JP2011106624A - Bearing damage determining device, method for mounting the same, and bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing damage determining device capable of accurately and easily detecting whether a bearing is damaged with simple constitution. <P>SOLUTION: The surface of outer skin rubber 18 covering the outer periphery of a laminate 14 formed by alternately laminating rubber layers 16 and metal plates 15 of the bearing 10 arranged between a bridge pier 106 and a bridge girder 108 to support the bridge girder 108 movably relative to the bridge pier 106, is mounted with a rubber piece 22 constituting the damage determining device 20 to extend across at least two adjacent metal plates 15. The extending performance of the rubber piece 22 is preset to cause breakage when the relative displacement D between the bridge pier 106 and the bridge girder 108 exceeds the displacement limit DL, the presence of damage in the bearing 10 can be accurately and easily detected with simple constitution. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a damage determination device for a bearing for performing damage determination of a bearing disposed between a supporting member and a supported member, and a method for mounting the damage determination device for a bearing for mounting the damage determination device for a bearing on the bearing. And a bearing to which a damage judging device for bearings is attached.

  2. Description of the Related Art A bearing that supports a structure (supported member) such as a building or a bridge by isolating it from the support member is known. Such a support is disposed between the support member and the supported member, supports the upper structure as the supported member, and allows the support member and the supported member to move relative to each other in the horizontal direction. This support allows relative movement between the supported member and the support member by elastic deformation of the support itself.

  By the way, the bearing is deformed and restored without being damaged if it is elastically deformed up to a predetermined limit displacement amount corresponding to the component, but if the limit displacement amount is exceeded, there is a possibility that the bearing is damaged. It is expensive and requires treatment such as replacement and repair.

  Therefore, a technique has been devised in which the displacement amount of the bearing is measured with a sensor or the like and the presence or absence of damage is determined from the measured value (for example, Patent Documents 1 and 2). However, since a plurality of sensors are arranged for measurement, the configuration is complicated and the cost is increased.

  On the other hand, the elongation performance of the rubber wall that constitutes the outer surface of the bearing is specified so that it will break (break) when the relative displacement between the bridge girder and the pier exceeds the limit displacement of the bearing. A technique for determining the presence or absence of damage has been devised (for example, Patent Document 3). However, the rubber wall that constitutes the outer surface of the bearing in the cited document 3 is intended to protect the rubber body that constitutes the inner side of the bearing from ultraviolet rays and the like, and the elongation performance as prescribed at the time of vulcanization adhesion to the rubber body Is difficult to apply stably.

Japanese Patent Laid-Open No. 11-303020 Japanese Patent Application Laid-Open No. 10-025710 JP 2009-007797 A

  The present invention has been made to solve the above-described problems, and is provided with a damage determination device for a bearing capable of accurately and easily detecting the presence or absence of damage to the bearing with a simple configuration, and for attaching the damage determination device for a bearing to the bearing. It is an object of the present invention to provide a mounting method for a damage determination device for a bearing and a support to which the damage determination device for a bearing is attached.

  The bearing damage determination device according to claim 1 is arranged between a supporting member and a supported member, and a laminated body in which inner elastic members and hard plates harder than the inner elastic members are alternately laminated, and the laminated body An outer elastic member that covers the outer periphery of the bearing, and a damage determination device for a bearing for determining damage to the bearing that supports the supported member so as to be movable relative to the supporting member, the outer elastic member of the bearing Damage that is attached to the surface of the plate and straddles at least two adjacent hard plates, and that is detectably damaged when the relative displacement between the support member and the supported member exceeds a preset value. A determination member.

  In the bearing damage determination device according to the first aspect, when the relative displacement amount between the support member and the supported member exceeds a preset value, the damage determination member is detectably damaged. Here, the detectable damage refers to damage that can be detected visually, such as cutting, breaking, and cracking. By attaching the damage determination member to the surface of the outer elastic member of the bearing, it can be easily detected whether the bearing has undergone deformation exceeding the set value by visual observation.

  For example, when the set value of the relative displacement amount is set to the limit displacement amount of the bearing, it is possible to visually detect whether the bearing has undergone deformation exceeding the limit displacement amount. Thereby, the presence or absence of damage to a bearing can be determined easily.

