire resistance performance cannot be obtained as a heat insulating layer, so that the risk of fire is extremely high. Therefore, it is necessary to ensure the fire resistance of the seismic isolation device 2. After the required earthquake, there was a problem that the expected fire resistance performance could not be exhibited satisfactorily. In addition, since it is necessary to manually realign the refractory coating material 5 after the earthquake, there is a problem that such work also requires much labor.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the conventional fireproofing structure of a seismic isolation device, and has excellent followability with respect to relative displacement during an earthquake, and has a structure which is capable of being used after an earthquake. It is another object of the present invention to provide a fire-resistant coating structure of a seismic isolation device which can reliably maintain a required thickness of a fire-resistant coating between the fire-resistant coating materials and has excellent fire resistance performance.

[0009]

According to a first aspect of the present invention, there is provided a fireproofing structure for a seismic isolation device according to the present invention, wherein an air layer is interposed between an outer periphery of the seismic isolation device and an axial force member. Surrounding the seismic isolation device by laminating a plurality of divided annular fireproof covering materials slidably in the vertical direction, and on the inner peripheral portion of the fireproof covering material and on the outer periphery of the seismic isolator facing the same. It is characterized in that a spacer protruding toward is provided.

Here, the invention according to claim 2 is characterized in that the fireproof covering material according to claim 1 is provided with an inspection port which can be opened and closed, and further according to claim 3. The invention is characterized in that the refractory covering material is formed in an annular plate shape, and a sliding material for reducing a frictional force is interposed on each sliding surface.

According to the fire-resistant coating structure according to any one of claims 1 to 3, the outer periphery of the seismic isolation device is surrounded by a plurality of slidable annular fire-resistant coating materials via an air space. Therefore, the refractory coatings follow the relative displacement between the upper and lower portions of the axial force member caused by the earthquake by sliding each other. At this time, since the spacer protruding toward the outer periphery of the opposing seismic isolation device is provided on the inner peripheral portion of the fireproof coating material, when the seismic isolation device is restored to the original state after the earthquake, the fireproof coating material is used. In order to restore the original state by being aligned along the outer peripheral surface of the seismic isolation device via the above spacer, the required fireproof coating thickness is always provided over the entire circumference between the vertically adjacent fireproof coating materials. A substantially uniform air layer can be maintained between the fireproof covering material and the seismic isolation device. As a result, even after an earthquake with the highest risk of fire, desired fire resistance performance can be reliably exhibited. In addition, since the spacer can maintain a sufficient thickness of the refractory coating between the refractory coatings even after the earthquake, the width of the ring is set smaller than that of the related art, and the entire refractory coating is set. Even when the size is reduced, it is possible to always obtain sufficient fire resistance.

Further, according to the second aspect of the present invention, since the fireproof covering materials that are slidable with each other are provided with the inspection opening that can be opened and closed, the inspection opening of the fireproof covering material is opened, and this is opened. By rotating in the circumferential direction, the inspection can be performed over the entire circumference of the seismic isolation device without removing all the fireproof covering materials. At this time, since the spacer is provided on the inner peripheral portion of the fire-resistant coating material, the spacer guides the fire-resistant coating material along the outer periphery of the seismic isolation device, so that the fire-resistant coating material can be smoothly rotated. Can be moved.

Further, according to the third aspect of the present invention, since the sliding material for reducing the frictional force is interposed between the sliding surfaces of the refractory coating materials, the above-described follow-up property at the time of the above-mentioned earthquake is provided. Is further improved, and in combination with the effect of providing the spacer, restoration after an earthquake is performed more smoothly, so that fire resistance can be more reliably maintained. Also, at the time of inspection, since the refractory coating can be rotated with a small force, the work is further facilitated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show an embodiment in which a fireproof structure of a seismic isolation device according to the present invention is applied around a seismic isolation device interposed in a prism (axial member). Things. 1 to 3, reference numeral 10 denotes a prism 10, and a plate 11 installed on upper and lower portions 10 a and 1 b of the prism 10.
The upper and lower flanges 12a and 12b of the seismic isolation device 12 made of laminated rubber or the like are fixed by bolts 13, respectively. Then, a rectangular refractory covering material 14 is fixed to the outer periphery of the plate 11. The refractory coating material 14 is a plate-like member formed of a refractory material such as a calcium silicate plate or a gypsum molded plate. At four corners, a partially removable opening / closing portion 14a is formed. By removing the portion 14a, the upper and lower flanges 12 of the seismic isolation device 12 are removed.
An inspection opening for inspecting the portions a and 12b and the bolts 13 for mounting the same is formed. Between the upper and lower rectangular refractory coatings 14, a plurality of ring-shaped refractory coatings 15 are vertically slidably stacked on each other.

