Concentric Casing Systems Application Range: It is recommended to drill in rock formation where contains some ovals and fractures. Design Principles: The stable and reliable working performance and the less vibration of drill rig. Different Structures: Concentric system with ring bits, wing and blocks. A: Discharge Head B: Drill Rod C: Guide Sleeve D: DTH Hammer E: Casing Tube F: Pilot Bit G: Casing Shoe H: R

With Ring Bits 1. When drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing tube. 2.At the bedrock, start Reverse circulation of tools and pull the pilot bit from the drill hole leaving the ring bit in the hole. 3. Pour the concrete or do the next constructions work. 1.After the drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing tube. 2. At the bedrock, start Reverse 3. Pull the casing tube out with the circulation of tools and pull the pilot ring bit and at the same time pour the...

Thickness Range Hammer Type Drill Pipe Range

With Wings Guide Device Operation Procedure 1. The wings swing out soon after the drilling start and the ream drives the casing shoes and tubes in the drill hole. 2. After completed the drilling process in overburden rock formation, as soon as the reverse drilling process start the wings will get closed, so the drilling tools can be pull back from the drill hole. 3. Follow the next drilling process. Thickness Range Hammer Type Drill Pipes

MAXDRILL R M ROCK TOOLS S CO., LTD www.max x‐drilling.com m Operation Procedure O 1. At the start of drilling, th blocks slid down thro he des ough the groo oves on nd rives the casi shoes and tubes into th drill hole. ing d he pilot bit, an the ream dr 2. 2 After comp plete the drilli process in overburden rock formations, raise ing n the drilling tools then the blocks will get closed th hrough the gro ooves, the led the drilling tools can be pull out from t drill hole. 3. 3 Next constr ruction can be followed. e A Thickness Range Pilot bit t with B Block Outer...