Bertha Launch Pits Become Tunnels

ENR Northwest » The launch and exit pits created for tunnel-boring machine Bertha in Seattle are in the last phase of being transformed into parts of the multilevel roadway that replaces the Alaskan Way Viaduct. Here’s how the process works.

2017-10-12T09:36:16-08:00October 2nd, 2017|Alaskan Way Viaduct, Design-Build, Highways, Washington|

Video: Bertha’s journey under the streets of Seattle

The Seattle Times » A 360-degree video shot inside the tunnel being built beneath Seattle gives viewers a unique new perspective of what it’s like to bore a 2-mile tube and construct a highway 200 feet underground.

2017-06-28T13:46:23-08:00March 10th, 2017|Alaskan Way Viaduct, Design-Build, Roads, Washington|

Bertha veers a few inches off course, stops digging

The Seattle Times » The massive drill has veered a few inches off course.

2017-06-28T14:42:19-08:00March 1st, 2017|Alaskan Way Viaduct, Design-Build, Roads, Washington|

Video: How a double-deck highway is built inside the Seattle tunnel – with enough concrete to fill 9 football stadiums

GeekWire » The Washington State Department of Transportation (WSDOT) takes viewers on a behind the scenes construction tour of the new double-deck State Route 99 tunnel. WSDOT’s Deputy Administrator explains how the tunnel boring machine, known as Bertha, works to dig through the ground and place concrete rings to form the tunnel wall as she goes. Watch as the tunnel takes shape and construction crews build the framework and pour concrete for the roadway. It is estimated the new tunnel will use enough concrete to fill nine football stadiums. Click here for the video.

2018-02-05T17:00:53-08:00July 14th, 2016|Alaskan Way Viaduct, Design-Build, Roads, Videos, Washington|

A video of the difficult work of changing Seattle tunnel machine’s cutting tools

GeekWire » Seattle Tunnel Partners (STP) has released a video of construction crews performing routine maintenance on Bertha, the tunnel boring machine, which includes power washing the cutting head and replacing cutting tools that weight 75 pounds each. Bertha is outfitted with 700 cutting tools (or teeth). During this maintenance stop STP has inspected 400 teeth, replacing 25, and remains on schedule to resume digging at the end of July.

2017-06-30T10:06:46-08:00July 12th, 2016|Alaskan Way Viaduct, Design-Build, Roads, Videos, Washington|
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