JP3685706B2 - Seismic isolation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device that is interposed between a foundation and a building and supports the building so as to be movable in the horizontal direction.
[0002]
[Prior art]
As a device for protecting a building from an earthquake, there is known a seismic isolation device that is interposed between the foundation and the building and protects the building by not transmitting the shaking caused by the earthquake to the building. In recent years, the number of buildings where this seismic isolation device is installed tends to increase. There are seismic isolation devices that use elastic materials to make use of their elasticity, and those that have a structure in which a ball installed on the building rolls on a support plate fixed on the foundation side. In particular, the latter seismic isolation device tends to increase its use because it can be applied to a detached house to which the former seismic isolation device is difficult to apply.
[0003]
In the seismic isolation device having a structure in which the ball installed on the building side rolls on the support plate fixed on the foundation side, as shown in, for example, JP-A-10-88857, The ball was smoothly rolled by interposing a lubricant between the ball and the holding body fixed to the building and holding the ball.
[0004]
[Problems to be solved by the invention]
However, it is necessary to smooth the rolling of the ball so as not to transmit the earthquake vibration to the building. However, if the rolling of the ball is too smooth, a cause other than the earthquake, for example, a strong wind blows. However, there is a problem that the building is moved or the shaking of the building cannot be stopped for a long time after the earthquake stops.
[0005]
The present invention has been made in view of the above-described circumstances, and the object of the present invention is to provide a seismic isolation device in which a building does not move due to strong winds or the shaking of a building after an earthquake does not stop for a long time. Is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, in the invention according to claim 1, in the seismic isolation device interposed between the foundation and the building and supporting the building so as to be movable in the horizontal direction, the seismic isolation device includes a support plate that will be formed into a conical shape fixed and the surface on the foundation is inclined downward toward the center, when said fixed to a building is and said foundation and said building is relatively displaced A ball holder that rotatably holds a ball that rolls on the support plate, and the ball holder includes a ball holding cylinder in which a ball holding recess for holding the ball rotatably is formed. A sliding bearing in which a resin sliding layer is impregnated in a hole of a porous metal layer fixed to the center of the inner surface of the ball holding cylinder and applied to the surface of the steel back metal, and the ball is held in the ball holding recess To open the ball holding recess. A drop-off prevention material attached to the part, and a dust-proof frame attached to the drop-off prevention material so that dust or the like does not enter the ball holding recess from a gap generated between the drop-off prevention material and the ball, A hole for adjusting the contact area between the ball and the slide bearing is formed in the approximate center of the slide bearing . With this configuration, the building does not move with a minute force such as wind pressure due to sliding frictional resistance between the sliding bearing and the ball, and the building is built for a long time after the earthquake stops. Since the shaking of the object does not stop, the people in the building will not have any discomfort. In addition, since the hole is drilled at the center of the slide bearing, the contact area between the ball and the slide bearing can be adjusted, and the sliding friction when the ball and the slide bearing slide using the surface pressure dependence. The resistance can be adjusted. In addition, since the outer periphery of the hole drilled in the center of the dust-proof frame is in close contact with the surface of the ball protruding from the drop-off prevention material, the gap between the drop-off prevention material and the ball is closed, and dust etc. Becomes difficult to invade.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, with reference to FIG. 1 thru | or FIG. 3, the seismic isolation apparatus 1 which concerns on embodiment is demonstrated. FIG. 1 is a cross-sectional view of a seismic isolation device 1 interposed between a foundation 30 and a building 31, and FIG. 2 is a plan view of a ball holder 2 constituting the seismic isolation device 1. 3 is a cross-sectional view taken along line AA in FIG.
[0008]
In FIG. 1, the seismic isolation device 1 is interposed between a foundation 30 and a building 31, and is fixed to the foundation 30 and has a support formed in a conical shape whose surface is inclined downward toward the center. A ball 3 that rolls on the support plate 4 when the plate 4, the foundation 30 and the building 31 are relatively displaced, and a ball holding recess 5 that is fixed to the building 31 and holds the ball 3 rotatably. And a ball holder 2 on which is formed.
[0009]
In FIG. 2, the ball holding body 2 is formed by integrally forming a substantially square upper plate 15 and a substantially cylindrical ball holding cylinder 16 by stainless steel casting in a plan view. Ribs 14 for increasing the strength of the ball holder 2 are formed at four locations on the outer periphery of the ball holding cylinder 16 from the ball holding cylinder 16 to the upper plate 15. Mounting seats 12 are formed at four corners of the upper plate 15, and mounting holes 13 for mounting the ball holder 2 to the building 31 are formed at the center of the mounting seat 12. .
