JP2006266406A - Sliding member of earthquake isolating slide bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding member of an earthquake isolating slide bearing device, which sliding member has a very low frictional coefficient and a high compression strength that hardly decreases even when lubricant has been retained therein. <P>SOLUTION: The sliding member 11 of the earthquake isolating slide bearing device comprises a plurality of laminated elements 12, 13 composed of composite elements made of aramid fiber and fluororesin, and a heat resistive mesh shape reinforcing material 14 arranged between the laminated elements 12, 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sliding member for a low-friction seismic isolation sliding bearing device attached to the lower side of a large building such as a building or a bridge.

  Conventionally, a sliding member for a seismic isolation sliding bearing device (hereinafter referred to as a sliding member) has been widely used for buildings such as buildings and bridges, large structures in various industrial plants, and the like. For example, as shown in FIG. 5, the sliding member 1 is disposed so that the upper sliding member holding plate 5 and the counterpart member 6 are opposed to each other between an upper structure 3 such as a building and a lower structure 4 that is a base portion. Installed and used.

  The function of the sliding member 1 is as follows. That is, when an earthquake occurs, a horizontal load is applied to the lower structure 4. This horizontal load is reduced by the sliding action of the sliding member 1 between the upper sliding member holding plate 5 and the mating member 6 arranged opposite to each other, and is transmitted to the upper structure 3. At this time, the horizontal load transmitted to the upper structure 3 is a value obtained by multiplying the load by the upper structure 3 by the friction coefficient of the sliding member 1 of the seismic isolation sliding support device. Therefore, it is desirable that the friction coefficient of the sliding member is as low as possible. The sliding member 1 is also required to have a high compressive strength in order to support a large building. For the reasons described above, conventionally, as the sliding member, a fluorine-based material such as a tetrafluoroethylene resin having a low coefficient of friction and a value of 0.07 to 0.15 has been used.

However, in recent years, a sliding member that satisfies the following requirements 1) to 3) has been demanded from the viewpoint of increasing the degree of freedom of building and seismic isolation device design and improving the reliability during a large earthquake.
1) It has a friction coefficient of about 0.02 that is lower than the friction coefficient level of the tetrafluoroethylene resin as a friction coefficient for the sliding member for the seismic isolation device.
2) The coefficient of friction can be stably maintained over a long period of time.
3) Have sufficient compressive strength to support large buildings.

Conventionally, in order to realize a friction coefficient of about 0.02, a lubricant is held in a molded article having a porous structure mainly composed of tetrafluoroethylene resin. For example, the main component is tetrafluoroethylene resin. A porous structure molded body having a plurality of voids composed of a composition containing an aromatic polyester or a sliding member holding a lubricant on the surface layer portion of a composite having the molded body on the substrate surface It has been proposed (Patent Document 1).
JP 2001-82543 A

  However, to achieve a very low level of friction coefficient and maintain it over a long period of time in a conventional sliding member that holds a lubricant in a porous structure formed mainly of tetrafluoroethylene resin. In addition, the compression strength of a molded article having a porous structure mainly composed of tetrafluoroethylene resin, in particular, the compression strength of the molded article itself is large, and the compression strength is lowered when a lubricant is held. Less is required.

  The present invention has been made in view of the above circumstances, has a very low level of friction coefficient that satisfies this condition, has a high compressive strength, and has a small decrease in compressive strength when a lubricant is held. An object is to provide a sliding member for a sliding support device.

The present invention is characterized by comprising a plurality of laminates formed by laminating a plurality of composites composed of aramid fibers and fluororesin, and a heat-resistant mesh-like reinforcing material provided in the middle of these laminates. This is a sliding member for a seismic isolation sliding bearing device.
The laminate preferably contains a lubricant such as silicone oil, fluorine oil, oleic acid, oleic acid ester, or oleyl alcohol. Among these lubricants, silicone oil is particularly preferable because it is excellent in weather resistance, oxidation resistance, and pressure resistance.

