Talk:Tunnel boring machine

message: I redirected "bore tunnel" and "deep bore tunnel" here; they should be explained if not obvious. -- Beland (talk) 05:57, 22 May 2008 (UTC)
thread_title:  Vocabulary 

message: Are you sure that the largest diameter hard rock TBS was manufactured by The Robbins Company for Canada's Niagara Tunnel Project? It is only 14.4 mt diameter, whereas Martina, by the German company Herrenknecht and the Italian company CMA has a diameter of 15,62 mt. See  The world's largest hard rock cutter: Herrenknecht TBM S-574 "Martina" 07/22/2011. --Dejudicibus (talk) 14:47, 26 December 2012 (UTC)
thread_title:  Martina 

message: Added a reference to the new TBM being used in Seattle, which many sources claim to be "the world's largest." However, it's not clear in which category that might be true.  — Preceding unsigned comment added by 130.76.32.40 (talk) 00:22, 18 June 2013 (UTC)
thread_title:  Seattle TBM 

message: Uranium's average concentration in the Earth's crust is  2 to 4 parts per million by weight with 0.7% fissile isotope U235. This works out to 21 ppb. When U235 is bombarded with neutrons, heat is liberated heating the surrounding mass and additionally three more neutrons produced for aiding the nuclear reaction. This technique can be used in hard rock tunnel boring to increase the pace of boring and decrease power consumption drastically.
The boring machine head can be fitted with low concentration uranium / uranium ore with neutron gun/generator. Every neutron hitting the U235 in uranium ore generate 3 neutrons which would be directed towards the hard rock to be excavated. When these neutrons hit the U235 (21 ppb present in the rock) they liberate heat locally inside the rock and create cracks due to thermal stress making the rock easier to break with hammers / cutters. The nuclear reaction further generates additional neutrons in the rock which would reduce the external supplementation of neutrons. 
Thus generating neutrons externally and directing in to the rock material will achieve rock cutting which may be better and faster method. May respond. 49.204.214.236 (talk) 16:13, 31 October 2013 (UTC)
thread_title: Tunnelling by nuclear fission heat

message: I'm sure that it varies a lot depending the material being bored and the machine itself, but—how fast do these things go? Is it meters per day, tens of meters, hundreds of meters, etc?  — Preceding unsigned comment added by 69.242.120.187 (talk) 23:31, 13 March 2015 (UTC)
thread_title:  Speed 

message: I'm sorry, but the TBM was NOT build, it was only designed, but the Orlovski tunnel was canceled (hope, temporarily), so the order to the TBM was canceled with the tunnel. Two 4-laned tunnels in 4th ring in Moscow were canceled too, so we have no project for the TBM now, maybe we will order it in a future, but we have many big transport projects in Moscow and St. Petersburg now, so we will have no money for the big tunnels in some next years. Of course, everything can change, but our present government don't look like people, who will start so expensive projects with so small profit for our highway system. Anyway, there is a fact, that the TBM wasn't build, it was only designed !!!
Please, correct the information, who is a native speaker of English - i don't want to correct the article with my mistakes.
PS if you have some questions about Moscow's tunnel projects, write me here, i'll visit the page in a near future and answer them. 78.24.28.186 (talk) 12:03, 6 July 2015 (UTC)
replies: text: Thank you. I was going to fix this earlier, but I couldn't find any sources that say the tunnel was cancelled. I also couldn't find any that said the TBM had been built. Kendall-K1 (talk) 14:44, 6 July 2015 (UTC)
replies: text: I can find and post here some information about the tunnels and TBM in Russian language, if you want (there were 2 other projects for the TBM in Moscow). I'm not sure, there are many information in English, because official information of Russian projects posts by Russian government in Russian, and usually it posts on governmental sites, which can be found only when you know where to look for them :(78.24.28.186 (talk) 16:37, 7 July 2015 (UTC)
replies: text: Does the sentence I added to the end of "Soft ground TBMs" look right? If there is a source in Russian, that is better than no source. Can you add it? Or post it here and I'll add it. Kendall-K1 (talk) 17:20, 7 July 2015 (UTC)
replies: text: the orlovski project was cancelled(http://lands-sale.com/real_estate/St_Petersburg_authorities_canceled_the_construction_42079),  — Preceding unsigned comment added by 124.157.111.67 (talk) 22:09, 29 September 2015 (UTC)
thread_title:  19.25 m TBM 

message: The tunnel-boring machines that are shown and discussed in this article employ a cutting head that consists of cutting wheels that are mounted in a rotating face plate.  However, the "History" section mentions only old machines that employed batteries of pneumatic drills.  The "History" section should be updated to include the origin of the modern TBM.  I'll try to do some research on the subject. VexorAbVikipædia (talk) 07:53, 25 August 2015 (UTC)
thread_title:  History ? 

message: I have removed the excessive usage of one group of authors/publications, that has been cite bombed in a thinly-veiled attempt to popularize these publications. Most of the added content was full of vague commonplaces and violated WP:NOTGUIDE - Wikipedia is not supposed to provide a "how to tunnel" handbook, or a platform to promote own views and research. GermanJoe (talk) 10:16, 30 December 2017 (UTC)
thread_title:  [[WP:CITESPAM]] removed 

message: These machines undoubtably require a lot of power, and the article is not complete until it addresses that aspect of the technology.
I assume most of the 19th-century machines were powered by coal-fired steam engines.  Do modern machines use diesel engines?  Here on the Talk page, the rumor of a nuclear-powered machine has been dealt with.  Still, it would be interesting if the article touched on the feasibility of a nuclear-powered TBM. 2601:281:CC80:5AE0:6C61:A3D5:53F0:BC31 (talk) 15:32, 8 December 2020 (UTC)
thread_title:  What is the power source? 

message: Insufficient  content  for  a stand alone article and unsourced Kudpung กุดผึ้ง (talk) 09:30, 13 April 2018 (UTC)
thread_title:  Proposed merge with [[Micro tunnel shield method]]