Pushing Back

by Brian Fortner, Contributing Editor; Civil Engineering Magazine, ASCE World Headquarters, 1801 Alexander Bell Drive, Reston, VA.,

Serial Information: Civil Engineering—ASCE, 2001, Vol. 71, Issue 6, Pg. A2-A9

Document Type: Feature article


(Available on in special edition) The design for the $3.5-million Cameron Run tunnel rehabilitation project involved a tricky and relatively unproven method of pushing corrugated steel liner plates in seven parallel flood control tunnels back into position. The tunnels pass through a fill embankment that carries two rail tracks about 30 ft (9 m) above the tunnels. The liners had deformed more than 1 ft (0.3 m) near the crown of the 20 ft (6 m) diameter tunnels. The method involved shoring the tunnels with steel sets, expanding the liner plates with a one-of-a-kind expanding device, increasing the diameter of the steel sets to meet the new tunnel profile, and applying structural shotcrete for support.

Subject Headings: Tunnels | Steel plates | Linings | Structural steel | Hydraulic design | Rehabilitation | Project management | Floods

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