Post tensioning provides the right solution for complex cancer build


We explore how specially-engineered post-tensioned concrete slabs have been installed to meet the very-specific challenges of the Clatterbridge Cancer Centre in Liverpool


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oncretepost-tensioned slabs were chosen to meet specific loading, deflection and vibration criteria at a highly-complex cancer centre project in Liverpool. Concrete slabs from CCL have been installed at the new Clatterbridge Cancer Centre, which was designed by BDP, engineered by AECOM, and constructed by Laing O’Rourke. Occupying a sloping site, the new


centre is an unusual triangular-shaped building with a unitised glazed façade and stepped terraced roof. At the front of the building there is a


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curved cantilevered section, supported by huge raking columns. The viability of different slab strategies was explored at the early concept stages of the project. This analysis led to the decision to


use reinforced concrete (RC) slabs for the basement and ground-floor levels. The remaining storeys, including the stepped cover slab, have all been designed and installed with post- tensioned (PT) systems.


The MRI equipment that will be installed on level 0 is extremely sensitive and there is a pharmacy


located on the top floor where chemotherapy infusions and other treatments will be custom prepared to precise requirements. The equipment used here is also very sensitive.


Good vibrations To provide sufficient concrete mass for the required vibration resistance, the depth of the slab was increased and the vibration control provided was further enhanced by stiffening in the critical areas with a set of deep orthogonal beams.


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