Casing extraction during bored piling works.

I have done this procedure many times. Both ways have their ups and downs. If the casing is deep and must be cut out in joints, you must lay the vibrator down first. Even if it's not, laying the vibrator down with the casing can damage the vibro or the casing, making it unusable. Also, disconect on the ground is a pain. The only time I lay them down together is if the hole is so unstable that time becomes an element. I'd rather get the pile in the hole and worry about the vibro later than have to re-drill.

Hope this helps.

If it was necessary to use a vibrohammer to install the casing, It may still be necessary to use it to remove after the placement of sufficient amount of concrete to seal the offending part of the excavation.

In extremely sandy/wet areas we have gone to the point of requiring separate lifting devices(cranes) for the hammer and the casing. This method came into play when we lost a casing while trying to set down as a unit.