JPH09310408A - Base isolation supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a slidable base isolation supporting device as being capable of reducing frictional resistance on a slidable contact plane, ensuring easy slide displacement on the slidable contact plane, less transmitting the vibration of medium or even small scale earthquake to an upper structure and surely protecting the upper structure. SOLUTION: A base isolation supporting device 1 has a laminated rubber 4 formed by alternately laminating reinforcing layers 2 and rubber layers 3, a slide material 6 mounted on the upper end face 5 of the laminated rubber 4 and an inclusion 7 put in slide movably with respect to the slide material 6 in the horizontal direction. The inclusion 7 contains an inclusion mainbody 31 and a low friction layer 33 integrally formed on one face 32 of the inclusion mainbody 31. The inclusion 7 is put in slidable contact with the slide material 6 via the low friction layer 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting device for supporting a structure such as a building, and more specifically, a sliding type device for supporting such a structure while protecting it from vibration due to an earthquake or the like. Of seismic isolation bearing device.

[0002]

A seismic isolation bearing device including a laminated rubber body in which a reinforcing layer and a rubber layer are alternately laminated is disposed between an upper structure and a lower structure or the ground. Is used to support the upper structure, reduce the transmission of vibration such as an earthquake to the upper structure, and damp the vibration of the upper structure. As such a seismic isolation bearing device, a return-to-origin type device whose upper end surface and lower end surface are fixed to an upper structure and a lower structure or the ground, respectively, and either one of the upper end surface and the lower end surface is used. , Fixed to either the upper structure and the lower structure or the ground,
There is a sliding type in which the other is slidably displaced with respect to the other of the upper structure and the lower structure or the ground.

In a slip-type seismic isolation bearing device, one end face of a laminated rubber body and a mating member are slidably brought into contact with each other, and the relative sliding displacement between the abutting faces causes an earthquake in the upper structure. Therefore, when the sliding contact surface has a large frictional resistance, the sliding displacement is desired not only in a small-scale earthquake but also in an earthquake vibration with a relatively large acceleration. In some cases, the protection of the superstructure against vibration such as an earthquake cannot be obtained as desired.

Further, if the mating member is made of metal such as steel, if it is left for a long period of time, its sliding contact surface may be corroded and rust may be generated. The frictional resistance on the surface is increased, and therefore the above-mentioned inconvenience is liable to occur during long-term use.

The present invention has been made in view of the above points, and an object of the present invention is to reduce frictional resistance on a sliding contact surface, thereby facilitating easy sliding displacement on the sliding contact surface. It is possible to reduce the transmission to the superstructure not only for medium-scale earthquakes but also for vibrations due to small-scale earthquakes, etc., and ensure reliable protection of the superstructure. It is to provide a slip-type seismic isolation bearing device that can be achieved.

[0006]

According to the present invention, the above object is to provide a laminated rubber body in which reinforcing layers and rubber layers are alternately laminated, and a sliding member attached to one end surface of the laminated rubber body. And an intermediate body slidably in contact with the sliding member, the intermediate body including an intermediate body and a low friction layer integrally formed on one surface of the intermediate body. And the interposer is achieved by a seismic isolation bearing that slidably abuts the sliding member via the low friction layer.

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 is formed by, for example, uniformly disposing polytetrafluoroethylene resin powder or the like on one surface of the main body of the interposer, melting and baking this, or interposing a polytetrafluoroethylene resin thin film (film or sheet). It is formed by adhering it to one surface of the body with an adhesive or the like. The low-friction layer is preferably formed to have a thickness of about a few hundred microns to a few millimeters in order to prevent a large cold flow or the like from being generated due to a supporting load, but the present invention is not limited to this. Not done. In a preferred example, the low-friction layer is provided on one surface of the interposer body so that the relative slidable amount through the low-friction layer in the relative sliding of the sliding material with respect to the intervening body in all horizontal directions is 10 cm or more. To form.

The sliding member may be composed mainly of polytetrafluoroethylene resin, and may be composed of a reinforcing fiber such as glass fiber or a plate member mixed with a reinforcing member depending on the case, but instead of this, a steel plate and this The steel sheet may be provided on one surface with a sliding layer formed in the same manner as the low friction layer by using the same forming material as the low friction layer.

According to the present invention, a plurality of thin reinforcing plates and at least one thick reinforcing plate are provided to form a reinforcing layer of the laminated rubber body, and the thick reinforcing plate is provided on either the upper or lower surface of the laminated rubber body. The sliding member may be arranged on one side and a part of the sliding member may be embedded in the thick reinforcing plate to attach the sliding member to one end surface of the laminated rubber body.

