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Eclipse Clock, St. Pancras Rail station, London

The new clock, over 5m diameter, is suspended in front of the existing clock. Passengers from trains entering the station will see initially see both clocks then as the train moves forward the new clock will eclipse the existing clock.

Our team were commissioned to carry out a finite element analysis of the clock face and the supporting structure to ensure that neither would suffer any detrimental structural effects during the erection and subsequent suspension of the assembled time piece.

To ensure public safety the erection was originally scheduled to take place over two night shifts in the absence of the general public. After the initial shift the part assembled clock would be elevated to allow for the undisrupted flow of the general public.

To enable the lifting from the horizontal to the vertical position a Genie hoist was proposed to support the trailing edge whist the suspension cables would support and lift the clock to the desired level. 

To overcome possible damage to the artwork during the erection sequence, we designed a novel method of an erection mechanism to ensure that the stresses and consequential deformation would be kept to an absolute minimum. This method reduced the erection period significantly and consequently the fully assembled erection was completed in a single shift with no adverse effects.