  According to the sliding member of the present invention, an extremely low level of friction coefficient can be realized and maintained for a long period of time. In addition, the compressive strength is small when the lubricant is held with a high compressive strength, and sufficient compressive strength to support a large building can be obtained.

Hereinafter, the present invention will be described in more detail.
FIG. 1 shows an example of a sliding member 11 for a seismic isolation sliding support device according to the present invention. Reference numerals 12 and 13 in the figure indicate a laminate formed by laminating a plurality of composites containing aramid fibers and fluororesin, which are porous materials having high compressive strength and fine pores. A plurality of heat-resistant mesh-like reinforcing materials 14 are sandwiched between the laminated bodies 12 and 13, respectively. A lubricant is contained in the micropores of the composite.

By adopting such a configuration, (1) the compression strength is large due to the inherent properties of the laminate composed of the composite, and (2) since a lubricant is contained in the laminate, an extremely low coefficient of friction can be realized, (3) Moreover, the horizontal rigidity of the laminate is increased in the heat-resistant mesh-like reinforcing material, and deformation can be suppressed. As a result, even if a lubricant is contained in the laminate, it is possible to obtain a sliding member for a base-isolation sliding bearing device that has little reduction in compressive strength and is excellent in creep resistance.
Moreover, since it is excellent in creep resistance, the contained lubricant is not squeezed out, and the ability to retain the lubricant can be maintained, so that a low coefficient of friction can be maintained for a long time.

  As a composite used in the present invention, aramid fibers are added to a fluororesin resin aqueous dispersion and sufficiently stirred and dispersed, and then a flocculant is added to destabilize the fluororesin and deposit it on aramid fibers. A composite in which aramid fibers on which a fluororesin is deposited is made and dried to form a sheet is used. Here, the composite having a thickness of 0.3 mm and PTFE resin / aramid fiber = 55/45 (mass%) is commercially available and can be used in the present invention.

  In addition, since the product of the present invention includes a fluororesin, the mesh-like reinforcing material is required to have heat resistance that can withstand the processing temperature of the fluororesin. As the reinforcing material, for example, various metal fabrics such as heat resistant stainless steel fabric, aramid fiber cloth, glass fiber cloth, and carbon fiber cloth can be used. The mesh size of the reinforcing material is preferably in the range of 30 to 80 mesh, for example, in the case of a stainless steel mesh reinforcing material. Here, if the mesh is smaller than 30 mesh, the laminate sufficiently digs into the mesh reinforcement, but the proportion of the reinforcement in the laminate becomes small, and the role as a reinforcement that suppresses deformation cannot be achieved. It becomes easy to deform. On the other hand, if it is larger than 80 mesh, the laminate does not penetrate into the mesh reinforcing material, and sufficient compressive strength cannot be obtained, and the compressive strength when a lubricant is contained in the laminate is greatly reduced. .

  In addition, as the lubricant used in the present invention, any lubricant that has fluidity and permeability and is liquid at the time of sliding can be used. Examples include silicone oils that are excellent in weather resistance. Here, “silicone oil” refers to liquid or wax-like polysiloxane. Liquid polysiloxanes include relatively low molecular weight polysiloxanes, and specific examples include dimethylposiloxane, methylhydrogen polysiloxane, and methylmethoxypolysiloxane.

  Examples of the wax-like polysiloxane include polysiloxane having a slightly higher molecular weight than the above-described liquid polysiloxane, and specific examples thereof include dimethylpolysiloxane, methylphenylpolysiloxane, long chain alkyl-modified silicone, and trifluoropropylmethylpolysiloxane. Examples include siloxane. The polysiloxanes can be used alone or in combination of two or more.

  The content of the lubricant is 0.5 to 20% by mass, more preferably 1 to 10% by mass, based on the total mass of the composite laminate and the lubricant composed of aramid fibers and fluororesin. When the lubricant is less than 0.5% by mass, the effect of reducing the friction coefficient is not recognized, and when it exceeds 20% by mass, the wear resistance of the product of the present invention is reduced.