The refractory coating material 15 is formed of the same refractory material as the refractory coating material 14, and is provided between the outer periphery of the seismic isolation device 12 and an air layer S having a predetermined thickness. 12 are arranged. Here, the width dimension of the refractory coating material 15 in the radial direction is equal to that of the adjacent refractory coating material 1.
5 is set to a dimension that ensures a required thickness of the refractory coating, and a sliding material 16 such as a Teflon sheet for reducing frictional force is provided on the sliding surfaces of the respective refractory coatings 15. Interposed or coated. A plurality of spacers 17 projecting toward the outer periphery of the opposing seismic isolation device 12 are provided on the inner peripheral portion of each refractory coating material 15 at a plurality of locations (eight locations in the figure) at equal intervals in the circumferential direction. Mounted on As shown in FIG. 2, the spacer 17 is a hollow member formed of a material having a predetermined elasticity such as hard rubber, and is provided with a fireproof coating at a slight distance from the outer peripheral surface 12c of the seismic isolation device 12. A screw 18 is attached to the inner peripheral surface of the member 15. The spacer 17 may be fixed to the inner peripheral surface of the refractory coating 15 by bonding instead of the screw 18.

At a predetermined position of each of the refractory coatings 15, an opening / closing portion 15a from which a part of the refractory coating 15 can be removed by a cutting portion 19 is formed. The inspection opening is formed by removing the opening / closing portion 15a when performing the operation. In addition,
The opening / closing portion 15a may be provided so as to be openable and closable by a hinge disposed so as to straddle the cutting portion 19 on one side thereof. Further, a reinforcing member 20 is provided on the inner peripheral surface of the fireproof covering member 15 so as to straddle the opening / closing portion 15a.

Next, the seismic isolation device 12 having the above configuration
The function of the refractory coating structure of the first embodiment will be described. First, in the above-mentioned fire-resistant coating structure, the outer periphery of the seismic isolation device 12 is surrounded by a plurality of annular plate-shaped fire-resistant coating materials 15 slidable to each other with an air layer S interposed therebetween. Lumber 15
As shown in FIG. 4, when a relative displacement occurs between the upper and lower portions 10 a and 10 b of the prism 10 during the earthquake, each of the refractory coating materials 15 Follow this by sliding smoothly. At this time, since the spacers 17 projecting toward the outer periphery of the opposing seismic isolation device 12 are provided at a plurality of circumferential locations on the inner peripheral surface of the fireproof covering material 15, the spacers 17 are always used by these spacers 17. The seismic isolation device 12 follows the movement of the seismic isolation device 12 while maintaining a constant air layer S between the outer peripheral surface of the base 12 and the inner peripheral surface of the refractory coating material 15.

Next, as shown in FIG. 5, when the seismic isolation device 12 is restored to the original state after the earthquake, the fireproof covering material 15 similarly follows the outer peripheral surface of the seismic isolation device 12 via the spacer 17. To restore the original state. Thus, according to the fireproof structure of the seismic isolation device 12,
The required refractory coating thickness can be ensured because a large displacement does not occur between the vertically adjacent refractory coatings 15 and thus a sufficient contact length is always obtained over the entire circumference of the refractory coating 15. At the same time, a substantially uniform air layer S is always formed all around the seismic isolation device 12. Therefore,
Even after an earthquake that has the highest risk of fire, desired fire resistance performance can be reliably exhibited. Further, since a large refractory coating thickness can always be maintained between the refractory coating materials 15, the width of the refractory coating material 15 in the radial direction can be set to be relatively small as compared with the conventional one. Therefore, it is possible to reduce the size and weight of the entire refractory coating.

When the condition of the seismic isolation device 12 is regularly inspected, the opening / closing portion 15a of each refractory covering material 15 is removed, so that the inspection extends vertically on the side surface of the refractory covering material 15. An opening is formed, and the interior seismic isolation device 12 can be inspected from the inspection opening. At this time, if the inspection port is turned in the circumferential direction, the fireproof coating material 15 is guided along the outer periphery of the seismic isolation device 12 by the spacer 17 and is smoothly rotated by the sliding material 16. Seismic device 1
2 can be inspected over the entire circumference. In addition, since the reinforcing member 20 is provided on the inner peripheral surface of the fireproof covering material 15 across the inspection port, the annular shape of the fireproof covering material 15 is maintained even after the opening / closing portion 15a is removed. be able to. Further, by removing the opening / closing portions 14a at the four corners of the rectangular fireproof covering material 14, the upper and lower flanges 12 of the seismic isolation device 12 can be opened from the inspection openings formed at the four corners.
It is possible to check the mounting state of the parts a and 12b and the mounting bolts 13 thereof.

