Erection of Precast Beam Bridges with Twin-Truss Launchers

Precast beams are often the least expensive solution for prestressed-concrete bridges with 20-60m spans. When good access to the deck is available throughout the bridge, ground cranes usually give the simplest and most rapid erection procedures with the minimum of investment. Tall piers, steep slopes, ground obstructions, crossings of rivers, infrastructures or wetlands, and marine operations often suggest beam erection with self-launching gantries.

In 20 pages, Erection of Precast Beam Bridges with Twin-Truss Launchers explores configurations, operations, kinematics, loads, performance, productivity and structure-equipment interactions of this family of self-launching gantries. It examines the span cycle time for beam delivery on the ground and on the deck with advancing pickup bay along the completed bridge, and explores the loads and stiffness interactions to consider for the design of bridge piers and bent caps.

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