City of Houston
As a result of the devastating effects of Hurricane Harvey in Houston, the primary sanitary sewer system of the emblematic Texas Medical Center was severely impacted. Two enormous cave-ins were produced; one collapsed at a rectangular sanitary sewer concrete box of 60” wide x 42” high x 33’ length underneath N. MacGregor Way and a 30” pipe segment underneath Braeswood Blvd.
Under an emergency response, the City of Houston and IPR South Central decided to perform the restoration of the sanitary sewer system through
two phases: The first phase was the reconstruction and rehabilitation of the concrete box sewer utilizing EcoCast Geopolymer lining method and the rehabilitation of 1,357’ of 60-inch diameter pipe using Cured-In-Place Pipe with reinforced fiberglass liner as the method of rehabilitation. The second phase was executed utilizing three technologies on the remaining deteriorated infrastructure.
Cured-In-Place Pipe (CIPP): CIPP was used for 15”, 18”, 30”, 36” & 48” diameter pipes at a total of 2,795 linear feet to increase the structural integrity of the liner.
Ecocast Geopolymer Lining: IPR identified a 193’, 48” with a transition to 42” pipe at 157’ from a downstream manhole. Two junction boxes and the 48” line up to the transition were perfect candidates for our Ecocast Geopolymer Lining.
Pipe Bursting: The second cave-in occurred on a 30” line segment at a sidewalk. Pipe bursting was the most efficient solution for this portion of the rehabilitation.
During both phases of the project, IPR also designed and executed its own 5,200 linear feet temporary bypass utilizing in-house crews.
After the first phase, IPR South Central, the City of Houston and Raghavender Nednur operated tirelessly. Each section presented unique implications and situations for the IPR team. For instance, due to a small infiltration found in two-barrel siphons, the CIPP section required a pre-liner install prior to the CIPP install. The EcoCast solution was selected because one section was located under a high trafficked and limited access area. Despite the multiple technologies performed, IPR was able to self-perform all the four trenchless pipe rehabilitation technologies on this project using in house crew and equipment and successfully rehabilitation all the sections under the Texas Medical Center. After quality checks, the solutions were structurally sound, and the City of Houston could rest easy.