JP2010101383A - Plug for base isolation structure, and base isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug which exhibits a satisfactory performance as a plug, and which is uniformly broken down. <P>SOLUTION: In the plug for a base isolation structure, three or more layers of at least two kinds of plug materials containing different compositions are laminated. In the plug for the base isolation structure, the plug material is made of composition for the plug containing an elastomer composition prepared by blending an elastomer component with a reinforcing filler and a powder. The base isolation structure using the above plug is also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plug for a base isolation structure and a base isolation structure using the plug.

  2. Description of the Related Art Conventionally, seismic isolation structures in which soft plates having viscoelastic properties such as rubber and hard plates such as steel plates are alternately stacked have been used as bearings for seismic isolation devices. In such a base-isolated structure, for example, a plug formed by forming a hollow portion at the center of a laminate composed of a soft plate and a hard plate, and forming a uniform composition inside the hollow portion There is something that has been press-fitted.

  As the plug, a plug made entirely of lead is often used, and when the laminated body undergoes shear deformation, the plug is plastically deformed to absorb vibration energy. However, lead has a large environmental load and a high cost for disposal. For this reason, lead plugs are being changed to plugs using alternative materials due to environmental load problems, and it is possible to develop plugs with sufficient damping performance, displacement followability, etc. using lead alternative materials. Has been tried. For example, in Japanese Patent Publication No. 7-84815, instead of a lead plug, a solid material and a viscous material made of a liquid material such as mineral oil or vegetable oil are sealed in the hollow portion of the laminate, and the gap between the solid materials is made viscous. A seismic isolation device has been proposed that is filled with the body.

  However, in this seismic isolation device using a liquid substance such as mineral oil or vegetable oil as a viscous material, a solid substance is precipitated in the liquid substance when used for a long time, and dispersibility deteriorates. As a result, there is a possibility that the attenuation performance changes locally and stable attenuation performance cannot be exhibited.

In contrast, JP-A-2006-316990 discloses a plastic fluid material and a hard filler made of metal, hard resin, hard fiber, etc. in the hollow portion of the laminate so that the composition is as uniform as possible. A filled seismic isolation device is disclosed, and it is disclosed that a material having a shear yield stress in a specific range is preferable as the plastic fluidizing material.
Japanese Patent Publication No. 7-84815 JP 2006-316990 A

  However, the above-described conventional technology for replacing a lead plug cannot provide a seismic isolation structure plug having sufficient damping characteristics, displacement followability, etc. as a plug, so there is room for improvement in terms of performance.

  Furthermore, a plug having a uniform composition as in the prior art is difficult to mold a plug having a completely uniform composition due to molding unevenness or the like, and is applied to the plug when a displacement is applied to the seismic isolation structure. Since the shearing force varies depending on the position, there is a case where the damping performance cannot be sufficiently exhibited without being uniformly broken in the seismic isolation structure when the displacement occurs. The plug for seismic isolation structure exhibits damping performance due to friction between the powder and the friction between the powder and the elastomer composition by breaking the plug when the displacement is applied. Because. For this reason, there is a demand for a plug that can be uniformly collapsed and sufficiently exhibit the performance as a plug.

  An object of the present invention is to advantageously solve the above-mentioned problems, and a plug for a seismic isolation structure according to the present invention is an exemption obtained by laminating three or more layers of at least two types of plug materials having different compositions. A plug for a seismic structure, wherein the plug material is manufactured from a plug composition containing an elastomer composition obtained by blending an elastomer component with a reinforcing filler and a powder. . By using a plug composition containing an elastomer composition obtained by blending a reinforcing filler with an elastomer component and a powder in this way, a seismic isolation structure having sufficient damping performance, displacement followability, etc. A plug for a base-isolated structure that can provide a body can be obtained. In addition, by providing at least two types of plug materials and providing a portion that is easy to collapse in the plug, it is possible to obtain a plug for a seismic isolation structure that is easy to collapse as a whole and that can sufficiently exhibit performance. In addition, the plug for seismic isolation structures of this invention can be made into arbitrary shapes, such as polygonal columns, such as a triangular column and a quadratic column, besides a cylinder.

  In the plug for a seismic isolation structure of the present invention, it is preferable that the plug material has different hardness. Here, the hardness is obtained by measurement using a durometer (JIS K 6253). In this case, by laminating plug materials having different hardnesses, the low-hardness portion collapses preferentially so that it tends to collapse uniformly as a whole. Therefore, the plug for seismic isolation structure which can fully exhibit performance can be obtained.

  In the plug for a seismic isolation structure of the present invention, it is preferable that the plug material is manufactured from the plug composition having a different ratio of the powder to the elastomer composition. In this case, by providing a hard, hard-to-break layer with a high powder ratio and a soft, easy-to-break layer with a low powder ratio, the low-powder layer collapses preferentially and the entire plug Becomes easy to collapse uniformly. Therefore, the plug for seismic isolation structure which can fully exhibit performance can be obtained.

  In the plug for a seismic isolation structure according to the present invention, it is preferable that the plug material is manufactured from the plug composition in which the powder has a spherical shape and an indefinite shape. In this case, the plug material using irregular powder has better damping performance and is less likely to collapse than the plug material using spherical powder. You can get the plug for seismic isolation structure.

