| The Northern
Busway project is an extension to the existing express bus route
within Brisbane. RMD designed and supplied both formwork and
shoring solutions for various piers, headstocks and the main
voided slab. The project commenced in June 2008 and is expected
to be completed in June 2009.
Span 6 – Voided Slab
The key area of work consisted of design and supply of the shoring
to the soffit of a voided slab which was 1800mm deep. The area
of the slab to be poured was 700m² and the propping height
ranged from 6.5m up to 10m. In total we supplied over 5000m³
of Rapidshor which also included the Rapidshor Captive Deck
System, which provided a safe working platform and Super Slim
Soldiers as primary bearers.
One element that we had to overcome was a
45º batter in the ground levels, which increased the propping
height by 3.6m, whilst maintaining the 74kN leg load capacity
of the Rapidshor. The solution was to initially lay Super Slim
Soldiers on the batter, fabricate special shear brackets which
fitted into the Super Slims and then build the Rapidshor legs
off these shear brackets. A large concrete block was used at
the base of the Super Slims to prevent the entire falsework
sliding down the slope.
2Pier 46
RMD Australia also supplied formwork to the blade wall of pier
46, approximately 11.5m high, which was poured in one hit using
Super Slim Soldiers and 150x77mm wales in conjunction with 20mm
Rapid Bar Tie and High Load Waler Plates ensuring the minimum
number of ties were used through the blade pier.
Rapidshor shoring and Super Slim primary bearers
were also supplied to support the headstock soffit on pier 46.
However, working room around the base of the pier was very limited
and on one side the extremely busy Inner City Bypass was only
2.5 metres away. In order to provide an adequate working platform
at headstock level the Rapidshor was used partly in cantilever
with additional plan bracing.
Other recent projects that RMD Australia
has worked with Abigroup on are the Tugun Bypass and the Gateway
Bridge Duplication project (Abigroup Contractors Leighton Contractors
joint venture)
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