Colonial Road Bridge Replacement & Pocket Track Extension
AI provided resident engineering and inspection services and oversight of the contractor’s daily work and verified conformance with contract drawings, specifications, and relevant contract documents on this LIRR Design-Build project. This project included the extension of the existing pocket track, improved drainage at the track level, and the replacement of a bridge. Work included right-of-way clearing, earthwork, retaining walls, bridge replacement, signal modifications, switches, crossovers, interlocking, and drainage improvements.
AI staff directly reported to the LIRR Project Manager and acted as the on-site representative with respect to enforcing the daily coordination, quality of work, inspection, testing requirements, LIRR design guidelines, construction requirements, current industry practices, and federal regulations.
Colonial Road Bridge is a historic multi-span steel truss structure carrying two lanes of local traffic over a very active LIRR track. The bridge was built circa 1887. The bridge was replaced with a concrete arch structure, which essentially acts as a short tunnel structure over the LIRR track. Both the railroad track and Colonial Road were realigned to provide for enhanced sight distance, improved drainage, and an extended pocket track (approximately 1,200 ft. long).
The project included significant earthwork, dewatering, slope stabilization, drainage, concrete encased electrical duct banks, concrete spread footings, precast and cast-in-place arch sections, reconstructed pavement, signage, and landscaping. There were two basic elements of work. The first element was the replacement of an 1890s multi-span, two-lane, steel truss bridge with a steel grid deck and a concrete arch structure, and the second element was to create a pocket track parallel to the main line.
The whole project was wedged between a narrow right-of-way defined by the backyards of an affluent neighborhood on one side and a busy local street on the other (approximately 150 ft. wide and 1,500 ft. long). The commuter rail line was active with two to four trains per hour around the clock. There were major utilities being relocated, large drainage structures installed, significant dewatering efforts, and aggressive earthworks.
2015 - 2017
- Utilities relocation
- RR coordination
- Active rail line
- Bridge construction
- Earthwork, dewatering, and slope stabilization
- Retaining wall