JP4974110B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device for a building, and more particularly to a seismic isolation device suitable for a wooden house.

As is clear from examples of the Great Hanshin-Awaji Earthquake and the Niigata Earthquake, in recent years there have been a tendency for many large earthquakes whose seismic intensity exceeds 5. In order to cope with such a large earthquake, various seismic isolation devices are incorporated in new buildings such as high-rise buildings, and these seismic isolation devices are considered to exhibit excellent seismic resistance against large earthquakes. It has been.
However, the rate of incorporation of seismic isolation devices into ordinary wooden houses, that is, the penetration rate is low. This is because if the seismic isolation device for a high-rise building is applied to a wooden house, a substantial change is required in the basic structure of the wooden house.

Under such circumstances, a seismic isolation device suitable for a wooden house has been developed, and this type of seismic isolation device includes an elastic cylinder interposed between a wooden house foundation and its wooden base (for example, Patent Document 1). Such an elastic cylinder is considered to effectively exert its seismic isolation function with respect to the horizontal force (earthquake transverse wave) transmitted from the foundation to the foundation when an earthquake occurs (see FIG. 4 of Patent Document 1). .
Japanese Patent Laid-Open No. 11-62309

However, in the case of the seismic isolation device of Patent Document 1, since a rod-like body is arranged in the center of the elastic cylinder, such a rod-like body restrains the upper and lower elastic compression of the elastic cylinder, and an earthquake occurs. The seismic isolation function of the vertical force transmitted from the foundation to the foundation (the longitudinal wave of the earthquake) cannot be effectively demonstrated.
The present invention has been made on the basis of the above circumstances, and the purpose thereof is to effectively exhibit the seismic isolation function with a simple configuration with respect to both the horizontal force and the vertical force caused by the earthquake, The object is to provide a seismic isolation device that is superior in terms of durability.

  In order to achieve the above object, the present invention is applied to a seismic isolation device provided between a fixed base and a building support. The seismic isolation device of the present invention is erected from a fixed base and faces upward. An anchor member having a shaft portion extending in the direction, a fixing member supported by the anchor member, having a concave receiving surface on the upper surface, and a shaft portion of the anchor member protruding upward from the receiving surface, and a support base And having a convex movable surface received by the receiving surface of the fixed member in a state where the anchor shaft is loosely inserted on the lower surface thereof, and the movable surface is guided to the receiving surface, thereby fixing the fixed portion. A movable member that is allowed to move in a horizontal direction and a vertical direction relative to the shaft, and is provided between the shaft portion of the anchor member and the movable member. Maintain and move contact And a damping spring mechanism that attenuates relative displacement of the timber (claim 1).

  According to the above-described seismic isolation device, when the movable member is displaced relative to the stationary member in at least one of the horizontal direction and the vertical direction with respect to the fixed member, the relative displacement here is the spring force of the damping spring mechanism. Brought against. The biasing force here maintains the contact between the receiving surface of the fixed member and the movable surface of the movable member, and the vibration energy of the earthquake that is transmitted to the building support via the movable member is the receiving surface. Is absorbed by the damping spring mechanism while being consumed by the frictional resistance between the movable surface and the movable surface. As a result, the actual vibration input to the building is reduced.

Specifically, the receiving surface of the fixed member and the movable surface of the movable member are formed from a part of a spherical surface (Claim 2), a tapered surface (Claim 3), or an annular cross-sectional arc surface (Claim 4). can do.
Preferably, the damping spring mechanism can include a plurality of disc springs arranged so as to overlap each other around the shaft portion of the anchor member. In this case, the disc springs adjacent to each other in the vertical direction can be arranged in the same direction or in opposite directions.

