JP6848411B2 - Slip bearing structure - Google Patents

Description

The present invention relates to a sliding bearing structure.

Sliding bearing slide plates used for seismic isolation devices in buildings and the like are required to have a low coefficient of friction, corrosion resistance, durability, and the like. In order to satisfy these requirements, for example, a polytetrafluoroethylene resin plate and a stainless steel plate have been used as slip surfaces.

Here, when the slip support has an extremely small friction coefficient of about μ = 0.01, if the slip surface starts to slip due to seismic motion, it becomes difficult to brake the slip state, so that the damper It is necessary to brake the slip condition by installing and suppressing the slip distance. However, in the case of a small building such as a house, it is difficult to secure a space for installing a normal damper, and it is desired to apply a smaller damper or omit the damper itself.

Therefore, various attempts have been made in the past to control the friction coefficient of the sliding plate of the sliding bearing within a desired range with the aim of applying a smaller damper or omitting the damper itself.

For example, the following Patent Document 1 discloses that molybdenum disulfide is used as an anti-sticking agent while achieving a desired coefficient of friction and preventing the slip surface from sticking. Patent Document 3 discloses that a predetermined paint (Patent Document 2) or grease (Patent Document 3) is applied in order to improve the lubricity on the support surface of the sliding support.

On the other hand, conventional studies have been conducted on methods for utilizing the lubricity of fluororesins. For example, the following Patent Document 4 proposes a technique for plasma-treating a fluororesin, and one of the uses of the fluororesin is slip bearing.

Further, although no mention is made regarding the sliding bearing, a crystalline layered material is contained in the surface layer of the plated steel sheet for the purpose of reducing the sliding resistance during press forming (in other words, improving the lubricity). A technique for forming a film has been proposed (see Patent Document 5 below).

Japanese Unexamined Patent Publication No. 9-242382 Japanese Unexamined Patent Publication No. 2000-23185 Japanese Unexamined Patent Publication No. 2000-320611 Japanese Unexamined Patent Publication No. 2012-153791 JP-A-2010-242188

However, the anti-sticking agent using molybdenum disulfide disclosed in Patent Document 1 has a problem that it becomes sticky at the time of construction and that desired performance cannot be obtained after being left for a long period of time. Further, when applying the paint or grease as disclosed in Patent Document 2 and Patent Document 3, there is a problem that the number of steps is increased. Further, even if the plasma treatment on the fluororesin disclosed in Patent Document 4 is used, it is difficult to sufficiently improve the lubricity.

Further, when the lubricity of the sliding plate of the sliding bearing is measured by forming a film, it is desirable that the film to be formed is a thick film, but a film containing a crystalline layered material by the method disclosed in Patent Document 5 above. It is difficult to thicken the film when forming. In addition, the method disclosed in Patent Document 5 cannot form a film having sufficient adhesion.

In this way, there is still room for improvement in the technology for appropriately controlling the friction coefficient of the sliding plate while maintaining the performance as a sliding bearing for a long period of time, and it is easier to apply a smaller damper or omit the damper. The current situation is that the technology to realize it is sought.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is for slip bearings, which can more easily realize the application of a smaller damper or the omission of a damper. To provide the structure.

As a result of diligent studies on the above problems, the present inventors have made a film containing a crystalline layered material containing a predetermined layered double hydroxide and a resin on at least a part of the sliding plate surface and / or the sliding contact surface. It was found that it is possible to control the friction coefficient of the sliding contact surface within a desired range while maintaining the adhesion of the film by using the steel sheet on which the above is formed, and the application of a smaller damper. Alternatively, we have completed a structure for sliding bearings that can more easily realize the omission of dampers.
The gist of the present invention completed based on the above findings is as follows.

