Jun 11, 2018
In the little French town of Plobsheim near Strasbourg, a joint venture consisting of the contractors Valentin and SMCE Réha has modernized the municipal drinking water system. Several pipe jacking drives were carried out using an AVN1200 microtunnelling machine. The longest section runs through groundwater in a noncohesive geology and crosses under a busy highway. Since the beginning of 2018 the Plobsheim well has been connected to the urban grid.
The construction project "Champ captant d'alimentation en eau potable au sud de l'aglomération Strasbourgeoise" ("Drinking water production in the south of the metropolitan area of Strasbourg") included four underground pipe jacking drives.
In Plobsheim these sections were between 50 and 215 meters long and ran under the groundwater level. The French contractors Valentin and SMCE Réha opted for a slurry-supported AVN machine from Herrenknecht due to the water-bearing ground conditions in coarse gravel and sand, typical of the plains in the upper Rhine valley.
The diameter of the AVN1200 was expanded from 1,505 mm to 1,740 mm and it was equipped with a new mixed-soil cutterhead. "For challenging projects we rely on high quality machine technology from Herrenknecht, which has proven itself again and again over many years.
And for special requirements we often find solutions together," say José Pereira, longtime site manager at Valentin and Guillaume Huntziger, site manager for SMCE Réha.
Otherwise, if the TBM stands still for longer periods, minor heave or settlement can occur on the surface. In 2-shift operation, the drive under the highway was carried out without interruptions. After less than a month, the machine finally reached the target shaft.
The experienced tunnelling crew also mastered the three other drives with flying colors. By the end of October 2017, all 470 meters of tunnel had been completed to the satisfaction of the client – the city of Strasbourg. Since the beginning of 2018, the new well has been connected to the pipeline network and supplies the inhabitants with drinking water.
Machine type: AVN1200
Jun 22, 2018
By: Tom Iseley & Saleh Behbahani
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