JP2000345622A - Slide support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the coefficient of friction of a slide surface with a simple constitution. SOLUTION: In order to isolate the vibration of a footing 2 of a building and a concrete foundation 3 in a relatively displaceable manner to each other, laminate rubber support body 4 is fixed to the footing 2, a slide part 5 on which the laminate rubber support body 4 is placed is fixed to the concrete foundation, respectively, a sliding material 7 is provided on a slide surface 4a of the laminate rubber support body 4, and the slide surface 4a of the laminate rubber support body 4 is pressed against a slide surface 5a of the slide part 5 through water 10. Since water 10 of extremely small amount enters between the sliding material 7 and slide plate 4, the coefficient of friction of the slide surface can be reduced. A liquid filling wall 11 to movably support the laminate rubber support body 4 placed on the slide part 5 is fixed to the slide part 5 in a watertight manner. In addition, an expansion cover 12 is placed between the liquid filling wall 11 and the laminate rubber support body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bearing device used for seismic isolation, vibration isolation or vibration isolation of buildings and precision equipment.

[0002]

2. Description of the Related Art Conventionally, a sliding bearing device as shown in FIG. 3, for example, has been employed for seismic isolation, vibration isolation or vibration isolation of buildings, precision equipment, and the like. The sliding bearing device includes a laminated rubber bearing 21 fixed to a building 20 and a sliding plate 23 installed on a base plate 22 fixed to a concrete foundation 30 in advance, and a lower steel plate of the laminated rubber bearing 21. A low friction material 24 is fixed to 21A.

In the sliding bearing device thus constructed, the laminated rubber bearing 21 normally supports the vertical load of the building 20 without buckling, and the laminated rubber bearing 21 horizontally deforms during a small or medium-sized earthquake. Absorb the seismic force, and in the event of a large earthquake, the laminated rubber bearing 21 exceeds the amount of horizontal deformation, and the horizontal load applied to the laminated rubber bearing 21 exceeds the frictional force, so that the lower steel plate 21A of the laminated rubber bearing 21 The fixed low friction material 24 slides on the slide plate 23. The friction coefficient when the low friction material 24 and the sliding plate 23 are relatively displaced from each other is known to be 0.06 to 0.13 as a normal value.

[0004]

However, in such a sliding bearing device, the low friction material 24 and the sliding plate 23 are provided.
If the coefficient of friction of the sliding surface is high, slip does not occur even during a large earthquake, so that the seismic isolation effect cannot be exhibited.
Further, in order to reduce the friction coefficient of the low friction material 24 and the sliding surface of the sliding plate 23, special processing must be performed on the sliding surface of the sliding plate 23, or a special material must be used for the low friction material 24. Since various specialized techniques are required, such as not being necessary, the manufacturing cost is high. Further, when the state of the sliding surface of the sliding plate 23 changes due to adhesion of dust or the like or rust, the coefficient of friction changes and the response acceleration of the building during an earthquake increases. It exhibited behavior, and there was a problem in durability.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a sliding bearing device which can reduce the friction coefficient of a sliding surface with a simple structure.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a sliding bearing device according to the present invention has a structure in which a bearing is attached to an upper structure so that the upper structure and the lower structure are vibrationally insulated relative to each other. A sliding bearing device in which a sliding body on which a bearing body is mounted is fixed to a lower structure and a sliding member is provided on a sliding surface of the bearing body, wherein the sliding surface of the bearing body and the sliding plate are provided. The sliding surface is pressed by a fluid that reduces the coefficient of friction.

[0007] According to such a sliding bearing device, the bearing body slides on the sliding plate due to the horizontal load applied to the bearing body during a large earthquake exceeding the frictional force. During this time, a very small amount of fluid enters, so that the friction coefficient of the sliding surface can be reduced.

[0008] In the sliding bearing device of the present invention, a fluid-filled wall movably surrounding the bearing body mounted on the sliding plate may be fixed on the sliding plate in a watertight manner.
Thereby, the sliding surfaces of the bearing body and the sliding plate which are pressed against each other in the fluid filling wall can be immersed in the fluid whose friction coefficient is reduced.

[0009] In the sliding bearing device of the present invention,
A sprayer for spraying the fluid for reducing the friction coefficient on the slide plate may be provided. Thereby, even if the fluid on the surface of the slide plate evaporates, the fluid can be replenished periodically or continuously.

[0010] Further, in the sliding bearing device of the present invention, at least two types of fluids may be used as the fluid for reducing the friction coefficient. Thereby, for example, when the fluid filling wall is filled with water and further filled with oil, these liquids are separated into two layers due to a difference in specific gravity, so that it is possible to prevent dust and the like from being mixed in the upper layer oil, The coefficient of friction can be reduced by the water in the lower layer.