[1] A sliding plate and a sliding material having a sliding contact surface that is in sliding contact with the sliding plate surface of the sliding plate are provided, and at least a part of the sliding plate surface and / or the sliding contact surface is a steel plate and the said. It has a coating film for coating a steel plate, and the steel plate has a surface of Zn, Zn-Al alloy, Zn-Al-Si alloy, Zn-Al-Mg alloy, Zn-Al-Mg-Si alloy, and the like. A plated steel sheet having a plating layer containing at least one selected from the group consisting of a Zn-Fe alloy, a Zn-Ni alloy, and an Al-Si alloy, wherein the film is a crystalline layered material and a resin composition. The average thickness of the film is 10 nm to 10000 nm, and the crystalline layered product has a chemical formula [M ²⁺ _(1-x) M ³⁺ _x (OH) ₂ ] [ ^An- ] _{x. A structure for sliding support, which contains a layered double hydroxide represented by / n} · zH ₂ O and has a friction coefficient of the sliding contact surface with respect to the surface of the sliding plate of 0.05 to 0.15.
Here, in the chemical formula,
M ²⁺ : One or more selected from the group consisting of ^{Mg 2+} , Ca ²⁺ , Fe ²⁺ , Ni ²⁺ , Zn ²⁺ , Pb ²⁺ , and Sn ^{2+ M 3+} : Al ³⁺ , Fe ³⁺ , Cr ³⁺ , 3/4 Zr ^4+, and, one or more selected from the group consisting of ^{Mo 3+ A n-: OH -,} F -, CO 3 2-, Cl -, Br -, (C 2 O 4) 2-, I -, ( NO ₃ ) ^- , (SO ₄ ) ^2- , (BrO ₃ ) ^- , (IO ₃ ) ^- , (V ₁₀ O ₂₈ ) ^6- , (Si ₂ O ₅ ) ^2- , (ClO ₄ ) ^- , (CH ₃ COO) ^- , [C ₆ H ₄ (CO ₂ ) ₂ ] ^2- , (C ₆ H ₅ COO) ^- , [C ₈ H ₁₆ (CO ₂ ) ₂ ] ^2- , n (C ₈ H ₁₇ SO ₄₎ ) ^- , TPPC, n (C ₁₂ H ₂₅ SO ₄ ) ^- , n (C ₁₈ H ₃₇ SO ₄ ) ^- , and SiO ₄ ^4-, which is one or more selected from the group.
[2] the ^{M 2+ is, Mg 2+, Ca 2+, Fe} 2+, Ni 2+, and is at least one selected from the group consisting of ^{Zn 2+,} wherein ^{M 3} + ^is, Al 3+, ^{Fe 3+,} and is at least one selected from the group consisting of ^{Cr 3+,} wherein ^A n- _{^{is, OH -, CO 3 2-,}} Cl -, and _one kind selected from the group consisting of ^2- _(SO ⁴⁾ The above-mentioned structure for sliding bearings according to [1].
[3] The sliding bearing structure according to [1] or [2], wherein the resin composition is at least one of a water-soluble urethane-based resin composition and a water-soluble polyolefin-based resin composition.
[4] The sliding bearing structure according to any one of [1] to [3], wherein the average film thickness is more than 2000 nm and 5000 nm or less.
[5] The sliding bearing structure according to any one of [1] to [4], wherein each of the sliding plate surface and the sliding contact surface has the steel plate and the coating film.
[6] The sliding bearing structure according to any one of [1] to [5], wherein the film further contains wax.
[7] The sliding bearing structure according to [6], wherein the wax is at least one selected from the group consisting of polyethylene, polypropylene, and polytetrafluoroethylene.
[8] The structure for sliding bearings according to [6] or [7], wherein the content of the wax is 0.5% by mass to 20% by mass with respect to the mass of the total solid content in the film.
[ 9 ] The sliding bearing structure according to any one of [1] to [8], wherein the thickness of the plating layer is 1 μm to 100 μm.

As described above, according to the present invention, it is possible to more easily apply a smaller damper or omit the damper.

It is a schematic cross-sectional view which shows the slide bearing structure which concerns on 1st Embodiment of this invention. It is a schematic cross-sectional view which shows the slide bearing structure which concerns on 2nd Embodiment of this invention. It is a schematic side view explaining the mechanism of seismic isolation by a structure for a sliding bearing.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

<Seismic isolation mechanism using a sliding bearing structure>
Prior to explaining the sliding bearing structure according to the embodiment of the present invention, an example of the seismic isolation mechanism by the sliding bearing structure will be briefly described with reference to FIG.
FIG. 3A is a schematic side view of the sliding bearing structure 100 in normal times. The sliding bearing structure 100 is installed between the building 200 and the foundation 300. The sliding bearing structure 100 includes a sliding plate 110 mounted on the foundation 300, a sliding material 120 that is in sliding contact with the sliding plate 110, and an elastomer that is a rubber-like elastic body laminated on the sliding material 120. The 130 and the base spot 140 for fixing the elastomer 130 to the building 200 are provided. In FIG. 3, a damper that suppresses the sliding distance of the sliding material 120 is not shown.

FIG. 3B is a schematic side view of the sliding bearing structure 100 when a horizontal force is applied. For example, in the sliding bearing structure 100 to which a horizontal force is applied as a result of the foundation 300 being displaced to the right in FIG. 3B due to an earthquake, the elastomer 130 first follows the displacement of the foundation 300. By shear deformation, the displacement of the building 200 in the horizontal direction is suppressed and the seismic isolation function is exhibited. For example, in the case of a weak earthquake, the sliding bearing structure 100 can absorb the horizontal force only by the shear deformation of the elastomer 130, and the sliding material 120 is in sliding contact with the sliding plate 110 without sliding. Keep it as it is. If the earthquake subsides with a weak earthquake, the horizontal force will decrease, the amount of shear deformation of the elastomer 130 will decrease, and the sliding bearing structure 100 will eventually return to the normal state shown in FIG. 3A.

FIG. 3C is a schematic side view of the sliding bearing structure 100 when the horizontal force exceeds the sliding horizontal load. For example, when an earthquake changes from a weak earthquake to a medium or strong earthquake, the horizontal force applied to the sliding bearing structure 100 increases, and the horizontal force becomes a sliding horizontal load, that is, between the sliding plate 110 and the sliding material 120. It will exceed the frictional resistance. In this case, the sliding bearing structure 100 cannot absorb the horizontal force only by the shear deformation of the elastomer 130, the elastomer 130 is shear-deformed, and the sliding contact surface 120a of the sliding material 120 is the sliding plate 110. By sliding the surface 110a of the above, the seismic isolation function is exhibited. When the earthquake subsides, the horizontal force decreases, the amount of shear deformation of the elastomer 130 decreases, and the sliding of the sliding member 120 subsides, and the sliding bearing structure 100 eventually becomes normal as shown in FIG. 3A. Return to the state of time.

<First Embodiment>
Subsequently, the sliding bearing structure according to the first embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a schematic cross-sectional view showing a sliding bearing structure 101 according to the first embodiment of the present invention.

