28 December 2012 ~ 4 Comments

Central Subway construction to resume around Union Square on January 2

This construction site has been temporarily restored to traffic during the holiday season. Construction will resume here next week. Next week traffic modifications on Stockton and Ellis streets near Union Square will recommence to accommodate construction of the Central Subway tunnel. Beginning Wednesday, January 2, Stockton Street between Ellis and Geary streets will be closed […]

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17 August 2012 ~ 0 Comments

Construction Update: Tunnel preparation underway at four sites, Union Square utility relocation substantially complete

Tunnel pre-construction work is now underway on Ellis Street. The tall machine shown here on the right is used to perform ground stabilization work known as jet grouting. Tunnel pre-construction has continued to ramp up in recent weeks as tunneling contractor Barnard Impregilo Healy mobilized at two new sites along the project alignment: Around Union […]

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27 July 2012 ~ 0 Comments

Construction Update: Tunnel contract work starts next week in Union Square area

Construction of a major excavation known as a launch box is underway on 4th Street between Bryant and Harrison streets. At nearly 500 feet long, 50 feet wide and up to 40 feet deep, the launch box will take up most of the block. In the next three weeks, work to prepare for tunneling will […]

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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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15 June 2012 ~ 9 Comments

Construction Update: Launch box and headwall construction proceeding in SoMa, road restoration progressing in Union Square

Construction at the site of the tunnel launch box, shown here, ramped up this week.  Construction to prepare for the Central Subway tunnel ramped up this week, and the new sidewalks on the west side of Stockton Street are almost completely restored. Here’s what to expect in the next three weeks as tunnel preparation continues and the Union […]

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07 June 2012 ~ 1 Comment

Preparing for the Central Subway Tunnel: Major Work Commencing Next Week

At the site of the tunnel launch box, crews are constructing shallow, below-ground walls to prepare for the major upcoming excavation. Next year, a pair of tunnel boring machines (TBMs) will begin excavating the Central Subway tunnel, building the backbone of Muni’s extension of the T Third Line through vibrant and bustling SoMa, downtown, Union […]

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25 May 2012 ~ 1 Comment

Construction Update: Road and sidewalk restoration to commence near Union Square, utility relocation starting in SoMa

These walls, called guide walls, are being constructed at 4th Street beneath the I-80 overpass to prepare to excavate the site where the Central Subway tunnel will begin. In the next three weeks, road and sidewalk restoration are planned to begin along Stockton Street, and work associated with the tunnel contract is anticipated to commence […]

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07 May 2012 ~ 0 Comments

Construction Update: Utility relocation, tunnel site preparation continue to advance

Crews prepare to pour sidewalk on Stockton Street. Since our last three-week construction update, work to prepare the tunnel launch site for tunneling and to relocate utilities around Union Square has continued to progress. In the next three weeks, the following work will be underway: Union Square/Market Street Station Utility Relocation: Crews will continue to relocate utilities to […]

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13 April 2012 ~ 1 Comment

Construction Update: Continued progress on utility relocation, tunnel site preparation

A worker inspects a reinforced steel structure at a work site on Stockton and Market streets. Since our last three-week construction update, work to prepare the tunnel launch site for tunneling and to relocate utilities around Union Square has continued to progress. In the next three weeks, the following work will be underway: Union Square/Market Street Station […]

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