JP2007113649A - Laminated rubber for base isolation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an end of a covering rubber from inconvenient adhesion peeling peeled from a flange plate by improving the structure of a part where the covering rubber and flange plate are brought into contact with each other, and to eliminate generation of an defective product accordingly. <P>SOLUTION: In a laminated rubber for base isolation in which the covering rubber 4 for covering the whole outer periphery of a laminated body 3 alternately laminating a plurality of elastic rubber layers 2 and rigid plates 1 is arranged and the flange plates 5 and 6 are bonded and fixed on both ends of the laminated body 3 in a laminated direction, an end 4A come into contact with the flange plates 5 and 6 in the covering rubber 4 is formed on an enlarged end section where its diameter is increased toward the flange plates 5 and 6 in a laminated direction. An end 4a at an outer diameter side of the enlarged end section 4A is bonded by fitting it into a circular concave filling groove 7 formed in the flange plates 5 and 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic isolation laminated rubber, and more specifically, a covering rubber that covers the entire outer periphery of a laminate in which a plurality of elastic rubber layers and rigid plates are alternately laminated is provided. The present invention relates to a seismic isolation laminated rubber in which flange plates are bonded and fixed to both ends in the direction.

  As this type of laminated rubber for seismic isolation, conventionally, among the rubber covering the entire area of the laminated body, there is one that is formed such that the end portion in contact with the flange plate gradually increases in cross-sectional area as it approaches the flange plate, For example, those disclosed in Patent Document 1 and Patent Document 2 are known.

  The thing of patent document 1 makes it possible to prevent deterioration of a metal rigid board by providing the covering rubber which covers the whole of a plurality of elastic rubber layers and a rigid board. The end portion of the covering rubber that contacts the flange plate is formed in a curved surface in which the cross-sectional shape in the laminating direction warps an arc shape that is concave toward the inner diameter direction or an arc-like shape.

  In Patent Document 2, similarly, in order to prevent the deterioration of the metal rigid plate, a covering rubber covering the entirety of the plurality of elastic rubber layers and the rigid plate is provided, and an end portion in contact with the flange plate is provided. Is formed in a shape in which the curved surface in which the cross-sectional shape in the stacking direction is concave toward the inner diameter direction or a curved surface that warps the arc-like shape is continuous in two steps.

In these conventional techniques, extremely large stresses such as tension on one side and compression on the other side are concentrated on both ends of the coated rubber that is located at both ends of the laminated body and in contact with the flange plate. This was a measure taken to solve the problem that the desired durability life could not be obtained due to damage or breakage of the laminated rubber due to peeling of the adhesion between the body and each flange plate. That is, by gradually increasing the diameter of the end of the covering rubber, the area of adhesion with the flange plate is increased while avoiding stress concentration, and the adhesion strength between the covering rubber and the flange plate is improved.
JP 2005-147220 A JP 2002-147527 A

  However, even with the laminated rubber for which the measures as described in Patent Documents 1 and 2 are taken, in some cases, “peeling” may still occur from the bonded portion between the covering rubber and the flange plate. That is, as shown in FIG. 6, the adhesive rubber 4 is easily peeled off from the outer diameter side end portion 4 a in contact with the outer peripheral flange portion 5 </ b> B of the flange plate 5, and an increase in man-hours due to rework is recognized as a new problem. It has come.

  The object of the present invention is to review the structure of the portion where the covering rubber and the flange plate are in contact with each other, thereby preventing the problem of "adhesion peeling" in which the end of the covering rubber is peeled off from the flange plate and eliminating the occurrence of defective products. It is in.

The invention according to claim 1 is provided with a covering rubber 4 that covers the entire outer periphery of a laminate 3 in which a plurality of elastic rubber layers 2 and rigid plates 1 are alternately laminated, and the lamination direction of the laminate 3 In the seismic isolation laminated rubber with the flange plates 5 and 6 bonded and fixed to both ends,
An end portion 4A of the covering rubber 4 that contacts the flange plates 5 and 6 is formed at an end portion that is widened toward the flange plates 5 and 6 in the laminating direction, and the tip portion expands. The outer diameter side end 4a of the shaped end 4A is fitted into an annular recessed groove 7 formed in the flange plates 5 and 6, and is bonded thereto.

