QTZ800 tower crane was designed by China Construction Scientific Research Institute Construction Mechanization Sub-Institute and developed by our company. It is a multiple-function hydraulic auto-lift tower machine characteristic of upper-circumgyrating, horizontal arm and variable range with small cabin. The lifting moment is 800KN.m, and the maximum lifting power is 8t. When independently installed, the maximum lifting height can reach 45m, and with attachments the lifting height can reach 180m. The maximum range of it is 56m.