JP4956377B2 - Seismic isolation structure - Google Patents

Description

  The present invention relates to a seismic isolation structure including a fireproof coating material.

  Buildings with seismic isolation structures that have installed seismic isolation devices on the foundations and intermediate floors to increase the safety against earthquakes have become widespread. Seismic isolation devices include those using laminated rubber bearings in which rubber and steel plates are laminated, and those constructed by combining a sliding bearing and a sliding plate. In particular, in the middle floor seismic isolation system with a seismic isolation mechanism on the middle floor of the building, the seismic isolation device is a structural member that supports the load of the building, so that the strength does not decrease due to the heat of the fire, It is obliged by the Building Standards Law to take fire prevention measures for seismic isolation devices to ensure the prescribed fire resistance.

Examples of seismic isolation devices with fire prevention measures include the following.
Patent Document 1 describes a seismic isolation device in which a laminated rubber support is surrounded by a cylindrical fireproof blanket and upper and lower ends are screwed to a base plate of the laminated rubber support.
In Patent Document 2, a refractory plate is projected from the upper and lower columns so as to surround the seismic isolation device in a square shape, and a refractory gasket is installed between the upper and lower refractory plates to provide a seismic isolation slit. The formed seismic isolation device is described.
Japanese Utility Model Publication No. 5-3520 (paragraphs 0012-0014, FIG. 1) Japanese Patent No. 329849 (paragraphs 0020-0021, FIG. 1)

FIG. 5 is a view showing an example of a seismic isolation structure including a fireproof covering material.
As shown in FIG. 5 (a), the seismic isolation structure 100 includes a building foundation 101, a building housing 102 installed on the foundation 101 via a seismic isolation device 105, and fixed to the housing 102. A sheet-shaped fireproof covering material 104 that slides on the top and a wall 103 provided on the foundation 101 are provided.
The seismic isolation device 105 includes a sliding plate 105a fixed to the foundation 101 and a sliding support 105b fixed to the housing 102 and moving on the sliding plate 105a.
The periphery of the sliding support 105 b is surrounded by a fireproof board 106 that is suspended from the housing 102, and a sheet-like fireproof covering material 104 is fixed to the lower end of the fireproof board 106. The fireproof covering material 104 covers the sliding plate 105a located outside the fireproof board 106, and slides on the foundation 101 as the casing 102 moves.

In such a seismic isolation structure 100, as shown in FIG. 5B, when a relative displacement occurs between the foundation 101 of the building and the housing 102 due to an earthquake or the like, the fireproof covering material 104 fixed to the housing 102 is formed. In some cases, the wall body 103 provided on the foundation 101 hits against the wall body 103, and the fireproof covering material 104 may undergo compression deformation (for example, bellows-like deformation).
As shown in FIG. 5C, when the shaking is stopped and the foundation 101 and the casing 102 are restored to the normal positional relationship, if compressive deformation remains in the fireproof covering material 104, for example, a sliding plate 105a There was a problem that a part of was exposed, and sufficient fireproof performance could not be exhibited. Further, in the conventional seismic isolation structure, it is necessary to perform inspection / recovery work (maintenance work) of the fireproof covering material 104 after the earthquake so that such a situation does not occur.

  The present invention has been made to solve such a problem, and an object thereof is to provide a seismic isolation structure in which residual deformation hardly occurs in a fireproof coating material.

  The seismic isolation structure of the present invention includes a first structure, a second structure installed in the first structure via a seismic isolation device, and fixed to the second structure. A sheet-like fireproof covering material that slides on the upper surface, and a third structure provided on the upper surface of the first structure, and is formed by the first structure and the third structure. The corner is provided with an inclination means for inclining the fireproof covering material away from the first structure as it approaches the third structure.

According to this configuration, the fireproof coating material is inclined so as to move away from the first structure as approaching the third structure, at the corner formed by the first structure and the third structure. Since the tilting means is provided, when the fireproof coating material approaches the third structure, the tilting means tilts the fireproof coating material away from the upper surface of the first structure. That is, the angle difference between the fireproof covering material and the third structure is reduced. Therefore, the end portion of the fireproof coating material does not hit the third structure, and the compressive force hardly acts on the fireproof coating material. As a result, it becomes difficult for compressive deformation to occur in the fireproof coating material.
Further, when the fireproof coating material is separated from the tilting means, the end portion of the fireproof coating material that is tilted (lifted) along the tilting means is gradually lowered by its own weight and returned to its original state, so that maintenance work is not required. .

