MWRD PIPE REHAB - EVANSTON
The project involves rehabilitating an existing interceptor sewer in the City of Evanston for the client the Metropolitan Water Reclamation District of Greater Chicago. The 7,000 Lf. of sewer under contract is a semi-elliptical cross section and of approximate 10ft. x 10ft. dimensions. The timeline for the project is November of 2006 to March of 2008. KENNY opted to rehabilitate by the slip-lining method consisting of inserting a smaller diameter new pipe into an existing larger diameter pipe and then backfilling the annulus with grout.
Three insertion shafts are required with an approximate dimension of 35 ft. Special equipment required to push the slip-line pipe is the Akkerman SL50-100 hydraulic jacking machine with a 60 ton pushing capacity and can operate while the sewer is flowing.
The original plan to clean the sewer by combination jetter and vacuum truck proved to be ineffective due to major mineral deposits in the vicinity of the manholes. Extensive hand work and pneumatic tools were required to complete the cleanup. Additionally a full by-pass pumping system was required consisting of 4 pumps ranging from diameter 6 ft. to 12 ft.
Currently, the first 2000 Lf. of slip-lining has been completed using HOBAS 114 ft. O.D. Reinforced Polymer Mortar flush reline pipe. Discovered conditions have prompted a revaluation of the original design and will most likely result in the installation of 108 ft. HOBAS pipe to be used for the remainder of the rehabilitation work