Pont de la Motte
France, Tours

In Tours, in northwest France, a Herrenknecht utility tunnelling machine completed the crossing of the River Loire with flying colors. In order to reliably connect the districts and suburbs of the capital of the Indre-et-Loire region north of the river to the Grange David treatment plant on the southern bank, a new sewage pipeline (outer diameter 2,640 mm) had to be built. With a reinforced Herrenknecht AVND2000AB, the French tunnelling specialists bored a 620 meter long section of this line. At a depth of up to 4 meters, it dug its way under the river bed. Between January 2017 and the successful breakthrough in the target shaft in April 2017, team and machine mastered precise curve drives with a radius of up to 314 meters and complex geology with tuff and alluvium.

Data Sheet

Country, Location

France, Tours






Alluvium, tuff

Tunnelling length

620 m

Machine Data

1x AVN Machine:
Diameter: 2,675 mm
Lining method: Pipe jacking
Cutterhead power: 315 kW

Your contact person Contact us

Steffen Dubé President and General Manager Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser Commercial Manager Herrenknecht Tunnelling Systems USA, Inc.