WO2000031436A1

WO2000031436A1 - Seismic isolation device

Info

Publication number: WO2000031436A1
Application number: PCT/JP1999/006638
Authority: WO
Inventors: Hirokazu Matsukawa; Hiroshi Matsuoka; Ippei Ohta
Original assignee: Bando Chemical Industries, Ltd.
Priority date: 1998-11-26
Filing date: 1999-11-26
Publication date: 2000-06-02
Also published as: TW436563B

Abstract

A seismic isolation device (A) comprising a support (3) that supports an upper plate (1) for horizontal slide movement relative to a lower plate (2), and a rubber member (8) that elastically connects at least portions of the outer peripheries of the upper and lower plates (1, 2) so that it serves as an elastic body that will be deformed when the upper plate (1) is horizontally slid relative to the lower plate (2), wherein, in order to obtain satisfactory seismic isolation effects while reducing the horizontal dimension, the support (3) is made in the form of a lamination by vertically alternately stacking pluralities of resin plates (3a) and metal plates (3b) such that a metal plate (3b) and at least one of the resin plates (3a) adjoining the upper and lower sides of the metal plate (3b) will be relatively and horizontally slid upon occurrence of an earthquake.

Description

Satsuki Itoda

Technical field

The present invention relates to a seismic isolation device that is provided between an upper structure such as a building and a foundation and suppresses the swing of the upper structure due to an earthquake. Background art

Conventionally, various types of seismic isolation devices of this type have been proposed.

As disclosed in Japanese Patent Application Publication No. 60-2500143, a load supporting function and a sliding function are provided between an upper plate connected to an upper structure and a lower plate connected to a foundation. (Supporting the upper plate so as to be slidable relative to the lower plate in the horizontal direction) A support (pairing plate) is provided, and the support is sealed by a cylindrical rubber spring. In such a sliding type seismic isolation device that has been proposed, when an earthquake occurs, the upper plate slides horizontally with respect to the lower plate by the support, so that sudden vibrations can be lengthened and reduced, and After the convergence of the earthquake, the upper plate and the upper structure can be returned to the position before sliding by the restoring force of the rubber spring.The kinetic frictional force of the sliding part acts as a damping force to converge vibration early. . However, in order to obtain a sufficient seismic isolation effect by increasing the relative sliding amount of the upper plate to the lower plate in the event of an earthquake, the above-mentioned conventional device requires that the upper plate slide relative to the lower plate. It is necessary to provide a sufficient gap between the support and the rubber spring so that the support does not abut on the rubber spring and deform the rubber spring, and the seismic isolation device increases in the horizontal direction by that much. There's a problem. On the other hand, by making the outer diameter of the support smaller, it is possible to make the gap sufficiently without increasing the size of the seismic isolation device.However, in this case, the upper plate on which the load of the upper structure is loaded is supported. One of the sliding surfaces that slides on each other when the upper structure is tilted and an oblique force acts on the seismic isolation device in the horizontal direction due to the inclination of the upper structure during an earthquake, etc. Can easily come into contact with the other As a result, the slidability deteriorates and a sufficient seismic isolation effect cannot be obtained.

The present invention has been made in view of such a point, and an object of the present invention is to reduce the size of the seismic isolation device in the horizontal direction by improving the configuration of the above-described seismic isolation device for a sliding eve. The goal is to ensure good seismic isolation effects. Disclosure of the invention

In order to achieve the above object, according to the present invention, the support is configured such that a plurality of resin plates and a metal plate are alternately stacked in the vertical direction, and the metal plate and the upper and lower sides of the metal plate The resin plate adjacent to at least one of them was configured to slide relatively horizontally in the event of an earthquake.

Specifically, an upper plate connected to the upper structure, a lower plate provided facing the lower side of the upper plate and connected to the foundation, and an outer peripheral portion between the upper plate and the lower plate other than the outer peripheral portion And a support for supporting the upper plate slidably in a horizontal direction relative to the lower plate, and elastically connecting at least a part of the outer peripheral portions of the upper plate and the lower plate. And an elastic body that is deformed when the upper plate slides relative to the lower plate in a horizontal direction, so as to suppress the shaking of the upper structure against an earthquake. In the support, a plurality of resin plates and metal plates are alternately stacked in the vertical direction, and the metal plate and the resin plate adjacent to at least one of the upper side and the lower side of the metal plate generate an earthquake. It shall be configured to be able to slide relatively horizontally in some cases.

