The breakthrough of an 8m (26.2ft) diameter Robbins Main Beam TBM at China’s Yin Han Ji Wei project is both a cause for celebration and also a triumph of technology and perseverance. The machine overcame 17.5km (10.9 miles) of tunnel in some of the most difficult geology ever encountered, breaking through in the first quarter of 2022.
A Robbins TBM and experienced crew were able to overcome difficult conditions including severe water inflows, abrasive rock, and high energy rock bursts on a Chinese tunnelling job
The Yin Han Ji Wei project is a water diversion tunnel that traverses the Qinling Mountains of Shaanxi Province, with up to 2,000m (1.2 miles) of cover. "Every day was full of challenges. We are most...
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