JP2008127959A - Sliding base isolation bearing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding base isolation bearing structure, capable of exhibiting attenuating function through a simple structure with cost advantages. <P>SOLUTION: The structure comprises a linear lower sliding member 5 which is horizontally provided on the side of a lower structural part 2, and a linear upper sliding member 4 horizontally which is provided on the side of an upper structural part 3 so as to cross the lower sliding member 5, the upper sliding member 4 being slidably supported on the lower sliding member 5. The upper structural part 3 is formed of a steel-made frame, and the upper sliding member 4 is preferably provided on the lower surface side of inner beams except circumferential beams constituting the frame 3 while being turned in the extending direction of the inner beams. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sliding seismic isolation bearing structure.

  Conventionally, as shown in FIG. 5 (a), the horizontal lower rail member 51 provided on the lower structure member side and the horizontal rail member 51 provided on the upper structure member side in a direction crossing the lower rail member 51 are provided. At the intersection of the second rail member 52 and the two rail members 51, 52, the rail members 51, 52 are fitted to the rail members 51, 52 via bearing balls (not shown) so as to be movable along the rail members 51, 52. A cross linear type rolling support structure is provided, which includes a block 53. 53a and 53b are recesses for fitting, and are provided in the block 53.

Further, as shown in FIG. 5B, the slider 55 provided on the upper structure side is slidably supported on the receiving surface 54a of the plate-like receiving material 54 provided on the lower structure side. There is also a sliding seismic isolation structure.
Japanese Patent No. 3333420

  However, the cross linear type rolling support structure as described above has a problem that not only cannot the damping function be exhibited by itself, but also the structure is complicated and the cost is high.

  On the other hand, in the above-described sliding seismic isolation structure, since the slider 55 slides on the receiving surface 54a, the friction is attenuated. On the other hand, a large area of the receiving surface 54a is ensured in the horizontal two-dimensional direction. There is a problem that the cost of the receiving material 54 is high.

  In view of the above-described problems, the present invention provides a sliding seismic isolation structure that can exhibit a damping function and that can be realized with a simple structure and advantageously in terms of cost. Is an issue.

  The above problem is that a linear lower sliding material is horizontally provided on the lower structure part side, and a linear upper sliding material directed in a direction crossing the lower sliding material is provided horizontally on the upper structure part side. This is solved by a sliding seismic isolation bearing structure characterized in that the upper sliding member is slidably supported on the lower sliding member (first invention).

  In this sliding seismic isolation structure, a damping action by friction is performed by sliding the upper and lower sliding materials together during the seismic isolation, so that a damping function can be exhibited.

  In addition, since the upper and lower sliding materials are slidably supported on the lower sliding material by crossing the linear upper and lower sliding materials, the structure is simple and it is necessary to secure a wide bearing surface in two dimensions. In addition, a sliding seismic isolation structure can be manufactured and configured at low cost.

  In the first invention, the upper and lower sliding members are each composed of a combination of four surfaces, each having a face portion on the opposite side as a valley and a center portion in the width direction as a mountain. It is good to be made to slide, maintaining a surface contact state (2nd invention).

  In this structure, the upper and lower sliding materials slide while maintaining a surface contact state at all times during the seismic isolation, so that the bearing state can be stabilized and smooth sliding can be realized. Since the face portions of the sliding material facing each other have a trough at the center in the longitudinal direction, the restoring force works during the seismic isolation, and the restoring function can be exhibited.

  In the first and second aspects of the invention, the upper structure portion is a gantry, and the upper sliding member is provided on the lower surface portion of the beam constituting the gantry so as to face the extending direction of the beam, and the lower structure portion is It is good to consist of between concrete underfloor soils, and the lower sliding material is provided in the upper surface part between the underfloor soils (3rd invention).

  In this case, the position of the intersection of the upper and lower sliding materials during seismic isolation is always located on the lower surface side of the beam of the gantry, and the eccentric moment due to fulcrum movement can be processed by the gantry beam without relying on the upper sliding material. The upper sliding material can be protected, and the entire lower sliding material is also supported by the soil surface, and the eccentric moment due to fulcrum movement can be processed by the floor soil without relying on the lower sliding material, A mechanical advantage can be exhibited.

Further, in the first and second inventions, the upper structure portion is composed of a gantry in which inner beams are distributed in a lattice pattern inside a surrounding beam surrounding the outer periphery of the building. It is provided on the lower surface of the beam so as to face the direction in which the inner beam extends,
The lower structure portion may be composed of a concrete underfloor soil, and the lower sliding material may be provided on an upper surface portion between the underfloor soils (fourth invention).

  This structure can exhibit a mechanical advantage as in the third aspect of the invention, and the upper sliding member is provided on the lower surface portion of the inner beam excluding the surrounding beam of the gantry. Therefore, it is possible to prevent the lower sliding material provided in the case from protruding outward from the beam around the gantry, and it is possible to form a good fit state.