  Moreover, it is preferable that the said inclination means is provided with the inclined surface where the inclination angle with respect to the upper surface of a 1st structure increases as it approaches a 3rd structure.

  If comprised in this way, when a fireproof coating material approaches a 3rd structure, the edge part by the side of the 3rd structure of a fireproof coating material will be inclined (curved) gradually upward along the inclination means. . Therefore, since the fireproof coating material can be bent without difficulty, it is possible to more reliably prevent the compressive force from acting on the fireproof coating material.

  Moreover, it is preferable that the seismic isolation structure of the present invention has a structure in which a weight is installed on the fireproof covering material.

  According to such a configuration, since the weight is installed on the fireproof covering material, the fireproof material inclined upward by the inclination means when the first structure and the second structure return to the normal positional relationship. The covering material is pushed downward by the weight of the weight. Therefore, the fireproof coating material is easy to return to the original, and residual deformation hardly occurs.

  Moreover, it is preferable that the said fireproof covering material has a hard bone for resisting compression deformation.

  According to such a configuration, since the fireproof coating material has the strength for resisting compression deformation, the rigidity of the fireproof coating material is improved, and when the fireproof coating material comes into contact with the third structure, Compressive deformation hardly occurs.

  According to the present invention, it is possible to provide a seismic isolation structure in which residual deformation hardly occurs in the fireproof coating material.

The best mode for carrying out the present invention will be described in detail with reference to the drawings. In the present embodiment, a seismic isolation device having a fireproof covering structure according to the present invention will be described as an example. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a side view showing a seismic isolation structure according to the present embodiment.

As shown in FIG. 1, the seismic isolation structure 1 which concerns on this embodiment is comprised so that the middle floor of a building may be isolated. The seismic isolation structure 1 includes a floor slab 2, a footing 3 provided on the floor slab 2, a sliding plate 4 installed on the upper surface of the footing 3, and a sliding installed on the sliding plate 4. A support 5, a square column 6 erected on the slide support 5, a floor slab 7 on the upper floor supported by the square column 6, a fire-resistant board 8 surrounding the slide support 5, and a slide plate 4 Inclining means 11 provided at a corner 13 formed by a sheet-like fireproof covering material 9 covering the upper surface, a wall body 10 erected on the floor slab 2, and the footing 3 and the wall body 10. And mainly.
In the present embodiment, the floor slab 2 and the footing 3 correspond to the “first structure” in the claims, and the quadrangular column 6 and the floor slab 7 in the claims “the second structure”. The wall 10 corresponds to a “third structure” in the claims. Further, the sliding plate 4 and the sliding support 5 correspond to a “seismic isolation device” in the claims.

  The floor slab 2 is a member constituting the floor surface of the floor on which the sliding plate 4 and the sliding support 5 (hereinafter sometimes referred to as “seismic isolation device 12” in some cases) are installed. The footing 3 is a member serving as a basis for fixing the sliding plate 4. The floor slab 2 and the footing 3 are constructed of, for example, reinforced concrete.

  The sliding plate 4 is a member that reduces building response acceleration due to an earthquake by abutting against a sliding bearing 5 to be described later and sliding the sliding bearing 5. The sliding plate 4 is made of, for example, a stainless steel plate having a square shape in plan view. The upper surface of the sliding plate 4 is finished smoothly so that the sliding bearing 5 can slide well. Further, the sliding plate 4 is formed in a planar dimension corresponding to the moving range of the sliding support 5. In this embodiment, the sliding plate 4 is formed to have a planar dimension obtained by adding twice the maximum displacement of the sliding support 5 to the diameter of the sliding support 5. The sliding plate 4 is horizontally fixed in a state where it is embedded in the upper end of the footing 3 so that the lower surface of the sliding support 5 and the upper surface of the sliding plate 4 are parallel to each other.

  The sliding plate 4 is not limited to a stainless steel plate having a surface finish. For example, a stainless steel plate having a fluorine coating on the upper surface of the sliding plate 4 so that sliding of the sliding support 5 is further improved. May be used. Further, a plate material other than the stainless steel plate may be used. Further, the sliding plate 4 is not limited to a rectangular shape in plan view, and may be configured in a polygonal shape such as a pentagon or a hexagon or a circular shape. In addition, the plane dimension of the sliding plate 4 is more preferably a plane dimension obtained by adding at least twice the maximum displacement of the sliding bearing 5 to the diameter of the sliding bearing 5 in consideration of an emergency.

