JP2009024863A - Waterproof cover for base-isolation laminate rubber and base-isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof cover for base-isolation laminate rubber and a base-isolation device, capable of preventing the water from intruding into a lamination part. <P>SOLUTION: The waterproof cover 5 for base-isolation laminate rubber is attached to the base-isolation laminate rubber 1 of such a structure that the lamination part 4 consisting of a plurality of rubber layers 10 and hard plates 11 laminated one over another alternately is interposed between the upper 2 and the lower supporting plate 3, and covers at least the lamination part 4, wherein the arrangement includes a hard part 20 assuming a cylindrical shape stretching along the axis O of the lamination part 4 and accommodating at least the part 4 in the inside and having stiffness extending circumferentially along the cover and a soft part 21 having flexibility extending circumferentially along the cover, and the two ends are attached removably to the supporting plates 2 and 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a waterproof cover for seismic isolation laminated rubber that is mounted on a seismic isolation laminated rubber, and a seismic isolation device including the same.

2. Description of the Related Art Conventionally, some seismic isolation devices installed in structures such as buildings and bridges include a seismic isolation laminated rubber having a configuration in which a laminated portion is interposed between upper and lower flanges. The laminated portion has a configuration in which a plurality of rubber layers and internal steel plates are alternately laminated. In recent years, seismic isolation laminated rubber having a configuration in which the outer peripheral surface of the laminated part is covered with a covering rubber has been provided. The covering rubber is formed integrally with the rubber layer of the laminated portion, or is firmly bonded to the outer peripheral surface of the laminated portion by vulcanization adhesion or the like. The seismic isolation laminated rubber having the above-described configuration is disposed between the lower structure and the upper structure, and the lower flange is attached to the upper surface of the lower structure and the upper flange is attached to the lower surface of the upper structure. According to this seismic isolation laminated rubber, when the earthquake or the like occurs, the laminated portion is deformed in the horizontal direction, so that vibration transmitted from the lower structure to the upper structure is reduced, and shaking of the upper structure can be suppressed. . Moreover, long-term deterioration of a laminated part can be suppressed because the outer peripheral surface of a laminated part is coat | covered with the covering rubber (for example, refer patent document 1).
JP-A 64-29538

  Generally, the seismic isolation pit where the seismic isolation laminated rubber is installed is equipped with drainage facilities, etc., and basically has a structure that does not allow water to enter or store water, so that the seismic isolation laminated rubber is exposed to water for a long time. It is not envisaged. However, during the construction, the above-described drainage facilities and the like are incomplete, and the seismic isolation laminated rubber may be exposed to water. In addition, even after the completion of the construction, if there is more water than expected due to a typhoon or flood, the seismic isolation laminated rubber may be exposed to water.

  Moreover, a crack may generate | occur | produce in covering rubber | gum by the deformation | transformation of the laminated part by the long-term load to the laminated part after completion, an earthquake, etc. As described above, the covering rubber is molded integrally with the rubber layer of the laminated portion, or is firmly bonded to the outer peripheral surface of the laminated portion, and it is difficult to remove the covering rubber from the laminated portion. It is difficult to replace the coated rubber with a new one when a crack occurs.

  Therefore, in the conventional technology, when the seismic isolation laminated rubber is exposed to water for a long period of time as described above, water may infiltrate into the laminated portion from cracks generated in the coated rubber, and thereby the inner steel plate may rust. There is.

  The present invention has been made in consideration of the above-described conventional problems, and an object of the present invention is to provide a waterproof cover for a seismic isolation laminated rubber and a seismic isolation device that can prevent water from entering the laminated portion.

  The waterproof cover for a seismic isolation laminated rubber according to the present invention is attached to a seismic isolation laminated rubber having a configuration in which a laminated portion formed by alternately laminating a plurality of rubber layers and hard plates is interposed between a pair of upper and lower support plates, A waterproof cover for a seismic isolation laminated rubber covering at least the laminated part, which has a cylindrical shape extending along the axial direction of the laminated part and accommodating at least the laminated part inside, and in the cover circumferential direction A hard portion having extended rigidity and a soft portion having flexibility extending in the circumferential direction of the cover are provided, and both ends are detachably attached to the support plate, respectively.

