JP2016166502A - Slide bearing and base isolation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide bearing and a base isolation system that mitigate an impact load to a building structure after being lifted by a seismic ground motion, and enable a structure for mitigating the impact load to the building structure to be designed without being restricted by acting force in a static state without a seismic ground motion.SOLUTION: A slide bearing includes: a lower slide member 11 fixed on a top surface of a substructure 2; an upper slide member 12 disposed on the lower slide member 11, to allow relative sliding with regard to the lower slide member 11; a lower fixing member 14 disposed above the upper slide member 12 and having the upper slide member 12 fixed thereon; an upper fixing member 15 having an undersurface in contact with a top surface of the lower fixing member 14 and an upper edge part fixed on a superstructure 4; a housing part 25 formed between the lower fixing member 14 and the upper fixing member 15; and a cushioning member 30 disposed in the housing part 25, for mitigating with restoring force an impact when the superstructure 4 comes in contact after being lifted.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seismic isolation system applied to a structure such as a device or a building, and a sliding bearing constituting the seismic isolation system.

  One way to improve the seismic performance of structures such as equipment and buildings is to apply seismic isolation structures. In the seismic isolation structure, by installing the target structure on the seismic isolation device, the seismic isolation device deforms or displaces during the earthquake and absorbs energy, reducing the seismic load input to the target structure. . The seismic isolation device has a supporting performance for supporting the structure to be seismically isolated, a damping performance for absorbing energy at the time of the earthquake, and a restoring performance for returning to the original position with respect to a displacement caused by the earthquake. Examples of the seismic isolation device include lead plug-containing laminated rubber, sliding bearings, linear motion rolling bearings, oil dampers, steel dampers, coil springs, and the like. Various types of seismic isolation structures including combinations of these seismic isolation devices have been proposed and applied in practice.

  For structures with seismic isolation structure, especially structures with a large aspect ratio (height / width) representing the ratio of the height and width of the structure, if horizontal ground motion is input, the structure will fall There may be a rocking behavior in which an object rotates in a vertical plane. In this case, since the structure responds in the vertical direction in addition to the horizontal direction, a tensile force or a compressive force acts on the seismic isolation device.

  As a base-isolated structure corresponding to rocking behavior, for example, a laminated rubber is installed in a site where tensile force is not generated due to rocking behavior during an earthquake, and a structure accompanying rocking behavior is generated in a region where tensile force is generated due to rocking behavior during an earthquake. There has been proposed one that installs a sliding bearing having a structure that allows the object to be lifted and absorbs / relaxes the shock when the lifted structure is restored (see Patent Document 1). This sliding bearing is provided with a sliding member and a mating member that can be separated in the vertical direction, and at least one of the sliding material and the mating member is provided with an elastic member that absorbs and relieves shocks when the lifted structure is restored. It is.

JP 2001-329716 A

  For structures that require high seismic safety, it is desirable for seismic safety to reduce the seismic response of the structure as much as possible even when earthquake motion exceeding the design study level is input. In particular, in the plant facility, it is necessary to reduce the seismic load input to the building even when excessive earthquake motion is input from the viewpoint of preventing damage to the equipment in the building.

  In the seismic isolation structure described in Patent Document 1, the sliding behavior of the sliding bearing and the mating member are separated from each other and the structure is allowed to lift against the rocking behavior caused by excessive seismic motion input. It prevents the seismic isolation structure from being damaged due to the tensile force caused by the behavior. Furthermore, the impact to the structure input at the time of restoration after the structure is lifted is absorbed and alleviated by the elastic member of the sliding support. However, since this elastic member is installed so as to support the structure in a stationary state where earthquake motion does not act, in the design of the elastic member, not only the fluctuating load at the time of the earthquake but also the load supporting the weight of the structure, etc. It is necessary to consider the acting force in a stationary state, and it is necessary to consider a plurality of conditions.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to make it possible to reduce the impact load applied to the structure when the structure is lifted by contact due to the input of earthquake motion. Another object of the present invention is to provide a sliding bearing and a seismic isolation system that can design a structure that reduces the impact load on a structure without being restricted by an acting force in a stationary state where no seismic motion acts.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  The present application includes a plurality of means for solving the above-described problems. For example, a sliding bearing installed between the lower structure and the upper structure of the structure, A lower sliding member fixed to the upper sliding member, disposed on the lower sliding member, and slidable relative to the lower sliding member, and disposed on the upper side of the upper sliding member, A lower fixing member to which the upper sliding member is fixed; an upper fixing member whose lower surface is in contact with the upper surface of the lower fixing member and whose upper end is fixed to the upper structure; the lower fixing member; An accommodation part formed between the upper fixing member and a buffer member arranged in the accommodation part and relieving an impact at the time of contact after the upper structure is lifted by a restoring force .

