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- Bertha_(tunnel_boring_machine) abstract "Bertha is a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle. It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013. The name Bertha, after Seattle's only female mayor, Bertha Knight Landes, was chosen by a panel (that included the Governor and Transportation Secretary) from submissions from kindergarten through 12th graders, who were asked to submit female names with Washington state heritage.By December 6, 2013, Bertha had tunneled 1,019 ft (311 m), or 11%, of the total 9,270 ft (2,830 m) length of the tunnel, stopping about 60 ft (18 m) below ground between South Jackson Street and South Main Street. The machine's progress was halted on that day by an unexpected impediment. After a month's investigation, WSDOT announced that the machine's cutting blades had encountered an 8-inch-diameter (20 cm), 119-foot-long (36 m) steel pipe, one of several well casings left over from a previous 2002 drilling project that had assessed groundwater conditions and soil stability in the area in case of another earthquake, such as the 2001 Nisqually earthquake, which led to a need for the replacing of the Alaskan Way Viaduct in the first place. Because the machine cannot cut through metal, the pipe damaged several of Bertha's cutting blades, necessitating blade replacement before the machine could proceed. The pipes' locations were known to WSDOT and the agency thought they had been removed. It is unclear whether the state agency or one of its contractors is responsible for the left-behind pipes, as well as who is responsible for allowing the tunneling to proceed without their removal.In early February 2014, as Bertha was being prepared to resume operation, workers discovered it was overheating and that a damaged main bearing seal needed to be replaced. Multiple options were discussed to fix the problem, but Bertha was expected to be out of commission until March 2015. In December 2014, workers began digging a 120-foot-deep (37 m) pit in order to lift Bertha's front end up to street level for repairs, but were delayed when groundwater pumping caused visible damage to nearby South King Street and some of its neighboring buildings. The front end of the machine, including the damaged cutter head, was successfully lifted onto the surface on the morning of March 31, 2015. Seattle Tunnel Partners, the contractors overseeing the project, estimated that fixing Bertha would delay the opening of the new tunnel by an additional nine months to August 2017, which was later extended to March 2018 after additional damage was discovered in June 2015.On May 18, 2015, WSDOT reported to the Seattle City Council that the damage to the bearing sand seals was worse than had been previously reported. Further inspection after the cutting head was removed and disassembled showed damage to the cutter head drive gears, so a new estimate of the repair time and cost was being prepared.The front end of the machine was lowered back into the access pit for reassembly in a four-lift process beginning with the repaired cutter drive on August 24, 2015.In June 2015, Seattle Tunnel Partners sued to force insurers to payout on the $85 million insurance policy to cover repairs needed after Bertha's cutting teeth were damaged in a collision with a steel pipe in December 2013. In August 2015, a consortium of eight insurers filed a lawsuit against STP in order to avoid a $143 million payout to cover the cost of repairs to the boring machine. The insurers claimed that the tunnel-boring machine's capabilities were inadequate for the project and should be excluded.As of September 2015, Bertha had traveled 1,083 feet of its 9,270 foot path from SoDo to South Lake Union.".
- Bertha_(tunnel_boring_machine) thumbnail Front_of_model_of_tunnel_boring_machine_at_Milepost_31.JPG?width=300.
- Bertha_(tunnel_boring_machine) wikiPageExternalLink index.cfm?DisplayPage=output.cfm&file_id=10685.
- Bertha_(tunnel_boring_machine) wikiPageExternalLink 72157631880763139.
- Bertha_(tunnel_boring_machine) wikiPageExternalLink pickup008.html.
- Bertha_(tunnel_boring_machine) wikiPageID "41421736".
- Bertha_(tunnel_boring_machine) wikiPageLength "23235".
- Bertha_(tunnel_boring_machine) wikiPageOutDegree "39".
- Bertha_(tunnel_boring_machine) wikiPageRevisionID "706543370".
- Bertha_(tunnel_boring_machine) wikiPageWikiLink 2001_Nisqually_earthquake.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Alaskan_Way_Viaduct.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Alaskan_Way_Viaduct_replacement_tunnel.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Barge.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Beck_tunnel_boring_machine.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Bertha_Knight_Landes.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Bill_(law).
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Boondoggle.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Casing_(borehole).
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Category:Excavating_equipment.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Category:Transportation_in_Seattle,_Washington.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Elliott_Bay.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink File:Jumbo_Fairpartner,_Seattle,_April_2013.jpg.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Flickr.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Groundwater.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink HistoryLink.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Hitachi_Zosen_Corporation.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Jay_Inslee.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink List_of_Governors_of_Washington.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Osaka.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Port_of_Seattle.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Republican_Party_(United_States).
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Seattle.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Seattle_City_Council.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Seattle_Tunnel_Partners.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Sinkhole.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink SoDo,_Seattle.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink South_Lake_Union,_Seattle.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Tunnel_boring_machine.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Washington_State_Department_of_Transportation.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink Washington_State_Legislature.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink File:Bertha_TBM_retrieval_site.jpg.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink File:Front_of_model_of_tunnel_boring_machine_at_Milepost_31.JPG.
- Bertha_(tunnel_boring_machine) wikiPageWikiLink File:SR_99_Tunnel_Bertha_stuck_December_6,_2013.png.
- Bertha_(tunnel_boring_machine) wikiPageWikiLinkText "Bertha (tunnel boring machine)".
- Bertha_(tunnel_boring_machine) wikiPageWikiLinkText "Bertha".
- Bertha_(tunnel_boring_machine) wikiPageWikiLinkText "Big Bertha".
- Bertha_(tunnel_boring_machine) wikiPageUsesTemplate Template:As_of.
- Bertha_(tunnel_boring_machine) wikiPageUsesTemplate Template:Commons_category.
- Bertha_(tunnel_boring_machine) wikiPageUsesTemplate Template:Convert.
- Bertha_(tunnel_boring_machine) wikiPageUsesTemplate Template:Reflist.
- Bertha_(tunnel_boring_machine) wikiPageUsesTemplate Template:Twitter.
- Bertha_(tunnel_boring_machine) subject Category:Excavating_equipment.
- Bertha_(tunnel_boring_machine) subject Category:Transportation_in_Seattle,_Washington.
- Bertha_(tunnel_boring_machine) comment "Bertha, also known as Big Bertha, is a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle. It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013.".
- Bertha_(tunnel_boring_machine) label "Bertha (tunnel boring machine)".
- Bertha_(tunnel_boring_machine) sameAs Q16974131.
- Bertha_(tunnel_boring_machine) sameAs m.0zrpph_.
- Bertha_(tunnel_boring_machine) sameAs Q16974131.
- Bertha_(tunnel_boring_machine) wasDerivedFrom Bertha_(tunnel_boring_machine)?oldid=706543370.
- Bertha_(tunnel_boring_machine) depiction Front_of_model_of_tunnel_boring_machine_at_Milepost_31.JPG.
- Bertha_(tunnel_boring_machine) isPrimaryTopicOf Bertha_(tunnel_boring_machine).