JP2000161427A - Flange incorporated base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easy removal of burr after the completion of vulcanization foamation by forming this device out of an inclined part extending the outer circumference of a rubber layer on both upper and lower ends from the outer circumference of a main body and having a wall whose axial thickness is gradually thinned toward the outer circumferential direction of a flange, and a stepped part continuous in a bent manner to the inclined part. SOLUTION: An inclination part 4 has the outer circumferential part 5 of a rubber layer 1' at both vertical ends, which is formed to be extended from the outer circumferential surface 20 of a rubber steel plate laminated body and to be gradually thinned in its thickness in the vertical direction toward the outer circumferential direction of a flange steel plate 3. A stepped part continuous to the inclination part 4 while continuous to a flange surface 16 is formed. With the constitution, shearing stress centered on the outer circumferential part 5 by the part 4 is dispersed to the whole of this device to thereby alleviate the stress concentration on the part 5. Also, the part 21 restrains rubber from fowing out to a gap in a mold at the time of vulcanization formation to thereby restrain generation of bur, and even if a bur is generated, it can be distinguished easily and it can be removed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device used as, for example, a seismic isolation material installed between a building and a foundation, a bearing material installed between a bridge girder and a pier, and the like.
More specifically, a rubber layer and a plurality of internal steel plates are laminated to form a rubber layer at the upper and lower ends. In a flange-integrated seismic isolation system having a flange attached thereto, when vibration is applied and a shear stress is applied, the outer peripheral edge of the upper and lower end rubber layers (also referred to as an adhesive rubber layer) of the mounting flange and the rubber steel sheet laminate. The present invention relates to a flange-integrated seismic isolation device that reduces stress concentration in a bonded portion with a part and disperses stress throughout the rubber steel sheet laminate.

[0002]

2. Description of the Related Art A conventional flange integrated seismic isolator is shown in FIG.
As shown in the plan view of FIG. 4A, the cross-sectional view taken along the line AA ′ of FIG. 4B, and the partial enlarged view of the circle C in FIG.
Circular, square, etc. (in this example, circular) rubber layer 1 and internal steel plate 2
Alternately and laminated so that the upper and lower ends become rubber layers,
The rubber layers 1 ′ and 1 ″ are bonded to the flange steel plate 3.
The flange steel plate 3 is made of a thick steel plate having a mounting hole 11 in a peripheral portion in order to be fixed between a building or the like to be subjected to seismic isolation and a foundation of the building by a fixing tool (bolt or the like). . It is important that the flange-integrated seismic isolator 10 withstands shear deformation in its use. In particular, stress concentration occurs on the outer peripheral portion 5 of the rubber layers 1 ′ and 1 ″ at the upper and lower ends bonded to the flange steel plate 3. In consideration of the above, as shown in a partially enlarged cross-sectional view of the outer peripheral portion 5 (C ′ in FIG. 5) in FIG. 6, the outer peripheral portion 5 is moved inward so as to gradually increase the cross-sectional area toward the flange steel plate 3. In most cases, the stress is concentrated on the outer peripheral portion 5 of the bonding to the flange by such a design.

[0003]

However, in the above-mentioned shape, the rubber layer 1 'bonded to the flange steel plate 3 is used.
The outer peripheral portion 5 becomes thinner as it comes closer to the flange steel plate 3, so that so-called burrs (unnecessary rubber portions which flow into the gaps of the mold during vulcanization and harden) tend to occur, and the rubber layer 1 It is difficult to discern the boundary between 'and the burr generated on the outer periphery, making deburring work difficult.

In view of the above, the present invention reduces the stress concentration at the outer peripheral portions of the rubber layers at the upper and lower ends of the laminate at the bonding portion with the flange during the above-mentioned shear deformation, and makes it easy to remove burrs after vulcanization molding. It is an object of the present invention to provide a flange-integrated seismic isolation device having:

[0005]

In order to solve the above-mentioned problems, a flange-integrated seismic isolator according to the first aspect of the present invention has a plurality of rubber layers and internal steel plates alternately laminated, and rubber layers at both upper and lower ends. A flange-integrated seismic isolation device in which flanges for mounting to a base are attached to upper and lower surfaces of a rubber steel sheet laminate, wherein outer peripheral portions of the rubber layers at the upper and lower ends extend from an outer peripheral surface of a main body of the rubber steel sheet laminate. A projecting portion, a cross-sectional shape of the extending portion, an inclined portion having an axial thickness gradually reduced as it reaches the outer peripheral direction of the flange, and a step which bends and continues to the inclined portion to reach the bonding surface of the flange. And the part.