The sliding bearing structure 101 according to the present embodiment includes a sliding plate 111 and a sliding material 121 having a sliding contact surface 121a that is in sliding contact with the surface 111a of the sliding plate 111. Here, at least a part of the surface 111a of the sliding plate 111 and / or the sliding contact surface 121a of the sliding material 121 according to the present embodiment has a steel plate and a film covering the steel plate, and the sliding material 121 is slipped. It is preferable that each of the surface 111a of the plate 111 and the sliding contact surface 121a of the sliding material 121 have a steel plate on which the above-mentioned film is formed. FIG. 1 shows a case where the surface 111a of the sliding plate 111 and the sliding contact surface 121a of the sliding material 121 each have a steel plate and a film.

As shown in FIG. 1, the sliding plate 111 is preferably a plated steel plate 114 in which the surface of the base steel plate 112 is coated with the plating layer 113, and the surface of the plated steel plate 114 is coated with the coating 115. There is. In such a case, the surface of the film 115 functions as the surface 111a of the sliding plate 111.

Further, the sliding material 121 is preferably a plated steel plate 124 in which the surface of the base steel plate 122 is coated with the plating layer 123, and the surface of the plated steel plate 124 is covered with the film 125. In such a case, the surface of the film 125 functions as the sliding contact surface 121a of the sliding material 121.

By forming the sliding plate 111 and the sliding material 121 using a plated steel plate, it is possible to easily control the friction coefficient of the sliding contact surface 121a of the sliding material 121 with respect to the surface 111a of the sliding plate 111 within a desired range. Become.

As the sliding contact surface 121a of the sliding material 121 slides on the surface 111a of the sliding plate 111, the sliding contact surface 121a and the surface 111a are worn away. When the film 115 or 125 disappears due to wear due to sliding, the plating layer 113 or the plating layer 123 is exposed and slides due to the plating layer. When these plating layers are further eliminated, the steel material 112 or the steel material 122 is exposed and slides on the steel material. If the plating layer 113 or the plating layer 123 is slid in an exposed state, the friction coefficient may be slightly increased as compared with the case of the film. Further, if the base steel plates 112 and 122 are slid in an exposed state, the friction coefficient is further increased, and it may be difficult to sufficiently exhibit the seismic isolation performance as a sliding bearing structure. However, since the sliding contact surface 121a and the surface 111a have the film 115 and the film 125, respectively, it is possible to suppress the exposure of the plating layers 113 and 123 and the base steel sheets 112 and 122 due to sliding. As a result, the increase in the coefficient of friction due to sliding can be suppressed, and the seismic isolation performance of the sliding bearing structure can be exhibited for a longer period of time.

Further, when the film 115 or the film 125 disappears due to wear due to sliding, the plating layer 113 or the plating layer 123 is exposed and slides by the plating layer, but when the plating layer is destroyed by sliding, the plating layer 113 or the plating layer 123 is destroyed. A part of the plated layer functions as a lubricant between the surface 111a of the sliding plate 111 and the sliding contact surface 121a to mitigate the increase in the friction coefficient and maintain the seismic isolation function of the sliding bearing structure 101. be able to.

Here, the method for forming the plating layer 113 and the plating layer 123 is not particularly limited, and various known methods such as various hot-dip galvanizing methods and electrolytic plating methods can be used. is there.

For example, the plating layers 113 and 123 of the plated steel plates 114 and 124 are Zn, Zn-Al alloy, Zn-Al-Si alloy, Zn-Al-Mg alloy, Zn-Al-Mg-Si alloy, Zn-Fe alloy, etc. It can contain at least one selected from the group of Zn—Ni alloys and Al—Si alloys. A plating layer containing these not only functions as a lubricant for alleviating an increase in the coefficient of friction, but also prevents corrosion of steel materials and satisfies corrosion resistance for a long period of time. The seismic isolation function can be maintained for a long period of time.

The thickness (average thickness) of the plating layer 113 and / or the plating layer 123 is preferably 1 μm to 100 μm. If the thickness of the plating layer is less than 1 μm, the function as a lubricant may not be sufficiently exhibited, or the corrosion resistance may not be sufficiently satisfied. Further, when the thickness of the plating layer exceeds 100 μm, there is a possibility that the smoothness of the surface of the plating layer may be problematic and the seismic isolation performance may be deteriorated. Further, it may be difficult to form a plating layer exceeding 100 μm in one plating treatment, which may be industrially unfavorable because a plurality of treatments are required and the number of plating layer forming steps increases. is there. When the thickness of the plating layer is 1 μm to 100 μm, it is possible to sufficiently exhibit the anticorrosion property and the function as a lubricant industrially, so that the seismic isolation function as the slide bearing structure 101 can be satisfied. .. When the thickness of the plating layer 113 and / or the plating layer 123 is 5 μm to 50 μm, the plating process is facilitated, which is more preferable. The thickness of the plating layer 113 and / or the plating layer 123 is more preferably 10 μm to 30 μm.

Further, in the present embodiment, plated steel plates 114 and 124 are given as examples as the above-mentioned steel plates, but the present invention is not limited to such examples, and various known steel plates as the above-mentioned steel plates are used. A steel plate can be used. For example, as the steel sheet according to the present embodiment, various ordinary steels and various plated steel sheets obtained by subjecting ordinary steels to various known plating treatments can be used, and for example, stainless steel sheets and the like. It is also possible to use various types of iron alloys and the like. The ordinary steel is not particularly limited as long as it has a desired strength and the like.

