JP6166560B2 - Extension structure of seismic isolation building - Google Patents

Description

  The present invention relates to an extension structure of a base-isolated building.

  A method of extending a base-isolated building has been proposed in which an additional base-isolated building is integrated with an existing base-isolated building. For example, Patent Literature 1 discloses an extension method of a seismic isolation structure that connects an existing structure and the extension structure after the extension structure is constructed separately from the existing structure.

  However, in the extension method of the seismic isolation structure of Patent Document 1, the existing structure and the extension structure are connected to each other on the floor of the base isolation layer, so that the base isolation layer of the extension structure is the foundation of the existing structure. It must be placed at the same height as the seismic isolation layer. Therefore, restrictions are imposed on the design of the additional structure.

JP 2000-204772 A

  This invention considers the fact which concerns, and makes it a subject to provide the extension structure of a base isolation building which can make the design freedom of an extension base isolation building high.

In the invention of the first aspect , only the floor other than the floor constituting the basic seismic isolation layer of the existing seismic isolation building or the extension seismic isolation building is connected to the floor of the extension seismic isolation building or the existing seismic isolation building, This is an extension structure of a base-isolated building that integrates an existing base-isolated building and the above extension base-isolated building.

In the invention of the first aspect , since only the floors other than the floors constituting the basic seismic isolation layer of the existing seismic isolation building or the extension seismic isolation building are connected to the floor of the extension seismic isolation building or the existing seismic isolation building, The height of the base isolation layer of the building and the extension isolation building need not be the same.

  For example, there is no need to construct an underground floor in the expanded seismic isolation building for the connection between the existing seismic isolation building and the expanded seismic isolation building. In addition, for example, avoid existing floors that are difficult to connect with retaining walls, slopes, passages, corridors, roads, railways, etc. Seismic buildings can be connected to expanded seismic isolation buildings. As a result, it is possible to increase the degree of freedom in designing the extension seismic isolation building.

The invention of the second aspect is the extension structure of the base-isolated building of the first aspect , the layer rigidity of all the layers below the connected floor of the existing base-isolated building, and the connection of the additional base-isolated building The layer rigidity of all the floors below the floor is almost equal.

In the invention of the second aspect , the layer rigidity of all the layers below the floor to which the existing seismic isolation building is connected (hereinafter referred to as “the lower layer of the existing seismic isolation building”) and the extension seismic isolation building are connected. In the event of an earthquake, the lower layer of the existing seismic isolation building and the additional seismic isolation building are created by making the layer rigidity of all layers below the floor (hereinafter referred to as “lower seismic isolation building lower layer”) substantially equal. By making the lower layer behave integrally, it is difficult to produce a twisting difference or deformation difference between the existing seismic isolation building and the extension seismic isolation building, and the force acting on the connecting portion can be reduced. Thereby, for example, since the strength required for the connecting portion can be reduced, an easy connecting method or a connecting method in a short time can be used.

  In addition, by making the layer rigidity of the lower layer of the existing base isolation building approximately equal to the layer rigidity of the lower layer of the extension base isolation building, force is applied from the lower layer of the extension base isolation building to the lower layer of the existing base isolation building during an earthquake. It is possible to reduce the stress that occurs in the lower layer of the existing base-isolated building and becomes larger than before connecting the existing base-isolated building and the additional base-isolated building. Thereby, reinforcement of the existing seismic isolation building can be made unnecessary or reduced.

The invention of the third aspect is the extension structure of the base-isolated building of the first or second aspect , wherein the existing base-isolated building and the floor of the additional base-isolated building are connected by being fastened by a tension material. .

In the invention of the third aspect , the floors of the existing seismic isolation building and the extension seismic isolation building can be reliably connected by a method with good construction efficiency.

  Since this invention was set as the said structure, the design freedom of an extension seismic isolation building can be made high.

It is an elevation view which shows the extension structure of the seismic isolation building which concerns on embodiment of this invention. It is an enlarged view which shows the connection part which concerns on embodiment of this invention. It is an elevation view which shows the extension structure of the seismic isolation building which concerns on embodiment of this invention. It is an elevation view which shows the extension structure of the seismic isolation building which concerns on embodiment of this invention. It is an elevation view which shows the extension structure of the seismic isolation building which concerns on embodiment of this invention. It is an elevation view which shows the extension structure of the seismic isolation building which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. First, the extension structure of the seismic isolation building which concerns on embodiment of this invention is demonstrated.