  In the plug for a seismic isolation structure of the present invention, it is preferable that the plug material is manufactured from the plug composition having a different content of the reinforcing filler. In this case, by providing a hard, hard-to-break layer with a high reinforcing filler content, and a soft, easy-to-break layer with a low reinforcing filler content, the reinforcing filler content is low. The layer collapses preferentially, and the plug tends to collapse uniformly as a whole. Therefore, the plug for seismic isolation structure which can fully exhibit performance can be obtained.

  In the plug for a seismic isolation structure of the present invention, the powder is preferably metal powder and / or metal compound powder, and particularly preferably iron powder. Iron powder is inexpensive and has high breaking strength, and by using iron powder, the plug can exhibit excellent damping performance over a long period of time.

  In the plug for a seismic isolation structure according to the present invention, the reinforcing filler is preferably carbon black and / or silica. Since carbon black and silica have a large effect of improving the viscosity of the elastomer composition by interaction with the elastomer component, the flow resistance of the plug increases, and as a result, the plug damping effect increases.

  In another preferred embodiment of the plug for a seismic isolation structure of the present invention, at least a part of the elastomer component is uncrosslinked. In this case, after the plug receives a history of large deformation, when the position of the plug returns to the origin again, the plug can return to its original shape. Can be maintained.

  In another preferred embodiment of the plug for a seismic isolation structure of the present invention, the content of the powder is 50 to 74% by volume. In this case, the friction between the powders at the time of deformation and the flow resistance between the powder and other components are sufficiently large, so that a sufficient damping effect is obtained, and the repeated durability is sufficiently ensured. Also, moldability is good.

  In another preferable example of the plug for a seismic isolation structure of the present invention, the amount of the reinforcing filler in the elastomer composition is 60 to 150 parts by mass with respect to 100 parts by mass of the elastomer component. In this case, the viscosity and flow resistance of the elastomer composition are sufficiently high, the plug can exhibit a sufficient damping effect, kneading is easy, a uniform composition can be easily obtained, and repeated stability of the plug Is also good.

  In the plug for a seismic isolation structure of the present invention, the particle diameter of the powder is preferably 0.1 μm to 2 mm, and more preferably 1 μm to 150 μm. In this case, handling of the powder is easy and the damping performance of the plug is sufficiently high. Here, the particle diameter of the powder is determined by particle diameter measurement by laser diffraction (JIS Z8825-1), and in the method by laser diffraction, the average of the major axis and the minor axis of the powder particles (taken as a spherical shape). ) Is a value obtained by measuring.

  Further, the seismic isolation structure of the present invention is a laminate in which rigid plates having rigidity and elastic plates having elasticity are alternately laminated, having through holes extending in the laminating direction, and both ends in the laminating direction are made of elastic plates. And a plug that is press-fitted into the through-hole of the laminate and is longer than the thickness of the laminate, and is attached to both ends of the laminate and the plug in the stacking direction, and a part of the plug is located inside A seismic isolation structure comprising a flange, and the plug is the above-described seismic isolation structure plug. In this way, it is possible to provide a seismic isolation structure using a plug that easily collapses uniformly and can sufficiently exhibit damping performance.

  In another preferred embodiment of the seismic isolation structure of the present invention, the plug is formed by stacking plug materials having different hardnesses, and the plug has a higher hardness than the lowest plug material in the plug. The total thickness of the layer made of the material is thicker than the total thickness of the layer made of the plug material having the lowest hardness. In general, a plug with higher hardness has a higher damping performance. In this way, a plug having a sufficient damping characteristic, displacement followability, etc., which is easy to collapse uniformly while maintaining the damping performance sufficiently high. The used seismic isolation structure can be provided.

  In another preferred embodiment of the seismic isolation structure of the present invention, the plug is formed by laminating a plug material produced from the plug composition having a different ratio of the powder and the elastomer composition, For plugs with a total powder thickness of plug material made from a plug composition with a higher powder ratio than the plug composition with the lowest powder ratio in the plug, the lowest powder ratio It is thicker than the total thickness of the layer made of the plug material manufactured from the composition. In this way, it is possible to provide a seismic isolation structure using a plug that is easily collapsed uniformly while maintaining sufficiently high damping performance, and has sufficient damping characteristics, displacement followability, and the like.

  In another preferred embodiment of the seismic isolation structure of the present invention, the plug is formed by laminating a plug material produced from the plug composition, wherein the powder has a spherical shape and an indefinite shape. A layer made of a plug material made from a plug composition containing a spherical powder in which the total thickness of the plug material made from the plug composition containing an amorphous powder in the plug is It is thicker than the total thickness. In this way, it is possible to provide a seismic isolation structure using a plug that is easily collapsed uniformly while maintaining sufficiently high damping performance, and has sufficient damping characteristics, displacement followability, and the like.

  In another preferred embodiment of the seismic isolation structure of the present invention, the plug is formed by laminating plug materials produced from the plug compositions having different contents of the reinforcing filler, in the plug. The total thickness of the layer of the plug material made from the plug composition having a higher reinforcing filler content than the plug reinforcing composition having the lowest reinforcing filler content is It is thicker than the total thickness of the layer made of the plug material produced from the plug composition having the lowest rate. In this way, it is possible to provide a seismic isolation structure using a plug that is easily collapsed uniformly while maintaining sufficiently high damping performance, and has sufficient damping characteristics, displacement followability, and the like.