Further, it is preferable that the damping spring mechanism is attached to the shaft portion of the anchor member so as to be adjustable in the vertical direction and includes a spring seat for the disc spring located at the uppermost position.
The plurality of disc springs constituting the damping spring mechanism not only absorb the vibration energy in the vertical direction, but also absorb the vibration energy in the horizontal direction due to the relative displacement in the radial direction of the anchor shaft. Further, the vertical position of the spring seat sets the set load of the damping spring mechanism, that is, the disc spring.

  Specifically, the fixed base is a concrete base, and the support base is a wooden base of a wooden house as a building (Claim 7).

  In the seismic isolation device according to claims 1 to 7, the convex receiving surface of the movable member is received by the concave receiving surface of the fixed member, while the movable member is simply pressed against the fixed member via the damping spring mechanism. With the configuration, it effectively consumes and absorbs vibration energy of earthquakes, and exhibits an excellent seismic isolation function for buildings.

FIG. 1 shows a seismic isolation device 1 according to a first embodiment applied to a wooden house. A plurality of seismic isolation devices 1 are interposed between a concrete base 2 and a wooden base 4 in a wooden house. Yes. The seismic isolation device 1 includes an anchor shaft 6 as an anchor member. The anchor shaft 6 is vertically erected upward from the foundation 2 and has a screw portion 8 at an upper end portion thereof.
A disk-shaped fixed cradle 10 is disposed on the base 2 as a fixing member. In the present embodiment, a level adjuster 12 is sandwiched between the fixed cradle 10 and the base 2. The level adjuster 12 slightly adjusts the upper and lower levels of the fixed pedestal 10. Specifically, the level adjuster 12 includes a variable spacer developed by the same inventor as that of the present application (Japanese Patent Laid-Open No. 2006). -291712) can be used.

  The fixed cradle 10 is an integrally molded product made of a synthetic resin such as polypropylene, and has an insertion hole 14 at the center thereof. The insertion hole 14 is used for inserting the anchor shaft 6 and has an oval shape as apparent from FIG. The upper surface of the fixed pedestal 10 is formed as a concave and circular receiving surface 16. In this embodiment, the receiving surface 16 is formed from a part of a spherical surface and has a bottom shape of a shallow round plate. Further, a circular bottomed hole 18 that is continuous with the insertion hole 14 is formed in the center of the receiving surface 16, and a metal fastening nut 20 and a washer 21 are disposed in the bottomed hole 18. The fastening nut 20 is screwed to the anchor shaft 6, and the fixed cradle 10 is fastened to the base 2 via a washer 21, whereby the fixed cradle 10 is fixed on the base 2.

Further, the fixed cradle 10 has a plurality of legs 22 at the lower part thereof, and these legs 22 are arranged at equal intervals in the circumferential direction of the fixed cradle 10. The leg 22 is not necessarily required, but the leg 22 is elastically deformed when an earthquake occurs, allowing the fixed base 10 to be displaced in the vertical and horizontal directions, and useful for reducing the impact applied to the fixed base 10. It is.
A movable cradle 24 is mounted on the fixed cradle 10 as a movable member, and the movable cradle 24 is coupled to the base 4 at an upper portion thereof. Specifically, the movable cradle 24 is also an integrally molded product made of a synthetic resin such as polypropylene, like the fixed cradle 10, and has a pair of side walls 26. These side walls 26 are separated in the width direction of the base 4 as seen in FIG. 1, and the height of the side walls 26 and the distance between the side walls 26 are substantially equal to the height dimension and the width dimension of the base 4 respectively.

A rectangular intermediate partition wall 28 is provided between the pair of side walls 26, and the intermediate partition wall 28 is positioned below the center as viewed in the height direction of the side wall 26 and connects the pair of side walls 26 to each other. The intermediate partition wall 28 cooperates with the pair of side walls 26 and forms a receiving frame for the base 4 as is apparent from FIG.
A plurality of insertion holes 30 are formed in each side wall 26, and set screws 32 are respectively screwed into the base 4 through the insertion holes 30, whereby the movable receiving base 24 is fixed to the base 4. .

