JP2017040059A - Exchange method of aseismic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which can safely exchange an aseismic device without changing aseismic performance.SOLUTION: In an exchange method of an aseismic device 10 which is interposed between a lower structure 1L and an upper structure 1U, a temporary aseismic device 15 which is adjusted so as to possess the same horizontal rigidity as those of an existing aseismic device 10A or a new aseismic device 10B which should be installed and a jack 16 are arranged at a periphery of the existing aseismic device 10A which should be exchanged between the lower structure 1L and the upper structure 1U (B), and the existing aseismic device 10A is removed in a state that the jack 16 is extended and the upper structure 1U is supported to the jack 16 (C). After that, the new aseismic device 10B is installed (D), the temporary aseismic device 15 and the jack 16 are removed, and the upper structure body 1U is supported to the new aseismic device 10B (E, F). By this constitution, the same aseismic performance as that of the aseismic device 10 can be secured between (C) to (E).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for replacing a seismic isolation device provided between a lower part and an upper part of a structure such as a building.

  In recent years, in order to increase the earthquake resistance of structures such as relatively high buildings, the seismic isolation device is installed between the lower structure including the foundation and the upper structure separated from the lower structure. There are increasing examples of adopting seismic isolation structures that reduce the seismic motion transmitted to. Seismic isolation devices generally have a service life equal to or greater than that of buildings, etc., but they need to be replaced when they have deteriorated due to changes in environmental conditions, or have been damaged by factors such as earthquakes or fires. There is a possibility. As a method of exchanging the seismic isolation device, a method of lifting the upper structure with a jack disposed around the seismic isolation device is known, and various devices have been proposed in this exchanging method (for example, Patent Documents 1 to 3). reference).

  When the upper structure is lifted by the jack in this way, while the upper structure is supported by the jack, even if an earthquake occurs, the seismic isolation effect is not exhibited at that location, and the entire structure is sufficiently seismically isolated. It becomes a dangerous state where the effect cannot be obtained. In order to solve this problem, there is also an invention in which a stainless plate is interposed as a sliding member between the jack and the lower structure, and the upper structure can be lifted while maintaining the seismic isolation state by the seismic isolation action of the stainless plate. Yes (see Patent Document 4).

Japanese Patent No. 3658842 Japanese Patent No. 4300128 Japanese Patent No. 4625302 JP 2008-163636 A

  However, in the invention described in Patent Document 4, the seismic isolation state is maintained because the portion lifted by the jack is movable in the horizontal direction. Performance will change. In other words, the seismic isolation device has two characteristics: horizontal rigidity (ability to restore to the original position) and vibration control (damping performance or damping force). The member cannot be used. Therefore, the seismic isolation performance of the entire building is different from the set value or expected value, and it is still in a dangerous state.

  This invention makes it a subject to provide the method which can replace | exchange a seismic isolation apparatus safely, without changing a seismic isolation performance in view of such a background.

  In order to solve such a problem, the present invention provides a method for replacing a seismic isolation device (10) interposed between a lower structure (1L) and an upper structure (1U), the lower Around the existing seismic isolation device (10A) to be replaced between the structure (1L) and the upper structure (1U), the existing seismic isolation device (10A) or a new seismic isolation device to be installed (10B) arranging the temporary seismic isolation device (15) and the jack (16) adjusted to have the same horizontal rigidity, and extending the jack (16) so that the upper structure (1U) is A step of supporting the jack (16), and after removing the existing seismic isolation device (10A) in a state where the upper structure (1U) is supported by the jack (16), the new seismic isolation device ( Step 10B) and before Temporary isolator (15) and remove the jack, a configuration and a step of supporting the superstructure of (1U) to a new isolator (10B) said.

  Here, “adjusted so as to have the same horizontal rigidity” does not mean that the values indicating the horizontal rigidity are the same value, but the values indicating the horizontal rigidity by adjusting are not the same. It means that the values are comparable (for example, ± 5%, ± 10%, ± 20%, etc.).

