JP3694982B2 - Seismic isolation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support device for supporting a structure such as a building, and more specifically, to a sliding type seismic isolation device for protecting and supporting the structure from vibration based on an earthquake or the like.
[0002]
[Problems to be solved by the invention]
The seismic isolation bearing device comprising a laminated rubber body formed by alternately laminating reinforcing layers and rubber layers is arranged between the upper structure and the lower structure or the ground, and supports the upper structure. Moreover, it is used to reduce the transmission of vibrations such as earthquakes to the upper structure and to attenuate the vibrations of the upper structure. As such a seismic isolation bearing device, the origin return type used by fixing the upper end surface and the lower end surface to the upper structure and the lower structure or the ground respectively, and either the upper end surface or the lower end surface are used. A sliding type that is fixed to one of the upper structure and the lower structure or the ground, and the other is slidably displaced with respect to the other of the upper structure and the lower structure or the ground. There is.
[0003]
The sliding-type seismic isolation device slidably abuts one end face of the laminated rubber body and the mating member, and the upper structure vibrates due to the relative sliding displacement of the abutting face. Therefore, if the frictional resistance at the sliding contact surface is large, not only small-scale earthquakes, but also earthquake vibrations with relatively large accelerations, slip displacement will not be desired. Protection of superstructures against vibrations such as earthquakes may not be obtained as desired.
[0004]
In addition, if the mating material is made of metal such as steel, if it is left for a long period of time, the sliding contact surface may be corroded and rust may be generated, which causes friction on the sliding contact surface. The resistance increases and therefore the above disadvantages are likely to occur gradually in long term use.
[0005]
The present invention has been made in view of the above points, and the object of the present invention is to reduce frictional resistance on the sliding contact surface and to ensure easy sliding displacement on the sliding contact surface. As a result, transmission to the upper structure can be reduced not only for medium-scale earthquakes but also for vibrations caused by small-scale earthquakes, etc., and reliable protection of the upper structure can be achieved. The object is to provide a sliding type seismic isolation device.
[0006]
[Means for Solving the Problems]
According to the present invention, the object is to laminate a reinforcing rubber layer and a rubber layer alternately and can be shear-deformed in the horizontal direction, a sliding material attached to one end surface of the laminated rubber body, And a reinforcing layer disposed on at least one of the plurality of thin reinforcing plates and the upper and lower surfaces of the laminated rubber body. And a thick reinforcing plate embedded in the rubber layer, the rubber layer is formed to cover the outer peripheral edge of the reinforcing layer, and the sliding material is partially embedded in the thick reinforcing plate. It consists of a plate mainly composed of polytetrafluoroethylene resin mixed with reinforcing fibers or reinforcing materials attached to one end face of the laminated rubber body, and the inclusion is integrated with the inclusion body and one surface of the inclusion body. And a low friction layer that is formed, Through the friction layer is accomplished by seismic isolation bearing device that slidably contact with the skids.
[0007]
Polytetrafluoroethylene resin can be exemplified as one of the materials for forming the low friction layer, but other low friction materials may be used. The low friction layer, for example, uniformly disposes polytetrafluoroethylene resin powder etc. on one side of the interposer body, melts and burns it, or interposes a polytetrafluoroethylene resin thin film (film or sheet) It is formed by adhering to one surface of the body body with an adhesive or the like. The low friction layer is preferably formed to have a thickness of several hundred microns to several millimeters so that a large cold flow or the like does not occur due to the load to be supported. Not. In a preferred example, the low friction layer is disposed on one surface of the inclusion body so that the relative slidable amount via the low friction layer in the relative sliding of the sliding material with respect to the inclusion in all horizontal directions is 10 cm or more. To form.
[0008]
Sliding material, mainly composed of polytetrafluoroethylene resin, and a contaminating plate body reinforcing fibers or reinforcing materials such as glass fibers.
[0009]
In the present invention, a reinforcing layer of a laminated rubber body is configured by including a plurality of thin reinforcing plates and at least one thick reinforcing plate, and the thick reinforcing plates are arranged on either the upper or lower surface of the laminated rubber body. Then, a part of the sliding material may be embedded in the thick reinforcing plate, and the sliding material may be attached to one end surface of the laminated rubber body.
[0010]
This seismic isolation bearing device is arranged between the upper structure and the lower structure or the ground, and is used to support the upper structure in isolation. Alternatively, it may be arranged on the lower structure side or the ground side instead. When placing the inclusion on the upper structure side, the lower part of the upper structure itself may be implemented as an inclusion, while when placing the inclusion on the lower structure side or the ground side, You may implement the concrete base itself of the upper part of a substructure, or the ground side as an intervening body.
