JP3944292B2 - Manufacturing method of seismic isolation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a seismic isolation device that is mainly installed on a foundation of a structure and absorbs energy generated in the event of an earthquake to reduce the influence on the structure.
[0002]
[Prior art]
In general, as a seismic isolation device for a large building structure, a method of using an elastic blocker (isolator) that supports the weight of the structure and relieves vibration and a horizontal vibration absorber (for example, a lead damper) is used. For relatively small and medium-sized buildings, seismic isolation devices that have both an isolator and a damper are installed. As a seismic isolation device having a structure that also serves as an isolator and a damper, a device in which cylindrical lead is inserted into a hollow portion of a laminated isolator in which rigid material plates and elastic plates are alternately stacked is known. Yes. For example, there are those disclosed in JP-A-9-105440 and JP-A-9-105441.
[0003]
In those disclosed in Japanese Patent Laid-Open Nos. 9-105440 and 9-105441, an elastic material layer (rubber) and a rigid material layer (metal plate) are alternately stacked in a hollow portion of an elastic body. In the case of trying to absorb the horizontal vibration energy by press-fitting columnar lead, the ratio of the volume Ve of the hollow portion to the volume Vp of the columnar lead, that is, Vp / Ve = 1.02 to 1.12. It is said to be the most effective. The reason for this is that if Vp / Ve = 1.02 or less, a gap is generated between the inner circumferential surface of the elastic body (the inner circumference of the hollow portion) and the outer circumferential surface of the columnar lead in contact therewith, and the desired seismic isolation The effect is not obtained. In addition, Vp / Ve = 1.12 or more is structurally unreasonable, and if it is forcibly performed, the elastic material layer (rubber) of the elastic body is excessively compressed, and the early deterioration and the elastic body itself are damaged. It is said that.
[0004]
[Problems to be solved by the invention]
In the above-mentioned seismic isolation device, in order to obtain a structure in which cylindrical lead is inserted into the center portion of a conventionally known laminated elastic body, a hollow portion formed in the center portion of the laminated elastic body is inserted into the center portion. It is aimed to improve the functionality in the combination part of both by specifying the relationship with the outer shape of the cylindrical lead that is, but about the insertion of the cylindrical lead into the laminated elastic body hollow part which is a problem here, It is difficult to handle like ordinary metals.
[0005]
The reason is that columnar lead is a material that is more easily plastically deformed than other metal materials such as carbon steel, alloys thereof, and copper alloys. That is, in this type of seismic isolation device, when the cylindrical lead is inserted into the hollow portion of the laminated elastic body, the space between the inner peripheral surface of the hollow portion and the outer peripheral surface of the cylindrical lead to be inserted is set. If there is a gap, the seismic isolation effect during operation will be significantly hindered. Therefore, it is important to incorporate the columnar lead so as to be in close contact with the hollow portion. However, inserting the cylindrical lead with the outer diameter of the cylindrical lead and the inner diameter of the hollow portion of the laminated elastic body having a general fitting dimension gives a pressing force in the axial direction to the cylindrical lead. Then, the columnar lead to be inserted is a reaction force and a pressing force for press-fitting that are received while entering the hollow portion due to frictional resistance force during press-fitting between the distal end portion in the insertion direction and the hollow inner peripheral surface of the laminated elastic body. When the balance is lost, the end portion on the pressing side is plastically deformed to prevent entry, and there is a problem that the so-called close fitting cannot be achieved by insertion.
[0006]
In addition, lead materials have lower hardness than other structural materials such as carbon steel and copper alloys, and are highly extensible. Therefore, the lead material has rigidity with the elastic material layer (rubber) constituting the laminated elastic body. It is very difficult to enter the material layer (metal plate) in the direction orthogonal to the circumferential surface having different hardness in the hollow portion by reducing the dimensional difference. As a result, even if the cylindrical lead is fitted into the hollow portion of the laminated elastic body, it cannot be combined unless it is substantially free of voids. Therefore, it is very difficult to obtain the configuration as in the prior art, and it is naturally difficult to manufacture and expensive. Moreover, there is still a problem in enhancing the seismic isolation effect by reliably eliminating the gap between the two.
[0007]
In the present invention, a manufacturing method capable of rationally creating a seismic isolation device having a high seismic isolation effect using very simple means by solving such problems and utilizing the characteristics of lead of the material in question Is intended to provide.