According to the present invention, the cushioning member having a restoring force in the accommodating portion formed between the lower fixing member and the upper fixing member in a state where the lower surface of the upper fixing member is in contact with the upper surface of the lower fixing member. By accommodating it, the acting force such as the supporting load of the weight of the upper structure in the stationary state without the input of ground motion is prevented from acting on the buffer member, so at the time of contact after the upper structure lifts due to the input of ground motion The shock load to the input superstructure can be reduced by the buffer member, and the buffer member can be designed without being restricted by the acting force in the stationary state.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a schematic longitudinal cross-sectional view which shows the seismic isolation building which employ | adopted 1st Embodiment of the sliding bearing and seismic isolation system of this invention. It is the cross-sectional view which looked at the base isolation building which employ | adopted 1st Embodiment of the sliding bearing and base isolation system of this invention shown in FIG. 1 from the II-II arrow. It is a longitudinal section showing a 1st embodiment of a slide bearing of the present invention. It is the cross-sectional view which looked at 1st Embodiment of the sliding support of this invention shown in FIG. 3 from the IV-IV arrow. It is explanatory drawing which shows the state at the time of the input of the horizontal ground motion in the seismic isolation building which employ | adopted 1st Embodiment of the sliding support and seismic isolation system of this invention shown in FIG. It is explanatory drawing which shows the state at the time of the input of the excessive earthquake motion in the seismic isolation building which employ | adopted 1st Embodiment of the sliding support and seismic isolation system of this invention shown in FIG. It is explanatory drawing which shows the lift state at the time of the input of the excessive earthquake motion in 1st Embodiment of the sliding bearing of this invention shown in FIG. It is explanatory drawing which shows the state at the time of the contact after the lift in 1st Embodiment of the sliding support of this invention shown in FIG. It is a longitudinal cross-sectional view which shows the modification of 1st Embodiment of the sliding bearing of this invention. It is explanatory drawing which shows the lift state at the time of the input of the excessive earthquake motion in the modification of 1st Embodiment of the sliding bearing of this invention shown in FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the sliding bearing of this invention. It is a top view which shows the ring for a buffer which comprises a part of 2nd Embodiment of the sliding support of this invention shown in FIG. It is explanatory drawing which shows the lift state at the time of the input of the excessive earthquake motion in 2nd Embodiment of the sliding bearing of this invention shown in FIG. It is a longitudinal cross-sectional view which shows an example of the modification of 2nd Embodiment of the sliding bearing of this invention. It is a longitudinal cross-sectional view which shows the other example of the modification of 2nd Embodiment of the sliding bearing of this invention.

Hereinafter, embodiments of the sliding support and seismic isolation system of the present invention will be described with reference to the drawings.
[First Embodiment]
The structure of the base isolation building which employ | adopted 1st Embodiment of the sliding bearing and base isolation system of this invention is demonstrated using FIG.1 and FIG.2. FIG. 1 is a schematic longitudinal sectional view showing a seismic isolation building adopting the first embodiment of the sliding support and seismic isolation system of the present invention, and FIG. 2 is a first view of the sliding support and seismic isolation system of the present invention shown in FIG. It is the cross-sectional view which looked at the base isolation building which employ | adopted 1 embodiment from the II-II arrow.

  In FIG. 1, the seismic isolation building 1 includes a lower base plate 2 as a lower structure, a base isolation layer 3 as a base isolation system installed on the lower base plate 2, and an upper portion supported by the base isolation layer 3. It has an upper building 4 as a structure. The seismic isolation layer 3 is interposed between the lower foundation plate 2 and the upper building 4 to reduce the seismic motion load input to the upper building 4. The seismic isolation layer 3 includes, for example, a plurality of laminated rubber bearings 5 and a plurality of sliding bearings 10 which are seismic isolation devices. As shown in FIG. 2, the sliding base 10 is arranged on the outer peripheral side of the lower base plate 2, and the laminated rubber bearing 5 is arranged on the inner side thereof, as shown in FIG.

  As shown in FIG. 1, the laminated rubber support 5 includes a columnar laminated rubber 6 in which thin steel plates (not shown) and thin rubber sheets (not shown) are alternately laminated and integrated, and a bottom surface of the laminated rubber 6. And a lower flange 7 and an upper flange 8 provided on the upper surface, respectively. The laminated rubber support 5 is attached to the lower base plate 2 and the upper building 4 by a lower flange 7 and an upper flange 8.

Next, a detailed configuration of the first embodiment of the sliding bearing according to the present invention will be described with reference to FIGS.
3 is a longitudinal sectional view showing the first embodiment of the sliding bearing of the present invention, and FIG. 4 is a cross-sectional view of the first embodiment of the sliding bearing of the present invention shown in FIG. FIG. 3 and 4, the same reference numerals as those shown in FIG. 1 and FIG. 2 are the same parts, and detailed description thereof will be omitted.

  3 and 4, the sliding support 10 is disposed on the lower sliding member 11 fixed on the lower base plate 2 and the lower sliding member 11, and slides relative to the lower sliding member 11. A movable upper sliding member 12 and a fixing member 13 that is disposed above the upper sliding member 12 and transmits the load of the upper building 4 to the lower sliding member 11 and the upper sliding member 12 are provided. The lower sliding member 11 is, for example, a steel plate having a surface coated with a fluorine resin or the like. The upper sliding member 12 is a member formed using, for example, tetrafluoroethylene resin (PTFE) or polyamide resin as a main ingredient. The upper and lower arrangements of the lower sliding member 11 and the upper sliding member 12 can be exchanged.

  The fixing member 13 is disposed on the upper side of the upper sliding member 12, and has a substantially cylindrical lower fixing member 14 to which the upper sliding member 12 is fixed, a lower surface abutting on an upper surface of the lower fixing member 14, and an upper end portion. It is comprised with the substantially cylindrical upper side fixing member 15 fixed to the upper building 4. As shown in FIG. A concave portion 16 is provided at a substantially central portion of the upper surface of the lower fixing member 14. A protrusion 17 that smoothly fits into the recess 16 of the lower fixing member 14 is provided at a substantially central portion of the lower surface of the upper fixing member 15. A substantially annular housing groove 18 is provided outside the protrusion 17 on the lower surface of the upper fixing member 15. The upper fixing member 15 cannot move relative to the lower fixing member 14 in the horizontal direction because the protrusion 17 is fitted into the recess 16 of the lower fixing member 14. Further, the upper fixing member 15 can be separated upward from the lower fixing member 14.

