Reinforced concrete and wooden earthquake-resistant high-rise buildings

Abstract

The present invention provides a reinforced concrete and wooden high-rise building with seismic isolation capabilities, which also allows for the stable support of the elevator shaft while avoiding interference with the lower floors. [Solution] A seismically isolated high-rise building 10 includes a lower floor 20 made of reinforced concrete and an upper floor 30 made of wood hybrid structure, wherein an intermediate seismic isolation layer 40 is provided between the lower floor 21 and the upper floor 22 of the lower floor 20. An elevator shaft 35 is supported by the upper floor 30 and extends to a height reaching the floor slab 21a of the lowest floor of the lower floor 20, and is supported inside the concrete core section 50. The elevator shaft 35 is inserted between the ceiling slab 41 and the floor slab 21a of the lower floor 21, maintaining a spacing of 41c, 21c between them and the opening edges of the insertion openings formed in the ceiling slab 41 and floor slab 21a.

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 wooden hybrid structure.

Background Art

[0002] Preferably, as part of recent efforts towards ESG / SDGs, for example, it is recommended to construct medium-rise to high-rise buildings 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. Additionally, they can absorb carbon dioxide and fix carbon, thus attracting attention from the perspective of decarbonization.

[0003] Also, when constructing medium-rise to high-rise buildings using wood materials, it is considered that the strength is likely to be insufficient. Therefore, with the aim 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 (see, for example, Patent Document 1), and wooden / RC (reinforced concrete) mixed-structure buildings constructed by combining wood construction and RC construction (see, for example, Patent Documents 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 [Patent Document 3] Japanese Patent Application Publication No. 11-350782 [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, when an intermediate seismic isolation layer is installed between the lower and upper floors, it is necessary to ensure that the reinforced concrete elevator shaft, which penetrates the upper floor vertically to reach the lower floor, does not interfere with each floor of the lower floor when it moves laterally relative to the lower floor along with the upper floor during an earthquake, and technology for this purpose has also been disclosed (see, for example, Patent Document 3).

[0010] On the other hand, in the multi-story seismic isolation building disclosed in Patent Document 3, since both the upper and lower floors of the seismic isolation building are made of reinforced concrete, it is possible to firmly and stably support the elevator shaft as a whole in the reinforced concrete structure of the upper floor. However, if the upper floor is made of a wooden hybrid structure, it is thought that the elevator shaft will not be able to be supported in a stable state, so it is necessary to ensure that the reinforced concrete elevator shaft is supported in a stable state.

[0011] The present invention aims to provide a reinforced concrete and wooden high-rise building with seismic isolation that can efficiently and effectively provide seismic isolation functionality to high-rise buildings, such as those with six or more stories, including wooden hybrid structures, so that the building can continue to be supported in a stable state during an earthquake. Furthermore, it eliminates the need for underground pits for installing base isolation, allowing the building to be designed without being restricted by the occupied area of ​​underground pits, and also provides a reinforced concrete elevator shaft that can be supported in a stable state while avoiding interference with the lower floors. [Means for solving the problem]

[0012] The present invention relates to a reinforced concrete and wooden high-rise building with seismic isolation, comprising a lower floor consisting of multiple floors of reinforced concrete structure and an upper floor consisting of multiple floors of wooden hybrid structure, wherein an intermediate seismic isolation layer is provided between the lower and upper floors of the reinforced concrete lower floor, and the intermediate concrete wall of the intermediate seismic isolation layer, including the outer wall connecting the ceiling slab of the lower floor and the floor slab of the upper floor, is formed in a state where it is divided vertically by seismic isolation slits, and a reinforced concrete elevator shaft is provided, supported by the upper floor, to extend downward to a height reaching the floor slab of the lowest floor of the lower floor, penetrating vertically through the wooden hybrid structure upper floor. The elevator shaft is positioned inside a concrete core that is continuously erected upward from the floor slab of the upper floor to the top floor of the upper structure, and is supported by the concrete core by being integrally joined to support slabs of multiple floors that are formed to project inward from the concrete core on each floor of the upper structure, and the elevator shaft is inserted into the openings formed in the ceiling slab of the lower floor that forms the intermediate floor seismic isolation layer, and the openings formed in at least the floor slab of the lower floor below, while maintaining a predetermined distance from these openings, thereby providing a reinforced concrete and wooden high-rise building.

[0013] Furthermore, in the reinforced concrete and wooden high-rise buildings with seismic isolation according to the present invention, it is preferable that the first floor of the lower level is designated as the lowest floor, the second floor as the upper floor, and the intermediate floor seismic isolation layer is interposed between them.

