JPH11182095A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower a friction coefficient and improve wear resistance and load resistance by impregnating the woven fabric of the polyethylene terephthalate of a specific rate with unsaturated polyester resin, in a sliding member between a foundation and a building. SOLUTION: A base isolation device is inserted between the foundation of a building and the building to prevent vibration of an earthquake. The base isolation device slides a sliding plate stuck on a bearing 1 and a metal plate 4 attached to a column 5, and a moving range is regulated by a horizontal spring 2. A sliding plate 3 composition impregnating the woven fabric of polyethylene terephthalate with unsaturated polyester resin is used. The amount of the polyethylene terephthalate woven fabric in the sliding plate composition may be 15-60 vol.%. Thereby strength and wear resistance are enhanced to make low friction and compression characteristics are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device which acts on a structure such as a building or a tower to reduce a horizontal force caused by an earthquake.

[0002]

BACKGROUND OF THE INVENTION Seismic isolation is the reduction in some way of shaking caused by an earthquake applied to a building. Currently,
The mainstream of seismic isolation methods is to install a device between the foundation of the building and the building to prevent the vibration of the earthquake from exerting on the building.

[0003] Devices used in the above seismic isolation method (hereinafter referred to as
It is called "seismic isolation device". As an example of ()), using the seismic isolation device shown in FIG.
And the base footing of the slide bearing 1 is made of ethylene tetrafluoride resin (hereinafter referred to as “PT
FE ". 2), a sliding plate 3 made of a composite material is attached, and the sliding plate 3 and the metal plate 4 attached to the end surface of the pillar 5 on the side of the sliding plate 3 are slid. In other words, the building slides against the horizontal movement of the ground due to the earthquake, so that a force greater than the frictional force acting on the slip surface is not applied to the building, and the building is moved by the horizontal spring 2 so that the building does not move significantly. The range is regulated. Therefore, the smaller the coefficient of friction between the slide plate 3 and the metal plate 4 is, the greater the seismic isolation effect is, and a stable friction coefficient is required to surely exhibit the seismic isolation effect.

[0004]

However, in general, PTFs are generally used.
Although the coefficient of friction of E is said to be small, it is generally used as a composite material in which a filler such as glass fiber is blended, because of its poor wear resistance and compression characteristics. Conventionally, such P
Good seismic isolation has been achieved by using TFE composite material for the sliding surface.However, when designing seismic isolation devices that can withstand larger earthquakes and respond to the enlargement of buildings to which they are applied, In some cases, conventional materials such as a PTFE composite material are not sufficient. That is, when assuming a larger earthquake, it is necessary to consider an increase in slip speed. In sliding friction, the coefficient of friction tends to increase as the sliding speed increases. Therefore,
In order to exhibit an excellent seismic isolation effect even in a large earthquake, it is necessary to reduce the friction coefficient of the sliding surface and to reduce the speed dependence of the friction coefficient.

On the other hand, an increase in the size of a building causes an increase in surface pressure. Originally, PTFE is a flexible resin, and even if the creep resistance is improved with a filler, there is a limit to the load carrying capacity. Therefore, under a large load, the amount of compressive deformation increases with the passage of time, resulting in an increase in the contact area on the sliding surface and an increase in the coefficient of friction. Also, an increase in the sliding speed and the surface pressure leads to an increase in wear.

Accordingly, an object of the present invention is to improve the performance of a seismic isolation device by lowering the coefficient of friction of the material constituting the sliding surface, improving the wear resistance, and further improving the load resistance. It is in.

[0007]

In order to solve the above-mentioned problems, the invention according to this seismic isolation device is characterized in that at least one of the sliding surfaces which generates a slip when an earthquake occurs, contains 15 to 60% by volume of an unsaturated polyester resin. Using a sliding member composition obtained by impregnating a woven fabric of polyethylene terephthalate.

Since the above-mentioned sliding member composition is used as the sliding plate of the seismic isolation device, the strength of the sliding member is increased, the wear resistance is enhanced, the friction is reduced, and the deformation is small.
For this reason, it exhibits an excellent seismic isolation effect even under high surface pressure.

[0009]

Embodiments of the present invention will be described below. The seismic isolation device according to the present invention is a device used in a "base insulation type" seismic isolation method for preventing earthquake vibration from being exerted on a building by being inserted between a building foundation and the building. In this seismic isolation device, a sliding member composition obtained by impregnating a woven fabric of polyethylene terephthalate with an unsaturated polyester resin is used for at least one of the sliding surfaces where slippage occurs when an earthquake occurs.

