Reinforced concrete and wooden earthquake-resistant high-rise buildings

Abstract

To provide a base-isolated high-rise building that can properly perform its base isolation function by ensuring sufficient superimposed load while suppressing the acceleration that occurs in the upper floors of a wooden hybrid structure during an earthquake. [Solution] A seismically isolated high-rise building is constructed including a lower floor 20 made of reinforced concrete and an upper floor 30 made of a wooden hybrid structure, wherein an intermediate seismic isolation layer 40 is provided between the top floor 22 and the lower floor 21 of the lower floor 20. The top floor, the second floor 22, is made of reinforced concrete, including the portion of the ceiling slab 23 that also serves as the floor slab of the third floor 31a, the lowest floor of the upper floor 30, thereby ensuring that the superimposed load on the seismic isolation devices at multiple locations is secured.

Description

Technical Field

[0001] The present invention relates to a seismic isolation high-rise building made of reinforced concrete and wood, and particularly to a seismic isolation high-rise building made of reinforced concrete and wood, which includes a lower layer composed of multiple floors with a reinforced concrete structure and an upper layer composed of multiple floors with a wood hybrid structure.

Background Art

[0002] Preferably, as part of recent efforts towards ESG / SDGs, for example, for mid-rise to high-rise buildings, it is recommended to construct them using a large amount of wood materials. Wood materials require less energy for processing compared to other materials, and their long-term use at multiple stages contributes to preventing global warming and forming a recycling-oriented society. Also, since they can absorb carbon dioxide and fix carbon, they are attracting attention from the perspective of decarbonization. [[ID=,13]]

[0003] In addition, when constructing mid-rise to high-rise buildings using wood materials, it is considered that the strength is likely to be insufficient. Therefore, for the purpose of efficiently ensuring a predetermined strength while using a large amount of wood materials, hybrid buildings constructed using wood materials and non-wood materials formed of steel frames or concrete (for example, see Patent Document 1), and wooden-RC (reinforced concrete) mixed structure buildings constructed by combining wood construction and RC construction (for example, see Patent Document 2 and Non-Patent Document 1) have been developed.

[0004] Furthermore, in Japan, where earthquakes are frequent, there is a demand for buildings, such as mid-to-high-rise and high-rise buildings, to be equipped with seismic isolation functions. For example, mid-to-high-rise seismically isolated buildings with a wooden hybrid structure have been developed, which combines wood and reinforced concrete (RC) construction with seismic isolation functions (see, for example, Non-Patent Documents 2 and 3). In the wooden hybrid seismically isolated buildings described in Non-Patent Documents 2 and 3, since it is difficult to provide seismic isolation functions to the wooden portion, base isolation is employed. Base isolation involves, for example, installing seismic isolation devices between multiple lower concrete base sections that protrude upward from the foundation slab in a reinforced concrete underground pit, which together with the foundation piles to form the foundation of the building, and multiple upper concrete base sections that protrude downward from the reinforced concrete base slab, which is the base of the building that transmits the building's load to the foundation slab. By enabling the lateral relative movement of the building with respect to the foundation slab via the seismic isolation devices, it is possible to provide seismic isolation functionality to wooden hybrid structures. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2019-100057 [Patent Document 2] Japanese Patent Publication No. 2024-104599 Public Relations [Non-patent literature]

[0006] [Non-Patent Document 1] Dai-ichi Life Insurance Company, Limited, Shimizu Corporation, 'Plan for a rental office building with a wooden hybrid structure in Kyobashi, Chuo-ku, Tokyo: First in the insurance industry to be selected for the Sustainable Building Leading Project (Wooden Leading Type)', [online], February 28, 2023, Shimizu Corporation, [Retrieved September 26, 2024], Internet<URL:https: / / www.shimz.co.jp / company / about / news-release / 2023 / 2022074.html> [Non-Patent Document 2] Yoshihiro Sasaki, et al., 'Technical Report: Mid-rise Apartment Building with Wood Hybrid Structure - Anesis Chayagasaka -', [online], April 2021, GBRC Journal Vol. 46 No. 2, [Retrieved September 26, 2024], Internet<URL:https: / / www.gbrc.or.jp / assets / documents / gbrc / GBRC184_889.pdf> [Non-Patent Document 3] Fumiki Nakamura, et al., 'Technical Report: Nagato City Hall - Aiming to be a Model Project for Large-Scale Layered Wooden Structures -', [online], July 2020, GBRC Journal Vol. 45 No. 3, [Retrieved September 27, 2024], Internet<URL:https: / / www.gbrc.or.jp / assets / documents / gbrc / GBRC181_873.pdf> [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, in wooden hybrid structures equipped with seismic isolation through base isolation, as described in Non-Patent Documents 2 and 3, the underground pit for providing base isolation must occupy a planar area larger than the planar area of ​​the building's base, considering that the building should be able to move considerably laterally relative to the foundation slab in response to earthquake shaking. This imposes constraints on the design of the building within a limited site area. Furthermore, since wooden hybrid structures are lighter and more flexible than reinforced concrete structures, the amplitude of vibrations in the upper floors tends to increase when the building is made taller. For these reasons, there is a need for the development of new technologies that can efficiently and effectively provide seismic isolation functionality to wooden hybrid structures, such as high-rise buildings of six stories or more, so that the building can continue to be supported in a stable state during earthquakes.

