Trenchless Structural Rehabilitation of Non-Circular Pipe in Congested Utility Corridor of Commercial Business District

In 2013, the City of Fort Worth, Texas, installed approximately 1,000 LF of machine spiral wound PVC liner pipe for the structural rehabilitation of a 48-in. × 42-in. stone arch storm drain. Open-cut construction was not feasible due to the cost and impact to adjacent utilities and infrastructure in the Commercial Business District of downtown Fort Worth. This was the first application for this technology on a storm drain in the City. BGE, Inc. developed construction plans and specifications for a 50-year design life of the rehabilitated pipe. Three in-situ construction methods were prequalified: (1) machine spiral wound poly (vinyl chloride) (PVC) liner pipe; (2) cured-in-place thermosetting resin sewer piping systems (CIPP); and (3) structural geopolymer lining system. In August 2018, the City performed a CCTV pipe inspection of the rehabilitated section. This paper discusses prequalification of construction methods and contractors, review of the performance of the product after five years post-installation, and evaluation of the current state-of-the-art trenchless rehabilitation methods including those not considered or available in 2013.