JP2007063843A - Elastic bearing body for structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic bearing body for a structure which has recesses and protrusions therein, and facilitates the checking of the normality or soundness thereof. <P>SOLUTION: The elastic bearing body is formed of an upper shoe 12 secured to a superstructure 101, a lower shoe 13 secured to an under structure, and a rubber layer 14 interposed between the shoes. The upper shoe 12 has the recesses 12a, 12b formed on a surface opposed to the lower shoe 13, and the lower shoe 13 has protrusions 13a, 13b formed on a surface opposed to the upper shoe 12 at locations corresponding to the recesses formed at the upper shoe in a manner of fitting into the recesses, respectively. Thus the upper shoe 12 and the lower shoe 13 are fitted to each other via the rubber layer 14 to form a plurality of fitting portions A, B. Further either the upper shoe 12 or the lower shoe 13 has a fragile thin portion 20 formed on the peripheral portion thereof which sustains damage when an external force is applied to the elastic bearing body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elastic bearing for a structure suitable for supporting a bridge, a building, a machine, etc., and more particularly to an elastic bearing for a bridge.

  Up to now, by placing a rubber bearing between an upper structure such as a bridge and a lower structure such as a pier, the force acting from the upper structure is transmitted to the lower structure, and the load of the upper structure is loaded. Absorption of deflection and torsional deformation is performed. This rubber bearing is composed of an upper collar fixed to the upper structure, a lower collar fixed to the lower structure by anchor bolts, and a rubber layer disposed therebetween. A downward vertical load is supported by the rubber support.

  On the other hand, with respect to horizontal load and vertical upward movement, for example, by placing and fixing a side block (movement limiting device) on the side end of the rubber bearing body, the horizontal direction of the upper structure and the lower structure and Restricts upward movement in the vertical direction.

  However, when the vertical load is supported by the rubber support and the horizontal load is supported by the movement restriction device such as the side block, the entire device including the rubber support is increased in size and weight, and the construction is complicated. Thus, there is a problem that the cost increases. Moreover, when the whole apparatus becomes large, construction may not be possible if the under-girder space is narrow.

  Therefore, in Patent Document 1, the upper collar has a recess formed on the surface facing the lower collar, and the lower collar has the recess at a position corresponding to the recess of the upper collar on the surface facing the upper collar. And a rubber bearing body in which one fitting portion is formed by fitting the upper collar and the lower collar via a rubber layer. Thereby, in this rubber support body, a vertical load support portion is configured by the upper horizontal plane, the lower horizontal plane facing the horizontal plane, and the rubber layer disposed between these horizontal planes. The horizontal load support portion is constituted by the inner side surface of the concave portion in the fitting portion, the outer side surface of the convex portion facing the side surface, and the rubber layer disposed between the side surfaces. Not only the vertical load but also the horizontal load can be supported only by the support body.

  In the rubber bearing as described in Patent Document 1, a certain level of seismic force can be constrained by the internal uneven fitting portion. However, for example, when a strong earthquake force of level 2 or higher is generated, the internal uneven fitting It cannot be visually confirmed whether or not the joint portion has been destroyed. For this reason, if the internal concave / convex fitting part is broken and damaged and then used continuously, there is a possibility that problems such as inability to fully exert the load support function by the fitting part with respect to vertical load and horizontal load may occur. is there.

  Therefore, it is desirable to confirm the soundness of the rubber bearing after a strong seismic force is generated. However, since the concave portion and the convex portion are provided inside the support body, it is difficult to check the soundness of the rubber support body.

JP 59-213808

  The subject of this invention is providing the elastic bearing body for structures which can confirm the soundness of a bearing body easily in the elastic bearing body which has a recessed part and a convex part inside.

