JP6171566B2 - Extension method - Google Patents

Description

  The present invention relates to a method for extending a building having a base isolation structure adjacent to an existing building having a base isolation structure.

  Buildings with an upper structure built on seismic isolation devices installed in seismic isolation pits formed by excavating the ground as seismic isolation structures, or seismic isolation devices installed in the middle of pillars on intermediate floors The building is known. In addition, as a method of extending the seismic isolation building adjacent to the existing seismic isolation building, first, the extension seismic isolation building is constructed independently from the existing seismic isolation building, and then the foundation and extension of the existing seismic isolation building are built. By connecting the base of the base-isolated building (connecting the lower ends of the upper structure to each other) and constructing the upper structure at the connecting part, the existing base-isolated building and the extension base-isolated building are completely integrated A method has been proposed. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 10-292643

  In a building with a base isolation structure, the rigid center of the base isolation layer and the center of gravity of the superstructure do not coincide (eccentricity), which causes torsional vibration and reduces earthquake resistance. Therefore, the seismic isolation layer is designed on the assumption that the extension will be completed. Patent Document 1 describes that if a seismic isolation building is extended by the above-described procedure, it can be constructed while making the seismic isolation layer rigid center and the center of gravity of the upper structure coincide with each other even during the extension. However, in the extension method of Patent Document 1, when the weight difference between the upper structure of the existing base isolation building and the upper structure of the extension base isolation building is large and the weight of the upper structure constructed between the two buildings is large In addition, the center of gravity at the time when the foundations of the two buildings are connected is shifted to the building side where the weight of the upper structure is larger than the center of gravity when the extension is completed. In other words, since the stiffness of the seismic isolation layer and the center of gravity of the upper structure are shifted during the extension, there is a risk that the building will be twisted and vibrated if an earthquake occurs during the extension.

  This invention is made | formed in view of this conventional subject, and it aims at providing the extension method which improves the earthquake resistance in the extension of the building of the seismic isolation structure adjacent to the existing building of a seismic isolation structure.

The extension method for achieving the object is to add the second upper part so as to be adjacent to the existing building with the first seismic isolation layer interposed between the first upper structure and the first lower structure. An extension building in which a second seismic isolation layer is interposed between the structure and the second lower structure, wherein the weight of the second upper structure is different from the weight of the first upper structure. Building process;
The upper ends of the first upper structure and the second upper structure are connected by a rigid member, and the lower ends of the first upper structure and the second upper structure are connected by a rigid member , The floor between the upper end side connected by the rigid member and the lower end side connected by the rigid member is not connected by the rigid member ;
Have
It is an extension method characterized in that it is used as it is without breaking the outer wall of the existing building .

  According to such an extension method, since the extension building is constructed separately from the existing building, the existing building is not affected by the extension and the seismic isolation function works on the existing building during the extension as before. In addition, the existing building where the center of gravity of the base isolation layer and the center of gravity of the upper structure coincide with the extension of the center of gravity of the base isolation layer and the center of gravity of the upper structure independently of the existing building. When the buildings are partially connected, the rigidity of the seismic isolation layer in the integrated building and the center of gravity of the upper structure coincide with each other, so that the generation of torsional vibration during extension can be suppressed. Therefore, the earthquake resistance during the extension can be improved.

In this extension method, at least one of the rigid member on the upper end side and the rigid member on the lower end side is provided on a horizontal plane.
According to such an extension method, the horizontal seismic force can be efficiently transmitted from one of the first upper structure and the second upper structure to the other, and an extra force is applied to the rigid member. The first upper structure and the second upper structure can be vibrated together without any problem.

In this extension method, at least one of the rigid member on the upper end side and the rigid member on the lower end side is coupled to the upper structure so as to be rotatable on a horizontal plane. It is an extension method.
According to such an extension method, even when the vibration directions of the first upper structure and the second upper structure are different and intersect, the relative displacement in the direction in which the first upper structure and the second upper structure intersect. Therefore, it is possible to suppress the twisting of the building.

