In Australia, design standards for bulk materials handling machines such as stackers, reclaimers, ship loaders and ship unloaders are published and maintained by Standards Australia. These standards were introduced as a part of the investigations into a number of failures of bulk materials handling machines within Australia.
One of the key parts of these standards is making sure that after assembly and other modifications that machines centre of gravity is still where it is designed to be and that the weight of the machine is still within the design specifications.
The jacking steel work was firstly modeled using Top Down Modeling technique which incorporates the use of CAD files within the model. Extensive site measuring was taken out to ensure that the steel work would fit and it design to incorporate simple and easy fabrication and installation. The designs were then structurally checked and modifications were made if required.
Installation of Long Travel Jacking Steelworks
The on site installation was completed to the drawing without complication. The jacking
operations followed a specified sequence through the machine to allow work areas to be opened up. Firstly the long travel was jacked, then the inner shuttle and the outer shuttle.
The outer shuttle was jacked in two stages. The seaside was jacked to allow removal of the rear bogies then the land-side was jacked to allow removal of the front bogies.
Once the work was completed in position 1 the ship loader was moved into position 2. This is where the front inner and seaward long travel operations were extensively checked before the operation began and all the loads seen during the jacking were below the loads itemised in the specification.