VMT guides microtunnelling in France

VMT’s microtunnelling guidance system assisted in the construction of a sea outfall in Nice, France.

The sea outfall was part of a new sewage tunnel and consisted of a 1,600 mm diameter pipeline installed using microtunnelling for a 482 m section running along a straight route and holing out on the seabed 450 m from the shoreline.

During the installation, the microtunnel boring machine (MTBM) was provided guidance by a VMT SLS-Microtunnelling LT navigation system to keep the bore level and in line.

The new VMT system was introduced after the initial 115 m was navigated by contractor Ludwig Pfeiffer’s pre-owned laser guidance system when it was decided that a more sophisticated system was needed to ensure the successful completion and accuracy for the undersea section.

Ludwig Pfeiffer said that selecting the new navigation system was a simple choice considering the positive results the company had experienced with VMT in previous projects.

To recover the machine, a module was installed to remotely disconnect electrical and data cables and the MTBM was lifted with the support of a dedicated underwater operation team.

The installation was completed in 50 days.

For more information visit the VMT website.

If you have news you would like featured in Trenchless International contact Managing Editor Chloe Jenkins to discuss promotional opportunities at cjenkins@gs-press.com.au

First published 24 September 2019.

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