JP2013148106A - Thin slide support device for construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin slide support device for construction which is simple in structure, reduced in the number of part items, thinned in the thickness of a support, and easy in installation and replacement work.SOLUTION: A thin slide support device comprises: a base plate 5 fixed to a lower structure 2 such as a foundation; a support holding member 6 detachably fixed to the base plate with an installation bolt 20 and formed with a hollow support holding part 8; a rubber layer 12 having steel plates 13, 14 at upper and lower faces formed below the support holding part and expandable to a side face; a lower-part slide member 16 which is arranged on the rubber layer of the support holding part and installed with a low-friction material 17 at its upper part, and whose upper end is protruded upward from the upper face of the support holding member; and an upper-part slide member 18 which is fixed to the side of an upper structure 3 and forms a slide face by contacting with the lower-part slide member. A penetration hole or a recess 15 is formed at least at one face of the upper and lower plates with which a flat part of the rubber layer contacts, and the elastic deformation of the rubber layer caused by stress is absorbed by the swelling of the side face of the rubber layer and the swelling of the flat part of the rubber layer to the penetration hole or the recess.

Description

  The present invention relates to a thin sliding support device for a structure installed between a lower structure and an upper structure of a structure such as a building or a bridge.

  Conventionally, the load of the upper structure is supported on the lower structure side between the lower structure and the upper structure of a structure such as a building or a bridge, and a horizontal force exceeding a predetermined level is applied to the lower structure side due to the occurrence of an earthquake. A structure in which sliding bearing means that allows the upper structure to slide in the horizontal direction relative to the lower structure when it acts, and a laminated rubber made of a plurality of vertically laminated reinforcing steel plates and rubber that elastically support the load of the upper structure Material sliding bearings have been developed.

JP-A-8-68234

  The conventional sliding bearing for a structure has a problem that the thickness of the laminated rubber has to be increased in order to elastically support the vertical load of the superstructure, and the height of the bearing is increased. Also, since a large shearing force is applied to the laminated rubber due to the frictional force accompanying the relative movement of the sliding means due to a large horizontal displacement during an earthquake, a shearing force restraining means for restraining the shearing force of the laminated rubber must be provided. In other words, the structure of the support is complicated, and there is a problem that installation work and replacement work take a long time.

  The present invention solves the problems of the prior art, has a simple structure, a small number of parts, a thin support, easy installation and replacement, and a buffering function against a large horizontal displacement during an earthquake. An object of the present invention is to provide a low-profile sliding bearing device.

  In order to solve the above-described problems, a thin sliding support device for a structure according to the present invention includes a base plate fixed to a lower structure, and a support that is detachably fixed to the base plate with a mounting bolt and has a hollow support holding portion. A holding member, a rubber layer having a steel plate on the upper and lower surfaces arranged at the lower part of the support holding part and capable of expanding to the side part, and arranged on the rubber layer of the support holding part, A lower sliding member in which a friction material is installed and an upper end portion protrudes upward from an upper surface of the support holding member; and an upper sliding member which is fixed to an upper structure side and forms a sliding surface in contact with the lower sliding member, A through hole or a recess is formed in at least one surface of the upper and lower steel plates that contact the flat portion of the rubber layer, and the elastic deformation of the rubber layer due to stress is caused to bulge out the side surface portion of the rubber layer and the flat portion of the rubber layer. The through hole or Characterized in that it absorbed by bulging into the recess.

  Further, the thin sliding support device for a structure of the present invention includes a base plate fixed to a lower structure, a support holding member that is detachably fixed to the base plate with a mounting bolt and formed with a hollow support holding portion, and the support A rubber layer having steel plates on the upper and lower surfaces arranged at the lower part of the holding part and capable of expanding to the side part, and arranged on the rubber layer of the support holding part, with a low friction material installed at the upper part and the upper end A lower sliding member protruding upward from the upper surface of the support holding member, and an upper sliding member fixed to the upper structure side and forming a sliding surface in contact with the lower sliding member, and a flat portion of the rubber layer A through hole or a recess is formed in at least one surface of the upper and lower steel plates in contact with each other, and elastic deformation of the rubber layer due to stress is caused by swelling of the side surface portion of the rubber layer and the through hole of the flat surface portion of the rubber layer or the For bulging into the recess Ri absorbed, the bearing holding portion inner wall arranged rubber buffer between the lower sliding member outer peripheral, characterized by buffering the impact due to horizontal stress during an earthquake.

