Height adjustment assistance device, crane comprising same, and height adjustment method

A height adjustment assistance device for assisting in adjusting a height of a counterweight, from a ground, suspended from a tip of a mast of a crane through a hanging member after lifting work for a suspended cargo suspended from a jib member of the crane, the height adjustment assistance device comprising:

• an initial state determination part which determines whether the suspended cargo has been lifted from the ground at a start of the lifting work;
• a height detection part which detects the height of the counterweight from the ground;
• a storage part which stores, as an initial height, the height of the counterweight from the ground detected by the height detection part when the initial state determination part determines that the suspended cargo has been lifted;
• a calculation part which calculates a target value for correcting the height of the counterweight from the ground based on the initial height stored in the storage part and a post-work height that is the height of the counterweight from the ground detected by the height detection part after the lifting work is performed and before the suspended cargo is placed on the ground;
• a notification part configured to notify an operator of information regarding the target value;
• and
• a length adjustment device configured to adjust a length of the hanging member by operating in a manner to change the length of the hanging member extending from the tip of the mast to the counterweight.