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Innovative and Contributing underground spaces

Union Square Market Street Station - Battered Drilled Shafts as Permanent Ground Support

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The Union Square Market Street Station (UMS) is an underground station that is being constructed as a part of the Central Subway Project in San Francisco, California. The entire project is a 1.7-mile-long subway extension with three underground stations and one surface station. The Project will improve public transportation by extending the Muni Metro T Third Line through South of Market District, Union Square and Chinatown. The south entrance will be integrated with the existing BART/MUNI Powell Street Station, providing a direct connection between the two transit lines. To the north, the main entrance will be at the south-east corner of Union Square on Geary Street.

A portion of the famous Union Square Garage and Plaza will be repurposed to house the main points of egress as well as two emergency ventilation shafts. The station is approximately 950 feet long. Its overall configuration is divided into three areas: the North Concourse, the Platform and the South Concourse. The North Concourse is about 200 feet long and 55 feet below the roadway. The Platform is approximately 400 feet long and ranges in depth from 90 feet to 100 feet. The South Concourse is about 250 feet long along Stockton Street and another 100 feet as it wraps along Ellis Street. The depth ranges from about 20 to 30 feet as it ascends north.