JP2019108914A - Seismic isolator, and, method for repairing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of cracks in a vibration energy absorbing part in a seismic isolation device or a vibration damping device provided with a vibration energy absorbing part made of an elasto-plastic material, and to repeatedly perform plastic deformation and the like. Even if a minute crack occurs in the vibration energy absorption part, it can be effectively repaired and the device can be used for a longer period of time, which makes it possible to continue using the device for a long period of time. Providing seismic equipment, etc. SOLUTION: A vibration energy absorbing part such as a damper main body 10 and a metal plug 51 is formed by an elasto-plastic material which is an alloy containing lead, tin, steel, or at least one of these metals. This is a seismic isolation device or the like in which a coating portion 20 using a polyurea resin as a base resin is formed on a part or all of the surface of the vibration energy absorbing portion. [Selection diagram] Fig. 1

Description

  The present invention relates to a seismic isolation apparatus and a method of repairing the same.

  Conventionally, in many constructions, a base isolation structure is disposed between the upper structure and the lower structure on the foundation side to absorb energy due to earthquakes and the like. A general seismic isolation structure is composed of seismic isolation isolators and seismic isolation dampers. The cycle is lengthened by seismic isolation isolators against vibrations transmitted from the ground at the time of an earthquake, and its seismic energy is Absorb.

  As a specific example of various seismic isolation devices constituting a seismic isolation structure, for example, in Patent Document 1, it is installed between an upper structure and a lower structure of a structure, and formed by an elastic-plastic material at the time of earthquake A seismic isolation device (seismic isolation damper) has been developed that absorbs seismic energy by plastic deformation of a seismic energy absorbing portion (a seismic isolation damper main body) (see Patent Literature 1).

  Also, as another specific example of the seismic isolation device, a seismic isolation device (a lead rubber rubber bearing isolation bearing) in which a columnar lead plug is disposed in a hollow portion inside the laminated rubber body is also known ( Patent Document 2). This lead-plug laminated rubber type seismic isolation bearing is disposed between two upper and lower structures constituting a building or the like, and the lead plug disposed inside thereof absorbs vibration energy by undergoing plastic deformation, In addition, the above-described laminated rubber body is largely deformed in the horizontal direction to reduce the earthquake input acceleration, thereby exhibiting the seismic energy absorbing performance.

  Each of these seismic isolation devices exhibits a function of preventing damage to a building by the absorption of seismic energy by a vibration energy absorbing portion formed of an elasto-plastic material. However, when plastic deformation of the vibration energy absorbing portion is repeated a predetermined number of times or more, a crack due to metal fatigue may occur on the surface.

  If such a crack is left standing, it may eventually lead to breakage of the vibration energy absorbing portion such as the seismic isolation damper main body, and then the seismic isolation device can no longer absorb the vibration energy. At the time of an earthquake, it becomes impossible to exhibit predetermined seismic isolation performance. As a means to prevent this in advance, a maintenance method is also proposed in which vaseline, grease or the like is applied to the surface of the seismic isolation damper main body to form a coating for reinforcement, thereby suppressing the occurrence of the above cracks in advance. (See Patent Document 1).

  However, in various seismic isolation devices as described above, it is difficult to completely prevent the occurrence of cracks in the vibration energy absorbing portion over a long period equivalent to the service life of the structure in which they are installed. The Also, under the present circumstances, there has been no effective repair method for repairing the energy absorbing part where the crack has occurred until it can be safely used continuously. Therefore, the vibration isolation device having a vibration energy absorbing portion made of an elasto-plastic material has a deformation history at which even a slight occurrence of such a crack as described above or a possibility that such a crack will occur reaches a certain degree or more In fact, the entire equipment had been replaced as having reached its product life.

JP, 2014-1844, A JP-A-9-105440

  The present invention, in a seismic isolation device or a damping device comprising a vibration energy absorbing portion made of an elastic-plastic material, not only prevents the occurrence of cracks in the vibration energy absorbing portion, but also by repeating plastic deformation or the like. Even when a micro crack was generated in the vibration energy absorbing portion, it was effectively repaired to enable the continuation of the use of the device for a longer period of time, thereby providing excellent long-term durability. It aims at providing a seismic isolation system etc.