  In the seismic isolation structure of the present invention, a layer made of a plug material having a high hardness, a layer made of a plug material made from a plug composition having a high powder ratio, and a plug composition containing an amorphous powder The thickness of the layer made of the plug material manufactured from the above or the layer made of the plug material manufactured from the plug composition having a high content of the reinforcing filler is the sum of the thickness of the rigid plate and the thickness of the elastic plate. It is preferable that it is 2 times or more. When a lateral displacement is applied to the seismic isolation structure, a large shearing force is applied to the part where the plug and rigid plate are in contact. With this configuration, there are always two layers of plug material that are difficult to collapse. Since it comes into contact with the above rigid plate, the plug can be uniformly broken by appropriately transmitting the shearing force in the lateral direction to the layer made of the plug material which is not easily broken. Note that the thickness of the layer made of the plug material that does not easily collapse is more preferably less than four times the sum of the thickness of the rigid plate and the thickness of the elastic plate. By setting the thickness to an appropriate thickness, the uniform collapse of the plug can be caused more reliably.

  In the seismic isolation structure of the present invention, a layer made of a plug material having a high hardness, a layer made of a plug material made from a plug composition having a high powder ratio, and a plug composition containing an amorphous powder The layer made of the plug material manufactured from the above or the layer made of the plug material manufactured from the plug composition having a high content of the reinforcing filler is in a position where it abuts on at least two adjacent rigid plates. It is preferable. With this configuration, since the layer made of the plug material that does not easily collapse always comes into contact with two or more rigid plates, the lateral displacement is appropriately transmitted to the layer made of the plug material that does not easily collapse so that the plug is made uniform. Can be broken.

  In another preferred embodiment of the seismic isolation structure of the present invention, the layers located at both ends of the plug are made of a layer made of a plug material having a high hardness and a composition for a plug having a high powder ratio. A layer made of a plug material, a layer made of a plug material made of a plug composition containing an amorphous powder, or a plug material made of a plug composition having a high reinforcing filler content The layers at both ends have a thickness that makes contact with the elastic plate adjacent to the flange. If comprised in this way, the plug located in the periphery of a flange (interface of a flange and an elastic board) which is easy to apply a shearing force when a lateral displacement is applied to the seismic isolation structure is made of a plug material that does not easily collapse. Therefore, the plug can be uniformly broken by appropriately transmitting the lateral displacement to the layer made of the plug material which is not easily broken. In addition, it is more preferable that the layers at both ends of the plug have a thickness so as to be located from the flange to the rigid plate (the rigid plate closest to the flange) beyond the elastic plate adjacent to the flange. If the displacement is applied to the seismic isolation structure, the part of the plug that is stressed by the flange and the rigid plate closest to the flange is made of a plug material that is hard to break. Can be broken.

  According to the present invention, it is possible to provide a plug for a seismic isolation structure that has good dispersibility, has sufficient damping performance, displacement followability, and the like, and easily collapses uniformly when a displacement is applied. Moreover, the seismic isolation structure using such a plug for seismic isolation structures can be provided.

<Composition for plug>
Below, the composition for plugs used for manufacture of the plug material which comprises the plug for seismic isolation structures of this invention is demonstrated in detail. This composition for plugs is characterized by containing an elastomer composition obtained by blending a reinforcing filler in an elastomer component and powder.

  In order to provide a plug for a seismic isolation structure having sufficient damping performance, displacement followability, etc., the inventors made a plug from only various powders and used the plug for the seismic isolation structure. As a result, the powders were rubbed and cracked, and a plug having sufficient durability could not be obtained. In order to solve this problem, the present inventors have further studied, and as a result, produced a plug from a composition containing an elastomer composition in which a reinforcing filler is blended with an elastomer component and a powder. And it discovered that the plug for seismic isolation structures which has sufficient durability, a damping characteristic, displacement followability, etc. was obtained by using this plug for a seismic isolation structure. In addition, since the damping effect by a plug is small when using the elastomer composition which does not contain a reinforcing filler, the composition for plugs concerning this invention needs to contain a reinforcing filler.

  As the elastomer component used in the plug composition, those exhibiting rubber elasticity at room temperature, for example, rubbers such as natural rubber and synthetic rubber, and thermoplastic elastomers can be used. Among these, natural rubber, synthetic rubber, etc. It is preferable to use a rubber. Natural rubber and synthetic rubber-based polymers are viscoelastic and show some elasticity, but have great plasticity, can follow large deformations, and can re-aggregate in the same state again when returning to the origin after vibration. When the elastomer component is rubber (that is, when the elastomer composition is a rubber composition), the damping performance of the plug is improved and the durability is also improved. More specifically, the elastomer component includes natural rubber (NR), polyisoprene rubber (IR), polybutadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), ethylene-propylene rubber, nitrile. Rubber, butyl rubber, halogenated butyl rubber, acrylic rubber, polyurethane, silicone rubber, fluorinated rubber, polysulfide rubber, hyperon, ethylene vinyl acetate rubber, epichlorohydrin rubber, ethylene-methyl acrylate copolymer, styrene elastomer, urethane elastomer, polyolefin Based elastomers and the like. These elastomer components may be used alone or in a blend of two or more.