[0010]
In FIG. 3, the inside of the ball holding cylinder 16 is formed as a ball holding recess 5 that holds the ball 3 rotatably, and a curved surface 17 is formed in a concave shape by a part of a spherical surface at the center of the upper surface. A slot 11 is formed in the approximate center of the curved surface 17. A sliding bearing 6 is attached to the curved surface 17 by bonding, caulking, or screws along the surface. Further, a hole 7 having a diameter substantially the same as that of the slot 11 is formed in the center of the slide bearing 6. The ball 3 held in the ball holding recess 5 is formed in a substantially spherical shape from stainless steel or bearing steel.
[0011]
The slide bearing 6 is formed by impregnating and coating the pores of the porous metal layer applied to the surface of the steel back metal and the impregnation coating composition on the surface thereof. This impregnation coating composition is formed as a surface sliding layer on which the ball 3 slides. For example, the impregnation coating composition is made of a material impregnated with various solid lubricants using polytetrafluoroethylene (PTFE) as a base resin. It is configured. Such a sliding bearing is excellent in friction and wear characteristics, heat resistance, mechanical strength, etc., so that it is good even when the sliding bearing 6 is used under severe conditions such as a wide temperature range and high load. Excellent sliding characteristics can be maintained.
[0012]
On the other hand, as shown in FIG. 1, the support plate 4 fixed to the foundation 30 has a substantially square bottom plate 21 and a substantially circular rolling surface 19 integrally formed of stainless steel in plan view. It is. The rolling surface 19 is formed in a conical shape that inclines downward toward the center, and a stop wall 20 projects from the entire outer periphery of the rolling surface 19 over the entire circumference. The inclination angle θ of the rolling surface 19 is set so as to satisfy the calculation formula of tan θ ≧ μ with the friction coefficient μ of the sliding bearing 6.
[0013]
Thus, assembling the seismic isolation device 1 using the above-described ball holder 2, ball 3 and support plate 4 is performed as follows. First, the ball 3 is placed in the ball holding recess 5 of the ball holder 2. At this time, a part of the ball 3 comes into contact with the slide bearing 6 attached to the curved surface 17. As described above, since the hole 7 is formed at substantially the center of the slide bearing 6, the contact area between the ball 3 and the slide bearing 6 can be adjusted, and the ball utilizing the surface pressure dependency can be adjusted. 3 and the sliding friction resistance when the slide bearing 6 slides can be adjusted.
[0014]
After the ball 3 is placed in the ball holding recess 5, it is attached by press-fitting a drop-off prevention material 8 into the opening of the ball holding recess 5. This drop-off prevention material 8 is made of stainless steel, and its longitudinal section is L-shaped, and a hole is formed in the center to form an annular shape. When press-fitting, after inserting the vertical part of the outer periphery of the drop-off prevention member 8 in contact with the inner surface of the ball holding recess 5, press-fitting until the horizontal plane is almost at the same position as the tip surface of the ball holding cylinder 16. To do. As described above, when the drop-off prevention member 8 is attached to the ball holding recess 5, a part of the ball 3 protrudes outward from the ball holding recess 5.
[0015]
After the fall prevention material 8 is attached, a dust proof frame 9 is attached on the fall prevention material 8 so that dust or the like does not enter the ball holding recess 5 from a gap formed between the fall prevention material 8 and the ball 3. The dust-proof frame 9 is formed of a rubber or plastic thin plate, and is formed in an annular shape with a hole formed in the center. In order to attach the dust-proof frame 9 to the drop-off prevention material 8, an attachment screw 10 is inserted into an attachment hole (not shown) drilled in the dust-proof frame 9 and an attachment screw hole (not shown) drilled in the fall-off prevention material 8. ). Since the outer periphery of the hole drilled in the center of the dust-proof frame 9 attached in this way is in close contact with the surface of the ball 3 protruding from the drop-off prevention member 8, the gap between the drop-off prevention member 8 and the ball 3 is closed, It becomes difficult for dust or the like to enter the ball holding recess 5. The dustproof frame 9 may be screwed to the tip surface of the ball holding cylinder 16.
[0016]
After attaching the dust-proof frame 9, the mounting bolt 18 is inserted into the mounting hole 13 of the ball holder 2 and screwed into a mounting screw hole (not shown) drilled in the lower surface of the building. 2 will be attached to the building.