[0008] For these reasons, in Japanese Patent Application No. 2024-199462 filed on the same date, the applicant has newly developed a reinforced concrete and wooden high-rise building with seismic isolation, which includes a lower floor consisting of multiple floors made of reinforced concrete and an upper floor consisting of multiple floors made of a wooden hybrid structure, and which is equipped with an intermediate seismic isolation layer interposed between the lower and upper floors of the reinforced concrete lower floor to provide seismic isolation functionality.

[0009] Furthermore, in the case of a reinforced concrete lower floor structure, if an intermediate seismic isolation layer is installed between the lower and upper floors, it is thought that by placing the intermediate seismic isolation layer between the top floor of the lower floor and the lower floor directly below it, and by installing the intermediate seismic isolation layer as high as possible in the lower floor, it will be possible to effectively suppress the acceleration that occurs in the upper floor structure, which is a wooden hybrid structure, during an earthquake. On the other hand, if the intermediate seismic isolation layer is installed as high as possible in the lower floor, a technical challenge arises in that it may not be possible to secure sufficient superimposed load to allow the intermediate seismic isolation layer to exert its proper seismic isolation function during an earthquake.

[0010] The present invention aims to provide reinforced concrete and wooden high-rise buildings with seismic isolation that can efficiently and effectively provide seismic isolation functionality without base isolation, even in high-rise buildings of six stories or more, including wooden hybrid structures, so that the building can continue to be supported in a stable state during an earthquake. Furthermore, it aims to provide reinforced concrete and wooden high-rise buildings with seismic isolation that can properly perform seismic isolation functions during an earthquake by ensuring sufficient superimposed loads while suppressing the acceleration that occurs in the upper floors of wooden hybrid structures. [Means for solving the problem]

[0011] The present invention relates to a reinforced concrete and wooden high-rise building with seismic isolation, comprising a lower floor consisting of multiple floors made of reinforced concrete and an upper floor consisting of multiple floors made of a wooden hybrid structure, wherein an intermediate seismic isolation layer is provided between the top floor and the lower floor of the reinforced concrete lower floor, and the intermediate seismic isolation layer has seismic isolation operating parts provided at multiple locations distributed between the floor slab of the top floor and the ceiling slab of the lower floor, and each of the seismic isolation operating parts has an upper concrete base that protrudes downward as a whole from the floor slab of the top floor and a part that protrudes downward as a whole from the ceiling slab of the lower floor The structure includes a lower concrete base portion that protrudes upward and a seismic isolation device that is installed sandwiched between these concrete base portions, and the intermediate concrete wall of the intermediate seismic isolation layer, including the outer perimeter wall that is erected between the floor slab of the top floor and the ceiling slab of the lower floor, is formed in a state where it is divided vertically by seismic isolation slits, and the top floor, including the portion of the ceiling slab that also serves as the floor slab of the lowest floor of the upper layer, is a reinforced concrete structure, thereby ensuring that the superimposed load on the seismic isolation devices at multiple locations, thereby achieving the above objective by providing a reinforced concrete and wooden seismic isolation high-rise building.

[0012] Furthermore, in the reinforced concrete and wooden seismically isolated high-rise building of the present invention, the second floor of the lower floor is designated as the top floor, the first floor as the lower floor, and the intermediate seismic isolation layer is interposed between them. Preferably, the ceiling slab of the top floor, which also serves as the floor slab of the lowest floor of the upper floor, is the ceiling slab of the second floor, which also serves as the floor slab of the third floor.

[0013] Furthermore, in the reinforced concrete and wooden high-rise seismically isolated building of the present invention, a reinforced concrete elevator shaft is provided extending downward to the floor slab of the lowest floor of the lower floor, with the elevator shaft extending vertically through the upper floor, which is a wooden hybrid structure, and supported by the floor slab of the top floor that forms the intermediate seismic isolation layer, at least. Preferably, the elevator shaft is inserted into the openings formed in the ceiling slab of the lower floor that forms the intermediate seismic isolation layer, while maintaining a predetermined distance between the opening edge of the insertion opening formed in the ceiling slab of the lower floor and the opening edge of the insertion opening formed in the floor slab of at least the lower floor below. [Effects of the Invention]