The films 115 and 125 according to the present embodiment contain a crystalline layered material and a resin composition, and the crystalline layered material has a chemical formula [M ²⁺ _(1-x) M ³⁺ _x (OH) ₂ ] [ ^{An. −} ] Contains layered double hydroxides represented by _{x / n} · zH _{2 O.} By containing the above-mentioned crystalline layered material and the resin composition in the films 115 and 125, the surface 111a of the sliding plate 111 and the sliding material 121 can be slid while maintaining sufficient adhesion between the films 115 and 125. The coefficient of friction with the contact surface 121a can be set in a suitable range. As a result, in the sliding bearing structure 101 according to the present embodiment, it becomes easy to brake the sliding of the sliding member 121 without using a damper or by applying a small damper.

The crystalline layered material slides and deforms when a shear deformation stress is applied during sliding, and absorbs the shear deformation stress generated in the films 115 and 125. As a result, in the sliding bearing structure 101 according to the present embodiment, the desired friction coefficient is realized by the coatings 115 and 125 containing the crystalline layered material. Further, when the films 115 and 125 contain the resin composition, suitable adhesion of the films 115 and 125 to the steel sheet is realized.

For these films 115 and 125, an electrolytic solution containing the above-mentioned crystalline layered material and resin composition is prepared, and after performing cathode electrolysis using a steel plate such as a plated steel sheet as a cathode using such an electrolytic solution. , Ringer roll or the like, the liquid film thickness is controlled by using a known method, and further, it can be formed by appropriately drying. Further, in the sliding bearing structure 101 according to the present embodiment, by forming the films 115 and 125 by such a method, it is possible to realize a thick film while maintaining good adhesion. ..

In the present embodiment, the crystalline layered product means a crystal in which plate-shaped covalent crystals are laminated with relatively weak bonds such as intermolecular force, hydrogen bond, and electrostatic energy in a unit crystal lattice. Among them, the structural chemical formula ^{_{[M 2+ (1-x)}} M 3+ x (OH) 2] layered double hydroxide represented by _{[A n-] x / n ·} zH 2 O is positively charged It has a layered crystal structure because negatively charged anions are bonded to plate-shaped divalent and trivalent metal hydroxides by electrostatic energy to maintain an electrical balance and are laminated in layers. ing. Therefore, in the present embodiment, the layered double hydroxide is a compound suitable for use as a crystalline layered product.

Whether or not the compound used as the crystalline layered product has crystallinity can be determined by identifying the crystal structure of the compound of interest, and the crystal structure can be determined by a thin film X-ray diffraction method or the like. It is possible to specify by a known method of. The chemical formula ^{_{[M 2+ (1-x)}} M 3+ x (OH) 2] is either a layered double hydroxide represented by _{[A n-] x / n ·} zH 2 O, known X-ray diffraction It can be identified by the method.

Here, in the above chemical formula, the metal ion represented by ^{M 2+} is one or more selected from the group consisting of ^{Mg 2+} , Ca ²⁺ , Fe ²⁺ , Ni ²⁺ , Zn ²⁺ , Pb ²⁺ , and Sn ^2+. is there. Among the above metal ions, Mg ²⁺ , Ca ²⁺ , Fe ²⁺ , Ni ²⁺ , and Zn ²⁺ have been confirmed as naturally or artificially generated layered double hydroxide species, and such metal ions are also found. Since the layered double hydroxide having the above can be stably present, it is more preferable as a metal ion represented by ^{M 2+.}

In the above chemical formula, the metal ion represented by ^{M 3+} is one or more selected from the group consisting of ^{Al 3+} , Fe ³⁺ , Cr ³⁺ , 3/4Zr ⁴⁺ , and Mo ^3+. Among the above metal ions, in particular, Al ³⁺ , Fe ³⁺ , and Cr ³⁺ have been confirmed as naturally or artificially produced layered double hydroxide species, and layered double hydroxide having such metal ions. Since the substance can exist stably, it is more preferable as a metal ion represented by ^{M 3+.}

In Chemical ^Formula, anion represented by ^{A n- _{is, OH -, F -, CO}} 3 2-, Cl -, Br -, (C 2 O 4) 2-, I -, (NO 3) -, ( SO ₄ ) ^2- , (BrO ₃ ) ^- , (IO ₃ ) ^- , (V ₁₀ O ₂₈ ) ^6- , (Si ₂ O ₅ ) ^2- , (ClO ₄ ) ^- , (CH ₃ COO) ^- , [ C ₆ H ₄ (CO ₂ ) ₂ ] ^2- , (C ₆ H ₅ COO) ^- , [C ₈ H ₁₆ (CO ₂ ) ₂ ] ^2- , n (C ₈ H ₁₇ SO ₄ ) ^- , Tetrakis (4) -Carboxyphenyl) Porphyrin (TPPC), n (C ₁₂ H ₂₅ SO ₄ ) ^- , n (C ₁₈ H ₃₇ SO ₄ ) ^- , and SiO ₄ ^4- selected from the group. These anion species have been confirmed to incorporate layered double hydroxides as interlayer anions, and can exist as layered double hydroxides. Of the above anions, OH ⁻ , CO ₃ ^2- , Cl ⁻ , and (SO ₄ ) ^2- are more likely to be incorporated as interlayer anions than other anions of layered double hydroxides. for a short period of time of film formation becomes possible, as the anion represented by a ^n-, more preferred. Moreover, CO ₃ ^2-among the anionic species, as an ion source, it is possible to use carbon dioxide in the atmosphere.

