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- Bertha was a 57.5-foot-diameter (17.5 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle, Washington, United States. It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013. Tunnel boring began on July 30, 2013, with the machine scheduled to complete the tunnel in December 2015. On December 6, 2013, work was halted approximately 1,083 feet (330 m) into the planned 9,270-foot-long (2,830 m) route because of an unexpected impediment. It was thought that several cutting blades were damaged by striking a steel pipe that had been used to measure groundwater in 2002 around the Alaskan Way Viaduct. However, subsequent investigation revealed that portions of the main bearing seal system were damaged, causing the bearing to overheat during operation. Over the next two years, a recovery pit was dug from the surface in order to access and lift the machine's cutterhead for repair and partial replacement in 2015. Bertha resumed tunnel boring on December 22, 2015, but was stopped in early January 2016 after a tethered barge in Elliott Bay damaged nearby piers and a sinkhole opened near the project site. Governor Jay Inslee halted all work on the tunnel on January 14, 2016, citing concern over public safety after the sinkhole incident. Digging briefly resumed on February 23, but was halted again for maintenance and inspections before resuming full operations on April 29. Tunnel boring was completed on April 4, 2017, with Bertha's cutterhead breaking through into a disassembly vault at the tunnel's north portal in South Lake Union. In December 2015, WSDOT had estimated that the tunnel would be completed and open to traffic in early 2018. The estimate was revised in July 2016 to open in early 2019 with an estimated $223 million in cost overruns stemming from the two-year delay. Tunnel boring was completed on April 4, 2017, the final disassembled pieces of the boring machine were removed in August 2017, and the finished tunnel opened to traffic on February 4, 2019. Bertha's components were not reusable and were scrapped. (en)
- A Bertha é uma tuneladora construída no Japão pela empresa Hitachi Zosen para o consórcio Seattle Tunnel Partners (Dragados USA; ) para ser usada na obra da (SR 99) do (WSDOT) de Seattle - Washington. A Bertha é considerada pelo Guinness World Records de 2019 a maior tuneladora do mundo.
* Modelo da Bertha em Seattle c. setembro de 2012
* Paredes do túnel em janeiro de 2017
* Parte traseira da Bertha c. janeiro de 2017
* Mapa do traçado onde a tuneladora realizou a obra da SR 99 (pt)
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- A Bertha é uma tuneladora construída no Japão pela empresa Hitachi Zosen para o consórcio Seattle Tunnel Partners (Dragados USA; ) para ser usada na obra da (SR 99) do (WSDOT) de Seattle - Washington. A Bertha é considerada pelo Guinness World Records de 2019 a maior tuneladora do mundo.
* Modelo da Bertha em Seattle c. setembro de 2012
* Paredes do túnel em janeiro de 2017
* Parte traseira da Bertha c. janeiro de 2017
* Mapa do traçado onde a tuneladora realizou a obra da SR 99 (pt)
- Bertha was a 57.5-foot-diameter (17.5 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle, Washington, United States. It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013. Tunnel boring began on July 30, 2013, with the machine scheduled to complete the tunnel in December 2015. (en)
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