Geometrical Control in Span by Span Cast in Situ Construction of Bridge Decks

Geometric control of concrete bridge decks under construction is strongly dependent on the construction method. Different construction methods demand for different geometrical control strategies and different geometric control technologies. Geometric control is usually a major concern in segmental construction solutions, both in precast and cast-in situ. Geometric control dependency is apparently lesser in span by span cast in situ construction. The consequences of a defective control are apparently affordable and as a result this issue is often neglected. However, defective geometric control often leads to expressive costs with surface regularization, either by overconsumption of materials or corrective milling works.

This paper focus on geometrical control in span by span cast in situ construction of bridge decks, referring to practical cases using movable scaffolding systems (MSS). A global control strategy is discussed, identifying the most significant factors, the relevant steps and the involved parties.