JPS5989847A - Vibration limiter - Google Patents

Abstract

PURPOSE:To obtain a larger limiting effect of vibration when a response becomes large amplitude at occurrence of an earthquake, by arranging a shaft rod disc moving in the shaft direction in a cylindrical body, both ends of which are closed, further providing protrusions, deformed by movement of the disc, in end faces of the cylindrical body. CONSTITUTION:Cylindrical protrusions 7, with a smaller yield load as compared with that of a shaft rod 3, are provided in the internal faces of end walls of a cylindrical body 1, and suitable clearances 8 are provided between a plate shaped end 5 provided in the internal end of the shaft rod 3 and said protrusions. When the shaft rod 3 is largely moved in either the left or the right direction, the plate shaped end 5 collides against the protrusion 7 to cause the protrusion 7 to generate elastic deformation. From this condition, if the shaft rod 3 is further moved in the same direction, the protrusion 7 yields to generate plastic deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a vibration damping device that suppresses vibrations of piping and other structures during an earthquake.

[Prior art and its problems]

Structures with low damping, such as piping, generate large vibrations during an earthquake. To prevent this, hydraulic vibration damping devices are installed. However, with conventional damping devices, the damping characteristics do not change much for large amplitudes or small amplitudes (there is a drawback that the larger the other-world input is, the larger the response amplitude is). Ta.

[Object of the Invention] - The present invention was made based on the above circumstances, and an object of the present invention is to obtain an allocation device that has a greater allocation effect when the response becomes large amplitude during an earthquake.

[Summary of the invention]

The present invention provides a control system in which a disk provided at the inner end of a shaft rod that moves in the axial direction is disposed inside a cylinder whose both ends are closed, and a protrusion deformed by the movement of the disk is provided on the end surface of the cylinder. It is a shaking device.

〔Effect of the invention〕

According to the present invention, when a structure such as a pipe vibrates, the attached shaft rod moves according to the movement of the structure and transmits force to the protrusion provided opposite to the shaft rod. As the amplitude of the structure increases, the plasticity of the protrusion increases, which has the effect of increasing damping.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the drawings.

In FIG. 1, a cylinder 1 of the vibration damping device has a hollow cylindrical shape, and one end wall 1a thereof is provided with an eye 2 for attachment, and the other end wall 1b is provided with a shaft rod in the center. 3 is provided with a hole that passes through the hole. The inner end of the shaft rod is provided with a plate-shaped end 5 having a larger diameter than the shaft rod, and the outer end is provided with a mounting switch 6.

A cylindrical projection 7 having a smaller yield load than the shaft rod 3 is provided on the inner surface of the end wall of the cylinder 1, and between it and a plate-shaped end 5 provided at the inner end of the shaft rod, A suitable gap 8 is provided.

In the present invention having the above configuration, when the shaft rod 3 is moved largely in either the left or right direction, the plate-like end 5 collides with the protrusion 7,
The protrusion 7 is caused to undergo elastic deformation.

If the shaft 3 further moves in the same direction from this state, the protrusion 7
yields and plastic deformation occurs.

Next, the functions and effects of the actual usage example of the sewage inventive device shown in FIG. 2 will be explained. In FIG. 2, the pipe 9, which has a vertical part and a horizontal part, connects the eye 2 at the end of the cylinder 1 to the wall surface 10. It is supported by the device of the present invention rotatably attached to plaques (12, 13) provided on the floor surface (11).

That is, the eye 6 at the tip of the shaft 3 of the apparatus of the present invention, which is attached to the wall and floor as described above, is connected to the supports 14 and 1.5 which are attached to the vertical and horizontal parts of the pipe 9, respectively.

When the piping 9 is moved by shaking during an earthquake, if the amplitude is smaller than the gap 8 by 5, the shaft rod 3 is not restrained at all,
The pipe 9 moves freely as the earthquake vibrates. On the other hand, if the amplitude is larger than the gap 8 and the deformation of the protrusion 7 remains within the elastic range, vibration energy is consumed by the collision between the plate-like end 5 of the shaft rod 3 and the protrusion 7, resulting in damping. Effects can be obtained. Furthermore, the amplitude of the pipe 9 increases, and the protrusion 7
surrenders. At this time, the relationship between the force and the deflection generated on the protrusion 7 is as shown in FIG. In FIG. 3, according to the displacement J of the shaft rod 3, the force F generated on the protrusion 7 is first elastically deformed from the neutral point 16 to the contact point 17 to reach the yield point 18, and then removed by yielding. Loading point 1
The state shifts to 91 and returns to the non-contact state at 20 due to unloading. It is generally known that when a structural material traces a history as shown in FIG. 3, energy represented by the areas of rectangles 17, 18, 19, and 20 is consumed. Therefore, when the amplitude of the pipe 9 increases, the protrusion 7 yields and a damping effect is obtained.

Although the present invention has been described above with reference to specific examples, the present invention is not limited to these specific examples, and it goes without saying that many changes and modifications can be made without departing from the spirit of the present invention. be.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a simple embodiment of the present invention, FIG. 2 is a front view showing the usage state of the present invention, and FIG. 3 is a diagram showing the Kerr displacement relationship for explaining the present invention in detail. . DESCRIPTION OF SYMBOLS 1... Cylindrical body, 3... Shaft rod, 5... Plate-shaped end, 7...
·protrusion.

Claims (1)

[Claims] A cylindrical body having a mounting member at one end, a shaft rod that passes through the other end of the cylinder body, has a mounting member at the outer end, and has a disc at the inner end, and the amount of movement of this shaft rod is determined in advance. An allocation device characterized by having a protrusion on the top that contacts the shaft rod and deforms due to the force applied by the shaft rod when the value exceeds a predetermined value.