A segmental bridge is a bridge built in short sections (called segments), i.e., one piece at a time, as opposed to traditional methods that build a bridge in very large sections.

Utilization of an elevated viaduct type structure requires only a rela-tively narrow path along the align-ment to provide access for pier con-struction. Once the piers have been constructed, all construction activity is from above. Thus, the impact on the environment is minimized. Also, be-cause the structure is elevated, as op-

Chapter 4: The Construction Process of Segmental Bridges 160 are installed in tendon ducts that are made from steel or polyethylene. The ducts need to be fixed to the normal reinforcement to prevent misalignment during casting.

Feb 11, 2021 · The cantilever launching gantry can move along the viaduct, allowing implementation of the segments. Considering the specific case of the modular precast cantilever Navile Bridge, a launching gantry weighting 178 tons has been employed; each cantilever arm consists of 11 segments, each 3.35 m long.

Completed in 1982, the Linn Cove Viaduct, part of North Carolina’s Blue Ridge Parkway, was the first concrete segmental bridge in America to be built in one directional cantilever from thetop down to protect fragile environment.

The Ngong Shuen Chau Viaduct consists of two types of structures, namely precast segmental and cast-insitu bridge decks. The former is dominant form of the viaduct while the latter is used only in two ramps connecting the segmental decks to at-grade roads. The precast segmental structure consists of 192 spans of single cell box girder.

One of the 9 ft (2.75 m) deep precast segments for Linn Cove Viaduct being trucked to construction site. The segments were cast inside a building about a mile (1.6 km) from bridge. Indoor casting was necessary due to severe weather of the …

Balanced cantilevers of the main bridge of the Ventabren Viaduct to be rotated across one of the most congested motorways in France. Photo: VINCI Construction Grands Project-France. Placing the first spans using the progressive construction technique with temporary cables on the South Europe-Atlantic Viaducts. Photo: VINCI

A Segmental Bridge is a bridge built in short sections (called segments), that is one piece at a time, and then segments are erected to make the bridge. The bridge is either cast-in-place or precast. Very economical for long spans. Prefabricated segments provide more quality control.

Details and supporting calculations for any modifications to segment geometry, cross section dimensions, or segment length including any required changes to reinforcing and post-tensioning.