  Moreover, the thin sliding support device for a structure according to the present invention is characterized in that the buffer rubber is disposed in a diameter-enlarged portion obtained by expanding an inner wall corresponding to an outer peripheral portion of the lower sliding member of the support holding portion.

  The thin sliding support device for a structure according to the present invention is characterized in that a plurality of through holes are formed in the cushion rubber.

  The thin sliding support device for a structure according to the present invention is characterized in that the rubber layer and the lower sliding member are integrated by vulcanization integral molding.

  Further, the thin sliding support device for a structure of the present invention has a mounting step portion formed on the support holding member, and is fixed with the mounting bolt of the support holding member, and the upper end position of the mounting bolt is set to the position of the support holding member. It is characterized by being positioned below the upper surface.

A base plate fixed to the lower structure, a support holding member that is detachably fixed to the base plate with a mounting bolt and formed with a hollow support holding portion, and steel plates are provided on the upper and lower surfaces arranged below the support holding portion. A rubber layer capable of expanding to the side surface portion, and a lower portion disposed on the rubber layer of the support holding portion, with a low friction material disposed on the upper portion, and an upper end portion protruding upward from the upper surface of the support holding member A sliding member, and an upper sliding member fixed on the upper structure side and in contact with the lower sliding member to form a sliding surface, and a through hole or at least one surface of the upper and lower steel plates with which the flat portion of the rubber layer contacts By forming a recess and absorbing elastic deformation of the rubber layer due to stress by swelling of the side surface of the rubber layer and swelling of the flat surface of the rubber layer into the through hole or the recess, the shear force is restrained. Use means Rukoto without, since the rubber layer and the lower sliding member can be installed without the use of connecting means such as, mounting, it is facilitated replacement. Further, since the flat portion of the rubber layer is elastically deformed into the through hole or the concave portion due to stress such as a vertical load, a large compressive strain can be obtained as compared with the case where only the side surface portion of the rubber layer is elastically deformed. It is possible to absorb the rotational displacement at the time of the earthquake with the increased compression strain rubber layer. Furthermore, since the energy absorption performance by the compressive strain of the rubber layer is large, the thickness of the rubber layer can be reduced, and the sliding bearing can be made thinner. In addition, since the rubber layer is disposed in a sealed state on the support holding portion, it is possible to prevent deterioration of the rubber layer due to dust and the environment.
A base plate fixed to the lower structure, a support holding member that is detachably fixed to the base plate with a mounting bolt and formed with a hollow support holding portion, and steel plates are provided on the upper and lower surfaces arranged below the support holding portion. A rubber layer capable of expanding to the side surface portion, and a lower portion disposed on the rubber layer of the support holding portion, with a low friction material disposed on the upper portion, and an upper end portion protruding upward from the upper surface of the support holding member A sliding member, and an upper sliding member fixed on the upper structure side and in contact with the lower sliding member to form a sliding surface, and a through hole or at least one surface of the upper and lower steel plates with which the flat portion of the rubber layer contacts A recess is formed, and elastic deformation of the rubber layer due to stress is absorbed by swelling of the side surface of the rubber layer and swelling of the flat portion of the rubber layer into the through hole or the recess, and the inner wall of the support holding portion And the lower slide It is possible to cope with horizontal displacement in all directions by placing shock absorbing rubber between the outer circumferences of the members and buffering impacts caused by horizontal stress during earthquakes, and using connecting means etc. for the rubber layer and lower sliding member It can be installed without any problems, making it easy to install and replace. Further, since the flat portion of the rubber layer is elastically deformed into the through hole or the concave portion due to stress such as a vertical load, a large compressive strain can be obtained as compared with the case where only the side surface portion of the rubber layer is elastically deformed. It is possible to absorb the rotational displacement at the time of the earthquake with the increased compression strain rubber layer. Furthermore, since the energy absorption performance by the compressive strain of the rubber layer is large, the thickness of the rubber layer can be reduced, and the sliding bearing can be made thinner. In addition, a shock absorbing rubber is placed between the outer periphery of the lower sliding member and the inner wall of the bearing, so that an impact caused by an instantaneous large horizontal force due to friction caused by the relative displacement between the lower structure and the upper structure via the sliding surface during an earthquake. It is possible to prevent breakage due to the impact of the sliding bearing. Further, since the rubber layer is disposed in a substantially sealed state on the support holding portion, it is possible to prevent the rubber layer from being deteriorated due to dust, the environment, and the like.
By arranging the cushioning rubber in the enlarged diameter part where the inner wall corresponding to the outer peripheral part of the lower sliding member of the bearing holding part is enlarged, the sectional shape of the bearing holding part is kept the same even if the cushioning rubber is arranged. Therefore, it is possible to facilitate installation or replacement work of the rubber layer and the lower sliding member on the support holding portion.
By forming a plurality of through holes in the buffer rubber, the buffer rubber is easily elastically deformed, and the buffer performance can be improved.
By integrating the rubber layer and the lower sliding member by vulcanization integral molding, the rubber layer and the lower sliding member are integrated in advance, so it is possible to easily install or replace the rubber layer and the lower sliding member. It becomes.
A mounting step is formed on the bearing holding member, and after fixing with the mounting bolt of the bearing holding member, the upper end position of the mounting bolt is positioned below the upper surface of the bearing holding member, thereby obstructing the upper surface of the bearing holding member. Since there is no object, it is possible to reduce the thickness of the sliding bearing by suppressing the protruding height of the lower sliding member forming the sliding structure and the sliding surface from the upper surface of the bearing holding member.

