JP2003193488A - Base isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation structure which is simpler in structure and less expensive in cost than a conventional base isolation structure, and avoids damage of a lower structure such as a pile while achieving a base isolating effect on a superstructure even if a large earthquake occurs, for instance, to thereby stably hold a building. <P>SOLUTION: According to the base isolation structure, the building 1 is constructed such that the superstructure 2 and the foundation structure bearing the same are isolated from each other. At a lower peripheral portion of the superstructure 2, a peripheral underground continuous wall 3a1 is embedded in surface ground 7a, and at a lower internal portion of the superstructure 2, an inner ground continuous wall 3a2 is embedded in the ground so as to reach a bearing stratum 7b. Then, the superstructure 2 is connected to the peripheral underground continuous wall 3a1 by a steel pipe 4a which is yield- deformed when an impact force is generated at the building 1, and the superstructure 2 is borne on the inner underground continuous wall 3a2. Further, the base isolation structure includes a plain bearing 6 for accommodating relative deformation between the superstructure 2 and the inner underground continuous wall 3a2 when the building 1 suffers an impact force. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a seismic isolation structure applied to a building.

[0002]

2. Description of the Related Art Conventionally, as a mechanism for extending the natural period of a building and reducing the energy input to the building during an earthquake, for example, as shown in FIG.
The seismic isolation structure is used in which the upper structure 102 and the lower structure 103 of No. 01 are connected by a laminated rubber 107, a high damping laminated rubber 108, and, if necessary, a damper 109 made of low yield point steel or the like. However, the conventional general seismic isolation structure uses relatively expensive laminated rubber or the like,
Since the structure is relatively complicated, it takes time and effort for construction, and because it requires inspection and maintenance, it cannot be used as an effective space such as a living room and becomes a dead space. Must be formed, which is a factor to increase construction cost and maintenance cost. In addition, the frequency of large earthquakes to the extent that the effect of the seismic isolation structure is exerted depends on whether the building is used or not. The introduction of seismic isolation structure was desired.

Therefore, as a result of intensive studies, the present applicant has developed a seismic isolation structure disclosed in Japanese Patent Laid-Open No. 2001-131991. This seismic isolation structure is, for example, as shown in FIG. 6, an upper structure 202 and a lower structure 20 configured to be insulated from each other.
3 and 3 are connected to each other by a steel pipe 204a and a reinforcing bar 204b which are yield-deformed when the building 201 receives an impact force. In this seismic isolation structure, a seismic isolation device such as laminated rubber is not used, and the dead space as described above is not formed, so that the construction cost and the maintenance cost are significantly reduced.

[0004]

By the way, in the conventional general seismic isolation structure and the seismic isolation structure described in the above publication, the seismic isolation effect of the upper structure is mainly expected, and damage to the lower structure such as piles is expected. Avoidance was not intended. That is, although the building is constructed such that its upper structure and lower structure are insulated from each other, they are connected by a seismic isolation device, steel material, etc. Therefore, for example, when a large earthquake occurs,
It has been feared that the large deformation that occurs in the upper structure will be followed by the lower structure such as the piles that support the building, resulting in damage to the lower structure.

On the other hand, as a technique for reducing damage to the lower structure, there is a structure shown in Japanese Patent Laid-Open No. 2000-144763, in which a pile head and a foundation slab are joined by pins. However, the technique described in the above publication is not a structure in which a seismic isolation effect can be expected in the superstructure. Therefore, for example, when a large earthquake occurs, the moment of the pile head is reduced,
The deformation of the pile head is more than double that in the case of fixed joining, and since there is no mechanism to reduce the energy input to the building, the superstructure is excessively deformed, and the gap between adjacent buildings and piping Problems also occur with the structure of the equipment.

In view of the above circumstances, an object of the present invention is to provide a structure which is simpler and less expensive than the conventional general seismic isolation structure, and has a seismic isolation effect on the upper structure even when a large earthquake or the like occurs. It is an object of the present invention to provide a seismic isolation structure capable of stably holding a structure while avoiding damage to a lower structure such as a pile while obtaining it.