[0014] According to the seismically isolated high-rise buildings made of reinforced concrete and wood of the present invention, even in high-rise buildings of six stories or more, including wooden hybrid structures, it is possible to efficiently and effectively provide seismic isolation functionality without using base isolation, so that the building can continue to be supported in a stable state during an earthquake. Furthermore, it is possible to ensure sufficient superimposed load while suppressing the acceleration that occurs in the upper floors of the wooden hybrid structure during an earthquake, thereby allowing the seismic isolation function of the intermediate floor isolation layer to be properly exercised during an earthquake. [Brief explanation of the drawing]

[0015] [Figure 1] This is a broken perspective view showing a reinforced concrete and wooden earthquake-resistant high-rise building with the outer walls removed, illustrating a preferred embodiment of the present invention. [Figure 2]It is a schematic cross-sectional view taken along A-A of FIG. 5, which illustrates a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 3] It is a schematic cross-sectional view taken along B-B of FIG. 5, which illustrates a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 4] It is a schematic cross-sectional view taken along C-C of FIG. 2, which illustrates a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 5] It is a schematic cross-sectional view taken along D-D of FIG. 2, which illustrates a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 6] It is a schematic cross-sectional view taken along E-E of FIG. 2, which illustrates a seismic isolation high-rise building made of reinforced concrete and wood according to a preferred embodiment of the present invention. [Figure 7] It is an enlarged view of part F of FIG. 2, which illustrates the seismic isolation slit provided in the intermediate floor concrete wall.

Embodiments for Carrying Out the Invention

[0016] A preferred embodiment of the present invention, a reinforced concrete and wooden seismically isolated high-rise building 10, is preferably a high-rise building of six stories or more, for example, an eight-story building, as shown in Figure 1. The seismic isolation function allows the building to remain stable during an earthquake. The seismically isolated high-rise building 10 of this embodiment is a reinforced concrete and wooden building that includes a lower floor 20 consisting of, for example, two floors made of reinforced concrete, and an upper floor 30 consisting of, for example, six floors made of a wooden hybrid structure. The planar area of ​​the upper floor 30 made of the wooden hybrid structure is preferably smaller than the planar area of ​​the lower floor 20 made of reinforced concrete, and the upper floor 30 is provided in a state where it is positioned to the west, for example, as a predetermined direction in the planar area of ​​the lower floor 20 (see Figures 1, 2, 5, and 6). The seismically isolated high-rise building 10 of this embodiment is a reinforced concrete and wooden building in which seismic isolation is provided without employing base isolation. This allows for efficient building design within a limited site without being constrained by the occupied area of ​​an underground pit required for base isolation, and also ensures sufficient superimposed load while suppressing the acceleration generated in the upper floors 30 of the wooden hybrid structure during an earthquake, thereby allowing the seismic isolation function of the intermediate floor isolation layer 40 to be properly performed during an earthquake.

[0017] Then, as shown in FIG. 1, the seismic isolation high-rise building 10 made of reinforced concrete and wood in this embodiment includes a lower layer 20 composed of multiple floors of reinforced concrete structure (preferably two floors in this embodiment), and an upper layer 20 composed of multiple floors of wood hybrid structure (preferably six floors in this embodiment), and is, for example, an eight-story high-rise building. As also shown in FIGS. 2 and 3, an intermediate floor seismic isolation layer 40 is provided between the top floor (preferably the second floor in this embodiment) 22 and the lower floor (preferably the first floor in this embodiment) 21 in the lower layer 20 of reinforced concrete structure. The intermediate floor seismic isolation layer 40 has seismic isolation operating parts 43 distributed and provided at multiple locations intervening between the floor slab 42 of the top floor 22 and the ceiling slab 41 of the lower floor 21 (see FIG. 4). Each seismic isolation operating part 43 includes an upper concrete pedestal part 42a integrally protruding downward from the floor slab 42 of the top floor 22, a lower concrete pedestal part 41a integrally protruding upward from the ceiling slab 41 of the lower floor 21, and a seismic isolation device 47 attached so as to be sandwiched between these concrete pedestal parts 41a, 42a. And the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40 including the outer peripheral wall 45a erected between the floor slab 42 of the top floor 22 and the ceiling slab 41 of the lower floor 21 is formed in a state of being vertically divided by seismic isolation slits 46 (see FIGS. 2 and 7). The second floor 22, which is the top floor, has a reinforced concrete structure including a part of the ceiling slab 23 that also serves as the floor slab of the third floor 31a, which is the bottom floor of the upper layer 30, so as to ensure the upper loading on the seismic isolation devices at multiple locations.

