JP5757191B2 - Structure for preventing overturning of a base-isolated building and a base-isolated building equipped with the structure - Google Patents

Description

  The present invention relates to a structure for preventing overturning of a base-isolated building and a base-isolated building having the structure.

  Conventionally, in high-rise buildings, seismic isolation devices such as laminated rubber have been installed between the upper structure and the lower structure, such as between the building body and the foundation. Shifting from the dominant period band to the long period side, the response acceleration is reduced to suppress shaking.

  On the other hand, in a base-isolated building where the aspect ratio is particularly large and a tipping moment is likely to occur due to rolling, shear deformation on each floor is required to prevent the upper structure (building body) supported by the base-isolating device from tipping over. It is necessary to suppress the corner to a certain value or less, and this upper structure also has a problem in that the strength (proof strength) corresponding to the upper structure is required and the cost is increased.

  On the other hand, in Patent Document 1, a plurality of first seismic isolation devices are installed between the lower structure and the upper structure, and a pulling force acting on these first seismic isolation devices is received as a compression force. A seismic isolation building is disclosed in which a second seismic isolation device (pullout resistance means) is installed.

  And in this patent document 1, while installing the 2nd seismic isolation device on the 2nd seismic isolation device base part formed overhanging the outer peripheral part side of the upper structure body, ground isolation pit frame, adjacent buildings, etc. The upper end portion of the second seismic isolation device is supported by a second seismic isolation device restraining portion that is fixed to the side and disposed on the outside of the building. Thus, the second seismic isolation device and the second seismic isolation device exhibit the seismic isolation performance against the roll of the building, and the pulling force acting on the first seismic isolation device is used as the second seismic isolation device base and the second seismic isolation device. The second seismic isolation device sandwiched between the seismic isolation device restraining portions can receive the compressive force, thereby substantially suppressing the locking of the upper structure and preventing the upper structure from overturning.

JP 2009-97243 A

  However, in the seismic isolation building disclosed in Patent Document 1, a second seismic isolation device base portion that is formed to project on the outer peripheral side of the upper structure, and a U-shaped member that is disposed outside the building. Since the second seismic isolation device holding part and the second seismic isolation device constitute a fall prevention structure, that is, the fall prevention structure is provided only on the outside of the building. The lower the degree of freedom, the higher the aspect ratio (the greater the moment of falling), the more difficult it is to apply.

  In addition, since the upper structure is substantially prevented from being rocked and prevented from falling, the vertical and horizontal vibration control effect cannot be obtained (provided).

  In view of the above circumstances, the present invention can reliably prevent overturning even in a building having a large aspect ratio while allowing rocking, and can further provide vibration control performance in the vertical and horizontal directions. The purpose is to provide a structure for preventing the fall of a base-isolated building and a base-isolated building having the structure.

  In order to achieve the above object, the present invention provides the following means.

The structure for preventing overturning of a base-isolated building according to the present invention is a structure for preventing overturning of a base-isolated building in which a base-isolating device is interposed between an upper structure and a lower structure, and is disposed outside the base-isolated building. An outer fall prevention structure provided inside and an inner fall prevention structure disposed inside the seismic isolation building, and the outer fall prevention structure is connected to the upper end side of the seismic isolation device. The upper seismic isolation device fixing member is extended to the outside in the lateral direction, and is connected to the lower structure and extends in the vertical direction with a predetermined gap in the lateral direction from the outer restraint portion. And an outer fall prevention structure main body extending above the outer holding portion with a predetermined gap in the vertical direction, and the inner fall prevention structure includes the upper seismic isolation device. One end is connected to the fixing member or the lower structure, and it extends vertically. A side part and an inner holding part extending in a lateral direction connected to the side part, and a lateral part of the side part and the lower seismic isolation device fixing member and / or the upper seismic isolation device fixing member. The lower seismic isolation device fixing member and / or a predetermined gap between the inner restraining portion and the lower seismic isolation device fixing member or the upper seismic isolation device fixing member Or an inner fall prevention structure main body disposed so as to surround the upper seismic isolation device fixing member , and a vertical gap between the outer holding portion and the outer fall prevention structure main body, and In the vertical gap between the inner restraining part and the lower seismic isolation device fixing member or the upper seismic isolation device fixing member, the outer restraining part and the outer fall prevention structure main body part, and / or the inner side Holding part and part for fixing the lower seismic isolation device Or by connecting the ends to the upper isolator fixing member, wherein the vibration control device is provided.

