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Keephills KH 3 Expansion

Keephills KH 3 Expansion
Date: 2007

The Keephills 3 Expansion, a $ 1.9-billion project, extended and upgraded the existing Keephills site to create one of Canada’s cleanest, coal-fired facilities. As such, Keephills 3 is equipped with an advanced air quality control system, which achieves superior environmental performance. A supercritical boiler technology features higher boiler temperatures and pressures as well as a high-efficiency steam turbine. Installing the extreme size of equipment on soft ground required piles to extend into very large depths in some areas.

Solution:

AGRA Foundations Limited installed 3500 driven steel piles, both H-beam and pipe piles, using up to four cranes and diesel hammers simultaneously. The extremely weak, weathered sandstone bedrock starting at 8.5 m depths required piles of up to 43 m length to create the necessary support for the structure. Piles were installed to about 20 m depths, then extended with welded splices to an average of 29 m to allow for adequate support of the heavy loads.