JP5226894B1 - Seismic isolation device - Google Patents

Abstract

A seismic isolation device that can be installed at low cost and is easy to maintain after installation.
A seismic isolation device installed between a structure and the ground, the support fixed to one of the structure and the ground, and provided at a tip of the support. A support plate having a convex curved surface, and a receiving plate fixed to the other of the structure and the ground and having a concave curved surface that is slidable with the convex curved surface facing each other, and the convex curved surface has a central portion And has a radius of curvature smaller than that of the concave curved surface at an outer edge portion that is outside the central portion.
[Selection] Figure 1

Description

  The present invention relates to a seismic isolation device that is installed between a structure and the ground, makes it difficult to transmit ground shaking due to an earthquake or the like to the structure, and restores the position of the structure after the shaking has settled. .

  As a device for protecting a structure such as a house from shaking of the ground due to an earthquake or the like, a seismic isolation device installed between the structure and the ground (foundation) is known. This seismic isolation device makes it difficult to transmit the shaking of the ground due to an earthquake or the like to a structure, and has recently been installed rapidly.

  As the seismic isolation device, (1) a type in which laminated rubber with alternating rubber and steel plates is used, and the elasticity of the rubber allows it to swing slowly in the horizontal direction during an earthquake. (2) Mainly tetrafluoroethylene resin By installing a slip material made of the component material directly under the pillar and sliding it on a specially treated steel plate (slip partner), we prevented the earthquake from being transmitted to the building as much as possible. Type (3) It is known that the load of the building is supported by a ball bearing, and the ball bearing rolls on the rail and moves in the event of an earthquake so that the earthquake vibration is not transmitted to the building as much as possible. In recent years, (3) type seismic isolation devices tend to be used, and seismic isolation devices having various structures have been developed.

  In Patent Document 1, a support that is fixed to a foundation and a ball that is fixed to a building and rolls on the support when the foundation and the building are relatively displaced are held rotatably. There is disclosed a seismic isolation device including a ball holder. The support body is located at the center of the support body and has a support surface on which a support surface for supporting the ball is cured when the building is stationary, a support block positioned around the support block, and the building structure. And a support plate having a rolling surface on which the ball rolls when the ball is displaced.

  Patent Document 2 discloses a concave surface as a sliding bearing rolling base for mounting a sliding bearing composed of a plurality of rolling spheres and a cage for maintaining the spheres in a fixed arrangement under a building frame and rolling the sliding bearing. There is disclosed a seismic isolation device in which an impact buffering device in which a plurality of elastic bodies and flat plates are stacked under a disk-shaped plate is placed on a device fixing plate and installed on the foundation of a building. Then, the sliding bearing is placed directly above the sliding bearing rolling table, and an auxiliary device that controls the movement in all directions due to the earthquake is arranged around the sliding bearing and the sliding bearing rolling table to support the load of the building, The vibration displacement is controlled by a spherical rolling device that operates against a large vibration displacement caused by an earthquake, an impact buffer device made of an elastic body, and the weight of the building.

  Patent Document 3 discloses a sliding vibration isolator that eliminates the destruction of a building main body by slipping on a sliding support portion attached between a building foundation and a foundation and escaping the seismic force generated by the earthquake. And the sliding support part is a steel material composed of a hemispherical part and a cylindrical part coupled on the hemispherical part, and an attachment in which a mounting hole for welding to the building base is formed. An iron plate is provided and is fastened to the base by a base through bolt inserted through the mounting hole.

JP 2002-188316 A JP 2007-239990 A Utility Model Registration No. 3124531

  However, the technique using the ball (spherical body) described in Patent Documents 1 and 2 requires a mechanism for holding the ball in a rollable state, which increases the cost. In addition, since the ball and the table on which the ball rolls are basically in point contact, the strength required for both of them to support the weight of the upper structure is inevitably high, which also increases the cost. It has become. If it is assumed that the number of balls installed will be increased, the strength required for both will be reduced, so it is possible to reduce the cost of one seismic isolation device, but the number of balls installed increases, so the installation cost is considered. This does not lead to a total cost reduction.