[0018] Furthermore, in the seismically isolated high-rise building 10 of this embodiment, as shown in Figure 3, preferably an upper floor 30 made of a wooden hybrid structure, a reinforced concrete elevator shaft 35 is provided so as to penetrate vertically, supported by the floor slab 42 of the second floor 22, which is the top floor forming at least the intermediate seismic isolation layer 40, and extending downward to a height reaching the floor slab 21a of the first floor 21, which is the lowest floor of the lower floor 20. This elevator shaft 35 is inserted into the insertion openings 41b, 21b, while maintaining a predetermined distance 41c, 21c between the opening edge of the insertion opening 41b formed in the ceiling slab 41 of the first floor 21, which is the lower floor forming the intermediate seismic isolation layer 40, and the opening edge of the insertion opening 21b formed in the floor slab 21a of the first floor 21, which is at least the lower floor below, and these insertion openings 41b, 21b.

[0019] In this embodiment, the seismically isolated high-rise building 10 is constructed, for example, as an employee dormitory, as shown in Figures 1 to 3. The first floor 21, which is the lowest floor of the lower floor 20, a two-story reinforced concrete structure, is formed as a public space mainly equipped with a dining hall, bathhouse, garbage disposal area, etc. The second floor 22 of the lower floor 20, which is separated by the intermediate seismic isolation layer 40, and the third to eighth floors above the lower floor 20, which are a wooden hybrid structure, are formed as living spaces with multiple private rooms for each employee. In this embodiment, the intermediate seismic isolation layer 40, which provides seismic isolation functionality, is formed as a dedicated seismically isolated space that is not normally accessed by residents, in the area between the first floor 21, which is formed as a public space, and the second floor 22, which is formed as a living space, in the lower floor 20, which is a reinforced concrete structure.

[0020] In this embodiment, the intermediate floor seismic isolation layer 40 constituting the seismically isolated high-rise building 10 is interposed between the first floor 21, which is the lowest floor, and the second floor 22, which is the highest floor, of the lower floor 20, which is a reinforced concrete structure, and is provided so as to fit within the same planar area as these lower floors 21 and 22 without protruding outward from them. The intermediate floor seismic isolation layer 40 is composed of a ceiling slab 41 of the first floor 21, which is also the floor slab of the intermediate floor seismic isolation layer 40, a floor slab 42 of the second floor 22, which is also the ceiling slab of the intermediate floor seismic isolation layer 40, and a plurality of seismic isolation operating parts 43 interposed between the ceiling slab 41 of the first floor 21 and the floor slab 42 of the second floor 22, supporting the ceiling slab 41 so that it can move laterally relative to the floor slab 42. Furthermore, the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40, including the outer perimeter wall 45a, which is erected between the ceiling slab 41 of the first floor 21 and the floor slab 42 of the second floor 22, is formed in a state where it is divided vertically by seismic isolation slits 46, without supporting any load from above via the ceiling slab 41, as shown in Figures 2 and 7.

[0021] The floor slab 42 of the second floor 22 constituting the seismically isolated high-rise building 10 is made of cast-in-place concrete poured by a known method after the formwork for the slab is appropriately assembled together with temporary scaffolding. As shown in Figures 1 and 2, the floor slab 42 is preferably formed integrally with the ceiling beams 44, which are arranged in a grid pattern at predetermined intervals in the vertical and horizontal directions on the ceiling portion of the intermediate seismic isolation layer 40 and supported by these ceiling beams 44. Multiple upper concrete base portions 42a are provided on the floor slab 42, each projecting downward from the intersections of the grid-like ceiling beams 44 on its underside with a projection height of, for example, about 1800 mm, and preferably having a rectangular plan shape with dimensions of about 1500 to 1800 mm in both length and width, distributed vertically and horizontally (see Figure 4).

[0022] The ceiling slab 41 of the first floor 21, which constitutes the base-isolated high-rise building 10, is also made of cast-in-place concrete poured by a known method, with the slab formwork appropriately assembled together with temporary scaffolding. The ceiling slab 41 is supported by floor beams 48 which are arranged in a grid pattern at predetermined intervals in the vertical and horizontal directions in the floor portion of the intermediate base isolation layer 40, and is formed integrally with these floor beams 48. On the upper side of the ceiling slab 41, at positions corresponding to the multiple upper concrete base portions 42a that protrude downward from the floor slab 42 of the second floor 22, there are multiple lower concrete base portions 41a, preferably with a rectangular cross-sectional shape similar to the upper concrete base portions 42a, with dimensions of approximately 1500 to 1800 mm in both length and width, each protruding upward with a projection height of, for example, about 500 mm, and are distributed vertically and horizontally (see Figure 4).

[0023] Furthermore, between the multiple upper concrete base portions 42a that protrude downward from the floor slab 42 of the second floor 22 and the multiple lower concrete base portions 41a that protrude upward from the ceiling slab 41 of the first floor 21, known seismic isolation devices 47, such as high-damping rubber laminated bearings, elastic sliding bearings, and linear rolling bearings, are installed so as to be sandwiched between these upper and lower base portions 41a and 42a. As a result, seismic isolation operating units 43, which include the lower concrete base portions 41a, the upper concrete base portions 42a, and the seismic isolation devices 47, are interposed between the ceiling slab 41 of the lower floor 21 and the floor slab 42 of the upper floor 22 and are provided at multiple locations. This also makes it possible to support the ceiling slab 41 from the floor slab 42 so as to allow relative movement in the lateral direction by the multiple seismic isolation operating units 43.