  In this invention, when vibration energy acts due to an earthquake or the like and a roll occurs in a building, the seismic isolation device such as laminated rubber is deformed, so that the natural period of the upper structure is, for example, the dominant period band of seismic motion. Therefore, it is possible to suppress the shaking by reducing the response acceleration of the upper structure body.

  On the other hand, when vibration energy acts on the upper structure and rocking occurs, the pulling force acts on the seismic isolation device. However, the outer restraining part of the outer fall prevention structure and the outer fall prevention structure The amount of displacement in the vertical direction of the upper structure by the main body part and by the lower base isolation device fixing member or the upper base isolation device fixing member and the inner fall prevention structure main body part (inner holding part) of the inner fall prevention structure Can be regulated. For this reason, it is possible to suppress the shaking of the upper structure, to reduce the pulling force acting on the seismic isolation device, and to increase the yield strength against the pulling force.

Furthermore , in the seismic isolation device, the vertical gap between the outer holding part and the outer fall prevention structure main body part and / or the vertical gap between the inner holding part and the lower seismic isolation device fixing member or the upper seismic isolation device fixing member Since the vibration control device is installed without any vibration, the vibration energy acts on the upper structure, causing rocking and the vibration control device (super high damping viscoelastic damper, lead damper, friction damper, steel damper, etc.) This makes it possible to attenuate vibration energy. At the same time, a horizontal displacement attenuation effect can be obtained.

Seismic isolation building of the present invention, characterized in that a seismic isolation building comprising interposed the seismic isolation device between the upper structure and the lower structure, and a fall prevention structure of the above seismic isolation building And

  In this invention, it becomes possible to obtain the operational effect of the above-described structure for preventing overturning of a base-isolated building.

  The structure for preventing overturning of a base-isolated building according to the present invention and the base-isolated building equipped with the same, when vibration energy acts on the upper structure and a shake occurs, the outer restraining part and the outer side overturn preventing part of the outer overturn preventing structure Depending on the structure main body, and by the lower seismic isolation device fixing member or the upper seismic isolation device fixing member and the inner fall prevention structure main body inner restraining portion of the inner fall prevention structure, the vertical structure and the horizontal direction of the upper structure It becomes possible to regulate the amount of displacement. As a result, it is possible to suppress the swing of the upper structure while allowing locking, to reduce the pulling force acting on the seismic isolation device, and to prevent the upper structure from falling over. Become.

  That is, the falling moment of the tower building having a large aspect ratio can be processed to prevent the seismic isolation device from being lifted up so that the base isolation building can be prevented from falling. For this reason, it is not necessary to construct the upper structure with high rigidity and high strength so that the shear deformation angle of each floor of the upper structure is kept below a certain value, and it is possible to construct a seismic isolation building at low cost. . In other words, it is possible to reduce the proof stress of the upper structure and provide a less expensive seismic isolation building.

  In addition, the structure to prevent the upper structure from falling by the inner fall prevention structure as well as the outer fall prevention structure increases the degree of design freedom compared to conventional seismic isolation buildings (falling prevention structure), and the aspect ratio. Even with a large base-isolated building, it is possible to reliably prevent the fall by arranging the outer fall prevention structure and the inner fall prevention structure in a well-balanced manner.

  Furthermore, since the upper structure is allowed to lock while allowing the upper structure to be locked by the outer fall prevention structure and the inner fall prevention structure, the vertical clearance and / or the inner gap between the outer restraining part and the outer fall prevention structure main body part. Effectively imparts vibration energy attenuation performance by installing a damping device inside the vertical gap between the holding part and the lower base isolation device fixing member or upper base isolation device fixing member, or inside the upper structure It is also possible to do. For this reason, it is possible to prevent the fall more reliably.