  Furthermore, since the presence or absence of damage to the bearing can be determined from the state of the damage determination member, a sensor or the like is not required and the configuration can be simplified.

  And, since the damage determination member that breaks when the relative displacement amount between the support member and the supported member exceeds the set value is attached to the surface of the outer elastic member of the support across at least two adjacent hard plates, For example, it is possible to accurately detect whether the bearing has undergone deformation exceeding the set value as compared with the case using an outer elastic member that breaks when the relative displacement exceeds the set value. Thereby, the presence or absence of damage to the bearing can be accurately detected.

  The damage determination device for a bearing according to claim 2 is the damage determination device for a bearing according to claim 1, wherein the damage determination member is made of an elastic material, and the elongation at break of the damage determination member is determined by the outer elastic member and the inner elastic member. It is set so as to break when it is smaller than the member and the relative displacement exceeds the set value.

  In the bearing damage determination apparatus according to the second aspect, the damage determination member breaks when the relative displacement amount between the support member and the supported member exceeds a preset value.

  In addition, since the breaking elongation of the damage determination member is smaller than the breaking elongation of the outer elastic member and the inner elastic member, the damage before the outer elastic member and the inner elastic member are destroyed by the relative movement of the supporting member and the supported member. The judgment member breaks. Thereby, it is possible to detect from the state of the damage determination member how much deformation the bearing has received before the bearing is damaged.

  The damage determination device for a bearing according to claim 3 is the damage determination device for a bearing according to claim 1 or 2, wherein a plurality of the damage determination members are attached to the surface of the outer elastic member. The set values of the relative displacement amounts are individually set.

  In the damage determination apparatus for bearings according to claim 3, the magnitude of deformation received by the bearings can be detected stepwise by damaging different damage judgment members whose relative displacement amounts are set individually. .

  The damage determination apparatus for a bearing according to claim 4 is the damage determination apparatus for a bearing according to claim 3, wherein one of the plurality of damage determination members is configured such that the set value of the relative displacement amount is a limit displacement amount of the bearing. Is set to

  In the damage determination device for a bearing according to claim 4, since the set value of the relative displacement amount is set to the limit displacement amount of the bearing, it is possible to determine whether or not the bearing is damaged by damaging the damage determination member. it can.

  The damage determination device for a bearing according to claim 5 is the damage determination device for a bearing according to any one of claims 1 to 4, wherein the damage determination member is long, and only both ends in the longitudinal direction are the The outer elastic member is attached to a position corresponding to the hard plate on the surface.

  In the bearing damage determination device according to the fifth aspect, only the both ends in the longitudinal direction of the damage determination member are attached to the positions corresponding to the hard plate, avoiding the position corresponding to the inner elastic member on the surface of the outer elastic member. With this configuration, the magnitude of deformation received by the support can be accurately detected without being influenced by the elastic deformation of the inner elastic member.

  The mounting method of the damage determination apparatus for a support according to claim 6 is provided between the supporting member and the supported member, and a laminated body in which inner elastic members and hard plates harder than the inner elastic members are alternately laminated. A damage determination for a bearing according to any one of claims 1 to 5, wherein the bearing is provided with an outer elastic member that covers an outer periphery of the laminated body and supports the supported member so as to be relatively movable with the supporting member. A method of mounting a damage determination device for a bearing for mounting a device, wherein the position of the hard plate of the support is detected, and the damage determination member is placed on the outside so as to straddle at least two adjacent hard plates. It is attached to the surface of the elastic member.

In the mounting method of the damage determination device for a support according to claim 6, the position of the hard plate of the support including the laminate and the outer elastic member is detected, and the damage determination member is arranged so as to straddle at least two adjacent hard plates. It is attached to the surface of the outer elastic member. Thereby, it is possible to accurately and easily detect the presence or absence of damage to the bearing with a simple configuration.
In addition, the support which attaches a damage judgment member may be a support in the middle of manufacture, or an existing support.

  The bearing according to claim 7 is attached with the damage determination device for bearing according to any one of claims 1 to 5.

  In the bearing according to the seventh aspect, the presence or absence of damage to the bearing is accurately and easily detected by the bearing damage judging device having a simple structure.