With such a feature, since the laminated portion of the seismic isolation laminated rubber is accommodated in the waterproof cover, water from the outside is blocked by the waterproof cover and the laminated portion is prevented from being exposed to water (waterproof property). ).
Further, when a displacement occurs in the horizontal direction due to an earthquake or the like, the soft cover of the waterproof cover is deformed, so that the waterproof cover is deformed following the deformation of the seismic isolation laminated rubber in the horizontal direction ( Followability).
Further, since the waterproof cover is detachably attached, the waterproof cover is removed when the periodic inspection of the seismic isolation laminated rubber is performed after completion. When the waterproof cover is damaged or deteriorated, the waterproof cover is removed and replaced with a new waterproof cover (easy to attach / detach).

In the waterproof cover for seismic isolation laminated rubber according to the present invention, it is preferable that a plurality of the hard portions and a plurality of the soft portions are alternately connected in the axial direction.
Accordingly, the waterproof cover has a configuration in which a plurality of deformable portions (soft portions) are formed, and the waterproof performance of the waterproof cover in the horizontal direction is improved. Thereby, the followability of the waterproof cover with respect to the horizontal deformation of the seismic isolation laminated rubber is improved.

Moreover, it is preferable that the waterproof cover for seismic isolation laminated rubber according to the present invention is formed in a cylindrical shape by combining a plurality of divided bodies divided in a vertically split shape.
This makes it easier to attach and detach the waterproof cover. That is, when attaching the waterproof cover, it is only necessary to assemble a plurality of divided bodies into a cylindrical shape so as to sandwich the laminated portion, and the attachment is easy. On the other hand, when removing the waterproof cover, it is only necessary to disassemble the plurality of divided bodies assembled in a cylindrical shape, which is easy to remove.

Moreover, it is preferable that the both ends of the waterproof cover for seismic isolation laminated rubber according to the present invention are attached to the support plate via magnets.
Thereby, both ends of the waterproof cover are respectively bonded to the support plate by the magnetic force of the magnet, so that the waterproof cover can be further easily attached and detached. Moreover, since the both ends of a waterproof cover are reliably adhere | attached by the magnetic force of a magnet, the edge part of a waterproof cover is stopped reliably and the waterproofness by a waterproof cover improves.

In the waterproof cover for a seismic isolation laminated rubber according to the present invention, it is preferable that the soft portion is curved in a longitudinal sectional view along the axial direction.
Thereby, the tensile stress and compressive stress which act on the said soft part at the time of a deformation | transformation of a soft part are reduced, and a soft part is deform | transformed easily.

  Further, the seismic isolation device according to the present invention is a seismic isolation device comprising a seismic isolation laminated rubber having a configuration in which a plurality of laminated portions in which rubber layers and hard plates are alternately laminated are interposed between a pair of upper and lower support plates. The above-described seismic isolation laminated rubber waterproof cover is provided.

According to the waterproof cover for a seismic isolation laminated rubber and the seismic isolation device according to the present invention, the entry of water from the outside into the waterproof cover is blocked, so that the entry of water into the laminated portion can be prevented. Therefore, even if water accumulates around the seismic isolation rubber during construction or after completion, the laminated part is not exposed to water, and deterioration of the laminated part such as rusting of the hard plate of the laminated part is prevented. Can do.
In addition, since the waterproof cover exhibits followability to the deformation of the seismic isolation laminated rubber, the waterproof cover will not be damaged even if a horizontal displacement due to an earthquake or the like occurs. Therefore, waterproofness can be ensured even after an earthquake or the like occurs. Moreover, the seismic isolation effect of the seismic isolation laminated rubber is not reduced by the waterproof cover due to the followability of the waterproof cover described above, so that the seismic isolation effect can be sufficiently exhibited.
Furthermore, since the waterproof cover can be easily attached and detached, periodic inspection of the laminated portion after completion and replacement of the waterproof cover are easy, and maintenance of the seismic isolation laminated rubber can be easily performed. Further, since the waterproof cover can be easily replaced, when the prevention cover is deteriorated or damaged, it can be easily replaced with a new waterproof cover, and the waterproof property can be maintained.

  Hereinafter, embodiments of a waterproof cover for a seismic isolation laminated rubber and a seismic isolation device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a seismic isolation device 30 as an example of the present invention, FIG. 2 is a side view of the seismic isolation device 30, and FIG. 3 is a plan sectional view between A and A shown in FIG. .

As shown in FIGS. 1 to 3, the seismic isolation device 30 has a configuration including a seismic isolation laminated rubber 1 and a waterproof cover 5.
The seismic isolation laminated rubber 1 is a device for reducing vibration transmitted from the lower structure 8 to the upper structure 9, and is interposed between the lower structure 8 and the upper structure 9. The seismic isolation laminated rubber 1 includes a lower flange 2 (support plate) attached to the lower structure 8, an upper flange 3 (support plate) attached to the upper structure 9, and between the lower flange 2 and the upper flange 3. And an intervening laminated portion 4.

