North Saskatchewan River Bridge Replacement
Supply and install 2 abutments supported by 24 each HP310 x 110 H-piles with 3 river piers supported by 5 each 1500mm diameter caissons. In addition 2 of the river piers constructed by diked berms were reinforced by sheet pile cofferdams. The work was completed in 2 phases.
Key Project Information
- Project Type:Concrete Rebar Placement and GroutingPile Driving
- Budget:$411K
- Timeline:September 2011 to June 2012
- Client:Flatiron Construction Ltd.
- Location:Drayton Valley, AB
The 1st phase started with the construction of the east river pier and installing 5 each 1500mm diameter concrete caissons 14m deep. They were excavated using a temporary casing installed to pile tip. The very dense clay shale bedrock (N100+) would not seal off and all piles were poured using tremie concrete procedures. The temporary casing was extracted as the concrete was tremied. Caissons were tested for H2S gas during the entire drilling process.
The east abutment was also installed in the 1st stage with -35 degree weather.
During the spring of 2012, the berm installed to support the installation of the girders, flooded due to extremely high water levels. Sheet piles were installed to reinforce the berm cofferdam as extra work.
The second stage work started in September, 2012 with the installation of the west abutment h-piles. Excavation for the 3rd pier was completed after the abutment piles were driven. 5 each 1500 mm diameter shafts were completed at the third pier. The drill rig and crew moved from the 3rd pier to the 2nd pier and the shafts were installed. All shafts were wet and tremie concrete procedures were used to complete the shafts.