  According to this structure, since the upper structure is lifted using a temporary seismic isolation device and a jack adjusted to the same horizontal rigidity as the seismic isolation device to be replaced, the seismic isolation device that is also replaced during the seismic isolation device replacement work. The same horizontal rigidity (seismic isolation performance) can be secured. Therefore, the seismic isolation device can be exchanged safely.

  In the above invention, the temporary seismic isolation device (15) is disposed in series with the jack (16) between the lower structure (1L) and the upper structure (1U), and the existing It is good to set it as the structure containing the rubber bearing (17) with a damping function adjusted so that it may have the same horizontal rigidity and damping property as the seismic isolation device (10A) or the said new seismic isolation device (10B).

  According to this configuration, by using a rubber bearing whose horizontal rigidity and damping characteristics are relatively easy to adjust, the seismic isolation performance and damping performance of the temporary seismic isolation device are the same as those of the seismic isolation device that should be easily replaced. Can be adjusted. Moreover, since the rubber bearing and the jack are arranged in series between the lower structure and the upper structure, the installation space for the temporary seismic isolation device can be reduced. Therefore, it is not necessary to carry out a separate work to install a temporary seismic isolation device, and can be applied to many seismic isolation buildings.

  Moreover, in said invention, the said lower structure (1L) is the foundation part (2) of a building (1), and the said upper structure (1U) is a building (1) which has a pillar (6) and a beam (7). ) And the temporary seismic isolation device (15) is interposed between at least one of the foundation (2) and the beam (7) and the jack (16), It is good to set it as the structure further including the rolling bearing (19) which can slide only to the direction orthogonal to the extension direction of a beam.

  According to this structure, it can prevent that a twist arises in the part in which the rubber bearing of the lower structure and the upper structure was provided. That is, when the rubber bearing is deformed during an earthquake, a force (restoring force) that the rubber bearing tries to return to its original shape acts on the upper surface of the lower structure and the lower surface of the upper structure. On the other hand, in this configuration, the component of the relative displacement between the lower structure and the upper structure is absorbed by the rolling bearing in the direction perpendicular to the extending direction of the beam. It occurs only in the current direction, and the beam of the superstructure does not twist. On the other hand, when the lower structure and the upper structure are relatively displaced in the beam perpendicular direction due to the provision of the rolling bearing, the load of the upper structure is applied directly below the beam of the upper structure in the lower structure. . When the lower structure is a hierarchical part, the beam of the lower structure can be twisted by the load offset in the beam width direction. In contrast, in this configuration, since the lower structure is the foundation, the foundation beam is twisted even if the load of the upper structure is applied to the position offset in the beam width direction of the foundation beam due to relative displacement during an earthquake. Or twist is not a problem.

  In the above invention, the temporary seismic isolation device (15) is adjusted to have the same horizontal rigidity as the existing seismic isolation device (10A) or the new seismic isolation device (10B), and the lower structure (1L ) And the upper structure (1U), the rubber bearing (17) disposed in series with the jack (16), and the existing seismic isolation device (10A) in cooperation with the rubber bearing (17). ) Or the new seismic isolation device (10B) and the vibration control device (22) adjusted to have the same attenuation.

  According to this configuration, the horizontal rigidity can be adjusted by the rubber bearing, and the damping property (damping force) can be adjusted by the vibration control device. Therefore, the seismic isolation performance (horizontal rigidity and damping) of the temporary seismic isolation device can be adjusted to be the same as the seismic isolation performance of the seismic isolation device that should be easily replaced.

  In the above invention, the temporary seismic isolation device (15) is a slip interposed between at least one of the lower structure (1L) and the upper structure (1U) and the jack (16). A bearing (23) or a rolling bearing (24) is arranged at a position different from the jack (16) in plan view, and cooperates with the sliding bearing (23) or the rolling bearing (24) to provide the existing seismic isolation It is good to set it as the structure containing the rubber bearing (17) adjusted so that it may have the same horizontal rigidity and damping | damping property as an apparatus (10A) or the said new seismic isolation apparatus (10B).