This extension method is an extension method characterized in that the seismic isolation period of the extension building is set to the same period as the seismic isolation period of the existing building.
According to such an extension method, the first upper structure and the second upper structure can be vibrated integrally without applying an extra force to the rigid member.

In this extension method, the second seismic isolation layer is provided at the same level as the first seismic isolation layer.
According to such an extension method, it becomes easy to provide the rigid member on the horizontal plane, and it becomes easy to set the seismic isolation period of the extension building to the same period as that of the existing building.

In this extension method, the strong axis of the extension building intersects the strong axis of the existing building.
According to such an extension method, the displacement of one of the upper structures is reduced with respect to the seismic force along the weak axis direction of one of the first upper structure and the second upper structure. It can be suppressed by the superstructure of the structure, and the earthquake resistance can be improved.

In this extension method, a daylighting ventilation space is formed between the existing building and the extension building.
According to such an extension method, it is possible to satisfactorily ensure the lighting ventilation of the existing building and the extension building.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the extension method which improves the earthquake resistance during the extension of the building of the seismic isolation structure adjacent to the existing building of a seismic isolation structure.

1A to 1C are explanatory diagrams of the extension method of the present embodiment. FIG. 2A is a schematic plan view of a rooftop floor of an existing building and an extension building, and FIG. 2B is an explanatory diagram of a rigid member. It is a schematic plan view of the second and third floors of an existing building and an extension building. It is a schematic plan view of the first floor of an existing building and an extension building. It is a graph which shows a simulation result. It is a graph which shows a simulation result. It is a schematic sectional drawing of the existing building and the extension building made into the simulation object. It is a schematic plan view of the rooftop floor of the existing building and the extension building which were made into the simulation object.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1A to 1C are explanatory diagrams of the extension method of the present embodiment, and are schematic cross-sectional views of the existing building 10 and the extension building 20 as seen from the Y direction. FIG. 2A is a schematic plan view of the roof floor of the existing building 10 and the extension building 20, and FIG. 2B is an explanatory diagram of the rigid member 30. FIG. 3 is a schematic plan view of the second and third floors of the existing building 10 and the extension building 20. FIG. 4 is a schematic plan view of the first floor of the existing building 10 and the extension building 20. This embodiment is an example of a method of extending a three-story seismic isolation extension building 20 so as to be adjacent to the existing three-story seismic isolation structure 10 with a predetermined interval in the X direction. To

  The existing building 10 is a building in which a seismic isolation layer is interposed between the upper structure and the lower structure, and the seismic isolation pit 11 (first lower structure) formed by excavating the ground, and the seismic isolation It has a plurality of seismic isolation devices 12 installed on the bottom 11 a of the pit 11 and an upper structure 13 (first upper structure) constructed on the seismic isolation device 12. The seismic isolation device 12 is for insulating and supporting the upper structure 13 from the ground, extending the vibration of the upper structure 13 and mitigating shaking of the upper structure 13, for example, laminated rubber Examples include support and sliding support. The seismic isolation pit 11 has a bottom part 11a supported by a pile driven into the ground and a side wall 11b provided around the bottom part 11a so that the side wall 11b and the upper structure 13 do not come into contact with each other when an earthquake occurs. In addition, a space is provided between the side wall 11 b and the upper structure 13.

  And in order to construct the extension building 20 in which the seismic isolation layer is interposed between the upper structure and the lower structure like the existing building 10 so as to be adjacent to the existing building 10, first, as shown in FIG. 1A. The seismic isolation pit 21 (second lower structure) for the extension building 20 is formed on the land adjacent to the existing building 10. As with the seismic isolation pit 11 for the existing building 10, the seismic isolation pit 21 for the extension building 20 includes a bottom portion 21a supported by a pile driven into the ground, and a side wall 21b provided around the bottom portion 21a. Have. That is, the seismic isolation layer 10a (first seismic isolation layer) of the existing building 10 and the seismic isolation layer 20a (second seismic isolation layer) of the extension building 20 are both provided in the underground portion, and the seismic isolation layers of both buildings 10 and 20 are provided. Level (position in the vertical direction) is the same. In addition, you may provide a seismic isolation layer in intermediate | middle floors, such as between the 1st floor and the 2nd floor, for example, without providing a base isolation layer in the foundation part of a building.