  The sliding bearing 5 is a member that reduces building response acceleration due to an earthquake by sliding on the sliding plate 4. The sliding bearing 5 is composed of a rigid sliding bearing having a cylindrical shape. Further, a sliding material such as polytetrafluoroethylene (PTFE) is coated on the lower end portion of the sliding bearing 5 in order to improve sliding. The sliding bearing 5 is fixed to the lower end portion of the quadrangular column 6.

  Note that the sliding bearing 5 is not limited to the rigid sliding bearing. For example, an elastic sliding bearing in which seismic isolation rubber is laminated on the rigid sliding bearing may be used. The sliding material is not limited to polytetrafluoroethylene (PTFE), and polyamide, ultrahigh molecular weight polyethylene, or the like may be used. Further, the sliding bearing 5 is not limited to a cylindrical shape, and may be configured in any cross-sectional shape such as a prismatic shape.

  The quadrangular pillar 6 is a pillar having a quadrangular sectional view that supports the floor slab 7 on the upper floor, and is erected on the sliding support 5. That is, the square pillar 6 is edge-cut with respect to the floor slab 2 and the footing 3. The floor slab 7 is a member constituting the ceiling surface of the floor where the seismic isolation device 12 is installed and the floor surface of the upper floor. The floor slab 7 is fixed to the upper end of the quadrangular column 6. Thereby, the square pillar 6 and the floor slab 7 are configured to be movable relative to the floor slab 2 and the footing 3 in the horizontal direction.

  The fireproof board 8 is a member for surrounding and insulating the periphery of the sliding support 5. Each fireproof board 8 is made of, for example, a lightweight cellular concrete panel, and the heat of the fire is hardly transmitted to the inside due to the heat insulating effect of the encapsulated bubbles. In the present embodiment, four refractory boards 8 are arranged along each side surface of the quadrangular column 6. The upper part of each refractory board 8 is superimposed on each side surface of the quadrangular column 6, and the lower part of each refractory board 8 protrudes from the lower end of the quadrangular column 6 and surrounds the periphery of the sliding support 5. The lower end portion of each refractory board 8 is separated from the sliding plate 4 fixed to the footing 3. The method of attaching the fireproof board 8 to the quadrangular column 6 is not particularly limited, and it is preferable that the fireproof board 8 is fixed via, for example, a bracket.

The fireproof covering material 9 is a sheet-like member for covering and insulating a portion of the upper surface of the sliding plate 4 located outside the fireproof board 8. The fireproof covering material 9 is a blanket-like (blanket-like) member woven with, for example, ceramic fibers or alumina fibers, and is excellent in fire resistance, heat insulation, and flexibility. The material of the fireproof covering material 9 is not particularly limited. For example, if the sheet is formed by packing a sheet-like ceramic blanket having a thickness of about 50 mm and a density of about 130 kg / m ³ with silica cloth, a desired material can be used. It is preferable because it has heat insulation performance and deformation performance. The end of the fireproof covering material 9 on the sliding support 5 side is fixed to the lower end of the fireproof board 8 and closes the gap between the slide plate 4 and the lower end of the fireproof board 8. The end of the fireproof covering material 9 opposite to the sliding support 5 extends to at least the same position as the end of the sliding plate 4.

  On the fireproof covering material 9, a weight 91 for pressing down the fireproof covering material 9 curved upward by an inclination means 11 described later is placed. In the present embodiment, the weight 91 is made of, for example, the same sheet-shaped ceramic blanket as the fireproof covering material 9. The end of the weight 91 on the side opposite to the sliding support 5 protrudes beyond the end of the fireproof covering material 9 on the side opposite to the sliding support 5. In particular, when the weight 91 is made of the same material as the fireproof covering material 9, it is preferable that the protruding length of the weight 91 is about three times the thickness dimension of the fireproof covering material 9.

Further, in the fireproof covering material 9, a skeleton 92 is installed to resist compression deformation. The strength bone 92 is not particularly limited as long as it can improve the rigidity of the fireproof covering material 9, but for example, a metallic sheet-like member having an appropriate rigidity, an organic fiber, or an inorganic fiber It is made of a non-woven fabric made of steel. The rigidity of a metal sheet, organic / inorganic fiber nonwoven fabric, etc. can be adjusted by increasing / decreasing the thickness, for example.
In addition, the installation location of the strength frame 92 is not limited to the inside of the fireproof coating material 9 and may be the surface of the fireproof coating material 9 as long as the rigidity of the fireproof coating material 9 can be improved. .
In the present embodiment, the weight 91 and the strength frame 92 are installed only on the fireproof covering material 9 arranged on the wall body 10 side among the fireproof covering materials 9 provided around the fireproof board 8.

