... to the construction of bridge, railway, building and YTR/YTRD rotary drilling rig is a high-efficient piling machine applicable to ... Yutong Heavy Industries cover YTR260, YTR230, YTR200, YTR160, rotary drilling rig, YTR220, YTR150, rotary drilling rig with domestically-made chassis, YTRD300, YTRD260 ...