Maine Medical Center, The Story of an 80 ft Tall Permanent SOE Constructed through a Maze of Buried Utilities and Deep Foundations-Video

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Video Summary

The presentation describes a permanent excavation-support system for a new medical office building at Maine Medical Center. The design reused part of a 50-year-old reinforced-concrete parking-garage wall, combined it with a secant-pile wall, and restrained both with high-capacity tiebacks. Investigations—including concrete and reinforcement testing and 3D laser scanning—confirmed the existing wall could carry part of the required loads.<br /><br />Construction was challenging because excavation and drilling took place near critical hospital utilities, foundations, and other structures, while the campus had to remain operational. The team modeled the site in Revit, mapped potential conflicts, categorized tiebacks by risk, and developed detailed installation procedures. Surveyed positions, alignment pins, obstruction records, and gyroscope measurements helped verify high-risk tieback locations. Movement monitoring and redundant tieback design further reduced risk. The presenter emphasizes that early coordination among the owner, engineers, contractor, and specialty installer was essential to the project’s success.

Keywords

permanent excavation-support system

Maine Medical Center

secant-pile wall

high-capacity tiebacks

reinforced-concrete parking-garage wall

3D laser scanning