  According to this configuration, the horizontal rigidity and damping of the temporary seismic isolation device can be adjusted by a combination of a sliding bearing or a rolling bearing and a rubber bearing. Therefore, the seismic isolation performance (horizontal rigidity and damping) of the temporary seismic isolation device can be adjusted to be the same as the seismic isolation performance of the seismic isolation device that should be easily replaced.

  Thus, according to the present invention, it is possible to provide a method capable of safely exchanging the seismic isolation device without changing the seismic isolation performance.

Explanatory drawing of the exchange procedure of the seismic isolation apparatus which concerns on 1st Embodiment Side view of the temporary seismic isolation device used in the method for replacing the seismic isolation device according to the second embodiment III-III sectional view in FIG. IV-IV sectional view in Fig. 2 Explanatory drawing of operation when the upper structure is relatively displaced in the direction A in FIG. 3 (cross-sectional view along VV in FIG. 3) Action diagram when the upper structure is relatively displaced in the direction A in FIG. 3 (cross-sectional view taken along line VI-VI in FIG. 3) Side view of the temporary seismic isolation device used in the method for replacing the seismic isolation device according to the third embodiment Side view of the temporary seismic isolation device used in the method for replacing the seismic isolation device according to the fourth embodiment

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<< First Embodiment >>
First, the replacement method of the seismic isolation device 10 (10A, 10B) according to the first embodiment will be described with reference to FIG. Here, an example in which the seismic isolation device 10 is applied to a reinforced concrete building (building), that is, a replacement method in the seismic isolation building 1 will be described. The structure to which the seismic isolation device 10 is applied may be a steel-framed reinforced concrete structure or a steel-framed building, or a civil engineering structure or other structure. Further, here, the seismic isolation device 10 is installed on the foundation 2 of the seismic isolation building 1, in other words, interposed between the foundation 2 and the frame 3 forming the layered portion, and below the seismic isolation device 10. An example in which the lower structure 1 </ b> L of the base isolation building 1 in the base is the foundation 2 and the upper structure 1 </ b> U of the base isolation building 1 above the base isolation device 10 is the casing 3 will be described. The seismic isolation device 10 may be interposed not only between the foundation 2 and the housing 3 but also inside the housing 3, that is, between the lower portion (lower layer portion) and the upper portion (upper layer portion) of the housing 3. Good. Hereinafter, the existing seismic isolation device 10 to be replaced (removed) is referred to as an existing seismic isolation device 10A, and the new seismic isolation device 10 to be installed is referred to as a new seismic isolation device 10B. When the two are not distinguished, they are simply referred to as the seismic isolation device 10.

  As shown in FIG. 1A, the foundation 2 has a footing 4, a foundation beam 5, and the like. A pile (not shown) may be provided below the footing 4, that is, in the ground G, and the footing 4 may be joined to the pile head. The foundation beam 5 may be a foundation plate (mat slab) having a uniform thickness on the entire surface. The housing 3 includes a column 6 and a beam 7 spanned over the column 6. The lower end portion of the column 6 is a supported portion 6A supported by the seismic isolation device 10, and has a larger cross section than the upper column main body portion 6B. The beam 7 is also joined to the supported portion 6 </ b> A of the column 6, and the floor slab on the lowermost floor is supported by the beam 7. The existing seismic isolation device 10A is interposed between the footing 4 and the supported portion 6A. More specifically, a base 8 for placing the existing seismic isolation device 10 </ b> A on the upper surface of the footing 4 is constructed, and the existing seismic isolation device 10 </ b> A is disposed on the base 8. The existing seismic isolation device 10A is fixed to the upper surface of the base 8 and fixed to the lower surface of the column 6 (supported portion 6A).

  Although not shown, the seismic isolation building 1 has a plurality of pairs of pillars 6 and footings 4 that support the pillars 6, and an existing seismic isolation device 10A is provided for each pair. The seismic isolation device 10 is a laminated rubber mold in which thin steel plates and rubber are alternately laminated. A laminated rubber portion 11 and an upper flange 12 and a lower flange 13 that are integrally provided at the upper and lower ends of the laminated rubber portion 11. It has. The seismic isolation device 10 suppresses the shaking of the housing 3 by transmitting the vertical load of the housing 3 to the foundation 2 and allowing the horizontal movement of the housing 3 and the foundation 2 during an earthquake. In addition, the seismic isolation device 10 has a laminated rubber part 11 made of a highly damped laminated rubber, or provided with a damper made of lead or the like inside the laminated rubber part 11 so that the laminated rubber part 11 has a damping property. In the case of being configured with a damping function that exhibits (generates a damping force), the vibration energy is absorbed and the shaking of the housing 3 is converged early.