  As a result of intensive investigations, the inventors of the present invention form a coated portion made of polyurea resin on the surface of the vibration energy absorbing portion in a seismic isolation device or the like in which the vibration energy absorbing portion is formed of an elastic plastic material. As a result, it has been found that the above-mentioned problems can be solved, and the present invention has been completed. More specifically, the present invention provides the following.

  (1) A vibration isolation device or vibration damping device in which a vibration energy absorbing portion is formed by an elasto-plastic material which is an alloy comprising lead, tin, steel, or at least any of these metals. The base isolation apparatus or the damping device in which the film part which makes polyurea resin a base resin is formed in a part or all of the surface of the said vibrational energy absorption part.

  According to the invention of (1), in a seismic isolation apparatus or the like provided with a vibration energy absorbing portion made of an elastic-plastic material, a coated portion made of polyurea resin is formed on the surface of the vibration energy absorbing portion. According to this, it is possible not only to suppress the occurrence of the crack in the vibration energy absorbing part, but also to effectively repair the fine crack, if it occurs, and immediately replace the seismic isolation device Can be avoided. In this way, the service life of the seismic isolation system can be significantly extended.

  (2) A seismic isolation device installed between an upper structure and a lower structure of a structure and absorbing vibration energy, the upper flange being connected to the upper structure, and being connected to the lower structure And a damper body disposed between the upper flange and the lower flange to connect them, the vibration energy absorbing portion is formed by the damper body, according to (1). Seismic isolation device.

  According to the invention of (2), in the general type of seismic isolation device (seismic isolation damper) of the type which is installed between the upper structure and the lower structure of the structure and connected between them by the damper body, (1) It is possible to greatly extend the service life of those vibration isolation devices by enjoying the effects of the invention of the present invention.

  (3) The damper main body includes an upper flange vicinity extending vertically downward from the upper flange, a lower flange vicinity extending vertically upward from the lower flange, and the upper flange and the lower flange. At an intermediate position, a refracting portion that projects and refracts in a horizontal direction from a central axis passing through the centers of the upper flange vicinity and the lower flange vicinity and an inclination from the central axis from the upper flange vicinity The seismic isolation device according to (2), which is formed of an upper inclined portion connected to the refracted portion and a lower inclined portion inclined to the central axis and connected to the refracted portion from the vicinity of the lower flange.

  According to the invention of (3), it is possible to significantly extend the service life of the seismic isolation apparatus including the damper body having the shape as shown in FIG.

  (4) The covering portion is formed only in the vicinity of the upper flange, the vicinity of the lower flange, the refracting portion, the refracting portion of the upper inclined portion, and the refracting portion of the lower inclined portion. The seismic isolation system described in (3).

  According to the invention of (4), in the seismic isolation device described in (3), it is decided to form the coated portion made of polyurea resin only in the part where cracking is particularly likely to occur. This makes it possible to receive the above effect of the invention of (3) efficiently with a minimum amount of material cost and labor.

  (5) The vibration energy absorbing portion is formed of a cylindrical metal plug, and the metal plug is disposed in a hollow cylindrical elastic body formed by alternately laminating an elastic material layer and a rigid material layer. The seismic isolation system described in (1).

  According to the invention of (5), use of the seismic isolation device (layered rubber type seismic isolation bearing with metal plug) in which the columnar lead plug is disposed in the hollow portion inside the laminated rubber body as shown in FIG. 3 The service life can be extended significantly.

  (6) A method of repairing a seismic isolation device or damping device, wherein a vibration energy absorbing portion made of elasto-plastic material which is lead, tin, steel, or an alloy containing these is formed. A method of repairing a seismic isolation device or damping device, comprising applying a coating material comprising a polyurea resin as a base resin to a portion surrounding a crack generated in the energy absorbing portion to form a coating portion covering the crack.

  According to the invention of (6), in a seismic isolation device or the like provided with a vibration energy absorbing portion from an elastic-plastic material, when a minute crack is generated in the vibration energy absorbing portion due to repeated plastic deformation or the like, this is repaired Thus, the use of the device can be continued for a longer period of time.