[0010] As an example of this seismic isolation device, as shown in FIG. 1, the device is a combination of a slide bearing 1 and a horizontal spring 2, and a slide plate 3 is attached to a basic footing of the slide bearing 1. A device for sliding the sliding plate 3 and the metal plate 4 attached to the end surface of the pillar 5 on the sliding plate 3 side is exemplified. In other words, the building slides against the horizontal movement of the ground due to the earthquake, so that a force greater than the frictional force acting on the slip surface is not applied to the building, and the building is moved by the horizontal spring 2 so that the position of the building does not largely move. The range is regulated. In the case of this seismic isolation device, a sliding member composition in which the above-mentioned unsaturated polyester resin is impregnated in the above-mentioned sliding plate 3 into a woven polyethylene terephthalate fabric is used. By combining an unsaturated polyester resin and a polyethylene terephthalate woven fabric, it is possible to obtain a resin having enhanced strength and abrasion resistance, reduced friction, and excellent compression characteristics.

The unsaturated polyester resin is not particularly limited, and may be an unsaturated alkyd obtained by condensation-esterifying a polybasic acid having an unsaturated group and a polybasic acid having a saturated group with a polyhydric alcohol. A low-viscosity reactive diluent having a double bond such as styrene and a polymerization inhibitor such as hydroquinone or t-butylcatechol, or a vinyl ester obtained by reacting acrylic acid or methacrylic acid with an epoxy resin. As long as it is a resin or the like that can be cured at room temperature or can be cured only at a high temperature, it can be widely used.

Examples of the above polybasic acids having an unsaturated group include maleic anhydride and fumaric acid. Examples of the polybasic acids having a saturated group include adipic acid, phthalic anhydride and Isophthalic acid, tetrachlorophthalic anhydride and the like can be mentioned. Examples of the polyhydric alcohol include ethylene glycol, propylene glycol, 1,3-butanediol, diethylene glycol,
Examples include dipropylene glycol, neopentyl glycol, and bisphenol A propylene oxide adduct.

Examples of the epoxy resin include a bisphenol A type epoxy resin and a novolak type epoxy resin.

The low-viscosity reactive diluent having a double bond is not particularly limited. In addition to the most typical styrene, diallyl phthalate and vinyl toluene which are often used in heat-curable resins, Divinylbenzene, vinyl acetate methacrylate, diethylene glycol bisallyl carbonate, 2,5-dichlorostyrene,
Diallyl ether, triallyl cyanurate, 4-vinylcyclohexane monoepoxide, glycidyl methacrylate, divinyl ether, vinylpyrrolidone, 2-methyl-5-vinylpyridine, triallyl phosphate,
Diallylbenzene phosphonate and the like can be used.

The polymerization initiator and the curing accelerator used for curing the unsaturated polyester resin are not particularly limited, and generally used methyl ethyl ketone peroxide, perester, cobalt naphthenate, tertiary amine and the like are used. Can be given.

When a vinyl ester resin having high toughness and excellent adhesiveness with an additive is used among the unsaturated polyester resins, when PTFE or the like is used as an additive,
It is more preferable because of less decrease in strength and excellent in abrasion resistance and weather resistance.

Examples of the vinyl ester resin include those prepared by dissolving diacrylate or methacrylate obtained by reacting acrylic acid or methacrylic acid with a bisphenol A type epoxy resin in a monomer such as styrene. it can. The polymerization initiator and the curing accelerator used when producing the vinyl ester resin are not particularly limited, and the same as the above-mentioned unsaturated polyester can be used.

The polyethylene terephthalate woven fabric can be widely used as long as it is a yarn made of polyethylene terephthalate obtained by polycondensation of a salt such as an ester or chloride of terephthalic acid with ethylene glycol. . The form of the yarn may be a filament yarn or a spun yarn. Further, the fabric structure of the woven fabric is not particularly limited, plain weave, twill weave,
A single organization such as Ashiori's Mihara organization, change organization, special organization,
Layered weaving structure such as single double structure, double structure, multiple structure, hair pile structure such as vertical pile weaving and horizontal pile weaving, leno structure,
It can be widely used such as a textured structure and a three-dimensional structure.

The amount of the polyethylene terephthalate woven fabric contained in the sliding member composition is preferably 15 to 60% by volume, and more preferably 20 to 50% by volume. If it is less than 15% by volume, the reinforcing effect of the polyethylene terephthalate woven fabric is not sufficient, and if it exceeds 60% by volume, the moldability is significantly impaired, and a satisfactory molded product may not be obtained.

