JP2011184936A - Isolator protection device, and method for assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately and homogeneously perform fastening operation of a bolt or nut of an isolator protection device by simple operation while securing the locking effect of the fastened bolt or nut. <P>SOLUTION: The isolator protection device 2 includes a lower flange 9 fixed to an isolator provided between a foundation and a structure on the foundation; an elastic body 20 which is elastically deformed, when the lower flange 9 is displaced in a separating direction, by compressing force with a regulating plate 26; and a bolt 27 which regulates the position of the regulating plate 26 to the foundation. Projections 22 are provided on a first surface 20a and a second surface 20b which are the lower surface and upper surface of the elastic body 20. In a fastening step of the bolt 27, when fastening torque is sharply increased in contact of the first surface 20a with the lower flange 9 and contact of the second surface 20b with the regulating plate 26 by elastic deformation of the projections 22, the fastening step is completed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides an isolation device having a configuration in which an isolator is interposed between a foundation and a structure on the foundation, and an isolator protection device that protects the isolator by reducing a tensile force acting on the isolator, and It relates to the assembly method.

  Among the seismic isolation devices that suppress the shaking of structures (buildings, buildings, bridges, towers, etc.) when an earthquake occurs, in particular, an isolator is interposed between the foundation and the structure on the foundation Some seismic isolation devices have a laminated rubber having a configuration in which a plurality of rubber plates and steel plates are alternately bonded and laminated in the vertical direction as an isolator.

  This laminated rubber has a high strength against the compressive force in the vertical direction, but conversely has a property that it is weak against a tensile force in the vertical direction. For this reason, when a large tensile force acts on the laminated rubber due to the shaking of the earthquake, peeling or voids are generated between the rubber plate and the steel plate, which may reduce the seismic isolation performance of the laminated rubber.

For this reason, when designing a seismic isolation device in general, the tensile force acting on the laminated rubber against the shaking of the earthquake is such that peeling and voids do not occur between the rubber plate and the steel plate (for example, 1 N / mm ² or less). Specifically, for example, measures such as increasing the diameter of the laminated rubber have been conventionally performed, but this causes a problem that the seismic isolation performance against the earthquake is lowered.

  As an example of the prior art that can solve such a problem, the diameter of the laminated rubber is not increased, but, for example, a rubber sheet, a bar spring, a dish or the like is provided between the head of the mounting bolt and the flange of the laminated rubber. 2. Description of the Related Art Seismic isolation devices having a configuration that reduces a tensile force acting on laminated rubber by interposing a buffer seat such as a spring are known (see, for example, Patent Documents 1 to 5).

  Further, Patent Document 6 discloses an isolator protection device that protects an isolator by reducing an upward and downward tensile force acting on the isolator. The isolator protection device includes an elastic body that relatively elastically displaces the isolator and the foundation in the separation direction, and the separation direction of the isolator and the foundation so that the elastic body does not deform beyond the elastic limit. An elastic deformation amount regulating member that regulates the amount of relative elastic displacement of the elastic member, and the elastic body is elastically deformed within a predetermined range so that the vertical pulling force acting on the isolator is reduced. It has become.

JP-A-11-153191 JP 2001-124142 A JP-A-10-110551 JP 2000-240072 JP 2003-194146 A Japanese Patent No. 4330171

  By the way, the isolator protection device described in Patent Document 6 has the following technical problems. Hereinafter, this technical problem will be described with reference to FIG. FIG. 11 is a diagram schematically showing the configuration of the isolator protection device described in Patent Document 6. As shown in FIG.

  11, reference numeral 100 denotes an isolator protection device according to the prior art, reference numeral 101 denotes a foundation, and reference numeral 102 denotes a lower flange fixed to the isolator not shown in FIG.

  Reference numeral 103 denotes a rubber elastic body provided between the lower flange 102 and the circular steel plate 104. When a pulling force acts on the isolator due to the shaking of the structure due to an earthquake, the lower flange 102 is lifted from the foundation 101. The floating is regulated by deformation of the rubber elastic body 103. Reference numeral 105 denotes a steel pipe (regulating member) that regulates the amount of lifting of the lower flange 102, that is, the amount of deformation of the rubber elastic body 103.

  In such an isolator protection device according to the prior art, the circular steel plate 104 is positioned by tightening a nut 107 that is screwed into a bolt 106 planted in the foundation 101 during assembly work. Yes. However, since the rubber elastic body 103 is compressed and deformed during the tightening operation, it is difficult for the operator to know at which point the tightening should be completed.

  As a result, the tightening amount becomes too large, and the rubber elastic body 103 is elastically deformed more than necessary from the beginning, and the tensile force acting on the isolator due to the shaking in the event of an earthquake cannot be reduced appropriately. There is. Moreover, there is a possibility that the uniformity of performance cannot be maintained due to variations in the tightening amount. On the other hand, if the tightening amount of the nut 107 is reduced, the bolt 106 may be loosened.

