JPH0518436A - Vibration isolating device using crane - Google Patents

Abstract

PURPOSE:To facilitate suppressing long-period vibration of a structure by installing a crane with a hung weight over the structure being erected where vertical vibrations are likely generated, and controlling a servo motor for a crane winch with a vibration sensor mounted on the structure. CONSTITUTION:A crane 1 is installed over a structure 5 being erected, and a weight 4 is mounted at a hook 3 at the foremost of a wire 11 to be wound on a winch 10. This winch 10 is driven by a servo motor 2 via a gear box 9. A sensing signal from a vibration sensor 6 mounted on the structure 5 is fed to a calculator 7, and thereupon the servo motor 2 is controlled. A command signal for canceling the vibration is determined through computation and sent to a servo back 8, which drives the servo motor 2. Thus tremor of the structure 5 is suppressed by vertical motions of the weight 4 with the servo motor 2 controlled with the sensor 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control device using a crane, which is applied to vertical vibration control during construction of a general structure.

[0002]

2. Description of the Related Art Conventionally, as a vibration damping device for general structures, a jig represented by, for example, a cantilever type is attached to the structure for vibration damping.

[0003]

However, in a completed structure system or a jig or the like required for erection work, a vibration damping device is provided completely separately from the jig, so that it is wasteful and the mechanism of the conventional device has a vibration damping function. There was a technical limit in the vibration cycle of the object, and it was difficult to suppress the vibration of a long cycle of about 10 seconds, or the mechanism was extremely complicated.

The present invention was developed to address such problems, and it is an object of the present invention to enable damping of long-period vibration with a simple mechanism.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention relates to a structure 5 under construction in which vertical vibration occurs. On the other hand, a crane 1 in which a weight 4 is suspended is installed, a winch 10 of the crane 1 is provided with a servo motor 9, and the servo motor 9 is controlled by a vibration detection sensor 6 installed in the structure 5. And

[0006]

According to the present invention, the weight suspended by the above-mentioned means causes the winch controlled by the vibration detecting sensor to move upward and downward, and the vertical movement of the weight causes vibration of the structure. Suppress.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1. Reference numeral 1 denotes a crane, which is installed on a structure 5 and wound around a winch 10 to form a wire 1.
A weight 4 is attached to the hook 3 at the tip of the device 1. The winch 10 is connected to the servo motor 2 via the gear box 9.
The servomotor 2 inputs a signal detected by the sensor 6 to a calculator 7 such as a personal computer or a sequencer so that the servomotor 2 is controlled by the vibration detecting sensor 6 installed on the structure 5. A command signal that gives a motion for canceling the vibration is calculated and obtained and sent to the servo back 8, and the servo motor 2 is driven by the servo back 8.

Thus, the servomotor 2 controlled by the vibration detecting sensor 6 winds up and lowers the winch wire 11, and as a result, the vertical movement of the weight 4 suspended on the hook 3 at the tip of the wire 11 is performed. Vibration of the structure 5 is suppressed.

[0009]

As described above, according to the present invention, the crane in which the weight is suspended is installed on the structure under construction, the winch of the crane is provided with the servomotor, and the servomotor is installed on the structure. Since it is controlled by the vibration detection sensor, the weight suspended by the crane is hoisted and unwound by the vibration detection sensor to enable long-cycle up-and-down reciprocating motion, which facilitates long-cycle vibration control. In addition, the mechanical elements unique to the vibration device can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Crane 2 Servo Motor 4 Weight 5 Structure 6 Vibration Detection Sensor 10 Winch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideaki Harada Inventor Hideaki Harada 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Inventor Seiji Sakamoto 4-chome Kannon Shinmachi, Nishi-ku, Hiroshima Prefecture 6-22 No. 22 Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (1)

Claim: What is claimed is: 1. A crane in which a weight is suspended is installed to a structure being erected which vertically vibrates, and a winch of the crane is provided with a servo motor. A vibration damping device using a crane, characterized by being controlled by a vibration detecting sensor installed on the structure.