JP3871393B2 - Insulating support device and seismic isolation structure using this support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses an orthogonal cross-type insulating support device having an insulating means for supporting a structure with a rolling support on the foundation or directly below the floor and insulating the influence of external vibrations on the upper or directly upper floor, and the support device. Related to seismic isolation structures.
[0002]
[Prior art]
In general, a seismic isolation structure support device is usually composed of laminated rubber, a friction slide, or the like. However, this type of support device requires a relatively high hardness for supporting the structure. For this reason, the natural period of the structure could not be set to a sufficiently long period necessary for base isolation, and the desired base isolation effect was not achieved.
[0003]
In addition, the conventional seismic isolation structure for laminated rubber-based seismic isolation devices is forced to be designed so that twisting does not occur as much as possible because resistance to torsional vibration is small. That is, it is recommended that the eccentricity R of the seismic isolation floor is 0.02. Therefore, when the upper structure is irregular, for example, a U-shape or an L-shape, it is necessary to construct each building separately, and a design for convection against mutual deformation must be performed.
[0004]
Furthermore, the conventional seismic isolation structure of the laminated rubber-based seismic isolation device has almost no resistance to pulling and lifting. That is, for cracking / breaking of the rubber layer, it is necessary to devise a design to keep the pulling force at E / ² to E = 7 to 13 kg / cm ² or less. Therefore, it is unsuitable for use in slender Noppo Buildings, tower-like structures, and lightweight buildings, and has been regarded as a limit point of applications. For this reason, the use method limited to application to heavy structures of about 3 to 15 stories is common.
[0005]
Moreover, in the conventional seismic isolation structure of the laminated rubber-based seismic isolation device, the period extension is about 3 seconds even during a large earthquake, and the effect of reducing the response acceleration cannot be greatly expected. This is due to the properties of laminated rubber bearings, i.e. high surface pressure, i.e. heavy loads on small diameter devices, are required to extend the period, while high surface pressure is At large deformations, there is a risk of inducing a “buckling” phenomenon of the device. For these reasons, the main focus is on adaptation to heavy structures of about 3 to 15 stories.
[0006]
Therefore, a linear motion support device has been proposed as a seismic isolation means in place of the laminated rubber (JP-A-8-240033).
[0007]
That is, in FIGS. 13 and 14, the linear motion support device 10 blocks the rolling rails 16 and 18 fixed to the foundation 12 and the structure 14 via spherical or cylindrical rolling elements 20. The blocks 22 and 24 are connected to the bodies 22 and 24 so as to be rotatable, and the block bodies 22 and 24 are coupled so as to be orthogonal to each other. By using such a linear motion support device 10 alone or together with a restoring device 25 such as a laminated rubber body and a damping device 27 such as a viscous damper, the mutual movement of the structure 14 relative to the foundation 12 is as low as possible. Therefore, the vibration transmission from the foundation 12 can be effectively cut off.
[0008]
[Problems to be solved by the invention]
The mutual free movement between the structure and the foundation in the linear motion support device depends on the mounting level of the foundation and the rolling rail with respect to the vertical axis Z, that is, the mounting accuracy of the support device. In other words, if the level is not achieved, horizontal shear stresses (internal stresses) fx and fy in the direction of the rolling rail are generated inside the support device during mutual free movement, thereby hindering the mutual free movement. For this reason, there is a difficulty that the vibration transmission from the foundation to the base-isolated structure is not cut off. In addition, this problem is that when a torsion phenomenon or the like occurs in a seismic isolation structure, particularly an irregular shape or a long and narrow building, a rotational torsional force fm is further generated inside the linear motion support device in addition to the horizontal shear stresses fx and fy. As it was triggered, it was further amplified.