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  Embodiments of the present invention will be described with reference to the drawings. 1 and 2 are schematic views of an embodiment of a thin sliding bearing device 1 for a structure.

  The thin sliding bearing 1 for a structure has a base plate 5 fixed by anchor bolts 4 embedded in a lower structure 2 such as a foundation.

  A support holding member 6 is detachably fixed on the base plate 5 by mounting bolts 20. The support holding member 6 is a steel plate member having a predetermined thickness. The fixing step of the support holding member 6 to the base plate 5 by the mounting bolt 20 is formed with a mounting step 8 lower than the upper surface of the support holding member 6, and the head of the mounting bolt 20 after the support holding member 6 is fixed by the mounting bolt 7. The upper end position of the part is set to a position below the upper surface of the support holding member 6.

  A support holding portion 8 penetrating the support holding member 6 having a circular cross section is formed at the center of the support holding member 6. In the embodiment shown in FIGS. 1 and 2, the cross-sectional shape of the support holding portion 8 is circular, but the cross-sectional shape of the support holding portion 8 may be rectangular or elliptical.

  A rubber layer 12 in which an upper steel plate 13 and a lower steel plate 14 are arranged on the upper and lower surfaces is installed below the support holding unit 8. The rubber layer 12 and the upper and lower steel plates 13 and 14 are integrated by vulcanization integral molding. The shapes of the upper and lower steel plates 13 and 14 are similar to the cross-sectional shape of the support holding portion 8, and the outer diameter thereof is substantially the same as the inner diameter of the support holding portion, thereby preventing the rubber layer 12 from moving in the horizontal direction. The outer diameter of the rubber layer 12 is made smaller than the outer diameters of the upper and lower steel plates 13 and 14 in order to secure a space where the rubber layer 12 can bulge in the lateral direction. A through hole or a recess 15 is formed in at least one of the surfaces of the upper and lower steel plates 13 and 14 in contact with the rubber layer 12.