[0006] The rubber steel sheet laminate reduces the transmission of shear stress due to vibration by alternately laminating a plurality of rubber layers and internal steel sheets. It can be easily installed between the base and the like. The outer peripheral portions of the rubber layers at the upper and lower ends extend outward from the outer peripheral surface of the rubber steel sheet laminate, so that the thickness of the extended portion gradually decreases in the axial direction as the shape of the extended portion reaches the outer peripheral direction of the flange. By inclining, when a shear stress is applied to the seismic isolation device, stress concentration on the outer peripheral portion of the bonding with the flange is reduced, thereby preventing damage to the bonding portion and early fatigue. Here, the term “inclination” includes not only a straight line but also a curved line such as a convex or concave arc.
Here, the axial direction represents the longitudinal direction, that is, the laminating direction of the rubber layer and the internal steel plate. Also, by providing a step of a predetermined height between the inclined surface and the adhesive surface of the flange, burrs are less likely to occur during vulcanization molding, and even if it occurs, the burrs become thinner, and the rubber The boundary between the tip of the layer and the burr becomes clear, and the deburring operation becomes easy. Here, the step refers to a difference in height between a bending point from the inclined portion and an adhesive surface of the flange (a surface in contact with the adhesive rubber layer). The seismic isolation device according to the present invention is generally provided with a coating rubber layer on the outer periphery of a rubber steel sheet laminate, but the coating rubber layer is not necessarily required.

According to a second aspect of the present invention, the stepped portion connected to the inclined portion is perpendicular to the bonding surface of the flange. That is, by forming the outer peripheral surface of the step perpendicular to the bonding surface of the flange, the effect of preventing burr generation is further increased, and the boundary between the tip portion and the burr is further clarified.

According to a third aspect of the present invention, there is provided a flange-integrated seismic isolation device, wherein a plurality of rubber layers and internal steel plates are alternately laminated, and the upper and lower ends of the rubber steel plate laminate having rubber layers are mounted on a base. A flange-integrated seismic isolation device with a flange attached thereto, wherein the outer peripheral portions of the rubber layers at the upper and lower ends extend from the outer peripheral surface of the main body of the rubber steel sheet laminate, and the cross-sectional shape of the extended portion is The flange is formed in a convex arc shape in which the thickness in the axial direction gradually decreases toward the outer peripheral direction of the flange.

When the outer peripheral portion of the rubber layer extends so as to become thinner toward the outer peripheral direction of the flange, when a shear stress is applied to the seismic isolation device, a stress applied to the bonded end portion with the flange is reduced. Reduces concentration and distributes stress throughout the device to prevent bond failure and premature fatigue. Since the shape of the vertical cross section of the outer peripheral end forms a convex arc, the angle at which the tip end and the adhesive surface of the flange are in contact with each other can be increased, the occurrence of burrs can be reduced, and the rubber layer can be formed. The boundary with the burr becomes clear, and the deburring work becomes easy. The effect is greatest when the surface at the tip of the rubber layer is perpendicular to the contact surface of the flange.

According to a fourth aspect of the present invention, there is provided a flange-integrated seismic isolation device, wherein a plurality of rubber layers and an internal steel plate are alternately laminated, and the upper and lower ends of the rubber steel plate laminated body are mounted on a base body. A flange-integrated seismic isolation device with a flange attached thereto, wherein the outer peripheral portions of the rubber layers at the upper and lower ends extend from the outer peripheral surface of the main body of the rubber steel sheet laminate, and the cross-sectional shape of the extended portion is The flange is formed of a concave arc whose thickness in the axial direction gradually decreases as it reaches the outer peripheral direction, and a convex arc extending in the outer peripheral direction at a position where the concave arc becomes horizontal.

The cross section of the outer peripheral portion is formed into a concave arc whose thickness in the axial direction becomes thinner as it reaches the outer peripheral direction of the flange, and disperses shear stress acting on the outer peripheral portion of the adhesive with the flange to disperse the shear stress. Prevent breakage and premature fatigue. Further, the concave arc is connected to a position where it is substantially horizontal, and is formed into a convex arc in the outer peripheral direction, and the outer peripheral end of the convex arc is made substantially perpendicular to the bonding surface of the flange, so that the vulcanization molding is performed. The burr generation is suppressed, and the boundary between the tip and the burr is easily distinguished to facilitate the deburring operation.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a flange-integrated seismic isolation device according to the present invention will be described with reference to the drawings. FIG. 4A used for explaining the conventional example is a plan view, FIG. 4B is a cross-sectional view taken along the line AA ′, and FIG.
(b) is a partially enlarged view of a circle C (the outer peripheral end portion 5 shows a conventional example).

