JP2009047194A - Method of manufacturing stacked base isolation bearing and plug forming device used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a stacked base isolation bearing capable of largely reducing the gaps contained in a plug and a plug forming device used for the method. <P>SOLUTION: This method of manufacturing a stacked base isolation bearing 10 comprises the step of forming the plug 4 by containing an elastically deformable material in a mold and pressing and forming it and the step of inserting the plug 4 into a hollow part 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention has a laminate formed by alternately laminating a rigid plate having rigidity and an elastic plate having elasticity in the height direction, and provided with hollow portions that open at both ends in the height direction of the laminate, In particular, the present invention relates to a method of manufacturing a laminated seismic isolation bearing in which a plug body made of a plastically deformable material in which a viscoelastic body and a rigid powder are mixed and a plug body molding apparatus used therefor. The present invention relates to a material that can significantly reduce the contained voids.

  As shown in FIG. 1, the laminate 3 is formed by alternately laminating a rigid plate 1 having rigidity and an elastic plate 2 having elasticity in the height direction, and opens at both ends in the height direction of the laminate 3. A hollow seismic isolation bearing 10 is known in which a hollow portion 5 is provided, and a plug body 4 made of a plastically deformable material in which a viscoelastic body and a rigid powder made of metal, for example, are mixed is arranged in the hollow portion 5. (For example, refer to Patent Document 1).

This plug body 4 functions to absorb the deformation energy when the building or the like supported by the laminated seismic isolation bearing 10 swings to attenuate the swinging, and is thus configured to have high damping characteristics. Conventionally, such a laminated seismic isolation bearing 10 is formed by directly filling the hollow portion 5 with the granular material of the plastically deformable material after preparing the laminated body 3.
JP 2006-316990 A

  However, according to this method, since the granular material of the plastically deformable material is accommodated in the laminate 3, it cannot be pressurized at a high pressure, and in addition to the voids contained in the raw material, There is a problem that voids generated by entraining air remain without being removed, and a desired damping characteristic cannot be exhibited due to a decrease in the mass of the plastically deformable material contained in the predetermined volume.

  The present invention has been made in view of such problems, and provides a method of manufacturing a laminated seismic isolation bearing capable of greatly reducing the gaps included in the plug body and a plug body molding apparatus used therefor. For the purpose.

  The invention described in claim 1 has a laminate formed by alternately laminating a rigid plate having rigidity and an elastic plate having elasticity in the height direction, and opens at both ends in the height direction of the laminate. In a method of manufacturing a laminated seismic isolation bearing, in which a hollow part is provided, and a plug body made of a plastically deformable material in which a viscoelastic body and a rigid powder are mixed is provided in the hollow part, the plastically deformable material is a mold. The method of manufacturing a laminated seismic isolation bearing includes a step of forming the plug body by compressing it after being housed in and a step of inserting the plug body into the hollow portion.

  The invention described in claim 2 is the manufacturing method of the laminated seismic isolation bearing according to claim 1, wherein the rigid powder is made of metal.

The invention described in claim 3 is a plug body forming device used in the manufacturing method of the laminated seismic isolation bearing described in claim 1 or 2,
A hollow mold having hollow portions that are open at both ends; and a pair of end surface forming molds that press-mold the granular material of the plastically deformable material contained in the hollow portion from both sides of the hollow portion. The plug body forming apparatus is configured to displace both molds relative to the hollow mold.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, in the third aspect, the one of the end surface forming molds is fixed to a base, and the other of the end surface forming molds is spaced apart from the one end surface forming mold. The plug body forming apparatus is provided with a displacement mechanism and is fixed to the base via an urging means so that the hollow mold can be displaced in parallel with the direction in which the other end face forming mold is displaced.

  According to the invention described in claim 1, the step of forming the plug body by press-molding the plastically deformable material in a mold and the step of inserting the plug body into the hollow portion Therefore, the ratio of the void remaining in the plug body, that is, the void ratio can be greatly reduced, and the mass of the plastically deformed material contained in the predetermined volume is ensured to achieve the desired damping characteristics. Can be made.

  According to the second aspect of the present invention, since the rigid powder is made of metal, it is possible to improve the attenuation characteristic with respect to the deformation energy of the plug body.

According to the invention described in claim 3, a hollow mold having a hollow portion that opens at both ends, and the granular material of the plastically deformable material accommodated in the hollow portion are pressure-molded from both sides of the hollow portion. Since it comprises a pair of end face forming molds, a plug body required in the manufacturing method of the laminated seismic isolation bearing according to <1> can be efficiently produced, and both the end face forming molds are converted into the hollow molds. Since it is configured to be relatively displaced, the compression margin can be increased as compared with the case where only one of the end surface forming molds is relatively displaced with respect to the hollow mold, as will be described in detail later. As a result, the porosity can be further reduced.
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  According to a fourth aspect of the present invention, there is provided an end surface forming type displacement mechanism that fixes one of the end surface forming dies to a base and moves the other end surface forming die away from the one end surface forming die. Since the hollow mold is fixed to the base via the urging means so that the hollow mold can be displaced in parallel with the displacement direction of the other end face forming mold, only one of the end face forming molds needs to be driven, The apparatus can be configured very simply.