This seismic isolation bearing device is arranged between an upper structure and a lower structure or the ground, and is used for seismically supporting the upper structure. It may be arranged on the structure side, or alternatively, it may be arranged on the lower structure side or the ground side. When arranging the interposition body on the upper structure side, the lower part of the upper structure itself may be implemented as an interposition body, while on the other hand, when arranging the interposition body on the lower structure side or the ground side, The concrete foundation itself on the upper side of the lower structure or on the ground side may be used as an interposer.

Since this seismic isolation bearing device is of a sliding type, it is difficult to completely return the upper structure to the origin (initial installation position) only by the origin return ability of the device itself, and thus lead A return-to-origin type laminated rubber bearing device or a horizontal spring device, which is made of a laminated rubber body using a filled or highly damped rubber, may be used in parallel with the seismic isolation bearing device.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention and embodiments of the present invention will be described in more detail with reference to the preferred embodiments shown in the drawings. The present invention is not limited to these examples.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a seismic isolation bearing device 1 of the present embodiment has a laminated rubber body 4 in which reinforcing layers 2 and rubber layers 3 are alternately laminated.
And the sliding member 6 attached to the upper end surface 5 of the laminated rubber body 4.
An intervening body 7 slidably contacting the sliding member 6 in the horizontal direction, and a mounting plate 9 mounted on the lower end surface 8 of the laminated rubber body 4.

The reinforcing layer 2 is composed of a plurality of thin reinforcing steel plates 21.
And the thick reinforcing steel plate 24 embedded in the upper end surface 22 of the rubber layer 3, the rubber layer 3 made of natural rubber or the like is formed so as to cover the outer peripheral edge of the reinforcing layer 2 and the rubber layer 3. The reinforcing layer 2 is adhered to each other by vulcanization adhesion or the like. The rubber layer 3 may be formed using a high damping rubber.

The sliding member 6 is partially embedded in the thick reinforcing plate 24 so as not to be displaced in the horizontal direction, so that the laminated rubber body 4 is formed.
Is attached to the upper end surface 5 of the. The sliding member 6 of this example is
It is composed of a plate-shaped member mainly composed of polytetrafluoroethylene resin, but instead of this, a low-friction layer is formed on the entire surface of the steel plate and the side of the steel plate that slidably contacts a low-friction layer 33 described later. 33, which is equivalent to the forming material of 33 and includes a sliding layer formed in the same manner.

The interposer 7 includes an interposer body 31 made of steel and an incompressible low friction layer 33 integrally formed on the entire one surface 32 of the interposer body 31. Interposer 7
Are in slidable contact with the sliding member 6 via the low friction layer 33. The low-friction layer 33 is provided on the one surface 3 of the interposer body 31.
2 is formed by melting and baking polytetrafluoroethylene resin powder or adhering a polytetrafluoroethylene resin thin film with an adhesive or the like.

In this example, the sliding member 6 and the intervening member 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 member 6 by 10 cm or more in all horizontal directions. As a result, the relative sliding amount of the sliding member 6 with respect to the intervening member 7 through the low friction layer 33 in the relative sliding (relative sliding displacement) of the sliding member 6 with respect to the interposing member 7 in all horizontal directions (relative sliding displacement is possible). The distance) is 10 cm or more. It is not necessary to form the low-friction layer 33 on the entire surface 32 of the intermediate body 31, and when the relative slidable amount is 10 cm or more, the low-friction layer 33 is formed only in that region. May be.

The mounting plate 9 formed of a steel plate or the like has a plate-shaped base portion 41 and a reinforcing portion 42 formed integrally with the plate-shaped base portion 41. The reinforcing portion 42 is provided under the rubber layer 3. The mounting plate 9 is embedded in the end surface 23 so that the mounting plate 9 does not slide in the horizontal direction with respect to the lower end surface 8 of the laminated rubber body 4.

