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Tunnel machine manufacturer Robbins has launched the first of its new Crossover TBM series machines on a project in Mexico City.
The 28.5-foot XRE TBM was assembled onsite, beginning the project on the Túnel Emisor Poniente II (TEP II) project in August. The TEP II is a major wastewater project by joint venture contractor ALDESA/ PROACON/RECSA. The 3.7-mile tunnel will wind through variable conditions, including competent and weathered volcanic rock, soft sand and clay. The "crossover"...