BUCKET CONTROL SYSTEM FOR CABLE CRANE

PROBLEM TO BE SOLVED: To provide a bucket control system for a cable crane capable of accurately and quickly lowering a bucket to a target position without using an optical means such as an photoelectric sensor, a total station and a video camera. SOLUTION: This cable crane comprises a transverse trolley 3 towed by a towing rope 4 to be traveled along a main rope 2, and a concrete bucket 6 suspended from a lower part of the trolley 3 through a suspension rope 5, and the trolley 3 and the bucket 6 are moved by winding and unwinding the towing rope 4 and the suspension rope 5 by means of winches 7, 8. A GPS receiver 82 is loaded on the bucket 6, so that the GPS receiver 80 receives an electric wave from a satellite 90 to detect a present position of the bucket 6, when the bucket 6 is lowered from the neighborhood of an upper part of each target position A, B. The trolley 3 is moved on the basis of a result of the detection to correct the position of the bucket 6 to place the bucket 6 within a predetermined error allowable range.