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CITY RAIL LINK - C6

Surveygroup controlled and monitored a TBM for a 2m diameter bore shaft from Water Street to Nikau Street in Mt Eden as part of the C6 CRL section, diverting a major existing storm water line from the 2 new CRL tunnels.

The complexity of the work required surveying down a 15m deep x 8m wide shaft with the tunnel alignment geometry  a very small radii for tunnel boring.

“TBM’s do not turn easily and with the target 500m long and 20m deep following an S bend to hit a bullseye within 30mm accuracy was a great achievement and much appreciated by the client.”

OUR ROLE:

  • TBM Survey and Control

  • As Built Tunnel Surveys

  • Construction Monitoring

  • Digital Engineering