JP2010255797A - Method of manufacturing base isolation plug, and base isolation plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a base isolation plug which has reduced porosity without using lead for improving the damping performance of a base isolation device. <P>SOLUTION: The columnar base isolation plug 5 inserted into the base isolation device is manufactured in processes of preforming powder and grain materials to form a massive plug raw material 15 and press-molding the massive plug raw material 15 to form the columnar base isolation plug 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In particular, the present invention relates to a method for manufacturing a seismic isolation plug that ensures the excellent damping performance of a seismic isolation device as a seismic isolation plug for lead, and a seismic isolation plug manufactured by the method.

  Seismic isolation devices that are installed between a building and its foundation to protect the building by absorbing the impact and vibrations of earthquakes are composed of alternating elastic plates such as rubber and rigid plates such as steel plates. And a seismic isolation plug inserted into the hollow portion at the center of the laminate.

Laminated bodies of this type of seismic isolation device function to prevent the direct transmission of vibration to the building by deforming greatly in the horizontal direction under low shear modulus and large deformation capacity such as rubber. To do.
In addition, seismic isolation plugs are often made of lead as a whole, and when the laminate undergoes shear deformation due to the occurrence of an earthquake, the seismic isolation plug plastically deforms to generate vibration energy. It functions to absorb.
However, since lead has a large environmental load and a large cost for disposal, etc., attempts have been made to develop a seismic isolation plug for lead that can exhibit excellent damping performance and the like.

  For example, in Patent Document 1, instead of a lead seismic isolation plug, a plug made of a plastic fluid material and a hard filler in a hollow portion of a laminated body and filling a gap between the hard fillers with a plastic fluid material is provided. A technology that can stably secure the damping performance has been proposed in the same way as a lead seismic isolation plug when sealed and used for a long time.

  However, since the seismic isolation plug described in Patent Document 1 is manufactured by press-molding a granular material filled in a mold into a columnar shape at a predetermined surface pressure, particularly the lower side or outer periphery of the mold. On the other hand, due to friction between the mold wall and the plug material, lack of fluidity of the granular material, etc., the granular material is not compressed enough to create a void, which reduces the density of the seismic isolation plug. The vibration damping performance may be reduced.

  For this reason, for example, as disclosed in Patent Documents 2 and 3, the mold is rotated and vibrated, or as disclosed in Patent Documents 4 and 5, by heating the mold or the granular material, Techniques for making the density of the molded body uniform have been proposed.

However, in these conventional technologies, the porosity (air residual ratio) of the seismic isolation plug can be reduced, but since the powder and granular materials are molded at a high pressure, the seismic isolation plug is tightly tightened. Therefore, even if a local failure occurs at a specific location, even if there is no uniform collapse throughout, the earthquake vibration will always be deformed only at a certain location. Although the energy absorption capability against external force is reduced, the seismic isolation plug is difficult to collapse even if added, and the damping performance may be reduced.
In addition, there is a problem that waste of molding energy occurs due to high pressure molding of the powder and granular materials.

JP 2006-316990 A JP-A-5-132351 JP-A-6-23596 JP-A-11-140502 JP-A-10-193191

  The objective of this invention is providing the manufacturing method of the seismic isolation plug which can improve the damping performance of a seismic isolation apparatus, reducing the porosity of a seismic isolation plug, without using lead. .

  The manufacturing method of the seismic isolation plug according to the present invention is characterized in that a bulk plug material is formed through preforming of a granular material, and the bulk plug material is press-molded to form a columnar seismic isolation plug.

Here, the seismic isolation plug is a material in which shear stress and shear strain are proportional to the maximum yield point of elastic deformation, but when this yield point is exceeded, the behavior is such that the shear stress becomes almost constant. It shall contain at least a plastic fluidizing material and a hard filler.
The preform of the granular material can be not only plate-shaped but also strip-shaped, linear, string-shaped, columnar or spherical.

  More preferably, in such a method of manufacturing a seismic isolation plug, the preform is crushed into a massive plug material.

  The seismic isolation plug according to the present invention is manufactured by using any one of the above-described methods for manufacturing a seismic isolation plug.

  The manufacturing method of the seismic isolation plug according to the present invention is to form a lump plug material through preforming of the granular material, and press-molding this lump plug material, compared with the one that press-molds the granular material as it is, After forming the massive plug material with a small porosity, the massive plug material will be press-molded, the porosity of the entire seismic isolation plug will decrease, and the interface of the massive plug material will remain in the seismic isolation plug, Since the plug can be uniformly collapsed from there, the energy absorption ability can be enhanced. As a result, the damping property of the seismic isolation device can be improved.

