JP2730475B2 - High bending rigid laminated rubber bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial applications] Seismic isolation or floor isolation of building structures,
The present invention relates to bearings for mechanical structures, dynamic vibration absorbers, and the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, FIG. 8, or FIG. 9, a laminated rubber having an alternating layer structure of a rubber layer and a steel plate has been used. However, in this structure, the bending rigidity of rubber with respect to the bending moment M is low, and if the height is lower than the bottom area, the shearing rigidity is large, which is not applicable to long-period vibrations. When it is high, the bending rigidity is lacking, which is inconvenient.

[0003]

As described above, in a building whose height is relatively low with respect to the cross-sectional area of the building and the building does not cause bending deformation by seismic force, the bottom area and the height of the bearing are required. If the proportions are appropriately selected, the conventional laminated rubber bearing as shown in FIG. 7 effectively absorbs vibration.
This is because the building is considered to be a single rigid body because the bending deformation in the axial direction of the building is small, and the building takes a shear vibration behavior with the ground. However, when the height is higher than a certain level with respect to the cross-sectional area of the building, the behavior of the vibration is completely different in character from the rigid body vibration seen in a building having a low height. A building whose height is higher than the cross-sectional area of the building behaves like a kind of leaf spring. That is, the spring constant of the flexural vibration, which is regarded as the indeterminate beam with the center freely supported, decreases in inverse proportion to the nth power of the height (n> 1). Therefore, a large bending vibration is caused by a small external force. For example, the propagation speed of vibration is 30 m / sec.
Assuming that the vibration period of a building having a height of 70 m is 2.5 sec, which is not within the range where the conventional shear vibration absorbing bearing can be isolated at all. Therefore, the present invention provides a bearing that can be applied to a building structure or a mechanical structure having a long natural period, a dynamic vibration absorber, and the like.

[0004]

Means for Solving the Problems An intermediate flange is provided between upper and lower flanges, and a steel plate and a rubber are alternately provided between the flanges to form a laminated rubber, and a plurality of vertically extending rubbers are provided between the flanges along the outer periphery of the laminated rubber. A support mechanism or spring mechanism k _v is arranged to form a bearing. This is shown in FIG. Further, the support or the spring between the intermediate flange and the flange can be provided in a plurality of stages as shown in FIGS. 4 and 5, for example. As a supporting mechanism, the outer peripheral point of the upper flange, the inner peripheral point of the outer rubber, that is, the outer peripheral point of the laminated rubber, and the outer peripheral point of the intermediate rubber, that is, the outer peripheral point of the laminated rubber, and two points near the outer periphery of the flange are located. A pulley may be provided, and a continuous bracing structure using a wire may be used, in which a wire rope is tensioned with a turnbuckle at the two stop points crosswise via the pulley, or an ordinary helical spring may be used.

[0005]

In the conventional laminated rubber, the bending stiffness is low, so that the buckling load cannot be reduced and the axial force cannot be supported. However, in the bearing of the present invention provided with the support mechanism or the spring mechanism, the bending moment is canceled through the intermediate flange, so that the overall bending rigidity is increased and the buckling load can be prevented from lowering. FIG. 9 is a modified view of a conventional laminated rubber having a height and showing a state where buckling is about to occur. FIG. 10 is a modified view when a supporting material or a spring material for increasing bending rigidity is arranged on a laminated rubber having a height.

FIG. 6 is an enlarged view of a portion of a continuous bracing structure made of a wire as a supporting mechanism, and shows a modified example thereof. The continuous brace structure of the wire absorbs the bending deformation caused by the horizontal deformation, while the wire is integrated, so that the overall length does not change even during the horizontal deformation and there is almost no shear rigidity. If a steel wire is used in the tensile direction, it has extremely high rigidity, and the bending rigidity of the laminated rubber can be sufficiently increased. Although rigidity cannot be expected in the compression direction, there is no problem because the wire brace disposed on the opposite side has high tensile rigidity.