The films 115 and 125 according to the present embodiment contain a resin composition in addition to the above crystalline layered material. As mentioned earlier, when the films 115 and 125 contain the resin composition, it is possible to improve the adhesion of the films 115 and 125. In the sliding bearing structure 101 according to the present embodiment, the resin composition is preferably at least one of a water-soluble urethane-based resin composition and a water-soluble polyolefin-based resin composition.

The urethane-based resin composition is a polyurethane resin composition produced by condensation of a compound having an isocyanate group and a hydroxyl group. The olefin resin composition is a composition of a polyolefin resin which is a hydrocarbon having one double bond. Examples of such polyolefin resins include resins such as polyethylene and polypropylene. In the present embodiment, it is preferable to use a water-soluble urethane-based resin composition or polyolefin-based resin composition.

In addition, these olefin resin compositions and urethane resin compositions may contain known additives. Examples of such an additive include a leveling agent that promotes the smooth formation of a film, a defoaming agent that eliminates bubbles in the film and on the surface of the film during film formation, and the like.

In the sliding bearing structure 101 according to the present embodiment, the average film thickness of the films 115 and 125 is in the range of 10 nm to 10000 nm (10 μm). If the average film thickness is thinner than 10 nm, the film will soon wear and disappear due to sliding, the steel plate will be exposed earlier, the friction coefficient will increase, and the seismic isolation performance of the sliding bearing structure will be exhibited. The time will be shortened. Further, when the average film thickness exceeds 10,000 nm, there is no problem in seismic isolation performance, but there are cases where it is industrially unfavorable because a plurality of treatments are required and the number of film forming steps increases. Further, when the average film thickness exceeds 10000 nm, biting may occur and problems such as peeling of the coating film during sliding may occur. When the average film thickness is in the range of 10 nm to 10,000 nm, the seismic isolation function as a sliding bearing structure can be industrially satisfied. The average film thickness of the films 115 and 125 is preferably in the range of more than 2000 nm and 10000 nm or less, and more preferably in the range of more than 2000 nm and 5000 nm or less.

The average thickness of the films 115 and 125 can be measured by observing a cross section processed by a focused ion beam (FIB) using an ultra-low acceleration voltage scanning electron microscope (ultra-low acceleration SEM). Is. That is, the cross section processed by the FIB is observed in a plurality of fields of view under an appropriate magnification. At this time, in each field of view, the film thickness is calculated at a plurality of positions, and the average film thickness is calculated for each field of view. After that, the average value of the average film thickness in each field of view can be further calculated between the plurality of fields of view, and the obtained average value can be used as the average film thickness of the films 115 and 125. Further, the thicknesses (average thickness) of the plating layers 113 and 123 can be measured in the same manner.

In the present embodiment, the coefficient of friction of the sliding contact surface 121a of the sliding material 121 with respect to the surface 111a of the sliding plate 111 is in the range of 0.05 to 0.15. If the coefficient of friction is less than 0.05, a larger damper is required, and if the coefficient of friction exceeds 0.15, the seismic isolation effect is impaired. When the coefficient of friction is within this range, the effect of damping the horizontal force can be obtained. Therefore, by applying a small damper or without using a damper, the slip material 121 can exert a seismic isolation function. It becomes easy to brake the sliding of. The coefficient of friction is preferably in the range of 0.08 to 0.12.

Here, the coefficient of friction (μ) is determined by the frictional force (F) acting on the surface 111a of the sliding plate 111 and the sliding contact surface 121a of the sliding material 121, and the sliding contact surface 121a of the surface 111a of the sliding plate 111 and the sliding material 121. It is the ratio of the pressure acting vertically, that is, the vertical effect (N) corresponding to the load of the building 200. The relationship between μ, F and N is as shown in the following equation (1).

F = μN ・ ・ ・ (1)

As for the friction coefficient, when the friction force F is the maximum static friction force which is the friction force immediately before the sliding member 121 slides, the friction coefficient μ is the static friction coefficient. Further, when the frictional force F is the dynamic frictional force which is the frictional force while the sliding material 121 is sliding, the friction coefficient μ is the dynamic friction coefficient. In the present invention, the friction coefficient is both a static friction coefficient and a dynamic friction coefficient, and the static friction coefficient and the dynamic friction coefficient are in the range of 0.05 to 0.15.

The films 115 and 125 according to the present embodiment may further contain wax in addition to the above components. Since the wax has a characteristic of gathering on the surface layer of the film, the friction coefficient can be more easily controlled by containing the wax.

The films 115 and 125 can contain at least one selected from the group consisting of polyethylene, polypropylene and polytetrafluoroethylene as the wax. Since the wax as described above has excellent long-term stability, the coefficient of friction is more stable, and the seismic isolation function of the sliding bearing structure can be ensured for a longer period of time.

The wax content in the films 115 and 125 is preferably, for example, 0.5% by mass to 20% by mass with respect to the mass of the total solid content in the film. When the wax content is 0.5% by mass to 20% by mass, the seismic isolation function of the sliding bearing structure can be ensured for a longer period of time without impairing the performance of the film. If the wax content is less than 0.5% by mass, the wax performance may not be fully exhibited. On the other hand, if the wax content is more than 20% by mass, the effect of the wax may be saturated and the friction coefficient may become too small. When the wax content is 1% by mass to 20% by mass, the friction coefficient can be controlled more strictly, which is more preferable. The wax content in the films 115 and 125 is more preferably 1% by mass to 5% by mass.

