(Info From BBR Holdings)
With the cantilevering method, the superstructure of bridges is usually built from one or more piers by means of formwork carriers. Normally the structure advances from a short stub on top of a pier symmetrically in segments of about 3 m to 5 m length to the mid span or to an abutment, respectively (load balancing method).
The prestressing tendons are arranged according to the moment diagram of a cantilever, with a high concentration above the pier. Towards the mid span or the abutment the number of tendons gradually decreases.
The use of the cantilevering construction method, for medium and long span concrete bridges, is recommended especially where a scaffolding is difficult or impossible to erect as e.g., over deep valleys, wide rivers, traffic yards or in case of expensive foundation conditions for scaffolds.
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