DECOMMISSIONING Ӏ CASE STUDIES
Schares. “The compactness and ease of set-up, together with accurate synchronised lifting, made the Enerpac JS-250 a perfect fit for this project.”
GANTRY CRANE REMOVAL Sarens was asked last year to remove two redundant overhead gantry cranes from within a warehouse in Teesport, UK. The challenge was to remove
the gantries without modifying the warehouse structure while allowing site operations to continue at the opposite end of the warehouse. The overhead gantry cranes had to be lifted from elevated rails 15m above ground level and placed on the ground to allow the demolition. The two cranes weighed 122 tonnes each and measured 30.7x12x7.8 metres. Sarens crew decided to use
four Sarlift Gantry Towers, with a
20 SPMT axles supported the decommissioning of a gantry by Sarens
capacity of 250 tonnes per tower, along with a ten-metre-long lifting beam, to raise the gantries. 20 K24 SPMT axles with two PPUs then moved them once on the ground; and three mobile cranes, of 400t, 500t and 100t capacity, were used to assist. Bracing steelwork, a spreader beam and tackle and a telehandler were also utilised. Sarens engineers worked out a customised solution for the client. The trolley and cab were positioned on the overhead gantry crane as per Sarens’ specifications and parked in their pick-up position.
The 100t mobile crane assembled the SPMTs and Sarlift gantry within the warehouse adjacent to the gantry crane which was then driven into position. It was lifted 800mm using the Sarlift Gantry until the underside of the
girders were above the rails. The SPMTs were then used in carousel mode to rotate the overhead gentry so that it could pass between the rails and lowered. Once lowered the crane was tandem lifted to the ground using the 400 tonne and 500 tonne mobile cranes. The customised solution by
Sarens provided considerable cost savings. This was because there was no requirement to remove roof sections from warehouse; no strengthening work was required, as supports were provided to the overhead gantry crane; and there was minimal disruption to port operations. There were safety benefits as well, from avoidance of working at a height, a reduction in project man hours, and work being undertaken within the warehouse so reducing exposure to the elements.
42 CRANES TODAY
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