It is a figure which shows the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention, and a base isolation building. It is the X1-X1 arrow view figure of FIG. It is a figure which shows the outer side fall prevention structure of the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention. It is a figure which shows the inner side fall prevention structure of the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention. It is a figure which shows an example of the damping device of the fall prevention structure of the seismic isolation building which concerns on one Embodiment of this invention. FIG. 6 is a view taken along line X1-X1 in FIG. 5. It is a figure which shows the state in which the horizontal force acted on the damping device shown in FIG. It is a figure which shows the state which the compression force acted on the damping device shown in FIG. It is a figure which shows the state which the tensile force acted on the damping device shown in FIG. It is a figure which shows the method of manufacturing the damping device main-body part of the damping device shown in FIG. It is a figure which shows the method of forming (manufacturing) and arrange | positioning the damping device shown in FIG. It is a figure which shows the modification of the fall prevention structure of the base isolation building which concerns on one Embodiment of this invention, and is a figure which shows an example of the fall prevention structure of the base isolation building in the case of applying to a basic base isolation building. It is a X1-X1 line arrow directional view of FIG. It is a figure which shows the modification of the fall prevention structure (inside fall prevention structure) of the seismic isolation building which concerns on one Embodiment of this invention. It is the X1-X1 line arrow directional view of FIG. It is a figure which shows the modification of the fall prevention structure (inside fall prevention structure) of the seismic isolation building which concerns on one Embodiment of this invention. It is a X1-X1 line arrow directional view of FIG.

  Hereinafter, with reference to FIGS. 1 to 11, a structure for preventing overturning of a seismic isolation building according to an embodiment of the present invention and a seismic isolation building including the same will be described.

  As shown in FIG. 1, the seismic isolation building A of this embodiment is a high-rise building with a large aspect ratio in which the seismic isolation device 1 is interposed between the upper structural body A1 and the lower structural body A2, and prevents falling. Structure B (B1, B2) is provided. The upper structure A1 is a building body composed of a plurality of layers, and includes beams, columns, slabs, outer walls, and the like, and the lower structure A2 includes a plurality of support piles 2 and a foundation bottom slab (foundation slab) 3. ing.

  In addition, this seismic isolation building A is provided with a seismic isolation device installation floor P in which columns 4 and beams are rigidly joined to the foundation bottom slab 3 of the lower structure A2 and further reinforced with seismic walls as necessary. . And the seismic isolation device 1 such as laminated rubber is mounted on the lower seismic isolation device fixing member 5 which is rigidly joined to the upper part of the seismic isolation device installation floor P. Further, an upper seismic isolation device fixing member 6 having a rigidly bonded beam is provided at the lower part of the upper structure A1, and the upper base is connected to the upper seismic isolation device fixing member 6 to provide the seismic isolation device 1. ing.

  That is, the seismic isolation building A of this embodiment is configured as an intermediate floor seismic isolation building in which the seismic isolation device 1 is provided on the intermediate floor above the lower structure A2 including the support pile 2 and the foundation bottom slab 3. For example, the position of the broken line S in FIG. 1 is the ground surface GL, the base isolation plate 3 is used as the lower base isolation device fixing member 5, the base isolation device 1 is installed, and the base isolation building A is constructed as the base base isolation building. Also good. Moreover, it is desirable that the seismic isolation device 1 is installed so as to be displaceable in the vertical direction, as shown in FIGS. 5 and 6 of Patent Document 1, for example.

  The fall prevention structure B of the seismic isolation building according to the present embodiment is provided on the outer peripheral side of the building, and is arranged inside the outer fall prevention structure B1 disposed outside the seismic isolation building A and inside the seismic isolation building A. It is comprised with the inner side fall prevention structure B2 provided.

  Further, as shown in FIGS. 1 to 3, the outer fall prevention structure B <b> 1 includes an outer holding portion 7 and an outer fall prevention structure main body portion 8, and the outer hold portion 7 is an upper end portion of the seismic isolation device 1. The upper seismic isolation device fixing member 6 of the upper structure A1 connecting the sides is formed to extend outward in the lateral direction T1. As shown in FIG. 3, the outer toppling prevention structure main body 8 is rigidly joined at one end to the base bottom plate 3 (lower structure A2), and a predetermined gap H1 is formed in the lateral direction T1 with the outer holding portion 7. It extends in the vertical direction T2 and extends on the outer holding portion 7 with a predetermined gap H2 in the vertical direction T2. That is, the outer fall-preventing structure main body 8 is formed in a U-shaped cross section, is connected to the lower structure A2 and extends from the outside of the seismic isolation building A onto the outer holding portion 7, On the holding part 7, it is extended so that it may overlap with the up-down direction T2. Further, as shown in FIGS. 1 and 3, the outer fall prevention structure main body 8 of the present embodiment is rigidly joined to the column 4 on the outer peripheral side of the seismic isolation device installation floor P and the lower seismic isolation device fixing member 5. Is provided.