The elastic bearing body for a structure of the present invention for solving the above problems has the following configuration.
(1) An upper frame that is fixed to the upper structure, a lower frame that is fixed to the lower structure, and an elastic layer that is disposed between the upper frame and the upper frame. A concave portion and / or a convex portion are formed on the surface to be fitted, and the lower frame is fitted to these at a surface facing the upper frame and at a position corresponding to the concave portion and / or the convex portion of the upper frame. An elastic support for a structure in which a convex portion and / or a concave portion are formed, and the upper frame and the lower frame are fitted via the elastic layer, and a plurality of fitting portions are formed. An elastic bearing body for a structure, wherein a fragile portion that is damaged when the elastic bearing body receives an external force is provided on an outer peripheral portion of the frame or the lower frame.
(2) The elastic bearing body for a structure according to (1), wherein the fragile portion is configured to be damaged by an earthquake force of level 2 or higher or an external force equivalent to this level.
(3) The support body according to (1) or (2), wherein the fragile portion is a thin portion provided on the outer peripheral portion.
(4) The support body according to (1), wherein the fragile portion is a groove or a slit provided in the outer peripheral portion.
(5) An upper frame fixed to the upper structure, a lower frame fixed to the lower structure, and an elastic layer disposed between the upper frame and the upper frame. A concave portion and / or a convex portion are formed on the surface to be fitted, and the lower frame is fitted to these at a surface facing the upper frame and at a position corresponding to the concave portion and / or the convex portion of the upper frame. An elastic support for a structure in which a convex portion and / or a concave portion are formed, and the upper frame and the lower frame are fitted via the elastic layer, and a plurality of fitting portions are formed. At least the outer peripheral portion of the frame or the lower frame is composed of two or more divided pieces and is fastened by a fastening member.
(6) The fastening member or the fastening portion of the split piece fastened by the fastening member is configured to be damaged by an earthquake force of level 2 or higher or an external force equivalent to this level. Elastic support for structures.
(7) The elastic support for a structure according to (5) or (6), wherein the fastening member fastens adjacent divided pieces to form at least the outer peripheral portion of the upper frame or the lower frame. .
(8) The fastening member fastens the two or more divided pieces to the main body of the upper frame or the lower frame to form an upper frame or a lower frame having the outer peripheral part (5) or (6) The elastic bearing body for structures as described in 1.

  According to the above (1), since the weak part is provided in the outer peripheral part of the upper frame or the lower frame, the soundness of the support body can be easily confirmed by checking the damage (for example, strain) of the weak part. Can be confirmed.

  According to the above (5), since at least the outer peripheral part of the upper frame or the lower frame is composed of two or more divided pieces, and these divided pieces are fastened by the fastening member, the fastening member or the fastening member By confirming the damage (for example, distortion) of the fastening portion of the split piece fastened at the step, the soundness of the support body can be easily confirmed.

(First embodiment)
Hereinafter, a rubber bearing body for a bridge according to an embodiment of the present invention will be described in detail with reference to the drawings. Fig.1 (a) is sectional drawing which shows the rubber bearing body 11 concerning 1st embodiment, FIG.1 (b) is the bottom view (upper frame) which shows the upper collar 12 (upper frame) of the rubber bearing body 11 ( FIG. 1C is a plan view showing the lower collar 13 (lower frame) of the rubber bearing body 11.

  As shown in FIG. 1 (a), the rubber support 11 includes an upper rod 12 fixed to an upper structure 101 such as a bridge via a sole plate 103, and a lower structure 102 such as a bridge pier via a base plate 104. And a rubber layer 14 disposed between them. The upper structure 101 and the upper collar 12 are fixed by a girder set bolt 105 that penetrates the sole plate 103. In addition, the lower structure 102 and the lower rod 13 are fixed by anchor bolts 106 that penetrate the base plate 104.

  As shown in FIGS. 1B and 1C, the lower collar 13 has a substantially cylindrical first convex portion 13a on the surface facing the upper collar 12, and a distance from the first convex portion 13a. And the substantially cylindrical 2nd convex part 13b surrounding the 1st convex part 13a is formed. On the other hand, the upper flange 12 has a first concave portion 12a and a first concave portion 12a which are fitted to these at positions corresponding to the first convex portion 13a and the second convex portion 13b, on the surface facing the lower rod 13. Two recesses 12b are formed. Then, the upper hook 12 and the lower hook 13 are fitted through the rubber layer 14 to form two fitting portions A and B as shown in FIG.