With the above configuration, the resin plate and the metal plate of the support slide relatively horizontally in the event of an earthquake, and at this time, the resin plate and the metal plate are located on the upper side similarly to the deformation of the elastic body The upper plate slides substantially horizontally with respect to the lower plate, and is approximately the same as the relative sliding amount between the resin plate or metal plate located at the top of the support and the resin plate or metal plate located at the bottom. Slides in the horizontal direction relatively to the lower plate, and this makes the sudden vibration longer and softer. After the convergence of the earthquake, the upper plate and the upper structure can be returned to the position before sliding by the restoring force of the elastic body. And, as described above, the more the resin plate and the metal plate are located on the upper side in the same manner as the deformation of the elastic body, the more they slide with respect to the lower plate, so that the gap between the support and the elastic body is loose. Even if it is not removed, the elastic body will not be locally deformed significantly by the resin plate and the metal plate. Therefore, even if the outer diameter of the resin plate and the metal plate is increased to some extent, the seismic isolation device does not become so large in the horizontal direction. In addition to improving the support of the superstructure in the event of an earthquake, even if an oblique force acts on the seismic isolation device due to the inclination of the superstructure during the earthquake, the relative One of the facing sliding surfaces does not tilt with respect to the other, and slides smoothly with each other. Therefore, it is possible to obtain a good seismic isolation effect while reducing the size of the seismic isolation device in the horizontal direction.

The support of the seismic isolation device is configured such that the metal plate of the support and the resin plate adjacent to one of the upper side and the lower side of the metal plate can slide relatively horizontally in the event of an earthquake. Preferably, an elastic sheet member is provided between the metal plate of the support and a resin plate adjacent to the other of the metal plates.

In this way, immediately after the occurrence of the earthquake, before the opposing sliding surfaces shift from the stationary state to the dynamic friction state, the elastic sheet member shears in the horizontal direction. Even without sliding, the upper plate slightly moves in the horizontal direction relative to the lower plate due to this shear deformation, and even if the opposing sliding surfaces shift to the state of kinetic friction, the upper plate Large acceleration change can be suppressed. In other words, when there is no elastic sheet member, the upper plate starts to move rapidly with respect to the lower plate when transitioning from the static state due to the static friction force to the dynamic friction state. Occurs. Since the change in acceleration of the upper plate is considerably smaller than the change in acceleration of the seismic motion, the seismic isolation device can provide a sufficient seismic isolation effect on the first floor of the upper structure. As a result, the horizontal vibration acceleration increases, and the vibration reduction effect of the seismic isolation device tends to decrease. This tendency is particularly noticeable in light-weight two- or three-story buildings such as wooden houses. However, in this configuration, since the change in the acceleration of the upper plate is suppressed by the elastic sheet member, a decrease in the seismic isolation effect on the upper floor can be suppressed. Therefore, a good seismic isolation effect can be obtained on any floor. When the elastic sheet member is provided in this manner, the elastic sheet member of the support is fixed to the upper and lower resin plates and the metal plate, and the outer diameter of the metal plate is set smaller than that of the resin plate. Is desirable. Thus, it is possible to prevent the metal plate having a large inertia from sliding largely in the horizontal direction and locally deforming the elastic body significantly. Further, by making the outer diameter of the metal plate smaller than that of the resin plate, it is possible to reliably prevent the metal plate from contacting the elastic body. Therefore, the elastic body can be prevented from being damaged by the metal plate.

In this case, it is desirable that the corners of the outer peripheral surface of the resin plate and the upper and lower surfaces of the support be chamfered. By doing so, even if the resin plate abuts against the elastic body, the elastic body will not be damaged at the corners, and the function of the elastic body will not be disturbed during the operation of the seismic isolation device can do.

In the above seismic isolation device, it is preferable that the coefficient of kinetic friction between the resin plate and the metal plate that can slide horizontally with each other in the event of an earthquake in the support is set to 0.03 to 0.2. No. That is, if the coefficient of kinetic friction between the resin plate and the metal plate is smaller than 0.03, the vibration damping action is small, making it difficult to suppress the vibration.On the other hand, if it is larger than 0.2, the seismic intensity is not quite large. Since the seismic isolation effect is not sufficiently exhibited, the range is set to 0.3 to 0.2. Therefore, a good seismic isolation effect can be obtained regardless of the magnitude of the seismic intensity.

