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“Central Subway”- Metro line 2 in San Francisco

San Francisco, California, Stati Uniti

2012 - 2014
CLIENT
City and County San Francisco Municipal Transportation Agency

CONTRACTOR

J.V. Barnard, Impregilo and Healy

DESCRIPTION
The project involved the underground extension of the current surface metro line which passes through the centre of San Francisco. The plan for this part of the project was to drill two parallel 2.6-kilometre tunnels for the passage of subway trains, as well as four stations. Exacvation was completed by '2 EPB Robbins with 6.4m diameter; The Italian group Salini Impregilo, its U.S. unit S.A. Healy and partner Barnard C.C.I. Salini Impregilo did the two tunnels, the preliminary work for the future stations, the entry ramp and the extraction well for the tunnel-boring machine (TBM). A biodegradable EP grease was specifically requested in the project specification, therefore the MAPEBLOX EP 2 ECO was chosen to lubricate the TBM main bearing.
  • MAPEBLOX EP ECO

    MAPEBLOX EP ECO

    Biodegradable EP greases for mechanized TBM tunnelling
    MORE INFO
  • POLYFOAMER FP

    POLYFOAMER FP

    High performance liquid foaming agent, based on
    biodegradable anionic surfact
    MORE INFO
37.7749300000,-122.4300000000
 
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