When the fiber constituting the above-mentioned polyethylene terephthalate woven fabric is made of a spun yarn of polyethylene terephthalate, the production method is not particularly limited, and polyethylene terephthalate is melt-spun, cut short, and spun. If it can be widely used,
The number, number of twists or density is not limited.

Further, when the fibers constituting the polyethylene terephthalate woven fabric are made of polyethylene terephthalate filament yarn, the production method is not particularly limited, and the polyethylene terephthalate is melt-spun and this is not twisted. A monofilament yarn used alone or a multifilament twisted with an appropriate number can be widely used, and the number, twist number and density are not limited.

Further, the above-mentioned unsaturated polyester resin may be impregnated with a woven fabric of polyethylene terephthalate in a resin composition obtained by adding tetrafluoroethylene resin (PTFE).

The PTFE may be a molding powder or a fine powder for solid lubrication. Commercial products of such PTFE include Teflon 7J, TLP-10, manufactured by DuPont-Mitsui Fluorochemicals; Fluon G163, manufactured by Asahi Glass Co., Ltd .;
TL350, KT400H, KT300M, manufactured by Hoechst: Hostaflon TF9205, TFX9207, and the like. Further, the above PTFE may be modified with an alkyl vinyl ether.

When the PTFE is mixed with the unsaturated polyester resin at the time of molding, it is more preferably a fine powder for solid lubrication, which has a small weight average molecular weight and is hard to fibrillate, since it is difficult to form voids. . In addition, the average particle size is preferably 1 to 50 μm, and more preferably 1 to 30 μm, in order to uniformly disperse and make it difficult to generate voids.
Is more preferred.

The amount of the PTFE added to the sliding member composition is preferably 3 to 15% by volume, and 4 to 1% by volume.
2% by volume is more preferred. If the amount is less than 3% by volume, no improvement in the sliding properties is observed. If the amount exceeds 15% by volume, the viscosity of the resin increases during molding and voids may be formed.

The above unsaturated polyester resin is added to the above PTF
When E is added, good sliding characteristics are exhibited even if any one kind of a spun yarn or a filament yarn is used as the woven fabric of the polyethylene terephthalate, and the above two kinds of yarns are woven. That is, the sliding member formed from the obtained sliding member composition has a lower coefficient of friction and hardly damages the mating material even without lubrication, thereby increasing the wear resistance.
At this time, in order to further improve the abrasion resistance, it is more preferable to use a woven fabric composed only of spun yarn.

On the other hand, when the above-mentioned PTFE is not added to the above-mentioned unsaturated polyester resin, a good sliding property is exhibited when a spun yarn is used as the above-mentioned polyethylene terephthalate woven fabric.

A preferred sliding member composition is obtained by impregnating a woven polyethylene terephthalate fabric using spun yarn or filament yarn with a vinyl ester resin as an unsaturated polyester resin. Among them, as a material exhibiting more preferable sliding characteristics, a material obtained by impregnating a vinyl terephthalate woven fabric using a spun yarn with a vinyl ester resin is exemplified.

In addition to the above, a solid lubricant for improving the sliding characteristics may be added to the unsaturated polyester resin. Examples of such a solid lubricant include graphite, molybdenum disulfide, and the like.

When the woven polyethylene terephthalate fabric is impregnated with the unsaturated polyester resin and PTFE, the unsaturated polyester resin and PTFE are impregnated before the impregnation.
Is preferably mixed. The mixing method is not particularly limited, and may be any method as long as it is uniformly dispersed. Specific examples include a kneader kneader, a Banbury mixer kneader, and an intermix kneader.

The method of impregnating the above-mentioned polyethylene terephthalate woven fabric with a resin such as the above-mentioned unsaturated polyester resin and molding it is not particularly limited.
An RP manufacturing method can be employed. When impregnating the woven fabric with the resin, the woven fabric and the resin may be alternately laminated and compressed, or the woven fabric may be impregnated with the resin in advance to form a prepreg and then laminated. At this time, it is preferable that the layers are laminated while removing air by applying a roller or the like. When laminating the woven fabric, the lamination may be performed with the orientation of the yarns aligned, may be laminated at regular angles, or may be irregularly laminated. When using a thermosetting resin as described above as this resin, it is common to perform post-curing heat treatment after molding in order to completely cure the poorly cured portion.
What is necessary is just to carry out at 80-90 degreeC for 2 hours.

