
Project of The Year 2016 Rehabilitation Honorable Mentions
October 27, 2016
Rockland County Interceptor Sewer Rehabilitation


RELATED: NYSDOT Embraces Centrifugally Cast Concrete Pipe for Trenchless Storm Sewer Rehab
With a smooth pipe interior provided by the sheet steel inserts, the CentriPipe system was then used to cast a new, structurally sound, 1.5-in. concrete pipe that adhered tightly to the remnants of the original RCP sewer and the new sheet steel inserts. A total of three passes were used to cast this new pipe, and seamless manhole-to-manhole coverage was achieved.
ConShield, an anti-MIC concrete additive distributed by AP/M Permaform, was mixed onsite with PL-8000. Unlike coatings, ConShield provides integral anti-microbial protection throughout the concrete matrix for MIC prevention that does not fail as concrete wears.
Honeywell Stormwater Culvert Rehabilitation


Closed circuit television (CCTV) inspection results showed sometimes severe structural deterioration along with groundwater infiltration that had a tendency to form hard scale buildup around pipe joints that impeded proper flow and caused the drainage ditch, connecting laterals and drainage areas to flood. The most cost-effective and sustainable solution was to line the culverts with cured-in-place pipe (CIPP) to prevent future groundwater infiltration and pipe deterioration.
RELATED: Trenchless Under I-70: ODOT Project Calls for Saertex’s Largest UV Liner
The culverts were lined with UV-cured Saertex multiCom fiberglass S+ liners. Unlike traditional steam-cured liners, the UV-cured liners have shown resistance to site groundwater and have had no effect on first flush styrene levels. In addition to advancing the technical design process, this project included the complexity of installing the largest equivalent diameter UV-cured liner in North America. Traditional steam-cured liners were impractical because of the large size and elliptical shape of the culverts. In order to achieve the required liner strength, traditional steam-cured liners would be prohibitively thick to compensate for the ovality of the elliptical host pipe, thus inhibiting proper curing. UV-cured S+ liners are more than 10 times stronger than the traditional liners allowing for thinner liners that can be efficiently and effectively cured.
This story was compiled by the Trenchless Technology staff.