JP3381066B2 - Existing building seismic isolation method and seismic isolation building - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation construction method for seismically isolating an existing building, and a seismic isolated building.

[0002]

2. Description of the Related Art As is well known, by interposing a seismic isolation device such as laminated rubber between a lower structure and an upper structure, the natural period of the entire building is lengthened and an earthquake to the upper structure is generated. In recent years, many seismic isolated buildings have been realized to prevent energy input.

Recently, a seismic isolation device is newly installed between an upper structure and a lower structure of an existing building having a problem of seismic safety, so that the existing building is seismically isolated. The so-called seismic isolation retrofit, which aims to improve its seismic safety, has also been implemented.

For example, in the case of seismic isolation of an existing building, a new foundation is newly constructed below the existing foundation, and a seismic isolation device such as laminated rubber is interposed between the existing foundation and the new foundation. Therefore, a method of supporting the entire building through a base isolation layer under the foundation is generally considered.

FIG. 3 shows an example of a construction method for seismically isolating an existing building 1 having a basement floor. FIG. 3A shows a state before the seismic isolation, and FIG. 3B shows a state after the seismic isolation.

As shown in FIG. 3A, this existing building 1
Has a ground floor portion 2 and a basement floor portion 3, and the number of floors of the basement floor portion 3 is two areas SA and SB in the building plane.
Different between That is, in the first area SA, the basement floor is the second floor, but in the second area SB, the basement floor is 3 floors.
It is on the floor. Therefore, as a result, the foundation 10 of the building existing at the bottom of the basement has a step in the height direction. In the figure, 4 is a pillar and 5 is a beam or floor.

In this way, the area S having a plurality of basement floors
In the case of the difference between A and SB, in the conventional construction method, as shown in FIG.
As shown in (b), the base seismic isolation layer 16 (16A, 16B) is provided according to the shape of the base 10. That is, below the existing foundation 10 in the first area SA and the second area SB, a new foundation 12 is constructed according to the shape of the existing foundation 10, and between the new foundation 12 and the existing foundation 10. The base seismic isolation layer 16 (16
A, 16B) will be provided.

In this case, since the new foundation 12 is constructed according to the foundation shape of the existing building, the seismic isolation layer 16 below the foundation 10 has a step in the height direction. In the illustrated example, the base seismic isolation layer 16A in the first area SA is at a high position, and the base seismic isolation layer 16B in the second area SB is at a low position.

[0009]

However, in the space under the foundation 10 of the existing building 1, which is extremely limited and has severe conditions, the foundation seismic isolation layer 1 having such a step is formed.
In order to build No. 6, large-scale and highly difficult construction is required, and there is a problem that construction cost rises.

In consideration of the above-mentioned circumstances, the present invention can be applied even if there is a difference in the number of basement floors among a plurality of areas in the building plane.
It is an object of the present invention to provide a seismic isolation method for an existing building and a seismic isolated building that enable easy and low cost seismic isolation work.

[0011]

According to a first aspect of the present invention, the number of floors in the basement is different among a plurality of areas in the building plane,
As a result, in the seismic isolation method for an existing building in which the foundation of the building existing at the bottom of the basement has a step in the height direction, among the plurality of areas in which the number of floors of the basement is different, In the area of, a new foundation is constructed under the foundation of the building, and a base seismic isolation layer with a seismic isolation device interposed between the existing foundation and the new foundation is provided, and in other areas,
The feature is that an in-story seismic isolation layer with a seismic isolation device is provided in the underground floor above the existing foundation.

According to a second aspect of the present invention, in the seismic isolation method according to the first aspect, the other area in which the intra-layer seismic isolation layer is provided is
It is characterized in that the basement base isolation layer is an area having a larger number of floors than the first area in which the base isolation layer is provided.

According to a third aspect of the present invention, in the seismic isolation construction method according to the first or second aspect, the seismic isolation layer in the floor is provided in an intermediate floor above the lowermost floor of the basement floor. The feature is that the underground building parts below the floor where the inner seismic isolation layer is installed are left as unrepaired parts.

According to a fourth aspect of the present invention, in the seismic isolation construction method according to the third aspect, between the underground building portion to be left as the unrepaired portion and the structure above the intra-layer seismic isolation layer and the base seismic isolation layer. It is characterized by connecting the seismic isolation boundaries of the floor and wall of the building with expansion joints.

