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| Pressure Grouting
| Case Study |
Project: Chesapeake City Courts Building Chesapeake
Virginia
Description- The new courts building were
experiencing settlement of a column footing. Column Footing
D-1 experienced ¾”+/- during construction. The
structure over the pier area is 4 stories above grade with
steel columns and beams supporting concrete slabs over metal
decks.
The resulting settlement most likely was due to tunnel construction.
The tunnel joins the new courts building with the existing
jail and runs under Albemarle Drive.
Column D-1 is 11’6” square and 2’2”
thick. It was constructed on undisturbed soils and is 15’
below finished floor to the footing base. The footing had
been backfilled, slabs poured, and the contractor was ready
to install the interior framing systems and exterior finish.
Solution- Compaction grouting to compact/consolidate
sub-soils surrounding and under footing
D-1. A total of 8 injection points were installed to a depth
of 18’6” below finished floor. A total of 56.8
Cu. Ft. of grout was injected resulting in slight lift of
the structure. As instructed by the engineers only slight
lift was desired to confirm compaction. McCallum Testing performed
soil borings upon completion of the work. |
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