In the above seismic isolation device, the elastic body is preferably made of a cylindrical rubber member that connects the entire outer periphery of the upper plate and the lower plate and covers the support over the entire periphery. . In this way, regardless of the direction in which the upper plate slides with respect to the lower plate, a stable restoring force is generated in the cylindrical rubber member with no directivity, and the rubber member and the support oppose each other. Since dust and dirt can be prevented from entering between the sliding surfaces, stable slidability can be maintained for a long period of time.

When the elastic body is formed of a cylindrical rubber member in this manner, resin plates are respectively disposed on the uppermost and lowermost portions of the support, and the outer diameters of the two resin plates are smaller than those of the other resin plates. It is desirable that it is set. In other words, the connection between the rubber member and the upper and lower plates is a portion where a large stress is generated and stress concentration is likely to occur, so that the resin plates disposed at the uppermost and lowermost portions of the support are used. It is easily damaged by contact. However, in this configuration, Since the outer diameters of the resin plates provided at the uppermost and lowermost parts of the body are smaller than those of the other resin plates, make sure that both resin plates do not come into contact with the connection between the upper and lower plates of the rubber member. Thus, damage to the rubber member can be suppressed. Even if the two resin plates abut against the rubber member, the degree of damage to the rubber member is smaller than when the metal plate abuts, and the rubber member can be effectively protected.

Further, it is desirable that both resin plates provided at the uppermost and lowermost portions of the support are fixed to the lower surface of the upper plate and the upper surface of the lower plate, respectively. By doing so, it is possible to reliably prevent damage at the connection between the resin plate and the upper and lower plates of the rubber member, and at the same time, increase the thickness of the connection at a portion thicker than at other portions, thereby improving strength. Can be improved, and damage due to repeated deformation of the connection portion can also be prevented. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a seismic isolation device according to Embodiment 1 of the present invention.

FIG. 2 is an exploded view showing an assembling procedure of the seismic isolation device of FIG.

FIG. 3 is a diagram corresponding to FIG. 1 showing a state of the seismic isolation device of FIG. 1 during operation.

FIG. 4 is a diagram corresponding to FIG. 1 showing a modification of the first embodiment.

Figure 5 is a schematic diagram showing the procedure for testing the seismic isolation effect of a seismic isolation device applied to a private house.

FIG. 6 is a cross-sectional view illustrating the seismic isolation device according to the second embodiment.

FIG. 7 is a diagram corresponding to FIG. 6, illustrating a state in which the resin plate and the metal plate of the support in the seismic isolation device of FIG. 6 relatively slide horizontally when an earthquake occurs.

FIG. 8 is a diagram corresponding to FIG. 6, showing a state in which the elastic sheet member of the support in the seismic isolation device of FIG. 6 is sheared and deformed immediately after the earthquake.

Figure 9 is a graph showing the horizontal shear characteristics of the seismic isolation layer between the foundation and the foundation equipped with the seismic isolation device in the vibration analysis.

FIG. 10 is a graph showing a change in vibration acceleration at each floor as a vibration analysis result. FIG. 11 is a diagram corresponding to FIG. 6 showing a modified example using a laminate as an elastic body. BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1

FIG. 1 shows a seismic isolation device A according to Embodiment 1 of the present invention. The seismic isolation device A is provided between an upper structure such as a building and a foundation, and shakes the upper structure against an earthquake. It is intended to suppress The seismic isolation device A includes a circular stainless steel upper plate 1 connected to the upper structure, and a lower stainless steel plate, which is provided opposite to the upper plate 1 and is connected to the foundation. And a steel lower plate 2.

A support 3 that supports the upper plate 1 so as to be slidable in the horizontal direction relatively to the lower plate 2 is provided at a portion other than the outer peripheral portion between the upper plate 1 and the lower plate 2. The support 3 is composed of five circular resin plates 3a and four circular metal plates 3b alternately stacked in the up-down direction. a is arranged everywhere. The metal plate 3b of the support 3 is formed so that the outer diameter is smaller than the resin plate 3a, and the resin plate 3a adjacent to one of the upper side and the lower side of the metal plate 3b is formed. (The metal plate 3b above the resin plate 3a located at the center in the vertical direction is connected to the resin plate 3a above it and the resin plate 3a located at the center in the vertical direction. The lower metal plate 3b is fixed to the lower resin plate 3a, respectively). The metal plate 3b and the resin plate 3a adjacent to the other of the metal plates 3b are merely in contact with each other, and can relatively slide horizontally in the event of an earthquake. It has become. The uppermost and lowermost resin plates 3 a are also slidable relative to the upper plate 1 and the lower plate 2. In FIG. 1, for convenience of explanation, a gap is drawn between the slidable resin plate 3a and the metal plate 3b and between the resin plate 3a and the upper plate 1 or the lower plate 2 ( The same applies to FIG. 3, FIG. 4, FIG. 6 to FIG. 8, and FIG. 11).