  In addition, after the porosity of the preform is reduced by preforming the powder and granular material, the seismic isolation plug is molded at a lower pressure than conventional press molding in the seismic isolation plug pressing process. And the entire plug can be evenly collapsed with low pressure.

(A) is a top view which shows about the seismic isolation apparatus which press-fit the seismic isolation plug manufactured with the manufacturing method of this invention, (b) is a longitudinal cross-sectional view containing the center axis line of the seismic isolation apparatus. It is the figure which showed the process of the manufacturing method of the seismic isolation plug according to this invention. It is a figure which shows the result of having measured the porosity by the Example.

Hereinafter, the seismic isolation plug of the present invention will be described in detail with reference to the drawings.
1A is a top view showing a seismic isolation device in which a seismic isolation plug manufactured by the manufacturing method of the present invention is press-fitted, and FIG. 1B is a longitudinal section including the central axis of the seismic isolation device FIG.

The illustrated seismic isolation device 1 includes a plurality of disk-shaped rigid plates 2 and a plurality of disk-shaped elastic plates 3 that are alternately stacked, and have a cylindrical shape centering on a hollow portion that extends in the vertical direction. The laminated body 4, the seismic isolation plug 5 press-fitted into the hollow portion of the laminated body 4, and the laminated body 4 and the laminated body 4 fixed to the upper and lower ends of the seismic isolation plug 5 squeezed to the side. Each mounting face plate 6 is provided.
The mounting face plate 6 can be sealed by fixing or fixing to the upper end and the lower end of the laminated body 4 and the seismic isolation plug 5.

  Here, the laminated body 4 is formed by laminating the rigid plate 2 and a member such as an unvulcanized rubber composition, and then firmly adhering them by, for example, vulcanization adhesion. Do not.

  As shown in the drawing, the laminate 4 is covered with a covering material 7 that covers the outer peripheral surface, so that rain and light do not reach the inside of the laminate 4 from the outside, and deterioration of the laminate 4 due to oxygen, ozone, ultraviolet rays, or the like. Can be prevented.

  The rigid plate 2 may be a metal plate such as a steel plate, a ceramic plate, a reinforced plastic plate such as a fiber reinforced plastic, or the like. The elastic plate 3 may be a vulcanized product of unvulcanized rubber. be able to.

  The seismic isolation device 1 is attached to a building or the like by inserting a bolt through a bolt hole (not shown) formed in the mounting surface portion 6, and the building or the like is supported via the seismic isolation device 1.

When such a seismic isolation device 1 receives a shearing force in the horizontal direction due to vibration, the laminate 4 elastically shears and deforms as a whole, effectively absorbing vibration energy, and damping performance. Etc., it is possible to quickly attenuate the vibration.
Further, by alternately laminating the rigid plate 2 and the elastic plate 3, even when a load is applied in the vertical direction, the compression of the laminated body 4 is suppressed, and the elastic plate 3 is sufficiently sheared and deformed to save energy. Absorbs and can exert a restoring force. As a result, the laminate 4 can exhibit the effect of suppressing the amount of shear deformation and increasing the upper and lower springs.

FIG. 2 is a diagram showing the steps of a method for manufacturing a seismic isolation plug according to the present invention.
First, as shown in FIG. 2 (a), at least a powdered granular material containing a plastic fluidizing material and a hard filler is put into, for example, a press molding apparatus and a rolling molding apparatus, and they are preformed to form a lump. Form plug material.
By this preforming, the granular material can be formed as a massive plug material 15 having a smaller porosity.

  Next, as shown in FIG. 2 (b), the bulk plug material 15 is filled into the mold 11, and the upper and lower stampers 12 are moved in the vertical direction so as to be pushed into the mold 11 and press-molded. Thus, the seismic isolation plug 5 as shown in FIG. 2C can be obtained.

Here, preferably, the particle diameter of the massive plug material 15 is in the range of 1 mm to 2 cm.
By setting it as this range, the porosity of the massive plug material 15 itself can be reduced, and an interface having an appropriate area can be formed in the massive plug material 15.