  Further, as shown in FIGS. 1 to 3, the outer fall prevention structure B <b> 1 of the present embodiment includes a seismic control device 9 instead of the seismic isolation device, and the seismic control device 9 includes the outer restraining portion 7 and the outer side. The end portions are provided in the gap H2 in the vertical direction T2 of the fall prevention structure main body portion 8 so as to be connected to the outer holding portion 7 and the outer fall prevention structure main body portion 8, respectively.

  And such an outside fall prevention structure B1 constructs the outer side suppression part 7 so that the outer peripheral part of the upper seismic isolation device fixing member 6 may be expanded outside, and connects one end part to this outer side suppression part 7. The vibration control device 9 is installed on the outer holding portion 7, and the outer fall prevention structure main body portion 8 is connected to the lower structure A2, and the other end of the outer fall prevention structure main body portion 8 and the vibration control device 9 is installed. Constructed by connecting parts.

  On the other hand, as shown in FIG. 1 to FIG. 4, the inner fall prevention structure B2 of the present embodiment includes an inner fall prevention structure main body 10, and the inner fall prevention structure main body 10 includes the lower structure A <b> 2. One end is rigidly joined and connected to the base bottom plate 3, and the pair of side portions 10a and 10b extended in the vertical direction T2 and the other end of the pair of side portions 10a and 10b are connected to each other in the horizontal direction T1 (extension) And an inner holding portion 10c provided. That is, the inner fall prevention structure main body 10 of the present embodiment is formed in a gate shape, and the upper seismic isolation device fixing member 6 and the lower seismic isolation device are secured by the pair of side portions 10a and 10b and the inner holding portion 10c. It arrange | positions so that the member 5 for use may be enclosed. Further, at this time, the inner fall prevention structure main body portion 10 is formed between the pair of side portions 10a and 10b and the transverse direction T1 between the lower seismic isolation device fixing member 5 and the upper seismic isolation device fixing member 6, and the inner side. Predetermined gaps H3 and H4 are respectively provided between the holding part 10c and the vertical direction T2 of the upper seismic isolation device fixing member 6.

  Furthermore, in the inner fall prevention structure B2 of the present embodiment, the vibration control device 11 is provided in the gap H4 in the vertical direction T2 between the upper seismic isolation device fixing member 6 and the inner holding portion 10c. Are provided with the end portions connected to the upper seismic isolation device fixing member 6 and the inner holding portion 10c, respectively.

  Here, for example, the damping devices 9 and 11 shown in FIGS. 5 and 6 can be applied to the damping devices 9 and 11 included in the outer fall prevention structure B1 and the inner fall prevention structure B2. In this example, the vibration control devices 9 and 11 are formed by laminating ultrahigh damping viscoelastic rubbers 13 and 14 on both sides with a metal plate 12 in between, and outside the ultrahigh damping viscoelastic rubbers 13 and 14. The rubber-side metal plate 15 is integrally laminated, and the base-side metal plate 17 is integrally laminated by being fixed to the rubber-side metal plate 15 with fixing bolts 16. The metal plate 12 disposed between the pair of ultrahigh damping viscoelastic rubbers 13 and 14 is a safety device fixing metal plate, and a safety device 18 made of metal, carbon fiber resin, or the like at the end thereof. Is attached.

