JP5660298B2 - Laminated rubber bearing - Google Patents

Description

  The present invention relates to a laminated rubber bearing for elastically supporting a large building such as a bridge or a building.

  As this type of elastic bearing, a laminate formed by laminating a plurality of reinforcing plates and rubber in the vertical direction, a flange plate attached to the upper end of the laminate, a flange plate attached to the lower end of the laminate, The thing provided with the cover layer which covers the side surface of a laminated body is known (for example, refer patent document 1).

JP-A-11-201228

  By the way, in the laminated rubber bearing, since the rubber of the laminated body is made of natural rubber (NR) or butadiene rubber (BR), in order to prevent the natural rubber or butadiene rubber constituting the laminated body from being deteriorated by ozone or ultraviolet rays, The side of the body is covered with a cover layer made of ethylene propylene rubber (EPM, EPDM) or chloroprene rubber (CR).

  As described above, the laminated rubber bearing is configured to prevent the laminated body from being deteriorated by ozone or ultraviolet rays by the cover layer, and the cover layer is formed from a rubber material that is less likely to generate ozone cracks. By use, the cover layer also undergoes curing deterioration, ozone cracks, and other cracks due to external forces. In addition, when an appearance inspection is periodically performed and a crack is generated in the cover layer, maintenance such as repair or replacement of the laminated rubber bearing is performed in consideration of safety.

  However, each of the laminated rubber bearings has many large ones, and the laminated rubber bearing supports a large building, and therefore, there is a problem that replacement of the laminated rubber bearing takes a lot of labor and cost. there were.

  The laminated rubber bearing is located between the bridge girder and the pier or between the building and the ground, so the appearance inspection of the laminated rubber bearing is not easy, and the laminated rubber bearing has a large area on its side. For this reason, there is a problem in that it takes a lot of labor and cost to repair the laminated rubber bearing.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a laminated rubber bearing capable of reducing labor and cost of repair and replacement.

In order to achieve the above object, the present invention provides a laminated rubber bearing comprising a laminate formed by laminating a plurality of reinforcing plates and rubber in the vertical direction, and a cover layer made of a rubber material and covering a side surface of the laminate. moisture in the air, and a uncured layer formed by sealed between the oxygen or at least one to thus cured compositions of light and the laminate and the cover layer in the air.

  As a result, a composition that is cured by moisture in the air, oxygen in the air, or light is enclosed between the laminate and the cover layer. When the sheet penetrates the cover layer, the composition enclosed between the laminate and the cover layer is ejected into the crack, oozes, or flows out, and the ejected composition is exposed to moisture or air in the air. Hardened by oxygen and light inside, cracks are closed.

  The present invention also provides a laminated rubber bearing comprising a laminated body formed by vertically laminating a plurality of reinforcing plates and rubber, and a cover layer made of a rubber material and covering a side surface of the laminated body. An intermediate layer made of a composition containing a peroxide-decomposable polymer and peroxide is provided between the cover layer and the cover layer.

  Here, since the intermediate layer contains a peroxide-decomposable polymer and peroxide, when it is vulcanized and molded by heating and pressurizing with a predetermined mold for vulcanization, it depends on the peroxide. The degradable polymer is decomposed, and the intermediate layer is not cured by heating and pressurizing in the predetermined vulcanizing mold, or is softened after curing, or is simply softened. For this reason, for example, ozone cracks are generated in the cover layer due to long-term use, and when the crack penetrates the cover layer, it is not cured, or is softened after curing, or is ejected into the crack of the intermediate layer that has been softened An intermediate layer that has oozed out or spilled out and erupted or the like covers the surface of the crack, and contact between the surface of the crack and oxygen or ozone, or ultraviolet irradiation to the surface of the crack can be prevented.

  According to the laminated rubber bearing of the present invention, cracks are closed by curing the ejected composition or the like, or the ejected intermediate layer covers the crack surface, and the crack surface is in contact with oxygen or ozone. Further, since it is possible to prevent the surface of the crack from being irradiated with ultraviolet rays, it is possible to prevent or delay the extension of the crack in the cover layer, and to reduce the labor and cost of repair and replacement of the laminated rubber bearing.

