It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013. Tunnel boring began on July 30, 2013, with the machine originally scheduled to complete the tunnel in December 2015.OverviewBertha was a 57.5-foot-diameter (17.5 m) built specifically for the 's (WSDOT) project in ,. .
The name Bertha, after Seattle's first female mayor, , was chosen by a panel (that included the Governor and Transportation Secretary) from 150 submissions from kindergarten through 12t.
[pdf] Mine Master drill rigs (also known as underground drill rigs, master rigs or face drilling rigs) are primarily utilized in underground mines (hard rock & soft materials) and tunnel construction.
[pdf] On our online portal My Sandvik you can easily find parts prices and availability. You can also place orders or request quotations any time, any day. You can request a quote directly here on our web site. Specify which type of products you're interested in and we'll get back to you as soon as possible.
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