JPH0464374B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application>> The present invention relates to a vibration isolation foundation for equipment that generates high-order vibrations, such as transformers and generators.

<<Prior Art>> Conventionally, an elastic material such as rubber or a spring was provided between the foundation and the installed equipment to absorb slight vibrations.

However, this type of vibration isolation means cannot be expected to absorb large vibrations, and there have been cases of resonance.

Therefore, a dynamic damper was attached to the equipment itself.

≪Problems to be solved by the invention≫ However, in both cases, solid-state transmission occurs due to whining noise caused by higher-order mode vibrations, such as high-order vibrations with extremely small amplitudes, such as the vibration sound of a transformer. There has been no anti-vibration foundation that reduces the level of sound pressure of the so-called sound and also has a seismic isolation effect.

The present invention has been made in view of the above circumstances, and its purpose is to provide a vibration-isolating foundation that reduces fixed transmission sound and has a seismic isolation effect.

≪Means for Solving the Problems≫ In order to achieve the above object, the vibration-proof foundation of the present invention includes a floor slab on which a vibration noise generation source such as a transformer or generator is directly mounted, and a floor slab that is placed on the foundation. A frame supporting the frame body, a leaf spring vertically slidably installed in the frame body, a columnar rubber-based elastic body provided around the outer periphery of the leaf spring, and a frame body supporting the leaf spring and the elastic body. The frame body includes sand densely packed inside the frame body, and the floor slab is supported by the top surface of the leaf spring.

≪Operation≫ The plate spring bears the load of the vibration noise source, allowing positional displacement between the base and the vibration source, and at the same time, the elasticity and restoring force of the plate spring, that is, the mass of the vibration noise source and the plate spring. The input acceleration is delayed while absorbing the vibration energy on the foundation or vibration source side with a natural vibration period determined mainly by the elasticity of the vibration source, resulting in a seismic isolation effect. In addition, the relatively large movement of the leaf spring is ensured by the elasticity of the rubber-based elastic body, and the problem of dominant period is ensured by the frame via sand.

Vibration sound (solid-transmitted sound), etc. is efficiently propagated to the sand by the large flat area of the leaf spring, and is absorbed by the movement of the sand.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 shows the details of a frame 1 for supporting a floor slab, which consists of a square box, in which leaf springs 2 vertically erected are arranged at regular intervals in the vertical and horizontal directions. ing.

Further, an elastic body 3 made of rubber formed into a cylindrical shape is arranged vertically around the outer periphery of each leaf spring 2, and these leaf springs 2
Sand 4 is filled between the elastic body 3 and the elastic body 3.

A means for erecting the leaf spring 2 is shown in FIG. A support member 5 having an inverted T-shaped cross section is attached to the bottom of the frame body 1 to sandwich the leaf spring 2 therebetween. That is, the T-shaped support member 5 is inverted so that the horizontal part, which is the upper side, faces down, and the horizontal part is fixed to a predetermined position on the bottom of the frame body 1 with bolts 6, and at the end of the vertical side there is a horizontally long part. A fitting groove 7 is formed, and the bottom of the leaf spring 2 is fitted into the fitting groove 7, and the leaf spring 2 is fixed to the support member 5 by passing a bolt 8 from the side.

Similarly, the upper end of the leaf spring 2 is also held by a support member 5, but in this case, the reference numeral is temporarily designated as a support member 5a for easy differentiation.The support member 5a is bolted to the floor slab 10, and its fitting A sliding material 12 is provided in the groove 7a,
For example, attach a Teflon plate to the upper end of the leaf spring 2 and the support material 5.
The upper end portion of the leaf spring 2 is held slidably in the longitudinal extension direction of the leaf spring 2.

FIG. 3 shows a cross section of the entire structure, and the transformer 14 is installed in the floor slab 10. A support member 5a is bolted to the back side of the floor slab 10 in advance, and the leaf spring 2 is fitted and fixed to the support member 5 on the frame 1 side installed on the base 16, and then the elastic body 3 is installed. Sand 4 is filled with sand 4, and then the floor slab 10 is supported by the upper end edge of the leaf spring 2 while fitting the supporting member 5a on the floor slab 10 side to the upper end of the leaf spring 2.

Therefore, the vibration of the transformer 14 is caused by the vibration of the floor slab 1.
0. It is integrated with the leaf spring 2, and the vibration energy propagated from the leaf spring 2 to each grain of sand 4 becomes frictional energy of the sand 4 and disappears. Therefore, no resonance phenomenon occurs. In addition, the elastic body 3 allows the leaf spring 2 to vibrate greatly in response to earthquake motion of the base 16, and the leaf spring 2, which is located in the longitudinal direction in the same direction as the vibration direction, uses the support material with the help of the sliding material 12. It slides within 5a. As a result, unnecessary resistance to the movement of the leaf spring 2 perpendicular to the amplitude direction is actively eliminated, and the vibration energy is borne as much as possible by the sand 4 and the elastic body 3.

Regarding the predominant period during an earthquake, since the elastic body 3, leaf spring 2, etc. are all housed in the frame 1 filled with sand 4, as long as the strength of the frame 1 is maintained, the leaf spring 2 due to this There is no particular problem with the support strength, etc.

<<Effects>> As explained in detail above, in the vibration-proof foundation of the present invention, a plate spring installed upright in a frame supports a vibration sound generation source, and sand is filled around the plate spring, and a rubber material is added to the sand. Since the system elastic body is buried and the leaf spring can slide in its longitudinal direction (both ends), it can efficiently propagate micro-vibrations into the sand and sufficiently cope with earthquake input with large amplitude. It is something that can be done.

[Brief explanation of the drawing]

Figure 1 is a plan view explaining the inside of the frame of the anti-vibration foundation;
FIG. 2 is a partial perspective view showing details of the supporting portion of the leaf spring, and FIG. 3 is a sectional view of the vibration-proof foundation. 1... Frame body, 2... Leaf spring, 3... Elastic body, 4
... sand, 5 ... support material, 6 ... bolt, 7 ... fitting groove, 8 ... bolt, 10 ... floor slab, 12 ...
...Sliding material, 14...Transformer, 16...Base.

Claims (1)

[Claims] 1. A floor slab on which a vibration noise generating source such as a transformer or generator is directly mounted, a frame body supporting the floor slab on a base, and a leaf spring installed slidably in the longitudinal direction within the frame body. , comprising a columnar rubber-based elastic body provided around the outer periphery of the leaf spring, and sand densely packed into the frame including the periphery of the leaf spring and the elastic body, and the top surface of the leaf spring. A vibration-proof foundation that supports the floor slab.