JP6319790B2 - Sliding support structure - Google Patents

Description

  The present invention relates to a sliding bearing structure that supports, for example, an upper structure from a lower structure by an elastic sliding bearing.

Conventionally, a seismic isolation structure that supports a building body from a foundation by an elastic sliding support is known.
The base isolation structure includes, for example, a foundation, a base isolation device provided on the base, and a building body provided on the base isolation device.
The seismic isolation device includes a lower flange, an elastically deformable laminated rubber provided on the lower flange, and an upper flange provided on the laminated rubber.
A sliding plate is provided on the foundation, and the lower flange of the seismic isolation device is slidable on the sliding plate (see Patent Documents 1 and 2).

  According to such a seismic isolation structure, when the horizontal load applied to the building at the time of the earthquake is small, the laminated rubber which is an elastic body is deformed to reduce the shaking of the building body due to the horizontal load. On the other hand, when the horizontal load applied to the building is large, in addition to the deformation of the laminated rubber, the lower flange of the seismic isolation device slides on the sliding plate to reduce the shaking of the building due to the horizontal load.

JP 2011-196252 A JP 2011-122404 A

If a fire breaks out on the floor, the support capacity of the seismic isolation device may be reduced by the heat of the fire. Therefore, it is necessary to surround the seismic isolation device with a fireproof covering material to protect the seismic isolation device from fire.
By the way, when a fire broke out immediately after the earthquake and the seismic isolation device slid on the sliding plate due to the earthquake motion, the refractory material may fall off due to the movement of the seismic isolation device, and the seismic isolation device may be exposed. In addition, since the seismic isolation device is moving on the sliding plate, the refractory material may fall off and a part of the seismic isolation device and the sliding plate may be exposed. Therefore, in practice, it was difficult to protect the seismic isolation device from fire.

  It is an object of the present invention to provide a sliding bearing structure that can prevent the supporting force of a sliding bearing from being lowered even when a fire occurs after an earthquake.

The sliding bearing structure (for example, a seismic isolation structure 10 described later) of the present invention includes a lower structure (for example, a foundation 20 described later) and a sliding bearing (for example, a seismic isolation system described later) provided on the lower structure. Device 30) and an upper structure (for example, a building body 40 to be described later) provided on the sliding support, and extends upward from the lower structure and is laterally separated from the sliding support. A fire-resistant lower extension part (for example, a lower extension part 50 to be described later) that reaches the position, and a fire resistance that extends downward from the upper structure to the upper end surface of the lower extension part. It is preferable to include an upper extending portion (for example, an upper extending portion 60 described later) having performance.

The sliding bearing structure according to claim 1 (for example, seismic isolation structure 10A described later) includes a lower structure, a sliding bearing provided on the lower structure, and an upper part provided on the sliding bearing. A lower extension part having a fire resistance, extending downward from the lower structure and reaching a position laterally away from the sliding support, and extending downward from the upper structure. An upper extension portion having a fire resistance performance reaching the upper end surface of the lower extension portion, and an upper end surface and an upper end side surface of the lower extension portion, and a lower portion of the upper extension portion. A refractory material whose volume is increased by heat (for example, expanded refractory materials 53, 54, 63, and 64 described later) is provided on the side surfaces on the end surface and the lower end side.

The sliding bearing structure of the present invention (for example, seismic isolation structure 10B described later) includes a lower structure, a sliding bearing provided on the lower structure, and an upper structure provided on the sliding bearing. In the lower structure and the floor finish, a recess (for example, a recess 22 described later) is formed, and the sliding support is provided in the recess, and extends substantially horizontally from the upper structure. It is preferable to include an upper extending portion having fire resistance performance that reaches the outside of the concave portion on the upper surface of the lower structure.

The sliding support structure (for example, seismic isolation structure 10C described later) of the present invention includes a lower structure, a sliding support provided on the lower structure, and an upper structure provided on the sliding support. , wherein the ranging from the upper structure at a position spaced laterally from sliding bearings of the upper surface of the lower structure extending downward, and the upper extending portion having a fire resistance, it is preferably provided with a.

The sliding bearing structure of the present invention (for example, seismic isolation structure 10D described later) includes a lower structure, a sliding bearing provided on the lower structure, and an upper structure provided on the sliding bearing. And extending downward from the lower structure and reaching a position laterally away from the sliding bearing, and having a fireproof performance and extending substantially horizontally from the upper structure. It is preferable to include an upper extending portion having fire resistance performance, in which an end surface reaches the upper end surface of the lower extending portion.