[0009]
Accordingly, an object of the present invention is to provide an insulated linear motion support device capable of sufficiently achieving a vibration isolation and seismic isolation effect regardless of errors in mounting accuracy of the linear motion support device and occurrence of a twisting phenomenon of the structure, and The object is to provide a seismic isolation structure using this support device.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, an insulating support device according to the present invention includes at least one linear first rolling rail fixed to a foundation and provided with a mounting level with respect to a vertical axis, and a structure. At least one linear second rolling rail having a mounting level with respect to a vertical axis fixed to an object and extending in a direction different from the first rolling rail, and the first and first A rolling member slidably connected to the two rolling rails, the rolling member being slidably connected to the first rolling rail via a first rolling element. A first block body, a second block body slidably connected to the second rolling rail via a second rolling element, and interposed between the first and second block bodies. A buffer body as an insulating means, and the buffer body is formed of a molded body or an enclosure of an elastic-plastic material. A pad structure in which a layer or a laminate is fixed between two hard members, and each of the hard members is provided with a plurality of fixing tool insertion holes, and compressive or tensile axial force and horizontal shearing. Even if force is applied, it does not fall off and has a mounting level with respect to the vertical axis.
[0012]
Further, the insulating means is constituted by a buffer body, and this buffer body is formed as a pad by adhering a single layer or a laminate of an elastic-plastic material or an enclosure between two hard members. This buffer is configured as a rectangular pad or a ring pad.
[0013]
Planar rotating body, outer ring and consists an inner ring rotatably supported via a are surrounded by the outer ring and which rolling element, the planar rotating body, rolling the annular groove and the outer ring having an annular groove A planar rotating body comprising an outer ring and an inner ring that is surrounded by the outer ring and rotatably supports the outer ring via a rotator;
A pad structure attached to at least one of the first and second planes of the plane rotating body, wherein the pad structure is formed of an elastic-plastic material molded body or a single layer or a laminate of inclusions. It has the structure fixed between these members.
[0014]
Further, the pad structure is configured as a rectangular pad or a link pad, and a plurality of fixture insertion holes are formed in each of the hard members, and further , a seismic isolation structure having the insulating support device is configured. You can also.
[0015]
Further, the seismic isolation structure has an attenuation device and a restoring device in addition to the insulating support device.
[0016]
When the insulated linear motion support device according to the present invention is applied to a base-isolated structure, horizontal shear or vertical in the interior due to an error in its mounting accuracy, a twisting phenomenon of the base-isolated structure, or an error in base-isolating accuracy. Even if an internal stress such as torsion occurs, the internal stress is sufficiently absorbed by the installed insulating means, and the vibration transmission from the foundation to the seismic isolation structure is effectively cut off.
[0017]
【Example】
Next, embodiments of an insulating support device and a seismic isolation structure using the support device according to the present invention will be described in detail below with reference to the accompanying drawings.
[0018]
In FIG. 1 and FIG. 2, first, an insulated linear motion support device 26 according to the present invention is basically a linear motion support device that rolls and supports a structure on a foundation. An insulating means 28 is provided for insulating the influence of the vibration on the structure side on the upper structure side.
[0019]
That is, the insulating linear motion support device 26 has spherical or cylindrical rolling elements 38 formed by engraving longitudinal grooves 34 and 36 on the rolling rails 30 and 32 respectively fixed to the foundation and the structure. Further, the rolling rails 30 and 32 are connected to the block bodies 40 and 42 so as to be freely rotatable, and the block bodies 40 and 42 are butt-coupled so as to be orthogonal to each other. The insulating means 28 is interposed between the block bodies 40 and 42.
[0020]
The coupling combination of the rolling rail and the block body can be changed in many designs, as shown in FIGS. 2a and 2b, a flat rolling surface type using a spherical rolling element 44, and a circle shown in FIG. 2c. An arc-shaped rolling surface type and a polygonal rolling surface type shown in FIG. 2d or a flat rolling surface type using a spherical and cylindrical rolling element 46 shown in FIG. 2e can be used.
[0021]
Further, the type of the insulation linear motion support device itself is, for example, as shown in FIG. 3a in addition to the cross type consisting of rolling rails 30 and 32 fixed to a single foundation and a structure shown in FIG. As shown in FIG. 3b, a K-shaped configuration comprising two rolling rails 48, 50 fixed to two foundations and one rolling rail 52 fixed to a single structure. As shown, it can be configured in a cross-girder form or the like comprising rolling rails 52, 54 and 56, 58 fixed to two foundations and structures, respectively. These types of insulation linear motion support devices can be designed in a wide range from a low load of several tens of kilograms to a high load of several thousand tons, depending on the application. is there.
