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Epping to Chatswood Tunnel
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.
The tunnel was constructed in three stages and three separate sections, the base, the walls and the roof. The client choose PERI to supply the roof form only for the first section as they had a special steel form for the walls and base. The roof was sloping and at the edges was over 2.0m deep, providing some interesting challenges on how to form up the soffit. Another problem was that the floor at the edges was sloping and we were unable to shore off it. Thus PERI supplied special sheer brackets to support the edges, a combination of Multiprops, ST100, compression braces and multiflex for the roof.
After the first section the client had fallen behind and asked PERI for a solution for the walls as well. They were able to do more with TRIO and the Multiprop shoring then they could with the steel form.
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| PERI Systems In Use |
MULTIPROP System
ST 100 Stacking Tower
MULTIFLEX Girder Slab Formwork
TRIO
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| Contractor: |
Thiess Hochtief Joint Venture |
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Field Service:
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PERI Australia Pty. Ltd., Australia
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