In FIG. 1, only one set screw 32 is shown on each side wall 26. As shown in FIG. 3, the insertion holes 30 are preferably distributed asymmetrically when viewed between the pair of side walls 26, and the insertion holes 30 on one side wall 26 and the insertion holes 30 on the other side wall 26 Are not positioned on the same line.
Further, a bottom wall 34 is provided between the pair of side walls 26 below the intermediate partition wall 28. The bottom wall 34 has a rectangular shape similar to that of the intermediate partition wall 28, and connects the lower ends of the pair of side walls 26 to each other as shown in FIG. Therefore, as apparent from FIG. 1, the movable pedestal 24 has a spring accommodating chamber 36 at the lower part thereof which is partitioned by the side wall 26 on the lower side and is partitioned by the intermediate partition wall 28 and the bottom wall 34 on the upper and lower sides. Note that both ends of the spring accommodating chamber 36 spaced apart in the longitudinal direction of the base 4 are opened.

  A convex and circular movable surface 38 is formed on the lower surface of the bottom wall 34, and the movable surface 38 projects downward. The movable surface 38 is formed from a part of a spherical surface similar to the receiving surface 16 of the fixed cradle 10 described above, and can be in close contact with the receiving surface 16. As is clear from FIG. 4, the movable surface 38 has a maximum outer diameter substantially equal to the distance between the pair of side walls 26, but this maximum outer diameter is larger than the maximum outer diameter of the receiving surface 16 in the fixed cradle 10. Only the dimension of is small.

In addition, a circular hole 40 is formed through the center of the movable surface 38, that is, in the lower portion thereof. The circular hole 40 is disposed concentrically with the movable surface 38, and the bottom hole 18 in the fixed cradle 10 is formed. The inner diameter is larger than the outer diameter. Therefore, as is apparent from FIG. 1, the anchor shaft 6 passes through the circular hole 40 with play and extends into the spring accommodating chamber 36.
Further, a plurality of ribs 42 are provided on the inner surface of the bottom wall 34. These ribs 42 are positioned in an annular region corresponding to the movable surface 38 and are arranged at equal intervals in the circumferential direction of the movable surface 38. Each rib 42 has an inner end face facing the circular hole 40 side, and a step 44 is formed on the inner end face by cutting away the upper corner. The step 44 of each rib 42 forms a support seat disposed on the same horizontal circle, and the support seat has a horizontal plane and a vertical plane. The ribs 42 described above can be replaced with an annular pedestal such that these ribs 42 are continuous in the circumferential direction of the convex surface 38.

A damping spring mechanism 45 is accommodated between the movable cradle 24 and the anchor shaft 6, that is, in the above-described spring accommodating chamber 36. The damping spring mechanism 45 will be described in detail below.
An annular washer 46 is placed on the step 44 of each rib 42, and this washer 46 has a thickness smaller than the step of the step 44 (the length of the vertical surface of the step 44), and its inner diameter is a circular hole. Although it is smaller than the inner diameter of 40, it is sufficiently larger than the outer diameter of the anchor shaft 6. Therefore, as shown in FIG. 1, the anchor shaft 6 passes through the washer 46 with play, and an annular gap is secured between the inner periphery of the washer 46 and the outer periphery of the anchor shaft 6. Such a gap relates to the anchor shaft 6 and the movable cradle 24, and allows the horizontal relative displacement of the anchor shaft 6 and the movable cradle 24 to restrict the maximum amount of such relative displacement.

  Further, a small-diameter disc spring 48 and a large-diameter disc spring 50 are disposed around the anchor shaft 6 as damping springs, and the small-diameter disc spring 48 and the large-diameter disc spring 50 are vertically stacked in the same direction. . The large-diameter disc spring 50 has an outer diameter whose outer peripheral edge abuts on the vertical surface of step 44 described above, and an inner diameter thereof is equal to the inner diameter of the washer 46. In contrast, the small-diameter disc spring 48 has an inner diameter larger than the inner diameter of the large-diameter disc spring 50, and the inner diameter is slightly larger than the outer diameter of the anchor shaft 6.