  A lower sliding member 16 is inserted and installed in the upper part of the support holding unit 8 where the rubber layer 12 is installed. A low friction material 17 such as tetrafluoroethylene resin is installed on the upper part of the lower sliding member 16. The cross-sectional shape of the lower sliding member 16 is similar to the cross-sectional shape of the support holding portion 8, and the outer diameter thereof is approximately the same as the inner diameter of the support holding portion 8. The lower sliding member 16 on which the low friction material 17 is installed is installed such that the upper end portion protrudes upward from the upper surface of the support holding member 6. Since there are no obstacles on the upper surface of the support holding member 6, the protrusion height h of the lower sliding member 16 can be kept low, and the support can be made thinner. Moreover, since the installation depth H to the support holding part 8 of the lower slide member 16 can be ensured by suppressing the protrusion height h from the upper surface of the support holding member 6 of the lower slide member 16, horizontal force at the time of an earthquake It is possible to reliably resist.

  Since the rubber layer 12 is disposed in a substantially sealed state on the support holding portion 8, deterioration due to dust and the environment is prevented. Further, since the rubber layer 12 and the lower sliding member 16 are simply laminated on the support holding portion 8, no connection and fixing means are required, the number of parts can be reduced, and installation and replacement operations can be made easier.

  In the upper structure 3, an upper sliding member 18 formed of high-rigidity stainless steel or the like is fixed by a set bolt 19, and the low friction material 17 and the upper sliding member 18 installed on the lower sliding member 16 are in surface contact and slide. Form a surface.

  The structure sliding support device 1 of this embodiment exhibits a large frictional resistance force on the sliding surface against forces other than earthquakes such as traffic vibration and wind shaking, and is not affected by wind shaking of the upper structure 3 or the like. . When a large horizontal force at the time of an earthquake acts on the lower structure 2 such as the foundation, the sliding surface allows a horizontal relative displacement between the lower structure 2 and the upper structure 3 and reduces transmission of the seismic force to the upper structure 3. To do.

  When an earthquake occurs, as shown in FIG. 4, the side surface portion of the rubber layer 12 swells due to the stress applied by the earthquake, and the flat portion of the rubber layer 12 is formed in at least one of the upper and lower steel plates 13 and 14. It bulges into the hole or recess 15 and absorbs its energy. Since the flat surface portion of the rubber layer 12 is elastically deformed and bulges into the through hole or the recess 15, a large compressive strain can be obtained as compared with the case where only the side surface portion of the rubber layer 12 is elastically deformed, and the increased compressive strain. The minute rubber layer 12 can absorb rotational displacement during an earthquake. Furthermore, since the energy absorption performance by the compressive strain of the rubber layer 12 is large, the thickness of the rubber layer 12 can be reduced, and the sliding bearing can be made thinner.

  Further, when an earthquake occurs, the lower structure 2 and the lower structure 3 are relatively displaced via the sliding surface by a horizontal force acting on the lower structure 2. The sliding surface formed between the lower sliding member 16 of the lower structure 2 and the upper sliding member 18 of the lower structure 3 is relatively displaced by the seismic force with a large load applied to the lower structure 3. A large frictional force acts on the sliding surface. A large frictional force acting on the sliding surface generates a large reaction force on the lower sliding member 16. However, since the lower sliding member 16 is installed at a sufficient installation depth in the support holding portion 8, However, it becomes possible to resist.

  FIG. 3 is a schematic view of another embodiment of a thin sliding bearing device 1 for a structure.

  In this embodiment, the rubber layer 12 and the lower sliding member 16 installed on the support holding portion 8 in the embodiment shown in FIGS. 1 and 2 are formed separately from each other, whereas the rubber layer 12 and the lower portion are formed separately. The configuration is different in that the sliding member 16 is integrated in advance.

  The lower steel plate 14 is disposed on the lower surface of the rubber layer 12, the lower surface of the lower sliding member 16 is in contact with the upper surface of the rubber layer 12, and the lower steel plate 14, the rubber layer 12, and the lower sliding member 16 are formed by vulcanization integral molding. Integrate. By integrating the rubber layer 12 and the lower sliding member 16 in advance, the operation of installing or replacing the rubber layer and the lower sliding member 16 on the support holding portion 8 becomes easier. Other configurations, operations, and effects are the same as those of the embodiment shown in FIGS.

