STAF®0 pages

STAF®
A SELF-BORED TUBE SYSTEM FOR PRESSUREMETER TEST
According to EN ISO 22476-4 standard
The last born product of the research carried out by the
Engineers of Geomatech, the STAF® Self Bored Tube System
was developed to conform to the STDTM specifications spelled
out in the EN ISO 22476-4 Standard for Ménard
Pressuremeter® Testing, that is the Slotted Tube technique
with inside Disintegrating Tool and Mud circulation. This
equipment is particularly recommended to emplace the
slotted tube in non-homogeneous or overburden layers.
This drilling method may be carried out with any type of drilling rig, as long as it is fitted with a
hydraulic rotary percussion equipment (VibroSTAF® method) or a rotation head with
simultaneous double directions (RotoSTAF® method). Up to now, emplacing a slotted tube was
considered as a difficult operation, now it can be performed together while drilling, avoiding
borehole wall remoulding. This new technique brings a vast improvement to the operation and to
the geotechnical results.
Rotation head RotoSTAF®
A full STAF® equipment includes :
a string of pipes with the slotted tube, its driving head and
slurry circulation discharge pipe
a drilling set including drilling rods, couplings, bit holder and
STAF® bits, either buttons or cross
a probe with a set of rods
a rod pulling device
STAF® is a patented technique and a registered trademark of Geomatech.
ZA de Gomberville - 1 rue Salvador Allende - 78114 Magny les Hameaux - FRANCE
Tél : +33 (0)1 30 52 35 42 – Fax : +33 (0)1 30 52 30 28
info@apageo.com – www.apageo.com