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Freighter Fairpartner carrying the disassembled tunnel boring machine into the Port of Seattle in April 2013. Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and was the world's largest earth pressure balance tunnel boring machine, [14] at a cutterhead diameter of 57.5 feet (17.5 m) across.
The State Route 99 tunnel, also known as the Alaskan Way Viaduct replacement tunnel, is a bored highway tunnel in the city of Seattle, Washington, United States.The 2-mile (3.2 km), double-decker tunnel carries a section of State Route 99 (SR 99) under Downtown Seattle from SoDo in the south to South Lake Union in the north.
Bertha, one of the world’s largest tunnel boring machines, emerged north of downtown Seattle on Tuesday.
The tunnel portal includes ramps to and from nearby streets, including Dearborn Street, Alaskan Way, and a frontage road along the east side of the highway. [14] The tunnel travels 1.8 miles (2.9 km) under Downtown Seattle and carries SR 99 along the central waterfront, running roughly parallel to the former Alaskan Way Viaduct.
The Alaskan Way Viaduct ("the viaduct" for short) [1] [2] [3] was an elevated freeway in Seattle, Washington, United States, that carried a section of State Route 99 (SR 99). The double-decked freeway ran north–south along the city's waterfront for 2.2 miles (3.5 km), east of Alaskan Way and Elliott Bay, and traveled between the West Seattle Freeway in SoDo and the Battery Street Tunnel in ...
This is a list of tunnels built in the city of Seattle, in the U.S. state of Washington. The Puget Sound region, where Seattle lies, has a history of glaciation that has left many hills and ridges that civil engineers have needed to traverse for transportation and utilities. [1] Some of these tunnels are part of megaprojects.
Bertha, the machine drilling the deep-bore tunnel, broke down in December 2013, leading to costly delays and significant challenges such as destabilizing soil conditions under Seattle's historic Pioneer Square and the Viaduct itself. [14] As of mid-2018, cost overruns on the tunnel project exceed $600 million. [15]
The tunnel, which will be 18 kilometers (11.1 miles) long, is one of Europe’s largest infrastructure projects, with a construction budget of over 7 billion euros ($7.1 billion).