An existing timber bridge crossing a CSX railroad in Troup County, GA, required replacement due to its deteriorated condition. A 50’ span CON/SPAN® structure was designed to carry traffic on Jefferson Street over the tracks for this Georgia Department of Transportation bid project.
“Both a PSC and steel bridge alternates were investigated, but that would have entailed raising the profile of Jefferson Street considerably, which would have impacted the rightof- way of adjacent properties,” said Hisham (Sam) Deeb, PE, Director of Structural Services for Moreland Altobelli Associates, Inc. “To minimize that impact, the 50’ CON/SPAN® units provided a lower structure while still mantaining the stringent clearance requirements of CSX railway.”
“Moreover, the speed at which a CON/SPAN® is placed rendered that option more appealing since it eliminated prolonged construction closures of a track with considerable traffic,” said Deeb. As many as 14 trains passed through the site each day, which threatened to delay the installation. Crews, however, worked efficiently to accommodate the trains, and the CON/SPAN® installation was completed in just three days.
The 50’ span structure allowed for a standard CSX horizontal clearance diagram complete with drainage ditches on both sides of the single rail line. 21’-1” tall cast-in-place retaining walls elevated the arch units to allow for 23’ tall vertical clearance at the track level.