On Stockton Street, we are using this machine to construct underground walls. The walls will be incorporated into the Union Square/Market Street Station. Note: Because of the July 4 holiday, this construction update covers construction impacts through July 15. We will not send a construction update email next Friday, July 5; however, we will provide […]
Crews are continuing to assemble tunnel boring machine Mom Chung. The black roll of ribbon is her conveyor belt, where spoils will be transported out of the tunnel. During the next 10 days, construction to prepare for tunneling will continue in SoMa and Union Square. In North Beach, Pagoda Palace demolition contractor MH Construction will perform […]
About 80 feet below Ellis Street, we’re installing pipes into the ground around this shaft. We’ll use the pipes to inject grout into the ground, improving soil conditions near the existing Muni and BART tunnels. During the next 10 days, construction to prepare for tunneling will continue in SoMa and Union Square. No Central Subway […]
Crews continue to prepare tunnel boring machine Mom Chung for launch. During the next 10 days, construction to prepare for tunneling will continue in SoMa and Union Square. No Central Subway construction is planned in Chinatown or North Beach. For descriptions of construction impacts in each neighborhood, click here or on the links below. We […]
A tour group visits tunnel boring machine Mom Chung beneath busy 4th Street. Tunnel boring machine Mom Chung is almost assembled and just about ready for launch. This summer, the 350-foot-long, 750-ton tunnel-building behemoth will begin her journey north beneath the streets of San Francisco, constructing the city’s first new subway tunnel in decades. Last […]
