Emergency Rehabilitation of a City of Atlanta 90-inch Concrete Trunk Sewer by Means of a Machine-wound, Spiral Pipe Renewal System Manufactured by Sekisui SPR Americas, LLC

Author: Vaccaro, Jonathan

Source: Proceedings of the Water Environment Federation, Collection Systems 2011 , pp. 759-765(7)

Publisher: Water Environment Federation

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Abstract:

Purpose of abstract: The purpose of this abstract is to show the capability and execution of the machine-wound, spiral pipe renewal system manufactured by Sekisui SPR Americas, LLC and how it was utilized in an emergency situation after the floods in the summer of 2009 in the Atlanta area.

Highlights of the Project: The Atlanta 90-inch trunk sewer is a cast-in-place sewer pipeline. Although it is referred to as a 90-inch pipeline, it is not circular. It is an arch-shaped pipe constructed with four individual pieces (Exhibit 1). The original construction allowed the concrete to be cast in place with cold joints. The pipeline is very shallow to the crown, and at points in the line it is above ground and exposed (Exhibits 2 and 3).

The sewer pipe typically runs at 50% of capacity. During rain events the pipe will take on excessive infiltration and surcharge. Combined with the extra flow from the flooding in the Atlanta area in 2009 and the lack of cover in some areas of the pipeline, the cold joints were detaching and allowing severe overflow.

Several external repairs have been added to the original host pipe on the areas that are above ground. Some of the previous repairs were not proving to be sufficient enough to stop the overflows (Exhibit 4).

The city of Atlanta assembled an emergency project team composed of Brown & Caldwell as the Engineer and Ruby-Collins as the General Contractor to complete a fully structural rehabilitation of this section of Atlanta's sewer infrastructure. The team decided to use Sekisui spiral-wound pipe renewal technology to permanently repair the host pipe to stop the overflows and damage to the pipeline that were occurring during heavy rain events.

The pipe length to be rehabilitated totaled almost 2200 feet. For 1200 feet, the crown of the pipe was exposed completely. Another 100 feet were on a golf course, and the remaining pipe had minimal depth of cover to the crown and was located in a residential area.

The city of Atlanta specified a minimum 50-year design life for the rehabilitated pipeline. Access to the pipe was difficult due to heavily wooded areas, private residence, and the golf course. Bypass of the existing flow would increase the cost of the emergency project for the city of Atlanta, which was already witnessing strains in its budget due to the flood's damage. Also, a small footprint was required for construction within the community to cause less disruption to the private residence. The project team spent a great deal of time meeting and discussing the construction activities with residents and homeowners associations to help minimize the disruption to their daily lives.

Sekisui SPR was the solution. An 84-inch circular, monolithic profile with dual locking mechanisms was machine wound into the host pipe to create a new pipe within the surcharging cast-in-place concrete. The construction started in the spring of 2010. The winding operation commenced on the pipeline in late summer 2010.

The contractor had many advantages by using the machine-wound method. It is environmentally friendly—no chemicals are released during installation. The carbon footprint at the work site was minimal (exhibit 5). No excavation was required for the SPR process. A fully structural design was given back to the city. The pipeline's flow capacity was minimally impacted and the monolithic profile used during the SPR winding process created an infiltration free, rehabilitated pipeline.

Completion: All work has been completed on the project since the fall of 2010. The SPR profile created new fully structural pipe inside the host pipe and has performed as designed.

Conclusion: The flooding of 2009 revealed a surcharge problem on an existing 90-inch trunk sewer in a private neighborhood in Atlanta. The budget was strained for the city, and the need for a rehabilitation project was dire. The project team was extremely satisfied with the Sekisui SPR product and its ability to offer a completely trenchless solution. The machine-wound, spiral pipe renewal process provided an alternative rehabilitation process to the city that was: environmentally friendly, truly trenchless, efficient and affordable, capable of installations with less disruption to the private residence and golf community, and capable of completing the long lengths of pipe that had minimal access points or manholes without excavation.
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