The resin plate 3a of the support 3 is made of a lubricating resin such as ultra-high molecular weight polyethylene, high-density polyethylene, nylon, polytetrafluoroethylene, polyacetone, etc., and can withstand high compression. As described above, these resins may contain glass fiber, aramide fiber, carbon fiber, metal oxide whiskers as a reinforcing material, and further contain a lubricant. You may let it. On the other hand, the metal plate 3b is made of stainless steel. It is preferable that the coefficient of kinetic friction between the resin plate 3a and the metal plate 3b slidable with each other be set in a range from 0.03 to 0.2. This is because if the coefficient of kinetic friction between the resin plate 3a and the metal plate 3b is smaller than 0.03, the effect of damping the vibration is small and the vibration is hardly contained, while if it is larger than 0.2, This is because the seismic isolation effect cannot be fully exerted unless the seismic intensity is quite large. The dynamic friction coefficient may be adjusted within the above range by applying silicone oil or grease between the resin plate 3a and the metal plate 3b. However, if the resin plate 3a and the metal plate 3b are made of lubricating resin and stainless steel respectively as described above, the dynamic friction coefficient can normally be within the above range without applying grease or the like. it can. Further, a concave groove for radiating heat during sliding may be provided on each sliding surface of the resin plate 3a and the metal plate 3b.

The outer diameter of the metal plate 3b is set smaller than the resin plate 3a, and the outer peripheral portion of the resin plate 3a protrudes radially outward from the outer peripheral surface of the metal plate 3b. The outer diameters of both resin plates 3a provided at the uppermost and lowermost portions of the support 3 are set smaller than those of the other resin plates 3a. Further, each corner of the outer peripheral surface and the upper and lower surfaces of the resin plate 3a is rounded with an arc-shaped chamfer. The thickness of the resin plate 3a is larger than that of the metal plate 3b, so that the resin plate 3a can sufficiently withstand high compression.

The entire circumferences of the outer peripheral portions of the upper plate 1 and the lower plate 2 are elastically connected by a cylindrical rubber member 8 (elastic body) that covers the support 3 over the entire circumference. That is, the upper end of the rubber member 8 is vulcanized and bonded to the outer peripheral portion of the upper plate 2, while the lower end is vulcanized and bonded to a ring member 6 made of stainless steel. The outer peripheral portion of the second member is fixed to each other by a plurality of screws 7. As a result, the space between the upper plate 1 and the lower plate 2 is substantially closed. The rubber member 8 is made of a compounded rubber mainly composed of a natural rubber or a synthetic rubber or a composite material in which any one of the compounded rubbers is reinforced with a fiber, and has a breaking elongation of 600% or more. I have. The rubber member 8 generates a restoring force that extends when the upper plate 1 slides in any direction in the horizontal direction relative to the lower plate 2 and returns the upper plate 1 to the position before sliding. It is supposed to. Also, the upper and lower ends of the rubber member 8 are formed in an arc shape so that the thickness thereof becomes smoother than the center in the vertical direction. When the upper plate 1 slides in the horizontal direction with respect to the lower plate 2, stress concentration is reduced. The inner diameter of the rubber member 8 except for the upper and lower ends is set to be substantially the same as (slightly larger than) the outer diameter of the three resin plates 3 a other than the uppermost and lowermost portions of the support 3. The method of assembling the seismic isolation device A having the above configuration will be described with reference to FIG.

First, the upper plate 1 is vulcanized and adhered to the upper end surface of the rubber member 8, and the ring member 6 is vulcanized and adhered to the outer peripheral portion of the lower end portion, thereby forming the accommodating portion of the support 3.

Next, a support 3 is composed of four resin plates 3a and a metal plate 3b which are bonded and fixed in advance with an adhesive or the like, and one resin plate 3a located at the center in the upward and downward direction. The seismic isolation device A is completed by inserting the lower plate 2 into the ring member 6 with the screws 7 afterwards.

