... -well drilling rig adopts large gantry frame which up and down is controlled by mechanical system, double hoist set, large ... construction of high-rise building, highway and road, ports, dams and large-diameter borehole piles and deep well drilling. Technical parametersDrilling ... mm)5001500Inner diameter of turntable (mm)500Turntable rotation speed(forward and reverse) (r/min)21.5, 38.4, 61Rated output ...