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SFMTA’s Central Subway will connect San Francisco’s southeast neighborhoods to downtown and Chinatown. Whether you’re a concerned citizen, business owner, Muni customer, or just stumbled onto our blog, we welcome your questions and encourage you to connect with us. Follow us for the latest Central Subway news and information.

26 April 2016 ~ 0 Comments

2016 Station Construction Update

Here’s what you can expect to see as construction progresses along the Central Subway alignment.

 

4th and Brannan Station

Construction for the 4th and Brannan Station is progressing, and activity along the surface portion of the alignment will continue on 4th Street from Bryant to King. Utility work is expected to continue through 2016. The crew is working on a high pressure auxiliary water supply system on 4th between Brannan and Townsend. Two sewer lines will be installed on the east side of 4th and another will be reconstructed between Townsend and King.

To power the trains, an Overhead Catenary System (OCS) needs to be installed between Harrison Street and King Street. Installation of the OCS has three components: foundations, poles and wires. The foundations currently being installed are the bases for the poles. Once these are constructed, the poles will be mounted later in the year. The last step is the connection of electrical wires. These wires provide power to Muni’s light rail vehicles. The OCS work is expected to be completed in early 2017.

In the fourth quarter, crews are expected to begin trackwork and infrastructure installation in the tunnel.

Utility work continues on 4th Street

Utility work continues on 4th Street

Yerba Buena|Moscone Station

At Yerba Buena|Moscone, crews will be focusing on building the interior levels of the station box. The contractor will continue to excavate downward inside the station box from the mezzanine level to the concourse level. In the headhouse, crews will complete excavation and construct internal walls upward through the concourse, mezzanine and surface levels.

Most of the construction activity for the station is conducted underground. The mezzanine is under construction and is expected to be completed by June. Installation of steel supports is underway in the station box and the headhouse. Construction of the station box walls and flooring is anticipated to begin in the fourth quarter.

By December, it is expected that all four travel lanes will be open on 4th Street between Howard Street and Folsom.

Workers clean slurry walls before building internal walls

Workers clean slurry walls before building internal walls

Union Square|Market Street Station

For the Union Square|Market Street site, excavation is ongoing. Beneath Stockton Street between Geary and O’Farrell, excavation of the station box progresses. Excavation is being performed on O’Farrell Street  in order to install the final roof deck panels.

The demolition and restoration of the southeast corner of the Union Square Garage is underway. This area will become the north station entrance at Geary and Stockton. A portion of the garage wall will be demolished which will connect the entrance with the north concourse of the station.

Jet and compensation grouting are being performed on Stockton Street from Maiden Lane to Ellis Street. Jet grouting limits ground water from seeping into the station. Compensation grouting provides stability to the foundations of surrounding structures of the station.

Utility work continues at Geary Street and Maiden Lane.

Roof deck panels are being installed on Stockton Street and Geary Street

Roof deck panels are being installed on Stockton Street and Geary Street

 

Chinatown Station

In Chinatown, crews are excavating the north access shaft beneath Stockton Street between Washington and Jackson. This shaft will become an emergency exit stairwell for the station. Temporary steel supports have been installed in the headhouse to prepare for the next phase of excavation.

At the arched entrance way, crews are injecting grout to harden the soil where excavation will begin. This work reinforces the structure of the station. After the entrance way is excavated, “shotcrete,” a fibrous concrete material, will be sprayed onto the walls for stability. Excavation, waterproofing and rebar installation will continue through 2016.

A view of the archway entrance to the future station cavern

A view of the archway entrance to the future station cavern

 

 

22 April 2016 ~ 0 Comments

Project Advancement | April 22 – May 2

Utility work is performed in a trench on 4th Street

Utility work is performed in a trench on 4th Street

This notice provides a construction update and a look ahead for what to expect in the areas where we are building four new stations along the alignment. You’ll find information about work activities, traffic and transportation impacts taking place over the next two weeks at SoMa, Yerba Buena|Moscone, Union Square and Chinatown.

Construction of the Union Square|Market Street station is progressing. The demolition of the southeast corner of the Union Square Garage is nearly complete. Remodeling of the north station entrance is underway. Jet and compensation grouting are being performed on Stockton Street from Geary Street to Ellis Street. Roof deck panel installation is progressing on O’Farrell Street. Excavation continues at street level and below.

Construction schedules, bus routes, and stop locations are subject to change due to unforeseen conditions. Signs will be posted at affected stops to advise of service changes.

Our thanks go out to the businesses, residents, shoppers, commuters, and all those who are touched by the Project, for their continued engagement as we work to extend the city’s public transportation system.

The Central Subway Team

21 April 2016 ~ 0 Comments

Featured Photos – April 21

This week’s photos feature shots of scaffolding erected around the future Chinatown Station cavern entrance archway, where jet grouting and drilling operations are taking place.

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A worker climbs a scaffolding ladder at the northwest corner of the headhouse, that’s a fancy word for station entrance, where work is underway.

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A construction crew member reaches the bottom of the headhouse scaffolding, as a bulldozer continues excavation work nearby.

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If you would like to see more photos of project construction, check out our Flickr, updated weekly!

 

 

15 April 2016 ~ 0 Comments

Project Advancement I April 15 – April 25

Construction of the Yerba Buena|Moscone Station mezzanine floor is underway.