  According to the present invention, the lower extension portion having fire resistance is integrated with the lower structure, and the upper extension portion having fire resistance is integrated with the upper structure. Therefore, when the sliding bearing is deformed due to earthquake motion, or when the sliding bearing slides on the lower structure and residual deformation occurs, the upper end surface of the lower extension portion and the lower end surface of the upper extension portion Are displaced in the horizontal direction, or the upper surface of the lower structure and the lower end surface of the upper extension portion are displaced in the horizontal direction to follow this deformation. Therefore, the lower extension and the upper extension that have fire resistance do not break, so even if a slide bearing deformation or residual deformation occurs due to seismic motion, even if a fire occurs after the earthquake, the bearing capacity of the slide bearing It can be prevented from lowering.

It is sectional drawing of the sliding support structure which concerns on the 1st reference example of this invention. It is a figure for demonstrating operation | movement of the sliding support structure which concerns on the said reference example . It is sectional drawing of the sliding support structure which concerns on one Embodiment of this invention. It is a figure for demonstrating operation | movement of the sliding support structure which concerns on the said embodiment. It is sectional drawing of the sliding support structure which concerns on the 2nd reference example of this invention. It is a figure for demonstrating operation | movement of the sliding support structure which concerns on the said reference example . It is sectional drawing of the sliding support structure which concerns on the 3rd reference example of this invention. It is a figure for demonstrating operation | movement of the sliding support structure which concerns on the said reference example . It is sectional drawing of the sliding support structure which concerns on the 4th reference example of this invention. It is a figure for demonstrating operation | movement of the sliding support structure which concerns on the said reference example .

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Reference Example ]
FIG. 1 is a cross-sectional view of a seismic isolation structure 10 as a sliding support structure according to a first reference example of the present invention.
The seismic isolation structure 10 includes a base 20 as a lower structure, a seismic isolation device 30 as an elastically deformable sliding support slidably provided on the base 20, and a seismic isolation device 30. And a building main body 40 as an upper structure provided. This seismic isolation structure 10 supports the building main body 40 in a state in which it can move relative to the foundation 20 in the horizontal direction by means of an elastic sliding support.

The seismic isolation device 30 includes a lower flange 31, a laminated rubber 32 provided on the lower flange 31, and an upper flange 33 provided on the laminated rubber 32.
The floor surface 20A of the foundation 20 is a smooth surface, and a sliding plate 21 on which the lower flange 31 of the seismic isolation device 30 can slide is provided on the floor surface 20A.

  The foundation 20 is provided with a lower extending portion 50 that extends upward from the foundation 20 and reaches a position away from the seismic isolation device 30 laterally. The lower extension 50 is formed of a material having fire resistance, such as a calcium silicate plate.

  Specifically, the lower extension portion 50 includes a vertical portion 51 that extends substantially vertically upward from the floor surface 20A of the foundation 20, a horizontal portion 52 that is provided at the upper end of the vertical portion 51 and extends substantially horizontally, Is provided.

  A columnar upper base isolation base 41 is provided at a position immediately below the base isolation device 30 on the lower surface of the building body 40, and a base plate 42 is driven into the lower end surface of the upper base isolation base 41. The base plate 42 is fixed to the upper flange 33 of the seismic isolation device 30.

  The upper seismic isolation foundation 41 of the building body 40 is provided with an upper extension 60 extending downward from the upper seismic isolation foundation 41 and reaching the upper end surface of the lower extension 50. The upper extension 60 is formed of a material having fire resistance, such as a calcium silicate plate.

Specifically, the upper extension part 60 includes a horizontal part 61 that extends substantially horizontally from the side surface of the upper seismic isolation base 41, and a vertical part 62 that extends substantially vertically downward from the tip of the horizontal part 61.
On the lower end surface of the vertical portion 62, an expanded refractory material 63 that is foamed by heat and increases in volume is provided. A gap d is formed in the height direction between the lower end surface of the expanded refractory material 63 and the upper end surface of the horizontal portion 52 of the lower extension 50.

  The upper end surface of the lower extension portion 50 and the lower end surface of the upper extension portion 60 overlap each other by a predetermined dimension or more in plan view. Here, the predetermined dimension is the maximum value of the residual deformation that occurs due to the assumed earthquake motion.

The operation of the above seismic isolation structure 10 is as follows.
That is, when a horizontal load is applied to the building due to seismic motion, the laminated rubber 32 of the seismic isolation device 30 is deformed, or the seismic isolation device 30 moves horizontally on the sliding plate 21 to cause the building to shake due to this horizontal load. Reduce.
As a result, when residual deformation occurs, as shown in FIG. 2, the upper end surface of the lower extension portion 50 and the lower end surface of the upper extension portion 60 are shifted in the horizontal direction. Thereafter, when a fire occurs, the expanded refractory material 63 foams due to the heat of the fire and closes the gap d.