As described above, the sliding bearing structure 101 according to the present embodiment has been described in detail with reference to FIG.

In the first embodiment, the case where the film 115 is formed on the entire surface of the surface 111a of the sliding plate 111 and the film 125 is formed on the entire surface of the sliding contact surface 121a has been described, but the present invention is limited to such an example. It's not something. That is, the friction coefficient of the sliding contact surface 121a with respect to the surface 111a of the sliding plate 111 may be within the range of 0.05 to 0.15, and if such a range is satisfied, the surface 111a and / or the sliding contact surface of the sliding plate 111 may be satisfied. A film may be formed on at least a part of 121a. For example, the film 115 may be formed only on the surface of the sliding plate 111, or the film 125 may be formed only on a part of the sliding contact surface of the sliding material 121.

<Second Embodiment>
Next, the sliding bearing structure according to the second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view showing a sliding bearing structure 102 according to a second embodiment of the present invention.

In the sliding bearing structure 102 according to the present embodiment, the configurations of the sliding plate 111 and the sliding material 121 are the same as the configurations of the sliding plate 111 and the sliding material 121 of the sliding bearing structure 101 according to the first embodiment. .. Therefore, in the following, detailed description of these sliding plate 111 and sliding material 121 will be omitted.

In the sliding bearing structure 102 according to the present embodiment, the sliding plate 111 is placed on the sole plate 150, and the sliding plate 111 can be reinforced by the sole plate 150. For example, the slip plate 111 can be fixed to the foundation by fastening the sole plate 150 to the foundation with a fastener such as a bolt.

Further, in the sliding bearing structure 102 according to the present embodiment, the elastomer 130 is laminated on the sliding material 121, and the base spot 140 is further provided on the elastomer 130. The elastomer 130 exhibits a seismic isolation function by being sheared and deformed when a horizontal force is applied to the sliding bearing structure 102. The base spot 140 also reinforces the sliding material 121 and the elastomer 130. For example, the sliding material 121 can be fixed to the building by fastening the base spot 140 to the building with a fastener such as a bolt.

In the present embodiment, the sliding bearing structure 102 in which the elastomer 130, the base spot 140, and the sole plate 150 are added to the sliding bearing structure 101 according to the first embodiment has been described. It is also possible to replace it with another configuration. For example, a fixing plate for fixing the sliding member 121 to the elastomer 130 can be added to the sliding bearing structure 102 according to the present embodiment. Further, the elastomer 130 may be composed of, for example, only natural rubber, or may be composed of a laminated natural rubber and a steel plate.

As described above, the sliding bearing structure 102 according to the present embodiment has been briefly described with reference to FIG.

<Manufacturing method>
Next, an example of a method for manufacturing a sliding bearing structure according to each embodiment of the present invention will be described.

The sliding plate can be, for example, ordinary steel on which a plating layer and / or a film is formed (for example, one having a length of 60 cm, a width of 60 cm, and a thickness of 2 mm). Further, stainless steel (for example, SUS304: length 60 cm × width 60 cm × thickness 2 mm) can be used as it is, or a film can be formed to form a sliding plate.

Further, the slip material can be, for example, ordinary steel on which a plating layer and / or a film is formed (for example, a circular shape having a diameter of 50 mm and a thickness of 2 mm). Further, stainless steel (for example, SUS304: a circle having a diameter of 50 mm and a thickness of 2 mm) can be used as it is, or a film can be formed to form a slip material.

At this time, the above-mentioned film is formed on at least one of the sliding plate and the sliding material.

Further, the plating treatment for forming the plating layer can be carried out according to a known method, and can be carried out, for example, according to the work process of hot-dip galvanizing of JIS H8641. It is also possible to use continuously plated steel strips and steel plates specified in the JIS G3300 series, or other plated steel plates and steel strips. Specific plating types include, for example, Zn, Zn-Al alloy, Zn-Al-Si alloy, Zn-Al-Mg alloy, Zn-Al-Mg-Si alloy, Zn-Fe alloy, Zn-Ni alloy and the like. Al—Si alloys can be used.

The film is prepared by preparing an electrolytic solution containing the above-mentioned crystalline layered material and resin composition, performing cathode electrolysis using the electrolytic solution using a steel sheet such as a plated steel sheet as a cathode, and then using a ringer roll or the like. It can be formed by controlling the liquid film thickness using a known method and further drying it appropriately. Here, the current density and the energization time at the time of cathode electrolysis may be appropriately set according to the film thickness of the film to be formed. When the film contains wax, the wax to be used may be mixed with the electrolytic solution in advance.

Using the sliding plate and sliding material manufactured as described above, the sliding material is slid on the surface of the sliding plate so that the central axis of the sliding plate and the central axis of the sliding material coincide with each other. It can be a structure for use.

Hereinafter, the present invention will be described in detail based on Examples. The examples shown below are merely examples of the sliding bearing structure according to the present invention, and the sliding bearing structure according to the present invention is not limited to the following examples.