[0008]
[Means for solving the problems and actions / effects]
In order to achieve such an object, the manufacturing method of the seismic isolation device of the present invention includes:
In manufacturing a seismic isolation device formed by inserting cylindrical lead into the hollow portion of the laminated elastic body,
a) A lead tube is inserted into the hollow portion of the laminated elastic body, and flanges are welded to both ends of the lead tubular body, and fixed to the laminated elastic body,
b) Applying a closing plate to each of the flanges on both sides to make the lead tubular body fitted and fixed to the laminated elastic body airtight;
c) A pressure fluid is allowed to flow into the airtight lead pipe, the lead pipe is expanded and deformed, and is closely fixed to the inner peripheral surface of the hollow elastic body,
d) Processing is performed so that the inner surface of the lead tubular body that is closely fixed to the inner peripheral surface of the hollow portion of the laminated elastic body is smooth,
e) A lead cylinder having an outer diameter that matches the inner diameter is inserted into the lead pipe body, and both ends are welded to the upper and lower surfaces of the fixed lead portion to form a cylindrical lead integrally.
It is characterized by this.
[0009]
In the present invention, the cylindrical lead that is fitted and integrated in the hollow portion of the laminated elastic body is inserted into the lead tube first, and fluid pressure is applied from the inside, so that the plastic deformation of the lead is easy. By utilizing the property of easy recrystallization at room temperature, a close state to the inner peripheral surface corresponding to the constituent material of the laminated elastic body is obtained, in other words, the lead pipe body is attached to the elastic material layer according to the amount of deformation. After inflating and intimate contact, and smoothing the inner surface of the inserted lead tube deformed by subsequent processing, the lead cylinder of the size to be fitted is pushed in and welded at the end to make it integral The hollow portion can be tightly filled with lead. This eliminates the occurrence of a gap between the outer circumferential surface of the columnar lead and the inner circumferential surface of the hollow elastic body, and has the effect of more reliably absorbing horizontal vibration energy due to earthquakes and the like. Things are obtained.
[0010]
Moreover, in the manufacturing method of the seismic isolation device of the present invention, the lead cylindrical body to be inserted into the lead tube tightly fixed to the inner peripheral surface of the laminated elastic body has a tapered outer shape. It is good. This facilitates the operation of inserting the lead cylindrical body into the lead pipe body which has been closely fixed to the inner peripheral surface of the laminated elastic body in advance, so that both are integrated, and vibration energy is generated in the hollow part of the laminated elastic body. The cylindrical lead that absorbs the effect of being able to finish in a state of being tightly packed with no gap with respect to the elastic layer.
[0011]
In the laminated elastic body , irregularities are formed on the inner peripheral surface of the hollow portion by alternately combining a rigid material layer having a hole in the center and an elastic material layer having an inner diameter larger than the inner diameter of the rigid material layer. When the pressure fluid is allowed to flow into the lead pipe body, the lead pipe body is swelled along the irregularities so that the lead pipe body is inside the hollow portion of the laminated elastic body. if as closely fixed to the peripheral surface, for the formed hollow portion peripheral surface unevenness of the laminated elastic body, advances enter Toe lead pipe-body is expanded by the fluid pressure from the interior by the plastic deformation As a result, the volume of the columnar lead fitted into the hollow portion can be increased without difficulty and the effect of absorbing vibration energy can be increased.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the method for manufacturing a seismic isolation device according to the present invention will be described with reference to the drawings.
[0013]
FIG. 1 shows a longitudinal sectional view of an embodiment of a seismic isolation device having a laminated elastic body structure obtained by the manufacturing method of the present invention. The seismic isolation device 1 has an annular steel plate 3 provided with a hole 3 'in the center and formed in a required dimension, and an elastic plate 4 (hereinafter referred to as an elastic plate) formed in an annular shape alternately. The laminated elastic body 2 bonded to the required height, the columnar lead 10 filling the hollow portion 5 formed at the center of the laminated elastic body 2, and the thick rigid steel plates attached to both the upper and lower surfaces It is comprised with the mounting plates 6 and 6 which become.
[0014]
The seismic isolation device 1 having such a configuration is manufactured through the following process. The manufacturing process will be described with reference to FIGS.
First, the steel plate 3 and the elastic plate 4 constituting the laminated elastic body 2 are made of natural rubber as an elastic plate that is substantially the same or slightly thicker than a known steel plate, and they are alternately stacked by a known means. Adhesive and vulcanized to obtain the required laminated elastic body 2.