  The elastomer component is preferably at least partially, preferably all uncrosslinked, and more specifically unvulcanized. When the elastomer component is completely cross-linked, it deforms when subjected to large deformation, but the position of the powder cannot be changed during deformation, and it becomes impossible to follow the deformation at a certain limit point. The elastomer part is broken or tries to return to its original shape by the repulsive force of the crosslinked elastomer part. If the cross-linked elastomer part breaks, the plug will not return to its original shape even if the plug position returns to the origin, so that the damping performance gradually decreases, and the repulsive force of the cross-linked elastomer part works. The original attenuation performance cannot be exhibited. On the other hand, if the elastomer component is uncrosslinked, it is possible to follow deformation, and when the plug returns to the origin again after receiving a history of large deformation, hydrostatic pressure is applied to the entire plug. As a result, the plug can return to its original shape, and as a result, the same performance as the initial stage can be maintained for a long time. When the number of crosslinking points is very small, or when only the plug surface is crosslinked, the original shape can be restored after the plug is deformed. The state which has not passed through includes a partially crosslinked state.

  The reinforcing filler used in the plug composition is a substance that reinforces the elastomer component and has a strong cohesive strength between itself and the elastomer component. The bonding force increases the viscosity of the entire elastomer composition, and as a result, has an effect of improving the damping performance of the plug. Generally, a plug of a seismic isolation structure absorbs energy generated by an earthquake (for example, converts it into heat, etc.) to exhibit a damping effect. Therefore, the damping effect increases as the flow resistance of the plug increases. Become. On the other hand, when a reinforcing filler is blended in the elastomer component, the flow resistance of the elastomer composition increases, and a plug having sufficient damping performance, displacement followability, and the like can be obtained.

  As the reinforcing filler, carbon black and silica are preferable, and carbon black is particularly preferable in that the effect of improving the viscosity of the elastomer composition by interaction with the elastomer component is great. Here, examples of the carbon black include SAF, ISAF, and HAF grades. Among these, fine particles such as SAF and ISAF grades having a large surface area are preferable. Examples of silica include wet silica, dry silica, and colloidal silica. These reinforcing fillers may be used alone or in combination of two or more.

  The blending amount of the reinforcing filler in the elastomer composition is preferably in the range of 60 to 150 parts by mass with respect to 100 parts by mass of the elastomer component. When the compounding amount of the reinforcing filler is less than 60 parts by mass, the viscosity and flow resistance of the elastomer composition are low, and the damping performance of the plug tends to be insufficient. On the other hand, when the compounding amount of the reinforcing filler exceeds 150 parts by mass, kneading is difficult, it becomes difficult to obtain a uniform composition, and the repeated stability of the plug is lowered.

  It is preferable to add a resin to the elastomer composition. Although the above elastomer composition contains a reinforcing filler, the damping performance tends to decrease when the plug composition undergoes large deformation. On the other hand, when the elastomer composition contains a resin in addition to the reinforcing filler, the damping performance of the plug can be improved even during large deformation. The resin also acts as a processing aid, and can facilitate kneading of the plug composition.

  As said resin, what has the effect | action as a tackifier is preferable, More specifically, a phenol resin, a rosin resin, a dicyclopentadiene (DCPD) resin, a dicyclopentadiene-isoprene copolymer, C5 type | system | group Petroleum resin, C9 petroleum resin, alicyclic petroleum resin, petroleum resin obtained by copolymerizing C5 fraction and C9 fraction, xylene resin, terpene resin, ketone resin, modified resins of these resins, etc. Is mentioned. These resins may be used alone or in combination of two or more. In addition, the compounding amount of the resin in the elastomer composition is preferably in the range of 20 to 100 parts by mass with respect to 100 parts by mass of the elastomer component. When the amount of the resin is less than 20 parts by mass, the effect of improving the damping performance of the plug is small. On the other hand, when the amount exceeds 100 parts by mass, the processability of the elastomer composition decreases.

  In addition to the elastomer component, the reinforcing filler, and the resin, additives generally added to the elastomer composition such as an anti-aging agent, a wax, a plasticizer, and a softening agent can be added to the elastomer composition. By blending the anti-aging agent with the elastomer composition, it is possible to suppress the change in physical properties of the plug even after a long period of time. For such purposes, it is particularly effective to blend an antioxidant, an ozone deterioration inhibitor, a stabilizer, a flame retardant, and the like with the anti-aging agent.

  Examples of the plasticizer include phthalic acid, isophthalic acid, adipic acid, tetrahydrophthalic acid, sebacic acid, azelaic acid, maleic acid, fumaric acid, trimellitic acid, citric acid, itaconic acid, oleic acid, ricinoleic acid, stearic acid, Derivatives (for example, esters) such as phosphoric acid and sulfonic acid; glycols, glycerin, epoxy derivatives, and polymerization plasticizers. These plasticizers may be used alone or in a blend of two or more.

  Examples of the softener (oil) include aroma oils, naphthenic oils, paraffinic oils and the like; castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, peanut oil, rosin, Examples include vegetable oil-based softeners such as pine oil; and low molecular weight oils such as silicone oil. These softeners may be used alone or in a blend of two or more.

  The powder used for the plug composition is a material mainly responsible for the damping performance of the plug. Specifically, the vibration is damped by friction between the powders and friction between the powder and the elastomer component. Here, the powder in the present invention refers to a material other than the reinforcing filler, and includes, for example, metal powder, silicon carbide powder and the like. When the plug composition does not contain powder, the damping performance of the plug is greatly reduced, and sufficient damping performance, displacement followability, etc. cannot be obtained.