Therefore, as apparent from FIG. 1, the large-diameter disc spring 50 is disposed on the washer 46 with its outer peripheral edge in contact with the vertical surface of the step 44, and this washer 46 is used for the large-diameter disc spring 50. It is a spring seat. On the other hand, the small-diameter disc spring 48 is overlaid on the large-diameter disc spring 50 with its outer peripheral edge overlapping the inner peripheral portion of the large-diameter disc spring 50.
Further, an adjustment nut 52 is screwed to the upper end portion of the screw portion 8 of the anchor shaft 6, and the inner peripheral end of the small diameter disc spring 50 is in contact with the lower surface of the adjustment nut 52. Therefore, the adjusting nut 52 serves as a spring seat for the small-diameter disc spring 48, and when the adjusting bolt 52 is advanced and retracted in the axial direction of the anchor shaft 6, the damping composed of the small-diameter and large-diameter disc springs 48 and 50 is attenuated. The set load of the spring can be adjusted.

  As is clear from the above description, the movable pedestal 24 is only connected to the anchor shaft 6 via the above-described damping spring. The relative displacement between the fixed cradle 10 and the movable cradle 24 is allowed in the direction, that is, the vertical direction. Further, since the damping spring composed of the upper and lower disc springs 48 and 50 can be moved relative to the anchor shaft 6 in the radial direction, the fixed cradle 10 and the movable cradle 24 are also relatively displaced in the horizontal direction. Is allowed.

  An opening 54 is formed in the intermediate partition wall 28 of the movable pedestal 24 so as to be coaxial with the circular hole 40, and the opening 54 has an inner diameter substantially the same as the inner diameter of the washer 46. Therefore, since the interference between the upper end of the anchor shaft 6 and the intermediate partition wall 28 is avoided by the opening 54, the height dimension of the movable cradle 24 can be kept low. Assembling of the adjusting bolt 52 can be facilitated.

If the above-described seismic isolation device 1 is interposed between the foundation 2 and the base 4, when the earthquake occurs, the movable cradle 24 and the base 4 together with the base 4, as shown in FIG. , 50) with respect to the fixed cradle 10, that is, the anchor shaft 6 of the foundation 2, is allowed to be displaced relative to the horizontal and vertical directions while resisting the urging force.
Therefore, when the movable cradle 24 is relatively displaced in the horizontal direction, the contact between the movable surface 38 of the movable cradle 24 and the receiving surface 16 of the fixed cradle 10 is maintained by the damping spring, and among the vibration energy of the earthquake, The horizontal component is effectively consumed by the frictional resistance between the movable surface 38 and the receiving surface 16, and the small-diameter disc spring 48 and the large-diameter disc spring 50 are relatively relative to each other in the radial direction, as is apparent from FIG. , The upper and lower disc springs 48 and 50 are compressed in the vertical direction and are absorbed by the disc springs 48 and 50.

On the other hand, when the movable cradle 24 is lifted relative to the fixed cradle 10 due to the vibrational energy of the earthquake, both the small and large diaper springs 48 and 50 are compressed, so that the disc springs 48, 50 can also absorb the vertical component of vibration energy.
As a result, the seismic isolation device 1 of the first embodiment effectively consumes and absorbs vibration energy caused by the earthquake, and effectively exhibits the seismic isolation function for the wooden house.

When the earthquake ends, the movable pedestal 24 is guided to the receiving surface 16 of the fixed pedestal 10 by the restoring force of the damping springs (disc springs 48 and 50), and the original position shown in FIG. It will automatically return until.
The present invention is not limited to the first embodiment described above, and various modifications can be made. Other embodiments of the present invention will be described below. In the description of other embodiments, the same reference numerals are given to members and parts having the same functions as the members and parts of the first embodiment and the already described embodiments, and the description thereof is omitted. .

