PITTSBURGH, PA -
Tunnel boring under the Allegheny River began in late-2007 for the North Shore Connector. Trucks
carrying the largest components of the tunnel boring machine (TBM)
arrived in Pittsburgh on August 4th from Herrenknecht
AG in Schwanau, Germany.
Image: Port Authority
The 1.2 mile extension connects the existing
light rail transit system
(the "T") from downtown Pittsburgh to the North Shore, home
Heinz Field, Rivers Casino, the
Korean War memorial,
the Vietnam War memorial,
Rogers memorial and
The contractor for the tunnel project
North Shore Constructors, a joint venture of
Trumbull Corp., and
Obayashi Corp. of San
Francisco. Completion of the $435 million
project was originally scheduled for 2011, with actual completion
occurring in Spring of 2012.
Once assembled, the TBM was 200 feet long and weighed 350
tons. Approximately 35 feet of tunnel could be
bored daily. Twin tunnels were bored under the Allegheny River.
The first tunnel was bored from the North Shore to Pittsburgh.
The TBM was then hoisted and turned around so it could bore the
second tunnel back to the North Shore.
Tunnel Boring Machine (TBM)
Photo: Port Authority
T TRANSIT STATIONS
Three new transit stations
were constructed for the North Shore Connector:
Gateway Station -
Underneath Stanwix St between Penn and Liberty Ave in downtown
Video of a 'T' ride from the
to the Gateway Station in Pittsburgh
MAP OF THE NORTH SHORE CONNECTOR Image: Port Authority Transit
Lowering the TBM
November 29, 2007 photo
A Barnhart modular lift tower is used to lower the tunnel
boring machine into the ground. Barnhart had a similar tunnel
project in Atlanta.
Construction near PNC Park
September 23, 2007
Separation plant for excavated material created by boring
North Shore Connector
August 12, 2007
Subway construction near Heinz Field
Underpinning S.R. 65 bridge piers
Source: Port Authority Transit
Drilling a caisson next to a bridge pier
Site of future North Side Station
Forward shell of the Tunnel Boring Machine
TBM components awaiting assembly
North Shore receiving pit for the TBM
PNC Park and Pittsburgh in the background
Shore Connector News
Port Authority of Allegheny County Press Release August 3, 2007
Pittsburgh, PA – Trucks carrying the largest
components of the tunnel boring machine (TBM) that will construct
tunnels under the Allegheny River as part of Port Authority’s North
Shore Connector project are expected to arrive at West General
Robinson Street and Mazeroski Way on Saturday, August 4, 2007, at
approximately 9 a.m. and 11 a.m.
Shipments of smaller components of the TBM from the manufacturing
plant in Schwanau, Germany, via Belgium and Baltimore, began to
arrive in Pittsburgh last week. Most of the TBM’s components are
expected to arrive in Pittsburgh by Friday, August 10.
The TBM will be assembled on the construction site at West General
Robinson Street and Mazeroski Way and lowered into the launch pit
over the next two and a half months, with tunneling expected to
begin in late October or early November.