[0014] Furthermore, in the reinforced concrete and wooden high-rise buildings with seismic isolation according to the present invention, it is preferable that the elevator shaft, which is supported by the upper floors and extends to a height reaching the floor slab of the first floor, is inserted into the through-openings formed in the ceiling slab of the first floor that forms the intermediate floor seismic isolation layer, while maintaining a predetermined distance between the opening edge of the through-opening formed in at least the floor slab of the first floor below, and the opening edge of the through-opening formed in at least the floor slab of the first floor below.

[0015] Furthermore, in the reinforced concrete and wooden high-rise buildings with seismic isolation according to the present invention, the intermediate floor seismic isolation layer has seismic isolation operating parts interposed between the ceiling slab of the lower floor and the floor slab of the upper floor, and is preferably configured to include a lower concrete base portion that protrudes upward as a whole from the ceiling slab of the lower floor, an upper concrete base portion that protrudes downward as a whole from the floor slab of the upper floor, and a seismic isolation device that is attached so as to be sandwiched between these concrete base portions. [Effects of the Invention]

[0016] According to the seismically isolated high-rise building made of reinforced concrete and wood of the present invention, even in high-rise buildings of six stories or more, including wooden hybrid structures, seismic isolation functions can be efficiently and effectively provided so that the building can continue to be supported in a stable state during an earthquake. Furthermore, it eliminates the need for underground pits to install base isolation, allowing the building to be designed without being restricted by the occupied area of ​​underground pits, and it also allows the reinforced concrete elevator shaft to be supported in a stable state while avoiding interference with the lower floors. [Brief explanation of the drawing]

[0017] [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 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 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 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 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 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 a seismic isolation slit provided in the intermediate floor concrete wall.

Embodiments for Carrying out the Invention

[0018] A preferred embodiment of the present invention, a reinforced concrete and wooden seismically isolated high-rise building 10, as shown in Figure 1, is preferably a high-rise building of six stories or more, for example, an eight-story building, and is equipped with a seismic isolation function so that it can maintain a stable state 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 structure and an upper floor 30 consisting of, for example, six floors made of wooden hybrid structure. In this embodiment, the seismically isolated high-rise building 10, being a reinforced concrete and wooden building, is equipped with a seismic isolation function without employing base isolation, so that the building can be efficiently designed on a limited site without being constrained by the occupied area of ​​an underground pit for installing base isolation, and the seismic isolation function can be exerted in a more stable state. Furthermore, the seismically isolated high-rise building 10 of this embodiment is able to stably support the reinforced concrete elevator shaft 35 while avoiding interference with the lower floor 21.

[0019] Furthermore, the reinforced concrete and wooden seismically isolated high-rise building 10 of this embodiment, as shown in Figure 1, is a high-rise building, for example, with 8 floors, comprising a lower floor 20 consisting of multiple floors (preferably 2 floors in this embodiment) made of a reinforced concrete structure and an upper floor 30 consisting of multiple floors (preferably 6 floors in this embodiment) made of a wooden hybrid structure. As also shown in Figures 2 and 3, an intermediate floor seismic isolation layer 40 is provided interposed between the lower floor (preferably the 1st floor in this embodiment) 21 and the upper floor (preferably the 2nd floor in this embodiment) 22 of the reinforced concrete lower floor 20. Preferably, the intermediate floor seismic isolation layer 40 is provided with seismic isolation operating parts 43 distributed at multiple locations, which support the ceiling slab 41 of the lower floor 21 to the floor slab 42 of the upper floor 22 so that they can move relative to each other in the lateral direction (see Figure 4). Each seismic isolation operating section 43 preferably includes a lower concrete base section 41a that protrudes upward as a whole from the ceiling slab 41 of the lower floor 21, an upper concrete base section 42a that protrudes downward as a whole from the floor slab 42 of the upper floor 22, and a seismic isolation device 47 that is mounted sandwiched between these concrete base sections 41a and 42a. 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 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 (see Figures 2 and 7).

[0020] Furthermore, in the seismically isolated high-rise building 10 of this embodiment, as shown in Figure 3, a reinforced concrete elevator shaft 35 is installed so as to penetrate vertically through the upper floor 30, which is a wooden hybrid structure, and is supported by the floor slab 42 of the upper floor 22 that forms at least the intermediate floor seismic isolation layer 40, and extends downward to a height reaching the floor slab 21a of the 1st floor 21, which is the lowest floor of the lower floor 20. The elevator shaft 35 is positioned inside a concrete core section 50 (see Figures 5 and 6) that is continuously erected upward from the floor slab 42 of the upper floor 22 to the top floor of the upper floor 30, and is supported by the concrete core section 50 by being integrally joined to multiple floor support slabs 57 that are formed to project inward from the concrete core section 50 on each floor of the upper floor 30. 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 21, which is the lower floor forming 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 21, which is at least the lower floor below, and these insertion openings 41b, 21b.

[0021] 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.

[0022] 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 the first floor 21 without protruding outward from it. Preferably, 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.

[0023] 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).

[0024] 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).