According to this reference example , there are the following effects.
(1) The lower extension 50 having fire resistance is integrated with the foundation 20, and the upper extension 60 having fire resistance is integrated with the building body 40. Therefore, when the seismic isolation device 30 is deformed by seismic motion or when the base isolation device 30 slides on the foundation 20 and residual deformation occurs, the upper end surface and the upper extension of the lower extension portion 50 are extended. The lower end surface of the portion 60 is displaced in the horizontal direction and follows this deformation. Therefore, even if a fire occurs after an earthquake, it is possible to prevent the supporting force of the seismic isolation device 30 from decreasing.

  (2) Since the expanded refractory material 63 that is foamed by heat and increases in volume is provided on the lower end surface of the upper extending portion 60, even if a fire occurs after residual deformation occurs, the expanded refractory material is heated by the heat of the fire. Since the material 63 foams and closes the gap d between the lower extension portion 50 and the upper extension portion 60, it is ensured that the supporting force of the seismic isolation device 30 is reduced when a fire occurs after the earthquake. Can be prevented.

[Implementation Embodiment
FIG. 3 is a cross-sectional view of the seismic isolation structure 10A according to one embodiment of the present invention.
In the present embodiment, the structure of the lower extension 50 is different from that of the first reference example .
In other words, the lower extension 50 extends upward substantially vertically from the floor surface 20 </ b> A of the foundation 20. An expansion refractory material 53 that is foamed by heat and increases in volume is provided on the upper end surface of the lower extension portion 50. The upper end surface of the expansion refractory material 53 and the expansion fire resistance material of the upper extension portion 60 are provided. A slight gap d is formed between the lower end surface of the material 63.

In addition, an expanded refractory material 54 that is foamed by heat and increases in volume is provided on the side surface on the upper end side of the lower extension 50.
In addition, an expanded refractory material 64 that is foamed by heat and increases in volume is provided on the side surface on the lower end side of the vertical portion 62 of the upper extending portion 60.

The operation of the above seismic isolation structure 10A is as follows.
That is, when a horizontal load is applied to the building due to the earthquake motion, the laminated rubber 32 of the seismic isolation device 30 is deformed, or the seismic isolation device 30 moves horizontally on the sliding plate 21 to reduce the shaking due to the horizontal load. .
As a result, when residual deformation occurs, as shown in FIG. 4, the upper end surface of the lower extension portion 50 and the lower end surface of the upper extension portion 60 are shifted in the horizontal direction. Thereafter, when a fire occurs, the expanded refractory materials 53, 54, 63, 64 are foamed by the heat of the fire, and the expanded refractory materials 53, 54, 63, 64 cause a height gap d and a horizontal gap. Is blocked.

  According to the present embodiment, there are the same effects as the above (1) and (2).

[ Second Reference Example ]
FIG. 5 is a cross-sectional view of the seismic isolation structure 10B according to the second reference example of the present invention.
In this reference example, that the lower extending portion 50 of the first reference example is not provided, and, the structure of the foundation 20 and the upper extending portion 60, different from the first reference example.
That is, the foundation 20 is provided with a floor finish 23, thereby forming a recess 22. The bottom surface 22 </ b> A of the recess 22 is lower than the floor surface 20 </ b> A outside the recess 22.
The slip plate 21 is provided on the bottom surface 22 </ b> A of the recess 22. Thereby, the seismic isolation device 30 is provided in the recess 22.

Further, the upper extending portion 60 extends substantially horizontally from the side surface of the upper seismic isolation foundation 41 and reaches the floor surface 20 </ b> A outside the recess 22 of the foundation 20.
An expanded refractory material 65 that is foamed by heat and increases in volume is provided on the lower surface of the tip of the upper extension 60. A slight gap d is formed between the lower end surface of the expanded refractory material 65 and the floor surface 20A outside the recess 22 of the foundation 20.
The floor surface 20A outside the concave portion 22 of the foundation 20 and the lower surface of the upper extending portion 60 overlap each other by a predetermined dimension or more in plan view.

The operation of the above seismic isolation structure 10B is as follows.
That is, when a horizontal load is applied to the building due to the earthquake motion, the laminated rubber 32 of the seismic isolation device 30 is deformed, or the seismic isolation device 30 moves horizontally on the sliding plate 21 to reduce the shaking due to the horizontal load. .
As a result, when residual deformation occurs, as shown in FIG. 6, the floor surface 20 </ b> A of the foundation 20 and the lower end surface of the expanded refractory material 65 of the upper extension portion 60 are shifted in the horizontal direction. Thereafter, when a fire occurs, the expanded refractory material 65 is foamed by the heat of the fire and closes the gap d.

According to this reference example , the same effects as the above (1) and (2) are obtained.

