JP2001140977A - Base isolation support body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation support body capable of being easily deformed on the end abutting on a flange when high shear deformation is applied, to be easily applied with pressure required for bonding a laminated body and the flange in molding, and having high adhesive force, by forming s shock absorbing part having the width size gradually increased from the central part to the wide part between the central part and the wide part of the laminated body. SOLUTION: In a base isolation support body, flanges 5 are provided on the upper and lower surfaces of a laminated body 3 formed by alternatively laminating and bonding rigid hard plates 2 and Visco-elastic soft plates 1 in the vertical direction. Wide parts 16 having the size larger than the width size of the central part 16 of the laminated body 3 are respectively formed on the upper and lower ends of the laminated body 3, shock absorbing part 18 having the width size gradually increased from the central part 15 to the wide part 16 is formed between the central part 15 and the wide part 16 of the laminated body 3, and approximately vertical surfaces 17 in the flange direction are formed on the outer surfaces of respective wide parts 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid plate having rigidity and a viscoelastic soft plate which are laminated and bonded to each other. The present invention relates to a seismic isolation bearing that absorbs vibration energy during an earthquake.

[0002]

2. Description of the Related Art Conventionally, seismic isolation bearings (also referred to as laminated rubber) have been proposed in which a plurality of hard plates and soft plates having viscoelastic properties are alternately bonded. Such a seismic isolation bearing is disposed between a road bridge or a building and a base, and acts to shift the natural period of the road bridge or the building from the period of the earthquake. The acceleration becomes smaller.

[0003] A seismic isolation bearing is usually formed by firmly bonding a thick steel plate called a flange to portions of upper and lower surfaces of a laminate composed of a soft plate and a hard plate, which are in contact with a building and a foundation.

In such seismic isolation bearings, there are a type in which a flange is fastened to the upper and lower surfaces of the laminate after the laminate is molded, and a type in which the flange is bonded to the laminate simultaneously with the molding of the laminate. There is, however, the latter monolithic type has the merit of cost, so most of them are currently occupied by this type.

In the integral type seismic isolation bearing, at the portion where the flange and the laminate contact each other, the laminate 33 is arranged such that the outer surface of the laminate 33 is perpendicular to the flange 35 as shown in FIG. For example, as shown in FIG. 10 (described in Japanese Patent Publication No. 7-84814), the laminated body 33 is laminated so that the outer surface of the laminated body 33 is curved with respect to the flange 35 as shown in FIG. Some have the body 33 adhered to the flange 35.

[0006] In the former seismic isolation bearing, a laminate 33 is used.
The pressure required for bonding the laminated body 33 and the flange 35 is likely to be applied during the molding of the rubber. However, when the shear-isolated bearing body receives high shear deformation, the end of the rubber in contact with the flange 35 is hardly deformed. There is a disadvantage that it is easily peeled off.

As shown in FIG. 11, the latter seismic isolation bearing is easily deformed because the curved portion 31 is formed at the flange-side end of the laminated body 33. Therefore, the former seismic isolation bearing is used. It is said to withstand shear deformation. However, since the portion in contact with the flange 35 has an R-shape, when forming the seismic isolation bearing, pressure required for bonding the curved portion 31 to the flange 35 is less likely to be applied. From the resin.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide an end portion which is in contact with a flange even under high shear deformation. An object of the present invention is to provide a seismic isolation bearing which is easily deformed and hardly peeled off, and is easily applied with pressure required for bonding a laminate and a flange at the time of molding and has high adhesive strength.

Another object of the present invention is to provide a seismic isolation bearing which can increase the adhesive force by forming a concave groove in the flange and further increasing the bonding surface between the laminate and the flange. is there.

[0010]

The seismic isolation bearing of the present invention is:
A rigid base plate having rigidity, a soft plate having viscoelasticity, and a seismic isolation bearing in which flanges are provided on upper and lower surfaces of a laminate formed by alternately laminating and bonding a plurality of laminates in the vertical direction. At the upper and lower ends, wide portions each having a size larger than the width of the central portion of the laminate are formed, and between the central portion and the wide portion of the laminate, the width is changed from the center to the wide portion. Buffer portions gradually widened toward the flange are formed, and an outer surface of each wide portion is formed with a substantially vertical surface facing the flange direction, thereby achieving the above object.

In one embodiment, a concave groove is formed on a surface of the flange in contact with the laminate, and the concave groove is located in a vertical direction on an outer surface of a central portion of the laminate.

Preferably, a tapered surface or a curved surface is formed on the outer surface of the buffer.

The operation of the present invention is as follows.

At the upper and lower ends of the laminate, wide portions having a width larger than the width of the central portion of the laminate are formed, and the width between the central portion and the wide portion of the laminate is increased from the central portion. By forming the buffer portion that gradually widens toward the wide portion, the buffer portion and the wide portion can suppress the occurrence of local distortion of the laminate near the flange and withstand shear deformation.