  The horizontal load support portion H is formed by the inner side surfaces of the concave portions 12a and 12b in the fitting portions A and B, the outer side surfaces of the convex portions 13a and 13b facing the side surfaces, and the rubber layer 14 disposed between the side surfaces. Is configured. Further, a vertical load support portion V is configured by the horizontal surface 12c of the upper rod 12, the horizontal surface 13c of the lower rod 13 facing the horizontal surface 12c, and the rubber layer 14 disposed between the horizontal surfaces 12c and 13c. Further, the horizontal surface (bottom surface of the concave portion) 12d of the concave portion 12a, the horizontal surface (end surface of the convex portion) 13d of the convex portion 13a facing the horizontal surface 12d, and the rubber layer 14 disposed between the horizontal surfaces 12d and 13d A load supporting portion V is configured, and is disposed between the horizontal surfaces 12e and 13e, and the horizontal surface 12e of the concave portion 12b (the bottom surface of the concave portion), the horizontal surface 13e of the convex portion 13b facing the horizontal surface 12e (the end surface of the convex portion). The rubber layer 14 forms a vertical load support portion V.

  And as shown to Fig.1 (a), it is preferable that the horizontal load support part H and the vertical load support part V are filled with the rubber layer 14 densely. Here, “the rubber layer 14 is densely filled” means that the rubber layer 14, the inner surfaces of the recesses 12 a and 12 b, the outer surfaces of the projections 13 a and 13 b, and the horizontal surfaces 12 c, 13 c, 12 d, 13 d, and 12 e , 13e are in close contact with each other substantially without any gap. Thereby, the horizontal load support part H and the vertical load support part V are formed alternately and continuously. Since the rubber layer 14 is in a sealed state in this way, the movement of the rubber layer 14 of the horizontal load support portion H is restricted by the rubber layer 14 of the vertical load support portion V adjacent to the rubber layer 14, and the vertical load The movement of the rubber layer 14 of the support portion V is restricted by the rubber layer 14 of the horizontal load support portion H adjacent to the rubber layer 14. That is, the movement of the rubber layer 14 of the horizontal load support portion H and the rubber layer 14 of the vertical load support portion V are regulated.

  The rubber layer 14 is bonded to the inner surfaces of the recesses 12a and 12b, the outer surfaces of the projections 13a and 13b, and the horizontal surfaces 12c, 13c, 12d, 13d, 12e, and 13e. The rubber layer 14 is blended with a rubber component as a main component such as a vulcanizing agent, a vulcanization accelerator, a vulcanization acceleration aid, an anti-aging agent, a reinforcing agent, a retarder, a plasticizer, and a colorant as required. It is a combination of agents. In particular, the thickness of the rubber layer 14 is about 5 to 50 mm, preferably about 10 to 30 mm.

  As the rubber component, for example, a diene rubber can be used. Examples of the diene rubber include natural rubber and synthetic rubber such as chloroprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butadiene rubber, isoprene rubber, butyl rubber, and halogenated butyl rubber. Examples of the vulcanizing agent include sulfur, organic peroxide, zinc white, and magnesia. Examples of the vulcanization acceleration aid include zinc white and stearic acid. Examples of the antioxidant include amine compounds such as phenyl-α-naphthylamine, N, N′-diphenyl-p-phenylenediamine, and N-phenyl-N′-isopropyl-p-phenylenediamine; 2,6-di- and phenolic compounds such as t-butyl-p-cresol and 4,4′-butylidenebis (3-methyl-6-t-butylphenol). Examples of the plasticizer include petroleum process oil, tar, pitch, natural fats and oils, animal and vegetable fats and oils, and synthetic plasticizers. Examples of the reinforcing agent include carbon black, silica, and white carbon.

  As the upper collar 12 and the lower collar 13, for example, a metal plate such as a steel plate, ceramics, a hard plastic plate, or the like can be used. The thickness t2 of the upper collar 12 should be about 10 to 150 mm, preferably about 20 to 100 mm, and the thickness t4 of the lower collar 13 should be about 10 to 150 mm, preferably about 20 to 100 mm. Good. The depth t3 of the recesses 12a and 12b is about 5 to 100 mm, preferably about 20 to 50 mm, and the height t5 of the projections 13a and 13b is about 5 to 100 mm, preferably 20 to 50 mm. It should be a degree.

  The upper iron 12 and the lower iron 13 can be produced by forming a concave portion and / or a convex portion in a material such as a steel plate using a known means such as cutting. Moreover, as another method of forming a convex part, the method of joining separately the material used as a convex part to materials, such as a steel plate, using means, such as welding, for example.

