JPH11173379A - Seismic isolation device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The contact between a sliding plate and a sliding material can be exerted by one seismic isolation device, so that the function of an elastic bearing and a sliding bearing can be exhibited, and a member such as a dustproof cover is not required. The surfaces can be protected to ensure reliable sliding between them,
Therefore, a seismic isolation device that can always exhibit high seismic isolation performance is provided. SOLUTION: A pair of mounting substrates 22 which are mounted on an upper structure 20 and a lower structure 21 so as to face each other, and a slide plate 23 provided on one of the mounting substrates 22.
And a sliding member 24 provided on the other mounting substrate 23 and slidably abutting on the sliding plate 23, and provided so as to surround these sliding plates 23 and the sliding member 24, and both ends are provided. It is composed of a laminated rubber 25 connected to each of the mounting substrates 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seismic isolation device interposed between an upper structure and a lower structure in various seismic isolation structures.

[0002]

2. Description of the Related Art In recent years, in order to make various structures seismic isolation structures, seismic isolation devices are interposed in the foundations and middle floors of the structures, so that the structure can be propagated from the ground to the structures due to an earthquake or the like. Construction methods have been developed to attenuate the vibrations that are to be attempted and to reduce the stress and deformation that occur in the frame of the structure. 7 to 11 show a building 1 as an upper structure,
This shows a conventional seismic isolation structure in which a seismic isolation device is interposed between a concrete foundation 2 as a lower structure and the above-mentioned building 1 as a base seismic isolation structure. In this seismic isolation structure, as shown in FIG. 7, two types of seismic isolation devices, a laminated rubber bearing 5 and an elastic sliding bearing 10, are interposed.

Here, as shown in FIG. 8, a laminated rubber bearing 5 is composed of a pair of mounting substrates 3 integrally mounted on the upper surface of the concrete foundation 2 and the lower surface of the building 1, respectively.
And a laminated rubber 4 which is integrally mounted between the mounting substrates 3 and elastically deformed by relative movement of the mounting substrates 3 in the surface direction. On the other hand,
As shown in FIG. 9, the elastic slide bearing 10 includes a slide plate 6 mounted on a concrete foundation 2 and a columnar body 7 fixed to the lower surface of the building 1 and arranged to face the slide plate 6.
And a laminated rubber 8 integrally attached to the lower end surface of the columnar body 7, and a sliding member 9 integrally attached to the lower end surface of the laminated rubber 8 and slidably contacting the sliding plate 6. It is composed of As shown in FIG. 7, a plurality of the laminated rubber bearings 5 and the elastic sliding bearings 10 are provided between the building 1 and the concrete foundation 2 at predetermined intervals in the horizontal direction.

For example, when a small- or medium-scale earthquake occurs, as shown in FIG. 10, the laminated rubber 8 of the elastic slide bearing 10 and the laminated rubber 4 of the laminated rubber bearing 5 are used.
Is elastically deformed in the shearing direction to reduce the horizontal seismic force transmitted to the building 1, and
The period of the shaking of the building is increased, and the soundness of the building 1 is secured. Further, when a large-scale earthquake that causes deformation of the laminated rubber 4 of the elastic slide bearing 10 beyond the allowable range of the elastic deformation occurs, as shown in FIG. When the amount of deformation reaches the allowable amount E, the sliding member 9 slides on the sliding plate 6 (the sliding amount at this time is indicated by reference numeral D in FIG. 11), and the horizontal member acting on the building 1 is moved. The horizontal seismic force is reduced by converting the seismic force into thermal energy by a frictional force generated when the sliding member 9 slides on the sliding plate 6 and releasing the thermal energy into the air, thereby reducing the soundness of the building 1. Is to be secured.

[0005]

In the seismic isolation device described above, in order to efficiently reduce the horizontal seismic force acting on the building 1 at the time of a large-scale earthquake, the horizontal seismic force must be slipped. It is necessary to efficiently convert the thermal energy generated at the time of sliding between the member 9 and the sliding plate 6 for this purpose. For this purpose, the sliding member 9 and the sliding plate 6 are surely slid under a predetermined frictional force. Must be moved. However,
As shown in FIG. 9, when the sliding plate 6 is exposed to the outside air, dust easily adheres to the sliding plate 6, or rust is generated due to the adhesion of moisture, and the dust or rust is generated. It is assumed that the sliding of the sliding member 9 is hindered by the above.

