Drilling tools such as hollow stem augers are turned to the desired depth with a pilot bit blocking the off the auger ID. The pilot bit is pulled and a split barrel sampler (split spoon) is lowered. The drop hammer is then placed on top of the rod string and the number of blows to advance the sampler is counted. The pilot bit can then be placed back in the augers and the auger string advanced to the next testing depth.
Split tube soil sampling system manufactured under U.S. Patent 9,551,188. It is best practice to consult applicable ASTM standards when performing geotechnical investigations.
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