  A thin portion 20 (fragile portion) is formed on the outer peripheral portion of the upper collar 12. That is, the thin portion 20 is a portion having the smallest thickness between the outer surface of the second recess 12b and the outer peripheral surface of the upper collar 12 in the outer peripheral portion of the upper collar 12, as shown in FIG. Thus, four places are formed in the outer periphery of the upper collar 12. The thickness t1 of the thin portion 20 is a thickness that is damaged by, for example, an earthquake force of level 2 or higher or an external force equivalent to this level. Specifically, since the thickness t1 of the thin portion 20 varies depending on the material of the upper collar 12 to be used, the thickness t1 may be appropriately determined in consideration of the durability of the target rubber bearing body. In addition, damage means what can be easily confirmed visually, such as distortion, such as a swelling, a bending, a twist, and also a defect | deletion and a chip.

  The rubber support 11 as described above is, for example, a rubber composition in which an upper rod 12 and a lower rod 13 are arranged at predetermined intervals in a mold, and various compounding agents are blended with the rubber component in the mold. Can be manufactured by injecting by injection or the like and integrally vulcanizing and bonding simultaneously with vulcanization molding.

  As another method for producing the rubber support 11, a rubber composition in which various compounding agents are blended with a rubber component is molded by extrusion or the like to prepare a rubber layer having a predetermined thickness in advance, and then the rubber layer And a method of laminating the upper collar 12 and the lower collar 13 and bonding them with an adhesive or the like. Examples of the adhesive include thermoplastic adhesives such as vinyl acetate, acrylic, ethylene copolymer, dope cement, monomer cement, polyamide, polyester, polyurethane; chloroprene rubber, nitrile rubber, recycled rubber, styrene Examples thereof include rubber adhesives such as butadiene rubber (SBR) and natural rubber.

  As described above, in the rubber bearing body according to this embodiment, the thin wall portion 20 is formed on the outer peripheral portion of the upper collar 12, and the thin wall portion 20 is a fragile portion. Depending on whether the thin-walled portion 20 is damaged, the soundness of the concave and convex fitting portions A and B inside can be known. Therefore, it is possible to guarantee the product whether or not the rubber bearing body has sufficient performance for subsequent use.

  In this embodiment, since the outer periphery of the upper collar 12 constitutes the outer periphery of the rubber bearing body, the thin wall portion 20 is formed on the outer periphery of the upper collar 12, but the outer periphery of the lower collar 13 is the rubber. When the outer periphery of the support body is configured, a thin portion is formed on the outer periphery of the lower collar 13.

(Second embodiment)
Next, a rubber bearing body for a bridge according to a second embodiment of the present invention will be described with reference to FIG. 2A is a cross-sectional view showing the rubber bearing body 11 according to the second embodiment, and FIG. 2B is a bottom view showing the upper collar 12 (upper frame) of the rubber bearing body 11. It is a figure (figure seen from the surface side facing the lower eyelid 13). In addition, the same code | symbol is attached | subjected to the same structural member as 1st embodiment, and description is abbreviate | omitted.

  In the rubber support 11 according to this embodiment, a groove 26 is formed on the outer peripheral surface of the upper collar 12 in place of the thin portion 20 in the first embodiment. That is, as shown in FIG. 2 (a), the groove 26 is formed at the site where the second recess 12b is formed, whereby a thin wall is formed between the bottom of the groove 26 and the outer surface of the second recess 12b. By forming the portion, the same operational effects as the thin portion 20 in the first embodiment can be obtained.

  The grooves 26 are respectively formed on the four sides of the outer peripheral surface of the upper collar 12. The length of the groove 26 is not particularly limited. For example, the length of the groove 26 is easily damaged by an earthquake force of level 2 or higher or an external force equivalent to this level. Specifically, the length of the groove 26 is about 100% to the total length of each side. The length may be 50%. If necessary, the groove 26 may be formed over the entire circumference of the upper collar 12. Further, the width t12 and the depth t13 of the groove 26 are not particularly limited, and may be any width and depth that are easily damaged by an earthquake force of level 2 or higher or an external force equivalent to this level.

  Further, since the outer peripheral portion of the upper collar 12 constitutes the outer peripheral portion of the rubber bearing body, the groove 26 or the slit is formed in the outer circumferential portion of the upper collar 12, but the outer peripheral portion of the lower collar 13 is the outer periphery of the rubber bearing body. In the case of constituting the part, a groove 26 or a slit is formed in the outer peripheral part of the lower collar 13. Others are the same as in the first embodiment.

