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MBTA, Russia Wharf Segment, Section CC03A

Owner:
Client:
Service:
NATM detailed design and site support
Estimated cost: Commencement:
December 28, 1996
Completion date:
December 19, 2004
Location:
Boston, MD
United States
Technical data:

Road tunnel with 2 lanes and a lenght of 400 ft. Study into the construction of either a single tunnel or a binocular tunnel with central pier using the shotcrete support method with ground freezing pre-support to protect overlying historic building.

Geology description:

Made ground, peat, glacial till (cohesive, plastic). The peat horizon undulates along the route, in places it is expected to be exposed in the top half of the proposed tunnel face.

Geology types:
Categories:
Bid cost: Final cost:
$18,000,000
Service areas:
Construction methods:
Tunneling under:
Groundwater control:
Description

The Russia Wharf segment is the last, but most challenging section of the Silverline Phase II construction for the Massachusetts Bay Transportation Authority (MBTA). The line is designed to provide a dualmode bus rapid transit connection between the central business district in South Boston to the new Convention Center. The tunnel passes diagonally under the 100 year old Russia Wharf complex, which comprises three seven-story buildings with steel frames and brick facades listed in the National Register of Historic Places. The chosen construction method was NATM in conjunction with ground freezing, for the first time in the US. The advantages are preservation of the buildings' historic value, undisturbed operation of the fully occupied buildings during construction, reduced impact on the building structure and comparable cost. The "binocular"-shaped tunnel passes just 10 ft (3 m) below the historic Russia Wharf. Minipiles and ground freezing will support the Russia Building while under the Graphic Arts Building, where cover between the tunnel crown and the pile caps is greater, freezing alone will provide the construction support. During excavation in the 2-6 m (6-20 ft) thick arch of frozen ground, about 600 of the building's old wooden support piles will be cut through. Once the ground is thawed, the cut-off wooden piles will rest directly on the tunnel lining, which provides the long term support for the building. The ground will be kept frozen during most of the 33-month construction period. Although the frozen soil will not support the buildings in some areas, the perimeter of the project will be kept frozen to inhibit groundwater infiltration. The construction sequence is defined by completing one tunnel first, including installing the PVC waterproofing system and casting the final tunnel lining and center wall. After the final lining achieves sufficient strength, the other tunnel will be excavated and connected to the finished tunnel lining.

 Overview of WEST COFFERDAM
Excavation of T.H. first round
Reflectors for the monitoring
4 Bar L.G.
Short tunneling
Steel pile for underpinning
Close up of L.G.
Convergence Bolt before schotcreting
Sheet Pile Wall
4 Bar longitudinal L.G.
Shotcrete at the face of T.H. & Bench
Installation of spiles
Spiles installed
Spiles installed
Wood piles
Installation of Spiles
Excavation of Invert
 Pile Shoe Reinforcement in T.H.
L.G & Wire Mesh installed
Butt plate connection
Butt plate connection
L.G & Wire mesh, Wood piles,Pile for underpinning
Wood files
Shotcreting, Pile for Underpinning
Overview of west Cofferdam
Overview of "Russia Wharf Building"
Overview of "Russia Wharf Building"
L.G & Wire Mesh, Pile for underpinning
L.G. installation
Pile Shoe reinforcement in T.H
View of tunnel and Graphic Arts Building
L.G. & Wire Mesh at Portal Area
Wood Piles, Pile for Underpinning
Compressible Pad onto wood piles
Wood piles, piles for underpinning
Profiling in T.H using Roadheader
View of "Russia Wharf Buildings"
Wood piles, Piles for underpinning
Shotcreting
Waterproofing at Invert, Water Barriers
Installed Waterproofing, Formwork for Center Wall
Installation of Rebar Spile
Installation of Rebar Spile
L.G & Wire Mesh installed, Shotcrete Invert in T.H.
Overview Tunnel Inside
L.G. & Wire Mesh, Piles for Undpinning
L.G. & Wire Mesh, Halfenbox
Shotcrete Tunnel completed
Grouting of Spiles completed
Waterproofing installed at Invert, Halfenbox
Reinforcement of center wall
Reinforcement of a Blockout in the center wall
Pouring concrete of Invert
Invert
Welding operation
Control & Grouting Pipe, Reinjectable Hose
Control & Grouting Pipe, Fuco Hose
Top of Centerwall
Reinforcement of Shotcrete
Installation of L.G. 1st round
Excavation of 2nd half of Binocular T.
Excavation of 2nd half of Binocular T.
Shotcrete F.L., Center wall
Binocular Tunnel
Installation of spiles
Freezing Pipes
Freezing Pipes
1st half of binocular T.
1st half of binocular T.
Pile shoe reinforcement in T.H.
Plan View of the Binocular Tunnel
Tower Crane View
Tower Crane View of Russia Wharf Complex
Tower Crane View of Russia Wharf Complex
Longitudinal Section for the Binocular Tunnel
Binocular Tunnel Section
Ground Freezing Tubes and Settlement Compensation under Russia Wharf
Top Heading Excavation cutting old wooden support piles
Reinforcing and Encasing cutted wooden Piles
Reinforcement of Middlewall of Binocular Tunnel
Excavation of the second Tube of the Binocular Tunnel
Waterproofing of the Binocular Tunnel
Freezing Pipes at surface
Shoe reinforcementon timber piles