TRAVIS SPUR RAIL BRIDGE REPLACEMENT ABC TECHNIQUES IN A DESIGN BUILD PROJECT

摘要

One of the many challenges to be overcome during Goethals Bridge Replacement Project was the replacement of the existing Travis Spur Rail Bridge (TSRB), located near the east end of the project limits, and crossing over I-278 near the Goethals Bridge toll plaza. The original TSRB, consisting of a 7-span, single track crossing, was replaced to allow for widening of the I-278 corridor below. Due to operational needs of the owner, NYC Economic Development Corp, TSRB could only be removed from service for a single 60-hour weekend. Roll-in accelerated bridge construction techniques where thus required to replace the crossing. The crossing was replaced without closing I-278 to through traffic, except for a short 10-hour window for demolition of TSRB. The new TSRB consists of a ballasted, through girder design, supported on two-column bents, founded on drilled shafts. In order to make the weekend closure schedule, the two spans were erected within the project right-of-way, adjacent to the TSRB alignment while foundation work proceeded at the site. Drilled shafts and column were located to avoid existing substructure and utilities. Precast cap beams were installed during the weekend closure using a two-crane pick. The installation of the south pier cap beam was further complicated in that it had to be installed under the existing Gulf Avenue span to remain, while being installed over the rebar of the new pier columns. With the piers complete, the new spans were rolled into place, with ballast and track already in place, atop self-propelled mobile transporters (SPMTs).