This CMAR project involved the rehabilitation of over 25,000 LF of existing 14- and 18-inch cement-lined DIP force mains. Scope of work included the mixed-method repair and rehabilitation of 24,626 LF of existing parallel 14- and 18-inch cement-lined ductile iron pipe wastewater force mains using HDPE slip lining trenchless technology and open-cut replacement. B&F evaluated different rehabilitation methods with the Town and Designer, ultimately selecting the HDPE slip line option. The team assessed the schedule and available methods of rehabilitation. Open cut was utilized to realign the utilities and install valves. The slip-lined area provided overall cost savings and significantly reduced the impact on the public.
B&F self-performed all the HDPE slip lining, HDPE fusion, DIP force main cleaning, open-cut replacement, access manholes, and vaults. B&F self-performed over 19,326 LF of 12.87-inch O.D. and 16.56-inch O.D. HDPE slip lining, as well as over 2,500 LF of open-cut replacement of standard 14- and 18-inch DR26 HDPE. This project also included the installation of three each 9- x 12-inch cast-in-place vault structures, six 96-inch access manholes, three each 3-way plug valves, 14 each slip lining concrete thrust blocks, and three each 90-degree concrete anchor blocks. In addition to the pipework, B&F performed all the mechanical cleaning on the existing DIP force mains using a progressive cleaning method of pigging, drag-scraping, and swabbing. Other scopes of work included the installation of ARV’s, removals, pavement replacement, slurry sealing, and a lift station bypass diversion for the project duration.