[0013] The flange integrated type seismic isolation device 10 of the present embodiment.
The rubber layer 1 mainly composed of natural rubber and the internal steel plate 2 previously bonded (roughened, coated with an adhesive) are alternately laminated in a plurality of layers, and the upper and lower ends are rubber layers 1 ', 1 ". Flange steel plates 3 and 3 ′ for mounting on a base or the like are attached to the upper and lower surfaces of a rubber steel plate laminate 17 (see FIG. 5), and are vulcanized and integrated.

As shown in FIG. 1, the outer peripheral portions 5 of the rubber layers 1 'at both the upper and lower ends of the laminate extend from the outer peripheral surface 20 of the rubber steel plate laminate 17 (FIG. 5) and have a cross section of the flange steel plate 3. The inclined portion 4 is formed so that the thickness in the up-down direction (axial direction) becomes gradually smaller toward the outer peripheral direction (direction of the arrow x). The inclined portion 4 is usually formed into a concave arc as shown in FIG. 1, and the shear stress intensively acting on the outer peripheral portion 5 is dispersed throughout the entire device of the seismic isolation device by this shape. Is alleviated. In addition, a step (part) 21 bent and connected to the inclined portion 4 and connected to the flange surface 16.
By forming the rubber, the rubber flows out into the gap of the mold at the time of vulcanization molding to suppress the generation of burrs, and even if burrs are generated, they can be easily identified and the burrs can be easily removed. The step 21 refers to a sharp difference in height between the tip portion 15 of the inclined portion 4 and the bonding surface 16 of the flange steel plate 3, and the thickness is determined by the fluidity during vulcanization of rubber and the metallization. Although it is affected by mold accuracy and the like, it is usually 2 to 12 mm. If the surface is formed so as to be perpendicular to the bonding surface 16 of the flanged steel plate 3, burrs can be reduced, and even if it is generated temporarily. Also makes it easier to remove burrs.

In another embodiment of the present invention, as shown in a cross section in FIG. 2, the extending portion (outer peripheral portion) 5 of the rubber layer 1 ′ is extended in the axial direction as the outer peripheral direction of the flange steel plate 3 (arrow x). And the outer surface side (inclined portion) 4 forms a convex arc. As a result, the shear stress applied to the seismic isolation device is dispersed throughout the device, stress concentration on the outer peripheral portion 5 is reduced, and the tip 1
5 is in contact with the flange steel plate 3 at an angle of about 90 °,
As in the above-described embodiment, the generation of burrs is suppressed, and even if they do, burrs can be easily removed.

Further, in another embodiment, as shown in FIG. 3, as the cross-sectional shape of the extending portion 5 extending from the rubber steel sheet laminate extends in the outer peripheral direction of the flange steel sheet 3 (in the direction of arrow x), the axial direction is increased. A concave arc 18 where the wall thickness becomes thinner and an outwardly convex arc continuous with a position where the concave arc 18 becomes horizontal are formed perpendicular to the adhesive surface 16 of the flange. Since the stepped portion 19 forming a convex arc is provided continuously to the inclined portion 4 forming a concave arc, there is no sharp bend point, and when a shear stress is applied to the seismic isolation device, a more gentle stress concentration occurs. Are alleviated and dispersed, burrs are prevented from being generated, and burrs are easily removed.

[0017]

As is apparent from the above description,
The flange-integrated seismic isolation device according to the present invention is configured such that the outer peripheral flange sides of the rubber layers at the upper and lower ends are gradually thinned in the axial direction as they go outward, and a step is provided at the tip end thereof. When a shear stress is applied to the device, it is possible to prevent the stress from being concentrated between the outer peripheral portions of the rubber layers at the upper and lower ends and the flange, thereby suppressing the generation of burrs, and clearly defining the boundary between the burrs and the molded product. Thus, it is easy to distinguish and it is easy to remove burrs.

In addition to the above effects, in the seismic isolation device according to the second aspect, by forming the outer peripheral surface of the step perpendicular to the adhesive surface of the flange, the effect of preventing burr generation is further increased, and This has the effect that the boundary between the burr and the burr becomes clearer.