  The above-mentioned “supported member” may be a structure supported through a support, such as an office building, a hospital, an apartment house, a museum, a public hall, a school, a government building, a shrine, a temple, a bridge, a competition Place, lighting, etc. The “support member” may be any member that supports the above-mentioned supported member via a support, and includes, for example, the foundation, foundation, ground, and the like of these supported members.

  As described above, the bearing damage determination device, the mounting method of the bearing damage determination device, and the bearing according to the present invention can accurately and easily detect the presence or absence of damage to the bearing with a simple configuration.

It is a partially broken figure which shows the support and damage determination apparatus of 1st Embodiment of this invention. It is the A section expanded sectional view of FIG. 1 is a perspective view of a support and damage determination apparatus according to a first embodiment of the present invention. It is a partially broken figure which shows the deformation | transformation state of the horizontal direction of the support of 1st Embodiment of this invention. It is the B section expanded sectional view of Drawing 4. (A) It is a top view of the rubber piece which shows the state which the rubber piece fractured | ruptured by the deformation | transformation of the support. (B) It is the 6B-6B sectional view taken on the line of FIG. It is a perspective view of the support and damage determination apparatus of 2nd Embodiment of this invention. It is a top view of the rubber piece which comprises the damage determination apparatus of 2nd Embodiment of this invention. It is a top view of the coating film which comprises the damage determination apparatus of 3rd Embodiment of this invention. It is CC sectional view taken on the line of FIG. It is a top view which shows the shape of the rubber piece of other embodiment of this invention.

[First Embodiment]
Hereinafter, the damage determination device 20 according to the first embodiment of the present invention, the attachment method of the damage determination device 20 for attaching the damage determination device 20 to the support 10, and the support 10 to which the damage determination device 20 is attached will be described. FIG. 1 shows a partially cutaway view of the support 10, and FIG. 2 shows an enlarged view of part A of the support 10.

  As illustrated in FIG. 1, the damage determination device 20 determines whether or not the support 10 disposed between a bridge pier 106 that is an example of a supporting member and a bridge girder 108 that is an example of a supported member is damaged. Is.

The support 10 includes a lower plate 11, an upper plate 12, a laminate 14 disposed between the lower plate 11 and the upper plate 12, and a skin rubber 18 that is an example of an outer elastic member.
The lower plate 11 is fixed to the upper surface of the bridge pier 106 with bolts (not shown), and the upper plate 12 is fixed to the lower surface of the bridge girder 108 with bolts (not shown). Each of the upper plate 12 and the lower plate 11 may be fixed using a bolt other than a bolt.

  The laminated body 14 has a quadrangular prism shape, and is configured by alternately laminating a rubber layer 16 that is an example of an inner elastic member and a metal plate 15 that is an example of a hard plate harder than the rubber layer 16. . The hard plate may be a resin plate or the like as long as it is harder than the rubber layer 16.

Further, the entire outer peripheral surface of the laminated body 14 is covered with a skin rubber 18. The outer rubber 18 protects the rubber layer 16 from ultraviolet rays and the like, and the metal plate 15 is protected from wind and rain to improve its durability.
Specific examples of the material for the rubber layer 16 and the outer rubber 18 include synthetic rubber such as EPDM.

  As shown in FIG. 3, a damage determination device 20 is attached to the support 10. The damage determination device 20 is composed of two long rubber pieces 22. The two rubber pieces 22 are respectively joined to one surface 18X in the X direction and one surface 18Y in the Y direction adjacent to the surface 18X, of the surface of the outer rubber 18. In the present embodiment, among the horizontal directions, the direction corresponding to the longitudinal direction of the bridge beam 108 is defined as the Y direction, and the direction corresponding to the width direction (direction perpendicular to the longitudinal direction) of the bridge beam 108 is defined as the X direction.

  As shown in FIGS. 1 and 2, the rubber pieces 22 are bonded to the surfaces 18X and 18Y of the outer rubber 18 across at least two adjacent (in this embodiment, two adjacent) metal plates 15. Has been. The joining between the rubber piece 22 and the surfaces 18X and 18Y of the outer rubber 18 may be any joining such as joining using an adhesive or vulcanization joining. In the present embodiment, the two rubber pieces 22 are both joined to the center portions in the width direction of the surfaces 18X and 18Y of the outer rubber 18.

