JP4000643B2 - Sliding 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]
A sliding-type seismic isolation device having a laminated rubber body in which reinforcing layers and rubber layers are alternately laminated is arranged between an upper structure and a lower structure or the ground to dispose the upper structure. It is used to support and reduce the transmission of vibrations such as earthquakes to the superstructure, and to attenuate the vibrations of the superstructure. 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 bearing device slidably contacts one end surface side of the laminated rubber body and the mating material, elastic deformation of the laminated rubber body itself, and the laminated rubber body and mating material on the slidable abutting surface And the relative sliding displacement in the horizontal direction of each other, the upper structure is protected from vibration such as an earthquake. Conventionally, in the case of small and medium-sized earthquakes, the sliding-type seismic isolation device causes the laminated rubber body to undergo shear deformation in the horizontal direction, reducing the seismic force by this shear deformation, and transmitting vibration to the superstructure. In a large-scale earthquake, the sliding contact surface is slid in the horizontal direction, and the vibration caused by this large-scale earthquake is not transmitted to the structure, and the vibration energy is attenuated by frictional heat in the sliding displacement. This effectively protects the superstructure from vibrations.
[0004]
In such a sliding-type seismic isolation device, not only small-scale earthquakes, but also relatively large-scale earthquake vibrations, vibrations below the frictional resistance force on the slidable contact surface can be used only for laminated rubber bodies. Due to the shear deformation, the vibration energy cannot be sufficiently attenuated, and the overall vibration energy attenuation substantially depends only on the frictional heat in the sliding displacement, resulting in reduced seismic vibration to the superstructure. The effect is extremely small.
[0005]
Furthermore, since the laminated rubber body has a relatively small horizontal rigidity and behaves like an elastic body, it is sheared by a relatively small external force such as wind. There is a risk of being easily vibrated by an external force.
[0006]
The present invention has been made in view of the above-mentioned points, and the object of the present invention is not to cause slippage not only in vibrations caused by large-scale earthquakes, but also in vibrations caused by small and medium-scale earthquakes. It can absorb seismic vibration energy even from a certain degree of vibration, and thus it can obtain effective vibration attenuation against vibrations caused by earthquakes from small to large scales, and also compare wind etc. It is an object of the present invention to provide a sliding type seismic isolation bearing device that can prevent the superstructure from vibrating by a small external force.
[0007]
[Means for Solving the Problems]
The sliding-type seismic isolation device arranged between the upper structure and the lower structure or the ground according to the present invention and supporting the upper structure in isolation is formed by alternately laminating reinforcing layers and rubber layers. A laminated rubber body, a sliding member attached to one end surface of the laminated rubber body, an upper structure or a lower structure facing the sliding member or a support plate fixed to the surface of the ground, and a laminated rubber body At least one lead strut mounted on one end, the sliding member slidably contacts the support plate on one end side, and fixed to the lower structure or the ground or upper structure on the other end side. The
[0008]
The sliding member is mainly composed of polytetrafluoroethylene resin, and may be constituted by a plate body in which reinforcing fibers or reinforcing materials such as glass fibers are mixed in some cases, but instead of this, a steel plate and the steel plate A polytetrafluoroethylene resin powder or the like is uniformly distributed on one surface, and this is melt-baked or a polytetrafluoroethylene resin thin film (film or sheet) is adhered to one surface of a steel plate with an adhesive or the like. It may be provided with a formed sliding layer. The sliding layer is preferably formed on a steel plate or the like so that its thickness becomes a value of about several hundred microns to several millimeters so that a large cold flow or the like does not occur due to a load to be supported. It is not limited.
[0009]
The laminated rubber body of the present invention may include a laminated body in which reinforcing layers and rubber layers are alternately laminated, and an attachment member fixed to one end surface of the laminated body. In this case, the sliding member may be disposed in a recess formed on one end surface of the mounting member. In the present invention, the reinforcing layer may be configured 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 laminated body. When arranging the lead struts on both the upper surface and the lower surface, the end portions of the lead struts may be disposed on a thick reinforcing plate, and the lead struts may be mounted in the laminated rubber body. The reinforcing layer is usually composed of a steel plate or a hard synthetic resin plate, but is preferably composed of a steel plate. Only one lead strut may be attached to the laminated rubber body, but instead, a plurality of lead struts may be attached to the laminated rubber body, preferably axisymmetrically attached.
