for the next
There is a trend towards ever-larger diameters in mechanized tunnelling – following the vision of subterranean multipurpose infrastructure. Applications include three-lane highways, combined road-metro routes with sewage schemes. Mastering XXL tunnel drives requires purpose-made TBMs to handle high groundwater pressure, mixed-face conditions and large volumes of excavated soil. Going larger and operating safer, step by step, is the pioneer’s art of progression.
Ready for new terrain
and setting benchmarks
Pressure conditions like those experienced by a deep sea diver at a depth of 80 meters. Mountains of muck that could almost be used to build a pyramid. Millimeter precision to create a new, multi-story traffic artery directly under a highway or river mouth. 300 tonne machines transported by road following an elaborate choreography. Record diameters “Made in Schwanau” have become an integral part of the tunnelling world.
Explore the benchmarks by moving the slider
Preconditions and safer features for
The next record diameter is always based on sound engineering experience from previous reference projects. The next step into the future always produces an innovation and pushes the limits of technical feasibility, without overstretching them at the expense of human safety and the sustainable quality of the structures.
Real power and strong torque
- Greater thrust
Santa Lucia: 411,500 kN
- Stronger drive power
West Gate Tunnel: 8,400 kW
- Higher torque
Santa Lucia: 101,296 kNm
Accessible cutting wheel
- Larger tunnel diameters require deeper alignments
- Deeper alignments often entail higher ground and water pressure
- The accessible cutting wheel developed by Herrenknecht enables safe replacement of excavation tools from the rear under atmospheric pressure
- To date, Herrenknecht has delivered 44 Mixshields with accessible cutterheads
High-capacity muck logistics
- For example, with diameter increases from 15 to 18 m, 44 % more spoil per meter of advance has to be handled
- Mixshields: the capacity of the slurry pumps and lines has to be increased
- EPB Shields: the capacity of the screw conveyor or muck belt must be increased
Extreme mixed-face conditions
- Supersize tunnel projects often run through complex und heterogeneous geology
- Herrenknecht Mixshields and Variable Density TBMs efficiently and safely master the most challenging ground conditions
Heavy load on excavation tools
- Increased rotation speed for outer disc cutters
- Higher excavation volume
- Herrenknecht systems for cutter monitoring help to reduce possible damage, to better plan replacement intervals and optimize the return on investment
- Large-diameter Variable Density TBM with accessible cutterhead for drives with extreme pressure to avoid high-exposure stone crusher maintenance
- XXL TBMs for smaller horizontal curve radii of 200 meters
- Innovate accessible cutterhead solutions for EPB Shields
- Efficient assistance system to drive the machine close to the optimum operating point
Legacy of record-breaking
A look at Herrenknecht’s portfolio reveals a globally unique project density of tunnels with increasingly extreme diameters. Explore the projects.
HAMBURG ELBE TUNNEL 4th TUBE
First use of the newly developed cutting wheel accessible under atmospheric conditions for safe and more efficient tool changes.
M-30 BYPASS SUR MADRID CALLE 30 TÚNEL NORT
Two concentrically arranged cutting wheels that can rotate independently of each other so the high torque can be applied to the ground gradually during start-up.
Shanghai Changjiang Under River
2 x Mixshield
Tunnelling: 2006 – 2008
The two Mixshield giants reached breakthrough after 7.47 km of tunnelling 10 and 12 months earlier than planned.
The entire machine is designed to be explosion-proof, including a double-walled enclosed belt conveyor pressurized with compressed air and a powerful ventilation system.
GALLERIA SANTA LUCIA
Barberino di Mugello, Italy
Long-distance drive over 7.55 km with a total of 1.5 million m³ of muck.
HONG KONG TUEN MUN–CHEK LAP KOK LINK
Hong Kong, China
Currently the world´s largest tunnel boring machine.
St. Petersburg, Russia
Completed design study for a double-deck road tunnel under the river Neva.
1997 – Hamburg
2006 – Madrid
2006 – Shanghai
2010 – Spravo
2016 – Santa Lucia
2015 – Hong Kong
XXL tunnelling stronghold
26 gigantic road tunnels
for the yangtze river delta
The Yangtze River Delta is one of the most vibrant regions in China. The fast-growing area on the east coast represents more than a tenth of China’s population and contributes about a quarter of China’s economic output. The national strategy of regional integration and high-quality growth is adding further momentum to the region with 27 urban cities.
Planning a multipurpose tunnel?
Ready to help!