When a 100 l.f. section of 72” CMP storm pipe collapsed just upstream of Towson University’s Johnny Unitas Stadium, the affected CMP was replaced with open-cut. The university next completed a full system inspection and, as a result, identified about 1,000 feet of nearly failing CMP in a downstream pipe directly underneath the well-known stadium, with no manhole access for almost 900 feet. The large diameter, high-flow pipe collects runoff from many square miles of densely paved urban area, including the University of Maryland’s St. Joseph Medical Center, and runs a couple of miles underneath Towson University to Lake Roland.
Towson University proactively engaged Whitney Bailey Cox & Magnani, LLC (WBCM) to explore rehabilitation options, manage the design, and perform quality assurance throughout the installation process. With a large stadium and about 30 feet of soil directly overhead, WBCM was looking for a structural, trenchless solution that would not compromise flow capacity and could be installed in long stretches of pipe with limited access. After considering and evaluating a variety of solutions, including cured-in-place-pipe (CIPP), sliplining, and centrifugally cast concrete pipe (CCCP), WBCM ultimately recommended CCCP.
One of the biggest obstacles the installation team faced was that the failing pipe fills nearly to capacity during storm events, so reducing the cross section could cause major flooding. This was complicated by the specified CCCP process calling for a self-consolidating fine aggregate composite concrete (FACC) to structurally reline the pipe interior, with the design criteria establishing a minimum thickness of 1” of centrifugally cast material and a total of 1.5” of material ultimately applied to ensure a fully structural result. However, while the total pipe diameter was reduced by three inches, the rehabilitated pipe has a significantly lower Manning’s n (a measure of pipe roughness affecting flow) than the previous deteriorated CMP. This ensures that overall flow capacity was not reduced and may have actually increased.
Join Forester University for this live, educational webinar as speaker Joe Cherry, Sales Manager at AP/M Permaform, uses this project as a case study for reviewing the pros and cons of various underground infrastructure rehabilitation solutions. He will cover the specific design, implementation, and quality control measures utilized at Towson University while teaching you how to evaluate situational criteria (such as structure diameter and length, depth of cover and live load requirements, soil envelope and voids, flow capacity requirements, environmental concerns, and space and access constraints), determine design requirements, and solve situational challenges for successful rehabilitation.
By participating in this webinar, attendees will:
- Receive best practice guidelines for assessing pipe and surrounding soil conditions as well as surface load and other considerations critical to successful rehabilitation
- Learn how to assess input from third-party engineers and licensed contractors
- Discuss criteria for evaluating available rehabilitation solutions based on situational requirements
- Understand specific design, implementation, and quality control measures for successful CCCP rehabilitation
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