MJ Civil undertook a substantial design check and verification role on behalf of the main contractor with respect to the subcontracted design and construct aspect of the the formwork and falsework support associated with the Port Botany grade separation works.
In order to improve traffic conditions and do away with a rail level crossing, an elevated roundabout with three access ramps, known as the grade separation works, was constructed in Penrhyn Road. Four precast concrete bridges link the ramps to the elevated roundabout, thus allowing unobstructed road traffic over the rail corridors below.
The construction of the large roundabout of varying height and slopes required complex formwork and shoring. Additionally, it was required to be cast in one continuous pour – the largest single elevated pour in NSW history – requiring over 2500 cubic metres of concrete.
Due to the irregular sloping shape of the roundabout, particular attention was placed on ensuring adequate continuity of the deck formwork and bracing of the shoring in order to securely contain the substantial mass of wet concrete during placement.