TR460 Rotary Drilling Rig is large pile machine . Currently , the large tonnage rotary drilling rig is widely used by the customers in the complex geology area . What s more , the large and deep hole piles are required in the across sea and across river bridge . Thus , according to the above two reasons , we researched and developed TR460 rotary drilling rig which has the advantages of high stability , large and deep pile and easy for transportation.