There are so many permutations in bridge design that this will always be a difficult one to answer. Here in the North East we, as a group try to work this out based on actual construction data and then generate a mean with std deviations of acceptability. but as at today we haven't finished this yet. Here in Benalla, we are currently using $1,533 for precast crown units or major culverts and $3,066 for Bridges (close to Gunnedah's $3,008). However more work needs to be done to account for the different types and number of spans, maybe a SQM rate/ span and then add a unit rate for piers then recalculate, open to discussion.
What I extracted from Rawlinson (p723 current edition) was $1655/sqm for composite deck and $2735 for abutments which opens the question on componentisation. I am going to move towards Deck, Superstructure, Substructure, abutments and furniture.On Rawlinsons, I approached them to produce a unit rate handbook for the types of assets we deal with, given they have a lot of the data anyway, but they were not interested! Probably a guarantee sale to every council if they did!
Where is the IPWEA Practice Note for Bridges when you need one!
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