When the above seismic isolation device A is installed between the pillars etc. that constitute the upper structure and the foundation, the upper plate 1 is fixed to the upper structure and the lower plate 2 is fixed to the foundation with bolts (not shown) However, holes for bolts are formed in the outer periphery of the upper plate 1 and the lower plate 2). In this way, if the seismic isolation device A is provided between the superstructure and the foundation, the resin plate 3a and the metal plate 3b of the support 3 that can slide relative to each other during an earthquake will be relatively horizontal. Slide in the direction. At this time, as shown in FIG. 3, similarly to the deformation of the rubber member 8, the resin plate 3a and the metal plate 3b slide more largely in the horizontal direction with respect to the lower plate 2 as they are located on the upper side. The upper plate 1 slides relative to the lower plate 2 by substantially the same amount as the relative sliding amount between the resin plate 3a located at the uppermost position of 3 and the resin plate 3a located at the lowermost position. The period of the sudden vibration is reduced and softened. As a result, the horizontal swing of the upper structure can be suppressed, and the object installed inside the upper structure can be prevented from falling down. Also, since the rubber member 8 is deformed and stretched in the direction in which the upper plate 1 is displaced from the lower plate 2, a restoring force is generated in the rubber member 8 to return the upper plate 1 to the position before sliding, and the earthquake converges. Thereafter, the restoring force allows the upper plate 1 and the upper structure to return to the positions before sliding. This rubber member 8 generates the same restoring force when the upper plate 1 slides in any direction in the horizontal direction with respect to the lower plate 2, so that the same force is applied to seismic force from any direction. Can work.

The gap between the rubber member 8 and the resin plate 3 a other than the uppermost and lowermost portions of the support 3 is almost zero. Although no gap is provided, as described above, as the resin plate 3a and the metal plate 3b are located on the upper side along the rubber member 8, the resin plate 3a and the metal plate 3b slide more largely in the horizontal direction with respect to the lower plate 2, so that the rubber member 8 is uniformly deformed over the entire vertical direction, and is not locally deformed significantly. Therefore, even if the outer diameters of the resin plate 3a and the metal plate 3b are increased to some extent, there is no need to provide a gap with the rubber member 8, so that the seismic isolation device A does not increase in the horizontal direction, and By making the outer diameters of the plate 3a and the metal plate 3b appropriate, not only during normal times but also during an earthquake, the support of the upper structure is improved, and the upper structure tilts when an earthquake occurs. Even if a diagonal force acts on the seismic isolation device A in the horizontal direction, one of the opposing sliding surfaces does not tilt with respect to the other, and slides smoothly with each other. Also, by making the outer diameters of the resin plate 3a and the metal plate 3b appropriate as described above, even if the number of layers of the resin plate 3a and the metal plate 3b is not so large, The relative sliding amount of the upper plate 1 with respect to the lower plate 2 can be increased while maintaining the support of the structure, and as a result, the height of the seismic isolation device A can be kept relatively low. Therefore, it is possible to obtain a good seismic isolation effect while reducing the size of the seismic isolation device A.

Further, since the metal plate 3b is fixedly joined to the resin plate 3a adjacent to either the upper side or the lower side of the metal plate 3b, the metal plate 3b having a large inertia slides largely in the horizontal direction. The rubber member 8 is not locally deformed by the movement. Since the corners of the outer peripheral surface and the upper and lower surfaces of the resin plate 3a are chamfered, the rubber member 8 is not damaged even if the resin plate 3a comes into contact with the rubber member 8. .

Further, since the outer diameters of the two resin plates 3a provided at the uppermost and lowermost portions of the support 3 are set smaller than the other resin plates 3a, the two resin plates 3a are It can be prevented from contacting the connecting portion between the upper plate 1 and the ring member 6 in the above. That is, a portion of the rubber member 8 where stress concentration is likely to occur can be effectively protected, and damage to the rubber member 8 can be prevented.

