Foundation Repair: Arizona Home on the Edge Part 3 – Challenges
Retaining Wall and Home Stabilization
Cost of the project: $121,500
Project Start Date: August 2008
Project Finish Date: January 2009
Structural Engineer: Gervasio & Associates
Geotechnical Engineer: Copper State Engineering
Having construction errors (part 1) and a structural engineering design completed (part 2), this particular home’s foundation repairs presented numerous access challenges for us.The retaining wall was located at the far side of the house with very little access for equipment needed to install the various solutions.
There was a path leading to below the wall, however, it had in some places a cross slope of more than 45 degrees. In addition, the area below was considered a preserve area, precluding the use of permanent retaining walls for equipment access. Even the use of temporary concrete retaining walls was rejected due to fear of debris and soil during removal sliding down and contaminating the preserve. There was no room for equipment above the wall for equipment to reach down below.The temporary methods chosen to provide access and construct the designed repairs included:First, install the helical piles under the house foundation. Second, install temporary helical piles vertically in the soil 6’ in front of the retaining wall. Some of these needed to be installed with hand equipment due to the slope and access restrictions. Third, install temporary tiebacks into the existing wall.
Artisans installing temporary helical piles
Artisans installing temporary railroad ties
Welding up temporary steel bracing
Placing the temporary sand bag fill
Next, a steel frame work was welded connecting the temporary tiebacks to the temporary helical piles. Then Railroad ties were then placed inside the framework parallel to the retaining wall as a temporary retaining wall. Finally sandbags were loaded inside of the railroad ties as temporary fill, and minimal grout was used on top of the bags to provide a stable work surface. All this site preparation for part 4 … the foundation repair work.
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