Further, in the sliding bearing device of the present invention, it is preferable that a telescopic cover is provided between the fluid filling wall and the bearing body. Thereby, it is possible to prevent foreign substances from being mixed into the fluid.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sliding bearing device according to the present invention will be described below with reference to the drawings.

[0013] The sliding bearing device of the present invention vibrationally insulates the upper structure and the lower structure so that they can be displaced relative to each other.
As shown in FIG. 1, a laminated rubber bearing 4 fixed to a footing 2 of a building as an upper structure, and a slide plate 5 fixed to a concrete foundation 3 as a lower structure,
A laminated rubber bearing 4 fixed to a footing 2 of a building is placed on a sliding plate 5 fixed to a concrete foundation 3.

The laminated rubber bearing 4 has a laminated rubber body 40 formed by laminating a rubber layer 43 and an intermediate steel plate 44 between an upper connecting steel plate 41 and a lower connecting steel plate 42. , An upper mounting plate 6 and a sliding member 7 are fixed to the surface of the lower connecting steel plate 42, respectively. Rubber layer 43
The synthetic rubber such as natural rubber or chloroprene rubber excellent in elasticity is used for the upper connecting steel plate 41,
A rubber layer 43 is provided on the lower connecting steel plate 42 and the intermediate steel plate 44.
Usually, a steel plate is used because of its adhesiveness with a nickel plate,
A copper plate, a brass plate, or a steel plate subjected to nickel plating, copper plating, or brass plating can also be used. The laminated molding of the laminated rubber support 4 is preferably vulcanized, but may be non-adhered, partially adhered, or post-adhered. Further, as the laminated rubber body 40, any of an exposed intermediate steel plate type and a coated intermediate steel plate type may be used.

The upper mounting plate 6 is fixed to an upper base plate 8 fixed to the footing 2 of the building, and the sliding material 7 is fixed to a lower base plate 9 buried in the concrete foundation 3 to a predetermined depth in advance. 5 is pressed.

The sliding surface 4a of such a laminated rubber bearing 4
The sliding surface 5a of the sliding plate 5 is pressed against the sliding surface 5a via water 10, which is a fluid that reduces the coefficient of friction. Specifically, a liquid-filled wall 11 that movably surrounds the laminated rubber bearing body 4 placed on the slide plate 5 is fixed on the slide plate 5 in a watertight manner, and water 10 is contained in the liquid-filled wall 11. Is filled. Thereby, each sliding surface 4a of the laminated rubber bearing body 4 and the sliding plate 5 which are pressed against each other in the liquid filling wall 11,
Since 5a can be immersed in water, a very small amount of water 10 enters between the sliding member 7 and the sliding plate 5, so that the friction coefficient of the sliding surface can be reduced. In addition, by covering the entire surface of the sliding plate 5 with the water 10, it is possible to prevent intrusion of dust from the outside and deterioration of the surface of the sliding plate 5, thereby improving the durability of the sliding plate 5 and the sliding material 7. .

As the material of the sliding plate 5 and the sliding material 7, stainless steel is preferable in consideration of rusting caused by water. However, if rigidity can be maintained, engineering plastics or non-ferrous metals can be used. Further, in consideration of rusting of the lower connecting steel plate 42 and the like, it is preferable that the filling amount of the water 10 does not soak the lower connecting steel plate 42.
Further, in order to prevent foreign matter from being mixed into the water 10 filled in the liquid filling wall 11, a telescopic cover 12 may be provided between the liquid filling wall 11 and the laminated rubber support 4. Thereby, it is possible to prevent foreign matter from entering the water 10.

The sliding bearing device 1 configured as described above has the following features.
Normally, the laminated rubber bearing 4 supports the vertical load of the building without buckling. Further, at the time of a small-to-medium-sized earthquake, the laminated rubber bearing 4 is horizontally deformed to absorb the seismic force. At this time, no sliding occurs between the sliding member 7 and the sliding plate 5 of the laminated rubber support 4 due to the frictional force. Further, at the time of a large earthquake, the laminated rubber bearing 4 exceeds the amount of horizontal deformation, and the laminated rubber bearing 4
Since the horizontal load applied to the member exceeds the frictional force, the laminated rubber bearing member 4 can slide on the slide plate 5. At this time, since a very small amount of water 10 enters between the sliding member 7 of the laminated rubber support 4 and the sliding plate 5, the sliding surface 4a,
5a can be reduced. Therefore, the history curve of horizontal load-horizontal displacement indicates low rigidity and large deformation, so that the period of seismic isolation or the like can be made longer.

