As a key piece of infrastructure linking Brisbane’s north and south, the Story Bridge has defined the River City’s skyline since it was officially opened by then-Governor Sir Leslie Wilson in 1940.
Applying state-of-the-art laser scanning technologies to measure and record this heritage structure, RPS has created a spatially accurate 3D model of the bridge and its surrounds to assist Brisbane City Council (BCC) with maintenance and future planning for this much-loved Brisbane icon.
Bridge maintenance in the clouds
BCC undertakes a continual program of maintenance works for the Story Bridge, however with Fortitude Valley and Kangaroo Point both hot spots for residential development, Council requires increasingly detailed information about clearances and access for equipment, materials and workers when planning maintenance works along the 777 metre cantilevered span.
RPS Surveying experts used a combination of methods including laser scanning and point cloud survey, virtual reference stations (VRS) and Global Navigation Satellite System (GNSS) referencing to develop a multi-faceted package of spatial data about the Bridge, which was then used to develop a three-dimensional AutoCAD model.
BIM power for BCC
The model developed by RPS and the raw data used to produce it represent a comprehensive digital inventory of bridge components and structural elements that BCC uses to schedule maintenance and calculate the quantities of materials required for works packages.
The spatial information collected by RPS has been coordinated to BCC’s own spatial coordinate system – the Brisbane City Survey Grid (BCSG02) – providing a valuable cadastral reference to inform city planning efforts.
Council Planners can easily draw on this data when considering improvements to adjacent infrastructure like bike lanes or footpaths, or assessing development proposals in nearby Kangaroo Point and Fortitude Valley.
A creative yet cost-effective approach to capture
One of the biggest challenges for the RPS team was developing a survey method that would allow us to capture accurate, comprehensive data while minimising impacts to Story Bridge users.
With around 97,000 vehicles using the bridge each day and a constant flow of pedestrians and cyclists, it was important that data capture could be undertaken swiftly and without the need for complex traffic diversions.
An innovative survey methodology was devised using a combination of GNSS, and long and short range laser scanning which allowed all survey information capture to be completed in one week.
The combination of long and short range scanning techniques allowed for both high volume and fine detail information to be recorded, and a team approach to data processing and modelling allowed our team to deliver the final AutoCAD model faster, generating cost-efficiencies for Brisbane City Council as the end-user.
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