[0007]

In order to solve the above problems, the seismic isolation structure according to claim 1 has an upper structure 2 and a lower structure of a building 1 as shown in, for example, FIGS. Peripheral underground continuous wall 3a1, internal underground continuous wall 3a2, outer peripheral pile 3
b1 and the inner pile 3b2) are constructed so as to be insulated from each other, and the upper structure 2 and the lower structure (the outer peripheral underground continuous wall 3a) are constructed.
1. The upper structure 2 and the lower structure (the outer peripheral underground continuous wall 3a1, the outer peripheral pile 3b1) are connected to the outer peripheral pile 3b1), and when the building 1 receives an impact force. Is a steel material that yields and deforms (steel pipe 4a, reinforcing bar 4b), and the upper structure 2 is a lower structure (internal underground continuous wall 3a2, internal pile 3b2).
A slide bearing 6 that supports the above structure and allows relative deformation between the upper structure 2 and the lower structure (internal underground continuous wall 3a2, internal pile 3b2) when the building 1 receives an impact force.
And are provided.

According to the first aspect of the invention, when a building receives an impact force due to an earthquake or the like, stress concentrates on the steel material connecting the upper structure and the lower structure, and this steel material is It yields and deforms. Although relative deformation occurs between the upper structure and the lower structure due to the yield deformation of the steel material, the sliding bearing supports the upper structure on the lower structure while allowing the relative deformation.

That is, part of the energy input to the building is absorbed by the steel material, the natural period of the building is extended, and resonance between the building and the ground is avoided, so that the energy input to the building is increased. And the seismic isolation effect of the building is obtained. At this time, even if relative deformation occurs between the upper structure and the lower structure, the lower structure below the slide bearing is not damaged, and the upper structure is supported by the lower structure without damage, The stability of the building is maintained.

Further, unlike the conventional case, it is not necessary to provide a seismic isolation device such as laminated rubber or to form a seismic isolation layer including a dead space that is difficult to effectively use, and the upper structure and the lower structure are not required. Since it has a relatively simple structure in which a sliding bearing that is less expensive than the steel material or laminated rubber is provided between the above and the steel materials, it is possible to reduce the construction cost and the construction period of the building.

The lower structure is a continuous underground wall or a pile in the case of a general foundation seismic isolation structure, but in the case of an intermediate floor seismic isolation structure, it serves as a building frame.

The impact force is seismic force or the like.

As the steel material, a low yield point steel having a high toughness may be used, but a commonly used ordinary steel material may be used. When using a steel pipe as the steel material,
It is desirable to use a circular cross section having no anisotropy in the horizontal direction, but it is also possible to use another cross section such as a prism or a cross. Further, a reinforcing bar or a steel rod may be used in combination with the steel pipe.

The sliding bearing is generally composed of a sliding plate fixed to the upper structure by anchor bolts and the like and a mating plate fixed to the lower structure by anchor bolts and the like, and the surface of the sliding plate is coated. By doing so, the coefficient of friction with the mating plate is made extremely small. With this sliding bearing, the upper structure can be relatively deformed by sliding on the lower structure. By using a sliding bearing together with a conventional seismic isolation structure that uses laminated rubber, etc., it is possible to reduce the number of laminated rubber and extend the period.
It is possible to make the base-isolated building even higher and adapt it to soft ground.

The invention described in claim 2 is, for example, as shown in FIGS.
As shown in, in the seismic isolation structure according to claim 1, the upper structure 2 and the lower structure (outer peripheral underground continuous wall 3a1, inner underground continuous wall 3a2, outer peripheral portion pile 3b1, internal pile 3b2), It is constructed by any one of a reinforced concrete structure, a steel-framed reinforced concrete structure, and a steel-framed concrete structure. It is characterized in that it is embedded and fixed in the head portion, the pile head portion of the outer peripheral portion pile 3b1).

According to the second aspect of the present invention, at least one of the upper portion and the lower portion of the steel material is embedded and fixed in the concrete frame. Here, the concrete skeleton is a concrete skeleton in any one of a reinforced concrete structure, a steel frame reinforced concrete structure, and a steel frame concrete structure. Therefore, it is possible to easily fix the steel material to at least one of the upper structure and the lower structure, and to reliably yield the steel material when the building receives an impact force due to an earthquake or the like. It can be deformed and a reliable seismic isolation effect can be obtained.

