A box girder bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The box is typically rectangular or trapezoidal in cross-section. In modern high-speed railway lines, box girder bridges have become one of the most popular solutions for spans between approximately 20 m and 45 m. This success is attributable to their short construction time,which is largely due to the prefabrication of the main girders.

For steel box girders, the girders are normally fabricated off site and lifted into place by crane, with sections connected by bolting or welding. If a composite concrete bridge deck is used, it is often cast in-place using temporary falsework supported by the steel girder.

Either form of bridge may also be installed using the technique of incremental launching. Under this method, gantry cranes are often used to place new segments onto the completed portions of the bridge until the bridge superstructure is completed.

Advantages of Steel Box Girder Bridges as Railway Bridges

*Reduces the slab thickness and self-weight of bridge

*Cost effective

*Greater strength per unit area

*Quality assurance, as precast steel girders are made off-site

About FAMOUS

FAMOUS has made a name for itself in the list of top steel structure manufacturers in China. Serving contractors, developers and architecturers worldwide since a decade ago, we offer a variety of steelwork fabrication services including, but not limited to: 

* Free estimate and technical proposal for your project.

* Professional CAD design engineering service.

* Steel structures components fabrication in EU, U.S. and AS/NZS standards for bailey bridge, truss bridge, beam bridge and box girders.

* Steel framing structures fabrication in EU, U.S. and AS/NZS standards for commercial, industrial or recreational buildings.