Further, in the present embodiment, as shown in FIG. 2, only both end portions 22 </ b> A in the longitudinal direction of the rubber piece 22 are joined to positions corresponding to the metal plates 15 on the surfaces 18 </ b> X and 18 </ b> Y of the outer rubber 18.
Although not shown in FIG. 1, the laminated body 14 always receives the weight of the bridge girder 108, and therefore, actually, as shown in FIG. 2, the rubber layer 16 sandwiched between the metal plates 15 is provided. The portion corresponding to the rubber layer 16 of the outer rubber 18 swells outward by being elastically deformed by the weight of the bridge girder 108 and bulging outward.

The rubber piece 22 is set so that the elongation at break is smaller than that of the rubber layer 16 and the outer rubber 18.
The rubber piece 22 has a set value (in this embodiment, the limit displacement of the support 10) in which a horizontal relative movement amount (hereinafter referred to as a relative displacement amount D) between the bridge girder 108 and the bridge pier 106 is preset by the user. When the amount DL) is exceeded, the elongation performance is such that breakage or cracking occurs. In addition, the elongation at break (elongation performance) mentioned here refers to what is calculated | required by the test based on JISK6251 (2004).
Further, the limit displacement amount DL is an allowable deformation amount in the horizontal direction of the stacked body 14, and is a value smaller than the maximum value of the displacement amount that is restored to the original state without being damaged after the stacked body 14 is deformed. Has been. The limit displacement DL is set in advance by the user according to the characteristics of the laminate 14.

Next, an attachment procedure for attaching the damage determination device 20 to the support 10 will be described.
First, the two rubber pieces 22 having the elongation performance that breaks when the relative displacement amount D exceeds a preset value, which constitutes the damage determination device 20, are manufactured. In addition, the rubber piece 22 of the present embodiment is manufactured based on information obtained by previously obtaining a rubber material composition and vulcanization conditions so that a predetermined elongation performance can be exhibited.

Next, the position of the metal plate 15 is detected by a metal detector or visual inspection.
Then, both end portions 22A of the first rubber piece 22 are respectively joined to the positions of the surface 18Y of the outer rubber 18 corresponding to the two adjacent metal plates 15, and both end portions 22A of the second rubber piece 22 are joined. Are joined to the positions corresponding to the two adjacent metal plates 15 on the surface 18X of the outer rubber 18 respectively. Thereby, the rubber piece 22 will be in the state attached ranging over the two adjacent metal plates 15. FIG. In this way, the damage determination device 20 is attached to the support 10.
As described above, the rubber piece 22 and the outer rubber 18 may be bonded by vulcanization bonding or bonding by an adhesive.

  Note that the support 10 to which the damage determination device 20 is attached is already in a state where it is disposed between the bridge pier 106 and the bridge girder 108 and supports the bridge girder 108 so as to be movable relative to the bridge pier 106, so-called existing state. It may be in the middle of manufacture. When the support 10 is in an existing state, the portion of the outer rubber 18 corresponding to the rubber layer 16 bulges outward due to the weight of the bridge girder 108 (see FIG. 2). For this reason, the position of the metal plate 15 can be detected visually. Further, when the support 10 is in the middle of manufacturing, the position of the metal plate 15 can be detected based on the design material.

Next, the operation of the support 10 and the damage determination device 20 of the first embodiment will be described.
For example, when the bridge pier 106 and the bridge girder 108 move relative to each other in the horizontal direction (in the direction of arrow Y in FIG. 4) from the position shown in FIG. It acts as a restoring force on the bridge pier 106 and the bridge girder 108. As a result, the relative movement between the bridge pier 106 and the bridge girder 108 is restricted and lengthened, so that they return to the position before the relative movement and the energy of the relative movement is absorbed.

  When the relative displacement amount D at this time is equal to or smaller than the limit displacement amount DL which is a preset setting value, the rubber piece 22 is elastically deformed as shown in FIG. 2 is restored as shown in FIG.