  Since the sliding support part described in Patent Document 3 is not ball-shaped, a mechanism for holding it is unnecessary, and it is considered that there is a certain effect in cost reduction. However, since the sliding bearing and the base are in point contact, there is a limit to cost reduction. Moreover, in the seismic isolation apparatus described in Patent Document 3, since the base is horizontal, the sliding support portion does not return to the original position after the sliding in the event of an earthquake.

  Then, an object of this invention is to provide the seismic isolation apparatus which can be installed cheaply and is easy to maintain after installation.

A seismic isolation device according to the present invention is a seismic isolation device installed between a structure and the ground, the support fixed to either the structure or the ground, and the tip of the support A support plate having a convex curved surface, and a receiving plate fixed to the other of the structure and the ground and having a concave curved surface that is slidable with the convex curved surface facing each other. It has its central portion has the same radius of curvature as the concave curved surface at the center said to have a smaller radius of curvature concave surface at the outer edge portion which is positioned outside the said receiving of the concave curved surface and the support plate of the plate whole or in part, that covered with a gel-like material.
The seismic isolation device according to the present invention is a seismic isolation device installed between a structure and the ground, the support fixed to either the structure or the ground, and the support A support plate having a convex curved surface fixed to the tip of the substrate, and a receiving plate having a concave curved surface fixed to the other of the structure and the ground and slidable with the convex curved surface facing each other, The convex curved surface has the same radius of curvature as the concave curved surface at the center, and has a smaller radius of curvature than the concave curved surface at the outer edge portion that is outside the central portion.

  ADVANTAGE OF THE INVENTION According to this invention, the seismic isolation apparatus which can be installed cheaply and can be maintained easily after installation can be provided.

It is side sectional drawing which shows the state which installed the seismic isolation apparatus which concerns on one Embodiment of this invention in the house. It is a top view of the seismic isolation apparatus of FIG. 2 is a side cross-sectional view showing a state where the convex curved surface of the support plate slides on the concave curved surface of the receiving plate when the ground shake due to an earthquake or the like occurs in the seismic isolation device of FIG. FIG. 4 is a side sectional view showing a state in the vicinity of a contact portion between a support plate and a receiving plate in FIG. 3.

  The seismic isolation device according to the present invention is installed between a structure and the ground, and makes it difficult to transmit the shaking of the ground due to an earthquake or the like to the structure. In addition, a structure is a concept including a building, and generally refers to a structure made of a plurality of materials and members and having a structure in which the weight is supported by a foundation on the ground side. Specific examples include houses, office buildings, stations, airports, temples, shrines, churches, castles, palaces, stadiums, theaters, hospitals, clinics, hotels, inns, factories, various facilities, schools, gymnasiums, museums, Exhibition halls, stores, warehouses, garages, TV studios, exhibition stands, storage stands, etc.

  FIG. 1 is a side sectional view showing a state where a seismic isolation device according to an embodiment of the present invention is installed in a house, and FIG. 2 is a plan view of the seismic isolation device. The seismic isolation device of FIG. 1 includes a support column 10 as a support, a support plate 20, and a receiving plate 30.

  The support | pillar 10 is being fixed toward the perpendicular direction to the house 1 which is a structure. The cheek cane 2 may be installed so that the fixation can withstand horizontal force. The column 10 may have a cylindrical shape, a prismatic shape such as a triangular prism or a quadrangular prism, or a cross-shaped cross section. The column 10 may be hollow as long as the required strength can be maintained. Examples of the material for forming the column 10 include metal, wood, plastic, and the like, but metal is preferable. Examples of the metal include stainless steel and iron. The thickness of the column 10 can be set as appropriate so that the required strength can be maintained.

  The support plate 20 is provided below the tip of the support column 10, and the lower surface thereof is a convex curved surface. On the other hand, the receiving plate 30 is fixed to the base concrete 5 on the ground side with bolts 6 and the upper surface thereof is a concave curved surface. In installing the receiving plate 30, for example, the base concrete 5 is first placed after adjusting the height of the receiving plate 30 with the bolt 6, and then the mortar is injected from the mortar injection hole 31 provided in the receiving plate 30. By injecting 7 without gaps, high compressive strength can be maintained.