[0017]
On the other hand, the support plate 4 is attached to the foundation 30 by screwing a mounting bolt 22 inserted through the mounting hole 13 of the support plate 4 into an attachment screw hole (not shown) drilled in the foundation 30. And the seismic isolation apparatus 1 is assembled by mounting the ball holder 2 attached to the building 31 on the support plate 4 attached to the foundation 30, and the foundation 30 and the building 31 It will be inserted between.
[0018]
Thus, when the foundation 30 and the building 31 provided with the seismic isolation device 1 assembled as described above are affected by the earthquake, the support plate 4 fixed to the foundation 30 rolls and the support plate 4 The ball 3 rolls on the rolling surface 19 of the support plate 4 by rolling. In this way, rolling of the ball 3 on the rolling surface 19 absorbs the rolling motion, so that the shaking due to the earthquake is not easily transmitted to the building 31 and the building 31 is protected from the earthquake. At this time, as described above, since the stop wall 20 protrudes from the outer peripheral edge of the rolling surface 19 of the support plate 4 over the entire circumference, the ball 3 rolls even if extremely large shaking occurs. It does not fall from the surface 19. After the earthquake stops, the building 31 slightly swings on the rolling surface 19 via the ball 3, and this swing is gradually caused by the sliding frictional resistance between the sliding bearing 6 and the ball 3. After the convergence, the building 31 will stop at the original position with respect to the foundation 30 due to the inclination angle of the rolling surface 19.
[0019]
In this way, the sliding bearing 6 between the sliding bearing 6 and the ball 3 is attached to the inner upper surface of the ball holding recess 5 because the sliding bearing 6 on which the ball 3 slides when the ball 3 rolls is attached. Due to the resistance, the shaking of the building 31 does not stop for a long time after the earthquake stops, and the building 31 does not move with a minute force such as wind pressure. No one has any discomfort. As described above, since the slot 11 and the hole 7 are formed in the approximate center of the curved surface 17 of the ball holder 2 and the approximate center of the slide bearing, the ball 3 is connected to the slide bearing 6. Dust generated when sliding can be accommodated in the slot 11 and the hole 7 and is not scattered in the ball holding recess 5. In order to adjust the sliding frictional resistance between the ball 3 and the slide bearing 6, the slot 11 and the hole 7 described above may not be formed.
[0020]
In the above-described embodiment (hereinafter referred to as the first embodiment), the support plate 4 of the seismic isolation device 1 has been shown to be attached to the surface of the foundation 30, but is attached to the surface of the foundation 30. Not limited to this, it may be embedded in the foundation 30 at a position that does not protrude from the surface of the foundation 30. Such an embodiment (hereinafter referred to as a second embodiment) will be described with reference to FIG. FIG. 4 is a cross-sectional view of the seismic isolation device 1 according to the second embodiment. In addition, the same code | symbol was attached | subjected to the components same as 1st Embodiment which concerns on the above-mentioned seismic isolation apparatus 1. FIG.
[0021]
In FIG. 4, the support plate 4 is formed of a thin plate of stainless steel and includes a substantially circular rolling surface 19 in a plan view and a stop wall 20 formed on the outer peripheral edge of the rolling surface 19. ing. The rolling surface 19 is formed in a conical shape inclined downward toward the center (the same inclination angle θ as that of the first embodiment is set), and the stop wall 20 extends over the entire circumference of the rolling surface 19. Projected. As shown in FIG. 4, the support plate 4 is embedded in the foundation 30 with the upper end surface of the stop wall 20 and the surface of the foundation 30 being substantially flush with each other. Thus, as in the first embodiment, the seismic isolation device 1 is assembled by placing the ball holder 2 attached to the building 31 on the support plate 4 embedded in the foundation 30. It will be interposed between the building 31. In this way, by embedding the support plate 4 in the foundation 30, the support plate 4 does not become an obstacle when constructing a building, so that it is easy to install, and space saving is required for mounting the seismic isolation device. Can do. Although the support plate 4 according to the second embodiment described above is formed of a thin stainless steel plate, the support plate 4 according to the first embodiment is replaced with the upper end surface of the stop wall 20 and the foundation 30. It may be embedded in the foundation 30 in a state where the surface is substantially the same surface.
