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Spiral Lining Solution For Indiana Culverts
Earlier this year, the Indiana Department of Transportation (INDOT) used spiral wound pipe liner to rehabilitate two failing culverts beneath Interstate Highway 64 (I-64) near Evansville in the southwest corner of the state. It was the first time this product and installation process has been used by INDOT.
The two 66-inch diameter corrugated metal pipes (CMP) were located on each side of a CSX railroad track under a bridge embankment which carries I-64 traffic over the railroad. One was 210-feet in length, the other 246 feet.
The culverts were installed in 1966 with concrete paved inverts added in 1996. A 2009 inspection revealed heavy rusting and pitting above the paved inverts, as well as several deflections in the pipes.
INDOT wanted to evaluate machine spiral wound lining as a possible alternative to HDPE slip lining for culvert rehabilitation in areas of limited access and/or limited right-of-way, said an INDOT spokesperson.
This location, he continued, was chosen due to the limited right-of-way access and the improvement in hydraulic capacity and efficiency of the machine spiral wound PVC liner due to a larger open-end area compared to a traditional HDPE liner. The largest solid wall HDPE liner that would have fit in the host would have been 48 inches outside diameter with 44.89-inch inner diameter (ID), or a 48-inch ID profile wall HDPE liner. The 54.5-inch ID spiral wound PVC liner offered the largest inside-diameter liner that could successfully be installed to provide the greatest possible hydraulic capacity.
Both culverts were relined with Sekisui SPR PVC machine wound spiral pipe, said Karl Bates, project manager/estimator with Indiana Reline, contractor for the project. Sekisui SPR utilizes a steel-reinforced, monolithic, interlocking PVC profile strip that is grouted in place with specified cementitious grout. SPR has the capability to negotiate bends and rehabilitate odd shaped pipelines because of the adaptability of the profile.
Because INDOT and CSX had virtually no experience with the installation of spiral PVC liner, the project began with preparation and submitting a quality control/quality assurance plan for the installation of the Sekisui SPR liner.
A job apart
The basic installation process is to position a winding machine at the base of an access point of the host pipe and spirally wind monolithic panels of PVC into the host pipe to form a continuous, low-weight, watertight liner with high stiffness.
Several factors set this project apart from typical spiral wound liner installations.