JP2011021727A - Base isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple base isolation structure with less dispersion of restoring force. <P>SOLUTION: A support rod 11 includes an extensible support rod body 12, and a coil spring that stores energy by the extension of the support rod body 12 and contracts the support rod body 12 with the stored energy. The lower ends of a pair of support rods 11, 11 are connected in a swingable manner to a foundation 3 at a space, and the upper ends which are the other ends of the pair of support rods 11, 11 are connected in a swingable manner to a building at a space narrower than the lower end space. When a building moves to one support rod 11 side due to an earthquake, the one support rod 11 is rotated to one side without extending, and the other support rod 11 is rotated to the one side while extending. The coil spring of the other extended support rod 11 is compressed to store energy to absorb vibrational energy. Since both support rods 11, 11 are rotated at a predetermined angle with a predetermined length in the contracted state of at least one of the support rods, the load of the building can be supported. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seismic isolation structure for a supported body such as a building supported by a foundation.

  The conventional laminated rubber-based seismic isolation device has a variation in rigidity of about 20% due to the material characteristics of the laminated rubber, and gives an error in the response of the building. On the other hand, a seismic isolation device using a sliding bearing requires a spring for restoring force and a damper for damping force.

  In addition, a spherical contact type rotary sliding bearing body capable of omnidirectional horizontal displacement and rotation and a seismic isolation structure in which the bearing body is embedded in a pile head (for example, Patent Document 1) have been proposed.

JP 2008-144562 A

  Even in the seismic isolation structure of Patent Document 1, a laminated rubber-based rigid member is required separately from the support body, and there is a problem that the structure is complicated and costs are increased.

  Accordingly, the present invention has been made in consideration of the above problems, and an object thereof is to provide a simple seismic isolation structure with little variation in restoring force.

  The seismic isolation structure of the present invention is a seismic isolation device provided between a supported body and a foundation that supports the supported body, and a support rod body that can extend and contract against a compressive force at a predetermined length; Using a support rod having energy storage conversion means for storing energy by stretching of the main body and contracting the support body by the stored energy, the support rod having a pair is provided, and one end of the pair of support rods is provided. The other end of the pair of support rods is swingably connected to the supported body at a distance narrower than the distance between the one ends. .

  As a result, when the supported body moves to one support rod side due to an earthquake, one support rod rotates to one side without stretching, and the other support rod rotates to one side while stretching, and the other stretched The energy storage conversion means of the supporting rod absorbs energy by absorbing energy, and then the other supporting rod rotates to the other side while conversely contracting, and the one supporting rod rotates to the other side. When returning to the initial position, one support rod rotates while extending, and the energy storage conversion means of one of the extended support rods stores the energy to absorb the vibration energy, and repeats this to seismically isolate it. An effect is obtained. In addition, since at least one of the support rods rotates by a predetermined angle with a contracted length, the load of the supported body can be supported.

  Moreover, the seismic isolation structure of the present invention is characterized in that the support rod includes vibration damping means for damping the vibration of the supported body.

  Thereby, when a support rod expands and contracts at the time of an earthquake, the energy can be absorbed and the vibration of the supported body can be attenuated.

  Further, the seismic isolation structure of the present invention includes three or more support rods, and one end of the plurality of support rods is swingably coupled to the foundation at a vertex position of a polygon corresponding to the number of the support rods. The other ends of the plurality of support rods are swingably connected to the supported body at the polygonal center position.

  In the event of an earthquake, the three support rods oscillate, and at least one support rod rotates at a predetermined length during the swinging, and at least one support rod rotates while being stretched, thereby providing seismic isolation. An effect can be obtained.

  Moreover, the seismic isolation structure of the present invention is characterized in that the support rod main body resists a tensile force after extending to a certain length.

  Explaining using a pair of support rods as a model, when a supported body moves to one support rod side due to an earthquake, one support rod rotates to one side without stretching, while the other support rod extends If it rotates to one side and this other support rod rotates to a certain length, the other support rod opposes the tensile force, thereby preventing further rotation to one side.