Preferably, the porosity of the bulk plug material 15 is in the range of about 0 to 5%, and by setting this range, the porosity of the entire seismic isolation plug after press molding is reduced and compared with conventional press molding. The seismic isolation plug 5 can be formed with a low pressure.
It is preferable that the linear pressure for forming the massive plug material 15 is formed from the powder and granular material in the range of 2451.66 to 98066.5 N / cm (250 to 10000 kgf / cm).

And preferably, the porosity of the seismic isolation plug 5 is in the range of about 0 to 7%, and the pressure is preferably 49.03 to 127.49 MPa (500 to 1300 kgf / cm ² ).
Further, in this press molding, when the volume of the massive plug material 15 is reduced with respect to the pressure of the massive plug material 15, the interface remains moderately, which is advantageous for deformation of the seismic isolation plug 5 as a whole.

  By this manufacturing method, before the seismic isolation plug 5 is press-molded, the lump plug material 15 is formed in a close-packed arrangement with a sufficiently small gap between the granular materials, and the lump plug material 15 is press-molded. The seismic isolation plug 5 can be manufactured.

In this seismic isolation plug manufacturing method, preferably, after the preform is crushed, the massive plug material 15 is formed and press-molded.
For example, after forming a preform into a plate shape with a rolling forming apparatus, the preform is crushed into a massive plug material.
When the preform is crushed, if the preform has anisotropy in shape, the interface is not uniform and the plug is not easily collapsed. Therefore, it is desirable to make the shape nearly spherical.

  As a plastic fluidized material of granular material, although it is a viscoelastic body and exhibits some elasticity, it has great plasticity, can follow large deformations, and can re-aggregate in the same state again when it returns to the origin after vibration. Rubber (NR), polyisoprene rubber (IR), polybutadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), ethylene-propylene rubber, nitrile rubber, butyl rubber, halogenated butyl rubber, acrylic rubber, polyurethane , Silicone rubber, fluorinated rubber, polysulfide rubber, hyperon, ethylene vinyl acetate rubber, epichlorohydrin rubber, ethylene-methyl acrylate copolymer, styrene elastomer, urethane elastomer, polyolefin elastomer and the like. These components may be used alone or in a blend of two or more.

The hard filler of the granular material is a material mainly responsible for the damping performance of the seismic isolation plug 5, and specifically, attenuates vibrations by friction between powders and friction between powders and plastic fluidized material, for example, , Iron powder, stainless steel powder, zirconium powder, tungsten powder, bronze (CuSn) powder, aluminum powder, gold powder, silver powder, tin powder, tungsten carbide powder, tantalum powder, titanium powder, copper powder, nickel powder, niobium powder, iron- Nickel alloy powder, zinc powder, molybdenum powder, etc. are mentioned, and these metal powders may be used alone or in combination of two or more.
Among these hard fillers, iron powder is particularly preferable, and iron powder is inexpensive and has a high breaking strength as compared with other metal powders, and the seismic isolation plug 5 mainly composed of iron powder is: Since it is neither too hard nor too brittle, excellent damping performance can be demonstrated over a long period of time. Examples of the iron powder include reduced iron powder, electrolytic iron powder, sprayed iron powder, pure iron powder, and cast iron powder. Among these, reduced iron powder is preferable.

In addition to the particulates, generally added additives such as anti-aging agents, waxes, plasticizers, softeners and the like can be blended.
In addition, the composition of the material selected about each of a plastic fluid material and a hard filler, a content rate, a combination, etc. can be suitably changed according to the performance desired for the seismic isolation plug 5.

  And by forming the seismic isolation plug 5 using the manufacturing method mentioned above, the air content rate of the seismic isolation plug 5 becomes small, and the seismic isolation device press-fitted with this seismic isolation plug 5 has improved damping performance. In addition, since the time required to obtain the desired air content of the seismic isolation plug is shortened, the productivity and storability of the seismic isolation plug 5 can be improved.

Next, each of the example base isolation plugs 1 to 3 and the comparative example plug isolations 1 to 3 to be inserted into the base isolation device having the structure shown in FIG. (Air residual ratio) was evaluated.
The void ratio (residual ratio of air) is (1-specific gravity of the base isolation plug / calculated specific gravity of the powder material) × 100 (calculated specific gravity of the powder material: weight / (specific gravity of the plastic fluid material × volume ratio + hard). The specific gravity of the filler × volume ratio)).

