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Symmetric Drill Tools
Symmetric Drill Tools

  

Retrievable Symmetric Drilling tools with case tube drilling step-by-step:

1,When the drilling starts,the central bit drive the ring bit down to the hole,followed the shoe casing and casing rube.

2,When arriving the bedrock, reverse rotation of the tools and pull the central bit out from the hole, leaving the ring bit in the hole.

3,Pull the casing tube out with the ring bit and at the same time pour the concrete.

 

Permanent Symmetric Drilling tools with case tube drilling step-by-step:

1,When the drilling starts, the central bit drive the ring bit down to the hold, followed the casing shoe and casing rube.

2,When arriving bedrock,reverse rotation of the tools and pull the central bit out from the hold, leaving the ring bit in the hole.

3,Pour the concrete or do the next construction work.