  Next, as shown in FIG. 1B, a plurality of seismic isolation devices 22 are installed on the bottom portion 21 a of the seismic isolation pit 21 for the extension building 20, and the upper structure 23 (first structure) of the extension building 20 is placed on the seismic isolation device 22. 2 superstructure). In other words, the extension building 20 is constructed as a seismically isolated building that is independent from the existing building 10 and can be independent. In the present embodiment, as shown in FIG. 2A, the length in the Y direction of the upper structure 13 of the existing building 10 (hereinafter “existing upper structure 13”) and the upper structure 23 of the extension building 20 (hereinafter “extension”). The length of the upper structure 23 ") in the Y direction is made equal, the length of the existing upper structure 13 in the X direction is made longer than the length of the extension upper structure 23 in the X direction, and the weight of the existing upper structure 13 is increased. Is assumed to be heavier than the weight of the extension superstructure 23. In addition, the seismic isolation layer 20 a of the extension building 20 is designed so that the base isolation cycle of the extension building 20 is the same as the base isolation cycle of the existing building 10. Further, as shown in FIG. 4, the strong axis direction of the existing building 10 is the Y direction, and the strong axis direction of the extension building 20 is a direction that intersects the strong axis direction of the existing building 10 (in this case, the orthogonal direction). The direction. In addition, a strong axis is an axis | shaft with a stronger structural strength, for example, the direction along more earthquake-resistant walls turns into a strong-axis direction.

  Finally, as shown in FIG. 1C, the upper ends of the existing upper structure 13 and the extension upper structure 23 are connected to each other by the rigid member 30, and the lower ends of the existing upper structure 13 and the extension upper structure 23 are connected to each other. The extension is completed by connecting the rigid building 30 and integrating the existing building 10 and the extension building 20 together. Note that a crossing corridor 40 for moving between the existing building 10 and the extension building 20 may be provided as necessary. That is, in the extension method of the present embodiment, the existing building 10 and the extension building 20 are partially connected to form the daylighting ventilation space A that communicates with the outside between the existing building 10 and the extension building 20.

  Specifically, as shown in FIG. 2A, the roof top portions of the buildings 10 and 20 are connected by a plurality of steel braces 31 as the upper ends of the existing upper structure 13 and the extension upper structure 23. Specifically, as shown in FIG. 2B, an outer wall in which beams 132 and 232 spanned between columns 131 and 231 arranged in the Y direction at positions opposite to the existing upper structure 13 and the extension upper structure 23 are embedded. Gusset plates 33 are provided at the same height positions 133 and 233. The gusset plate 33 is provided with a through hole (not shown) through which the pin 32 passes. The steel brace 31 is formed by integrally providing a flat plate 312 at both ends of a steel cylindrical member 311, and the through plate (not shown) through which the pin 32 passes is also provided in the plate 312. . Then, the brace plate 312 on one end side of the steel brace 31 is overlaid on the gusset plate 33 on the existing upper structure 13 side, and the battledore plate 312 on the other end side is overlaid on the gusset plate 33 on the extension upper structure 23 side. Pins 32 are vertically penetrated and connected to the through holes of the wing plate 312 and the gusset plate 33. That is, the steel brace 31 is provided on the horizontal plane, and is connected to the upper structures 13 and 23 via the gusset plate 33 so as to be rotatable on the horizontal plane with the pin 32 as a fulcrum.