Conventionally, in order to avoid such a problem, a cover 11 that covers the sliding member 9 is attached to the elastic sliding bearing 10 as shown by a chain line in FIG. Since a treatment for maintaining the airtight state is required, there has been a problem that the cost of construction increases due to an increase in the number of components and a complicated construction process. Also,
In the above conventional seismic isolation structure, it is necessary to arrange two types of seismic isolation devices at appropriate positions, and there has been a problem that seismic isolation design and construction are complicated.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problem of the seismic isolation device interposed in the above-described conventional seismic isolation structure. Function can be exhibited, and the contact surface between the sliding plate and the sliding material can be protected without the need for a member such as a dust-proof cover, and secure sliding of both can be ensured. It is an object of the present invention to provide a seismic isolation device capable of exhibiting seismic performance.

[0008]

According to a first aspect of the present invention, there is provided a seismic isolation device according to the present invention, wherein a pair of mounting substrates are mounted on an upper structure and a lower structure in a facing state, and provided on one of the mounting substrates. The sliding plate provided, a sliding member provided on the other mounting substrate side and slidably contacting the sliding plate, and provided so as to surround these sliding plates and the sliding material, and both ends are provided. And a laminated rubber connected to each of the mounting substrates.

Here, the invention according to claim 2 is characterized in that a plurality of the seismic isolation devices according to claim 1 are laminated, and the invention according to claim 3 is characterized in that The invention according to claim 1 or 2, wherein a laminated rubber is provided between the sliding member and the mounting substrate. Furthermore, the invention described in claim 4 is:
The invention according to claim 3 is characterized in that a height adjusting member is provided between the laminated rubber of the sliding member and the mounting substrate.

According to the present invention, the sliding member and the sliding plate are surrounded by the annular laminated rubber, and both ends of the laminated rubber are connected to the mounting board. Thereby, the sliding surface of the sliding material and the sliding plate is isolated from the outside air, and deterioration of the surface state such as adhesion of dust to the sliding surface and generation of rust on the sliding surface can be suppressed, Therefore, it is possible to secure reliable sliding between the sliding member and the sliding plate, and to always realize high seismic isolation performance. Further, since the sliding surface between the sliding member and the sliding plate is covered by using the laminated rubber of the laminated rubber bearing which is generally used in combination, the number of components does not increase.

The seismic isolation device according to the first aspect of the present invention improves stability in the horizontal direction as a result of the integrated combination of the laminated rubber bearing and the sliding bearing. By stacking the seismic isolation devices as described above, it is possible to adjust the seismic isolation characteristics of the seismic isolation devices, and thereby easily correspond to the seismic isolation characteristics required for each structure.

Further, as in the invention according to claim 3,
By providing a laminated rubber between the sliding material and the mounting board, to form an elastic sliding bearing on a pair of mounting boards,
During a small or medium-scale earthquake, the horizontal seismic force can be reduced without causing the sliding material to slide with the sliding plate, and during a large earthquake, the horizontal sliding force can be reduced by sliding between the sliding material and the sliding plate. Seismic force can be reduced, and an efficient seismic isolation function can be obtained.

At this time, since the height dimension of the laminated rubber in the laminated rubber bearing is different from the height dimension of the laminated rubber in the elastic sliding bearing, when interposed between the upper and lower structures,
There is a possibility that the compression amounts are different from each other, and the mutually required characteristics cannot be exhibited. Therefore, by providing a height adjusting member between the laminated rubber used for the elastic sliding bearing and the mounting board as in the invention according to claim 4, the sliding plate and the sliding material and the inner laminated rubber are provided. By adjusting the relative positional relationship, the thickness of the inner laminated rubber and the outer laminated rubber can be finally set to a thickness dimension that can obtain the above required characteristics.

[0014]

(Embodiment 1) FIG. 1 shows a seismic isolation structure in which a first embodiment of a seismic isolation device according to the present invention is interposed, and a building 20 as an upper structure is shown. A plurality of seismic isolation devices A are provided between the building 20 and the concrete foundation 21 at predetermined horizontal intervals between the building 20 and the concrete foundation 21 as a lower structure.

As shown in FIG. 2 and FIG. 3, each of these seismic isolation devices A is mounted on the concrete foundation 21 with a pair of mounting boards 22 mounted on the building 20 and the concrete foundation 21 in opposition to each other. Mounting board 22
A sliding plate 23 provided integrally with the sliding member 22 and a sliding member 24 provided on the mounting board 22 mounted on the building 20 and slidably contacting the sliding plate 23;
Are provided so as to surround the sliding plate 23 and the sliding member 24, and both ends of the mounting substrate 22
2 is connected to the laminated rubber 25.

