Underpinning of Historic Structures-Video

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Video Summary

The presentation covered two shoring projects in Washington, D.C. At City Ridge, a historic former Fannie Mae headquarters was renovated into a mixed-use development with underground parking. Inside the existing building, 385 steel-cased micropiles supported columns during excavation, with loads transferred through jacking frames. Soldier-pile walls, tiebacks, soil nails, and internal bracing supported extensive site excavation.<br /><br />At the Milken Center, two historic buildings were renovated to add upper levels and lower basement areas while preserving a historic vault door. More than 300 micropiles supported temporary shoring towers along two 100-foot-long bearing walls. Needle beams connected the walls to transfer beams, and pancake jacks gradually preloaded the system to limit stress on the old masonry. Both projects required careful coordination, restricted-access construction, and protection of existing structures.

Keywords

shoring projects

Washington DC

micropiles

historic renovation

excavation support

temporary shoring