  In the elevation view of FIG. 1, an extension structure 14 of the base isolation building in which the extension base isolation building 12 is constructed (added) adjacent to the existing base isolation building 10 is shown. The existing seismic isolation building 10 is a reinforced concrete building with 2 stories underground and 8 stories above the ground 16 and the expanded seismic isolation building 12 is the 1st underground and 10 stories above the ground 16 It is a reinforced concrete building.

  The existing base-isolated building 10 includes a structure 20 that is supported by base isolation on the ground 16 by a base isolation layer 18. The base seismic isolation layer 18 is provided with a plurality of seismic isolation devices 24 such as laminated rubber bearings which are installed on a concrete foundation 22 provided on the ground 16 and support the structure 20 in a seismic isolation manner.

  The extension seismic isolation building 12 has a structure 28 that is seismically isolated and supported on the ground 16 by a basic seismic isolation layer 26. The base seismic isolation layer 26 is provided with a plurality of seismic isolation devices 32 such as laminated rubber bearings which are installed on a concrete foundation 30 provided on the ground 16 and support the structure 28 in a seismic isolation manner.

  The existing base-isolated building 10 and the additional base-isolated building 12 connect the floor slab 34 arranged on the first floor above the existing base-isolated building 10 and the floor slab 36 arranged on the first floor above the base-isolated building 12. Are integrated. That is, the first floor above the existing base-isolated building 10 and the first floor above the expanded base-isolated building 12 are connected.

  In other locations (locations other than floor slabs 34 and 36), the existing seismic isolation building 10 and the additional seismic isolation building 12 are not connected, and the existing base isolation building 10 and the additional seismic isolation building 12 are on the second floor above the ground. As described above, the expansion joint 38 is provided between the floor slabs and is structurally separated and independent.

  That is, in the extension structure 14 of the seismic isolation building, only floors other than the floor constituting the basic seismic isolation layer 18 of the existing seismic isolation building 10 (the first floor in the example of FIG. 1) are the floors of the additional seismic isolation building 12. (In the example of FIG. 1), the existing seismic isolation building 10 and the extension seismic isolation building 12 are integrated.

  As shown in FIG. 2, the floor slab 34 of the existing base-isolated building 10 and the floor slab 36 of the additional base-isolated building 12 include the girder 58 of the existing base-isolated building 10 provided integrally with the floor slab 34, and the floor slab. The connecting beam 60 provided integrally with 36 is connected by being fastened with a tension material. FIG. 2 shows an example in which a PC steel bar 46 is used as a tendon. Hereinafter, a portion where the existing base-isolated building 10 (large beam 58) and the additional base-isolated building 12 (connecting beam 60) are connected is referred to as a connecting portion P.

  In addition, as shown in FIG. 1, the layer rigidity of the lower layer 48 for all layers below the connection part P of the existing base-isolated building 10 and all the parts below the connection part P of the additional base-isolated building 12. The layer rigidity of the lower layer 50 corresponding to the layer is made substantially equal. The lower layer 48 is a layer that combines the base isolation layer 18 of the existing base isolation building 10, the basement level 52, and the basement level 54, and the lower level 50 is an additional base isolation building. It is a layer that combines the 12 basic seismic isolation layers 26 and the level 56 of the first basement. That is, the layer rigidity of the entire lower layer (lower layer 48) below the floor to which the existing base-isolated building 10 is connected (the first floor above the ground) and the floor to which the additional base-isolated building 12 is connected (the first floor above the ground) The layer rigidity of the entire lower layer (lower layer 50) is made substantially equal.

  The extension seismic isolation building 12 is constructed in a state where the seismic isolation device 24 of the existing seismic isolation building 10 and the seismic isolation device 32 of the extension seismic isolation building 12 are supported without being locked. Then, after the existing seismic isolation building 10 and the additional seismic isolation building 12 are connected, the existing seismic isolation building 10 and the additional seismic isolation building 12 are constructed until the existing seismic isolation building 10 and the additional seismic isolation building 12 are structurally satisfactory. The seismic building 10 and the expanded seismic isolation building 12 are connected. For example, the existing base-isolated building 10 and the extension base-isolated building 12 are connected after all the extension base-isolated buildings 12 are built or after about 80% of the extension base-isolated buildings 12 are built. If there is no structural or construction problem, the existing base-isolated building 10 and the extension base-isolated building 12 may be connected at any timing.

  Next, the operation and effect of the extension structure for the base-isolated building according to the embodiment of the present invention will be described.

  In the seismic isolation building extension structure 14 according to the embodiment of the present invention, as shown in FIG. 1, floors other than the floors constituting the basic seismic isolation layer 18 of the existing seismic isolation building 10 (in the example of this embodiment, existing Since only the basement floor of the base isolation building 10 is connected to the floor of the extension base isolation building 12 (in the example of this embodiment, the basement floor of the base isolation building 12), the basic isolation of the existing base isolation building 10 The height of the seismic layer 18 and the base seismic isolation layer 26 of the expanded seismic isolation building 12 need not be the same.