  In the present invention, the convex curved surface of the support plate 20 is installed so as to contact the concave curved surface of the receiving plate 30. Normally, the convex curved surface does not move from the lowest position of the concave curved surface due to its own weight, but when the ground shakes due to an earthquake or the like, as shown in FIG. 3, it slides on the concave curved surface. Slide to. Thereby, it is possible to make it difficult to transmit the shaking of the ground due to an earthquake or the like to the house 1. When the ground shake due to an earthquake or the like is settled, the convex curved surface slides to slide down to the lowest position of the concave curved surface which is the original position due to the weight of the house 1. Thereby, after the shaking of the ground due to an earthquake or the like is settled, the position of the house 1 can be returned to the original position.

  Furthermore, in the present invention, the convex curved surface has the same radius of curvature as the concave curved surface at the central portion 21. By doing so, the contact area between the convex curved surface and the concave curved surface is increased (see FIG. 1). Since the weight of the house 1 is substantially supported by the contact portion between the convex curved surface and the concave curved surface, the strength required for the support plate 20 and the receiving plate 30 can be reduced by increasing the contact area. An inexpensive seismic isolation device can be realized.

  On the other hand, the convex curved surface has a smaller radius of curvature than the concave curved surface at the outer edge portion 22 outside the central portion 21 (see FIG. 4). By doing so, when the ground is shaken due to an earthquake or the like and the convex curved surface slides on the concave curved surface, the convex curved surface and the concave curved surface basically come into point contact (FIG. 3 and FIG. 3). 4). Therefore, after the ground shake due to an earthquake or the like is settled, the convex curved surface can be slid so as to easily slide down to the lowest position of the concave curved surface by the weight of the house 1.

  The curvature radius of the concave curved surface and the curvature radius of the central portion 21 of the convex curved surface can be appropriately set within a range in which the convex curved surface can be easily slid, but are preferably 100 to 800 mm, more preferably 300 to 600 mm, and further preferably 400 to 500 mm. For example, it can be 450 mm. The radius of curvature of the outer edge 22 of the convex curved surface can be set as appropriate within a range smaller than the radius of curvature of the concave curved surface. Therefore, it is preferable that the boundary between the center portion 21 and the outer edge portion 22 is smooth. Moreover, it is more preferable that the radius of curvature of the outer edge portion 22 of the convex curved surface is continuously reduced from the boundary with the center portion 21 toward the outer periphery.

  The convex curved surface of the support plate 20 is preferably circular when viewed from above. The diameter d1 of the convex curved surface of the support plate 20 as viewed from above is preferably 20 to 120 mm, more preferably 30 to 100 mm, still more preferably 40 to 80 mm, for example, 60 mm. The concave curved surface of the receiving plate 30 is preferably circular when viewed from above. The diameter d2 of the concave curved surface of the receiving plate 30 as viewed from above is preferably 100 to 600 mm, more preferably 200 to 400 mm, still more preferably 250 to 350 mm, for example, 300 mm.

  The central portion 21 of the convex surface of the support plate 20 is preferably located in the center of the convex surface of the support plate 20 and is circular when viewed from above. The diameter d3 of the central portion 21 of the convex curved surface of the support plate 20 viewed from above is preferably 80 to 98%, and preferably 85 to 95% of the diameter d1 of the convex curved surface of the support plate viewed from above. More preferably, it is more preferably 88 to 92%, for example, 90%.

  Examples of the material for forming the support plate 20 and the receiving plate 30 include metal, wood, plastic, rubber, and the like, but metal is preferable. Examples of the metal include stainless steel and iron. It is preferable that a lubricant is applied to the convex curved surface of the support plate 20. By doing so, the friction with the concave curved surface of the receiving plate 30 can be reduced, and when the ground shake due to an earthquake or the like occurs, the convex curved surface can slide smoothly on the concave curved surface, and the seismic isolation effect is possible even with a small shake. Can be demonstrated. It is preferable that a lubricant is applied also at least near the center of the concave curved surface of the receiving plate 30.

  The concave curved surface of the receiving plate 30 and the whole or part of the support plate 20 are preferably covered with a gel-like material. By doing so, the convex curved surface can be prevented from moving in the vertical direction when the ground shakes due to an earthquake or the like, and the contact portion between the convex curved surface and the concave curved surface is protected from wind and rain, and aged deterioration is suppressed. You can also.