  The wall body 10 is a partition wall that partitions a space in which the seismic isolation device 12 is installed from another space. The wall body 10 is erected vertically along an end portion on one end side (right side in FIG. 1) of the footing 3. A gap is formed between the upper end of the wall 10 and the floor slab 7 on the upper floor. A refractory material 10 a is attached to the upper end of the wall body 10 to close the gap with the floor slab 7. That is, the wall 10 is configured to move integrally with the floor slab 2 and move relative to the floor slab 7 during an earthquake. The wall body 10 is provided at a position where the wall body 10 may come into contact with the fireproof covering material 9 when the wall body 10 moves relative to the floor slab 7.

The inclination means 11 is a member for bending the fireproof covering material 9 approaching the wall body 10 upward. The inclination means 11 is formed in the corner 13 formed by the footing 3 and the wall body 10 in the continuous direction (direction orthogonal to FIG. 1). The inclination means 11 has an arcuate curved surface (inclined surface) 11a having a central angle of 90 degrees. The tilting means 11 is constructed by, for example, placing concrete along the corner 13 and molding the surface into an arc shape.
The edge of the arcuate curved surface 11a on the lower end side is smoothly continuous with the upper surface of the horizontally formed footing 3. Moreover, the edge part of the upper end side of the circular-arc-shaped curved surface 11a is smoothly following the side surface of the wall 10 formed perpendicularly. In other words, the arcuate curved surface 11 a is formed such that the inclination angle with respect to the upper surface of the footing 3 increases as it approaches the wall body 10. The fireproof covering material 9 is curved upward along the curved surface 11a.
When the weight 91 is made of the same material as the fireproof covering material 9, the radius of the curved surface 11a of the tilting means 11 is twice the total of the thickness dimension of the fireproof covering material 9 and the thickness dimension of the weight 91. The above is preferable because residual deformation hardly occurs in the fireproof covering material 9.

  It continues and demonstrates operation | movement of the seismic isolation structure which concerns on this embodiment with reference to FIG. FIG. 2 is a partially enlarged side view for explaining the operation of the seismic isolation structure according to the present embodiment. (A) is a normal state, (b) is an earthquake, and (c) is a return state. Each is shown.

At a normal time before the occurrence of the earthquake, as shown in FIG. 2 (a), the sliding bearing 5 is positioned substantially at the center of the sliding plate 4. At this time, the fireproof covering material 9 appropriately covers the top of the sliding plate 4 located outside the fireproof board 8. The end of the fireproof covering material 9 on the wall 10 side is separated from the wall 10 and the tilting means 11.
Then, when an earthquake occurs and a horizontal force is input to the building, a relative displacement occurs between the sliding plate 4 and the sliding support 5, and the fireproof covering material fixed to the sliding support 5 via the square pillar 6 and the fireproof board 8. 9 moves so that it may approach the wall body 10 and the inclination means 11 which were fixed to the floor slab 2, sliding on the upper surface of the footing 3. FIG.

  When the fireproof covering material 9 moves so as to approach the wall body 10, the fireproof covering material 9 rides on the curved surface 11a of the tilting means 11, as shown in FIG. At this time, the edge of the curved surface 11a on the footing 3 side is smoothly continuous with the upper surface of the footing 3, so that it does not collide with the end of the fireproof coating material 9, and a compressive force acts on the fireproof coating material 9. Hard to do. In addition, since the refractory covering material 9 is provided with a force frame 92 for resisting compression deformation, compression deformation is unlikely to occur.

  And the fireproof covering material 9 which got on the curved surface 11a of the inclination means 11 will curve along the shape of the curved surface 11a, as shown in FIG.2 (b). Since the curved surface 11 a is closer to the wall body 10, the inclination angle with respect to the upper surface of the footing 3 is larger. Therefore, the inclination angle of the fireproof covering material 9 is also larger as it is closer to the wall body 10. Therefore, when the fireproof covering material 9 is displaced to a position where it contacts the wall body 10, the inclination angle of the fireproof covering material 9 with respect to the upper surface of the footing 3 and the inclination angle of the side surface of the wall body 10 with respect to the upper surface of the footing 3 (this embodiment). The difference from 90 degrees becomes smaller. Therefore, the end portion of the fireproof covering material 9 comes into contact with the wall body 10, and the compressive force hardly acts on the fireproof covering material 9. As a result, it is possible to prevent the fireproof covering material 9 from being compressed and deformed.