In this case, it is preferable to use the elastic plate 4 having an inner diameter of the hole 4 ′ slightly larger than the inner diameter of the hole 3 ′ of the steel plate 3.
[0015]
The inner periphery of the hollow portion 5 formed at the center portion of the laminated elastic body 2 obtained as described above is in relation to the diameter of the hole 3 ′ in the portion of the steel plate 3, as shown in FIG. Since the diameter of the hole 4 ′ of the elastic plate 4 is slightly increased, the elastic plate 4 is recessed to form an inner peripheral surface that is uneven in the axial direction.
[0016]
Next, as shown in FIG. 2 (b), a lead-made tubular body 11 having an outer diameter that can be inserted into the hollow portion 5 of the laminated elastic body 2 formed in the previous step and having an appropriate thickness (for example, a thickness of 10 mm). Are inserted so that both ends protrude from the hollow portion 5 respectively. The lead pipe body 11 used here is formed of a lead material having a purity of 99.99% or more. Then, a lead flange 12 prepared in advance is welded to the end protruding from the end surface of the laminated elastic body 2 of the lead tube 11 to treat the lead tube 11 so as not to come out of the hollow portion 5. At this time, it is preferable that the flange 12 is welded so as not to float from the end face of the laminated elastic body 2.
[0017]
When the lead pipe 11 is attached to the hollow portion 5 of the laminated elastic body 2 in this way, blind flanges 13 and 13 are attached to both ends of the lead pipe 11 and the lead pipe is formed in the next step. An operation of fixing the body 11 is performed. First, as shown in FIG. 2 (c), a lead-made tubular body is formed by applying a highly rigid fixing member 18 such as a steel plate of appropriate thickness to the outside of the blind flanges 13 and 13 and fastening them with bolts 19 or the like. 11 is sealed. In this state, a pipe is connected to the one blind flange 13 side from the discharge side of the water pressure pump P, and the water pressure pump P applies a water pressure (for example, about 10 kg / cm ² ) to pressurize.
[0018]
When the water pressure is applied to the lead tube 11 in this way, the lead tube 11 is a soft material having a good extensibility, so that it gradually plastically deforms, and its outer peripheral surface and the hollow portion 5 of the laminated elastic body 2. It is pushed into the space between the inner peripheral surface and bulges along the irregularities formed by the hole 3 ′ of the steel plate 3 and the hole 4 ′ of the elastic plate 4 forming the inner peripheral surface of the hollow portion 5. As a result, as shown in FIG. 2 (d), the outer peripheral portion of the lead tube 11 is filled in close contact with the inner peripheral surface of the hollow portion 5 of the laminated elastic body 2, and the inside of the hollow portion 5 of the laminated elastic body 2. The lead tube 11 is completely fixed to the peripheral surface.
[0019]
When the lead tube 11 is processed in this way, the fixing member 18 is removed, the blind flanges 13 and 13 are removed, and the lead tube whose inner peripheral surface becomes uneven in the next step. The inner surface 11a of the body 11 is machined to finish it to a smooth surface. At this time, the inner surface to be machined, such as cutting, is finished so that the uneven portion does not remain (see FIG. 3A).
[0020]
Thereafter, as shown in FIG. 3 (b), a lead cylinder finished to a size that can be separately processed and fitted into a hollow portion 5 'made of lead having a smooth inner surface and finished. The body 10a is fitted. As the lead cylindrical body 10a used here, one that has been processed into a slightly tapered shape whose outer periphery is slightly narrowed in the distal direction is used. By inserting and fitting the tapered lead cylindrical body 10a in this way, it is possible to easily and easily fit each other formed of a material whose surface is soft. Thereafter, when pressure is applied by pressing from the insertion side, the tube-side inner peripheral surface 11a and the outer peripheral surface 10a ′ of the lead cylindrical body 10a are brought into close contact with each other, and are made of the same material and are soft. The cylindrical lead 10 is tightly fitted in the hollow portion 5 of the elastic body 2 (see FIG. 3C).
[0021]
Thus, if the lead cylinder 10a is loaded, the both ends of the insertion are trimmed, and the end of the lead tube 11 that is tightly fitted in advance and the end of the lead cylinder 10a after loading Are united together. Thereafter, the lead portions a and a (see FIG. 3 (c)) protruding from the steel plates 3 and 3 at both ends of the laminated elastic body 2 are scraped off and finished to a flat surface, and the steel plates at both ends of the laminated elastic body 2 are finished. The seismic isolation device 1 is completed by fixing the mounting plates 6 and 6 to the third and third portions with bolts or the like (see FIG. 1).
