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Microtunnelling success for French water network

Contractors Valetin and SMCE Réha have completed work to upgrade the drinking water network in the French town of Plobheim using pipe jacking drives to minimize the impact of the work.

Four drives were completed on the scheme using a refurbished Herrenknecht AVN1200 microtunnelling machine with the longest 215m drive taking the tunnel through non-cohesive ground with high groundwater and under a busy road.

Valetin and SMCE opted to use the slurry-supported 1,740mm diameter Herrenknecht machine to cope with the ground condition and minimize the risk of ground movement.

In total, the contractors have driven 470m of tunnels on the scheme.


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