More specifically, as shown in FIG. 3, the slide plate 23 is formed in a disk shape from rust-resistant stainless steel, and is horizontally mounted on a mounting substrate 22 mounted on the concrete foundation 21. It is installed integrally in a state, and its outer diameter is formed smaller than the outer diameter of the mounting board 22. The sliding member 24 is formed in a disk shape with fluororesin (PTFE) and has an outer diameter smaller than that of the sliding plate 23, and is brought into surface contact with the upper surface of the sliding plate 23. .
Further, in the present embodiment, a laminated rubber 26 made of a columnar chloroprene rubber having a predetermined thickness is integrally mounted on the upper surface of the sliding member 24.
A height adjusting member 27 is integrally connected to the center of a mounting board 22 attached to the building 20 and is integrally connected to the upper part of the sliding board 23 and the sliding member 2.
4, by the laminated rubber 26 and the height adjusting material 27,
A so-called elastic slide bearing is configured.

On the other hand, the sliding plate 23, the sliding member 24,
The laminated rubber 25 provided around the laminated rubber 26 and the height adjusting member 27 is formed in an annular shape from the same chloroprene rubber as the laminated rubber 26, and both ends thereof are arranged as shown in FIG. , Each mounting board 2
2 and the sliding surface of the sliding plate 23 and the sliding member 24 is isolated from the outside air by the laminated rubber 25.
22 and the laminated rubber 25 constitute a laminated rubber bearing.

Next, the operation of the seismic isolation device A having the above configuration will be described. As shown in FIG. 1, a plurality of the seismic isolation devices A are interposed at predetermined positions between the concrete foundation 21 and the building 20, and the respective mounting boards 22 As shown in (1), the concrete foundation 21 and the building 20 are installed in a structure by being connected via anchor bolts 28 provided on the building 20. In this state, the weight of the building 20 is supported by the height adjusting member 27, the inner laminated rubber 26, the sliding member 24, the sliding plate 23, and the lower mounting substrate 22 from the upper mounting substrate 22 and the outer mounting substrate 22. Laminated rubber 2
5 has little effect.

When a small-scale or medium-scale earthquake occurs, the inner disk-shaped laminated rubber 26 and the outer annular rubber 25 are elastically deformed in the shearing direction, so that the building 20 is deformed. The transmitted seismic force can be reduced, and the period of the shaking of the building 20 can be increased to ensure the soundness of the building 20. Further, when a large-scale earthquake that causes the inner laminated rubber 26 to deform beyond the allowable range of elastic deformation thereof (indicated by E in FIG. 4) occurs, as shown in FIG.
At the time when the deformation amount of the inner laminated rubber 26 reaches the allowable amount E, the slide member 24 slides on the slide plate 23 (the relative movement amount of the two mounting substrates 22 at this time, As indicated by F in FIG. 4, the slip amount of the sliding member 24 is FE, and the horizontal seismic force acting on the building 1 is expressed by the sliding force between the sliding member 24 and the sliding plate 23. By converting it into heat energy generated at the time and releasing it into the air, together with further elastic deformation of the outer laminated rubber 25, the horizontal seismic force is reduced and the integrity of the building 20 is ensured. be able to.

In the seismic isolation device A of this embodiment, the sliding surface of the sliding plate 23 and the sliding member 24 constituting the elastic sliding bearing is covered by the outer laminated rubber 25 constituting the laminated rubber bearing. In addition, by being configured to be isolated from the outside air, it is possible to prevent dust from adhering to the sliding surface and also to prevent water or the like from adhering to generate rust. it can. Therefore, it is possible to prevent a change in the surface state of the sliding surface and prevent a change in the contact state between the slide plate 23 and the slide member 24,
The above-described seismic isolation function by these slidings can be reliably maintained for a long time. In addition, the cover of the sliding surface,
Since it is performed using the laminated rubber of the laminated rubber bearing usually used in combination with the elastic sliding bearing, the number of parts does not increase and the assembly process does not become complicated.

The sliding member 24 and the height adjusting member 27
By providing the laminated rubber 26 between the sliding member 24 and the sliding member 24, the elastic sliding bearing is formed without causing sliding between the sliding member 24 and the sliding plate 23 during a small- or medium-scale earthquake as described above. The horizontal seismic force can be reduced, and the slip member 24 and the slide plate 23 can be
The horizontal seismic force can be reduced by sliding with
An efficient seismic isolation function can be obtained. Further, by providing the height adjusting member 27 made of a rigid body, even if the thickness of the inner laminated rubber 26 and the outer laminated rubber 25 having different required characteristics is set to a thickness at which the required characteristics can be obtained, the sliding plate 23 and the While maintaining the relative positional relationship between the sliding member 24 and the inner laminated rubber 26, they can be securely mounted together with the outer laminated rubber 25 between the pair of mounting substrates 22.

