Hammersmith Flyover is an early precast segmental bridge in west London. It has prestress which is described as external but runs in grouted ducts for some of its length. The prestress was deteriorating seriously and emergency strengthening was installed in 2012.
It was decided in anticipation of further deterioration that new prestress should be installed to make the structure independent of the original. This is believed to be the first time that full replacement prestress has been installed in a bridge where it was not possible to remove the original.
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