JPS6014629A - Earthquake-resistant and vibration-isolating mount member - Google Patents

Abstract

PURPOSE:To provide both functions of earthquake-resistant and vibration-isolation, by interposing an elastic member consisting of a cylindrical lower portion and a hollow frusto-conical upper portion between an upper hardware provided with a projection for positioning the elastic member and a lower hardware provided with a projection for preventing slippage of the elastic member. CONSTITUTION:An upper hardware 1 inclueds a mount portion 4 and a mount hole 6a for equipments, and is provided with a plurality of projections 5 projecting from the mount portion 4. The upper hardware 1 is further provided with a projection 14 for positioning an elastic member on an inner surface thereof. A lower hardware 2 includes a bottom plate portion 6 and a flange portion 8 projecting from a cylindrical portion 7. The flange portion 8 is formed with recesses 8b and projections 8a engageable with the projections 5 of the upper hardware 1. An elastic member 3 is provided with an annular projection 11 on an upper surface thereof, and a hollow portion 12 inside thereof, and is cylindrical on the lower side, while being hollow frusto-conical on the upper side, so as to generate unlinear deflection.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earthquake-resistant/vibration-proof installation member used for installing equipment.

In detail, after installing equipment such as packaged air conditioners, we prevent the vibrations caused by the operation of the air conditioners from being transmitted to the building, and also prevent disasters by reliably preventing the air conditioners from moving or falling in the event of an earthquake. The present invention relates to an earthquake-resistant/vibration-proof installation member that is both earthquake-resistant and vibration-proof.

Conventionally, with anti-vibration installation members using anti-vibration rubber, excessive horizontal and vertical displacement is limited by a stopper in the event of an earthquake, preventing damage to the anti-vibration rubber. Built-in elastic body (vibration-proof rubber) between the hardware,
Further, the mutual locking pieces of the upper metal fitting and the lower metal fitting prevent the vibration isolating rubber from being cut and destroyed, and even if the vibration isolating rubber should be cut, the locking pieces will lock each other and both of them will be secured. There is Japanese Patent Application Laid-open No. 50-105046, etc., which states that it is possible to prevent the installed equipment from overturning or moving because it is possible to prevent the equipment from being pulled out. However, with these conventional earthquake-resistant or anti-seismic stands, when different loads are applied to different parts of the stand, the elastic body deforms in a nearly linear manner, making it impossible to maintain the horizontal position of the stand. In order to prevent the equipment from moving or falling over, it was necessary to separately add other equipment such as a horizontal maintenance mechanism or an overturn prevention mechanism.

In order to resolve the above-mentioned problems, the present invention provides an earthquake-resistant/vibration-proof installation member that has both earthquake-resistant and vibration-proof functions with a simple assembly structure that incorporates an elastic body that deforms non-linearly. .

In order to achieve the object of the present invention, the upper metal fitting and the lower metal fitting each have a plurality of retainable uneven parts, and the built-in elastic body has a cylindrical shape so that the elastic body can be deformed in a non-linear manner with a very small amount of deflection. It has a continuous integral shape of a truncated cone, and has a structure that allows these five members to be easily combined. Further, the upper surface of the elastic body has a protrusion for preventing displacement. Furthermore,
A plate-shaped elastic body is attached to the outer circumferential surface of the lower metal fitting, making it possible to cushion horizontal shocks and absorb vertical vibrations.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, the earthquake-resistant/vibration-proof installation member of the present invention has a nonlinear material made of natural vulcanized rubber or synthetic rubber, such as neorene, urethane, etc., between the upper metal fitting 1 and the lower metal fitting 2. Elastic body that deforms (hereinafter referred to as nonlinear elastic body) 3
It has a built-in That is, the upper hardware 1 is
Frame section 4 for installing equipment and mounting holes 6 for equipment
a'l, and a plurality of (four in this embodiment) protrusions 5 protruding inward from the pedestal part 4 at appropriate intervals, and the pedestal part 4. 4 has a projection 14 for positioning the elastic body.

