Commercial Foundation Repair in MO & IL, including St. Louis, Springfield & Champaign.

Commercial Foundations Case Studies: Westbrooke Village Apartments

Wednesday, March 2nd, 2016 by Dave Thompson

Challenge

New owners of a 250-unit apartment complex planned for a multi-million-dollar renovation, prompting a re-inspection of all buildings on the property by the local municipality. The complex includes multiple, 20-car-capacity parking structures consisting of poured concrete retaining walls which transition to columns that support wood-framed roofs. Four of the parking structures did not pass inspection because their retaining walls were found to be bowing or leaning inward three to eight inches.  Many tenants would remain at the complex during renovations; therefore, the owners wished to repair and reopen the parking structures as quickly as possible.

Solution

The owners considered removing and rebuilding the parking structure walls, but ultimately chose a more expedient and cost effective solution to straighten and support Rods set to be driven through wall and the failing walls using GeoLock Wall Anchors. GeoLock Wall Anchors have an allowable attached to plate anchor tension capacity of 14 kips. The GeoLock Wall Anchor System consists of a steel wall plate, a steel plate anchor buried in the ground, and high-strength all-thread connecting m rod. All components and hardware are hot-dip galvanized for corrosion protection. 

Each parking structure required thirty (30) wall anchors. Wall plate locations were marked on the inside faces of the walls, and the corresponding locations for the plate anchors were staked. Excavations were made behind the walls to remove the lateral  earth pressure so the walls could be straightened. While excavating behind the walls, concrete counterforts were discovered, which had to be saw-cut from the walls and at least partially removed to allow wall straightening. Individual excavations were made Plate anchor connected at the proposed plate anchor locations approximately 18 feet from the front face of the walls. At each anchor location, a 0.75-inch diameter all-thread rod was driven through a 1.125-inch hole in the wall, through the soil, and into the pre-excavated hole. A plate anchor and wall plate were then connected with the all-thread rod. Anchor spacing -varied based on wall and backfill height with a maximum center-to-center spacing of six feet. With all 30 anchors installed per structure, the anchors were systematically tightened and locked in place. Connections were then re-established between the concrete columns and the roof systems. The excavated areas were backfilled, compacted, and seeded.

Project Summary

Structural Engineer: Berthold Engineering Company

General Contractor: ACR Construction

Certified Anchor Installer: Foundation Supportworks by Woods

Products Installed: (120) GeoLock Wall Anchors, 18-foot Lengths, Maximum 6-foot spacing.

About the author
Dave Thompson waterproofed his first basement at the age of 15 and the old scrape and black tar method worked on his Grandfather's home for 6 years. For the last 14 years he has been actively involved with doing it better, keeping basements dry all the time, repairing foundations and dirt crawl spaces too, with Woods Basement Systems.
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