  Embodiments of the present invention will be described with reference to the drawings. 2 is a partial cross-sectional view schematically showing a plug body forming apparatus according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view corresponding to the arrow AA in FIG. The molding apparatus 20 includes a hollow mold 22 having a hollow portion 23 that opens at both ends, and a pair of end face forming molds that press-mold the granular material M of a plastically deformable material accommodated in the hollow portion 23 from both sides of the hollow portion 23. 24, 25. Here, the hollow mold 22 and the pair of end surface forming molds 24 and 25 constitute a mold for pressure-molding a plastically deformable material.

  One end surface forming die 24 is fixed to the base 21, and an end surface forming die displacement mechanism 26 is provided to function so that the other end surface forming die 25 is spaced apart from one end surface forming die 24. The hollow mold 22 is fixed to the base 21 via a biasing means 27 made of, for example, a spring so that the hollow mold 22 can be displaced in parallel with the direction in which the other end face forming mold 25 is displaced.

  In order to form a plug body using such a plug body forming apparatus 20, the end face forming die displacement mechanism 26 is operated to drive the other end face forming die 25 away from the one end face forming die 24. Then, one end of the hollow portion 23 is opened, and then a predetermined amount of a granular material M of a plastically deformable material prepared in advance is manually or separately supplied into the hollow portion 23 as shown in FIG. Set to the state shown in.

  Thereafter, the end surface forming die 25 is actuated to drive the other end surface forming die 25 in a direction to approach the one end surface forming die 24, so that the end surface forming die 25 is plastically deformed as shown in FIG. To a position where it abuts against the upper surface of the granular material M. Thereafter, in order to pressurize the granular material M of the plastically deformable material, the end face forming mold displacement mechanism 26 is operated at a high output to bring the end face forming molds 25 and 26 closer. As a result, the voids in the granular material M are eliminated and compressed by the compression allowance μ, and the movable side end surface forming die 25 approaches the fixed side end surface forming die 24 and at the same time is also displaced relative to the hollow die 22. However, the hollow mold 22 cannot be displaced further.

  This is because when the granular material M is compressed, it starts to be compressed from a portion close to the end face forming mold 25, and when the portion where the compression is started is no longer compressed and solidifies, the compressed portion is adjacent to the uncompressed portion. As the process of compressing the portion progresses, the compressed portion gradually expands. At the same time, the pressure that the granule M tries to spread the hollow mold 22 from the inside increases, and the compressed granule When the height region of M reaches the limit value ν, the compressed portion and the hollow mold 22 cannot be displaced relative to each other by the frictional force, and as a result, the other end surface forming mold 25 is further changed into the hollow mold 22. This is because relative displacement becomes impossible.

  If the other end surface forming die 25 is further brought closer to the one end surface forming die 24, the hollow die 22 is supported by the base 21 via the biasing means 27. The base 21 is approached against the drag force. As a result, the fixed one end face forming die 24 is relatively displaced to the hollow die 22 to be in the state shown in FIG. This relative displacement is equal to the relative displacement between the one end surface forming mold 25 on the movable side and the hollow mold 22, and the relative displacement is μ, and the compressed granular material M has a high height. A region ν is generated.

  As a result of the operation as described above, the end face forming dies 24 and 25 approach each other by 2μ, and when the height of the granular material M before pressing is λ, the compression rate of the granular material M is (2μ / λ). In addition, a compressed granular material M having a total height region 2ν can be generated. Then, the larger the total relative displacement amount, and the higher the height region of the total compressed granular material M, the larger the amount of voids remaining at the beginning. This means that it can be eliminated, and a high porosity can be obtained.

  In the above description, for the sake of easy understanding, the other end surface forming mold 25 is relatively displaced with respect to the hollow mold 22, and the one end surface forming mold 25 is relatively displaced with respect to the hollow mold 22. However, in actuality, these steps proceed simultaneously or with a slight time difference.

  As described above, by pressurizing the granular material M with the end face forming dies 24 and 25, the porosity can be significantly reduced as compared with the case where the granular material M is not pressurized, and as described above, As shown in FIG. 6, the plug body forming apparatus 20 configured to displace both end surface forming dies 24 and 25 relative to the hollow die 22 fixes one end surface forming die 24 and forms the other end surface. Compared with the plug body forming apparatus 90 configured to displace only the mold 25 relative to the hollow mold 22, approximately twice as many voids can be eliminated.

