Service Riser Installation, Nokia UKProject: Design of External Service Riser Contractor: Metalwork Services Ltd. Project Outline: Our involvement in this project was as part of the design and build team developing a solution to construct an external service riser for an existing building in Cambridge. The existing building was a modern steel framed structure with thin composite concrete floors and a colded rolled steel cladding system, meaning It was not possible to directly fix the riser to the building elevation.The building was also fully occupied. Our solution was to suspend the service riser frame from cantilevering steels at roof level, with horizontal restriant provided at each floor level.
The riser was prefabricated in 3 sections which were bolted together on site at ground level with all the ducting and cladding being fixed prior to lifting. The complete riser was lifted in a single operation using two cranes. Superstructures undertook complex design and analysis of the riser frame through all stages of the crane lift to ensure deflection limits were not exceeded - maintaining the integrity of the cladding and ducting on the frame. The riser was succesfully lifted and installed with minimal disturbance to the building fabric or its current occupiers.
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