Construction of the Yerba Buena|Moscone Station mezzanine floor is underway

This notice provides a construction update and a look ahead for what to expect in the areas where we are building four new stations along the alignment. You’ll find information about work activities, traffic and transportation impacts taking place over the next two weeks at SoMa, Yerba Buena|Moscone, Union Square and Chinatown.

Installation of 36” and 48” sewer lines on the east side of 4th Street between Bryant Street and King Street begins on Monday, April 18. Hours of construction are 7a.m. to 4p.m. Two lanes of traffic will be open on the west side of 4th Street. Parking will be restricted on both sides of 4th Street.

Construction schedules, bus routes, and stop locations are subject to change due to unforeseen conditions. Signs will be posted at affected stops to advise of service changes.

Our thanks go out to the businesses, residents, shoppers, commuters, and all those who are touched by the Project, for their continued engagement as we work to extend the city’s public transportation system.
The Central Subway Team

14 April 2016 ~ 0 Comments

Featured Photos – April 14

This is what one might see above ground where utility upgrade work is underway at 4th & Howard —  construction workers, planks and heavy equipment.

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Here is a look at the work taking place underground, where construction crew members mix materials for the next phase of mezzanine floor slab construction.

Workers mix materials for the next phase of mezzanine floor slab construction.

 

An up close photo of a carpenter as he cuts wood for the next section of the station box.

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If you would like to see more photos of project construction, check out our Flickr, updated weekly!

13 April 2016 ~ 0 Comments

Featured Photos – April 8

An excavator operator dumps material removed from the station box at the access shaft south of Geary, on Stockton.

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Construction workers supervise excavation activity under Stockton Street.

Two men observe excavation activity under Stockton, south of Geary.

A view from inside the southeast corner of the Union Square Garage, as workers demolish floors to prepare for construction of the north station entrance.

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If you would like to see more photos of project construction, check out our Flickr, updated weekly!

 

 

08 April 2016 ~ 0 Comments

Project Advancement | April 8 – 18

A bulldozer excavates the Chinatown headhouse

A bulldozer excavates the Chinatown Station headhouse

This notice provides a construction update and a look ahead for what to expect in the areas where we are building four new stations along the alignment. You’ll find information about work activities, traffic and transportation impacts taking place over the next two weeks at SoMa, Yerba Buena|Moscone, Union Square and Chinatown.

Night work to install a high pressure waterline at the intersection of 4th Street and Townsend Street begins Monday, April 11 through Friday, April 29. Hours of construction are 7p.m. to 5a.m. Other activities include utility upgrades, overhead catenary pole foundation and the installation of an auxiliary water supply system.

Construction schedules, bus routes, and stop locations are subject to change due to unforeseen conditions. Signs will be posted at affected stops to advise of service changes.

Our thanks go out to the businesses, residents, shoppers, commuters, and all those who are touched by the Project, for their continued engagement as we work to extend the city’s public transportation system.

The Central Subway Team

01 April 2016 ~ 2 Comments

Project Advancement | April 1 – April 11

Demolition for the north concourse of the Union Square|Market Street Station continues

Demolition for the north concourse of the Union Square|Market Street Station continues

This notice provides a construction update and a look ahead for what to expect in the areas where we are building four new stations along the alignment. You’ll find information about work activities, traffic and transportation impacts taking place over the next two weeks at SoMa, Yerba Buena|Moscone, Union Square and Chinatown.

As construction progresses, traffic patterns will vary. Minor traffic changes have been implemented on O’Farrell Street and 4th Street. Motorists are advised to exercise caution while driving in these areas.

Construction schedules, bus routes, and stop locations are subject to change due to unforeseen conditions. Signs will be posted at affected stops to advise of service changes.

Our thanks go out to the businesses, residents, shoppers, commuters, and all those who are touched by the Project, for their continued engagement as we work to extend the city’s public transportation system.

The Central Subway Team

31 March 2016 ~ 0 Comments

Featured Photos – March 31

Workers install steel plating and trench shields prior to excavating a site near Freelon Alley to conduct utility relocation work on 4th.

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A site foreman directs workers during the excavation of a trench for sewer installation north of Townsend.

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As part on-going utility upgrades, workers continue to install a high-pressure water line along the west side of 4th street between Brannan and Townsend.

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If you would like to see more photos of project construction, check out our Flickr, updated weekly!

 

25 March 2016 ~ 0 Comments

Project Advancement |March 25 – April 4

Workers excavate on 4th Street and Brannan Street

Workers excavate on 4th Street and Brannan Street

This notice provides a construction update and a look ahead for what to expect in the areas where we are building four new stations along the alignment. You’ll find information about work activities, traffic and transportation impacts taking place over the next two weeks at SoMa, Yerba Buena|Moscone, Union Square and Chinatown.

Construction on the Union Square|Market Street station is progressing. On the north side of O’Farrell Street, crews are installing the final sections of roof deck panels. To prepare for north station entrance construction, the southeast corner of the Union Square Garage is being demolished. Below the street, excavation for the future station platform is underway.

Construction schedules, bus routes, and stop locations are subject to change due to unforeseen conditions. Signs will be posted at affected stops to advise of service changes.

Our thanks go out to the businesses, residents, shoppers, commuters, and all those who are touched by the Project, for their continued engagement as we work to extend the city’s public transportation system.

The Central Subway Team