Tire gantry crane, its main beam, outriggers, the whole machine adopts box structure, small wheel pressure, reliable performance. The trolley running mechanism adopts dolly 4 axle line 2 longitudinal tire dolly with hydraulic suspension. Full hydraulic drive, electro-hydraulic control. Trolley power supply device, large vehicle power supply device and other components. The tires can realize 909 steering, for field change operation, at the same time with 20 ° or 45 ° inclined line function.