DETECTION DEVICE OF TENSION OF HEAVY OBJECT SUPPORTING CABLE

PROBLEM TO BE SOLVED: To provide a device that highly accurately measures and controls the tension of a heavy object supporting cable for a long period of time.SOLUTION: A detection device of tension of a heavy object supporting cable detects the variation of the tension of a heavy object supporting cable 4 that is connected to a main tower 2 to support a heavy object. The detection device of tension of the heavy object supporting cable comprises a hydraulic load cell 14, which is disposed between an anchor pipe 11 fixed to the main tower side and a socket 12 attached to an end of the heavy object supporting cable 4 and penetrated to the anchor pipe 11, to detect the pressure from the anchor pipe 11 and the socket 12. The hydraulic load cell 14 comprises: a plurality of hydraulic cylinders that are fit in a slidable manner as filled with a hydraulic oil and with pistons protruded; a communication passage that communicates with respective hydraulic cylinders and averages the pressures of the hydraulic oil filled in the respective hydraulic cylinders; and a pressure detection part that detects the pressures of the hydraulic oil averaged by the communication passage.