Kangaroo Point Green Bridge

From the outset it was clear that traditional surveying methods would be insufficient. The bridge’s marine construction logistics, modular design and technical tolerances called for a survey approach designed around the construction sequence rather than fitted to it.

High-precision control across the river

We established and maintained a high-precision control network across both sides of the Brisbane River, tied to state datums and re-observed throughout construction. Level closures between benchmarks were held to 3 mm, giving every later measurement a stable reference regardless of which bank, barge or deck segment the crew was working from.

QA of prefabricated components

All prefabricated structural components were surveyed at the Port of Brisbane before transport. Checking geometry in the yard, rather than on the water, meant fit-up issues were resolved before a component was ever lifted.

Real-time verification during installation

As deck segments, the mast and cable stays were installed, we verified position and geometry in real time so the construction team could adjust immediately rather than after the fact. The concrete deck geometry model was revised 33 times through construction to reflect actual conditions, keeping the design intent and the built structure aligned.

A three-year partnership

Three senior surveyors invested more than 8,000 hours over three years. The same people who observed the first control marks were on site for the final as-builts, which is what allowed the team to operate autonomously within the contractor’s program.