[0022]
Further, in the first embodiment and the second embodiment described above, the support plate 4 of the seismic isolation device 1 has been shown to have a conical shape in which the rolling surface 19 is inclined downward toward the center. It is not limited to a conical shape that is inclined downward toward the center, but may be a flat shape. Such an embodiment (hereinafter referred to as a third embodiment) will be described with reference to FIG. FIG. 5 is a cross-sectional view of the seismic isolation device 1 according to the third embodiment. In addition, the same code | symbol was attached | subjected to components which have the same function as 1st Embodiment and 2nd Embodiment which concern on the above-mentioned seismic isolation apparatus 1. FIG.
[0023]
In FIG. 5, in the seismic isolation device 1 according to the third embodiment, the ball holder 2 and the ball 3 attached to the building 31 have exactly the same shape as in the first embodiment. On the other hand, the support plate 4 attached to the foundation 30 has exactly the same shape except that the rolling surface 19 of the support plate 4 of the seismic isolation device 1 in the first embodiment is a horizontal plane. Further, the difference between the third embodiment and the first and second embodiments is that the return damper member 23 is installed in the third embodiment. In FIG. 5, return damper members 23 are installed across the foundation 30 and the building 31 on both the left and right sides of the seismic isolation device 1 according to the third embodiment. The return damper member 23 includes two upper and lower flange portions 25 attached to the foundation 30 and the building 31, and an elastic portion 24 that is formed of an elastic member such as rubber and connects the two flange portions 25. ing. The return damper member 23 is attached by inserting a mounting bolt (not shown) through a mounting hole (not shown) drilled in the flange portion 25 and screwing it to the foundation 30 and the building 31 respectively. Yes, it works to return the building 31 to its original position when the shaking of the building 31 after the earthquake stops. That is, after the earthquake stops, the building 31 slightly swings on the rolling surface 19 via the ball 3. This swing is caused by the restoring force of the elastic portion 24 of the return damper member 23 and the sliding bearing 6. The ball 31 gradually converges due to the sliding frictional resistance between the ball 3 and the building 31 eventually returns to its original position with respect to the foundation 30 when the elastic portion 24 of the return damper member 23 returns to its original shape. Will stop. In addition, although the thing attached to the right and left both sides of the seismic isolation device 1 was shown as the return damper member 23, it is not restricted to what is attached to the left and right both sides of the seismic isolation device 1, but between the foundation 30 and the building 31. It may be attached at an arbitrary position.
[0024]
Moreover, in above-described 3rd Embodiment, although the rolling surface 19 of the support plate 4 showed what was formed in the horizontal surface, it was not restricted to what was formed in the horizontal surface, 1st Embodiment and 2nd Embodiment. Similarly, the rolling surface 19 of the support plate 4 may be formed in a conical shape inclined downward toward the center.
[0025]
In addition, this invention is not limited to above-described embodiment, In the range which does not deviate from a summary, it can change suitably and can implement.
[0026]
As mentioned above, although embodiment was described in detail, in this embodiment, in the seismic isolation apparatus 1 which is interposed between the foundation 30 and the building 31, and supports this building 31 so that a movement in a horizontal direction is possible. The seismic isolation device 1 is mounted on the support plate 4 when the support plate 4 is fixed to the foundation 30 and the building 31 is fixed and the foundation 30 and the building 31 are relatively displaced. A ball holding body 2 formed with a ball holding recess 5 for rotatably holding the ball 3 rolling, and a slide bearing 6 abutting on the ball 3 is provided on the inner upper surface of the ball holding recess 5. Due to the mounting, the building 31 does not move with a minute force such as wind pressure due to the sliding frictional resistance between the sliding bearing 6 and the ball 3, and for a long time after the earthquake stops. The rock of the building 31 Because there is no that will not stop, does not have the discomfort a person in the building 31.
[0027]
Further, in the present embodiment, the support plate 4 is formed in a conical shape in which the rolling surface 19 on which the ball 3 rolls is inclined downward toward the center, so that a small force such as wind pressure can be used. Since the building 3 does not move when the ball 3 in the ball holder 2 moves up the rolling surface 19, a person inside the building 31 does not have an uncomfortable feeling. Further, since the rolling surface 19 is inclined downward toward the center, the shaking of the building 31 after the earthquake is attenuated toward the center of the support plate 4 and finally the building 31 with respect to the foundation. It can be stopped at the original position.