  According to the seismic isolation structure of the present invention, it is possible to support the supported body and absorb the energy at the time of displacement by the support rod, and it is possible to provide a seismic isolation structure that is simple in structure and excellent in mass production effect.

It is explanatory drawing of the seismic isolation structure which shows Example 1 of this invention. It is explanatory drawing from which a connection location by the side of a to-be-supported body is different from the above. FIG. 3 is a cross-sectional view of the support rod. It is a schematic perspective view of a seismic isolation structure same as the above. It is a schematic top view of a seismic isolation structure same as the above. It is a schematic plan view from which the arrangement | positioning of the support rod of a seismic isolation structure differs as above. It is a schematic perspective view of the seismic isolation structure which shows Example 2 of this invention. It is a schematic top view of a seismic isolation structure same as the above. It is a schematic plan view of the seismic isolation structure from which the connection location by the side of a to-be-supported body is different from the above. It is a schematic perspective view of the seismic isolation structure which shows Example 3 of this invention. It is a schematic top view of a seismic isolation structure same as the above.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, an unprecedented base isolation structure is obtained by adopting a new base isolation structure different from the conventional one, and the base isolation structure will be described.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIGS. 1-6 shows Example 1 of this invention, and the seismic isolation apparatus 1 is provided between the building 2 which is a to-be-supported body, and the foundation 3 which supports this building 2, and at least makes a pair of support rods. 11 and 11 are provided.

  As shown in FIG. 3, the support rod 11 includes a support rod main body 12 that can be expanded and contracted. The support rod main body 12 includes a cylindrical case 13 and a rod-shaped extendable rod 14 inserted into the cylindrical case 13. The support rod 11 expands and contracts when the telescopic rod 14 moves in the length direction of the cylindrical case 13.

  A compression coil spring 15 is provided in the cylindrical case 13 to be contracted by the extension of the support rod 11, and this coil spring 15 is energy storage conversion means. When the coil spring 15 contracts, kinetic energy is accumulated, and when the coil spring 15 is compressed, the support rod 11 does not extend any more and is configured to resist the tensile force. In addition, the compressed coil spring 15 releases the accumulated kinetic energy as an elastic restoring force, and the support rod 11 contracts when the confidence is expanded. Further, when the support rod 11 is engaged with the cylindrical case 13 at a predetermined length in the contracted state (initial state) of the support rod 11, the support rod 11 opposes the compressive force and further contracts. There is no.

  Further, the support rod 11 is provided with a damper mechanism 16 as a vibration damping means as energy absorbing means, and this damper mechanism 16 absorbs energy when the support rod main body 12 is expanded and contracted using a viscous fluid. In this case, the one that absorbs the vibration of the building 2 and attenuates the vibration of the building 2 is used.

  Both ends of the support rod 11 are connected to the building 2 and the foundation 3 by a ball joint 21 so as to be capable of rotating 360 degrees. The ball joint 21 includes a sphere 22 provided at the ends of the cylindrical case 13 and the telescopic rod 14 and a holder 23 that rotatably holds the sphere 22. The holder 23 is fixed to the building 2 and the foundation 3. Established.

  Next, the seismic isolation action by the pair of support rods 11 and 11 will be described. In the explanatory view of FIG. 1, the pair of supporting rods 11 and 11 are arranged at the hypotenuse side of the triangle, and the lower portions of the supporting rods 11 and 11 are arranged at intervals on the foundation 3, and this interval is the base of the triangle. The half of the bottom length corresponds to the required distance L for seismic isolation. The rotation center points P and Q at the lower ends of the support rods 11 and 11 are the rotation centers of the ball joint 21. The upper ends of the pair of support rods 11 and 11 are also connected to the building 2 by the ball joint 21, but for the sake of easy explanation, the crossing position of the upper ends of the support rods 11 and 11 is defined as a neutral point K. At the point K, the upper ends of the support rods 11 and 11 are connected to the building 2 so as to be able to rotate 360 degrees.