  5 and 6 are schematic views of another embodiment of the thin sliding support device 1 for a structure.

In the thin sliding support device 1 for a structure, a base plate 5 is fixed by anchor bolts 4 embedded in a lower structure 2 such as a foundation.

  A support holding member 6 is detachably fixed on the base plate 5 by mounting bolts 20. The support holding member 6 is a steel plate member having a predetermined thickness. The fixing portion of the support holding member 6 to the base plate 5 by the mounting bolt 20 is formed with a mounting step 7 lower than the upper surface of the support holding member 6, and the head of the mounting bolt 20 after the support holding member 6 is fixed by the mounting bolt 7. The upper end position of the part is set to be equal to or lower than the upper surface of the support holding member 6, the presence of obstacles protruding on the upper surface of the support holding member 6 is eliminated, and the gap between the sliding surfaces formed with the upper structure is reduced. Is possible.

  A support holding portion 8 penetrating the support holding member 6 having a circular cross section is formed at the center of the support holding member 6. An enlarged diameter portion 9 having a larger inner diameter than the lower portion is formed on the upper inner wall of the support holding portion 8. A ring-shaped buffer rubber 10 is installed in the enlarged diameter portion 9. The inner diameter of the inner wall surface of the ring-shaped buffer rubber 10 installed in the expanded diameter portion 9 is set to be substantially the same as the inner diameter of the lower inner wall of the support holding portion 8 where the diameter is not expanded. As shown in FIG. 5, a plurality of through holes 11 may be formed in the buffer rubber 10. In the embodiment shown in FIGS. 5 and 6, the cross-sectional shape of the support holding portion 8 is circular, but the cross-sectional shape of the support holding portion 8 may be rectangular or elliptical.

  A rubber layer 12 in which an upper steel plate 13 and a lower steel plate 14 are arranged on the upper and lower surfaces is installed below the support holding unit 8. The rubber layer 12 and the upper and lower steel plates 13 and 14 are integrated by vulcanization integral molding. The shapes of the upper and lower steel plates 13 and 14 are similar to the cross-sectional shape of the support holding portion 8, and the outer shape thereof is substantially the same as the inner diameter of the support holding portion 8, thereby preventing the rubber layer 12 from moving in the horizontal direction. The outer diameter of the rubber layer 12 is made smaller than the outer diameters of the upper and lower steel plates 13 and 14 in order to secure a space where the rubber layer 12 can bulge in the lateral direction. A through hole or recess 15 is formed on at least one of the surfaces of the upper and lower steel plates 13 and 14 in contact with the horizontal surface of the rubber layer 12.

  A lower sliding member 16 is inserted and installed in the upper part of the support holding unit 8 where the rubber layer 12 is installed. A low friction material 17 such as tetrafluoroethylene resin is installed on the upper part of the lower sliding member 16. The cross-sectional shape of the lower sliding member 16 is similar to the cross-sectional shape formed by the inner wall portion of the shock absorbing rubber 10 installed in the enlarged diameter portion 9, and the outer diameter thereof is approximately the same as the inner diameter of the ring-shaped shock absorbing rubber 10. To do. The lower sliding member 16 on which the low friction material 17 is installed is installed such that the upper end portion protrudes upward from the upper surface of the support holding member 6. Since there is no obstacle on the upper surface of the support holding member 6, the protruding height of the lower sliding member 16 can be kept low, and the support can be made thinner.

  The shock absorbing rubber 10 installed in the enlarged diameter portion 9 on the upper part of the support holding portion 8 is arranged so as to reach a position slightly deeper than the lower end portion of the lower sliding member 16 installed on the rubber layer 12. This is because the rubber layer 12 is compressed by the load of the supported structure 3 and the lower end position of the lower sliding member 16 may be slightly lowered. Since the rubber layer 12 is disposed in a substantially sealed state on the support holding portion 8, deterioration due to the environment is prevented. Further, since the rubber layer 12 and the lower sliding member 16 are simply laminated on the support holding portion 8, no connection and fixing means are required, the number of parts can be reduced, and installation and replacement operations can be made easier.