  The lower flange 2 and the upper flange 3 are each made of a circular steel plate, and are provided at positions facing each other with a predetermined interval in the vertical direction. A plurality of bolt holes 2a and 3a are formed at predetermined intervals in each outer peripheral portion of the lower flange 2 and the upper flange 3, and via the anchor bolts 7 inserted into these bolt holes 2a and 3a. The lower flange 2 is fixed to the lower structure 8, and the upper flange 3 is fixed to the upper structure 9.

  The laminated portion 4 has a configuration in which a plurality of circular rubber layers 10 and circular internal steel plates 11 (hard plates) are alternately stacked to form a substantially cylindrical shape as a whole, and the outer peripheral surface thereof is covered with a covering rubber 12. Consists of. The rubber layer 10 and the covering rubber 12 are integrally molded and are made of natural rubber, high damping rubber or the like. Rubber layers 10 are formed on both ends (upper and lower ends) of the laminated portion 4 in the axis O direction, and both ends (upper and lower rubber layers 10) of the laminated portion 4 are vulcanized to the lower flange 2 and the upper flange 3. Glued and fixed.

A waterproof cover 5 that covers the laminated portion 4 is attached to the seismic isolation laminated rubber 1 having the above-described configuration.
The waterproof cover 5 is a cylindrical member that extends along the direction of the axis O, and is disposed substantially coaxially with the stacked portion 4. The inner diameter of the waterproof cover 5 is larger than the outer diameter of each of the laminated portion 4, the lower flange 2 and the upper flange 3, and the laminated portion 4, the lower flange 2 and the upper flange 3 are accommodated inside the waterproof cover 5, respectively. Has been.

  The waterproof cover 5 described above is composed of a pair of divided bodies 5A and 5B divided in a vertically split shape. That is, each of the pair of divided bodies 5A and 5B is a member having a semicircular arc shape in a cross-sectional view (a cross-sectional view along the vertical plane of the axis O) as shown in FIG. It is formed in a cylindrical shape by combining 5B. Further, the pair of divided bodies 5 </ b> A and 5 </ b> B are joined via a joining member 6. The joining member 6 is extended along the joining part of a pair of division body 5A, 5B, and is joined to each side edge part of a pair of division body 5A, 5B, respectively. The joining member 6 is a member that can be freely deformed according to the deformation of the waterproof cover 5, and is made of, for example, a rectangular rubber plate.

  The pair of divided bodies 5A and 5B (waterproof cover 5) includes a plurality (six) hard portions 20 extending in the cover circumferential direction and a plurality (five) soft portions extending in the cover circumferential direction. 21 are provided. The hard portion 20 has a semi-ring shape, and is made of a material having rigidity such as metal or resin. As shown in FIG. 3, the end surfaces of the hard portions 20 and 20 of the pair of divided bodies 5A and 5B are in contact with each other, and the two hard portions 20 and 20 are formed in a ring shape. On the other hand, the soft portion 21 has a semi-ring shape and is made of a flexible material such as rubber or fluororesin. The end surfaces of the soft portions 21 and 21 of the pair of divided bodies 5A and 5B are spaced from each other, and the above-described joining member 6 is disposed between these end surfaces. Further, as shown in FIG. 1, the soft portion 21 is curved in a substantially U shape that protrudes outward in the radial direction of the cover in a longitudinal sectional view along the axis O direction, and covers from the outer peripheral surface of the hard portion 20. It protrudes outward in the radial direction.

  The plurality of hard portions 20 and the plurality of soft portions 21 described above are alternately connected in the axis O direction. That is, the soft part 21 is disposed between the upper and lower hard parts 20, and the upper and lower ends thereof are respectively joined to the hard part 20. In addition, the hard part 20 (end part hard part 20A) is each arrange | positioned at the both ends (upper and lower ends) part of the waterproof cover 5, These end part hard parts 20A are arrange | positioned in the intermediate part of the waterproof cover 5. The dimension in the direction of the axis O is longer than the hard part 20 (intermediate hard part 20B).

