Chevron Australia’s Gorgon LNG Jetty and Marine Structures Project
Leighton Contractors, in consortium with Saipem, is designing and constructing the LNG Jetty and Marine Structures.
The scope of the contract consists of the design, material supply, fabrication, construction and commissioning of the 2.1km jetty. The works also include supply, fabrication and construction of marine structures including a heavy lift facility, tug pens and navigation aids.
Concrete structures, known as caissons, will be manufactured at the Australian Marine Complex in Henderson, transported to Barrow Island and lowered onto gravel beds placed at intervals on the sea floor to provide a support structure for the jetty.
The jetty will consist of steel trusses 70m in length, supported by 56 caissons leading to the two loading platforms approximately four kilometres from the shore. By using these locally manufactured caissons, the Saipem Leighton Consortium will avoid the traditional piled construction method, which would have required hundreds of steel piles to be driven into the sea bed. This has eliminated the noise and vibration associated with driving piles, reducing the project’s environmental impact.
Barrow Island has been a Class A Nature Reserve since 1910 and is an internationally important conservation estate. Leighton Contractors is complying with measures to protect Barrow Island and its surrounds.
Features at a glance
- 60,000m3 concrete
- 25,000 fabricated steel components
- 56 caissons including berthing and
- mooring dolphins
- more than 100 heavy lifts in total
- 83 marine vessels supporting the project
- 1 no 1,100T crane barge
- 1 accommodation barge