Load Carrying Capacity Evaluation of Circular and Pipe Arch Culverts Renewed with Elastomeric Polyurea Spray Applied Pipe Lining

摘要

Polymeric spray applied pipe lining (SAPL) is a trenchless technology renewal method that can structurally renew gravity storm conduits and culverts. Polymeric SAPL is a cost-effective method that compared with other trenchless renewal techniques accommodates complex geometries with robotic applications. This paper evaluates structural capacity of six large diameter fully deteriorated corrugated metal pipes (CMPs) renewed with various thicknesses of the elastomeric polyurea SAPL in both arch and circular shapes. These pipes are buried into a soil box under 2 ft of soil cover and are subjected to a vertical static load, simulating a truck load on a roadway. The structural capacity of these pipes is compared to show the impact of pipe shape on the load capacity of renewed culvert pipes. The results showed that the application of elastomeric polyurea SAPL can significantly increase the load carrying capacity of the fully deteriorated CMPs. In addition, it was found that the circular culvert can resist higher live load than their equivalent size pipe arch.