Mixshield: Maximum safety in mixed ground.
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Mixshield: Maximum safety in mixed ground. - 1

NEW MILESTONE: BIG SUCCESS IN SHANGHAI. THE WORLD’S LARGEST TUNNEL BORING MACHINES CROSSED BENEATH THE YANGTZE RIVER. Herrenknecht AG D-77963 Schwanau Phone +49 7824 302-0 Fax +49 7824 34 03 pr@herrenknecht.com herenknecht A G | utility tuneling | Trafic tuneling china ww.herenknecht.com Herrenknecht AG is a technology and market leader in mechanized tunnelling. As the only provider of a full range of services worldwide, Herrenknecht delivers high-tech tunnel boring machines for all ground conditions and with all diameters – ranging from 0.10 to 19.0 meters. Herrenknecht’s tailor-made machines create pipeline systems for water and sewage, for gas and oil (Utility Tunnelling) as well as tunnelling systems for car, metro and railway traffic (Traffic Tunnelling) around the world. Our tunnel boring machines are forging ahead with the world’s longest railway tunnel and the largest metro lines. They help to cross under water with supreme accuracy and to lay pipelines throughout continents. Herrenknecht sees itself as a partner in teamwork tunnelling throughout the entire project. Comprehensive services for all aspects of tunnel boring activities complement our range. The Herrenknecht Group employs almost 2,500 people and includes 49 subsidiaries and associated companies working in related fields, e.g. in logistic solutions or deep drilling systems.

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Mixshield: Maximum safety in mixed ground. - 2

2 | 3 SHANGHAI GROWS: UPWARDS, OUTWARDS – AND DOWNWARDS. The People’s Republic of China is one of the most dynamic economic regions in the world. With its unprecedented growth, the country has already become the fourth largest economic power in the world. China has consistently promoted urbanization since the 1980s and it is one of the most important engines for growth on the Chinese market, along with the extension of infrastructure that goes with it. With its 20 million inhabitants, Shanghai is now the biggest city in China and one of the largest cities worldwide. This mega city continues...

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Mixshield: Maximum safety in mixed ground. - 3

October, 2007: S-318 best monthly performance of 510 meters December 18 and 26, 2007: S-318 best daily performance of 26 meters 4 | 5 The cutter exchange is carried out from the rear via accessible cutting wheel arms. Shanghai Changjiang under River tunnel 2 traffic tunnels for 3 traffic lanes each, service and safety facilities and a subway line Lengths: 7,470m each Interior diameter: 13,700mm each Geology: sand, clay, quarrystone, groundwater Maximum overburden above the tunnel axis: 65m Maximum water pressure: 6.5bar Client: Shanghai Changjiang Tunnel & Bridge Construction Development...

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Mixshield: Maximum safety in mixed ground. - 4

The Mixshield works on the so-called hydroshield principle: an unstable tunnel face is supported by a bentonite suspension – a mixture of clay and water. In this way, ground with high water permeability, mostly sands and gravels, can be driven through quickly and safely, without causing subsidence or heave on the riverbed. At the “stern” of the shield, the so-called tailskin, the tunnel is then seamlessly lined with specially manufactured, reinforced concrete elements (lining segments). The project: Shanghai Changjiang Under River Tunnel. Two superlative tunnel boring machines have...

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