Steel liner plate shafts are commonly used in reasonably stable ground conditions to provide a clean, open shaft environment. The liner plate design takes advantage of the load-carrying strength of a circular structure, combined with the corrugated plates, to create a relatively lightweight structure that can be assembled with hand labour in the shaft bottom.
One 500 mm ring is comprised of about 6 panels and is bolted to the ring above as the excavation proceeds. The exterior is typically grouted to ensure the loading in circumferential. Steel ribs can readily be added to the interior if additional structural support is required.