A Flat Arch Bridge Construction Method and Its Temporary Stability
This case study paper concentrates on the construction method adopted with associated temporary works for a recently completed steel-concrete composite flat arch bridge in the city of Northampton (UK). The new road alignment over the navigation channel of the river Nene imposed an arch with span to rise ratio of 13.9. The 50 m span alternative tender design was led by the site constraints with limited access for heavy construction plants due to the presence of a significant numbers of existing buried utilities. The mobile crane lifting arrangement is discussed together with the related restricted crane platforms and temporary supports. The stability verification during erection of the steel arch is presented with discussion on the details for the temporary bracing that was required prior installation of the cross girders. The stage by stage construction is described including the design details that needed to allow for geometrical tolerance in the installation of the steel structure within pre-set reinforced concrete thrust blocks as part of the buttressed abutments.
KeywordsArch Construction Stability
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