Through routine inspection, the City of Tempe discovered an exposed 18-inch vitrified clay pipe (VCP) sanitary sewer that was encased in reinforced concrete and spanned through a storm drain junction box. Over time, the concrete encasement around the sewer line had corroded and spalled off, which left about half of the sewer line exposed.
Dibble provided professional services to recommend a feasible, expedited solution and design repair options to prevent the pipe from additional damage and potential catastrophic failure. The Dibble team recommended using fiber reinforced polymer (FRP) to encase the sewer line to strengthen and protect it.
The spalled areas of the concrete encasement around the existing VCP were patched. The full length of the VCP in the junction box was externally reinforced with multiple layers of FRP. Dibble provided construction administration and special inspection services during the FRP installation.