Home » Products » Prefabricated Bridges » The Tunable Bridge

Prefabricated Bridges

The Tunable Bridge

Big R Tunable Bridge carries pedestrians across turnpike and rail lines.Big R Tunable Bridge from AIL, underside detail view of pedway.

A revolutionary breakthrough in bridge design.

With clear spans of up to 122 m (400'), The Tunable Bridge is a structural hybrid that’s long on possibilities and short on costs.

The Big R Tunable Bridge combines the physics of a tied arch with any standard steel truss system or girder superstructure and features an innovative adjustable structural system to balance the live and dead loads between the arches and trusses. With no fracture critical members, this redundant stress sharing system increases safety and allows for lighter, lower-cost material and longer, more graceful designs.

The resulting design is lightweight, economical, easy-to-install and very attractive. Ideal for spanning high-traffic corridors or difficult terrain. The modular components install quickly and have all pins and connectors visible for easy inspections.

Benefits

  • Lightweight
  • Economical
  • Easy-to-install
  • Very attractive

Applications

  • Highway and rail crossings
  • Stream Crossings
  • Recreational Trail Bridges

How The Tunable Bridge works:

tunable-truss-drawing-2

  • The tied-arch sections are attached by adjustable, tension hanger rods to balance the live load.
  • Longitudinal, tightening rods pre-stress the truss modules for dead load before installation.
  • Fine-tuning adjustable arch and truss rods ultimately balances live and dead loads between the two systems.
  • With no fractures critical members, this redundant stress sharing system increases safety and allows for lighter, lower-cost material and longer, more-graceful designs.

Big R Tunable Bridges from AIL install quickly and provide safe and efficient solutions for extra-long spans.

Big R’s Tunable Bridge reaches across light rail station and
            highway.Big R’s Tunable Bridge spans multi-lane highway and light rail
            station.Detail view of Big R’s Tunable Bridge, spans of up to 120 m
            (400’)

Ped-Bridge(thumb)
 

Learn more about AIL's Pedestrian Bridges

» Download the brochure
Short-span-steel

Save time and money on bridges

Dave Rogers, of Big R Bridge, on factory-built vs. field-built.

» Watch the video
East-West(lure2)
 

Big R bridges from east to west

Big R Prefabricated Bridges are saving time and money — from east to west.

» Explore this project
036(lure)
 

Fast bridge replacement

AIL helps get displaced residents home in no time with a speedy replacement bridge from Big R.

» Explore this project