  The invention according to claim 2 is the laminated rubber for seismic isolation according to claim 1, wherein the annular recessed groove 7 is formed to have a flat rectangular shape whose cross-sectional shape is thin in the stacking direction. It is characterized by this.

  According to a third aspect of the present invention, in the seismic isolation laminated rubber according to the first or second aspect, the outer surface of the flared end 4A has a cross-sectional shape in the laminating direction directed toward the inner diameter direction. The curved surface R that is in a state of warping the concave arc shape or the arc-like shape, or the curved surfaces R, R2 are continuously formed in two stages.

  According to a fourth aspect of the present invention, in the seismic isolation laminated rubber according to any one of the first to third aspects, the flange plates 5 and 6 have their central flange portions 5A and 6A raised toward the laminated body. Steps 5C and 6C to be formed are formed, and the outer diameter side end 4a of the pointed end 4A extends from the surfaces 8 and 9 of the flange plates 5 and 6 on the outer diameter side of the steps 5C and 6C. Is formed at the stepped rubber end portion that is the same as or substantially the same as the step h of the stepped portions 5C, 6C.

  The invention according to claim 5 is the laminated rubber for seismic isolation according to claim 4, wherein the inner vertical wall portion 7b along the lamination direction at the inner diameter side end of the annular recessed groove 7 and the step portions 5C, 6C. The annular recessed groove 7 and the stepped portions 5C and 6C are in the radial direction so that the outer vertical wall portions 12 and 13 along the stacking direction at the outer diameter side end of the outer circumferential wall are a single peripheral surface that is continuous with each other. It is characterized by being formed next to each other.

  According to the invention of claim 1, although described in detail in the embodiment, when the covering rubber is pressed against the flange plate and bonded together, the adhesive stays in the annular recess groove to ensure that the outer diameter side end portion and Since the recessed groove is bonded, the necessary and sufficient amount of adhesive is secured, the outer diameter side end and the annular recessed groove are firmly bonded, and the pointed end is separated from the flange plate. It is possible to eliminate the possibility of peeling. As a result, by reviewing the structure of the part where the covering rubber and the flange plate are in contact with each other, the outer end of the covering rubber, which is the location where the end of the covering rubber starts to peel off from the flange plate, becomes an annular shape. The concave groove, that is, the flange plate is firmly bonded by a sufficient amount of adhesive, and the peeling strength is greatly improved compared to the conventional structure, so that the end of the coated rubber and the flange plate are peeled off. It is possible to provide a laminated rubber for seismic isolation that can prevent the occurrence of defective products.

  According to the invention of claim 2, since the cross-sectional shape of the annular recessed groove is a flat rectangle, the lower part of the outer peripheral wall of the outer diameter side end and the outer peripheral wall of the annular recessed groove are adhered and peeled off. Since it acts as an adhesive surface that resists the force in the shear direction relative to the direction, it is larger than when acting in the direction of peeling the surface (adhesion between the bottom surface of the outer diameter side end and the bottom surface of the annular recess groove) Detachment strength can be demonstrated. Moreover, since it is a flat annular recessed groove, there is also an advantage that the digging depth is shallow and it can be easily formed by inexpensive processing means such as cutting. As a result, it is possible to provide a seismic isolation laminated rubber in which the operational effects of the invention of claim 1 are enhanced while making the workability of the annular recessed groove excellent.

  According to the invention of claim 3, when the outer surface of the flared end portion is a curved surface warped in a longitudinal cross-section arc shape or an arc-like shape toward the inner diameter direction, the curved surface due to large deformation During bending deformation, cracks and cracks at the edge of the coated rubber are the largest cause of damage and breakage of the coated rubber even when repeatedly deformed. Can be prevented, and the seismic isolation performance and durability life of the entire laminated rubber can be improved. In addition, when the curved surface is continuously formed in a two-stage shape, it is bent in such a manner that the connection top portion of the two-stage curved surface with the largest coating thickness is located at the deepest part during large deformation. The generation of deep wrinkles is completely eliminated. Therefore, there is an advantage that the endurance life of the entire base rubber for seismic isolation can be further improved by reliably preventing cracks and cracks at the end of the coated rubber.

