Searching for SR-99
BASF reveals new TBM soil conditioner
BASF has introduced MasterRoc®SLF 50, a new generation soil lubricant that the company says improves performance and increases tunnel excavation…
Seattle says goodbye to Bertha
Disassembly of the US’s largest tunneling machine is now complete. On August 23, crews lifted the final pieces of the…
Video of Seattle Tunnel Partners rotating Bertha's cutterhead
Commissioning of the SR-99 (Alaskan Way Viaduct Replacement) tunneling machine continues as Seattle Tunnel Partners (STP) prepares to resume mining….
Bertha's Supreme Court file grows as new TBM repair video is released
The Washington State Department of Transportation (WSDOT) says it expects to lose $78 million due to the two-year halt of…
Bertha's breakthrough lifts spirits in Seattle
Just before noon yesterday, February 19, a long-awaited plume of dust rose into the air on the SR-99 Alaskan Way…
STP releases animated video of repairs to the SR 99 tunneling machine
Seattle Tunnel Partners (STP) – the Washington State Department of Transport’s (WSDOT) design-build contractor on Seattle’s SR-99 Alaskan Way Viaduct…
Seattle Mega-TBM repair plan complete
Seattle Tunnel Partners (STP) has completed its repair plan for Bertha, the striken SR-99 Tunnel Project mega-TBM. The focus now…
STP releases Bertha's re-start schedule
Seattle Tunnel Partners (STP), the Washington State Department of Transport’s (WSDOT) design-build contractor on Seattle’s SR-99 Alaskan Way Viaduct replacement…
Damaged main bearing seal is source of Seattle's SR-99 shutdown
Seattle Tunnel Partners (STP) – Washington State Department of Transportation’s (WSDOT) design-build contractor for the SR-99 (Alaskan Way Viaduct Replacement)…
STP install wells in Seattle to facilitate inspection of TBM blockage
Seattle Tunnel Partners (STP), Washington State Department of Transportation’s (WSDOT) design-build contractor for the SR-99 (Alaskan Way Viaduct Replacement) Tunnel…
Alaskan Way (SR 99) TBM launch pit complete in Seattle
In Seattle, assembly of the mammoth 57.5ft (17.52m) Hitachi Zosen EPB machine ‘Bertha’ has begun in earnest, following the completion…