Thus, even if the friction coefficient of the sliding member 7 and the sliding plate 5 itself is high, the friction coefficient of the sliding surfaces 4a, 5a can be reduced. The sliding surface 5a of the sliding plate 5
, And the friction coefficient of the sliding surfaces 4a and 5a can be reduced without using special processing for the sliding member 7 or using a special material for the sliding member 7. Furthermore, since the elastic cover 12 is provided between the liquid filling wall 11 and the laminated rubber support 4 to prevent foreign matter from entering the water 10, the durability can be improved.

In the embodiment of the present invention,
Although water is used for the fluid, the invention is not limited to this, and liquid such as alcohol or oil or gel may be used. Further, an antifreeze agent or the like may be mixed in consideration of use at a low temperature. Further, at least two types of liquids may be used for the fluid. For example, when the liquid filling wall 12 is filled with water and further filled with oil, these liquids are separated into two layers due to a difference in specific gravity, so that dust in the upper layer can be prevented from being mixed with the upper layer oil, and the lower layer water can be prevented. Thus, the friction coefficient can be reduced. Further, a lubricating emulsion may be used.

In the embodiment of the present invention,
Each sliding surface 4a, 5a of the laminated rubber support 4 and the sliding plate 5
Was immersed in water, but the invention is not limited to this. As shown in FIG. 2, the liquid is scattered (FIG. 2 (a)) and the liquid is sprayed (FIG. 2 (b)).
Water spraying may be used, and any of the spraying methods can reduce the friction coefficient. In this case, a sprayer (not shown) for spraying the liquid on the slide plate 5 may be provided so that the liquid on the surface of the slide plate 5 does not evaporate. This allows
Since the liquid can be supplied to the sliding plate 5 periodically or continuously, it is possible to prevent the liquid on the surface of the sliding plate 5 from evaporating.

[0022]

EXAMPLES Further, an experiment was conducted on the sliding performance of the sliding bearing device of the present invention under the following conditions. In the experiment, a sliding bearing device having a structure as shown in FIG. 1 was used, and the lower base plate 9 was made of a rolled steel material for general structure (SS40).
0), stainless steel (SUS304) for the sliding plate 5, polytetrafluoroethylene (PTFE) for the sliding material 7,
Water 10 was used for each fluid.

As a result of the experiment, the coefficient of kinetic friction was 0.10 before filling with water, whereas the coefficient of kinetic friction became 0.04 when filling with water. As a result, it was confirmed that when the sliding surfaces 4a, 5a of the laminated rubber support 4 and the sliding plate 5 were immersed in water, the dynamic friction coefficient was reduced.

[0024]

As described above, according to the sliding bearing device of the present invention, by injecting the fluid between the sliding material and the sliding plate, the sliding plate does not need to be specially processed. In addition, the friction coefficient can be reduced without using a special material such as know-how as a sliding material. As a result, the coefficient of friction can be reduced with a simple configuration, so that a low-cost device can be supplied and the range of application can be widened.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a preferred embodiment of a sliding bearing device according to the present invention.

FIG. 2 is a view showing a state of spraying a liquid on a sliding plate;
(A) is an explanatory view of the liquid scattered, (b) is an explanatory view of the spray.

FIG. 3 is an explanatory view showing a conventional slide bearing device.

[Explanation of symbols]

 1 ... Sliding bearing device 2 ... Footing of building (upper structure) 3 ... Concrete foundation (lower structure) 4 ... Laminated rubber bearing 4a ... ... Sliding surface 5 ... Sliding plate 7 ... Sliding material 10 ... Water (fluid) 11 ... Liquid filling wall (fluid filling wall) 12 ... ..Expandable covers

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeo Fukuda 2-1-1, Sakae Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Showa Electric Wire & Cable Co., Ltd. 3J048 BA08 BG04 DA03 EA38

Claims (5)

[Claims] 1. A sliding member on which a bearing is mounted on the upper structure and a bearing on which the bearing is mounted is mounted on the lower structure in order to insulate the upper structure and the lower structure so that they can be displaced relative to each other. A sliding bearing device in which a plate is fixed, and a sliding material is provided on a sliding surface of the bearing, wherein the sliding surface of the bearing and the sliding surface of the sliding plate reduce a coefficient of friction. A sliding bearing device, which is pressed into contact with the sliding bearing device. 2. A sliding body according to claim 1, wherein a fluid-filled wall movably surrounding said support mounted on said sliding board is fixed on said sliding board in a watertight manner. Bearing device. 3. The slide bearing device according to claim 1, further comprising a sprayer for spraying the fluid for reducing the coefficient of friction on the slide plate. 4. The sliding bearing device according to claim 2, wherein the fluid that reduces the coefficient of friction is at least two kinds of liquids. 5. A telescopic cover is provided between the fluid filling wall and the support body.
Or the sliding bearing device according to 4.