  The procedure for exchanging the seismic isolation device 10 is as follows. That is, as shown in FIG. 1 (A), a new seismic isolation device 10B to be installed is prepared instead of the existing seismic isolation device 10A to be removed that is interposed between the foundation 2 and the housing 3. The new seismic isolation device 10B has the same seismic isolation performance as that of the existing seismic isolation device 10A (if the existing seismic isolation device 10A has deteriorated, the seismic isolation performance that it had initially. The same shall apply hereinafter). It may have seismic performance. Alternatively, the newly installed seismic isolation device 10B may have a higher seismic isolation performance than the existing seismic isolation device 10A. In recent years, the external force (earthquake) required in the structural design tends to increase as compared to the past. However, by increasing the seismic isolation performance of the newly installed seismic isolation device 10B, it can withstand the external force required in the current structural design. Seismic isolation performance can be secured.

  Further, as shown in FIG. 1B, the temporary seismic isolation device 15 adjusted to the same seismic isolation performance as the seismic isolation performance (horizontal rigidity and damping force) of the existing seismic isolation device 10A or the new seismic isolation device 10B; A jack 16 is prepared which is used in combination with the temporary seismic isolation device 15 and receives the load of the column 6 supported by the existing seismic isolation device 10A. The number of sets of temporary seismic isolation devices 15 and jacks 16 is preferably a plurality of sets, and more preferably the same as the number of beams 7 joined to the supported portion 6A of the pillar 6. For example, when the pillar 6 is a middle pillar disposed inside the base-isolated building 1, the pair of the temporary seismic isolation device 15 and the jack 16 may be four, and the pillar 6 is a corner of the base-isolated building 1. In the case of the corner pillars arranged in the section, the number of the temporary seismic isolation device 15 and the jack 16 may be two.

  The plurality of temporary seismic isolation devices 15 arranged around the existing seismic isolation device 10 </ b> A are configured by rubber bearings 17 in which thin steel plates and rubber are alternately laminated, like the laminated rubber portion 11 of the seismic isolation device 10. The total value of the seismic isolation performance (horizontal stiffness and damping force) is adjusted to be the same value as the seismic isolation performance (horizontal stiffness and damping force) of the existing seismic isolation device 10A. Here, “adjusted so as to be the same value” does not mean that the values are completely the same, but the same value (for example, ± 5% by adjusting) Or ± 10%, ± 20%, etc.).

  The prepared rubber bearing 17 and jack 16 are fixed to each other so as to overlap in the vertical direction, and are arranged around the existing seismic isolation device 10A to be replaced. That is, the rubber bearing 17 and the jack 16 are arranged in series between the foundation 2 and the housing 3. In the illustrated example, the rubber bearing 17 and the jack 16 are disposed between the foundation beam 5 and the beam 7 in such an arrangement that the rubber bearing 17 is located below and the jack 16 is located above. Alternatively, the rubber bearing 17 and the jack 16 may be disposed between the footing 4 and the column 6 (supported portion 6A), or between the footing 4 and the beam 7.

  The jack 16 has a vertical dimension so that the combined height of the jack 16 and the rubber bearing 17 is smaller than the gap between the foundation beam 5 and the beam 7 (vertical space) at least when the jack 16 is most contracted. A flat jack having a relatively small size is used. When the gap between the foundation beam 5 and the beam 7 is large, a height adjusting member 18 made of steel, high-strength concrete, or the like is provided between the foundation beam 5 and the beam 7 as necessary, and the height adjusting member 18 Is fixed to at least one of the upper and lower members. In the illustrated example, the rubber support 17 is placed on the height adjusting member 18 fixed to the foundation beam 5, and the jack 16 is in contact with the height adjusting member 18 fixed to the beam 7.

