'Chip' Breaks Through

Billy Bishop Toronto City Airport Pedestrian Tunnel Project Progressing

TORONTO, Jan. 29, 2013 /CNW/ - 'Chip', one of the two tunnel boring machines being used to construct the pedestrian walkway to Billy Bishop Toronto City Airport, has completed one of the drift tunnels and broken through the tunnel's shaft wall on Toronto Island.

The Canadian-made tunnel boring machine was lowered into the tunnel shaft at the foot of Eireann Quay on January 10 and began drilling on January 12. Its twin, 'Dale', is currently beneath the Western Gap creating one of seven drift tunnels that will form the walkway's crown. 'Chip' will be returned to the mainland to begin work on the next drift tunnel.

The walkway crown will be arched and comprise seven smaller, interlocking tunnels (six feet/1.8 metres) designed to reduce the potential for water ingress during construction. These tunnels will be constructed to form an arched roof for the walkway. Three of the drift tunnels will carry city mains to the Toronto Islands.

The Toronto Port Authority is building a pedestrian walkway across the Western Gap to Billy Bishop Toronto City Airport. The 800-foot walkway will be completed in Spring 2014 and will be the only known pedestrian tunnel in the world that connects to an airport and sits beneath a body of water.

About the Toronto Port Authority (www.torontoport.com)

The Toronto Port Authority (TPA) owns and operates Billy Bishop Toronto City Airport, the Port of Toronto (Terminals 51 and 52), and Toronto's Outer Harbour Marina. In addition to moving more than two million passengers through the airport in 2012, the Port Authority provides transportation, distribution, storage and container services to businesses at the Port, and owns and operates Toronto's largest freshwater marina. The Toronto Port Authority was incorporated on June 8, 1999 as a government business under the Canada Marine Act as the successor to the Toronto Harbour Commissioners.

Image with caption: "'Chip' one of the two tunnel boring machines creating drift tunnels for the Billy Bishop Toronto City Airport Pedestrian Tunnel breaks through the wall of the island shaft. (CNW Group/Toronto Port Authority)". Image available at: http://photos.newswire.ca/images/download/20130129_C9509_PHOTO_EN_23110.jpg

Image with caption: "Rendering of Billy Bishop Toronto City Airport Pedestrian Tunnel construction sequence. (CNW Group/Toronto Port Authority)". Image available at: http://photos.newswire.ca/images/download/20130129_C9509_PHOTO_EN_23111.jpg

SOURCE: Toronto Port Authority

Pamela McDonald, Director, Communications and Public Affairs [phone] or [phone] (mobile), [email protected].