  Similarly, as shown in FIG. 4, as the lower ends of the existing upper structure 13 and the extension upper structure 23, the first floor portions of the buildings 10 and 20 are also connected by a plurality of steel braces 31. Yes. However, as shown in FIG. 3, the second and third floor portions of the buildings 10 and 20 are not connected by a steel brace 31. Thus, in the extension method of this embodiment, the existing building 10 and the extension building 20 are partially connected. The existing upper structure 13 and the extension upper structure 23 are not limited to being connected by the steel brace 31, and, for example, an H-shape is formed between the beam 132 of the existing upper structure 13 and the beam 232 of the extension upper structure 23. Even if the existing upper structure 13 and the extension upper structure 23 are connected by placing the steel (rigid member) in the X direction and placing concrete (rigid member) so that the H-shaped steel material is buried. Good.

  By the way, in a building having a base-isolated structure, a torsional vibration is generated due to the rigid center of the base-isolating layer and the center of gravity of the upper structure not matching (eccentricity), and the earthquake resistance of the building is lowered. Therefore, the existing building 10 is constructed so that the rigid center S1 of the seismic isolation layer of the existing building 10 and the center of gravity G1 of the existing upper structure 13 coincide. In addition, the seismic isolation layer is designed so that the rigidity of the seismic isolation layer when the extension is completed matches the center of gravity of the upper structure.

  Here, it is assumed that the existing building 10 and the extension building 20 are not partially connected as in the extension method of the present embodiment, but the existing building 10 and each floor of the extension building 20 are connected by a rigid member. It is assumed that the existing building 10 and the extension building 20 are completely integrated by covering the connecting portion between the building 10 and the extension building 20 with an outer wall. In other words, the side walls of the seismic isolation pit for the existing building were broken to integrate the seismic isolation pit for the existing building and the seismic isolation pit for the extension building, and built the extension building independently from the existing building. Assume that the foundation and the foundation of the extension building are connected (the lower ends of the upper structure are connected to each other), and a heavy upper structure is constructed at the connection part. In this case, if the weight difference between the upper structure of the existing building and the upper structure of the extension building is large, the center of gravity in the X direction when the foundations of the two buildings are connected becomes the center of gravity in the X direction when the extension is completed. In comparison, the weight of the upper structure is shifted to the building side where the weight is larger. In other words, since the stiffness of the seismic isolation layer and the center of gravity of the upper structure are shifted during the extension, there is a risk that if the earthquake occurs during the extension, the building may be twisted and vibrated.

  On the other hand, in the extension method of the present embodiment, the extension building 20 is constructed so as to be adjacent to the existing building 10 with a space therebetween, and the upper ends of the existing upper structure 13 and the extension upper structure 23 (for example, The roof top floors) are connected by the rigid member 30, and the lower ends of the existing upper structure 13 and the extension upper structure 23 (eg, the first floors) are connected by the rigid member 30. That is, since the extension building 20 is constructed separately from the existing building 10, the existing building 10 is not affected by the extension, and the seismic isolation function works on the existing building 10 during the extension as in the case before the extension. Further, since there is no heavy object between the existing building 10 and the extension building 20 as when the existing building 10 and the extension building 20 are completely integrated, the center of gravity of the seismic isolation layer rigid core S1 and the upper structure 13 is obtained. When the extension building 20 in which the rigid center S2 of the seismic isolation layer and the center of gravity G2 of the upper structure 23 are partially connected to the existing building 10 in which G1 is matched independently of the existing building 13 The rigid center of the seismic isolation layer in the integrated building and the center of gravity of the superstructure coincide. In other words, according to the extension method of the present embodiment, since the eccentricity during the extension (displacement between the stiffness of the seismic isolation layer and the center of gravity of the upper structure) can be suppressed, the generation of torsional vibration is suppressed and the extension is being performed. Can improve the earthquake resistance.

  Further, when the existing building 10 and the extension building 20 are completely integrated, the design of the extension building 20 is restricted according to the seismic isolation layer 10a of the existing building 10, or conversely, the seismic isolation layer of the existing building 10 is changed. It is necessary to readjust. On the other hand, in the extension method of this embodiment, since the extension building 20 and its seismic isolation layer 20a can be designed independently from the seismic isolation layer 10a of the existing building 10, design freedom is high and construction is performed. It can be simplified.