  According to the present invention, in the seismic isolation device or the damping device including the vibration energy absorbing portion made of an elastic-plastic material, not only the generation of the crack of the vibration energy absorbing portion is suppressed in advance but the plastic deformation is repeated. Even when a micro crack was generated in the vibration energy absorbing portion, it was effectively repaired to enable the continuation of the use of the device for a longer period of time, thereby providing excellent long-term durability. A seismic isolation device etc. can be provided.

It is a perspective view of the seismic isolation damper which is one of the preferable embodiments of the seismic isolation apparatus of this invention. (A) is the figure which looked at the seismic isolation damper of FIG. 1 from the right side in FIG. 1, (b) is the figure which looked at the seismic isolation damper of FIG. 1 from the back side in FIG. It is a perspective view of the metal plug containing laminated rubber type seismic isolation bearing which is another preferable embodiment of the seismic isolation apparatus of this invention. It is a schematic diagram in which it uses for description of the internal structure of the metal plug containing laminated rubber type seismic isolation bearing of FIG. It is a graphical representation of the data of the test results for confirming the long-term durability of the seismic isolation device of the present invention, and is a graph showing the correlation between the number of repetitions of plastic deformation due to vibration and the amount of absorbed energy per vibration cycle. . It is a graph-ized data of the test result which confirms the long-term durability of the seismic isolation apparatus of this invention, and is a graph which shows the correlation of the accumulated energy amount by vibration, and the absorbed energy amount per 1 cycle of vibration.

  Hereinafter, although the preferable embodiment of this invention is described, this invention is not limited to this.

<Base isolation device or damping device>
The present invention can be preferably applied to vibration isolation devices or vibration control devices in general provided with an energy absorbing portion made of an elastic-plastic material. The energy absorbing portion made of an elasto-plastic material means a member having an effect of absorbing vibration energy by plastic deformation with respect to vibration with a large amplitude at the time of earthquake. Specifically, the seismic isolation damper main body in the above-described seismic isolation damper, or a metal plug in a laminated rubber type seismic isolation bearing with a metal plug corresponds thereto.

Seismic isolation damper
The seismic isolation damper 1 is disposed between the upper structure and the lower structure of the structure to absorb vibrational energy. As shown in FIGS. 1 and 2, the seismic isolation damper 1 has an upper flange 2 connected to the upper structure, a lower flange 3 connected to the lower structure, and a space between the upper flange 2 and the lower flange 3. It comprises the damper main body 10 which arrange | positions and connects these. In the seismic isolation damper 1, a lead-made damper main body 10 described in detail below acts as a vibration energy absorbing portion. And in the seismic isolation damper 1, the coating part 20 which mainly consists of polyurea resin is formed in one part or all part of the surface of this damper main body 10. As shown in FIG.

  The upper flange 2 of the seismic isolation damper 1 is connected to the upper structure, and the lower flange 3 is connected to the lower structure. In the seismic isolation damper 1, the damper main body 10 serving as a vibration energy absorbing portion plastically deforms to absorb vibration energy with respect to a vibration having a large amplitude caused by an earthquake.

  In the case of the seismic isolation damper 1, when vibration of a minute amplitude is generated in the structure due to the response of the structure to a small or medium earthquake, wind, traffic vibration, or regular movement of the ground, the upper flange 2 is a vibration of the upper structure. , And the lower flange 3 follows the vibration of the lower structure. And the seismic isolation damper 1 can also make the vibration of a structure converge by the elastic deformation of the damper main body 10 which connects these between the upper flange 2 and the lower flange 3 and absorbing vibration energy.

  Here, in the conventional seismic isolation damper, for example, when the above-mentioned plastic deformation is repeated many times, in particular, the upper flange vicinity portion 15, the lower flange vicinity portion 11, the refracting portion 13, the refracting portion of the upper slope portion 14 Cracks due to metal fatigue were likely to occur near 13 and near the bent portion 13 of the lower inclined portion 12. Furthermore, when the vibration of 30 to 40 times the number of times of occurrence of the crack is repeated, there is a possibility that the damper main body 10 may be broken.

