Record #00482Technology archive
Herrenknecht's S-880 Qin Liangyu Mixshield was deployed on Hong Kong's Tuen Mun–Chek Lap Kok Link, with a maximum excavation diameter of 17.63 m, documented as the largest operational TBM diameter.
Current Record
17.63m
Current record value
The Mixshield technology was applied to complex seabed geology and high water pressure. A large shield requires substantial torque and face-pressure management.
ASME reports that the machine was about 120 m long and weighed approximately 4,850 tonnes. After its first section in 2015, the shield was reduced to about 14 m for subsequent tunnelling.
The record conclusion has sufficient verification support.
Basis: direct confirmation by an authority
ASME and a 2026 global TBM case study support the record of 17.63 m for an operational shield. The 2015 date marks completed tunnelling work. Hong Kong is linked as the project region without inventing the tunnel-face location.
Current Entry identifies the current entry in this archive; it does not establish that the record is still held today.
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