Driven Precast Concrete Piles In lieu of Steel Piles at BlueScope Steel's Port Kembla Facility-Paper

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BlueScope Steel selected driven, segmental precast concrete piles for its No. 6 Blast Furnace Reline project at Port Kembla, replacing the facility’s traditional driven steel piles. The alternative was developed by Wagstaff Piling in collaboration with BlueScope and the project’s structural and geotechnical consultants.<br /><br />The site’s variable fill, estuarine and alluvial soils, and residual soils over strong bedrock required piles approximately 17–22 metres long. Cemented slag fill made installation difficult, so pile locations were pre-drilled or pre-dug to reduce pile stress and vibration. Piles were designed for structural and geotechnical demands, with lateral behaviour analysed using L-Pile or PIGLET. Their concrete mix and reinforcement were specified to meet durability requirements.<br /><br />A key construction advantage was the piles’ mechanical joints: segments could be connected in minutes without the welding, extra personnel, cranes, cooling delays and inspections required for steel-pile splices. This was especially beneficial in low-headroom areas, where short pile sections were needed. Where services prevented access by a conventional piling rig, a crane-supported “hanging hammer” enabled installation without relocating services or substantially redesigning structures. Designs were also adjusted to avoid clashes between raked piles, existing structures and services.<br /><br />Dynamic pile load testing using a Pile Driving Analyzer, followed by CAPWAP analysis, confirmed pile capacity and integrity. Restrike tests showed a 10–15% increase in shaft capacity, while the piles reached refusal on rock and achieved required design capacities.<br /><br />The project demonstrated that driven precast concrete piles could provide design parity while improving construction efficiency, safety, cost and schedule. The approach proved a robust foundation solution for work within an operating steel manufacturing facility.

Keywords

precast concrete piles

BlueScope Steel

blast furnace reline

Port Kembla

driven piles

pile driving analyzer

CAPWAP analysis

mechanical joints

geotechnical engineering

foundation construction