  In the third and fourth inventions, when the height dimension range of the gantry is the underfloor space part (fourth invention), the pipe from the roof is connected to the underfloor space part and the gantry existing in the height dimension range of the gantry. It can be extended to the outdoor side without depending on the mounting location on the soil surface, and the displacement absorption part at the time of seismic isolation of the pipe can also be installed on the outdoor side. It can be easily performed without being obstructed by the existence of the seismic isolation bearing using the underfloor space.

  Since the sliding seismic isolation structure of the present invention is as described above, it can exhibit a damping function, and can be realized with a simple structure and advantageously in terms of cost.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  In the sliding seismic isolation structure 1 according to the first embodiment shown in FIG. 1, reference numeral 2 denotes a concrete underfloor soil as a lower structure, 3 denotes a pedestal as an upper structure, and the lower surface of the pedestal 3 has a flat bottom surface. A strip-like linear upper sliding material 4 is horizontally provided in a fixed state, and the upper flat surface of the strip-like linear lower sliding material 5 oriented in a direction crossing the upper sliding material 4 is provided on the upper surface of the underfloor soil 2. Is provided horizontally in a fixed state, and the upper sliding member 4 is slidably supported on the lower sliding member 5 in a surface contact state.

  The gantry 3 is composed of a steel gantry using an H-shaped steel beam provided with upper and lower flanges and a web connecting these flanges, and the upper sliding material 4 has its longitudinal direction directed in the direction in which the H-shaped steel beam extends. , And the entire height range of the steel pedestal 3 is set as shown in FIG. 1 (b) so as to fall within the range of the lower surface of the H-shaped steel beam. 7 and so on.

  Note that the sliding surfaces of the upper and lower sliding members 4 and 5 may be formed of, for example, a PTFE sheet surface, a PTFE-based coating surface, a metal surface, or the like. Moreover, you may make it provide a rubber sheet and a felt sheet | seat as a non-land absorbing material.

  In the above-mentioned friction isolation bearing structure, during the isolation, the upper and lower linear sliding members 4 and 5 are caused by friction by sliding at their intersections as shown in FIGS. 2 (b), (c) and (d). Attenuating action is performed and a damping function can be exhibited.

  Moreover, since the structure is such that the linear upper and lower sliding members 4 and 5 are crossed and the upper sliding member 4 is slidably supported on the lower sliding member 5, the structure is simple and the bearing surface is wide in two dimensions. Therefore, it is possible to manufacture and configure the friction isolation bearing structure at a low cost while keeping the material cost low. Safety landing at excessive displacement can be realized and safe.

  In addition, since the upper sliding material 4 is directed in the extending direction of the beams constituting the gantry 3 and is provided on the lower surface portion thereof, the position of the intersection of the upper and lower sliding materials 4 and 5 always constitutes the gantry 3. Located on the lower surface side of the beam, the eccentric moment due to the movement of the fulcrum can be processed by the beam constituting the gantry 3 without relying on the upper sliding material 4, so that the upper sliding material 4 can be protected, and the lower sliding material 5 is supported by the upper surface of the concrete underfloor soil 2 as a whole, and the eccentric moment due to the movement of the fulcrum can be processed by the underfloor soil 2 without relying on the undersliding material 5, and exhibits a mechanical advantage. can do.

  In addition, since the height dimension range of the steel pedestal 3 is the underfloor space portion 7, piping (not shown) from the shed 6 uses the underfloor space portion 7 and the pedestal 3 existing in the height dimension range of the gantry 3. In addition, it can be extended to the outdoor side without depending on the mounting location on the surface between the underfloor soils 2, and it is also possible to install the displacement absorption part at the time of the seismic isolation of the pipe on the outdoor side. The base 3 and the underfloor space 7 can be used easily without being obstructed by the existence of the seismic isolation bearings 4 and 5.

  In the second embodiment shown in FIG. 3, the gantry 3 is a steel gantry in which inner beams 3a made of H-shaped steel or the like are passed in a lattice pattern inside a surrounding beam 3b made of H-shaped steel or the like surrounding the outer periphery of the building. The upper sliding member 4 is provided on the lower surface portion of the inner beam 3a excluding the surrounding beams 3b in a lattice shape so that the vertical and horizontal beams constituting the inner beam 3a extend in the lattice shape. A structure in which a plurality of portions in the middle of the longitudinal direction of each of the surrounding linear upper sliding material portions are supported at the center in the longitudinal direction of the plurality of lower sliding materials 5 provided on the upper surface of the underfloor soil 2 and It has become. The height dimension range of the steel pedestal 3 is set as the underfloor space as in the case of the first embodiment.

  In this sliding seismic isolation structure, not only can the mechanical advantage be exhibited for the same reason as in the first embodiment, but the upper sliding member 4 is an inner beam excluding the peripheral beam 3 b of the gantry 3. Since it is provided on the lower surface side of 3a, it is possible to prevent the downsliding material 5 provided in the underfloor soil 2 from projecting to the outside of the surrounding beam 3b of the steel pedestal 3, for example, on the outer peripheral side of the building The water draining structure can be simplified, and a good fit state can be formed.