In the above embodiment, the seismic isolation device 1 is provided by the plurality of refractory covering members 15 formed in a ring shape.
Although the description has been given only of the case where the surrounding area 2 is surrounded, the present invention is not limited to this, and the same operation and effect can be obtained even if the fire-resistant coating material 15 is formed in a polygonal ring shape. Regarding the arrangement of the spacer 17,
It is preferable to arrange at equal intervals in the circumferential direction,
The number can be appropriately selected according to the dimensions of the pillar. Furthermore, in the above-described embodiment, the case where the fireproof structure of the seismic isolation device according to the present invention is applied to the fireproof structure of the seismic isolation device 12 interposed in the prism 10 has been described, but is not limited thereto. Instead, the present invention can be similarly applied to a cylinder, and in this case, all of the plurality of fireproof covering materials surrounding the seismic isolation device may be formed in an annular shape.

[0021]

As described above, according to the fireproof covering structure according to any one of claims 1 to 3, the inner periphery of the fireproof covering material projects toward the outer periphery of the seismic isolation device facing the same. Because the spacers are provided, when the seismic isolation device is restored to the original state after the earthquake, the fireproof covering material is also aligned along the outer peripheral surface of the seismic isolation device via the spacers, thereby returning to the original state. In order to restore, the required fireproof coating thickness can always be secured between the upper and lower adjacent fireproof coating materials, and a substantially uniform air layer can be maintained over the entire circumference of the seismic isolation device, so that the most fire occurs Even after a highly dangerous earthquake, the desired fire resistance performance can be reliably exhibited.
In addition, between the refractory coating materials, since it is possible to always maintain a large refractory coating thickness, the radial width of the refractory coating material can be set relatively small as compared with the conventional one, Therefore, it is also possible to reduce the size and weight of the entire refractory coating.

In particular, according to the second aspect of the present invention, by opening the inspection port of the fireproof covering material and rotating it in the circumferential direction, the seismic isolation can be performed without removing all the fireproof covering material. Inspection can be performed over the entire circumference of the device. Further, according to the invention described in claim 3, the following ability at the time of the above-mentioned earthquake is further improved by the slip material, and the effect of providing the spacer is combined. In addition, since the restoration after the earthquake is performed more smoothly, it is possible to more reliably maintain the fire resistance performance, and also, at the time of inspection, the fire-resistant coating material can be rotated with a small force. And the effect that the work is further facilitated is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a fireproof covering structure of a seismic isolation device of the present invention.

FIG. 2 is an enlarged vertical sectional view of a spacer mounting portion of FIG.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a side view showing a deformation state at the time of the earthquake of FIG. 3;

FIG. 5 is a side view showing a restored state after the earthquake of FIG. 4;

FIG. 6 is a side view showing a fireproof covering structure of a conventional seismic isolation device.

FIG. 7 is a side view showing a deformation state at the time of the earthquake of FIG. 6;

FIG. 8 is a side view showing a restored state after the earthquake of FIG. 7;

FIG. 9 is a side view showing a fireproof covering structure of another conventional seismic isolation device.

FIG. 10 is a side view showing a deformation state at the time of the earthquake of FIG. 9;

FIG. 11 is a side view showing the state after the earthquake of FIG. 10;

[Description of Signs] 10 prism (axial force member) 10a upper part of prism 10b lower part of prism 12 seismic isolation device 14 square fireproof coating material 15 annular fireproof coating material 14a, 15a opening / closing part 16 sliding material 17 spacer

Claims (3)

[Claims] 1. An outer periphery of a seismic isolation device interposed in an axial force member,
Surrounding the seismic isolation device by laminating a plurality of annular refractory coating materials slidably over each other with an air layer interposed therebetween, and on the inner peripheral portion of the refractory coating material,
A fireproof covering structure for a seismic isolation device, comprising a spacer protruding toward the outer periphery of the opposing seismic isolation device. 2. The fire-resistant covering structure of the seismic isolation device according to claim 1, wherein the fire-resistant covering material is provided with an inspection port that can be opened and closed. 3. The refractory covering material is formed in an annular plate shape, and a sliding material for reducing frictional force is interposed on sliding surfaces of each other. The fire-resistant covering structure of the seismic isolation device according to the above.