As a specific method, for example, a hand lay-up method, a press molding method, a cold press method, an SMC
Method, transfer molding method, resin transfer molding method, filament winding method, pultrusion method and the like.

The hand lay-up method is a method of defoaming and laminating a woven fabric while impregnating the resin with a brush or a roll, and laminating the woven fabric impregnated with the resin, and using a brush or roller. For example, a method of defoaming along the mold while defoaming may be used.

The filament winding method is a continuous molding method using a continuous fiber or woven fabric. The woven fabric impregnated with a resin is continuously wound around a mandrel according to a predetermined pattern to form a laminated structure. Is also good. At that time, the wet winding method of performing the winding while impregnating the continuous bundle of woven fabric with the liquid resin on the apparatus, impregnating the continuous bundle of liquid fabric with the liquid resin in a separate process,
Any of the prepreg winding systems in which winding is performed using a prepreg tape adjusted to a semi-cured state can be adopted. Also, when wrapping around the mandrel, the rotation of the mandrel and the woven fabric supply unit perform relative motion,
There are two types of helical winding and polar winding, and both types can be adopted.

Alternatively, a woven fabric previously woven into a three-dimensional shape may be used as a woven fabric and impregnated with a resin.
At this time, if the vacuum impregnation is performed with a vacuum pump or the like, generation of voids can be prevented.

Further, the form in which the sliding member composition of the present invention is used is not particularly limited, and a flat sliding plate as shown in FIG. 1 is processed into a predetermined shape and used alone. can do. Also, if you need more strength depending on the application, metal, monomer cast nylon,
A material such as FRP or wood reinforced with glass fiber or the like may be processed into a predetermined shape to form a backing metal, which may be used by bonding to the backing metal.

Further, when incorporating the sliding member composition of the present invention into a seismic isolation device, a metal plate or a rubber sheet may be bonded to a backing metal, or a combination of these may be used for lamination. Further, in order to further reduce friction, it is possible to apply a coating of a fluoropolymer or an organopolysiloxane to the surface of the sliding partner metal plate. Further, for the purpose of promoting the discharge of wear powder and preventing the accumulation of frictional heat, as shown in FIGS. 2 (a) to 2 (g), grooves 6 of various designs are formed on the sliding surface of the sliding plate 3. Processing is also possible.

The shape of the seismic isolation device using the above sliding member composition for the sliding portion is not limited, and an appropriate form suitable for the peripheral device and the housing can be adopted. In addition, the above-mentioned sliding member composition enhances the strength and abrasion resistance of the used polyethylene terephthalate woven fabric, and further reduces the friction by adding a predetermined amount of PTFE. And a sliding member composition having extremely excellent wear resistance. In addition, because the reinforced unsaturated polyester resin has excellent compression properties,
Even under a high surface pressure, the amount of deformation is significantly smaller than that of the conventional PTFE composite material.

[0039]

Embodiments of the present invention will be described below. First, raw materials used in Examples and Comparative Examples are collectively shown below. The abbreviations are shown in [].

Unsaturated polyester resin (1) Unsaturated polyester resin [UP] Ester G13 manufactured by Mitsui Toatsu Chemicals, Inc. (2) Vinyl ester resin [VE] Ester H8100 manufactured by Mitsui Toatsu Chemicals.

・ Woven cloth (3) Polyethylene terephthalate spun yarn woven cloth [PET
A] Polyethylene terephthalate woven fabric, structure: plain weave Constituent yarn: spun yarn, cotton count: warp 30/2, weft 20/2 density (warp × weft): 52 (books / inch) × 40 (books / in)
ch) (4) Polyethylene terephthalate filament woven fabric [PET B] Polyethylene terephthalate woven fabric, structure: plain woven Constituent yarn: filament yarn, denier count: warp yarn 250 /
48, weft 250/48 density (warp x weft): 60 (books / inch) x 40 (books / in)
ch) (5) Aramid spun yarn woven fabric (aramid woven fabric) Teijin: CO1200 (6) Glass woven fabric (glass woven fabric) Asahi Fiberglass: HS180.

Additive (7) Ethylene tetrafluoride resin for solid lubrication [PTFE] Hoechst: Hostaflon TF9205 Average particle size: 5 μm (8) Graphite: Graphite: LONZA: KS-6 (9) Glass fiber 20 Volume% containing PTFE composite [P
TFE composite material] Glass fiber (MF06, MB120, manufactured by Asahi Fiberglass Co., Ltd.) is added to PTFE for compression molding (Teflon 7J, manufactured by DuPont Fluorochemicals, Inc.).
% By volume and compression-molded at a surface pressure of 45 MPa.
It was obtained by firing at 70 ° C.