  In order to prevent the occurrence of such problems, for example, it is conceivable to use a tool with an appropriate and constant bolt (or nut) tightening amount. In this case, however, the tool must be transported or installed. Therefore, the work becomes complicated.

  In order to prevent the nut 107 from being loosened, for example, when a dedicated loosening washer is provided between the rubber elastic body 103 and the circular steel plate 104, the circular steel plate 104, the nut 107, and the bolt 106 are provided. The position becomes higher and the isolator protection device 100 has to be further separated from the isolator, that is, the seismic isolation device as a whole may be increased in size.

  Accordingly, the present invention has been made in view of such a situation, and an object of the present invention is to facilitate workability, perform bolt and nut tightening work of the isolator protection device appropriately and uniformly, and loosen the bolt or nut after tightening. An object of the present invention is to provide an isolator protection device capable of obtaining a stopping effect without causing an increase in the size of the entire seismic isolation device.

  In order to solve the above-mentioned problem, a first aspect of the present invention is fixed to the isolator in a seismic isolation device in which an isolator is interposed between a foundation and a structure on the foundation, and a tensile force is applied to the isolator. When the plate material is displaced in the separation direction relative to the foundation or the structure together with the isolator, and to the foundation or the structure when the plate material is displaced in the separation direction And an elastic body that is elastically deformed by receiving a compressive force with a restricting portion provided in a fixed manner, and provided on the foundation or the structure, and defines a position of the restricting portion relative to the foundation or the structure. A bolt, and at least one of a first surface facing the plate member and a second surface facing the regulating portion in the elastic body, the first surface Alternatively, characterized in that it comprises a projection projecting from said second surface.

  According to this aspect, at least one of the first surface of the elastic body that faces the plate member and the second surface of the elastic body that faces the restricting portion is provided on the first surface or the second surface. A protrusion protruding from the surface is provided. For example, in the case where the protrusion is provided on the first surface, with the tightening of a bolt or a nut screwed to the bolt, first, the elastic deformation of the protrusion, or the local elasticity of the elastic body A certain increase in the tightening torque occurs due to deformation (not global deformation of the elastic body but local deformation as long as the protrusion sinks) or both elastic deformations (hereinafter, This stage is called “initial stage of tightening”).

  After that, the first surface and the plate material come into contact with each other, and the tightening torque is remarkably increased from the initial tightening stage. That is, in the initial tightening stage, the tightening torque of the bolt or nut is relatively small. However, when the first surface and the plate material come into contact with each other, the tightening torque is clearly increased. The bolt or nut tightening operation can be completed at an opportunity.

  In other words, it is possible to easily know when the appropriate tightening operation of the bolt or nut is completed, and it is possible to perform the bolt or nut tightening operation appropriately and homogeneously with ease of workability without the need for a separate tool or the like. Can do. Further, it is possible to prevent the elastic body from being deformed as a whole when the bolt or nut tightening operation is completed, and to obtain appropriate initial characteristics.

  In addition, at the stage of completing the bolt or nut tightening operation, a predetermined repulsive force accompanying elastic deformation of at least one of the protrusion and the elastic body is exhibited. For this reason, it can prevent that a volt | bolt or a nut loosens with progress of time (loosening prevention effect). In addition, there is no need to interpose a dedicated locking member between the elastic body and the restricting portion, and the protrusions are sufficiently elastically deformed, so that the height dimension does not increase as an isolator protection device, and the seismic isolation device As a whole, an increase in size can be avoided.

  According to a second aspect of the present invention, in the first aspect, the elastic body and the protrusion are integrally formed by a molding process using an elastic material.

  According to this aspect, since the elastic body and the protrusion are integrally formed, the assembling operation of the isolator protection device can be performed more easily.

  According to a third aspect of the present invention, in the first or second aspect, the elastic body has a ring shape surrounding the bolt, and the projection has the ring shape. Alternatively, the second surface is formed in a rib shape so as to extend in the circumferential direction.

  According to this aspect, since the projection is formed in a rib shape so as to extend in the circumferential direction, the above-described locking prevention effect by the projection after tightening the bolt or nut is evenly exhibited in the circumferential direction. The

  According to a fourth aspect of the present invention, in the first or second aspect, the protrusions are arranged so as to be scattered on the first surface or the second surface.

  According to this aspect, since the protrusions are arranged so as to be scattered on the first surface or the second surface, the above-described loosening prevention effect by the protrusions after tightening the bolts or nuts is the first surface or It is exhibited evenly over the entire second surface.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the elastic body includes an elastic deformation amount regulating member that regulates an elastic deformation amount so that the elastic body does not deform beyond an elastic limit. It is characterized by being.

  According to this aspect, since the elastic deformation amount regulating member for regulating the deformation amount at the time of elastic deformation is provided so that the elastic body does not deform beyond the elastic limit, the vertical direction acting on the isolator in the event of an earthquake Therefore, it is possible to reliably prevent the deformation of the elastic body beyond the elastic limit due to the pulling force and excessive distortion or the like. Thereby, it is possible to prevent the elastic body from being damaged or the like by a vertical pulling force acting on the isolator in the event of an earthquake.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the elastic body has a ring shape that surrounds the bolt, and an inner diameter thereof is that of the first surface. It is formed so that it may become large toward the said 2nd surface side from the side.

