Breaking News - Bay Tunnel breakthrough

January 18, 2013: The bored tunnel under the San Francisco Bay, the first ever, has broken through after a highly successful 5-mile drive by the Hitachi-Zosen EBPM and the Michels/Jay Dee/ Coluccio JV crews. The breakthrough after midnight on Friday 11 January, completed the drive in 16 months, a full 8 months ahead of schedule.
Congratulations to the JV, Hitachi-Zosen, and the SFPUC.

Construction begins on Bay Tunnel - TunnelTalk, Sept 2010
Hitachi EPBM for Bay Tunnel - TunnelTalk, Sept 2010
Bay Tunnel design - TunnelTalk, Mar 2008

Snapshot

Bay Tunnel breakthrough

Paula Wallis reports for TunnelTalk

Location:

San Francisco Bay

Dimensions:

Single bore, about 5 miles (8km) long, under the San Francisco Bay at depths ranging from 75ft to 110ft (22-33m), segmentally lined to 108in (3m) i.d. and finished with steel carrier pipes.

Type:

Water tunnel

Owner:

San Francisco Public Utilities Commission

Contract Value:

$215.3 million

TBMs:

Hitachi Zosen EPBM

Segment production:

Traylor Shea Precast, Stockton

Contractor:

Michels/Jay Dee/Coluccio JV

Designer:

Jacobs Associates

Construction Management:

Jacobs Engineering