According to a fifth aspect of the present invention, in the seismic isolation construction method according to any one of the first to fourth aspects, the basement floor portion of the structure above the intra-layer seismic isolation layer and the base isolation layer is surrounded. To
It is characterized in that a retaining wall is provided at a distance from the basement and a seismic isolation pit is secured between the retaining wall and the basement.

The invention of claim 6 is characterized in that in the seismic isolation construction method of claim 5, the seismic isolation pit is located inside the outermost peripheral contour line of the existing building in plan view. There is.

According to a seventh aspect of the invention, in the seismic isolation construction method according to the sixth aspect, at least a part of the structure above the intra-layer seismic isolation layer and the base seismic isolation layer is provided by the upper end portion of the retaining wall. It is characterized by being supported via a seismic isolation device.

According to the invention of claim 8, the number of floors of the basement is different among a plurality of areas in the building plane, whereby the bottom of the basement has a step in the height direction,
In a first area among a plurality of areas having different floors of the basement, a foundation is constructed below the bottom of the basement, and seismic isolation is provided between the bottom of the basement and the foundation. In addition to providing the base seismic isolation layer with the device interposed, in other areas, the intra-layer seismic isolation layer with the seismic isolation device interposed in the floor of the basement above the bottom of the basement is provided. It has a feature.

According to a ninth aspect of the present invention, in the base-isolated building according to the eighth aspect, the other area in which the intra-layer seismic isolation layer is provided is located in the basement floor more than the first area in which the basic seismic isolation layer is provided. It is characterized by an area with many floors.

The invention of claim 10 is the seismic isolated building as claimed in claim 8 or 9, characterized in that the intra-layer seismic isolation layer is provided in an intermediate floor above the lowest floor of the basement floor. There is.

According to an eleventh aspect of the present invention, in the seismic isolated building according to the tenth aspect, the seismic isolation boundaries of the floor and the wall between the upper structure and the lower structure of the intra-layer seismic isolation layer are defined by: It is characterized by being connected by an expansion joint.

According to a twelfth aspect of the present invention, in the seismic isolated building according to any one of the eighth to eleventh aspects, the basement floor portion of the structure above the basic seismic isolation layer and the intra-story isolation layer is surrounded. A retaining wall is provided at a distance from the basement, and a seismic isolation pit is secured between the retaining wall and the basement.

According to a thirteenth aspect of the present invention, in the seismic isolation building according to the twelfth aspect, the seismic isolation pit is located inside the outermost peripheral contour line of the building in plan view. .

According to a fourteenth aspect of the present invention, in the seismic isolated building according to the thirteenth aspect, at least a part of the structure above the basic seismic isolation layer and the intra-story seismic isolation layer is isolated by the upper end portion of the retaining wall. It is characterized by being supported via a seismic device.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of the seismic isolation method of the embodiment. Existing buildings that are subject to seismic isolation here 1
Has a ground floor portion 2 and a basement floor portion 3, and the number of floors of the basement floor portion 3 is two areas SA and SB in the building plane.
It is a building that is different between them. That is, the first area SA
In the basement floor, the number of floors is 2, but in the second area S
In B, the number of basements is three. Then, as a result, the foundation 10 of the building existing at the bottom of the basement has a step in the height direction. Here, 1st basement floor, 2
The floors and the third floor are denoted by reference numerals 31, 32, and 33, respectively.

In seismic isolation of the existing building 1 in which the number of basement floors differs among a plurality (two in the illustrated example) of areas SA and SB in the plane of the building, the number of basement floors is small. In area 1 (area of shallow depth of basement) SA,
A new foundation 12A is constructed below the foundation 10 of the building, and a base seismic isolation layer 16A having a seismic isolation device 15 interposed between the existing foundation 10 and the new foundation 12A is provided.