  According to this aspect, the elastic body has a ring shape surrounding the bolt, and an inner diameter thereof increases from the first surface side toward the second surface side. Therefore, when the elastic body is compressed and deformed, a region for inflating the inner side is secured, thereby preventing the elastic body from being pressed and damaged to the components existing inside the elastic body.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the elastic body has a ring shape surrounding the bolt, and an outer diameter of the elastic body is the first surface. It is formed so that it may become small toward the said 2nd surface side from this side.

  According to this aspect, the elastic body has a ring shape surrounding the bolt, and its outer diameter decreases from the first surface side toward the second surface side. Therefore, the area occupied on the second surface side outside the elastic body can be reduced, so that a component (for example, an isolator) existing outside the elastic body is pressed against the isolator protection device. It can be prevented from being damaged.

  The eighth aspect of the present invention is fixed to the isolator in a seismic isolation device in which an isolator is interposed between a foundation and a structure on the foundation, and together with the isolator when a tensile force acts on the isolator. A plate material that is displaceable in the separation direction relative to the foundation or the structure, and a restriction that is fixedly provided to the foundation or the structure when the plate material is displaced in the separation direction. A first elastic body that is elastically deformed by receiving a compressive force with a portion, and a bolt that is provided on the foundation or the structure and defines a position of the restricting portion with respect to the foundation or the structure, Between the first surface facing the plate material and the plate material in the first elastic body, and between the second surface facing the restriction portion and the restriction portion in the first elastic body, A second elastic body is provided on at least one of the bolts, and at least one of deformation of the second elastic body and local deformation of the first elastic body accompanying tightening of the bolt or a nut screwed to the bolt. The first surface where the second elastic body is interposed and the plate material are in contact with each other, or the second surface where the second elastic body is interposed and the restriction portion are in contact, or both It is characterized by having a configuration in which contact is made.

  According to this aspect, between the first surface facing the plate material in the first elastic body and the plate material, and in the first elastic body, the second surface facing the restriction portion and the restriction portion, A second elastic body is provided on at least one of these. And, for example, when the second elastic body is provided between the first surface and the plate material, the bolts or nuts to be screwed with the bolts are first tightened with the second elastic body. By elastic deformation, or by local elastic deformation of the first elastic body (local deformation as long as the second elastic body sinks, not global deformation of the first elastic body), or Both elastic deformations cause a certain increase in tightening torque (initial stage of tightening).

  After that, the first surface and the plate material come into contact with each other, and the tightening torque is remarkably increased from the initial tightening stage. That is, in the initial tightening stage, the tightening torque of the bolt or nut is relatively small. However, when the first surface and the plate material come into contact with each other, the tightening torque is clearly increased. The bolt or nut tightening operation can be completed at an opportunity.

  In other words, it is possible to easily know when the appropriate tightening operation of the bolt or nut is completed, and it is possible to perform the bolt or nut tightening operation appropriately and homogeneously with ease of workability without the need for a separate tool or the like. Can do. In addition, it is possible to prevent the entire elastic deformation of the first elastic body when the bolt or nut tightening operation is completed, and to obtain appropriate initial characteristics.

  In addition, a predetermined repulsive force accompanying elastic deformation of at least one of the second elastic body and the first elastic body is exhibited at the completion stage of the bolt or nut tightening operation. For this reason, it can prevent that a volt | bolt or a nut loosens with progress of time (loosening prevention effect).

  According to a ninth aspect of the present invention, in the eighth aspect, the hardness of the second elastic body is lower than the hardness of the first elastic body.

  According to this aspect, since the hardness of the second elastic body is lower than the hardness of the first elastic body, the first elastic body loses the second elastic body first in the initial tightening stage of the bolt or nut. The elastic deformation can be prevented, and the initial characteristics of the first elastic body can be obtained more appropriately.

A tenth aspect of the present invention is an assembling method of an isolator protection device for protecting the isolator in a seismic isolation device in which an isolator is interposed between a foundation and a structure on the foundation,
A plate member fixed to the isolator and capable of being displaced relative to the base or the structure together with the isolator when a tensile force is applied to the isolator; and the base or the structure An elastic body that is elastically deformed by receiving a compressive force between the plate material and the restricting portion when the plate material is displaced in the separation direction between the restricting portion that is fixedly provided to the restricting portion. A step of constructing a configuration to be arranged, and a step of tightening a bolt provided on the foundation or the structure and defining a position of the restricting portion relative to the foundation or the structure or a nut screwed with the bolt. A front surface provided on at least one of the first surface facing the plate member and the second surface facing the regulating portion in the elastic body; The projection protruding from the first surface or the second surface is elastically deformed, and the first surface on which the projection is interposed and the plate material are in contact with each other, or the second surface on which the projection is interposed and the restriction And a step of completing the tightening of the bolt or nut when triggered by an increase in the tightening torque of the bolt or nut when the two parts are in contact with each other. .