FIG. 6 shows the seismic isolation device 1 of the second embodiment.
In the case of the seismic isolation device 1 shown in FIG. 6, the upper surface of the fixed cradle 10 is formed as a female taper-shaped shallow receiving surface 56 instead of the receiving surface 16 that is a part of a spherical surface, and the lower surface of the movable cradle 24. Is formed as a male tapered movable surface 58 corresponding to the receiving surface 56. Even in such a combination of the receiving surface 56 and the movable member 58, the seismic isolation device 1 of the second embodiment can exhibit the same seismic isolation function as that of the first embodiment.

Further, as shown in FIG. 6, the receiving surface 56 can have an annular oil groove 60. Such an oil groove 60 supplies lubricating oil between the receiving surface 56 and the movable surface 58 and smoothes the sliding of the movable surface 58 with respect to the receiving surface 56.
Further, in any of the first and second embodiments, the damping spring mechanism 45 is composed of upper and lower disc springs 48 and 50, but conical coil springs can be used in place of these disc springs 48 and 50. Moreover, you may be comprised from the some coiled spring etc. which were arrange | positioned around the anchor shaft.

FIG. 7 shows the seismic isolation device 1 of the third embodiment.
In the case of the third embodiment, the damping spring mechanism 45 further includes a medium-diameter disc spring 49 between the upper and lower small-diameter disc springs 48 and the large-diameter disc spring 50, as is apparent from this third embodiment. The number of disc springs constituting the damping spring is not limited to two.
In the case of the third embodiment, the aforementioned rib 42 serves as a lower spring seat for the damping spring, and the washer 46 is not indispensable.

Furthermore, in the case of the third embodiment, the fixed cradle 10 is fastened to the anchor shaft 6 via upper and lower fastening nuts 62 a and 62 b and a washer 64. In this case, the washer 64 is disposed below the fixed cradle 10 and functions as a support for receiving the fixed cradle 10.
Therefore, even if the level position of the fixed cradle 10 is adjusted up and down by the action of the variable spacer 12, the fixed cradle 10 is fastened via the washer 64 between the upper and lower fastening nuts 62a and 62b. The shaft 6 is stably supported.

FIG. 8 shows the seismic isolation device 1 of the fourth embodiment.
In the case of the fourth embodiment, a screw hole 66 is formed in the center of the fixed cradle 10, and the anchor shaft 6 is screwed into the screw hole 66. That is, the fixed cradle 10 is directly supported by the anchor shaft 6, and the level position of the fixed cradle 10 can be adjusted up and down by rotating the fixed cradle 10 around the anchor shaft 6.

Further, the fixed cradle 10 can have a plurality of insertion holes 68 around the screw holes 66, and by inserting a tool into the insertion holes 68, the fixed cradle 10 can be easily rotated.
As shown in FIG. 8, the fixed cradle 10 of the fourth embodiment does not have the above-described leg 22, and both the upper surface and the bottom surface thereof are part of a spherical surface. The bottom surface is directly supported by the variable spacer 12. In this case, the variable spacer 12 is formed as a concave support surface whose upper surface matches the bottom of the fixed cradle 10.

FIG. 9 shows the movable cradle 24 of the seismic isolation device of the fifth embodiment.
In the case of the fifth embodiment, a notch 70 is formed in at least one of the side walls 26, and this notch 70 extends downward from the upper edge of the movable pedestal 24. If such a notch 70 is provided, when the seismic isolation device 1 according to the fifth embodiment is arranged at the intersection of the base 4, it is possible to make a dovetail on the base 4 regardless of the presence of the movable cradle 10. It becomes.

