THE SEATTLE SAGA

摘要

Last Autumn, the world's largest diameter TBM was making significant progress mining below Seattle. It was quite possibly a mere week away from installing the 200th ring, marking the final manufacturer's hand-off, in December when tunnelling stopped, and has yet to properly resume. March 2015 is the most recent deadline for the TBM to start mining again. Stalled underground for six months, by the time this issue goes to print, there are still many questions about damage to the machine, repair work and the cost in both time and dollars to the project.