Single Shield Launched on Laotian Hydro Scheme

Vortext Englisch

In February 2010, contractor CMC di Ravenna oversaw the launch of the first tunnel boring machine ever to excavate in Laos. The 7.6 m (25.1 ft) diameter Robbins Single Shield TBM is digging a new hydroelectric tunnel for the Theun Hinboun Expansion Project, which will provide power to neighboring Thailand.

“We chose the Single Shield TBM based on ground conditions and the type of tunnel lining needed,” said Luca Barbàra, Far East Manager for CMC di Ravenna. The TBM has been designed to accommodate moderate squeezing ground conditions - an articulating cutterhead with overcutters makes the...

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