limited construction access challenges within the Troy Meadows wetland portion of
PSE& G’s 500 kV Susquehanna to Roseland Electric Reliability Project. Micropile
foundations were constructed utilizing primarily helicopter access for seven 500 kV
double-circuit tubular steel pole structures within the protected habitat. The successful
implementation of a design-build strategy between the overhead design team and the
contractor led to significant refinements in the foundation design. Value engineering
efforts focused on refinement of tower loading geometry and load cases, assessment of
geotechnical conditions, and reduction of foundation footprint within the wetlands
environment. The paper will detail design and routing of the overhead alignment, as well
as permitting restrictions and area of impact limitations. It will then provide an in-depth
analysis of micropile foundation design utilizing concrete pile caps, and a detailed
overview of construction methodologies.
Subjects: troy meadows wetland, micropile foundations, concrete pile caps
Author: Steve Davidow, P.E., S.E., P.Eng., Nick Salisbury
Publisher: ISM, DFI, ADSC