  According to this aspect, as described in the first aspect, the tightening torque of the bolt or nut is relatively small at the initial stage of tightening, but when the first surface and the plate material come into contact with each other, the tightening torque Becomes larger. Therefore, the tightening operation of the bolt or nut can be completed in response to such a sudden increase in the tightening torque (you can know when the proper tightening operation is completed), and there is no need to prepare a tool or the like separately. The work of tightening bolts or nuts can be performed appropriately and uniformly with ease of workability. In addition, when the bolt or nut tightening operation is completed, the protrusion is sufficiently deformed and exhibits a predetermined repulsive force, so that the bolt or nut is prevented from loosening over time. Can do.

The front view which shows typically the structure of the seismic isolation apparatus which concerns on this invention. Sectional drawing which expands and schematically shows a part of structure of the seismic isolation apparatus which concerns on this invention. Sectional drawing which shows typically the isolator protection apparatus (before elastic body deformation | transformation) which concerns on 1st Embodiment of this invention. Sectional drawing which shows typically the isolator protection apparatus (after elastic-body deformation | transformation) which concerns on 1st Embodiment of this invention. Sectional drawing of the isolator protection apparatus (before bolt fastening) which concerns on 1st Embodiment of this invention. (A) is a top view of an elastic body, (B) is AA sectional drawing of (A). Sectional drawing of the isolator protection apparatus (after bolting) which concerns on 1st Embodiment of this invention. (A-1) to (A-3) are cross-sectional views showing other embodiments of “projections”, and (B-1) to (B-3) are respectively (A-1) to (A-3). Corresponding plan view. Sectional drawing which expands and schematically shows a part of structure of the seismic isolation apparatus which concerns on this invention. It is a figure which shows other embodiment of a processus | protrusion, (A) is before a processus | protrusion deformation | transformation, (B) is a figure which shows an after-projection deformation | transformation typically. Sectional drawing which shows typically the isolator protection apparatus which concerns on a prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view schematically showing the configuration of the seismic isolation device 1 according to the present invention, and FIG. 2 is a cross-sectional view schematically showing an enlarged part thereof. 3 and 4 are cross-sectional views schematically showing the isolator protection device 2 according to the first embodiment of the present invention. FIG. 3 shows a state before the elastic body 20 is deformed, and FIG. The state after the deformation is shown respectively.

  5 and 7 are cross-sectional views of the isolator protection device 2 according to the first embodiment of the present invention. FIG. 5 shows a state before the bolt 27 is tightened (before the protrusion 22 is deformed), and FIG. The state after tightening 27 (after the deformation of the projection 22) is shown.

  In addition, FIG. 6A is a plan view of the elastic body 20, FIG. 6B is a cross-sectional view taken along line AA in FIG. 6A, and FIGS. Sectional drawing which shows other embodiment of (B-1)-(B-3) is a top view corresponding to (A-1)-(A-3), respectively. 9 is a cross-sectional view schematically showing an enlarged part of the structure of the seismic isolation device 1, FIG. 10 is a view showing another embodiment of the protrusion 22, and FIG. 9A is a deformation of the protrusion 22D. (B) is a diagram schematically showing the state after the deformation.

  1 to 4, 9, and 10 schematically show the shape, structure, and the like of the seismic isolation device and the isolator protection device, but each of the isolator protection device and the device shown in FIGS. The components are precisely drawn with respect to their shapes, aspect ratios, etc., almost exactly the same as the actual design drawings (however, the scale ratio of the drawings is not 1: 1).

<< Overview of Seismic Isolation Device 1 >>
In FIG. 1, the seismic isolation device 1 has a configuration in which a plurality of laminated rubbers 14 as “isolators” are interposed between a foundation (footing) 6 constructed on the ground and a structure 5 such as a building. The laminated rubber 14 has a configuration in which a plurality of substantially disc-shaped rubber plates and steel plates are alternately bonded and laminated in the vertical direction. As for the shaking of the ground due to the earthquake, the shaking of the foundation 6 is absorbed by the laminated rubber 14, thereby reducing the shaking of the structure 5 on the laminated rubber 14.

  At this time, when the structure 5 swings in the left-right G direction due to the shaking of the earthquake, a vertical compression force F1 acts on a part of the plurality of laminated rubbers 14, and a vertical pulling force F2 acts on the other part. Act. However, in the seismic isolation device 1 according to the present invention, a plurality of isolator protection devices 2 that reduce the tensile force F <b> 2 and prevent damage to the laminated rubber 14 are provided for each laminated rubber 14.

  FIG. 2 shows a state of the seismic isolation device 1 in which the pulling force F2 is applied in FIG. In the seismic isolation device 1, the lower flange 9 as a “plate material” fixed to the lower portion of the laminated rubber 14 is separated from the recess 10 a of the base plate 10 provided on the foundation 6 through the isolator protection device 2. The engagement is relatively displaceable.

