founded 1975 founder martin herrenknecht headquarters schwanau germany key people martin herrenknecht president & ceo products tunnel boring machines revenue 1 286 million 2015 net income 39.3 million 2013 number of employees 4955 2015 divisions traffic tunnelling utility tunnelling vertical drilling rigs subsidiaries herrenknecht vertical gmbh maschinen und stahlbau dresden herrenknecht formwork technology gmbh website www.herrenknecht.com herrenknecht ag is a german manufacturer of tunnel boring machines headquartered in allmannsweier schwanau baden w rttemberg . it is the worldwide market leader for heavy tunnel boring machines . roughly two thirds of the 4 600 1 employees work at the company headquarters in the installation of hydraulic and electronic components is carried out as well as final inspection . approximately 300 work at three different locations across china . the company contains 82 subsidiaries around the world and has worked on 2 600 projects . 2 3 contents 1 history 2 products and services 3 criticism 4 references 5 external links history edit martin herrenknecht established the martin herrenknecht engineering company in 1975 . 4 this became herrenknecht gmbh limited liability company two years later with capital of 20 million euros . 5 by 1984 herrenknecht had opened its first subsidiary abroad in sunderland england as herrenknecht international ltd. 6 the company later acquired shares in maschinen und stahlbau gmbh of dresden in 1991 . following the merger of maschinen und stahlbau gmbh herrenknecht became a joint stock company ag in 1998 and expanded worldwide . at this time the name was also changed to its current form . to increase the capacity of the elbe tunnel in hamburg germany completed in 2002 the firm used a 14.20 m diameter tbm which was the largest in the world . 7 the famous gotthard base tunnel in switzerland used the firm s machinery and was completed in 2009 . eight 10 million tunnel boring machines were commissioned for the 13 miles of crossrail which is under london in 2011 . 8 the cutting heads are 6.2 metres across . in 2014 the company reported a record level of orders at 1.2 billion euros aided by the expansion of middle eastern and asian cities especially with new metro systems . 9 products and services edit the company works with the mining transport and energy sectors . it builds tbms for road railway metro and utilities construction . 10 in mining the firm offers a range of automation technology that includes underground vehicles conveyor belts and monitoring systems as well as shaft drilling equipment . 11 oil and gas pipelines fossil fuel exploration geothermal energy equipment and electricity tunnels make up its business with the energy industry . 12 its drilling rigs can reach 8 kilometers underground and its tbms range in diameter from 10 cm to 19 meters . 13 14 other services include tunneling personnel spare parts refurbishment installation rental and re use tbms . 15 as an international company 90 % of its sales are to the export market . 16 criticism edit herrenknecht has three offices in tehran iran and has a variety of operations in the country . the american government believes there is a maze of tunnels used to cover up the state s nuclear programme and although the firm s involvement is not known they have completed many projects in iran . 17 18 references edit our employees herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . facts & figures herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . company herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 09 . history herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . register portal . www.handelsregister.de . retrieved 2015 06 09 . filing history . beta.companieshouse.gov.uk . retrieved 2015 06 09 . http www.wf ingbau.de fileadmin inc pdf projects en fourth elbe tunnel.pdf pdf . www.wf ingbau.de . retrieved 2015 06 08 . external link in title help topham gwyn ; correspondent transport ; schwanau in . crossrail unveils german machines that will bore into the heart of london . the guardian . retrieved 2015 06 08 . zeitung badische . wirtschaft rekordniveau tunnelmaschinenbauer herrenknecht legt kr ftig zu badische zeitung.de . retrieved 2015 06 09 . tunnelling herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . mining herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . exploration herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . herrenknecht tunnelling systems usa inc. international pipeline exposition . internationalpipelineexposition.com . retrieved 2015 06 08 . facts & figures herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . services herrenknecht ag . www.herrenknecht.com . retrieved 2015 06 08 . herrenknecht baut die gr ssten tunnelbohrmaschinen der welt der bezwinger des gotthards . neue z rcher zeitung . retrieved 2015 06 08 . broad william j. 2010 01 05 . iran shielding its nuclear efforts in maze of tunnels . the new york times . issn 0362 4331 . retrieved 2015 06 08 . herrenknecht . www.unitedagainstnucleariran.com . retrieved 2015 06 08 . external links edit official website authority control worldcat identities viaf 173069482 gnd 6519091 9 retrieved from https en.wikipedia.org w index.php title herrenknecht & oldid 737503985 categories companies based in baden w rttembergcompanies established in 1975companies of germanyconstruction equipment manufacturersgerman brandshidden categories cs1 errors external linksofficial website different in wikidata and wikipediawikipedia articles with viaf identifierswikipedia articles with gnd identifiers navigation menu personal tools not logged intalkcontributionscreate accountlog in namespaces article talk variants views read edit view history more search navigation main pagecontentsfeatured contentcurrent eventsrandom articledonate to wikipediawikipedia store interaction helpabout wikipediacommunity portalrecent changescontact page tools what links hererelated changesupload filespecial pagespermanent linkpage informationwikidata itemcite this page print export create a bookdownload as pdfprintable version in other projects wikimedia commons languages deutschesperantofran aisportugu s edit links this page was last modified on 3 september 2016 at 07 01 . text is available under the creative commons attribution sharealike license ; 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