Balanced Cantilever Bridge Construction

Balanced Cantilever Bridge Construction

Balanced cantilever construction implies construction of cantilever segments from a pier in a balanced fashion on either side until the mid span is reached and a closure known as stitch segment is made with other half span cantilever constructed from the preceding pier. Segments may be cast in-situ or precast concrete normally with a box shape cross-section.

  • For in-situ balanced cantilever construction, the formwork is suspended from the end of the last segment. The new segment is cast, and once the concrete has developed a predetermined strength, the section is post-tensioned to the rest of the bridge. Segments are often cast and stressed in pairs, one each side of the pier.
  • For precast construction, the segments are lifted up using a lifting gantry at the free end and after placing in position, post tensioned to the rest of the bridge.

Balanced cantilever construction is an economical method when access from below the deck is expensive or practically impossible and in longer spans where launching is expensive.