When it comes to the electrical and mechanical services, Arup associate director Paul Wellman has no doubt where the biggest challenge lies. fiAlthough relatively straightforward in terms of the design and installation, fl he explains, fiour main concern has always been the Tube Ticket hall, which has to remain operational throughout. fl The two new ticket halls are as near as the project gets to a greenfield site, but the construction process for the Tube Ticket hall involves 10 interim stages, each of which has different services requirements, such as lighting and CCTV - some part of the permanent work and some temporary. Every system or piece of equipment has to go through an approval process before London Underground will allow it to be brought into use.
Construction of the new ticket hall will take three years, and the phases have been designed as much with the services in mind as the demolition and construction sequences. The ultimate aim is to do as much of the permanent work as possible in each phase. fiWe're trying to rationalise the work so that if we do something in stage two we don't have to do it again in stage three, fl explains Wellman.
At the heart of the ticket hall will be a completely new Station Operations Room housing all the key controls for the whole of King's Cross St Pancras station, including safety, fire and life critical systems, building services and communications such as radio, CCTV, help points and telephones. It will replace the existing control room, which is being demolished to create extra space.