  Thereby, for example, there is no need to construct an underground floor in the extension seismic isolation building 12 for connecting the existing seismic isolation building 10 and the extension seismic isolation building 12 (in this embodiment, the extension seismic isolation building 12 Does not have to be 2 stories underground). This is particularly effective when there is an existing structure at the depth at which the basement is constructed and the root cutting is troublesome or difficult.

  Also, for example, avoid floors that are difficult to connect due to retaining walls, slopes, passages, corridors, roads, railways, etc. that are or are located on the existing seismic isolated building 10 side or the expanded seismic isolated building 12 side. Existing seismic isolation building 10 and expansion seismic isolation building 12 can be connected, so that the seismic expansion, seismic isolation, removal, and design changes for retaining walls, slopes, passages, corridors, roads, railways, etc. are not required. Building 12 can be expanded. By these, the freedom degree of design of the extension seismic isolation building 12 can be made high.

  Furthermore, in the extension structure 14 of the base-isolated building according to the embodiment of the present invention, the layer rigidity of the entire layer (lower layer 48) below the floor (the first floor above) to which the existing base-isolated building 10 is connected, By making the layer rigidity of all layers (lower layer 50) below the connected floor (the first floor above ground) of the expanded seismic isolation building 12 substantially equal, the lower layer 48 of the existing seismic isolation building 10 and The lower layer 50 of the extension seismic isolation building 12 is made to behave integrally so that the existing seismic isolation building 10 and the extension seismic isolation building 12 are less likely to be twisted or deformed, and the force acting on the connecting portion P is reduced. Can do. Thereby, since the intensity | strength required for the connection part P can be reduced, for example, the easy connection method and the connection method in a short time can be used.

  Further, by making the layer rigidity of the lower layer 48 of the existing base-isolated building 10 and the layer rigidity of the lower layer 50 of the additional base-isolated building 12 substantially equal, the existing base-isolation is started from the lower layer 50 of the additional base-isolated building 12 in the event of an earthquake. Reduce the stress generated in the lower layer 48 of the existing seismic isolated building 10 due to the force flowing to the lower layer 48 of the building 10 than before connecting the existing seismic isolated building 10 and the additional seismic isolated building 12. Can do. Thereby, renovation of the existing base isolation building 10 (for example, reinforcement of the frame of the existing base isolation building 10, replacement of the base isolation device 24 of the existing base isolation building 10) can be made unnecessary or reduced.

  Furthermore, in the extension structure 14 of the seismic isolation building according to the embodiment of the present invention, the floors of the existing seismic isolation building 10 and the additional seismic isolation building 12 are connected by a tension member (PC steel bar 46) at the connecting portion P. It can be reliably connected by a method with good construction efficiency.

  Moreover, in the extension structure 14 of the seismic isolation building which concerns on embodiment of this invention, the floor of the existing seismic isolation building 10 and the extension seismic isolation building 12 is joined by the connection part P, From the tight floor (connection part P) The clearance between the upper floors can be set to about 100 mm (generally, the clearance required when the conventional seismic isolation buildings are connected to each other without connecting them at the building scale shown in FIG. 1 is about 1000 mm. The clearance required when connecting conventional earthquake-resistant buildings next to each other without being connected is about 400 mm).

  As a result, an expansion joint 38 that can accommodate a clearance of about 100 mm may be installed, so that “equipment cost”, “installation cost”, “decrease in usability”, and “decrease in design of building exterior” are kept low. Can do. In addition, since the additional seismic isolation building 12 can be constructed near the existing seismic isolation building 10, the site necessary for adding the additional seismic isolation building 12 can be reduced. As a result, the site can be effectively used and an efficient construction plan can be performed.

  The embodiment of the present invention has been described above.

  In this embodiment, as shown in FIG. 1, only the floors other than the floors constituting the basic seismic isolation layer 18 of the existing seismic isolation building 10 are connected to the floor of the additional seismic isolation building 12 to Although the example which integrated the building 10 and the extension seismic isolation building 12 was shown, only floors other than the floor which comprises the basic seismic isolation layer 26 of the extension seismic isolation building 12 are connected to the floor of the existing seismic isolation building 10. The existing seismic isolation building 10 and the extension seismic isolation building 12 may be integrated. That is, it is only necessary that either one of the existing seismic isolation building 10 and the additional seismic isolation building 12 is not connected on the floor constituting the basic seismic isolation layer.

