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WORKSHOPS, DEPOTS & LIFTING EQUIPMENT


Crucial roles for overhead cranes on Crossrail


Chris Lindley-Smith from Street Crane Company explains more about its role in the Crossrail project. O


verhead cranes play crucial roles in building and maintaining rolling stock,


but their role in infrastructure development has been relatively limited. The development of Crossrail has changed this and Street Crane Company now has ten cranes installed supporting the project.


Towering above Oxford Street’s bargain hunters, the latest is a 40-tonne double girder freestanding Goliath crane. Located on the site of the Tottenham Court Road Western Ticket Hall, the crane plays a crucial role in


excavating and lining the shaft that will link the deep Crossrail tunnels with the London Underground lines above.


The crane is used for lifting spoil skips and lowering tunnel segments and other pre-cast elements for the tunnels and rail/underground interchange above. Ground beams, 1.5 metres deep, have been cast 31 metres apart on which the rails for the Goliath crane legs run. These beams shield the excavation shaft and also protect the crane from any minor ground movement due to excavation. The crane beam has an unusual 5.1 metre cantilever at one end so that spoil skips can be offloaded to waiting trucks outside the protected area.


A double girder box beam design, the crane has twin


custom-


built 20-tonne hoists. These give maximum flexibility as they can


Next steps at Central Rivers


be used singly or in tandem depending on the weight and geometry of the load to be moved. The crane has a total height of lift of 37 metres to reach the deepest ground works.


Elsewhere on the Crossrail development, six ten-tonne single girder cranes from Street are used in the segment casting shops. In the curing yards three rail running Goliath cranes place and retrieve the tunnel segments after they have reached maximum strength.


Crossrail is a subsidiary of Transport for London, who are joint sponsors with the Department for Transport. BFK, a joint venture between BAM Nuttall, Ferrovial Agroman and Kier Construction, is the main contractor for this western stage of tunnelling work from Royal Oak to Farringdon.


Over 90% of the investment by Crossrail remains within the UK economy.


FOR MORE INFORMATION


T: +44 (0)1298 812456 E: admin@streetcrane.co.uk W: www.streetcrane.co.uk


rail technology magazine Dec/Jan 13 | 61


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