JPH05156841A - Pendulum type vibration-restraint device - Google Patents

Abstract

PURPOSE:To make easily adjustable the fitting position of a weight at a pendulum type vibration-restraint device. CONSTITUTION:A post member 12 is pivot-supported on a structure 2 through a universal joint 11 at the lower end, and at the same time swingably supported on the structure 2 through plural shock absorbing members 16, 17 at its perimeter portion. A weight 22 is fitted to the upper part of the post member 12 through a stud bolt 18 and nuts 20 24, and a jack 25 that is engaged with the weight 22 and adjusts height is provided in the post member 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pendulum type vibration damping device.

[0002]

2. Description of the Related Art As a stationary vibration control device for structures such as towers that generate long-period vibrations, a device having a mechanism in which a weight is oscillated in a pendulum manner via an attenuator is known. There is. This device is installed near the top of the structure, the vibration cycle of the structure is measured on site, and the pendulum length is adjusted on site so that the cycle matches.

[0003]

The adjustment and attachment of the pendulum length of the above-described pendulum type vibration damping device is usually performed by a method of adjusting the weight attachment position on the pendulum rod, for example, 300 k.
A g-scale weight is hung by a chain block or the like, mounted on a pendulum rod, the vibration cycle is measured, and the height position is adjusted.

The above-mentioned work is very dangerous and difficult because a heavy weight is suspended in a narrow place near the top of the swinging structure and the work is carried out in the immediate vicinity. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a device which can be easily mounted and adjusted on site and is less dangerous.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIG. 1 and FIG. 2 corresponding to the embodiments. In the present invention, the post member 12 is provided with a universal joint 11 at the lower end. Is pivotally supported on the structure 2 and is swingably supported on the structure 2 via a plurality of cushioning members 16 and 17 in the peripheral portion, and the stud bolt 1 is mounted on the post member 12 at its upper part.
8 and nuts 20 and 24 are attached to the weight 22, and a jack 25 for adjusting the height by engaging with the weight 22 is provided in the post member 12.

[0006]

According to the present invention, the weight is provided with a vertical hole which is aligned with a plurality of stud bolts provided vertically on the post member and fitted by the above means, and a receiving nut and a press nut that mesh with the bolt are used to mount the weight on the stud bolt. Set the height position on and mount it. To adjust the height of the weight, when moving the weight upward, loosen the stud bolt holding nut, push up the weight with the jack in the post member, and move the receiving nut on the stud bolt upward to raise. When fixing the weight on the receiving nut and moving the weight downward, place the jack on the lower surface of the weight and move the receiving bolt downward, lower the weight with the jack to the nut height, Follow the procedure to tighten and fix the presser bolt.

[0007]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram showing a vibration damping device 1 according to the present invention as a vibration-damped structure 2 attached near the top of a steel tower. 2 and 3 are a side view and a plan view of a specific example of the vibration damping device 1, in which 10 is a mount on the structure 2, 11 is a universal joint fixed on the mount 10, and 12 is a plan view.
Is a post member whose lower end is connected to the universal joint 11, 13 is a circular projecting plate provided below the post member, and 14 is a mount 10.
An annular fixed support plate provided on a plurality of fixed legs 15 at the peripheral portion, 16 is a buffer member composed of a plurality of coil springs vertically connected between the fixed support plate 14 and the overhang plate 13, and 17 is similarly fixed. A buffer member composed of a plurality of cylinder type buffers vertically connected between the support plate 14 and the overhang plate 13, and 18 is a nut 19 and 19 on the flange 12a at the upper end of the post member 12.
Plural stud bolts fixed at the lower end with 2
Reference numeral 0 is a receiving nut engaged with the stud bolt 18, 21 is a receiving plate fitted into the stud bolt 18 and in contact with the receiving nut 20, 22 is a weight composed of a plurality of steel plates 22 a inserted through the stud bolt 18, 23 Reference numerals 24 and 24 denote a pressing plate and a pressing nut engaged with the stud bolt 18, and 25 denotes a hydraulic cylinder type jack which is disposed in the post member 12 and is in contact with the lower surface of the receiving plate 21 via the driving end metal fitting 26. As the jack 25, a type in which a manual hydraulic pump is connected and used is used, or another type such as a gear jack may be used. 27 is a mount 10 that covers the entire apparatus.
It is a cylindrical cover that is attached on top.

In the above-described device, the post member 12 and the weight 22 are integrally formed and swing in a reverse pendulum shape about the universal joint 11 as indicated by an arrow 28 in accordance with the swing direction of the structure 2. The post member 12 includes the coil spring 16 and the cushioning member 1 described above.
7 and the mass of the weight 22 generate a long-period vibration substantially similar to the structure 2, and the actual vibration of the structure 2 at the mounting position of the vibration damping device 1 shown in FIG. The period is measured, and the mounting height of the weight 22 of the vibration damping device 1 is adjusted so that the vibration period of the vibration damping device 1 matches the cycle of the structure 2.

In the above-described apparatus, this adjustment is performed. To move the weight 22 upward, loosen the holding nut 24, extend the jack 25 to drive the weight 22, and push up the weight 22. To move downward, drive end fitting 2 of jack 25
6 is applied to the lower surface of the receiving plate 21, the receiving nut 20 is loosened, and the jack 25 is contracted and driven to lower the weight 22 and presser nut 2
By tightening 4, the height of the weight 22 can be changed. Therefore, the danger of unfastening the nuts 20 and 24 and raising and lowering the weight 22 near the point where the weight 22 is hung and supported by another lifting tool as in the conventional art is eliminated, and the weight 25 can be safely and safely operated by the jack 25. Can be easily adjusted up and down.

It should be noted that, in the above-described structure, the structure and combination of each of the jack, the shock absorber including the coil spring, the weight, and the like are not limited to the above embodiments, but may be variously modified within the scope of the invention. I will get it.

[0011]

As described above, according to the present invention, the post member is pivotally supported on the structure through the universal joint at the lower end and is swingably supported by the structure through the buffer member at the peripheral portion, A weight is attached to the upper part of the post member via a stud bolt and a nut so that the height position can be adjusted, and a jack for engaging with the weight and adjusting the height is provided in the post member. Therefore, when adjusting the vibration period when installing the vibration damping device, that is, adjusting the height of the weight on the post member, it is dangerous and difficult to suspend and attach the mounting bolt and nut in the immediate vicinity, suspending and supporting a heavy weight. It is advantageous that the weight height and weight can be adjusted and mounted safely and easily by simply loosening the holding nut and receiving nut, tightening and jacking.

[Brief description of drawings]

FIG. 1 is a schematic view showing a mounted state of a vibration damping device according to an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a plan view of FIG.

[Explanation of symbols]

 2 structures 11 universal joints 12 post members 16 cushioning members 17 cushioning members 18 stud bolts 20 nuts 22 weights 24 nuts 25 jacks

Claims (1)

[Claims] 1. A post member is pivotally supported on a structure via a universal joint at the lower end, and is swingably supported on the structure via a plurality of buffer members in the peripheral portion, and the upper part of the post member is provided. A pendulum type vibration damping device, characterized in that a weight is attached to the above through a stud bolt and a nut, and a jack that engages with the weight and adjusts the height is provided in the pump member.