TURN-KEY CONDITION ASSESSMENT AND REHABILITATION/REPLACEMENT SOLUTION FOR AN EFFLUENT FORCE MAIN

摘要

The City of West Palm Beach constructed approximately 6 miles of effluent force mains in 1974 extending from 23rd Street using 42" Pre-stressed Concrete Cylinder Pipe (PCCP) and from Congress Ave using 48" PCCP to the East Central Regional Wastewater Treatment Plant within the City. The force mains normally run below the prevailing water table or are subject to wetting and drying cycles and are generally now below multi-lane paved surfaces. The City had experienced failures and wanted a complete investigation into the cause and extent of any possible deterioration/distress while the force main remained in service. The City also wanted to get recommendations for a possible rehabilitation and replacement program.rnThe Pressure Pipe Inspection Company (PPIC) led a team comprising of Jordan, Jonesrnand Goulding (JJG), Jason Consultants and an excavation contractor to provide the City with a complete turn-key solution. This paper will discuss the methods used to determine the existing condition of the force main: Acoustic emission testing, historic H_2S readings, chemical dosing records, repair/maintenance records, local soil conditions, hydraulic model runs, as well as the stress and strain in the PCCP elements. Additionally, it will cover the recommendations made to the City for a rehabilitation and replacement program, and highlight the advantages of a turn-key solution.