  In addition, in the damping devices 9 and 11 shown in FIGS. 5 and 6, a plurality of longitudinal screw rebars 19 extending in the vertical direction (stacking direction) are provided on the base side metal plates 17 arranged on both outer sides. One end is welded and integrated. Further, the longitudinal screw rebar 19 is provided with a mechanical joint 20 at an intermediate portion, and is extended by the joint 20, and a T-shaped metal member 21 is attached to the extended other end. Further, a plurality of lateral screw rebars 22 extending in the horizontal direction at intervals in the vertical direction are provided between the vertical direction from one end of the vertical screw rebar 19 extending in the vertical direction to the middle portion. It is arranged. In addition, each lateral threaded reinforcing bar 22 is provided with mechanical joints 23 at both ends, and is extended by the joints 23, and T-shaped hardware 21 is attached to the extended one end and the other end, respectively. The vertical screw rebars 19 and the horizontal screw rebars 22 are arranged between the base-side metal plate 17 and the vertical screw rebar 19 to the joint (intermediate portion) 20 between the both ends of the horizontal screw rebar 22. The portion between the pair of joints 23 in the lateral direction is buried with concrete. In the present embodiment, this embedded portion is the PC concrete portion 24. Further, a concrete portion 27 composed of a reinforcing bar 25 and cast-in-place concrete 26 is provided so as to embed each PC concrete portion 24 above and below with the ultrahigh damping viscoelastic rubbers 13 and 14 therebetween.

  The ultra-high damping viscoelastic rubbers 13 and 14 are, for example, natural rubber damping materials, and have low temperature dependency, strain dependency, and speed dependency, and exhibit high damping properties against vibration. As a result, the damping devices 9 and 11 shown in FIGS. 5 and 6 configured as described above are deformed as shown in FIGS. 7, 8, and 9, respectively. Thus, the seismic energy can be absorbed with respect to three kinds of forces of horizontal force (FIG. 7), compressive force (FIG. 8), and tensile force (FIG. 9), and excellent seismic control performance is exhibited.

  When manufacturing such vibration control devices 9 and 11, first, at a first stage shown in FIG. 10A, the safety device fixing metal plate 12 is paired with a pair of ultrahigh damping viscoelastic rubbers 13. , 14, and a rubber-side metal plate 15 is bonded to the outside of each of the ultra-high damping viscoelastic rubbers 13, 14. Next, in the second stage shown in FIG. 10B (and FIG. 10A), the longitudinal screw rebar 19 having the same length is welded to the base side metal plate 17, and the mechanical joint 20 is attached to the intermediate portion. The base-side metal plate 17 in this state is fixed to each rubber-side metal plate 15 with fixing bolts 16. Next, in the third stage shown in FIG. 10C, the horizontal screw rebars 22 are disposed and the mechanical joints 23 are installed on the respective horizontal screw rebars 22. Next, in the fourth stage shown in FIG. 10 (d), the mold frame 30 is disposed and the fixing frame 31 and the filler are inserted. In the fifth stage shown in FIG. Fix with set bolt 32. Next, in a sixth stage shown in FIG. 10 (f), concrete is placed in the mold 30 from the direction of arrow F, and the mold 30 is removed after the concrete is hardened. A vibration control device main body 33 having ultrahigh damping viscoelastic rubbers 13 and 14 is formed therebetween. And this damping device main-body part 33 employ | adopts the PC conversion method in a factory, and is manufactured with sufficient precision.

  Next, the damping device main body 33 manufactured in this way is carried into the site, and the safety device 18 is fixed to the end of the safety device fixing metal plate 12 in the seventh stage shown in FIG. Next, in the eighth stage shown in FIG. 11 (b), the screw rebars 19 and 22 with the T-shaped hardware 21 are connected to the mechanical joints 20 and 23, and the vertical screw rebar 19 and the horizontal screw rebar 22 are connected. Respectively. Then, in the ninth stage shown in FIG. 11 (c), the reinforcing bars 25 are arranged, and in the tenth stage shown in FIG. 11 (d), the mold 34, the fixed frame 31 and the filler are installed. Then, as shown in FIG. 11 (e), in the eleventh stage, the cast-in-place concrete 26 is filled into the mold 34 from the injection hole, and the mold 34 is removed after the concrete is hardened. 11 is formed (manufactured) and disposed at a predetermined position.

  Here, it is not necessary to limit the seismic control devices 9 and 11 to those configured as described above. For example, a generator that generates power in accordance with relative displacement (vibration) between the upper structure A1 and the lower structure A2. And an electromagnet that is supplied with electric power from this generator to generate a magnetic force, and as shown in FIGS. 5 and 6, an electromagnet 35 is buried in the center of the concrete portion 27, and the magnetic force generated by the electromagnet 35. You may comprise so that the seismic energy which acted on the seismic isolation building may be attenuated. In this case, an excellent horizontal displacement attenuation function is imparted to the vibration control devices 9 and 11 by the electromagnet 35 and the like.