[0024] Furthermore, in this embodiment, as shown in Figure 4, known damper devices 49 can be installed at multiple locations in the intermediate floor seismic isolation layer 40 at appropriate positions. The damper devices 49 can be installed by connecting one end to the ceiling slab 41 of the first floor 21 and the other end to the floor slab 42 of the second floor 22, for example, by extending two damper devices 49 in the east-west direction and three damper devices 49 in the north-south direction. Because the damper devices 49 are installed at multiple locations in the intermediate floor seismic isolation layer 40 at appropriate positions, the stress due to the resistance of the damper devices 49 is distributed and transmitted, making it possible to reduce displacement during an earthquake without concentrating large stresses locally.

[0025] In this embodiment, the intermediate floor concrete wall 45, including the outer perimeter wall 45a, which is erected between the ceiling slab 41 of the first floor 21 and the floor slab 42 of the second floor 22 and installed in the intermediate floor seismic isolation layer 40, is formed in a state where it is divided vertically by seismic isolation slits 46. The seismic isolation slits 46 are formed by creating slit-shaped gaps, preferably with a spacing of about 50 mm, at a predetermined height position in the intermediate portion of the intermediate floor concrete wall 45 in the height direction, traversing the intermediate floor concrete wall 45 throughout the entire intermediate floor seismic isolation layer 40. As shown in Figure 7, for example, in the outer perimeter wall 45a, the gaps formed by the seismic isolation slits 46 are preferably filled with a gap-filling material 46a such as rock wool or fire-resistant joint material, and a trim material 46b, for example made of aluminum, can be attached to cover the gaps formed by the seismic isolation slits 46 from the outside. This makes it possible to prevent wind and rain from entering the building from the outside through the gaps formed by the seismic isolation slits 46.

[0026] Furthermore, since the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40, including the outer perimeter wall 45a, is formed in a state where it is divided vertically via a seismic isolation slit 46, during an earthquake, when the floor slab 42 of the upper floor 22 moves laterally relative to the ceiling slab 41 of the lower floor 21 due to the action of the seismic isolation device 47 of the seismic isolation operating unit 43 in the intermediate floor seismic isolation layer 40, it is possible to avoid such lateral movement being hindered by the intermediate floor concrete wall 45 interposed between them, thereby allowing for smooth lateral movement.

[0027] In this embodiment, as described above, the second floor 22 of the reinforced concrete lower floor 20 is preferably the top floor of the lower floor 20, and the intermediate floor seismic isolation layer 40 is interposed between the second floor 22, which is the top floor of the lower floor 20, and the first floor 21, which is preferably the bottom floor. By arranging the intermediate floor seismic isolation layer 40, which exhibits seismic isolation function, between the top floor 22 of the lower floor 20 and the lower floor 21 directly below it, the intermediate floor seismic isolation layer 40 is provided as high as possible on the reinforced concrete lower floor 20, so that it is possible to effectively suppress the acceleration that occurs on the upper floor 30, which is a wooden hybrid structure above the lower floor 20, during an earthquake. Furthermore, the ceiling slab 23 of the second floor 22, which is the top floor of the lower floor 20, which is a reinforced concrete structure, also serves as the floor slab of the third floor 31a, which is the bottom floor of the upper floor 30. Since the entire structure, including the ceiling slab 23, is made of reinforced concrete, it is possible to ensure sufficient superimposed load on the seismic isolation devices 47 of the multiple seismic isolation operating parts 43 that constitute the intermediate floor seismic isolation layer 40 by the weight of the concrete, which has a large unit weight.

[0028] In other words, in this embodiment, the upper floors 30 from the 3rd to the 8th floor, which are continuous above the lower floor 20 made of reinforced concrete, are a wood-reinforced concrete hybrid structure, preferably a wood-reinforced concrete hybrid structure that combines wood and reinforced concrete, mainly using wood materials with a small unit weight. For this reason, it is desirable to suppress the acceleration generated in the upper floors 30 made of the wood-reinforced concrete hybrid structure as much as possible during an earthquake. However, since the overall weight of the upper floors 30 made of the wood-reinforced concrete hybrid structure is lighter than that of the reinforced concrete structure, it is conceivable that during an earthquake, it may not be possible to secure a sufficient superimposed load to properly function the seismic isolation devices 47 of the multiple seismic isolation operating parts 43 of the intermediate floor seismic isolation layer 40 located at the very top. In this embodiment, by making the entire second floor 22, including the ceiling slab 23 portion of the second floor 22 which is also the floor slab of the third floor 31a, the lowest floor of the upper floor 30, a reinforced concrete structure with considerable weight, the natural period of the floor above the intermediate floor seismic isolation layer 40 becomes longer, and while suppressing the acceleration that occurs in the upper floor 30, it is possible to secure a sufficient superimposed load on the seismic isolation device 47 of the seismic isolation operating unit 43.