The figure which shows the attachment state of the laminated rubber bearing of 1st Embodiment of this invention Cross-sectional side view of laminated rubber bearing in the direction of the bridge axis Side cross-sectional view of laminated rubber bearing in the direction perpendicular to the bridge axis Cross-sectional side view of laminated rubber bearing in the direction of the bridge axis Side cross-sectional view of the main part of the laminated rubber bearing in the bridge axis direction Side cross-sectional view of the main part of the laminated rubber bearing in the bridge axis direction Side surface sectional view of the laminated rubber bearing showing the second embodiment of the present invention in the bridge axis direction Cross-sectional side view of the main part of the laminated rubber bearing in the direction perpendicular to the bridge axis Side cross-sectional view of the main part of the laminated rubber bearing in the bridge axis direction

  A laminated rubber bearing according to a first embodiment of the present invention will be described with reference to FIGS. This laminated rubber support is arranged between the bridge girder 1 and a support 2 such as a bridge pier. Further, for example, the bridge girder 1 is provided with an automobile road on the upper surface, and is supported on the support 2 by a plurality of laminated rubber supports provided so as to be arranged in the direction Y perpendicular to the bridge axis.

  As shown in FIGS. 1 and 2, the laminated rubber support is attached to a sole plate 10 having an upper end fixed to the bridge girder 1 and attached to a base plate 20 having a lower end fixed to the support 2.

  The sole plate 10 is a rectangular plate member made of a steel material, and is attached to the bridge girder 1 by a plurality of anchor bolts 10a. A concave portion 10b is provided at a substantially central portion on the lower surface of the sole plate 10, and the concave portion 10b is formed so that a horizontal cross section is circular.

  The base plate 20 is a rectangular plate member made of a steel material, and is attached to the support 2 by a plurality of anchor bolts 20a. A concave portion 20b is provided at a substantially central portion on the upper surface of the base plate 20, and the concave portion 20b is formed so that a horizontal cross section is circular.

  As shown in FIGS. 2 and 3, the laminated rubber bearing includes an upper collar 30 attached to the lower surface of the sole plate 10, a lower collar 40 attached to the upper surface of the base plate 20, an upper collar 30 and a lower collar. The laminated body 50 disposed between the flanges 40, the cover layer 60 that covers the side surface 50a in the bridge axis direction X and the side surface 50b in the bridge axis perpendicular direction Y of the laminated body 50, and the laminated body 50 and the cover layer 60 And an uncured layer 70 provided therebetween.

  The upper rod 30 is a rectangular plate member made of a steel material, and is attached to the sole plate 10 by a plurality of bolts 30a. In addition, a through hole 30b is provided in a substantially central portion of the upper collar 30, and the through hole 30b is formed so that a horizontal cross section has a circular shape.

  The lower bar 40 is a rectangular plate member made of a steel material, and is attached to the base plate 20 by a plurality of bolts 40a. In addition, a through hole 40b is provided in a substantially central portion of the lower rod 40, and the through hole 40b is formed so that a horizontal cross section has a circular shape.

  The laminated body 50 includes an upper reinforcement plate 51 attached to the upper collar 30, a lower reinforcement board 52 attached to the lower collar 40, and an upper reinforcement plate 51 and a lower reinforcement board 52. It has a plurality of reinforcing plates 53 provided at intervals, and a rubber 54 bonded to each of the reinforcing plates 51, 52, 53 by vulcanization adhesion.

  The upper reinforcing plate 51 is a rectangular plate member made of a steel material and is attached to the upper rod 30 by a plurality of bolts 51a. In addition, a concave portion 51b is provided at a substantially central portion of the upper surface of the upper reinforcing plate 51, and the concave portion 51b is formed so that a horizontal cross section is circular. The key member 51c is inserted into the concave portion 51b, and the upper end side of the key member 51c is inserted into the concave portion 10b of the sole plate 10 through the through hole 30b of the upper collar 30.