(Third embodiment)
A rubber support for a bridge according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3A is a sectional view showing the rubber bearing body 11 according to the third embodiment, and FIG. 3B is a bottom view showing the upper collar 30 of the rubber bearing body 11 (with the lower collar 13 and the lower collar 13). It is the figure seen from the opposite surface side). In FIG. 3, the same components as those of the rubber support 11 shown in FIG. 1 are denoted by the same reference numerals as those in FIG.

  In the rubber bearing body 11 according to this embodiment, the upper collar 30 is composed of divided pieces 31, 32, 33, 34 and an upper collar body 35 that constitute the outer circumference of the upper collar. The divided pieces 31, 32, 33 and 34 are disposed on the outer periphery of the upper rod main body 35, and are fastened and fixed to the outer periphery of the upper rod main body 35 by bolts 39 (fastening members). That is, the bolt 39 is screwed into a screw hole provided in the upper collar body 35.

  In this way, the upper collar 30 is obtained by fastening and fixing the outer peripheral divided pieces 31, 32, 33, 34 and the upper collar body 35 with the bolts 39, and thus is relatively vulnerable to external force, for example, level The bolt 39 or the fastening portion of the divided pieces 31, 32, 33, 34 fastened by the bolt 39 with two or more seismic forces or an external force equivalent to this is easily damaged. For example, the bolt 39 is broken or deformed, Damages such as gaps and shifts between the split pieces are likely to occur. As a result, the soundness of the rubber bearing body can be easily confirmed. The bolt 39 to be used is preferably of a thickness that is easily damaged by an earthquake force of level 2 or higher or an external force equivalent to this level.

  Also in this embodiment, when the outer peripheral portion of the lower collar 13 constitutes the outer peripheral portion of the rubber bearing body, the lower collar 13 is constituted by a divided piece of the outer peripheral portion and the main body instead of the upper collar 30. You can fix it with bolts. Others are the same as in the first embodiment.

(Fourth embodiment)
A rubber support for a bridge according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4A is a sectional view showing the rubber bearing body 11 according to the fourth embodiment, and FIG. 4B is a bottom view showing the upper collar 40 of the rubber bearing body 11 (with the lower collar 13 and It is the figure seen from the opposite surface side). In addition, the same code | symbol is attached | subjected to the same structural member as 1st embodiment, and description is abbreviate | omitted.

  In the rubber bearing body 11 of this embodiment, the upper rod 40 is composed of divided pieces 41, 42, 43, 44 and an upper rod main body 45 constituting the outer periphery of the upper rod, as in the third embodiment described above. Is done. Each divided piece 41, 42, 43, 44 is provided with mounting portions 47, 47 having bolt insertion holes 46 at both ends on the outer peripheral side.

  The split pieces 31, 32, 33, and 34 are disposed on the outer periphery of the upper collar body 35, the attaching portions 47 and 47 of adjacent split pieces are overlapped, and a bolt 49 (fastening member) is inserted into the bolt insertion hole 46. Then, the split pieces 41, 42, 43, 44 are fastened and fixed to the outer periphery of the upper collar body 35 by screwing with the nut 50.

  Thus, since the upper collar 40 is obtained by fastening and fixing the divided pieces 41, 42, 43, 44 on the outer peripheral portion and the upper collar body 45 with the bolts 49, it is relatively vulnerable to external force, for example, level The bolt 49 or the mounting portion 47 fastened with the bolt 49 or the divided pieces 31, 32, 33, 34 are easily damaged by two or more seismic forces or an external force equivalent to this, for example, the bolt 49 is broken or deformed. In addition, damage such as a gap or displacement between the mounting portions 47 and 47 is likely to occur. As a result, the soundness of the rubber bearing body can be easily confirmed. Note that the bolt 49 to be used is preferably of a thickness that is easily damaged by an earthquake force of level 2 or higher or an external force equivalent to this level.

  The same effect can be obtained by dividing the upper collar 40 into four parts and fixing them together with the bolts 49 and the nuts 50 with the mounting portion 47 without using the upper collar body 45.

  Also in this embodiment, when the outer peripheral portion of the lower rod 13 constitutes the outer peripheral portion of the rubber bearing body, the lower rod 13 is constituted by a divided piece of the outer peripheral portion and the main body instead of the upper rod 40. What is necessary is just to fix with a volt | bolt in the attaching part of a split piece. Others are the same as in the first embodiment.