On the other hand, in the second area (area having a deep underground floor) SB, which has a large number of underground floors, in the intermediate intermediate floor above the existing foundation 10 (second underground floor 32 in the illustrated example). The intra-layer seismic isolation layer 26B with the seismic isolation device 15 interposed therein is provided. Then, by providing the intra-floor seismic isolation layer 26B in the intermediate floor above the lowest floor of the basement part 3, the underground building portion below the floor where the intra-floor isolation layer 26B is provided is left as a non-repair part. . That is, since the basement floor portion 3 has a basement floor 3 (bottom floor) 33, a basement floor 32, and a basement floor 31, a seismic isolation layer 26B within the floor is provided above the basement floor 32 (near the ceiling). By providing, the underground building portion (lower half of the second basement 32 and the third basement) below that is left as an unrepaired portion.

In this case, the seismic isolation device 15 cuts the edges of the upper and lower columns 4 in the upper part of the second basement and is interposed between the upper and lower columns 4. Further, the pillar 4 below the position where the seismic isolation device 15 is interposed has a reinforcing structure 2 for increasing the buckling strength.
1 is set.

When the intra-layer seismic isolation layer 26B is provided in the intermediate floor in this way, seismic isolation boundaries (preliminarily cut edges or portions cut off at the time of an earthquake) exist on the floor or wall of the intermediate floor. Will be done. Therefore, expansion joints 22 and 23 are arranged on such seismic isolation boundaries to connect the floors and walls, thereby maintaining the apparent continuity of the floors and walls. By interposing the expansion joints 22 and 23 in this way, the displacement at the time of an earthquake can be absorbed by the expansion joints 22 and 23, and local destruction of the floor or wall can be avoided.

A retaining wall 17 is provided at a distance from the basement floor so as to surround the basement floor of the structure above the intra-layer seismic isolation layer 26B and the base isolation layer 16A.
The seismic isolation pit 18 is secured between the basement and the basement.
Retaining wall 17 is intra-layer seismic isolation layer 26B and basic seismic isolation layer 16A.
Start up from the lower structure.

In the seismic isolation construction method which is constructed in this way, the foundation seismic isolation layer 16A is not uniformly provided below the existing foundation 10 over the entire surface of the building, but only in a partial area SA. Since the seismic isolation layer 16A is provided, and in the other area SB, the intra-layer seismic isolation layer 26B is provided above the existing foundation 10 and in the intermediate floor of the basement portion 3, it is difficult to construct the foundation. Since the seismic isolation layer 16A does not have to be stepped, the repair work can be easily performed, and the construction cost can be reduced.

In particular, in the second area SB having a large number of floors in the basement floor portion 3, the intra-layer seismic isolation layer 26B is provided, and the basic seismic isolation layer 16 is provided.
Since the area where A is provided is limited to the first area SA, which has a small number of floors in the basement portion 3, it is possible to minimize the large-scale renovation work that is performed on the lower side of the existing foundation 10, thus reducing the work burden. Can be significantly reduced.

Also, since the lowest floor (3rd basement 33) of the second area SB, which is mainly used as a room necessary for maintaining the functions of the entire building such as the machine room, is left as an unrepaired part, the function of the entire building is maintained. It is possible to proceed with seismic isolation work without damaging the building as much as possible, and it is possible to minimize the impact of renovation work. In other words, the repair work for seismic isolation can be performed while using the upper floor of the building as usual.

Further, since the seismic isolation pit 18 is provided so as to surround the basement floor of the structure above the seismic isolation layers 16A and 26B, horizontal displacement of the structure above the seismic isolation layers 16A and 26B that occurs during an earthquake. Can be permitted in the seismic isolation pit 18, and an effective seismic isolation function can be exhibited.

As in another embodiment of FIG. 2, if the retaining wall 27 is provided so as to be located inside the outermost contour line of the existing building 1 when the seismic isolation pit 28 is viewed in plan,
Since the seismic isolation pit 28 does not protrude outside the planar shape of the upper part of the building, the site can be effectively used. In addition, the seismic isolation method can be applied even when there is no room on the site.

Further, when the seismic isolation pit 28 is positioned inside the outermost peripheral contour line of the existing building 1 in such a plan view, a part of the upper structure is present above the seismic isolation pit 28. Although it overhangs in the overhang state, since that portion is supported by the retaining wall 28 via the seismic isolation device 15, it can be maintained in a structurally stable state.

Although the case where the seismic isolation method is applied to an existing building has been described above, the same method can be applied to a newly built building. Hereinafter, a seismic isolated building constructed by applying the same construction method will be described with reference to FIG.

