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Two-component  backfill  grout  system  in  double  shield  hard  rock TBM. The “Legacy Way” tunnel in Brisbane, Australia

Two-component backfill grout system in double shield hard rock TBM. The “Legacy Way” tunnel in Brisbane, Australia

pap237

E. Dal Negro / R. Schulkins / A. Boscaro

The main purpose of the twin tunnels of the Legacy Way project is to connect the western freeway at Twoowong with the inner City Bypass (ICB) at Kelvin Grove, providing an alternative route to local roads for traffic. The project was awarded to the Consortium Transcity, including the companies Acciona, BMD Constructions and Ghella, which used a hard rock double shield TBM to excavate the 4.6 km twin tunnels. One of the main characteristics of the TBM was the use of the two-component grout to inject the annular void behind the tunnel lining, although rock TBMs generally use other systems of backfill grouting. The implementation of the two-component system made up of a cement grout (component A) and an accelerator (component B) mixed at the injection point will be described in detail in the paper.

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Year 2014
City Foz do Iguaçu
Country Brazil