The invention according to claim 3 is, for example, as shown in FIGS.
As shown in FIG. 3, in the seismic isolation structure according to claim 1 or 2, the upper structure 2 and the lower structure (the outer peripheral underground continuous wall 3a).
1, internal underground continuous wall 3a2, outer peripheral pile 3b1, internal pile 3
b2) is constructed by any one of a reinforced concrete structure, a steel-framed reinforced concrete structure, and a steel-framed concrete structure, and one of the upper and lower parts of the steel material (steel pipe 4a, reinforcing bar 4b) is a concrete skeleton (outer part underground) It is embedded and fixed in the wall head of the continuous wall 3a1 and the pile head of the outer peripheral portion pile 3b1. The other is embedded in the concrete frame (footing of the lower end of the upper structure 2) with the cushioning material 5 sandwiched therebetween. It is characterized by

According to the third aspect of the present invention, one of the upper part and the lower part of the steel material is embedded and fixed in the concrete skeleton, and the other is embedded in the concrete skeleton with a cushioning material sandwiched therebetween. ing. Therefore, the steel material can be easily fixed to the upper structure and the lower structure, or
In addition to engaging, the steel material can be reliably yield-deformed when the building receives an impact force due to an earthquake or the like, and a reliable seismic isolation effect can be obtained. Also, at this time, in the part of the concrete skeleton in which the steel material is embedded with the cushioning material sandwiched between them, even if an impact force is generated on the building due to an earthquake or the like, the stress is not concentrated locally but dispersed. , Breaking and cracking of concrete frame are prevented. Therefore, it is possible to reduce repair cost and labor after an earthquake or the like.

The invention according to claim 4 is, for example, as shown in FIGS.
The seismic isolation structure according to any one of claims 1 to 3, wherein the lower structure is an underground continuous wall (outer peripheral underground continuous wall 3a1, internal underground continuous wall 3a2). I am trying.

According to the invention described in claim 4, this seismic isolation structure can be applied to a building having an underground continuous wall foundation.

The invention according to claim 5 is, for example, as shown in FIG. 4, in the seismic isolation structure according to any one of claims 1 to 3, wherein the lower structure is a pile (peripheral part pile 3b1, inner pile 3b).
It is characterized by being 2).

According to the invention of claim 5, the seismic isolation structure can be applied to a building having a pile foundation.

The invention according to claim 6 is, for example, as shown in FIG. 1, in the seismic isolation structure according to claim 4 or 5, wherein the lower structure (internal underground continuous wall 3a2) is below the sliding bearing 6. 2 is characterized by being extended to the support layer 7b.

According to the invention of claim 6, the lower structure extends to the support layer below the sliding bearing. As a result, even when the building receives an impact force due to an earthquake or the like, the upper structure is surely supported by the lower structure below the sliding bearing supported by the support layer, and the stability of the building is further ensured. Can be kept.

The invention described in claim 7 is, for example, as shown in FIGS.
As shown in, in the seismic isolation structure according to any one of claims 4 to 6, while connecting the upper structure 2 and the lower structure (outer peripheral part underground continuous wall 3a1, outer peripheral part pile 3b1),
The steel material (steel pipe 4a, rebar 4b) that yields and deforms when the building 1 receives an impact force is provided on the outer peripheral portion of the building 1 between the upper structure 2 and the lower structure. It has a feature.

According to the invention described in claim 7, since the steel material is provided on the outer peripheral portion of the building between the upper structure and the lower structure, a large impact force is applied to the building due to an earthquake or the like. When the steel material is yield-deformed due to the occurrence of a crack, the steel material can be removed, a new steel material is provided, and the upper structure and the lower structure can be easily repaired while accessing from the ground.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION First, an outline of a seismic isolation structure of the present invention will be described. In FIG. 1, reference numeral 1 indicates a reinforced concrete building to which the seismic isolation structure according to the present invention is applied.
As shown in FIGS. 1 and 2, the building 1 is composed of a superstructure 2 and a foundation structure supporting the superstructure 2,
Furthermore, this foundation structure is constructed such that the outer continuous underground wall 3a1 buried in the ground 7 below the outer peripheral portion of the building 1 and the inner continuous underground wall buried in the ground 7 below the inner portion of the building 1. 3a2. Superstructure 2
The outer circumferential continuous wall 3a1 and the inner underground continuous wall 3a2 are insulated from each other so that a clearance C1 is formed.