  When the earthquake stops and the sliding plate 4 and the sliding support 5 return to the normal positional relationship, the fireproof covering material 9 is separated from the tilting means 11 and returns to the top of the sliding plate 4 as shown in FIG. . At this time, the fireproof covering material 9 bent upward by the tilting means 11 is pushed downward by the weight of the fireproof covering material 9 and the weight of the weight 91 installed thereon. Therefore, the sliding plate 4 is appropriately covered with the fireproof covering material 9. As a result, the maintenance work of the fireproof covering material 9 becomes unnecessary.

Next, the seismic isolation structure 1 ′ according to the second embodiment will be described with reference to FIG. In the description, the same elements as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
FIG. 3 is a side view showing the seismic isolation structure according to the second embodiment, where (a) shows a normal state and (b) shows a state at the time of an earthquake.
In a building in which the seismic isolation device 12 is installed, the wall body 21 that forms a vertically continuous space, such as the elevator shaft 20 shown in FIG. May be cut off. In the second embodiment, a case where the seismic isolation structure according to the present invention is applied to the wall body 21 of the elevator shaft 20 will be described.

The seismic isolation structure 1 ′ according to the second embodiment includes a floor slab 2 and a floor slab on the upper floor installed above the floor slab 2 via a seismic isolation device 12 as shown in FIG. 7, a wall body 21 whose upper end is fixed to the floor slab 7, a fireproof covering material 9 that is fixed to the lower end of the wall body 21 and slides on the floor slab 2, and the floor slab 2. The pit 23 and the inclination means 11 provided in the corner 24 formed by the floor slab 2 and the pit 23 are mainly provided.
In the second embodiment, the floor slab 2 corresponds to the “first structure” in the claims, the floor slab 7 and the wall body 21 correspond to the “second structure”, and the pit 23 corresponds to the “first structure”. It corresponds to “3 structures”. Incidentally, since the structure around the seismic isolation device 12 is the same as that of the first embodiment described above, detailed description thereof is omitted.

  The wall body 21 is a member constituting the peripheral wall of the elevator shaft 20. The wall body 21 is connected and fixed to the sliding bearing 5 side of the seismic isolation device 12 through the floor slab 7 and the square column 6. That is, the wall body 21 moves relative to the floor slab 2 fixed to the sliding plate 4 side via the footing 3. A fireproof covering material 9 is installed at the lower end of the wall body 21 and closes the gap between the floor slab 2 and the wall body 21. The fireproof covering material 9 is disposed on the opposite side of the elevator shaft 20 along the upper surface of the floor slab 2 so that the elevator shaft 20 and the floor space do not communicate with each other when the wall body 21 moves relative to the floor slab 2. It is extended. An elevator 22 is disposed inside the elevator shaft 20.

The pit 23 is a member provided on the floor slab 2. The pit 23 is provided at a position where the fireproof covering material 9 contacts when the wall body 21 moves relative to the floor slab 2.
Inclining means 11 are provided at the corners formed by the pits 23 and the floor slab 2.

The tilting means 11 is a member for bending the fireproof covering material 9 approaching the pit 23 upward. The tilting means 11 has an arcuate curved surface 11a having a central angle of 90 degrees.
The edge on the lower end side of the arcuate curved surface 11a is smoothly continuous with the upper surface of the horizontally formed floor slab 2. Further, the edge on the upper end side of the arcuate curved surface 11a is smoothly continuous with the side surface of the vertically formed pit 23. That is, the arcuate curved surface 11a is formed such that the closer to the pit 23, the greater the inclination angle with respect to the upper surface of the floor slab 2. The fireproof covering material 9 is curved upward along the curved surface 11a.

It continues and demonstrates operation | movement of the seismic isolation structure 1 'which concerns on 2nd Embodiment.
When an earthquake occurs and a horizontal force is input to the building, the wall body 21 moves relative to the floor slab 2 as shown in FIG. At this time, the fireproof covering material 9 fixed to the lower end of the wall body 21 also moves relative to the floor slab 2. When the wall body 21 and the fireproof covering material 9 move in a direction approaching the pit 23, the fireproof covering material 9 rides on the curved surface 11 a of the tilting means 11. At this time, the edge of the curved surface 11 a on the floor slab 2 side is smoothly continuous with the upper surface of the floor slab 2, so that it does not collide with the end of the fireproof coating material 9 and compresses the fireproof coating material 9. Is hard to act. In addition, since the refractory covering material 9 is provided with a force frame 92 for resisting compression deformation, compression deformation is unlikely to occur.