The seismic isolation bearing device 1 described above is arranged, for example, between the upper structure 51 and the ground foundation 52, and the upper structure 5 is installed.
An interposer 7 is fixed to 1 by bolts and the like, and a mounting plate 9 is fixed to the foundation 52 by anchor bolts and the like, and the upper structure 51 is seismically isolated and used. In the case of a small earthquake (vibration with small vibration acceleration), the inclusion body 7
Between the sliding member 6 and the sliding member 6, relative sliding displacement in the horizontal direction does not occur due to the frictional force therebetween, the laminated rubber body 4 is sheared and deformed in the horizontal direction, and the vibration energy due to the small earthquake is attenuated by this shearing and deformation. Therefore, the transmission of vibration to the upper structure 51 is reduced. At the time of a comparatively large earthquake (vibration with a large vibration acceleration), the sliding member 6 slides and displaces horizontally with respect to the interposer 7, and the vibration due to this large earthquake is not transmitted to the upper structure 51, while the sliding displacement is large. The vibration energy is damped by the frictional heat in the above and the horizontal shearing deformation of the laminated rubber body 4, whereby the upper structure 51 is effectively protected from this vibration.

By the way, in the seismic isolation bearing device 1, the sliding member 6
Is in contact with the intervening body 7 via the low friction layer 33, so that the intervening body 7 is likely to slide and displace in the horizontal direction. A horizontal relative sliding displacement can be generated between them, and the upper structure 51 can be effectively protected from the vibration of this small-scale earthquake. Further, since the one surface 32 of the steel interposer body 31 is covered with the low friction layer 33, even if the interposer body 31 itself is rusted or the like during long-term use, there is no effect, and the initial stage is not affected. The seismic isolation effect of can be maintained for a long time.

In the seismic isolation bearing 1, the upper structure 51 is returned to the initial setting position (origin position) after a relative horizontal sliding displacement occurs between the interposer 7 and the sliding member 6. Function is not enough. In order to compensate for this, as shown in FIG. 2, the spring device 1 that generates a spring force in the horizontal direction between the upper structure 51 and the foundation 52 is installed in the seismic isolation bearing device 1.
3 may be placed side by side, and as shown in FIG. 3, the origin return type laminated rubber bearing device 62 may be placed side by side. 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 attachment 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 foundation 52 with anchor bolts or the like. In this case, the rubber layer of the laminated rubber body 65 may be formed by using a high damping rubber.
Lead-containing laminated rubber body 6 by penetrating in the stacking direction and enclosing lead
It may be 5.

[0022]

As described above, according to the present invention, it is possible to reduce the frictional resistance on the sliding contact surface, to secure an easy sliding displacement on the sliding contact surface, and to prevent a medium-scale earthquake. In addition to this, of course, it is possible to reduce the transmission thereof to the upper structure even with respect to vibration due to a small-scale earthquake or the like, and to achieve reliable protection of the upper structure.

[Brief description of 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.

FIG. 3 is an explanatory diagram of still another usage example of the example of FIG. 1.

[Explanation of symbols]

 1 Seismic Isolation Bearing Device 2 Reinforcement Layer 3 Rubber Layer 4 Laminated Rubber Body 6 Sliding Material 31 Interposer Body 33 Low Friction Layer

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F16F 15/04 8312-3J F16F 15/04 B

Claims (6)

[Claims] 1. A laminated rubber body in which reinforcing layers and rubber layers are alternately laminated, a sliding member attached to one end surface of the laminated rubber body, and slidably abutting on the sliding member. The intermediate body includes an intermediate body and a low friction layer integrally formed on one surface of the intermediate body. The intermediate is a low friction layer. A seismic isolation bearing that slidably abuts on the sliding member via. 2. The low friction layer is provided on one surface of the main body of the interposer so that the relative slidable amount through the low friction layer in the relative sliding of the sliding member with respect to the interposition in all horizontal directions is 10 cm or more. The seismic isolation bearing device according to claim 1, which is formed. 3. The seismic isolation bearing device according to claim 1, wherein the low friction layer is made of polytetrafluoroethylene resin. 4. The reinforcing layer comprises a thin reinforcing plate and a thick reinforcing plate disposed on at least one of the upper surface and the lower surface of the laminated rubber body, and the sliding member is a thick reinforcing plate. The seismic isolation bearing device according to any one of claims 1 to 3, which is partially embedded and attached to one end surface of the laminated rubber body. 5. A seismic isolation bearing device, which is arranged between an upper structure and a lower structure or the ground, and is used for seismically supporting the upper structure, wherein the interposition body is the upper structure. Side or substructure side or ground side is arranged.
The seismic isolation support device described in any one of 1. 6. The horizontal spring device or the return-to-origin type laminated rubber bearing device arranged between the upper structure and the lower structure or the ground, and used in parallel with any one of claims 1 to 5. Seismic isolation support device described.