Port Terminal - Machine and Rail Subsidence Analysis
With the continuous motion of heavy stacker-reclaimers backwards and forwards over various sections of stockpile rail networks, deflections and track slumping typically results from heavy rainfall and saturated soil. Accumulating over time, the rails can deviate considerably from what was originally installed/surveyed, and subsequently, may exceed original machine design tolerances for deflection under operational load conditions. The subsequent bearing capacity and movement associated with the rail’s foundations introduces distortions to machine sensed positions and orientations, (as shown in diagram below), making some ore stockpiles areas either inaccessible and/or dangerous.
Earlier this year, the company delivered it's first Machine & Rail Subsidence Analysis report to PWCS for their four Kooragang Island Reclaimers.
By utilising their existing machine based 3D-SAM navigation system, in conjunction with sophisticated long term filtering analysis tools referenced to the machine’s centroid, (displayed above, vertical axis in millimetres), measurable rail subsidence was determined. This determined information provides longer term rail subsidence insight and/or associated machine leaning while operating along its rail network.
The accuracy surpasses what can be achieved by traditional surveying techniques thereby providing the best "early warning system" available. We continue to work with a number of our customers building detail databases of specific rail subsidence performance where it is a substantial ongoing operational issue.