Once Selmon Extension construction crews set the full span of segments between each pier, they’re pulled together with post-tensioning, which is a technique for reinforcing concrete. Here’s an example of similar post-tensioning cables that will be utilized to hold the segments together.
There are multiple sets of post-tensioning strands ranging from 12-strand to 29-strand cables. The individual strands are supplied in large coils and are fed, one at a time, into the concrete-encased conduits to create each bundle. Each bundle of strands is tensioned using large hydraulic jacks weighing from 600 pounds to 1200 pounds.