[0022]
Since the spherical or cylindrical steel rolling element rotates while circulating in the rolling block during an earthquake, it can be driven with extremely low frictional resistance. The dynamic friction coefficient is as small as μ = 0.003 to 0.012, and the dynamic characteristic is 1/10 to 1/20 of the dynamic friction coefficient of a conventional seismic isolation device using slip. In addition, the spherical or cylindrical steel rolling element can be resisted in the reverse radial (pull) direction by being disposed on the side surface of the rolling rail. Therefore, the structure in which this device is installed becomes a structure with an infinite cycle, and the restoring force characteristics given by the coil spring and the conventional laminated rubber bearings, viscous dampers, high damping rubber, lead plugs in laminated rubber containing lead A seismic isolation structure having a very long period (T ≧ 4 seconds), which could not be achieved in the past, can be easily realized, and a further response reduction effect can be exhibited.
[0023]
Next, the insulating means 28 in the insulating linear motion support device according to the present invention will be described with reference to FIG. 4. The insulating means comprises a buffer body 60, and the buffer body 60 is made of natural rubber or high damping rubber. An intermediate body composed of a molded single-layer body 62 (FIGS. 4a and c) or a multilayer body 64 (FIG. 4b) of an elastic-plastic material or the like, or an encapsulating bag body 66 (FIG. 4d) of a fluid or powder or a granular material. A pad structure is formed by firmly bonding the two mounting plates 68 and 70 made of steel or hard plastic by vulcanization bonding or the like. The mounting plates 68 and 70 are provided with bolt through holes 72 so that the shock absorber 60 can be easily attached to the blocks 40 and 42 and compressed into the insulating linear motion support device. Even if axial tension and horizontal shearing force are applied, the intended purpose can be achieved without dropping. Although the illustrated mounting plate is formed in a rectangular shape, it may be formed in a circular shape as shown in FIGS.
[0024]
When the insulation linear motion support device of the present invention is applied to a seismic isolation structure, even if the mounting accuracy is not sufficient and an internal stress such as a horizontal shearing force is generated therein, the internal stress is Absorption is eliminated by the insulating means, that is, the buffer, and when an external force such as an earthquake is applied, the function as a seismic isolation device is quickly exhibited. Therefore, the vibration transmission from the foundation to the seismic isolation structure is blocked. And this buffer body fulfill | performs an effective absorption function not only with respect to a horizontal shearing force but with respect to a vertical vibration or a twist phenomenon.
[0025]
However, there is a limit to the ability to allow the rotation especially with respect to the rotation about the vertical axis. In this case, when applied to a structure where torsional vibration due to irregularities in the upper structure is likely to occur, there is a risk that the device will be damaged due to large stress, and the reverse due to torsional resistance. Response occurs in the superstructure, resulting in a loss of seismic isolation effect.
[0026]
FIG. 5 to FIG. 10 show another embodiment of the insulating means, that is, the buffer body used in the insulating linear motion support device according to the present invention.
[0027]
First, in FIG. 5, the shock absorber is composed of a plane rotating body 74 and is composed of an outer ring 76 and an inner ring 78, and an annular groove 80 is engraved on the inner side of the outer ring 76, while one outer ring of the inner ring is also annular. A groove 82 is formed to house the rolling element 84.
[0028]
Next, in the example of the plane rotating body 85 shown in FIG. 6, a plurality of annular grooves 88 are formed on the opposite side portion of the grooved outer ring 86, and a plurality of annular grooves corresponding to both opposite sides of the inner ring 90 are provided. 92 is engraved to house the rolling element 94.
[0029]
Further, the plane rotating body 96 shown in FIG. 7 has a structure shown in FIG. 4 on the upper surface of the outer ring 76 of the plane rotating body 74 shown in FIG. 5, and is formed in an annular shape shown in FIG. 98 is attached, and the shock absorber 100 is similarly attached to the lower surface of the inner ring 78.