  On the other hand, when the relative displacement amount D exceeds the limit displacement amount DL, as shown in FIGS. 6 (A) and 6 (B), damage DM such as breakage (for example, breakage or crack) of the rubber piece 22 is caused. Occurs. This damage DM remains even when the pier 106 and the bridge girder 108 return to the positions shown in FIG.

  As shown in FIG. 6, since the rubber piece 22 is bonded to the surface of the outer rubber 18, the damaged DM can be visually confirmed from the outside, so that the damaged DM can be easily detected. If the rubber piece 22 is broken or cracked, it can be seen that the deformation of the laminated body 14 and the outer rubber 18, that is, the deformation exceeding the limit displacement DL has occurred. It can be determined that the inner rubber portion may be damaged. That is, the presence or absence of damage to the support 10 can be easily determined visually.

  Furthermore, since the presence or absence of damage to the support can be determined from the state of the rubber piece 22, no measuring instrument such as a sensor is required, and the configuration can be simplified.

  Then, the rubber piece 22 whose elongation at break (elongation performance) is set so as to break when the relative displacement amount D exceeds a preset set value is formed on the surface of the outer rubber 18 of the support 10 and on the two adjacent metal plates 15. Since it is mounted across, for example, it is accurately detected whether the bearing 10 has undergone deformation exceeding the set value, as compared with the case using the outer rubber set so as to break when the relative displacement amount D exceeds the set value. be able to. Thereby, the presence or absence of damage to the support 10 can also be accurately detected.

  Specifically, as shown in FIGS. 1 and 2, the positions corresponding to the rubber layers 16 on the surfaces 18X and 18Y of the outer rubber 18 are avoided, and only the both end portions 22A of the rubber piece 22 are positioned corresponding to the metal plate 15. Is attached. As shown in FIG. 5, when the support 10 is deformed, the rubber layer 16 is elastically deformed by receiving a shearing force. However, as the amount of deformation of the support 10 increases, the rubber layer swelled outward by the weight of the bridge girder 108. 16 begins to dent inward. For this reason, in order to detect the magnitude of deformation received by the support 10 with high accuracy, the surface 18X, 18Y of the outer rubber 18 corresponding to the metal plate 15 that does not undergo elastic deformation compared to the rubber layer 16 is located. It is preferable that the rubber pieces 22 are attached to the outer rubber 18 by joining both end portions 22A. By doing in this way, the magnitude | size of the deformation | transformation which the support 10 received can be detected correctly, without being influenced by the elastic deformation of the rubber layer 16.

  As shown in FIGS. 1 and 3, since the two rubber pieces 22 are respectively joined to the surfaces 18X and 18Y of the outer rubber 18, the bridge 10 and the bridge pier 106 are moved relative to each other in the horizontal direction. Can detect the X-direction component and the Y-direction component of the magnitude of deformation received. Thereby, the presence or absence of damage to the support 10 can be detected more accurately.

  In the first embodiment, only the two end portions 22A of the rubber piece 22 are joined to the surfaces 18X and 18Y of the outer rubber 18, but all the back surfaces of the rubber pieces 22 are joined to the surfaces 18X and 18Y of the outer rubber 18. It is good also as composition to do.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the damage determination device 40 of the present embodiment includes three rubber pieces 21, 22, and 23 in two sets. The rubber pieces 21 to 23 are joined to the surface 18X and the surface 18Y of the outer rubber 18, respectively.

  Further, the rubber piece 22 of the present embodiment is the same as the rubber piece 22 of the first embodiment, and the relative displacement amount D is also set to the limit displacement amount DL of the support 10.

  As shown in FIG. 8, the rubber pieces 21 and 23 have the same shape as the rubber piece 22, and both end portions 21 </ b> A and 23 </ b> A in the longitudinal direction are joined to the surfaces 18 </ b> X and 18 </ b> Y of the outer rubber 18, respectively. ing. Further, the elongation performance of the rubber pieces 21 and 23 is different from that of the rubber piece 22 and is damaged when the relative displacement D reaches a set value set for each.

  The elongation at break of the rubber piece 21 is set smaller than that of the rubber piece 22, and the rubber piece 21 breaks before the relative displacement D reaches the limit displacement DL.