  As shown in FIG. 2, when a tensile force F2 is applied to the laminated rubber 14, the lower flange 9 fixed to the lower part of the laminated rubber 14 is displaced in a direction away from the base plate 10 (base 6). During this displacement, the elastic body 20 as the “first elastic body” of the isolator protection device 2 is compressed and deformed, whereby the tensile force F2 acting on the laminated rubber 14 is reduced.

  In the present embodiment, the upper flange 13 is provided on the upper part of the laminated rubber 14, and the upper flange 13 is fixed to the structure 5 with bolts 28, but the isolator protection device 2 is the same as the lower side of the laminated rubber 14. It is also possible to engage the upper flange 13 with the structure 5 via. In contrast to FIG. 2, the lower flange 9 may be fixedly provided to the foundation 6, and the upper flange 13 may be engaged with the structure 5 via the isolator protection device 2.

<< First Embodiment of Isolator Protection Device >>
Next, the configuration and operational effects of the isolator protection device 2 according to the first embodiment of the present invention will be further described in detail. The plurality of isolator protection devices 2 provided on the base 6 side have the same configuration and function.

  3 and 4, the isolator protection device 2 is fixed to the laminated rubber 14, and is displaced relative to the foundation 6 together with the laminated rubber 14 when a tensile force F <b> 2 is applied to the laminated rubber 14. Elastic deformation by receiving a compressive force between the possible lower flange 9 and a regulating plate 26 as a “regulating portion” fixedly provided to the foundation 6 when the lower flange 9 is displaced in the separating direction. And the bolt 27 provided on the foundation 6 and defining the position of the restriction plate 26 with respect to the foundation 6.

  More specifically, a base plate 10 is embedded in the foundation 6, and a bolt insertion hole (reference numeral 10 b) is provided in the base plate 10 and the lower flange 9 that is non-fixedly held with respect to the base plate 10 (and the foundation 6). , 9a, respectively). The bolt 27 is inserted into the bolt insertion holes 9 a and 10 b formed in the lower flange 9 and the base plate 10, and the tip of the bolt 27 is screwed into the bolt fitting hole 6 a provided in the foundation 6. ing. Since the lower flange 9 needs to be displaceable along the longitudinal axis direction of the bolt 27, the screw portion of the bolt 27 is not formed at least in a sliding region with the lower flange 9, and the insertion hole The inner diameter of 9a is formed with a margin from the outer diameter of the bolt 27 (the outer diameter of the non-threaded portion).

  An elastic body 20 having a ring shape and a steel pipe 25 as an “elastic deformation amount restricting member” are placed on the upper portion of the lower flange 9, and a bolt 27 is inserted through the elastic body 20 and the steel pipe 25. It has become. As shown in the figure, the steel pipe 25 is held inside the elastic body 20, and the steel pipe 25 needs to be displaceable along the longitudinal axis direction of the bolt 27. Is formed with a margin from the outer diameter of the bolt 27 (the outer diameter of the threaded portion).

  With the above configuration, when the bolt 27 is tightened, the flange portion 27a of the bolt 27 pushes down the restriction plate 26, that is, the position of the restriction plate 26 with respect to the foundation 6 by tightening the bolt 27 (particularly the position in the direction away from the foundation 6). Is to be specified.

  In the isolator protection device 2 having such a configuration, when a tensile force F2 is applied to the laminated rubber 14 as described with reference to FIG. 1, as shown in the change from FIG. 3 to FIG. The lower flange 9 fixed to the lower portion is displaced in a direction away from the base plate 10 (base 6). During this displacement, in the isolator protection device 2, the distance between the lower flange 9 and the restriction plate 26 becomes narrower, whereby the elastic body 20 disposed between the lower flange 9 and the restriction plate 26 becomes As shown in FIG. 4, the lower flange 9 and the restriction plate 26 are compressed and deformed by compression.

In this way, the isolator protection device 2 can absorb and reduce the tensile force F2 in the vertical direction acting on the laminated rubber 14 in the event of an earthquake by compressive deformation of the elastic body 20, so that the allowable range for the laminated rubber 14 is reduced. It is possible to prevent a vertical pulling force (for example, a pulling force of 1 N / mm ² or more) from exceeding. Accordingly, it is possible to prevent peeling or voids between the rubber plate and the steel plate constituting the laminated rubber 14 by the tensile force, so that the laminated rubber 14 is protected from the tensile force in the event of an earthquake. can do.

  Further, as described above, the cylindrical steel pipe 25 is disposed between the lower flange 9 and the restriction plate 26 while being inserted into the bolt 27 on the inner peripheral surface side of the cylindrical elastic body 20. Has been. Therefore, the relative displacement position between the laminated rubber 14 and the foundation 6 is lower at both ends in the axial direction of the steel pipe 25 between the lower flange 9 and the restriction plate 26 that become narrower with the displacement in the separating direction. When the flange 9 and the restriction plate 26 are in contact with each other, further elastic displacement in the separating direction is restricted. The steel pipe 25 is set to have an axial length shorter than that of the elastic body 20.