  A housing portion 25 is formed by the housing groove portion 18 of the upper fixing member 15 and the upper surface of the lower fixing member 14 that closes the opening of the housing groove portion 18. That is, the accommodating portion 25 is formed between the lower fixing member 14 and the upper fixing member 15. The housing portion 25 accommodates the substantially annular elastic body 30 in a state compressed in the vertical direction. The elastic body 30 has a restoring force, and is formed in a size that partially protrudes from the housing groove 18 in a state where no force is applied. As will be described in detail later, the elastic body 30 has an upper fixing member 15 and a lower fixing member 14 that are generated after the upper building 4 is lifted (separated upward from the lower fixing member 14 of the upper fixing member 15). It functions as a cushioning member that relieves the impact caused by the contact by the restoring force (reaction force).

  Next, the operation of the sliding bearing and seismic isolation system according to the first embodiment of the present invention will be described with reference to FIGS. 3 and 5 to 8.

  FIG. 5 is an explanatory diagram showing a state when a horizontal ground motion is input in the seismic isolation building adopting the first embodiment of the sliding bearing and seismic isolation system of the present invention shown in FIG. 1, and FIG. FIG. 7 is an explanatory diagram showing a state when an excessive earthquake motion is input in the seismic isolation building adopting the first embodiment of the sliding bearing and seismic isolation system of the present invention shown in FIG. 7, and FIG. 7 is a diagram of the sliding bearing of the present invention shown in FIG. FIG. 8 is an explanatory view showing a lifted state when an excessive earthquake motion is input in the first embodiment, and FIG. 8 is a state at the time of contact after the lift in the first embodiment of the sliding bearing of the present invention shown in FIG. It is explanatory drawing which shows. 5 to 8, the same reference numerals as those shown in FIGS. 1 to 4 are the same parts, and detailed description thereof is omitted.

  In the stationary state where no seismic force is applied, as shown in FIG. 3, the sliding bearing 10 supports the upper building 4, so that a compressive load acts on the sliding bearing 10 in the vertical direction. The sliding support 10 is configured such that the lower surface of the upper fixing member 15 is brought into contact with the upper surface of the lower fixing member 14 by accommodating the entire elastic body 30 in the accommodating portion 25 in a state compressed in the vertical direction. Therefore, the compressive load in the vertical direction is directly transmitted from the upper fixing member 15 to the lower fixing member 14 without passing through the elastic body 30. This compressive load is further transmitted to the upper sliding member 12 fixed to the lower fixing member 14 and the lower sliding member 11 in contact with the upper sliding member 12.

  In this way, in a stationary state where the vertical compressive load acts on the sliding bearing 10, the vertical compressive load is elastically caused by bringing the lower surface of the upper fixing member 15 and the upper surface of the lower fixing member 14 into contact with each other. It can be transmitted to the upper sliding member 12 and the lower sliding member 11 without passing through the body 30. For this reason, the high rigidity of the vertical direction of the sliding bearing 10 is securable. Therefore, the supporting load per one sliding bearing can be increased as compared with a sliding bearing having a conventional structure in which a vertical compressive load is supported by an elastic member. As a result, the number of sliding supports 10 and laminated rubber supports 5 used in the seismic isolation system can be reduced. Further, since the compressive load in the vertical direction is transmitted to the upper sliding member 12 and the lower sliding member 11 without passing through the elastic body 30, the upper building 4 in a stationary state is considered in the acting force such as the support load. Without this, the elastic body 30 can be designed.

  Next, as shown in FIG. 5, when horizontal and vertical ground motion within a certain range acts on the seismic isolation building 1, the displacement of the upper building 4 due to the ground motion input from the lower base plate 2 On the other hand, the laminated rubber bearing 5 is deformed and the sliding bearing 10 is displaced. The seismic isolation layer 3 consumes input energy due to the deformation of the laminated rubber bearing 5 and the displacement of the sliding bearing 10 in response to the input of ground motion, so that the seismic load transmitted to the upper building 4 can be reduced. As a result, the response of the upper building 4 is reduced.

  Specifically, in the sliding bearing 10 shown in FIG. 3, since the protrusion 17 of the upper fixing member 15 is fitted in the recess 16 of the lower fixing member 14, the upper fixing member against horizontal earthquake motion. 15 does not slide relative to the lower fixing member 14. For this reason, with the relative horizontal displacement of the upper building 4 with respect to the lower foundation plate 2, the lower fixing member 14 and the upper fixing member 15 are integrally displaced in the horizontal direction, whereby the upper sliding member 12 is displaced. Slide on the lower sliding member 11. At this time, a frictional force is obtained as a product of the coefficient of friction between the upper surface (sliding surface) of the lower sliding member 11 and the lower surface (sliding surface) of the upper sliding member 12 and the support load of the sliding bearing 10. This frictional force resists the earthquake load, so that the response of the upper building 4 is reduced. Further, in the laminated rubber support 5 shown in FIG. 5, a restoring force is generated in which the deformation of the laminated rubber 6 is restored, and the upper building 4 is returned to the original position by the restoring force.

