During tunnel construction, slough-ins and other concentrated loads are unpredictable and can be catastrophic without adequate protection. Our sufficiently stiff tunnel Liner Plate functions as a safety zone for workers and equipment. The required amount of liner stiffness depends upon soils, tunnel size and construction methods.

Bridges and large culverts can be relined by erecting our plate structures inside existing structures. Or, the new plate structure can be erected outside and threaded into existing openings. Our Plate Structures, including Two-Flange Liner Plate, are delivered to the job site unassembled. The plates and ribs are easily bolted together to form various shapes: round, vertical and horizontal ellipse, pipe-arch, underpass and arch.

Vertical shafts vary in diameter from a few feet to 50+ feet, and frequently have depths exceeding 60 feet. Whether microtunneling, slip-lining, and installing tunnels, maintaining shaft integrity requires a dependable support system. Our Liner Plate is unsurpassed in strength and safety. Once tunneling is completed, the liner plate is often dismantled and reused.