[0030]
Further, similarly to the example shown in FIG. 7, the plane rotating body 102 shown in FIG. 8 is configured by attaching the buffer bodies 104 and 106 to the outer ring 86 and the inner ring 90 of the plane rotating body in FIG. 6, respectively. However, in the embodiment of FIGS. 7 and 8, the structure in which the shock absorber is attached to both the outer ring and the inner ring has been described. An effect is obtained.
[0031]
The shock absorbers 98 and 104 ensure the operational uncertainty and performance stability associated with the rotation of the installation site associated with the response during an earthquake and the horizontal level error during construction, and are indispensable functions for orthogonal crossing type seismic isolation devices. Have That is, if stress relaxation treatment is not performed, the operation becomes uncertain, the frictional characteristics of the device rises rapidly, and the function as a seismic isolation device is lost.
[0032]
In addition, a fixing tapped hole is formed in the outer ring and / or the inner ring of the plane rotating body, and is mounted between the block bodies 40 and 42 of the orthogonal linear motion support device 26 as shown in FIG.
[0033]
By using a plane rotating body, there is no resistance to torsion, that is, torque related to the vertical axis, and seismic isolation can be easily achieved regardless of the planar shape of the upper structure. In this case, as long as two or more orthogonal crossing type seismic isolation devices are installed, the upper and lower rolling rails orthogonally arranged from the geometric detection do not coincide with each other on a straight line. Therefore, even when the plane rotating body is mounted on the orthogonal crossing type insulation support device, the seismic isolation effect is exhibited against the earthquake motion from any direction.
[0034]
The insulation support device 26 according to the present invention configured as described above is arranged in a seismic isolation structure as shown in FIG. In the figure, reference numeral 108 denotes a cracked stone, and 110 denotes a pressure-resistant soil concrete. FIG. 12 is a plan view showing a state in which a large number of insulating support devices 26 according to the present invention are arranged in the seismic isolation structure. And although this insulation support apparatus 26 may be used independently, it uses together with the decompression | restoration apparatus 25 and the attenuation device 27 as mentioned above, and obtains a seismic isolation structure.
[0035]
【The invention's effect】
By using the insulating support device according to the present invention for a seismic isolation structure, the following effects can be obtained.
[0036]
{Circle around (1)} Torsional vibration can be allowed without causing stress to the member even if the torsional vibration and eccentricity are large with almost no resistance against torsion.
[0037]
{Circle around (2)} The inclination in the axial direction and the direction perpendicular to the axis can be relaxed by the rubber pad, and the frictional characteristics are not greatly changed and the friction coefficient is not increased.
[0038]
(3) Since it resists pulling, it can be applied to slender, tower-shaped, lightweight buildings.
[0039]
(4) With conventional laminated rubber bearings, it is possible to make seismic isolation of light-weight structures such as detached houses and lightweight steel structures, where seismic isolation is difficult.
[0040]
(5) Buildings on soft ground with long-period characteristics can be seismically isolated.
[0041]
(6) Periodic characteristics can be set freely and the period can be easily over 4 seconds.
[0042]
(7) A seismic isolation structure with a longer period can be realized, and the response reduction effect can be increased.
[0043]
(8) The degree of freedom in the plan of the superstructure can be increased.
[0044]
(9) Construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an insulated linear motion support device according to the present invention.
2 is a cross-sectional view showing a coupling combination of a rolling rail and a block body shown in FIG. 1, (a) is a cross-sectional view of a flat rolling surface type using a spherical rolling element, and (b) is another. (C) is a cross-sectional view of an arcuate rolling surface type, (d) is a cross-sectional view of a polygonal rolling surface type, and (e) is a spherical and cylindrical rolling element. It is sectional drawing of the flat rolling surface type | mold which used No ..
FIGS. 3A and 3B are perspective views showing another embodiment of the insulation linear motion support device according to the present invention, wherein FIG. 3A is a perspective view showing a combination with a K-shape, and FIG. 3B is a combination with a cross-beam type. It is a perspective view which shows a form.
FIG. 4 is a perspective view showing an embodiment of an insulating means (buffer body) of the insulation linear motion support device according to the present invention, and (a) is a perspective view of the buffer body using a single elastic-plastic material. (B) is a perspective view of a shock absorber using a plurality of elastic-plastic materials, (c) is a perspective view of a shock absorber using a single elastic-plastic material, and (d) uses an encapsulating bag. FIG.
