This series of tower cranes, ranging from QTZ31.5 to QTZ315 has a horizontal jib frame, a jib-trolley radius-changing mechanism and a hydraulic self-raising mechanism. 

    It is original in design, reliable in operation and satisfactory in shape. Equipped with all necessary safety devices, these cranes show a good speed-control capacity, satisfactory operating stability and high work efficiency. 

    They can be widely used for the construction of high-rise hotels, residential buildings, high-rise industrial buildings, large-span factory buildings and tower-like buildings like tall chimneys.