Multiple Installation Systems to Limit SOE Impacts to Aging Infrastructure in the Nations Capital-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes temporary support-of-excavation (SOE) work at Buzzard Point in Washington, DC, an area shaped by the historic intersection of the Anacostia and Potomac rivers. The project faced challenging ground and site conditions, including a high water table, groundwater seepage, underground obstructions, active electrical lines, and tight construction tolerances.<br /><br />A key concern was protecting a 90-inch combined-sewer overflow pipe made of reinforced concrete pipe dating to the 1930s. The team used 80-foot sheet piles to safeguard the utility. Other obstructions, including underground tunnels and fragile terracotta utility supports, required changes to the soldier-beam layout and careful installation planning.<br /><br />An accelerated schedule required multiple operations to proceed concurrently and the use of different installation methods. Equipment included cranes with impact diesel and suspended vibratory hammers, a piling trestle, and an RTG21T equipped with a silent vibrator.<br /><br />To manage risks and track effects on surrounding infrastructure, the project used extensive instrumentation and automated monitoring. Systems monitored groundwater levels, shoring, inclinometers, the sewer outfall, surface settlement, utilities, nearby structures, and manholes. The presentation highlights how varied installation techniques, design flexibility, and monitoring helped address the project’s constraints while limiting impacts to aging infrastructure.

Keywords

temporary support of excavation

Buzzard Point

Washington DC

sheet piles

groundwater seepage

combined sewer overflow pipe

soldier beam layout

construction monitoring

excavation shoring

utility protection