Between the upper structure 2 and the outer peripheral underground continuous wall 3a1, the upper structure 2 and the outer peripheral underground continuous wall 3a1 are connected, and the structure 1 yields when it receives an impact force. A deformable steel pipe 4a is provided. Further, between the upper structure 2 and the inner underground continuous wall 3a2, the upper structure 2 is supported on the inner underground continuous wall 3a2, and when the building 1 receives an impact force, the upper structure 2 And internal continuous wall 3a2
A sliding bearing 6 is provided to allow relative deformation between the and.

The steel pipe 4a, which is yield-deformed when the building 1 is subjected to impact force, is provided above the outer peripheral underground continuous wall 3a1. Further, the outer peripheral underground continuous wall 3a1 is formed on the surface ground 7a. Embedded relatively shallowly. The steel pipe 4a
The upper part of the upper structure 2 is embedded in the footing of the lower end of the upper structure with a rubber cushioning material 5 sandwiched therebetween, and the lower part is embedded in the wall head of the outer continuous underground wall 3a1 by a predetermined length. Has been established.

The steel pipe 4a is made of tough, low-yield-point steel having a circular cross section, and its wall thickness is such that the steel pipe 4a does not buckle during normal times and the building 1 has an impact force. It is set to such a degree that it yields and undergoes plastic deformation when subjected to a stress. Further, the clearance C1 between the upper structure 2 and the outer peripheral underground continuous wall 3a1 is set to be sufficiently smaller than the sectional configuration of the steel pipe 4a. In the clearance C1, the steel pipe 4a is not covered with concrete, and the horizontal force is transmitted between the superstructure 2 and the ground 7 through the steel pipe 4a provided on the outer peripheral underground continuous wall 3a1. It is supposed to be done.

A sliding bearing 6 which allows relative deformation between the upper structure 2 and the internal underground continuous wall 3a2 when the building 1 receives an impact force is provided on the upper portion of the internal underground continuous wall 3a2. Further, the underground continuous wall 3a2 is embedded so as to reach the support layer 7b. That is, the length of the inner underground continuous wall 3a2 is set to be longer than the length of the outer peripheral underground continuous wall 3a1.

The sliding bearing 6 comprises a sliding plate 6a having a surface coated and a mating plate 6b.
The mating plate 6b and the mating plate 6b are very slippery, for example, a coefficient of dynamic friction μ = 0.08. The sliding plate 6a and the mating plate 6b are made of stainless steel, and the sliding plate 6a has a PTF.
E (tetrafluoroethylene resin) treatment is applied. The sliding plate 6a is fixed to the footing formed at the lower end of the upper structure 2 by anchor bolts,
The mating plate 6b is fixed to the wall head of the internal underground continuous wall 3a2 by anchor bolts. The vertical load of the upper structure 2 is mainly transmitted to the supporting layer 7b from the inner underground continuous wall 3a2 through the sliding bearing 6.

The operation of the seismic isolation structure in this embodiment will be described below.

When an impact force such as seismic force is applied to the building 1 provided with the seismic isolation structure, as shown in FIGS. 1 (b) and 2, the space between the superstructure 2 and the ground 7 at the clearance C1. The horizontal force is transmitted through the steel pipe 4a as described above. Therefore, when the impact force is larger than the total yield strength of the steel pipe 4a, the steel pipe 4a yields and causes plastic deformation. By causing the steel pipe 4a to undergo plastic deformation, the energy input to the building 1 is reduced, and further, the natural period of the building 1 is extended and the building 1
By avoiding the resonance between the ground and the ground 7, a seismic isolation effect can be obtained.

At this time, the upper structure 2 and the internal underground continuous wall 3a
Even if a relative deformation occurs between the sliding bearing 6 and the sliding bearing 6, the sliding bearing 6 allows the relative deformation by sliding the sliding plate 6a and the mating plate 6b, so that the internal underground continuous wall 3a2 below the sliding bearing 6 is allowed. No damage to the head of the wall. Therefore, a large horizontal force acts on the building due to a large earthquake or the like, and as a result, even if a large relative deformation occurs between the superstructure 2 and the internal underground continuous wall 3a2, no damage occurs in the internal underground continuous. Since the upper structure 2 is stably supported by the wall 3a2, the stability of the building 1 is maintained.

In the event of a large earthquake, a large shearing force acts on the steel pipe 4a, and the footing at the lower end of the upper structure 2 connected by the steel pipe 4a and the wall head of the outer circumferential continuous wall 3a1 are connected. A large pressing force is generated by the steel pipe 4a. At this time, in the footing of the lower end portion of the upper structure 2 in which the steel pipe 4a is embedded with the cushioning material interposed therebetween,
The buffer material 5 disperses the stress without locally concentrating it, so that breakage or cracking of concrete is prevented.