  On the other hand, in the seismic isolation damper 1 of the present invention, as described below, the coating portion 20 made of polyurea resin is formed on the surface of the damper main body 10 that is the vibration energy absorbing portion. The occurrence of the above-mentioned cracks in 10 is suppressed. Further, even if a minute crack occurs, it can be effectively repaired to avoid an immediate replacement of the seismic isolation damper 1. The details of the damper main body 10 in which the coating portion 20 is formed will be described later again.

  The upper flange 2 and the lower flange 3 are formed of a plate-like steel material (for example, SS400) having a square shape in plan view. The upper flange 2 and the lower flange 3 may be, for example, a square having a side of 750 mm and a thickness of 38 mm in a plan view. The upper and lower flanges can have any size and thickness depending on the required seismic isolation performance.

  The upper flange 2 is formed with a plurality of through holes 2a penetrating in the vertical direction in FIG. 1, and the lower flange 3 is formed with a plurality of through holes 3a penetrating in the vertical direction in FIG. The upper flange 2 is fixed to the upper structure by a fixing bolt (for example, M30) inserted into the through hole 2a. The lower flange 3 is fixed to the lower structure by a fixing bolt (for example, M30) inserted through the through hole 3a. Then, the upper flange 2 is disposed at a position where the lower flange 3 has moved by 886 mm in the vertical direction, for example. Then, the damper main body 10 is disposed in a space to be installed to both the lower surface of the upper flange 2 and the upper surface of the lower flange 3 with respect to both the flanges.

[Damper body]
The damper body 10 is formed such that a columnar body having a circular cross-sectional shape is bent in the forward direction in FIG. 1 at a substantially intermediate position in the space between the upper flange 2 and the lower flange 3. Specifically, in the damper main body 10, the lower flange vicinity portion 11, the lower inclined portion 12, the refracting portion 13, the upper inclined portion 14 and the upper flange vicinity portion 15 are sequentially formed in order from the lower side to the upper side .

  Also, the damper body 10 is generally formed using lead or an alloy containing lead as an elasto-plastic material. Among these, lead purity is preferably 99.99% or more.

  The damper body 10 can have any height depending on the required seismic isolation performance and the installation space of the structure. Moreover, the diameter of the cross section of each part in 1st Embodiment described below can also set the damper main body 10 as arbitrary dimensions according to the seismic isolation performance requested | required, and the installation space of a structure.

  Lower flange vicinity 11 is disposed centering on central axis C (refer to FIG. 2) passing through the centers of upper flange vicinity 15 and lower flange vicinity 11 and fixed to lower flange 3 by homogen welding, lower flange 3. Extends vertically upwards from the Further, in the lower flange vicinity portion 11, the diameter of the cross section of the portion fixed to the lower flange 3 is formed wider than the portion connected to the lower inclined portion 12.

  The lower inclined portion 12 is inclined with respect to the central axis C (see FIG. 2) and continues to the refracting portion 13 while drawing an arc from the lower flange vicinity portion 11. The refracting portion 13 projects in the horizontal direction from the central axis C (see FIG. 2) and refracts into a substantially V shape. The upper inclined portion 14 is continuous to the refracting portion 13 while being inclined with respect to the central axis C (see FIG. 2) and drawing an arc from the upper flange vicinity portion 15.

  The upper flange proximal portion 15 is disposed about the central axis C (see FIG. 2), is fixed to the upper flange 2 by homogen welding, and extends downward from the upper flange 2 in the vertical direction. Further, in the upper flange vicinity portion 15, the diameter of the cross section of the fixing portion with the upper flange 2 is formed wider than the portion connected to the upper inclined portion 14.

[Coated part]
The polyurea resin which forms the film part 20 is a synthetic resin which has a urea bond obtained by making a polyisocyanate compound and an amine compound (special mixed resin) which has active hydrogen collide and mix and make it react chemically. This polyurea resin is characterized by ultra-rapid curing and tough physical properties (high tear strength, tensile strength, extensibility, following ability, weatherability, corrosion resistance, etc.), and coating of floors, ceilings, etc. of ships, trucks and buildings. It is used as an explosion proof measure for wood and pentagon. The resin for forming the film portion 20 may be any resin that uses a polyurea resin as a base resin, and other additive resins, fillers, etc. are added in an appropriate amount within the range that does not inhibit the effects of the present invention. It may be. The polyurea resin in the present specification includes all resin materials mainly composed of polyurea resin as described above.