  Thereafter, the jack 16 is extended. Specifically, the jack 16 fixed to the foundation beam 5 is extended via the height adjusting member 18, and the rubber support 17 and the beam 7 are made continuous via the height adjusting member 18 (filling the gap). After the rubber bearing 17 is fixed to the beam 7, the jack 16 is further extended. As a result, the load on the column 6 applied to the existing seismic isolation device 10A as shown by the arrow in FIG. 1A is transferred to the jack 16 as shown by the arrow in FIG. 1B.

  Next, as shown in FIG. 1 (C), the jack 16 and the rubber bearing 17 support the load of the column 6, and at the same time, the fixing of the existing seismic isolation device 10A to the foundation 2 and the fixing to the housing 3 is released. Then, the existing seismic isolation device 10A is removed. When the existing seismic isolation device 10A is fixed to the foundation 2 or the housing 3, the seismic isolation function of the existing seismic isolation device 10A is not exhibited even when an earthquake occurs, and the rubber bearing 17 exhibits the seismic isolation function instead. It will be.

  Position where the existing seismic isolation device 10A is installed as shown in FIG. 1 (D) while maintaining the state where the rubber bearing 17 can exhibit the seismic isolation function. Install in. Specifically, the new seismic isolation device 10B is disposed between the foundation 2 and the housing 3, that is, on the pedestal 8 on the footing 4, and the new seismic isolation device 10B is fixed to the pedestal 8 and the new seismic isolation device 10B. The jack 16 is shortened until there is no gap between the column 6 and the supported portion 6A of the column 6, and the new seismic isolation device 10B is fixed to the supported portion 6A in contact with the supported portion 6A.

  After the new seismic isolation device 10B is fixed to the footing 4 and the column 6, the jack 16 is further shortened as shown in FIG. Thereby, the load of the pillar 6 which the jack 16 was supporting is replaced with the newly installed seismic isolation apparatus 10B.

  Finally, in a state where the jack 16 does not support the load of the column 6, as shown in FIG. 1 (F), the rubber support 17, the jack 16, and the height adjusting member 18 should be removed and replaced. The replacement work of the existing seismic isolation device 10A with the new seismic isolation device 10B is completed. In addition, if any fixed part of the rubber bearing 17, the jack 16, and the height adjustment member 18 which comprise the temporary seismic isolation device 15 arrange | positioned between the beam 7 and the foundation 2 is cancelled | released, the seismic isolation of the temporary seismic isolation device 15 will be carried out. The function is not exhibited, and only the newly installed seismic isolation device 10B exhibits the seismic isolation function.

  Thus, the temporary seismic isolation device 15 and the jack 16 adjusted to have the same seismic isolation performance as the existing seismic isolation device 10A or the new seismic isolation device 10B are arranged around the existing seismic isolation device 10A. By replacing the existing seismic isolation device 10A with the new seismic isolation device 10B in a state where the housing 3 is supported by the temporary seismic isolation device 15 and the jack 16, the seismic isolation device 10 is also replaced. The same seismic isolation performance as that of the seismic isolation device 10 can be ensured. Therefore, the seismic isolation device 10 can be replaced in a state where the safety of the seismic isolation building 1 is ensured.

  Moreover, in this embodiment, the temporary seismic isolation device 15 is arrange | positioned in series with the jack 16 between the foundation 2 and the housing 3, and the same seismic isolation performance and damping property as the existing seismic isolation device 10A or the newly installed seismic isolation device 10B. By including the rubber bearing 17 with a vibration control function adjusted so as to have the horizontal rigidity and damping of the temporary seismic isolation device 15 can be adjusted in the same manner as the seismic isolation device 10 to be replaced relatively easily. . Further, since the temporary seismic isolation device 15 and the jack 16 are arranged in series between the foundation 2 and the housing 3, the installation space for the temporary seismic isolation device 15 can be reduced. For this reason, it is not necessary to perform separate work for installing the temporary seismic isolation device 15, and the present invention can be applied to many seismic isolation buildings 1.

