SR-92 Highway Drainage
ACPA 2010 National Project Achievement Award Winner SR-92 Highway Drainage, Lehi, UT Geneva Pipe is extremely proud to be a part of the efforts by this award winning UDOT, CH2M Hill, Flatiron and Harper team. Our congratulations go out to the entire team on this $148 Million Road Project that contained approximately 12 miles of concrete drainage pipe. S.R. 92 is the main east-west corridor for the rapidly growing, northern Utah County suburban communities of Alpine, Highland, Cedar Hills, and northeastern Lehi. This area, located between Salt Lake City and Provo, has thousands of vehicles traveling this corridor every day. In order to improve mobility, a portion of roadway is being reconstructed and widened as an expressway, in which commuter lanes will provide more direct access to I-15 without signalized intersections. An expanded trail system was also an intricate part of this project. SR-92 Drainage: Approximately 12 miles of precast concrete pipe - pipe lengths include: - 9,000 feet of 72” RCP - 7,000 feet of 66” RCP - 4,500 feet of 60” RCP - 3,500 feet of 42” - 54” RCP - 4,000 feet of 36” NRCP - 3,500 feet of 30” NRCP - 12,000 feet of 24” RCP/NRCP - 24,000 feet of 18” NRCPUse of New Technologies: One major part of this project was construction of a 72-inch Class V reinforced pipeline under I-15. This nearly 300 foot section was constructed with direct pipe jacking. The pipe was wet cast, for improved outer smoothness, with Self Consolidating Concrete (SCC). The pipe also used steel end rings to better control horizontal and vertical alignments. The finished grade of the jacked pipe was constructed to within 0.02 inches of the design grade, showing that concrete pipe can be jacked without needing an exterior casing. Cost Effectiveness: Much of the pipe from 18-inch to 36-inch diameter was non-reinforced concrete pipe (NRCP). Nearly 8 miles of the pipe on the project was NRCP. UDOT specifications typically called out smooth line pipe in smaller diameters which allows contractors to select from different alternate materials. In this case NRCP was chosen by the contractor for its cost when compared with other alternatives. Post installation testing must be considered when evaluating overall cost effectiveness. In this case, concrete pipe’s ability to meet UDOT test requirements was a major consideration in selecting concrete pipe. Innovation: As this project was a design build project, innovation that allowed lower costs was considered. The designer and contractor chose to use in-line concrete tees in lieu of manholes or cleanouts in many circumstances. These underground junctions for 66-inch and 72-inch pipe were manufactured by Geneva Pipe to save money and provide convenient locations for future maintenance. Complexity: While Geneva Pipe is a short distance from the project, coordinating the manufacture of 12 miles of concrete pipe during a DESIGN/BUILD process is a major undertaking. Project plans were in-flux during the process requiring immediate coordination between designer, contractor and manufacturer. Keeping ahead of the contractor with the right sizes of pipe was critical.