JP2007016466A - Bearing structure for seismically isolating building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing structure for seismically isolating a building, of which a rolling member or a sliding member is improved in rust prevention properties and in durability, to thereby improve the base isolation performance of the bearing structure. <P>SOLUTION: The bearing structure 1 constituting a base isolation structure of a building including a house, is formed of a rolling member 51 for rolling on a rolling contact surface 4a, a rolling bearing 5 provided with the rolling member 51, for bearing the building, and a ring member 6 which is interposed between the rolling bearing 5 and the rolling contact surface 4a to hermetically cover a peripheral surface of the rolling member 51, and has an upper edge 6a thereof attached to the rolling bearing 5 and a lower edge 6b thereof abutted on the rolling contact surface 4a. Herein grease 8 is encapsulated in a blocked region M enclosed by the rolling bearing 5, the rolling contact surface 4a, and the ring member 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a building isolation structure used for an isolation structure of a building such as a house.

Conventionally, a base-isolated structure constructed in a light building such as a house is often subjected to a rolling support using a ball bearing and a steel plate forming a rolling surface thereof. Usually, this rolling bearing is installed on the foundation of a building where dust is extremely generated, and the dust adheres to the bearing structure and deteriorates its function. For example, Patent Literature 1 and Patent Literature 2 disclose a bearing structure in which a cover member is attached to a rolling bearing to protect the ball bearing from dust.
In Patent Document 1, a support plate having a sliding surface is provided on the upper surface of a foundation, and a rolling bearing is provided between the support plate and the building so as to support the building with a ball bearing. Then, a substantially skirt-shaped cover member that covers the rolling surface is attached to the rolling bearing, and the ball bearing is positioned at the inner center thereof. The lower end of the cover member is slidably provided without being fixed to the rolling surface. With such a structure, it is supposed that foreign matter and water can be prevented from entering the cover member.
In Patent Document 2, a support plate having a rolling surface is provided on the lower surface of the structure and the upper surface of the foundation, and the structure is supported by providing a ball bearing between the support plates. And the cover body which consists of a material which can deform | transform so that the circumference | surroundings of a ball bearing may be sealed is fixed to both support plates. As a result, the dustproof and waterproof properties inside the cover body are improved.
Japanese Patent Laid-Open No. 10-306617 JP-A-9-268797

However, since the locations where the above-mentioned Patent Document 1 and Patent Document 2 and the conventional rolling bearings are installed are surrounded by the foundation and the outer wall of the building, they are rarely exposed to wind and rain. The humidity below the bottom floor is generally high. For this reason, in the ball bearing made of steel material, water adheres due to condensation or the like and rust is generated, and the rotational load of the ball bearing is increased. For this reason, there existed a problem that the seismic isolation performance of a rolling bearing fell.
Also, a plating method may be considered as a rust prevention measure for ball bearings. However, the plated layer coated during rolling of the ball bearing is damaged and has a drawback in durability such as peeling off, and there is a problem that the rolling function of the ball bearing is lowered.

  The present invention has been made in view of the above-described problems, and improves the rust prevention performance of the rolling material or the sliding material to increase the durability and improve the seismic isolation performance of the bearing structure. The purpose is to provide.

In order to achieve the above-mentioned object, in the building seismic isolation structure according to the present invention, the building is provided with a rolling material or sliding material that rolls or slides on the rolling surface or sliding surface, and the rolling material or sliding material. Cover the periphery of the rolling material or sliding material between the supporting main body and the supporting main body and the rolling or sliding surface, attach the upper end to the supporting main body, and bring the lower end into contact with the rolling or sliding surface. The cover member is provided, and a lubricant is enclosed in a closed region surrounded by the support body, the rolling surface or the sliding surface, and the cover member.
In the present invention, since the rolling material or the sliding material is filled with a lubricant and coated so that it does not come into contact with air, condensation does not occur on the rolling material or the sliding material to prevent water from adhering to it. Rust performance can be improved.

Further, in the building seismic isolation support structure according to the present invention, the cover member is preferably a rubber material.
In the present invention, due to the weight of the cover member and the elasticity of the rubber, the degree of close contact with the rolling surface or the sliding surface is increased, and the sealing performance of the closed region is further improved.

In the building seismic isolation structure according to the present invention, the lubricant is preferably a viscous material.
In the present invention, the lubricant is less likely to flow out from the contact surface between the cover member and the rolling surface or the sliding surface, and dust and water can be prevented from entering the closed region.

According to the building seismic isolation structure of the present invention, the rolling material or the sliding material is filled with a lubricant and covered with the surroundings so that it does not come into contact with air. Can be prevented and rust prevention performance can be improved.
Therefore, the durability of the bearing body can be improved without performing plating treatment on the rolling material or the sliding material as in the past, and the seismic isolation performance of the bearing structure can be improved without increasing the rolling load.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a side view showing a bearing structure according to an embodiment of the present invention, FIG. 2 is a partial longitudinal sectional view showing the structure of a rolling bearing, and FIG. 3 is a sectional view taken along line AA of the bearing structure shown in FIG.

  As shown in FIG. 1, the support structure 1 according to the present embodiment is used for a seismic isolation structure of a building such as a house, for example, and is fixed to a lower portion 2 a of a building housing 2. And the flat rolling steel plate 4 which has the rolling surface 4a is provided in the upper surface of the foundation 3. As shown in FIG.