Further, since a substantially vertical surface is formed in the outer surface of each wide portion of the laminated body toward the flange direction, the pressure at the time of forming the seismic isolation bearing rises vertically from the flange and the flange. It works effectively between the adhesive surface of the wide portion and the adhesive force of the both.

In particular, since the concave groove is formed on the surface of the flange in contact with the laminate, the bonding area between the flange and the laminate can be increased, and the pressure during molding can be effectively reduced. Can act between

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a seismic isolation bearing A according to an embodiment of the present invention.

The seismic isolation bearing A has a laminated body 3 formed by alternately laminating a plurality of soft plates 1 having viscoelastic properties and hard plates 2 having rigidity such as a steel plate in the vertical direction. ,
And a flange 5 bonded to upper and lower surfaces of the laminate.

The thickness of the hard plate 2 is preferably 1 to 6 mm, and the thickness of the soft plate 1 is preferably 1 to 50 mm. A coating layer 4 made of natural rubber or the like is formed on the outer periphery (upper and lower surfaces and side surfaces) of the laminate 3. The thickness of the coating layer 4 is usually 1 to 30 mm. The flanges 5 and 5 are integrally laminated and bonded to the soft plate 1.

The planar shape of the flange 5 may be rectangular,
Alternatively, the shape may be circular or elliptical. Laminated body 3 of flange 5
A concave groove 10 is formed on the side surface along the periphery. As shown in FIG. 2, the concave groove 10 has a trapezoidal cross section, and has a bottom surface and an inclined surface. The position of the groove 10 is set such that an extension of the outer surface of the central portion 15 of the seismic isolation bearing is located in the groove 10. A ridge portion 11 is provided on the flange 5 at a position further outside the concave groove 10, and a peripheral portion 12 which is one step lower than the ridge portion 11 is formed further outside the ridge portion 11.

As shown in FIG. 1, at the upper and lower ends of the laminate 3, wide portions 16 which are larger than the width of the central portion 15 of the laminate 3 are formed. Between the central portion 15 and the wide portion 16 is formed a buffer portion 18 whose width dimension gradually increases from the central portion 15 to the wide portion 16.

The width of the wide portion 16 is preferably 2 to 25 mm with respect to the width of the central portion 15. Also, the vertical height of the wide portion 16 is 2 to 30 with respect to the vertical height of the entire laminate 3.
mm is preferred.

The outer surface of the buffer 18 may be formed with a tapered surface or a curved surface. The vertical height of the buffer 18 is preferably 4 to 55 mm with respect to the height of the laminate 3. When a curved surface is formed on the outer surface of the buffer portion 18, the radius of curvature R of the cross section is preferably 1 to 25 mm. A substantially vertical surface 17 is formed on the outer surface of each wide portion 16 in the direction of the flange 5. That is, the wide portion 1
The outer surface 6 and the outer surface of the central portion 15 of the laminate 3 are substantially parallel surfaces.

In the embodiment shown in FIGS. 1 and 2, the buffer portion 18 of the laminate 3 is located above the groove 10 as described above.
Is located near the ridge portion 11 and the wide portion 16 of the laminate 3
Are formed. The distal end of the wide portion 16 is almost in contact with the peripheral portion of the flange 5.

Next, an example of a method of manufacturing the seismic isolation bearing A having the above configuration will be described.

As shown in FIG. 3, a lower mold 21, an upper mold 22,
A pair of upper and lower flanges 5, a soft plate 1, a hard plate 2, and a rubber material constituting a coating layer 4, which constitute a laminated body 3, are arranged in a mold 24 comprising a cylindrical middle mold 23. Apply pressure. The rubber material is vulcanized by heating during molding, and the rubber material forming the laminate 3 is pressed against the flange 5 surface by pressure during molding. Here, the laminated body 3 is formed with the wide portion 16 having the vertical surface 17 on the outer surface, so that the laminated body 3
And the adhesive strength of the laminate 3 to the flange 5 is improved. Further, since the concave groove 10 is formed in the flange 5 as described above, the bonding area of the laminate 3 with the rubber material is improved, and the ridge portion 11 is formed.
Will give the necessary pressure to adhere to the surface. Furthermore, since the groove 10 is provided, the adhesive that starts moving together with the flow of rubber from the inside can be dammed, and a more stable adhesive force can be obtained.

In the formation of the seismic isolation bearing A,
The rubber material of the soft plate 1 and the rubber material of the coating layer 4 may be simultaneously vulcanized and bonded. After the rubber material of the soft plate 1 is vulcanized, the rubber material of the coating layer 4 is vulcanized and bonded. May be.

