Yi Sun-sin Bridge: A Challenging Method for Catwalk Erection

摘要

The Yi Sun-sin Bridge is a three-span continuous suspension bridge whose main span is 1545mrnlong. The construction of the bridge began in November of 2007 and the erection of the stiffeningrngirder was recently completed. In order to erect the main cable of the suspension bridge, temporaryrnstructures such as a catwalk and a hauling system need to be installed. Among these temporaryrnstructures, the construction of the catwalk is important and the catwalk rope should be erectedrnaccurately like the main cable as well, because the configuration of the catwalk affects the shape ofrnthe main cable. In this paper, the catwalk system of the Yi Sun-sin Bridge is introduced, includingrnthe erection method, equipment, and improvements. For the erection of the catwalk rope, thernadvanced free-hang method was used to enable container ships to pass during construction. Inrncomparison with the existing free-hang method, the improved method makes it possible to use thernsame hauling rope for the catwalk system and the air-spinning, thus reducing the risk andrnconstruction time.