  Hereinafter, description will be made assuming that the support rods 11 and 11 operate in two dimensions including them. The support rod 11 includes the damper mechanism 16 as described above, and has a structure that does not shrink from the initial length. When the support rods 11 and 11 rotate to one side (right side in the figure) and move from the neutral point K to the neutral point K ′, the supported building 2 is supported by the one side support rod 11. The restoring force at this time is generated by a reaction due to the supported building 2 rising from the neutral point K to K ′. In order to adjust the restoring force, as described above, the coil springs 15 are provided on the support rods 11 and 11.

  When the support rods 11 and 11 rotate to the other side (left side in the figure) and move from the neutral point K to the neutral point K ″, the supported building 2 is supported by the support rod 11 on the other side. At this time, the support rod 11 on one side functions as a damper and extends like a neutral point K ″ —rotation center point P.

  Moreover, as shown in FIG. 2, you may connect with the building 2 at intervals, without crossing the other end of the support rods 11 and 11. FIG. In addition, the space | interval of the said other end is narrower than the space | interval between the said one ends corresponding to the base of a triangle. In this case, the required distance L corresponds to the horizontal distance between the upper end position in the initial state and the rotation center points P and Q.

  When using the seismic isolation structure comprising the pair of support rods 11 and 11, as shown in FIGS. 4 to 6, at least two pairs of support rods 11 and 11 are prepared, and between the two ends of the two sets 4 and FIG. 5, the X direction is between one end of the support rods 11, 11 forming one pair, and the other end of the support rods 11, 11 forming the other pair in FIGS. The extension between the ends of the support rods 11 and 11 forming one pair and the extension between the one ends of the support rods 11 and 11 forming the other pair are orthogonal to each other. Further, in FIG. 6, one pair of support rods 11, 11 are arranged in the X direction and the other end of the other pair of support rods 11, 11 are arranged in the Y direction to form one pair. In the center between the ends of the support rods 11 and 11, an extension between one end of the support rods 11 and 11 forming one pair and an extension between the ends of the support rods 11 and 11 forming the other pair are orthogonal to each other.

  As described above, in this embodiment, in the seismic isolation device provided between the building 2 as the support body and the foundation 3 that supports the building 2, the support rod body 12 that can extend and contract against the compressive force with a predetermined length; A pair of support rods 11, 11 are used, using a support rod 11 having a coil spring 15 as energy storage conversion means for storing energy by stretching the support rod body 12 and contracting the support body 12 by the stored energy, The lower end, which is one end of the pair of support rods 11, 11 is slidably connected to the foundation 3 at an interval, and the upper end, which is the other end of the pair of support rods 11, 11, is narrower than the interval between the lower ends. Since the building 2 is pivotably connected to the building 2 at intervals, when the building 2 moves to one support rod 11 side due to an earthquake, one support rod 11 rotates to one side without stretching, and the other support rod 11 One side while stretching The coil spring 15 of the other support rod 11 that is rolled and stretched is compressed to store energy, so that vibration energy is absorbed. Next, the other support rod 11 rotates to the other side while contracting. When the support rod 11 rotates to the other side and returns to the initial position, one support rod 11 rotates while extending, and the coil spring 15 of the extended one support rod 11 stores energy, thereby absorbing vibration energy. By repeating this, the seismic isolation effect can be obtained. Further, since at least one of the support rods 11 and 11 rotates at a predetermined angle with a contracted length, the load of the building 2 can be supported.

  As described above, in this embodiment, the support rod 11 includes the damper mechanism 16 that is a vibration attenuating means for attenuating the vibration of the building 2 that is a supported body. Therefore, when the support rod main body 12 expands and contracts during an earthquake, energy absorption is performed. The damper mechanism 16 as a means can absorb the expansion and contraction energy and attenuate the vibration of the building 2.

  Further, in this embodiment, since the support rod main body 12 stretches to a certain length and then resists the tensile force, the explanation will be given by using the pair of support rods 11 and 11 as a model. When moving to one support rod 11 side, one support rod 11 rotates to one side without extending, the other support rod 11 rotates to one side while extending, and the other support rod 11 is fixed length. When the other support rod 11 is rotated, the other support rod 11 is prevented from rotating further to one side by resisting the tensile force, and thereafter, it is returned to the opposite direction by the elastic restoring force of the coil spring 15. it can.