  The powder is preferably a metal powder, and the metal powder preferably has a low environmental load. For example, iron powder, stainless steel powder, zirconium powder, tungsten powder, bronze (CuSn) powder, aluminum Powder, gold powder, silver powder, tin powder, tungsten carbide powder, tantalum powder, titanium powder, copper powder, nickel powder, niobium powder, iron-nickel alloy powder, zinc powder, molybdenum powder, and the like. One species may be used alone, or two or more species may be used in combination. In addition, since these metal powders may be metal oxide powders, metal compound powders such as metal oxide powders can also be suitably used as the powder. Among these powders, iron powder is particularly preferable. Iron powder is inexpensive and has high fracture strength compared to other metal powders, and the plug for seismic isolation structures based on iron powder is neither too hard nor too brittle. Excellent damping performance can be demonstrated over a long period of time. Examples of the iron powder include reduced iron powder, electrolytic iron powder, sprayed iron powder, pure iron powder, and cast iron powder. Among these, reduced iron powder is preferable.

  In the plug composition, the content of the powder is preferably in the range of 50 to 74% by volume. When the content of the powder in the plug composition is less than 50% by volume, the distance between the powders is too wide, the friction between the powders during deformation, and the flow resistance between the powders and other components. Since it becomes small, attenuation performance is insufficient. On the other hand, when the content of the powder in the plug composition exceeds 74% by volume, the contact between the powders increases and the durability repeatedly decreases, and when the plug is molded from the plug composition, It is difficult to sufficiently remove air from the composition for use, and the volume of the plug becomes significantly larger than the ideal volume (the volume in the case where no air is mixed), so that the damping performance of the plug is lowered.

  The particle size of the powder is preferably in the range of 0.1 μm to 2 mm, and more preferably in the range of 1 μm to 150 μm. When the particle size of the powder is less than 0.1 μm, handling is difficult. On the other hand, when the particle size of the powder exceeds 2 mm, the friction between the powders tends to decrease and the damping effect tends to decrease. When the particle diameter of the powder is 1 μm or more, handling is easy, and when the particle diameter of the powder is 150 μm or less, the damping performance of the plug is sufficiently high.

  The shape of the powder is preferably indefinite. Here, the indefinite shape means that not only one type of shape such as a spherical shape but also shapes having various forms such as those having irregularities and protrusions are mixed. The shape of the powder obtained by pulverizing the bulk is naturally indeterminate, but when compared to the case of using a spherical powder, the use of the amorphous powder has a better damping effect. Obtained. This is because when an amorphous powder is used, a frictional effect occurs between the powder and between the powder and the elastomer component, and the friction is lower than when a spherical one is used. This is considered to be due to the fact that the attenuation performance is improved.

  The plug composition used in the production of the plug for a seismic isolation structure of the present invention is not particularly limited except that an elastomer composition obtained by blending a reinforcing filler into an elastomer component and powder are used. It can be manufactured as follows.

  First, in the first step, an elastomer composition is prepared by adding a reinforcing filler and various compounding agents appropriately selected as necessary to the elastomer component and kneading them.

  Next, in the second step, powder is added to the elastomer composition and further kneaded. In the second step, it is preferable to mix the powder into a plurality of times, and by mixing the powder into a plurality of times, a uniform plug composition can be produced.

  In the first and second steps for producing the plug composition, a normal kneader such as a kneader or a Banbury mixer can be used. Also, the kneading conditions are not particularly limited, and the conditions that are normally used in the technical field can be appropriately modified to set conditions that allow the composition of the present invention to be sufficiently kneaded. it can. For example, the kneading conditions in the second step are preferably in the range of 20 to 40 rpm and a temperature of about 100 ° C. In order to suppress a decrease in the viscosity of the elastomer component, it is preferable that the rotational speed is low. The temperature is preferably a temperature sufficient to soften the elastomer composition in order to improve the dispersion of the powder in the elastomer composition. However, if the temperature is too high, the elastomer component deteriorates or is cooled. It takes too much time to reduce productivity. In addition, before discharging the kneaded composition, it is preferable to release the pressure and knead without pressure. By kneading without pressure, the composition does not solidify and the composition can be taken out. It becomes easy.

<Seismic isolation structure plug>
The seismic isolation structure plug of the present invention is manufactured from the above-described plug composition, and is characterized in that, for example, at least two types of plug materials having different hardness and composition are alternately laminated at least three layers, Sufficient damping performance, displacement followability, etc. The seismic isolation structure plug of the present invention can be manufactured using the plug composition, for example, using one of the following two manufacturing methods.

First, when manufacturing plugs for seismic isolation structures by sequentially forming plug compositions having different compositions in a molding apparatus, first, a plug composition having a predetermined composition prepared as described above. The product is taken out from the kneading apparatus, put into a molding apparatus, and pressed by applying temperature and pressure to mold the plug material of the first layer with a predetermined thickness. Next, a plug composition having a composition different from that of the first layer is placed on the first layer in the molding apparatus, and press-processed in the same manner as the first layer to form the second layer plug material. It is integrally formed on one layer of plug material. Thereafter, the plug material is sequentially formed and laminated in the forming apparatus by the same method, and the plug for the seismic isolation structure is formed. In addition, as a press machine used for press work, what is normally used in the said technical field is employable. Further, the press working conditions are not particularly limited, and conditions suitable for molding of the plug can be set by appropriately modifying the conditions normally used in the technical field. For example, as the conditions for pressing, the pressing temperature is preferably in the range of room temperature to 150 ° C., and the molding pressure is preferably 0.7 t / cm ² or more.