  And the fireproof covering material 9 which got on the curved surface 11a of the inclination means 11 will curve along the shape of the curved surface 11a, as shown in FIG.3 (b). Since the curved surface 11 a is closer to the pit 23, the inclination angle with respect to the upper surface of the floor slab 2 is larger, so the inclination angle of the fireproof covering material 9 is larger as the pit 23 is closer. Therefore, when the fireproof covering material 9 is displaced to a position where it contacts the pit 23, the inclination angle of the fireproof covering material 9 with respect to the upper surface of the floor slab 2 and the inclination angle of the side surface of the pit 23 with respect to the upper surface of the floor slab 2 (this embodiment). The difference from 90 degrees becomes smaller. Therefore, the end portion of the fireproof covering material 9 comes into contact with the pit 23, and the compressive force hardly acts on the fireproof covering material 9. As a result, it is possible to prevent the fireproof covering material 9 from being compressed and deformed.

  As mentioned above, although the best embodiment for implementing this invention was described in detail with reference to drawings, this invention is not limited to these embodiment, In the range which does not deviate from the main point of invention, it is appropriate. It goes without saying that changes are possible.

  For example, in the present embodiment, the curved surface 11a of the tilting means 11 is formed in an arc shape, but is not limited to this, and may be formed in a solenoid curved surface, a polygonal plane, or a single plane. As an example, as shown in FIG. 4 (a), an inclining means 15 having three inclined surfaces 15a, 15b, 15c whose inclination increases by 22.5 degrees as approaching the wall body 10 is provided. 13 may be formed. The angle difference between the upper surface and the inclined surface of the first structure and the angle difference between the side surface and the inclined surface of the third structure are preferably 45 degrees or less.

  In the present embodiment, the same sheet-like ceramic blanket as the fireproof covering material 9 is used as the weight 91, but the weight 91 is not limited to this. For example, as shown in FIG. 4B, the flat bars 93 and 93 may be installed near the end of the fireproof covering material 9 on the wall 10 side.

  In the present embodiment, a lightweight cellular concrete panel is used as the fireproof board 8. However, it goes without saying that any member may be used as long as it is a plate-like member having a predetermined fireproof insulation performance. Further, in this embodiment, the seismic isolation device including the sliding plate 4 and the sliding bearing 5 is used as the seismic isolation device 12, but the present invention is not limited to this. For example, other seismic isolation devices in which the first structure and the second structure are relatively moved in the horizontal direction, such as a so-called laminated rubber seismic isolation bearing and a rolling seismic isolation bearing, may be used.

It is the side view which showed the seismic isolation structure which concerns on this embodiment. It is a partially expanded side view for demonstrating operation | movement of the seismic isolation structure which concerns on this embodiment, (a) is normal time, (b) is the time of an earthquake, (c) has shown the state at the time of a return, respectively. . It is the side view which showed the seismic isolation structure which concerns on 2nd Embodiment, (a) is normal time, (b) has shown the state at the time of an earthquake. (A) is a side view which shows the modification of an inclination means, (b) is a side view which shows the modification of a weight. It is the figure which showed an example of the seismic isolation structure provided with a fireproof covering material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation structure 2 Floor slab 3 Footing 4 Sliding board 5 Sliding support 6 Square pillar 7 Floor slab 8 Fireproof board 9 Fireproof covering material 10 Wall body 11 Inclination means 12 Seismic isolation device 13 Corner of entry 91 Weight 92 Strength bone

Claims (4)

A first structure;
A second structure installed in the first structure via a seismic isolation device;
A sheet-like fireproof covering material fixed to the second structure and sliding on an upper surface of the first structure;
A third structure provided on an upper surface of the first structure,
Inclining means for inclining the fireproof coating material away from the first structure as it approaches the third structure is provided at a corner formed by the first structure and the third structure. Seismic isolation structure characterized by   2. The seismic isolation structure according to claim 1, wherein the inclination means includes an inclined surface whose inclination angle with respect to the upper surface of the first structure increases as the third structure is approached.   The seismic isolation structure according to claim 1, wherein a weight is installed on the fireproof covering material.   The seismic isolation structure according to any one of claims 1 to 3, wherein the fireproof covering material has a skeleton for resisting compressive deformation.

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