Posted by: admin November 11, 2015


Abergeldie were engaged to undertake works to restore the immediate area around the Tunnel 2 outlet portal for Essential Energy’s Nymboida Power Station. Works included the demolition of existing remains of the damaged outlet, breaking down and removing steel pipe, fittings and trestle bridge, breakdown and removal of thrust blocks and concrete abutments, associated excavation and earthworks and finally to construct a new 1800 steel pipe outlet with a new reinforced concrete thrust block.

Posted by: admin


Stabilisation of an existing, rough-hewn, unlined tunnel to protect an existing water main which passes through it. Scope included removal of loose material from the tunnel surfaces, removal of existing support members, placement of primary shotcrete surfacing to stabilise the tunnel surfaces, placement of reinforcement up-stands and placement of a final, permanent 150mm thick layer of structural shotcrete with weep holes.

Complex Challenges:

To protect workers in the tunnel while it was in an unstable state, a protective steel cage was designed, fabricated and mounted on a movable trolley.