[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 with seismic isolation. Alternatively, it may be arranged on the lower structure side or the ground side instead. In a preferred example, the support receiving plate is such that the relative slidable amount of the sliding member with respect to the support receiving plate in all horizontal directions is 10 cm or more. As the support plate, a plate such as a stainless steel plate or a chrome-plated steel plate that does not rust even for a long time and whose contact surface with the sliding member is always kept flat is used.
[0011]
Since the seismic isolation 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 a high 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 made of steel plates and rubber layers 3 made of natural rubber or the like are alternately laminated, and the laminated rubber body 4. A sliding member 6 attached to the end surface 5, a support receiving plate 63 fixed to the lower surface of the upper structure 61 facing the sliding member 6, and a lead column 7 mounted in the laminated rubber body 4. Yes.
[0014]
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 disk-shaped or rectangular mounting member 13 fixed to one end surface 12 of the laminated body 11. And a disk-shaped or square-shaped casing 15 fixed to the other end face 14 of the laminated body 11.
[0015]
The reinforcing layer 2 includes a plurality of thin reinforcing steel plates 21 and thick reinforcing steel plates 24 and 25 disposed on the upper end surface 22 and the lower end surface 23 of the rubber layer 3, and the rubber layer 3 is formed outside the reinforcing layer 2. The rubber layer 3 and the reinforcing layer 2 are bonded to each other by vulcanization bonding or the like.
[0016]
The mounting member 13 is fixed to the thick reinforcing steel plate 24 with bolts or the like, and is fixed to the one end surface 12 of the laminated body 11. The upper surface of the mounting member 13, which is also the upper end surface 5 of the laminated rubber body 4, is recessed. A location 31 is formed. The casing 15 is fixed to the thick reinforcing steel plate 25 with bolts or the like, and is fixed to the other end surface 14 of the laminate 11.
[0017]
The sliding member 6 is attached to the upper end surface 5 of the laminated rubber body 4 with a part disposed in the recess 31 on the upper surface of the mounting member 13 so as not to be displaced in the horizontal direction. The sliding member 6 of this example is made of a plate-like member mainly composed of polytetrafluoroethylene resin.
[0018]
The lead strut 7 is cylindrical, and its upper end 35 is arranged in the stepped through hole 36 of the thick reinforcing plate 24 and its lower end 37 is arranged in the stepped through hole 38 of the thick reinforcing plate 25. The laminated rubber body 4 is mounted.
[0019]
A recess 41 is formed in the mounting member 13 so as to face the stepped through hole 36, and a recess 42 is formed in the housing 15 so as to face the stepped through hole 38. A key member 51 and a key member 52 are fitted over the through hole 38 and the recess 42, respectively. The key member 51 prevents the mounting member 13 from slipping in the horizontal direction with respect to the stacked body 11, and the key member 52 prevents the housing 15 from sliding in the horizontal direction with respect to the stacked body 11. The lead struts 7 are closely mounted in a space formed by the key members 51 and 52 and the laminated body 11 so that no gap is generated.
[0020]
The above seismic isolation bearing device 1 is arranged between the upper structure 61 and the foundation 62 of the ground, for example, and slides the sliding member 6 on the lower surface of the bearing receiving plate 63 fixed to the upper structure 61 with bolts or the like. It is used in such a manner that the upper structure 61 is seismically supported by making it contact freely and fixing the housing 15 to the foundation 62 with anchor bolts or the like.
[0021]
In the seismic isolation bearing device 1, the sliding member 6 is brought into contact with the lower surface of the bearing receiving plate 63 so as to be slidable in the horizontal direction, and is easily slid and displaced in the horizontal direction with respect to the upper structure 61. 4, since the lead strut 7 is mounted, the lead strut 7 is always attached to the laminated rubber body 4 when a horizontal shear deformation occurs in a large-scale earthquake as well as in a small-scale earthquake. As a result of the shear deformation, the vibration energy absorption effect of the lead strut 7 can be obtained. Thus, in addition to the effect of suppressing vibration transmission due to the relative slip displacement and the shear deformation of the laminated rubber body 4, the shear of the lead strut 7 can be obtained. By virtue of the vibration energy absorption effect due to deformation and relative slip displacement, the upper structure 61 can be effectively protected from earthquake vibrations from medium to small scale. Further, 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.