  Next, when excessive earthquake motion acts, as shown in FIG. 6, the laminated rubber bearing 5 is greatly deformed and the sliding bearing 10 is largely displaced, and the locking behavior of the upper building 4 occurs. For this reason, one edge part of the upper building 4 floats, and the vertical displacement of the seismic isolation layer 3 edge part increases more than the case where it shows in FIG. For this reason, as shown in FIG. 7, the upper fixing member 15 of the sliding bearing 10 is separated upward with respect to the lower fixing member 14, and a space is generated between the upper fixing member 15 and the lower fixing member 14. . As a result, the constraint condition of the elastic body 30 changes from full surface constraint to lower end free constraint. For this reason, a part of the elastic body 30 protrudes downward from the accommodation groove portion 18 of the upper fixing member 15 due to the restoring force.

  After that, as shown in FIG. 8, the upper fixing member 15 comes into contact with the lower fixing member 14 again due to the weight of the upper building 4 or the reverse locking behavior. At the time of this re-contact, the elastic body 30 is in a state where a part of the elastic body 30 protrudes downward from the housing groove portion 18, and is compressed between the upper surface of the lower fixing member 14 and the housing groove portion 18 of the upper fixing member 15. The The reaction force (restoring force) generated by the compression deformation of the elastic body 30 reduces the impact caused by the contact between the upper fixing member 15 and the lower fixing member 14. That is, the impact load input to the upper building 4 is reduced.

  In the present embodiment, as shown in FIGS. 7 and 8, the upper building 4 is lifted by adopting a structure in which the protrusions 17 of the upper fixing member 15 are fitted into the recesses 16 of the lower fixing member 14. In this case, it is possible to prevent the upper fixing member 15 from falling off the lower fixing member 14. For this reason, the upper fixing member 15 can return to the original position before the upper building 4 is lifted with respect to the lower fixing member 14.

  Moreover, in this Embodiment, as shown in FIG. 6, the edge part of the seismic isolation layer 3 at the time of the lift by the rocking behavior of the upper building 4 is arrange | positioned inside by arrange | positioning the laminated rubber bearing 5 weak to a tensile force. The excessive displacement in the vertical direction is prevented from occurring in the laminated rubber bearing 5. For this reason, it is possible to suppress damage to the laminated rubber 6.

  According to the above-described first embodiment of the sliding support and seismic isolation system of the present invention, the lower fixing member 14 and the lower fixing member 14 are in contact with the lower surface of the upper fixing member 15 in contact with the upper surface of the lower fixing member 14. The weight of the upper building (upper structure) 4 in a stationary state without the input of earthquake motion by accommodating the elastic body (buffer member) 30 having restoring force in the accommodating portion 25 formed between the upper fixing member 15 and The upper building (upper structure) that is input when the upper building (upper structure) 4 is lifted by the input of the seismic motion is prevented from acting on the elastic body (buffer member) 30. ) The impact load on 4 can be reduced by the elastic body (buffer member) 30, and the elastic body (buffer member) 30 can be designed without being restricted by the acting force in a stationary state.

[Modification of First Embodiment]
Next, a modification of the first embodiment of the sliding bearing and seismic isolation system of the present invention will be described with reference to FIGS.
FIG. 9 is a longitudinal sectional view showing a modification of the first embodiment of the sliding bearing of the present invention, and FIG. 10 is an excessive earthquake motion in the modification of the first embodiment of the sliding bearing of the present invention shown in FIG. It is explanatory drawing which shows the floating state at the time of input. 9 and 10, the same reference numerals as those shown in FIG. 1 to FIG. 8 are the same parts, and detailed description thereof will be omitted.

  1st Embodiment accommodates the elastic body 30 as a buffer member in the accommodating part 25 in a compression state. On the other hand, the modification of the first embodiment of the sliding bearing of the present invention shown in FIG. 9 uses an elastic-plastic body 30A as a buffer member, and the lower end portion and the upper end portion of the elastic-plastic body 30A are respectively set on the lower side. The elastic-plastic body 30 </ b> A is accommodated in the accommodating portion 25 in a state of being fixed to the fixing member 14 and the upper fixing member 15. That is, it is not necessary to accommodate the elastic-plastic body 30A in the accommodating portion 25 in a compressed state.

  When excessive earthquake motion is applied, the lower end and upper end of the elastic-plastic body 30A are fixed to the lower fixing member 14 and the upper fixing member 15, respectively, as shown in FIG. The elastic-plastic body 30 </ b> A is stretched along with the upward separation from the lower fixing member 14 by the upper fixing member 15. Thereafter, the elastic-plastic body 30 </ b> A is crushed when the upper fixing member 15 and the lower fixing member 14 are recontacted. As described above, when the upper building 4 is lifted, the elastic-plastic body 30A can be forcibly deformed, thereby attenuating the impact generated when the upper fixing member 15 and the lower fixing member 14 come into contact again. be able to.

  According to the above-described modification of the first embodiment of the sliding bearing and seismic isolation system of the present invention, the same effects as those of the first embodiment can be obtained.

  Further, according to the present embodiment, since the impact after the upper building 4 is lifted is mitigated by the elastic-plastic deformation of the elastic-plastic body 30A, the cushion of the sliding support 10A is more than that when the elastic body 30 is used as the buffer member. Performance is improved.

[Second Embodiment]
Next, a second embodiment of the sliding support and seismic isolation system of the present invention will be described with reference to FIGS.
FIG. 11 is a longitudinal sectional view showing a second embodiment of the sliding support of the present invention, and FIG. 12 shows a buffer ring constituting a part of the second embodiment of the sliding support of the present invention shown in FIG. FIG. 13 is an explanatory view showing a floating state when an excessive earthquake motion is input in the second embodiment of the sliding bearing of the present invention shown in FIG. 11 to 13, the same reference numerals as those shown in FIGS. 1 to 10 are the same parts, and detailed description thereof is omitted.

