Slip-Lining Solution

Sullivan, Dennis P.; ,

Slip-Lining Solution

by Dennis P. Sullivan, (M.ASCE), 59 Chesbrough Road, West Roxbury, MA 02132,

Serial Information: Civil Engineering—ASCE, 1993, Vol. 63, Issue 10, Pg. 74-76

Document Type: Feature article

Abstract:

Grouting the annular space between a corroded sewer pipe and newly installed liner pipe is a stage of a typical sewer line rehabilitation project which contains hidden problems and difficulties. Grouting is typically the final stage of the rehabilitation contract which provides the needed support around the newly installed liner pipe. The unanticipated problems associated with grouting the annular space for this needed support can lead to a considerable amount of additional money and time which could prove disastrous to contract work. The method of injecting the grout within the annular space is the primary factor for success. Large diameter plastic liner pipe (typically polyethylene) have strict pressure limitation due to its collapses potential. Grout can not be simply forced into place as typically performed in other methods of use. The original perception of specialized slipliner grouts having the ability to gravity flow within a restricted annular space was not as originally anticipated. Grout blockage within the annular space is a typical phenomena. A leaking annular space system is also a potential problem. Water testing and injecting highly diluted grout at rapid rates have proved to be the most successful alternative to assure grouting success. All of these suggested methods can be executed within the strict pressure limitation of large size diameter plastic pipe. This slipliner grouting solution evolved from extensive experimental testing that occurred on a sewer line rehabilitation project recently completed by the County Sanitation Districts of Los Angeles County.

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