  In the upper structure 3, an upper sliding member 18 formed of high-rigidity stainless steel or the like is fixed by a set bolt 19, and the low friction material 17 and the upper sliding member 18 installed on the lower sliding member 16 are in surface contact and slide. Form a surface.

  The thin sliding support device 1 for a structure according to this embodiment exhibits a large frictional resistance force on the sliding surface against forces other than earthquakes such as traffic vibration and wind shaking, and is affected by wind shaking of the upper structure 3. Absent. When a large horizontal force at the time of an earthquake acts on the lower structure 2 such as the foundation, the sliding surface allows a horizontal relative displacement between the lower structure 2 and the upper structure 3 and reduces transmission of the seismic force to the upper structure 3. To do.

  When an earthquake occurs, as shown in FIG. 8, the side surface portion of the rubber layer 12 swells due to the stress applied by the earthquake, and the flat portion of the rubber layer 12 is formed in at least one of the upper and lower steel plates 13 and 14. It bulges into the hole or recess 15 and absorbs its energy. Since the flat surface portion of the rubber layer 12 is elastically deformed and bulges into the through hole or the recess 15, a large compressive strain can be obtained as compared with the case where only the side surface portion of the rubber layer 12 is elastically deformed, and the increased compressive strain. The minute rubber layer 12 can absorb rotational displacement during an earthquake. Furthermore, since the energy absorption performance by the compressive strain of the rubber layer 12 is large, the thickness of the rubber layer 12 can be reduced, and the sliding bearing can be made thinner.

  Further, when an earthquake occurs, the lower structure 2 and the upper structure 3 are displaced relative to each other via a sliding surface due to a horizontal force acting on the lower structure 2. When the upper structure 3 is a high-rise building or the like, the sliding force formed between the lower sliding member 16 of the lower structure 2 and the upper sliding member 18 of the upper structure 3 is a seismic force with a large load applied. Therefore, a large frictional force acts on the sliding surface. A large frictional force acting on the sliding surface generates a large reaction force on the lower sliding member 16, and an impact due to the large reaction force may break the support holding member 6 holding the lower sliding member 16. Therefore, the shock absorbing rubber 10 installed in the support holding part 8 holding the lower sliding member 16 absorbs an impact caused by a large reaction force generated in the lower sliding member 16 and prevents the support holding member 6 from being broken. As shown in FIG. 9, by forming a plurality of through holes 11 in the ring-shaped shock absorbing rubber 10, the shock absorbing rubber 10 is easily elastically deformed, and the shock absorbing performance can be improved.

  FIG. 7 is a schematic view of another embodiment of a thin sliding support device 1 for a structure.

  In this embodiment, the rubber layer 12 and the lower sliding member 16 installed in the support holding portion 8 in the embodiment shown in FIGS. The configuration is different in that the sliding member 16 is integrated in advance.

  The lower steel plate 14 is disposed on the lower surface of the rubber layer 12, the lower surface of the lower sliding member 16 is in contact with the upper surface of the rubber layer 12, and the lower steel plate 14, the rubber layer 12, and the lower sliding member 16 are formed by vulcanization integral molding. Integrate. By integrating the rubber layer 12 and the lower sliding member 16 in advance, the operation of installing or replacing the rubber layer 12 and the lower sliding member 16 on the support holding portion 8 becomes easier. Other configurations, operations, and effects are the same as those of the embodiment shown in FIGS.

