Tying Up Loose Ends: Rehabilitating the Downstream End of an Egg-Shaped Brick Interceptor Near Boston

摘要

The City of Revere, Massachusetts maintains and operates 99 miles of aging sanitary sewer pipes. After decades of neglect and deferred maintenance, the City embarked on a comprehensive rehabilitation program of their sewer collection system. The rehabilitation work included the lining of approximately 2,500 linear feet of a 100-year old, egg-shaped, brick interceptor that conveys 95% of the City’s wastewater flow. A majority of the interceptor was rehabilitated in the first phase of the program in 2011, leaving only the three most downstream pipe sections remaining for rehabilitation. The rehabilitation of these three crucially important sections of 36” x 40” brick trunk sewer included challenging constructability issues such as bypass pumping, pipe size changes between manhole access points, permitting and coordination with the local regional sanitary sewer authority and the Department of Transportation, as well as bad weather and tide cycles.This paper will detail the significant challenges faced by the City and contractors during the rehabilitation of the brick interceptor including unique access issues at the suction manhole, bypass pumping discharge coordination with the Massachusetts Water Resource Authority (MWRA) at the downstream manhole located in the middle of a tidally influenced waterbody, and traffic management and planning within a heavily traveled, state-owned, parkway critical for commuters heading into the City of Boston. This paper will also discuss design challenges such as selecting the proper rehabilitation products, pipe size changes without manhole access, deteriorating brick infrastructure with active infiltration, and thickness requirements for an egg-shaped, 25-foot-deep brick sewer pipe.