Evergreen Rapid Transit - Tunnel Invert Infill

The scope of this project was to place two individual classes of aggregate to a total depth of 2.17 meters along the total length of the 2,000 LM of bored tunnel. We met multiple challenges, including:

• 24-hour, non-stop work
• A conveying system and chute had to be installed to transfer aggregates from the stockpiles at ground level to the trucks below
• All equipment had to be lowered into the portal with a 210 tonne crane
• Height of the tunnel was insufficient for conventional trucks to dump so to facilitate moving the aggregate, we used Cat 730 articulate trucks with ejector boxes
• Without room to turn, the 730 Cat trucks reversed into the tunnel with their load
• A small dozer and compactor were used within the tunnel to place and compact the aggregate
• Access was restricted to the north portal on the north end of the tunnel
• The base of the north portal was approximately 7 meters below ground