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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, and to allow for smooth lateral movement.

[0029] 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, which is the top floor of the lower floor 20, and the first floor 21, which is preferably the bottom floor. Furthermore, the second floor 22, which is the top floor of the reinforced concrete lower floor 20, is entirely made of reinforced concrete, including the portion of the ceiling slab 23 that also serves as the floor slab of the third floor 31, which is the bottom floor of the upper floor 30. As a result, in this embodiment, the weight of the concrete in the intermediate floor seismic isolation layer 40, which has a large unit weight, ensures sufficient superimposed load on the seismic isolation devices 47 of the multiple seismic isolation operating parts 43, thereby lengthening the natural period above the intermediate floor seismic isolation layer 40 and ensuring the effectiveness of the seismic isolation structure.

[0030] 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 hybrid structure, preferably a wood-RC structure that combines wood and RC (reinforced concrete), mainly using wood materials with a small unit weight. As a result, the overall weight of the upper floors 30 is lighter compared to an RC structure, which may mean that in the event of 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. In this embodiment, the entire 2nd floor 22, including the ceiling slab 23 and ceiling beams of the 2nd floor 22, which is also the floor slab of the 3rd floor 31a, the lowest floor of the upper floors 30, is made of reinforced concrete with considerable weight, thereby ensuring a sufficient superimposed load on the seismic isolation devices 47 of the seismic isolation operating parts 43.

[0031] 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.

[0032] 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 22b. 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 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).

[0033] 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.

[0034] Furthermore, on the fourth floor 31b of the wooden hybrid structure, for example, a corridor 32a is provided that crosses the central part in the north-south direction. On the south side of the corridor 32a, preferably separated by a wooden partition wall 32b and a partition wall made of gypsum board or the like, for example, six private rooms 33 are provided, connected in the east-west direction and accessible from the corridor 32a. On the north side of the corridor 32a, preferably separated by wooden bracing and a partition wall made of gypsum board or the like, for example, two private rooms 33 are provided in the western part, accessible from the corridor 32a. Adjacent to the east of these, similar to the second floor 22, a concrete core section 50 with a rectangular cross-section of reinforced concrete structure is provided, where an elevator shaft 35 is located. Further east of the concrete core section 50, a stairwell 55 of reinforced concrete structure is provided.

[0035] 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.

[0036] 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.

[0037] 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. 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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. The elevator shaft 35 is 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 multiple 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, and is also supported by the concrete core section 50.

[0042] 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 21, which is the lower floor forming 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 21, which is at least the lower floor below, and these insertion openings 41b, 21b. In this way, the elevator shaft 35 is inserted between the opening edge of the insertion opening 41b formed in the ceiling slab 41 of the first floor 21 and the opening edge of the insertion opening 21b formed in the floor slab 21a of the lower floor 21, maintaining a predetermined gap 41c, 21c. Therefore, when the elevator shaft 35, which is integrated with the upper floor 30, moves laterally relative to the first floor 21 during an earthquake, the maintained gap 41c, 21c makes it possible to effectively avoid interference with the first floor 21. By providing, for example, a known movable floor, similar to the seismic isolation building described in Japanese Patent Publication No. 11-350782, so as to cover a predetermined gap 41c, 21c between the opening edge of the insertion opening 41b formed in the ceiling slab 41 or floor slab 21a of the first floor 21 and the elevator shaft 35, it becomes possible, for example, to walk on the movable floor and enter and exit the elevator gauge (not shown) inside the elevator shaft 35 during normal times.

[0043] In this embodiment, preferably, the planar area of ​​the upper floor 30, which is made of a wooden hybrid structure, is smaller than the planar area of ​​the lower floor 20, which is made of reinforced concrete, and the upper floor 30 is set back in a predetermined direction within the planar area of ​​the lower floor 20, for example, by being positioned to the west.

[0044] Furthermore, according to the reinforced concrete and wooden seismically isolated high-rise building 10 of this embodiment, which has the above-described configuration, it becomes possible to efficiently and effectively provide seismic isolation functionality to high-rise buildings, such as those with six or more stories, including wooden hybrid structures, so that the building can continue to be supported in a stable state during an earthquake. In addition, it becomes possible to design the building without being restricted by the occupied area due to the underground pit, by eliminating the need for an underground pit to install base isolation.

[0045] In other words, according to the seismically isolated high-rise building 10 of this embodiment, an intermediate 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. Preferably, seismic isolation operating parts 43 are provided in the intermediate seismic isolation layer 40, distributed at multiple locations. Each seismic isolation operating part 43 is composed of, for example, a lower concrete base part 41a, an upper concrete base part 42a, and a seismic isolation device 47 sandwiched between them. Furthermore, the intermediate concrete wall 45 of the intermediate 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.