The lower hardware 2 has a bottom plate part 6 for installation on a floor surface, and a flange 8 projecting outward from a cylindrical part 7 at an appropriate distance from the bottom plate part 6. A concave portion 8b into which the protruding portion 5 of the upper hardware 1 can fit and a convex portion 8a into which the protruding portion 5 can engage are formed in a planar manner at 8. Further, an elastic body (rubber in the embodiment) 9 having a thickness of 8 mm or less, preferably 3 mm or less, is attached to the outer peripheral surface of the cylindrical portion 7 and the protruding 7-rank portion 8a of the lower metal fitting 2. A gap of Q5 to 1.0 is provided between the tip of the protruding part 5 of the hardware 1 to absorb horizontal shock and to almost contact the top surface of the protruding part 5 of the upper hardware 1, so that it can be easily contacted with the top surface of the protruding part 5 of the upper hardware 1 during vertical vibration. This makes it possible to absorb vibrations so that the upper and lower hardware do not come into direct contact with each other. Further, a part of the bottom plate part 6 has at least one hole 10 for attaching an anchor bolt,
Furthermore, an annular protrusion 15 is provided on the inner surface of the bottom plate 6 to prevent displacement of the elastic body.

The nonlinear rubber 5 has an annular projection 11 on its upper surface and a hollow portion 12 inside, and has a cylindrical shape on the lower side and a hollow truncated cone shape on the upper side. The annular protrusion 11 on the top surface and the cylindrical shape continuing from the tenon on the upper side surface are controlled to provide non-linear deflection.

In this example, the protrusion on the top surface is an annular protrusion, but
Needless to say, it is not necessary to limit the shape to an annular projection, and even if the shape is discontinuous, such as a step-like projection, non-linear deflection can be caused.

The bottom surface of the nonlinear elastic body 3 and the intersecting surface 13 of the hollow portion 12 are made at right angles to facilitate positioning.

To assemble, place the nonlinear elastic body 3 in the center of the lower hardware 2.
After fitting the protrusion 5 of the upper hardware 1 into the recess 8b of the lower hardware 2, the upper hardware 1 and the lower hardware 2 are rotated one rotation relative to each other, so that the protrusion 5 and the flange convex portion 8a overlap. Depending on the position, an assembly as shown in FIG. 1 can be obtained.

In the present invention, all nonlinear elastic bodies are used in order to keep vertical dimensional changes and swells as constant as possible in response to changes in the load of equipment and unevenness of the floor. That is, the pedestal section 4 is deformed in the vertical direction due to the difference in the load points such as the center of gravity of the equipment, in order to minimize the degree of deformation.

The same thing can be said about uneven floors. and,
This is effective when installing equipment to keep the level as constant as possible without adding other mechanisms such as a leveling mechanism or overturn prevention mechanism.

The load-deflection diagram in FIG. 5 was derived experimentally. As shown in this figure, when the same load W is turned on,
Comparing the amount of deflection a of the linear elastic body A and the amount of deflection of the nonlinear elastic body B, it is a) b, and the amount of deformation of jli linear elastic body is small.

This applies regardless of whether the equipment is installed directly on the earthquake-resistant/vibration-proof installation member of the present invention or when a pedestal is fixed to the installation member and the equipment is installed on it. This means that the levelness of equipment can be kept almost constant.

The vibration reduction effect of installed equipment such as air conditioning equipment is greatly influenced by the natural frequency of the mounted vibration isolator. The natural frequency fo of the nonlinear elastic body according to the present invention is around 9 Hz, and if the excitation frequency of the air conditioner is f, the vibration transmissibility λ is as follows: λ=xlooo(%) 11-(f/fo )” 1.

The frequency f of the package air conditioner, which is one type of air conditioner in this embodiment, is generally 24) Lz, so the vibration transmissibility λ is
= 16chi.

For floors where it is necessary to minimize vibration, a vibration isolator with a small natural frequency, such as a spring or a composite elastic body of a spring and rubber, is used to further reduce the vibration transmission rate. Of course, it can be incorporated as Note that this spring or a composite elastic body of spring and rubber must have an extremely nonlinear load-deflection line.