<< Second Embodiment >>
Next, with reference to FIGS. 2-6, the replacement | exchange method of the seismic isolation apparatus 10 which concerns on 2nd Embodiment is demonstrated. In addition, the same code | symbol is attached | subjected to the element which is the same or the same as that of 1st Embodiment, or a function, and the overlapping description is abbreviate | omitted. The same applies to the following embodiments.

  FIG. 2 corresponds to (C) in FIG. 1 and shows a state where the jack 16 and the temporary seismic isolation device 15 support the load of the column 6 and the existing seismic isolation device 10A is removed. As shown in FIG. 2, in the present embodiment, the temporary seismic isolation device 15 is provided below the rubber bearing 17 in addition to the rubber bearing 17 with a vibration control function interposed between the foundation 2 and the jack 16. It has a rolling bearing 19 which is arranged, ie interposed between the foundation 2 and the jack 16.

  As shown in FIG. 3, the rolling bearing 19 is provided with a linear rail 20 provided in a direction (arrow direction in FIG. 3) perpendicular to the extending direction of the foundation beam 5 and the beam 7 extending in parallel to each other. And a linear block 21 provided with a rolling bearing and slidably engaged with the linear rail 20. That is, the rolling bearing 19 can slide only in a direction orthogonal to the extending direction of the beam 7 (relative displacement between the linear rail 20 and the linear block 21).

  The linear rail 20 is disposed on the foundation beam 5 and fixed to the foundation beam 5. A lower end flange of the rubber bearing 17 is fixed to the upper surface of the linear block 21. As shown in FIG. 4, the upper end flange of the rubber bearing 17 is fixed to the beam 7 via a jack 16 (FIG. 2). Therefore, as shown in FIG. 5, the relative displacement when the base beam 5 and the beam 7 of the portion where the rubber bearing 17 and the rolling bearing 19 are installed is relatively displaced in the direction perpendicular to the extending direction thereof, Allowed by sliding of the rolling bearing 19. On the other hand, as shown in FIG. 6, the relative displacement when the base beam 5 and the beam 7 of the portion where the rubber bearing 17 and the rolling bearing 19 are installed is relatively displaced in the extending direction thereof is as follows. Allowed by deformation.

  For example, when the foundation 2 moves in a direction perpendicular to the extending direction of the beam 7 as shown in FIG. 5 with respect to the frame 3 at the time of an earthquake, the rubber bearing 17 is deformed only by sliding the rolling bearing 19. If the foundation 2 moves in the extending direction of the beam 7 as shown in FIG. 6 with respect to the housing 3, only the rubber bearing 17 is deformed and the rolling bearing 19 does not slide. When the movement in the combined direction of the extending direction of the beam 7 and the direction perpendicular thereto occurs, the rolling bearing 19 slides and the rubber bearing 17 is deformed.

  Even if the temporary seismic isolation device 15 is configured in this way, the seismic isolation device 10 can be replaced in a state in which the safety of the seismic isolation building 1 is ensured as in the first embodiment. In addition, the temporary seismic isolation device 15 includes the rubber bearing 17 with a vibration control function adjusted to have the same seismic isolation performance and attenuation as the existing seismic isolation device 10A or the new seismic isolation device 10B. The same effect as the form can be obtained.

  By the way, when the rubber bearing 17 is deformed, the restoring force of the rubber bearing 17 that attempts to return to the original shape acts on the upper surface of the foundation beam 5 and the lower surface of the beam 7. This restoring force can be a moment because the action line is offset from the center of gravity of the beam 7, and the beam 7 can be twisted. In the present embodiment, as shown in FIG. 5, the component in the direction orthogonal to the extending direction of the beam 7 out of the relative displacement between the foundation 2 and the housing 3 is absorbed by the rolling bearing 19, so that the rubber bearing 17 Is not deformed in a direction perpendicular to the extending direction of the beam 7. Therefore, the restoring force of the rubber bearing 17 is generated only in the extending direction of the beam 7 shown in FIG. 6, and the beam 7 is not twisted.

