First, use Hongda HDR200 large diameter rotary drilling rig is an efficient pile hole construction equipment, mainly for railway and highway bridges, public works bridge and large building construction such as foundation. The main technical parameters of the maximum torque of 200 kN.m largest hole drilling diameter 2m maximum drilling depth 60m maximum lifting force 210kN main hoist the main hoist winch maximum lift speed 76m/min maximum lifting force, Deputy Vice winch 98kN maximum lift speed of 60m / m