JPS60250143A - Earthquake-dampening apparatus of heavy article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a seismic isolation device for heavy objects that reduces acceleration input from a heavy object foundation to the heavy object due to seismic motion.

[Background Art] One of the seismic isolation methods is the insulation method. This insulation method insulates (decouples) the heavy object from the foundation of the heavy object, that is, covers it so that it is not fixed.A soft spring or roller is placed between them so that the movement of the foundation of the heavy object is controlled by the weight. This prevents it from being transmitted directly to objects.

Specific examples of this insulation method include those using ball bearings with a sliding function and those using laminated rubber.

[Problem in the background art 1 Among the above conventional technologies, those using ball bearings have the advantage of not being bulky, but their contact area is small, so their load supporting capacity is low, and they are difficult to resist vibration input. The problem is that the displacement is large.

On the other hand, those using laminated rubber can support heavy objects, but in that case, the width of the laminated rubber becomes wider and the bulk becomes higher, so there is a problem that the overall shape becomes larger. Among these, to solve the problem of widening, it is possible to install a large number of small-width laminated rubber, but this creates a new problem of complicating the manufacturing and installation work, and is bulky. The problem of high prices has not been resolved. In addition, products using laminated rubber deform while supporting the load during seismic motion, resulting in harsh usage conditions and poor durability.

[Object of the Invention] The present invention has been made by focusing on the problems of the prior art described above, and has a high load-bearing capacity and an excellent restoring effect, and the overall shape of the device including width and bulk is relatively small. The purpose is to provide a small seismic isolation device.

[Summary of the Invention] The present invention provides a bearing plate having a flat portion and a curved portion between a heavy equipment fixed to a heavy object and a base side joint fixed to a foundation of the heavy object, A cylindrical rubber spring that seals this bearing plate was removed.

[Embodiments of the invention] FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

In this embodiment C, a bearing plate 30 is provided between the upper shoe 10 and the lower shoe 20, and this bearing plate 3
A cylindrical rubber spring 40 is provided to seal 0.

The bottom surface 11 of the upper shoe 10 comes into contact with the upper surface of the bearing plate 30 and exhibits a sliding function. Further, the upper shoe 10 is provided with a plurality of through holes 12, through which bolts 13 are inserted and screwed into bolt holes 41a of the steel 41 in the rubber spring 40.

A recess 21 is provided on the upper surface of the lower shoe 20, and the recess 21
The curved surface portion of the bearing plate 30 comes into contact with the top of the bearing plate 30 . The lower shoe 20 is provided with a plurality of through holes 22, through which the bolts 23 are inserted and screwed into bolt holes 42a of the steel 42 in the rubber spring 40.

In addition, in the right side part of FIG. 1, the through holes 12, 22, bolts 13, 23, bolt holes 41
a and 42a exist, but their display is omitted.

The rubber spring 40 seals the bearing brake h30 and has a cylindrical shape. This cylindrical shape may be round or square. And rubber splash 40
A ring-shaped steel 41 is embedded near the upper end, and a ring-shaped steel 42 is also embedded near the lower end.

r, i on the top of the steel 41 and the bottom of the steel 42
, S spacer portions 41S and 42S made of rubber of s thickness are provided, and these spacer portions 418 and 42S are integrated with the inner portion of the rubber spring 40. These spacer portions 41s and 42s are in contact with the lower surface of the upper shoe 10 and the upper surface of the lower shoe 20, respectively.

Note that the heavy object A shown by the two-dot chain line is an object that is integrated with the upper shoe 1o, and the heavy object base B is an object C that is integrated with the lower shoe 20.

FIG. 2 is a cross-sectional view taken along line II-I in FIG. 1, mainly showing the bottom surface of the upper shoe 10. Also,
FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 1, and mainly shows the plane of the lower shoe 20.

The through hole 10a shown in FIG. 2 is a hole for an anchor bolt to a heavy object, and the through hole 20b shown in FIG. 3 is a hole for an anchor bolt to a foundation B of a heavy object. The upper shoe 10 is fixed to the heavy object A and the lower shoe 20 is fixed to the foundation day using anchor bolts (not shown) through these through holes 10a and 20b.

FIG. 4 is an enlarged perspective view of the bearing plate 30.

The bearing plate 30 is made of metal, has graphite, which is a solid lubricant, adhered to its entire surface, and has a flat portion 31 and a curved portion 32.
A large number of small recesses 33 are provided. In FIG. 4, only a part of the small recess 33 is shown, and other parts are omitted. These small recesses 33 are filled with a sliding material, such as graphite, so that slippage during sliding l! ! It works to reduce friction resistance.

Next, the operation of the above embodiment will be explained.

In FIG. 5, the normal state is shown by a solid line, and the case where an earthquake occurs is shown by a two-dot chain line.

When an earthquake occurs, the vibration load on the lower shoe 20 is first absorbed by the sliding between the bearing plate 30 and the first shoe 10, and then transferred to heavy objects such as transformers, substation equipment, and building structures. The vibration becomes minute, and then the amplitude of the heavy object Δ is reduced by the rubber spring 40.

