Versatility of Compaction Grouting to Stabilize and Lift Large Structures-PPT Presentation

PPT Presentation

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The presentation describes two applications of compaction grouting to stabilize and lift large structures.<br /><br />At Dakota Mill & Grain in South Dakota, a 105-foot-diameter grain bin had experienced differential settlement of about 5 inches. Compaction grout columns were installed at 5-foot spacing, using inclinations of 5, 10, 15, and 25 degrees. Work followed primary, secondary, tertiary, and quaternary sequencing. Casings were pneumatically driven through the concrete footing; for re-leveling, casings were drilled back through completed grout columns.<br /><br />In Draper, Utah, compaction grouting was used to lift and stabilize a multi-story structure. Settlement estimates based on the building’s original construction helped determine the lift required to return it toward its pre-settlement levels. Crews exposed both interior and exterior footings and used penetrating radar to locate core holes that avoided reinforcing steel. Grout piping was installed to the design depth, and grout was pumped at interior and exterior locations to limit foundation rotation.<br /><br />The grouting design targeted a depth of 50 feet, with injection at 1-foot intervals and 5 cubic feet of low-mobility grout per stage. A lifting section was left at the top of each completed column, then grout was pumped into those sections to raise the structure. Push piers were also used at the core to provide lift without applying pressure to the mechanically stabilized earth (MSE) wall.

Keywords

compaction grouting

settlement stabilization

structural lifting

grain bin repair

differential settlement

grout columns

foundation leveling

pile sequencing

penetrating radar

push piers