[0029] In this embodiment, the second floor 22, which is the top floor of the lower floor 20 of the reinforced concrete structure, is formed as a living space with multiple private rooms, as described above. As shown in Figure 5, the second floor 22 has a roughly L-shaped plan, consisting of a western main floor section 22a having a wider plan in the north-south direction, obtained by cutting out, for example, a quarter of the northeast horizontally elongated rectangular plan in the east-west direction, and an overhanging floor section 22b having a narrower width in the north-south direction, which extends eastward from approximately the southern half of the main floor section 22a.

[0030] On the second floor 22 of the reinforced concrete structure, a corridor 22c is provided that traverses the central north-south part of the main floor 22a and extends further east-west along the northern edge of the cantilevered floor 22a. To the south of the corridor 22c, for example, 10 private rooms 25 are provided, separated by a reinforced concrete partition wall 22d, and are connected in an east-west direction from the main floor 22a to the cantilevered floor 22b, with access from the corridor 22c. To the north of the corridor 22c on the main floor 22a, for example, 2 private rooms 25 are provided in the western part, separated by a partition wall 22e made of gypsum board or the like, with access from the corridor 22c. Adjacent to the east of these, a concrete core section 50 with a rectangular cross-section of reinforced concrete structure is provided, where the elevator shaft 35, described later, is located (see Figure 6). Adjacent to the east of the concrete core section 50, a reinforced concrete stairwell 55 is provided. The concrete core section 50 and the elevator shaft 35 are constructed to be erected continuously upward from the second floor 22 to the eighth floor 31f, which is the top floor of the upper floor 30, as will be described later (see Figure 3).

[0031] Furthermore, in this embodiment, the floors from the 3rd floor 31a to the 8th floor 31f in the upper floor 30, which is connected to the 2nd floor 22, the top floor of the lower floor 20 of the reinforced concrete structure, are formed as living spaces with multiple private rooms 25, as described above, and have substantially the same floor plan. The floors from the 3rd floor 31a to the 8th floor 31f are a hybrid floor section consisting of multiple floors of a wooden hybrid structure. For example, as shown in Figure 6, the 4th floor 31b has a plan shape that adds one private room 25 on the base end side (west side) in the cantilever direction of the cantilevered floor section 22b to the main floor section 22a of the 2nd floor 22 of the reinforced concrete structure.

[0032] On the 4th floor 31b, which is a wooden hybrid structure, a corridor 32a is provided that crosses the central part in the north-south direction. On the south side of the corridor 32a, for example, six private rooms 33 are provided, connected in the east-west direction and accessible from the corridor 32a, preferably separated by wooden partition walls 32b and partition walls made of gypsum board or the like. On the north side of the corridor 32a, for example, two private rooms 33 are provided in the western part, preferably separated by wooden bracing and partition walls made of gypsum board or the like, and accessible from the corridor 32a. Adjacent to the east of these, similar to the 2nd floor 22, a concrete core section 50 with a rectangular cross-section of reinforced concrete structure is provided, where the elevator shaft 35, which will be described later, is located. Further east of the concrete core section 50, a stairwell 55 of reinforced concrete structure is provided.

[0033] Furthermore, in this embodiment, the upper floors 30, which are formed continuously above the lower floor 20 of the reinforced concrete structure, for example from the 3rd floor 31a to the 8th floor 31f, are preferably a wood-reinforced concrete hybrid structure, combining wood and reinforced concrete (RC) construction, as described above. The upper floors 30 of the wood-reinforced concrete hybrid structure, as shown in Figures 3, 5, and 6, preferably rise from the floor slab 42 of the 2nd floor 22, which is the top floor of the lower floor 20 of the reinforced concrete structure, and are formed continuously in the vertical direction so as to penetrate the upper floors 30 of the wood-reinforced concrete hybrid structure, and include a concrete core portion 50 of a reinforced concrete structure with a rectangular cross-sectional shape. In the upper floor 30, which is a wooden hybrid structure, the ceiling slab 51 and floor slab 52 of each floor 31a to 31f are formed as a single unit so as to protrude outward from the concrete core 50, and each of the multiple wooden columns 53 is installed vertically between the ceiling slab 51 and floor slab 52 of the upper floors 31b to 31f and the lower floors 31a to 31e, with the wooden columns 53 of the upper floors 31b to 31f being separated at the portion of the floor slab 52 of the upper floors 31b to 31f which is also the ceiling slab 51 of the lower floors 31a to 31f.