  Next, the manufacturing method of the product of the present invention will be described with reference to FIGS. For example, a composite having a thickness of 0.3 mm is used as the composite of the upper and lower laminates 12 of the sliding member 11 shown in FIG. Further, when the mesh size of the mesh-like reinforcing material 14 is 30 to 80 mesh, in order to eliminate the influence of irregularities on the surface of the mesh-like reinforcing material 14 and smooth the surface state of the product of the present invention, The number of laminated bodies is not limited, but is preferably 3 or more. In addition, when the mesh-like reinforcing material 14 has a structure of two or more layers, the number of laminated layers 13 composite used between the mesh-like reinforcing materials 14 is not limited, but may be two or more layers. preferable. When the composite body has a single layer, when the sliding member of the present invention is cut into a predetermined size at the time of use, the mesh-like reinforcing material 14 has poor cutting properties, causing problems such as the fibers of the reinforcing material popping out.

  In consideration of the above, a laminate 12 made of a composite containing a desired size and number of aramid fibers and a fluororesin, and a mesh-like reinforcing material, which are necessary for manufacturing a sliding member having a desired configuration Cut 14 and prepare. Next, as shown in FIG. 2, the cut material, that is, the laminated body 12 composed of a plurality of composite bodies 21, the laminated body 13 composed of a plurality of composite bodies 22, and a mesh-like reinforcing material 24 are stacked according to a desired configuration. The assembly is placed between the hot press surfaces, and the assembly is integrated by, for example, heating and compressing for 60 minutes under the conditions of a pressure of 2 MPa and a temperature of 400 ° C., and then the heater of the hot press is turned off. While maintaining this pressure, a sliding member having a desired configuration and a desired size can be obtained by cooling for 60 minutes and removing from the press. The composites 21 and 22 both contain aramid fibers and a fluororesin.

  Furthermore, a lubricant is contained in the obtained sliding member by the following operation. That is, in order to contain an appropriate amount of lubricant in the sliding member, the lubricant having a predetermined concentration is put in a prepared container, and the sliding member is immersed in the container for a predetermined time and then taken out. By the above operation, a composite multilayer structure in which at least one heat-resistant mesh-like reinforcing material is sandwiched between the laminate layers composed of the composite containing the aramid fiber containing the lubricant of the present invention and a fluororesin as components. A sliding member is obtained.

Next, the present invention will be described in detail in the following examples.
Example 1
First, 12 composites (trade name: Twaron TPL sheet, manufactured by Teijin Techno Products Co., Ltd.) and 40 meshes (wire diameter) having an aramid fiber having a thickness of 0.3 mm, a width of 300 mm, and a length of 300 mm and a fluororesin as components. 0.14 mm), a width of 300 mm, and a length of 300 m of four stainless steel mesh reinforcements are prepared for cutting and are stacked in the order shown in FIG. Next, these cut and stacked materials are placed between the hot press surfaces and integrated by heating and compressing for 60 minutes under conditions of a pressure of 2 MPa and a temperature of 400 ° C. Subsequently, the heater of the hot press was turned off, the material was cooled for 60 minutes while maintaining a pressure of 2 MPa, and then taken out from the press to produce a material having a thickness of 3 mm, a width of 300 mm, and a length of 300 mm. In FIG. 3, reference numerals 31 and 32 indicate composites, and reference numeral 34 indicates a stainless steel mesh reinforcing material.

(Example 2)
The same material as in Example 1 was prepared, and the material was immersed in silicone oil (trade name: TSF-410, manufactured by GE Toshiba Silicone Co., Ltd.) for 336 hours, and a material containing 9.0% by mass of silicone oil was prepared. Produced.

