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Herrenknecht AG is a German manufacturer of tunnel boring machines, headquartered in Allmannsweier, Schwanau, Baden-Württemberg. It is the worldwide market leader for heavy tunnel boring machines. Roughly two-thirds of the 4,600 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. == History == Martin Herrenknecht established the Martin Herrenknecht engineering company in 1975. This becomes Herrenknecht GmbH (limited liability company) two years later with the capital of 20 million euros. By 1984, Herrenknecht had opened its first subsidiary abroad in Sunderland, England as Herrenknecht International Ltd. 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 14.20m diameter TBM, which was the largest in the world. 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. The cutting-heads are 6.2 metres across. In 2014 the company reported a record level of orders at 1,200 million euros, aided by the expansion of Middle Eastern and Asian cities, especially with new metro systems. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Herrenknecht」の詳細全文を読む スポンサード リンク
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