  In the first embodiment, the accommodating portion 25 formed by the accommodating groove portion 18 provided on the lower surface of the upper fixing member 15 and the upper surface of the lower fixing member 14 that closes the opening of the accommodating groove portion 18 is elastic as a buffer member. The body 30 is accommodated in a compressed state. On the other hand, in the second embodiment of the sliding bearing of the present invention shown in FIG. 11, a buffer ring 30B as a buffer member is formed on the outer peripheral portion of the upper surface of the lower fixing member 14B and the lower surface of the upper fixing member 15B. It accommodates in the annular | circular shaped accommodating part 25B.

  Specifically, a first conical surface 19 is formed on the outer peripheral portion of the upper surface of the lower fixing member 14B. A second conical surface 20 is formed on the outer periphery of the lower surface of the upper fixing member 15B. A substantially annular storage portion 25B is formed by the first conical surface 19 of the lower fixing member 14B and the second conical surface 20 of the upper fixing member 15B.

  A buffering ring 30B is accommodated in the accommodating portion 25B. For example, as shown in FIGS. 11 and 12, the buffer ring 30 </ b> B is formed in a C shape by a material having a restoring force, such as metal, and is a spring main body portion that tightens the fixing member 13 </ b> B in a state of being accommodated in the accommodating portion 25 </ b> B 31 and a tightening force adjusting mechanism 32 that is provided in the spring main body 31 and can adjust the tightening force of the spring main body 31. Although the details of the buffer ring 30B will be described later, a restoring force corresponding to the axial compressive load is generated, and the impact at the time of contact after the upper fixing member 15B is lifted is reduced by the restoring force (reaction force). It functions as a buffer member.

  The spring main body 31 has a first tapered surface 31a that contacts the first conical surface 19 of the lower fixing member 14B and a second conical surface 20 of the upper fixing member 15B on the inner peripheral side thereof. 2 taper surfaces 31b. The tightening force adjusting mechanism 32 includes a mounting portion 33 provided on each radially outer side at both ends of the C shape of the spring main body portion 31, and a mounting nut 34 fixed to one (left side in FIG. 12) mounting portion 33. The tightening force of the spring body 31 can be adjusted by adjusting the screw 35 that is screwed into the mounting nut 34 and passes through the other mounting portion 33 (right side in FIG. 12) and the screwing amount with respect to the screw 35. And an adjustment nut 36.

  Next, the effect | action in 2nd Embodiment of the sliding support and seismic isolation system of this invention is demonstrated using FIG. 11 thru | or FIG.

  As shown in FIG. 11, with the lower surface of the upper fixing member 15B in contact with the upper surface of the lower fixing member 14B, the buffering ring 30B is disposed in the accommodating portion 25B of the fixing member 13B. Thereafter, the tightening force of the spring body 31 is adjusted by the tightening force adjusting mechanism 32 shown in FIG. Specifically, the screwing amount of the adjustment nut 36 with respect to the screw 35 is adjusted. Thus, the buffer ring 30B has the same diameter as that of the accommodating portion 25B, but the length of the arc is longer than that before adjusting the tightening force according to the screwing amount of the adjusting nut 36. become longer. That is, the gap width W at both ends of the C shape of the spring body 31 is smaller than that before adjusting the tightening force.

  When the upper building 4 is lifted due to the seismic motion, the axial compressive load on the buffering ring 30B becomes smaller as the upper fixing member 15B moves upward, as shown in FIG. For this reason, a restoring force is generated in the buffer ring 30B so that the arc length of the spring main body 31 returns to the original length. That is, the spring body 31 is reduced in diameter. As a result, the buffer ring 30B moves upward along the first conical surface 19 of the lower fixing member 14B, and a part of the inner periphery thereof is the upper surface of the lower fixing member 14B and the lower surface of the upper fixing member 15B. It will be in the state where it entered into the gap between.

  Thereafter, when the upper fixing member 15B comes into contact with the lower fixing member 14B again, the buffering ring 30B that contacts the first conical surface 19 of the lower fixing member 14B and the second conical surface 20 of the upper fixing member 15B. On the other hand, the axial compressive load increases. That is, the buffer ring 30B receives a force that is spread outward in the radial direction. At this time, a reaction force (restoring force) proportional to the tightening force of the buffering ring 30B is generated in the buffering ring 30B against the force of expanding the buffering ring 30B. The impact caused by the contact of the fixing member 15B is reduced.

  According to the second embodiment of the sliding bearing and seismic isolation system of the present invention described above, the same effects as those of the first embodiment described above can be obtained.

  In addition, according to the present embodiment, the sliding support 10B is configured so that the buffering ring 30B is accommodated in the accommodating portion 25B formed on the outer peripheral side of the fixing member 13B, so the fixing member 13B of the sliding support 10B, etc. It is possible to install the buffer ring 30 </ b> B even after installing between the lower foundation 2 and the upper building 4.

  Furthermore, according to the present embodiment, since the tightening force of the buffer ring 30B can be adjusted by the tightening force adjusting mechanism 32, the buffer performance of the buffer ring 30B can be easily adjusted.

  Further, according to the present embodiment, the tightening force adjusting mechanism 32 is mainly composed of the screw 35 and the adjusting nut 36, so that the tightening force of the buffer ring 30B can be adjusted with a simple configuration. it can.