  That is, in the isolator protection device 2 according to the present embodiment, the relative elastic displacement position of the laminated rubber 14 and the base 6 in the separation direction is restricted by the axial length of the steel pipe 25, thereby moving in the separation direction. Therefore, the compression deformation of the elastic body 20 that is compressed with the displacement is restricted.

  Therefore, if the axial length of the steel pipe 25 is appropriately set according to the axial length and elastic characteristics of the elastic body 20, it is possible to prevent the elastic body 20 from undergoing compressive deformation exceeding the elastic limit. . Thereby, it is possible to reliably prevent the deformation of the elastic body 20 from exceeding the elastic limit due to the vertical pulling force acting on the laminated rubber 14 in the event of an earthquake. It is possible to prevent the occurrence of buckling and the like from being damaged.

At the same time, since the deformation of the elastic body 20 is restricted by the steel pipe 25, it is not necessary to give the elastic body 20 high strength. Thereby, the range of selection of the elastic material used for the elastic body 20 is widened, and it is possible to use the elastic body 20 made of an inexpensive rubber material, for example, instead of an expensive elastic body such as a large and strong disc spring. Therefore, it is possible to easily realize the isolator protection device 2 for the laminated rubber 14 at a low cost.
Although the steel pipe 25 is provided inside the elastic body 20 in this embodiment, a steel pipe having a diameter larger than that of the elastic body 20 is used, and the elastic deformation amount of the elastic body 20 is regulated by being provided outside the elastic body 20. You may comprise so that it may do.

  When the elastic body 20 is compressed and deformed between the lower flange 9 and the regulating plate 26, the elastic body 20 swells in a direction orthogonal to the compression direction as shown in the change from FIG. 3 to FIG. I will try again. At this time, if the inner peripheral surface 20d of the elastic body 20 (see FIGS. 5, 7, and 6B) is pressed against the steel pipe 25, the elastic body 20 may be damaged. For this reason, the elastic body 20 is provided with a taper angle α (FIG. 6B) on the inner peripheral surface 20 d, thereby securing a bulging region when the elastic body 20 is compressed and deformed. The inner peripheral surface 20d is prevented from being pressed against the steel pipe 25, or the degree of the pressure contact is reduced.

  Further, regarding the outer peripheral surface 20c of the elastic body 20, when the outer diameter of the upper part is particularly large, the laminated rubber 14 interferes with the isolator protection device 2 when the laminated rubber 14 is deformed in the lateral direction as shown by the region S in FIG. There is a risk of damaging the rubber 14. For this reason, the outer peripheral surface 20c of the elastic body 20 is also provided with a taper angle β (FIG. 6B), thereby reducing the upper occupied area and avoiding interference with the laminated rubber 14.

  The material, shape, dimensions, etc. of each component (elastic body 20, steel pipe 25, bolt 27, restriction plate 26, lower flange 9, etc.) described above are the conditions such as the size and characteristics of the laminated rubber 14 in the seismic isolation device 1. In addition, it can be appropriately determined according to various other conditions.

  The elastic body 20 may be, for example, natural rubber, urethane rubber, butadiene rubber, nitrile rubber, hydrogenated nitrile rubber, non-brene, silicon rubber, styrene butadiene rubber, butyl rubber, isobrene rubber, chlorobrene rubber, ethylene / blobylene rubber, A wide variety of rubber materials such as sulfurized rubber, acrylic rubber, epichlorohydrin rubber, fluorine rubber, chlorosulfonated polyethylene, and other elastic bodies can be applied.

  Next, the protrusion 22 as the “second elastic body” formed on the elastic body 20 will be described. As shown in FIGS. 5 and 6B, the protrusion 22 faces between the first surface 20 a facing the lower flange 9 and the lower flange 9 in the elastic body 20 and faces the regulating plate 26 in the elastic body 20. It is provided on at least one of the second surface 20b and the regulation plate 26. In addition, in this embodiment, although provided in both the 1st surface 20a and the 2nd surface 20b, you may provide only in any one.

  In the present embodiment, the protrusion 22 is integrally provided with the elastic body 20 by, for example, rubber molding. As shown in FIG. 6A, each of the first surface 20a and the second surface 20b in a plan view. It is formed with an area sufficiently smaller than the area, and is formed so as to protrude from each of the first surface 20a and the second surface 20b. In FIG. 6A, the projection 22 is shown in a solid color in order to clearly show the region where the projection 22 is formed.

  In the present embodiment, the protrusion 22 is formed in a rib shape extending in the circumferential direction in plan view as shown in FIG. 6A on each of the first surface 20a and the second surface 20b formed in a ring shape. In a cross-sectional view, it is formed to have a semicircular projection shape as shown in FIG. 6 (B).

  The protrusion 22 formed in this way has the following effects. FIG. 5 shows a state before the bolt 27 is tightened, that is, a state in which the regulating plate 26 is placed on the elastic body 20 by its own weight and the elastic body 20 is not receiving a pressing force from the bolt 27. The assembling process of the isolator protection device 2 includes a process of constructing the configuration shown in FIG. 5 before the tightening process of the bolt 27.

