This video shows the 20RF driving 24m long 800mm diameter casings and H beams in a trial set up for the Shanghai Greenland Group. The goal was to prove resonance free vibratory hammers can drive and also extract casings without bringing up soil that could contaminate the construction site. The test was concluded successfully. As you can see in the movie the driving had compacted the soil which was resolved by back-filling the hole with some sand.