  Therefore, the depth of the basement floor of the existing seismic isolation building 10 and the extension base isolation building 12, the height of the ground floor, and the number of basement floors and ground floors may be equal or different. For example, the structure of the extension structure of the base isolation building according to the present invention may be configured as the extension structure 62, 64, 66, 68 of the base isolation building shown in FIGS. In the seismic isolation building extension structure 62 shown in FIG. 3, the existing seismic isolation building 10 is a reinforced concrete building with 2 stories underground and 5 stories above the ground 16, and the additional seismic isolation building 12 is It is a reinforced concrete building with 1 basement and 7 floors above ground. Then, the first floor above the existing base-isolated building 10 (floor slab placed on the first floor above ground) and the first floor above the expanded base-isolated building 12 (floor slab placed on the first floor above ground) are tensioned at the connecting portion P. The expansion joint 38 is installed between the floor slabs which are tightly coupled with each other and are arranged on the second floor or higher of the existing base isolation building 10 and the extension base isolation building 12.

  In the seismic isolation building extension structure 64 shown in FIG. 4, the existing base isolation building 10 is a reinforced concrete building with two floors below and five floors above the ground 16, and the additional base isolation building 12 is the ground 16. It is a reinforced concrete building with 7 stories above the ground. Then, the first floor above the existing base-isolated building 10 (floor slab placed on the first floor above ground) and the first floor above the expanded base-isolated building 12 (floor slab placed on the first floor above ground) are tensioned at the connecting portion P. The expansion joint 38 is installed between the floor slabs which are tightly coupled with each other and are arranged on the second floor or higher of the existing base isolation building 10 and the extension base isolation building 12.

  In the seismic isolated building extension structure 66 shown in FIG. 5, the existing seismic isolated building 10 is a reinforced concrete building having two basements and five stories above the ground 16, and the additional seismic isolated building 12 is the ground 16. It is a reinforced concrete building with 3 floors above ground and 5 floors above ground. Then, the second basement of the existing base-isolated building 10 (floor slab placed on the second basement) and the second basement of the additional base-isolated building 12 (floor slab placed on the second basement) are tensioned at the connecting part P. The expansion joint 38 is installed between the floor slabs which are tightly coupled with each other and are arranged on the first basement or more of the existing base isolation building 10 and the extension base isolation building 12.

  In the seismic isolated building extension structure 68 shown in FIG. 6, the existing seismic isolated building 10 is a reinforced concrete building of 2 stories underground and 5 stories above the ground 16, and the additional seismic isolated building 12 is It is a reinforced concrete building with 2 stories underground and 7 stories above ground. Then, the first floor above the existing base-isolated building 10 (floor slab placed on the first floor above ground) and the first floor above the expanded base-isolated building 12 (floor slab placed on the first floor above ground) are tensioned at the connecting portion P. The expansion joint 38 is installed between the floor slabs which are tightly coupled with each other and are arranged on the second floor or higher of the existing base isolation building 10 and the extension base isolation building 12.

  Further, in the present embodiment, as shown in FIG. 1, only the floors other than the floor constituting the basic seismic isolation layer 18 of the existing seismic isolation building 10 are connected to the floor of the additional seismic isolation building 12 to Although the example which integrated the building 10 and the extension seismic isolation building 12 was shown, if either one of the existing base isolation building 10 and the extension base isolation building 12 was not connected on the floor which comprises a base isolation layer, it connected. The floors other than the floors (in the example of the present embodiment, the ground floor of the existing seismic isolated building 10 and the floor other than the ground first floor of the expanded seismic isolated building 12) may not be connected, or may be connected. . If the number of floors to be connected is reduced, the labor for repairing the existing seismic isolation building 10 can be reduced, and the construction period and costs can be reduced. If the number of floors to be connected is increased, the clearance between the existing seismic isolation building 10 and the additional seismic isolation building 12 can be reduced.

  The floor to be connected is preferably the lower floor as much as possible, but may be the upper floor as long as the effect of the present invention can be obtained. When connecting with only one floor, it is preferable to connect with the lower floor as much as possible because the degree of integration of the lower layer of the building can be increased. However, the upper floor may be used as long as the effect of the present invention is obtained.

