BlueFox Engineering

Project Overview

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AltaLink planned the installation of two (2) 230-kV single-cable-per-phase circuits connecting to the Sarcee Substation, located in Southwest Calgary. The proposed alignment required crossing both Sarcee Trail and Glenmore Trail. Due to the depth of installation and to avoid traffic disruption, trenchless crossings were selected. BlueFox Engineering was retained to complete the detailed design for each trenchless crossing location.

Subsurface Investigation

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The subsurface investigations encountered primarily clayey glacial till soils, with cobbles and boulders throughout the stratigraphy. Ultimately, pipe jacking or slurry microtunneling were selected as suitable installation methods.

Installation Method and Conduit Design

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To satisfy the thermal requirements of the conductors, each of the installations would house an HDPE cable duct consisting of twelve (12) conduits, contained within HOBAS pipe. The Sarcee Trail and Glenmore Trail trenchless alignments were designed with lengths of 81.8m and 66.8m, respectively.

Engineering and Design

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BlueFox Engineering completed the trenchless design with plan and profile details for each drive section, and developed performance criteria for tunneling, pipe material, launch/reception shafts, annular grouting, and settlement monitoring.

Completion

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Both installations were successfully completed in the summer of 2017.

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Calgary Ring Road

Project Overview

Subsurface Investigation

Installation Method and Conduit Design

Engineering and Design

Completion

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