With a total span of 145m, the overpass bridge crossing the Dali Creek (大里溪) in Taichung County will be the world's longest corrugated steel bridge once construction is completed next month, the National Expressway Engineering Bureau said yesterday.
Su Ying-hao (蘇英豪), director of the second district engineering office at the bureau's Taichung branch, said corrugated steel bridges are found mostly in Japan because they are relatively earthquake-resistant.
After the Dali bridge is completed, Japan's Shimoda and Nabeta bridges will be the second and third longest, at 135.6m and 125m respectively, the bureau said.
Su said the Dali bridge is the first corrugated steel bridge to be built in Taiwan.
“Rather than use 1m thick concrete slabs, we can use two 2cm thick corrugated steel slabs, which greatly reduces the weight of the bridge,” Su said. “We also don't have to install as many piers, which reduces the impact of water in the creek during the rain season.”
Su said the overpass bridge was part of the fourth line of the Taichung Life Circle (台中生活圈四號線), an expressway connecting the Taichung High Speed Rail Station to Jhongtou Highway (中投公路).
Su said the section of the Fourth Line between Songchu Road in Taichung City and the Wufeng Interchange on the Formosa Freeway (National Freeway No. 3) was scheduled to be completed by the end of next year. It is expected to reduce travel time from one hour to 15 minutes.