  The waterproof cover 5 having the above-described configuration is detachably attached to both the lower flange 2 and the upper flange 3 made of a steel plate (magnetic material) via magnets 22 at both ends in the axis O direction. More specifically, a magnet 22 made of, for example, a rubber magnet is bonded to the lower end inner peripheral surface of the lower end hard portion 20A and the upper end inner peripheral surface of the upper end hard portion 20A. As shown in FIG. 3, the magnet 22 has a half-ring shape in cross-sectional view extending in the cover circumferential direction. The inner peripheral surface of the magnet 22 is magnetically attached to the outer peripheral surface (side end surface) of the lower flange 2 or the upper flange 3. As shown in FIG. 3, the magnet 22 provided on one divided body 5 </ b> A and the magnet 22 provided on the other divided body 5 </ b> B are in contact with each other as shown in FIG. It is formed into a shape.

  Next, the operation of the waterproof cover 5 having the above-described configuration will be described.

  When the waterproof cover 5 having the above-described configuration is attached to the seismic isolation laminated rubber 1, the laminated portion 4 and the upper and lower flanges 2 and 3 are accommodated inside the waterproof cover 5. At this time, when water accumulates in the seismic isolation pit where the seismic isolation laminated rubber 1 is installed, water from the outside is blocked by the waterproof cover 5, and water intrusion into the waterproof cover 5 is prevented. In particular, in the waterproof cover 5 having the above-described configuration, both ends of the waterproof cover 5 are attached to the lower flange 2 and the upper flange 3 via the magnets 22, so that both ends of the waterproof cover 5 are securely bonded by the magnetic force of the magnets 22. Thus, the ingress of water from the upper and lower ends of the waterproof cover 5 is prevented. Moreover, since the joining part of a pair of division body 5A, 5B is stopped by the joining member 6, the permeation of the water from the boundary of a pair of division body 5A, 5B is prevented.

  When attaching the waterproof cover 5 to the seismic isolation laminated rubber 1, first, the pair of divided bodies 5A and 5B are combined so that the seismic isolation laminated rubber 1 is sandwiched from both sides. At this time, the magnets 22 provided on the inner peripheral surfaces of the upper and lower ends of the pair of divided bodies 5A and 5B are brought into contact with the outer peripheral surfaces of the upper and lower flanges 2 and 3, respectively. Thereby, the magnet 22 is magnetically attached to the outer peripheral surfaces of the flanges 2 and 3, and the upper and lower ends of the pair of divided bodies 5A and 5B are attached to the lower flange 2 and the upper flange 3, respectively. Next, the joining member 6 is arranged in a gap formed between the end surface of the soft part 21 of the one divided body 5A and the end surface of the soft part 21 of the other divided body 5B, and a pair is formed via the joining member 6. The side ends of the divided bodies 5A and 5B are joined together. Thus, the attachment of the waterproof cover 5 is completed.

  Moreover, when removing the waterproof cover 5 from the seismic isolation laminated rubber 1, the joining member 6 provided between a pair of division body 5A, 5B is removed first. Next, the combined pair of divided bodies 5A and 5B is disassembled. At this time, since the upper and lower ends of the pair of divided bodies 5A and 5B are only attached to the upper and lower flanges 2 and 3 by the magnetic force of the magnet 22, only the pair of divided bodies 5A and 5B are moved away from each other. Easily disassembled. Thus, the removal of the waterproof cover 5 is completed.

  As described above, since the waterproof cover 5 can be easily attached to and detached from the seismic isolation laminated rubber 1, when the periodic inspection of the seismic isolation laminated rubber 1 is performed after completion, the waterproof cover 5 is removed according to the above-described removal procedure. After that, the seismic isolation laminated rubber 1 is inspected. And after completion | finish of a test | inspection, the original waterproof cover 5 is attached according to the above-mentioned attachment procedure, and a test | inspection is completed. At this time, if a deterioration of the waterproof cover 5 is found, such as a crack in the soft part 21 of the waterproof cover 5, etc., the entire waterproof cover 5 or the deteriorated divided bodies 5A and 5B are replaced with new ones. Replace and install.

  When the seismic isolation laminated rubber 1 is mounted with the waterproof cover 5 and a horizontal displacement occurs due to an earthquake or the like, and the seismic isolation laminated rubber 1 is deformed in the horizontal direction, the waterproof cover 5 The rubber 1 deforms following the horizontal deformation of the rubber 1. That is, when the lower flange 2 and the upper flange 3 are relatively moved in the horizontal direction and the laminated portion 4 is deformed into an inclined shape, the soft portion 21 of the waterproof cover 5 is deformed and the waterproof cover 5 is inclined. Transformed into

  In particular, in the waterproof cover 5 described above, since the plurality of hard portions 20 and the plurality of soft portions 21 are alternately connected in the direction of the axis O, the waterproof cover 5 has a deformable portion (soft portion 21). ) Are formed in a plurality of layers (5 layers in this embodiment). Accordingly, the waterproof performance of the waterproof cover 5 in the horizontal direction is high, and the followability of the waterproof cover 5 to the horizontal deformation of the seismic isolation laminated rubber 1 is high.

