Congress Heights Metro Station
Kirlin continued its long history of successful projects for Washington DC's Metrorail system with the opening of the Congress Heights Station on the subway's Green Line. The opening of this station marked the completion of Metro's original plan (commenced in 1968) for the 103-mile transportation system.
Construction of this 100-foot deep underground Metro Station required a retention system consisting of a soldier beam and lagging system supported by cross-lot bracing. The station included a 1,000-foot long underground installed structure and two 1,500-foot tunnels. The ventilation systems were integrally constructed with a fan shaft at Mississippi Avenue.
All underground stations are environmentally controlled with redundant fresh air changes to suitably sustain varying passenger levels. The mechanical systems included a new central heating and cooling plant, air compressors, computer room air handling units and specialized drain systems. Factory pre-insulated piping was installed for underground thermal distribution. Kirlin has also developed unique techniques for pipe racking along the track lines that has minimized fabrication on site within the tunnels.