Archive | SoMa

18 April 2014 ~ 0 Comments

Construction Update | Apr. 19 – Apr. 28

During the next 10 days, Central Subway work will continue at sites in SoMa, Union Square, Chinatown and North Beach. This section contains brief updates about what is happening in each neighborhood. For more detailed information, click here or on the links below. We also post construction, traffic detour and Muni impact information on our […]

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28 January 2014 ~ 0 Comments

Second Central Subway TBM to pass under Market Street, BART this week

Tunnel boring machine Big Alma, shown here, will cross under BART and Market Street this week. This week the Central Subway’s second tunnel boring machine (TBM) will pass beneath Market Street and the existing Bay Area Rapid Transit (BART) and Muni Metro tunnels, crossing from SoMa and into Union Square. The tunnel, one of two being […]

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03 January 2014 ~ 1 Comment

Construction Update | January 4-13, 2014

Next week traffic modifications on Stockton between Geary and Ellis streets near Union Square will recommence to accommodate construction of the Central Subway Union Square/Market Street station. During the next 10 days, Central Subway work will continue at sites in SoMa, Union Square, Chinatown and North Beach. This section contains brief updates about what is […]

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13 December 2013 ~ 0 Comments

Construction Update | Dec. 14-23

Underground on 4th Street, two tunnels are now in construction. Here we see the entrances to both, beneath 4th and Harrison. During the next 10 days, Central Subway work will continue at sites in SoMa, Union Square, Chinatown and North Beach. This post contains brief updates about what is happening in each neighborhood. For more […]

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06 December 2013 ~ 0 Comments

Construction Update | December 7-16

Inside TBM Mom Chung, the new tunnel curves as it passes below Market Street. Our tunneling crews successfully and safely completed the crossing under BART last week. We completed an important construction milestone last week as our tunneling contractor and TBM Mom Chung successfully and safely tunneled under Market Street and the existing BART and […]

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04 December 2013 ~ 6 Comments

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 […]

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25 November 2013 ~ 0 Comments

TBM Big Alma Launches, Commencing Construction of Second Central Subway Tunnel

Tunnel boring machine Big Alma, shown here on the right, began tunneling under 4th Street. On the left is the entrance to the parallel tunnel being built by TBM Mom Chung. There are now two 350-foot-long, 750-ton tunnel boring machines mining under 4th Street to construct the Central Subway’s pair of parallel tunnels. Our second […]

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22 November 2013 ~ 0 Comments

Construction Update | November 23-December 9

Due to the Thanksgiving holiday, this update covers the next two weeks. Our next update will be on Friday, Dec. 6. Happy Thanksgiving from the Central Subway team! Near Union Square, Stockton Street part of Stockton Street is now reopened. In this shot, crews finish the paving and traffic striping. During the next 17 days, […]

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21 November 2013 ~ 0 Comments

First Central Subway tunnel boring machine to pass under existing BART, Muni Metro tunnels next week

In the operating cabin of TBM Mom Chung, two TBM operators monitor tunneling conditions provided from a variety of state-of-the-art instruments. Next week our first tunnel boring machine, Mom Chung, will pass beneath Market Street and the existing BART and Muni Metro tunnels, crossing from SoMa and into Union Square. The tunnel, one of two […]

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15 November 2013 ~ 1 Comment

Construction Update | Nov. 16-25

In the new tunnel, two crewmen watch as a cart approaches, carrying with it tunnel segments for TBM Mom Chung to install. During the next 10 days, tunneling and tunneling preparatory work will continue in SoMa, Union Square and North Beach. Work to prepare for station construction is continuing in Chinatown and northern SoMa. In […]

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