As shown in FIG. 1, the support structure 1 includes a rolling support 5 (support main body) that supports a housing 2 of a building from below and is provided with a rolling surface 4 a so as to allow rolling. As shown in FIG. 2, the rolling support 5 includes a rolling member 51 that forms a sphere such as a ball bearing that rolls on the rolling surface 4a, a bearing member 52 that rotatably supports the rolling member 51, and a substantially box-shaped member. And an outer case 53 that covers the bearing member 52 by exposing the rolling portion 51 a of the rolling member 51.
A first sealing material 52a is provided between the rolling material 51 and the bearing member 52, and both 51 and 52 are in a liquid-tight state. Further, the connection between the outer case 53 and the bearing member 52 is liquid-tightly joined by, for example, packing (not shown) or the like.

As shown in FIGS. 1 and 2, a cylindrical ring that is covered between the outer case 53 and the rolling surface 4a so as to seal the periphery of the rolling material 51 and forms a ring shape in plan view. A member 6 (cover member) is provided. The ring member 6 is preferably made of a material such as nitrile rubber having high oil resistance, but is not limited to this material as long as the material has equivalent functions and durability.
As shown in FIG. 3, the bottom plate 53 a of the outer case 53 is formed with a ring-shaped groove 53 b having substantially the same diameter as the ring member 6. The groove 53 b is fixed so that the upper end 6 a of the ring member 6 is sandwiched through the second sealing material 7. The lower end 6b of the ring member 6 is in liquid-tight contact with the rolling surface 4a due to the weight of the ring member 6 and the elasticity of rubber.
When the rolling support 5 moves horizontally, the ring member 6 having such a structure moves horizontally together with the rolling support 5 while maintaining the state in contact with the rolling surface 4a.

As shown in FIG. 1, the support structure 1 is formed with a closed region M surrounded by a ring member 6, a rolling member 51, a bearing member 52, an outer case 53, and a rolling surface 4a. In this closed region M, a grease material 8 (lubricant) having excellent durability and viscosity such as silicon grease is enclosed.
Since the grease material 8 does not apply a rotational load to the rolling material 51, the rolling of the rolling material 51 is not hindered. Further, the grease material 8 does not flow outward from the closed region M because of its viscosity.
In addition, it is preferable to provide an injection hole (not shown) of the grease material 8 in the ring member 6 or the rolling support 5, and the grease material 8 can be filled in the closed region M using this injection hole.

In the building seismic isolation structure according to the present embodiment described above, the rolling material 51 is covered with the grease material 8 and covered with the surroundings so that it does not come into contact with the air. Can be prevented and rust prevention performance can be improved. Therefore, the durability of the rolling bearing 5 can be enhanced without performing plating treatment on the rolling material 51 as in the prior art, and the rolling load is not increased, and the seismic isolation performance of the bearing structure can be improved.
Further, in the building seismic isolation structure according to the present embodiment, since the closed region M is formed by fixing the ring member 6 to the rolling bearing 5 and bringing it into contact with the rolling surface 4a, the rolling structure is rolled. The dustproofness and waterproofness in the material 51 and the rolling surface 4a can be improved.

As mentioned above, although the embodiment of the building seismic isolation structure according to the present invention has been described, the present invention is not limited to the above embodiment, and can be changed as appropriate without departing from the scope of the present invention.
For example, in the embodiment, the rolling bearing 5 is provided with the rolling material 51. However, the rolling bearing 5 is not necessarily limited to the rolling bearing 5. For example, it is a sliding bearing provided with a metal sliding material instead of the rolling material 51. It doesn't matter.
In the embodiment, silicon grease is used as the grease material 8, but the material is not necessarily limited to this material. In short, the grease material 8 is a viscous lubricant, and it is sufficient that the closed region M is filled so as not to prevent the rolling material 51 from rolling.
In the embodiment, the upper end 6a of the ring member 6 is fixed to the bottom plate 53a of the outer case 53. However, the upper end 6a is not necessarily limited to this fixing position. For example, the upper end 6a is fixed to the side surface of the outer case 53 or the bearing member 52. 6a may be fixed.
Furthermore, in the embodiment, the ring member 6 has a ring shape in plan view, but may have other shapes, for example, a polygonal shape such as a quadrangle in plan view. The ring member is not limited to a rubber material, and may be a material such as a steel plate. And it is not limited to the integrated shape like this Embodiment, As long as the sealing degree is maintained, it may be divided | segmented how. In short, as shown in the embodiment, any member that can secure the closed region M between the rolling bearing 5 and the rolling surface 4a may be used.

It is a side view which shows the support structure by embodiment of this invention. It is a fragmentary longitudinal cross-section which shows the structure of a rolling bearing. FIG. 2 is a cross-sectional view of the support structure shown in FIG.

Explanation of symbols

1 Bearing structure 4 Rolling steel plate 4a Rolling surface 5 Rolling bearing (support body)
51 Rolling material 53 Outer case 6 Ring member (cover member)
8 Grease material (lubricant)
M blockage area

Claims (3)

A rolling material or sliding material that rolls or slides on the rolling surface or sliding surface;
A bearing body that supports the building with the rolling material or sliding material;
The periphery of the rolling material or sliding material was covered between the bearing body and the rolling surface or sliding surface, the upper end was attached to the bearing body, and the lower end was brought into contact with the rolling surface or sliding surface. A cover member;
With
A building-isolated bearing structure, wherein a lubricant is enclosed in a closed region surrounded by the bearing body, the rolling surface or sliding surface, and the cover member.   2. The building seismic isolation structure according to claim 1, wherein the cover member is made of a rubber material.   The building isolation structure according to claim 1 or 2, wherein the lubricant is a viscous material.

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