Project Dates: June 2009 – Present
Project Costs: Construction Cost $6,858,300.00
This project entails constructing a signature steel pedestrian overcrossing over Treat Boulevard in the Pleasant Hill BART area. The overcrossing provides for pedestrian and bicycle safety when crossing the heavily travelled Treat Boulevard. The bridge will also link discontinuous sections of the Iron Horse Trail.
The work consists of constructing a multi-span pedestrian bridge comprised of a steel arch main span with a composite steel, concrete bridge deck, and concrete approach structures founded on cast in drilled hole piling; additional work to be done consists of roadway excavation, installation of asphalt concrete pavement, curb and sidewalk, modify and constructing drainage system, installing new landscape and irrigation systems, modifying existing signals and lighting.
Located over a busy Treat Boulevard at the main entrance to the Pleasant Hill Bart Station, the project was constrained and challenged with various issues that included an un-anticipated PGE overhead wire power shutdown, difficult foundation installation using the “wet-hole” method, restricted construction access, working adjacent to businesses, residential neighborhoods, environmentally sensitive areas and bridge erection in the middle of Treat Boulevard. Hanna group Representatives were also charged with providing public outreach for all traffic closures and PG&E outages related to pile placement and Bridge Erection. With the added challenges, The Hanna Group is scheduled to deliver the project early for the County of Contra Costa and under budget.
This project consists of constructing a bicycle/pedestrian bridge along the Iron Horse Trail alignment, crossing Treat Boulevard in the vicinity of Jones Road. The bridge provides a grade separation between traffic on Treat Boulevard and bicycle/ pedestrian traffic on Iron Horse Trail. The Iron Horse Trail is a Class I bikeway facility that parallels the full length of I-680 in Contra Costa County and provide bicycle/ pedestrian access to the BART station.
This project has a multitude of technically challenging components that required the structural expertise that the Hanna Group brings. Hanna Group engineers were charged with constructing and analyzing an independent 3D Model, confirming proper suspender cable tensions and lengths, performing clean and paint structural steel inspection, monitoring member forces of fracture critical members, ensuring final stressed structure geometry, and ensuring proper structural fit-up under tight steel tolerances.
The Hanna Group’s scope of work consists of construction management services including but not limited to the following: