Milwaukee City Hall Foundation Restoration
- Location Wisconsin
Michels constructed a temporary earth retention system, excavated the work area, and installed 218 micro piles to depths between 25 to 45 feet around existing wooden piles on Milwaukee City Hall's north end which has settled 2 inches since 1986. The structure was initially supported by more than 2,500 untreated wooden piles driven into a filled tamarack swamp. A drill attached to an excavator at street level was used to build most of the exterior piles. About 400,000 pounds of cement was mixed at street level by Michels' on-site batch plant and pumped into the micro piles to form cement columns. All of the work was done at night to avoid interfering with City Hall operations on a small site in a congested area.