[0022]
Note that the seismic isolation bearing device 1 has a function of returning the upper structure 61 to the initial setting position (origin position) after a horizontal relative sliding displacement occurs between the bearing receiving plate 63 and the sliding member 6. not enough. Therefore, in order to compensate for this, as shown in FIG. 2, a spring device 71 that generates a spring force in the horizontal direction between the upper structure 61 and the foundation 62 may be juxtaposed with the seismic isolation bearing device 1. As shown in FIG. 3, an origin return type laminated rubber bearing device 72 may be juxtaposed. An origin return type laminated rubber bearing device 72 shown in FIG. 3 has an upper structure 61 in which an upper casing 74 (corresponding to the mounting member 13 of the laminated rubber body 4) of the laminated rubber body 73 is the same as that of the laminated rubber body 4. In addition, the lower casing 75 (corresponding to the casing 15 of the laminated rubber body 4) is used by being fixed to the foundation 62 with anchor bolts or the like. In this case, the rubber layer of the laminated rubber body 73 may be formed using high damping rubber.
[0023]
【The invention's effect】
According to the present invention, earthquake vibration energy can be absorbed not only in vibration caused by large-scale earthquakes, but also in vibrations caused by small and medium-scale earthquakes, etc. Thus, it is possible to obtain effective vibration damping against vibrations caused by earthquakes from small to large scales, and it is possible to prevent the superstructure from vibrating due to relatively small external forces such as wind. .
[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]
1 Seismic isolation bearing device 2 Reinforcing layer 3 Rubber layer 4 Laminated rubber body 6 Sliding member 7 Lead strut

Claims (3)

A sliding-type seismic isolation device that is arranged between the upper structure and the lower structure or the ground, and supports the upper structure in a seismic isolation manner, in which the reinforcing layers and the rubber layers are alternately stacked. A rubber body, a sliding member attached to one end surface of the laminated rubber body, a support receiving plate fixed to the surface of the upper structure or the lower structure or the ground facing the sliding member, and mounted in the laminated rubber body At least one lead strut, the sliding member slidably contacts the support plate on one end side, and is fixed to the lower structure or the ground or the upper structure on the other end side. This is a sliding-type seismic isolation device , and the laminated rubber body includes a laminated body in which reinforcing layers and rubber layers are alternately laminated, and an attachment member fixed to one end surface of the laminated body. The sliding member disposed in the recess formed on the one end surface of the mounting member is It is made of a polytetrafluoroethylene resin and is composed of a plate body in which a reinforcing fiber such as glass fiber or a reinforcing material is mixed in the polytetrafluoroethylene resin, and supports the sliding member in a slidable manner. The receiving plate is a sliding-type seismic isolation device made of a stainless steel plate or a chrome-plated steel plate . A sliding-type seismic isolation device that is arranged between the upper structure and the lower structure or the ground, and supports the upper structure in a seismic isolation manner, in which the reinforcing layers and the rubber layers are alternately stacked. A rubber body, a sliding member attached to one end surface of the laminated rubber body, a support receiving plate fixed to the surface of the upper structure or the lower structure or the ground facing the sliding member, and mounted in the laminated rubber body At least one lead strut, the sliding member slidably contacts the support plate on one end side, and is fixed to the lower structure or the ground or the upper structure on the other end side. This is a sliding-type seismic isolation device, and the laminated rubber body includes a laminated body in which reinforcing layers and rubber layers are alternately laminated, and an attachment member fixed to one end surface of the laminated body. The sliding member disposed in the recess formed on one end surface of the mounting member is made of steel. The polytetrafluoroethylene resin powder is uniformly disposed on one surface of the steel plate, and this is melt-baked or formed by adhering a polytetrafluoroethylene resin thin film to one surface of the steel plate with an adhesive. And a sliding receiving member that is slidably in contact with the sliding layer of the sliding member and is made of a stainless steel plate or a chrome-plated steel plate . The sliding type seismic isolation bearing device according to claim 1 or 2 , which 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 .

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