JPH11148534A - Slip type base isolation support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide effective vibration dawping for small to large earthquakes by providing a laminated rubber body where a reinforcement layer and a rubber layer are alternately laminated, a slip member on one end face, a support plate fixed to upper and lower structures opposite to each other and the ground, and a perpendicular column in the laminated rubber. SOLUTION: This base isolation support device 1 is provided with a laminated rubber boby 4 where a reinforcement layer 2 such as a steel sheet and a rubber layer 3 such as naural rubber, a slip member 6 fitted to its upper end face 5, a support plate 63 fixed a lower surface of an upper structure 61 opposite thereto, and a perpendicular column 7 fitted in the laminated rubber body 4. The device 1 is arranged between the upper structure 61 and a foundation 62 of the ground, the slip member 6 is brought into slidable contact with a lower side of the support plate 63 fixed to the upper structure 61, a flange body 15 is fixed to the foundation 62, and the upper structure 61 is supported on the base-isolated manner. When the shear deformation in the horizontal direction is generated in the laminated rubber body 4 by an earthquake, the lead column 7 is shear-deformed to absorb the vibration energy, and the upper structure can be effectively protected from the vibration of a small-to- intermediate to large earthquake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing 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 vibrations due to an earthquake or the like. Related to a seismic isolation bearing device.

[0002]

SUMMARY OF THE INVENTION A sliding-type seismic isolation bearing device having a laminated rubber body in which reinforcing layers and rubber layers are alternately laminated is disclosed. It is used to support the upper structure and to reduce the transmission of vibration such as an earthquake to the upper structure and to attenuate the vibration of the upper structure. As such a seismic isolation bearing device, an origin return type device in which the upper end surface and the lower end surface are fixed to the upper structure and the lower structure or the ground, respectively, and one of the upper end surface and the lower end surface are used. A sliding type fixed to one of the upper structure and the lower structure or the ground, and the other being slidably displaceable with respect to the other of the upper structure and the lower structure or the ground. There is.

[0003] A sliding type seismic isolation bearing device slidably abuts one end side of a laminated rubber body with a mating material, and elastically deforms the laminated rubber body itself and the laminated rubber body on the slidable contact surface. The upper structure is protected from vibrations such as earthquakes by the relative sliding displacement in the horizontal direction with the counterpart material. Conventionally, sliding-type seismic isolation bearings have been used for small- and medium-scale earthquakes to shear the laminated rubber body in the horizontal direction, reduce the seismic force by this shearing deformation, and transmit vibration to the upper structure. In the case of a large-scale earthquake, the sliding displacement occurs in the horizontal direction on the slidable contact surface, so that the vibration caused by this large-scale earthquake is not transmitted to the structure, and the vibration energy is attenuated by the frictional heat generated by the sliding displacement This effectively protects the superstructure from vibration.

[0004] In such a sliding type seismic isolation bearing device, not only small- and medium-scale earthquakes, but also relatively large-scale earthquake vibrations, when the vibrations are less than the frictional resistance at the slidable contact surface, the laminated rubber is used. Since only the body is subjected to shear deformation, sufficient damping of vibration energy cannot be obtained, and the damping of vibration energy as a whole depends substantially only on frictional heat in sliding displacement. The effect of reducing vibration is extremely small.

Further, since the laminated rubber body has relatively small horizontal rigidity and behaves like an elastic body, the laminated rubber body is also sheared and deformed by a relatively small external force such as wind. There is a possibility that vibration is easily caused by an external force such as wind.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and its object is not only in the case of vibration caused by a large-scale earthquake or the like but also in the case of vibration caused by a small-scale earthquake or the like. Can absorb the seismic vibration energy even from vibrations to the extent that no vibration occurs, and thus can provide effective vibration damping for vibrations caused by earthquakes from small to large scales. It is an object of the present invention to provide a sliding type seismic isolation bearing device that can prevent the upper structure from vibrating due to a relatively small external force such as the above.

[0007]

According to the present invention, there is provided a sliding type seismic isolation bearing device which is arranged between an upper structure and a lower structure or a ground and which supports the upper structure in a seismic manner. A laminated rubber body in which layers are alternately laminated, a sliding member attached to one end surface of the laminated rubber body, and an upper structure or a lower structure facing the sliding member, or a surface of a ground. A bearing plate, and at least one lead column mounted in the laminated rubber body, a sliding member slidably contacting the bearing plate at one end, and a lower structure at the other end. Alternatively, it is fixed to the ground or a superstructure.

