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Cape Lambert Port in Australia to receive upgrade

The scope of works is the construction of a 256m extension of the existing Cape Lambert wharf.With wharf construction the precise positioning of the pile clusters is critical to the speed and success of construction since preformed sections are then placed on top of them. If the piles are not in the designed 3D positions then the preformed sections will not fit. While positioning of vertical marine piles is difficult it’s the marine raked piles that have been a greater challenge to position for contractors as the direction, inclination and height as well as horizontal position all have to be monitored. The Trimble piling solution was developed 12 years ago for this specific task. Trimble’s HYDROpro Construction software with precise position and heading input from the GPS allows the operator to take control of the rig and the pile positioning tasks without the need for surveyors. In this case a jack up rig is ideal for accurate positioning as the platform is stable and not affected by tidal variations. The Trimble Marine construction positioning system was used for positioning the jack up rig to within a metre of position and orientation. Then one GPS antenna is transferred to the piling template that is attached on hydraulic skids to the side of the jack up rig for the final centimeter accurate movement to the 3D design position and heading. The Trimble SPS851 GPS+GLONASS receiver was onboard connected to the secondary SPS551H heading receiver. These two receivers provide centimetre position as well as heading to a precision of 0.05°. A Trimble SPS851 base station was onshore sending corrections to the jack-up to ensure the centimeter accuracy was achieved. The GPS data was fed to the Trimble HYDROpro Construction PC software and the software presented the guidance information in an easier to understand graphical and textural display which allowed for immediate guidance of the rig and then the piles. This solution solved a complex problem and presented the information in a way that the operators could increase productivity of this piling task. It is possible to get a full ‘as-built’ report from the software once the rig is in its final position prior to spudding the pile. These systems that have been installed on many piling projects around the world speed up the positioning process, operate 24/7 and since no line of sight is needed they operate in all weather conditions. The other benefit is that you do not have to place surveyors with optical equipment in unsafe locations

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