JP2007016390A - Base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation device having deformation performance, damping performance, axial force support performance, restoring performance and extraction resistant performance required for the base isolation device, and capable of stabilizing the performances. <P>SOLUTION: Mutual plane-like sliding parts 8 extended on a surface are allowed to abut on each other. A pair of units 2a and 2b of stacking and placing these sliding parts 8 by crossing at a substantially right angle, directly support a vertical load of an upper fixing object such as a building. Both units 2a and 2b allow displacement in the horizontal direction by vibration such as an earthquake by relatively linearly sliding in all directions of the horizontal direction. This vibrational energy is damped. Both engaging parts 6 and 6 of upper-lower end parts of a guide body 5 oppose extraction force by engaging with the units 2a and 2b. Coil springs 4 and 4 arranged on both sides of both these engaging parts 6 and 6 return the respective units 2a and 2b to a predetermined position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic isolation device, and more particularly, has a deformation performance, a damping performance, an axial force support performance, a restoration performance, and a pullout resistance performance required for the seismic isolation device, and is capable of stabilizing the performance. It relates to seismic devices.

  The seismic isolation device installed between the building and the foundation ground has deformation performance that allows horizontal displacement of vibration due to earthquake, etc., damping performance that attenuates this vibration energy, vertical load of buildings, etc. Axial force support performance to support is required as basic performance. In addition, for example, there is a need for a restoring performance for returning the displacement in the horizontal direction, and an anti-drawing performance that can withstand an upward pulling force generated when the upper building or the like is tilted.

  Conventionally, various seismic isolation devices have been proposed (see, for example, Patent Documents 1 and 2), but there are few that satisfy all the above-mentioned performances, and a device that complements any of the performances is installed separately. There was a need to do.

  As a seismic isolation device generally having the above-mentioned performance, there is one proposed in Patent Document 3, and an outline thereof is shown in FIG. FIG. 5 is a front view showing the internal structure through a part of the seismic isolation device 1, and FIG. 6 is a partially transparent plan view with the upper unit 2a of FIG. 5 removed.

  In this seismic isolation device 1, an upper unit 2a and a lower unit 2b arranged in a direction intersecting at a substantially right angle by a sliding body 11 are slidably connected, and both units 2a and 2b are attached to a mounting portion 9 by bolts or the like. Fixed to buildings and foundation ground. The sliding body 11 has sliding portions 11a at both upper and lower ends. The sliding portions 11a slide on the sliding portions 8 along the guide grooves 3 of the units 2a and 2b in the horizontal direction, and both units 2a. 2b is engaged so as to restrict the vertical movement of 2b. On both sides of the sliding body 11, leaf springs 10 that return the sliding body 11 to a predetermined position are disposed, and restoration performance is ensured.

However, in this proposal, the sliding position is two portions A separated in the vertical direction shown in FIG. 5, and the sliding body 11 is structured to support the axial force. In this case, there is a problem that the predetermined smooth sliding cannot be ensured due to lack of stability and slight inclination, and the above-described deformation performance, damping performance, and restoration performance cannot be obtained stably.
Japanese Patent Laid-Open No. 11-190390 JP-A-11-82621 JP 2000-192686 A

  An object of the present invention is to propose a seismic isolation device that has deformation performance, damping performance, axial force support performance, restoration performance, and pull-out resistance required for a seismic isolation device and can stabilize performance. is there.

  In order to achieve the above object, the seismic isolation device of the present invention is a seismic isolation device interposed between an upper fixed body and a lower fixed body, and is fixed to the respective fixed bodies and extends on the surface. A pair of units that are placed in contact with each other and intersecting each other at a substantially right angle, an upper end on the stacked upper unit, and a lower end on the lower unit Energizing means for restricting the vertical movement of the units by engaging the parts and having a guide body movable in the extending direction of the sliding part of each unit and returning the unit to a predetermined position in each unit Is provided.

According to the seismic isolation device of the present invention, the flat sliding portions fixed to the upper fixed body and the lower fixed body and extending on the surface are brought into contact with each other, and the sliding portions are substantially perpendicular to each other. By providing a pair of units stacked in an intersecting manner, both units can stably support the vertical load of the upper fixed body such as a building, and both units can slide relatively linearly. Horizontal displacement due to vibrations such as earthquakes can be allowed, and this vibration energy can be attenuated.
The guide body, which engages the upper unit with the upper unit and the lower unit with the lower unit, restrains the vertical movement of the units and opposes the pulling force acting in the direction of separating the units up and down. And excellent pull-out resistance.

Since the guide body can move in the extending direction of the sliding portion of each unit, both units can attenuate vibration energy while sliding in any direction in the horizontal direction.
Further, by providing an urging means for returning the unit to a predetermined position in each unit, both units displaced by vibration can be returned to a predetermined position (neutral state).

  As described above, the present invention has deformation performance, damping performance, axial force support performance, restoration performance, and pull-out resistance performance, and both units directly support the axial force by bringing the sliding portions into contact with each other. Therefore, the above-described deformation performance, damping performance, axial force support performance, and restoration performance can be stabilized.

  Hereinafter, the seismic isolation device of the present invention will be described based on the embodiments shown in the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the same component as a prior art example.

  FIG. 1 is a plan view of the seismic isolation device 1, and FIG. 2 is a front view showing the internal structure through a part thereof. FIG. 3 is a perspective view of the seismic isolation device 1 with the upper unit 2a described later removed.