[0022]
In the seismic isolation device 1 thus obtained, the columnar lead 10 loaded in the hollow portion 5 of the laminated elastic body 2 that forms the main body has an inner peripheral surface of the hollow portion 5 as shown in FIG. Correspondingly in all parts corresponding to the unevenness to be formed, the hollow portion 5 is loaded without any gap between them. Therefore, even when a horizontal vibration force acts on the laminated elastic body 2 and the lateral fluctuation repeatedly occurs, a gap is generated particularly between the peripheral surface portion of the hole 4 'of the elastic plate 4 and the cylindrical lead 10. As a result, the laminated elastic body 2 can support the vertical load and buffer the horizontal vibration force, and the damper effect of the cylindrical lead 10 can be obtained as it is, and the combined effect of the isolator and the damper is fully achieved. It can be a seismic isolation device that can be used. Further, as described above, the cylindrical lead 10 (lead damper) can be surely incorporated into the laminated elastic body 2 by simple processing, so that the construction cost can be reduced and the economy can be improved. is there.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a specific example of a seismic isolation device obtained by the manufacturing method of the present invention.
FIG. 2 is a diagram for explaining the manufacturing process of the seismic isolation device of the present invention, in which (a) shows a partially enlarged state of obtaining a laminated elastic body, and (b) shows laminated elasticity. A mode in which a lead pipe is mounted in the hollow part of the body, (c) is a process of sealing and fixing the lead pipe mounted in the hollow part of the laminated elastic body, and (d) is obtained. Sections of the fixing intermediate body between the laminated elastic body and the lead pipe body are shown.
FIGS. 3A and 3B are diagrams for explaining the manufacturing process of the seismic isolation device of the present invention, wherein FIG. 3A is a mode in which the inner surface of a lead pipe deformed by pressurization is smoothed, and FIG. (C) is sectional drawing showing the state which loaded the lead cylinder in the hollow part of a lamination | stacking elastic body, and the aspect which fits a lead cylinder in the made lead pipe body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Laminated elastic body 3 Steel plate 3 'which comprises laminated elastic body 4 Hole of steel plate 4 Elastic plate 4' which comprises laminated elastic body Hole 5 of elastic plate 6 Hollow part of laminated elastic body 6 Mounting plate 10 Columnar lead 10a Lead cylindrical body 10a 'combined with lead tubular body outer peripheral surface 11 of lead cylindrical body Lead tubular body 11a Tube inner peripheral surface 12 Lead flange 13 Blind flange

Claims (3)

In manufacturing a seismic isolation device formed by inserting cylindrical lead into the hollow portion of the laminated elastic body,
a) A lead tube is inserted into the hollow portion of the laminated elastic body, and flanges are welded to both ends of the lead tubular body, and fixed to the laminated elastic body,
b) Applying a closing plate to each of the flanges on both sides to make the lead tubular body fitted and fixed to the laminated elastic body airtight;
c) A pressure fluid is allowed to flow into the airtight lead pipe, the lead pipe is expanded and deformed, and is closely fixed to the inner peripheral surface of the hollow elastic body,
d) Processing is performed so that the inner surface of the lead tubular body that is closely fixed to the inner peripheral surface of the hollow portion of the laminated elastic body is smooth,
e) A lead cylinder having an outer diameter that matches the inner diameter is inserted into the lead pipe body, and both ends are welded to the upper and lower surfaces of the fixed lead portion to form a cylindrical lead integrally.
The manufacturing method of the seismic isolation apparatus characterized by the above-mentioned.   The seismic isolation system according to claim 1, wherein the lead cylindrical body to be inserted into a lead tube closely fixed to the inner peripheral surface of the hollow portion of the laminated elastic body has a tapered outer shape. Device manufacturing method. The laminated elastic body is formed by alternately combining a rigid material layer having a hole in the center and an elastic material layer having a hole having an inner diameter larger than the inner diameter of the rigid material layer, so that irregularities are formed on the inner peripheral surface of the hollow portion. When the pressure fluid is allowed to flow into the lead pipe body, the outer peripheral portion of the lead pipe body is swelled along the irregularities so that the lead pipe body is the inner peripheral surface of the hollow elastic body of the laminated elastic body. The method for manufacturing a seismic isolation device according to claim 1, which is fixed firmly to the base.

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