Big Bertha, the tunnel boring machine of Washington State Department

Bertha is a tunnel boring machine built specifically for the Washington State Department of Transportation’s Alaskan Way Viaduct replacement tunnel project in Seattle. Bertha has to build the SR99 tunnel under downtown of Seattle, in order to replace the old viaduct “Alaskan Way”. After some moments of pause for machine trouble and maintenance, Bertha is rolling again. The maintaining works have included the cutting tools change and other maintenance behind the cutterhead. Officials hope Bertha finishes by December.

Galbiati Group builds TBM components such as planetary gearboxes, bearing supports, erectors. The company has recently realized one 4 ton-segment erector for a Tunnel Boring Machine designed for a excavation project. For more information visit the website www.galbiatigroup.it.

2 thoughts on “Big Bertha, the tunnel boring machine of Washington State Department

  1. Pingback: Big Bertha, the tunnel boring machine of Washington State Department | webalive

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