  Then, after pressure-molding the granular material M, the other end surface forming mold 25 is displaced in a direction away from the one end surface forming mold 24 to open one end of the hollow portion 23, and the molded granular material M is hollowed out. The plug body 4 can be formed by taking out from the portion 23. Thereafter, in order to form the laminated seismic isolation bearing 10 shown in FIG. 1, the plug body 4 may be disposed in the hollow portion 5 provided in the laminated body 3.

  FIG. 7 is a partial cross-sectional view showing another embodiment of the plug body molding apparatus 30. The plug body molding apparatus 30 is accommodated in a hollow mold 32 having a hollow portion 33 that opens at both ends, and the hollow portion 32. A pair of end surface forming dies 34 and 35 for pressure-molding the granular material M of the plastically deformable material from both sides of the hollow portion 23 are provided.

  Both end surface forming molds 24 and 25 are driven to approach each other by end surface forming type displacement mechanisms 37 and 36 fixed to the base 21 respectively. As a result, the granular material M housed in the hollow portion 33 is driven. As with the plug body forming apparatus 20 of the embodiment described above, the void ratio can be reduced by compressing by 2 μm. In this respect, the same effect as the plug body forming apparatus 20 can be obtained. However, the plug body forming apparatus 20 having the above-described aspect is superior in that the apparatus can be simply configured in that one end face forming displacement mechanism can be used.

  The plug body forming apparatus 20 shown in FIG. 2 was used as an example, and the plug body forming apparatus 90 shown in FIG. 6 was used as a comparative example, and the porosity of plug bodies formed using them was compared. The results are shown in Table 1.

In both the examples and the comparative examples, as the granular material M of the plastically deformable material, a granular material having an average particle diameter of 40 μm formed by mixing and dispersing unvulcanized rubber and iron powder is used. The diameter was 44 mm, the initial filling height of the granular material M into the hollow portion was 110 mm, and the pressure for pressing the granular material M was 20 tons.
In Table 1, the porosity is assumed that the weight of air is zero, and the specific gravity of the granular material obtained in advance is compared with the specific gravity obtained from the volume and weight of the plug body after pressure molding. Calculated. The volume of the plug body after the pressure molding was calculated based on measurement with a caliper, and the weight was measured with a scale.

  As is clear from Table 1, it can be seen that the porosity of the example can be reduced to nearly half that of the comparative example.

It is sectional drawing which shows the laminated seismic isolation bearing which concerns on this invention. It is a fragmentary sectional view which shows the plug body shaping | molding apparatus of embodiment which concerns on this invention. It is sectional drawing corresponding to the AA arrow of FIG. It is sectional drawing of the plug body shaping | molding apparatus which shows the state in one process at the time of forming a plug body using a plug body shaping | molding apparatus. It is sectional drawing of the plug body shaping | molding apparatus which shows the state in the process following FIG. It is a fragmentary sectional view which shows the plug body shaping | molding apparatus as a comparative example. It is a fragmentary sectional view which shows the plug body shaping | molding apparatus of other embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rigid board 2 Elastic board 3 Laminated body 4 Plug body 5 Hollow part of laminated body 10 Laminated seismic isolation bearing 20 Plug body shaping | molding apparatus 21 Base 22 Hollow mold 23 Hollow part 24 One end surface formation type 25 Other end surface formation type 26 End surface Forming-type displacement mechanism 27 Energizing means 30 Plug body forming device 32 Hollow mold 33 Hollow portion 34 One end face forming mold 35 The other end face forming mold

Claims (4)

A laminate having a rigid plate having rigidity and an elastic plate having elasticity alternately laminated in the height direction is provided, and hollow portions are provided at both ends in the height direction of the laminate, and the hollow portion is provided in the hollow portion. In the method of manufacturing a laminated seismic isolation bearing in which a plug body made of a plastically deformable material obtained by mixing a viscoelastic body and a rigid powder is disposed
A method of manufacturing a laminated seismic isolation bearing, comprising: housing the plastically deformable material in a mold; and forming the plug body by pressure molding the material; and inserting the plug body into the hollow portion.   The manufacturing method of the laminated seismic isolation bearing according to claim 1, wherein the rigid powder is made of metal. A plug body forming device used in the method for manufacturing a laminated seismic isolation bearing according to claim 1 or 2,
A hollow mold having hollow portions that are open at both ends; and a pair of end surface forming molds that press-mold the granular material of the plastically deformable material contained in the hollow portion from both sides of the hollow portion. A plug body forming apparatus configured to displace both molds relative to the hollow mold.   An end surface forming mold displacement mechanism is provided that fixes one of the end surface forming molds to a base and moves the other end surface forming mold away from and close to the one end surface forming mold, and the hollow mold is connected to the other end surface. 4. The plug body forming apparatus according to claim 3, wherein the plug body forming apparatus is fixed to the base via an urging means so that the forming mold can be displaced in parallel with a direction in which the forming mold is displaced.

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