equipment
This method was developed to increase drilling speeds and to reach greater depths in most formations. The bore hole is drilled by rotating a bit, and cuttings are removed by continuous circulation of the drilling fluid as a bit penetrates the formation. Drilling fluid is pumped down through the drill pipe and out through the ports or jets in a bit, the fluid then flows upward in the annular space between the hole and the drill pipe, carrying the cuttings and suspension to the surface. At the surface, the fluid is channeled into a settling pit or pits where most of the cuttings drop out.
The hand auger consists of extendable steel rods, rotated by a handle. A number of different steel augers (drill bits) can be attached at the bottom end of the drill rods. The augers are rotated into the ground until they are filled, and then lifted out of the borehole to be emptied. A different auger can be used for each soil type. The hand auger is suitable for unconsolidated formations: sand, silt and soft clay.
The cone penetration test (CPT) is a common in situ testing method used to determine the geotechnical engineering properties of soils and assessing subsurface stratigraphy. The testing apparatus consists of an instrumented still cone having a tip facing down. The cone is attached to an internal still rode than can run inside an outer hollow rod, which itself is attached to a sleeve.
TDR2 is a lightweight and rugged, self-contained pile integrity testing system. This highly versatile pile integrity test system can be used to test pre-cast concrete, cast-in-place concrete and timber piles of varying dimensions. TDR2 can locate anomalies including shaft restraints, over-break, cracks, reductions in sections and zones of poor quality concrete. This innovative system can also measure pile length, pile stiffness and mobility to further assess concrete quality and pile section.