  In the third embodiment shown in FIG. 4, as the upper and lower linear sliding materials 4, 5, the surfaces facing each other have four surfaces with the central side in the longitudinal direction as a valley and the central side in the width direction as a mountain. 4a, 4b, 4c, 4d; composed of a combination of 5a, 5b, 5c, 5d so that the first and second sliding members 4, 5 can always slide while maintaining a surface contact state during the seismic isolation. Has been made. Others are the same as in the first embodiment.

  That is, as shown in FIG. 4 (d), the surfaces 4a, 4b, 4c, 4d of the upper sliding material 4 and the surfaces 5a, 5b, 5c, 5d of the lower sliding material are surfaces during standby other than during the seismic isolation. Maintain contact. Further, at the time of relative displacement in the X-axis direction, the surfaces 4a and 4c of the upper sliding material 4 and the surfaces 5c and 5d of the lower sliding material or the surfaces 4b and 4d of the upper sliding material 4 and the surfaces 5a and 5b of the lower sliding material 5 Maintain surface contact. At the time of relative displacement in the Y-axis direction, the surfaces 4a and 4b of the upper sliding material 4 and the surfaces 5a and 5c of the lower sliding material 5 or the surfaces 4c and 4d of the upper sliding material 4 and the surfaces 5b and 5d of the lower sliding material 5 Maintain surface contact. Further, at the time of the synthetic relative displacement in the X-axis direction and the Y-axis direction, the surface 4a of the upper sliding member 4 and the surface 5c of the lower sliding member 5, or the surface 4b of the upper sliding member 4 and the surface 5a of the lower sliding member 5, or The surface 4c of the upper sliding material 4 and the surface 5d of the lower sliding material 5 or the surface 4d of the upper sliding material 4 and the surface 5b of the lower sliding material 5 maintain a surface contact state.

  Thus, in the above structure, the upper and lower sliding members 4 and 5 always slide while maintaining the surface contact state during the seismic isolation, so that the supporting state can be stabilized and smooth sliding can be realized. In addition, since the face portions of the upper and lower sliding materials 4 and 5 facing each other have a valley at the center in the longitudinal direction, a restoring force is exerted during the seismic isolation, and a restoring function can also be exhibited. The structure of the third embodiment can be used in the structure of the second embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a sliding seismic isolation structure of a first embodiment, in which FIG. (A) is a partially sectional perspective view, and (b) is a partially sectional front view. FIG. 1A is a plan view of the bearing structure, and FIGS. 2B to 2D are plan views showing examples of seismic isolation operation states. It is a top view which shows the sliding seismic isolation bearing structure of 2nd Embodiment. FIG. 7 shows a sliding seismic isolation structure according to a third embodiment. FIG. (A) is a partially sectional front view, (B) is a perspective view, and (C) is a perspective view in which upper and lower sliding materials are separated. (D) is a plan view of the intersection of the upper and lower sliding materials during standby other than during seismic isolation. FIGS. 1A and 1B are perspective views showing a conventional seismic isolation bearing structure, respectively.

Explanation of symbols

1 ... Slip-isolated bearing structure 2 ... Underfloor soil (lower structure)
3 ... Stand (superstructure)
3a ... Inner beam 3b ... Peripheral beam 4 ... Linear upper sliding material 4a, 4b, 4c, 4d ... Four surfaces 5 ... Linear lower sliding material 5a, 5b, 5c, 5d ... Four surfaces 7 ... Underfloor space

Claims (5)

  A linear lower sliding material is horizontally provided on the lower structure side, and a linear upper sliding material oriented in a direction crossing the lower sliding material is horizontally provided on the upper structure side. A sliding seismic isolation bearing structure characterized by being slidably supported on the lower sliding material.   Each of the upper and lower sliding materials is composed of a combination of four surfaces, each having a face portion on the opposite side as a valley and a central portion in the width direction as a mountain, and always has a surface contact state during seismic isolation. The sliding seismic isolation structure according to claim 1, wherein the sliding isolation bearing structure is adapted to slide while maintaining.   The upper structure part is composed of a gantry, and the upper sliding material is provided on the lower surface part of the beam constituting the gantry so as to be directed in the extending direction of the beam, and the lower structure part is composed of a concrete under-floor soil, The sliding seismic isolation structure according to claim 1 or 2, wherein the lower sliding material is provided on an upper surface portion between the underfloor soils. The upper structure part is composed of a gantry in which inner beams are distributed in a lattice pattern inside a surrounding beam surrounding the outer periphery of the building, and the upper sliding material is formed on the lower surface of the inner beam excluding the surrounding beam of the gantry. Is oriented in the extending direction of
3. The sliding seismic isolation bearing structure according to claim 1, wherein the lower structure portion is made of a concrete underfloor soil, and the lower sliding material is provided on an upper surface portion between the underfloor soils.   The sliding seismic isolation structure according to claim 3 or 4, wherein a height dimension range of the frame is an underfloor space.

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