  The lower reinforcing plate 52 is a rectangular plate member made of a steel material, and is attached to the lower bar 40 by a plurality of bolts 52a. In addition, a concave portion 52b is provided at a substantially central portion of the lower surface of the lower reinforcing plate 52, and the concave portion 52b is formed so that a horizontal cross section is circular. The key member 52c is inserted into the concave portion 52b, and the lower end side of the key member 52c is inserted into the concave portion 20b of the base plate 20 through the through hole 40b of the upper collar 40.

  Each reinforcing plate 53 is a rectangular plate-shaped member made of a steel material, and is formed thinner than the upper reinforcing plate 51 and the lower reinforcing plate 52.

  Examples of the rubber 54 include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), butyl rubber (IIR), and halogenated butyl rubber (BR-IIR). , Cl-IIR), chloroprene rubber (CR), one kind of polymer, or a mixture of plural kinds of polymers, such as carbon black, vulcanizing agent, plasticizer, stabilizer, anti-aging agent, processing aid, etc. It is obtained by vulcanizing a rubber compounding agent as appropriate. Other reinforcing agents can be used instead of carbon black.

  The cover layer 60 has better weather resistance than natural rubber, isoprene rubber or styrene butadiene rubber, for example, ethylene propylene rubber (EPM, EPDM), halogenated butyl rubber (BR-IIR, Cl-IIR), chloroprene rubber (CR ), Urethane rubber (U), silicon rubber (Q), or a mixture of polymers, carbon black, vulcanizing agent, plasticizer, stabilizer, anti-aging agent, processing aid These are obtained by vulcanizing an appropriate blend of a rubber compounding agent such as a pigment. Other reinforcing agents can be used instead of carbon black.

  The uncured layer 70 is, for example, a known polyurethane-based sealing material which is mainly composed of a urethane prepolymer and is cured by moisture (humidity) in the air, as described in JP-A-11-286602, As described in 2003-221575, a modified silicone-based known sealing material that contains a modified silicone as a main component and is cured by light (moisture) in the air, or Japanese Patent Application Laid-Open No. 2006-225545. Thus, it can be formed using a known resin-based paste-like or gel-like composition that contains an epoxy compound as a main component and is cured by light. Further, the paste-like or gel-like composition constituting the uncured layer 70 is a paste-like or gel-like composition having a viscosity at 20 ° C. of 1000 Pa · s or more in a state before curing, and in the air in the humidity or in the air Any composition other than those described above can be used as long as it is cured by oxygen and light and has rubber-like elasticity after curing.

  The uncured layer 70 is formed by, for example, applying an unvulcanized rubber sheet for forming the cover layer 60 after applying the paste-like or gel-like composition to the side surfaces 50a, 50b of the vulcanized laminate 50. Is wound around the side surfaces 50a, 50b of the laminated body 50 coated with a gel-like or gel-like composition, and vulcanized by applying pressure and temperature in a predetermined vulcanizing mold. Is done. Thereby, the cover layer 60 is vulcanized, and for example, the upper end of the cover layer 60 and the upper end of the laminate 50 are bonded by vulcanization, and the lower end of the cover layer 60 and the lower end of the laminate 50 are vulcanized. The pasty or gel-like composition is sealed between the laminate 50 and the cover layer 60, and an uncured layer 70 made of the paste-like or gel-like composition is formed. Incidentally, after the paste-like or gel-like composition is applied to the side surfaces 50a, 50b of the vulcanized laminate 50, a vulcanized rubber sheet for molding the cover layer 60 is formed into a paste-like or gel-like composition. The laminated body 50 and the cover layer 60 are wound around the side surfaces 50a and 50b of the applied laminated body 50 over the entire circumference, and the upper and lower ends of the vulcanized rubber sheet are bonded to the laminated body 50 over the entire circumference. It is also possible to enclose a paste-like or gel-like composition between them.

  In addition, after the laminated rubber support is vulcanized so as to provide a certain distance between the laminated body 50 and the cover layer 60, the laminated rubber support is provided in a certain space provided between the laminated body 50 and the cover layer 60. It is also possible to inject and enclose the paste-like or gel-like composition.