  The elongation at break of the rubber piece 23 is set larger than that of the rubber piece 22, and after the relative displacement amount D reaches the limit displacement amount DL, the rubber piece 23 breaks. In the present embodiment, the breaking elongation of the rubber piece 23 is set to the maximum value of the displacement amount at which the support 10 is restored to the original state.

Next, the operation of the damage determination device 40 of the second embodiment will be described.
For example, when the bridge pier 106 and the bridge girder 108 are moved relative to each other in the horizontal direction (arrow Y direction in FIG. 7) from the position shown in FIG. 1 due to vibration such as an earthquake, and the relative displacement amount D reaches the limit displacement amount DL,
As shown in FIG. 8, the rubber piece 21 is broken.

  When the relative displacement amount D exceeds the limit displacement amount DL of the rubber piece 22, the rubber piece 22 is broken and the possibility that the bearing 10 is damaged is determined. Further, when the relative displacement amount D exceeds the maximum value of the displacement amount at which the support 10 is restored to the original state, the rubber piece 23 is broken and the support 10 cannot be restored, and replacement or repair is necessary at an early stage. It is judged that.

  Thus, the magnitude | size of the deformation | transformation which the support 10 received can be detected in steps by using the some rubber | gum piece 21,22,23 from which elongation performance differs.

  In the second embodiment, the damage determination device is composed of three types of rubber pieces 21, 22, and 23 having different elongation at break. However, the present invention is not limited to this configuration, and a plurality of types of rubber having different elongation at break. You may comprise by a piece.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 9 and 10, the damage determination apparatus 50 according to the present embodiment is composed of coating films 51, 52, and 53 having elasticity. The coating films 51, 52, and 23 are formed on the surfaces 18X and 18Y of the outer rubber 18 over at least two adjacent (three in the present embodiment) metal plates 15, respectively. The coating films 51, 52, and 53 are made of a silicon-based sealing agent, and breakage (cracking, breakage, etc.) occurs with some deformation.

The elongation performance of the coating film 52 is larger than that of the coating film 51 and smaller than that of the coating film 53, and is set so as to be damaged when the relative displacement amount D exceeds the limit displacement amount DL of the support 10.
The elongation performance of the coating film 51 is set so that the coating film 51 breaks before the relative displacement amount D reaches the limit displacement amount DL.
The elongation performance of the coating film 53 is set so that the coating film 53 breaks after the relative displacement amount D reaches the limit displacement amount DL. In the present embodiment, the elongation performance of the coating film 53 is set to the maximum value of the displacement amount at which the support 10 is restored to the original state.

Next, the operation of the damage determination device 50 according to the third embodiment will be described.
The damage determination device 50 has the same effects as the damage determination device 40 of the second embodiment.
Moreover, since the coating films 51, 52, and 53 can be formed by being applied to the support 10, the attachment work is simplified.

  In addition, the coating films 51, 52, and 53 may be formed of a silicon-based sealing agent having a known elongation performance, or may impart elongation performance to a liquid agent having suitable weather resistance.

[Other Embodiments]
In 1st and 2nd embodiment, it was set as the structure which uses the damage determination apparatus as a rubber piece, However, This invention is not limited to this structure, As a damage determination apparatus, it is a wire member (For example, a fiber (natural fiber, organic fiber, It is also possible to employ a configuration using metal fibers). An example of the configuration in the case of using a wire member will be described. A pair of rubber blocks or the like are bonded to the surface of the outer rubber 18 corresponding to two adjacent metal plates 15 (vulcanization bonding or adhesive). Etc.), and a wire member such as a thread is locked to a locking portion (for example, a hook or a pin) formed on the rubber block. At this time, when the relative displacement amount D is equal to or smaller than a preset value (for example, the limit displacement amount DL), the yarn is in a slack state, and when the relative displacement amount D exceeds the set value, the yarn is broken. Set the length of. By doing in this way, the magnitude | size of the deformation | transformation which the support received can be detected in the state of a thread | yarn.

  In 1st-3rd embodiment, although the shape of the laminated body 14 was made into the square pillar shape, this invention is not limited to this structure, The shape of the laminated body 14 is good also as a polygonal shape or a column shape.

