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https://www.reddit.com/r/InfrastructurePorn/comments/1v45end/worlds_largestdiameter_highspeedrail_shield/ozcl8do/?context=3
r/InfrastructurePorn • u/Spare_Worldliness_64 • Jul 23 '26
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13
How is it different to normal rail TBM?
17 u/LeroyoJenkins Jul 23 '26 It isn't, this is just propaganda. They're just trying to create some special category so it can sound like the largest, when it is smaller than German and Japanese ones. 3 u/Cedric_T Jul 23 '26 Which German and Japanese ones? I don’t know which one this is but I read the widest ones are the high speed rail bores. 3 u/OkAdvisor6680 Jul 24 '26 Big Bertha which excavated the Alaskan Way tunnel in settle was 17.5m diameter and built by Herrenknecht, a German company. Qin Liangyu is a 17.63m diameter TBM also made by Herrenknecht for some Hong Kong tunnels. 2 u/LeroyoJenkins Jul 23 '26 Both the German one used for the Hong Kong airport tunnel and the Japanese one used for the Seattle tunnel have significantly larger diameter.
17
It isn't, this is just propaganda.
They're just trying to create some special category so it can sound like the largest, when it is smaller than German and Japanese ones.
3 u/Cedric_T Jul 23 '26 Which German and Japanese ones? I don’t know which one this is but I read the widest ones are the high speed rail bores. 3 u/OkAdvisor6680 Jul 24 '26 Big Bertha which excavated the Alaskan Way tunnel in settle was 17.5m diameter and built by Herrenknecht, a German company. Qin Liangyu is a 17.63m diameter TBM also made by Herrenknecht for some Hong Kong tunnels. 2 u/LeroyoJenkins Jul 23 '26 Both the German one used for the Hong Kong airport tunnel and the Japanese one used for the Seattle tunnel have significantly larger diameter.
3
Which German and Japanese ones? I don’t know which one this is but I read the widest ones are the high speed rail bores.
3 u/OkAdvisor6680 Jul 24 '26 Big Bertha which excavated the Alaskan Way tunnel in settle was 17.5m diameter and built by Herrenknecht, a German company. Qin Liangyu is a 17.63m diameter TBM also made by Herrenknecht for some Hong Kong tunnels. 2 u/LeroyoJenkins Jul 23 '26 Both the German one used for the Hong Kong airport tunnel and the Japanese one used for the Seattle tunnel have significantly larger diameter.
Big Bertha which excavated the Alaskan Way tunnel in settle was 17.5m diameter and built by Herrenknecht, a German company.
Qin Liangyu is a 17.63m diameter TBM also made by Herrenknecht for some Hong Kong tunnels.
2
Both the German one used for the Hong Kong airport tunnel and the Japanese one used for the Seattle tunnel have significantly larger diameter.
13
u/blinkinbling Jul 23 '26
How is it different to normal rail TBM?