A sheave device retracting and unfolding step (S12) includes winding and unwinding a rope (R) by a winch (W), with a lifting side sheave device (Db) lifted by an assist crane (80). A tension information detecting step (S21) includes detecting rope state information on the rope (R) when the sheave device retracting and unfolding step (S12) is performed. A tension information using step (S30) includes performing at least one of notification to a worker and drive control of the winch W based on the rope state information detected in the tension information detecting step (S21).
SHEAVE DEVICE RETRACTING AND UNFOLDING METHOD
VERFAHREN ZUM EINZIEHEN UND AUSKLAPPEN EINER RIEMENSCHEIBENVORRICHTUNG
PROCÉDÉ DE RÉTRACTION ET DE DÉPLOIEMENT DE DISPOSITIF DE POULIE
2025-05-14
Patent
Electronic Resource
English