  As described above, according to the thin sliding bearing device for a structure of the present invention, it can cope with horizontal displacement in all directions, has a small number of parts, is easy to install and replace, and has a low cost structure. It becomes possible to provide a sliding bearing for objects. In addition, the elastic deformation of the rubber layer due to stress can be absorbed by the swelling of the side surface portion of the rubber layer and the swelling of the flat surface portion of the rubber layer into the through hole or recess, so that a large compressive strain can be obtained, and the increased compressive strain It is possible to absorb the rotational displacement at the time of the earthquake with the minute rubber layer. Furthermore, since the energy absorption performance by the compressive strain of the rubber layer is large, the thickness of the rubber layer can be reduced, and the sliding bearing can be made thinner. In addition, the installation depth of the rubber layer and the lower sliding member to the support holding part is also against the momentary large horizontal force caused by the friction caused by the relative displacement between the lower structure and the substructure via the sliding surface during an earthquake. Can be ensured sufficiently, so that it is possible to reliably resist. Furthermore, since the rubber layer is disposed in a substantially sealed state on the support holding portion, it is possible to prevent deterioration of the rubber layer due to dust and the environment. In addition, it is possible to buffer an impact caused by an instantaneous large horizontal force due to friction caused by a relative displacement between the lower structure and the upper structure via the sliding surface at the time of an earthquake, and to prevent the damage due to the impact of the sliding bearing.

  1: Sliding bearing device for structure, 2: Lower structure, 3: Upper structure, 4: Anchor bolt, 5: Base plate, 6: Bearing holding member, 7: Mounting step, 8: Bearing holding part, 9: Expansion Diameter part, 10: Buffer rubber, 11: Through hole, 12: Rubber layer, 13: Upper steel plate, 14: Lower steel plate, 15: Through hole or recess, 16: Lower sliding member, 17: Low friction material, 18: Upper part Sliding member, 19: set bolt, 20: mounting bolt

Claims (6)

A base plate fixed to the substructure;
A support holding member, which is detachably fixed to the base plate with a mounting bolt and formed with a hollow support holding part;
A rubber layer having a steel plate on the upper and lower surfaces arranged at the lower part of the support holding part and capable of expanding to the side part;
A lower sliding member that is disposed on the rubber layer of the support holding portion, has a low friction material installed at an upper portion thereof, and has an upper end protruding upward from the upper surface of the support holding member;
An upper sliding member fixed on the upper structure side and in contact with the lower sliding member to form a sliding surface;
With
A through hole or a recess is formed in at least one surface of the upper and lower steel plates that contact the flat portion of the rubber layer, and the elastic deformation of the rubber layer due to stress is caused to bulge out the side surface portion of the rubber layer and the flat portion of the rubber layer. A thin sliding bearing device for a structure, which is absorbed by bulging into the through hole or the recess. A base plate fixed to the substructure;
A support holding member, which is detachably fixed to the base plate with a mounting bolt and formed with a hollow support holding part;
A rubber layer having a steel plate on the upper and lower surfaces arranged at the lower part of the support holding part and capable of expanding to the side part;
A lower sliding member that is disposed on the rubber layer of the support holding portion, has a low friction material installed at an upper portion thereof, and has an upper end protruding upward from the upper surface of the support holding member;
An upper sliding member fixed on the upper structure side and in contact with the lower sliding member to form a sliding surface;
With
A through hole or a recess is formed in at least one surface of the upper and lower steel plates that contact the flat portion of the rubber layer, and the elastic deformation of the rubber layer due to stress is caused to bulge out the side surface portion of the rubber layer and the flat portion of the rubber layer. Is absorbed by bulging into the through hole or the recess, and a shock absorbing rubber is disposed between the inner wall of the support holding portion and the outer periphery of the lower sliding member, and shock caused by horizontal stress during an earthquake is buffered. Thin sliding bearing device for structures.   3. The thin sliding support device for a structure according to claim 2, wherein the buffer rubber is disposed in an enlarged diameter portion of an inner wall corresponding to an outer peripheral portion of the lower sliding member of the support holding portion.   The thin sliding bearing device for a structure according to claim 2 or 3, wherein a plurality of through holes are formed in the buffer rubber.   The thin sliding bearing device for a structure according to any one of claims 1 to 4, wherein the rubber layer and the lower sliding member are integrated by vulcanization integral molding.   The mounting holding portion is formed on the support holding member, and after fixing with a mounting bolt of the support holding member, the upper end position of the mounting bolt is positioned below the upper surface of the support holding member. The thin sliding bearing device for a structure according to any one of 5.

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