  Furthermore, according to the present embodiment, since the tightening force adjusting mechanism 32 is configured to be positioned on the outer peripheral side of the fixing member 13B, the fixing member 13B and the like of the sliding bearing 10B are connected to the lower foundation plate 2 and the upper building. Even after installing between 4 and 4, the tightening force of the buffer ring 30B can be adjusted.

  In the above-described second embodiment, the example in which the buffer ring 30B is disposed in the housing portion 25B formed over the outer peripheral portions of the lower fixing member 14B and the upper fixing member 15B has been described. The shape and arrangement of the ring are not limited as long as the ring has a structure that generates a reaction force according to a change in the compressive load in the axial direction with respect to the upper fixing member and the lower fixing member. For example, the following modifications are possible.

[Modification of Second Embodiment]
Next, a modification of the second embodiment of the sliding support and seismic isolation system of the present invention will be described with reference to FIGS.
FIG. 14: is a longitudinal cross-sectional view which shows an example of the modification of 2nd Embodiment of the sliding support of this invention, and is a figure which shows the state at the time of the contact after the upper building lifts. FIG. 15: is a longitudinal cross-sectional view which shows the other example of the modification of 2nd Embodiment of the sliding bearing of this invention, and is a figure which shows the state at the time of the contact after the upper building lifts. In FIG. 14 and FIG. 15, the same reference numerals as those shown in FIG. 1 to FIG.
First, an example of a modification of the second embodiment of the sliding bearing and seismic isolation system of the present invention will be described with reference to FIG.

  In the second embodiment, the buffer ring 30B is accommodated in an annular accommodating portion 25B formed by the first conical surface 19 of the lower fixing member 14B and the second conical surface 20 of the upper fixing member 15B. Is. On the other hand, an example of a modification of the second embodiment of the sliding bearing of the present invention shown in FIG. 14 includes the first conical surface 19 of the lower fixing member 14B and the outer peripheral portion of the lower surface of the upper fixing member 15C. The buffer ring 30C is accommodated in the annular accommodating portion 25C formed by the above. That is, a conical surface is not formed on the outer peripheral portion of the lower surface of the upper fixing member 15C. Further, the spring main body 31C of the buffer ring 30C has only the first tapered surface 31a contacting the first conical surface 19 of the lower fixing member 14B as the tapered surface.

  In the present embodiment, when the seismic motion acts and the upper building 4 is lifted, the buffer ring 30C is moved along with the upward movement of the upper fixing member 15C as in the second embodiment. The diameter is reduced by the restoring force. As a result, the buffer ring 30C is in a state in which a part of its inner peripheral portion enters a gap between the upper surface of the lower fixing member 14B and the lower surface of the upper fixing member 15C. Thereafter, as the upper fixing member 15C pushes down the buffer ring 30C in the downward direction, the buffer ring 30C receives a force that is pushed outward in the radial direction. At this time, a reaction force (restoring force) proportional to the tightening force of the buffer ring 30C is generated in the buffer ring 30C against the force of spreading the buffer ring 30C, and the upper fixing member 15C and the lower fixing member are fixed. The impact due to the contact of the member 14B is reduced.

Next, another example of the modification of the second embodiment of the sliding support and seismic isolation system of the present invention will be described with reference to FIG.
In the second embodiment, the buffer ring 30B is in contact with the annular housing portion 25B formed over the outer peripheral portion of the upper surface of the lower fixing member 14B and the lower surface of the upper fixing member 15B. It is something to house. On the other hand, another example of the modification of the second embodiment of the sliding bearing of the present invention shown in FIG. 15 is the first receiving groove portion 21 and the upper fixing member 15D provided on the upper surface of the lower fixing member 14D. The buffer ring 30D is accommodated in an annular accommodating portion 25D formed by the second accommodating groove portion 22 provided on the lower surface of the housing so that the outer peripheral side thereof abuts.

  Specifically, the first receiving groove portion 21 of the lower fixing member 14D is formed in a substantially annular shape on the outer side of the concave portion 16, and a lower conical surface 21a whose diameter is increased upward is formed on the outer peripheral side thereof. Have. The second receiving groove portion 22 of the upper fixing member 15D is formed in a substantially annular shape on the outer side of the protrusion 17, and has an upper conical surface 22a that expands in the downward direction on the outer peripheral side thereof.

  For example, the buffering ring 30 </ b> D includes only a main body 31 </ b> D that is formed so that a force to compress inward in the radial direction acts in the state of being accommodated in the accommodating portion 25 </ b> D. That is, the diameter of the buffer ring 30D is smaller in the state of being accommodated in the accommodating portion 25D than in the no-load state. The spring body portion 31D has a first tapered surface 31c that contacts the lower conical surface 21a of the first housing groove portion 21 and a second contact surface of the upper conical surface 22a of the second housing groove portion 22 on the outer peripheral side thereof. And a tapered surface 31d.

  In the present embodiment, when the upper building 4 is lifted due to the seismic motion, the buffer ring 30D is expanded by its restoring force as the upper fixing member 15D moves upward. As a result, the buffer ring 30D is in a state in which a part of the outer peripheral portion enters a gap between the upper surface of the lower fixing member 14D and the lower surface of the upper fixing member 15D. Thereafter, the buffer ring 30D receives a force that is compressed inward in the radial direction as the buffer ring 30D is pushed downward by the upper fixing member 15D. At this time, a reaction force (restoring force) against the force that compresses and compresses the buffer ring 30D is generated in the buffer ring 30D, and the impact caused by the contact between the upper fixing member 15D and the lower fixing member 14D is reduced.