Further, at the wall head of the outer continuous underground wall 3a1 where the steel pipe 4a is embedded and fixed, the concrete may be partially broken or cracked due to the large pressing force generated in the steel pipe 4a. is there. However, the vertical load exerted from the superstructure 2 on the outer peripheral continuous wall 3a1 buried in the ground 7 so as to be located on the outer peripheral portion of the building 1 is relatively small, and the outer continuous underground wall 3a1 Even if the wall head part is partially broken or cracked, the stability of the building 1 is not affected.

By the way, when a large yield deformation occurs in the steel pipe 4a due to a large earthquake or the like, it is necessary to perform repair work. In this case, the position of the building 1 is returned to the original position using a jack or the like, and the steel pipe 4a and the steel pipe 4 are
Perimeter continuous underground wall 3a in which a is embedded and fixed
It is sufficient to remove a part of the wall head 1 and provide a new steel pipe 4a, and fill the wall head with mortar or the like. By the way, since the steel pipe 4a is provided on the outer peripheral portion of the building 1, the repair work can be easily accessed from the ground.

As described above, according to the seismic isolation structure of the present embodiment,
The following effects can be obtained.

When a structure receives an impact force due to an earthquake or the like, stress concentrates on the steel pipe 4a and the reinforcing bar 4b connecting the upper structure 2 and the outer continuous underground wall 3a1. And the rebar 4b is yield-deformed. Due to the yield deformation of the steel pipe 4a and the reinforcing bar 4b, relative deformation occurs between the upper structure 2 and the outer peripheral underground continuous wall 3a1 and the inner underground continuous wall 3a2, but the sliding bearing 6 allows the relative deformation. The upper structure 2 is supported on the inner underground continuous wall 3a2.

That is, a part of the energy input to the building 1 is absorbed by the steel pipe 4a, the natural period of the building 1 is extended, and the resonance between the building 1 and the ground 7 is avoided so that the building 1 is constructed. The energy input to the object 1 is reduced, and the seismic isolation effect of the building 1 is obtained. At this time, even if relative deformation occurs between the upper structure 2 and the outer peripheral underground continuous wall 3a1 or the internal underground continuous wall 3a2, the wall head portion of the internal underground continuous wall 3a2 is not damaged. Since the upper structure 2 is stably supported by the inner underground continuous wall 3a2 which is not damaged, the stability of the building 1 is maintained.

Further, unlike the conventional case, it is not necessary to provide a seismic isolation device such as laminated rubber or to form a seismic isolation layer including a dead space that is difficult to effectively use, and the upper structure 2 and the outer periphery are not required. Part underground continuous wall 3a1 and internal underground continuous wall 3
Since the steel pipe 4a and the sliding bearing 6 which is less expensive than laminated rubber or the like are provided between the a2 and a2, the structure is relatively simple.
It is possible to reduce the construction cost and the construction period of the building 1.

The upper portion of the steel pipe 4a is embedded in the footing at the lower end of the upper structure 2 with the cushioning material 5 sandwiched therebetween, and the lower portion is embedded in the wall head portion of the outer circumferential underground continuous wall 3a1 and fixed therein. Has been done. Therefore, the steel pipe 4a is
While being easily fixed to the peripheral underground continuous wall 3a1,
It can be easily engaged with the upper structure 2, so that when the building 1 receives an impact force due to an earthquake or the like,
The steel pipe 4a can be reliably yield-deformed, and a reliable seismic isolation effect can be obtained. Further, at this time, the steel pipe 4a is replaced by the cushioning material 5.
In the footing of the lower end of the superstructure 2 which is embedded by sandwiching it, even when an impact force is generated on the building 1 due to an earthquake or the like, the stress is not locally concentrated and is dispersed, so that the wall head The destruction and cracking of the can be prevented. Therefore, it is possible to reduce repair cost and labor after an earthquake or the like.

Internal underground continuous wall 3a below the sliding bearing 6
2 extends to the support layer 7b. As a result, even when the building 1 receives an impact force due to an earthquake or the like, the upper structure 2 is reliably supported by the inner underground continuous wall 3a2 below the sliding bearing 6 which is supported by the support layer 7b. Thus, the stability of the building 1 can be maintained more reliably.

