JPS6324747Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a dynamic damper for suppressing vibrations of a building structure, such as a beam.

Vibration problems often occur after a building is completed. For example, when a cooling tower is installed on the roof of a building, or when a new machine is installed indoors, beams and the like may still vibrate even after taking as many anti-vibration measures as possible at the source of the vibration. In such cases, it would be very convenient if a dynamic vibration damper could be installed at the most effective location in the existing building to suppress the vibrations.

The present invention was developed for this purpose, and it can be easily installed and removed as needed, and the weight of the weight can be adjusted according to the excitation frequency that the vibrating body is receiving. We have devised a simple dynamic vibration damper whose frequency can be adjusted arbitrarily.

To explain the embodiments of the drawings, Figures 1 and 2 show the dynamic vibration damper of the present invention installed on a beam (H-shaped steel) of a building. It mainly consists of a bracket 2 removably fixed directly below the body (beam), a hanger 6 suspended from this bracket 2 via a spring 1, and a weight assembly 8 suspended from this hanger 6. There is. In the illustrated example, the bracket 2 is removably attached to the beam by using tie plates 3, tie bolts 4, and fixers 5. That is, the tie plate 3 is placed on the beam so that the bolt holes provided on both edges thereof protrude beyond the width of the beam, and the tie bolts 4, which are longer than the height of the beam itself, are inserted into the bolt holes. The upper end of the tie bolt 4 is fixed to the upper flange of the beam by a nut 11 so that the tie plate 3 and the fixer 5 narrow the beam flange.
On the other hand, insert the lower ends of the tie bolts 4 hanging down on both sides of the beam into the bolt holes provided at both ends of the bracket 2, and connect the lower ends of the tie bolts 4 and the bracket 2 so that the bracket 2 and the fixer 5 narrow the beam flange. is fixed to the lower flange of the beam by nuts 12.

Bracket 2 uses a U-shaped one,
A hanger 6 is suspended from above via a spring 1 so as to straddle this. As shown in FIGS. 3 and 4, this hanger 6 has a symmetrical inverted U shape.
It is shaped like a letter and has a bolt hole 13 in the center. In addition, both sleeve portions are formed with flat parts having the same plane, and pin holes 14 parallel to each other are formed in both the flat parts.
is provided. When attaching the hanger 6 to the bracket 2, as shown in FIG. 18 is tightened and interposed with the bolt 15, and then the spring 1 is inserted.
As a result, the U-shaped bracket 2 and the inverted U-shaped hanger 6 cross each other at their centers and are elastically joined.

Furthermore, a large number of weight assemblies 8 are suspended from the hanger 6, the number of which is adjusted to have a natural frequency that matches the excitation frequency that the vibrating body is receiving. As shown in Figs. 1 and 2, the pin 7 is passed in parallel through the pin hole 14 (Figs. 3 and 4) of the hanger 6, the center part of this pin is received by the pin hole 14, and the pin is The same number of plate-shaped weights having the same weight and shape are inserted on both sides to balance the left and right sides, and clamps 9 are applied to both extreme ends and tightened with clamp bolts 10. The protruding end of the pin 7 is fixed to the clamp 9 by a stopper 16 to prevent the weight from falling accidentally. In the manner described above, the bracket 2, hanger 6, and weight assembly 8 can be easily attached to the beam with the necessary weight weight, and can be easily removed by performing the reverse operation.

Figure 5 shows an example of a building frame in which a cooling tower is installed on the roof of a building at the position shown by the broken line. Vibration of the beam can be effectively prevented by installing the beam. Note that C-CT in FIG. 5 represents the center of the cooling tower.

As described above, the present invention allows the mass of the weight for adjusting the natural frequency of the dynamic vibration damper to be arbitrarily adjusted, and can be easily installed at any location without providing a preliminary mounting structure on the vibrating body itself. Since it can be installed on
When a vibration problem occurs in an existing building, it is now possible to install a dynamic vibration damper with the most appropriate natural frequency at the most appropriate position to effectively prevent the vibration. Very effective in problem solving.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the mounting structure of the vibration damper of the present invention to a beam, FIG. 2 is a vertical cross-sectional view of the vibration damper of FIG. 1, FIG. 3 is a front view of the hanger, FIG. 4 is a bottom view of the hanger, and FIG. 5 is a building frame plan showing an example of the mounting position of the vibration damper. 1...Spring, 2...Bracket, 3...
Tie plate, 4...tie bolt, 5...fixer, 6...hanger, 7...pin, 8...weight, 9...clamp, 10...clamp bolt.

Claims (1)

[Scope of utility model registration request] This is a dynamic vibration damper that suppresses vibrations generated when a machine is installed in a building, and a bracket 2 is fixed to a beam that is vibrating due to the installed machine, which is the source of vibration. 2 to spring 1
The hanger 6 is suspended through the
A structure of a dynamic vibration damper in which a weight assembly 8 whose number is adjusted to have a natural frequency corresponding to the excitation frequency being received by the beam is attached to the beam.