As shown in FIG. 10, the seismic isolation device 1 of the present invention can be installed between the anchor shaft 6 embedded in the ground and the foundation 2 in addition to between the foundation 2 and the base 4. it can.
FIGS. 11-19 shows the seismic isolation apparatus of 6th Example.
As is apparent from FIG. 1, the seismic isolation device of the sixth embodiment includes an anchor member 72 instead of the anchor shaft 6 described above, and this anchor member 72 is a circular base plate disposed on the upper surface of the foundation 2. 74 and a hollow screw shaft 76 standing vertically from the center of the base plate 74. A screw is cut on the outer peripheral surface of the screw shaft 76 over its entire length, and the screw shaft 76 is welded to the base plate 74 at its lower end.

As is clear from FIG. 12, the base plate 74 has a pair of through holes 78 a and 78 b, and can be fixed to the base 2 by screwing fixing bolts (not shown) into the base 2 through these through holes 78. .
The through hole 78 a is formed as a long hole extending in the radial direction of the base plate 74, while the through hole 78 b is formed as a long hole extending in the circumferential direction of the base plate 74.

Further, the fixing bolt described above may be an anchor shaft embedded in the foundation 2 in the same manner as the anchor shaft 6, and in this case, the base plate 74 is fastened to the anchor shaft via a fixing nut (not shown). .
On the other hand, the fixed cradle 10 has a circular metal plate shape, and a screw hole 80 corresponding to the screw shaft 76 of the anchor member 72 is formed through the center thereof. A pipe 82 is coaxially connected to the upper side. The pipe 82 extends vertically upward and has an inner diameter slightly larger than the screw shaft 76 of the anchor member 72. Therefore, the fixed cradle 10 is directly supported by the anchor member 72 by inserting the screw shaft 76 through the vibrator 82 and screwing the screw shaft 76 and the screw hole 80 together. The pipe 82 is fixed to the fixed cradle 10 at the lower end thereof, and the upper end of the screw shaft 76 is in a state of protruding from the pipe 82.

The fixed cradle 10 has an annular recess 84 formed on the upper surface thereof by pressing. The recess 84 is formed as a receiving surface 86 having an arcuate cross section surrounding the pipe 82 at the upper surface, and the receiving surface 86 is subjected to surface processing using Teflon (registered trademark) or grease.
Further, as shown in FIG. 13, the receiving surface 86 is formed with a plurality of fixing holes 88 penetrating the outer peripheral edge thereof, and these fixing holes 88 are used to prevent rotation of the fixed receiving base 10. used. That is, a spacer (not shown) is disposed between the fixed pedestal 10 and the base plate 74 of the anchor member 82, and a fixed pin (not shown) is driven into the spacer through the fixed hole 88. Is prevented from rotating.

Further, a pair of drain holes 90 are formed in the deepest portion of the receiving surface 86, and these drain holes 90 are separated from each other in the orthogonal direction of the fixed receiving base 10.
On the other hand, the movable pedestal 24 is also made of metal like the fixed pedestal 10 and is composed of an upper base portion 92 and a lower base portion 94. As is apparent from FIG. 14, the upper base portion 92 includes a rectangular upper plate 96 and a screw shaft 98 erected upward from the center of the upper plate 96. The screw shaft 98 is formed on the upper portion. A screw 100 is included. The screw shaft 98 is welded to the upper plate 96 at its lower end.

Therefore, as shown in FIG. 11, the screw shaft 98 of the upper plate 96 is screwed into the base 4 from its lower surface, and the upper plate 96 is directed to the lower surface of the base 4, so that the upper base portion 92 is coupled to the base 4. It is possible.
Further, through holes 102 are formed in the respective corners of the upper plate 96, and these through holes 102 are tapered holes having a small diameter on the lower side, as shown in FIG.

