Accelerated Bridge Construction

The Utah Department of Transportation (UDOT) has used some form of the accelerated bridge construction (ABC) method on 19 projects that have included 77 bridges. The majority of these projects entailed the use of precast decks cast off-site and lifted into place over a short period of time—often overnight. The benefits of the ABC method include not only reduced road closure time and a compressed schedule, but enhanced quality and increased safety for drivers and construction workers as well. The concept of fabricating entire bridge spans off-site and moving them into place with self-propelled modular transports (SPMTs) was used in four projects that replaced a total of 13 bridges. The use of off-site fabrication and SPMTs usually allows for the replacement of bridge spans over a weekend. In one case—the 4500 South crossing of I-215 in Salt Lake City—construction time was reduced by 120 days, saving drivers an estimated $4.2 million in terms of construction delays.

Photos courtesy of Utah Department of Transportation.