JPH07207764A - Layered rubber support having high flexural rigidity - Google Patents

Abstract

PURPOSE:To heighten flexural rigidity by arranging an intermediate flange between upper and lower flanges, forming layered rubber by mutually layering steel plates and rubbers on each other between the flanges, and arranging a spring mechanism in the vertical direction between the flanges along the outer periphery of the layered rubber. CONSTITUTION:An intermediate flange 1' is arranged between upper and lower flanges 1. Layered rubber 2 by mutually layering steel plates and rubbers on each other is arranged between the upper flange 1 and the intermediate flange 1', and the intermediate flange 1' and the lower flange 1. Plural wire brace materials 4 are tensioned through turnbuckles 3 and pulleys 5 while crossing them each other up to inner peripheral fastening points 6 from outer peripheral fastening points 6 on the outer periphery of the layered rubber 2.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Seismic isolation of building structures or floor isolation,
Support for mechanical structures, dynamic vibration absorbers, etc.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, FIG. 8 or FIG. 9, a laminated rubber having an alternating structure of a rubber layer and a steel plate has been used. However, in this structure, the bending rigidity of the rubber against the bending moment M is low, and the shear rigidity is large when the height is low compared to the bottom area, so it cannot be applied to long-period vibration, and the height of the shear is reduced in order to reduce the shear rigidity. If the value is increased, the bending rigidity is lacked, which is inconvenient.

[0003]

As described above, in a building which is relatively low in height with respect to the cross-sectional area of the building and in which the building is less likely to be bent and deformed by seismic force, the bottom area and the height of the bearing are increased. If the proportion of is properly selected, the conventional laminated rubber bearing as shown in FIG. 7 effectively absorbs vibration.
This is because the bending deformation in the axial direction of the building is small, and the building is considered as a single rigid body and behaves in shear vibration with the ground. However, when the height is higher than a certain level with respect to the cross-sectional area of a building, the behavior of vibration becomes completely different from the rigid body vibration seen in a building with a low height. A building whose height is higher than the cross-sectional area of the building behaves like a leaf spring. That is, the spring constant of flexural vibration, which is regarded as in the case of the statically indeterminate beam supported by the center freely, decreases in inverse proportion to the n-th power of the height (n> 1). Therefore, a large bending vibration is generated with a small external force. For example, the propagation speed of vibration is 30m / sec
Estimating that, the vibration period of a building with a height of 70 m is 2.5 sec, which is far below the range where conventional shear vibration absorption bearings can be isolated. Therefore, the present invention provides a bearing that can be applied to a building structure, a mechanical structure, a dynamic vibration absorber, or the like, which has a long natural period.

[0004]

[Means for Solving the Problems] An intermediate flange is provided between upper and lower flanges to form a laminated rubber by alternately laminating a steel plate and rubber between the flanges, and a plurality of vertically extending rubbers are provided along the outer periphery of the laminated rubber between the flanges. A support mechanism or spring mechanism k _v is arranged to form the bearing. This state is shown in FIG. Further, the intermediate flange and the support or spring between the flanges may have a plurality of stages as shown in FIGS. 4 and 5, for example. As the spring means, the outer peripheral point of the upper flange and the inner side thereof, that is, the outer peripheral point of the laminated rubber as the stop point, the inner side of the lower flange,
That is, pulleys are provided at the outer peripheral point of the laminated rubber and its outer side, and at two points near the outer periphery of the flange, and the wire rope is tensioned with a turnbuckle by crossing the two stop points through the pulley. The wire may have a continuous brace structure made of wire, or may be an ordinary spiral spring.

[0005]

In the conventional laminated rubber, since the bending rigidity is low, it is not possible to prevent the buckling load from decreasing and it is impossible to support the axial force. However, in the bearing of the present invention provided with the support mechanism or the spring mechanism, since the bending moment is canceled through the intermediate flange, 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 shows a state where buckling is about to occur. FIG. 10 is a modified view of a laminated rubber having a height, in which a support agent or a spring agent for enhancing bending rigidity is arranged.

FIG. 6 is an enlarged view of a continuous brace structure portion using a wire as a spring means and shows a modification thereof. The continuous brace structure of the wire absorbs bending deformation due to horizontal deformation, while the wire is integrated, the overall length does not change during horizontal deformation and there is almost no shear rigidity. If a steel wire is used in the pulling direction, it has extremely high rigidity, and the bending rigidity of the laminated rubber can be sufficiently increased. In the compression direction, rigidity cannot be expected, but there is no problem because the wire brace arranged on the opposite side has high tensile rigidity.

[0007]

FIG. 1 shows an example in which a continuous wire brace 4 is applied as spring means. An intermediate flange 1 ′ is provided in the middle of the upper and lower flanges 1, and between the upper flange 1 and the intermediate flange 1 ′ and between the intermediate flange 1 ′ and the lower flange 1, a laminated rubber 2 in which a steel plate and rubber are laminated alternately is formed. On the outer circumference of the laminated rubber, eight wires are radiated toward the center from the outer peripheral stop point 6 to the inner peripheral stop point 6 while tensioning the wire brace member 4 via the turnbuckle 3 and the pulley 5. . The number of tensioned wire braces 4 is not limited to eight.

The number of intermediate flanges 1'is one in FIGS. 1 and 3, but is two in FIG. 4 and three in FIG. 5, and the number of intermediate flanges is not limited. Further, the spring means is not limited to the wire brace 4 and can be a spiral spring.

FIG. 11 shows an example in which a ball bearing is used as the support agent. In this example, four ball bearings are attached from the intermediate plate 1'of the laminated rubber 2 in two stages.

Further, as shown in FIG. 12, the thickness of the laminated rubber does not have to be constant, and the supporting material or the spring material may not be provided in all stages.

[0011]

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 the conventional laminated rubber bearing. .

[Brief description of 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 means.

FIG. 4 is a diagram in which two intermediate flanges are used.

FIG. 5 is a diagram in which three intermediate flanges are used.

FIG. 6 is a partially enlarged view of the wire brace member in operation.

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

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

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

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

[Explanation of symbols]

1 ... Top and bottom flange, 1 '... Intermediate flange, 2 ...
..Laminated rubber, 3 ... Turnbuckle, 4 ... Wire brace, 5 ... Pulley, 6 ... Stop point, 7 ...
Spiral spring, 8 ... Ball bearing

 ─────────────────────────────────────────────────── --- Continuation of 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 No. Kashima Construction Co., Ltd. (72) Inventor Kihide Oka 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Katsuyasu Sasaki 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd.

Claims (5)

[Claims] 1. An intermediate flange is provided between upper and lower flanges, and a steel plate and a rubber are alternately laminated between the flanges to form a laminated rubber,
A laminated rubber bearing having high bending rigidity, characterized in that a plurality of supporting mechanisms or spring mechanisms are arranged vertically between the flanges along the outer periphery of the laminated rubber. 2. The high bending rigidity laminated rubber bearing according to claim 1, wherein the intermediate flange and the supporting mechanism between the flanges or the spring mechanism have a plurality of stages. 3. The high bending rigidity laminated rubber bearing according to claim 1, wherein the spring means has a continuous brace structure formed of a wire. 4. The high bending rigidity laminated rubber bearing according to claim 1, wherein a helical spring is used as the spring means. 5. The high bending rigidity laminated rubber bearing according to claim 1 or 2, wherein a ball bearing is used as the support mechanism.