[0046] 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 through an intermediate seismic isolation layer 40 provided between the lower floor 21 and the upper floor 22 of the reinforced concrete lower floor 20, 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 first floor 21 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.

[0047] Furthermore, in the reinforced concrete and wooden seismically isolated high-rise building 10 of this embodiment, the reinforced concrete elevator shaft 35 is provided so as to penetrate vertically through the upper floor 30 which is a wooden hybrid structure, and is supported at least by the floor slab 42 of the upper floor 22 which forms the intermediate seismic isolation layer 40, and extends downward to a height reaching the floor slab 21a of the 1st floor 21 which is the lowest floor of the lower floor 20. At this time, the elevator shaft 35 is supported by the floor slab 42 of the upper floor 22 which forms the intermediate seismic isolation layer 40, and is also positioned inside the concrete core section 50 which is erected continuously 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, and is integrally joined to the support slabs 57 of multiple floors which 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 21, which is the lower floor forming 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 21, which is at least the lower floor below, and these insertion openings 41b, 21b. In this embodiment, it is possible to stably support the reinforced concrete elevator shaft from the upper floor 30, which is a wooden hybrid structure, while avoiding interference with the lower floor, the first floor 21.

[0048] Furthermore, in this embodiment, the seismically isolated high-rise building 10 has a concrete core section 50 and elevator shaft 35 made of reinforced concrete structure that are continuously provided from the upper floor 30 to the upper floor 22 of the lower floor 20, and an intermediate floor seismic isolation layer 40 is interposed between the lower floor 21 and the upper floor 22 of the lower floor 20, which are made of reinforced concrete structure. As a result, the seismic isolation device 47 of the seismic isolation operating section 43 that constitutes the intermediate floor seismic isolation layer 40 can be subjected to the necessary superimposed load weight by the concrete core section 50 and elevator shaft 35, so that the seismic isolation operating section 43 of the intermediate floor seismic isolation layer 40 can be made to operate effectively, thereby achieving a higher seismic isolation function.

[0049] 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 a reinforced concrete structure does not necessarily have to be a two-story structure consisting of a first floor and a second floor, but may be a three-story or more lower floor. In this case, the intermediate floor seismic isolation layer does not necessarily have to be provided between the top floor of the lower floor and the lower floor below it, but can be provided between any upper and lower floor in a multi-story structure of three or more stories, for example, between the second floor and the third floor, or between the first floor and the second floor. The intermediate floor seismic isolation layer does not necessarily have to consist of multiple seismic isolation operating parts comprising a lower concrete base, an upper concrete base, and a seismic isolation device sandwiched between them, but may consist of seismic isolation operating parts of various other structures. [Explanation of Symbols]

[0050] 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 Upper floor (2nd floor) 22a Main floor area 22b Overhanging floor section 22c Corridor 22d, 22e Partition wall 23 Ceiling slab 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

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 made of reinforced concrete, an intermediate seismic isolation layer is provided between the lower floor and the upper floor. The intermediate floor concrete wall of the intermediate floor seismic isolation layer, including the outer perimeter wall, which connects the ceiling slab of the lower floor and the floor slab of the upper floor, is formed in a state where it is divided vertically by seismic isolation slits. Furthermore, a reinforced concrete elevator shaft is installed, supported by the upper floor, so as to penetrate vertically through the upper floor which is a wooden hybrid structure, and extends downward to a height that reaches the floor slab of the lowest floor of the lower floor. The elevator shaft is positioned inside a concrete core that is continuously erected upward from the floor slab of the upper floor to the top floor of the upper level, and is supported by the concrete core by being integrally joined to multiple support slabs formed to project inward from the concrete core on each floor of the upper level. The elevator shaft is inserted into the through-openings formed in the ceiling slab of the lower floor forming the intermediate floor seismic isolation layer, and the opening edges of the through-openings formed in at least the floor slab of the lower floor below, while maintaining a predetermined distance between these openings and the elevator shaft, a reinforced concrete and wooden seismic isolation high-rise building.

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

3. The reinforced concrete and wooden seismically isolated high-rise building according to claim 2, wherein the elevator shaft, supported by the upper floor, extends to a height reaching the floor slab of the first floor, and is inserted into the through-openings formed in the ceiling slab of the first floor that forms the intermediate floor seismic isolation layer, while maintaining a predetermined distance between these through-openings and the opening edges of the through-openings formed in at least the floor slab of the first floor below.

4. The intermediate floor seismic isolation layer is interposed between the ceiling slab of the lower floor and the floor slab of the upper floor and has seismic isolation operating parts distributed at multiple locations, each of which includes a lower concrete base portion that protrudes upward as a whole from the ceiling slab of the lower floor, an upper concrete base portion that protrudes downward as a whole from the floor slab of the upper floor, and a seismic isolation device that is attached so as to be sandwiched between these concrete base portions, as described in any one of claims 1 to 3.

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