JPS6375232A - Earthquake damping apparatus - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seismic isolation device for preventing seismic force from being transmitted to equipment, structures, etc., and in particular has both a seismic isolation effect and a damping effect. This invention relates to an improved seismic isolation device.

[Prior Art] A structure (seismic isolation rubber) in which a plurality of steel plates and rubber plates are alternately laminated has recently been attracting attention as a support member that satisfies vibration isolation properties during underground clouds.

When such seismic isolation rubber is interposed between a rigid building such as concrete and the foundation foundation, it is soft in the lateral direction, that is, has a small shear rigidity, so it can change the natural period of the building from the earthquake period. It has a shifting effect, and the acceleration that the building receives due to 1iH becomes extremely small.

A major feature of this type of seismic isolation rubber is that it undergoes elastic deformation to return to its original position after being deformed due to geological factors.Moreover, in order to minimize the sinking of buildings due to the creep phenomenon of the seismic isolation rubber, Furthermore, the energy absorption capacity (damping effect) of the seismic isolation rubber itself is extremely small. For this reason, conventionally, the π-free rubber is made of 4R using a rubber material with small hysteresis loss.

However, with such a seismic isolation system that uses only low-attenuation seismic isolation rubber, the slow lateral sway of the building during an earthquake remains for a long time even after the earthquake subsides, so if the amount of lateral sway is large, In addition to damage caused by seismic isolation rubber earthquakes,
There is a risk of collision between the building and other structures and destruction of equipment such as wood pipes, gas pipes, and wiring.

Therefore, conventionally, in order to reduce this rolling displacement as quickly as possible, a method has been used in conjunction with a plastic damper made of soft metal that deforms plastically immediately when an earthquake force is applied. .

For example, by hollowing out the inside of seismic isolation rubber and embedding lead in this part, and using plastic deformation during an earthquake to impart a damping effect to the seismic isolation rubber, it can have both a seismic isolation effect and a damper (damping effect). It is proposed that the

[Problems to be solved by the invention] However, in such a seismic isolation device, although the seismic energy absorption function is increased, a new co-π phenomenon due to the high elasticity of the plastic damper occurs in the high frequency region. appears in

In addition, with lead-containing seismic isolation rubber, when the seismic isolation rubber is greatly deformed during a major earthquake, the hard steel plate will damage the lead, and the damaged lead will further damage the rubber and other soft plates. easily cause rupture.

Furthermore, damaged lead easily breaks due to repeated large deformations.

[Means for Solving the Problems] The present invention solves the above conventional problems and provides an improved seismic isolation device that has both a seismic isolation effect and a damping effect. The gist of the invention is a seismic isolation device characterized by a seismic isolation device in which a seismic isolation rubber made by alternately laminating hard plates having viscoelastic properties and soft plates having viscoelastic properties, and a damper made of plastic are provided in parallel. It is something to do.

[Function] In the present invention, the plastic constituting the damper is
It has an extremely large damping effect. Moreover, a seismic isolation rubber made by laminating a plurality of hard plates and soft plates alternately has an excellent seismic isolation effect and damping effect.

Therefore, according to the seismic isolation device of the present invention in which such a plastic damper and seismic isolation rubber are arranged in parallel, the shaking transmitted to the building is alleviated, and the building can be supported stably and reliably for a long period of time. Become.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are longitudinal sectional views each showing a seismic isolation device according to an embodiment of the present invention.

As shown in FIG. 1, the seismic isolation device of the present invention includes a plurality of rigid plates 11 and a soft plate 12 having viscoelastic properties.
A seismic isolation rubber 1 made by alternately pasting together and a damper 2 made of plastic are provided in parallel. In the figure, numerals 13 to 16 are flanges, 20 is a building, and 30 is a foundation.

In the seismic isolation device of the present invention, the damper 2 may have any shape as long as the energy loss during shearing or bending deformation can be effectively utilized as a damping effect, and the shape is not restricted in any way. A columnar body is suitable for this.

Furthermore, in the present invention, the plastic damper 2 is used in combination with the seismic isolation rubber 1, and the arrangement of both is as shown in FIG. It may be arranged in parallel between the second
As shown in the figure, a cylindrical space is created by hollowing out the center of the seismic isolation rubber 1, and a plastic damper 2 is placed inside this space.
It is also possible to enclose the following. (In Fig. 2, the same members as in Fig. 1 are indicated by the same symbols, and their explanations are omitted.) In addition, the number of seismic isolation rubbers 1 and dampers 2 arranged in the seismic isolation device shown in Fig. 1 The ratio, the spacing, the cross-sectional area ratio between the seismic isolation rubber 1 and the damper 2 in the seismic isolation device shown in FIG. 2, etc. are appropriately selected depending on the purpose of use of the pi isolation device.

Below, each structure of the seismic isolation rubber 1 and the damper 2 is demonstrated.

The plastic constituting the damper of the present invention is preferably one that satisfies the following physical properties (1) to (4) from the viewpoint of its damping effect.

