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Application range

It is suitable for drilling water wells, geothermal wells, Micro piles, medium mini-type grouting hole of building, dam and harbor project.

Design principles

Make the casing follow easy and the equipment and operation simple.

Outstanding advantages

Simple structure, easy operation, reliable quality, retrievable drilling tools, and long service life. ecentriccase

A D G
Discharge Head DTH hammer Casing shoe
B E H
Drill rod Casing tube Reamer
C F I
Guide sleeve Guide device Pilot bit

 

Operation procedure

 
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1. As soon as the drilling starts, the reamer opens and enlarges the hole to drive the casing shoe and casing tube down.

2. When drilling in over-burden formation is done, start reverse circulation to close the reamer, and then pull up the assembly through the casing tube. 3. The casing tube can be left in the hole, or can be pulled out by means of grout sealing material. 4. Use the normal drilling tools to drill and achieve the desired depth.