[0011]
Since this seismic isolation bearing device is a sliding type, it is difficult to completely return the upper structure to the origin (initial installation position) only with the origin return capability of the device itself. An origin return type laminated rubber bearing device or a horizontal spring device made of a laminated rubber body using damping rubber may be used in combination with the seismic isolation bearing device.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention and the embodiments of the present invention will be described in more detail based on preferred embodiments shown in the drawings. The present invention is not limited to these examples.
[0013]
【Example】
In FIG. 1, the seismic isolation bearing device 1 of this example includes a laminated rubber body 4 in which reinforcing layers 2 and rubber layers 3 are alternately laminated, and a sliding material 6 attached to an upper end surface 5 of the laminated rubber body 4. And an interposition body 7 slidably in contact with the sliding member 6 in the horizontal direction, and a mounting plate 9 attached to the lower end surface 8 of the laminated rubber body 4.
[0014]
The reinforcing layer 2 includes a plurality of thin reinforcing steel plates 21 and a thick reinforcing steel plate 24 embedded in the upper end surface 22 of the rubber layer 3, and the rubber layer 3 made of natural rubber or the like has an outer peripheral edge of the reinforcing layer 2. The rubber layer 3 and the reinforcing layer 2 are bonded to each other by vulcanization bonding or the like. Note that the rubber layer 3 may be formed using a high damping rubber.
[0015]
The sliding member 6 is attached to the upper end surface 5 of the laminated rubber body 4 with a part embedded in the thick reinforcing plate 24 so as not to be displaced in the horizontal direction. The sliding material 6 of this example is composed of a plate-like member mainly composed of polytetrafluoroethylene resin, but instead of this, a steel plate and a side of the steel plate that is slidably contacted with a low friction layer 33 described later. The entire surface may be provided with a sliding layer formed in the same manner with the same material as that for forming the low friction layer 33.
[0016]
The interposer 7 includes a steel interposer body 31 and an incompressible low friction layer 33 integrally formed on one whole surface 32 of the interposer body 31. Is slidably in contact with the sliding member 6 via the low friction layer 33. The low friction layer 33 is formed by melting and baking polytetrafluoroethylene resin powder on one surface 32 of the interposition body 31 or bonding a polytetrafluoroethylene resin thin film with an adhesive or the like.
[0017]
In this example, the sliding material 6 and the interposition body 7 are formed so that the lower surface 27 of the low friction layer 33 is wider than the upper surface 26 of the sliding material 6 by 10 cm or more in the entire horizontal direction. Therefore, the relative slidable amount (relative sliding displacement possible distance) of the sliding material 6 with respect to the interposed body 7 via the low friction layer 33 in the relative sliding (relative sliding displacement) of the sliding material 6 with respect to the interposed body 7 in all horizontal directions. It is designed to be 10 cm or more. It is not necessary to form the low friction layer 33 on the entire surface 32 of the interposer body 31. When the relative slidable amount is 10 cm or more, the low friction layer 33 is formed only in that region. May be.
[0018]
The mounting plate 9 formed of a steel plate or the like includes a plate-like base portion 41 and a reinforcing portion 42 formed integrally with the plate-like base portion 41, and the reinforcing portion 42 is formed on the lower end surface 23 of the rubber layer 3. Thus, the mounting plate 9 is prevented from sliding in the horizontal direction with respect to the lower end surface 8 of the laminated rubber body 4.
[0019]
The above seismic isolation bearing device 1 is disposed, for example, between the upper structure 51 and the foundation 52 of the ground, and the interposition body 7 is fixed to the upper structure 51 with bolts or the like, and the mounting plate 9 is attached to the foundation 52. It is fixed by anchor bolts or the like, and is used so as to support the upper structure 51 in isolation. In the event of a microearthquake (vibration with small vibration acceleration), there is no relative sliding displacement in the horizontal direction between the inclusion 7 and the sliding material 6 due to the frictional force therebetween, and the laminated rubber body 4 is in the horizontal direction. The vibration energy due to the microearthquake is attenuated by the shear deformation and the transmission of vibration to the upper structure 51 is reduced. In the case of a relatively large earthquake (vibration with a large vibration acceleration), the sliding material 6 slides and displaces in the horizontal direction with respect to the inclusions 7, and vibration due to this large earthquake is not transmitted to the superstructure 51, but slip displacement The vibrational energy of the laminated rubber body 4 and the shear deformation in the horizontal direction of the laminated rubber body 4 attenuate the vibration energy, thereby effectively protecting the upper structure 51 from the vibration.