  Further, in the waterproof cover 5 having the above-described configuration, since the soft portion 21 is curved in a longitudinal sectional view, the tensile stress and the compressive stress acting on the soft portion 21 when the soft portion 21 is deformed are kept low. Thus, the soft portion 21 can be easily deformed.

  According to the waterproof cover 5 and the seismic isolation device 30 having the above-described configuration, water can be prevented from entering the waterproof cover 5, so that high waterproofness can be realized, and the seismic isolation layer can be formed during or after construction. Even if water accumulates around the rubber 1, the laminated portion 4 and the upper and lower flanges 2 and 3 are not exposed to water. Thereby, the rusting of the internal steel plate 11 and the upper and lower flanges 2 and 3 in the laminated part 4 can be prevented.

In addition, since the waterproof cover 5 exhibits followability to the deformation of the seismic isolation laminated rubber 1, the waterproof cover 5 will not be damaged even if a horizontal displacement due to an earthquake or the like occurs. Therefore, waterproofness can be ensured even after an earthquake or the like occurs.
In particular, since the waterproof cover 5 described above has high followability to the horizontal deformation of the seismic isolation laminated rubber 1, it can cope with a large displacement.

  Moreover, since the waterproof cover 5 does not reduce the seismic isolation effect of the seismic isolation laminated rubber 1 by the followability of the waterproof cover 5, the seismic isolation effect can be sufficiently exhibited.

  Further, since the waterproof cover 5 can be easily attached to and detached from the seismic isolation laminated rubber 1, the periodic inspection of the laminated portion 4 after completion and the replacement of the waterproof cover 5 are easy, and the maintenance of the seismic isolation laminated rubber 1 is easily performed. be able to.

Further, since the waterproof cover 5 can be easily replaced, when the prevention cover 5 is deteriorated or damaged, it can be easily replaced with a new waterproof cover 5 and the waterproof property can be maintained.
In particular, in the waterproof cover 5, the soft portion 21 is curved, and the tensile stress and the compressive stress acting on the soft portion 21 when the soft portion 21 is deformed can be kept low. This makes it difficult to extend the life of the waterproof cover 5.

As mentioned above, although the embodiment of the waterproof cover for seismic isolation laminated rubber and the seismic isolation device 30 according to the present invention has been described, the present invention is not limited to the above-described embodiment, and does not depart from the spirit thereof. It can be changed as appropriate.
For example, in the above-described embodiment, the waterproof cover 5 has a cylindrical shape, but the present invention may be a rectangular tube-shaped waterproof cover.

  Further, in the above-described embodiment, the laminated portion 4 and the upper and lower flanges 2 and 3 are respectively arranged inside the waterproof cover 5 and the entire seismic isolation laminated rubber 1 is covered with the waterproof cover 5. The upper and lower flanges 2 and 3 may be disposed outside the waterproof cover, and only the laminated portion 4 of the seismic isolation laminated rubber 1 may be covered with the waterproof cover. For example, the inner diameter of the waterproof cover is larger than the outer diameter of the laminated portion 4 and smaller than the upper and lower flanges 2, 3, and the flanges projecting outward in the cover radial direction at the upper and lower ends of the waterproof cover These upper and lower flanges can be removably attached to the upper surface of the lower flange 2 and the lower surface of the upper flange 3.

  In the embodiment described above, the six hard portions 20 and the five soft portions 21 are alternately connected in the direction of the axis O, but in the present invention, the number of the hard portions 20 and the soft portions 21 is appropriately changed. Is possible. For example, it is possible to adopt a configuration in which one cylindrical soft portion is interposed between the end hard portions 20A at both ends.

  Further, in the above-described embodiment, the hard portions 20 (end portion hard portions 20A) are respectively disposed at both end portions of the waterproof cover 5, but in the present invention, soft portions are disposed at both end portions of the waterproof cover 5. It is also possible to have an installed configuration. For example, a rubber soft portion containing an iron component may be disposed at both ends of the waterproof cover 5 and the soft portions at both ends may be attached to the upper and lower flanges 2 and 3 via magnets 22. Or the structure which arrange | positions the soft part which consists of a rubber magnet in the both ends of the waterproof cover 5, and directly magnetizes the soft part of this both ends to the upper and lower flanges 2 and 3 may be sufficient.

