Rather than go through a complete replacement of a deteriorating
double-barreled structure with a box culvert, Bradford County,Florida began researching alternative rehabilitation methods. The
site in question was located adjacent to a busy lumber company and
experienced a significant amount of heavy trucking traffic. They needed
to find an effective solution with minimal road closures. Bradford County
determined that relining would eliminate the time, cost and safety
problems that would be experienced with a complete replacement.
Contech Engineered Solutions recommended a DuroMaxx® reline
solution. With its steel reinforced polyethylene profile - it would be able
to withstand the heavy loading requirements while maintaining the
necessary hydraulic requirements with a 120” diameter pipe and smooth
interior surface which provides a Manning’s “n” of 0.012.
Two runs of the DuroMaxx pipe were inserted into the existing,
dewatered, 144” diameter pipe for a total of 80 LF. The joints were
fusion welded to meet the watertight joint requirements of ASTM
D3212. Once the pipes were connected and placed onto the skids, the
contractor, Florida Engineered Lining, was able to slide the lightweight
pipe right in and begin the grouting process.
Using a grout having a fluid unit weight that didn’t exceed 70 pcf,
the contractor, Florida Engineered Lining, pumped the grout into the
annular space surrounding the DuroMaxx pipe at a rate of 100 cy/day.
With minimal traffic disruption and no road closure, Bradford County
was pleased with the ease of installation. The existing structure was
completely relined and grouted within one week.
John Fernandez with Florida Engineered Lining stated, “DuroMaxx slipline pipe went in so fast that it took longer to clean
and prep the host pipe than it did to install the liner.”