[Examples 1 to 4] Of the raw materials shown in Table 1, raw materials except for woven fabric were mixed at the ratio shown in Table 1, mixed thoroughly with a mixer, and then mixed by a hand lay-up method. Impregnated and laminated on the woven fabric, the hardened laminate is cut by 3
A plate test piece of 0 × 30 × 3 mm was obtained. This plate-shaped test piece was adhered to a 30 × 30 × 10 mm S45C block made of epoxy resin to obtain a friction and wear test piece.

Using this test piece, a friction and wear test was carried out by a reciprocating tester under the following conditions. As a result, the obtained friction coefficient and specific wear amount are shown in Table 2.

Also, 12.7 × 12.7 × 12.7 mm
Was molded and processed, and the compression creep deformation after 24 hours under 13.7 MPa was measured in accordance with ASTM D621. Table 2 shows the results.

A reciprocating motion test was carried out by using a buff-finished SUS304 plate as a mating member and reciprocating a stroke of ± 35 mm while pressing a friction and wear test piece against the SUS plate at a surface pressure of 17.6 MPa. The sliding speed was gradually increased to 3, 50, 250, and 430 mm / s, and the friction coefficient at each speed was measured. The number of times of sliding was 40 cycles.

The specific wear (mm 3 / N / m) was calculated from the weight difference between before and after the test.

[Comparative Examples 1 to 3] Test pieces were prepared and subjected to a reciprocating motion test in exactly the same manner as in Example 1 except that the raw materials were blended in the proportions shown in Table 1. Was measured. Further, the compression creep deformation rate was measured according to the above method. In Comparative Example 3, PT
Using the FE composite material as a test piece, a reciprocating motion test and a measurement of a compression creep deformation rate were performed according to the above-described methods.
Table 2 shows the results.

[0049]

[Table 1]

[0050]

[Table 2]

[0051] Results As apparent from the results shown in Table 2, Comparative Examples 1 and 2, a high coefficient of friction, also specific wear rate is large. Further, in Comparative Example 3, although the coefficient of friction was low, the coefficient of friction tended to increase as the speed increased. Furthermore, not only the wear was large, but also the compression creep deformation showed a large value.

On the other hand, the test pieces of Examples 1 to 4 had a small coefficient of friction and hardly any speed dependency. Also,
The specific wear amount and the compressive creep deformation amount were small, which were favorable characteristics.

[0053]

According to the present invention, the seismic isolation device of the present invention exhibits high surface pressure, high speed, and stable low friction, so that it is effective as a high-performance seismic isolation device even in a large building even in a large building. Can be absorbed. Also, since the compression deformation is small, it does not deform over time, and the reliability is high.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing an example of a seismic isolation device according to the present invention.

2A is a plan view showing another example of the slide plate shown in FIG. 1; FIG. 2B is a cross-sectional view taken along line AA of FIG. 1A; FIG. Plan view showing an example of

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding bearing 2 Horizontal spring 3 Sliding plate 4 Metal plate 5 Pillar 6 Groove

Claims (8)

[Claims] An unsaturated polyester resin is applied to at least one of the sliding surfaces which generate slip when an earthquake occurs.
A seismic isolation device using a sliding member composition obtained by impregnating a woven fabric of polyethylene terephthalate having a capacity of% by volume. 2. The seismic isolation device according to claim 1, wherein the unsaturated polyester resin is a vinyl ester resin. 3. The seismic isolation device according to claim 1, wherein a resin composition obtained by adding a tetrafluoroethylene resin to an unsaturated polyester resin is impregnated into 15 to 60% by volume of a woven fabric of polyethylene terephthalate. . 4. The seismic isolation device according to claim 3, wherein the polyethylene terephthalate woven fabric is a woven fabric made of a spun yarn of polyethylene terephthalate. 5. The seismic isolation device according to claim 3, wherein the polyethylene terephthalate woven fabric is a woven fabric made of polyethylene terephthalate filament yarn. 6. The amount of the ethylene tetrafluoride resin added is 3
The seismic isolation device according to any one of claims 3 to 5, wherein the content is up to 15% by volume. 7. The seismic isolation device according to claim 3, wherein the ethylene tetrafluoride resin is a powder for solid lubrication. 8. The seismic isolation device according to claim 3, wherein the average particle size of the tetrafluoroethylene resin powder is 1 to 50 μm.