[0034] This makes it possible to transmit horizontal stress to the concrete core 50 via the reinforced concrete ceiling slab 51 and floor slab 52, so that the concrete core 50 bears the horizontal stress.

[0035] Furthermore, in this embodiment, in the upper floor 30 which is a wooden hybrid structure, preferably wooden beams 54a are integrally joined to the ceiling slab 51 and floor slab 52, or concrete beams 54b are integrally formed, and each of the multiple wooden columns 53 is erected and installed between the ceiling slab 51 and floor slab 52 with these wooden beams 54a or concrete beams 54b interposed between them.

[0036] The joints at the top and bottom ends of the wooden column 53 are pin-jointed, which makes it possible to create a structure that transmits only vertical loads from the upper floors, while preventing the transmission of horizontal stresses during earthquakes and other events.

[0037] Furthermore, in this embodiment, in the upper floor 30 which is a wooden hybrid structure, a wooden seismic wall 56 is erected and installed, preferably in the portion between the ceiling slab 51 and the floor slab 52, or with a wooden beam 54a or concrete beam 54b interposed between them.

[0038] This means that a member is provided to bear horizontal stress separately from the concrete core 50, making it possible to reduce the eccentricity (difference between the center of gravity and the center of rigidity) of each floor.

[0039] Furthermore, as described above, in the seismically isolated high-rise building 10 of this embodiment, as shown in Figure 3, a reinforced concrete elevator shaft 35 is provided extending downward to a height reaching the floor slab 21a of the 1st floor 21, which is the lowest floor of the lower floor 20, while being supported at least by the floor slab 42 of the upper floor 22 that forms the intermediate seismic isolation layer 40. In this embodiment, the elevator shaft 35 is preferably supported by the floor slab 42 of the upper floor 22 that forms the intermediate seismic isolation layer 40, and is also positioned inside a concrete core section 50 that is continuously erected upward from the floor slab 42 of the upper floor 22 to the 8th floor 31f, which is the top floor of the upper floor 30. It is then integrally joined to a plurality of floor support slabs 57 that are formed to project inward from the concrete core section 50 on each floor 31a to 31f of the upper floor 30, thereby also being supported by the concrete core section 50. Furthermore, the elevator shaft 35 is positioned to be inserted into the insertion openings 41b, 21b, while maintaining a predetermined distance 41c, 21c between the opening edge of the insertion opening 41b formed in the ceiling slab 41 of the first floor, which is the lower floor and forms the intermediate floor seismic isolation layer 40, and the opening edge of the insertion opening 21b formed in the floor slab 21a of the first floor, which is at least the lower floor, below the insertion opening 41b.

[0040] Furthermore, in this embodiment, as described above, the planar area of ​​the upper floor 30, which is preferably a wooden hybrid structure, is smaller than the planar area of ​​the lower floor 20, which is a reinforced concrete structure, and the upper floor 30 is provided in a state where it is positioned, for example, to the west, as a predetermined direction within the planar area of ​​the lower floor 20.

[0041] Furthermore, in the reinforced concrete and wooden seismically isolated high-rise building 10 of this embodiment having the above-described configuration, an intermediate floor seismic isolation layer 40 is provided interposed between the lower floor 21 and the upper floor 22 in the lower floor 20, which is a reinforced concrete structure, and seismic isolation operating parts 43 are provided in multiple locations distributed within the intermediate floor seismic isolation layer 40. Each seismic isolation operating part 43 is composed of a lower concrete base part 41a, an upper concrete base part 42a, and a seismic isolation device 47 sandwiched between them, and the intermediate floor concrete wall 45 of the intermediate floor seismic isolation layer 40, which is erected between the ceiling slab 41 of the lower floor 21 and the floor slab 42 of the upper floor 22, is formed in a state where it is divided vertically by a seismic isolation slit 46.

[0042] As a result, according to the reinforced concrete and wooden seismically isolated high-rise building 10 of this embodiment, the horizontal load applied during an earthquake is effectively absorbed by moving the reinforced concrete upper floor 22 relative to the reinforced concrete lower floor 21 via the intermediate seismic isolation layer 40 provided between the lower floor 21 and the upper floor 22 of the reinforced concrete lower floor, thereby enabling the building to continue to be supported in a stable state. Furthermore, the intermediate seismic isolation layer 40 provided in the middle part of the reinforced concrete lower floor makes it possible to efficiently provide seismic isolation without requiring an underground pit for foundation seismic isolation. In addition, since the intermediate seismic isolation layer 40 can be provided so as to fit within the same planar area as the floors 21 and 22 of the lower floor 20 without protruding outward, it becomes possible to efficiently design the building within the limited site on which the building is constructed without being constrained by extra occupied area due to the seismic isolation layer.