In the above embodiment, the sliding material 2
4 and the mounting board 22 between the laminated rubber 26 and the height adjusting material 2
7, the height adjusting member 27 is provided.
Can be directly brought into contact with the sliding plate 23 to make the height adjusting member 27 a sliding member 24. In the case of such a configuration, a seismic isolation function is generated by sliding of the sliding member 24 and the sliding plate 23 and elastic deformation of the outer laminated rubber 25 irrespective of the magnitude of the earthquake.

(Embodiment 2) Next, FIGS. 5 and 6
Based on the above, a second embodiment of the present invention will be described.
The seismic isolation device B of this embodiment is configured by stacking the seismic isolation device A shown in the first embodiment, and
And a concrete foundation 21.
Here, the seismic isolation device A positioned in the lower layer and the seismic isolation device A positioned in the upper part thereof
2 are brought into contact with each other, and are connected to each other by bolts 29 to be integrally connected.

With the above configuration, the seismic isolation characteristics of a single seismic isolation device A can be combined to provide different seismic isolation characteristics. Seismic isolation characteristics can be set according to various conditions.

[0025]

As described above, according to any one of the first to fourth aspects of the present invention, the sliding surface of the sliding plate and the sliding material for reducing the horizontal seismic force during an earthquake is laminated. By covering with rubber, the adhesion of dust to the sliding surface and the rust caused by the adhesion of water and the like are suppressed to prevent a change in the surface state, and thus the slip material and the slip plate during an earthquake are prevented. , And a stable and reliable seismic isolation function can be secured. Further, since the sliding surface of the sliding material and the sliding plate is covered by using the laminated rubber of the laminated rubber bearing which is generally used in combination, the number of components does not increase, and the manufacturing process is prevented. Does not incur complications.

In particular, by stacking the seismic isolation devices according to the first aspect of the present invention, it is possible to adjust the seismic isolation characteristics of the seismic isolation devices, thereby achieving the required seismic isolation. The elastic sliding bearing can be formed on the pair of mounting substrates by providing laminated rubber between the sliding member and the mounting substrate as in the invention according to claim 3. Therefore, during a small or medium-scale earthquake, the horizontal seismic force can be reduced without causing the sliding member to slide with the sliding plate, and during a large earthquake, the sliding member slides with the sliding plate. The horizontal seismic force can be reduced by the motion, and an efficient seismic isolation function can be obtained according to the magnitude of the earthquake.

Further, as in the invention according to claim 4,
By providing a height adjusting material between the laminated rubber used for the elastic sliding bearing and the mounting board, the relative positional relationship between the sliding plate, the sliding material and the inner laminated rubber is adjusted, and the final In addition, the thickness of the inner laminated rubber and the outer laminated rubber can be set to a thickness dimension that can obtain the above required characteristics.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a seismic isolation structure in which a first embodiment of a seismic isolation device according to the present invention is interposed.

FIG. 2 is a longitudinal sectional view showing the first embodiment of the seismic isolation device according to the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a longitudinal sectional view showing an operation state of the seismic isolation device of the first embodiment.

FIG. 5 is a longitudinal sectional view showing a seismic isolation structure in which a second embodiment of the seismic isolation device according to the present invention is interposed.

FIG. 6 is a longitudinal sectional view showing an operation state of the seismic isolation device of the second embodiment.

FIG. 7 is a longitudinal sectional view showing a conventional seismic isolation structure in which a seismic isolation device is interposed.

FIG. 8 is a front view showing one seismic isolation device shown in FIG. 7;

FIG. 9 is a front view showing the other seismic isolation device shown in FIG.

FIG. 10 is a front view showing an operation state of the seismic isolation device of FIG. 9;

FIG. 11 is a front view showing an operation state of the seismic isolation device of FIG. 9;

[Explanation of symbols]

 Reference Signs List 20 building (upper structure) 21 concrete foundation (lower structure) 22 mounting board 23 sliding plate 24 sliding material 25 (outside) laminated rubber 26 (inside) laminated rubber 27 height adjusting material A / B seismic isolation device

Claims (4)

[Claims] 1. A pair of mounting substrates which are attached to an upper structure and a lower structure in an opposed state, a slide plate provided on one of the mounting substrates, and a slip plate provided on the other mounting substrate side. A sliding member that is slidably abutted, and is provided so as to surround these sliding plates and the sliding member, and has a laminated rubber having both ends connected to the respective mounting substrates. Seismic isolation device. 2. A seismic isolation device comprising a plurality of the seismic isolation devices according to claim 1. 3. The seismic isolation device according to claim 1, wherein a laminated rubber is provided between the slip member and the mounting board. 4. The seismic isolation device according to claim 3, wherein a height adjusting member is provided between the laminated rubber of the sliding member and the mounting substrate.