  On the other hand, in the case of manufacturing a plug for a base isolation structure by producing plug materials formed by molding plug compositions having different compositions and laminating the formed plug materials, first, they have different compositions. The composition for plugs is taken out from the kneading apparatus, and each is pressed by a molding apparatus to obtain a plug material. Here, the apparatus and conditions used for press working can be the same as those normally used in the technical field as described above. Then, the plug materials are stacked and pressed to connect the plug materials to each other, thereby forming a plug for a seismic isolation structure. The plug material is laminated and pressed by inserting the plug material into the hollow portion of the laminated body constituting the seismic isolation structure and then covering the hollow portion into which the plug material is inserted. You may make it pressurize. In addition, the plug materials may be laminated by bonding the plug materials using a known adhesive.

<Seismic isolation structure>
The seismic isolation structure of the present invention has through holes extending in the laminating direction, in which laminating rigid plates and elastic elastic plates are alternately laminated between two flanges, and both end portions in the laminating direction are A laminate comprising an elastic plate and a plug that is press-fitted into a through-hole of the laminate and is longer than the thickness of the laminate, wherein the plug is the above-described plug for a seismic isolation structure, and has a damping performance. Displacement followability is high. Below, the example of the seismic isolation structure of this invention is demonstrated in detail, referring drawings.

  A seismic isolation structure 1 whose cross-sectional view is shown in FIG. 1 is formed by alternately laminating a rigid plate 2 having rigidity and an elastic plate 3 having elasticity in a substantially donut disk shape in the stacking direction (vertical direction). A laminated body 5 having a cylindrical hollow portion 4 that extends, a plug 6 that is press-fitted into the hollow portion 4, and a substantially donut-shaped flange that is fixed to both ends (upper and lower ends) of the laminated body 5 and the plug 6. Two flanges 9 each including a plate 7 and a disk-shaped sealing plate 8 and a covering material 10 covering the outer peripheral surface of the laminate 5 are provided.

  The rigid plate 2 and the elastic plate 3 constituting the laminated body 5 are firmly bonded by, for example, vulcanization adhesion or an adhesive. In the vulcanization adhesion, the rigid plate 2 and the unvulcanized rubber composition are laminated and then vulcanized, and the vulcanized product of the unvulcanized rubber composition becomes the elastic plate 3. Here, as the rigid plate 2, a metal plate such as a steel plate, a ceramic plate, a reinforced plastic plate such as FRP, or the like can be used. On the other hand, as the elastic plate 3, a vulcanized rubber plate or the like can be used. Moreover, the laminated body which comprises the seismic isolation structure of this invention does not need to be covered with the coating | covering material 10, but when the outer peripheral surface of the laminated body 5 is covered with the coating | covering material 10, it will be in the laminated body 5. Rain and light do not reach from the outside, and deterioration of the laminate 5 due to oxygen, ozone, and ultraviolet rays can be prevented. As the covering material 10, the same material as the elastic plate 3, for example, vulcanized rubber can be used.

  When the laminated body 5 receives a shearing force in the horizontal direction due to a displacement caused by vibration, the laminated body 5 undergoes shearing deformation and absorbs vibration energy. Moreover, since the laminated body 5 is formed by alternately laminating the rigid plates 2 and the elastic plates 3, the compression is suppressed even when a load is applied in the laminating direction (vertical direction).

  Further, the plug 6 press-fitted into the hollow portion 4 of the laminate 5 also undergoes shear deformation together with the laminate 5 when receiving a horizontal shearing force due to the displacement caused by vibration, so that the vibration energy is effective. Can be absorbed and vibration can be damped quickly. Here, since the seismic isolation structure of the present invention uses a plug in which at least three types of plug materials as described above are alternately stacked as the plug 6, sufficient damping performance, displacement followability, etc. Have.

  The composition and thickness of the plug material to be laminated can be appropriately adjusted as described above. For example, as shown in FIG. 1, the plug material 61 having the first composition and the plug material 62 having the second composition are used. (The plug material 61 has a hardness higher than that of the plug material 62), the plug material 61 having the first composition is made of two adjacent rigid plates 2 or adjacent flanges 9 and rigid plates. The plug material 62 of the second composition can be laminated between the plug materials 61 of the first composition so as to be thinner than the thickness of the elastic plate 3. In this way, the plug material that is in contact with the interface between the rigid plate 2 and the elastic plate 3 to which a relatively large shear force is applied when a horizontal displacement is applied is the plug material 61 having the first composition that does not easily collapse. At the same time, since the plug material 61 having the second composition, which is easily broken, can be connected between the plug materials 61 having the first composition, the plug material 6 is easily broken evenly as a whole, and sufficient damping performance and displacement followability can be obtained. Etc. can be demonstrated.

  The two flanges 9 are for attaching the seismic isolation structure 1 between the ground and the structure, for example, by fixing one to the ground and the other to the structure with bolts (not shown). As the flange plate 7 and the sealing plate 8, a metal plate such as a steel plate, a ceramic plate, a reinforced plastic plate such as FRP, or the like can be used.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

(Plug materials A to F)
Using a kneader, an elastomer composition having a formulation shown in Table 1 was prepared, and then the elastomer composition and iron powder were kneaded at a volume ratio shown in Table 1 to prepare a plug composition. The plug composition was pressed at a temperature of 25 ° C. and a pressure of 1.3 ton / cm ² to prepare a cylindrical plug material having a diameter of 45 mm.

