Lone Oak Missionary Baptist Church

Challenge

The Sanctuary building constructed in 1983 experienced settling issues in 2009, mainly at the Northeast quadrant of the building. An engineers investigation by another firm and repairs by another contractor were completed in July of 2009. Soon after this work was completed more settling was observed. West Coast Forensics Consulting Group, Inc. was hired to investigate and found the original repair was not adequate.

Solution

West Coast Forensics Consulting Group, Inc. recommended additional compaction grouting was needed to stabilize the deep soils. This was accomplished utilizing 50 grout points to an average depth of 85 feet. In addition it was recommended that the perimeter of the structure, the interior slab, load bearing walls and column footers be underpinned. This was accomplished with 76) exterior 3" push piers to an average depth of 58 feet around the perimeter of the structure. 23) interior slab brackets to an average depth of 75 feet. 34) 3" push piers with retrofit brackets at the load bearing walls and interior column footings. Upon completion of the underpinning a 1,000 lbs of Polyurethane Grout was installed below the slab, to fill the voids between the slab and the underlying soils.

Project Summary

Geotechnical Engineer: Westcoast Forensic Consulting Group, Inc

Contractor: LRE Foundation Repair Inc

Products Installed: 133 Total Piers

Interior: 23) ISB-07 slab brackets and 34) retrofit brackets at the load bearing walls and the interior column footers to an average depth of 75 feet

Exterior: 76) push piers to an average depth of 58 feet.

Compaction Grout: 50 points to an average depth of 85 feet.

Chemical Grout: 1,000 lbs installed under interior slab