  7 to 9 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, the three support rods 11, 11, 11 are used, and the lower ends, which are one ends of the support rods 11, 11, 11, are connected to the base 3 at the apex position of the triangle by the ball joint 21, and these support rods are supported. The upper end, which is the other end of the eaves 11, 11, 11, is connected to the building 2 by the ball joint 21 at the central position of the triangle. A triangular pyramid is formed by the three support rods 11, 11, 11 having the same length and a part of the base 3.

  7 and 8, for the sake of explanation, the upper ends, which are the other ends of the three support rods 11, 11, 11 are crossed and illustrated, but the upper ends are separated as shown in FIG. In this case, in an initial state before all the support rods 11, 11, 11 are extended, the upper ends of all the support rods 11, 11, 11 are located inside the triangle, in other words, all the support rods. 11, 11 and 11 have their upper ends inclined toward the center of the triangle.

  As described above, in this embodiment, the support rods 11, 11, 11 are provided with three or more (N or more: N is a natural number of 3 or more), and one end of the plurality of support rods 11, 11, 11 is provided on the support rod 11. , 11, 11 are pivotally connected to the foundation 3 at the apex position of a triangle (N-gon) which is a polygon corresponding to the number of the support rods 11, and the other ends of the plurality of support rods 11, 11, 11 are positioned at the center side of the triangle. In this case, the three support rods 11, 11, 11 are swung during an earthquake, and at least one support rod 11 has a predetermined length. And at least one supporting rod 11 rotates while being stretched, whereby an excellent seismic isolation effect can be obtained.

  10 and 11 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, the four support rods 11, 11, 11, 11 are used, and a substantially quadrangular pyramid is formed by the four support rods 11, 11, 11, 11 and a part of the foundation 2. Four support rods 11, 11, 11, 11 are arranged.

  Thus, also in this embodiment, there are four support rods 11, 11, 11, 11 that are three or more, and one end of the plurality of support rods 11, 11, 11, 11 is connected to the support rods 11, 11, 11, 11 and 11 are pivotally connected to the base 3 at the vertex positions of a quadrilateral polygon, and the other ends of the plurality of support rods 11, 11, 11, 11 are supported at the center position of the quadrilateral. Since it is connected to the body building 2 so as to be swingable, the same operations and effects as the above-described embodiments can be obtained.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible. For example, in the embodiment, the compression coil spring is exemplified as the energy storage conversion means. However, various types such as a tension coil spring and a device using liquid pressure can be used. Contrary to the embodiment, the support rod may be provided with a telescopic rod on one end side and a cylindrical case on the other end side. Further, in the embodiment, a triangular pyramid type using three support rods and a quadrangular pyramid type using four support rods are shown, but a type of five or more pentagonal pyramids or more may be used. In addition to the damper mechanism using the viscous fluid shown in the embodiment, various types of damper mechanisms such as one using friction can be used.

1 Seismic isolation device 2 Building (supported body)
3 foundation 11 support rod 12 support rod main body 13 cylindrical case 14 telescopic rod 15 coil spring (energy storage conversion means)
16 Damper mechanism (energy absorber)

Claims (4)

In the seismic isolation device provided between the supported body and the foundation that supports the supported body,
A support rod having a stretchable support rod body that opposes a compressive force at a predetermined length, and an energy storage conversion means that stores energy by stretching the support rod body and contracts the support body by the stored energy. Use
A pair of support rods, one end of the pair of support rods being pivotably connected to the foundation at a distance, and the other end of the pair of support rods being narrower than the distance between the one ends A seismic isolation device, wherein the seismic isolation device is swingably connected to the supported body at intervals. The seismic isolation device according to claim 1, wherein the support rod includes vibration attenuating means for attenuating vibration of the supported body. Three or more support rods are provided, and one ends of the plurality of support rods are swingably connected to the foundation at polygonal vertex positions corresponding to the number of the support rods, and the other ends of the plurality of support rods The seismic isolation device according to claim 1, wherein the seismic isolation device is swingably connected to the supported body at a center position of the polygon. The seismic isolation device according to any one of claims 1 to 3, wherein the support rod main body opposes a tensile force after extending to a certain length.

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