JPH045782Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a vibration damping device that suppresses sudden vibrations while allowing heat transfer of a damped object.

"Conventional technology" Generally, piping, etc. in nuclear power plants, chemical plants, etc., where safety is strongly required, is equipped with a vibration damping device to prevent it from being destroyed by vibrations such as earthquakes. . The vibration damping device is used when piping or the like handles high-temperature fluid.
It is also required to have the ability to allow that heat transfer.

As such a vibration damping device, the present applicant proposed the following technology in Utility Application No. 58-204372. As shown in FIG. 3, in this vibration damping device 10, a support structure 3 near a vibration damped body 2 such as a pipe, etc.
Zn-A, Sn-Bi on both sides of the elastic layer 6 of leaf springs etc.
A beam member 5 formed by adhering a plastic layer 7 such as the like is fixed in a so-called cantilevered state, and a damped body 2 is connected to the tip thereof. In response to external forces caused by rapid vibrations such as earthquakes, the plastic layer 7 undergoes rapid plastic deformation to generate large stress, regulates the elastic deformation of the elastic layer 6, and absorbs vibration energy. In response to a gentle external force due to thermal movement of the vibration damped body 2, the generated stress becomes small, and the entire beam member 5 easily deforms due to elastic deformation of the elastic layer 6, allowing the thermal movement. It is something that can be done.

"Problems to be solved by the invention" By the way, in such a vibration damping device 10,
When an external force due to sudden vibration acts, energy is absorbed by the plastic deformation of the plastic layer 7 as described above, but when this plastic deformation occurs, the rigidity of the beam member 5 decreases. To,
A problem arises in that the natural frequency of the damped body 2 including the vibration damping device 10 decreases, and the damping function appears to be reduced.

The present invention was proposed in order to improve the above-mentioned problems, and aims to suppress the decrease in rigidity due to the occurrence of plastic deformation and effectively exhibit the vibration damping function.

``Means for Solving the Problems'' The present invention involves erecting a plurality of beam members parallel to each other at intervals in the direction of action of the external force to be supported, on a bracket attached to a supporting structure, and The elastic regions of the members are configured to be different from each other, and their tips are connected to each other by a connecting member,
It is characterized in that a vibration damped body is supported by the connecting member.

``Operation'' The vibration damping device of the present invention has the same displacement in each connected beam member when an external force such as an earthquake is applied, but because the elastic ranges of these members are different, the magnitude of the external force is Each beam member will be plastically deformed one by one in response to this. Therefore, even if plastic changes occur in some beam members, elastic regions remain in other beam members, and the beam members with remaining elastic regions will experience a decrease in rigidity due to the plastic deformation. By supplementing this, it is possible to suppress a decrease in overall rigidity. Further, vibration energy can be absorbed by the stepwise generation of plastic deformation by each beam member while suppressing the decrease in rigidity.

"Embodiment" Hereinafter, an embodiment of the vibration damping device of the present invention will be described based on FIGS. 1 and 2.

This vibration damping device 1 shows an example in which the damped body 2 is a pipe, and the vibration damped body 2 and walls in its vicinity are arranged so as to support the external force in the horizontal direction on the damped body 2. The support structure 3 is provided in a horizontally connected state.

That is, a pin-coupled bracket 4 is horizontally projected from the support structure 3, and a tapered surface 4a is formed on the bracket 4 with a downward slope horizontally outward from the support structure 3 side. On the tapered surface 4a, a plurality of beam members 5A to 5F extending in the vertical direction are erected in parallel at mutual intervals.

These beam members 5A to 5F have a plate shape in which a plastic layer 7 is adhered to both sides of an elastic layer 6, and
As shown in Figure 2, the beam is formed so that its width gradually increases from the tip to the base, and when an external force is applied in the thickness direction, the stress is equal at each position along the length of the beam. , so-called equal stress beams, and each of the beam members 5A to 5F is formed to have different lengths. Each of these beam members 5A to 5F is erected on the tapered surface 4a of the bracket 4 in order from the shorter one horizontally outward from the support structure 3 side, and the difference in length and the length of the bracket 4 are By confronting the slope of the tapered surface 4a, each beam member 5A to 5F
Their tips are arranged horizontally in a row.

A horizontal connecting member 8 connects the tips of each of the beam members 5A to 5F with each other.
A to 5F are connected by pins 9, and the vibration damped body 2 is supported at the tip of the connecting member 8.

As shown in the conventional example, the vibration damping device 1 configured in this manner has both a vibration damping function due to the plastic deformation of the plastic layer 7 and a heat transfer allowing function due to the elastic deformation of the entire structure. Of course, the vibration damping function is the same for each beam member 5A to 5F.
It can be used effectively even when plastic deformation occurs in a part of the body.

That is, since the tips of the beam members 5A to 5F are connected to each other by the connecting member 8, the horizontal displacements of the tips are all the same, as shown by X in FIG. 1, for example. Due to the mutually different lengths, in the example of FIG. 1, the largest stress occurs in the left end beam member 5A, and the stress decreases as it goes to the right side. Therefore, as the displacement of the connecting member 8 increases due to external force, the leftmost beam member 5
Plastic deformation occurs sequentially from A. In other words, when the leftmost beam member 5A undergoes plastic deformation, the rightmost beam member 5B is still in the elastic region, and the rightmost beam member 5F
Until plastic deformation occurs, some of the beam members will remain in an elastic region. Then, the beam member that retains this elastic region compensates for the decrease in rigidity due to plastic deformation of the beam member up to its left adjacent position, thereby suppressing the decrease in rigidity as a whole, and suppressing the decrease in rigidity. Each beam member 5A to 5F
Vibration energy can be absorbed by the gradual occurrence of plastic deformation, and the vibration damping function can be effectively exhibited.

In the above embodiment, the elastic ranges of the beam members 5A to 5F are made different by changing the lengths of the beam members 5A to 5F. Further, the detailed structure such as the number of beam members and the shape of the bracket is not limited to the one embodiment.

"Effects of the Invention" As explained above, according to the vibration damping device of the present invention, the plurality of beam members with different elastic ranges are configured to support external forces in a mutually connected state. When vibration occurs, each beam member undergoes plastic deformation in sequence depending on the magnitude of the external force.
Even if plastic deformation occurs in some of the beam members, the decrease in rigidity due to the plastic deformation can be compensated for by other beam members in the elastic range, and the decrease in rigidity as a whole can be suppressed. In this way, vibration energy can be absorbed by the gradual generation of plastic deformation in each beam member while suppressing a decrease in rigidity, and the vibration damping function can be effectively exhibited. be.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an embodiment of the vibration damping device of the present invention, Fig. 2 is a view taken along the - line in Fig. 1, and Fig. 3 is a front view showing a conventional example of the vibration damping device. It is. DESCRIPTION OF SYMBOLS 1... Vibration damping device, 2... Vibration damped object, 3... Support structure, 4... Bracket, 4a... Tapered surface, 5A to 5F... Beam member, 6... Elastic layer, 7...
...Plastic layer, 8...Connecting member.

Claims (1)

[Scope of utility model registration request] A plurality of beam members are erected in parallel with each other at intervals in the direction of action of the external force to be supported on a bracket attached to a support structure near the vibration damping object, and
A connecting member is provided to connect the ends of these beam members, and a vibration damped body is supported on the connecting member, and the beam member has a laminated structure of an elastic layer and a plastic layer, and the elastic region thereof is A vibration damping device that is different for each beam member.