  In this state, the presence of the protrusion 22 forms a gap d1 (= projection amount of the protrusion 22) between the first surface 20a of the elastic body 20 and the upper surface of the lower flange 9, and similarly the second of the elastic body 20 A gap d <b> 2 (= projection amount of the protrusion 22) is formed between the surface 20 b and the lower surface of the restriction plate 26.

  When the bolt 27 is tightened from this state, the protrusion 22 is elastically deformed in the initial tightening stage. The elastic deformation of the protrusion 22 at the initial stage of tightening increases the tightening torque T of the bolt 27 to some extent, but the elastic deformation of the elastic body 20 is hardly accompanied, and the degree of increase of the tightening torque T is slight. .

  Then, when the bolt 27 is tightened, the elastic deformation of the protrusion 22 is completed as shown in FIG. 7, and the first surface 20a of the elastic body 20 and the upper surface of the lower flange 9 come into contact with each other. The two surfaces 20b and the lower surface of the regulating plate 26 come into contact with each other.

  In this state, since the tightening torque T of the bolt 27 clearly increases rapidly, the tightening operator of the bolt 27 comes into contact with the first surface 20a of the elastic body 20 and the upper surface of the lower flange 9, and the elastic body 20 The contact between the second surface 20b and the lower surface of the restricting plate 26 can be easily detected by a sudden increase in the tightening torque T.

  In other words, the bolt tightening operation can be completed with such a clear increase in the bolt tightening torque T. In other words, it is possible to easily know when the appropriate bolt tightening operation is completed, and a tool and the like are prepared separately. Therefore, it is possible to perform the bolt tightening work appropriately and uniformly with ease of workability.

  When the bolt tightening operation is completed, the elastic body 20 is not accompanied by an overall elastic deformation, and the initial characteristics of the elastic body 20 required in the isolator protection device 2 can be appropriately exhibited. Depending on the hardness of the elastic body 20, not only the elastic deformation of the protrusion 22 but also the local deformation of the main body of the elastic body 20 occurs, that is, the protrusion 22 sinks into the elastic body 20. However, this is only a local deformation and hardly causes an overall elastic deformation of the elastic body 20 main body.

  In addition, when the bolt tightening operation is completed, the protrusion 22 is sufficiently deformed and exhibits a predetermined repulsive force. For this reason, it can prevent that the volt | bolt 27 loosens with progress of time. In addition, it is not necessary to interpose a dedicated locking washer between the elastic body 20 and the regulating plate 26, and the protrusion 22 is sufficiently elastically deformed, so that the height of the isolator protection device 2 is large. In addition, an increase in the size of the seismic isolation device 1 as a whole can be avoided.

<< Other Embodiments of Isolator Protection Device >>
Next, another embodiment of the isolator protection device, more specifically, another embodiment of the protrusion 22 will be described.
The protrusion 22 extends in a rib shape along the circumference as described in the first embodiment, and the first protrusion 22 of the elastic body 20 as shown in FIGS. 8B-1 to 8B-3. It can also be provided so as to be scattered over the entire surface 20a or the second surface 20b.

  At that time, the cross-sectional shape of the protrusion 22 can be formed in a hemispherical shape like the protrusion 22A shown in FIG. 8A-1 or a cylindrical shape like the protrusion 22B shown in FIG. 8A-2. Alternatively, it can be formed in a cylindrical shape like a protrusion 22C shown in FIG.

  Further, in the above-described embodiment, the protrusion 22 is formed integrally with the elastic body 20, but may be formed separately. FIG. 10 shows an example of such an embodiment. FIG. 10 (A) shows a state before bolt tightening, and FIG. 10 (B) shows a state after bolt tightening. In the present embodiment, the protrusion 22D has a shape extending along the circumferential direction as shown in FIG. 6A, but is separate from the elastic body 20 ′. It has a variety of forms.

  The elastic body indicated by reference numeral 20 'is formed with a recess 20e along the circumferential direction so that the protrusion 22D can be fitted exactly, and the protrusion 22D is retained by fitting the protrusion 22D into the recess 20e. It is supposed to be done.

  In such a separate structure of the protrusion 22D and the elastic body 20 ', the respective hardnesses can be set to the same, and different materials can be used to form different hardnesses. As an example, the hardness of the protrusion 22D can be made lower than the hardness of the elastic body 20 '.

  In such a configuration, in the process from the state before bolt tightening in FIG. 10A to the state after bolt tightening in FIG. 10B, the elastic body 20 ′ loses to the protrusion 22D at the initial stage of bolt tightening. The preferential deformation of the protrusion 22D is reliably performed without elastic deformation first. For this reason, deformation of the elastic body 20 ′ can be suppressed at the time of completion of bolt tightening, and the initial characteristics of the elastic body 20 ′ (isolator protection device) can be appropriately obtained.

