In 2002, Crocker Ltd. installed 87 helical piers in preparation for an addition to the Leaden Hall School in the historic Cathedral Close, Salisbury, England.

There were several reasons helical piers were the ideal option in this setting:
•  The site is on the unstable flood plain of the Avon River.
•  It is a Roman Era archaeological zone and an English Heritage Site for which no excavation was budgeted.
•  No Portland cement was permitted.
•  Very low noise and vibration levels were essential.
•  Bearing had to be accomplished on a thin gravel bed overlaying a very deep layer of soft chalk.

	Hollow shaft 3.5" diameter piers were installed using hydraulically-driven equipment. Some of the piers were designed to carry loads of 60,000 pounds.
	Once installed, the pier shafts were cut off at the appropriate level.
	Spotting of the piers within very close tolerances allowed for the flawless installation of the steel substructure for the gymnasium and classrooms.