Although the reference numeral 1 in FIG. 1 is an existing building in the above description, it is considered to be a newly constructed seismic isolated building here. This base-isolated building 1 has a ground floor portion 2 and a basement floor portion 3, and the number of floors of the basement floor portion 3 is different between the two areas SA and SB in the building plane. In the first area SA, the number of basements is two, and in the second area SB, the number of basements is three. And thereby, the bottom portion 10 of the basement (the first area SA
In some cases, there may be no special foundation, so
(Here, not the basics, but simply the bottom)
However, it has a step in the height direction.

In the first area SA of the base-isolated building 1, a foundation 12A (which is not a new foundation because it is entirely new here) is constructed below the bottom 10 of the building, The base seismic isolation layer 16A is provided by interposing the seismic isolation device 15 between the bottom 10 of the base and the foundation 12A.

In the second area SB, the bottom portion 1 of the building is
Underground intermediate floors above 0 (in the example shown, the second basement 3
The seismic isolation device 15 is provided in 2), so that the intra-layer seismic isolation layer 26B is provided.

In addition, the reinforcement structure 21 is provided on the lower column 4 of the intra-layer seismic isolation layer 26B, that is, the intra-layer seismic isolation layer 26B.
The fact that the expansion joints 22 and 23 are provided at the seismic isolation boundary and the point that the seismic isolation pit 18 is provided by the retaining wall 17 are the same as the contents of the seismic isolation method for the existing building.

In the seismic isolation building 1 having such a structure, the basic seismic isolation layer 16A is not provided uniformly over the entire surface of the building, but the basic seismic isolation layer 16A is provided only in a partial area SA.
In the other area SB, since the intra-floor seismic isolation layer 26B with the seismic isolation device 15 interposed is provided in the floor of the basement part 3, it is difficult to construct the basic seismic isolation layer 16B.
Since there is no step on A, the construction can be done easily and the construction cost can be reduced. Especially, the basic seismic isolation layer 16A
Since the area in which is provided is limited to the shallow area SA of the basement floor, large-scale construction for making the base isolation layer 16A can be minimized and the construction load can be reduced.

Further, the expansion joint 22,
The effect of providing 23 and providing the seismic isolation pit 18 is the same as in the case of the seismic isolation construction method for the existing building. Further, also in the case of a newly-built seismic isolated building, as shown in FIG. 2, by arranging the seismic isolated pit 28 inside the outermost peripheral contour line of the building, the same effect as described above can be obtained.

In the above embodiment, the case where the intra-layer seismic isolation layer 26B is provided on the second basement 32 is shown.
The intra-layer seismic isolation layer 26B may be provided on any floor as long as it is above the foundation 10. For example, it is possible to provide an intra-layer seismic isolation layer on the basement floor 33, which is the lowest floor, and set it at the same level as the basic seismic isolation layer 16A. In addition, seismic isolation layer 26B
May be provided at any position within the plane of the building, and the level and the planar position where it is provided are not particularly limited.

The number of floors of the basement floor of the building and the number of areas of the basement floor having different floors are not limited to those in the above embodiment.

[0046]

As described above, according to the seismic isolation construction method of the invention of claim 1, a seismic isolation layer (a basic seismic isolation layer) is uniformly provided below the existing foundation with respect to the entire surface of the building. Rather than installing it, only in some areas, a seismic isolation layer (base seismic isolation layer) is provided under the existing foundation, and in other areas, it is in the basement floor above the existing foundation. Since a seismic isolation layer (intra-layer seismic isolation layer) is provided, there is no need to make a step on the foundation seismic isolation layer, which is difficult to construct, and repair work can be done easily. Can be reduced.

According to the seismic isolation method of the second aspect of the invention, an intra-layer seismic isolation layer is provided in the area of the basement floor where the number of floors is large (that is, the area where the depth of the basement of the building is deep). The area where the seismic layer is provided is limited to the shallow underground area. Therefore, it is possible to minimize the large-scale repair work under the existing foundation. In particular, since it is not necessary to refurbish the lower side of the existing foundation in the deep underground area, the burden of construction can be reduced.