  Next, the operation and effect of the structure for preventing overturning B of the base-isolated building of the present embodiment having the above-described configuration and the base-isolated building A including the structure will be described.

  When vibration energy acts due to an earthquake or the like and a roll occurs in the building A, the seismic isolation device 1 such as laminated rubber is deformed, so that the natural period of the upper structure A1 is, for example, from the dominant period band of seismic motion. By shifting to the long period side, the response acceleration is reduced to suppress the shaking of the upper structure A1. In this way, excellent seismic isolation performance is exhibited by the seismic isolation device 1 as in the conventional base isolation building.

  On the other hand, when vibration energy is applied to the upper structure A1 and rocking occurs, a pulling force is applied to the seismic isolation device, but in the present embodiment, the outer fall prevention structure B1 The upper structure is constituted by the outer holding part 7 and the outer fall prevention structure main body part 8 and by the upper seismic isolation device fixing member 6 and the inner fall prevention structure main body part 10 (inner holding part 10c) of the inner fall prevention structure B2. The amount of displacement of A1 in the vertical direction T2 (the amount of swing of the upper structure A1) is restricted. Further, the outer fall prevention structure main body 10 (side part 10a) of the upper seismic isolation device fixing member 6 and the inner fall prevention structure B2 is provided by the outer holding part 7 and the outer fall prevention structure main body 8 of the outer fall prevention structure B1. 10b) regulates the amount of displacement in the horizontal direction (lateral direction) T1 of the upper structure A1. That is, since the outer fall prevention structure B1 and the inner fall prevention structure B2 are provided on the outer peripheral side of the seismic isolation building A, the outer holding part 7 is moved in the vertical direction T2 and the horizontal direction T1 by the outer fall prevention structure main body 8. The upper seismic isolation device fixing member 6 is restricted from being displaced in the vertical direction T2 and the horizontal direction T1 by the inner restraining portion 10c and the side portions 10a, 10b of the inner fall prevention structure main body portion 10. The For this reason, the shaking of the upper structure A1 is suppressed to be small, the pulling force acting on the seismic isolation device 1 is suppressed to a low level, and the upper structure A1 is prevented from falling. Thus, the outer fall prevention structure B1 and the inner fall prevention structure B2 of the present embodiment can be used also as a displacement attenuating device and is economical.

  Further, at this time, the seismic isolation device is arranged in the clearance H2 in the vertical direction T2 between the outer restraining portion 7 and the outer fall prevention structure main body portion 8 and in the clearance H4 in the vertical direction T2 between the inner restraining portion 10c and the upper seismic isolation device fixing member 6. However, since the vibration control devices 9 and 11 are installed, the vibration energy acts on the upper structure A1 to cause rocking, and the vibration energy is attenuated by the vibration control devices 9 and 11. That is, the damping performance is exhibited with respect to the vibration energy that swings the upper structure A1 in the vertical and horizontal directions T1 and T2 by the vibration control devices 9 and 11. As a result, the shaking of the upper structure A1 can be suppressed more reliably, the pulling force acting on the seismic isolation device 1 can be suppressed low, and the upper structure A1 can be prevented from falling.

  Therefore, in the base-isolated building B of the present embodiment and the base-isolated building A having the same, when the vibration energy acts on the upper structure A1 and a shake occurs, By the outer holding part 7 and the outer fall prevention structure main body part 8 and by the upper seismic isolation device fixing member 6 and the inner fall prevention structure main body part 10 of the inner fall prevention structure B2, the vertical direction T2 of the upper structure A1 It becomes possible to regulate the amount of displacement in the horizontal direction T1. As a result, the swing of the upper structure A1 can be kept small while allowing the locking, the pulling force acting on the seismic isolation device 1 can be kept low, and the upper structure A1 can be prevented from overturning. Is possible.

