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  Delivering a Safe Integrated SCL Design: The Challenges and Successes of Crossrail Contract C300/C410

  The SCL primary lining was designed to withstand the various temporary conditions and also formed part of the composite permanent works design. Retaining design responsibility for the composite SCL primary and secondary lining design with one party (Mott MacDonald (MM)), whilst ensuring that the Contractor retained responsibility for excavation and temporary support presented both benefits and challenges. These are discussed within the contractual framework between the Employer’s SCL designer (MM), the Contractor (BAM Ferrovial Kier (BFK) Joint Venture) and the Contractor’s SCL designer (Donaldson Associates). The paper investigates how an integrated and collaborative approach drove efficiencies in the design through all stages of design development. As the project has evolved, the team has provided innovative solutions to meet the changing construction programme and interface constraints.

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