[0020]
By the way, in the seismic isolation bearing device 1, since the sliding member 6 is in contact with the interposition body 7 via the low friction layer 33, it is easily slid and displaced in the horizontal direction with respect to the interposition body 7. Even in an earthquake, a horizontal relative sliding displacement can be generated between the inclusion 7 and the sliding member 6, and the upper structure 51 can be effectively protected from vibrations of this small-scale earthquake. . Further, since one surface 32 of the steel inclusion body 31 is covered with the low friction layer 33, there is no influence even if rust or the like occurs in the inclusion body 31 itself in long-term use. The seismic isolation effect can be maintained for a long time.
[0021]
Note that the seismic isolation bearing device 1 has a sufficient function of returning the upper structure 51 to the initial setting position (origin position) after a horizontal relative sliding displacement occurs between the interposition body 7 and the sliding material 6. Not. In order to compensate for this, as shown in FIG. 2, a spring device 1 that generates a spring force in the horizontal direction between the upper structure 51 and the foundation 52 may be juxtaposed to the seismic isolation bearing device 1. As shown in FIG. 3, an origin return type laminated rubber bearing device 62 may be juxtaposed. The origin return type laminated rubber bearing device 62 shown in FIG. 3 includes a laminated rubber body 65 similar to the laminated rubber body 4, and upper and lower mounting plates 66 and 67 fixed to the upper and lower surfaces of the laminated rubber body 65. The mounting plate 66 is fixed to the upper structure 51 with bolts or the like, and the lower mounting plate 67 is fixed to the base 52 with anchor bolts or the like. In this case, the rubber layer of the laminated rubber body 65 may be formed using a high-attenuation rubber, or lead may be encapsulated by penetrating the laminated rubber body 65 in the laminating direction. Good.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the frictional resistance on the sliding contact surface, to ensure easy sliding displacement on the sliding contact surface, and of course for a medium-scale earthquake. In addition, it is possible to reduce the transmission to the superstructure against vibrations caused by a small-scale earthquake or the like, and to achieve reliable protection of the superstructure.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention.
FIG. 2 is an explanatory diagram of another usage example of the example of FIG. 1;
FIG. 3 is an explanatory diagram of still another usage example of the example of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seismic isolation bearing device 2 Reinforcement layer 3 Rubber layer 4 Laminated rubber body 6 Sliding material 31 Interposition body 33 Low friction layer

Claims (5)

A laminated rubber body in which reinforcing layers and rubber layers are alternately laminated and can be shear-deformed in the horizontal direction, a sliding material attached to one end surface of the laminated rubber body, and slidable with respect to the sliding material The reinforcing layer is disposed on at least one of a plurality of thin reinforcing plates and an upper surface and a lower surface of the laminated rubber body, and is thick and embedded in the rubber layer. The rubber layer is formed so as to cover the outer peripheral edge of the reinforcing layer, and the sliding material is partly embedded in the thick reinforcing plate and attached to one end surface of the laminated rubber body. The reinforcing body is composed of a plate body mainly composed of polytetrafluoroethylene resin mixed with a reinforcing material, and the interposed body includes an interposed body main body and a low friction layer integrally formed on one surface of the interposed body main body. The inclusions are slid onto the sliding material via the low friction layer. Freely seismic isolation bearing device abuts.   The low friction layer is formed on one surface of the inclusion body so that the relative slidable amount through the low friction layer in the relative sliding of the sliding material with respect to the inclusion in all horizontal directions is 10 cm or more. The seismic isolation bearing device according to Item 1.   The seismic isolation bearing device according to claim 1, wherein the low friction layer is made of polytetrafluoroethylene resin.   A seismic isolation bearing device that is arranged between an upper structure and a lower structure or the ground and is used for base isolation support of the upper structure, the interposer being the upper structure side or the lower structure The seismic isolation bearing device according to any one of claims 1 to 3, which is arranged on a side or a ground side.   The seismic isolation bearing according to any one of claims 1 to 4, wherein the seismic isolation bearing is used in combination with a horizontal spring device or an origin return type laminated rubber bearing device arranged between the upper structure and the lower structure or the ground. apparatus.

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