The Eastern Alberta Transmission Line Project is a massive utility project spanning 488km from Gibson, Alberta, to Brooks Alberta. The construction involves the installation of Concrete Pile foundations, Driven Steel Foundations and Augered grillages as well as the installation and stringing of some 1490 steel lattice transmission towers.
For this project, Valard Foundations provided drilling and installation services for Drilled pier construction, as well as machinery, engineering and manpower support for the augered grillages.
Valard Foundations designed and developed an efficient method of suspending a grillage into an open shaft and then back-filling with 20% concrete fill. This would then cure, and could be back-filled with insitu fill, allowing for enough weight to prevent structure uplift, while also providing a concrete base for the tower foundation.
For drilled pier construction, Valard Foundations deployed six drilling rigs ranging in size from a Watson 2100 to a Soilmec SR90 as well as multiple cranes, loaders, bobcats and multiple heavy trucks to move equipment around. The monumental task of shuffling rigs and cranes from one side of the project to the other was tackled by a team of dedicated heavy truck haulers that could be deployed across the project within 2-3 hours from central locations.
The project also had to tackle difficult environmental conditions such as high winds (exceeding 100km/hr) as well as temperatures in excess of -40°C and +34°C. In total, close to 1000 caissons and 1280 augered grillages were installed on the EATL project totaling close to 40,000m3 of concrete. All of this was completed in just 14 months.