FIG. 5 is a cross-sectional view of a plane rotating body type shock absorber used in the insulated linear motion support device according to the present invention.
FIG. 6 is a cross-sectional view of another planar rotating body.
7 is a cross-sectional view of the planar rotating body shown in FIG.
8 is a cross-sectional view of the plane rotator shown in FIG. 7 with a cushioning material attached.
FIG. 9 is a perspective view showing an annular buffer.
FIG. 10 is a plan perspective view showing a state in which an insulating support device made of a plane rotating body according to the present invention is mounted on an orthogonal linear motion device.
FIG. 11 is a cross-sectional view of an essential part showing a seismic isolation structure using an insulated linear motion support device according to the present invention.
FIG. 12 is a plan view showing a state in which a large number of insulating support devices according to the present invention are arranged in a seismic isolation structure.
FIG. 13 is a perspective view showing a conventional linear motion support device.
FIG. 14 is a cross-sectional view of an essential part showing a seismic isolation structure using a conventional linear motion support device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Linear motion support apparatus 12 Foundation 14 Structures 16, 18 Rolling rail 20 Roller elements 22, 24 Block body 26 Insulating linear motion support apparatus 28 Insulating means 30, 32 Rolling rail 34, 36 Groove 40, 42 Block body 44 Roller 46 Cylindrical roller 48, 50, Rolling rail 52, 54, 56, 58 Rolling rail 60 Buffer body 62 Molded single layer body 64 Multilayer body 66 Encapsulating bag body 68, 70 Mounting plate 72 Bolt penetration Hole 74 Planar rotator 76 Outer ring 78 Inner ring 80 Annular groove 82 Annular groove 84 Roller element 86 Groove type outer ring 88 Annular groove 90 Inner ring 92 Annular groove 94 Roller element 96 Planar rotator 98 Buffer body 100 Buffer body 102 Planar rotor 104 106 buffer

Claims (9)

At least one linear first rolling rail fixed relative to the foundation and having a mounting level with respect to the vertical axis;
At least one linear second rolling rail having a mounting level with respect to a vertical axis fixed to the structure and extending in a different direction from the first rolling rail;
A rolling member slidably coupled to the first and second rolling rails,
The rolling member includes a first block body slidably connected to the first rolling rail via a first rolling element, and a second block slidable to the second rolling rail. A second block body connected via a rolling element, and a buffer body as an insulating means interposed between the first and second block bodies,
The shock absorber has a pad structure in which a single layer or a laminate of an elastic-plastic material or an inclusion is fixed between two hard members, and each of the hard members has a plurality of fasteners inserted therethrough. Make a hole,
An insulating support device having a mounting level with respect to the vertical axis without falling off even when a compression or tension axial force and horizontal shearing force are applied.   The insulating support device according to claim 1, wherein the buffer is configured as a rectangular pad or a link pad.   The insulating support device according to claim 1, wherein the buffer body is a flat rotating body.   4. The insulating support device according to claim 3, wherein the planar rotating body includes an outer ring and an inner ring that is surrounded by the outer ring and rotatably supports the outer ring via a rolling element.   The insulating support device according to claim 3, wherein the planar rotating body includes an outer ring having an annular groove and an inner ring fitted into the annular groove via a rolling element. The shock absorber is a planar rotating body composed of an outer ring and an inner ring that is surrounded by the outer ring and rotatably supports the outer ring via a rolling element;
A pad structure attached to at least one of the first and second planes of the plane rotating body, wherein the pad structure is formed of an elastic-plastic material molded body or a single layer or a laminate of inclusions. The insulation support device according to claim 1, wherein the insulation support device has a structure fixed between the members.   The insulating support device according to claim 6, wherein the pad structure is configured as a rectangular pad or a link pad, and each of the hard members is provided with a plurality of fixture insertion holes.   A seismic isolation structure having the insulating support device according to any one of claims 1 to 6.   The seismic isolation device according to claim 8, wherein the seismic isolation structure includes a damping device and a restoring device in addition to the insulating support device.

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