US 62 Bridge Over The Tennessee River
Marshall County, KY
The project consisted of drilling services for drilled shafts which were found to be defective during post-construction inspection. Defects in the drilled shafts were discovered during the cross-hole sonic logging analysis. Pressure grouting was performed on the drilled shafts to remediate the defects. Rock core operations were provided to help validate the pressure grout treatment and provide confirmation of drilled shaft capacity, including deep rock core borings that were advanced inside temporary steel casing. Special aspects of this project included work over water from a platform suspended on top of temporary drilled shaft casing, and drilling through fresh concrete, grouted intervals and fractured bedrock to depths in excess of 100’. This difficult drilling operation included borings which were conducted from a platform suspended on top of the temporary casing. Significant coordination with the contractor, Richard Goettle Inc., was required to ensure the appropriate overall support, crane placement, barge service and platform assembly were provided for this unique mission. A total of three foundation borings were advanced to depths in excess of 100’ to investigate the effects of pressure grouting within recently constructed drilled shafts. High quality rock core samples were recovered utilizing accepted drilling methods. Following rock core operations, each boring was grouted from the bottom of boring to the top of drilled shaft.