It is preferable that the thickness of the film part 20 which consists of such a polyurea resin is 2 mm or more. The coated portion can be a film having physical properties such as tensile strength of 10 N / mm ² or more and elongation ability of 200% or more. Then, by forming such a coating portion 20 on the entire surface of the damper main body 10 or the damaged portion as described above, a crack or break occurs in the damper main body 10 even when deformation due to earthquake is repeated. Can be suppressed.

  The coating portion 20 is preferably formed on the entire surface of the damper main body 10, but may be formed particularly on a portion where cracking or breakage easily occurs due to metal fatigue. Specifically, as shown in FIGS. 1 and 2, the entire periphery of the portion extending from the lower flange portion 11 to the lower inclined portion 12, the refractive portion 13, the outer periphery of the lower inclined portion 12 and the outer periphery of the upper inclined portion 14 The effect of the present invention can also be achieved by forming it in the vicinity of the portion 13 and in the vicinity of the upper flange 15 on the entire periphery of the portion connected to the upper inclined portion 14 or the like.

<Laminated rubber type seismic isolation bearing with metal plug>
FIG. 3 is a perspective view of a metal plug-in laminated rubber type seismic isolation bearing 5 which is another preferred embodiment of the seismic isolation device of the present invention. Further, FIG. 4 is a schematic view for explaining the internal structure of the metal plug-in laminated rubber type seismic isolation bearing 5 as well.

  The metal plug-in laminated rubber type seismic isolation bearing 5 is disposed between the structure at the lower part of the structure and the structure at the upper side thereof to absorb vibrational energy. As shown in FIG. 3 and FIG. 4, the metal plug-in laminated rubber type seismic isolation bearing 5 comprises an elastic body 511 formed by alternately laminating a plurality of elastic material layers and a rigid material layer, and a columnar metal plug 51 The metal plug 51 is disposed in a cylindrical hollow portion formed in the vertical direction inside the elastic body 511 in such a manner as to be restrained on the inner surface of the hollow portion without a gap. In addition, the metal plug-in laminated rubber type seismic isolation bearing 5 is in contact with the lower surface and the upper surface of the metal plug 51 respectively, and the upper flange 512 and the lower flange 513 attached to the lower surface and the upper surface of the elastic body 511 by bolts. Prepare. For example, the lower flange 513 side is fixed to one structure such as a foundation, the other structure such as a building is placed on the upper flange 512 side, and vertical from the building etc via the upper flange 512 It is installed and used to receive a load.

  In the laminated rubber rubber seismic isolation bearing 5 having such an entire configuration, the metal plug 51 disposed in the hollow portion of the elastic body 511 is restrained by the elastic body 511 without a gap. is necessary. Further, in the metal plug-in laminated rubber seismic isolation bearing 5, this metal plug 51 acts as a vibration energy absorbing portion. Then, in the metal plug-in laminated rubber seismic isolation bearing 5, the coated portion 20 made of the above-mentioned polyurea resin is formed on a part or all of the surface of the metal plug 51. In FIG. 4, an example in which the coated portion 20 is formed on the entire side surface of the metal plug 51 is illustrated. By forming the coating portion 20 on the surface of the metal plug 51 in this manner, as in the case of the above-described damper main body, even if deformation due to earthquake is repeated, cracking or breakage occurs in the metal plug 51. Can be suppressed.

  In the metal plug-in laminated rubber seismic isolation bearing 5, the metal plug 51 is usually made of tin or an alloy containing tin. The shape of the metal plug 51 is preferably cylindrical as shown in FIGS. 3 and 4, but may be another shape, for example, an oval or a square. Also, although one metal plug 51 may be provided for the elastic body 511, instead of this, a plurality of hollow portions are formed in one elastic body 511, and the metal plugs 51 are respectively disposed in the plurality of hollow portions. Then, the metal plug-containing laminated rubber type seismic isolation bearing 5 may be configured. The height of the metal plug 51 is generally 300 mm or more and 600 mm or less, but can be any height according to the required seismic isolation performance and the installation space of a building. Further, the metal plug 51 can have any diameter depending on the required seismic isolation performance and the installation space of the building, including the cross-sectional diameter and the balance with the size of the elastic body 511.