[Material of slip plate and slip material]
Hot-rolled steel plate with a thickness of 1.6 mm and hot-rolled steel plate with a thickness of 1.6 mm are plated with hot-dip Zn with a film thickness of 20 μm, Zn-5% Al plating with a film thickness of 18 μm, and Zn- with a film thickness of 18 μm. 6% Al-3% Mg plating, Zn-11% Al-3% Mg-0.2% Si plating with a film thickness of 18 μm, Zn-55% Al-1.6% Si plating with a film thickness of 20 μm, film thickness 20 μm Zn-55% Al-2% Mg-1.6% Si plating, Zn-9% Fe plating with a film thickness of 7 μm, Zn-13% Ni plating with a film thickness of 3 μm, or Al-9% with a film thickness of 30 μm. Those formed with any of Si plating were prepared respectively. These prepared steel sheets were used as materials for a sliding plate and a sliding material.

In the column of "slip plate / sliding material" in Table 1 below, for those described as "steel", a sliding plate and a sliding material were formed by using a hot-rolled steel plate having a plate thickness of 1.6 mm. It means that. Further, in the same column, the fact that the components of the plating layer are described means that the sliding plate and the sliding material are formed by using the steel plate on which the described plating layer is formed. In this case, the numbers in parentheses in the same column mean the film thickness (unit: μm) of the plating layer.

[Crystalline layered material]
A layered double hydroxide was used as the crystalline layered product, and an aqueous solution having the composition shown in Table 1 below was prepared as an electrolytic solution.

The material to be coated (the above-mentioned steel plate having a thickness of 1.6 mm) was electrolytically degreased with an aqueous NaOH solution, then immersed in an electrolytic solution and energized to precipitate a layered double hydroxide. The film thickness was adjusted by the current density, and the current density was changed in the range of 1 ^{to 10 A / dm 2.} After electrolysis, the film was taken out from the electrolytic solution, the film thickness was controlled by a ringer roll, and the film was subsequently placed in a drying oven to form a film to obtain a film having a predetermined average film thickness.

As a result of analyzing the obtained film by using a thin film X-ray diffraction method, it was clarified that the layered double hydroxide has crystalline property. In addition, the composition of the layered double hydroxide formed from each electrolytic solution was identified as shown in Table 1 above.

[Resin composition]
Further, as the resin composition, a water-soluble urethane resin composition was used. This resin composition was mixed in the above aqueous electrolyte solution, if necessary. The water-soluble urethane resin composition used was synthesized as follows. That is, 230 g of a polyester polyol having an average molecular weight of 900 synthesized from adipic acid having a hydroxyl group at the terminal and 1,4-butylene glycol, and 15 g of 2,2-bis (hydroxymethyl) propionic acid are N-methyl-2. -In addition to 100 g of pyrrolidone, the mixture was heated to 80 ° C. to dissolve it. Then, 100 g of hexamethylene diisocyanate was added, the mixture was heated to 110 ° C. and reacted for 2 hours, and 11 g of triethylamine (boiling point 89 ° C.) was added for neutralization. The obtained solution was added dropwise to an aqueous solution prepared by mixing 5 g of ethylenediamine and 570 g of deionized water under strong stirring to obtain a water-soluble polyurethane resin.

[wax]
As the wax, polyethylene resin (PE), polypropylene resin (PP), and polytetrafluoroethylene resin (PTFE) were prepared, and 10% by mass was added to the aqueous electrolyte solution as needed.

The following items were evaluated for each of the obtained sliding bearing structures.

[Film filmability and adhesion]
The film-forming property and adhesion were evaluated by attaching cellophane tape (trade name: cellophane tape (registered trademark)) to the film and then inspecting the peeling state of the film when the cellophane tape was peeled off. The evaluation criteria are as follows.

⊚: No peeling ○: Partially peeled ×: Peeled during film formation

[Coefficient of friction]
The sliding plate was cut out to a width of 30 mm and a length of 300 mm, and the sliding material was punched out with a diameter of 20 mmφ so that the sliding contact surfaces of the two sliding materials were brought into contact with both sides of the sliding plate. Then, a surface pressure N = 10 MPa (pressurizing pressure 31.4 KN) was applied to the sliding material, and the load F when the sliding plate was pulled out at a constant speed (16.7 mm / s) was measured. The average value of the friction coefficient μ = N / F at the center of 130 mm when pulled out by 150 mm was used as the evaluation value. The evaluation criteria are as follows.

⊚: 0.08 ≤ μ ≤ 0.12
◯: 0.05 ≦ μ <0.08 or 0.12 <μ ≦ 0.15
X: μ <0.05 or μ> 0.15

[Friction durability]
Friction durability was evaluated using a pin-on disc friction tester. Specifically, the steel balls shown below were slid on the test piece cut out to 50 mm, and the number of laps when the friction coefficient was 0.05 to 0.15 was determined. The evaluation criteria are as follows.

Steel ball: Dimension 3/16, Material Chrome steel SUJ2, Grade G-28
No oil coating: No oil coating for both steel balls and slip materials Load: 14.7N
Rotation speed: 100 rpm (sliding diameter = radius 10 mm)
Temperature: Normal temperature

⊚: 100 times or more ○: 50 times or more and less than 100 times ×: 50 times or less

[Comprehensive evaluation]
Based on the above evaluation results, each sliding bearing structure was comprehensively evaluated according to the following criteria. The evaluation criteria are as follows.

◎: The evaluation result of each evaluation item is ◎
○: The evaluation result of each evaluation item is ○ or higher, but all the evaluation results are not ◎ ×: There is × in any of the evaluation results of each evaluation item.