(Example 3)
First, eleven composites (trade name: Twaron TPL sheet, manufactured by Teijin Techno Products Co., Ltd.) containing aramid fibers having a thickness of 0.3 mm, a width of 300 mm, and a length of 300 mm and a fluororesin, and a fluororesin-coated mesh aramid Two pieces of fiber cloth (trade name: FAF410-32, manufactured by Chukoh Kasei Kogyo Co., Ltd.) are prepared for cutting and superposed in the order shown in FIG. Next, these cut and stacked materials are placed between the hot press surfaces and integrated by heating and compressing for 60 minutes under conditions of a pressure of 2 MPa and a temperature of 400 ° C. Subsequently, the heater of the hot press was turned off, the material was cooled for 60 minutes while maintaining a pressure of 2 MPa, and then taken out from the press to produce a material having a thickness of 3 mm, a width of 300 mm, and a length of 300 mm. In FIG. 4, reference numerals 41 and 42 indicate composites, and reference numeral 44 indicates a fluororesin-coated mesh aramid fiber cloth (reinforcing material).

Example 4
The same material as that of Example 3 was prepared, and the material was immersed in silicone oil (trade name: TSF-410, manufactured by GE Toshiba Silicone Co., Ltd.) for 336 hours to prepare a material containing 8.3% by mass of silicone oil. Produced.

(Comparative Example 1)
First, 21 composites (trade name: Twaron TPL sheet, manufactured by Teijin Techno Products) having a thickness of 0.3 mm, a width of 300 mm, and a length of 300 mm as components are prepared and stacked. Then, it integrates by heat-pressing between the hot press board surfaces at a pressure of 2 MPa and a temperature of 400 ° C. for 60 minutes. Next, the heater of the hot press was turned off, and after cooling for 60 minutes while maintaining a pressure of 2 MPa, the material was taken out from the press to produce a material having a thickness of 3 mm, a width of 300 mm, and a length of 300 mm.

(Comparative Example 2)
The same material as Comparative Example 1 was produced, and the material was immersed in silicone oil (trade name: TSF-410, manufactured by GE Toshiba Silicone Co., Ltd.) for 336 hours to contain a material containing 8.2% by mass of silicone oil. Produced.

(Comparative Example 3)
A PTFE resin sheet containing a filler (5% by mass of molybdenum disulfide and 15% by mass of glass fiber) having a thickness of 3 mm, a width of 300 mm, and a length of 300 mm was produced.
Regarding the produced materials of Examples 1 to 4 and Comparative Examples 1 to 3, hardness, compressive strength, and friction coefficient were measured. The results are shown in Table 1 below.

In Table 1,
* 1: Durometer Shore D hardness (Testing machine: HD-1104N type manufactured by Ueshima Seimitsu Seisakusho Co., Ltd.)
* 2: Measured according to ASTM D695. (Testing machine: Autograph AG-100kNG type from Shimadzu Corporation,
(Specimen size: thickness 3 mm x diameter 20 mm, test speed: 1.3 mm / min, pressure direction: thickness direction)
Example 1 and Example 2 are materials using the stainless steel mesh reinforcing material according to the present invention, and those containing no silicone oil. Examples 3 and 4 are materials using the fluororesin-coated mesh-like aramid fiber reinforcing material according to the present invention, which contain and do not contain silicone oil, respectively. Comparative Example 1 and Comparative Example 2 are materials having a structure in which a composite containing an aramid fiber and a fluororesin according to the prior art is laminated, each containing no silicone oil. Comparative Example 3 is a filled PTFE resin sheet that has been used in conventional seismic isolation sliding bearing devices.

  Among the above tests, Examples 1 and 2, Examples 3 and 4, and the difference in the measurement results of the compressive strength of Comparative Examples 1 and 2 mean that the strength is reduced by containing silicone oil. In the test results, in Examples 1 and 2, Examples 3 and 4, and Comparative Examples 1 and 2, the strength reduction rates were 19.6%, 30.9%, and 48.4%, respectively. In Examples 1 and 2 and Examples 3 and 4, it was demonstrated that the rate of decrease in compressive strength due to the inclusion of silicone oil was smaller than in Comparative Examples 1 and 2 according to the prior art. .