  According to the above-described modification of the second embodiment of the sliding bearing and seismic isolation system of the present invention, the same effects as those of the second embodiment described above can be obtained.

  According to another example of the modification of the second embodiment, even when the lower fixing member and the upper fixing member are formed in a shape other than a columnar shape, for example, a prismatic shape, Can be used.

[Other embodiments]
In the above-described modified examples of the first to second embodiments of the seismic isolation system of the present invention, the seismic isolation building 1 has been described as an example of a structure to which the seismic isolation system is applied. It can also be applied to structures other than buildings, such as factory equipment and general buildings. For example, the present invention can be applied to a building composed of a lower building as a lower structure and an upper building as an upper structure provided on the foundation. Further, the present invention can be applied to a bridge composed of a bridge pier as a lower structure and a bridge girder as an upper structure.

  In the above-described embodiment, the example of the seismic isolation system constituted by the sliding bearing 10 and the laminated rubber bearing 5 is shown, but the seismic isolation system constituted only by the plurality of sliding bearings 10 is also possible. Also in this case, it is possible to mitigate the impact after the upper building 4 is lifted due to the input of the earthquake motion.

  In the above-described embodiment, the example in which the cross-sectional shape of the protrusion 17 of the upper fixing member 15 and the recess 16 of the lower fixing member 14 is circular and the installation position is the center is shown. And the cross-sectional shape and installation position of a recessed part are arbitrary if it can prevent the drop-off from the lower side fixing member which arises when the upper building 4 floats.

  In the above-described embodiment, the example in which the protrusion 17 provided on the upper fixing member 15D is fitted into the recess 16 provided on the lower fixing member 14D has been described. However, the upper fixing member is provided with the recess. A structure in which a protrusion is provided on the lower fixing member and the protrusion of the lower fixing member is fitted in the recess of the upper fixing member is also possible.

  In the first embodiment described above and the modifications thereof, the accommodating portion 25 is formed by the accommodating groove portion 18 provided in the upper fixing member 15 and the upper surface of the lower fixing member 14 that closes the opening of the accommodating groove portion 18. Although the formed example is shown, it is also possible to form the accommodating portion by the accommodating groove portion provided in the lower fixing member and the lower surface of the upper fixing member that closes the opening of the accommodating groove portion. Furthermore, the first housing portion is formed by the housing groove portion provided in the upper fixing member and the upper surface of the lower fixing member that closes the opening of the housing groove portion, and the housing groove portion provided in the lower fixing member and the It is also possible to form the second accommodating portion by the lower surface of the upper fixing member that closes the opening of the accommodating groove. In this case, the impact at the time of contact after the upper building 4 is lifted can be reduced by the two buffer members.

  In the above-described first embodiment and its modification, the example in which the elastic body 30 or the elastic-plastic body 30A as the buffer member is formed in an annular shape is shown, but the contact after the upper building 4 is lifted is shown. If it is possible to mitigate the impact at the time, the shape and arrangement of the buffer member (elastic body, elastic-plastic body, etc.) are arbitrary. For example, it is possible to form a polygonal ring such as a triangle or a quadrangle. Moreover, the structure which arrange | positions several rod-shaped buffer members radially is also possible. In this case, the accommodating part which accommodates a buffer member is formed corresponding to the shape and arrangement | positioning of a buffer member.

  Further, in the above-described first embodiment and the modifications thereof, the example in which the fixing member 13 is formed in a columnar shape is shown. However, the shape of the fixing member is arbitrary as long as the upper building 4 can be supported. is there.

  In the above-described first embodiment, an example in which the elastic body 30 is used as the buffer member has been described. However, an elastic-plastic body or a viscoelastic body may be used as the buffer member. When an elastic-plastic body is used as the buffer member, energy absorption due to plastic deformation, and impact at the time of contact after the upper building 4 is lifted can be reduced compared to the case where the elastic body 30 is used.

  Further, in an example of the modification of the second embodiment described above, the accommodating portion 25C formed by the first conical surface 19 of the lower fixing member 14B and the outer peripheral portion of the lower surface of the upper fixing member 15C is used for buffering. Although the example of the structure which accommodates the ring 30C was shown, accommodating a buffering ring in the accommodating part formed by the conical surface provided in the outer peripheral part of the lower surface of an upper side fixing member, and the outer peripheral part of the upper surface of a lower side fixing member Is also possible.

  In another example of the modification of the second embodiment described above, the accommodating portion 25D is formed by the first and second accommodating groove portions 21a and 22a provided in the lower fixing member 14D and the upper fixing member 15D. Although the example of the structure which showed was shown, the upper surface or upper side fixing member of the lower side fixing member which provides an accommodation groove part in any one of a lower side fixing member and an upper side fixing member, and obstruct | occludes the accommodation groove part and the opening part of the accommodation groove part It is also possible to form the accommodating portion with the lower surface of the. Further, the first receiving portion is formed by the receiving groove portion provided in the lower fixing member and the lower surface of the upper fixing member that closes the opening of the receiving groove portion, and the receiving groove portion provided in the upper fixing member and its receiving portion. It is also possible to form the second accommodating portion by the upper surface of the lower fixing member that closes the opening of the groove. In this case, the impact at the time of contact after the upper building 4 is lifted can be reduced by the two buffering rings.