The evaluation results for each sliding bearing structure are summarized in Table 2 below.

As is clear from Table 2 above, the sliding support structure corresponding to the example of the present invention has an appropriate value for the friction coefficient of the sliding surface, and also has good film forming property, adhesion, and friction durability. On the other hand, it can be seen that the friction coefficient of the sliding surface of the sliding bearing structure corresponding to the comparative example does not have an appropriate value.

<Summary>
As described above, in the case of the sliding bearing structure according to the embodiment of the present invention, a small damper can be applied without increasing the number of post-treatment steps when installing the sliding bearing structure, without using a damper. By doing so, it becomes easy to brake the sliding of the sliding material while exhibiting the seismic isolation function. In particular, by providing a plating layer on the sliding plate and the material used as the sliding material, the seismic isolation function of the sliding bearing structure can be extended.

Further, for example, even in the case of a small building such as a house where it is difficult to secure a space for installing a normal damper, it is possible to provide a seismic isolation method using the sliding bearing structure according to the embodiment of the present invention. it can.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical idea described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

100, 101, 102 Slip bearing structure 110, 111 Slip plate 110a, 111a Slip plate surface 112, 122 Base steel plate 113, 123 Plating layer 114, 124 Plated steel plate 115, 125 Film 120, 121 Slip material 120a, 121a Sliding contact surface of slip material 130 Elastomer 140 Base pot 150 Sole plate 200 Building 300 Foundation

Claims (9)

Sliding board and
A sliding material having a sliding contact surface that is in sliding contact with the sliding plate surface of the sliding plate,
With
At least a part of the sliding plate surface and / or the sliding contact surface has a steel plate and a film covering the steel plate.
The steel plate has Zn, Zn-Al alloy, Zn-Al-Si alloy, Zn-Al-Mg alloy, Zn-Al-Mg-Si alloy, Zn-Fe alloy, Zn-Ni alloy, and Al on the surface. A plated steel sheet having a plating layer containing at least one selected from the group consisting of −Si alloys.
The film is a film containing a crystalline layered material and a resin composition.
The average film thickness of the film is 10 nm to 10000 nm.
The crystalline layered product comprises the chemical formula ^{_{[M 2+ (1-x)}} M 3+ x (OH) 2] layered double hydroxide represented by _{[A n-] x / n ·} zH 2 O,
A structure for sliding bearings, wherein the friction coefficient of the sliding contact surface with respect to the surface of the sliding plate is 0.05 to 0.15.

Here, in the chemical formula,
M ²⁺ : One or more selected from the group consisting of ^{Mg 2+} , Ca ²⁺ , Fe ²⁺ , Ni ²⁺ , Zn ²⁺ , Pb ²⁺ , and Sn ^{2+ M 3+} : Al ³⁺ , Fe ³⁺ , Cr ³⁺ , 3/4 Zr ^4+, and, one or more selected from the group consisting of ^{Mo 3+ A n-: OH -,} F -, CO 3 2-, Cl -, Br -, (C 2 O 4) 2-, I -, ( NO ₃ ) ^- , (SO ₄ ) ^2- , (BrO ₃ ) ^- , (IO ₃ ) ^- , (V ₁₀ O ₂₈ ) ^6- , (Si ₂ O ₅ ) ^2- , (ClO ₄ ) ^- , (CH ₃ COO) ^- , [C ₆ H ₄ (CO ₂ ) ₂ ] ^2- , (C ₆ H ₅ COO) ^- , [C ₈ H ₁₆ (CO ₂ ) ₂ ] ^2- , n (C ₈ H ₁₇ SO ₄₎ ) ^- , TPPC, n (C ₁₂ H ₂₅ SO ₄ ) ^- , n (C ₁₈ H ₃₇ SO ₄ ) ^- , and SiO ₄ ^4-, which is one or more selected from the group. The M ²⁺ is one or more selected from the group consisting of ^{Mg 2+} , Ca ²⁺ , Fe ²⁺ , Ni ²⁺ , and Zn ^2+.
Wherein ^{M 3} + ^is, Al 3+, ^{Fe 3+,} and is at least one selected from the group consisting of ^{Cr 3+,}
Wherein ^A n- ^{_{is, OH -, CO 3 2-,}} Cl -, _{and, (SO} ⁴⁾ is at least one selected from the group consisting of ^2-, sliding bearings for structures according to claim 1. The sliding bearing structure according to claim 1 or 2, wherein the resin composition is at least one of a water-soluble urethane-based resin composition and a water-soluble polyolefin-based resin composition. The sliding bearing structure according to any one of claims 1 to 3, wherein the average film thickness is more than 2000 nm and 5000 nm or less. The sliding bearing structure according to any one of claims 1 to 4, wherein each of the sliding plate surface and the sliding contact surface has the steel plate and the coating film. The sliding bearing structure according to any one of claims 1 to 5, wherein the film further contains wax. The sliding bearing structure according to claim 6, wherein the wax is at least one selected from the group consisting of polyethylene, polypropylene, and polytetrafluoroethylene. The structure for sliding bearings according to claim 6 or 7, wherein the content of the wax is 0.5% by mass to 20% by mass with respect to the mass of the total solid content in the film. The sliding bearing structure according to any one of claims 1 to 8, wherein the thickness of the plating layer is 1 μm to 100 μm.

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