07 December 2012 ~ 0 Comments

Construction update: Subsurface wall construction underway at new SoMa location; construction paused in Union Square, North Beach

The tunneling contractor has begun installing below-ground walls to prepare for tunneling at this site on 4th Street between Howard and Folsom streets. Since our last update, construction in Union Square and North Beach has paused for the holiday season, while work at two sites in SoMa has continued to move forward. In addition, work […]

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19 November 2012 ~ 10 Comments

Construction Update: Central Subway construction during the holiday season

This construction site near Union Square will be restored and reopened to traffic during the holiday season. During the holiday season, construction at some currently active Central Subway construction sites will pause, with roadways and pedestrian walkways restored to regular use. At other sites, construction will continue. This blog post provides a summary of construction […]

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19 October 2012 ~ 1 Comment

Construction Update: Tunnel prep work progressing, full closure of 4th Street under I-80 overpass starting soon

This construction site on Stockton Street recently hosted an event to celebrate approval of major federal funding for the Central Subway. Tunnel pre-construction remains underway at four construction sites along the Central Subway Project alignment, including the site shown above, which last week hosted a ceremony to celebrate approval of federal funding to extend the […]

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05 October 2012 ~ 9 Comments

Tunnel Boring Machine Update: Photos of the Central Subway’s tunneling machines

The Central Subway’s two tunnels — one for northbound trains and one for southbound trains — will be constructed using state-of-the-art excavators known as tunnel boring machines (TBMs). For the past few months, TBM supplier Robbins has been busy building the Central Subway’s two TBMs — and we have photos of their progress. The Central […]

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27 September 2012 ~ 0 Comments

Traffic Alert: New traffic configuration starting Saturday in SoMa (4th Street between Harrison and Bryant)

The traffic configuration near this construction site in SoMa will be modified starting Saturday. Starting Saturday, September 29, a new traffic pattern will be established on 4th Street between Harrison and Bryant streets, at the site where tunneling will begin next year. To facilitate construction in the northwest and southeast sections of the block, vehicles […]

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07 September 2012 ~ 3 Comments

Construction Update: New traffic configurations in SoMa, North Beach as tunnel preparation progresses

This block of Columbus Avenue in North Beach is temporarily restored for traffic at the end of each work day. With autumn just around the corner, tunnel pre-construction continues to move forward in SoMa, Union Square and North Beach. As tunneling contractor Barnard Impregilo Healy JV completes work along the alignment, new traffic configurations are […]

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31 August 2012 ~ 1 Comment

Traffic Alert: New traffic configuration starting next week in SoMa

To avoid traffic congestion on this section of 4th Street, we suggest using the detours described below. As tunneling contractor Barnard Impregilo Healy Joint Venture continues to make progress on┬átunnel pre-construction work, traffic configurations at a construction site in SoMa will be modified next week, starting Tuesday, September 4. No Central Subway construction will occur […]

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06 August 2012 ~ 6 Comments

Utility relocation starting in North Beach on August 13

Central Subway construction will take place on this block of Columbus Avenue near Washington Square Park. Construction associated with the Central Subway tunnel will begin August 13 in North Beach. The work involves relocating utility lines on a half-block section of Columbus Avenue between Union and Powell streets. The Central Subway tunnel is planned to […]

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27 June 2012 ~ 1 Comment

Launch box construction proceeds in SoMa with cranes and specialized excavators now in operation

This video shows the work currently underway on 4th Street between Bryant and Harrison streets in SoMa. The full HD video can be downloaded here. It may look like a lot of dirt and mud right now, but in just a few years, what you see in the video above will become the Central Subway […]

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11 June 2012 ~ 3 Comments

Starting in SoMa: On 4th Street between Folsom and Howard, construction to prepare for tunneling

Construction is now underway on 4th Street near the intersection with Folsom Street. Construction to prepare for the installation of below-ground walls, called headwalls, has begun on 4th Street between Folsom and Howard streets, the site of the future Yerba Buena/Moscone Station.┬áThe work currently underway includes potholing and utility relocation. Headwall installation, which involves major […]

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