Since the steel pipe 4a is provided at the upper end of the outer continuous underground wall 3a1, when a large impact force is generated in the building 1 due to a large earthquake or the like, and the steel pipe 4a is largely yielded and deformed, This steel pipe 4a is removed and a new steel pipe 4a
In addition to the above, it is possible to easily perform repair work for filling the wall head of the outer peripheral underground continuous wall 3a1 with mortar and the like while accessing from the ground.

The seismic isolation structure of the present invention is not limited to this embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.

For example, in the present embodiment, the seismic isolation structure is applied to the building 1 having a reinforced concrete structure, but it goes without saying that it can also be applied to a steel-framed reinforced concrete structure, a steel-framed concrete structure, and other steel-framed structures. Is.

Further, in the present embodiment, the steel pipe 4a
The upper part of the cushioning material 5 on the footing of the lower end of the superstructure 2
And the lower part is embedded and fixed to the wall head of the outer peripheral underground continuous wall 3a1 which is the lower structure. However, for example, the upper portion of the steel pipe 4a is embedded and fixed in the footing of the lower end portion of the upper structure 2, and the lower portion is attached to the wall head portion of the outer peripheral underground continuous wall 3a1.
You may embed it by sandwiching. Further, the cushioning material 5 is not limited to rubber, and may be made of an elastic body other than rubber or a viscoelastic body.

Further, it is not always necessary to provide the cushioning material 5, and for example, both the upper part and the lower part of the steel pipe 4a are superstructure 2.
It may be fixed by embedding it in the footing of the lower end portion and the wall head portion of the outer peripheral underground continuous wall 3a1 which is the lower structure. Further, for example, as shown in FIG. 3, in order to connect the upper structure 2 and the outer peripheral underground continuous wall 3a1 which is the lower structure,
In addition to the steel pipe 4a, the reinforcing bar 4b may be embedded and fixed in the upper structure 2 and the outer peripheral underground continuous wall 3a1. In this case, the upper structure 2 and the outer peripheral underground wall 3a1 are more reliably connected.

Further, in the present embodiment, the lower structure is based on the outer peripheral underground continuous wall 3a1 and the inner underground continuous wall 3a2. However, for example, it may be a pile foundation as shown in FIG. Of course, it can be used as a direct basis. When using a pile foundation, superstructure 2
In the lower part of the outer peripheral portion of the
Is buried in the surface ground 7a, and a relatively long inner pile 3b2 is provided below the inside of the upper structure 2 with the support layer 7a.
It may be buried in the ground 7 so as to reach b.
At this time, the lower portion of the steel pipe 4a may be embedded and fixed in the pile head of the outer peripheral pile 3b1. When the seismic isolation structure according to the present invention is applied to the intermediate floor seismic isolation structure, the lower structure is the structure of the building below the seismic isolation layer.

[0051]

According to the seismic isolation structure of the first aspect, a part of the energy input to the building is absorbed by the steel material, and the natural period of the building is extended, so that the upper structure and the lower structure are separated from each other. By avoiding the resonance, the energy input to the building is reduced, and the seismic isolation effect of the building is obtained.
At this time, even if relative deformation occurs between the upper structure and the lower structure, the lower structure below the sliding bearing is not damaged,
Since the upper structure is supported by this lower structure, the stability of the building is maintained.

Further, unlike the conventional case, it is not necessary to provide a seismic isolation device such as laminated rubber or to form a seismic isolation layer including a dead space that is difficult to effectively use, and the upper structure and the lower structure are not required. Since a relatively simple structure is provided between the steel material and the rubber bearing, which is less expensive than the laminated rubber or the like, the construction cost and the construction period of the building can be reduced.

According to the seismic isolation structure of the second aspect, the same effect as that of the first aspect of the invention can be obtained, and the steel material is easily fixed to the upper structure and the lower structure. As a result, when a building receives an impact force due to an earthquake or the like, the steel material can be reliably yield-deformed, and a reliable seismic isolation effect can be obtained.

