As a subconsultant, SI Engineering, P.C. (SIE) provided construction management services for the construction and closeout phases of the structural rehabilitation of the 4th Avenue Line from 39th Street to 60th Street. The project involved the rehabilitation and repair of the structural defects of approximately 1.1 miles of the tunnel on the Broadway Line on the 4th Avenue Line.
The scope included three (3) stations: 45th Street, 53rd Street, and 59th Street. The existing tunnel consists of four (4) tracks, two (2) local and two (2) express, from 36th Street Station to 59th Street Station.
The work consisted of steel and ventilator repairs, repair and replacement of corroded structural steel beams and columns, connection angles, rivets, wing plates, knee braces, and other items related to beams and columns, replacement of the concrete around column bases along with the concrete encasing beams, replacement of tunnel lighting fixtures and associated switching equipment, repair of damaged sections of the track, cleaning and removing debris from the ventilator drip pans and ventilator shafts, and cleaning the drains. The project also involved maintaining, protecting, wrapping, and supporting positive and negative cables, all existing equipment boxes, and conduits that interfere with the structural rehabilitation and repair work, as well as maintaining, protecting, and providing temporary supports to existing signal equipment and cable at structural rehabilitation and repair sites, and lead abatement for the painting of the repaired structural steel. On the street level, the project involved demolition of the concrete traffic median. The median was replaced with concrete drip pans to prevent flooding.