  That is, the falling moment of the tower building A having a large aspect ratio can be processed to prevent the seismic isolation device 1 from being lifted greatly, and the base isolation building A can be prevented from falling. For this reason, it is unnecessary to construct the upper structure A1 with high rigidity and strength so that the shear deformation angle of each floor of the upper structure A1 is kept below a certain value, and the seismic isolation building A can be constructed at low cost. It becomes possible (it becomes possible to reduce the yield strength of the upper structure A1 and to provide a cheaper seismic isolation building A).

  In addition, since the upper structure A1 is prevented from falling by the inner fall prevention structure B2 together with the outer fall prevention structure B1, the design isolation degree and the aspect ratio are large compared with the conventional base isolation building. In contrast, the outer fall prevention structure B1 and the inner fall prevention structure B2 are arranged in a well-balanced manner, and it is possible to improve the safety against the fall moment, which is a weak point of the conventional seismic isolation building, and to surely prevent the fall.

  Further, the gap H2 in the vertical direction T2 between the outer holding portion 7 and the outer fall prevention structure main body portion 8 and the gap H4 in the vertical direction T2 between the inner holding portion 10c and the upper seismic isolation device fixing member 6 are not limited to the seismic isolation device. Since the seismic devices 9 and 11 are installed, vibration energy acts on the upper structure A1 to cause a vibration, and the vibration control devices 9 and 11 can attenuate the vibration energy. As a result, it is possible to effectively impart vibration energy attenuation performance, and it is possible to more reliably prevent overturning.

  As described above, the structure for preventing overturning of the base-isolated building according to the present invention and the embodiment of the base-isolated building having the structure have been described. However, the present invention is not limited to the above-described one embodiment, and departs from the spirit thereof. It is possible to change appropriately within the range not to be. For example, in the present embodiment, the outer restraint portion 7 of the outer fall prevention structure B1 and the gap H2 in the vertical direction T2 of the outer fall prevention structure main body portion 8 and the inner restraint portion 10c of the inner fall prevention structure B2 and the upper seismic isolation device are fixed. The vibration control devices 9 and 11 are respectively provided in the gap H4 in the vertical direction T2 of the member 6 so as to prevent overturning and to impart vibration energy attenuation performance. On the other hand, when the vibration control energy 9 acts on the upper structure A1 without the vibration control devices 9 and 11 being provided in the gaps H2 and H4, the outer restraining portion 7 and the outer fall prevention structure main body portion 8 are generated. And the amount of displacement of the upper structure A1 in the vertical direction T2 and the horizontal direction T1 is regulated by the upper seismic isolation device fixing member 6 and the inner fall-preventing structure main body 10 to thereby shake the upper structure A. It is also possible to suppress the fall and prevent the fall.

  In this case, since the outer structure B1 and the inner structure B2 prevent the fall of the upper structure A1 while allowing the upper structure A1 to be locked, a separate damping device is provided inside the upper structure A1. It is possible to effectively impart vibration energy attenuation performance as in this embodiment, and it is also possible to more reliably prevent overturning.

  Further, the outer restraint 7 of the outer fall prevention structure B1 and the gap H2 in the vertical direction T2 of the outer fall prevention structure main body 8 and the upper and lower of the inner restraint 10c of the inner fall prevention structure B2 and the upper seismic isolation device fixing member 6 The vibration control devices 9 and 11 may be provided in either one of the gaps H4 in the direction T2.

  In the present embodiment, the base-isolated building A has been described as being an intermediate floor base-isolated building, but the present invention may of course be applied to a basic base-isolated building. And when applying to the base seismic isolation building A, as shown, for example in FIG.12 and FIG.13, it connects with the outer side holding | suppressing part 7 and the base bottom slab 3 (lower structure A2) of the member 5 for upper base isolation device fixation. The outer fall prevention structure main body 8 having a U-shaped outer cross section constitutes the outer fall prevention structure B1, and the inner fall prevention structure main body 10 connected to the base bottom plate 3 (lower structure A2) is provided. If B2 is comprised, it is possible to obtain the same effect as this embodiment.

  Further, in the case of the intermediate floor seismic isolation building A, as shown in FIGS. 14 and 15, the beam (inner holding portion 10e) is rigidly joined to the four columns (side portion 10d) connected to the foundation bottom slab 3, and the beam 10e. And the upper seismic isolation device fixing member 6 is provided with a gap H4 (seismic control device 11) to form the inner fall prevention structure main body 10 and is provided with such an inner fall prevention structure main body 10 so as to fall inside. The prevention structure B2 may be configured. Even in this case, it is possible to obtain the same effect as that of the present embodiment.

