Landivisiau microtunnel

Landivisiau microtunnel

Boring a 530 metre-long, 2.15 metre-wide microtunnel in one of the hardest and most abrasive rocks calls for the highest levels of vigilance. Add to that a 26-metre height difference between the entry and exit points as well as a crossing both a river and the busy...
Black Sea landfall

Black Sea landfall

OPTIMUM continues to expand its international reach with its latest mission in Romania. The 1500m long horizontal curve landfall project, which used an anchored lay barge during pull-back, will connect two natural gas fields 120kms out in the Black Sea to the inland...
From study to completion

From study to completion

• Echirolles : a 65 metre-long urban pipe ramming project under the Grenoble ring road• Brioude : a 140 metre-long HDD crossing to bypass new motorway construction• Albias : 3 parallel 310 metre-long HDD crossings under the rural Aveyron river Three projects, all in...
Réseaux VRD

Réseaux VRD

Understanding the full scope of a trenchless project and propose relevant solutions at every step of the way; the exhaustive article published in the latest edition of Réseaux VRD underlines the intelligence of OPTIMUM’s involvement in the Dordogne river crossing....
250 projects and counting !

250 projects and counting !

In just 30 months, OPTIMUM has conceived over 250 trenchless projects, examining and supervising 51 000 linear metres of crossings as well as 15 km of landfalls. Its growing team of specialist engineers reinforces the pertinence of each assignment by optimising...