Setting up for the second drive, Amec took advantage of changes to the north Woolwich, London, site. The launch pit for the rst drive was cramped, forcing Amec to bury the TBM and then advance it in short steps as the rail-mounted gantries for segment erection, grouting and the muck conveyor were added behind. Initial mucking out was done by skip.
Over the past 12 months Amec has built a retained cutting to the wast of the launch pit, connecting to the rest of the DLR. This has enabled the whole TBM train to be laid out in a straight line, avoiding the need for start-stop tunnelling while kit is assembled.
Streamlining the launch process, combined with an accelerated ret of the TBM, has meant that Amec started its second drive only a month behind its original schedule.
Progress in the first week was 100m. South says that the second drive should be complete in August.