Time-lapse video: The first months of tunneling with TBM Mom Chung
Using time-lapse cameras installed underground, we’ve condensed the first months of tunneling into this captivating two-minute video. In the video, Central Subway crews assemble tunnel boring machine (TBM) Mom Chung and drive the state-of-the-art tunnel builder north under 4th Street to build San Francisco’s first new subway line in decades. The video shows the TBM assembly process, installation of the first tunnel rings, removal of excavated ground spoils and other aspects of the complex tunneling operation.
By the end of the video, Mom Chung has tunneled from her launch box south of 4th and Harrison to 4th between Folsom and Howard. Since we captured this footage, she has mined much farther north, crossing successfully and safely under Market Street and the existing BART and Muni tunnels last weekend.
We thank our tunneling crews and tunneling contractor Barnard Impregilo Healy for their hard work to build the Central Subway, extending the Muni Metro T Third Line through SoMa, Union Square and Chinatown. Stay tuned for more time-lapse videos as construction proceeds.
Links to the stations renderings on this page do not work…
Thanks for pointing this out! It appears our widget was broken — we’ll look into this and add it back soon. In the meantime, you can view station renderings on Flickr: http://www.flickr.com/photos/municentralsubway/collections/72157627927440324/
You are not updating the TBM Blogs. The last entry for TBM Mom Chung is December 04, 2013. I want to know where the TBMs are at a given time, but the information always seems to be 1-2 months old.
I have been told that at the Chinatown Station Site that Slurry Wall construction is being delayed because the engineers are making changes to the Station design. What changes are the Engineers making?