Retrievable Symmetric Drilling Tools with Casing Tube Page 04

  1. When the drilling starts. the central bit drive the ring bit down the hole, meanwhile the casing shoe and casing tube follow down together
  2. When arriving the bedrock, reversly rotate the tools and the central bit is pulled out from the hole.
  3. During pouring the concretes through the casing tube, pull out the casing tube with the ring bit synchroly.

 

 

Permanent Symmetric Drilling Tools with Casing Tube

  1. When the drilling starts, the central bit drive the ring bit down the hole, meanwhile the casing shoe and casing tube follow down together.
  2. When arriving the bedrock, reversly rotate the tools and the central bit is pulled out while leaving ring bit in the hole bottom.
  3. Pouring the concretes into the casing tube or move to next filed work process.

Overburden pic 1

Overburden pic 2

Overburden pic 3