  Further, in another example of the modification of the second embodiment described above, the lower and upper conical surfaces 21a and 22a are provided on the outer peripheral sides of the first and second receiving groove portions 21a and 22a, respectively. Although an example is shown, it is also possible to provide a lower side and an upper side conical surface on the inner peripheral side of the first and second accommodation grooves, respectively. In this case, the shock-absorbing ring has first and second tapered surfaces on the inner peripheral portion thereof, and is formed such that a force that spreads radially outward acts in a state of being accommodated in the accommodating portion. There is a need.

  The present invention is not limited to the modified examples of the first to second embodiments described above, and includes various modified examples. The above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the configurations described. For example, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is also possible to add, delete, or replace another configuration for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Base isolation building (structure), 2 ... Lower base version (lower structure), 3 ... Base isolation layer (base isolation system), 4 ... Upper building (upper structure), 5 ... Laminated rubber bearing, 10, 10A, 10B, 10C, 10D ... Slide bearing, 11 ... Lower sliding member, 12 ... Upper sliding member, 14,14B, 14D ... Lower fixing member, 15,15B, 15C, 15D ... Upper fixing member, 16 ... Recess 17 ... Projection, 18 ... Housing groove, 19 ... First conical surface (conical surface), 20 ... Second conical surface (conical surface), 21 ... First housing groove (housing groove), 21a ... Bottom Side conical surface (conical surface), 22 ... second accommodation groove (accommodation groove), 22a ... upper conical surface (conical surface), 25, 25B, 25C, 25D ... accommodation portion, 30 ... elastic body (buffer member), 30A: Elasto-plastic body (buffer member), 30B, 30 , 30D ... buffer ring (cushioning member), 31,31C, 31D ... spring body portion, 31a, 31c ... first tapered surface, 31b, 31d ... second tapered surface, 32 ... clamping force adjusting mechanism,

Claims (11)

A sliding bearing installed between the lower structure and the upper structure of the structure,
A lower sliding member fixed on the lower structure;
An upper sliding member disposed on the lower sliding member and slidable relative to the lower sliding member;
A lower fixing member that is disposed on the upper side of the upper sliding member and to which the upper sliding member is fixed;
An upper fixing member whose lower surface is in contact with the upper surface of the lower fixing member and whose upper end is fixed to the upper structure;
An accommodating portion formed between the lower fixing member and the upper fixing member;
A sliding bearing, comprising: a cushioning member disposed within the housing portion and for mitigating an impact at the time of contact after the upper structure is lifted by a restoring force. In the sliding support according to claim 1,
A housing groove is provided on at least one of the upper surface of the lower fixing member and the lower surface of the upper fixing member,
The sliding support, wherein the housing portion is formed by the housing groove portion and a lower surface of the upper fixing member or an upper surface of the lower fixing member that closes an opening of the housing groove portion. In the sliding support according to claim 2,
The sliding support, wherein the cushioning member is entirely accommodated in the accommodating portion in a compressed state. In the sliding support according to claim 2,
The buffer member is an elastic-plastic body,
The elasto-plastic body is housed in the housing portion in a state where the upper end portion and the lower end portion thereof are fixed to the upper fixing member and the lower fixing member, respectively. In the sliding support according to claim 1,
The accommodating portion is formed in an annular shape and has a conical surface,
The sliding support according to claim 1, wherein the buffer member is a buffer ring having a tapered surface that abuts on the conical surface of the housing portion and generating a restoring force by an axial compressive load. In the sliding support according to claim 5,
The lower fixing member and the upper fixing member are formed in a columnar shape,
The storage portion is formed by outer peripheral portions of the lower fixing member and the upper fixing member,
The shock-absorbing ring is formed in a C shape and includes a spring body portion having the tapered surface on the inner peripheral side thereof. In the sliding support according to claim 6,
The sliding support according to claim 1, wherein the buffer ring further includes a tightening force adjusting mechanism that is provided on the spring main body and is capable of adjusting a tightening force of the spring main body. In the sliding support according to claim 5,
At least one of the upper surface of the lower fixing member and the lower surface of the upper fixing member is provided with an annular housing groove having the conical surface,
At least a part of the storage part is formed by the storage groove part,
The shock-absorbing ring is formed in a C shape and includes a spring main body portion having the tapered surface. In the sliding support of any one of Claims 1 thru | or 8,
The lower fixing member has a recess or a protrusion on its upper surface,
The upper support member has, on its lower surface, a protrusion or a recess that fits into the recess or the protrusion of the lower fixing member. A seismic isolation system that is interposed between the lower structure and the upper structure of the structure and reduces the seismic load input to the upper structure,
With at least several sliding supports,
Each of the plurality of sliding bearings is
A lower sliding member fixed on the lower structure;
An upper sliding member disposed on the lower sliding member and slidable relative to the lower sliding member;
A lower fixing member that is disposed on the upper side of the upper sliding member and to which the upper sliding member is fixed;
An upper fixing member whose lower surface is in contact with the upper surface of the lower fixing member and whose upper end is fixed to the upper structure;
An accommodating portion formed between the lower fixing member and the upper fixing member;
A seismic isolation system, comprising: a shock absorbing member disposed in the housing portion and relieving an impact at the time of contact after the upper structure is lifted by a restoring force. The seismic isolation system according to claim 10,
Further provided with a plurality of laminated rubber bearings,
The plurality of sliding bearings are arranged on the outer peripheral side of the lower structure,
The seismic isolation system, wherein the plurality of laminated rubber bearings are disposed inside the plurality of sliding bearings.

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