JP3067578B2 - Flexible bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support for vibration control of a building structure, a mechanical device or the like or a support for supporting a dynamic vibration absorber for vibration control.

[0002]

2. Description of the Related Art Conventionally, various types of laminated rubber bearings have been developed for this purpose.
(See "Model Buildings with" Seismic Isolation Building "Declared to Open at the Same Time.", Nikkei Architecture, July 14, 1986, pp. 54-75.) The most common conventional laminated rubber bearing is the structure. There is a type in which thin rubber and an iron plate are alternately stacked and sandwiched between upper and lower end plates for attachment to an object. FIG. 7 is a diagram of a conventional rubber bearing of a cylindrical internal solid type. However, when using a solid internal bearing to support a relatively lightweight structure such as a wooden building structure, a mechanical device, or a dynamic vibration absorber with the same vertical stress level as when the heavy load is large, the cross-sectional area is small. It becomes a small bearing, and the allowable deformation in the horizontal direction becomes small. FIG.
(A), (b) is a figure which shows the inconvenience at the time of supporting a small structure with the conventional laminated rubber.

[0003] When a lightweight structure is supported by using a rubber bearing having a solid interior as described above, it has been difficult to realize a small allowable deformation in the horizontal direction and a long natural period.

[0004] Therefore, there has been developed one in which the inside of the cylindrical shape is hollow, the shearing rigidity in the horizontal direction is reduced, and the deformability in the horizontal direction is enhanced. FIG. 9A is a diagram of a basic rubber bearing in which the inside is hollow by laminating rubber and an iron plate in a ring shape. However, a laminated rubber bearing having a hollow inside has a low shearing rigidity and exhibits a large deformability, but is unfavorable because the bending rigidity and the vertical load resistance are reduced. To solve this problem, for example, from the vertical center of the laminated rubber to the both ends in the vertical direction, the ring width in the horizontal section is continuously increased to make it difficult to buckle (Japanese Patent Application Laid-Open No. 5-141463), or a hollow laminated rubber is used. Are stacked in the vertical direction via a joining plate to obtain a predetermined low shear rigidity (Japanese Patent Application Laid-Open No. 5-141464). However, the processing disclosed in Japanese Patent Application Laid-Open No.
In Japanese Patent Application Laid-Open No. 5-141464, the proportions of diameter and height are vertically elongated, and there is a concern that bending rigidity as a bearing may be reduced. Another method is to increase the thickness of the iron plate to be sandwiched. In this method, the rubber is relatively thin, and the inherent properties of the laminated rubber, that is, the shear rigidity in the horizontal direction is small, are lost, which is inconvenient. If the rubber thickness is increased as it is, the overall height of the bearing will be increased, and the bending rigidity will be reduced. FIG. 9B is a diagram of the bearing in which the thickness of the iron plate to be sandwiched is increased.

The present invention has been devised to solve such a problem.

[0006]

SUMMARY OF THE INVENTION A thin rubber having an internal hollow closed section and a steel sheet also having an internal hollow closed section are provided.
Alternately in a flexible bearing laminated multilayer, a portion at predetermined intervals of the <br/> laminated steel plates, placed in a thicker steel plate
The gist is a flexible bearing characterized by being replaced .

[0007]

FIG. 1 is a view showing a flexible bearing according to the present invention.

[0008] Thick iron plates are involved in transmitting stress acting upon deformation of the entire bearing, and thin iron plates are effective in thinning the rubber layer. That is, the thick iron plate keeps the plane of the cross section and secures the bending rigidity, while the thin rubber layer and the thin iron plate alternate layers,
Increases vertical rigidity and achieves low horizontal shear rigidity.

FIG. 2 is a view showing a state where the flexible bearing of the present invention is horizontally deformed.

Since the bending rigidity of the thick iron plate is high, and the alternating layers of the thin rubber and the thin iron plate have low shearing rigidity, the bearing causes horizontal deformation while maintaining a flat surface as a whole. Further, since the rubber is divided by a thin iron plate, the longitudinal elastic coefficient of the bearing is high and the vertical load resistance is improved. By both of these actions, stable load support is realized.

FIG. 3 is a view showing a state in which a conventional bearing having a hollow rubber layer and a thin iron plate alternately horizontally deforms. The rigidity of the iron plate is low, and therefore, the bending rigidity as a bearing is poor and stable load support is difficult. In addition, yield strength of the steel sheet occurs early, so that the yield strength is reduced.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a flexible bearing according to the present invention.