In the first embodiment, the metal plate 3b of the support 3 is fixed to the resin plate 3a adjacent to one of the upper and lower sides of the metal plate 3b. It may be configured to be able to slide horizontally relative to the resin plate 3a adjacent to both. in this case, It is desirable to chamfer the corners of the outer peripheral surface and the upper and lower surfaces of the metal plate 3b. In the first embodiment, the upper and lower resin plates 3a provided at the uppermost and lowermost portions of the support 3 are configured to be slidable relative to the upper plate 1 and the lower plate 2, respectively. However, as shown in FIG. 4, the two resin plates 3a may be fixedly joined to the lower surface of the upper plate 1 and the upper surface of the lower plate 2 respectively. In this way, it is ensured that both the uppermost and lowermost resin plates 3a of the support 3 abut on the connection portions of the rubber member 8 with the upper plate 1 and the ring member 6, and the rubber member 8 is damaged. Can be prevented. In this case, the uppermost and lowermost resin plates 3a of the support 3 are used alone without being fixed to the metal plate 3b, and the resin plate 3a at the center in the vertical direction has metal What is necessary is just to use it in the state which fixed board 3b. Also, if the connection between the upper plate 1 and the rubber member 8 is made via the ring member 6 as in the case of the lower plate 2, the seismic isolation device A is made symmetrical with respect to its vertical center line. be able to.

Here, a seismic isolation device A similar to that of the first embodiment was actually manufactured and its seismic isolation effect was examined. That is, the resin plate 3 a is made of nylon resin, and the metal plate 3 b is made of stainless steel to produce a support 3 having the same configuration as that of the first embodiment. Was prepared. As shown in Fig. 5, each seismic isolation device A was provided between each pillar 22 located at the four corners of the upper structure 21 of the private house and the foundation 23. The foundation 23 is installed on a plurality of openings for testing, and it is possible to shake the foundation 23 by applying vibration in a horizontal direction. The horizontal friction coefficient of each of the seismic isolation devices A was 0.1, and the horizontal spring constant was 4.4 X 1 (VN / m. The mass of the upper structure 21 was 40 t, almost the same as ordinary wooden houses.

Then, a seismic wave was input in the horizontal direction to the foundation 23, and the vibration damping effect of the upper structure 21 was examined. As a result, the maximum horizontal acceleration of the superstructure 21 was reduced to about 1/5 of the input wave, the maximum horizontal displacement was about 15 cm or less, and it was confirmed that the seismic isolation effect was sufficiently exhibited. Was done.

Embodiment 2

FIG. 6 shows a second embodiment of the present invention (note that the same parts as those in FIG. However, a detailed description thereof is omitted), but a circular elastic sheet member 3c is interposed between the resin plate 3a and the metal plate 3b that are joined and fixed to each other in the first embodiment.

That is, in the second embodiment, the support 3 is configured such that the metal plate 3 b of the support 3 and the resin plate 3 a adjacent to one of the upper side and the lower side of the metal plate 3 b are relative to each other when an earthquake occurs. The metal plate 3b of the support 3 and a resin plate 3a adjacent to the other of the metal plate 3b are substantially the same as the metal plate 3b. An elastic sheet member 3c having a diameter is interposed. The elastic sheet member 3c is made of synthetic rubber, natural rubber, low elasticity thermoplastic resin, or the like, and has a thickness of 1 to 10 mm. Then, the elastic sheet member 3c is fixed to the resin plate 3a and the metal plate 3b on both the upper and lower sides thereof with an adhesive (epoxy resin, etc.), and together with the resin plate 3a and the metal plate 3b. It is integrated. In the second embodiment, the two resin plates 3a provided at the uppermost and lowermost portions of the support 3 are respectively fixed to the lower surface of the upper plate 1 and the upper surface of the lower plate 2 (see above). It may be slidable as in the first embodiment).

If the seismic isolation device A is provided between the upper structure and the foundation, the resin plate 3a and the metal plate 3b are made of rubber when an earthquake occurs, as shown in FIG. As it is positioned higher along the member 8, it slides more horizontally with respect to the lower plate 2, thereby suppressing the horizontal vibration of the upper structure. When the sliding surfaces of the resin plate 3a and the metal plate 3b are in a stationary state immediately after the occurrence of the earthquake, as shown in FIG. 8, the elastic sheet member 3c undergoes shear deformation in the horizontal direction. Even if 3a and the metal plate 3b do not slide, the upper plate 1 moves slightly in the horizontal direction relatively to the lower plate 2 due to the shear deformation of the elastic sheet member 3c. Even when the sliding surfaces shift to a state of dynamic friction, it is possible to suppress the occurrence of a large acceleration change in the upper plate 1. That is, when the elastic sheet member 3c is not provided, the upper plate 1 rapidly moves relative to the lower plate 2 when the static state is changed from the stationary state due to the static frictional force to the dynamic friction state, so that a large acceleration change occurs in the upper plate 1. . Since the change in acceleration of the upper plate 1 is much smaller than the change in acceleration of the seismic motion, the seismic isolation effect of the seismic isolation device A can be sufficiently obtained on the first floor of the upper structure. The horizontal vibration acceleration increases due to the change in the acceleration of 1 and the vibration reduction effect of the seismic isolation device A decreases. Tend to. This tendency is particularly noticeable in light-weight two- or three-story buildings such as wooden houses. However, in the second embodiment, since the change in the acceleration of the upper plate 1 is suppressed by the elastic sheet member 3c, a good seismic isolation effect can be obtained even on the upper floor.

