Author: C. Bennion (Kier Group)
2 May 2017
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C. Bennion (Kier Group)
This article considers temporary works, in particular the use of temporary supports, to precast concrete bridge beams during deck construction.
The article is aimed at permanent works designers involved with the design elements of this form of construction, as well as civil and structural engineering undergraduate students.
The permanent works designer (PWD) has a major influence on the temporary works and can, for example: eliminate temporary works, e.g. through the use of steel decking rather than timber falsework minimise the use of temporary works, e.g. by using the permanent capping beam as a waling in basement construction design the permanent works so that simple temporary works solutions can be used.
This article explains the theory and background to backpropping and gives advice on the methods recommended to be adopted for backpropping calculations. It looks at the physics involved and how engineers and designers can mitigate damage to concrete slabs during construction.
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.