According to the seismic isolation structure of the third aspect, the same effect as that of the first or second aspect of the invention can be obtained, and the steel material is fixed or attached to the upper structure and the lower structure. This makes it possible to easily combine the materials, and thereby, when the building receives an impact force due to an earthquake or the like, the steel materials can be reliably yield-deformed, and a reliable seismic isolation effect can be obtained. Also, at this time, in the part of the concrete skeleton in which the steel material is embedded with the cushioning material sandwiched between them, even if an impact force is generated on the building due to an earthquake or the like, the stress is not concentrated locally but dispersed. , Concrete destruction and cracking are prevented.
Therefore, it is possible to reduce the cost and labor for repairing after an earthquake or the like.

According to the seismic isolation structure of the fourth aspect, the same effect as that of the invention of any one of the first to third aspects can be obtained. It can be applied to wall-based structures.

According to the seismic isolation structure of the fifth aspect, the same effect as that of the invention of any one of the first to third aspects can be obtained. It can be applied to buildings.

According to the seismic isolation structure described in claim 6, it is of course possible to obtain the same effect as that of the invention described in claim 4 or 5, and when the structure receives an impact force due to an earthquake or the like. Also, the upper structure can be reliably supported by the lower structure below the sliding bearing, which is supported by the support layer, so that the stability of the building can be more reliably maintained.

According to the seismic isolation structure of claim 7, not only the same effects as those of the invention of any one of claims 4 to 6 can be obtained, but also a large impact force is exerted on a building due to an earthquake or the like. When a large yield deformation occurs in the steel material due to the occurrence of, the steel material is removed and a new steel material is provided.
The work of repairing the upper and lower structures can be easily performed while accessing from the ground.

[Brief description of drawings]

FIG. 1A is a schematic view showing an example of a seismic isolation structure according to the present invention, and FIG. 1B is a schematic view showing an operation of the seismic isolation structure.

FIG. 2 is a cross-sectional view showing an example of the seismic isolation structure according to the present invention and its operation.

FIG. 3 is a cross-sectional view showing another example of the seismic isolation structure of the present invention and its action.

FIG. 4 is a cross-sectional view showing another example of the seismic isolation structure of the present invention and its action.

FIG. 5 is a schematic view showing an example of a conventional seismic isolation structure.

FIG. 6 is a schematic view showing an example of a conventional seismic isolation structure.

[Explanation of symbols] 1 building 2 superstructure 3a1 Perimeter continuous underground wall (substructure) 3a2 Internal underground wall (substructure) 3b1 Peripheral part pile (substructure) 3b2 internal pile (substructure) 4a Steel pipe (steel material) 4b Reinforcing bar (steel material) 5 cushioning material 6 sliding bearing 7 ground 7a Surface ground 7b Support layer C1 clearance 101 building 102 Superstructure 103 Substructure 107 laminated rubber 108 High damping laminated rubber 109 damper C100 (of seismic isolation layer) height 201 Building 202 Superstructure 203 Substructure 204a steel pipe 204b rebar

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Claims (7)

[Claims] 1. An upper structure and a lower structure of a building are insulated from each other, and the upper structure and the lower structure are connected to each other between the upper structure and the lower structure, and the structure is impacted. A steel material that yields when subjected to a force and supports the upper structure on the lower structure, and allows relative deformation between the upper structure and the lower structure when a building receives an impact force. A seismic isolation structure characterized in that it is provided with a sliding bearing. 2. The seismic isolation structure according to claim 1, wherein the upper structure and the lower structure are reinforced concrete structures,
A seismic isolation structure constructed by either a steel-framed reinforced concrete structure or a steel-framed concrete structure, wherein at least one of an upper part and a lower part of the steel material is embedded and fixed in a concrete frame. 3. The seismic isolation structure according to claim 1, wherein the upper structure and the lower structure are reinforced concrete structures,
Constructed by either a steel reinforced concrete structure or a steel concrete structure, one of the upper and lower parts of the steel material is embedded and fixed in the concrete frame, and the other is a concrete frame with a cushioning material sandwiched between them. Seismic isolation structure characterized by being embedded in. 4. The seismic isolation structure according to claim 1, wherein the lower structure is an underground continuous wall. 5. The seismic isolation structure according to claim 1, wherein the lower structure is a pile. 6. The seismic isolation structure according to claim 4 or 5, wherein the lower structure extends to a support layer below the sliding bearing. 7. The seismic isolation structure according to claim 4, wherein the upper structure and the lower structure are connected to each other, and the steel material yield-deformed when a building receives an impact force is the above-mentioned steel material. A seismic isolation structure characterized by being provided on the outer peripheral portion of a building, between the upper structure and the lower structure.