TRANSPORTING A TBM THROUGH A LARGE CITY ON THE EAST SIDE CSO TUNNEL PROJECT IN PORTLAND, OREGON

摘要

Upon completion of the 20,340-lf (6,200-m) North Tunnel drive for the Portland East Side Combined Sewer Overflow Tunnel Project in Portland, Oregon, the slurry tunnel boring machine (TBM) had to be returned from the Port Center shaft at Swan Island to the Opera shaft at the main mining site for the 8,860-lf (2,700-m) South Tunnel drive. At Port Center shaft, the main 565-ton TBM and TBM tail shield were hoisted out of the shaft in two pieces using four 220-ton strand jacks mounted on a 700-ton hydraulic boom gantry system supported by Emmert International’s custom gantry tracks designed to span the shaft. After lifting the TBM components out of the shaft, the gantry system loaded the TBM components onto two Goldhofer platform trailers, which then transported the TBM and tail shield to a barge utilizing a roll-on/roll-off method. The barge transported the TBM and tail shield up the Willamette River back to the Opera shaft site where the process was repeated in reverse for re-installation of the TBM inside Opera shaft. This paper discusses the considerations for selecting the means of transportation, the engineering and planning of the TBM transport, and the lessons learned from this successful operation.