  However, it goes without saying that the effect of the present invention can be obtained even if the hardness of the protrusion 22D is higher than the hardness of the elastic body 20 '. In particular, even when the protrusion 22D is formed of a rigid body, the above-described effects of the present invention can be obtained by local elastic deformation of the elastic body 20 '.

  The embodiments described above do not limit the present invention, and various modifications can be made with respect to combinations of components, shapes, materials, and the like of the components. In particular, in this embodiment, the steel pipe 25 (elastic deformation amount regulating member) that regulates the elastic deformation amount of the elastic body 20 is provided. However, even if the structure is not provided, the above-described effect of the protrusion 22 can be obtained. Can do.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Isolator protection device 5 Structure 6 Base 9 Lower flange 10 Base plate 10a Recess 13 Upper flange 14 Isolator (laminated rubber)
20 Elastic body (first elastic body)
20a 1st surface 20b 2nd surface 22 Protrusion (2nd elastic body)
25 Steel pipe (regulation member)
26 Restriction plate 27, 28 bolt

Claims (10)

It is fixed with respect to the isolator in the seismic isolation device in which the isolator is interposed between the foundation and the structure on the foundation, and when the tensile force acts on the isolator, the isolator and the foundation or the structure A relatively displaceable plate material,
An elastic body that is elastically deformed by receiving a compressive force between the base member or a restricting portion that is fixedly provided to the structure when the plate material is displaced in the separation direction;
A bolt that is provided on the foundation or the structure, and that defines a position of the restricting portion with respect to the foundation or the structure;
A protrusion projecting from the first surface or the second surface is provided on at least one of the first surface facing the plate material and the second surface facing the restricting portion in the elastic body. Yes,
An isolator protection device. The isolator protection device according to claim 1, wherein the elastic body and the protrusion are integrally formed by a molding process using an elastic material.
An isolator protection device. The isolator protection device according to claim 1 or 2, wherein the elastic body has a ring shape surrounding the bolt,
The protrusion is formed in a rib shape so as to extend in the circumferential direction on the first surface or the second surface forming a ring shape,
An isolator protection device. The isolator protection device according to claim 1 or 2, wherein the protrusions are arranged so as to be scattered on the first surface or the second surface.
An isolator protection device. The isolator protection device according to any one of claims 1 to 4, further comprising an elastic deformation amount regulating member that regulates an elastic deformation amount so that the elastic body does not deform beyond an elastic limit.
An isolator protection device. The isolator protection device according to any one of claims 1 to 5, wherein the elastic body has a ring shape surrounding the bolt, and an inner diameter of the elastic body from the first surface side. It is formed to become larger toward the second surface side,
An isolator protection device. The isolator protection device according to any one of claims 1 to 6, wherein the elastic body has a ring shape surrounding the bolt, and an outer diameter of the elastic body from the side of the first surface. It is formed so as to become smaller toward the second surface side,
An isolator protection device. It is fixed with respect to the isolator in the seismic isolation device in which the isolator is interposed between the foundation and the structure on the foundation, and when the tensile force acts on the isolator, the isolator and the foundation or the structure A relatively displaceable plate material,
A first elastic body that is elastically deformed by receiving a compressive force between the plate member and a restricting portion fixed to the foundation or the structure when the plate material is displaced in the separation direction;
A bolt that is provided on the foundation or the structure, and that defines a position of the restricting portion with respect to the foundation or the structure;
At least one of the first surface that faces the plate material and the plate material in the first elastic body, and the second surface that faces the restriction portion and the restriction portion in the first elastic body. A second elastic body is provided on either side,
The second elastic body is interposed via at least one of the deformation of the second elastic body and the local deformation of the first elastic body accompanying tightening of the bolt or a nut screwed with the bolt. The first surface and the plate material are in contact with each other, or the second surface in which the second elastic body is interposed and the restriction portion are in contact with each other, or the both are contacted.
An isolator protection device. The isolator protection device according to claim 8, wherein the hardness of the second elastic body is lower than the hardness of the first elastic body.
An isolator protection device. An assembly method of an isolator protection device for protecting the isolator in a seismic isolation device in which an isolator is interposed between a foundation and a structure on the foundation,
A plate member fixed to the isolator and capable of being displaced relative to the base or the structure together with the isolator when a tensile force is applied to the isolator; and the base or the structure An elastic body that is elastically deformed by receiving a compressive force between the plate material and the restricting portion when the plate material is displaced in the separation direction between the restricting portion that is fixedly provided to the restricting portion. Building a configuration to be deployed; and
A step of tightening a bolt provided on the foundation or the structure and defining a position of the restricting portion relative to the foundation or the structure or a nut screwed with the bolt;
Protrusions protruding from the first surface or the second surface, provided on at least one of the first surface facing the plate material and the second surface facing the restricting portion in the elastic body. Is elastically deformed, and when the first surface where the protrusion is interposed and the plate material are in contact, or when the second surface where the protrusion is interposed and the restriction portion are in contact, or both Completing the tightening of the bolt or nut triggered by an increase in tightening torque of the bolt or nut when contact is made; and
A method for assembling an isolator protection device.

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