According to the third aspect of the present invention, the flange-integrated seismic isolation device can reduce the occurrence of burrs, clarify the boundary between the rubber layer and the burrs, facilitate the deburring operation, and reduce the amount of burrs. When the surface is perpendicular to the contact surface of the flange, there is an effect that the effect is maximized.

According to the fourth aspect of the present invention, the flange-isolated seismic isolation device disperses shear stress acting on the outer peripheral portion to prevent breakage and early fatigue of the outer peripheral bonded portion, and furthermore, to prevent generation of burrs during vulcanization molding. Thus, there is an effect that the boundary between the tip and the burr can be easily distinguished and the deburring operation is facilitated.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view showing an extension of a flange-integrated seismic isolation device according to an embodiment of the present invention.

[0021]

FIG. 2 is a partially enlarged cross-sectional view showing an extension portion of a flange-integrated seismic isolation device according to another embodiment of the present invention.

[0022]

FIG. 3 is a partially enlarged cross-sectional view showing an extension of an adhesive rubber layer of a flange-integrated seismic isolation device according to another embodiment of the present invention.

[0023]

FIG. 4 shows a general flange integrated type seismic isolation device.
4A is a plan view, and FIG. 4B is a cross-sectional view taken along line AA ′ of FIG. 4A.

[0024]

FIG. 5 (b) circle C of the conventional flange integrated seismic isolation device
The enlarged view of FIG.

[0025]

FIG. 6 is a partially enlarged cross-sectional view showing an extension of a conventional flange-integrated seismic isolation device.

[0026]

[Explanation of symbols]

 1.1 ′: Rubber layer 2: Internal steel plate 3: Flange steel plate 4: Inclined portion (outer surface side) 5: Peripheral portion (extended portion) 10: Flange integrated seismic isolation device 15: Tip portion 17: Rubber steel plate laminate 19:21: Step (part) 20: Outer peripheral surface of rubber steel sheet laminate

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3J048 AA01 BA08 BA18 DA03 EA38 3J059 AB13 AD05 BA43 BB01 BC06 BD01 BD05 BD09 CB09 EA06 EA13 GA42 4F100 AB03A AB03B AN00C BA03 BA05 BA08 BA10A BA10C DB09A DB16C EK00 GB07 J07

Claims (4)

[Claims] 1. A flange-integrated seismic isolation device in which a plurality of rubber layers and internal steel plates are alternately laminated, and a flange for mounting to a base is attached to upper and lower surfaces of a rubber steel plate laminate having upper and lower ends as rubber layers. A device, wherein the outer peripheral portions of the rubber layers at the upper and lower ends extend from the outer peripheral surface of the main body of the rubber steel sheet laminate, and the cross-sectional shape of the extended portion is changed in the axial direction as the outer peripheral direction of the flange is reached. A flange integrated seismic isolation device, comprising: an inclined portion whose thickness is gradually reduced; and a step portion which is bent and connected to the inclined portion and reaches a bonding surface of the flange. 2. The seismic isolation device with integral flange according to claim 1, wherein a step portion connected to the inclined portion is perpendicular to an adhesive surface of the flange. 3. A flange-integrated seismic isolation device in which a plurality of rubber layers and internal steel plates are alternately laminated and a flange for mounting to a base is attached to the upper and lower surfaces of a rubber steel plate laminate having upper and lower ends as rubber layers. A device, wherein the outer peripheral portions of the rubber layers at the upper and lower ends extend from the outer peripheral surface of the main body of the rubber steel sheet laminate, and the cross-sectional shape of the extended portion is changed in the axial direction as the outer peripheral direction of the flange is reached. A flange-integrated seismic isolation device characterized by a convex arc whose thickness is gradually reduced. 4. A flange-integrated seismic isolation device in which a plurality of rubber layers and internal steel plates are alternately laminated, and a flange for mounting to a base is attached to upper and lower surfaces of a rubber steel plate laminate having upper and lower ends as rubber layers. An apparatus, wherein the outer peripheral portions of the rubber layers at both the upper and lower ends extend from the outer peripheral surface of the main body of the rubber steel sheet laminate, and the cross-sectional shape of the extended portion extends in the axial direction as it reaches the outer peripheral direction of the flange. A flange-integrated seismic isolator characterized by a concave arc whose wall thickness gradually decreases, and a convex arc extending in the outer peripheral direction and connected to a position where the concave arc becomes horizontal.