  According to the invention of claim 4, the pointed end of the covering rubber functions as a cushion (cushion) region against deformation of the entire laminated rubber, and at the location where each flange plate and the covering rubber are bonded during large deformation. It is possible to reduce the concentration of stress, and it is possible to suppress or avoid adhesion peeling, and it is possible to obtain an advantage that it is possible to prevent the occurrence of damage due to the peeling.

  According to the invention of claim 5, it is possible to improve the production efficiency and reduce the cost by reducing the processing steps as compared with the case where the inner vertical wall portion and the outer vertical wall portion are formed separately, and in the direction of adhesion peeling. On the other hand, an adhesive layer having a large area in the shearing direction is formed, and there is an advantage that an adhesive structure stronger against peeling is obtained.

  Embodiments of the seismic isolation laminated rubber according to the present invention will be described below with reference to the drawings. FIG. 1 is a judgment plane view of the seismic isolation laminated rubber as a whole, FIG. 2 is an enlarged cross-sectional view showing the end of the coated rubber, FIG. 3 is an enlarged cross-sectional view showing the end of the coated rubber during shear deformation, These are sectional drawings which show another structure of the edge part of a covering rubber, respectively.

[Example 1]
FIG. 1 shows a cross-sectional structure of the entire seismic isolation laminated rubber according to the present invention. This seismic isolation laminated rubber C basically comprises a plurality of rigid plates 1 such as thin steel plates and elastic rubber layers 2 alternately. The entire area of the outer peripheral portion of the laminated body 3 is covered with a cylindrical covering rubber 4 having excellent weather resistance and corrosion resistance, and at both ends in the stacking direction of the laminated body 3, that is, both upper and lower ends. The flange plates 5 and 6 for attachment to the upper structure A such as a building and the lower structure B such as a building foundation are integrally bonded and fixed when rubber is vulcanized.

  Here, as the elastic rubber layer 2 constituting the laminate 3, a natural rubber-based rubber material or a high damping rubber material is used, and as the covering rubber 4, natural rubber (NR), SBR, IR, CR, EPDM, etc. A rubber material having excellent weather resistance and chemical resistance is used. Further, as the rigid plate 1, a hard plastic plate may be used in addition to a metal plate such as a steel plate, an iron plate, an aluminum plate, a copper plate, or a SUS plate. Furthermore, the laminated rubber C for seismic isolation is preferably a columnar shape so as to be able to cope with any horizontal swing, but may be a polygonal shape such as a quadrangle or a pentagon.

  In the seismic isolation laminated rubber C having the basic structure as described above, as shown in FIG. 2, the flange plates 5 and 6 have thick central flange portions 5A and 5B that are raised toward the laminated body. 6A and outer flange portions 5B and 6B having a smaller thickness than these, and a flat rectangular shape having a thin cross-sectional shape in the vertical direction (stacking direction) at the inner diameter side end of the outer flange portions 5B and 6B. An annular recess groove 7 is formed. The annular recessed groove 7 is formed relatively easily and inexpensively by cutting, but may be formed by other processing means such as casting or forging.

  The thickness of the central flange portions 5A and 6A is set to be thicker than the thickness of the outer peripheral flange portions 5B and 6B by a thickness h1 (normally h1 = 3 mm, but 3 mm or more is also possible). Further, the depth of the outer peripheral flange portions 5B and 6B of the annular recessed groove 7 from the inwardly outer surfaces 8 and 9 is set to h2 (h2 = 2 mm). As a result, the bottom surface 7a of the annular recessed groove 7 and Steps 5C and 6C with the upper surfaces 10 and 11 of the center flange portions 5A and 6A are set to a height h1 + h2 (= 5 mm or more).

  As shown in FIG. 2, both ends of the cylindrical covering rubber 4 in the stacking direction are formed at the end portions 4 </ b> A that are widened toward the flange plates 5 and 6 in the vertical direction (stacking direction). Yes. More specifically, the outer surface of the tip-like end portion 4A has a curved surface R1, in which the cross-sectional shape in the stacking direction is warped in an arc shape (or arc-like shape) that is concave toward the inner diameter direction. R2 is continuously formed in a two-stage shape. Then, the outer diameter side end portion of the end portion 4 </ b> A is formed in a stepped rubber end portion 4 a that is fitted into and bonded to the annular recess groove 7 formed in the flange plates 5 and 6.