FIG. 1A is a vertical sectional view of a flexible bearing according to the present invention, and FIG. 1B is a top view. A thin rubber 2 thin iron plate 3 in a ring shape so as to be hollow in the vertical Despite his interbedded thick iron plate 4 a block having an array of stacked plurality of sets, upper and lower end plate 1 for mounting to a structure
In this way, the structure is sandwiched.

For example, outer diameter φ600mm, inner diameter φ360m
m, rubber thickness 2-3mm, thin iron plate thickness 3-4m
m, the thickness of the alternating layer of rubber and thin iron plate is 15-20m
m, the thickness of a thick iron plate is 9 to 12 mm, and the total height is 1200 mm.
0Kg / cm ^{2 and} about 2 for a 25Ton supporting load.
It only causes a vertical deformation of cm. On the other hand, the horizontal rigidity is about 5
0-100Kgf / cm, 3 ~ against 25Ton of supporting load
It is possible to support with a period of 5 seconds. Also, it is considered that the amount of deformation of the flexible bearing in the horizontal direction can maintain a linear state up to about ± 50 cm.

[0015]

According to the present invention, a thick iron plate contributes to stress transmission acting upon deformation of the entire bearing, and a thin iron plate is effective in thinning the rubber layer. That is, a thick iron plate secures vertical load bearing strength and bending rigidity, while an alternate layer of a thin rubber layer and a thin iron plate can realize a flexible shear rigidity that allows a large deformation.

Accordingly, a relatively lightweight dynamic vibration absorber (vibration control device for a super-high-rise building) can be realized as a system having a natural period of 3 to 5 seconds. It is extremely effective in the case of vibration having a relatively long period, such as. FIG. 4 is a diagram in which the flexible bearing of the present invention is applied to a dynamic vibration absorber installed in a high-rise building.

Further, since the shear rigidity is low, it can be sufficiently applied to a seismic isolation bearing for a light-weight building such as a wooden building, which has heretofore been impossible. FIG. 5 is a diagram in which the flexible bearing of the present invention is applied to a wooden building.

The bearing of the present invention can also be applied to floor seismic isolation for installing mechanical equipment.

FIG. 6 is a diagram in which the bearing of the present invention is applied to seismic isolation of the floor of a computer room or the like.

[Brief description of the drawings]

FIG. 1 (a) is a vertical sectional view of a flexible bearing of the present invention, and FIG. 1 (b) is a top view.

FIG. 2 is a view showing a state where the flexible bearing of the present invention is horizontally deformed.

FIG. 3 is a view showing a state in which a conventional bearing having a hollow rubber layer and an alternating layer of a thin iron plate is horizontally deformed.

FIG. 4 is a diagram in which the flexible bearing of the present invention is applied to a dynamic vibration absorber installed in a high-rise building.

FIG. 5 is a diagram in which a flexible bearing of the present invention is applied to a wooden building.

FIG. 6 is a diagram in which the bearing of the present invention is applied to seismic isolation of a floor in a computer room or the like.

FIG. 7 is a diagram of a conventional rubber bearing having a cylindrical inner solid type.

FIGS. 8A and 8B are diagrams showing disadvantages when a small structure is supported by a conventional laminated rubber.

FIG. 9 (a) is a diagram of a basic rubber bearing in which the inside is hollowed by laminating rubber and an iron plate in a ring shape.
(B) is a diagram of a bearing in which the thickness of an iron plate to be sandwiched is increased.

[Explanation of symbols]

1 ... End plate, 2 ... Laminated rubber, 3 ...
Thin iron plate, 4 ... thick iron plate, 5 ... flexible bearing of the present invention, 6 ... conventional rubber bearing, 7 ... large structure, 8 ... small structure, 9 ... moving Vibration absorber, 10
..High-rise buildings, 11 ... Light-weight buildings, 12 ... Computers, 13 ... Seismically isolated floors

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-54406 (JP, A) JP-A-3-163231 (JP, A) JP-A-63-293340 (JP, A) JP-A-59-1984 179970 (JP, A) Japanese Utility Model Showa 64-23504 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/36 E04H 9/02 331 F16F 15/04

Claims (1)

(57) [Claims] 1. A thin rubber having an internal hollow closed cross section,
In likewise flexible support laminated to the multilayer steel sheets having an internal hollow closed cross section alternately, a portion of the laminated steel plates
The at predetermined intervals, a flexible support, which was characterized by being replaced with a thicker steel plate.