  The laminated rubber bearing configured as described above supports the bridge girder 1 in the vertical direction and / or in the horizontal direction. Further, for example, when the bridge expands and contracts in the bridge axis direction X due to a change in temperature, the laminated rubber bearing is elastically deformed in the bridge axis direction X as shown in FIG.

  When a load in the vertical direction is applied to the laminated rubber support, the rubber 54 between the reinforcing plates 51, 52, 53 is pushed outward in the horizontal direction, and the laminated body is pushed by the pushed rubber 54 as shown in FIG. 50 side surfaces protrude, and according to the protrusion, the cover layer 60 and the uncured layer 70 are deformed. Here, the uncured layer 70 is made of a paste-like or gel-like composition, and the uncured layer 70 is flexibly deformed between the side surfaces 50a, 50b of the laminate 50 and the cover layer 60, so that the cover layer 60 is entirely formed. Compared with the case where the laminate 50 is bonded to the side surfaces 50a and 50b by vulcanization, the deformation of the cover layer 60 can be reduced by the flexible deformation of the uncured layer 70. When rubber is exposed to ozone or ultraviolet rays in a state where tensile deformation has occurred, the surface is relatively quickly deteriorated and cracks such as ozone cracks are likely to occur on the surface. Further, below the bridge girder 1 is a place that is relatively easily affected by ultraviolet rays and ozone. For this reason, by reducing the deformation of the cover layer 60 by the flexible deformation of the uncured layer 70, the crack resistance of the cover layer 60 against ozone cracks and the like can be improved.

  In the laminated rubber support of the present embodiment, a paste-like or gel-like composition that is cured by moisture or light in the air is enclosed between the laminate 50 and the cover layer 60. A paste-like or gel-like composition enclosed between the laminate 50 and the cover layer 60 when ozone cracks occur in the cover layer 60 and the crack C penetrates the cover layer 60 as shown in FIG. As a result, the paste-like or gel-like composition ejected into the crack C is cured by moisture or light in the air, and the paste-like or gel-like composition is cured to crack C. Is blocked.

  Thus, according to the present embodiment, the crack C is closed by curing the paste-like or gel-like composition, so that the extension of the crack C in the cover layer 60 can be prevented or delayed, and the laminated rubber The trouble and cost of repair and replacement of the bearing can be reduced.

  Next, a laminated rubber bearing according to a second embodiment of the present invention will be described with reference to FIGS. The laminated rubber bearing of the second embodiment includes an upper rod 30, a lower rod 40, and a laminated body 50 equivalent to those of the first embodiment, and further, a side surface 50a in the bridge axis direction X of the laminated body 50 and a right angle of the bridge axis. A cover layer 80 that covers the side surface 50 b in the direction Y, and an intermediate layer 90 disposed between the stacked body 50 and the cover layer 80 are provided.

  The cover layer 80 has better weather resistance than natural rubber, isoprene rubber, and styrene butadiene rubber. For example, ethylene propylene rubber (EPM, EPDM), halogenated butyl rubber (BR-IIR, Cl-IIR), chloroprene rubber (CR ), Urethane rubber (U), silicon rubber (Q), or a mixture of polymers, carbon black, vulcanizing agent, plasticizer, stabilizer, anti-aging agent, processing aid These are obtained by vulcanizing an appropriate blend of a rubber compounding agent such as a pigment. Other reinforcing agents can be used instead of carbon black.

  The intermediate layer 90 is made of a composition containing a polymer decomposable by peroxide such as polyisobutylene and containing 0.2 to 20 parts by weight of peroxide with respect to 100 parts by weight of the polymer. Examples of peroxides include acyl peroxides such as benzoyl peroxide and P-chlorobenzoyl peroxide, ketone peroxides such as methyl ethyl ketone peroxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, t- Peroxyesters such as butylperoxyphthalate, dicumyl peroxide, di-t-butylperoxybenzoate, alkyl peroxides such as 1,3-bis (t-butylperoxyisopropyl) benzene, t-butylhydro Hydroperoxides such as peroxide can be mentioned, but other peroxides can also be used. In addition, the composition may be added with a catalyst such as cobalt naphthenate in order to promote decomposition of the polymer by peroxide, an inorganic filler such as carbon black or silica, Adhesives such as aromatic process oils, naphthenic process oils, paraffinic process oils and other plasticizers, stabilizers, anti-aging agents, processing aids, pigments and other It is possible to mix | blend a rubber compounding agent suitably. A polymer other than polyisobutylene can be used as long as it is a polymer having decomposability by peroxide. The intermediate layer 90 is formed by heating and pressurizing the composition with a predetermined vulcanizing mold as will be described later.

