What type of pile is created by driving a wood pile to ground level then attaching a steel beam to the wood. Driving is continued with a shell or mandrell to the desired depth. The shell is then removed and the shaft is filled with concrete.

What type of pile is created by driving a wood pile to ground level then attaching a steel beam to the wood. Driving is continued with a shell or mandrell to the desired depth. The shell is then removed and the shaft is filled with concrete.