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Evergreen Rapid Transit - Tunnel Invert Infill

Contract Value

$3,234,000

Location

Burnaby, BC

Completion Date

January 22, 2016

Description

Scope of the project was to place two individual classes of aggregate to a total depth of 2.17 meters for the total length of the 2000 lm of bored tunnel.

Challenges:

  • To meet the schedule crews had to work 22 hours per day
  • 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 surface.
  • 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 not sufficient for conventional trucks to dump. To facilitate moving the aggregate Cat 730 articulate trucks with ejector boxes were used.
  • Because there insufficient room to turn, the four 730 Cat trucks to turn they had to back into the tunnel after they were loaded and drive out.
  • A small dozer and compactor were used in the tunnel to place and compact the aggregate in the tunnel.
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More to come. Please check back again later. Thank you!

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