  In the above-described embodiment, the pair of divided bodies 5A and 5B divided in a vertically divided manner are combined to form a cylinder, but the present invention combines three or more divided bodies. A waterproof cover formed in a cylindrical shape may be used. Furthermore, the present invention may be a waterproof cover that is not divided into a plurality of divided bodies. For example, it may be a waterproof cover formed in a cylindrical shape by winding a single plate-shaped member around the outer periphery of the seismic isolation laminated rubber 1.

  In the above-described embodiment, the magnet 22 is bonded to the inner peripheral surface of the end hard portion 20A and magnetized to the outer peripheral surface of the lower flange 2 or the upper flange 3. When the hard portion 20A (both ends of the waterproof cover) is a magnetic material such as iron, the magnet 22 is bonded along the outer peripheral surface of the flanges 2 and 3, and the outer peripheral surface of the magnet 22 is the inner peripheral surface of the end hard portion 20A. It is also possible to adopt a configuration in which the magnet 22 is magnetized on the outer peripheral surface of the flanges 2 and 3 and the inner peripheral surface of the end hard portion 20A. is there.

  In the embodiment described above, both ends of the waterproof cover 5 are detachably attached to the upper and lower flanges 2 and 3 via the magnets 22. Both ends can be detachably attached to the upper and lower flanges 2 and 3. For example, both ends of the waterproof cover 5 may be attached to the upper and lower flanges 2 and 3 using fastening members such as bolts and nuts, or the end hard portion 20A itself is formed of a magnet, and the end hard A configuration in which the portion 20A is directly magnetically attached to the upper and lower flanges 2 and 3 may be employed.

  In the above-described embodiment, the soft portion 21 is curved in a substantially U shape that is convex outward in the cover radial direction in a longitudinal sectional view. However, in the present invention, the soft portion is convex inward in the cover radial direction. Or may be curved in a substantially V shape. Further, in the present invention, the soft portion is not curved, and can be formed into a straight shape in a longitudinal sectional view.

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

It is a longitudinal cross-sectional view of the seismic isolation apparatus for demonstrating embodiment of this invention. It is a side view of the seismic isolation apparatus for demonstrating embodiment of this invention. It is a plane sectional view between AA shown in FIG.

Explanation of symbols

1 Seismic isolation laminated rubber 2 Lower flange (support plate)
3 Upper flange (support plate)
4 Laminated part 5 Waterproof cover (Waterproof cover for seismic isolation laminated rubber)
5A, 5B Divided body 10 Rubber layer 11 Internal steel plate (hard plate)
20 Hard part 21 Soft part 22 Magnet 30 Seismic isolation device O Axis

Claims (6)

Waterproofing for seismic isolation laminated rubber covering at least the laminated part, which is attached to a base isolation rubber having a structure in which a plurality of laminated layers of rubber layers and hard plates are alternately interposed between a pair of upper and lower support plates A cover,
A cylindrical shape that extends along the axial direction of the laminated portion and accommodates at least the laminated portion inside,
A hard portion having rigidity extending in the cover circumferential direction, and a flexible soft portion extending in the cover circumferential direction,
A waterproof cover for seismic isolation laminated rubber, wherein both ends are detachably attached to the support plate. In the waterproof cover for seismic isolation laminated rubber according to claim 1,
The waterproof cover for seismic isolation laminated rubber, wherein the plurality of hard portions and the plurality of soft portions are alternately connected in the axial direction. In the waterproof cover for seismic isolation laminated rubber according to claim 1 or 2,
A waterproof cover for seismic isolation laminated rubber, characterized in that it is formed into a cylindrical shape by combining a plurality of divided bodies divided in a vertically split shape. In the waterproof cover for seismic isolation laminated rubber according to any one of claims 1 to 3,
A waterproof cover for seismic isolation laminated rubber, wherein both ends are attached to the support plate via magnets. In the waterproof cover for seismic isolation laminated rubber according to any one of claims 1 to 4,
The waterproof cover for seismic isolation laminated rubber, wherein the soft portion is curved in a longitudinal sectional view along the axial direction. In the seismic isolation device provided with the seismic isolation laminated rubber having a configuration in which a laminated portion formed by alternately laminating a plurality of rubber layers and hard plates is interposed between a pair of upper and lower support plates,
A seismic isolation device comprising the waterproof cover for a seismic isolation laminated rubber according to any one of claims 1 to 5.

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