- Published: Tuesday, 29 January 2013 13:45
- Written by CP Staff
Afailing 144-in. corrugated metal pipe tunnel in Lewiston, Maine, was replaced with a reinforced concrete pipe (RCP) structure using an innovative installation method. The contractor, Diaz Corp. of Jay, Maine, devised the method to avoid having to excavate the pipe in place under existing and proposed streets, highway ramps and a railway line, sometimes at depths of 45 to 55 feet. Diaz had the choice of either pulling (by winch) or pushing the concrete pipe in place over a distance of 1,048 feet. Either way, there would be no digging involved, and the project could be scheduled and carried out during winter conditions.