  Moreover, when integrating the existing building 10 and the extension building 20 completely, it is necessary to destroy the side wall 11b of the seismic isolation pit 11 for the existing building 10 and the outer wall of the existing building 10, or to connect each floor with a rigid member. Therefore, the workability is poor, and the existing building 10 is restricted in use. On the other hand, in the extension method of this embodiment, the seismic isolation pit 21 for the extension building 20 can be independently constructed, or the outer wall of the existing building 10 can be used as it is. Since the extension building 20 is only partially connected, the workability is good and the cost can be reduced. Moreover, the use restriction of the existing building 10 does not arise.

  Moreover, in the extension method of this embodiment, the lighting ventilation space A is formed between the existing building 10 and the extension building 20. FIG. Therefore, by providing windows or the like on the wall surfaces of the buildings 10 and 20 facing the daylight ventilation space A, the lighting of the buildings 10 and 20 can be obtained as compared with the case where the existing building 10 and the extension building 20 are completely integrated. Good ventilation can be secured.

  In addition, the existing building 10 and the extension building 20 having the seismic isolation structure are subjected to a long period of vibration by the seismic isolation devices 12 and 22, and the displacement of the upper structures 13 and 23 is increased. Therefore, if the existing building 10 and the extension building 20 are not connected by a rigid member, for example, if they are simply connected by a passageway, the upper structures 13 and 23 vibrate greatly with different periods and displacements. In such a case, the upper structures 13 and 23 collide with each other, which is dangerous. Therefore, it is necessary to separate the installation interval between the existing building 10 and the extension building 20, or to provide an expansion joint with a large movable range in the corridor in order to avoid collision between the upper structures 13 and 23.

  On the other hand, in the extension method of this embodiment, the upper end sides and the lower end sides of the existing upper structure 13 and the extension upper structure 23 are connected by the rigid members 30 respectively. For this reason, when the earthquake occurs, the existing upper structure 13 and the seismic isolation upper structure 23 vibrate together, so that the upper structures 13 and 23 can be prevented from colliding with each other and it is safe. Therefore, the extension building 20 can be constructed close to the existing building 10. Moreover, since the movable range of the expansion joint provided in the crossing corridor 40 can be made small, cost reduction can be achieved.

  Moreover, in the extension method of this embodiment, the rigid member 30 which connects the existing building 10 and the extension building 20 is provided on the horizontal surface, that is, the steel brace 31 is installed horizontally. Therefore, the horizontal seismic force can be efficiently transmitted from one of the existing upper structure 13 and the extension upper structure 23 to the other, and an extra force (horizontal component force) is applied to the rigid member 30. The two upper structures 13 and 23 can be vibrated together without being hung. Therefore, for example, the rigidity can be reduced by thinning the rigid member 30 and the cost can be reduced.

  Moreover, in the extension method of this embodiment, the rigid member 30 (steel brace 31) is connected with the upper structures 13 and 23 so that rotation is possible on a horizontal surface. Therefore, even when the vibration directions of the existing upper structure 13 and the extension upper structure 23 are different and intersect, relative displacement in the direction in which the existing upper structure 13 and the extension upper structure 23 intersect is possible. Twist of the structures 13 and 23 can be suppressed.

  Moreover, in the extension method of this embodiment, the seismic isolation cycle of the extension building 20 is set to be the same cycle as the seismic isolation cycle of the existing building 10. Therefore, the existing upper structure 13 and the seismic isolation upper structure 23 can be vibrated integrally without applying an extra force (tensile force or compressive force) to the rigid member 30. Therefore, for example, the rigid member 30 can be thinned or the number of the rigid members 30 can be reduced, and cost reduction can be achieved.

  Moreover, in the extension method of this embodiment, the seismic isolation layer 20a of the extension building 20 is provided at the same level as the seismic isolation layer 10a of the existing building 10 (here, the foundation portion of the building). By doing so, it becomes easy to provide the rigid member 30 (steel brace 31) which connects the existing upper structure 13 and the extension upper structure 23 on a horizontal surface. In addition, it becomes easy to design the seismic isolation layer of the extension building 20 so that the base isolation period of the extension building 20 is the same as that of the existing building 10.

