Author: Concrete Bridge Development Group (CBDG).
27 November 2014
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Concrete Bridge Development Group (CBDG).
This month’s article from the CBDG’s Technical Committee examines the construction methods for the six basic types of precast concrete bridge: • Standard precast inverted T/Y, I or U beams • Bespoke precast T, I or U beams • Precast segmental box girders with short segments • Whole span precast box girders • Incrementally launched box girders • Modular precast system with short shell segments
In situ options tend to be used on projects where the speed of construction is not critical, or where the lower costs of the in situ works justify a slightly longer programme.
This article examines the detailing that is particular to a concrete bridge. All details need to consider buildability, durability and maintainability, as well as safety and aesthetic issues.