Kwinana Outfall Temporary Jetty

The Kwinana Power Station project required a temporary marine access structure to support installation of a cooling water outfall pipeline for the 320MW gas-fired power station in Western Australia. The works needed to provide safe access for heavy plant, pipeline installation and cofferdam operations in water depths of up to 10m.

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Key Project Elements

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Temporary Jetty

• 324m long temporary jetty
• Designed to support a 180-tonne crawler crane
• 27 spans, each 12m long
• Modular segments for efficient transport, assembly and removal
• Construction methodology allowing one jetty span to be built per day

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Pipeline Installation

• Installation of 1,800 ID concrete pipeline
• Direct access for excavation equipment
• Spoil removal from the pipeline trench
• Pipe placement and trench backfilling

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Cofferdam Works

• 20m long x 4.5m wide cofferdam driven beside the jetty
• Sheet pile driving and removal supported from the jetty
• Cofferdam removed and repositioned as pipeline works progressed

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The temporary jetty gave the project team a practical construction platform in a marine environment. Its modular design supported efficient installation, relocation and removal while providing the strength needed for heavy crane operations.