  On the other hand, since the rolling support 19 is provided, the load of the frame 3 that is relatively displaced in the direction orthogonal to the extending direction of the beam 7 with respect to the foundation 2 shown in FIG. Will join. When the lower end portion of the lower structure 1L is the lower layer portion of the seismic isolation building 1, the offset load can cause a twist in the beam 7 of the lower layer portion. On the other hand, in this embodiment, since the lower structure 1L is the foundation 2, the housing 3 is located at a position offset in the beam width direction from the center of gravity of the foundation beam 5 due to the relative displacement between the foundation 2 and the chassis 3 during an earthquake. Even if a load is applied, the foundation beam 5 is not twisted or twisted is not a problem.

«Third embodiment»
Next, a method for replacing the seismic isolation device 10 according to the third embodiment will be described with reference to FIG.

  In the present embodiment, the temporary seismic isolation device 15 includes the rubber support 17 and the jack 16 that are arranged in series so as to overlap vertically between the foundation beam 5 and the beam 7, and in addition, the foundation beam 5 and the beam 7. And a vibration control device 22 provided to connect the two. The rubber bearing 17 is a laminated rubber mold in which thin steel plates and rubber are alternately laminated, and is adjusted to have the same horizontal rigidity as that of the existing seismic isolation device 10A or the new seismic isolation device 10B. On the other hand, the rubber bearing 17 of the present embodiment does not exhibit a damping property (that is, a natural rubber-based laminated rubber is used) or exhibits a damping property but lacks a damping force (that is, a high-damping laminated rubber is used). Alternatively, a damper made of lead or the like is provided inside). The vibration damping device 22 exhibits a damping property instead of the rubber bearing 17 or for the shortage.

  The damping device 22 may be constituted by a damper made of lead or the like (the damping device 22 on the right side in the drawing) as shown in the figure, and a damper (a damping device on the left side in the drawing) using a U-shaped steel rod. It may be constituted by a vibration device 22). Moreover, you may use the damper using the shear resistance of the viscous fluid enclosed in the case. The vibration damping device 22 is adjusted so as to exhibit the same damping force as the damping force of the existing seismic isolation device 10A or the new seismic isolation device 10B in cooperation with the rubber bearing 17. Here, “cooperating with the rubber bearing 17” means that the sum of the damping force of the rubber bearing 17 is used as a reference, and when the rubber bearing 17 does not exhibit a damping property, a single damping force. Including the reference.

  Even if the temporary seismic isolation device 15 is configured in this way, the seismic isolation device 10 can be replaced in a state in which the safety of the seismic isolation building 1 is ensured as in the first embodiment. Further, since the temporary seismic isolation device 15 includes the vibration damping device 22 in addition to the rubber bearing 17, the horizontal rigidity can be adjusted by the rubber bearing 17 and the damping force can be adjusted by the vibration damping device 22. The seismic isolation performance (horizontal rigidity and attenuation) of the seismic isolation device 15 can be adjusted to be the same as the seismic isolation performance of the seismic isolation device 10 that should be easily replaced.

<< Fourth Embodiment >>
Finally, with reference to FIG. 8, the replacement | exchange method of the seismic isolation apparatus 10 which concerns on 4th Embodiment is demonstrated.

  In the present embodiment, the temporary seismic isolation device 15 is a combination of a jack 16 and a sliding bearing 23 arranged in series so as to overlap vertically between the foundation beam 5 and the beam 7 or a jack 16 and a rolling bearing 24. And a combination of The sliding bearing 23 and the rolling bearing 24 may be disposed below or above the corresponding jack 16. In the illustrated example, in the temporary seismic isolation device 15 on the right side, the sliding bearing 23 is disposed below the jack 16 (between the jack 16 and the foundation beam 5), and in the temporary seismic isolation device 15 on the left side, the rolling bearing 24 is jacked. 16 (between the jack 16 and the beam 7).

