The Hilton Haulage project involved the development of two large (~5,000 m2) warehouses and associated infrastructure. Davis Oiglvie have provided a range of services for this project including geotechnical and civil design, surveying, planning services and environmental management.
The large and complex site is bordered by a state highway and arterial roads which are subject to frequent heavy vehicle movements. To minimise the health & safety risks associated with on-the-ground surveying, a drone was used to perform a photogrammetry survey of a site. The drone required large white crosses to be painted onto the ground as survey control for the photos. These were installed in safe areas throughout the site and coordinated with GPS. The drone captured 664 photos of the site during 2 flights. Using this data we were able to extract a digital terrain model of the site with a contourable surface for designing. Unlike a regular photo an orthomosaic has the same lack of distortion as a map and can be used to measure distances accurately.
Davis Ogilvie designed and completed shallow and deep geotechnical investigation, assessment and geotechnical reporting, as well as environmental investigations. The geotechnical investigation tailored for the site revealed a subsurface of complex geology and variable groundwater conditions. The geotechnical data was carefully analysed and considered against the foundation demands of the building under both static and future seismic conditions. Working closely with the project structural engineers, a foundation system was strategically designed. Careful consideration was given to the topography, earthworks procedure and contaminated nature of the soil, as well as the areas of uncontrolled fill, soft soils and groundwater levels across the site. The Davis Ogilvie geotechnical and environmental teams worked in close collaboration with the Client and the Earthworks Contractor to construct 1.5 m thick, (total 16,000m3) geogrid reinforced gravel rafts in 25 stages over the 2017 and 2019 winter periods. Drone technologies as well as portable (tablet) AutoCAD programs were employed to accurately position, track and record information throughout the earthworks phases.
As part of the consenting process for expansion, a new entranceway from the adjacent State Highway 74 was designed by our civil engineers. A full design was completed for the new intersection that required careful consideration of the state highway as well as the numerous existing and proposed services. Our civil team completed detailed modelling of heavy vehicle movements in and out of the site and prepared plans for the required extensions to the existing pavements as well as the full road marking and signage for the new intersection. We also provided pipe layout, earthworks design and site liaison for the development, including detailed engineering plans for construction, earthworks, sewer, water supply connections and Erosion and Sediment Control Plans.