STAF
The STAF®, Self Drilling Tubing System, is a pressuremeter drilling method of the STDTM type (Split Tube with Internal Disintegrating Tool and Mud Circulation) in accordance with ISO 22476-4. It is a new method that offers by far the best pressuremeter results in heterogeneous and loose soils.
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With STAF®, the drilling is realized by the eccentric tool followed by the tube column, with a diameter 1 mm upper the tubes diameter. Casing maintain the drilling walls during the whole operation (drilling and test).
This drilling system can be carried out with any types of drilling rigs as logn as it fifted with a hydraulic rotary percussion equipment (VibroSTAF® method) or a rotation head with a simultaneous double directions (RotoSTAF® method).
Up to know, emplacing a slotted tube was considered as a difficult operation, now it can be performed together while drilling, avoiding borehole walls remoulding.
EQUIPMENT
A PIPING set with a striking head, a shock-absorbing helmet, extended pipes, and an open-split pipe
A tool set consisting of rods and couplings with a tool holder and STAF® cross-head or button-head tools
A probe positioner with the appropriate rods
An extraction system for retrieving the pipes
THE BENEFITS
Certified to ISO 22476-4 and NF P 94110-1 standards
Unmatched quality of pressuremeter drilling in heterogeneous soils for qualitative testing
Directly cased drilling
No damage to borehole walls (tool withdrawal into the casing and test during retrieval)
Time savings by performing tests sequentially as the tool is retrieved
Recovery of drilling mud (savings in drilling fluid and visibility of soil sections)
Safe method for users (no external rotating parts)
Ease of use