WATERLINE PROTECTION IN A DOWNTOWN ELECTRIC RAIL CORRIDOR

摘要

The design criteria for an electric rail line servicing the center of downtown Portland, Oregon required "boot" type rail insulation and a 10-ft separation between the track slab and paralleling waterlines. Crossing waterlines were isolated with casings or sleeves for a 10-ft distance from the track slab. Where there was not adequate clearance for the specified separation between the track slab and neighboring waterlines, there were compromises to Portland Water Bureau's design standard and the track slab was additionally insulated with a secondary liner. This paper describes the design, construction, and field-testing of the track and waterlines.