SUSPENSION FRAME SHAKE PREVENTING DEVICE FOR FLOATING CRANE

PROBLEM TO BE SOLVED: To quickly restrain shake of a suspension frame of a floating crane at the time of waving. SOLUTION: A damper 17 is installed on a suspension frame 12 suspended from the extreme end of a jib 10 of a floating crane 16. The damper 17 is constituted so that a weight 24 is reciprocated in the horizontal direction by drive of an actuator. A first accelerometer 18 is fitted to the extreme end of the jib 10, and a second accelerometer 19 is fitted to the suspension frame 12. A control device 20 sending a drive command to the actuator of the damper 17 based on the detected signals of the first accelerometer 18 and the second accelerometer 19 is provided. A constant setter adding a signal based on the phase difference between the displacement of the extreme end of the jib 10 and the displacement of the suspension frame 12 to a drive command is provided.