  Moreover, in this embodiment, the inner side fall prevention structure main body part 10 of the inner side fall prevention structure B2 is provided by connecting the side parts 10a and 10b to the lower structure A2, and the upper seismic isolation device fixing member 6 and the inner holding part 10c. The gap H4 (seismic control device 11) is provided between them, but as shown in FIGS. 16 and 17, for example, the column (side portion 10f) is connected to the upper seismic isolation device fixing member 6. A beam (inner holding part 10g) is rigidly joined to this column 10f, and a gap H4 (seismic control device 11) is provided between the beam 10g and the lower seismic isolation device fixing member 5, thereby preventing the body from falling inside. The inner fall prevention structure B2 may be configured by forming the portion 10 and including the inner fall prevention structure main body 10 as described above. Even in this case, it is of course possible to obtain the same effects as those of the present embodiment.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Support pile 3 Foundation bottom plate 4 Column 5 Lower seismic isolation device fixing member 6 Upper seismic isolation device fixing member 7 Outer restraint portion 8 Outer fall prevention structure main body portion 9 Damping device 10 Inner fall prevention structure main body portion 10a side part 10b side part 10c inner side restraint part 10d side part (column)
10e Inner holding part (beam)
10f Side (pillar)
10g Inner holding part (beam)
11 Damping device 12 Metal plate 13 Ultra high damping viscoelastic rubber 14 Ultra high damping viscoelastic rubber 15 Rubber side metal plate 16 Fixing bolt 17 Base side metal plate 18 Safety device 19 Longitudinal screw rebar 20 Mechanical joint 21 T-shaped hardware 22 Lateral screw rebar 23 Mechanical joint 24 PC concrete part 25 Reinforcement 26 Cast-in-place concrete 27 Concrete part 30 Formwork 31 Fixing frame 32 Temporary fastening bolt 33 Damping device main body 34 Formwork 35 Electromagnet A Seismic isolation building A1 Upper structure A2 Lower structure B Fall prevention structure B1 Outer fall prevention structure B2 Inner fall prevention structure H1 Gap H2 Gap H3 Gap H4 Gap P Seismic isolation device installation floor T1 Horizontal direction (horizontal direction)
T2 vertical direction

Claims (2)

A structure for preventing overturning of a seismic isolation building in which a seismic isolation device is interposed between the upper structure and the lower structure,
An outer fall prevention structure disposed outside the seismic isolation building and an inner fall prevention structure disposed inside the seismic isolation building;
The outer fall-preventing structure includes an outer holding portion formed so as to extend the upper seismic isolation device fixing member of the upper structure connecting the upper end side of the seismic isolation device to the laterally outer side, and the lower structure. And an outer fall-preventing structure that extends in the vertical direction with a predetermined gap in the lateral direction with respect to the outer holding portion and that extends on the outer holding portion with a predetermined gap in the vertical direction. A main body unit, and
The inner fall-preventing structure includes a side portion extending in the vertical direction with one end connected to the upper seismic isolation device fixing member or the lower structure, and an inner side extending in the lateral direction connected to the side portion. A restraining portion, between the side portion and the lower seismic isolation device fixing member and / or the upper seismic isolation device fixing member, and between the inner restraining portion and the lower seismic isolation device fixing member. Alternatively, an inner side arranged to surround the lower seismic isolation device fixing member and / or the upper seismic isolation device fixing member with a predetermined gap between the upper seismic isolation device fixing members in the vertical direction. Consists of a fall prevention structure body ,
And a vertical gap between the outer holding portion and the outer fall prevention structure main body and / or a vertical gap between the inner holding portion and the lower seismic isolation device fixing member or the upper seismic isolation device fixing member. An end part is connected to the outer restraining part and the outer fall prevention structure main body part and / or the inner restraining part and the lower seismic isolation device fixing member or the upper seismic isolation device fixing member, and A structure to prevent a seismic isolation building from falling. It is a seismic isolation building with a seismic isolation device interposed between the upper structure and the lower structure,
A base-isolated building comprising the structure for preventing overturning of the base-isolated building according to claim 1 .

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