While performing pre-construction services on a precast parking garage for a forensic engineer, a large crack was noticed at the mid-span of a double tee stem in a parking garage. The unique stressing of the precast parking garage required our project manager to develop a creative double tee stem repair solution. The engineer directed us to excavate into the stem to determine the cause of the crack, where we found that 6 of the pre-stressing strands had corroded and were no longer intact. The double tee had to be shored and would need to be repaired to re-establish its’ structural capacity. The work needed to be fast tracked and done while the garage remained operational.
Restruction Corporation received a sketch from the engineer utilizing Grab-its, post tensioning devices, and pressure jackets to repair the DT stem. The design was not typical and he wanted to make sure the solution is a viable construction solution. We evaluated the design for him and helped determine the geometry and materials that would work. The design allowed us to execute the repair in a short time frame keeping the garage open for use.