Owner: City of Portland
Partner: Sargent Corporation
Type: Excavation Support
Location: Portland, Maine
Project Description: Drove 1.8 million pounds of sheet pile up to 98 feet deep; installed 1.3 million pounds of internal framework.
Challenge: The combined sewer overflow storage tank required excavating 36 feet below grade in soft soils next to an existing highway embankment.
Solution: Extra lengths of sheet pile were spliced and driven to satisfy global stability requirements. We utilized heavy internal framing to support loads from the soft soils and high water table.