[0043] Therefore, according to the reinforced concrete and wooden seismically isolated high-rise building 10 of this embodiment, even in high-rise buildings of six stories or more, including wooden hybrid structures, it is possible to efficiently and effectively provide seismic isolation functionality without relying on base isolation, so that the building can continue to be supported in a stable state during an earthquake. Furthermore, as described above, it is possible to ensure sufficient superimposed load while suppressing the acceleration that occurs in the upper floors 30 of the wooden hybrid structure during an earthquake, thereby allowing the seismic isolation function of the intermediate floor seismic isolation layer 40 to be properly exercised during an earthquake.

[0044] It should be noted that the present invention is not limited to the embodiments described above and can be modified in various ways. For example, the lower floor of the reinforced concrete structure does not necessarily have to be a two-story structure consisting of a first floor and a second floor; it may be a lower floor of three or more stories. In this case, the intermediate seismic isolation layer can be provided between the second floor, third floor, etc., and the upper floor, such as the third or fourth floor, which is the top floor. The upper floor of the wooden hybrid structure does not necessarily have to be positioned off-center in a predetermined direction within the planar area of ​​the lower floor 20 of the reinforced concrete structure; the upper floor can also be positioned with the centroids of these planar areas aligned. [Explanation of Symbols]

[0045] 10. Seismic isolation high-rise buildings 20 lower level 21 Lower floor (1st floor) 21a Floor slab of floor 21 on the first floor 21b Through opening 21c spacing 22 Top floor (2nd floor) 22a Main floor area 22b Overhanging floor section 22c Corridor 22d, 22e Partition wall 23. Ceiling slab of the top floor 25 private rooms 30 Upper layer 31a 3rd floor 31b 4th floor 32a Corridor 32b Partition wall 33 private rooms 35 Elevator shaft 40 Intermediate floor seismic isolation layer 41. Ceiling slab of the lower floor 41a Lower concrete base 41b Through opening 41c spacing 42 Floor slab of the upper floor 42a Upper concrete base 43 Seismic isolation mechanism 44 Ceiling beams 45 Intermediate floor concrete wall 45a outer wall 46 Seismic isolation slits 46a Gap filler 46b Trim 47 Seismic isolation device 48 Floor beam 49 Damper device 50 Concrete core section 51 Ceiling slab 52 Floor slab 53 Wooden pillar 54a wooden beam 54b Concrete beam 55 Staircase 56. Wooden seismic walls 57 Support slab

Claims

1. A reinforced concrete and wooden high-rise building with seismic isolation, comprising a lower floor consisting of multiple floors made of reinforced concrete and an upper floor consisting of multiple floors made of a wooden hybrid structure, In the aforementioned lower floor, which is a reinforced concrete structure, an intermediate seismic isolation layer is provided between the top floor and the lower floor. The intermediate floor seismic isolation layer is interposed between the floor slab of the top floor and the ceiling slab of the lower floor, and has seismic isolation operating parts that are distributed at multiple locations. Each of the aforementioned seismic isolation operating units is composed of an upper concrete base portion that protrudes downward as a whole from the floor slab of the top floor, a lower concrete base portion that protrudes upward as a whole from the ceiling slab of the lower floor, and a seismic isolation device that is mounted so as to be sandwiched between these concrete base portions. Furthermore, the intermediate floor concrete wall of the intermediate floor seismic isolation layer, including the outer perimeter wall, which is erected between the floor slab of the top floor and the ceiling slab of the lower floor, is formed in a state where it is divided vertically by seismic isolation slits. The aforementioned top floor, including the ceiling slab portion which also serves as the floor slab of the lowest floor of the upper level, is a reinforced concrete structure, thereby ensuring that the superimposed loads on the aforementioned seismic isolation devices at multiple locations are secured in this reinforced concrete and wooden high-rise seismically isolated building.

2. The reinforced concrete and wooden high-rise seismically isolated building according to claim 1, wherein the second floor of the lower level is designated as the top floor, the first floor as the lower level, and the intermediate seismic isolation layer is interposed between them, and the ceiling slab of the top floor, which also serves as the floor slab of the lowest floor of the upper level, is the ceiling slab of the second floor, which also serves as the floor slab of the third floor.

3. A reinforced concrete and wooden high-rise seismically isolated building according to claim 1 or 2, wherein a reinforced concrete elevator shaft is provided extending downward to a height reaching the floor slab of the lowest floor of the lower floor, with the elevator shaft being supported by the floor slab of the top floor that forms at least the intermediate seismic isolation layer, and the elevator shaft is positioned to be inserted into the openings formed in the ceiling slab of the lower floor that forms the intermediate seismic isolation layer, while maintaining a predetermined distance between these openings and the opening edges of the insertion openings formed in at least the floor slab of the lower floor below.

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