[0028]
Further, in the present embodiment, the support plate 4 has a rolling surface 19 on which the ball 3 rolls in a flat shape, while the foundation 30 and the building 31 are provided with the foundation. When the damper 31 for return for connecting the building 31 to the position before the displacement with respect to the foundation 30 is connected and attached when the building 30 and the building 31 are relatively displaced, Since the building 31 can be returned to the position before displacement with respect to the foundation 30 by the return damper member 23, the rolling surface 19 of the support plate 4 may be formed in a planar shape. Thus, since it is sufficient to form the rolling surface 19 in a planar shape, the support plate 4 can be easily manufactured, and the manufacturing cost of the support plate 4 can be reduced.
[0029]
In the present embodiment, the support plate 4 is embedded in the foundation 30 at a position where the support plate 4 does not protrude from the surface of the foundation 30. Since it does not become an obstacle, construction is easy, and space saving for mounting the seismic isolation device 1 can be achieved.
[0030]
Further, in the present embodiment, the plain bearing 6 is formed by impregnating and coating the pores of the porous metal layer applied to the surface of the steel back metal and the impregnation coating composition on the surface thereof. It is possible to form a sliding bearing excellent in friction and wear characteristics, heat resistance, mechanical strength, etc., and is excellent even when the sliding bearing 6 is used under severe conditions such as a wide temperature range and a high load. Excellent sliding characteristics can be maintained.
[0031]
【The invention's effect】
As is apparent from the above description, in the invention according to claim 1, in the seismic isolation device interposed between the foundation and the building and supporting the building so as to be movable in the horizontal direction, seismic isolation device is fixed to said base and a support plate that will be formed in a conical shape with its surface is inclined downward toward the center, secured to said building and said base and said building and is relatively displaced A ball holding body that rotatably holds a ball that rolls on the support plate, and the ball holding body is formed with a ball holding recess that holds the ball rotatably. A slide bearing in which a resin sliding layer is impregnated in a pore of a porous metal layer fixed to the center of the inner surface of the ball holding cylinder and applied to the surface of the steel back metal, and the ball is held in the ball holding recess The ball A drop-off prevention material attached to the opening of the recess, and a dust-proof frame attached to the drop-off prevention material so that dust or the like does not enter the ball holding recess from a gap generated between the drop-off prevention material and the ball. And a hole for adjusting a contact area between the ball and the slide bearing is formed at substantially the center of the slide bearing . With this configuration, the building does not move with a minute force such as wind pressure due to sliding frictional resistance between the sliding bearing and the ball, and the building is built for a long time after the earthquake stops. Since the shaking of the object does not stop, the people in the building will not feel uncomfortable. In addition, since the hole is drilled in the center of the slide bearing, the contact area between the ball and the slide bearing can be adjusted, and the sliding friction when the ball and the slide bearing slide using the surface pressure dependence. The resistance can be adjusted. Furthermore, since the outer periphery of the hole drilled in the center of the dust-proof frame is in close contact with the surface of the ball protruding from the drop-off prevention material, the gap between the drop-off prevention material and the ball is closed, and dust etc. Becomes difficult to invade.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a seismic isolation device interposed between a foundation and a building.
FIG. 2 is a plan view of a ball holder constituting the seismic isolation device.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a cross-sectional view of a seismic isolation device according to a second embodiment.
FIG. 5 is a cross-sectional view of a seismic isolation device according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Ball holding body 3 Ball 4 Support plate 5 Ball holding recessed part 6 Slide bearing 17 Curved surface 19 Rolling surface 20 Stop wall 23 Return damper member 24 Elastic part 25 Flange part 30 Foundation 31 Building

Claims (1)

In the seismic isolation device that is interposed between the foundation and the building and supports the building so as to be movable in the horizontal direction,
該免Isolation System includes a support plate fixed and the surface to the underlying Ru is formed into a conical shape inclined downward toward the center, secured to the building is and said foundation and said building is relatively A ball holder that rotatably holds a ball that rolls on the support plate when displaced,
The ball holding body includes a ball holding cylinder formed with a ball holding recess for rotatably holding the ball, and a porous metal layer fixed to the center of the inner surface of the ball holding cylinder and applied to the surface of the steel back metal. A slide bearing in which a resin sliding layer is impregnated in the pores; a drop-off prevention material attached to the opening of the ball holding recess while holding the ball in the ball holding recess; and the drop-off prevention material and the ball A dust-proof frame attached to the drop-off prevention material so that dust or the like does not enter the ball holding recess from a gap generated between
A seismic isolation device , wherein a hole for adjusting a contact area between the ball and the slide bearing is formed at substantially the center of the slide bearing .

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