Charles River Tunnel

Description

TOTAL IMMERSED LENGTH: 146 m
DEPTH AT BOTTOM OF STRUCTURE: 12.3 m below MLW
HEIGHT: 6.86 m
WIDTH: 11.4 m
FABRICATION METHOD: Shipyard. Side launched.

Boston, Massachusetts,

United States

Sketch of cross section

Project Owner/client

Massachusetts Bay Rapid Transit Authority

Contractor

Steel shells by Wiley Manufacturing Co.

Contractor’s designer

Praeger Kavanagh and Waterbury

Length of elements

73m

Total immersed length

146m

Depth to underside of tunnel

12.3m

End date:

1971-05-07

Number of elements

Number of Lanes / Tracks

Two tubes; one track each

Height of elements

6.86m

Width of elements

11.4m

Unusual features

Selected as option to cofferdam method of crossing river. Transition sections in 29 m
dia compression ring cofferdam shafts.

Fabrication method

Shipyard. Side launched.

Outfitting

At dockside near tunnel site

Placing methods

Lowered from pile-supported structures.

Joints

Tremie joint

Waterproofing

Continuous steel shell.

Foundation Method

Screeded foundation course.