  As the gel-like material, urethane-based, silicon-based, asphalt-based, or rubber-based gel-like materials can be used. The gel material used may be one kind or two or more kinds. That is, the layer formed by the gel material may be one layer or two or more layers. Moreover, after forming 1 layer with a gel-like thing, the method of changing a viscosity continuously from an upper layer part to a lower layer part can also be taken by making it high viscosity on-site.

  In particular, the support plate 20 and the receiving plate 30 up to a height where the support plate 20 exists are covered with a low-viscosity gel-like material (first gel-like material) 40, and the remaining receiving plate 30 and the low-viscosity gel-like material are covered. The product (first gel product) 40 is covered with a high viscosity gel product (second gel product) 41 having a higher viscosity than the low viscosity gel product (first gel product) 40. It is preferable. By doing so, the seismic isolation effect can be exhibited even with small shaking.

  The seismic isolation device according to the present invention as described above can be installed at low cost in a structure such as a house, and maintenance after installation is easy. In the above description, the embodiment in which the support is fixed to the structure and the receiving plate is fixed to the ground (base concrete) has been described, but the same effect can naturally be exhibited even if this is reversed. . That is, an embodiment in which the support is fixed to the ground (base concrete) and the receiving plate is fixed to the structure is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 House 2 Cheek stick 5 Base concrete 6 Bolt 7 Mortar 10 Prop 20 Support plate 21 Center part 22 Outer edge part 30 Receiving plate 31 Mortar injection hole 40 Low-viscosity gel substance (first gel object)
41 High-viscosity gel (second gel)
d1 Diameter of convex curved surface of support plate viewed from above d2 Diameter of concave curved surface of receiving plate viewed from above d3 Diameter of central portion of convex curved surface of support plate viewed from above

Claims (12)

A seismic isolation device installed between a structure and the ground,
A support fixed to one of the structure and the ground;
A support plate having a convex curved surface provided at the tip of the support;
A receiving plate that is fixed to the other of the structure and the ground and has a concave curved surface that is slidable with the convex curved surface facing each other;
The convex curved surface, the concave curved surface having the same radius of curvature as to have a smaller radius of curvature than the concave curved surface at the outer edge portion which is positioned outside the said central portion at its center,
Isolator all or part of the concave surface and the support plate of the receiving plate, that covered with a gel-like material.   The seismic isolation device according to claim 1, wherein each of the support plate and the receiving plate is made of metal.   The seismic isolation device according to claim 1, wherein a lubricant is applied to the convex curved surface. The support plate and the receiving plate up to the height where the support plate exists are covered with a first gel-like material, and the remaining receiving plate and the first gel-like material are the first gel. The seismic isolation device according to any one of claims 1 to 3, wherein the seismic isolation device is covered with a second gel-like material having a higher viscosity than the one . The seismic isolation device according to any one of claims 1 to 4 , wherein the support is fixed to the structure, and the receiving plate is fixed to the ground. The seismic isolation device according to any one of claims 1 to 4 , wherein the support is fixed to the ground, and the receiving plate is fixed to the structure. The seismic isolation device according to any one of claims 1 to 6, wherein the support plate is fixed to a tip of the support. A seismic isolation device installed between a structure and the ground,
A support fixed to one of the structure and the ground;
A support plate having a convex curved surface fixed to the tip of the support;
A receiving plate that is fixed to the other of the structure and the ground and has a concave curved surface that is slidable with the convex curved surface facing each other;
Have
The said convex curved surface has the same curvature radius as the said concave curved surface in the center part, and has a smaller radius of curvature than the concave curved surface in the outer edge part which is outside the said central part. The seismic isolation device according to claim 8, wherein each of the support plate and the receiving plate is made of metal. The seismic isolation device according to claim 8 or 9, wherein a lubricant is applied to the convex curved surface. The seismic isolation device according to any one of claims 8 to 10, wherein the support is fixed to the structure, and the receiving plate is fixed to the ground. The seismic isolation device according to any one of claims 8 to 10, wherein the support is fixed to the ground, and the receiving plate is fixed to the structure.

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