  Further, in the present embodiment, an example is shown in which the existing seismic isolation building 10 and the extension seismic isolation building 12 are coupled and connected with a tension material. However, the existing seismic isolation building 10 and the extension seismic isolation building 12 can be integrated. Any method can be used. For example, it is possible to expand the existing base-isolated building 10 by rolling the concrete of the frame beams that make up the existing base-isolated building 10 to expose the beam reinforcement and connecting it to the beam reinforcing bars of the frame beams that make up the additional base-isolated building 12. The seismic isolation building 12 may be connected, or by installing a post-construction anchor on the frame wall constituting the existing seismic isolation building 10 and connecting to the beam reinforcement of the structural beam constituting the additional seismic isolation building 12, The existing base-isolated building 10 and the extension base-isolated building 12 may be connected. Moreover, when the frame of the existing base-isolated building 10 and the additional base-isolated building 12 is a steel frame, the frames of the existing base-isolated building 10 and the additional base-isolated building 12 may be connected by welding or bolt joining.

  Further, the extension seismic isolation building 12 shown in the present embodiment may have a building structure that is independently established in the long-term design, or is established in the long-term design by being integrated with the existing seismic isolation building 10. It may be a building structure. If the extension seismic isolation building 12 has a building structure that is established independently in the long-term design, it is possible to omit the fireproof coating on the connection part P on the existing base isolation building 10 side (the connection of the connection part P is broken by the fire). In this case, the additional seismic isolation building 12 can be built independently without falling down).

  Furthermore, in the present embodiment, an example in which the layer rigidity of the lower layer 48 of the existing base-isolated building 10 and the layer rigidity of the lower layer 50 of the additional base-isolated building 12 is substantially equal is shown. The lower layer 50 of the extension seismic isolation building 12 may be designed so as to be substantially equal to the layer rigidity of the layer 48, or the existing base isolation building is substantially equal to the layer rigidity of the lower layer 50 of the extension seismic isolation building 12. Ten lower layers 48 may be renovated, or the lower layer 50 of the additional seismic isolated building 12 is designed to be substantially equal to the newly set layer rigidity, and the lower layer 48 of the existing seismic isolated building 10 is used. Renovation work may be performed.

  In the present embodiment, an example in which the layer rigidity of the lower layer 48 of the existing base-isolated building 10 and the layer rigidity of the lower layer 50 of the additional base-isolated building 12 is substantially equal is shown. The layer rigidity of the layer 48 and the layer rigidity of the lower layer 50 of the extension seismic isolation building 12 may not be completely equal. The layer rigidity of the lower layer 48 of the existing base isolation building 10 and the lower part of the extension isolation building 12 The layer rigidity of the layer 50 should just be substantially equal. That is, at the time of an earthquake, the lower layer 48 of the existing base-isolated building 10 and the lower layer 50 of the additional base-isolated building 12 are caused to behave integrally so that a twisting difference or deformation difference is caused between the existing base-isolated building 10 and the additional base-isolated building 12. It is less likely to occur and the force acting on the connecting portion P can be reduced. In addition, when an earthquake occurs, the force flows from the lower layer 50 of the additional seismic isolation building 12 to the lower layer 48 of the existing seismic isolation building 10 and the existing seismic isolation If the stress generated in the lower layer 48 of the building 10 can be reduced from that before the existing base-isolated building 10 and the additional base-isolated building 12 are connected, the layer rigidity of the lower layer 48 of the existing base-isolated building 10 can be reduced. And the layer rigidity of the lower layer 50 of the extension seismic isolation building 12 may be made completely equal, or may be made substantially equal.

  Further, in the present embodiment, an example in which the existing base-isolated building 10 and the extension base-isolated building 12 are reinforced concrete structures has been shown. It can be applied to existing and additional base-isolated buildings of various structures and scales, such as Steel Tube (filled steel pipe concrete structure) and their mixed structures.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10 Existing base-isolated building 12 Additional base-isolated building 14, 62, 64, 66, 68 Base-isolated building extension structure 18, 26 Base-isolated layer 46 Steel bar (tensile material)

Claims (2)

Connect only the floors other than the floors that make up the basic seismic isolation layer of the existing seismic isolation building or the extension seismic isolation building to the floor of the extension seismic isolation building or the existing seismic isolation building, and add the existing seismic isolation building and the extension Integrated seismic isolation building, and
The additional seismic isolation in which the layer rigidity of all layers below the connected floor of the existing base isolation building differs from the height direction of the base isolation layer and the base isolation layer of the existing base isolation building An extension structure of a base-isolated building in which the layer rigidity of all layers below the connected floor of the building is substantially equal . Connect only the floors other than the floors that make up the basic seismic isolation layer of the existing seismic isolation building or the extension seismic isolation building to the floor of the extension seismic isolation building or the existing seismic isolation building, and add the existing seismic isolation building and the extension An extension structure of the seismic isolation building integrated with the seismic isolation building, and the existing seismic isolation building and the expanded seismic isolation building are connected by a tension material.

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