  In addition, the compressive strength itself of the first, second, and third examples is higher than that of the first and third comparative examples, particularly in the case of the first example and the second example containing the silicone oil. Lamination of a composite composed of an aramid fiber and a fluororesin, which are much larger than the PTFE resin sheet material with filler of Comparative Example 3 that has been used as a sliding material for a sliding bearing device, and is known for its compression resistance It was proved to be larger than Comparative Example 3 which is a body sheet.

Further, for the materials containing the lubricants of Examples 2 and 4 and Comparative Example 1, the speed dependence of the dynamic friction coefficient was measured, and the materials containing the lubricants of Examples 2 and 4 and Comparative Examples 1 and 3 were measured. For, the surface pressure dependence of the dynamic friction coefficient was measured. The results are shown in FIGS. 6 and 7, respectively.

The measurement conditions are as follows.
1) Speed dependence of dynamic friction coefficient
Measuring apparatus: 100 ton dynamic compression shear tester, measuring speed range: 12.6 to 400 mm / sec, waveform: sine curve, amplitude: 200 mm, frequency: 0.004 to 0.318 Hz, surface pressure: 20 N / mm ² , Load: 157 kN, Cycle: Friction coefficient at the third cycle was measured.
2) Dependence of dynamic friction coefficient on surface pressure
Measuring device: 100 ton dynamic compression shear tester, measuring surface pressure range: 2-60 N / mm ² , load range: 16-157 kN, waveform: sine curve, amplitude: 200 mm, frequency: 0.080 Hz, speed 100 mm / sec, cycle: Measure the friction coefficient at the third cycle.

From the results shown in FIGS. 6 and 7, the materials according to the present invention in Example 2 and Example 4 are both larger than those of the conventional Comparative Example 1 or Comparative Example 3 in large buildings such as buildings and bridges. It has been demonstrated that it has a low and stable dynamic coefficient of friction in a wide range of speeds and surface pressures required for low frictional sliding members for seismic isolation bearings mounted on the lower side.

From the above results, according to the present invention, an extremely low dynamic friction coefficient is achieved, and the compression strength is high when the lubricant is held with a high compressive strength, and sufficient compression to support a large building. A sliding member for a seismic isolation sliding bearing device having strength is obtained.

The expanded view which shows the structure of the sliding member for seismic isolation sliding support apparatuses of this invention. The detail expanded view for demonstrating the structure of the sliding member for seismic isolation sliding support apparatuses of this invention, and a manufacturing method. Schematic for demonstrating the structure of the sliding member which concerns on Example 1,2. Schematic for demonstrating the structure of the sliding member which concerns on Example 3, 4. FIG. The conceptual diagram which shows the use condition of the sliding member for seismic isolation sliding support apparatuses of this invention. The graph which shows the measurement result of the speed dependence of a dynamic friction coefficient. The graph which shows the measurement result of the surface pressure dependence of a dynamic friction coefficient.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sliding member, 3 ... Upper structure, 4 ... Lower structure, 5 ... Upper sliding member holding plate, 6 ... Opposite material, 11 ... Sliding member for seismic isolation sliding support device, 12, 13 ... Laminated body, 14, 24, 34, 44 ... reinforcement, 21, 22, 31, 32, 41, 42 ... composite.

Claims (3)

A seismic isolation slip comprising a plurality of laminates formed by laminating a plurality of composites of aramid fibers and fluororesin, and a heat-resistant mesh-like reinforcing material provided between the laminates. Sliding member for bearing device. The sliding member for a seismic isolation sliding bearing device according to claim 1, wherein a lubricant is contained in the laminate. The sliding member for a seismic isolation sliding bearing device according to claim 1 or 2, wherein the lubricant is silicone oil.

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