Waterway Constructions Pty Ltd has recently taken delivery of their piling crane barge named "KOCHI". The crane and leader was built by SKK in Japan and the barge is 45m x 18m. The rig can be used to install piles using hammers, vibrators or drills. In crane mode it can lift 210 tonnes at 9m radius.
With all piling rigs it's a challenging task to position the barge and lay anchors, then carry out the final manoveures to get into its precise position required for modern piling projects. The Kochi's rotating pile leader and a Trimble GPS based Pile Navigation system speeds this process up and can quickly adapt to handle rake angles for inclined piles. It's also able to change from the various modes of anchoring, to sheets piling and to conventional piling.
In has been well utilized since arriving in Australia on some urgent port infrastructure projects. The first project was wharf extension at Port of Newcastle where sheet piling and piling were required so the coal exporting capacity at this port could be increased.
Its next job was the new Iron Cove bridge in Sydney. A new new bridge parallel to the existing one is being built. In April 2009, the NSW Government approved plans to construct a second bridge over Iron Cove as part of the Inner West Busway along Victoria Road. The new bridge is being constructed on the western side of the existing bridge and will hold three westbound traffic lanes with one lane designated as an AM bus lane. The existing bridge will carry three city bound traffic lanes and a 24 hour bus lane. There will also be a 4.3 metre wide pedestrian and cycle path on the western side of the new bridge which will connect to both the The Bay Run and Victoria Road. Work on the duplicate bridge commenced in July 2009 and are expected to be completed by April 2011.This roading infrastructure project involved vertical and raked piling.
The Trimble precise GPS Pile Navigation system.
The GPS used on this barge is the dual antenna system that allows for accurate positioning as well as precise direction. This installation uses the Trimble SPS 851and SPS 551H receivers connected to the Zephyr Rugged Antennas. These antennas can handle the shock and vibration that is evident on piling operations. A SPS851 GPS base station tracking GPS and GLONASS satellites is also used.
An accurate dual axis inclinometer, for tracking pile leader inclination, is mounted on the leader and interfaced in HYDROpro™ Construction software in the cabin.
Another unique capability on this installation is the ability to track the progress of the hammering of the pile using a distance meter that is located on the top of the leader and measures down to the top of the hammmer. This is coupled with the GPS so that the effect of changing water level, due to tide, is removed. This integration of sensors to measure the real-time reduced level of the top of the pile saves a surveyor tracking the progress as well as giving the engineer immediate information required to stop piling.
The system can be used for placing anchors in pre allocated positions that are well clear of subsea cables and pipelines.