  The seismic isolation device 1 includes a pair of elongated upper unit 2a and lower unit 2b, and a guide body 5 that engages with both units 2a and 2b. In this embodiment, both units 2a and 2b have the same specifications.

  The upper unit 2a is fixed to an upper fixed body such as a building by bolts or the like at the attachment portion 9, and the lower unit 2b is fixed to the lower fixed body such as a foundation ground in the same manner. It is interposed between the fixed bodies.

  On both surfaces of the units 2a and 2b, a flat sliding portion 8 is extended in the longitudinal direction of the units 2a and 2b, the sliding portions 8 are brought into contact with each other, and the sliding portions 8 intersect each other at a substantially right angle. Stacked to form a two-stage structure.

  The sliding portion 8 is made of, for example, a low-friction material such as fluororesin or silicon, and is used for one sliding portion 8 that comes into contact, and the other sliding portion 8 is a smooth rigid plate such as a steel plate. May be.

  As illustrated in FIG. 2, both the units 2 a and 2 b have guide grooves 3 extending in the longitudinal direction at the center in the width direction, with the longitudinal cross-sectional shape being C-shaped. Engaging portions 6 at both upper and lower ends connected by the connecting portion 7 of the guide body 5 are engaged with the guide groove 3.

  In the guide grooves 3 of both the units 2a and 2b, coil springs 4 are built in on both sides of the engaged engaging portion 6, and the engaging portion 6 is disposed at a predetermined position and is in a neutral state. The upper surface of the engaging portion 6 at the upper end portion of the guide body 5 and the upper unit 2a are in a non-contact state or slightly in contact with each other, and similarly, the lower surface of the engaging portion 6 at the lower end portion of the guide body 5 and the lower unit 2b. Is a non-contact state or a state of slight contact, and the guide body 5 has a structure that does not bear the vertical load of the upper fixed body, that is, does not support the axial force. Supported by units 2a, 2b.

  When the base ground to which the lower unit 2b is fixed is shaken by an earthquake or the like with the seismic isolation device 1 installed, the units 2a and 2b slide relative to each other. At this time, since the guide body 5 is movable in the extending direction (longitudinal direction) of the sliding portion 8 of each unit 2a, 2b, both units 2a, 2b are linear in all directions in the horizontal direction. It is possible to slide, and by this sliding, vibration displacement can be allowed and vibration energy can be attenuated.

  The two units 2 a and 2 b that have slid and shifted from the neutral state can return to a predetermined position (neutral state) when the guide body 5 is urged by the coil spring 4.

  The position of contact and sliding is A part shown in FIG. 2, and much more stable sliding is ensured as compared with the sliding position A part shown in FIG. With stable sliding, it becomes possible to stabilize horizontal deformation performance, damping performance, and restoration performance.

  In addition, when a pulling force that causes the two units 2a and 2b to separate up and down due to a tilt of the structure or the like to which the upper unit 2a is fixed is generated, the engaging portions 6 at the upper and lower ends of the guide body 5 are By engaging the respective units 2a and 2b, the pulling force can be counteracted, and excellent pulling resistance can be obtained.

  As described above, the main performance required for the seismic isolation can be covered by the seismic isolation device 1, and it is possible to eliminate the need for separately installing a device that complements the performance.

  Further, in the present invention, the coil spring 4 is built in the units 2a and 2b at the factory, etc., and the guide body 5 can be transported to the installation site after being assembled and engaged with the units 2a and 2b. Can be facilitated.

  In the embodiment, since the coil spring 4 is used as the urging means, the deformation performance, the damping performance, and the restoration performance that are easily required by changing the specifications of the coil diameter, winding pitch, material, etc. according to the required performance. Can be adjusted. In addition, as the urging means, a leaf spring, rubber or the like can be used.

  As shown in FIG. 4, when the corner portion C of the sliding portion 8 of both the units 2a and 2b is chamfered, the unit 2a and 2b can be smoothly slid to prevent catching and the like. More stable performance can be obtained. It is not limited to the smooth inclined chamfering as shown in the figure, and for example, it can be chamfered into an arc shape.

It is a top view which illustrates embodiment of the seismic isolation apparatus of this invention. It is a partially transparent front view of FIG. It is a perspective view of the state which removed the upper unit of FIG. It is a partially transparent front view which illustrates the corner | angular part of a sliding part. It is a partially transparent front view which illustrates the conventional seismic isolation apparatus. FIG. 6 is a partially transparent plan view of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2a Upper unit 2b Lower unit 3 Guide groove 4 Coil spring 5 Guide body 6 Engagement part 7 Connection part 8 Sliding part 9 Attachment part 10 Leaf spring 11 Sliding body 11a Sliding part

Claims (3)

  In the seismic isolation device interposed between the upper fixed body and the lower fixed body, the flat sliding portions fixed to the respective fixed bodies and extending on the surface are brought into contact with each other. A pair of units stacked at substantially right angles with the sliding portion and an upper end portion of the stacked upper unit and a lower end portion of the lower unit are engaged to restrict the vertical movement of the units. A seismic isolation device comprising a guide body movable in the extending direction of the sliding portion of each unit, and provided with a biasing means for returning the unit to a predetermined position in each unit.   The seismic isolation device according to claim 1, wherein the urging means is a coil spring disposed on both sides of the engaged end of the guide body. The seismic isolation device according to claim 1 or 2, wherein a corner portion of the sliding portion of the unit is chamfered.

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