  The elastic body 511 is a cylindrical or prismatic elastic body in which a plurality of elastic material layers made of an elastic material and a rigid material layer made of a rigid material are alternately laminated. Examples of the material of the elastic material layer include natural rubber, silicone rubber, high damping rubber, urethane rubber, chloroprene rubber and the like, with preference given to natural rubber. As a thickness of each layer of an elastic material layer, although a thing about 1 mm or more and 30 mm or less in a no-load state is preferable, it is not limited to this.

  Examples of the material of the rigid material layer include steel plate, carbon fiber, fiber reinforced synthetic resin plate such as glass fiber or aramid fiber or fiber reinforced hard rubber plate etc. The thickness is 10 mm for each thick rigid plate Although not less than about 50 mm and about 1 mm to 6 mm is preferable for the other layers, the present invention is not limited thereto, and the number thereof is not particularly limited. Further, as to the upper flange 512 and the lower flange 513, plate-like members made of a rigid material such as the above-described steel plate can be appropriately selected and used.

<Method for repairing seismic isolation device or damping device. >
The method of repairing a seismic isolation device or damping device of the present invention can be preferably applied to the repair of a seismic isolation device or a general vibration damping device provided with an energy absorbing portion made of an elastic-plastic material. In such a seismic isolation device, when the above crack is generated in, for example, the energy absorbing portion of the damper main body 10 or the like after installation in a building, the crack is generated by using this method. It is possible to restore and continue using the seismic isolation system for a longer period of time.

  Specifically, this repair is carried out by applying a coating material based on the above-mentioned polyurea resin as a base resin to the portion surrounding the above-mentioned crack to form a coated portion covering the crack. As a result, regardless of whether or not the coating portion 20 is formed in advance in the vibration energy absorbing portion, when a fine crack is generated in the vibration energy absorbing portion due to repeated plastic deformation or the like, this is repaired; The use of the device can be continued for a longer period of time.

  Hereinafter, the present invention will be described in detail by way of examples. As a test example, a horizontal direction load test of a reduction specimen of a lead damper (one having a shape shown in FIGS. 1 and 2) coated with a polyurea resin was carried out. The scale factor of the lead damper reduction specimen was one-fourth of the full-scale lead damper with a diameter of 180 mm and a diameter of 45 mm. In this test, Extremee, manufactured by Linolining, USA, was used as a polyurea resin base. Table 1 shows the components and blending ratios of the polyurea resin base used. Table 2 shows the properties of the polyurea resin coating film produced from the above polyurea resin base.

  Each of the test samples shown in Table 3 was used as the “lead damper reduction test body”. The lead damper was formed of lead (Pb) having a purity of 99.99% or more. The surface condition of the lead damper was that the lead surface had no cracks (Example 1 and Comparative Example 1) and a crack due to fatigue, and a 7 mm notch was made in the upper flexible portion using a metal saw Two levels of (Example 2 and Comparative Example 2) were used. The coating film made of polyurea resin had a thickness of 2.5 mm and was formed on the entire surface of the test body (Examples 1 and 2) and no coating film (Comparative Example 1 and Comparative Example 2) 2 Level. The cut depth of 7 mm of the test sample corresponds to a crack with a depth of 28 mm in actual size because the scale ratio of the test sample is 1⁄4.

<Basic characteristic test>
As a basic characteristic test, an amplitude of ± 37.5 mm, an excitation frequency of 0.33 Hz, and a repetition frequency of 4 cycles were used, and a yield load at the third cycle was confirmed. Table 4 shows the experimental results. The values in parentheses in the table indicate the ratio to the test sample of Comparative Example 1. From the test results of Example 1, it can be seen that the yield load is improved by about 20% by the application of the polyurea resin. In addition, the yield load of the test body of Comparative Example 2 in which the incision is 7 mm is 0.85 times that of the test body of Comparative Example 1 in which the incision is not made, but in the test body of Example 2, the same ratio is 1.0. It can be seen that the application of the polyurea resin improves the yield load to the same level as that of the test sample of Comparative Example 1 having no cuts.

