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Epping to Chatswood Tunnel

Project data

Location: Sydney, Australia

This section of the rail tunnel passed through a national park and was originally proposed as a bridge. Due to community concerns they decided to tunnel below the national park. Cut and cover was the proposed method as the tunnel roof was just below the river bed.

  • Constructed in three stages and three separate sections, the base, the walls and the roof.


  • Supply the roof form and walls
  • Forming up the soffit completely in spite of sloping roof and over 2.0m deep edge
  • Sloping floor at the edges 


Thiess Hochtief Joint Venture

Benefit to customer

  • More benefits in compared to the steel form

PERI solution

  • Special sheer brackets to support the edges, a combination of Multiprops, ST100, compression braces and multiflex for the roof 
  • TRIO and the Multiprop shoring for the walls