In Sheboygan County, Wisconsin a galvanized pipe had been installed
under the intersection of Lakeshore Road and Najacht Road in an
environment outside of the recommended resistivity (ohm-cm) ranges for
galvanized metallic coatings. Given this environment, the existing pipe
experienced rapid deterioration most noticeably in the invert and was in
need of either replacement or structural repair.
As the highway above was one of the main roads running through
Sheboygan County, the county was inclined to look into structural
repairs rather than expensive open trench methods that would require
road closures and detours. They consulted with Contech representatives
to come up with alternate solutions. Ultimately, Smooth Cor™
polymer-coated double-wall corrugated steel pipe manufactured by Contech
was chosen to reline the host pipe. It provided the necessary
structural integrity needed during the installation process as well as
the required hydraulics and service life the County desired for a fully
structural repair. Smooth Cor is fabricated from polymer coated
galvanized steel coils meeting AASHTO M246 specification.
Upon arrival to the site, the pipe was pulled into the host pipe by
the County and grouted into place. They were able to keep a single lane
of traffic open during the entire construction process which provided
great cost-savings as well as little impact to the traffic along the
busy highway above.
Sheboygan County's Surveyor and Highway Engineer, Edgar Harvey, Jr.
RLS/SE commented, “Relining this structure avoided conflicts with a
sanitary siphon, a gas main, and other utilities which run under the
existing concrete aprons. It saved the expense of replacing the
apron-headwalls and allowed traffic to move through the site in at least
one lane throughout construction. The construction period was greatly
shortened. Environmental considerations were reduced, making permitting
easier. We expect many added years of service from the rehabilitated