Example seismic isolation plugs 1 to 3 were manufactured by the method described below.
First, as shown in FIG. 2 (b), the calculated specific gravity is 5.536 g / cm ³ , and 400 g of the preform formed of the plastic fluid material and the hard filler shown in Table 1 is shown in Table 2. Then, after forming by changing each specification, it is crushed by a crusher, and the crushed material is filled in a cylindrical mold having a volume of 160 cm ³ . Subsequently, the crushed material was press-molded with a stamper, and Example seismic isolation plugs 1 to 3 having an inner diameter of 45.0 mm and a height of 55 mm were manufactured. The result is shown in FIG.
In Example 3, the granular material was crushed with a crusher.

Comparative example seismic isolation plugs 1 to 3 were manufactured by the method described below.
First, 400 g of the granular material having a calculated specific gravity of 5.536 g / cm ³ and Tables 1 and 2 is filled into a cylindrical mold having a volume of 160 cm ³ . Subsequently, this powdery granular material was press-molded with a stamper to produce comparative example seismic isolation plugs 1 to 3 having an inner diameter of 45.0 mm and a height of 55 mm. The result is shown in FIG.
In addition, the comparative example seismic isolation plug 3 pulverized the granular material with a crusher.

* 1 (natural rubber)
Unvulcanized, RSS # 4
* 2 (Butadiene rubber (low cis structure))
Unvulcanized, Asahi Kasei "Diene NF35R"
* 3 Carbon Black ISAF, Tokai Carbon "Seast 6P"
* 4 Resins “Zeofine” manufactured by Nippon Zeon, “Nisseki Neopolymer 140” manufactured by Nippon Petrochemical, “Marcaretz M-890A” manufactured by Maruzen Petrochemical, “Zeofine”: “Nisseki Neopolymer 140”: “Marcaretz M-” 890A "= 40: 40: 20 (mass ratio)
* 5 Plasticizer Dioctyl adipate (DOA)
* 6 Other compounding agents Zinc white, stearic acid, anti-aging agent [“Anstage 6C” manufactured by Sumitomo Chemical, wax [“Proto Wax 1” manufactured by Nippon Oil Corporation], zinc white: stearic acid: anti-aging agent: wax = 4: 5: 3: 1 (mass ratio)

(Attenuation performance evaluation)
For each seismic isolation device into which the above-mentioned seismic isolation plug is press-fitted, a dynamic test machine is used to vibrate in the horizontal direction while applying a reference surface pressure in the vertical direction to cause shear deformation of the specified displacement. It was.
The vibration displacement was set such that the total thickness of the laminate was 100%, the strain was 50 to 250%, the vibration frequency was 0.33 Hz, and the vertical surface pressure was 10 MPa.
Here, for the sake of simplicity, as the area ΔW of the region surrounded by the hysteresis curve of the relationship between the horizontal deformation displacement (d) and the horizontal load (Q) of the seismic isolation device increases, the vibration energy increases. The damping performance of the seismic isolation plug was evaluated based on the intercept load Qd (horizontal load value at zero displacement) at a strain of 150%.
The intercept load Qd was calculated from the formula: Qd = (Qd ₁ + Qd ₂ ) / 2 using loads Qd ₁ and Qd ₂ at the point where the hysteresis curve intersects the vertical axis. Also, td was calculated by dividing Qd by the cross-sectional area A of the seismic isolation plug. Here, these calculated values indicate that as Qd or td increases, the area of the region surrounded by the hysteresis curve increases and the attenuation performance is excellent.

And the said measurement and calculation of Q and t were performed with respect to each seismic isolation apparatus (100 pieces for every Example). As a result to the value of td in the distortion 150% is non td150% = 85kgf / cm ² as compared to 80% or less of the t (t150% = 68kgf / cm 2 or less) it became isolator (80% The number of seismic isolation structures was counted. The results are shown in Table 2.

  From the results of Table 2 and FIG. 3, the example seismic isolation plugs 1 to 3 had better damping performance than the comparative example seismic isolation plugs 1 to 3.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Rigid board 3 Elastic board 4 Laminated body 5 Seismic isolation plug 6 Mounting face plate 7 Coating material 11 Mold 12 Stamper 15 Mass plug material

Claims (3)

In manufacturing columnar seismic isolation plugs to be inserted into seismic isolation devices,
A method of manufacturing a seismic isolation plug, comprising: forming a bulk plug material after preforming a powder and granular material; and pressing the bulk plug material to form a columnar seismic isolation plug.   The method for producing a seismic isolation plug according to claim 1, wherein the preform is crushed to form a massive plug material.   The seismic isolation plug manufactured with the manufacturing method of Claim 1 or 2.

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