Genesee＆Wyoming Company Alabama＆Gulf Coast Railway（AGR）于1997年从阿拉巴马州的金布拉夫（Kimbrough）到佛罗里达州的彭萨科拉（Pensacola）在阿拉巴马州门罗维尔（Monroeville）开始运营。2003年，AGR从阿拉巴马州的金布拉夫（Kimbrough）扩展到MS哥伦布（MS），来自Al Mobile，通过BNSF铁路运营。他们现在通过密西西比州，阿拉巴马州和佛罗里达州总共经营442英里的轨道。
During a courtesy inspection along one of the tracks, AGR engineers noted that a 132-in. culvert running directly under the track had failed due to age, degradation, and poor installation methods used. The deteriorating culvert had experienced major encroachment along the toe of the slope after a major rain event and catastrophic washouts. Given this advanced degradation, AGR consulted three local contractors for proposed solutions and cost. AGR preferred a method that would allow the railroad to remain in operation while construction took place. Not only would this allow the line to continue unimpeded but would also provide substantial cost savings.
Ultimately, AGR accepted a proposal by Chase Plumbing to slipline the host culvert with 108-in. diameter光滑的cor™, a double wall corrugated steel pipe with a polymer-coated liner and Aluminized Type 2 (ALT2) shell as well as 102-inchTunnel Liner Plateboth manufactured and supplied by Contech Engineered Solutions. The Smooth Cor was inserted on struts from the south end. During this process, a partial collapse occurred directly under the rail which required an emergency hand lining with Contech’s 7 gage, 2-flange Tunnel Liner Plate for roughly 10.5 LF. The full length corrugations and lapped joints inherent with 2-flange Liner Plate provide more effective stiffness and ring compression and was ideal for relining this portion of the culvert. Smooth Cor was then used to line the rest of the length of the host pipe for a total of 117 LF installed.
Once the host was relined, the entire structure was grouted in multiple stages with a non-shrink grout while a low maximum grouting pressure of < 5 PSI was maintained. The end result was a fully structural repair with both significant time and money saved. The original pricing for open cut and replacement was upwards of $500,000. AGR was extremely pleased with the outcome of relining the host pipe which cut the original estimated cost by roughly 40%.