  In the first and second embodiments, the shape of the rubber piece 22 is rectangular, but the present invention is not limited to this configuration, and other shapes may be used. For example, the shape of the rubber piece 22 is as shown in FIG. The longitudinal end portions 22A may be wider than the center portion 22B. Thus, by making the both end portions 22A wider than the central portion 22B, the bonding area between the both end portions 22A and the outer rubber 18 is increased, and the bonding strength between them is improved. As a result, it is possible to prevent the end portion 22A of the rubber piece 22 and the outer rubber 18 from being disconnected when the support 10 is deformed. In the second embodiment, similarly to the rubber piece 22, the rubber pieces 21 and 23 may have a shape in which both end portions 21A and 23A in the longitudinal direction are wider than the central portions 21B and 23B.

  Although the rubber piece of 1st and 2nd embodiment is set as the structure attached ranging over the two adjacent metal plates 15, this invention is not limited to this structure, A rubber piece attaches the several metal plate 15 to it. It is good also as a structure attached ranging.

  In addition, the rubber pieces of the first and second embodiments are configured so as to obtain the blending and vulcanization conditions of the rubber material in advance so that the predetermined elongation performance can be exhibited, and to manufacture based on the information. Is not limited to this configuration, and a rubber piece may be manufactured without setting a predetermined elongation performance. When the rubber piece manufactured in this way is bonded to the surface of the outer rubber 18, the elongation performance of the rubber piece having the same composition of the bonded rubber piece and the rubber material and the same vulcanization conditions is measured. By doing in this way, when the joined rubber piece breaks, it can be easily determined that the bearing 10 has undergone deformation that causes the joined rubber piece to break.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

10 Support 14 Laminate 15 Metal plate (hard plate)
16 Rubber layer (inner elastic member)
18 Outer rubber (outer elastic member)
20 Damage judging device 22 Rubber piece (damage judging member)
22A End 40 Damage judging device 21 Rubber piece (damage judging member)
21A end 22 rubber piece (damage judgment member)
22A End 23 Rubber piece (damage judgment member)
23A End 50 Damage determination device 52 Coating film (damage determination member)
106 Pier (support member)
108 Bridge girder (supported member)
D Relative displacement DL Limit displacement

Claims (7)

A laminated body in which an inner elastic member and a hard plate that is harder than the inner elastic member are alternately laminated and an outer elastic member that covers the outer periphery of the laminated body, disposed between the supporting member and the supported member; A damage determination device for a bearing for determining damage of a bearing that supports the supported member so as to be movable relative to the supporting member,
When attached to the surface of the outer elastic member of the support, straddling at least two adjacent hard plates, and the relative displacement between the support member and the supported member exceeds a preset value A damage determination device for a bearing having a damage determination member that is damaged in a detectable manner. The damage determination member is made of an elastic material,
2. The support according to claim 1, wherein the elongation at break of the damage determination member is smaller than those of the outer elastic member and the inner elastic member, and is set to be broken when the relative displacement exceeds the set value. Damage determination device. A plurality of the damage determination members are attached to the surface of the outer elastic member,
The bearing damage determination device according to claim 1, wherein the set value of the relative displacement amount is individually set for each of the damage determination members.   The bearing damage determination device according to claim 3, wherein one of the plurality of damage determination members has the set value of the relative displacement amount set to a limit displacement amount of the bearing.   The said damage judgment member is elongate, and only the both ends of a longitudinal direction are each attached in the position corresponding to the said hard board of the surface of the said outer side elastic member. Damage determination device for bearing as described in 1. A laminated body in which an inner elastic member and a hard plate that is harder than the inner elastic member are alternately laminated and an outer elastic member that covers the outer periphery of the laminated body, disposed between the supporting member and the supported member; The mounting method of the damage determination apparatus for bearings for attaching the damage determination apparatus for bearings of any one of Claims 1-5 to the support which supports the said supported member so that relative movement with the said supporting member is possible. There,
Detecting the position of the hard plate of the bearing;
A mounting method of a damage determination apparatus for bearing, wherein the damage determination member is attached to the surface of the outer elastic member so as to straddle at least two adjacent hard plates.   A bearing to which the damage determination device for bearing according to any one of claims 1 to 5 is attached.

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