  The intermediate layer 90 is formed, for example, by winding a sheet-like member made of the composition for forming the intermediate layer 90 on the side surfaces 50a and 50b of the vulcanized laminate 50 over the entire circumference, and then covering the cover layer. An unvulcanized rubber sheet for forming 80 is wound around the entire circumference of the side surfaces 50a and 50b of the laminated body 50 around which the sheet-like member for the intermediate layer 90 is wound. Molded by applying pressure and temperature in a mold and vulcanizing. Thereby, the cover layer 80 is vulcanized, and for example, the upper end of the cover layer 80 and the upper end of the laminate 50 are bonded by vulcanization, and the lower end of the cover layer 80 and the lower end of the laminate 50 are vulcanized. The intermediate layer 90 is sealed between the laminate 50 and the cover layer 80.

  As in the first embodiment, the laminated rubber bearing configured as described above is elastically deformed in the bridge axis direction X when the bridge expands and contracts in the bridge axis direction X due to a change in temperature, for example. When a load in the vertical direction is applied to the laminated rubber support, the rubber 54 between the reinforcing plates 51, 52, 53 is pushed outward in the horizontal direction, and the laminated body 50 is pushed by the pushed rubber 54 as shown in FIG. The side surfaces of the cover layer 80 protrude and the cover layer 80 and the intermediate layer 90 are deformed in accordance with the protrusion.

  Here, the intermediate layer 90 contains a polymer decomposable by peroxide and contains 0.2 to 20 parts by weight of peroxide with respect to 100 parts by weight of the polymer, and the laminate 50 and the cover layer. The laminate 50, the intermediate layer 90, and the cover layer 80 are molded by heating and pressing in a predetermined vulcanizing mold so that the intermediate layer 90 is disposed between the cover layer 80 and the intermediate layer 90. Since the upper end and the lower end are bonded to the laminate 50, the polymer of the intermediate layer 90 is decomposed by heating and pressurizing in the predetermined vulcanizing mold, and the predetermined vulcanizing gold The intermediate layer 90 is not cured by heating and pressing in the mold, or is softened after curing, or simply softened. For this reason, for example, ozone cracks occur in the cover layer 80 due to long-term use, and when the crack C penetrates the cover layer 80 as shown in FIG. 9, it did not harden, softened after curing, or simply softened The intermediate layer 90 is ejected into the crack C, oozes out, or flows out, and the ejected intermediate layer 90 covers the surface of the crack C, and the surface of the crack C contacts with oxygen or ozone, or to the surface of the crack C. UV irradiation can be prevented.

  Thus, according to the present embodiment, the intermediate layer 90 that has flowed into the crack C covers the surface of the crack C, and prevents contact between the surface of the crack C and oxygen or ozone, or irradiation of the crack C with ultraviolet rays. Therefore, extension of the crack C of the cover layer 60 can be prevented or delayed, and labor and cost for repair and replacement of the laminated rubber bearing can be reduced.

  Further, the intermediate layer 90 is not cured by heating and pressurization in the predetermined vulcanization mold, or is softened after curing, or is simply softened, and the intermediate layer 90 is covered with the side surfaces 50a and 50b of the laminate 50 and the cover. Since the cover layer 80 is deformed flexibly with the layer 80, the cover layer 80 is covered with the intermediate layer 90 more flexibly than the case where the cover layer 80 is bonded to the side surfaces 50a, 50b of the laminate 50 by vulcanization. The deformation of the layer 80 can be reduced. When rubber is exposed to ozone or ultraviolet rays in a state where tensile deformation has occurred, the surface is relatively quickly deteriorated and cracks such as ozone cracks are likely to occur on the surface. Further, below the bridge girder 1 is a place that is relatively easily affected by ultraviolet rays and ozone. For this reason, by reducing the deformation of the cover layer 80 by the flexible deformation of the intermediate layer 90, the crack resistance of the cover layer 80 against ozone cracks and the like can be improved.