* 1 Natural rubber, unvulcanized, RSS # 4
* 2 Polybutadiene rubber (low cis), unvulcanized, "Diene NF35R" manufactured by Asahi Kasei
* 3 Carbon Seed 6P, ISAF, Tokai Carbon
* 4 Resin, "Zeofine" manufactured by Nippon Zeon, "Nisseki Neopolymer 140" manufactured by Nippon Petrochemical Co., Ltd. "Marcaretz M-890A" manufactured by Maruzen Petrochemical, "Zeofine": "Nisseki Neopolymer 140": "Marcaretz M" −890A ”= 40: 40: 20 (mass ratio)
* 5 Plasticizer, Dioctyl adipate (DOA)
* 6 Other compounding agents, zinc white, stearic acid, anti-aging agent (Sumitomo Chemical "Anstage 6C", wax [Shin Nippon Oil "Proto Wax 1"], zinc white: stearic acid: anti-aging agent: wax = 4: 5: 3: 1 (mass ratio)
* 7 Iron powder 1, particle size = 40μm, irregular reduced iron powder

(Hardness measurement)
The hardness of the produced plug materials A to F was measured using a durometer D type (manufactured by Kobunshi Keiki Co., Ltd.). The results are shown in Table 1.

  From plug materials A to F in Table 1, it can be seen that the hardness of the molded plug material increases as the volume ratio of the iron powder to the elastomer composition in the plug composition increases.

(Examples 1-6)
Also, two or more types of plug materials were selected from the prepared plug materials A to F, and 100 seismic isolation structure plugs each having a thickness and order as shown in Table 2 were produced. The column “number of stacked plug materials” in Table 2 indicates the number of stacked plug materials, and the column “end plug material” indicates which plug material is the plug material constituting the upper and lower ends of the plug material. The column “central plug material” indicates a plug material constituting a portion between plug end plug materials.

(Comparative Example 1)
Furthermore, an elastomer composition having the same formulation as plug material A is prepared using a kneader, and the elastomer composition is pressed in the same manner as plug materials A to F to form a single composition (elastomer composition only). 100 seismic isolation structure plugs made of

(Comparative Example 2)
100 seismic isolation structure plugs made only of the plug material A were produced.

(Attenuation performance evaluation)
A hollow plate having a cylindrical shape in the center, an outer diameter of 225 mm, a rigid plate having rigidity (iron plate, thickness 1.2 mm) and an elastic plate having elasticity (vulcanized rubber (G ′ = 0.4 MPa), In the hollow portion of the laminate, the thickness of 2 mm] is alternately laminated between the flanges composed of the flange plate [iron plate, thickness 37 mm] and the sealing plate [iron plate, thickness 32 mm]. 6 and the plug for seismic isolation structure produced in Comparative Examples 1 and 2 were press-fitted to produce a seismic isolation structure. The rigid plate and the elastic plate were laminated by using an elastic plate as the plate adjacent to the flange and alternately laminating 22 elastic plates and 21 rigid plates. The volume of the plug was 1.01 times the volume of the hollow part of the laminate. And the damping performance was evaluated with the following method with respect to the said seismic isolation structure.

Specifically, the seismic isolation structure was subjected to a horizontal deformation in a state where a reference surface pressure was applied in the vertical direction using a dynamic testing machine to cause a shear deformation with a specified displacement. The vibration displacement was set such that the total thickness of the laminate was 100%, the strain was 50 to 250%, the vibration frequency was 0.33 Hz, and the vertical surface pressure was 10 MPa. FIG. 2 shows the relationship between the horizontal deformation displacement (δ) and the horizontal load (Q) of the seismic isolation structure. As the area ΔW of the region surrounded by the hysteresis curve in FIG. 2 becomes wider, it means that more vibration energy can be absorbed. Here, for the sake of simplicity, the damping performance of the plug was evaluated based on an intercept load Q _{d at} a strain of 200% (a horizontal load value at a displacement of 0). The intercept load Q _d is expressed by the following formula using the loads Q _d1 and Q _d2 at the point where the hysteresis curve intersects the vertical axis:
Q _d = (Q _d1 + Q _d2 ) / 2
Calculated from Further, τ _d was calculated by dividing Q _d by the cross-sectional area A of the plug. Here, these calculated values indicate that as Q _d or τ _d increases, the area of the region surrounded by the hysteresis curve increases and the attenuation performance is excellent.

The measurement using the seismic isolation structure, and the calculation of Q _d and tau _d, was performed on all plugs prepared (100 per Example). On the other hand, when a completely uniform plug is produced using the same composition as the plug material A, the theoretical value of τ _d (τ) at a strain of 150% of the seismic isolation structure using the completely uniform plug _d 150% = 85 kgf / cm ² ), the number of plugs (80% unreachable plugs) having a τ _{d of} 80% or less was counted. The results are shown in Table 2.

* 8 Each plug material C, A, C, A, C constituting the central plug material has a thickness of 12.84 mm.
* 9 The thickness of each plug material B, C, D, E, D, C, B constituting the central plug material is 9.17mm.

  From Examples 1 to 6 and Comparative Examples 1 and 2 in Table 2, a plug in which two or more types of plug materials having different compositions (hardness) are laminated is attenuated as compared with a plug having a single composition. It can be seen that it is possible to stably provide a plug with excellent performance and a uniform collapse.

