A TBM named for Eliza Leggett, an active participant on the underground railroad, and later a suffragist, has been tunneling for the past 6 months on the massive I-75 reconstruction project in metropolitan Detroit. The […]
The Boring Company’s tunnel boring machine is nearly complete with the first half of the dual tunnel people mover system servicing the Las Vegas Convention Center. The secretive tunnel project is reported to cost $52.5M […]
After tunneling 9,270 feet under downtown Seattle, the Bertha tunnel boring machine finally broke through at the north portal yesterday. The breakthrough marks a major milestone in the project to replace the seismically deficient SR-99 […]
Every tunneling machine needs its cutting tools replaced every now and then. But the challenge is keeping a giant machine sharp while a wall of waterlogged earth looms in front. Welcome to the world of […]
The tunnel liner that is being placed by the Bertha tunnel boring machine consists of precast concrete segments. This video by the WSDOT shows how they are made at the casting yard, and what Bertha […]
This is an interesting video of crews changing cutterhead teeth on the Bertha TBM beneath downtown Seattle. [Source: WSDOT YouTube Channel. Image: YouTube]
This is a great video from WSDOT visualizing all of the geotechnical instrumentation and survey monitoring being done in Downtown Seattle above the Bertha TBM for the Alaska Way Viaduct Replacement project. Soldata is the […]
The Bertha tunnel boring machine has resumed chewing away beneath Seattle after a ‘suspension for cause’ order from WSDOT shut it down in January following two safety incidents. The BTM began tunneling with some conditions […]
The Bertha TBM creating the Alaska Way Viaduct Replacement Tunnel and the Seattle Tunnel Partners JV just can’t seem to catch a break. After being stopped for nearly 2 years to replace the entire cutterhead […]
The Seattle Tunnel Partners JV announced last month that tunneling on the Alaska Way Viaduct Replacement project will resume a month later than originally planned. The Bertha TBM will resume mining on December 23 after […]
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