FIG. 4 and FIG. 5 show another embodiment.

On the surface of the flange 5 on the side of the laminate 3, a protruding step 27 is formed at the center in the width direction, and a tapered portion 28 is formed around the protruding step 27.
A peripheral portion 29 is formed around the periphery.

The upper and lower flanges 5, 5 are provided between the upper and lower ends of the laminate 3 with a cushioning portion 1 having a curved surface.
8 and a wide portion 16 are formed. The vertical surface 17 of the wide portion 16 is arranged on the peripheral portion 29 of the flange 5.

In this embodiment, the width (or outer diameter) of the hard plate 2 is Di, and the width (or outer diameter) of the step 27 is
Is d, the width (or outer diameter) of the wide portion 16 is D, and the wide portion 1 is
Assuming that the height of 6 is T and the distance between the hard plate 2 on the endmost side and the surface of the upper step 27 of the flange 5 is te, it is preferable to satisfy the following conditions in order to withstand high shear deformation.

T: 0.1te ≦ T ≦ 4te d: 0.8Di ≦ d ≦ 1.4Di D: Di <D ≦ 2.0Did <D Further, the buffer portions 18 formed at both ends of the laminate 3 The shape and size of the wide portion 16 can be variously changed. For example, as shown in FIGS. 6A to 6F, the outer surface shape of the wide portion 16 is slightly inclined or curved with respect to the surface of the flange 5. May be.

The cross-sectional shape and size of the concave groove 10 formed on the upper surface of the flange 5 can be variously changed, and the flange 5 having the upper step portion 27, the tapered portion 28, and the peripheral portion 29 described above has the same structure as that of FIG. As shown in (a) to (o), a slightly curved surface may be formed on the outer surface of the tapered portion 28.

FIG. 8 shows still another embodiment. The outer diameter, thickness, and material of the hard plate 2 formed of a steel plate or the like may be sequentially changed from the central portion 15 of the laminate 3 to the flange 5 side. For example, as shown in FIG. 8, the outer diameter of the hard plate 2 is gradually increased toward the flange 5 side, or
May be sequentially increased and the rigidity may be increased.

[0036]

According to the present invention, the buffer portion and the wide portion formed on the flange side of the laminate can cope with high shear deformation, reduce the occurrence of local distortion, and reduce damage and breakage due to local distortion. Since the shape is easily reduced and the pressure is easily applied to the flange from the rubber material constituting the laminate, it is possible to have a high adhesive force between the laminate and the flange, and the flange of the laminate is formed. It is possible to prevent the side end from peeling off.

In particular, when a concave groove is formed in the flange, the adhesive force between the rubber material of the laminate and the flange can be increased, and a structure can be provided which can withstand more shear deformation.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a seismic isolation bearing according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the seismic isolation bearing shown in FIG.

FIG. 3 is a sectional view showing a method of manufacturing the seismic isolation bearing shown in FIG.

FIG. 4 is a sectional view of another embodiment of the seismic isolation bearing of the present invention.

5 is an explanatory view of a main part of the seismic isolation bearing shown in FIG. 4;

FIG. 6 is a main part schematic diagram showing various modified examples of the outer shape of the laminate.

FIG. 7 is a main part schematic diagram showing various modifications of the upper surface of the flange.

FIG. 8 is a schematic diagram of a main part of still another embodiment of the seismic isolation bearing of the present invention.

FIG. 9 is a sectional view of a conventional seismic isolation bearing.

FIG. 10 is a sectional view of another conventional seismic isolation bearing.

11 is a diagram showing a problem of the seismic isolation bearing shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Soft board 2 Hard board 3 Laminated body 4 Coating layer 5 Flange 10 Concave groove 15 Central part 16 Wide part 18 Buffer part A Seismic isolation support

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hirofumi Tsujimoto 172 Ikezawa-cho, Yamatokoriyama-shi, Nara Prefecture Nita Factory N-term F-term (reference) 3J048 AC01 AD05 BA08 BD05 DA01 EA38

Claims (2)

[Claims] 1. A seismic isolation bearing in which flanges are provided on upper and lower surfaces of a laminated body formed by alternately laminating a plurality of rigid plates having rigidity and soft plates having viscoelasticity in a vertical direction. At the upper and lower ends of the laminate, wide portions having a width larger than the width of the central portion of the laminate are respectively formed, and the width dimension is centered between the central portion and the wide portion of the laminate. A seismic isolation bearing body in which a buffer portion gradually widened from a portion to a wide portion is formed, and an outer surface of each wide portion has a substantially vertical surface facing a flange direction. 2. The seismic isolation bearing according to claim 1, wherein a concave groove is formed on a surface of the flange that is in contact with the laminated body, and the concave groove is located in a vertical direction on an outer surface of a central portion of the laminated body. body.