Annacis Island wastewater treatment plant, Canada

1.5 MILLION CU. METRES

In June 2016, following 21 months of work, Menard, working in a joint venture with JJM Construction, completed the reinforcement of about 1.5 million cu. metres of soil as part of the extension of a wastewater treatment plant.

In a demonstration of its agility, Menard's Canadian subsidiary proposed reliable alternative solutions for excavating 180,000 cu. metres of materials, relocating existing utility lines and carrying out ground improvement.

After painstakingly implementing nine test phases, the team settled on a construction method, rigorous planning and a technical solution geared to the constraints of the site.

Anti-liquefaction treatment was applied via vibrocompaction and installation of stone columns, while adjacent structures were protected with a 30-metre-deep Cutter Soil Mixing (CSM) wall over a length of 480 metres as an alternative to the jet grouting solution initially planned by the engineers.

In another development, Sixense experts continuously monitored settlement during construction to avoid incidents and damage to the existing facilities in the vicinity of the site and to enable the plant's work to continue unabated.