JPH0213181B2 - - Google Patents

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

Conventionally, a patent application No. 52 of the Showa era has been published which uses a vibration-proof installation member using vibration-proof rubber, and uses a stopper to limit excessive horizontal and vertical displacement in the event of an earthquake, thereby preventing the vibration-proof rubber from being destroyed.
No. 77867, an elastic body (vibration-proof rubber) is built in between the upper metal fitting and the lower metal fitting, and a mutual locking piece of the upper metal fitting and the lower metal fitting prevents the vibration-proof rubber from being cut and destroyed; Even if the anti-vibration rubber were to break, the locking pieces would lock into each other and prevent them from coming off, thereby preventing the installed equipment from falling or moving. There is No. 50-103046 of the Showa era. However, with these conventional earthquake-resistant or anti-vibration 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, it was necessary to separately add other mechanisms such as a horizontal maintenance mechanism and a fall prevention mechanism.

In order to solve 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 engageable concave and convex portions, and the built-in elastic body has a cylindrical shape so as to cause nonlinear deformation with a very small amount of deflection. It has a continuous integral shape of a truncated cone, and has a structure that allows these three 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, thereby 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 uses natural vulcanized rubber or synthetic rubber, such as neoprene, between the upper hardware 1 and the lower hardware 2.
It incorporates an elastic body 3 made of urethane or the like that deforms nonlinearly (hereinafter referred to as a nonlinear elastic body). That is, the upper hardware 1 has a pedestal part 4 for installing equipment and a mounting hole 6a for installing the equipment, and protrudes inward from the pedestal part 4 at an appropriate distance. Multiple pieces (in this example, 4 pieces)
It has two protruding parts 5, and a protruding part 14 for positioning the elastic body on the inner surface of the pedestal part 4.

The lower hardware 2 has a bottom plate part 6 for installation on the floor, and a flange 8 projecting outward from the 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. Further, an elastic body (rubber in the embodiment) 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 flange portion 8a of the lower metal fitting 2. The tip of the protrusion 5,
A gap of 0.5 to 1.0 mm is provided to absorb shock in the horizontal direction and to almost contact the top surface of the protrusion 5 of the upper metal fitting 1 to prevent the upper and lower metal fittings from directly touching each other during vertical vibration. It is possible. Further, a portion of the bottom plate 6 has at least one hole 10 for attaching an anchor bolt, and an annular protrusion 15 for preventing displacement of the elastic body is provided on the inner surface of the bottom plate 6.

The nonlinear rubber 3 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 projection 11 on the top surface and the tapered cylindrical shape on the top side surface control the bending to be non-linear.

In this embodiment, the protrusion on the top surface is an annular protrusion, but it is not limited to an annular protrusion, and it goes without saying that other shapes such as step-like protrusions may also be discontinuous and cause non-linear deflection. stomach.

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, the non-linear elastic body 3 is installed in the center of the lower hardware 2, the protrusion 5 of the upper hardware 1 is fitted into the recess 8b of the lower hardware 2, and then the upper hardware 1 and the lower hardware 2 are moved relative to each other. By rotating it by 1/4 and positioning the protruding portion 5 and the flange convex portion 8a in a position where they overlap, an assembly as shown in FIG. 1 can be obtained.

In the present invention, the nonlinear elastic body is used in order to keep the vertical dimension change, that is, the levelness, as constant as possible in response to changes in the load of equipment and unevenness of the floor. In other words, the pedestal section 4 may deform in the vertical direction due to differences in load points such as the center of gravity of the equipment.
This is to minimize the degree of deformation.
The same thing can be said about uneven floors. This is effective for keeping the level as constant as possible when installing equipment without adding other mechanisms such as a leveling mechanism or overturning prevention mechanism.

The load-deflection diagram in FIG. 5 was derived experimentally. As can be seen from this figure, when the same load W is applied, when comparing the amount of deflection a of the linear elastic body A and the amount of deflection b of the nonlinear elastic body B, a>b,
Nonlinear elastic body B has a smaller amount of deformation.

