Author: R.K. Filip (RKF Consult Ltd)
3 April 2017
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R.K. Filip (RKF Consult Ltd)
Current highway bridge designs in the UK tend to favour either composite steel girders with a precast or in situ concrete deck for long spans, or precast concrete beams with an in situ concrete deck for spans of less than 40m. This article considers temporary works, in particular the use of temporary supports, to precast concrete bridge beams during deck construction.
A structure in its permanent state cannot be ‘wished into place’. Appropriate consideration must be given to construction methodology so that permanent works can be optimised, temporary works minimised and trade interfaces simplified. This article presents a list of general, high-level considerations that relate to construction methodology and optimisation of temporary/permanent works, with a number of examples provided.
Last month’s article in the series covered the theory and detailed methods recommended for calculating backpropping loads. This article continues by discussing some of the design issues and preconceptions related to backpropping, and gives worked examples.