  On the other hand, as is apparent from FIG. 16, the lower base portion 94 has a hollow cylindrical shape, and its outer diameter is smaller than the outer diameter of the receiving surface 86 described above. The inside of the lower base portion 94 is formed as the aforementioned spring accommodating chamber 36, and the lower base portion 94 has a rectangular outer flange 104 at the upper end thereof. The outer flange 104 has the same size as the upper plate 96 and is coupled to the upper plate 96 in a state where the outer flange 104 is superimposed on the lower surface of the upper plate 96. That is, a screw hole 106 that matches the through hole 102 is formed at each corner of the outer flange 104, and the screw hole 106 has a tapered hole portion that forms an extension of the through hole 102 above the screw hole 106, and the tapered hole portion. And a female screw portion formed on the lower side. Therefore, the lower base portion 94 is coupled to the upper plate 96 via the outer flange 104 by screwing a countersunk screw (not shown) into the through hole 102 and the screw hole 106 that are matched to each other.

Further, the lower base portion 94 has an annular inner flange 108 at its lower end. The inner flange 108 protrudes into the lower base portion 94 and has a sufficiently larger inner diameter than the pipe 82 of the fixed cradle 10. Therefore, as is apparent from FIG. 1, the pipe 82 of the fixed cradle 10 is disposed in the spring accommodating chamber 36 with sufficient play between the pipe 82 and the inner flange 108.
As shown in FIGS. 16 and 17, the inner flange 108 is formed into a movable surface 110 having a convex bottom surface and a circular arc shape as shown in FIGS. The cradle 24 is supported by the movable surface 110 on the cradle surface 86 of the fixed cradle 10. Similar to the receiving surface 86, the movable surface 110 is also subjected to surface processing using Teflon (registered trademark) or grease.

The radius of curvature of the movable surface 110 is smaller than the radius of curvature of the receiving surface 86, and the diameter at the lowest central portion substantially matches the diameter of the deepest portion of the receiving surface 86.
The damping spring mechanism 45 in the sixth embodiment is disposed between the adjusting nut 52 screwed into the upper end of the screw shaft 76 in the anchor member 72 and the inner flange 108 described above. More specifically, the damping spring mechanism 45 is sequentially stacked on the inner flange 108 and includes large, medium, and small washers 112, 114, and 116 that surround the pipe 82 of the fixed cradle 10. It has an outer diameter approximately equal to the inner diameter of the platform portion 94. The washer 112, 114, 116 has an inner diameter that gradually decreases in this order, and the surface of each washer is subjected to surface processing using Teflon (registered trademark) or grease.

Further, on the uppermost washer 116, for example, three disc springs 118 surround the pipe 82 of the fixed cradle 10 and are stacked alternately in the vertical direction. These disc springs 118 are the same size and have an outer diameter smaller than the outer diameter of the washer 116, and the inner diameter is substantially equal to the outer diameter of the pipe 10.
Furthermore, a washer 120 and a disc spring 122 are disposed between the uppermost disc spring 118 and the adjustment nut 52, and the washer 120 and the disc spring 122 have a smaller diameter than the disc spring 118.

Even in the seismic isolation device of the sixth embodiment described above, when an earthquake occurs, the movable cradle 24 is relative to at least one of the horizontal direction and the vertical direction with respect to the fixed cradle 10 as shown in FIG. Displacement and contraction of the disc springs 118 and 122 constituting the damping spring can effectively attenuate and absorb the vibration energy of the earthquake.
Further, in the case of the sixth embodiment, the receiving surface 86 of the fixed cradle 10 is a recess made of an annular groove having a circular arc shape in cross section, and the movable surface 110 of the movable cradle 24 is an annular convex portion having a circular arc shape in cross section. Therefore, when the movable cradle 24 is relatively displaced in the horizontal direction, the movable cradle 24 is guided to the fixed cradle 10 on both sides of the screw shaft 76 of the anchor member 72, so that stable relative displacement is possible. Become. At this time, since the three washers 112, 114, 116 slide with each other, vibration energy can be consumed more efficiently, and the seismic isolation effect of the seismic isolation device is further enhanced.

