Deep Foundation

St. Louis Art Museum

St. Louis Art Museum micropiles, micropile, micropiles, micropile contractor, ground improvement, ground improvement contractor

Micropiles for renowned St. Louis institution

Subsurface Constructors recently completed the design and installation of micropiles to support the new basement floor in a display area of the iconic St. Louis Art Museum. The original slab cracked over time due to the heave and desiccation of the high plastic clay supporting it. Subsurface used a 7 ⅝” diameter micropile installed in 1m sections inside the basement. The piles were originally designed as friction piles in the clayey shale below the high plastic clay. However, limestone was encountered in several locations and the piles were founded on the limestone in some locations.

St. Louis Art Museum micropiles

Completed piles had a center bar grouted in place that tied into the new slab. This would provide the necessary resistance and support for any future movement of the high plastic clay.

St. Louis Art Museum micropiles

Access of the low overhead micropile rig took place at night while the museum was closed, and the rig was tracked along the finished corridors of the museum using plywood sheets to protect the floor. Subsurface used a hatch along an exterior wall to lower materials and workers into the area.

Project details:

Owner: St. Louis Art Museum
Geotechnical Engineer: Shannon & Wilson
General Contractor: ICS
Structural Engineer: HOK
Services Provided: Micropiles
Year: 2019
Location: St. Louis, Missouri

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