<Repetitive load test>
Furthermore, the cyclic loading test was performed. The test conditions were an amplitude of ± 75 mm and an excitation frequency of 0.33 Hz, and the number of repetitions at break and the total energy absorption amount were confirmed. The test bodies of Examples 1 and 2 and Comparative Example 1 used in the above-described <Basic property test> were used as the test bodies. As a test result, FIG. 5 shows the relationship between the number of repetitions and one cycle absorption energy, and FIG. 6 shows the relationship between accumulated absorption energy and one cycle absorption energy. Comparing the test body 1 of Example 1 with the test body of Comparative Example 1, the number of repetitions and the cumulative absorption energy of the test body of Example 2 increase approximately twice by the application of the polyurea resin, The accumulated absorbed energy is more than twice that of Comparative Example 1. Further, in each of the test bodies of Examples 1 and 2, the decrease in one-cycle absorbed energy with repetition is slower than that of the test body of Comparative Example 1.

  From the above test results, according to the present invention, in a seismic isolation device or the like provided with a vibration energy absorbing portion made of an elastic-plastic material, not only suppression of generation of cracks in the vibration energy absorbing portion but also plastic deformation Even when a micro crack is generated in the vibration energy absorbing portion due to repetition etc., this is effectively repaired, and the use of the device for a long time can be continued, whereby long-term durability can be achieved. It was confirmed that excellent vibration isolation equipment etc could be provided.

1 Seismic isolation damper 2 upper flange 3 lower flange 10 damper body (vibration energy absorbing part)
DESCRIPTION OF SYMBOLS 11 lower flange vicinity part 12 lower inclined part 13 refraction | bent part 14 upper inclined part 15 upper flange vicinity part 20 coating | coated part 5 laminated rubber type seismic isolation bearing with metal plug 51 metal plug (vibration energy absorption part)
511 elastic body 512 upper flange 513 lower flange

Claims (6)

It is a seismic isolation device or a damping device in which a vibration energy absorbing portion is formed by an elastoplastic material which is lead, tin, steel, or an alloy containing at least one of these metals,
The base isolation apparatus or damping apparatus in which the film part which makes polyurea resin a base resin is formed in a part or all of the surface of the said vibrational energy absorption part. A seismic isolation device installed between upper and lower structures of a structure and absorbing vibration energy,
And an upper flange connected to the upper structure, a lower flange connected to the lower structure, and a damper disposed between the upper flange and the lower flange to connect them.
The seismic isolation device according to claim 1, wherein the vibration energy absorbing unit is formed by the damper.   The damper is provided at a substantially intermediate position between the upper flange and the lower flange, in the vicinity of the upper flange extending vertically downward from the upper flange, the lower flange adjacent portion extending vertically upward from the lower flange, A refracting portion projecting horizontally from the central axis passing through the centers of the upper flange vicinity portion and the lower flange vicinity portion, and refracting from the central axis, and continuing from the upper flange vicinity portion to the refracting portion The seismic isolation device according to claim 2, formed from an upper inclined portion, and a lower inclined portion which is inclined with respect to the central axis and extends from the vicinity of the lower flange to the refracting portion.   The coating portion is formed only in the vicinity of the upper flange, the vicinity of the lower flange, the refraction portion, the vicinity of the refraction portion of the upper inclined portion, and the vicinity of the refraction portion of the lower inclined portion. Seismic isolation device described in.   The vibration energy absorbing portion is formed of a cylindrical metal plug, and the metal plug is disposed in a hollow cylindrical elastic body formed by alternately laminating an elastic material layer and a rigid material layer. The seismic isolation apparatus according to claim 1. A method of repairing a seismic isolation device or damping device, wherein a vibration energy absorbing portion made of an elasto-plastic material which is lead, tin, steel or an alloy containing these is formed.
A coating method using a polyurea resin as a base resin is applied to a portion surrounding a crack generated in the vibration energy absorbing portion, thereby forming a coated portion covering the crack.

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