In this case, the spring coefficient of the restoring force of the rubber spring 40 is set so that the response magnification to earthquake input is small, and its natural period is set to about 2.0 seconds. This natural period is longer than the earthquake period (0.2 to 0.5 seconds), but is determined in relation to the mass of the seismically isolated heavy object A.

Note that the rubber spring 40 seals the sliding space that includes the bearing plate 30, and this is to prevent oxidation in the space and to prevent deterioration of the rubber spring 40 due to ozone entry. It is. Further, the reason why the IC uses the rubber spring 40 to obtain the restoring force is that its damping property is better than that of steel, and the shape is compact. Further, if the rubber spring 40 is circular, it is excellent because it can simultaneously respond to horizontal vibrations from any direction, but it may also be square.

Note that the design conditions of the above device are determined by the combination of the friction coefficient of the sliding member and the spring constant of the restoring force.

The design conditions were determined as follows based on the dynamic response measurement field.

Response magnification 1/2 to 1/3 Maximum response displacement 3 cm, maximum residual displacement 1 cm FIG. 6 is a longitudinal sectional view showing another embodiment C' of the present invention. This embodiment differs in the shape of the bearing plate, etc. In other words, a Teflon plate 36 is fixed to the flat part of the bearing plate 35, and this 7 flon plate 3
A large number of grooves 38 are provided on the groove 6, into which silicone oil 39 (lubricating oil) enters, and silicone oil 37 (ft!) enters the sealed space.
l ffi oil). In addition, through holes 12, 22, bolts 13, 23, and bolt holes 41a, 42 for connecting the upper shoe 10 and the lower shoe 20 to the rubber spring 40 are provided.
Although the symbol a is omitted, it is of course the same as in FIG. 1 in this respect.

FIG. 7 is a plan view of the bearing plate 35, and FIG. 8 is an enlarged longitudinal sectional view of the bearing plate 35.

As shown above, Teflon plate 3 is attached to bearing plate 1/35.
By providing silicone oil 6 and a groove 38, allowing silicone oil to enter the groove 38, and sealing the silicone oil 37 into the sealed space, the friction coefficient of the sliding surface between the upper shoe 10 and the upper shoe 10 is reduced. (0.03-0.05).

In the embodiment described above, the upper shoe 10 is placed on the upper side and the lower shoe 20 is placed on the lower side, but these vertical positions may be reversed. In other words, a heavy object device that is fixed to a heavy object,
It is only necessary to provide a foundation side joint for fixing to the foundation of a heavy object.

In the above case, the upper shoe 10 is installed at the bottom, the lower shoe 20 is installed at the top, and the bearing plate 35 is inserted between them, so that the curved surface 32 of the bearing plate 35 faces upward and the flat part 31 faces downward. placed so as to face. By doing this, the amount of silicone oil 37 used can be reduced.

[Effects of the Invention] As described above, the present invention has a bearing plate 1, so it is supported by metal and has excellent durability, and unlike ball bearings, it does not undergo large displacement due to small vibration input, and moreover, The load supporting capacity of the entire device is high, and the rubber spring that provides the restoring force can be made smaller, so the overall shape of the device, including width and bulk, can be kept relatively small. It can be made smaller (compared to the case of laminated rubber, the volume of the present invention is about 1/3 lower), and almost no load is applied to the rubber spring, so it can effectively exert its restoring force. Furthermore, since the rubber spring has a cylindrical shape that seals the bearing plate, it is effective in preventing the bearing plate from rusting and also preventing the rubber spring itself from deteriorating.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, Fig. 2 is a transverse cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line ■-■ in Fig. 1. 4 is a perspective view showing the bearing plate, FIG. 5 is a diagram showing the normal state with a solid line and an earthquake state with a chain double-dashed line, and FIG. 6 shows an embodiment of the present invention. 7 is a plan view of the bearing plate in FIG. 6, FIG. 8 is a partially cutaway longitudinal sectional view of FIG. 7, and FIG. 9 is an overall view showing the state of use of the device of the present invention. be. 10... Upper shoe as a heavy equipment, 20... Lower shoe as a foundation side fitting, 30... Bearing grate, 31
...Flat portion, 32...Curved surface portion, 40...Rubber spring, 35...Bearing plate. Figure 1 1'212 22 '22 1 Figure 5 Figure 6

Claims (1)

[Scope of Claims] (1) A heavy object side shoe that is fixed to a heavy object; a foundation side foot that is fixed to the foundation of the heavy object: a foot provided between the heavy object measurement device and the foundation side shoe; A seismic isolation system for a heavy object O (2, Claim 1 Claim 1, wherein the bearing plate has a load supporting function and a sliding function. <3) Claim 1, wherein the bearing plate has a load supporting function and a sliding function. The flat part is turned upward or downward,
A seismic isolation device for heavy objects, characterized in that the curved part is installed with its curved surface facing downward or upward. (4) A seismic isolation device for a heavy object according to claim 1, wherein the bearing plate has graphite attached to its surface. (5) In claim 1, the bearing plate is provided with a Teflon plate on its surface, a groove is provided on the surface of the Teflon plate, and a lubricating oil is provided in the Teflon plate and the groove. A seismic isolation device for heavy objects. (6) The seismic isolation device for a heavy object according to claim 1, wherein the rubber spring has a ring-shaped steel embedded in the vicinity of an end surface of a cylindrical portion thereof.