  The washers 112, 114, 116 of the sixth embodiment can be incorporated in the seismic isolation devices of the first to fifth embodiments. In the case of the sixth embodiment, the fixed cradle 10 and the movable cradle. 24 can also have a receiving surface and a movable surface obtained by duplicating the receiving surface 86 and the movable surface 110 in the radial direction of the seismic isolation device, and in the case of the first and second embodiments, the receiving surface and It is also possible to multiplex the movable surface in the circumferential direction of the seismic isolation device.

It is sectional drawing which showed the seismic isolation apparatus of 1st Example. It is a top view of the fixed base in the seismic isolation apparatus of FIG. It is a partial side view of the movable cradle in the seismic isolation apparatus of FIG. It is a bottom view of the movable cradle in the seismic isolation apparatus of FIG. It is sectional drawing which shows the state which the seismic isolation apparatus of FIG. 1 act | operated. It is sectional drawing which showed the seismic isolation apparatus of 2nd Example. It is sectional drawing which showed the seismic isolation apparatus of 3rd Example. It is sectional drawing which showed the seismic isolation apparatus of 4th Example. It is the side view which showed the movable cradle of the seismic isolation apparatus in 5th Example. It is the figure which showed the other example of application of the seismic isolation apparatus of this invention. It is sectional drawing which showed the seismic isolation apparatus of 6th Example. It is the top view which showed the anchor member of FIG. It is the top view which showed the fixed cradle of FIG. It is the top view which showed the movable cradle of FIG. It is sectional drawing which follows the XV-XV line | wire in FIG. It is sectional drawing of the movable cradle of FIG. It is a bottom view of the movable cradle of FIG. It is the one part sectional view which shows the state where the seismic isolation device of FIG. 11 act | operated.

Explanation of symbols

2 Foundation (fixed base)
4 foundation (support)
6 Anchor shaft 10 Fixed cradle (fixing member)
16, 56, 86 Receiving surface 24 Movable cradle (movable member)
38,110 Movable surface 42 Rib (spring seat)
44 steps (spring seat)
46 Washer (Spring Seat)
45 Damping spring mechanism 48, 49, 50 Belleville spring (damping spring)
52 Adjustment nut (spring seat)
62 Fastening nut 64 Washer 66 Screw hole 70 Notch 72 Anchor member 76 Screw shaft 112, 14, 116 Washer 118, 122 Disc spring (damping spring)

Claims (7)

In the seismic isolation device provided between the fixed base and the building support,
An anchor member standing from the fixed base and having a shaft portion extending upward;
A fixing member supported by the anchor member, having a concave receiving surface on an upper surface thereof, and projecting the shaft portion of the anchor member upward from the receiving surface;
A convex movable surface that is attached to the support base and is received by the receiving surface of the fixed member in a state where the shaft portion of the anchor member is loosely inserted on a lower surface thereof, the movable surface being the receiving surface. A movable member allowed to be displaced relative to the fixed member in a horizontal direction and a vertical direction by being guided by a surface;
Provided between the shaft portion of the anchor member and the movable member, and when the movable member is relatively displaced, maintains the contact of the movable surface with the receiving surface and reduces the relative displacement of the movable member. A seismic isolation device comprising a damping spring mechanism for damping.   The seismic isolation device according to claim 1, wherein the receiving surface and the movable surface are formed from a part of a spherical surface.   The seismic isolation device according to claim 1, wherein the receiving surface and the movable surface are formed of a tapered surface.   The seismic isolation device according to claim 1, wherein the receiving surface and the movable surface are formed from a circular arc surface having an annular shape.   The seismic isolation device according to any one of claims 1 to 4, wherein the damping spring mechanism includes a plurality of disc springs arranged so as to be vertically stacked around the shaft portion of the anchor member.   The seismic isolation device according to claim 5, wherein the damping spring mechanism is attached to the shaft portion of the anchor member so as to be adjustable in a vertical position, and further includes a spring seat for the disc spring. .   The seismic isolation device according to claim 1, wherein the fixed base is a concrete foundation, and the support base is a wooden base of a wooden house as the building.

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