Trenchless pipe bursting is a widely utilized technique for replacing sewer pipes. Ductile iron commonly used in sewer systems is one of the most challenging materials to burst and can present significant obstacles. Suitable equipment, careful planning and contractor experience are all critical to successful bursting operations.The case study featured in this paper examines how a contractor overcame multiple “worst case scenario” complications to complete a mixed-pipe burst through 370 feet of ductile pipe and truss pipe, upsizing it to accommodate newly constructed apartment complexes. Significant site congestion, including multiple 125-year-old oak trees that were to remain unharmed, left the contractor no alternative but to pull from the truss pipe end of the run which greatly increased the risks associated with bursting ductile iron.The DI pipe ‘stacked’ as feared, but the experience level of the contractor and expertise of the project team allowed the burst to be successfully completed to specification. The overwhelming complications of this unusually difficult job provide instructive insights to others who may encounter similar challenges on a pipe bursting project.
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