  Further, in the extension method of the present embodiment, the strong axis of the extension building 20 intersects the strong axis of the existing building 10. Therefore, the existing upper structure 13 and the extension upper structure 23 can support each other so as to suppress the displacement of the other party. That is, with respect to the seismic force along the weak axis direction of one of the existing upper structure 13 and the extension upper structure 23, the displacement of the one upper structure is suppressed by the other upper structure. Can improve the earthquake resistance.

  5 and 6 are graphs showing simulation results, FIG. 7 is a schematic cross-sectional view of the existing building 50 and the extension building 60 to be simulated, and FIG. 8 is the existing building 50 and extension to be simulated. 3 is a schematic plan view of a rooftop floor of a building 60. FIG. Hereinafter, simulation results when an earthquake occurs in the partially connected existing building 50 and the extension building 60 will be described. As shown in FIGS. 7 and 8, the existing building 50 and the extension building 60 to be simulated are buildings with a 13-story RC structure, and seismic isolation layers 52 and 62 are respectively provided between the first and second floors. When viewed from above, the outer shape is rectangular, and one end side in the longitudinal direction of the existing building 50 and the vicinity of the center in the longitudinal direction of the extension building 60 are opposed to each other to form a T shape in plan view. It is arranged to make. Further, the strong axis direction of the existing building 50 (direction along the seismic wall 53) and the strong axis direction of the extension building 60 (direction along the seismic wall 63) are orthogonal to each other. Further, the upper floors (R floors) on the upper ends of the upper structures 51 and 61 of the existing building 50 and the extension building 60 are connected to each other by a plurality of steel braces 71, and the upper structures 51 and 61 are connected to each other. The lower part of the second floor or lower floors on the lower end side is an RC frame 70 (concrete is cast so that the H-shaped steel material spanned between the beam of the existing building 50 and the beam of the extension building 60 is buried) It is connected.

  Further, the longitudinal direction of the outer shape in plan view of the extension building 60 is 26.5 m, the direction along the earthquake-resistant wall 63 is 12.7 m, the weight is 73490 kN, and the longitudinal direction of the outer shape in plan view of the existing building 50 is 35. .4 m, the direction along the seismic wall 53 is 11.5 m, and the weight is 85486 kN. Further, it is assumed that the equivalent period of the extension building 60 at the time of level 2 deformation is 4.62 seconds, and the equivalent period of the existing building 50 is 4.55 seconds. The layer shear force and the absolute displacement acting on the extension building 60 and the existing building 50 when the notification wave Kobe EW is input as the simulated seismic motion in the strong axis direction of the extension building 60 are shown in the graphs of FIGS.

  FIG. 5A is a graph showing the result of the layer shear force acting on the extension building 60 when the earthquake occurs, and FIG. 5B shows the result of the layer shear force acting on the existing building 50 when the earthquake occurs. It is a graph. 6A is a graph showing the result of absolute displacement acting on the extension building 60 when an earthquake occurs, and FIG. 6B is a graph showing the result of absolute displacement acting on the existing building 50 when an earthquake occurs. is there. In each graph, the result when the upper structure 61, 51 of the extension building 60 and the upper structure 61, 51 of the existing building 50 is connected to the second floor or lower part (lower end sides) is “no connection”. In addition to the following parts, the result when the roof floors (upper end sides) are connected is referred to as “R floor connection” (the present invention), and the result when each floor is connected is referred to as “each layer connection”.

