Civil and Building Engineering.

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Figure 4.2 A typical drilling machine and its associated equipment.

The drill rod fits inside the central pipe of the auger and includes a point that is in place while the auger is advanced. When the desired depth is achieved, the drill rod with the drilling point is removed, a sampling tube is put on the drill rod, the sample is taken by pushing or driving, and the desired sample is retrieved for testing. Alternatively, an in situ testing device, as described below, can be lowered with the drill rod. After testing at a particular depth, the drill rod with the drill point can be replaced and drilling to the desired depth can be done in preparation for the acquisition of the next sample or in situ data.