Here, vibration analysis was performed assuming that the seismic isolation device A of Embodiment 2 was installed between a two-story superstructure having a total weight of 1.96 MN and the foundation, and the vibration acceleration of each floor was measured. Was examined. In order to examine the effect of the elastic sheet member 3c, the same thing as in the first embodiment (the same as the second embodiment except that the support 3 does not have the elastic sheet member 3c) is described. We also performed vibration analysis.

At this time, the natural period of the horizontal shear characteristic of the seismic isolation layer between the superstructure equipped with the seismic isolation device A and the foundation was 2.7 seconds, and the equivalent rigidity was 0.98 MN / m. Then, assuming that the hysteresis loop is represented by a parallelogram as shown in FIG. 9, the horizontal displacement (the primary rigidity) of the two sides facing each other in the axial direction depends on the presence or absence of the elastic sheet member 3c. The inclination of the two sides facing each other in the horizontal load axis direction (secondary rigidity) was set to 0.57 MN / m. Specifically, the primary stiffness is set so that the ratio of the secondary stiffness to the primary stiffness is 0.3 when the elastic sheet member 3c is provided, and is set when the elastic sheet member 3c is not provided (see FIG. (Indicated by a broken line in Fig. 9). That is, the primary stiffness was set to 1.89 MN / m when there was the elastic sheet member 3c, and 4.86 when there was no elastic sheet member 3c. Then, the earthquake waveform (vibration acceleration of 500 cm / s ² ) was input and the horizontal vibration acceleration at each floor was calculated.

As a result of the above vibration analysis, the vibration acceleration of each floor was as shown in Fig. 10. That is, when the elastic sheet member 3c is not provided, the vibration reduction effect on the first floor is good, but the acceleration in the second floor ceiling is considerably larger than the first floor by 1.58 times. On the other hand, when the elastic sheet member 3c is provided, the vibration reduction effect on the first floor is slightly inferior to the case without the elastic sheet member 3c, but the acceleration ratio of the second floor ceiling portion to the first floor portion is smaller. From 1 to 19, it can be seen that the provision of the elastic sheet member 3c can suppress the deterioration of the seismic isolation effect on the upper floor. In the second embodiment, the flexible sheet member 3c of the support 3 is fixed to the resin plate 3a and the metal plate 3b on both the upper and lower sides by an adhesive to integrate the three members. The member 3c may be simply brought into contact with the resin plate 3a and the metal plate 3b. In this case, each coefficient of static friction between the resin plate 3a and the elastic sheet member 3c and between the metal plate 3b and the elastic sheet member 3c is the same as that of the resin plate 3a and the metal plate 3b. The coefficient of static friction is sufficiently larger than the static friction coefficient between them, and the above three members are substantially integrated only by the static friction force without using an adhesive.

In the first and second embodiments, the resin plates 3 a are provided at the uppermost and lowermost portions of the support 3. However, the uppermost and lowermost portions of the support 3 do not necessarily have to be the resin plates 3 a. Instead, metal plates 3b may be provided at the top and bottom, respectively. Further, the outer diameters of the resin plate 3a and the metal plate 3b may all be substantially the same. In this case, it is desirable to chamfer the corners of the outer peripheral surface and the upper and lower surfaces of the metal plate 3b.

Further, in the first and second embodiments, the resin plate 3a is made of a lubricating resin and the metal plate 3b is made of stainless steel. However, the kinetic friction between the resin plate 3a and the metal plate 3b which can slide with each other is described. Other resins and metals may be used as long as the coefficient can be set to 0.3 to 0.2.

