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Omaha Saves Combined Brick Sewers with Trenchless, Structural Rehabilitation


Two large (90-inch and 102-inch) brick combined storm/sanitary drains running parallel beneath a major intersection in an important industrial area of Omaha collapsed suddenly and spectacularly in 2016, stopping traffic for several weeks and necessitating an urgent, major structural rehabilitation.

The project’s intricate undertaking?

Structurally and cost-effectively rehabilitating the 100-year-old collapsing RCP and stacked brick combined sewer lines with minimal disruption to traffic and minimal confined space entry.

Join Forester University for this live, educational webinar as returning speaker Brian Culich, Midwest Regional Manager at AP/M Permaform, uses this project as a case study to teach you the specific design, implementation, and quality control measures for successful CCCP rehabilitation.

Read the details of this unique case study below, and sign up for this course today!

Project Details

  • The pipelines involved consisted of two sewers running in parallel, made of hand-laid brick at diameters of 7.5 feet and 8.5 feet, respectively.
  • Following the initial collapse, inspection revealed major degradation in an additional 55 feet of the sewer lines. Near the area of collapse, the parallel sewer lines connected with additional large structures, including a 20’x20’ box culvert, gate valves, large (6-foot) incoming lines, and large retaining structures.
  • Voids above the structure revealed the bottom of concrete pavement overhead. Several decades’ worth of debris cluttered the area of concern and required removal prior to rehabilitation. Ace Pipe Cleaning Inc.—subcontracted to perform pipeline rehabilitation—employed confined space safety protocols and a dewatering scheme based on sandbag weirs, pumping, and weather monitoring to avoid “flash floods” caused by remote upstream storm events.
  • Work began with manual structural repairs to collapsed sections, including temporary plywood forms and concrete spray casting, to achieve structurally sound and circular pipe interiors. Structural rehabilitation was completed without trenching using CentriPipe, a centrifugally cast concrete pipe (CCCP) repair process that applies high-strength, fine aggregate composite concrete to pipe interiors with a spincaster, leaving smooth, even surfaces and a structurally sound pipe independent of failing substrates
  • The material used adheres well to difficult surfaces like brick and can be applied in thin layers. In this case, the material was mixed with ConShield—an anti-microbial concrete additive—at the time of application, providing permanent and integral protection for a pipeline that had been exposed to sulfuric acid produced by microbe colonies in a sewer system containing organic matter.

Learning Objectives 
By participating in this webinar, attendees will:

  • Evaluate available combined storm and sewer pipe rehabilitation solutions for planned and emergency projects
  • Become aware of design considerations for assessing pipe and surrounding soil conditions as well as surface load and other considerations critical to successful rehabilitation
  • Understand specific design, implementation, and quality control measures for successful CCCP rehabilitation
  • Learn why combined sewers are subject to microbiologically induced corrosion and how to address it

Train Your Team
Get the whole team trained! We offer additional savings if you register as a group. For group pricing information, contact us at

* Presentations are scheduled for approximately one hour with a 15-20 minute question and answer session to follow. Presentation may exceed scheduled time.
* Each state and certification agency has different requirements; it is your responsibility to know what they are. Note that 1 PDH = 0.1 CEU.
* Purchase of this course allows you access to the presentation(s) for 6 months from the order date.

On-Demand Webcast
Session: 1 H 30 M
Lectures: 1
Credits: 1 PDH / 0.1 CEU

On-Demand Webcasts > Erosion Control ($79.00)


Special Group Pricing Available


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