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 frame 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 f ₀ 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 λ=1/|1−(f/f ₀ ) ² It is expressed as |×100 (%).

Since the frequency f of a packaged air conditioner, which is one type of air conditioner in this embodiment, is generally 24 Hz, the vibration transmissibility λ=16%.

For floors where vibration must be minimized, a vibration isolator with a small natural frequency, such as a spring or a composite elastic body of spring and rubber, is used to further reduce the vibration transmission rate. Of course, it can be incorporated. 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 a situation may arise in which nonlinear elastic bodies alone cannot absorb vibrations. In this case, the present invention has a structure in which the upper metal fitting 1 and the lower metal fitting 2 engage with each other to function as a stopper, so that the effects of preventing sideslip and falling can be fully exhibited. Figure 6a is a seismic characteristic curve diagram, with shear strength on the horizontal axis and tensile strength on the vertical axis, and Figure 7 is a vibration isolation characteristic curve diagram, with frequency on the horizontal axis and effect on the vertical axis. The amount (response magnification) was calculated.

In FIG. 6b, the relationship between vertical force T and horizontal force Q is experimentally determined when air conditioning equipment as an experimental structure is set in earthquake-resistant metal fittings.

The vertical pull-out force and shear force of commonly used air conditioning equipment in the case of a seismic intensity of 1.5G are plotted with circles in the figure, as calculated using a design formula based on the seismic design and construction guidelines for building equipment under the guidance of the Ministry of Construction. This is a diagram that shows values that far exceed these values and proves the seismic effect. Moreover, in FIG. 7, an air conditioner as an experimental structure was set in an earthquake-resistant metal fitting, and the vibration isolation effect was determined experimentally.

An effect level of 30 dB was obtained at a frequency of 30 Hz or higher, indicating excellent vibration-proofing effects.

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

As mentioned above, the earthquake-resistant/vibration-proof installation member of the present invention connects the upper hardware and the lower hardware 2 via the nonlinear elastic body.
The upper metal fittings, the lower metal fittings, and the nonlinear elastic body are combined in such a way that they can be engaged in both vertical and horizontal directions. , it is possible to prevent vibrations in the vertical direction, and it is also possible to prevent equipment from moving or falling in the event of an earthquake.

[Brief explanation of drawings]

Fig. 1 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 6A is a load-deflection diagram of a linear elastic body and a nonlinear elastic body, FIG. 6A is a seismic characteristic curve, FIG. 6B is a diagram when a force is applied, and FIG. 7 is a 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: Projection part, 1
4: Annular projection part, 6: Bottom plate part, 7: Cylindrical part, 8:
Flange portion, 8b: Fittable recess, 8a: Engageable convex portion, 9: Elastic body, 10: Anchor bolt mounting hole, 11, 15: Annular protrusion, 12: Hollow portion 1, 13: Right angle portion, a: amount of deflection of linear elastic body A,
b: Deflection amount of nonlinear elastic body B.

Claims (1)

[Claims] 1. In an earthquake-resistant/vibration-proof installation member that has an elastic body built in between the upper hardware and the lower hardware, the inner part is installed at an appropriate distance from the downward cylindrical wall provided in the pedestal section that has at least one equipment mounting hole. an upper metal fitting having a plurality of protrusions projecting in the direction; and an upward cylindrical part provided in the bottom plate having at least one anchor bolt mounting hole, the upper metal fitting protruding outward; a lower hardware having a flange portion having a concave portion into which the portion can be fitted and a convex portion into which the protrusion portion can be engaged; and an elastic body that is interposed between the upper metal fitting and the lower metal fitting, has a cylindrical shape on the lower side, a hollow truncated cone on the upper side, and has a protrusion on the upper surface and is capable of non-linear deformation, The earthquake-resistant device is characterized in that the elastic body that deforms non-linearly is positioned and held by positioning protrusions provided on opposing surfaces of the inner surfaces of the upper metal fitting and the lower metal fitting, respectively.
Anti-vibration installation parts.