[0008] The sliding member may be constituted by a plate body mainly composed of polytetrafluoroethylene resin and optionally mixed with reinforcing fibers or reinforcing materials such as glass fibers.
Instead, a steel plate and a polytetrafluoroethylene resin powder or the like are uniformly distributed on one side of the steel plate, and are melted and baked or a polytetrafluoroethylene resin thin film (film or sheet) is formed on the steel plate. It may have a sliding layer formed on one surface by bonding with an adhesive or the like. The slip layer is preferably formed on a steel plate or the like so that its thickness is about several hundred microns to several millimeters in order to prevent a large cold flow or the like due to a supporting load. Not limited.

[0009] The laminated rubber body of the present invention may comprise a laminated body in which reinforcing layers and rubber layers are alternately laminated, and a mounting member fixed to one end surface of the laminated body. is there. In this case, the sliding member may be provided in a recess formed on one end surface of the mounting member. Further, in the present invention, a reinforcing layer may be constituted by including a thin reinforcing plate and a thick reinforcing plate disposed on at least one of the upper surface and the lower surface of the laminate, and the thick reinforcing plate may be formed of a laminate. In the case of disposing it on both the upper surface and the lower surface, each end of the lead support is preferably disposed on a thick reinforcing plate, and the lead support is preferably mounted in the laminated rubber body. The reinforcing layer is usually made of a steel plate or a hard synthetic resin plate, but is preferably made of a steel plate. Only one lead strut may be mounted on the laminated rubber body. Alternatively, a plurality of lead struts may be mounted on the laminated rubber body, preferably mounted axially symmetrically.

The present seismic isolation bearing device is disposed between an upper structure and a lower structure or the ground, and is used to seismically support 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. In a preferred example, the bearing member is configured such that the relative slidable amount of the sliding member with respect to the bearing member in the entire horizontal direction is 10 cm or more. As the bearing receiving plate, a plate such as a stainless steel plate or a chrome-plated steel plate which does not rust over a long period of time and whose contact surface with the sliding member is always kept flat is used.

Since the seismic isolation bearing device is of a sliding type, it is difficult to completely return the superstructure to the origin (initial installation position) only by the origin return capability of the device itself. A return-to-origin type laminated rubber bearing device or a horizontal spring device made of a laminated rubber body or the like using struts or using high-damping rubber may be used together 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 embodiments.

[0013]

In FIG. 1, a seismic isolation bearing device 1 of this embodiment comprises a laminated rubber body 4 formed by alternately laminating a reinforcing layer 2 made of a steel plate or the like and a rubber layer 3 made of a natural rubber or the like; A sliding member 6 attached to the upper end surface 5 of the body 4 and a bearing plate 6 fixed to the lower surface of the upper structure 61 facing the sliding member 6
3 and a lead column 7 mounted in the laminated rubber body 4.

The laminated rubber body 4 includes a cylindrical laminated body 11 in which the reinforcing layers 2 and the rubber layers 3 are alternately laminated, and a laminated body 1.
The laminated body 11 includes a disk-shaped or square-shaped mounting member 13 fixed to one end surface 12 of the first member 1 and a disk-shaped or square-shaped flange member 15 fixed to the other end surface 14 of the laminated body 11.

The reinforcing layer 2 includes a plurality of thin reinforcing steel plates 21.
And thick reinforcing steel plates 24 and 25 arranged on the upper end surface 22 and the lower end surface 23 of the rubber layer 3. The rubber layer 3 is formed so as to cover the outer peripheral edge of the reinforcing layer 2. 3 and the reinforcing layer 2 are bonded to each other by vulcanization bonding or the like.

The mounting member 13 is fixed to a thick reinforcing steel plate 24 by bolts or the like, and is fixed to one end surface 12 of the laminated body 11. Has a recess 31 formed therein. Collar 15
Is fixed to a thick reinforcing steel plate 25 by bolts or the like, and is fixed to the other end surface 14 of the laminate 11.

The sliding member 6 is partially disposed in the recess 31 on the upper surface of the mounting member 13 so as not to be displaced in the horizontal direction.
It is attached to the upper end surface 5 of the laminated rubber body 4. The sliding member 6 of this example is a plate-shaped member mainly composed of polytetrafluoroethylene resin.

The lead support 7 has a columnar shape, and its upper end 35 is formed in a stepped through hole 36 of the thick reinforcing plate 24 and its lower end 37 is formed in a stepped through hole 38 of the thick reinforcing plate 25. It is arranged and mounted in the laminated rubber body 4.

The mounting member 13 faces the stepped through hole 36.
The recess 41 has a flange body 15 facing the stepped through hole 38.
The key member 51 is formed over the through hole 36 and the recess 41, and the key member 51 is formed over the through hole 38 and the recess 42.
And the key members 52 are fitted respectively. The key member 51 prevents the mounting member 13 from sliding in the horizontal direction with respect to the laminated body 11, and the key member 52 prevents the flange body 15 from sliding in the horizontal direction relative to the laminated body 11. The lead posts 7 are densely mounted in a space formed by the key members 51 and 52 and the laminate 11 so that no gap is generated.