  In the present embodiment, the intermediate layer 90 uses only a polymer having a decomposability due to peroxide as the polymer. On the other hand, other rubber polymers such as ethylene propylene rubber (EPM, EPDM) polymer can be blended in the intermediate layer 90, and further, a polymer decomposable by peroxide is crosslinked by peroxide. It is also possible to blend the polymers to be used. Even in this case, when the crack C is generated in the cover layer 80, if the composition of the intermediate layer 90 is ejected into the crack C, oozes, or flows out, the same effect as described above can be obtained. Can be achieved.

  In the first and second embodiments, the uncured layer 70 and the intermediate layer 90 can be colored red, yellow, green, pink, orange, white, gray, and the like. Thereby, it is possible to easily confirm that the uncured layer 70 and the intermediate layer 90 have flowed out from the cracks of the cover layers 60 and 80, which is advantageous in efficiently performing the maintenance of the laminated rubber bearing.

  In the first and second embodiments, the uncured layer 70 and the intermediate layer 90 are provided on both side surfaces 50a in the bridge axis direction X and both side surfaces 50b in the direction perpendicular to the bridge axis. On the other hand, it is possible to provide the uncured layer 70 and the intermediate layer 90 on only one of the four side surfaces of the laminated body 50 where cracks are likely to occur. In this case, the same effect as described above can be achieved. It is.

  In the first and second embodiments, the laminated rubber bearing for supporting the bridge girder 1 is shown. However, it is possible to apply the same configuration as that of the present embodiment to the laminated rubber bearing for buildings and other large buildings. .

  DESCRIPTION OF SYMBOLS 1 ... Bridge girder, 2 ... Support body, 10 ... Sole plate, 20 ... Base plate, 30 ... Upper collar, 40 ... Lower collar, 50 ... Laminated body, 50a ... Side surface in the direction of a bridge axis, 50b ... Side surface in a direction perpendicular to a bridge axis, DESCRIPTION OF SYMBOLS 51 ... Upper reinforcing plate, 52 ... Lower reinforcing plate, 53 ... Reinforcing plate, 54 ... Rubber, 60 ... Cover layer, 70 ... Uncured layer, 80 ... Cover layer, 90 ... Intermediate layer

Claims (6)

In a laminated rubber bearing comprising a laminate formed by laminating a plurality of reinforcing plates and rubber in the vertical direction, and a cover layer made of a rubber material and covering a side surface of the laminate,
Rubber, characterized by comprising moisture in the air, the uncured layer formed by sealed between the oxygen or at least one to thus cured compositions of light and the laminate and the cover layer in the air Support. The laminated rubber bearing according to claim 1, wherein the composition is a paste-like or gel-like composition having a viscosity at 20 ° C. of 1000 Pa · s or more. In a laminated rubber bearing comprising a laminate formed by laminating a plurality of reinforcing plates and rubber in the vertical direction, and a cover layer made of a rubber material and covering a side surface of the laminate,
A laminated rubber bearing comprising an intermediate layer made of a composition containing a polymer decomposable by peroxide and peroxide between the laminate and the cover layer. The laminated rubber bearing according to claim 3, wherein the composition is a composition containing 0.2 to 20 parts by weight of peroxide with respect to 100 parts by weight of a polymer having decomposability by peroxide. The laminated body, the intermediate layer, and the cover layer are heated and pressurized in a predetermined vulcanization mold so that the intermediate layer is disposed between the laminated body and the cover layer. The laminated rubber bearing according to claim 3, wherein the intermediate layer is provided between the cover layer and the cover layer. The laminated rubber bearing according to any one of claims 3, 4 and 5, wherein a part of the cover layer is bonded to the laminated body.

Images