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 PortlandrnEast Side Combined Sewer Overflow Tunnel Project in Portland, Oregon, the slurryrntunnel boring machine (TBM) had to be returned from the Port Center shaft at SwanrnIsland to the Opera shaft at the main mining site for the 8,860-lf (2,700-m) South Tunnelrndrive. At Port Center shaft, the main 565-ton TBM and TBM tail shield were hoistedrnout of the shaft in two pieces using four 220-ton strand jacks mounted on a 700-tonrnhydraulic boom gantry system supported by Emmert International’s custom gantryrntracks designed to span the shaft. After lifting the TBM components out of the shaft,rnthe gantry system loaded the TBM components onto two Goldhofer platform trailers,rnwhich then transported the TBM and tail shield to a barge utilizing a roll-on/roll-offrnmethod. The barge transported the TBM and tail shield up the Willamette River backrnto the Opera shaft site where the process was repeated in reverse for re-installation ofrnthe TBM inside Opera shaft. This paper discusses the considerations for selecting thernmeans of transportation, the engineering and planning of the TBM transport, and thernlessons learned from this successful operation.