The above-described seismic isolation bearing device 1 is disposed, for example, between an upper structure 61 and a foundation 62 of the ground.
1 on the lower surface of the bearing receiving plate 63 fixed by bolts or the like,
The sliding member 6 is slidably brought into contact with the
Is fixed by anchor bolts or the like, and used to support the upper structure 61 in a seismic isolation manner.

In the seismic isolation bearing device 1, the sliding member 6 is slidably contacted with the lower surface of the bearing receiving plate 63 in the horizontal direction so as to be easily slid and displaced in the horizontal direction with respect to the upper structure 61. Since the lead strut 7 is mounted in the laminated rubber body 4, even when a large-scale earthquake occurs, even when a large-scale earthquake occurs, when the horizontal shear deformation occurs in the laminated rubber body 4, lead is always applied. As a result of the column 7 being sheared, the vibration energy absorption effect of the lead column 7 can be obtained. Thus, in addition to the effect of suppressing vibration transmission due to the relative sliding displacement and the shearing deformation of the laminated rubber body 4, the lead column 7 can be obtained. By virtue of the vibration energy absorption effect of the shear deformation and the relative sliding displacement of 7, the upper structure 61 can be effectively protected from vibrations of small to medium scale earthquakes. Furthermore, in the seismic isolation bearing device 1, since the horizontal rigidity of the laminated rubber body 4 is appropriately increased, the laminated rubber body 4 is not easily sheared and deformed by a relatively small external force such as wind. The object is not vibrated by an external force such as wind.

In the seismic isolation bearing device 1, the bearing receiving plate 63
The function of returning the upper structure 61 to the initial set position (origin position) after the horizontal relative sliding displacement occurs between the sliding member 6 and the sliding member 6 is not sufficient. So, to make up for this,
As shown in FIG. 2, a spring device 71 that generates a spring force in a horizontal direction between the upper structure 61 and the foundation 62 may be juxtaposed with the seismic isolation bearing device 1, and furthermore, as shown in FIG. 3. Alternatively, an origin return type laminated rubber bearing device 72 may be provided. The return-to-origin type laminated rubber bearing device 72 shown in FIG.
An upper flange body 74 (corresponding to the mounting member 13 of the laminated rubber body 4) similar to that of the laminated rubber body 73 is bolted to the upper structure 61
In addition, a lower flange body 75 (corresponding to the flange body 15 of the laminated rubber body 4) is used by being fixed to the foundation 62 with an anchor bolt or the like. In this case, the rubber layer of the laminated rubber body 73 may be formed using high-damping rubber.

[0023]

According to the present invention, it is possible to absorb seismic vibration energy not only in vibrations caused by large-scale earthquakes but also in vibrations caused by small- and medium-scale earthquakes, etc. Therefore, it is possible to obtain effective vibration damping against vibrations caused by earthquakes from a small scale to a large scale, and not to vibrate the upper structure by relatively small external force such as wind. Can be

[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 use 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 member 7 Lead support

Continued on the front page (72) Inventor Shozo Shiranashihama 2-3-5 Misakicho, Chiyoda-ku, Tokyo Iron Construction Corporation (72) Inventor Masayoshi Ikenaga 8-8 Kirihara-cho, Fujisawa-shi, Kanagawa OILES INDUSTRIAL CO., LTD. Fujisawa Plant (72) Inventor Shinichi Sakuraba 8 Kirihara-cho, Fujisawa-shi, Kanagawa Prefecture Oiles Corporation Fujisawa Plant

Claims (4)

[Claims] 1. A sliding type seismic isolation bearing device disposed between an upper structure and a lower structure or a ground for seismically isolating and supporting the upper structure, wherein a reinforcing layer and a rubber layer are alternately provided. A laminated rubber body formed by laminating, a sliding member attached to one end surface of the laminated rubber body, a bearing plate fixed to a surface of an upper structure or a lower structure facing the sliding member or a ground, At least one lead strut mounted in the laminated rubber body, the sliding member slidably contacts the bearing support plate at one end, and the lower structure or the ground or the upper structure at the other end. Sliding seismic isolation bearing device fixed to objects. 2. The sliding-type seismic isolation bearing according to claim 1, wherein the sliding member is mainly formed of polytetrafluoroethylene resin. 3. The laminated rubber body includes a laminated body in which reinforcing layers and rubber layers are alternately laminated, and a mounting member fixed to one end surface of the laminated body. The sliding type seismic isolation bearing device according to claim 1, wherein the sliding type seismic isolation bearing device is disposed in a recess formed on one end surface of the mounting member. 4. The sliding device according to claim 1, wherein the sliding device is used together with a horizontal spring device or a return-to-origin type laminated rubber bearing device disposed between the upper structure and the lower structure or the ground. Type seismic isolation bearing device.