In the first and second embodiments, the upper plate 1, the lower plate 2, and the resin plate 3a and the metal plate 3b of the support 3 are formed in a circular shape, but they may be formed in a polygonal shape. However, in this case, it is desirable to chamfer the corners of the polygon on the outer peripheral surfaces of the resin plate 3a and the metal plate 3b.

In addition, in the first and second embodiments, the cylindrical rubber member 8 including the support body 3 composed of the resin plate 3a and the metal plate 3b is used as the elastic body. It is also possible to arrange them at substantially equal intervals in the circumferential direction. Also, as shown in FIG. 11 (in FIG. 11, the support 3 is the same as that of the second embodiment, the elastic body may be the same as that of the first embodiment). A cylindrical laminated body 15 in which 5a and rigid plate layers 15b made of a steel plate or the like are alternately laminated in an upward and downward direction may be used. In this way, when the upper plate 1 slides relative to the lower plate 2 in the horizontal direction, the elastic rubber layer 15a is sheared and deformed to generate a shear force, and this shear force is a restoring force. Becomes In this case, the laminate 15 The relationship between the shear force generated in the elastic rubber layer 15a and the relative sliding amount of the upper plate 1 and the lower plate 2 is determined by the tensile force generated in the rubber member 8 and the relative sliding amount of the upper plate 1 and the lower plate 2 in the above embodiment. Compared to the relationship with the momentum, it is closer to linear and easier to handle. Further, the elastic rubber layer 15 and the rigid plate layer 15 are laminated in the same manner as the above-mentioned laminated body 15, and the diameter of the laminated body 15 is substantially smaller than the thickness (difference in inner and outer diameters). A plurality of columnar members may be prepared, and these columnar laminates may be arranged on the outer peripheral portions of the upper plate 1 and the lower plate 2 at substantially equal intervals in the circumferential direction. Industrial applicability

INDUSTRIAL APPLICABILITY The seismic isolation device of the present invention is provided between an upper structure such as a building and a foundation, and is useful as a device for suppressing the shaking of the upper structure due to an earthquake. The industrial applicability is high in that it exhibits

Claims

Scope of word blue

1. An upper plate connected to the upper structure, a lower plate provided facing the lower side of the upper plate and connected to the foundation, and a portion other than the outer peripheral portion between the upper plate and the lower plate. A support that slidably supports the upper plate relative to the lower plate in a horizontal direction relative to the lower plate, and at least a part of the outer peripheral portions of the upper plate and the lower plate are sexually connected to each other; An elastic body that is deformed when the upper plate slides relative to the lower plate in a horizontal direction, wherein the seismic isolation device suppresses the shaking of the upper structure due to an earthquake,

The support is formed by alternately stacking a plurality of resin plates and metal plates in the vertical direction, and the metal plate and the resin plate adjacent to at least one of the upper side and the lower side of the metal plate when the earthquake occurs. A seismic isolation device configured to be relatively horizontally slidable.

2. The support is configured such that a metal plate of the support and a resin plate adjacent to one of the upper side and the lower side of the metal plate can relatively slide horizontally in the event of an earthquake,

The seismic isolation device according to claim 1, wherein an elastic sheet member is interposed between the metal plate of the support and a resin plate adjacent to the other of the metal plates.

3. The seismic isolation according to claim 2, wherein the elastic sheet member of the support is fixed to a resin plate and a metal plate on both upper and lower sides thereof, and an outer diameter of the metal plate is set smaller than that of the resin plate.

4. The seismic isolation device according to claim 3, wherein each corner of the outer peripheral surface and the upper and lower surfaces of the resin plate in the support is chamfered.

5. The seismic isolation device according to claim 1 or 2, wherein a coefficient of kinetic friction between the resin plate and the metal plate, which can slide in a horizontal direction when an earthquake occurs in the support, is set to 0.03 to 0.2. c

6. The seismic isolation device according to claim 1 or 2, wherein the elastic body is a cylindrical rubber member that connects the entire outer periphery of the upper plate and the lower plate and covers the support over the entire periphery.

7. At the top and bottom of the support, resin plates are respectively arranged,

7. The seismic isolation device according to claim 6, wherein the outer diameters of the two resin plates are set smaller than the other resin plates.

8. The seismic isolation device according to claim 7, wherein the two resin plates disposed at the uppermost portion and the lowermost portion of the support are respectively fixed to the lower surface of the upper plate and the upper surface of the lower plate.