  The stepped rubber end portion 4a is such that the thickness h1 from the surface of the flange plate on the outer diameter side of the step portions 5C and 6C, that is, the surfaces 8 and 9 of the outer peripheral flange portions 5B and 6B, is the step h of the step portions 5C and 6C. Are identical (or almost identical). Accordingly, the overall thickness of the stepped rubber end portion 4a is set to H = h1 (= h) + h2 (5 mm or 5 mm or more). The inner vertical wall portion 7b along the stacking direction at the inner diameter side end of the annular recess groove 7 and the outer vertical wall portions 12 and 13 along the stacking direction at the outer diameter side ends of the center flange portions 5A and 6A are continuous with each other. The concave groove 7 and the central flange portions 5A and 6A are formed adjacent to each other in the radial direction so as to form a surface.

  That is, in this case, step portions 5C and 6C are formed by the inner vertical wall portion 7b and the outer vertical wall portions 12 and 13. As compared with the case where the inner vertical wall portion 7b and the outer vertical wall portions 12 and 13 are formed separately, the production efficiency can be improved and the cost can be reduced by reducing the processing steps, and the adhesive peeling direction can be reduced. An adhesive layer having a large area in the shearing direction is formed, and there is an advantage that an adhesive structure stronger against peeling is obtained. Further, the minimum coating thickness W for the central flange portions 5A and 6A of the flared end portion 4A is set to be equal to or greater than the coating thickness w1 for the rigid plate 1 at the central portion of the coating rubber 4 in the stacking direction. It is desirable.

  In the seismic isolation laminated rubber C configured as described above, the stepped rubber end portion 4a in the tip-end shaped end portion 4A of the covering rubber 4 is formed at the inner diameter side end of the outer peripheral flange portions 5B and 6B. Since they are fitted into the recessed groove 7 and bonded together, the adhesive remains in the annular recessed groove 7 when the two are pressed and bonded together, and the lower surface 14 of the stepped rubber end portion 4a and the recessed portion are surely formed. The bottom surface 7a of the groove 7 is bonded. As a result, a necessary and sufficient adhesive is ensured, and the stepped rubber end portion 4a and the annular recessed groove 7 are firmly bonded to each other. It is possible to eliminate the possibility of peeling. In the situation where the end portions of the covering rubber 4 are adhered on a uniform surface as in the conventional case, the adhesive protrudes greatly due to the pressure contact between them, and the necessary and sufficient amount of adhesive cannot be taken substantially. However, the present invention is advantageous in that such inconvenience does not occur.

  In addition, the lower portion of the outer peripheral wall 15 of the stepped rubber end portion 4a and the outer peripheral wall 7c of the annular recessed groove 7 are bonded, and act as an adhesive surface that resists the force in the shear direction with respect to the peeling direction. As compared with the case of acting in the direction of peeling off (adhesion between the lower surface 14 and the bottom surface 7a), it is possible to provide a greater peeling strength. As a result, when the inconvenience of peeling occurs, the structure in which the lower portion of the outer peripheral wall 15 and the outer peripheral wall 7c, which are the places where peeling starts, is bonded in a state excellent in shear strength, so that the peel strength is higher than that of the conventional structure. It has improved dramatically, and it has become possible to eliminate the inconvenience that the end of the covering rubber 4 and the flange plates 5 and 6 are peeled off almost completely.

  In addition, it is described below for reference. Following the stepped rubber end portion 4a serving as a cushioning (cushion) region, an outwardly-flank end portion continuously formed on two curved surfaces R1 and R2 whose outer surfaces are curved in an arc shape in a longitudinal section toward the inside. (Rubber part with curved surface) 4A is integrally formed to ensure a large coating thickness at the end part of the covering rubber 4 so that the end part 4A which is widened with large lateral deformation is shown in FIG. As shown in the figure, the bent top is bent and deformed with the connecting top A of the two-step curved surfaces R1 and R2 as the inflection point, and the thick connecting top A is located at the deepest part. It will not occur. As a result, even if subjected to repeated deformation, cracks and cracks do not occur at the end of the coated rubber 4 which causes the damage or breakage of the laminated rubber C, and the seismic isolation performance and durability life of the laminated rubber C as a whole are improved. It can be guaranteed for a long time.