[0007]

FIG. 1 shows an example in which a continuous wire brace 4 is applied as a support mechanism. An intermediate flange 1 ′ is provided between the upper and lower flanges 1, and a laminated rubber 2 in which a steel plate and rubber are alternately formed between the upper flange 1 and the intermediate flange 1 ′ and between the intermediate flange 1 ′ and the lower flange 1. Eight radially toward the center of the outer periphery of the laminated rubber, the crossbuckle 3 from the outer stop 6 to the inner stop 6
The wire brace material 4 is tensioned through the pulley 5 and the pulley 5. The tension of the wire braces 4 is not limited to eight. The number of the intermediate flange 1 'is one in FIGS.
FIG. 5 shows an example of three sheets, and the number of intermediate flanges is not limited. Further, the supporting mechanism is not limited to the wire brace 4, but may be a helical spring.

FIG. 11 shows an example in which a ball bearing is used as a supporting member. In this example, four ball bearings are attached from the intermediate plate 1 ′ of the two-layer laminated rubber 2. Further, as shown in FIG. 12, the thickness of the laminated rubber does not need to be constant, and the support material or the spring material may not be included in all the stages.

[0009]

The effect of the present invention is to provide a high flexural rigidity laminated rubber bearing which imparts high flexural rigidity without sacrificing high vertical rigidity and low shear rigidity as compared with conventional laminated rubber bearings. .

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view of one intermediate flange using another spring mechanism.

FIG. 4 is a view using two intermediate flanges.

FIG. 5 is a diagram using three intermediate flanges.

FIG. 6 is a partially enlarged view showing a state in which a wire brace member is operating.

7 (a) is a top view and FIG. 7 (b) is a side view of a conventional laminated rubber bearing.

FIG. 8 is a diagram in which a bending moment M acts on a conventional laminated rubber bearing.

FIG. 9 is a diagram in which an axial force and a horizontal force act on a conventional laminated rubber bearing.

FIG. 10 is a diagram in which an axial force and a horizontal force act on the high bending rigidity laminated rubber bearing of the present invention.

FIG. 11A is a side view of a high flexural rigidity laminated rubber bearing using a ball bearing as a support member. (B) It is BB sectional drawing of FIG.11 (a).

FIG. 12 shows an example in which ball bearings are arranged as a support mechanism on the upper and lower stages of a three-layer laminated rubber bearing having different thicknesses.

[Explanation of symbols]

1 ... top and bottom flange, 1 '... middle flange, 2
..Laminated rubber, 3 ... Turnbuckle, 4 ... Wire brace, 5 ... Pulley, 6 ... Stop point, 7 ...
Helical spring, 8 ... ball bearing

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shunichi Yamada 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Tomohiko Arita 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Norihide Oga 1-2-7 Moto Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Katsuyasu Sasaki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima (56) References JP-A-62-101763 (JP, A) JP-A-63-184807 (JP, U) JP-A-2-11905 (JP, U) JP-A-2-77343 (JP) , U)

Claims (4)

(57) [Claims] An intermediate flange is provided between an upper flange and a lower flange. A steel plate and a rubber are alternately provided between the flanges to form a laminated rubber, and a point on the outer periphery of the intermediate flange and an outer periphery of the laminated rubber located inside the intermediate flange are provided. A pulley is provided at the point, and a brace structure in which the wire rope is cross-tensioned via a turnbuckle with the outer peripheral point of the upper flange and the outer peripheral point of the laminated rubber positioned inside as a stop point is provided on the laminated rubber. A high flexural rigidity laminated rubber bearing, wherein a plurality of radially provided, a brace structure similar to that between the upper flange and the intermediate flange is provided between the intermediate flange and the lower flange. 2. An intermediate flange is provided between an upper flange and a lower flange. A steel plate and a rubber are alternately provided between the flanges to form a laminated rubber, and the upper flange and the intermediate flange on the outer periphery of the laminated rubber, and the intermediate flange and the lower side. A high flexural rigidity laminated rubber bearing comprising a plurality of helical springs disposed between flanges. 3. An intermediate flange is provided between the upper flange and the lower flange. A steel plate and a rubber are alternately provided between the flanges to form a laminated rubber, and the upper flange and the intermediate flange on the outer periphery of the laminated rubber, and the intermediate flange and the lower side. A high flexural rigidity laminated rubber bearing comprising a plurality of ball bearings disposed between flanges. 4. The high bending rigidity according to claim 1, 2 or 3, wherein the intermediate rubber has a structure of two or more stages in the laminated rubber bearing having high bending rigidity according to claim 1, 2 or 3. Laminated rubber bearing.