Brisbane Airport Link Project – Toombul Jacked Box
Location: Brisbane, Australia
A massive $4.8 billion infrastructure investment linking Brisbane CBD to the airports East West Arterial connection road
Length of the Airport link: 6.7 km long
Australia's longest road tunnel
Architect: Thiess John Holland
Assurung the large volume to be supplied with in the tight time frame
Requiring efficient solution versus the traditional methods of tunnelling which requires up to 30 weekend track closures, affecting freight, the city network and AirTrain customers
Thiess John Holland joint venture
Successful box jacking operation without any disruption to the 380 trains which travelled over the railway embankment daily during the 36 day box jacking operation
Winner of the annual Fleming Award by The British Geotechnical Association (BGA)
The 2012 award recognises excellence in geotechnical design, construction, innovation and teamwork
Suppling in excess of 2500 m² of TRIO formwork along with specially designed 10m high sloping stop-end forms utilising RCS and HD200 to support the jacked boxes cutting toe.
Two massive concrete boxes, 65 metre long, 12.5 metres high with a combined span of 38 metres, were pushed 55 metres into position beneath the railway embankment under Queensland's busiest railway line.
The two huge concrete boxes were then constructed adjacent to the railway line, before hydraulic jacks and steel strands were used to push and pull the boxes through the rail embankment.