According to the seismic isolation method of the third aspect of the invention, the seismic isolation work is performed while leaving the underground building portion below the middle floor where the seismic isolation layer in the floor is provided, for example, the lowermost floor of the basement as a non-repaired portion. Therefore, if a room such as a machine room that is required to maintain the functions of the entire building is located on the lowest floor of the basement, leave that part without repairing the work without damaging the functions of the entire building as much as possible. It is possible to proceed, and the impact of renovation work can be minimized.

According to the seismic isolation method of the invention of claim 4, when the seismic isolation layer within the floor is provided in the intermediate floor above the lowest floor of the basement floor, the seismic isolation boundary is provided on the floor or wall of the intermediate floor. However, since the seismic isolation boundaries of such floors and walls are connected by expansion joints, displacements during earthquakes can be absorbed by the expansion joints, and local destruction of floors and walls can occur. Can be avoided.

According to the seismic isolation construction method of the invention of claim 5, since the seismic isolation pit is provided so as to surround the basement portion of the structure above the seismic isolation layer, the seismic isolation layer above the seismic isolation layer is generated. Horizontal displacement of structures can be allowed in the seismic isolation pit, and effective seismic isolation function can be demonstrated.

According to the seismic isolation construction method of the invention of claim 6, the seismic isolation pit is provided inside the outermost peripheral contour line of the existing building in plan view, so that the seismic isolation pit is formed from the planar shape of the upper part of the building. The site can be used effectively because it does not extend outside. In addition, the seismic isolation method can be applied even when there is no room on the site.

According to the seismic isolation construction method of the invention of claim 7, when the seismic isolation pit is located inside the outermost peripheral contour line of the existing building in plan view, the seismic isolation pit is located above the seismic isolation pit. Part of the structure may overhang and the support may become unstable, but since that part is supported by the retaining wall via the seismic isolation device, it is possible to maintain a structurally stable state. .

According to the seismic isolation building of the invention of claim 8, the basic seismic isolation layer is not provided uniformly over the entire surface of the building, but the basic seismic isolation layer is provided only in a part of the area, and In the area, since the seismic isolation layer with the seismic isolation device is installed in the floor of the basement floor, there is no step on the base seismic isolation layer, which is difficult to construct. As a result, the construction period and construction cost can be reduced.

According to the seismic isolation building of the invention of claim 9, the seismic isolation layer within the floor is provided in the area of the basement floor where the number of floors is large (that is, the area where the depth of the basement of the building is deep). Since the area to be provided is limited to the area with a shallow depth, it is possible to minimize the large-scale construction for making the base isolation layer.

According to the seismic isolated building of the tenth aspect of the invention, since the seismic isolation layer is provided in the middle floor of the basement floor, the basement floor portion below the seismic isolation layer can be treated as a separate construction. it can.

According to the seismic isolated building of the invention of claim 11, when the seismic isolation layer within the floor is provided in the intermediate floor above the lowest floor of the basement floor, the floor or wall of the intermediate floor has a seismic isolation boundary. Although existing, the seismic isolation boundaries of such floors and walls are connected by expansion joints, so displacements during earthquakes can be absorbed by expansion joints, and local destruction of floors and walls is avoided. be able to.

According to the seismic isolation building of the invention of claim 12, since the seismic isolation pit is provided so as to surround the basement floor of the structure above the seismic isolation layer, the structure above the seismic isolation layer that occurs during an earthquake Horizontal displacement of objects can be allowed in the seismic isolation pit, and effective seismic isolation function can be demonstrated.

According to the seismic isolated building of the thirteenth aspect of the present invention, by providing the seismic isolated pit inside the outermost peripheral contour line of the building in plan view, the seismic isolated pit is outside the planar shape of the upper part of the building. Since it does not overflow, it is possible to make effective use of the site. In addition, seismic isolation is possible even when there is no room on the site.

According to the seismic isolated building of the invention of claim 14, when the seismic isolated pit is located inside the outermost peripheral contour line of the building in plan view, the seismic isolated pit is located above the seismic isolated pit. There is a possibility that a part of it may be overhanging and become unstable in support, but since that part is supported by the retaining wall via the seismic isolation device, it is possible to maintain a structurally stable state.

[Brief description of drawings]

FIG. 1 is a cross-sectional view used to describe an embodiment of the present invention.

FIG. 2 is a sectional view used to describe another embodiment of the present invention.

