60-inch Sanitary Sewer Interceptor Rehabilitation under Submerged Groundwater Conditions - Lessons Learned


60-inch Sanitary Sewer Interceptor Rehabilitation under Submerged Groundwater Conditions - Lessons Learned

Authors:

David Laughlin, P.E., Albuquerque-Bernalillo County Water Utility Authority, Albuquerque, NM
Melanie Sikes, P.E., Carollo Engineers, Albuquerque, NM
Mike Rocco, AUI, Albuquerque, NM

Abstract: The Albuquerque Bernalillo County Water Utility Authority (Water Authority) is in the fifth year of a 10-year Capital Planning Program to rehabilitate or replace sanitary sewer interceptor pipelines 15 inches in diameter and larger within the Water Authority's wastewater collection system. During the Program's inception, condition assessments were completed and projects that were identified were prioritized as part of a comprehensive Asset Management Plan. Since 2012, 2-3 sewer interceptor rehabilitation projects have been completed annually using a variety of rehabilitation techniques, including cured in place pipe (CIPP) and slip-lining, and in a variety of field conditions. A challenging project recently completed in February 2017 was the Barelas/Marquez Interceptor project, which involved slip-lining 2,500 linear feet of 60-inch reinforced concrete pipe sanitary sewer interceptor with 54-inch centrifugally cast, glass-fiber-reinforced, polymer mortar pipe. In addition, a total of seven (7) aging interceptor manholes were also rehabilitated with fiberglass inserts. Groundwater was encountered at a depth of 6 feet below grade, which created submerged conditions for the rehabilitation work. This presentation will discuss the construction techniques used to slip-line the pipe and rehabilitate manholes in submerged conditions, including the challenges with grouting the annular space, the methods used to maintain the access pits during slip-lining, the sealant techniques used for the manhole inserts, and the odor control equipment that was installed to eliminate gaseous odor transport between the interceptor pipeline and the interconnected small-diameter sewer collection lines.

Publication Date: 2018

Presented at:
NASTT’s 2018 No-Dig Show Palm Springs, California
March 25-29, 2018 | Paper Number: MA-T6-03


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