  As a result of the simulation, as shown in FIG. 5, when only the parts below the second floor are connected (no connection), the strong axis direction coincides with the input direction of the earthquake motion (extension building 60). In comparison, the laminar shear force acting on the weak axis side building (existing building 50) whose weak axis direction coincides with the input direction of the ground motion is increased. On the other hand, when each floor is connected (each layer connection), the layer shear force acting on the weak shaft side building can be suppressed, but the layer shear force on the lower floor of the strong shaft side building is greatly increased. I'm stuck. On the other hand, when connecting the part below the second floor and the rooftop floor (R floor connection), when connecting the layer shear force acting on the weak shaft side building only the part below the second floor (no connection) It was confirmed that the layer shear force on the lower floor of the strong shaft side building can be prevented from becoming significantly large.

  In addition, as shown in FIG. 6, the building on the weak shaft side is compared to the case where the part below the second floor is connected to the rooftop floor (R floor connection) and the case where only the part below the second floor is connected (no connection). It is confirmed that the deformation of the building on the weak shaft side can be suppressed as well as the case where each floor is connected (each layer connection).

  Therefore, from this simulation result, like the extension method of the present embodiment, the upper structures 61 of the extension building 60 and the upper structures 51 of the existing building 50 are connected to each other and the lower ends are also connected to each other. Compared with connecting each floor or connecting only the lower ends, it prevents the layer shear force acting on the strong shaft side building and the weak shaft side building (especially the lower floor) from becoming significantly large. However, it can be said that the deformation of the weak shaft side building can be suppressed.

  As mentioned above, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

  For example, the weight of the existing building may be lighter than the weight of the extension building. In addition, a rigid member (for example, a steel brace) that connects the existing upper structure and the extension upper structure may be provided to be inclined with respect to the horizontal plane, and fixed so that the rigid member does not rotate on the horizontal plane. Also good. Further, the seismic isolation cycle of the extension building may be different from the seismic isolation cycle of the existing building, or the seismic isolation layer of the extension building may be provided at a level different from that of the existing building. Moreover, you may make it the axis | shaft of the same direction, without making the strong axis of an extension building cross the strong axis of an existing building.

10 existing building, 10a base isolation layer (first base isolation layer), 11 base isolation pit (first substructure),
12 seismic isolation device, 13 superstructure (first superstructure),
20 extension building, 20a base isolation layer (second base isolation layer), 21 base isolation pit (second substructure),
22 seismic isolation device, 23 superstructure (second superstructure),
30 rigid members, 31 steel braces, 32 pins, 33 gusset plates,
40 passage corridor, 50 existing building, 51 superstructure, 52 base isolation layer, 53 seismic wall,
60 extension building, 61 superstructure, 62 base isolation layer, 63 earthquake resistant wall, 70 RC frame,
71 Steel brace, A Daylighting ventilation space,

Claims (7)

Between the second upper structure and the second lower structure so as to be adjacent to the existing building with the first seismic isolation layer interposed between the first upper structure and the first lower structure with a space therebetween. A step of constructing the extension building having a second seismic isolation layer interposed therein, wherein the weight of the second upper structure is different from the weight of the first upper structure;
The upper ends of the first upper structure and the second upper structure are connected by a rigid member, and the lower ends of the first upper structure and the second upper structure are connected by a rigid member , The floor between the upper end side connected by the rigid member and the lower end side connected by the rigid member is not connected by the rigid member ;
Have
An extension method characterized by using the existing building without breaking the outer wall . The extension method according to claim 1,
At least one of the rigid member on the upper end side and the rigid member on the lower end side is provided on a horizontal plane. The extension method according to claim 1 or 2,
An extension method comprising connecting at least one of the rigid member on the upper end side and the rigid member on the lower end side to the upper structure so as to be rotatable on a horizontal plane. The extension method according to any one of claims 1 to 3,
An extension method, wherein the seismic isolation period of the extension building is set to the same period as that of the existing building. The extension method according to any one of claims 1 to 4,
The extension method, wherein the second seismic isolation layer is provided at the same level as the first seismic isolation layer. The extension method according to any one of claims 1 to 5,
An extension method comprising crossing a strong axis of the extension building with a strong axis of the existing building. The extension method according to any one of claims 1 to 6,
An extension method, wherein a daylighting ventilation space is formed between the existing building and the extension building.

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