■ Elastic modulus (longitudinal modulus) at 25°C is 1 to 10'
kg/mrn', more preferably 1-5X1o2kg/
■ Elongation at break at 25°C is 50% or more, more preferably 70% or more ■ Hysteresis ratio at 50% tensile deformation at 25°C (h5
0) is 0.3 or more, more preferably 0.4 or more In the present invention, the plastic of the damper material includes polystyrene, polyethylene, polypropylene, AB
S, polyvinyl chloride, polymethyl methacrylate, polycarbonate, polyacetal, nylon, chlorinated polyether, polytetrafluoroethylene, polyfluorinated-chlorinated ethylene, polyfluorinated ethylene propylene, acetyl cellulose, ethyl cellulose, polyvinylidene, vinyl butyral, polypropylene Thermoplastic resins such as oxando, rubber modified products of these resins, and plasticizers for these resins such as phthalic acid, isophthalic acid, adipic acid, tetrahydrophthalic acid, sebacic acid, azelaic acid, maleic acid, fumaric acid, trimellitic acid, citric acid, itaconic acid, oleic acid, ricinoleic acid, stearic acid, phosphoric acid,
Effective are various acid derivatives such as sulfonic acid; glycol, glycerin, paraffin, epoxy fffl conductors, etc. added thereto.

Furthermore, thermosetting resins such as epoxy resins and unsaturated polyesters, rubber modified products thereof, and/or the above-mentioned various plasticizer additives may also be used.

Even if these plastics are used alone, 2f! 1
You may use a blend of i or more. Further, if necessary, general compounding agents such as various fillers, tackifiers, lubricants, anti-aging agents, softeners, and low molecular weight polymer oils may be mixed.

In order to improve the weather resistance of such a plastic damper, different substances such as various protective agents may be applied to the exposed surface of the plastic damper.

On the other hand, the material of the hard plate 11 of the seismic isolation rubber 1 is metal,
Ceramics, plastics, FRP, polyurethane, wood, paperboard, slate board, decorative board, etc. can be used. Further, as the soft board 12, various materials such as various vulcanized rubbers, unvulcanized rubbers, organic materials such as Plus Deck, foams of these materials, inorganic materials such as asphalt and clay, and mixed materials thereof can be used. can. The shapes of these hard plates 11 and soft plates 12 may be circular, square, etc.
It may also be a polygon such as a pentagon or a hexagon.

Further, the seismic isolation rubber 1 can also be improved by coating the outer surface with a rubber material having excellent weather resistance in order to improve its weather resistance.

In this case, the coating rubber material is preferably a rubbery polymer with excellent weather resistance, such as butyl rubber, acrylic rubber, polyurethane, silicone rubber, fluororubber, polysulfide rubber, ethylene propylene rubber (ERP and EPDM).
), Hypalon, chlorinated polyethylene, ethylene vinyl acetate rubber, epichlorohydrin rubber, chloroprene rubber, etc. Among these, butyl rubber, polyurethane, ethylene propylene rubber, Hypalon, chlorinated polyethylene, ethylene vinyl acetate rubber, and chloroprene rubber are particularly effective in terms of weather resistance. Furthermore, in consideration of adhesion to the rubber constituting the soft plate, butyl rubber, ethylene propylene rubber, and chloroprene rubber are preferable, with ethylene propylene rubber being most preferable.

These rubber materials may be used alone or in combination of two or more. Further, in order to improve elongation and other physical properties, it may be blended with commercially available rubbers such as natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, etc. Furthermore, these rubber materials may be mixed with compounding agents commonly used in rubber materials, such as various fillers, anti-aging agents, plasticizers, softeners, oils, and the like.

In order to manufacture such a seismic isolation device of the present invention, first, hard plates and soft plates are alternately laminated and bonded using an adhesive or co-vulcanization to produce seismic isolation rubber.

Further, a damper 2 is manufactured by molding plastic using a conventional method, and is placed in parallel with the seismic isolation rubber 1 to form a seismic isolation device as shown in FIG.

On the other hand, in order to manufacture the seismic isolation device shown in FIG. A method is adopted in which a hard plate with a hollowed out center and a soft plate material are inserted alternately into the material and then co-vulcanized.

[Effects of the Invention] Since the seismic isolation device of the present invention has a damper effect as well as a seismic isolation effect, shaking when an earthquake occurs is absorbed by the seismic isolation structure, reducing the degree of shaking transmitted to the building. be done. Therefore, even in the event of a major earthquake, collisions between buildings and other structures and equipment such as wood pipes, gas pipes, and wiring are prevented from being destroyed.

In addition to the seismic isolation effect, the seismic isolation device of the present invention can also be fully expected to have excellent effects such as vibration isolation (vibration isolation, vibration suppression).

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a vertical cross-sectional view showing a seismic isolation device according to one embodiment of the present invention, and Fig. 2 is a longitudinal cross-sectional view showing a seismic isolation device according to another embodiment of the present invention. be. 1... Seismic isolation rubber, 2... Damper, 11
...Hard board, 12...Soft board, 13.1
4.15.16...Flange.

Claims (2)

[Claims] (1) Seismic isolation rubber made by alternately laminating a plurality of hard plates with rigidity and soft plates with viscoelastic properties, and a damper made of plastic are installed in parallel. Seismic isolation device. (2) The seismic isolation device according to claim 1, wherein the plastic satisfies the following [1] to [3]. [1] Elastic modulus (longitudinal elastic modulus) at 25°C is 1 to 10
^3kg/mm^2 [2] Elongation at break at 25℃ is 50% or more [3] Hysteresis ratio (h) at 50% tensile deformation at 25℃
_5_0) is 0.3 or more