3A and 3B are explanatory views of a conventional seismic isolation method, in which FIG. 3A is a sectional view showing a state before seismic isolation, and FIG. 3B is a sectional view showing a state after seismic isolation.

[Explanation of symbols]

1 Existing building (seismic isolation building) 3 Basement 10 Existing foundation (bottom) 12A New foundation (foundation) 15 Seismic isolation device 16A Basic seismic isolation layer 17,27 Retaining wall 18,28 Seismic isolation pit 22,23 Expansion joint 26B seismic isolation layer SA first area SB Second area

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04G 23/02 E04B 1/18 E04B 1/98 E04H 9/02 301 E02D 27/34

Claims (14)

(57) [Claims] 1. The number of basements is different among a plurality of areas in a building plane, whereby the foundation of the building existing at the bottom of the basement is of an existing building having a step in the height direction. In the seismic isolation method, among the plurality of areas where the number of basements is different, in the first area, a new foundation is constructed below the foundation of the building, and the existing foundation and the new foundation are combined. In addition to providing a base seismic isolation layer with a seismic isolation device interposed between them, in other areas, an intra-story seismic isolation layer with a seismic isolation device intervening is provided in the basement floor above the existing foundation. A seismic isolation method for existing buildings. 2. Another area in which the intra-layer seismic isolation layer is provided is
The method for seismic isolation of an existing building according to claim 1, wherein the base isolation layer is an area having a larger number of floors than the first area in which the base isolation layer is provided. 3. The base-isolation layer within the floor is provided in an intermediate floor above the lowest floor of the basement floor, so that the underground building portion below the floor where the base-isolation layer within the floor is provided remains as an unrepaired portion. The seismic isolation method for an existing building according to claim 1 or 2, characterized in that. 4. An expansion joint is used to connect the seismic isolation boundaries of the floor and wall between the underground building portion to be left as the non-repaired portion and the structure above the base isolation layer and the base isolation layer. The seismic isolation method for an existing building according to claim 3. 5. A retaining wall is provided at a distance from the basement floor portion so as to surround the basement floor portion of the structure above the base isolation layer and the base isolation layer, and the retaining wall and the basement are provided. A seismic isolation pit is secured between the floor and the floor.
The seismic isolation method for the existing building described in any of 4 above. 6. The method for seismic isolation of an existing building according to claim 5, wherein the seismic isolation pit is located inside an outermost peripheral contour line of the existing building in a plan view. 7. The at least part of the structure above the intra-layer seismic isolation layer and the foundation seismic isolation layer is supported by an upper end portion of the retaining wall via a seismic isolation device. Seismic isolation method for existing buildings as described. 8. In a building in which the number of basement floors differs among a plurality of areas in the building plane, and thus the bottom of the basement floor has a step in the height direction, the number of basement floors is different. In a first area of the plurality of areas, a foundation is constructed below the bottom of the basement, and a seismic isolation device is interposed between the bottom of the basement and the other foundation. In addition to the basic seismic isolation layer, in other areas, an intra-story seismic isolation layer is provided in which a seismic isolation device is interposed in the floor of the basement above the bottom of the basement. building. 9. The other area where the intra-layer seismic isolation layer is provided,
The base-isolated building according to claim 8, wherein the base-isolated layer has a larger number of floors than the first area in which the base isolation layer is provided. 10. The seismic isolated building according to claim 8 or 9, wherein the intra-layer seismic isolation layer is provided in an intermediate layer above the lowest floor of the basement floor. 11. The seismic isolation boundary of the floor and the wall between the upper structure and the lower structure of the intra-layer seismic isolation layer is connected by an expansion joint.
Seismic isolation building described in 0. 12. A retaining wall is provided at a distance from the basement floor portion so as to surround the basement floor portion of the structure above the basic seismic isolation layer and the intra-layer seismic isolation layer, and the retaining wall and the basement are provided. 9. A seismic isolation pit is secured between the floor and the floor.
The seismic isolated building according to any one of to 11. 13. The seismic isolated building according to claim 12, wherein the seismic isolated pit is located inside an outermost contour line of the building in a plan view. 14. The seismic isolation device according to claim 1, wherein at least a part of a structure above the base seismic isolation layer and the intra-story seismic isolation layer is supported by an upper end portion of the retaining wall via a seismic isolation device.
Seismic isolation building described in 3.