T.Y. Lin International (TYLI) provided Phase I Planning Services and Phase II Design Engineering/Architectural Services for the new Cermak Elevated Green Line Station for the Chicago Department of Transportation and the Chicago Transit Authority (CTA).
Featuring an aesthetic structural steel tube that serves as a windbreak for the passenger boarding areas, the station fills an important transportation gap in Chicago’s Near South Side, provides improved access to the McCormick Place convention center campus, and supports the city’s efforts to revitalize the newly designated Motor Row entertainment district.
- The new, fully accessible station was built into and around an historic, 100-year-old elevated rapid transit structure, while maintaining full transit service.
- For Phase I, TYLI prepared three alternative station designs and space layouts for each level.
- Other work included a CTA system analysis and recommendations for signal, communication, and train traction power improvements, a topographic survey, and a geotechnical program.
- TYLI coordinated with affected utilities and the City of Chicago Board of Underground to develop a utility mitigation plan.
- For Phase II, TYLI coordinated all subconsultant deliverables, developed and implemented a Quality Assurance Plan, and prepared complete contract documents, including plans, specifications and construction cost estimates and construction schedules.
- All phased construction was completed within the existing right-of-way.
Following a detailed structural inspection of the CTA’s existing, century-old steel elevated rail structure, TYLI engineers provided a detailed structural analysis of its steel framing system. The structure was then rated for potential retrofits. Based on the load rating, it was decided that the platform for new station would be built independent from the existing track structure to avoid additional loads to the track stringer or bents.
TYLI’s design for the platform pushed the structural components to the outside, providing an enclosure that offers passengers maximum open area for boarding and de-boarding and successfully addressing the maximum platform width of 15 feet. Work to accommodate the tube and platforms included the addition of six reinforced concrete piers between the existing steel bents.
- Public Works Project of the Year, 2016
American Public Works Association (APWA)