Tunneling Uphill Through Tight DC Corridors

摘要

DC Water owns and maintains sanitary sewers in the District of Columbia. Four interceptors in this system, at the north end of the District, cross the western half of Rock Creek Park owned by the National Park Service. The objective of this project is to design, bid and build a replacement interceptor through the park to allow the abandonment of three deteriorated interceptors. The only option allowed by the Park Service was an alignment though the only paved roadway in the area – Bingham Drive. This new interceptor will also accommodate the future abandonment of other nearby interceptors that also run through stream valleys in the park.This paper details the design approach and construction methods used for eight trenchless installations of 24-inch interceptors, including a single 1,345-foot tunnel bore through rock, along narrow roadways, and congested utility corridors in a maturely-forested and high-end residential neighborhood, while complying with the sometimes-conflicting requirements of six jurisdictional agencies.