The above has mainly explained the seismic and vibration-proofing effects of equipment in the vertical direction, but in the case of an earthquake, a considerable horizontal force is applied, so nonlinear elastic bodies alone may not be able to absorb the vibrations. In this case, the present invention has a structure in which the upper metal fitting 1 and the lower metal fitting 2 are engaged and serve as a stopper, so that the effect of preventing the bevel from lying sideways and preventing it from falling can be sufficiently exhibited. . Figure 6 (&) is a seismic characteristic curve diagram, with shear strength on the horizontal axis and tensile strength on the vertical axis. Figure 7 is a vibration isolation characteristic curve diagram, with frequency on the horizontal axis and vertical axis. The axis shows the effect size (response magnification).

In FIG. 6(b), the relationship t between the vertical force T and the horizontal force Q when the air conditioner as an experimental structure is set in an earthquake-resistant metal fitting is determined experimentally.

The vertical pull-out force and shearing force of commonly used air conditioning equipment in the case of a seismic intensity of 1.5G calculated using a design formula based on the seismic design and construction guidelines for building equipment under the guidance of the Ministry of Construction are plotted as circles in the same figure. However, this diagram shows values that are far higher than these and proves the earthquake resistance effect. In addition, in Figure 7, the air conditioning equipment used as the remains of the actual defeat was set in earthquake-resistant metal fittings, and the vibration-proofing effect was experimentally determined.

An effect level of 50 dB was obtained at frequencies above s o nz, and the vibration-proofing effect shows excellent results.

Note that the upper hardware 1 and the lower hardware 2 are manufactured from ferrous materials such as gray cast iron, ductile cast iron, and vermicular cast iron, or from vA castings or non-ferrous castings such as aluminum alloys and copper alloys, but may be made of iron, steel, or non-ferrous materials. It may also be manufactured by welding a wrought material.

As mentioned above, the earthquake-resistant/vibration-proof installation member of the present invention.

Since the upper hardware and the lower hardware are combined so that they can be fixed both vertically and horizontally via a nonlinear elastic body, the upper hardware, lower hardware, and By determining the dimensions and shape of the nonlinear elastic body, it is possible to completely prevent vibrations in the vertical direction, and also to completely prevent equipment from moving or falling in the event of an earthquake.

[Brief explanation of the drawing]

Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 2 is a bottom view of the upper metal fitting, Fig. 3 is a plan view of the lower metal fitting, Fig. 4 is a sectional view of the nonlinear elastic body, and Fig. 5 is a load-deflection diagram of a linear elastic body and a nonlinear elastic body, and Figure 6 (,) is an earthquake resistance characteristic curve.
FIG. 6(b) is a diagram when force is applied, and FIG. 7 is a diagram of the vibration isolation characteristic curve. The symbols in the drawings are as follows. 1: Upper hardware, 2: Lower hardware, 3: Nonlinear elastic body, 4:
Frame part, 6a: Mounting hole, 5: Protrusion part, 14: Annular protrusion part, 6: Bottom plate part, 7: Cylindrical part, 8: 7 rank part, 8b: Recessed part that can be inserted, 8a: Convex part that can be fitted , 9: Elastic body, 1
0: Anchor bolt mounting hole, 11.15: Annular protrusion,
12: Hollow part, 13: Right angle part, a = Deflection amount of IIJ type elastic body A, b Deflection amount of two nonlinear elastic body B Continued from page 1 0 Inventor Toshio Akamatsu 2 Motoakasaka-chome, Minato-ku, Tokyo No. 7 Kajima Construction Co., Ltd. 0 applicants Kajima Construction Co., Ltd. 1-2-7 Motoakasaka, Minato-ku, Tokyo

Claims (1)

[Claims] In an earthquake-resistant installation member incorporating an elastic body between an upper metal fitting and a lower metal fitting, there is at least one anchor bolt mounting hole, at least one frame mounting bolt hole, and at the center of the upper inner surface, a hole for positioning the elastic body. An upper metal fitting with a protrusion having a protrusion, at least one hole for attaching an anchor bolt on the bottom, a plate-shaped elastic body attached to the outer peripheral surface, and a protrusion for preventing displacement of the elastic body at the center of the inner surface of the bottom. An earthquake-resistant φ vibration-proof installation member comprising three members: a lower metal fitting with a flange, and the elastic body having a cylindrical shape on the lower side, a hollow truncated cone on the upper side, and a protrusion on the upper surface. .