[Example 2]
The seismic isolation laminated rubber C according to the second embodiment is the same except that the seismic isolation laminated rubber C according to the first embodiment is different from each flange plate and the covering rubber 4. That is, as shown in FIG. 4, the thickness of the center flange portions 5A and 6A of the flange plates 5 and 6 is the same as the thickness of the outer peripheral flange portions 5B and 6B, and the depth of the annular recess groove 7 is constant h2. It has become a thing. Thus, the present invention can be applied to the seismic isolation laminated rubber C having the flange plates 5 and 6 in which the thickness of the central portion is not thick.

Example 3
The seismic isolation laminated rubber C according to the third embodiment is the same as the seismic isolation laminated rubber C according to the second embodiment except that the shape of the tip-end-shaped end portion 4A is different. That is, as shown in FIG. 5, the outer surface of the flared end 4 </ b> A is in a state in which the cross-sectional shape in the stacking direction is warped in an arc shape or an arc-like shape in which the inner surface is concave toward the inner diameter direction. It is formed on one curved surface R. Further, as indicated by phantom lines in FIG. 5, the wide end 4 </ b> A may be formed so as to be a straight surface S having an inclined cross-sectional shape in the stacking direction.

[Another Example]
The cross-sectional shape of the annular recessed groove 7 can be variously changed such as a downward narrowing triangle, a square, or a shape like a lower half of an ellipse.

Overall side view of judgment surface showing the structure of laminated rubber for seismic isolation (Example 1) Enlarged sectional view showing the end of the coated rubber in the normal (non-deformed) state (Example 1) Enlarged sectional view showing the end of the coated rubber in the deformed state (Example 1) Enlarged sectional view showing another structure of the end of the coated rubber (Example 2) Expanded sectional view showing another structure of the end of the coated rubber (Example 3) Sectional drawing of the principal part which shows the peeling condition of the conventional covering rubber edge part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rigid board 2 Elastic rubber layer 3 Laminated body 4 Cover rubber | gum 4A Pointed end part 4a Outer diameter side end part 5,6 Flange board 5A, 6A Central flange part 5C, 6C Step part 7 Annular recessed groove 7b Inner vertical wall Portions 8 and 9 Flange plate surface 12, 13 Stepped outer vertical wall portion R Curved surface R1, R2 Shape where curved surface is continuous in two steps h Stepped stepped portion h1 Flange plate surface at outer diameter side end Thickness from

Claims (5)

A seismic isolation system in which a covering rubber is provided to cover the entire outer periphery of a laminate in which a plurality of elastic rubber layers and rigid plates are alternately laminated, and flange plates are bonded and fixed to both ends in the stacking direction of the laminate. Laminated rubber for
An end portion of the covering rubber that contacts the flange plate is formed at a tip-end-like end portion that increases in diameter as it approaches the flange plate in the stacking direction, and an outer-diameter side end of the tip-end end portion. A base-isolated laminated rubber having a portion fitted into and bonded to an annular recessed groove formed in the flange plate.   2. The seismic isolation laminated rubber according to claim 1, wherein the annular recessed groove has a cross-sectional shape that is a flat rectangle having a thin thickness in the laminating direction.   The outer surface of the pointed end is a curved surface in which the cross-sectional shape in the stacking direction is curved in a concave shape toward the inner diameter direction or an arc-like shape, or the curved surface is continuous. The seismic isolation laminated rubber according to claim 1 or 2, wherein the laminated rubber is formed in a shape continuous in two steps.   The flange plate is formed with a step portion for projecting the central flange portion toward the laminated body side, and the outer diameter side end portion of the pointed end portion is located on the outer diameter side of the step portion. The laminated rubber for seismic isolation according to any one of claims 1 to 3, wherein a thickness of the stepped rubber is the same as or substantially the same as the step of the stepped portion. A single peripheral surface in which an inner vertical wall portion along the stacking direction at an inner diameter side end of the annular recess groove and an outer vertical wall portion along the stacking direction at an outer diameter side end of the stepped portion are continuous with each other; The seismic isolation laminated rubber according to claim 4, wherein the annular recessed groove and the stepped portion are formed adjacent to each other in the radial direction.

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