  The temporary seismic isolation device 15 further includes two rubber bearings 17 and 17 arranged in series so as to overlap in the vertical direction between the foundation beam 5 and the beam 7 at a position different from the jack 16 in plan view. Yes. The rubber bearings 17 and 17 arranged in series cooperate with the corresponding sliding bearing 23 or rolling bearing 24, and the sum of their seismic isolation performance (horizontal rigidity and damping force) is the same as in the first embodiment. The seismic isolation performance of the existing seismic isolation device 10A or the new seismic isolation device 10B is adjusted to be the same value.

  Even if the temporary seismic isolation device 15 is configured in this way, the seismic isolation device 10 can be replaced in a state in which the safety of the seismic isolation building 1 is ensured as in the first embodiment. In addition, the temporary seismic isolation device 15 includes a sliding bearing 23 or a rolling bearing 24 interposed between at least one of the foundation 2 and the housing 3 and the jack 16, and the seismic isolation performance (horizontal rigidity and By providing the rubber bearing 17 adjusted to the same value as the damping force), the horizontal rigidity and the damping property of the temporary seismic isolation device 15 are adjusted by the combination of the sliding bearing 23 or the rolling bearing 24 and the rubber bearing 17. can do. Therefore, the seismic isolation performance (horizontal rigidity and attenuation) of the temporary seismic isolation device 15 can be adjusted to be the same as the seismic isolation performance of the seismic isolation device 10 that should be easily replaced.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. In addition, the specific configuration, arrangement, quantity, material, procedure, and the like of each member and part can be changed as appropriate without departing from the spirit of the present invention. In addition, the components shown in the above embodiment may be combined as appropriate. On the other hand, not all the constituent elements shown in the above embodiment are necessarily essential, and can be appropriately selected.

1 Base-isolated building 1L Lower structure 1U Upper structure 2 Foundation (foundation)
3 frame (hierarchy)
5 Base Beam 6 Column 7 Beam 10 Seismic Isolation Device 10A Existing Seismic Isolation Device 10B New Seismic Isolation Device 15 Temporary Seismic Isolation Device 16 Jack 17 Rubber Bearing 19 Rolling Bearing 22 Damping Device 23 Sliding Bearing 24 Rolling Bearing

Claims (5)

A method of replacing a seismic isolation device interposed between a lower structure and an upper structure,
It is adjusted around the existing seismic isolation device to be replaced between the lower structure and the upper structure so as to have the same horizontal rigidity as the existing seismic isolation device or a new seismic isolation device to be installed. Placing a temporary seismic isolation device and jack;
Extending the jack to support the upper structure on the jack;
Installing the new seismic isolation device after removing the existing seismic isolation device with the upper structure supported by the jack; and
A step of removing the temporary seismic isolation device and the jack and supporting the upper structure on the new seismic isolation device.   The temporary seismic isolation device is disposed in series with the jack between the lower structure and the upper structure, and has the same horizontal rigidity and attenuation as the existing seismic isolation device or the new seismic isolation device. The method for replacing a seismic isolation device according to claim 1, further comprising a rubber bearing with a vibration damping function adjusted as described above. The lower structure is a foundation of a building, and the upper structure is a building hierarchy having columns and beams;
The temporary seismic isolation device further includes a rolling bearing that is interposed between at least one of the foundation and the beam and the jack and is slidable only in a direction orthogonal to the extending direction of the beam. The method for replacing a seismic isolation device according to claim 1 or 2, characterized in that it is characterized in that The temporary seismic isolation device is
A rubber bearing that is adjusted to the same horizontal rigidity as the existing seismic isolation device or the new seismic isolation device, and is arranged in series with the jack between the lower structure and the upper structure,
2. The vibration-isolating device according to claim 1, further comprising a vibration damping device adjusted to have the same attenuation as the existing seismic isolation device or the new seismic isolation device in cooperation with the rubber bearing. How to replace the seismic device. The temporary seismic isolation device is
A sliding bearing or a rolling bearing interposed between at least one of the lower structure and the upper structure and the jack;
It is arranged at a position different from the jack in plan view, and is adjusted to have the same horizontal rigidity and damping as the existing seismic isolation device or the new seismic isolation device in cooperation with the sliding bearing or the rolling bearing. The method for replacing a seismic isolation device according to claim 1, further comprising a rubber bearing.

Images