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January 17, 2017

Bertha gets 250 new cutter bits

By JOURNAL STAFF

SEATTLE — Crews doing maintenance last week on the tunnel-boring machine called Bertha replaced about 250 cutter bits called scrapers.

The machine digging the replacement tunnel for the Alaskan Way Viaduct stopped over the holidays for some maintenance before traveling about 34 feet for this stop, which involves work under hyperbaric conditions.


 
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