Bailey Prefabricated Steel Bridge

The Bailey prefabricated steel bridge​ is a modular, truss-type structure designed for rapid construction and heavy load capacity. Invented by British engineer Sir Donald Bailey in the early 1940s, it was first used by Allied forces during World War II to quickly replace bridges destroyed in combat. Today, it remains widely used in military, emergency, and civil engineering projects around the world.
Structure and Components

The bridge’s strength comes from standardized, interchangeable steel panels that are bolted together to form trusses. Its main components include:
Panels: Rectangular steel trusses that form the main load-bearing framework.
Transoms: Horizontal beams that connect the panels and support the deck.
Stringers: Longitudinal beams placed on the transoms to carry the decking.
Decking: The roadway, made of timber, steel grating, or composite materials.
Bracing and End Frames: Diagonal and horizontal members that provide rigidity, along with end frames that transfer loads to the abutments.
By arranging panels side-by-side, in multiple layers, or in longer bays, engineers can create bridges of various lengths and load capacities from the same set of components.