  It should be noted that the present invention can be improved and changed in various ways within the scope of the claims. For example, instead of the rubber layer 14, other elastic materials such as a thermoplastic resin and a thermoplastic elastomer may be used. Examples of the thermoplastic resin include polyethylene, polypropylene, polyvinyl chloride, ABS resin, acrylic resin, polystyrene, polycarbonate, nylon, polyacetal, polyethylene terephthalate, polyvinylidene chloride, fluororesin, and polybutadiene. Examples of the thermoplastic elastomer (TPE) include polystyrene-based TPE, poroolefin-based TPE, polyvinyl chloride-based TPE, polyurethane-based TPE (TPU), polyester-based TPE, and polyamide-based TPE.

  Moreover, the elastic support body of this invention is applicable also to various structures, such as a building and machinery other than for bridge | bridging. For example, a building elastic support body includes an upper frame fixed to a building that is an upper structure, a lower frame fixed to a foundation that is a lower structure, and an elastic layer disposed therebetween. . The elastic support body for machines includes an upper frame fixed to a machine that is an upper structure, a lower frame fixed to a foundation that is a lower structure, and an elastic layer disposed therebetween.

(A) is sectional drawing which shows the support body concerning 1st embodiment of this invention, (b) is a bottom view which shows the upper collar of the support body, (c) is the lower collar of the support body FIG. (A) is sectional drawing which shows the support body concerning 2nd embodiment of this invention, (b) is a bottom view which shows the upper collar of the support body. (A) is sectional drawing which shows the support body concerning 3rd embodiment of this invention, (b) is a bottom view which shows the upper collar of the support body. (A) is sectional drawing which shows the support body concerning 4th embodiment of this invention, (b) is a bottom view which shows the upper collar of the support body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Base 12 ... Upper collar 13 ... Lower collar 14 ... Rubber layer 20 ... Thin part (fragile part)
25 ... Fragile part 26 ... Groove 30 ... Upper collar 31, 32, 33, 34, 35 ... Split piece 39 ... Bolt (fastening member)
40 ... upper rod 41, 42, 43, 44 ... split piece 49 ... bolt (fastening member)

Claims (8)

An upper frame fixed to the upper structure, a lower frame fixed to the lower structure, and an elastic layer disposed between the upper frame and the upper frame are provided on a surface facing the lower frame. Concave portions and / or convex portions are formed, and the lower frame has a convex portion that fits into the lower frame on a surface facing the upper frame and at a position corresponding to the concave and / or convex portions of the upper frame, and / Or a concave portion is formed, the upper frame and the lower frame are fitted through the elastic layer, and is a structural elastic support body in which a plurality of fitting portions are formed,
An elastic bearing body for a structure, wherein a fragile portion that is damaged when the elastic bearing body receives an external force is provided on an outer peripheral portion of the upper frame or the lower frame.   The elastic support for a structure according to claim 1, wherein the fragile portion is configured to be damaged by an earthquake force of level 2 or more or an external force equivalent to the earthquake force.   The elastic support for a structure according to claim 1 or 2, wherein the fragile portion is a thin wall portion provided on the outer peripheral portion.   The elastic support for a structure according to claim 1 or 2, wherein the fragile portion is formed by a groove provided in the outer peripheral portion. An upper frame fixed to the upper structure, a lower frame fixed to the lower structure, and an elastic layer disposed between the upper frame and the upper frame are provided on a surface facing the lower frame. Concave portions and / or convex portions are formed, and the lower frame has a convex portion that fits into the lower frame on a surface facing the upper frame and at a position corresponding to the concave and / or convex portions of the upper frame, and / Or a concave portion is formed, the upper frame and the lower frame are fitted through the elastic layer, and is a structural elastic support body in which a plurality of fitting portions are formed,
At least an outer peripheral portion of the upper frame or the lower frame is composed of two or more divided pieces and fastened by a fastening member.   The structure according to claim 5, wherein the fastening member or the fastening portion of the split piece fastened by the fastening member is configured to be damaged by an earthquake force of level 2 or higher or an external force equivalent to this level. Elastic bearing body.   The elastic support for a structure according to claim 5 or 6, wherein the fastening member fastens adjacent divided pieces to form at least the outer peripheral portion of the upper frame or the lower frame. The structure according to claim 5 or 6, wherein the fastening member fastens the two or more divided pieces to a main body of the upper frame or the lower frame to form an upper frame or a lower frame having the outer peripheral portion. Elastic bearing body.

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