Adding Additional Reinforcement to Improve the Structural Performance of Spray Applied Pipe Lining Rehabilitation Technology: A Review

摘要

Spray applied pipe lining (SAPL) is a pipeline rehabilitation methodology that inhibits further deterioration and can support severely damaged storm water conveyance conduits, culverts, and manholes. SAPL can be a key strategy in extending service life and managing the future burden expected from the aging network of culverts and drainage infrastructures. Compared to other culvert rehabilitation methods, SAPL provides greater cost effectiveness and less community disruptions. SAPL application can renew deteriorated culverts prior to loss of soil-structure interaction. Adding reinforcement to the SAPL application improves its structural strength. The magnitude of bending moment which SAPL experiences due to the external loadings, such as live loads and dead loads, will determine the selection of reinforcement system(s). SAPLs for buried pipe structures are thin-shell structures having thicknesses typically ranging from 1 in. to 3 in. Additional reinforcement to these thin-shelled systems must fit within the typical thicknesses. The objectives of this paper are evaluation of reinforcement alternatives commercially available along with their potential performance enhancement capabilities and constructability used for SAPLs. This paper presents when, how, and how much additional reinforcement would be required if the load-response mode is found to be dominated by bending that exceeds the capabilities of the proposed SAPLs' modulus of rupture (or flexural strength).