  Moreover, from Example 5 of Table 2, the plug whose thickness of a hard plug material is 2 to 3 times the sum of the thickness of a rigid board and the thickness of an elastic board shows that the damping performance was more excellent. Recognize.

  Furthermore, from Examples 4 to 5, it can be seen that the plug occupying a higher proportion of the plug material having a higher hardness than the occupying proportion of the plug material having the lowest hardness exhibits better damping performance.

  From Examples 2 to 6 in Table 2, it can be seen that when the plug material at the end portion has a length equal to or longer than the length protruding from the flange, the damping performance is more excellent. Further, from the results of Examples 3 to 6, it is preferable that the plug member at the end has a length equal to or longer than the length reaching the first rigid plate beyond the elastic plate adjacent to the flange. It can be seen that the damping performance is even better.

It is sectional drawing of an example of the seismic isolation structure of this invention. It is a graph which shows the relationship between horizontal deformation displacement (delta) and horizontal direction load (Q) in the seismic isolation structure using a plug.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation structure 2 Rigid board 3 Elastic board 4 Hollow part 5 Laminated body 6 Plug 7 Flange board 8 Sealing board 9 Flange 10 Cover material 61 Plug material 62 Plug material

Claims (17)

A plug for a seismic isolation structure formed by laminating three or more layers of at least two types of plug materials having different compositions,
The plug material is a plug for a seismic isolation structure manufactured from a plug composition containing an elastomer composition obtained by blending a reinforcing filler in an elastomer component and a powder.   The seismic isolation structure plug according to claim 1, wherein the plug material has different hardness.   The seismic isolation structure plug according to claim 1, wherein the plug material is manufactured from the plug composition having a different ratio between the powder and the elastomer composition.   The seismic isolation structure plug according to claim 1, wherein the plug material is manufactured from the plug composition in which the powder has a spherical shape and an irregular shape.   The plug for seismic isolation structures according to claim 1, wherein the plug material is manufactured from the plug composition having a different content of the reinforcing filler.   The seismic isolation structure plug according to claim 3 or 4, wherein the powder is a metal powder and / or a metal compound powder.   The said powder is iron powder, The plug for seismic isolation structures of Claim 6 characterized by the above-mentioned.   The seismic isolation structure plug according to claim 1 or 5, wherein the reinforcing filler is carbon black and / or silica. A laminate in which a rigid plate having rigidity and an elastic plate having elasticity are alternately laminated, having a through-hole extending in the laminating direction and having both end portions in the laminating direction made of an elastic plate;
A plug that is press-fitted into the through-hole of the laminate, and is longer than the thickness of the laminate,
In the seismic isolation structure, which is attached to both end surfaces in the stacking direction of the stacked body and the plug, and a flange in which a part of the plug is located inside,
A seismic isolation structure, wherein the plug is the plug for a seismic isolation structure according to any one of claims 1 to 8. The plug is a plug for a seismic isolation structure according to claim 2,
The seismic isolation structure according to claim 9, wherein a total thickness of a layer made of a plug material having a high hardness in the plug is thicker than a total thickness of a layer made of a plug material having the lowest hardness. The plug is a seismic isolation structure plug according to claim 3,
In the plug, the total thickness of the layer made of the plug material manufactured from the plug composition having a high powder ratio is that of the layer made of the plug material manufactured from the plug composition having the lowest powder ratio. The seismic isolation structure according to claim 9, which is thicker than the total thickness. The plug is a plug for a seismic isolation structure according to claim 4,
The total thickness of the layer made of the plug material made of the plug composition containing the amorphous powder in the plug is made of the plug material made of the plug composition containing the spherical powder. The base-isolated structure according to claim 9, wherein the base-isolated structure is thicker than the total thickness of the layers. The plug is a plug for a seismic isolation structure according to claim 5,
The total thickness of the layer made of the plug material produced from the plug composition having a high reinforcing filler content in the plug was produced from the plug composition having the lowest reinforcing filler content. The seismic isolation structure according to claim 9, wherein the seismic isolation structure is thicker than the total thickness of the layers made of plug material. In the base isolation structure in any one of Claims 10-13,
A layer made of a plug material having a high hardness, a layer made of a plug material made of a plug composition having a high powder ratio, and a layer made of a plug material made of a plug composition containing an amorphous powder Or the thickness of the layer made of the plug material produced from the plug composition having a high content of the reinforcing filler is at least twice the sum of the thickness of the rigid plate and the thickness of the elastic plate. Structure. In the base isolation structure in any one of Claims 10-13,
A layer made of a plug material having a high hardness, a layer made of a plug material made of a plug composition having a high powder ratio, and a layer made of a plug material made of a plug composition containing an amorphous powder Or a seismic isolation structure in which a layer made of a plug material produced from a plug composition having a high reinforcing filler content is in contact with at least two adjacent rigid plates. In the base isolation structure in any one of Claims 10-15,
For plugs containing layers of plug material having a layer located at both ends of the plug, a layer made of a plug material having a high hardness, a layer made of a plug material made of a plug composition having a high powder ratio, and an amorphous powder A layer made of a plug material manufactured from the composition, or a layer made of a plug material manufactured from a composition for plugs having a high content of reinforcing filler,
The seismic isolation structure, wherein the layers at both ends have a thickness that abuts against an elastic plate adjacent to the flange.   The seismic isolation structure according to claim 16, wherein the layers at both ends have a thickness that abuts against a rigid plate closest to the flange.

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