[ Third reference example ]
FIG. 7 is a cross-sectional view of the seismic isolation structure 10C according to the third reference example of the present invention.
In this reference example, that the lower extending portion 50 of the first reference example is not provided, and, the structure of the upper extending portion 60, different from the first reference example.
That is, the upper extension part 60 extends downward from the upper base isolation base 41 and reaches a position away from the outer peripheral surface of the base isolation device 30 on the floor surface 20 </ b> A of the base 20. A slight gap d is formed between the lower end surface of the expanded refractory material 63 of the upper extension 60 and the floor surface 20A of the foundation 20.

The operation of the above seismic isolation structure 10C is as follows.
That is, when a horizontal load is applied to the building due to the earthquake motion, the laminated rubber 32 of the seismic isolation device 30 is deformed, or the seismic isolation device 30 moves horizontally on the sliding plate 21 to reduce the shaking due to the horizontal load. .
As a result, when residual deformation occurs, as shown in FIG. 8, the floor surface 20 </ b> A of the foundation 20 and the lower end surface of the upper extension portion 60 are displaced in the horizontal direction. Thereafter, when a fire occurs, the expanded refractory material 63 foams due to the heat of the fire and closes the gap d.

According to this reference example , the same effects as the above (1) and (2) are obtained.

[ Fourth Reference Example ]
FIG. 9 is a cross-sectional view of the seismic isolation structure 10D according to the fourth reference example of the present invention.
In this reference example , the structure of the upper extension 60 is different from that of the first reference example .
That is, the upper extension part 60 extends substantially horizontally from the side surface of the upper base isolation base 41.
The lower extension 50 extends upward from the floor surface 20 </ b> A of the foundation 20 substantially vertically. An expansion refractory material 53 that is foamed by heat and increases in volume is provided on the upper end surface of the lower extension portion 50, and an upper end surface of the expansion refractory material 53 and a lower end surface of the upper extension portion 60. A slight gap d is formed between the two.
In addition, the upper end surface of the expanded refractory material 53 of the lower extension portion 50 and the lower end surface of the upper extension portion 60 overlap each other by a predetermined dimension or more in plan view.

The operation of the above seismic isolation structure 10D is as follows.
That is, when a horizontal load is applied to the building due to the earthquake motion, the laminated rubber 32 of the seismic isolation device 30 is deformed, or the seismic isolation device 30 moves horizontally on the sliding plate 21 to reduce the shaking due to the horizontal load. .
As a result, when residual deformation occurs, the upper end surface of the expanded refractory material 53 of the lower extension portion 50 and the lower end surface of the upper extension portion 60 are shifted in the horizontal direction, as shown in FIG. Thereafter, when a fire occurs, the expanded refractory material 53 is foamed by the heat of the fire and closes the gap d.

According to this reference example , the same effects as the above (1) and (2) are obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the implementation embodiments and reference examples described above, the sliding plate 21 on the basis 20 is provided, but the lower flange 31 of the seismic isolation device 30 and can slide on this slide plate 21 is not limited to this, A slide plate may be provided on the upper base isolation base 41 of the building body 40 so that the upper flange 33 of the base isolation device 30 can slide on the slide plate.

In the second reference example , the slip plate 21 is disposed on the bottom surface 22A of the recess 22. However, the present invention is not limited to this, and a protrusion may be provided on the foundation 20 and the slip plate may be disposed on the protrusion. In this case, the upper extending portion 60 extends substantially horizontally from the side surface of the upper seismic isolation foundation 41 and reaches the floor surface around the convex portion of the foundation 20.

d ... Gap 10, 10A, 10B, 10C, 10D ... Seismic isolation structure (sliding support structure)
20 ... Foundation (substructure)
20A ... Floor surface 21 ... Slip plate 22 ... Recess 22A ... Bottom surface 23 ... Floor finish 30 ... Seismic isolation device (slide support)
31 ... Lower flange 32 ... Laminated rubber 33 ... Upper flange 40 ... Building body (upper structure)
DESCRIPTION OF SYMBOLS 41 ... Upper base isolation base 42 ... Base plate 50 ... Lower side extension part 51 ... Vertical part 52 ... Horizontal part 53, 54 ... Expansion refractory material 60 ... Upper extension part 61 ... Horizontal part 62 ... Vertical part 63, 64, 65 ... Expanded refractory material

Claims (1)

A lower structure, a sliding support provided on the lower structure, and an upper structure provided on the sliding support;
A lower extension portion having fire resistance, extending upward from the lower structure to reach a position laterally away from the sliding bearing;
An upper extension having fire resistance, extending downward from the upper structure and reaching the upper end surface of the lower extension,
Upper surface and the upper end of the inner and outer sides of the lower extending portion, and the inner and outer sides of the lower end surface and the bottom side of the upper extending portion is provided with, characterized in that refractory material volume by heat is increased is provided Sliding bearing structure.

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